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c609719b | 1 | # |
eca3aeb3 | 2 | # (C) Copyright 2000 - 2013 |
c609719b WD |
3 | # Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
4 | # | |
eca3aeb3 | 5 | # SPDX-License-Identifier: GPL-2.0+ |
c609719b WD |
6 | # |
7 | ||
8 | Summary: | |
9 | ======== | |
10 | ||
24ee89b9 | 11 | This directory contains the source code for U-Boot, a boot loader for |
e86e5a07 WD |
12 | Embedded boards based on PowerPC, ARM, MIPS and several other |
13 | processors, which can be installed in a boot ROM and used to | |
14 | initialize and test the hardware or to download and run application | |
15 | code. | |
c609719b WD |
16 | |
17 | The development of U-Boot is closely related to Linux: some parts of | |
24ee89b9 WD |
18 | the source code originate in the Linux source tree, we have some |
19 | header files in common, and special provision has been made to | |
c609719b WD |
20 | support booting of Linux images. |
21 | ||
22 | Some attention has been paid to make this software easily | |
23 | configurable and extendable. For instance, all monitor commands are | |
24 | implemented with the same call interface, so that it's very easy to | |
25 | add new commands. Also, instead of permanently adding rarely used | |
26 | code (for instance hardware test utilities) to the monitor, you can | |
27 | load and run it dynamically. | |
28 | ||
29 | ||
30 | Status: | |
31 | ======= | |
32 | ||
33 | In general, all boards for which a configuration option exists in the | |
24ee89b9 | 34 | Makefile have been tested to some extent and can be considered |
c609719b WD |
35 | "working". In fact, many of them are used in production systems. |
36 | ||
7207b366 RD |
37 | In case of problems see the CHANGELOG file to find out who contributed |
38 | the specific port. In addition, there are various MAINTAINERS files | |
39 | scattered throughout the U-Boot source identifying the people or | |
40 | companies responsible for various boards and subsystems. | |
c609719b | 41 | |
7207b366 RD |
42 | Note: As of August, 2010, there is no longer a CHANGELOG file in the |
43 | actual U-Boot source tree; however, it can be created dynamically | |
44 | from the Git log using: | |
adb9d851 RD |
45 | |
46 | make CHANGELOG | |
47 | ||
c609719b WD |
48 | |
49 | Where to get help: | |
50 | ================== | |
51 | ||
24ee89b9 | 52 | In case you have questions about, problems with or contributions for |
7207b366 | 53 | U-Boot, you should send a message to the U-Boot mailing list at |
0c32565f PT |
54 | <u-boot@lists.denx.de>. There is also an archive of previous traffic |
55 | on the mailing list - please search the archive before asking FAQ's. | |
56 | Please see http://lists.denx.de/pipermail/u-boot and | |
57 | http://dir.gmane.org/gmane.comp.boot-loaders.u-boot | |
c609719b WD |
58 | |
59 | ||
218ca724 WD |
60 | Where to get source code: |
61 | ========================= | |
62 | ||
7207b366 | 63 | The U-Boot source code is maintained in the Git repository at |
218ca724 WD |
64 | git://www.denx.de/git/u-boot.git ; you can browse it online at |
65 | http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary | |
66 | ||
67 | The "snapshot" links on this page allow you to download tarballs of | |
11ccc33f | 68 | any version you might be interested in. Official releases are also |
218ca724 WD |
69 | available for FTP download from the ftp://ftp.denx.de/pub/u-boot/ |
70 | directory. | |
71 | ||
d4ee711d | 72 | Pre-built (and tested) images are available from |
218ca724 WD |
73 | ftp://ftp.denx.de/pub/u-boot/images/ |
74 | ||
75 | ||
c609719b WD |
76 | Where we come from: |
77 | =================== | |
78 | ||
79 | - start from 8xxrom sources | |
24ee89b9 | 80 | - create PPCBoot project (http://sourceforge.net/projects/ppcboot) |
c609719b WD |
81 | - clean up code |
82 | - make it easier to add custom boards | |
83 | - make it possible to add other [PowerPC] CPUs | |
84 | - extend functions, especially: | |
85 | * Provide extended interface to Linux boot loader | |
86 | * S-Record download | |
87 | * network boot | |
11ccc33f | 88 | * PCMCIA / CompactFlash / ATA disk / SCSI ... boot |
24ee89b9 | 89 | - create ARMBoot project (http://sourceforge.net/projects/armboot) |
c609719b | 90 | - add other CPU families (starting with ARM) |
24ee89b9 | 91 | - create U-Boot project (http://sourceforge.net/projects/u-boot) |
0d28f34b | 92 | - current project page: see http://www.denx.de/wiki/U-Boot |
24ee89b9 WD |
93 | |
94 | ||
95 | Names and Spelling: | |
96 | =================== | |
97 | ||
98 | The "official" name of this project is "Das U-Boot". The spelling | |
99 | "U-Boot" shall be used in all written text (documentation, comments | |
100 | in source files etc.). Example: | |
101 | ||
102 | This is the README file for the U-Boot project. | |
103 | ||
104 | File names etc. shall be based on the string "u-boot". Examples: | |
105 | ||
106 | include/asm-ppc/u-boot.h | |
107 | ||
108 | #include <asm/u-boot.h> | |
109 | ||
110 | Variable names, preprocessor constants etc. shall be either based on | |
111 | the string "u_boot" or on "U_BOOT". Example: | |
112 | ||
113 | U_BOOT_VERSION u_boot_logo | |
114 | IH_OS_U_BOOT u_boot_hush_start | |
c609719b WD |
115 | |
116 | ||
93f19cc0 WD |
117 | Versioning: |
118 | =========== | |
119 | ||
360d883a TW |
120 | Starting with the release in October 2008, the names of the releases |
121 | were changed from numerical release numbers without deeper meaning | |
122 | into a time stamp based numbering. Regular releases are identified by | |
123 | names consisting of the calendar year and month of the release date. | |
124 | Additional fields (if present) indicate release candidates or bug fix | |
125 | releases in "stable" maintenance trees. | |
126 | ||
127 | Examples: | |
c0f40859 | 128 | U-Boot v2009.11 - Release November 2009 |
360d883a | 129 | U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree |
0de21ecb | 130 | U-Boot v2010.09-rc1 - Release candidate 1 for September 2010 release |
93f19cc0 WD |
131 | |
132 | ||
c609719b WD |
133 | Directory Hierarchy: |
134 | ==================== | |
135 | ||
8d321b81 | 136 | /arch Architecture specific files |
6eae68e4 | 137 | /arc Files generic to ARC architecture |
8d321b81 | 138 | /arm Files generic to ARM architecture |
8d321b81 | 139 | /m68k Files generic to m68k architecture |
8d321b81 | 140 | /microblaze Files generic to microblaze architecture |
8d321b81 | 141 | /mips Files generic to MIPS architecture |
afc1ce82 | 142 | /nds32 Files generic to NDS32 architecture |
8d321b81 | 143 | /nios2 Files generic to Altera NIOS2 architecture |
33c7731b | 144 | /openrisc Files generic to OpenRISC architecture |
a47a12be | 145 | /powerpc Files generic to PowerPC architecture |
3fafced7 | 146 | /riscv Files generic to RISC-V architecture |
7207b366 | 147 | /sandbox Files generic to HW-independent "sandbox" |
8d321b81 | 148 | /sh Files generic to SH architecture |
33c7731b | 149 | /x86 Files generic to x86 architecture |
8d321b81 PT |
150 | /api Machine/arch independent API for external apps |
151 | /board Board dependent files | |
740f7e5c | 152 | /cmd U-Boot commands functions |
8d321b81 | 153 | /common Misc architecture independent functions |
7207b366 | 154 | /configs Board default configuration files |
8d321b81 PT |
155 | /disk Code for disk drive partition handling |
156 | /doc Documentation (don't expect too much) | |
157 | /drivers Commonly used device drivers | |
33c7731b | 158 | /dts Contains Makefile for building internal U-Boot fdt. |
8d321b81 PT |
159 | /examples Example code for standalone applications, etc. |
160 | /fs Filesystem code (cramfs, ext2, jffs2, etc.) | |
161 | /include Header Files | |
7207b366 RD |
162 | /lib Library routines generic to all architectures |
163 | /Licenses Various license files | |
8d321b81 PT |
164 | /net Networking code |
165 | /post Power On Self Test | |
7207b366 RD |
166 | /scripts Various build scripts and Makefiles |
167 | /test Various unit test files | |
8d321b81 | 168 | /tools Tools to build S-Record or U-Boot images, etc. |
c609719b | 169 | |
c609719b WD |
170 | Software Configuration: |
171 | ======================= | |
172 | ||
173 | Configuration is usually done using C preprocessor defines; the | |
174 | rationale behind that is to avoid dead code whenever possible. | |
175 | ||
176 | There are two classes of configuration variables: | |
177 | ||
178 | * Configuration _OPTIONS_: | |
179 | These are selectable by the user and have names beginning with | |
180 | "CONFIG_". | |
181 | ||
182 | * Configuration _SETTINGS_: | |
183 | These depend on the hardware etc. and should not be meddled with if | |
184 | you don't know what you're doing; they have names beginning with | |
6d0f6bcf | 185 | "CONFIG_SYS_". |
c609719b | 186 | |
7207b366 RD |
187 | Previously, all configuration was done by hand, which involved creating |
188 | symbolic links and editing configuration files manually. More recently, | |
189 | U-Boot has added the Kbuild infrastructure used by the Linux kernel, | |
190 | allowing you to use the "make menuconfig" command to configure your | |
191 | build. | |
c609719b WD |
192 | |
193 | ||
194 | Selection of Processor Architecture and Board Type: | |
195 | --------------------------------------------------- | |
196 | ||
197 | For all supported boards there are ready-to-use default | |
ab584d67 | 198 | configurations available; just type "make <board_name>_defconfig". |
c609719b WD |
199 | |
200 | Example: For a TQM823L module type: | |
201 | ||
202 | cd u-boot | |
ab584d67 | 203 | make TQM823L_defconfig |
c609719b | 204 | |
7207b366 RD |
205 | Note: If you're looking for the default configuration file for a board |
206 | you're sure used to be there but is now missing, check the file | |
207 | doc/README.scrapyard for a list of no longer supported boards. | |
c609719b | 208 | |
75b3c3aa SG |
209 | Sandbox Environment: |
210 | -------------------- | |
211 | ||
212 | U-Boot can be built natively to run on a Linux host using the 'sandbox' | |
213 | board. This allows feature development which is not board- or architecture- | |
214 | specific to be undertaken on a native platform. The sandbox is also used to | |
215 | run some of U-Boot's tests. | |
216 | ||
6b1978f8 | 217 | See board/sandbox/README.sandbox for more details. |
75b3c3aa SG |
218 | |
219 | ||
db910353 SG |
220 | Board Initialisation Flow: |
221 | -------------------------- | |
222 | ||
223 | This is the intended start-up flow for boards. This should apply for both | |
7207b366 RD |
224 | SPL and U-Boot proper (i.e. they both follow the same rules). |
225 | ||
226 | Note: "SPL" stands for "Secondary Program Loader," which is explained in | |
227 | more detail later in this file. | |
228 | ||
229 | At present, SPL mostly uses a separate code path, but the function names | |
230 | and roles of each function are the same. Some boards or architectures | |
231 | may not conform to this. At least most ARM boards which use | |
232 | CONFIG_SPL_FRAMEWORK conform to this. | |
233 | ||
234 | Execution typically starts with an architecture-specific (and possibly | |
235 | CPU-specific) start.S file, such as: | |
236 | ||
237 | - arch/arm/cpu/armv7/start.S | |
238 | - arch/powerpc/cpu/mpc83xx/start.S | |
239 | - arch/mips/cpu/start.S | |
db910353 | 240 | |
7207b366 RD |
241 | and so on. From there, three functions are called; the purpose and |
242 | limitations of each of these functions are described below. | |
db910353 SG |
243 | |
244 | lowlevel_init(): | |
245 | - purpose: essential init to permit execution to reach board_init_f() | |
246 | - no global_data or BSS | |
247 | - there is no stack (ARMv7 may have one but it will soon be removed) | |
248 | - must not set up SDRAM or use console | |
249 | - must only do the bare minimum to allow execution to continue to | |
250 | board_init_f() | |
251 | - this is almost never needed | |
252 | - return normally from this function | |
253 | ||
254 | board_init_f(): | |
255 | - purpose: set up the machine ready for running board_init_r(): | |
256 | i.e. SDRAM and serial UART | |
257 | - global_data is available | |
258 | - stack is in SRAM | |
259 | - BSS is not available, so you cannot use global/static variables, | |
260 | only stack variables and global_data | |
261 | ||
262 | Non-SPL-specific notes: | |
263 | - dram_init() is called to set up DRAM. If already done in SPL this | |
264 | can do nothing | |
265 | ||
266 | SPL-specific notes: | |
267 | - you can override the entire board_init_f() function with your own | |
268 | version as needed. | |
269 | - preloader_console_init() can be called here in extremis | |
270 | - should set up SDRAM, and anything needed to make the UART work | |
271 | - these is no need to clear BSS, it will be done by crt0.S | |
272 | - must return normally from this function (don't call board_init_r() | |
273 | directly) | |
274 | ||
275 | Here the BSS is cleared. For SPL, if CONFIG_SPL_STACK_R is defined, then at | |
276 | this point the stack and global_data are relocated to below | |
277 | CONFIG_SPL_STACK_R_ADDR. For non-SPL, U-Boot is relocated to run at the top of | |
278 | memory. | |
279 | ||
280 | board_init_r(): | |
281 | - purpose: main execution, common code | |
282 | - global_data is available | |
283 | - SDRAM is available | |
284 | - BSS is available, all static/global variables can be used | |
285 | - execution eventually continues to main_loop() | |
286 | ||
287 | Non-SPL-specific notes: | |
288 | - U-Boot is relocated to the top of memory and is now running from | |
289 | there. | |
290 | ||
291 | SPL-specific notes: | |
292 | - stack is optionally in SDRAM, if CONFIG_SPL_STACK_R is defined and | |
293 | CONFIG_SPL_STACK_R_ADDR points into SDRAM | |
294 | - preloader_console_init() can be called here - typically this is | |
0680f1b1 | 295 | done by selecting CONFIG_SPL_BOARD_INIT and then supplying a |
db910353 SG |
296 | spl_board_init() function containing this call |
297 | - loads U-Boot or (in falcon mode) Linux | |
298 | ||
299 | ||
300 | ||
c609719b WD |
301 | Configuration Options: |
302 | ---------------------- | |
303 | ||
304 | Configuration depends on the combination of board and CPU type; all | |
305 | such information is kept in a configuration file | |
306 | "include/configs/<board_name>.h". | |
307 | ||
308 | Example: For a TQM823L module, all configuration settings are in | |
309 | "include/configs/TQM823L.h". | |
310 | ||
311 | ||
7f6c2cbc WD |
312 | Many of the options are named exactly as the corresponding Linux |
313 | kernel configuration options. The intention is to make it easier to | |
314 | build a config tool - later. | |
315 | ||
63b2316c AK |
316 | - ARM Platform Bus Type(CCI): |
317 | CoreLink Cache Coherent Interconnect (CCI) is ARM BUS which | |
318 | provides full cache coherency between two clusters of multi-core | |
319 | CPUs and I/O coherency for devices and I/O masters | |
320 | ||
321 | CONFIG_SYS_FSL_HAS_CCI400 | |
322 | ||
323 | Defined For SoC that has cache coherent interconnect | |
324 | CCN-400 | |
7f6c2cbc | 325 | |
c055cee1 AK |
326 | CONFIG_SYS_FSL_HAS_CCN504 |
327 | ||
328 | Defined for SoC that has cache coherent interconnect CCN-504 | |
329 | ||
c609719b WD |
330 | The following options need to be configured: |
331 | ||
2628114e KP |
332 | - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. |
333 | ||
334 | - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. | |
6ccec449 | 335 | |
cf946c6d LW |
336 | - Marvell Family Member |
337 | CONFIG_SYS_MVFS - define it if you want to enable | |
338 | multiple fs option at one time | |
339 | for marvell soc family | |
340 | ||
66412c63 | 341 | - 85xx CPU Options: |
ffd06e02 YS |
342 | CONFIG_SYS_PPC64 |
343 | ||
344 | Specifies that the core is a 64-bit PowerPC implementation (implements | |
345 | the "64" category of the Power ISA). This is necessary for ePAPR | |
346 | compliance, among other possible reasons. | |
347 | ||
66412c63 KG |
348 | CONFIG_SYS_FSL_TBCLK_DIV |
349 | ||
350 | Defines the core time base clock divider ratio compared to the | |
351 | system clock. On most PQ3 devices this is 8, on newer QorIQ | |
352 | devices it can be 16 or 32. The ratio varies from SoC to Soc. | |
353 | ||
8f29084a KG |
354 | CONFIG_SYS_FSL_PCIE_COMPAT |
355 | ||
356 | Defines the string to utilize when trying to match PCIe device | |
357 | tree nodes for the given platform. | |
358 | ||
33eee330 SW |
359 | CONFIG_SYS_FSL_ERRATUM_A004510 |
360 | ||
361 | Enables a workaround for erratum A004510. If set, | |
362 | then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and | |
363 | CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set. | |
364 | ||
365 | CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV | |
366 | CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional) | |
367 | ||
368 | Defines one or two SoC revisions (low 8 bits of SVR) | |
369 | for which the A004510 workaround should be applied. | |
370 | ||
371 | The rest of SVR is either not relevant to the decision | |
372 | of whether the erratum is present (e.g. p2040 versus | |
373 | p2041) or is implied by the build target, which controls | |
374 | whether CONFIG_SYS_FSL_ERRATUM_A004510 is set. | |
375 | ||
376 | See Freescale App Note 4493 for more information about | |
377 | this erratum. | |
378 | ||
74fa22ed PK |
379 | CONFIG_A003399_NOR_WORKAROUND |
380 | Enables a workaround for IFC erratum A003399. It is only | |
b445bbb4 | 381 | required during NOR boot. |
74fa22ed | 382 | |
9f074e67 PK |
383 | CONFIG_A008044_WORKAROUND |
384 | Enables a workaround for T1040/T1042 erratum A008044. It is only | |
b445bbb4 | 385 | required during NAND boot and valid for Rev 1.0 SoC revision |
9f074e67 | 386 | |
33eee330 SW |
387 | CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY |
388 | ||
389 | This is the value to write into CCSR offset 0x18600 | |
390 | according to the A004510 workaround. | |
391 | ||
64501c66 PJ |
392 | CONFIG_SYS_FSL_DSP_DDR_ADDR |
393 | This value denotes start offset of DDR memory which is | |
394 | connected exclusively to the DSP cores. | |
395 | ||
765b0bdb PJ |
396 | CONFIG_SYS_FSL_DSP_M2_RAM_ADDR |
397 | This value denotes start offset of M2 memory | |
398 | which is directly connected to the DSP core. | |
399 | ||
64501c66 PJ |
400 | CONFIG_SYS_FSL_DSP_M3_RAM_ADDR |
401 | This value denotes start offset of M3 memory which is directly | |
402 | connected to the DSP core. | |
403 | ||
765b0bdb PJ |
404 | CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT |
405 | This value denotes start offset of DSP CCSR space. | |
406 | ||
b135991a PJ |
407 | CONFIG_SYS_FSL_SINGLE_SOURCE_CLK |
408 | Single Source Clock is clocking mode present in some of FSL SoC's. | |
409 | In this mode, a single differential clock is used to supply | |
410 | clocks to the sysclock, ddrclock and usbclock. | |
411 | ||
fb4a2409 AB |
412 | CONFIG_SYS_CPC_REINIT_F |
413 | This CONFIG is defined when the CPC is configured as SRAM at the | |
a187559e | 414 | time of U-Boot entry and is required to be re-initialized. |
fb4a2409 | 415 | |
aade2004 | 416 | CONFIG_DEEP_SLEEP |
b445bbb4 | 417 | Indicates this SoC supports deep sleep feature. If deep sleep is |
aade2004 TY |
418 | supported, core will start to execute uboot when wakes up. |
419 | ||
6cb461b4 DS |
420 | - Generic CPU options: |
421 | CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN | |
422 | ||
423 | Defines the endianess of the CPU. Implementation of those | |
424 | values is arch specific. | |
425 | ||
5614e71b YS |
426 | CONFIG_SYS_FSL_DDR |
427 | Freescale DDR driver in use. This type of DDR controller is | |
428 | found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core | |
429 | SoCs. | |
430 | ||
431 | CONFIG_SYS_FSL_DDR_ADDR | |
432 | Freescale DDR memory-mapped register base. | |
433 | ||
434 | CONFIG_SYS_FSL_DDR_EMU | |
435 | Specify emulator support for DDR. Some DDR features such as | |
436 | deskew training are not available. | |
437 | ||
438 | CONFIG_SYS_FSL_DDRC_GEN1 | |
439 | Freescale DDR1 controller. | |
440 | ||
441 | CONFIG_SYS_FSL_DDRC_GEN2 | |
442 | Freescale DDR2 controller. | |
443 | ||
444 | CONFIG_SYS_FSL_DDRC_GEN3 | |
445 | Freescale DDR3 controller. | |
446 | ||
34e026f9 YS |
447 | CONFIG_SYS_FSL_DDRC_GEN4 |
448 | Freescale DDR4 controller. | |
449 | ||
9ac4ffbd YS |
450 | CONFIG_SYS_FSL_DDRC_ARM_GEN3 |
451 | Freescale DDR3 controller for ARM-based SoCs. | |
452 | ||
5614e71b YS |
453 | CONFIG_SYS_FSL_DDR1 |
454 | Board config to use DDR1. It can be enabled for SoCs with | |
455 | Freescale DDR1 or DDR2 controllers, depending on the board | |
456 | implemetation. | |
457 | ||
458 | CONFIG_SYS_FSL_DDR2 | |
62a3b7dd | 459 | Board config to use DDR2. It can be enabled for SoCs with |
5614e71b YS |
460 | Freescale DDR2 or DDR3 controllers, depending on the board |
461 | implementation. | |
462 | ||
463 | CONFIG_SYS_FSL_DDR3 | |
464 | Board config to use DDR3. It can be enabled for SoCs with | |
34e026f9 YS |
465 | Freescale DDR3 or DDR3L controllers. |
466 | ||
467 | CONFIG_SYS_FSL_DDR3L | |
468 | Board config to use DDR3L. It can be enabled for SoCs with | |
469 | DDR3L controllers. | |
470 | ||
471 | CONFIG_SYS_FSL_DDR4 | |
472 | Board config to use DDR4. It can be enabled for SoCs with | |
473 | DDR4 controllers. | |
5614e71b | 474 | |
1b4175d6 PK |
475 | CONFIG_SYS_FSL_IFC_BE |
476 | Defines the IFC controller register space as Big Endian | |
477 | ||
478 | CONFIG_SYS_FSL_IFC_LE | |
479 | Defines the IFC controller register space as Little Endian | |
480 | ||
1c40707e PK |
481 | CONFIG_SYS_FSL_IFC_CLK_DIV |
482 | Defines divider of platform clock(clock input to IFC controller). | |
483 | ||
add63f94 PK |
484 | CONFIG_SYS_FSL_LBC_CLK_DIV |
485 | Defines divider of platform clock(clock input to eLBC controller). | |
486 | ||
690e4258 PK |
487 | CONFIG_SYS_FSL_PBL_PBI |
488 | It enables addition of RCW (Power on reset configuration) in built image. | |
489 | Please refer doc/README.pblimage for more details | |
490 | ||
491 | CONFIG_SYS_FSL_PBL_RCW | |
492 | It adds PBI(pre-boot instructions) commands in u-boot build image. | |
493 | PBI commands can be used to configure SoC before it starts the execution. | |
494 | Please refer doc/README.pblimage for more details | |
495 | ||
89ad7be8 PK |
496 | CONFIG_SPL_FSL_PBL |
497 | It adds a target to create boot binary having SPL binary in PBI format | |
498 | concatenated with u-boot binary. | |
499 | ||
4e5b1bd0 YS |
500 | CONFIG_SYS_FSL_DDR_BE |
501 | Defines the DDR controller register space as Big Endian | |
502 | ||
503 | CONFIG_SYS_FSL_DDR_LE | |
504 | Defines the DDR controller register space as Little Endian | |
505 | ||
6b9e309a YS |
506 | CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY |
507 | Physical address from the view of DDR controllers. It is the | |
508 | same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But | |
509 | it could be different for ARM SoCs. | |
510 | ||
6b1e1254 YS |
511 | CONFIG_SYS_FSL_DDR_INTLV_256B |
512 | DDR controller interleaving on 256-byte. This is a special | |
513 | interleaving mode, handled by Dickens for Freescale layerscape | |
514 | SoCs with ARM core. | |
515 | ||
1d71efbb YS |
516 | CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS |
517 | Number of controllers used as main memory. | |
518 | ||
519 | CONFIG_SYS_FSL_OTHER_DDR_NUM_CTRLS | |
520 | Number of controllers used for other than main memory. | |
521 | ||
44937214 PK |
522 | CONFIG_SYS_FSL_HAS_DP_DDR |
523 | Defines the SoC has DP-DDR used for DPAA. | |
524 | ||
028dbb8d RG |
525 | CONFIG_SYS_FSL_SEC_BE |
526 | Defines the SEC controller register space as Big Endian | |
527 | ||
528 | CONFIG_SYS_FSL_SEC_LE | |
529 | Defines the SEC controller register space as Little Endian | |
530 | ||
92bbd64e DS |
531 | - MIPS CPU options: |
532 | CONFIG_SYS_INIT_SP_OFFSET | |
533 | ||
534 | Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack | |
535 | pointer. This is needed for the temporary stack before | |
536 | relocation. | |
537 | ||
538 | CONFIG_SYS_MIPS_CACHE_MODE | |
539 | ||
540 | Cache operation mode for the MIPS CPU. | |
541 | See also arch/mips/include/asm/mipsregs.h. | |
542 | Possible values are: | |
543 | CONF_CM_CACHABLE_NO_WA | |
544 | CONF_CM_CACHABLE_WA | |
545 | CONF_CM_UNCACHED | |
546 | CONF_CM_CACHABLE_NONCOHERENT | |
547 | CONF_CM_CACHABLE_CE | |
548 | CONF_CM_CACHABLE_COW | |
549 | CONF_CM_CACHABLE_CUW | |
550 | CONF_CM_CACHABLE_ACCELERATED | |
551 | ||
552 | CONFIG_SYS_XWAY_EBU_BOOTCFG | |
553 | ||
554 | Special option for Lantiq XWAY SoCs for booting from NOR flash. | |
555 | See also arch/mips/cpu/mips32/start.S. | |
556 | ||
557 | CONFIG_XWAY_SWAP_BYTES | |
558 | ||
559 | Enable compilation of tools/xway-swap-bytes needed for Lantiq | |
560 | XWAY SoCs for booting from NOR flash. The U-Boot image needs to | |
561 | be swapped if a flash programmer is used. | |
562 | ||
b67d8816 CR |
563 | - ARM options: |
564 | CONFIG_SYS_EXCEPTION_VECTORS_HIGH | |
565 | ||
566 | Select high exception vectors of the ARM core, e.g., do not | |
567 | clear the V bit of the c1 register of CP15. | |
568 | ||
207774b2 YS |
569 | COUNTER_FREQUENCY |
570 | Generic timer clock source frequency. | |
571 | ||
572 | COUNTER_FREQUENCY_REAL | |
573 | Generic timer clock source frequency if the real clock is | |
574 | different from COUNTER_FREQUENCY, and can only be determined | |
575 | at run time. | |
576 | ||
73c38934 SW |
577 | - Tegra SoC options: |
578 | CONFIG_TEGRA_SUPPORT_NON_SECURE | |
579 | ||
580 | Support executing U-Boot in non-secure (NS) mode. Certain | |
581 | impossible actions will be skipped if the CPU is in NS mode, | |
582 | such as ARM architectural timer initialization. | |
583 | ||
5da627a4 | 584 | - Linux Kernel Interface: |
c609719b WD |
585 | CONFIG_CLOCKS_IN_MHZ |
586 | ||
587 | U-Boot stores all clock information in Hz | |
588 | internally. For binary compatibility with older Linux | |
589 | kernels (which expect the clocks passed in the | |
590 | bd_info data to be in MHz) the environment variable | |
591 | "clocks_in_mhz" can be defined so that U-Boot | |
592 | converts clock data to MHZ before passing it to the | |
593 | Linux kernel. | |
c609719b | 594 | When CONFIG_CLOCKS_IN_MHZ is defined, a definition of |
218ca724 | 595 | "clocks_in_mhz=1" is automatically included in the |
c609719b WD |
596 | default environment. |
597 | ||
5da627a4 WD |
598 | CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] |
599 | ||
b445bbb4 | 600 | When transferring memsize parameter to Linux, some versions |
5da627a4 WD |
601 | expect it to be in bytes, others in MB. |
602 | Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. | |
603 | ||
fec6d9ee | 604 | CONFIG_OF_LIBFDT |
f57f70aa WD |
605 | |
606 | New kernel versions are expecting firmware settings to be | |
213bf8c8 GVB |
607 | passed using flattened device trees (based on open firmware |
608 | concepts). | |
609 | ||
610 | CONFIG_OF_LIBFDT | |
611 | * New libfdt-based support | |
612 | * Adds the "fdt" command | |
3bb342fc | 613 | * The bootm command automatically updates the fdt |
213bf8c8 | 614 | |
f57f70aa | 615 | OF_TBCLK - The timebase frequency. |
c2871f03 | 616 | OF_STDOUT_PATH - The path to the console device |
f57f70aa | 617 | |
11ccc33f MZ |
618 | boards with QUICC Engines require OF_QE to set UCC MAC |
619 | addresses | |
3bb342fc | 620 | |
4e253137 KG |
621 | CONFIG_OF_BOARD_SETUP |
622 | ||
623 | Board code has addition modification that it wants to make | |
624 | to the flat device tree before handing it off to the kernel | |
f57f70aa | 625 | |
c654b517 SG |
626 | CONFIG_OF_SYSTEM_SETUP |
627 | ||
628 | Other code has addition modification that it wants to make | |
629 | to the flat device tree before handing it off to the kernel. | |
630 | This causes ft_system_setup() to be called before booting | |
631 | the kernel. | |
632 | ||
3887c3fb HS |
633 | CONFIG_OF_IDE_FIXUP |
634 | ||
635 | U-Boot can detect if an IDE device is present or not. | |
636 | If not, and this new config option is activated, U-Boot | |
637 | removes the ATA node from the DTS before booting Linux, | |
638 | so the Linux IDE driver does not probe the device and | |
639 | crash. This is needed for buggy hardware (uc101) where | |
640 | no pull down resistor is connected to the signal IDE5V_DD7. | |
641 | ||
7eb29398 IG |
642 | CONFIG_MACH_TYPE [relevant for ARM only][mandatory] |
643 | ||
644 | This setting is mandatory for all boards that have only one | |
645 | machine type and must be used to specify the machine type | |
646 | number as it appears in the ARM machine registry | |
647 | (see http://www.arm.linux.org.uk/developer/machines/). | |
648 | Only boards that have multiple machine types supported | |
649 | in a single configuration file and the machine type is | |
650 | runtime discoverable, do not have to use this setting. | |
651 | ||
0b2f4eca NG |
652 | - vxWorks boot parameters: |
653 | ||
654 | bootvx constructs a valid bootline using the following | |
9e98b7e3 BM |
655 | environments variables: bootdev, bootfile, ipaddr, netmask, |
656 | serverip, gatewayip, hostname, othbootargs. | |
0b2f4eca NG |
657 | It loads the vxWorks image pointed bootfile. |
658 | ||
0b2f4eca NG |
659 | Note: If a "bootargs" environment is defined, it will overwride |
660 | the defaults discussed just above. | |
661 | ||
2c451f78 A |
662 | - Cache Configuration: |
663 | CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot | |
664 | CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot | |
665 | CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot | |
666 | ||
93bc2193 A |
667 | - Cache Configuration for ARM: |
668 | CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache | |
669 | controller | |
670 | CONFIG_SYS_PL310_BASE - Physical base address of PL310 | |
671 | controller register space | |
672 | ||
6705d81e | 673 | - Serial Ports: |
48d0192f | 674 | CONFIG_PL010_SERIAL |
6705d81e WD |
675 | |
676 | Define this if you want support for Amba PrimeCell PL010 UARTs. | |
677 | ||
48d0192f | 678 | CONFIG_PL011_SERIAL |
6705d81e WD |
679 | |
680 | Define this if you want support for Amba PrimeCell PL011 UARTs. | |
681 | ||
682 | CONFIG_PL011_CLOCK | |
683 | ||
684 | If you have Amba PrimeCell PL011 UARTs, set this variable to | |
685 | the clock speed of the UARTs. | |
686 | ||
687 | CONFIG_PL01x_PORTS | |
688 | ||
689 | If you have Amba PrimeCell PL010 or PL011 UARTs on your board, | |
690 | define this to a list of base addresses for each (supported) | |
691 | port. See e.g. include/configs/versatile.h | |
692 | ||
d57dee57 KM |
693 | CONFIG_SERIAL_HW_FLOW_CONTROL |
694 | ||
695 | Define this variable to enable hw flow control in serial driver. | |
696 | Current user of this option is drivers/serial/nsl16550.c driver | |
6705d81e | 697 | |
c609719b WD |
698 | - Console Baudrate: |
699 | CONFIG_BAUDRATE - in bps | |
700 | Select one of the baudrates listed in | |
6d0f6bcf | 701 | CONFIG_SYS_BAUDRATE_TABLE, see below. |
c609719b | 702 | |
c609719b WD |
703 | - Autoboot Command: |
704 | CONFIG_BOOTCOMMAND | |
705 | Only needed when CONFIG_BOOTDELAY is enabled; | |
706 | define a command string that is automatically executed | |
707 | when no character is read on the console interface | |
708 | within "Boot Delay" after reset. | |
709 | ||
c609719b | 710 | CONFIG_RAMBOOT and CONFIG_NFSBOOT |
43d9616c WD |
711 | The value of these goes into the environment as |
712 | "ramboot" and "nfsboot" respectively, and can be used | |
713 | as a convenience, when switching between booting from | |
11ccc33f | 714 | RAM and NFS. |
c609719b WD |
715 | |
716 | - Pre-Boot Commands: | |
717 | CONFIG_PREBOOT | |
718 | ||
719 | When this option is #defined, the existence of the | |
720 | environment variable "preboot" will be checked | |
721 | immediately before starting the CONFIG_BOOTDELAY | |
722 | countdown and/or running the auto-boot command resp. | |
723 | entering interactive mode. | |
724 | ||
725 | This feature is especially useful when "preboot" is | |
726 | automatically generated or modified. For an example | |
727 | see the LWMON board specific code: here "preboot" is | |
728 | modified when the user holds down a certain | |
729 | combination of keys on the (special) keyboard when | |
730 | booting the systems | |
731 | ||
732 | - Serial Download Echo Mode: | |
733 | CONFIG_LOADS_ECHO | |
734 | If defined to 1, all characters received during a | |
735 | serial download (using the "loads" command) are | |
736 | echoed back. This might be needed by some terminal | |
737 | emulations (like "cu"), but may as well just take | |
738 | time on others. This setting #define's the initial | |
739 | value of the "loads_echo" environment variable. | |
740 | ||
602ad3b3 | 741 | - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) |
c609719b WD |
742 | CONFIG_KGDB_BAUDRATE |
743 | Select one of the baudrates listed in | |
6d0f6bcf | 744 | CONFIG_SYS_BAUDRATE_TABLE, see below. |
c609719b | 745 | |
302a6487 SG |
746 | - Removal of commands |
747 | If no commands are needed to boot, you can disable | |
748 | CONFIG_CMDLINE to remove them. In this case, the command line | |
749 | will not be available, and when U-Boot wants to execute the | |
750 | boot command (on start-up) it will call board_run_command() | |
751 | instead. This can reduce image size significantly for very | |
752 | simple boot procedures. | |
753 | ||
a5ecbe62 WD |
754 | - Regular expression support: |
755 | CONFIG_REGEX | |
93e14596 WD |
756 | If this variable is defined, U-Boot is linked against |
757 | the SLRE (Super Light Regular Expression) library, | |
758 | which adds regex support to some commands, as for | |
759 | example "env grep" and "setexpr". | |
a5ecbe62 | 760 | |
45ba8077 SG |
761 | - Device tree: |
762 | CONFIG_OF_CONTROL | |
763 | If this variable is defined, U-Boot will use a device tree | |
764 | to configure its devices, instead of relying on statically | |
765 | compiled #defines in the board file. This option is | |
766 | experimental and only available on a few boards. The device | |
767 | tree is available in the global data as gd->fdt_blob. | |
768 | ||
2c0f79e4 | 769 | U-Boot needs to get its device tree from somewhere. This can |
82f766d1 | 770 | be done using one of the three options below: |
bbb0b128 SG |
771 | |
772 | CONFIG_OF_EMBED | |
773 | If this variable is defined, U-Boot will embed a device tree | |
774 | binary in its image. This device tree file should be in the | |
775 | board directory and called <soc>-<board>.dts. The binary file | |
776 | is then picked up in board_init_f() and made available through | |
eb3eb602 | 777 | the global data structure as gd->fdt_blob. |
45ba8077 | 778 | |
2c0f79e4 SG |
779 | CONFIG_OF_SEPARATE |
780 | If this variable is defined, U-Boot will build a device tree | |
781 | binary. It will be called u-boot.dtb. Architecture-specific | |
782 | code will locate it at run-time. Generally this works by: | |
783 | ||
784 | cat u-boot.bin u-boot.dtb >image.bin | |
785 | ||
786 | and in fact, U-Boot does this for you, creating a file called | |
787 | u-boot-dtb.bin which is useful in the common case. You can | |
788 | still use the individual files if you need something more | |
789 | exotic. | |
790 | ||
82f766d1 AD |
791 | CONFIG_OF_BOARD |
792 | If this variable is defined, U-Boot will use the device tree | |
793 | provided by the board at runtime instead of embedding one with | |
794 | the image. Only boards defining board_fdt_blob_setup() support | |
795 | this option (see include/fdtdec.h file). | |
796 | ||
c609719b WD |
797 | - Watchdog: |
798 | CONFIG_WATCHDOG | |
799 | If this variable is defined, it enables watchdog | |
6abe6fb6 | 800 | support for the SoC. There must be support in the SoC |
907208c4 CL |
801 | specific code for a watchdog. For the 8xx |
802 | CPUs, the SIU Watchdog feature is enabled in the SYPCR | |
803 | register. When supported for a specific SoC is | |
804 | available, then no further board specific code should | |
805 | be needed to use it. | |
6abe6fb6 DZ |
806 | |
807 | CONFIG_HW_WATCHDOG | |
808 | When using a watchdog circuitry external to the used | |
809 | SoC, then define this variable and provide board | |
810 | specific code for the "hw_watchdog_reset" function. | |
c609719b | 811 | |
7bae0d6f HS |
812 | CONFIG_AT91_HW_WDT_TIMEOUT |
813 | specify the timeout in seconds. default 2 seconds. | |
814 | ||
c1551ea8 SR |
815 | - U-Boot Version: |
816 | CONFIG_VERSION_VARIABLE | |
817 | If this variable is defined, an environment variable | |
818 | named "ver" is created by U-Boot showing the U-Boot | |
819 | version as printed by the "version" command. | |
a1ea8e51 BT |
820 | Any change to this variable will be reverted at the |
821 | next reset. | |
c1551ea8 | 822 | |
c609719b WD |
823 | - Real-Time Clock: |
824 | ||
602ad3b3 | 825 | When CONFIG_CMD_DATE is selected, the type of the RTC |
c609719b WD |
826 | has to be selected, too. Define exactly one of the |
827 | following options: | |
828 | ||
c609719b | 829 | CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC |
4e8b7544 | 830 | CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC |
c609719b | 831 | CONFIG_RTC_MC146818 - use MC146818 RTC |
1cb8e980 | 832 | CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC |
c609719b | 833 | CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC |
7f70e853 | 834 | CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC |
412921d2 | 835 | CONFIG_RTC_DS1339 - use Maxim, Inc. DS1339 RTC |
3bac3513 | 836 | CONFIG_RTC_DS164x - use Dallas DS164x RTC |
9536dfcc | 837 | CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC |
4c0d4c3b | 838 | CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC |
2bd3cab3 | 839 | CONFIG_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 |
71d19f30 HS |
840 | CONFIG_SYS_RV3029_TCR - enable trickle charger on |
841 | RV3029 RTC. | |
c609719b | 842 | |
b37c7e5e WD |
843 | Note that if the RTC uses I2C, then the I2C interface |
844 | must also be configured. See I2C Support, below. | |
845 | ||
e92739d3 PT |
846 | - GPIO Support: |
847 | CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO | |
e92739d3 | 848 | |
5dec49ca CP |
849 | The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of |
850 | chip-ngpio pairs that tell the PCA953X driver the number of | |
851 | pins supported by a particular chip. | |
852 | ||
e92739d3 PT |
853 | Note that if the GPIO device uses I2C, then the I2C interface |
854 | must also be configured. See I2C Support, below. | |
855 | ||
aa53233a SG |
856 | - I/O tracing: |
857 | When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O | |
858 | accesses and can checksum them or write a list of them out | |
859 | to memory. See the 'iotrace' command for details. This is | |
860 | useful for testing device drivers since it can confirm that | |
861 | the driver behaves the same way before and after a code | |
862 | change. Currently this is supported on sandbox and arm. To | |
863 | add support for your architecture, add '#include <iotrace.h>' | |
864 | to the bottom of arch/<arch>/include/asm/io.h and test. | |
865 | ||
866 | Example output from the 'iotrace stats' command is below. | |
867 | Note that if the trace buffer is exhausted, the checksum will | |
868 | still continue to operate. | |
869 | ||
870 | iotrace is enabled | |
871 | Start: 10000000 (buffer start address) | |
872 | Size: 00010000 (buffer size) | |
873 | Offset: 00000120 (current buffer offset) | |
874 | Output: 10000120 (start + offset) | |
875 | Count: 00000018 (number of trace records) | |
876 | CRC32: 9526fb66 (CRC32 of all trace records) | |
877 | ||
c609719b WD |
878 | - Timestamp Support: |
879 | ||
43d9616c WD |
880 | When CONFIG_TIMESTAMP is selected, the timestamp |
881 | (date and time) of an image is printed by image | |
882 | commands like bootm or iminfo. This option is | |
602ad3b3 | 883 | automatically enabled when you select CONFIG_CMD_DATE . |
c609719b | 884 | |
923c46f9 KP |
885 | - Partition Labels (disklabels) Supported: |
886 | Zero or more of the following: | |
887 | CONFIG_MAC_PARTITION Apple's MacOS partition table. | |
923c46f9 KP |
888 | CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc. |
889 | CONFIG_EFI_PARTITION GPT partition table, common when EFI is the | |
890 | bootloader. Note 2TB partition limit; see | |
891 | disk/part_efi.c | |
892 | CONFIG_MTD_PARTITIONS Memory Technology Device partition table. | |
c609719b | 893 | |
fc843a02 | 894 | If IDE or SCSI support is enabled (CONFIG_IDE or |
c649e3c9 | 895 | CONFIG_SCSI) you must configure support for at |
923c46f9 | 896 | least one non-MTD partition type as well. |
c609719b WD |
897 | |
898 | - IDE Reset method: | |
4d13cbad WD |
899 | CONFIG_IDE_RESET_ROUTINE - this is defined in several |
900 | board configurations files but used nowhere! | |
c609719b | 901 | |
4d13cbad WD |
902 | CONFIG_IDE_RESET - is this is defined, IDE Reset will |
903 | be performed by calling the function | |
904 | ide_set_reset(int reset) | |
905 | which has to be defined in a board specific file | |
c609719b WD |
906 | |
907 | - ATAPI Support: | |
908 | CONFIG_ATAPI | |
909 | ||
910 | Set this to enable ATAPI support. | |
911 | ||
c40b2956 WD |
912 | - LBA48 Support |
913 | CONFIG_LBA48 | |
914 | ||
915 | Set this to enable support for disks larger than 137GB | |
4b142feb | 916 | Also look at CONFIG_SYS_64BIT_LBA. |
c40b2956 WD |
917 | Whithout these , LBA48 support uses 32bit variables and will 'only' |
918 | support disks up to 2.1TB. | |
919 | ||
6d0f6bcf | 920 | CONFIG_SYS_64BIT_LBA: |
c40b2956 WD |
921 | When enabled, makes the IDE subsystem use 64bit sector addresses. |
922 | Default is 32bit. | |
923 | ||
c609719b | 924 | - SCSI Support: |
6d0f6bcf JCPV |
925 | CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and |
926 | CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * | |
927 | CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the | |
c609719b WD |
928 | maximum numbers of LUNs, SCSI ID's and target |
929 | devices. | |
c609719b | 930 | |
93e14596 WD |
931 | The environment variable 'scsidevs' is set to the number of |
932 | SCSI devices found during the last scan. | |
447c031b | 933 | |
c609719b | 934 | - NETWORK Support (PCI): |
682011ff | 935 | CONFIG_E1000 |
ce5207e1 KM |
936 | Support for Intel 8254x/8257x gigabit chips. |
937 | ||
938 | CONFIG_E1000_SPI | |
939 | Utility code for direct access to the SPI bus on Intel 8257x. | |
940 | This does not do anything useful unless you set at least one | |
941 | of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC. | |
942 | ||
943 | CONFIG_E1000_SPI_GENERIC | |
944 | Allow generic access to the SPI bus on the Intel 8257x, for | |
945 | example with the "sspi" command. | |
946 | ||
c609719b WD |
947 | CONFIG_EEPRO100 |
948 | Support for Intel 82557/82559/82559ER chips. | |
11ccc33f | 949 | Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM |
c609719b WD |
950 | write routine for first time initialisation. |
951 | ||
952 | CONFIG_TULIP | |
953 | Support for Digital 2114x chips. | |
954 | Optional CONFIG_TULIP_SELECT_MEDIA for board specific | |
955 | modem chip initialisation (KS8761/QS6611). | |
956 | ||
957 | CONFIG_NATSEMI | |
958 | Support for National dp83815 chips. | |
959 | ||
960 | CONFIG_NS8382X | |
961 | Support for National dp8382[01] gigabit chips. | |
962 | ||
45219c46 WD |
963 | - NETWORK Support (other): |
964 | ||
c041e9d2 JS |
965 | CONFIG_DRIVER_AT91EMAC |
966 | Support for AT91RM9200 EMAC. | |
967 | ||
968 | CONFIG_RMII | |
969 | Define this to use reduced MII inteface | |
970 | ||
971 | CONFIG_DRIVER_AT91EMAC_QUIET | |
972 | If this defined, the driver is quiet. | |
973 | The driver doen't show link status messages. | |
974 | ||
efdd7319 RH |
975 | CONFIG_CALXEDA_XGMAC |
976 | Support for the Calxeda XGMAC device | |
977 | ||
3bb46d23 | 978 | CONFIG_LAN91C96 |
45219c46 WD |
979 | Support for SMSC's LAN91C96 chips. |
980 | ||
45219c46 WD |
981 | CONFIG_LAN91C96_USE_32_BIT |
982 | Define this to enable 32 bit addressing | |
983 | ||
3bb46d23 | 984 | CONFIG_SMC91111 |
f39748ae WD |
985 | Support for SMSC's LAN91C111 chip |
986 | ||
987 | CONFIG_SMC91111_BASE | |
988 | Define this to hold the physical address | |
989 | of the device (I/O space) | |
990 | ||
991 | CONFIG_SMC_USE_32_BIT | |
992 | Define this if data bus is 32 bits | |
993 | ||
994 | CONFIG_SMC_USE_IOFUNCS | |
995 | Define this to use i/o functions instead of macros | |
996 | (some hardware wont work with macros) | |
997 | ||
dc02bada HS |
998 | CONFIG_DRIVER_TI_EMAC |
999 | Support for davinci emac | |
1000 | ||
1001 | CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT | |
1002 | Define this if you have more then 3 PHYs. | |
1003 | ||
b3dbf4a5 ML |
1004 | CONFIG_FTGMAC100 |
1005 | Support for Faraday's FTGMAC100 Gigabit SoC Ethernet | |
1006 | ||
1007 | CONFIG_FTGMAC100_EGIGA | |
1008 | Define this to use GE link update with gigabit PHY. | |
1009 | Define this if FTGMAC100 is connected to gigabit PHY. | |
1010 | If your system has 10/100 PHY only, it might not occur | |
1011 | wrong behavior. Because PHY usually return timeout or | |
1012 | useless data when polling gigabit status and gigabit | |
1013 | control registers. This behavior won't affect the | |
1014 | correctnessof 10/100 link speed update. | |
1015 | ||
3d0075fa YS |
1016 | CONFIG_SH_ETHER |
1017 | Support for Renesas on-chip Ethernet controller | |
1018 | ||
1019 | CONFIG_SH_ETHER_USE_PORT | |
1020 | Define the number of ports to be used | |
1021 | ||
1022 | CONFIG_SH_ETHER_PHY_ADDR | |
1023 | Define the ETH PHY's address | |
1024 | ||
68260aab YS |
1025 | CONFIG_SH_ETHER_CACHE_WRITEBACK |
1026 | If this option is set, the driver enables cache flush. | |
1027 | ||
b2f97cf2 HS |
1028 | - PWM Support: |
1029 | CONFIG_PWM_IMX | |
5052e819 | 1030 | Support for PWM module on the imx6. |
b2f97cf2 | 1031 | |
5e124724 | 1032 | - TPM Support: |
90899cc0 CC |
1033 | CONFIG_TPM |
1034 | Support TPM devices. | |
1035 | ||
0766ad2f CR |
1036 | CONFIG_TPM_TIS_INFINEON |
1037 | Support for Infineon i2c bus TPM devices. Only one device | |
1b393db5 TWHT |
1038 | per system is supported at this time. |
1039 | ||
1b393db5 TWHT |
1040 | CONFIG_TPM_TIS_I2C_BURST_LIMITATION |
1041 | Define the burst count bytes upper limit | |
1042 | ||
3aa74088 CR |
1043 | CONFIG_TPM_ST33ZP24 |
1044 | Support for STMicroelectronics TPM devices. Requires DM_TPM support. | |
1045 | ||
1046 | CONFIG_TPM_ST33ZP24_I2C | |
1047 | Support for STMicroelectronics ST33ZP24 I2C devices. | |
1048 | Requires TPM_ST33ZP24 and I2C. | |
1049 | ||
b75fdc11 CR |
1050 | CONFIG_TPM_ST33ZP24_SPI |
1051 | Support for STMicroelectronics ST33ZP24 SPI devices. | |
1052 | Requires TPM_ST33ZP24 and SPI. | |
1053 | ||
c01939c7 DE |
1054 | CONFIG_TPM_ATMEL_TWI |
1055 | Support for Atmel TWI TPM device. Requires I2C support. | |
1056 | ||
90899cc0 | 1057 | CONFIG_TPM_TIS_LPC |
5e124724 VB |
1058 | Support for generic parallel port TPM devices. Only one device |
1059 | per system is supported at this time. | |
1060 | ||
1061 | CONFIG_TPM_TIS_BASE_ADDRESS | |
1062 | Base address where the generic TPM device is mapped | |
1063 | to. Contemporary x86 systems usually map it at | |
1064 | 0xfed40000. | |
1065 | ||
be6c1529 RP |
1066 | CONFIG_TPM |
1067 | Define this to enable the TPM support library which provides | |
1068 | functional interfaces to some TPM commands. | |
1069 | Requires support for a TPM device. | |
1070 | ||
1071 | CONFIG_TPM_AUTH_SESSIONS | |
1072 | Define this to enable authorized functions in the TPM library. | |
1073 | Requires CONFIG_TPM and CONFIG_SHA1. | |
1074 | ||
c609719b WD |
1075 | - USB Support: |
1076 | At the moment only the UHCI host controller is | |
064b55cf | 1077 | supported (PIP405, MIP405); define |
c609719b WD |
1078 | CONFIG_USB_UHCI to enable it. |
1079 | define CONFIG_USB_KEYBOARD to enable the USB Keyboard | |
30d56fae | 1080 | and define CONFIG_USB_STORAGE to enable the USB |
c609719b WD |
1081 | storage devices. |
1082 | Note: | |
1083 | Supported are USB Keyboards and USB Floppy drives | |
1084 | (TEAC FD-05PUB). | |
4d13cbad | 1085 | |
9ab4ce22 SG |
1086 | CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the |
1087 | txfilltuning field in the EHCI controller on reset. | |
1088 | ||
6e9e0626 OT |
1089 | CONFIG_USB_DWC2_REG_ADDR the physical CPU address of the DWC2 |
1090 | HW module registers. | |
1091 | ||
16c8d5e7 WD |
1092 | - USB Device: |
1093 | Define the below if you wish to use the USB console. | |
1094 | Once firmware is rebuilt from a serial console issue the | |
1095 | command "setenv stdin usbtty; setenv stdout usbtty" and | |
11ccc33f | 1096 | attach your USB cable. The Unix command "dmesg" should print |
16c8d5e7 WD |
1097 | it has found a new device. The environment variable usbtty |
1098 | can be set to gserial or cdc_acm to enable your device to | |
386eda02 | 1099 | appear to a USB host as a Linux gserial device or a |
16c8d5e7 WD |
1100 | Common Device Class Abstract Control Model serial device. |
1101 | If you select usbtty = gserial you should be able to enumerate | |
1102 | a Linux host by | |
1103 | # modprobe usbserial vendor=0xVendorID product=0xProductID | |
1104 | else if using cdc_acm, simply setting the environment | |
1105 | variable usbtty to be cdc_acm should suffice. The following | |
1106 | might be defined in YourBoardName.h | |
386eda02 | 1107 | |
16c8d5e7 WD |
1108 | CONFIG_USB_DEVICE |
1109 | Define this to build a UDC device | |
1110 | ||
1111 | CONFIG_USB_TTY | |
1112 | Define this to have a tty type of device available to | |
1113 | talk to the UDC device | |
386eda02 | 1114 | |
f9da0f89 VK |
1115 | CONFIG_USBD_HS |
1116 | Define this to enable the high speed support for usb | |
1117 | device and usbtty. If this feature is enabled, a routine | |
1118 | int is_usbd_high_speed(void) | |
1119 | also needs to be defined by the driver to dynamically poll | |
1120 | whether the enumeration has succeded at high speed or full | |
1121 | speed. | |
1122 | ||
6d0f6bcf | 1123 | CONFIG_SYS_CONSOLE_IS_IN_ENV |
16c8d5e7 WD |
1124 | Define this if you want stdin, stdout &/or stderr to |
1125 | be set to usbtty. | |
1126 | ||
386eda02 | 1127 | If you have a USB-IF assigned VendorID then you may wish to |
16c8d5e7 | 1128 | define your own vendor specific values either in BoardName.h |
386eda02 | 1129 | or directly in usbd_vendor_info.h. If you don't define |
16c8d5e7 WD |
1130 | CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, |
1131 | CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot | |
1132 | should pretend to be a Linux device to it's target host. | |
1133 | ||
1134 | CONFIG_USBD_MANUFACTURER | |
1135 | Define this string as the name of your company for | |
1136 | - CONFIG_USBD_MANUFACTURER "my company" | |
386eda02 | 1137 | |
16c8d5e7 WD |
1138 | CONFIG_USBD_PRODUCT_NAME |
1139 | Define this string as the name of your product | |
1140 | - CONFIG_USBD_PRODUCT_NAME "acme usb device" | |
1141 | ||
1142 | CONFIG_USBD_VENDORID | |
1143 | Define this as your assigned Vendor ID from the USB | |
1144 | Implementors Forum. This *must* be a genuine Vendor ID | |
1145 | to avoid polluting the USB namespace. | |
1146 | - CONFIG_USBD_VENDORID 0xFFFF | |
386eda02 | 1147 | |
16c8d5e7 WD |
1148 | CONFIG_USBD_PRODUCTID |
1149 | Define this as the unique Product ID | |
1150 | for your device | |
1151 | - CONFIG_USBD_PRODUCTID 0xFFFF | |
4d13cbad | 1152 | |
d70a560f IG |
1153 | - ULPI Layer Support: |
1154 | The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via | |
1155 | the generic ULPI layer. The generic layer accesses the ULPI PHY | |
1156 | via the platform viewport, so you need both the genric layer and | |
1157 | the viewport enabled. Currently only Chipidea/ARC based | |
1158 | viewport is supported. | |
1159 | To enable the ULPI layer support, define CONFIG_USB_ULPI and | |
1160 | CONFIG_USB_ULPI_VIEWPORT in your board configuration file. | |
6d365ea0 LS |
1161 | If your ULPI phy needs a different reference clock than the |
1162 | standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to | |
1163 | the appropriate value in Hz. | |
c609719b | 1164 | |
71f95118 | 1165 | - MMC Support: |
8bde7f77 WD |
1166 | The MMC controller on the Intel PXA is supported. To |
1167 | enable this define CONFIG_MMC. The MMC can be | |
1168 | accessed from the boot prompt by mapping the device | |
71f95118 | 1169 | to physical memory similar to flash. Command line is |
602ad3b3 JL |
1170 | enabled with CONFIG_CMD_MMC. The MMC driver also works with |
1171 | the FAT fs. This is enabled with CONFIG_CMD_FAT. | |
71f95118 | 1172 | |
afb35666 YS |
1173 | CONFIG_SH_MMCIF |
1174 | Support for Renesas on-chip MMCIF controller | |
1175 | ||
1176 | CONFIG_SH_MMCIF_ADDR | |
1177 | Define the base address of MMCIF registers | |
1178 | ||
1179 | CONFIG_SH_MMCIF_CLK | |
1180 | Define the clock frequency for MMCIF | |
1181 | ||
1fd93c6e PA |
1182 | CONFIG_SUPPORT_EMMC_BOOT |
1183 | Enable some additional features of the eMMC boot partitions. | |
1184 | ||
1185 | CONFIG_SUPPORT_EMMC_RPMB | |
1186 | Enable the commands for reading, writing and programming the | |
1187 | key for the Replay Protection Memory Block partition in eMMC. | |
1188 | ||
b3ba6e94 | 1189 | - USB Device Firmware Update (DFU) class support: |
bb4059a5 | 1190 | CONFIG_DFU_OVER_USB |
b3ba6e94 TR |
1191 | This enables the USB portion of the DFU USB class |
1192 | ||
b3ba6e94 TR |
1193 | CONFIG_DFU_MMC |
1194 | This enables support for exposing (e)MMC devices via DFU. | |
1195 | ||
c6631764 PA |
1196 | CONFIG_DFU_NAND |
1197 | This enables support for exposing NAND devices via DFU. | |
1198 | ||
a9479f04 AM |
1199 | CONFIG_DFU_RAM |
1200 | This enables support for exposing RAM via DFU. | |
1201 | Note: DFU spec refer to non-volatile memory usage, but | |
1202 | allow usages beyond the scope of spec - here RAM usage, | |
1203 | one that would help mostly the developer. | |
1204 | ||
e7e75c70 HS |
1205 | CONFIG_SYS_DFU_DATA_BUF_SIZE |
1206 | Dfu transfer uses a buffer before writing data to the | |
1207 | raw storage device. Make the size (in bytes) of this buffer | |
1208 | configurable. The size of this buffer is also configurable | |
1209 | through the "dfu_bufsiz" environment variable. | |
1210 | ||
ea2453d5 PA |
1211 | CONFIG_SYS_DFU_MAX_FILE_SIZE |
1212 | When updating files rather than the raw storage device, | |
1213 | we use a static buffer to copy the file into and then write | |
1214 | the buffer once we've been given the whole file. Define | |
1215 | this to the maximum filesize (in bytes) for the buffer. | |
1216 | Default is 4 MiB if undefined. | |
1217 | ||
001a8319 HS |
1218 | DFU_DEFAULT_POLL_TIMEOUT |
1219 | Poll timeout [ms], is the timeout a device can send to the | |
1220 | host. The host must wait for this timeout before sending | |
1221 | a subsequent DFU_GET_STATUS request to the device. | |
1222 | ||
1223 | DFU_MANIFEST_POLL_TIMEOUT | |
1224 | Poll timeout [ms], which the device sends to the host when | |
1225 | entering dfuMANIFEST state. Host waits this timeout, before | |
1226 | sending again an USB request to the device. | |
1227 | ||
6705d81e | 1228 | - Journaling Flash filesystem support: |
b2482dff | 1229 | CONFIG_JFFS2_NAND |
6705d81e WD |
1230 | Define these for a default partition on a NAND device |
1231 | ||
6d0f6bcf JCPV |
1232 | CONFIG_SYS_JFFS2_FIRST_SECTOR, |
1233 | CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS | |
6705d81e WD |
1234 | Define these for a default partition on a NOR device |
1235 | ||
c609719b | 1236 | - Keyboard Support: |
39f615ed SG |
1237 | See Kconfig help for available keyboard drivers. |
1238 | ||
1239 | CONFIG_KEYBOARD | |
1240 | ||
1241 | Define this to enable a custom keyboard support. | |
1242 | This simply calls drv_keyboard_init() which must be | |
1243 | defined in your board-specific files. This option is deprecated | |
1244 | and is only used by novena. For new boards, use driver model | |
1245 | instead. | |
c609719b WD |
1246 | |
1247 | - Video support: | |
7d3053fb | 1248 | CONFIG_FSL_DIU_FB |
04e5ae79 | 1249 | Enable the Freescale DIU video driver. Reference boards for |
7d3053fb TT |
1250 | SOCs that have a DIU should define this macro to enable DIU |
1251 | support, and should also define these other macros: | |
1252 | ||
1253 | CONFIG_SYS_DIU_ADDR | |
1254 | CONFIG_VIDEO | |
7d3053fb TT |
1255 | CONFIG_CFB_CONSOLE |
1256 | CONFIG_VIDEO_SW_CURSOR | |
1257 | CONFIG_VGA_AS_SINGLE_DEVICE | |
1258 | CONFIG_VIDEO_LOGO | |
1259 | CONFIG_VIDEO_BMP_LOGO | |
1260 | ||
ba8e76bd TT |
1261 | The DIU driver will look for the 'video-mode' environment |
1262 | variable, and if defined, enable the DIU as a console during | |
8eca9439 | 1263 | boot. See the documentation file doc/README.video for a |
ba8e76bd | 1264 | description of this variable. |
7d3053fb | 1265 | |
c609719b WD |
1266 | - LCD Support: CONFIG_LCD |
1267 | ||
1268 | Define this to enable LCD support (for output to LCD | |
1269 | display); also select one of the supported displays | |
1270 | by defining one of these: | |
1271 | ||
39cf4804 SP |
1272 | CONFIG_ATMEL_LCD: |
1273 | ||
1274 | HITACHI TX09D70VM1CCA, 3.5", 240x320. | |
1275 | ||
fd3103bb | 1276 | CONFIG_NEC_NL6448AC33: |
c609719b | 1277 | |
fd3103bb | 1278 | NEC NL6448AC33-18. Active, color, single scan. |
c609719b | 1279 | |
fd3103bb | 1280 | CONFIG_NEC_NL6448BC20 |
c609719b | 1281 | |
fd3103bb WD |
1282 | NEC NL6448BC20-08. 6.5", 640x480. |
1283 | Active, color, single scan. | |
1284 | ||
1285 | CONFIG_NEC_NL6448BC33_54 | |
1286 | ||
1287 | NEC NL6448BC33-54. 10.4", 640x480. | |
c609719b WD |
1288 | Active, color, single scan. |
1289 | ||
1290 | CONFIG_SHARP_16x9 | |
1291 | ||
1292 | Sharp 320x240. Active, color, single scan. | |
1293 | It isn't 16x9, and I am not sure what it is. | |
1294 | ||
1295 | CONFIG_SHARP_LQ64D341 | |
1296 | ||
1297 | Sharp LQ64D341 display, 640x480. | |
1298 | Active, color, single scan. | |
1299 | ||
1300 | CONFIG_HLD1045 | |
1301 | ||
1302 | HLD1045 display, 640x480. | |
1303 | Active, color, single scan. | |
1304 | ||
1305 | CONFIG_OPTREX_BW | |
1306 | ||
1307 | Optrex CBL50840-2 NF-FW 99 22 M5 | |
1308 | or | |
1309 | Hitachi LMG6912RPFC-00T | |
1310 | or | |
1311 | Hitachi SP14Q002 | |
1312 | ||
1313 | 320x240. Black & white. | |
1314 | ||
676d319e SG |
1315 | CONFIG_LCD_ALIGNMENT |
1316 | ||
b445bbb4 | 1317 | Normally the LCD is page-aligned (typically 4KB). If this is |
676d319e SG |
1318 | defined then the LCD will be aligned to this value instead. |
1319 | For ARM it is sometimes useful to use MMU_SECTION_SIZE | |
1320 | here, since it is cheaper to change data cache settings on | |
1321 | a per-section basis. | |
1322 | ||
1323 | ||
604c7d4a HP |
1324 | CONFIG_LCD_ROTATION |
1325 | ||
1326 | Sometimes, for example if the display is mounted in portrait | |
1327 | mode or even if it's mounted landscape but rotated by 180degree, | |
1328 | we need to rotate our content of the display relative to the | |
1329 | framebuffer, so that user can read the messages which are | |
1330 | printed out. | |
1331 | Once CONFIG_LCD_ROTATION is defined, the lcd_console will be | |
1332 | initialized with a given rotation from "vl_rot" out of | |
1333 | "vidinfo_t" which is provided by the board specific code. | |
1334 | The value for vl_rot is coded as following (matching to | |
1335 | fbcon=rotate:<n> linux-kernel commandline): | |
1336 | 0 = no rotation respectively 0 degree | |
1337 | 1 = 90 degree rotation | |
1338 | 2 = 180 degree rotation | |
1339 | 3 = 270 degree rotation | |
1340 | ||
1341 | If CONFIG_LCD_ROTATION is not defined, the console will be | |
1342 | initialized with 0degree rotation. | |
1343 | ||
45d7f525 TWHT |
1344 | CONFIG_LCD_BMP_RLE8 |
1345 | ||
1346 | Support drawing of RLE8-compressed bitmaps on the LCD. | |
1347 | ||
735987c5 TWHT |
1348 | CONFIG_I2C_EDID |
1349 | ||
1350 | Enables an 'i2c edid' command which can read EDID | |
1351 | information over I2C from an attached LCD display. | |
1352 | ||
7152b1d0 | 1353 | - Splash Screen Support: CONFIG_SPLASH_SCREEN |
d791b1dc | 1354 | |
8bde7f77 WD |
1355 | If this option is set, the environment is checked for |
1356 | a variable "splashimage". If found, the usual display | |
1357 | of logo, copyright and system information on the LCD | |
e94d2cd9 | 1358 | is suppressed and the BMP image at the address |
8bde7f77 WD |
1359 | specified in "splashimage" is loaded instead. The |
1360 | console is redirected to the "nulldev", too. This | |
1361 | allows for a "silent" boot where a splash screen is | |
1362 | loaded very quickly after power-on. | |
d791b1dc | 1363 | |
c0880485 NK |
1364 | CONFIG_SPLASHIMAGE_GUARD |
1365 | ||
1366 | If this option is set, then U-Boot will prevent the environment | |
1367 | variable "splashimage" from being set to a problematic address | |
ab5645f1 | 1368 | (see doc/README.displaying-bmps). |
c0880485 NK |
1369 | This option is useful for targets where, due to alignment |
1370 | restrictions, an improperly aligned BMP image will cause a data | |
1371 | abort. If you think you will not have problems with unaligned | |
1372 | accesses (for example because your toolchain prevents them) | |
1373 | there is no need to set this option. | |
1374 | ||
1ca298ce MW |
1375 | CONFIG_SPLASH_SCREEN_ALIGN |
1376 | ||
1377 | If this option is set the splash image can be freely positioned | |
1378 | on the screen. Environment variable "splashpos" specifies the | |
1379 | position as "x,y". If a positive number is given it is used as | |
1380 | number of pixel from left/top. If a negative number is given it | |
1381 | is used as number of pixel from right/bottom. You can also | |
1382 | specify 'm' for centering the image. | |
1383 | ||
1384 | Example: | |
1385 | setenv splashpos m,m | |
1386 | => image at center of screen | |
1387 | ||
1388 | setenv splashpos 30,20 | |
1389 | => image at x = 30 and y = 20 | |
1390 | ||
1391 | setenv splashpos -10,m | |
1392 | => vertically centered image | |
1393 | at x = dspWidth - bmpWidth - 9 | |
1394 | ||
98f4a3df SR |
1395 | - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP |
1396 | ||
1397 | If this option is set, additionally to standard BMP | |
1398 | images, gzipped BMP images can be displayed via the | |
1399 | splashscreen support or the bmp command. | |
1400 | ||
d5011762 AG |
1401 | - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8 |
1402 | ||
1403 | If this option is set, 8-bit RLE compressed BMP images | |
1404 | can be displayed via the splashscreen support or the | |
1405 | bmp command. | |
1406 | ||
c29fdfc1 | 1407 | - Compression support: |
8ef70478 KC |
1408 | CONFIG_GZIP |
1409 | ||
1410 | Enabled by default to support gzip compressed images. | |
1411 | ||
c29fdfc1 WD |
1412 | CONFIG_BZIP2 |
1413 | ||
1414 | If this option is set, support for bzip2 compressed | |
1415 | images is included. If not, only uncompressed and gzip | |
1416 | compressed images are supported. | |
1417 | ||
42d1f039 | 1418 | NOTE: the bzip2 algorithm requires a lot of RAM, so |
6d0f6bcf | 1419 | the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should |
42d1f039 | 1420 | be at least 4MB. |
d791b1dc | 1421 | |
17ea1177 WD |
1422 | - MII/PHY support: |
1423 | CONFIG_PHY_ADDR | |
1424 | ||
1425 | The address of PHY on MII bus. | |
1426 | ||
1427 | CONFIG_PHY_CLOCK_FREQ (ppc4xx) | |
1428 | ||
1429 | The clock frequency of the MII bus | |
1430 | ||
17ea1177 WD |
1431 | CONFIG_PHY_RESET_DELAY |
1432 | ||
1433 | Some PHY like Intel LXT971A need extra delay after | |
1434 | reset before any MII register access is possible. | |
1435 | For such PHY, set this option to the usec delay | |
1436 | required. (minimum 300usec for LXT971A) | |
1437 | ||
1438 | CONFIG_PHY_CMD_DELAY (ppc4xx) | |
1439 | ||
1440 | Some PHY like Intel LXT971A need extra delay after | |
1441 | command issued before MII status register can be read | |
1442 | ||
c609719b WD |
1443 | - IP address: |
1444 | CONFIG_IPADDR | |
1445 | ||
1446 | Define a default value for the IP address to use for | |
11ccc33f | 1447 | the default Ethernet interface, in case this is not |
c609719b | 1448 | determined through e.g. bootp. |
1ebcd654 | 1449 | (Environment variable "ipaddr") |
c609719b WD |
1450 | |
1451 | - Server IP address: | |
1452 | CONFIG_SERVERIP | |
1453 | ||
11ccc33f | 1454 | Defines a default value for the IP address of a TFTP |
c609719b | 1455 | server to contact when using the "tftboot" command. |
1ebcd654 | 1456 | (Environment variable "serverip") |
c609719b | 1457 | |
97cfe861 RG |
1458 | CONFIG_KEEP_SERVERADDR |
1459 | ||
1460 | Keeps the server's MAC address, in the env 'serveraddr' | |
1461 | for passing to bootargs (like Linux's netconsole option) | |
1462 | ||
1ebcd654 WD |
1463 | - Gateway IP address: |
1464 | CONFIG_GATEWAYIP | |
1465 | ||
1466 | Defines a default value for the IP address of the | |
1467 | default router where packets to other networks are | |
1468 | sent to. | |
1469 | (Environment variable "gatewayip") | |
1470 | ||
1471 | - Subnet mask: | |
1472 | CONFIG_NETMASK | |
1473 | ||
1474 | Defines a default value for the subnet mask (or | |
1475 | routing prefix) which is used to determine if an IP | |
1476 | address belongs to the local subnet or needs to be | |
1477 | forwarded through a router. | |
1478 | (Environment variable "netmask") | |
1479 | ||
53a5c424 DU |
1480 | - Multicast TFTP Mode: |
1481 | CONFIG_MCAST_TFTP | |
1482 | ||
1483 | Defines whether you want to support multicast TFTP as per | |
1484 | rfc-2090; for example to work with atftp. Lets lots of targets | |
11ccc33f | 1485 | tftp down the same boot image concurrently. Note: the Ethernet |
53a5c424 DU |
1486 | driver in use must provide a function: mcast() to join/leave a |
1487 | multicast group. | |
1488 | ||
c609719b WD |
1489 | - BOOTP Recovery Mode: |
1490 | CONFIG_BOOTP_RANDOM_DELAY | |
1491 | ||
1492 | If you have many targets in a network that try to | |
1493 | boot using BOOTP, you may want to avoid that all | |
1494 | systems send out BOOTP requests at precisely the same | |
1495 | moment (which would happen for instance at recovery | |
1496 | from a power failure, when all systems will try to | |
1497 | boot, thus flooding the BOOTP server. Defining | |
1498 | CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be | |
1499 | inserted before sending out BOOTP requests. The | |
6c33c785 | 1500 | following delays are inserted then: |
c609719b WD |
1501 | |
1502 | 1st BOOTP request: delay 0 ... 1 sec | |
1503 | 2nd BOOTP request: delay 0 ... 2 sec | |
1504 | 3rd BOOTP request: delay 0 ... 4 sec | |
1505 | 4th and following | |
1506 | BOOTP requests: delay 0 ... 8 sec | |
1507 | ||
92ac8acc TR |
1508 | CONFIG_BOOTP_ID_CACHE_SIZE |
1509 | ||
1510 | BOOTP packets are uniquely identified using a 32-bit ID. The | |
1511 | server will copy the ID from client requests to responses and | |
1512 | U-Boot will use this to determine if it is the destination of | |
1513 | an incoming response. Some servers will check that addresses | |
1514 | aren't in use before handing them out (usually using an ARP | |
1515 | ping) and therefore take up to a few hundred milliseconds to | |
1516 | respond. Network congestion may also influence the time it | |
1517 | takes for a response to make it back to the client. If that | |
1518 | time is too long, U-Boot will retransmit requests. In order | |
1519 | to allow earlier responses to still be accepted after these | |
1520 | retransmissions, U-Boot's BOOTP client keeps a small cache of | |
1521 | IDs. The CONFIG_BOOTP_ID_CACHE_SIZE controls the size of this | |
1522 | cache. The default is to keep IDs for up to four outstanding | |
1523 | requests. Increasing this will allow U-Boot to accept offers | |
1524 | from a BOOTP client in networks with unusually high latency. | |
1525 | ||
fe389a82 | 1526 | - DHCP Advanced Options: |
1fe80d79 JL |
1527 | You can fine tune the DHCP functionality by defining |
1528 | CONFIG_BOOTP_* symbols: | |
1529 | ||
1fe80d79 | 1530 | CONFIG_BOOTP_NISDOMAIN |
1fe80d79 | 1531 | CONFIG_BOOTP_BOOTFILESIZE |
1fe80d79 JL |
1532 | CONFIG_BOOTP_SEND_HOSTNAME |
1533 | CONFIG_BOOTP_NTPSERVER | |
1534 | CONFIG_BOOTP_TIMEOFFSET | |
1535 | CONFIG_BOOTP_VENDOREX | |
2c00e099 | 1536 | CONFIG_BOOTP_MAY_FAIL |
fe389a82 | 1537 | |
5d110f0a WC |
1538 | CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip |
1539 | environment variable, not the BOOTP server. | |
fe389a82 | 1540 | |
2c00e099 JH |
1541 | CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found |
1542 | after the configured retry count, the call will fail | |
1543 | instead of starting over. This can be used to fail over | |
1544 | to Link-local IP address configuration if the DHCP server | |
1545 | is not available. | |
1546 | ||
fe389a82 SR |
1547 | CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable |
1548 | to do a dynamic update of a DNS server. To do this, they | |
1549 | need the hostname of the DHCP requester. | |
5d110f0a | 1550 | If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content |
1fe80d79 JL |
1551 | of the "hostname" environment variable is passed as |
1552 | option 12 to the DHCP server. | |
fe389a82 | 1553 | |
d9a2f416 AV |
1554 | CONFIG_BOOTP_DHCP_REQUEST_DELAY |
1555 | ||
1556 | A 32bit value in microseconds for a delay between | |
1557 | receiving a "DHCP Offer" and sending the "DHCP Request". | |
1558 | This fixes a problem with certain DHCP servers that don't | |
1559 | respond 100% of the time to a "DHCP request". E.g. On an | |
1560 | AT91RM9200 processor running at 180MHz, this delay needed | |
1561 | to be *at least* 15,000 usec before a Windows Server 2003 | |
1562 | DHCP server would reply 100% of the time. I recommend at | |
1563 | least 50,000 usec to be safe. The alternative is to hope | |
1564 | that one of the retries will be successful but note that | |
1565 | the DHCP timeout and retry process takes a longer than | |
1566 | this delay. | |
1567 | ||
d22c338e JH |
1568 | - Link-local IP address negotiation: |
1569 | Negotiate with other link-local clients on the local network | |
1570 | for an address that doesn't require explicit configuration. | |
1571 | This is especially useful if a DHCP server cannot be guaranteed | |
1572 | to exist in all environments that the device must operate. | |
1573 | ||
1574 | See doc/README.link-local for more information. | |
1575 | ||
24acb83d PK |
1576 | - MAC address from environment variables |
1577 | ||
1578 | FDT_SEQ_MACADDR_FROM_ENV | |
1579 | ||
1580 | Fix-up device tree with MAC addresses fetched sequentially from | |
1581 | environment variables. This config work on assumption that | |
1582 | non-usable ethernet node of device-tree are either not present | |
1583 | or their status has been marked as "disabled". | |
1584 | ||
a3d991bd | 1585 | - CDP Options: |
6e592385 | 1586 | CONFIG_CDP_DEVICE_ID |
a3d991bd WD |
1587 | |
1588 | The device id used in CDP trigger frames. | |
1589 | ||
1590 | CONFIG_CDP_DEVICE_ID_PREFIX | |
1591 | ||
1592 | A two character string which is prefixed to the MAC address | |
1593 | of the device. | |
1594 | ||
1595 | CONFIG_CDP_PORT_ID | |
1596 | ||
1597 | A printf format string which contains the ascii name of | |
1598 | the port. Normally is set to "eth%d" which sets | |
11ccc33f | 1599 | eth0 for the first Ethernet, eth1 for the second etc. |
a3d991bd WD |
1600 | |
1601 | CONFIG_CDP_CAPABILITIES | |
1602 | ||
1603 | A 32bit integer which indicates the device capabilities; | |
1604 | 0x00000010 for a normal host which does not forwards. | |
1605 | ||
1606 | CONFIG_CDP_VERSION | |
1607 | ||
1608 | An ascii string containing the version of the software. | |
1609 | ||
1610 | CONFIG_CDP_PLATFORM | |
1611 | ||
1612 | An ascii string containing the name of the platform. | |
1613 | ||
1614 | CONFIG_CDP_TRIGGER | |
1615 | ||
1616 | A 32bit integer sent on the trigger. | |
1617 | ||
1618 | CONFIG_CDP_POWER_CONSUMPTION | |
1619 | ||
1620 | A 16bit integer containing the power consumption of the | |
1621 | device in .1 of milliwatts. | |
1622 | ||
1623 | CONFIG_CDP_APPLIANCE_VLAN_TYPE | |
1624 | ||
1625 | A byte containing the id of the VLAN. | |
1626 | ||
79267edd | 1627 | - Status LED: CONFIG_LED_STATUS |
c609719b WD |
1628 | |
1629 | Several configurations allow to display the current | |
1630 | status using a LED. For instance, the LED will blink | |
1631 | fast while running U-Boot code, stop blinking as | |
1632 | soon as a reply to a BOOTP request was received, and | |
1633 | start blinking slow once the Linux kernel is running | |
1634 | (supported by a status LED driver in the Linux | |
79267edd | 1635 | kernel). Defining CONFIG_LED_STATUS enables this |
c609719b WD |
1636 | feature in U-Boot. |
1637 | ||
1df7bbba IG |
1638 | Additional options: |
1639 | ||
79267edd | 1640 | CONFIG_LED_STATUS_GPIO |
1df7bbba IG |
1641 | The status LED can be connected to a GPIO pin. |
1642 | In such cases, the gpio_led driver can be used as a | |
79267edd | 1643 | status LED backend implementation. Define CONFIG_LED_STATUS_GPIO |
1df7bbba IG |
1644 | to include the gpio_led driver in the U-Boot binary. |
1645 | ||
9dfdcdfe IG |
1646 | CONFIG_GPIO_LED_INVERTED_TABLE |
1647 | Some GPIO connected LEDs may have inverted polarity in which | |
1648 | case the GPIO high value corresponds to LED off state and | |
1649 | GPIO low value corresponds to LED on state. | |
1650 | In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined | |
1651 | with a list of GPIO LEDs that have inverted polarity. | |
1652 | ||
3f4978c7 HS |
1653 | - I2C Support: CONFIG_SYS_I2C |
1654 | ||
1655 | This enable the NEW i2c subsystem, and will allow you to use | |
1656 | i2c commands at the u-boot command line (as long as you set | |
1657 | CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c | |
1658 | based realtime clock chips or other i2c devices. See | |
1659 | common/cmd_i2c.c for a description of the command line | |
1660 | interface. | |
1661 | ||
1662 | ported i2c driver to the new framework: | |
ea818dbb HS |
1663 | - drivers/i2c/soft_i2c.c: |
1664 | - activate first bus with CONFIG_SYS_I2C_SOFT define | |
1665 | CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE | |
1666 | for defining speed and slave address | |
1667 | - activate second bus with I2C_SOFT_DECLARATIONS2 define | |
1668 | CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2 | |
1669 | for defining speed and slave address | |
1670 | - activate third bus with I2C_SOFT_DECLARATIONS3 define | |
1671 | CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3 | |
1672 | for defining speed and slave address | |
1673 | - activate fourth bus with I2C_SOFT_DECLARATIONS4 define | |
1674 | CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4 | |
1675 | for defining speed and slave address | |
3f4978c7 | 1676 | |
00f792e0 HS |
1677 | - drivers/i2c/fsl_i2c.c: |
1678 | - activate i2c driver with CONFIG_SYS_I2C_FSL | |
1679 | define CONFIG_SYS_FSL_I2C_OFFSET for setting the register | |
1680 | offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and | |
1681 | CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first | |
1682 | bus. | |
93e14596 | 1683 | - If your board supports a second fsl i2c bus, define |
00f792e0 HS |
1684 | CONFIG_SYS_FSL_I2C2_OFFSET for the register offset |
1685 | CONFIG_SYS_FSL_I2C2_SPEED for the speed and | |
1686 | CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the | |
1687 | second bus. | |
1688 | ||
1f2ba722 | 1689 | - drivers/i2c/tegra_i2c.c: |
10cee516 NI |
1690 | - activate this driver with CONFIG_SYS_I2C_TEGRA |
1691 | - This driver adds 4 i2c buses with a fix speed from | |
1692 | 100000 and the slave addr 0! | |
1f2ba722 | 1693 | |
880540de DE |
1694 | - drivers/i2c/ppc4xx_i2c.c |
1695 | - activate this driver with CONFIG_SYS_I2C_PPC4XX | |
1696 | - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0 | |
1697 | - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1 | |
1698 | ||
fac96408 | 1699 | - drivers/i2c/i2c_mxc.c |
1700 | - activate this driver with CONFIG_SYS_I2C_MXC | |
03544c66 AA |
1701 | - enable bus 1 with CONFIG_SYS_I2C_MXC_I2C1 |
1702 | - enable bus 2 with CONFIG_SYS_I2C_MXC_I2C2 | |
1703 | - enable bus 3 with CONFIG_SYS_I2C_MXC_I2C3 | |
1704 | - enable bus 4 with CONFIG_SYS_I2C_MXC_I2C4 | |
fac96408 | 1705 | - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED |
1706 | - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE | |
1707 | - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED | |
1708 | - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE | |
1709 | - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED | |
1710 | - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE | |
03544c66 AA |
1711 | - define speed for bus 4 with CONFIG_SYS_MXC_I2C4_SPEED |
1712 | - define slave for bus 4 with CONFIG_SYS_MXC_I2C4_SLAVE | |
b445bbb4 | 1713 | If those defines are not set, default value is 100000 |
fac96408 | 1714 | for speed, and 0 for slave. |
1715 | ||
1086bfa9 NI |
1716 | - drivers/i2c/rcar_i2c.c: |
1717 | - activate this driver with CONFIG_SYS_I2C_RCAR | |
1718 | - This driver adds 4 i2c buses | |
1719 | ||
1720 | - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0 | |
1721 | - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0 | |
1722 | - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1 | |
1723 | - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1 | |
1724 | - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2 | |
1725 | - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2 | |
1726 | - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3 | |
1727 | - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3 | |
1728 | - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses | |
1729 | ||
2035d77d NI |
1730 | - drivers/i2c/sh_i2c.c: |
1731 | - activate this driver with CONFIG_SYS_I2C_SH | |
1732 | - This driver adds from 2 to 5 i2c buses | |
1733 | ||
1734 | - CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0 | |
1735 | - CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0 | |
1736 | - CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1 | |
1737 | - CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1 | |
1738 | - CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2 | |
1739 | - CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2 | |
1740 | - CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3 | |
1741 | - CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3 | |
1742 | - CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4 | |
1743 | - CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4 | |
b445bbb4 | 1744 | - CONFIG_SYS_I2C_SH_NUM_CONTROLLERS for number of i2c buses |
2035d77d | 1745 | |
6789e84e HS |
1746 | - drivers/i2c/omap24xx_i2c.c |
1747 | - activate this driver with CONFIG_SYS_I2C_OMAP24XX | |
1748 | - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0 | |
1749 | - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0 | |
1750 | - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1 | |
1751 | - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1 | |
1752 | - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2 | |
1753 | - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2 | |
1754 | - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3 | |
1755 | - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3 | |
1756 | - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4 | |
1757 | - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4 | |
1758 | ||
0bdffe71 HS |
1759 | - drivers/i2c/zynq_i2c.c |
1760 | - activate this driver with CONFIG_SYS_I2C_ZYNQ | |
1761 | - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting | |
1762 | - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr | |
1763 | ||
e717fc6d NKC |
1764 | - drivers/i2c/s3c24x0_i2c.c: |
1765 | - activate this driver with CONFIG_SYS_I2C_S3C24X0 | |
1766 | - This driver adds i2c buses (11 for Exynos5250, Exynos5420 | |
1767 | 9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung) | |
1768 | with a fix speed from 100000 and the slave addr 0! | |
1769 | ||
b46226bd DE |
1770 | - drivers/i2c/ihs_i2c.c |
1771 | - activate this driver with CONFIG_SYS_I2C_IHS | |
1772 | - CONFIG_SYS_I2C_IHS_CH0 activate hardware channel 0 | |
1773 | - CONFIG_SYS_I2C_IHS_SPEED_0 speed channel 0 | |
1774 | - CONFIG_SYS_I2C_IHS_SLAVE_0 slave addr channel 0 | |
1775 | - CONFIG_SYS_I2C_IHS_CH1 activate hardware channel 1 | |
1776 | - CONFIG_SYS_I2C_IHS_SPEED_1 speed channel 1 | |
1777 | - CONFIG_SYS_I2C_IHS_SLAVE_1 slave addr channel 1 | |
1778 | - CONFIG_SYS_I2C_IHS_CH2 activate hardware channel 2 | |
1779 | - CONFIG_SYS_I2C_IHS_SPEED_2 speed channel 2 | |
1780 | - CONFIG_SYS_I2C_IHS_SLAVE_2 slave addr channel 2 | |
1781 | - CONFIG_SYS_I2C_IHS_CH3 activate hardware channel 3 | |
1782 | - CONFIG_SYS_I2C_IHS_SPEED_3 speed channel 3 | |
1783 | - CONFIG_SYS_I2C_IHS_SLAVE_3 slave addr channel 3 | |
071be896 DE |
1784 | - activate dual channel with CONFIG_SYS_I2C_IHS_DUAL |
1785 | - CONFIG_SYS_I2C_IHS_SPEED_0_1 speed channel 0_1 | |
1786 | - CONFIG_SYS_I2C_IHS_SLAVE_0_1 slave addr channel 0_1 | |
1787 | - CONFIG_SYS_I2C_IHS_SPEED_1_1 speed channel 1_1 | |
1788 | - CONFIG_SYS_I2C_IHS_SLAVE_1_1 slave addr channel 1_1 | |
1789 | - CONFIG_SYS_I2C_IHS_SPEED_2_1 speed channel 2_1 | |
1790 | - CONFIG_SYS_I2C_IHS_SLAVE_2_1 slave addr channel 2_1 | |
1791 | - CONFIG_SYS_I2C_IHS_SPEED_3_1 speed channel 3_1 | |
1792 | - CONFIG_SYS_I2C_IHS_SLAVE_3_1 slave addr channel 3_1 | |
b46226bd | 1793 | |
3f4978c7 HS |
1794 | additional defines: |
1795 | ||
1796 | CONFIG_SYS_NUM_I2C_BUSES | |
945a18e6 | 1797 | Hold the number of i2c buses you want to use. |
3f4978c7 HS |
1798 | |
1799 | CONFIG_SYS_I2C_DIRECT_BUS | |
1800 | define this, if you don't use i2c muxes on your hardware. | |
1801 | if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can | |
1802 | omit this define. | |
1803 | ||
1804 | CONFIG_SYS_I2C_MAX_HOPS | |
1805 | define how many muxes are maximal consecutively connected | |
1806 | on one i2c bus. If you not use i2c muxes, omit this | |
1807 | define. | |
1808 | ||
1809 | CONFIG_SYS_I2C_BUSES | |
b445bbb4 | 1810 | hold a list of buses you want to use, only used if |
3f4978c7 HS |
1811 | CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example |
1812 | a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and | |
1813 | CONFIG_SYS_NUM_I2C_BUSES = 9: | |
1814 | ||
1815 | CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \ | |
1816 | {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \ | |
1817 | {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \ | |
1818 | {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \ | |
1819 | {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \ | |
1820 | {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \ | |
1821 | {1, {I2C_NULL_HOP}}, \ | |
1822 | {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \ | |
1823 | {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \ | |
1824 | } | |
1825 | ||
1826 | which defines | |
1827 | bus 0 on adapter 0 without a mux | |
ea818dbb HS |
1828 | bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1 |
1829 | bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2 | |
1830 | bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3 | |
1831 | bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4 | |
1832 | bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5 | |
3f4978c7 | 1833 | bus 6 on adapter 1 without a mux |
ea818dbb HS |
1834 | bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1 |
1835 | bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2 | |
3f4978c7 HS |
1836 | |
1837 | If you do not have i2c muxes on your board, omit this define. | |
1838 | ||
ce3b5d69 | 1839 | - Legacy I2C Support: |
ea818dbb | 1840 | If you use the software i2c interface (CONFIG_SYS_I2C_SOFT) |
b37c7e5e WD |
1841 | then the following macros need to be defined (examples are |
1842 | from include/configs/lwmon.h): | |
c609719b WD |
1843 | |
1844 | I2C_INIT | |
1845 | ||
b37c7e5e | 1846 | (Optional). Any commands necessary to enable the I2C |
43d9616c | 1847 | controller or configure ports. |
c609719b | 1848 | |
ba56f625 | 1849 | eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) |
b37c7e5e | 1850 | |
c609719b WD |
1851 | I2C_ACTIVE |
1852 | ||
1853 | The code necessary to make the I2C data line active | |
1854 | (driven). If the data line is open collector, this | |
1855 | define can be null. | |
1856 | ||
b37c7e5e WD |
1857 | eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) |
1858 | ||
c609719b WD |
1859 | I2C_TRISTATE |
1860 | ||
1861 | The code necessary to make the I2C data line tri-stated | |
1862 | (inactive). If the data line is open collector, this | |
1863 | define can be null. | |
1864 | ||
b37c7e5e WD |
1865 | eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) |
1866 | ||
c609719b WD |
1867 | I2C_READ |
1868 | ||
472d5460 YS |
1869 | Code that returns true if the I2C data line is high, |
1870 | false if it is low. | |
c609719b | 1871 | |
b37c7e5e WD |
1872 | eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) |
1873 | ||
c609719b WD |
1874 | I2C_SDA(bit) |
1875 | ||
472d5460 YS |
1876 | If <bit> is true, sets the I2C data line high. If it |
1877 | is false, it clears it (low). | |
c609719b | 1878 | |
b37c7e5e | 1879 | eg: #define I2C_SDA(bit) \ |
2535d602 | 1880 | if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ |
ba56f625 | 1881 | else immr->im_cpm.cp_pbdat &= ~PB_SDA |
b37c7e5e | 1882 | |
c609719b WD |
1883 | I2C_SCL(bit) |
1884 | ||
472d5460 YS |
1885 | If <bit> is true, sets the I2C clock line high. If it |
1886 | is false, it clears it (low). | |
c609719b | 1887 | |
b37c7e5e | 1888 | eg: #define I2C_SCL(bit) \ |
2535d602 | 1889 | if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ |
ba56f625 | 1890 | else immr->im_cpm.cp_pbdat &= ~PB_SCL |
b37c7e5e | 1891 | |
c609719b WD |
1892 | I2C_DELAY |
1893 | ||
1894 | This delay is invoked four times per clock cycle so this | |
1895 | controls the rate of data transfer. The data rate thus | |
b37c7e5e | 1896 | is 1 / (I2C_DELAY * 4). Often defined to be something |
945af8d7 WD |
1897 | like: |
1898 | ||
b37c7e5e | 1899 | #define I2C_DELAY udelay(2) |
c609719b | 1900 | |
793b5726 MF |
1901 | CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA |
1902 | ||
1903 | If your arch supports the generic GPIO framework (asm/gpio.h), | |
1904 | then you may alternatively define the two GPIOs that are to be | |
1905 | used as SCL / SDA. Any of the previous I2C_xxx macros will | |
1906 | have GPIO-based defaults assigned to them as appropriate. | |
1907 | ||
1908 | You should define these to the GPIO value as given directly to | |
1909 | the generic GPIO functions. | |
1910 | ||
6d0f6bcf | 1911 | CONFIG_SYS_I2C_INIT_BOARD |
47cd00fa | 1912 | |
8bde7f77 WD |
1913 | When a board is reset during an i2c bus transfer |
1914 | chips might think that the current transfer is still | |
1915 | in progress. On some boards it is possible to access | |
1916 | the i2c SCLK line directly, either by using the | |
1917 | processor pin as a GPIO or by having a second pin | |
1918 | connected to the bus. If this option is defined a | |
1919 | custom i2c_init_board() routine in boards/xxx/board.c | |
1920 | is run early in the boot sequence. | |
47cd00fa | 1921 | |
bb99ad6d BW |
1922 | CONFIG_I2C_MULTI_BUS |
1923 | ||
1924 | This option allows the use of multiple I2C buses, each of which | |
c0f40859 WD |
1925 | must have a controller. At any point in time, only one bus is |
1926 | active. To switch to a different bus, use the 'i2c dev' command. | |
bb99ad6d BW |
1927 | Note that bus numbering is zero-based. |
1928 | ||
6d0f6bcf | 1929 | CONFIG_SYS_I2C_NOPROBES |
bb99ad6d BW |
1930 | |
1931 | This option specifies a list of I2C devices that will be skipped | |
c0f40859 | 1932 | when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS |
0f89c54b PT |
1933 | is set, specify a list of bus-device pairs. Otherwise, specify |
1934 | a 1D array of device addresses | |
bb99ad6d BW |
1935 | |
1936 | e.g. | |
1937 | #undef CONFIG_I2C_MULTI_BUS | |
c0f40859 | 1938 | #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} |
bb99ad6d BW |
1939 | |
1940 | will skip addresses 0x50 and 0x68 on a board with one I2C bus | |
1941 | ||
c0f40859 | 1942 | #define CONFIG_I2C_MULTI_BUS |
945a18e6 | 1943 | #define CONFIG_SYS_I2C_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} |
bb99ad6d BW |
1944 | |
1945 | will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 | |
1946 | ||
6d0f6bcf | 1947 | CONFIG_SYS_SPD_BUS_NUM |
be5e6181 TT |
1948 | |
1949 | If defined, then this indicates the I2C bus number for DDR SPD. | |
1950 | If not defined, then U-Boot assumes that SPD is on I2C bus 0. | |
1951 | ||
6d0f6bcf | 1952 | CONFIG_SYS_RTC_BUS_NUM |
0dc018ec SR |
1953 | |
1954 | If defined, then this indicates the I2C bus number for the RTC. | |
1955 | If not defined, then U-Boot assumes that RTC is on I2C bus 0. | |
1956 | ||
2ac6985a AD |
1957 | CONFIG_SOFT_I2C_READ_REPEATED_START |
1958 | ||
1959 | defining this will force the i2c_read() function in | |
1960 | the soft_i2c driver to perform an I2C repeated start | |
1961 | between writing the address pointer and reading the | |
1962 | data. If this define is omitted the default behaviour | |
1963 | of doing a stop-start sequence will be used. Most I2C | |
1964 | devices can use either method, but some require one or | |
1965 | the other. | |
be5e6181 | 1966 | |
c609719b WD |
1967 | - SPI Support: CONFIG_SPI |
1968 | ||
1969 | Enables SPI driver (so far only tested with | |
1970 | SPI EEPROM, also an instance works with Crystal A/D and | |
1971 | D/As on the SACSng board) | |
1972 | ||
c609719b WD |
1973 | CONFIG_SOFT_SPI |
1974 | ||
43d9616c WD |
1975 | Enables a software (bit-bang) SPI driver rather than |
1976 | using hardware support. This is a general purpose | |
1977 | driver that only requires three general I/O port pins | |
1978 | (two outputs, one input) to function. If this is | |
1979 | defined, the board configuration must define several | |
1980 | SPI configuration items (port pins to use, etc). For | |
1981 | an example, see include/configs/sacsng.h. | |
c609719b | 1982 | |
04a9e118 BW |
1983 | CONFIG_HARD_SPI |
1984 | ||
1985 | Enables a hardware SPI driver for general-purpose reads | |
1986 | and writes. As with CONFIG_SOFT_SPI, the board configuration | |
1987 | must define a list of chip-select function pointers. | |
c0f40859 | 1988 | Currently supported on some MPC8xxx processors. For an |
04a9e118 BW |
1989 | example, see include/configs/mpc8349emds.h. |
1990 | ||
f659b573 HS |
1991 | CONFIG_SYS_SPI_MXC_WAIT |
1992 | Timeout for waiting until spi transfer completed. | |
1993 | default: (CONFIG_SYS_HZ/100) /* 10 ms */ | |
1994 | ||
0133502e | 1995 | - FPGA Support: CONFIG_FPGA |
c609719b | 1996 | |
0133502e MF |
1997 | Enables FPGA subsystem. |
1998 | ||
1999 | CONFIG_FPGA_<vendor> | |
2000 | ||
2001 | Enables support for specific chip vendors. | |
2002 | (ALTERA, XILINX) | |
c609719b | 2003 | |
0133502e | 2004 | CONFIG_FPGA_<family> |
c609719b | 2005 | |
0133502e MF |
2006 | Enables support for FPGA family. |
2007 | (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) | |
2008 | ||
2009 | CONFIG_FPGA_COUNT | |
2010 | ||
2011 | Specify the number of FPGA devices to support. | |
c609719b | 2012 | |
6d0f6bcf | 2013 | CONFIG_SYS_FPGA_PROG_FEEDBACK |
c609719b | 2014 | |
8bde7f77 | 2015 | Enable printing of hash marks during FPGA configuration. |
c609719b | 2016 | |
6d0f6bcf | 2017 | CONFIG_SYS_FPGA_CHECK_BUSY |
c609719b | 2018 | |
43d9616c WD |
2019 | Enable checks on FPGA configuration interface busy |
2020 | status by the configuration function. This option | |
2021 | will require a board or device specific function to | |
2022 | be written. | |
c609719b WD |
2023 | |
2024 | CONFIG_FPGA_DELAY | |
2025 | ||
2026 | If defined, a function that provides delays in the FPGA | |
2027 | configuration driver. | |
2028 | ||
6d0f6bcf | 2029 | CONFIG_SYS_FPGA_CHECK_CTRLC |
c609719b WD |
2030 | Allow Control-C to interrupt FPGA configuration |
2031 | ||
6d0f6bcf | 2032 | CONFIG_SYS_FPGA_CHECK_ERROR |
c609719b | 2033 | |
43d9616c WD |
2034 | Check for configuration errors during FPGA bitfile |
2035 | loading. For example, abort during Virtex II | |
2036 | configuration if the INIT_B line goes low (which | |
2037 | indicated a CRC error). | |
c609719b | 2038 | |
6d0f6bcf | 2039 | CONFIG_SYS_FPGA_WAIT_INIT |
c609719b | 2040 | |
b445bbb4 JM |
2041 | Maximum time to wait for the INIT_B line to de-assert |
2042 | after PROB_B has been de-asserted during a Virtex II | |
43d9616c | 2043 | FPGA configuration sequence. The default time is 500 |
11ccc33f | 2044 | ms. |
c609719b | 2045 | |
6d0f6bcf | 2046 | CONFIG_SYS_FPGA_WAIT_BUSY |
c609719b | 2047 | |
b445bbb4 | 2048 | Maximum time to wait for BUSY to de-assert during |
11ccc33f | 2049 | Virtex II FPGA configuration. The default is 5 ms. |
c609719b | 2050 | |
6d0f6bcf | 2051 | CONFIG_SYS_FPGA_WAIT_CONFIG |
c609719b | 2052 | |
43d9616c | 2053 | Time to wait after FPGA configuration. The default is |
11ccc33f | 2054 | 200 ms. |
c609719b WD |
2055 | |
2056 | - Configuration Management: | |
b2b8a696 SR |
2057 | CONFIG_BUILD_TARGET |
2058 | ||
2059 | Some SoCs need special image types (e.g. U-Boot binary | |
2060 | with a special header) as build targets. By defining | |
2061 | CONFIG_BUILD_TARGET in the SoC / board header, this | |
2062 | special image will be automatically built upon calling | |
6de80f21 | 2063 | make / buildman. |
b2b8a696 | 2064 | |
c609719b WD |
2065 | CONFIG_IDENT_STRING |
2066 | ||
43d9616c WD |
2067 | If defined, this string will be added to the U-Boot |
2068 | version information (U_BOOT_VERSION) | |
c609719b WD |
2069 | |
2070 | - Vendor Parameter Protection: | |
2071 | ||
43d9616c WD |
2072 | U-Boot considers the values of the environment |
2073 | variables "serial#" (Board Serial Number) and | |
7152b1d0 | 2074 | "ethaddr" (Ethernet Address) to be parameters that |
43d9616c WD |
2075 | are set once by the board vendor / manufacturer, and |
2076 | protects these variables from casual modification by | |
2077 | the user. Once set, these variables are read-only, | |
2078 | and write or delete attempts are rejected. You can | |
11ccc33f | 2079 | change this behaviour: |
c609719b WD |
2080 | |
2081 | If CONFIG_ENV_OVERWRITE is #defined in your config | |
2082 | file, the write protection for vendor parameters is | |
47cd00fa | 2083 | completely disabled. Anybody can change or delete |
c609719b WD |
2084 | these parameters. |
2085 | ||
92ac5208 JH |
2086 | Alternatively, if you define _both_ an ethaddr in the |
2087 | default env _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default | |
11ccc33f | 2088 | Ethernet address is installed in the environment, |
c609719b WD |
2089 | which can be changed exactly ONCE by the user. [The |
2090 | serial# is unaffected by this, i. e. it remains | |
2091 | read-only.] | |
2092 | ||
2598090b JH |
2093 | The same can be accomplished in a more flexible way |
2094 | for any variable by configuring the type of access | |
2095 | to allow for those variables in the ".flags" variable | |
2096 | or define CONFIG_ENV_FLAGS_LIST_STATIC. | |
2097 | ||
c609719b WD |
2098 | - Protected RAM: |
2099 | CONFIG_PRAM | |
2100 | ||
2101 | Define this variable to enable the reservation of | |
2102 | "protected RAM", i. e. RAM which is not overwritten | |
2103 | by U-Boot. Define CONFIG_PRAM to hold the number of | |
2104 | kB you want to reserve for pRAM. You can overwrite | |
2105 | this default value by defining an environment | |
2106 | variable "pram" to the number of kB you want to | |
2107 | reserve. Note that the board info structure will | |
2108 | still show the full amount of RAM. If pRAM is | |
2109 | reserved, a new environment variable "mem" will | |
2110 | automatically be defined to hold the amount of | |
2111 | remaining RAM in a form that can be passed as boot | |
2112 | argument to Linux, for instance like that: | |
2113 | ||
fe126d8b | 2114 | setenv bootargs ... mem=\${mem} |
c609719b WD |
2115 | saveenv |
2116 | ||
2117 | This way you can tell Linux not to use this memory, | |
2118 | either, which results in a memory region that will | |
2119 | not be affected by reboots. | |
2120 | ||
2121 | *WARNING* If your board configuration uses automatic | |
2122 | detection of the RAM size, you must make sure that | |
2123 | this memory test is non-destructive. So far, the | |
2124 | following board configurations are known to be | |
2125 | "pRAM-clean": | |
2126 | ||
5b8e76c3 | 2127 | IVMS8, IVML24, SPD8xx, |
1b0757ec | 2128 | HERMES, IP860, RPXlite, LWMON, |
2eb48ff7 | 2129 | FLAGADM |
c609719b | 2130 | |
40fef049 GB |
2131 | - Access to physical memory region (> 4GB) |
2132 | Some basic support is provided for operations on memory not | |
2133 | normally accessible to U-Boot - e.g. some architectures | |
2134 | support access to more than 4GB of memory on 32-bit | |
2135 | machines using physical address extension or similar. | |
2136 | Define CONFIG_PHYSMEM to access this basic support, which | |
2137 | currently only supports clearing the memory. | |
2138 | ||
c609719b | 2139 | - Error Recovery: |
c609719b WD |
2140 | CONFIG_NET_RETRY_COUNT |
2141 | ||
43d9616c WD |
2142 | This variable defines the number of retries for |
2143 | network operations like ARP, RARP, TFTP, or BOOTP | |
2144 | before giving up the operation. If not defined, a | |
2145 | default value of 5 is used. | |
c609719b | 2146 | |
40cb90ee GL |
2147 | CONFIG_ARP_TIMEOUT |
2148 | ||
2149 | Timeout waiting for an ARP reply in milliseconds. | |
2150 | ||
48a3e999 TK |
2151 | CONFIG_NFS_TIMEOUT |
2152 | ||
2153 | Timeout in milliseconds used in NFS protocol. | |
2154 | If you encounter "ERROR: Cannot umount" in nfs command, | |
2155 | try longer timeout such as | |
2156 | #define CONFIG_NFS_TIMEOUT 10000UL | |
2157 | ||
c609719b | 2158 | - Command Interpreter: |
6d0f6bcf | 2159 | CONFIG_SYS_PROMPT_HUSH_PS2 |
c609719b WD |
2160 | |
2161 | This defines the secondary prompt string, which is | |
2162 | printed when the command interpreter needs more input | |
2163 | to complete a command. Usually "> ". | |
2164 | ||
2165 | Note: | |
2166 | ||
8bde7f77 WD |
2167 | In the current implementation, the local variables |
2168 | space and global environment variables space are | |
2169 | separated. Local variables are those you define by | |
2170 | simply typing `name=value'. To access a local | |
2171 | variable later on, you have write `$name' or | |
2172 | `${name}'; to execute the contents of a variable | |
2173 | directly type `$name' at the command prompt. | |
c609719b | 2174 | |
43d9616c WD |
2175 | Global environment variables are those you use |
2176 | setenv/printenv to work with. To run a command stored | |
2177 | in such a variable, you need to use the run command, | |
2178 | and you must not use the '$' sign to access them. | |
c609719b WD |
2179 | |
2180 | To store commands and special characters in a | |
2181 | variable, please use double quotation marks | |
2182 | surrounding the whole text of the variable, instead | |
2183 | of the backslashes before semicolons and special | |
2184 | symbols. | |
2185 | ||
b445bbb4 | 2186 | - Command Line Editing and History: |
f3b267b3 MV |
2187 | CONFIG_CMDLINE_PS_SUPPORT |
2188 | ||
2189 | Enable support for changing the command prompt string | |
2190 | at run-time. Only static string is supported so far. | |
2191 | The string is obtained from environment variables PS1 | |
2192 | and PS2. | |
2193 | ||
a8c7c708 | 2194 | - Default Environment: |
c609719b WD |
2195 | CONFIG_EXTRA_ENV_SETTINGS |
2196 | ||
43d9616c WD |
2197 | Define this to contain any number of null terminated |
2198 | strings (variable = value pairs) that will be part of | |
7152b1d0 | 2199 | the default environment compiled into the boot image. |
2262cfee | 2200 | |
43d9616c WD |
2201 | For example, place something like this in your |
2202 | board's config file: | |
c609719b WD |
2203 | |
2204 | #define CONFIG_EXTRA_ENV_SETTINGS \ | |
2205 | "myvar1=value1\0" \ | |
2206 | "myvar2=value2\0" | |
2207 | ||
43d9616c WD |
2208 | Warning: This method is based on knowledge about the |
2209 | internal format how the environment is stored by the | |
2210 | U-Boot code. This is NOT an official, exported | |
2211 | interface! Although it is unlikely that this format | |
7152b1d0 | 2212 | will change soon, there is no guarantee either. |
c609719b WD |
2213 | You better know what you are doing here. |
2214 | ||
43d9616c WD |
2215 | Note: overly (ab)use of the default environment is |
2216 | discouraged. Make sure to check other ways to preset | |
74de7aef | 2217 | the environment like the "source" command or the |
43d9616c | 2218 | boot command first. |
c609719b | 2219 | |
7e27f89f TR |
2220 | CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG |
2221 | ||
2222 | Define this in order to add variables describing certain | |
2223 | run-time determined information about the hardware to the | |
2224 | environment. These will be named board_name, board_rev. | |
2225 | ||
06fd8538 SG |
2226 | CONFIG_DELAY_ENVIRONMENT |
2227 | ||
2228 | Normally the environment is loaded when the board is | |
b445bbb4 | 2229 | initialised so that it is available to U-Boot. This inhibits |
06fd8538 SG |
2230 | that so that the environment is not available until |
2231 | explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL | |
2232 | this is instead controlled by the value of | |
2233 | /config/load-environment. | |
2234 | ||
f61ec45e | 2235 | - Serial Flash support |
00fd59dd | 2236 | Usage requires an initial 'sf probe' to define the serial |
f61ec45e EN |
2237 | flash parameters, followed by read/write/erase/update |
2238 | commands. | |
2239 | ||
2240 | The following defaults may be provided by the platform | |
2241 | to handle the common case when only a single serial | |
2242 | flash is present on the system. | |
2243 | ||
2244 | CONFIG_SF_DEFAULT_BUS Bus identifier | |
2245 | CONFIG_SF_DEFAULT_CS Chip-select | |
2246 | CONFIG_SF_DEFAULT_MODE (see include/spi.h) | |
2247 | CONFIG_SF_DEFAULT_SPEED in Hz | |
2248 | ||
3f85ce27 | 2249 | |
ecb0ccd9 WD |
2250 | - TFTP Fixed UDP Port: |
2251 | CONFIG_TFTP_PORT | |
2252 | ||
28cb9375 | 2253 | If this is defined, the environment variable tftpsrcp |
ecb0ccd9 | 2254 | is used to supply the TFTP UDP source port value. |
28cb9375 | 2255 | If tftpsrcp isn't defined, the normal pseudo-random port |
ecb0ccd9 WD |
2256 | number generator is used. |
2257 | ||
28cb9375 WD |
2258 | Also, the environment variable tftpdstp is used to supply |
2259 | the TFTP UDP destination port value. If tftpdstp isn't | |
2260 | defined, the normal port 69 is used. | |
2261 | ||
2262 | The purpose for tftpsrcp is to allow a TFTP server to | |
ecb0ccd9 WD |
2263 | blindly start the TFTP transfer using the pre-configured |
2264 | target IP address and UDP port. This has the effect of | |
2265 | "punching through" the (Windows XP) firewall, allowing | |
2266 | the remainder of the TFTP transfer to proceed normally. | |
2267 | A better solution is to properly configure the firewall, | |
2268 | but sometimes that is not allowed. | |
2269 | ||
9e50c406 | 2270 | - bootcount support: |
9e50c406 HS |
2271 | CONFIG_AT91SAM9XE |
2272 | enable special bootcounter support on at91sam9xe based boards. | |
9e50c406 HS |
2273 | CONFIG_BOOTCOUNT_RAM |
2274 | enable support for the bootcounter in RAM | |
2275 | CONFIG_BOOTCOUNT_I2C | |
2276 | enable support for the bootcounter on an i2c (like RTC) device. | |
2277 | CONFIG_SYS_I2C_RTC_ADDR = i2c chip address | |
2278 | CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for | |
2279 | the bootcounter. | |
2280 | CONFIG_BOOTCOUNT_ALEN = address len | |
f31dac4e IR |
2281 | CONFIG_BOOTCOUNT_EXT |
2282 | enable support for the bootcounter in EXT filesystem | |
2283 | CONFIG_SYS_BOOTCOUNT_ADDR = RAM address used for read | |
2284 | and write. | |
2285 | CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE = interface | |
2286 | CONFIG_SYS_BOOTCOUNT_EXT_DEVPART = device and part | |
2287 | CONFIG_SYS_BOOTCOUNT_EXT_NAME = filename | |
19c402af | 2288 | |
a8c7c708 | 2289 | - Show boot progress: |
c609719b WD |
2290 | CONFIG_SHOW_BOOT_PROGRESS |
2291 | ||
43d9616c WD |
2292 | Defining this option allows to add some board- |
2293 | specific code (calling a user-provided function | |
2294 | "show_boot_progress(int)") that enables you to show | |
2295 | the system's boot progress on some display (for | |
2296 | example, some LED's) on your board. At the moment, | |
2297 | the following checkpoints are implemented: | |
c609719b | 2298 | |
94fd1316 | 2299 | |
1372cce2 MB |
2300 | Legacy uImage format: |
2301 | ||
c609719b WD |
2302 | Arg Where When |
2303 | 1 common/cmd_bootm.c before attempting to boot an image | |
ba56f625 | 2304 | -1 common/cmd_bootm.c Image header has bad magic number |
c609719b | 2305 | 2 common/cmd_bootm.c Image header has correct magic number |
ba56f625 | 2306 | -2 common/cmd_bootm.c Image header has bad checksum |
c609719b | 2307 | 3 common/cmd_bootm.c Image header has correct checksum |
ba56f625 | 2308 | -3 common/cmd_bootm.c Image data has bad checksum |
c609719b WD |
2309 | 4 common/cmd_bootm.c Image data has correct checksum |
2310 | -4 common/cmd_bootm.c Image is for unsupported architecture | |
2311 | 5 common/cmd_bootm.c Architecture check OK | |
1372cce2 | 2312 | -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) |
c609719b WD |
2313 | 6 common/cmd_bootm.c Image Type check OK |
2314 | -6 common/cmd_bootm.c gunzip uncompression error | |
2315 | -7 common/cmd_bootm.c Unimplemented compression type | |
2316 | 7 common/cmd_bootm.c Uncompression OK | |
1372cce2 | 2317 | 8 common/cmd_bootm.c No uncompress/copy overwrite error |
c609719b | 2318 | -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) |
1372cce2 MB |
2319 | |
2320 | 9 common/image.c Start initial ramdisk verification | |
2321 | -10 common/image.c Ramdisk header has bad magic number | |
2322 | -11 common/image.c Ramdisk header has bad checksum | |
2323 | 10 common/image.c Ramdisk header is OK | |
2324 | -12 common/image.c Ramdisk data has bad checksum | |
2325 | 11 common/image.c Ramdisk data has correct checksum | |
2326 | 12 common/image.c Ramdisk verification complete, start loading | |
11ccc33f | 2327 | -13 common/image.c Wrong Image Type (not PPC Linux ramdisk) |
1372cce2 MB |
2328 | 13 common/image.c Start multifile image verification |
2329 | 14 common/image.c No initial ramdisk, no multifile, continue. | |
2330 | ||
c0f40859 | 2331 | 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS |
c609719b | 2332 | |
a47a12be | 2333 | -30 arch/powerpc/lib/board.c Fatal error, hang the system |
11dadd54 WD |
2334 | -31 post/post.c POST test failed, detected by post_output_backlog() |
2335 | -32 post/post.c POST test failed, detected by post_run_single() | |
63e73c9a | 2336 | |
566a494f HS |
2337 | 34 common/cmd_doc.c before loading a Image from a DOC device |
2338 | -35 common/cmd_doc.c Bad usage of "doc" command | |
2339 | 35 common/cmd_doc.c correct usage of "doc" command | |
2340 | -36 common/cmd_doc.c No boot device | |
2341 | 36 common/cmd_doc.c correct boot device | |
2342 | -37 common/cmd_doc.c Unknown Chip ID on boot device | |
2343 | 37 common/cmd_doc.c correct chip ID found, device available | |
2344 | -38 common/cmd_doc.c Read Error on boot device | |
2345 | 38 common/cmd_doc.c reading Image header from DOC device OK | |
2346 | -39 common/cmd_doc.c Image header has bad magic number | |
2347 | 39 common/cmd_doc.c Image header has correct magic number | |
2348 | -40 common/cmd_doc.c Error reading Image from DOC device | |
2349 | 40 common/cmd_doc.c Image header has correct magic number | |
2350 | 41 common/cmd_ide.c before loading a Image from a IDE device | |
2351 | -42 common/cmd_ide.c Bad usage of "ide" command | |
2352 | 42 common/cmd_ide.c correct usage of "ide" command | |
2353 | -43 common/cmd_ide.c No boot device | |
2354 | 43 common/cmd_ide.c boot device found | |
2355 | -44 common/cmd_ide.c Device not available | |
2356 | 44 common/cmd_ide.c Device available | |
2357 | -45 common/cmd_ide.c wrong partition selected | |
2358 | 45 common/cmd_ide.c partition selected | |
2359 | -46 common/cmd_ide.c Unknown partition table | |
2360 | 46 common/cmd_ide.c valid partition table found | |
2361 | -47 common/cmd_ide.c Invalid partition type | |
2362 | 47 common/cmd_ide.c correct partition type | |
2363 | -48 common/cmd_ide.c Error reading Image Header on boot device | |
2364 | 48 common/cmd_ide.c reading Image Header from IDE device OK | |
2365 | -49 common/cmd_ide.c Image header has bad magic number | |
2366 | 49 common/cmd_ide.c Image header has correct magic number | |
2367 | -50 common/cmd_ide.c Image header has bad checksum | |
2368 | 50 common/cmd_ide.c Image header has correct checksum | |
2369 | -51 common/cmd_ide.c Error reading Image from IDE device | |
2370 | 51 common/cmd_ide.c reading Image from IDE device OK | |
2371 | 52 common/cmd_nand.c before loading a Image from a NAND device | |
2372 | -53 common/cmd_nand.c Bad usage of "nand" command | |
2373 | 53 common/cmd_nand.c correct usage of "nand" command | |
2374 | -54 common/cmd_nand.c No boot device | |
2375 | 54 common/cmd_nand.c boot device found | |
2376 | -55 common/cmd_nand.c Unknown Chip ID on boot device | |
2377 | 55 common/cmd_nand.c correct chip ID found, device available | |
2378 | -56 common/cmd_nand.c Error reading Image Header on boot device | |
2379 | 56 common/cmd_nand.c reading Image Header from NAND device OK | |
2380 | -57 common/cmd_nand.c Image header has bad magic number | |
2381 | 57 common/cmd_nand.c Image header has correct magic number | |
2382 | -58 common/cmd_nand.c Error reading Image from NAND device | |
2383 | 58 common/cmd_nand.c reading Image from NAND device OK | |
2384 | ||
2385 | -60 common/env_common.c Environment has a bad CRC, using default | |
2386 | ||
11ccc33f | 2387 | 64 net/eth.c starting with Ethernet configuration. |
566a494f HS |
2388 | -64 net/eth.c no Ethernet found. |
2389 | 65 net/eth.c Ethernet found. | |
2390 | ||
2391 | -80 common/cmd_net.c usage wrong | |
bc0571fc JH |
2392 | 80 common/cmd_net.c before calling net_loop() |
2393 | -81 common/cmd_net.c some error in net_loop() occurred | |
2394 | 81 common/cmd_net.c net_loop() back without error | |
566a494f HS |
2395 | -82 common/cmd_net.c size == 0 (File with size 0 loaded) |
2396 | 82 common/cmd_net.c trying automatic boot | |
74de7aef WD |
2397 | 83 common/cmd_net.c running "source" command |
2398 | -83 common/cmd_net.c some error in automatic boot or "source" command | |
566a494f | 2399 | 84 common/cmd_net.c end without errors |
c609719b | 2400 | |
1372cce2 MB |
2401 | FIT uImage format: |
2402 | ||
2403 | Arg Where When | |
2404 | 100 common/cmd_bootm.c Kernel FIT Image has correct format | |
2405 | -100 common/cmd_bootm.c Kernel FIT Image has incorrect format | |
2406 | 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration | |
2407 | -101 common/cmd_bootm.c Can't get configuration for kernel subimage | |
2408 | 102 common/cmd_bootm.c Kernel unit name specified | |
2409 | -103 common/cmd_bootm.c Can't get kernel subimage node offset | |
f773bea8 | 2410 | 103 common/cmd_bootm.c Found configuration node |
1372cce2 MB |
2411 | 104 common/cmd_bootm.c Got kernel subimage node offset |
2412 | -104 common/cmd_bootm.c Kernel subimage hash verification failed | |
2413 | 105 common/cmd_bootm.c Kernel subimage hash verification OK | |
2414 | -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture | |
2415 | 106 common/cmd_bootm.c Architecture check OK | |
11ccc33f MZ |
2416 | -106 common/cmd_bootm.c Kernel subimage has wrong type |
2417 | 107 common/cmd_bootm.c Kernel subimage type OK | |
1372cce2 MB |
2418 | -107 common/cmd_bootm.c Can't get kernel subimage data/size |
2419 | 108 common/cmd_bootm.c Got kernel subimage data/size | |
2420 | -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) | |
2421 | -109 common/cmd_bootm.c Can't get kernel subimage type | |
2422 | -110 common/cmd_bootm.c Can't get kernel subimage comp | |
2423 | -111 common/cmd_bootm.c Can't get kernel subimage os | |
2424 | -112 common/cmd_bootm.c Can't get kernel subimage load address | |
2425 | -113 common/cmd_bootm.c Image uncompress/copy overwrite error | |
2426 | ||
2427 | 120 common/image.c Start initial ramdisk verification | |
2428 | -120 common/image.c Ramdisk FIT image has incorrect format | |
2429 | 121 common/image.c Ramdisk FIT image has correct format | |
11ccc33f | 2430 | 122 common/image.c No ramdisk subimage unit name, using configuration |
1372cce2 MB |
2431 | -122 common/image.c Can't get configuration for ramdisk subimage |
2432 | 123 common/image.c Ramdisk unit name specified | |
2433 | -124 common/image.c Can't get ramdisk subimage node offset | |
2434 | 125 common/image.c Got ramdisk subimage node offset | |
2435 | -125 common/image.c Ramdisk subimage hash verification failed | |
2436 | 126 common/image.c Ramdisk subimage hash verification OK | |
2437 | -126 common/image.c Ramdisk subimage for unsupported architecture | |
2438 | 127 common/image.c Architecture check OK | |
2439 | -127 common/image.c Can't get ramdisk subimage data/size | |
2440 | 128 common/image.c Got ramdisk subimage data/size | |
2441 | 129 common/image.c Can't get ramdisk load address | |
2442 | -129 common/image.c Got ramdisk load address | |
2443 | ||
11ccc33f | 2444 | -130 common/cmd_doc.c Incorrect FIT image format |
1372cce2 MB |
2445 | 131 common/cmd_doc.c FIT image format OK |
2446 | ||
11ccc33f | 2447 | -140 common/cmd_ide.c Incorrect FIT image format |
1372cce2 MB |
2448 | 141 common/cmd_ide.c FIT image format OK |
2449 | ||
11ccc33f | 2450 | -150 common/cmd_nand.c Incorrect FIT image format |
1372cce2 MB |
2451 | 151 common/cmd_nand.c FIT image format OK |
2452 | ||
21d29f7f HS |
2453 | - legacy image format: |
2454 | CONFIG_IMAGE_FORMAT_LEGACY | |
2455 | enables the legacy image format support in U-Boot. | |
2456 | ||
2457 | Default: | |
2458 | enabled if CONFIG_FIT_SIGNATURE is not defined. | |
2459 | ||
2460 | CONFIG_DISABLE_IMAGE_LEGACY | |
2461 | disable the legacy image format | |
2462 | ||
2463 | This define is introduced, as the legacy image format is | |
2464 | enabled per default for backward compatibility. | |
2465 | ||
4cf2609b WD |
2466 | - Standalone program support: |
2467 | CONFIG_STANDALONE_LOAD_ADDR | |
2468 | ||
6feff899 WD |
2469 | This option defines a board specific value for the |
2470 | address where standalone program gets loaded, thus | |
2471 | overwriting the architecture dependent default | |
4cf2609b WD |
2472 | settings. |
2473 | ||
2474 | - Frame Buffer Address: | |
2475 | CONFIG_FB_ADDR | |
2476 | ||
2477 | Define CONFIG_FB_ADDR if you want to use specific | |
44a53b57 WD |
2478 | address for frame buffer. This is typically the case |
2479 | when using a graphics controller has separate video | |
2480 | memory. U-Boot will then place the frame buffer at | |
2481 | the given address instead of dynamically reserving it | |
2482 | in system RAM by calling lcd_setmem(), which grabs | |
2483 | the memory for the frame buffer depending on the | |
2484 | configured panel size. | |
4cf2609b WD |
2485 | |
2486 | Please see board_init_f function. | |
2487 | ||
cccfc2ab DZ |
2488 | - Automatic software updates via TFTP server |
2489 | CONFIG_UPDATE_TFTP | |
2490 | CONFIG_UPDATE_TFTP_CNT_MAX | |
2491 | CONFIG_UPDATE_TFTP_MSEC_MAX | |
2492 | ||
2493 | These options enable and control the auto-update feature; | |
2494 | for a more detailed description refer to doc/README.update. | |
2495 | ||
2496 | - MTD Support (mtdparts command, UBI support) | |
2497 | CONFIG_MTD_DEVICE | |
2498 | ||
2499 | Adds the MTD device infrastructure from the Linux kernel. | |
2500 | Needed for mtdparts command support. | |
2501 | ||
2502 | CONFIG_MTD_PARTITIONS | |
2503 | ||
2504 | Adds the MTD partitioning infrastructure from the Linux | |
2505 | kernel. Needed for UBI support. | |
2506 | ||
70c219cd | 2507 | - UBI support |
147162da JH |
2508 | CONFIG_UBI_SILENCE_MSG |
2509 | ||
2510 | Make the verbose messages from UBI stop printing. This leaves | |
2511 | warnings and errors enabled. | |
2512 | ||
ff94bc40 HS |
2513 | |
2514 | CONFIG_MTD_UBI_WL_THRESHOLD | |
2515 | This parameter defines the maximum difference between the highest | |
2516 | erase counter value and the lowest erase counter value of eraseblocks | |
2517 | of UBI devices. When this threshold is exceeded, UBI starts performing | |
2518 | wear leveling by means of moving data from eraseblock with low erase | |
2519 | counter to eraseblocks with high erase counter. | |
2520 | ||
2521 | The default value should be OK for SLC NAND flashes, NOR flashes and | |
2522 | other flashes which have eraseblock life-cycle 100000 or more. | |
2523 | However, in case of MLC NAND flashes which typically have eraseblock | |
2524 | life-cycle less than 10000, the threshold should be lessened (e.g., | |
2525 | to 128 or 256, although it does not have to be power of 2). | |
2526 | ||
2527 | default: 4096 | |
c654b517 | 2528 | |
ff94bc40 HS |
2529 | CONFIG_MTD_UBI_BEB_LIMIT |
2530 | This option specifies the maximum bad physical eraseblocks UBI | |
2531 | expects on the MTD device (per 1024 eraseblocks). If the | |
2532 | underlying flash does not admit of bad eraseblocks (e.g. NOR | |
2533 | flash), this value is ignored. | |
2534 | ||
2535 | NAND datasheets often specify the minimum and maximum NVM | |
2536 | (Number of Valid Blocks) for the flashes' endurance lifetime. | |
2537 | The maximum expected bad eraseblocks per 1024 eraseblocks | |
2538 | then can be calculated as "1024 * (1 - MinNVB / MaxNVB)", | |
2539 | which gives 20 for most NANDs (MaxNVB is basically the total | |
2540 | count of eraseblocks on the chip). | |
2541 | ||
2542 | To put it differently, if this value is 20, UBI will try to | |
2543 | reserve about 1.9% of physical eraseblocks for bad blocks | |
2544 | handling. And that will be 1.9% of eraseblocks on the entire | |
2545 | NAND chip, not just the MTD partition UBI attaches. This means | |
2546 | that if you have, say, a NAND flash chip admits maximum 40 bad | |
2547 | eraseblocks, and it is split on two MTD partitions of the same | |
2548 | size, UBI will reserve 40 eraseblocks when attaching a | |
2549 | partition. | |
2550 | ||
2551 | default: 20 | |
2552 | ||
2553 | CONFIG_MTD_UBI_FASTMAP | |
2554 | Fastmap is a mechanism which allows attaching an UBI device | |
2555 | in nearly constant time. Instead of scanning the whole MTD device it | |
2556 | only has to locate a checkpoint (called fastmap) on the device. | |
2557 | The on-flash fastmap contains all information needed to attach | |
2558 | the device. Using fastmap makes only sense on large devices where | |
2559 | attaching by scanning takes long. UBI will not automatically install | |
2560 | a fastmap on old images, but you can set the UBI parameter | |
2561 | CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT to 1 if you want so. Please note | |
2562 | that fastmap-enabled images are still usable with UBI implementations | |
2563 | without fastmap support. On typical flash devices the whole fastmap | |
2564 | fits into one PEB. UBI will reserve PEBs to hold two fastmaps. | |
2565 | ||
2566 | CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT | |
2567 | Set this parameter to enable fastmap automatically on images | |
2568 | without a fastmap. | |
2569 | default: 0 | |
2570 | ||
0195a7bb HS |
2571 | CONFIG_MTD_UBI_FM_DEBUG |
2572 | Enable UBI fastmap debug | |
2573 | default: 0 | |
2574 | ||
70c219cd | 2575 | - UBIFS support |
147162da JH |
2576 | CONFIG_UBIFS_SILENCE_MSG |
2577 | ||
2578 | Make the verbose messages from UBIFS stop printing. This leaves | |
2579 | warnings and errors enabled. | |
2580 | ||
6a11cf48 | 2581 | - SPL framework |
04e5ae79 WD |
2582 | CONFIG_SPL |
2583 | Enable building of SPL globally. | |
6a11cf48 | 2584 | |
95579793 TR |
2585 | CONFIG_SPL_LDSCRIPT |
2586 | LDSCRIPT for linking the SPL binary. | |
2587 | ||
6ebc3461 AA |
2588 | CONFIG_SPL_MAX_FOOTPRINT |
2589 | Maximum size in memory allocated to the SPL, BSS included. | |
2590 | When defined, the linker checks that the actual memory | |
2591 | used by SPL from _start to __bss_end does not exceed it. | |
8960af8b | 2592 | CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE |
6ebc3461 AA |
2593 | must not be both defined at the same time. |
2594 | ||
95579793 | 2595 | CONFIG_SPL_MAX_SIZE |
6ebc3461 AA |
2596 | Maximum size of the SPL image (text, data, rodata, and |
2597 | linker lists sections), BSS excluded. | |
2598 | When defined, the linker checks that the actual size does | |
2599 | not exceed it. | |
95579793 | 2600 | |
04e5ae79 WD |
2601 | CONFIG_SPL_TEXT_BASE |
2602 | TEXT_BASE for linking the SPL binary. | |
6a11cf48 | 2603 | |
94a45bb1 SW |
2604 | CONFIG_SPL_RELOC_TEXT_BASE |
2605 | Address to relocate to. If unspecified, this is equal to | |
2606 | CONFIG_SPL_TEXT_BASE (i.e. no relocation is done). | |
2607 | ||
95579793 TR |
2608 | CONFIG_SPL_BSS_START_ADDR |
2609 | Link address for the BSS within the SPL binary. | |
2610 | ||
2611 | CONFIG_SPL_BSS_MAX_SIZE | |
6ebc3461 AA |
2612 | Maximum size in memory allocated to the SPL BSS. |
2613 | When defined, the linker checks that the actual memory used | |
2614 | by SPL from __bss_start to __bss_end does not exceed it. | |
8960af8b | 2615 | CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE |
6ebc3461 | 2616 | must not be both defined at the same time. |
95579793 TR |
2617 | |
2618 | CONFIG_SPL_STACK | |
2619 | Adress of the start of the stack SPL will use | |
2620 | ||
8c80eb3b AA |
2621 | CONFIG_SPL_PANIC_ON_RAW_IMAGE |
2622 | When defined, SPL will panic() if the image it has | |
2623 | loaded does not have a signature. | |
2624 | Defining this is useful when code which loads images | |
2625 | in SPL cannot guarantee that absolutely all read errors | |
2626 | will be caught. | |
2627 | An example is the LPC32XX MLC NAND driver, which will | |
2628 | consider that a completely unreadable NAND block is bad, | |
2629 | and thus should be skipped silently. | |
2630 | ||
94a45bb1 SW |
2631 | CONFIG_SPL_RELOC_STACK |
2632 | Adress of the start of the stack SPL will use after | |
2633 | relocation. If unspecified, this is equal to | |
2634 | CONFIG_SPL_STACK. | |
2635 | ||
95579793 TR |
2636 | CONFIG_SYS_SPL_MALLOC_START |
2637 | Starting address of the malloc pool used in SPL. | |
9ac4fc82 FE |
2638 | When this option is set the full malloc is used in SPL and |
2639 | it is set up by spl_init() and before that, the simple malloc() | |
2640 | can be used if CONFIG_SYS_MALLOC_F is defined. | |
95579793 TR |
2641 | |
2642 | CONFIG_SYS_SPL_MALLOC_SIZE | |
2643 | The size of the malloc pool used in SPL. | |
6a11cf48 | 2644 | |
9607faf2 TR |
2645 | CONFIG_SPL_OS_BOOT |
2646 | Enable booting directly to an OS from SPL. | |
2647 | See also: doc/README.falcon | |
2648 | ||
861a86f4 TR |
2649 | CONFIG_SPL_DISPLAY_PRINT |
2650 | For ARM, enable an optional function to print more information | |
2651 | about the running system. | |
2652 | ||
4b919725 SW |
2653 | CONFIG_SPL_INIT_MINIMAL |
2654 | Arch init code should be built for a very small image | |
2655 | ||
b97300b6 PK |
2656 | CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION |
2657 | Partition on the MMC to load U-Boot from when the MMC is being | |
2658 | used in raw mode | |
2659 | ||
2b75b0ad PK |
2660 | CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR |
2661 | Sector to load kernel uImage from when MMC is being | |
2662 | used in raw mode (for Falcon mode) | |
2663 | ||
2664 | CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR, | |
2665 | CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS | |
2666 | Sector and number of sectors to load kernel argument | |
2667 | parameters from when MMC is being used in raw mode | |
2668 | (for falcon mode) | |
2669 | ||
e2ccdf89 PK |
2670 | CONFIG_SYS_MMCSD_FS_BOOT_PARTITION |
2671 | Partition on the MMC to load U-Boot from when the MMC is being | |
2672 | used in fs mode | |
2673 | ||
fae81c72 GG |
2674 | CONFIG_SPL_FS_LOAD_PAYLOAD_NAME |
2675 | Filename to read to load U-Boot when reading from filesystem | |
2676 | ||
2677 | CONFIG_SPL_FS_LOAD_KERNEL_NAME | |
7ad2cc79 | 2678 | Filename to read to load kernel uImage when reading |
fae81c72 | 2679 | from filesystem (for Falcon mode) |
7ad2cc79 | 2680 | |
fae81c72 | 2681 | CONFIG_SPL_FS_LOAD_ARGS_NAME |
7ad2cc79 | 2682 | Filename to read to load kernel argument parameters |
fae81c72 | 2683 | when reading from filesystem (for Falcon mode) |
7ad2cc79 | 2684 | |
06f60ae3 SW |
2685 | CONFIG_SPL_MPC83XX_WAIT_FOR_NAND |
2686 | Set this for NAND SPL on PPC mpc83xx targets, so that | |
2687 | start.S waits for the rest of the SPL to load before | |
2688 | continuing (the hardware starts execution after just | |
2689 | loading the first page rather than the full 4K). | |
2690 | ||
651fcf60 PK |
2691 | CONFIG_SPL_SKIP_RELOCATE |
2692 | Avoid SPL relocation | |
2693 | ||
6f2f01b9 SW |
2694 | CONFIG_SPL_NAND_BASE |
2695 | Include nand_base.c in the SPL. Requires | |
2696 | CONFIG_SPL_NAND_DRIVERS. | |
2697 | ||
2698 | CONFIG_SPL_NAND_DRIVERS | |
2699 | SPL uses normal NAND drivers, not minimal drivers. | |
2700 | ||
2701 | CONFIG_SPL_NAND_ECC | |
2702 | Include standard software ECC in the SPL | |
2703 | ||
95579793 | 2704 | CONFIG_SPL_NAND_SIMPLE |
7d4b7955 SW |
2705 | Support for NAND boot using simple NAND drivers that |
2706 | expose the cmd_ctrl() interface. | |
95579793 | 2707 | |
6f4e7d3c TG |
2708 | CONFIG_SPL_UBI |
2709 | Support for a lightweight UBI (fastmap) scanner and | |
2710 | loader | |
2711 | ||
0c3117b1 HS |
2712 | CONFIG_SPL_NAND_RAW_ONLY |
2713 | Support to boot only raw u-boot.bin images. Use this only | |
2714 | if you need to save space. | |
2715 | ||
7c8eea59 YZ |
2716 | CONFIG_SPL_COMMON_INIT_DDR |
2717 | Set for common ddr init with serial presence detect in | |
2718 | SPL binary. | |
2719 | ||
95579793 TR |
2720 | CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT, |
2721 | CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE, | |
2722 | CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS, | |
2723 | CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE, | |
2724 | CONFIG_SYS_NAND_ECCBYTES | |
2725 | Defines the size and behavior of the NAND that SPL uses | |
7d4b7955 | 2726 | to read U-Boot |
95579793 | 2727 | |
fbe76ae4 PK |
2728 | CONFIG_SPL_NAND_BOOT |
2729 | Add support NAND boot | |
2730 | ||
95579793 | 2731 | CONFIG_SYS_NAND_U_BOOT_OFFS |
7d4b7955 SW |
2732 | Location in NAND to read U-Boot from |
2733 | ||
2734 | CONFIG_SYS_NAND_U_BOOT_DST | |
2735 | Location in memory to load U-Boot to | |
2736 | ||
2737 | CONFIG_SYS_NAND_U_BOOT_SIZE | |
2738 | Size of image to load | |
95579793 TR |
2739 | |
2740 | CONFIG_SYS_NAND_U_BOOT_START | |
7d4b7955 | 2741 | Entry point in loaded image to jump to |
95579793 TR |
2742 | |
2743 | CONFIG_SYS_NAND_HW_ECC_OOBFIRST | |
2744 | Define this if you need to first read the OOB and then the | |
b445bbb4 | 2745 | data. This is used, for example, on davinci platforms. |
95579793 | 2746 | |
c57b953d PM |
2747 | CONFIG_SPL_RAM_DEVICE |
2748 | Support for running image already present in ram, in SPL binary | |
6a11cf48 | 2749 | |
74752baa | 2750 | CONFIG_SPL_PAD_TO |
6113d3f2 BT |
2751 | Image offset to which the SPL should be padded before appending |
2752 | the SPL payload. By default, this is defined as | |
2753 | CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. | |
2754 | CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL | |
2755 | payload without any padding, or >= CONFIG_SPL_MAX_SIZE. | |
74752baa | 2756 | |
ca2fca22 SW |
2757 | CONFIG_SPL_TARGET |
2758 | Final target image containing SPL and payload. Some SPLs | |
2759 | use an arch-specific makefile fragment instead, for | |
2760 | example if more than one image needs to be produced. | |
2761 | ||
87ebee39 SG |
2762 | CONFIG_FIT_SPL_PRINT |
2763 | Printing information about a FIT image adds quite a bit of | |
2764 | code to SPL. So this is normally disabled in SPL. Use this | |
2765 | option to re-enable it. This will affect the output of the | |
2766 | bootm command when booting a FIT image. | |
2767 | ||
3aa29de0 YZ |
2768 | - TPL framework |
2769 | CONFIG_TPL | |
2770 | Enable building of TPL globally. | |
2771 | ||
2772 | CONFIG_TPL_PAD_TO | |
2773 | Image offset to which the TPL should be padded before appending | |
2774 | the TPL payload. By default, this is defined as | |
93e14596 WD |
2775 | CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. |
2776 | CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL | |
2777 | payload without any padding, or >= CONFIG_SPL_MAX_SIZE. | |
3aa29de0 | 2778 | |
a8c7c708 WD |
2779 | - Interrupt support (PPC): |
2780 | ||
d4ca31c4 WD |
2781 | There are common interrupt_init() and timer_interrupt() |
2782 | for all PPC archs. interrupt_init() calls interrupt_init_cpu() | |
11ccc33f | 2783 | for CPU specific initialization. interrupt_init_cpu() |
d4ca31c4 | 2784 | should set decrementer_count to appropriate value. If |
11ccc33f | 2785 | CPU resets decrementer automatically after interrupt |
d4ca31c4 | 2786 | (ppc4xx) it should set decrementer_count to zero. |
11ccc33f | 2787 | timer_interrupt() calls timer_interrupt_cpu() for CPU |
d4ca31c4 WD |
2788 | specific handling. If board has watchdog / status_led |
2789 | / other_activity_monitor it works automatically from | |
2790 | general timer_interrupt(). | |
a8c7c708 | 2791 | |
c609719b | 2792 | |
9660e442 HR |
2793 | Board initialization settings: |
2794 | ------------------------------ | |
2795 | ||
2796 | During Initialization u-boot calls a number of board specific functions | |
2797 | to allow the preparation of board specific prerequisites, e.g. pin setup | |
2798 | before drivers are initialized. To enable these callbacks the | |
2799 | following configuration macros have to be defined. Currently this is | |
2800 | architecture specific, so please check arch/your_architecture/lib/board.c | |
2801 | typically in board_init_f() and board_init_r(). | |
2802 | ||
2803 | - CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f() | |
2804 | - CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r() | |
2805 | - CONFIG_BOARD_LATE_INIT: Call board_late_init() | |
2806 | - CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init() | |
c609719b | 2807 | |
c609719b WD |
2808 | Configuration Settings: |
2809 | ----------------------- | |
2810 | ||
4d1fd7f1 YS |
2811 | - CONFIG_SYS_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit. |
2812 | Optionally it can be defined to support 64-bit memory commands. | |
2813 | ||
6d0f6bcf | 2814 | - CONFIG_SYS_LONGHELP: Defined when you want long help messages included; |
c609719b WD |
2815 | undefine this when you're short of memory. |
2816 | ||
2fb2604d PT |
2817 | - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default |
2818 | width of the commands listed in the 'help' command output. | |
2819 | ||
6d0f6bcf | 2820 | - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to |
c609719b WD |
2821 | prompt for user input. |
2822 | ||
6d0f6bcf | 2823 | - CONFIG_SYS_CBSIZE: Buffer size for input from the Console |
c609719b | 2824 | |
6d0f6bcf | 2825 | - CONFIG_SYS_PBSIZE: Buffer size for Console output |
c609719b | 2826 | |
6d0f6bcf | 2827 | - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands |
c609719b | 2828 | |
6d0f6bcf | 2829 | - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to |
c609719b WD |
2830 | the application (usually a Linux kernel) when it is |
2831 | booted | |
2832 | ||
6d0f6bcf | 2833 | - CONFIG_SYS_BAUDRATE_TABLE: |
c609719b WD |
2834 | List of legal baudrate settings for this board. |
2835 | ||
6d0f6bcf | 2836 | - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: |
c609719b WD |
2837 | Begin and End addresses of the area used by the |
2838 | simple memory test. | |
2839 | ||
6d0f6bcf | 2840 | - CONFIG_SYS_ALT_MEMTEST: |
8bde7f77 | 2841 | Enable an alternate, more extensive memory test. |
c609719b | 2842 | |
6d0f6bcf | 2843 | - CONFIG_SYS_MEMTEST_SCRATCH: |
5f535fe1 WD |
2844 | Scratch address used by the alternate memory test |
2845 | You only need to set this if address zero isn't writeable | |
2846 | ||
e8149522 | 2847 | - CONFIG_SYS_MEM_RESERVE_SECURE |
e61a7534 | 2848 | Only implemented for ARMv8 for now. |
e8149522 YS |
2849 | If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory |
2850 | is substracted from total RAM and won't be reported to OS. | |
2851 | This memory can be used as secure memory. A variable | |
e61a7534 | 2852 | gd->arch.secure_ram is used to track the location. In systems |
e8149522 YS |
2853 | the RAM base is not zero, or RAM is divided into banks, |
2854 | this variable needs to be recalcuated to get the address. | |
2855 | ||
aabd7ddb | 2856 | - CONFIG_SYS_MEM_TOP_HIDE: |
6d0f6bcf | 2857 | If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, |
14f73ca6 | 2858 | this specified memory area will get subtracted from the top |
11ccc33f | 2859 | (end) of RAM and won't get "touched" at all by U-Boot. By |
14f73ca6 SR |
2860 | fixing up gd->ram_size the Linux kernel should gets passed |
2861 | the now "corrected" memory size and won't touch it either. | |
2862 | This should work for arch/ppc and arch/powerpc. Only Linux | |
5e12e75d | 2863 | board ports in arch/powerpc with bootwrapper support that |
14f73ca6 | 2864 | recalculate the memory size from the SDRAM controller setup |
5e12e75d | 2865 | will have to get fixed in Linux additionally. |
14f73ca6 SR |
2866 | |
2867 | This option can be used as a workaround for the 440EPx/GRx | |
2868 | CHIP 11 errata where the last 256 bytes in SDRAM shouldn't | |
2869 | be touched. | |
2870 | ||
2871 | WARNING: Please make sure that this value is a multiple of | |
2872 | the Linux page size (normally 4k). If this is not the case, | |
2873 | then the end address of the Linux memory will be located at a | |
2874 | non page size aligned address and this could cause major | |
2875 | problems. | |
2876 | ||
6d0f6bcf | 2877 | - CONFIG_SYS_LOADS_BAUD_CHANGE: |
c609719b WD |
2878 | Enable temporary baudrate change while serial download |
2879 | ||
6d0f6bcf | 2880 | - CONFIG_SYS_SDRAM_BASE: |
c609719b WD |
2881 | Physical start address of SDRAM. _Must_ be 0 here. |
2882 | ||
6d0f6bcf | 2883 | - CONFIG_SYS_FLASH_BASE: |
c609719b WD |
2884 | Physical start address of Flash memory. |
2885 | ||
6d0f6bcf | 2886 | - CONFIG_SYS_MONITOR_BASE: |
c609719b WD |
2887 | Physical start address of boot monitor code (set by |
2888 | make config files to be same as the text base address | |
14d0a02a | 2889 | (CONFIG_SYS_TEXT_BASE) used when linking) - same as |
6d0f6bcf | 2890 | CONFIG_SYS_FLASH_BASE when booting from flash. |
c609719b | 2891 | |
6d0f6bcf | 2892 | - CONFIG_SYS_MONITOR_LEN: |
8bde7f77 WD |
2893 | Size of memory reserved for monitor code, used to |
2894 | determine _at_compile_time_ (!) if the environment is | |
2895 | embedded within the U-Boot image, or in a separate | |
2896 | flash sector. | |
c609719b | 2897 | |
6d0f6bcf | 2898 | - CONFIG_SYS_MALLOC_LEN: |
c609719b WD |
2899 | Size of DRAM reserved for malloc() use. |
2900 | ||
d59476b6 SG |
2901 | - CONFIG_SYS_MALLOC_F_LEN |
2902 | Size of the malloc() pool for use before relocation. If | |
2903 | this is defined, then a very simple malloc() implementation | |
2904 | will become available before relocation. The address is just | |
2905 | below the global data, and the stack is moved down to make | |
2906 | space. | |
2907 | ||
2908 | This feature allocates regions with increasing addresses | |
2909 | within the region. calloc() is supported, but realloc() | |
2910 | is not available. free() is supported but does nothing. | |
b445bbb4 | 2911 | The memory will be freed (or in fact just forgotten) when |
d59476b6 SG |
2912 | U-Boot relocates itself. |
2913 | ||
38687ae6 SG |
2914 | - CONFIG_SYS_MALLOC_SIMPLE |
2915 | Provides a simple and small malloc() and calloc() for those | |
2916 | boards which do not use the full malloc in SPL (which is | |
2917 | enabled with CONFIG_SYS_SPL_MALLOC_START). | |
2918 | ||
1dfdd9ba TR |
2919 | - CONFIG_SYS_NONCACHED_MEMORY: |
2920 | Size of non-cached memory area. This area of memory will be | |
2921 | typically located right below the malloc() area and mapped | |
2922 | uncached in the MMU. This is useful for drivers that would | |
2923 | otherwise require a lot of explicit cache maintenance. For | |
2924 | some drivers it's also impossible to properly maintain the | |
2925 | cache. For example if the regions that need to be flushed | |
2926 | are not a multiple of the cache-line size, *and* padding | |
2927 | cannot be allocated between the regions to align them (i.e. | |
2928 | if the HW requires a contiguous array of regions, and the | |
2929 | size of each region is not cache-aligned), then a flush of | |
2930 | one region may result in overwriting data that hardware has | |
2931 | written to another region in the same cache-line. This can | |
2932 | happen for example in network drivers where descriptors for | |
2933 | buffers are typically smaller than the CPU cache-line (e.g. | |
2934 | 16 bytes vs. 32 or 64 bytes). | |
2935 | ||
2936 | Non-cached memory is only supported on 32-bit ARM at present. | |
2937 | ||
6d0f6bcf | 2938 | - CONFIG_SYS_BOOTM_LEN: |
15940c9a SR |
2939 | Normally compressed uImages are limited to an |
2940 | uncompressed size of 8 MBytes. If this is not enough, | |
6d0f6bcf | 2941 | you can define CONFIG_SYS_BOOTM_LEN in your board config file |
15940c9a SR |
2942 | to adjust this setting to your needs. |
2943 | ||
6d0f6bcf | 2944 | - CONFIG_SYS_BOOTMAPSZ: |
c609719b WD |
2945 | Maximum size of memory mapped by the startup code of |
2946 | the Linux kernel; all data that must be processed by | |
7d721e34 BS |
2947 | the Linux kernel (bd_info, boot arguments, FDT blob if |
2948 | used) must be put below this limit, unless "bootm_low" | |
1bce2aeb | 2949 | environment variable is defined and non-zero. In such case |
7d721e34 | 2950 | all data for the Linux kernel must be between "bootm_low" |
c0f40859 | 2951 | and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment |
c3624e6e GL |
2952 | variable "bootm_mapsize" will override the value of |
2953 | CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, | |
2954 | then the value in "bootm_size" will be used instead. | |
c609719b | 2955 | |
fca43cc8 JR |
2956 | - CONFIG_SYS_BOOT_RAMDISK_HIGH: |
2957 | Enable initrd_high functionality. If defined then the | |
2958 | initrd_high feature is enabled and the bootm ramdisk subcommand | |
2959 | is enabled. | |
2960 | ||
2961 | - CONFIG_SYS_BOOT_GET_CMDLINE: | |
2962 | Enables allocating and saving kernel cmdline in space between | |
2963 | "bootm_low" and "bootm_low" + BOOTMAPSZ. | |
2964 | ||
2965 | - CONFIG_SYS_BOOT_GET_KBD: | |
2966 | Enables allocating and saving a kernel copy of the bd_info in | |
2967 | space between "bootm_low" and "bootm_low" + BOOTMAPSZ. | |
2968 | ||
6d0f6bcf | 2969 | - CONFIG_SYS_MAX_FLASH_BANKS: |
c609719b WD |
2970 | Max number of Flash memory banks |
2971 | ||
6d0f6bcf | 2972 | - CONFIG_SYS_MAX_FLASH_SECT: |
c609719b WD |
2973 | Max number of sectors on a Flash chip |
2974 | ||
6d0f6bcf | 2975 | - CONFIG_SYS_FLASH_ERASE_TOUT: |
c609719b WD |
2976 | Timeout for Flash erase operations (in ms) |
2977 | ||
6d0f6bcf | 2978 | - CONFIG_SYS_FLASH_WRITE_TOUT: |
c609719b WD |
2979 | Timeout for Flash write operations (in ms) |
2980 | ||
6d0f6bcf | 2981 | - CONFIG_SYS_FLASH_LOCK_TOUT |
8564acf9 WD |
2982 | Timeout for Flash set sector lock bit operation (in ms) |
2983 | ||
6d0f6bcf | 2984 | - CONFIG_SYS_FLASH_UNLOCK_TOUT |
8564acf9 WD |
2985 | Timeout for Flash clear lock bits operation (in ms) |
2986 | ||
6d0f6bcf | 2987 | - CONFIG_SYS_FLASH_PROTECTION |
8564acf9 WD |
2988 | If defined, hardware flash sectors protection is used |
2989 | instead of U-Boot software protection. | |
2990 | ||
6d0f6bcf | 2991 | - CONFIG_SYS_DIRECT_FLASH_TFTP: |
c609719b WD |
2992 | |
2993 | Enable TFTP transfers directly to flash memory; | |
2994 | without this option such a download has to be | |
2995 | performed in two steps: (1) download to RAM, and (2) | |
2996 | copy from RAM to flash. | |
2997 | ||
2998 | The two-step approach is usually more reliable, since | |
2999 | you can check if the download worked before you erase | |
11ccc33f MZ |
3000 | the flash, but in some situations (when system RAM is |
3001 | too limited to allow for a temporary copy of the | |
c609719b WD |
3002 | downloaded image) this option may be very useful. |
3003 | ||
6d0f6bcf | 3004 | - CONFIG_SYS_FLASH_CFI: |
43d9616c | 3005 | Define if the flash driver uses extra elements in the |
5653fc33 WD |
3006 | common flash structure for storing flash geometry. |
3007 | ||
00b1883a | 3008 | - CONFIG_FLASH_CFI_DRIVER |
5653fc33 WD |
3009 | This option also enables the building of the cfi_flash driver |
3010 | in the drivers directory | |
c609719b | 3011 | |
91809ed5 PZ |
3012 | - CONFIG_FLASH_CFI_MTD |
3013 | This option enables the building of the cfi_mtd driver | |
3014 | in the drivers directory. The driver exports CFI flash | |
3015 | to the MTD layer. | |
3016 | ||
6d0f6bcf | 3017 | - CONFIG_SYS_FLASH_USE_BUFFER_WRITE |
96ef831f GL |
3018 | Use buffered writes to flash. |
3019 | ||
3020 | - CONFIG_FLASH_SPANSION_S29WS_N | |
3021 | s29ws-n MirrorBit flash has non-standard addresses for buffered | |
3022 | write commands. | |
3023 | ||
6d0f6bcf | 3024 | - CONFIG_SYS_FLASH_QUIET_TEST |
5568e613 SR |
3025 | If this option is defined, the common CFI flash doesn't |
3026 | print it's warning upon not recognized FLASH banks. This | |
3027 | is useful, if some of the configured banks are only | |
3028 | optionally available. | |
3029 | ||
9a042e9c JVB |
3030 | - CONFIG_FLASH_SHOW_PROGRESS |
3031 | If defined (must be an integer), print out countdown | |
3032 | digits and dots. Recommended value: 45 (9..1) for 80 | |
3033 | column displays, 15 (3..1) for 40 column displays. | |
3034 | ||
352ef3f1 SR |
3035 | - CONFIG_FLASH_VERIFY |
3036 | If defined, the content of the flash (destination) is compared | |
3037 | against the source after the write operation. An error message | |
3038 | will be printed when the contents are not identical. | |
3039 | Please note that this option is useless in nearly all cases, | |
3040 | since such flash programming errors usually are detected earlier | |
3041 | while unprotecting/erasing/programming. Please only enable | |
3042 | this option if you really know what you are doing. | |
3043 | ||
6d0f6bcf | 3044 | - CONFIG_SYS_RX_ETH_BUFFER: |
11ccc33f MZ |
3045 | Defines the number of Ethernet receive buffers. On some |
3046 | Ethernet controllers it is recommended to set this value | |
53cf9435 SR |
3047 | to 8 or even higher (EEPRO100 or 405 EMAC), since all |
3048 | buffers can be full shortly after enabling the interface | |
11ccc33f | 3049 | on high Ethernet traffic. |
53cf9435 SR |
3050 | Defaults to 4 if not defined. |
3051 | ||
ea882baf WD |
3052 | - CONFIG_ENV_MAX_ENTRIES |
3053 | ||
071bc923 WD |
3054 | Maximum number of entries in the hash table that is used |
3055 | internally to store the environment settings. The default | |
3056 | setting is supposed to be generous and should work in most | |
3057 | cases. This setting can be used to tune behaviour; see | |
3058 | lib/hashtable.c for details. | |
ea882baf | 3059 | |
2598090b JH |
3060 | - CONFIG_ENV_FLAGS_LIST_DEFAULT |
3061 | - CONFIG_ENV_FLAGS_LIST_STATIC | |
1bce2aeb | 3062 | Enable validation of the values given to environment variables when |
2598090b JH |
3063 | calling env set. Variables can be restricted to only decimal, |
3064 | hexadecimal, or boolean. If CONFIG_CMD_NET is also defined, | |
3065 | the variables can also be restricted to IP address or MAC address. | |
3066 | ||
3067 | The format of the list is: | |
3068 | type_attribute = [s|d|x|b|i|m] | |
b445bbb4 JM |
3069 | access_attribute = [a|r|o|c] |
3070 | attributes = type_attribute[access_attribute] | |
2598090b JH |
3071 | entry = variable_name[:attributes] |
3072 | list = entry[,list] | |
3073 | ||
3074 | The type attributes are: | |
3075 | s - String (default) | |
3076 | d - Decimal | |
3077 | x - Hexadecimal | |
3078 | b - Boolean ([1yYtT|0nNfF]) | |
3079 | i - IP address | |
3080 | m - MAC address | |
3081 | ||
267541f7 JH |
3082 | The access attributes are: |
3083 | a - Any (default) | |
3084 | r - Read-only | |
3085 | o - Write-once | |
3086 | c - Change-default | |
3087 | ||
2598090b JH |
3088 | - CONFIG_ENV_FLAGS_LIST_DEFAULT |
3089 | Define this to a list (string) to define the ".flags" | |
b445bbb4 | 3090 | environment variable in the default or embedded environment. |
2598090b JH |
3091 | |
3092 | - CONFIG_ENV_FLAGS_LIST_STATIC | |
3093 | Define this to a list (string) to define validation that | |
3094 | should be done if an entry is not found in the ".flags" | |
3095 | environment variable. To override a setting in the static | |
3096 | list, simply add an entry for the same variable name to the | |
3097 | ".flags" variable. | |
3098 | ||
bdf1fe4e JH |
3099 | If CONFIG_REGEX is defined, the variable_name above is evaluated as a |
3100 | regular expression. This allows multiple variables to define the same | |
3101 | flags without explicitly listing them for each variable. | |
3102 | ||
267541f7 JH |
3103 | - CONFIG_ENV_ACCESS_IGNORE_FORCE |
3104 | If defined, don't allow the -f switch to env set override variable | |
3105 | access flags. | |
3106 | ||
0d296cc2 GB |
3107 | - CONFIG_USE_STDINT |
3108 | If stdint.h is available with your toolchain you can define this | |
3109 | option to enable it. You can provide option 'USE_STDINT=1' when | |
3110 | building U-Boot to enable this. | |
3111 | ||
c609719b WD |
3112 | The following definitions that deal with the placement and management |
3113 | of environment data (variable area); in general, we support the | |
3114 | following configurations: | |
3115 | ||
c3eb3fe4 MF |
3116 | - CONFIG_BUILD_ENVCRC: |
3117 | ||
3118 | Builds up envcrc with the target environment so that external utils | |
3119 | may easily extract it and embed it in final U-Boot images. | |
3120 | ||
c609719b | 3121 | BE CAREFUL! The first access to the environment happens quite early |
b445bbb4 | 3122 | in U-Boot initialization (when we try to get the setting of for the |
11ccc33f | 3123 | console baudrate). You *MUST* have mapped your NVRAM area then, or |
c609719b WD |
3124 | U-Boot will hang. |
3125 | ||
3126 | Please note that even with NVRAM we still use a copy of the | |
3127 | environment in RAM: we could work on NVRAM directly, but we want to | |
3128 | keep settings there always unmodified except somebody uses "saveenv" | |
3129 | to save the current settings. | |
3130 | ||
0a85a9e7 LG |
3131 | BE CAREFUL! For some special cases, the local device can not use |
3132 | "saveenv" command. For example, the local device will get the | |
fc54c7fa LG |
3133 | environment stored in a remote NOR flash by SRIO or PCIE link, |
3134 | but it can not erase, write this NOR flash by SRIO or PCIE interface. | |
0a85a9e7 | 3135 | |
b74ab737 GL |
3136 | - CONFIG_NAND_ENV_DST |
3137 | ||
3138 | Defines address in RAM to which the nand_spl code should copy the | |
3139 | environment. If redundant environment is used, it will be copied to | |
3140 | CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. | |
3141 | ||
e881cb56 | 3142 | Please note that the environment is read-only until the monitor |
c609719b | 3143 | has been relocated to RAM and a RAM copy of the environment has been |
00caae6d | 3144 | created; also, when using EEPROM you will have to use env_get_f() |
c609719b WD |
3145 | until then to read environment variables. |
3146 | ||
85ec0bcc WD |
3147 | The environment is protected by a CRC32 checksum. Before the monitor |
3148 | is relocated into RAM, as a result of a bad CRC you will be working | |
3149 | with the compiled-in default environment - *silently*!!! [This is | |
3150 | necessary, because the first environment variable we need is the | |
3151 | "baudrate" setting for the console - if we have a bad CRC, we don't | |
3152 | have any device yet where we could complain.] | |
c609719b WD |
3153 | |
3154 | Note: once the monitor has been relocated, then it will complain if | |
3155 | the default environment is used; a new CRC is computed as soon as you | |
85ec0bcc | 3156 | use the "saveenv" command to store a valid environment. |
c609719b | 3157 | |
6d0f6bcf | 3158 | - CONFIG_SYS_FAULT_ECHO_LINK_DOWN: |
42d1f039 | 3159 | Echo the inverted Ethernet link state to the fault LED. |
fc3e2165 | 3160 | |
6d0f6bcf | 3161 | Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR |
fc3e2165 WD |
3162 | also needs to be defined. |
3163 | ||
6d0f6bcf | 3164 | - CONFIG_SYS_FAULT_MII_ADDR: |
42d1f039 | 3165 | MII address of the PHY to check for the Ethernet link state. |
c609719b | 3166 | |
f5675aa5 RM |
3167 | - CONFIG_NS16550_MIN_FUNCTIONS: |
3168 | Define this if you desire to only have use of the NS16550_init | |
3169 | and NS16550_putc functions for the serial driver located at | |
3170 | drivers/serial/ns16550.c. This option is useful for saving | |
3171 | space for already greatly restricted images, including but not | |
3172 | limited to NAND_SPL configurations. | |
3173 | ||
b2b92f53 SG |
3174 | - CONFIG_DISPLAY_BOARDINFO |
3175 | Display information about the board that U-Boot is running on | |
3176 | when U-Boot starts up. The board function checkboard() is called | |
3177 | to do this. | |
3178 | ||
e2e3e2b1 SG |
3179 | - CONFIG_DISPLAY_BOARDINFO_LATE |
3180 | Similar to the previous option, but display this information | |
3181 | later, once stdio is running and output goes to the LCD, if | |
3182 | present. | |
3183 | ||
feb85801 SS |
3184 | - CONFIG_BOARD_SIZE_LIMIT: |
3185 | Maximum size of the U-Boot image. When defined, the | |
3186 | build system checks that the actual size does not | |
3187 | exceed it. | |
3188 | ||
c609719b | 3189 | Low Level (hardware related) configuration options: |
dc7c9a1a | 3190 | --------------------------------------------------- |
c609719b | 3191 | |
6d0f6bcf | 3192 | - CONFIG_SYS_CACHELINE_SIZE: |
c609719b WD |
3193 | Cache Line Size of the CPU. |
3194 | ||
e46fedfe TT |
3195 | - CONFIG_SYS_CCSRBAR_DEFAULT: |
3196 | Default (power-on reset) physical address of CCSR on Freescale | |
3197 | PowerPC SOCs. | |
3198 | ||
3199 | - CONFIG_SYS_CCSRBAR: | |
3200 | Virtual address of CCSR. On a 32-bit build, this is typically | |
3201 | the same value as CONFIG_SYS_CCSRBAR_DEFAULT. | |
3202 | ||
e46fedfe TT |
3203 | - CONFIG_SYS_CCSRBAR_PHYS: |
3204 | Physical address of CCSR. CCSR can be relocated to a new | |
3205 | physical address, if desired. In this case, this macro should | |
c0f40859 | 3206 | be set to that address. Otherwise, it should be set to the |
e46fedfe TT |
3207 | same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR |
3208 | is typically relocated on 36-bit builds. It is recommended | |
3209 | that this macro be defined via the _HIGH and _LOW macros: | |
3210 | ||
3211 | #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH | |
3212 | * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) | |
3213 | ||
3214 | - CONFIG_SYS_CCSRBAR_PHYS_HIGH: | |
4cf2609b WD |
3215 | Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically |
3216 | either 0 (32-bit build) or 0xF (36-bit build). This macro is | |
e46fedfe TT |
3217 | used in assembly code, so it must not contain typecasts or |
3218 | integer size suffixes (e.g. "ULL"). | |
3219 | ||
3220 | - CONFIG_SYS_CCSRBAR_PHYS_LOW: | |
3221 | Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is | |
3222 | used in assembly code, so it must not contain typecasts or | |
3223 | integer size suffixes (e.g. "ULL"). | |
3224 | ||
3225 | - CONFIG_SYS_CCSR_DO_NOT_RELOCATE: | |
3226 | If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be | |
3227 | forced to a value that ensures that CCSR is not relocated. | |
3228 | ||
7f6c2cbc | 3229 | - Floppy Disk Support: |
6d0f6bcf | 3230 | CONFIG_SYS_FDC_DRIVE_NUMBER |
7f6c2cbc WD |
3231 | |
3232 | the default drive number (default value 0) | |
3233 | ||
6d0f6bcf | 3234 | CONFIG_SYS_ISA_IO_STRIDE |
7f6c2cbc | 3235 | |
11ccc33f | 3236 | defines the spacing between FDC chipset registers |
7f6c2cbc WD |
3237 | (default value 1) |
3238 | ||
6d0f6bcf | 3239 | CONFIG_SYS_ISA_IO_OFFSET |
7f6c2cbc | 3240 | |
43d9616c WD |
3241 | defines the offset of register from address. It |
3242 | depends on which part of the data bus is connected to | |
11ccc33f | 3243 | the FDC chipset. (default value 0) |
7f6c2cbc | 3244 | |
6d0f6bcf JCPV |
3245 | If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and |
3246 | CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their | |
43d9616c | 3247 | default value. |
7f6c2cbc | 3248 | |
6d0f6bcf | 3249 | if CONFIG_SYS_FDC_HW_INIT is defined, then the function |
43d9616c WD |
3250 | fdc_hw_init() is called at the beginning of the FDC |
3251 | setup. fdc_hw_init() must be provided by the board | |
b445bbb4 | 3252 | source code. It is used to make hardware-dependent |
43d9616c | 3253 | initializations. |
7f6c2cbc | 3254 | |
0abddf82 ML |
3255 | - CONFIG_IDE_AHB: |
3256 | Most IDE controllers were designed to be connected with PCI | |
3257 | interface. Only few of them were designed for AHB interface. | |
3258 | When software is doing ATA command and data transfer to | |
3259 | IDE devices through IDE-AHB controller, some additional | |
3260 | registers accessing to these kind of IDE-AHB controller | |
b445bbb4 | 3261 | is required. |
0abddf82 | 3262 | |
6d0f6bcf | 3263 | - CONFIG_SYS_IMMR: Physical address of the Internal Memory. |
efe2a4d5 | 3264 | DO NOT CHANGE unless you know exactly what you're |
907208c4 | 3265 | doing! (11-4) [MPC8xx systems only] |
c609719b | 3266 | |
6d0f6bcf | 3267 | - CONFIG_SYS_INIT_RAM_ADDR: |
c609719b | 3268 | |
7152b1d0 | 3269 | Start address of memory area that can be used for |
c609719b WD |
3270 | initial data and stack; please note that this must be |
3271 | writable memory that is working WITHOUT special | |
3272 | initialization, i. e. you CANNOT use normal RAM which | |
3273 | will become available only after programming the | |
3274 | memory controller and running certain initialization | |
3275 | sequences. | |
3276 | ||
3277 | U-Boot uses the following memory types: | |
907208c4 | 3278 | - MPC8xx: IMMR (internal memory of the CPU) |
c609719b | 3279 | |
6d0f6bcf | 3280 | - CONFIG_SYS_GBL_DATA_OFFSET: |
c609719b WD |
3281 | |
3282 | Offset of the initial data structure in the memory | |
6d0f6bcf JCPV |
3283 | area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually |
3284 | CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial | |
c609719b | 3285 | data is located at the end of the available space |
553f0982 | 3286 | (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE - |
acd51f9d | 3287 | GENERATED_GBL_DATA_SIZE), and the initial stack is just |
6d0f6bcf JCPV |
3288 | below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + |
3289 | CONFIG_SYS_GBL_DATA_OFFSET) downward. | |
c609719b WD |
3290 | |
3291 | Note: | |
3292 | On the MPC824X (or other systems that use the data | |
3293 | cache for initial memory) the address chosen for | |
6d0f6bcf | 3294 | CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must |
c609719b WD |
3295 | point to an otherwise UNUSED address space between |
3296 | the top of RAM and the start of the PCI space. | |
3297 | ||
6d0f6bcf | 3298 | - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) |
c609719b | 3299 | |
6d0f6bcf | 3300 | - CONFIG_SYS_OR_TIMING_SDRAM: |
c609719b WD |
3301 | SDRAM timing |
3302 | ||
6d0f6bcf | 3303 | - CONFIG_SYS_MAMR_PTA: |
c609719b WD |
3304 | periodic timer for refresh |
3305 | ||
6d0f6bcf JCPV |
3306 | - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, |
3307 | CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, | |
3308 | CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, | |
3309 | CONFIG_SYS_BR1_PRELIM: | |
c609719b WD |
3310 | Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) |
3311 | ||
3312 | - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, | |
6d0f6bcf JCPV |
3313 | CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, |
3314 | CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: | |
c609719b WD |
3315 | Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) |
3316 | ||
69fd2d3b | 3317 | - CONFIG_PCI_ENUM_ONLY |
b445bbb4 | 3318 | Only scan through and get the devices on the buses. |
69fd2d3b AS |
3319 | Don't do any setup work, presumably because someone or |
3320 | something has already done it, and we don't need to do it | |
3321 | a second time. Useful for platforms that are pre-booted | |
3322 | by coreboot or similar. | |
3323 | ||
842033e6 GJ |
3324 | - CONFIG_PCI_INDIRECT_BRIDGE: |
3325 | Enable support for indirect PCI bridges. | |
3326 | ||
a09b9b68 KG |
3327 | - CONFIG_SYS_SRIO: |
3328 | Chip has SRIO or not | |
3329 | ||
3330 | - CONFIG_SRIO1: | |
3331 | Board has SRIO 1 port available | |
3332 | ||
3333 | - CONFIG_SRIO2: | |
3334 | Board has SRIO 2 port available | |
3335 | ||
c8b28152 LG |
3336 | - CONFIG_SRIO_PCIE_BOOT_MASTER |
3337 | Board can support master function for Boot from SRIO and PCIE | |
3338 | ||
a09b9b68 KG |
3339 | - CONFIG_SYS_SRIOn_MEM_VIRT: |
3340 | Virtual Address of SRIO port 'n' memory region | |
3341 | ||
3342 | - CONFIG_SYS_SRIOn_MEM_PHYS: | |
3343 | Physical Address of SRIO port 'n' memory region | |
3344 | ||
3345 | - CONFIG_SYS_SRIOn_MEM_SIZE: | |
3346 | Size of SRIO port 'n' memory region | |
3347 | ||
66bd1846 FE |
3348 | - CONFIG_SYS_NAND_BUSWIDTH_16BIT |
3349 | Defined to tell the NAND controller that the NAND chip is using | |
3350 | a 16 bit bus. | |
3351 | Not all NAND drivers use this symbol. | |
a430e916 | 3352 | Example of drivers that use it: |
66bd1846 | 3353 | - drivers/mtd/nand/ndfc.c |
a430e916 | 3354 | - drivers/mtd/nand/mxc_nand.c |
eced4626 AW |
3355 | |
3356 | - CONFIG_SYS_NDFC_EBC0_CFG | |
3357 | Sets the EBC0_CFG register for the NDFC. If not defined | |
3358 | a default value will be used. | |
3359 | ||
bb99ad6d | 3360 | - CONFIG_SPD_EEPROM |
218ca724 WD |
3361 | Get DDR timing information from an I2C EEPROM. Common |
3362 | with pluggable memory modules such as SODIMMs | |
3363 | ||
bb99ad6d BW |
3364 | SPD_EEPROM_ADDRESS |
3365 | I2C address of the SPD EEPROM | |
3366 | ||
6d0f6bcf | 3367 | - CONFIG_SYS_SPD_BUS_NUM |
218ca724 WD |
3368 | If SPD EEPROM is on an I2C bus other than the first |
3369 | one, specify here. Note that the value must resolve | |
3370 | to something your driver can deal with. | |
bb99ad6d | 3371 | |
1b3e3c4f YS |
3372 | - CONFIG_SYS_DDR_RAW_TIMING |
3373 | Get DDR timing information from other than SPD. Common with | |
3374 | soldered DDR chips onboard without SPD. DDR raw timing | |
3375 | parameters are extracted from datasheet and hard-coded into | |
3376 | header files or board specific files. | |
3377 | ||
6f5e1dc5 YS |
3378 | - CONFIG_FSL_DDR_INTERACTIVE |
3379 | Enable interactive DDR debugging. See doc/README.fsl-ddr. | |
3380 | ||
e32d59a2 YS |
3381 | - CONFIG_FSL_DDR_SYNC_REFRESH |
3382 | Enable sync of refresh for multiple controllers. | |
3383 | ||
4516ff81 YS |
3384 | - CONFIG_FSL_DDR_BIST |
3385 | Enable built-in memory test for Freescale DDR controllers. | |
3386 | ||
6d0f6bcf | 3387 | - CONFIG_SYS_83XX_DDR_USES_CS0 |
218ca724 WD |
3388 | Only for 83xx systems. If specified, then DDR should |
3389 | be configured using CS0 and CS1 instead of CS2 and CS3. | |
2ad6b513 | 3390 | |
c26e454d WD |
3391 | - CONFIG_RMII |
3392 | Enable RMII mode for all FECs. | |
3393 | Note that this is a global option, we can't | |
3394 | have one FEC in standard MII mode and another in RMII mode. | |
3395 | ||
5cf91d6b WD |
3396 | - CONFIG_CRC32_VERIFY |
3397 | Add a verify option to the crc32 command. | |
3398 | The syntax is: | |
3399 | ||
3400 | => crc32 -v <address> <count> <crc32> | |
3401 | ||
3402 | Where address/count indicate a memory area | |
3403 | and crc32 is the correct crc32 which the | |
3404 | area should have. | |
3405 | ||
56523f12 WD |
3406 | - CONFIG_LOOPW |
3407 | Add the "loopw" memory command. This only takes effect if | |
493f420e | 3408 | the memory commands are activated globally (CONFIG_CMD_MEMORY). |
56523f12 | 3409 | |
7b466641 SR |
3410 | - CONFIG_MX_CYCLIC |
3411 | Add the "mdc" and "mwc" memory commands. These are cyclic | |
3412 | "md/mw" commands. | |
3413 | Examples: | |
3414 | ||
efe2a4d5 | 3415 | => mdc.b 10 4 500 |
7b466641 SR |
3416 | This command will print 4 bytes (10,11,12,13) each 500 ms. |
3417 | ||
efe2a4d5 | 3418 | => mwc.l 100 12345678 10 |
7b466641 SR |
3419 | This command will write 12345678 to address 100 all 10 ms. |
3420 | ||
efe2a4d5 | 3421 | This only takes effect if the memory commands are activated |
493f420e | 3422 | globally (CONFIG_CMD_MEMORY). |
7b466641 | 3423 | |
8aa1a2d1 | 3424 | - CONFIG_SKIP_LOWLEVEL_INIT |
3fafced7 | 3425 | [ARM, NDS32, MIPS, RISC-V only] If this variable is defined, then certain |
844f07d8 WD |
3426 | low level initializations (like setting up the memory |
3427 | controller) are omitted and/or U-Boot does not | |
3428 | relocate itself into RAM. | |
3429 | ||
3430 | Normally this variable MUST NOT be defined. The only | |
3431 | exception is when U-Boot is loaded (to RAM) by some | |
3432 | other boot loader or by a debugger which performs | |
3433 | these initializations itself. | |
8aa1a2d1 | 3434 | |
b5bd0982 SG |
3435 | - CONFIG_SKIP_LOWLEVEL_INIT_ONLY |
3436 | [ARM926EJ-S only] This allows just the call to lowlevel_init() | |
90211f77 | 3437 | to be skipped. The normal CP15 init (such as enabling the |
b5bd0982 SG |
3438 | instruction cache) is still performed. |
3439 | ||
401bb30b | 3440 | - CONFIG_SPL_BUILD |
df81238b ML |
3441 | Modifies the behaviour of start.S when compiling a loader |
3442 | that is executed before the actual U-Boot. E.g. when | |
3443 | compiling a NAND SPL. | |
400558b5 | 3444 | |
3aa29de0 YZ |
3445 | - CONFIG_TPL_BUILD |
3446 | Modifies the behaviour of start.S when compiling a loader | |
3447 | that is executed after the SPL and before the actual U-Boot. | |
3448 | It is loaded by the SPL. | |
3449 | ||
5df572f0 YZ |
3450 | - CONFIG_SYS_MPC85XX_NO_RESETVEC |
3451 | Only for 85xx systems. If this variable is specified, the section | |
3452 | .resetvec is not kept and the section .bootpg is placed in the | |
3453 | previous 4k of the .text section. | |
3454 | ||
4213fc29 SG |
3455 | - CONFIG_ARCH_MAP_SYSMEM |
3456 | Generally U-Boot (and in particular the md command) uses | |
3457 | effective address. It is therefore not necessary to regard | |
3458 | U-Boot address as virtual addresses that need to be translated | |
3459 | to physical addresses. However, sandbox requires this, since | |
3460 | it maintains its own little RAM buffer which contains all | |
3461 | addressable memory. This option causes some memory accesses | |
3462 | to be mapped through map_sysmem() / unmap_sysmem(). | |
3463 | ||
588a13f7 SG |
3464 | - CONFIG_X86_RESET_VECTOR |
3465 | If defined, the x86 reset vector code is included. This is not | |
3466 | needed when U-Boot is running from Coreboot. | |
b16f521a | 3467 | |
16678eb4 HS |
3468 | - CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC: |
3469 | Enables the RTC32K OSC on AM33xx based plattforms | |
3470 | ||
999d7d32 KM |
3471 | - CONFIG_SYS_NAND_NO_SUBPAGE_WRITE |
3472 | Option to disable subpage write in NAND driver | |
3473 | driver that uses this: | |
3474 | drivers/mtd/nand/davinci_nand.c | |
3475 | ||
f2717b47 TT |
3476 | Freescale QE/FMAN Firmware Support: |
3477 | ----------------------------------- | |
3478 | ||
3479 | The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the | |
3480 | loading of "firmware", which is encoded in the QE firmware binary format. | |
3481 | This firmware often needs to be loaded during U-Boot booting, so macros | |
3482 | are used to identify the storage device (NOR flash, SPI, etc) and the address | |
3483 | within that device. | |
3484 | ||
dcf1d774 ZQ |
3485 | - CONFIG_SYS_FMAN_FW_ADDR |
3486 | The address in the storage device where the FMAN microcode is located. The | |
3487 | meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro | |
3488 | is also specified. | |
3489 | ||
3490 | - CONFIG_SYS_QE_FW_ADDR | |
3491 | The address in the storage device where the QE microcode is located. The | |
f2717b47 TT |
3492 | meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro |
3493 | is also specified. | |
3494 | ||
3495 | - CONFIG_SYS_QE_FMAN_FW_LENGTH | |
3496 | The maximum possible size of the firmware. The firmware binary format | |
3497 | has a field that specifies the actual size of the firmware, but it | |
3498 | might not be possible to read any part of the firmware unless some | |
3499 | local storage is allocated to hold the entire firmware first. | |
3500 | ||
3501 | - CONFIG_SYS_QE_FMAN_FW_IN_NOR | |
3502 | Specifies that QE/FMAN firmware is located in NOR flash, mapped as | |
3503 | normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the | |
3504 | virtual address in NOR flash. | |
3505 | ||
3506 | - CONFIG_SYS_QE_FMAN_FW_IN_NAND | |
3507 | Specifies that QE/FMAN firmware is located in NAND flash. | |
3508 | CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash. | |
3509 | ||
3510 | - CONFIG_SYS_QE_FMAN_FW_IN_MMC | |
3511 | Specifies that QE/FMAN firmware is located on the primary SD/MMC | |
3512 | device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. | |
3513 | ||
292dc6c5 LG |
3514 | - CONFIG_SYS_QE_FMAN_FW_IN_REMOTE |
3515 | Specifies that QE/FMAN firmware is located in the remote (master) | |
3516 | memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which | |
fc54c7fa LG |
3517 | can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound |
3518 | window->master inbound window->master LAW->the ucode address in | |
3519 | master's memory space. | |
f2717b47 | 3520 | |
b940ca64 GR |
3521 | Freescale Layerscape Management Complex Firmware Support: |
3522 | --------------------------------------------------------- | |
3523 | The Freescale Layerscape Management Complex (MC) supports the loading of | |
3524 | "firmware". | |
3525 | This firmware often needs to be loaded during U-Boot booting, so macros | |
3526 | are used to identify the storage device (NOR flash, SPI, etc) and the address | |
3527 | within that device. | |
3528 | ||
3529 | - CONFIG_FSL_MC_ENET | |
3530 | Enable the MC driver for Layerscape SoCs. | |
3531 | ||
5c055089 PK |
3532 | Freescale Layerscape Debug Server Support: |
3533 | ------------------------------------------- | |
3534 | The Freescale Layerscape Debug Server Support supports the loading of | |
3535 | "Debug Server firmware" and triggering SP boot-rom. | |
3536 | This firmware often needs to be loaded during U-Boot booting. | |
3537 | ||
c0492141 YS |
3538 | - CONFIG_SYS_MC_RSV_MEM_ALIGN |
3539 | Define alignment of reserved memory MC requires | |
5c055089 | 3540 | |
f3f431a7 PK |
3541 | Reproducible builds |
3542 | ------------------- | |
3543 | ||
3544 | In order to achieve reproducible builds, timestamps used in the U-Boot build | |
3545 | process have to be set to a fixed value. | |
3546 | ||
3547 | This is done using the SOURCE_DATE_EPOCH environment variable. | |
3548 | SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration | |
3549 | option for U-Boot or an environment variable in U-Boot. | |
3550 | ||
3551 | SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC. | |
3552 | ||
c609719b WD |
3553 | Building the Software: |
3554 | ====================== | |
3555 | ||
218ca724 WD |
3556 | Building U-Boot has been tested in several native build environments |
3557 | and in many different cross environments. Of course we cannot support | |
3558 | all possibly existing versions of cross development tools in all | |
3559 | (potentially obsolete) versions. In case of tool chain problems we | |
3560 | recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) | |
3561 | which is extensively used to build and test U-Boot. | |
c609719b | 3562 | |
218ca724 WD |
3563 | If you are not using a native environment, it is assumed that you |
3564 | have GNU cross compiling tools available in your path. In this case, | |
3565 | you must set the environment variable CROSS_COMPILE in your shell. | |
3566 | Note that no changes to the Makefile or any other source files are | |
3567 | necessary. For example using the ELDK on a 4xx CPU, please enter: | |
c609719b | 3568 | |
218ca724 WD |
3569 | $ CROSS_COMPILE=ppc_4xx- |
3570 | $ export CROSS_COMPILE | |
c609719b | 3571 | |
2f8d396b PT |
3572 | Note: If you wish to generate Windows versions of the utilities in |
3573 | the tools directory you can use the MinGW toolchain | |
3574 | (http://www.mingw.org). Set your HOST tools to the MinGW | |
3575 | toolchain and execute 'make tools'. For example: | |
3576 | ||
3577 | $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools | |
3578 | ||
3579 | Binaries such as tools/mkimage.exe will be created which can | |
3580 | be executed on computers running Windows. | |
3581 | ||
218ca724 WD |
3582 | U-Boot is intended to be simple to build. After installing the |
3583 | sources you must configure U-Boot for one specific board type. This | |
c609719b WD |
3584 | is done by typing: |
3585 | ||
ab584d67 | 3586 | make NAME_defconfig |
c609719b | 3587 | |
ab584d67 | 3588 | where "NAME_defconfig" is the name of one of the existing configu- |
4d675ae6 | 3589 | rations; see boards.cfg for supported names. |
db01a2ea | 3590 | |
2729af9d WD |
3591 | Note: for some board special configuration names may exist; check if |
3592 | additional information is available from the board vendor; for | |
3593 | instance, the TQM823L systems are available without (standard) | |
3594 | or with LCD support. You can select such additional "features" | |
11ccc33f | 3595 | when choosing the configuration, i. e. |
2729af9d | 3596 | |
ab584d67 | 3597 | make TQM823L_defconfig |
2729af9d WD |
3598 | - will configure for a plain TQM823L, i. e. no LCD support |
3599 | ||
ab584d67 | 3600 | make TQM823L_LCD_defconfig |
2729af9d WD |
3601 | - will configure for a TQM823L with U-Boot console on LCD |
3602 | ||
3603 | etc. | |
3604 | ||
3605 | ||
3606 | Finally, type "make all", and you should get some working U-Boot | |
3607 | images ready for download to / installation on your system: | |
3608 | ||
3609 | - "u-boot.bin" is a raw binary image | |
3610 | - "u-boot" is an image in ELF binary format | |
3611 | - "u-boot.srec" is in Motorola S-Record format | |
3612 | ||
baf31249 MB |
3613 | By default the build is performed locally and the objects are saved |
3614 | in the source directory. One of the two methods can be used to change | |
3615 | this behavior and build U-Boot to some external directory: | |
3616 | ||
3617 | 1. Add O= to the make command line invocations: | |
3618 | ||
3619 | make O=/tmp/build distclean | |
ab584d67 | 3620 | make O=/tmp/build NAME_defconfig |
baf31249 MB |
3621 | make O=/tmp/build all |
3622 | ||
adbba996 | 3623 | 2. Set environment variable KBUILD_OUTPUT to point to the desired location: |
baf31249 | 3624 | |
adbba996 | 3625 | export KBUILD_OUTPUT=/tmp/build |
baf31249 | 3626 | make distclean |
ab584d67 | 3627 | make NAME_defconfig |
baf31249 MB |
3628 | make all |
3629 | ||
adbba996 | 3630 | Note that the command line "O=" setting overrides the KBUILD_OUTPUT environment |
baf31249 MB |
3631 | variable. |
3632 | ||
215bb1c1 DS |
3633 | User specific CPPFLAGS, AFLAGS and CFLAGS can be passed to the compiler by |
3634 | setting the according environment variables KCPPFLAGS, KAFLAGS and KCFLAGS. | |
3635 | For example to treat all compiler warnings as errors: | |
3636 | ||
3637 | make KCFLAGS=-Werror | |
2729af9d WD |
3638 | |
3639 | Please be aware that the Makefiles assume you are using GNU make, so | |
3640 | for instance on NetBSD you might need to use "gmake" instead of | |
3641 | native "make". | |
3642 | ||
3643 | ||
3644 | If the system board that you have is not listed, then you will need | |
3645 | to port U-Boot to your hardware platform. To do this, follow these | |
3646 | steps: | |
3647 | ||
3c1496cd | 3648 | 1. Create a new directory to hold your board specific code. Add any |
2729af9d | 3649 | files you need. In your board directory, you will need at least |
3c1496cd PS |
3650 | the "Makefile" and a "<board>.c". |
3651 | 2. Create a new configuration file "include/configs/<board>.h" for | |
3652 | your board. | |
2729af9d WD |
3653 | 3. If you're porting U-Boot to a new CPU, then also create a new |
3654 | directory to hold your CPU specific code. Add any files you need. | |
ab584d67 | 3655 | 4. Run "make <board>_defconfig" with your new name. |
2729af9d WD |
3656 | 5. Type "make", and you should get a working "u-boot.srec" file |
3657 | to be installed on your target system. | |
3658 | 6. Debug and solve any problems that might arise. | |
3659 | [Of course, this last step is much harder than it sounds.] | |
3660 | ||
3661 | ||
3662 | Testing of U-Boot Modifications, Ports to New Hardware, etc.: | |
3663 | ============================================================== | |
3664 | ||
218ca724 WD |
3665 | If you have modified U-Boot sources (for instance added a new board |
3666 | or support for new devices, a new CPU, etc.) you are expected to | |
2729af9d WD |
3667 | provide feedback to the other developers. The feedback normally takes |
3668 | the form of a "patch", i. e. a context diff against a certain (latest | |
218ca724 | 3669 | official or latest in the git repository) version of U-Boot sources. |
2729af9d | 3670 | |
218ca724 WD |
3671 | But before you submit such a patch, please verify that your modifi- |
3672 | cation did not break existing code. At least make sure that *ALL* of | |
2729af9d | 3673 | the supported boards compile WITHOUT ANY compiler warnings. To do so, |
6de80f21 SG |
3674 | just run the buildman script (tools/buildman/buildman), which will |
3675 | configure and build U-Boot for ALL supported system. Be warned, this | |
3676 | will take a while. Please see the buildman README, or run 'buildman -H' | |
3677 | for documentation. | |
baf31249 MB |
3678 | |
3679 | ||
2729af9d WD |
3680 | See also "U-Boot Porting Guide" below. |
3681 | ||
3682 | ||
3683 | Monitor Commands - Overview: | |
3684 | ============================ | |
3685 | ||
3686 | go - start application at address 'addr' | |
3687 | run - run commands in an environment variable | |
3688 | bootm - boot application image from memory | |
3689 | bootp - boot image via network using BootP/TFTP protocol | |
44f074c7 | 3690 | bootz - boot zImage from memory |
2729af9d WD |
3691 | tftpboot- boot image via network using TFTP protocol |
3692 | and env variables "ipaddr" and "serverip" | |
3693 | (and eventually "gatewayip") | |
1fb7cd49 | 3694 | tftpput - upload a file via network using TFTP protocol |
2729af9d WD |
3695 | rarpboot- boot image via network using RARP/TFTP protocol |
3696 | diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' | |
3697 | loads - load S-Record file over serial line | |
3698 | loadb - load binary file over serial line (kermit mode) | |
3699 | md - memory display | |
3700 | mm - memory modify (auto-incrementing) | |
3701 | nm - memory modify (constant address) | |
3702 | mw - memory write (fill) | |
3703 | cp - memory copy | |
3704 | cmp - memory compare | |
3705 | crc32 - checksum calculation | |
0f89c54b | 3706 | i2c - I2C sub-system |
2729af9d WD |
3707 | sspi - SPI utility commands |
3708 | base - print or set address offset | |
3709 | printenv- print environment variables | |
3710 | setenv - set environment variables | |
3711 | saveenv - save environment variables to persistent storage | |
3712 | protect - enable or disable FLASH write protection | |
3713 | erase - erase FLASH memory | |
3714 | flinfo - print FLASH memory information | |
10635afa | 3715 | nand - NAND memory operations (see doc/README.nand) |
2729af9d WD |
3716 | bdinfo - print Board Info structure |
3717 | iminfo - print header information for application image | |
3718 | coninfo - print console devices and informations | |
3719 | ide - IDE sub-system | |
3720 | loop - infinite loop on address range | |
56523f12 | 3721 | loopw - infinite write loop on address range |
2729af9d WD |
3722 | mtest - simple RAM test |
3723 | icache - enable or disable instruction cache | |
3724 | dcache - enable or disable data cache | |
3725 | reset - Perform RESET of the CPU | |
3726 | echo - echo args to console | |
3727 | version - print monitor version | |
3728 | help - print online help | |
3729 | ? - alias for 'help' | |
3730 | ||
3731 | ||
3732 | Monitor Commands - Detailed Description: | |
3733 | ======================================== | |
3734 | ||
3735 | TODO. | |
3736 | ||
3737 | For now: just type "help <command>". | |
3738 | ||
3739 | ||
3740 | Environment Variables: | |
3741 | ====================== | |
3742 | ||
3743 | U-Boot supports user configuration using Environment Variables which | |
3744 | can be made persistent by saving to Flash memory. | |
c609719b | 3745 | |
2729af9d WD |
3746 | Environment Variables are set using "setenv", printed using |
3747 | "printenv", and saved to Flash using "saveenv". Using "setenv" | |
3748 | without a value can be used to delete a variable from the | |
3749 | environment. As long as you don't save the environment you are | |
3750 | working with an in-memory copy. In case the Flash area containing the | |
3751 | environment is erased by accident, a default environment is provided. | |
c609719b | 3752 | |
c96f86ee WD |
3753 | Some configuration options can be set using Environment Variables. |
3754 | ||
3755 | List of environment variables (most likely not complete): | |
c609719b | 3756 | |
2729af9d | 3757 | baudrate - see CONFIG_BAUDRATE |
c609719b | 3758 | |
2729af9d | 3759 | bootdelay - see CONFIG_BOOTDELAY |
c609719b | 3760 | |
2729af9d | 3761 | bootcmd - see CONFIG_BOOTCOMMAND |
4a6fd34b | 3762 | |
2729af9d | 3763 | bootargs - Boot arguments when booting an RTOS image |
c609719b | 3764 | |
2729af9d | 3765 | bootfile - Name of the image to load with TFTP |
c609719b | 3766 | |
7d721e34 BS |
3767 | bootm_low - Memory range available for image processing in the bootm |
3768 | command can be restricted. This variable is given as | |
3769 | a hexadecimal number and defines lowest address allowed | |
3770 | for use by the bootm command. See also "bootm_size" | |
3771 | environment variable. Address defined by "bootm_low" is | |
3772 | also the base of the initial memory mapping for the Linux | |
c3624e6e GL |
3773 | kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and |
3774 | bootm_mapsize. | |
3775 | ||
c0f40859 | 3776 | bootm_mapsize - Size of the initial memory mapping for the Linux kernel. |
c3624e6e GL |
3777 | This variable is given as a hexadecimal number and it |
3778 | defines the size of the memory region starting at base | |
3779 | address bootm_low that is accessible by the Linux kernel | |
3780 | during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used | |
3781 | as the default value if it is defined, and bootm_size is | |
3782 | used otherwise. | |
7d721e34 BS |
3783 | |
3784 | bootm_size - Memory range available for image processing in the bootm | |
3785 | command can be restricted. This variable is given as | |
3786 | a hexadecimal number and defines the size of the region | |
3787 | allowed for use by the bootm command. See also "bootm_low" | |
3788 | environment variable. | |
3789 | ||
4bae9090 BS |
3790 | updatefile - Location of the software update file on a TFTP server, used |
3791 | by the automatic software update feature. Please refer to | |
3792 | documentation in doc/README.update for more details. | |
3793 | ||
2729af9d WD |
3794 | autoload - if set to "no" (any string beginning with 'n'), |
3795 | "bootp" will just load perform a lookup of the | |
3796 | configuration from the BOOTP server, but not try to | |
3797 | load any image using TFTP | |
c609719b | 3798 | |
2729af9d WD |
3799 | autostart - if set to "yes", an image loaded using the "bootp", |
3800 | "rarpboot", "tftpboot" or "diskboot" commands will | |
3801 | be automatically started (by internally calling | |
3802 | "bootm") | |
38b99261 | 3803 | |
2729af9d WD |
3804 | If set to "no", a standalone image passed to the |
3805 | "bootm" command will be copied to the load address | |
3806 | (and eventually uncompressed), but NOT be started. | |
3807 | This can be used to load and uncompress arbitrary | |
3808 | data. | |
c609719b | 3809 | |
a28afca5 DL |
3810 | fdt_high - if set this restricts the maximum address that the |
3811 | flattened device tree will be copied into upon boot. | |
fa34f6b2 SG |
3812 | For example, if you have a system with 1 GB memory |
3813 | at physical address 0x10000000, while Linux kernel | |
3814 | only recognizes the first 704 MB as low memory, you | |
3815 | may need to set fdt_high as 0x3C000000 to have the | |
3816 | device tree blob be copied to the maximum address | |
3817 | of the 704 MB low memory, so that Linux kernel can | |
3818 | access it during the boot procedure. | |
3819 | ||
a28afca5 DL |
3820 | If this is set to the special value 0xFFFFFFFF then |
3821 | the fdt will not be copied at all on boot. For this | |
3822 | to work it must reside in writable memory, have | |
3823 | sufficient padding on the end of it for u-boot to | |
3824 | add the information it needs into it, and the memory | |
3825 | must be accessible by the kernel. | |
3826 | ||
eea63e05 SG |
3827 | fdtcontroladdr- if set this is the address of the control flattened |
3828 | device tree used by U-Boot when CONFIG_OF_CONTROL is | |
3829 | defined. | |
3830 | ||
17ea1177 WD |
3831 | i2cfast - (PPC405GP|PPC405EP only) |
3832 | if set to 'y' configures Linux I2C driver for fast | |
3833 | mode (400kHZ). This environment variable is used in | |
3834 | initialization code. So, for changes to be effective | |
3835 | it must be saved and board must be reset. | |
3836 | ||
2729af9d WD |
3837 | initrd_high - restrict positioning of initrd images: |
3838 | If this variable is not set, initrd images will be | |
3839 | copied to the highest possible address in RAM; this | |
3840 | is usually what you want since it allows for | |
3841 | maximum initrd size. If for some reason you want to | |
3842 | make sure that the initrd image is loaded below the | |
6d0f6bcf | 3843 | CONFIG_SYS_BOOTMAPSZ limit, you can set this environment |
2729af9d WD |
3844 | variable to a value of "no" or "off" or "0". |
3845 | Alternatively, you can set it to a maximum upper | |
3846 | address to use (U-Boot will still check that it | |
3847 | does not overwrite the U-Boot stack and data). | |
c609719b | 3848 | |
2729af9d WD |
3849 | For instance, when you have a system with 16 MB |
3850 | RAM, and want to reserve 4 MB from use by Linux, | |
3851 | you can do this by adding "mem=12M" to the value of | |
3852 | the "bootargs" variable. However, now you must make | |
3853 | sure that the initrd image is placed in the first | |
3854 | 12 MB as well - this can be done with | |
c609719b | 3855 | |
2729af9d | 3856 | setenv initrd_high 00c00000 |
c609719b | 3857 | |
2729af9d WD |
3858 | If you set initrd_high to 0xFFFFFFFF, this is an |
3859 | indication to U-Boot that all addresses are legal | |
3860 | for the Linux kernel, including addresses in flash | |
3861 | memory. In this case U-Boot will NOT COPY the | |
3862 | ramdisk at all. This may be useful to reduce the | |
3863 | boot time on your system, but requires that this | |
3864 | feature is supported by your Linux kernel. | |
c609719b | 3865 | |
2729af9d | 3866 | ipaddr - IP address; needed for tftpboot command |
c609719b | 3867 | |
2729af9d WD |
3868 | loadaddr - Default load address for commands like "bootp", |
3869 | "rarpboot", "tftpboot", "loadb" or "diskboot" | |
c609719b | 3870 | |
2729af9d | 3871 | loads_echo - see CONFIG_LOADS_ECHO |
a3d991bd | 3872 | |
2729af9d | 3873 | serverip - TFTP server IP address; needed for tftpboot command |
a3d991bd | 3874 | |
2729af9d | 3875 | bootretry - see CONFIG_BOOT_RETRY_TIME |
a3d991bd | 3876 | |
2729af9d | 3877 | bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR |
a3d991bd | 3878 | |
2729af9d | 3879 | bootstopkey - see CONFIG_AUTOBOOT_STOP_STR |
c609719b | 3880 | |
e2a53458 | 3881 | ethprime - controls which interface is used first. |
c609719b | 3882 | |
e2a53458 MF |
3883 | ethact - controls which interface is currently active. |
3884 | For example you can do the following | |
c609719b | 3885 | |
48690d80 HS |
3886 | => setenv ethact FEC |
3887 | => ping 192.168.0.1 # traffic sent on FEC | |
3888 | => setenv ethact SCC | |
3889 | => ping 10.0.0.1 # traffic sent on SCC | |
c609719b | 3890 | |
e1692577 MF |
3891 | ethrotate - When set to "no" U-Boot does not go through all |
3892 | available network interfaces. | |
3893 | It just stays at the currently selected interface. | |
3894 | ||
c96f86ee | 3895 | netretry - When set to "no" each network operation will |
2729af9d WD |
3896 | either succeed or fail without retrying. |
3897 | When set to "once" the network operation will | |
3898 | fail when all the available network interfaces | |
3899 | are tried once without success. | |
3900 | Useful on scripts which control the retry operation | |
3901 | themselves. | |
c609719b | 3902 | |
b4e2f89d | 3903 | npe_ucode - set load address for the NPE microcode |
a1cf027a | 3904 | |
b445bbb4 | 3905 | silent_linux - If set then Linux will be told to boot silently, by |
8d51aacd SG |
3906 | changing the console to be empty. If "yes" it will be |
3907 | made silent. If "no" it will not be made silent. If | |
3908 | unset, then it will be made silent if the U-Boot console | |
3909 | is silent. | |
3910 | ||
f5fb7346 | 3911 | tftpsrcp - If this is set, the value is used for TFTP's |
ecb0ccd9 WD |
3912 | UDP source port. |
3913 | ||
f5fb7346 | 3914 | tftpdstp - If this is set, the value is used for TFTP's UDP |
28cb9375 WD |
3915 | destination port instead of the Well Know Port 69. |
3916 | ||
c96f86ee WD |
3917 | tftpblocksize - Block size to use for TFTP transfers; if not set, |
3918 | we use the TFTP server's default block size | |
3919 | ||
3920 | tftptimeout - Retransmission timeout for TFTP packets (in milli- | |
3921 | seconds, minimum value is 1000 = 1 second). Defines | |
3922 | when a packet is considered to be lost so it has to | |
3923 | be retransmitted. The default is 5000 = 5 seconds. | |
3924 | Lowering this value may make downloads succeed | |
3925 | faster in networks with high packet loss rates or | |
3926 | with unreliable TFTP servers. | |
3927 | ||
f5fb7346 AA |
3928 | tftptimeoutcountmax - maximum count of TFTP timeouts (no |
3929 | unit, minimum value = 0). Defines how many timeouts | |
3930 | can happen during a single file transfer before that | |
3931 | transfer is aborted. The default is 10, and 0 means | |
3932 | 'no timeouts allowed'. Increasing this value may help | |
3933 | downloads succeed with high packet loss rates, or with | |
3934 | unreliable TFTP servers or client hardware. | |
3935 | ||
c96f86ee | 3936 | vlan - When set to a value < 4095 the traffic over |
11ccc33f | 3937 | Ethernet is encapsulated/received over 802.1q |
2729af9d | 3938 | VLAN tagged frames. |
c609719b | 3939 | |
50768f5b AM |
3940 | bootpretryperiod - Period during which BOOTP/DHCP sends retries. |
3941 | Unsigned value, in milliseconds. If not set, the period will | |
3942 | be either the default (28000), or a value based on | |
3943 | CONFIG_NET_RETRY_COUNT, if defined. This value has | |
3944 | precedence over the valu based on CONFIG_NET_RETRY_COUNT. | |
3945 | ||
dc0b7b0e JH |
3946 | The following image location variables contain the location of images |
3947 | used in booting. The "Image" column gives the role of the image and is | |
3948 | not an environment variable name. The other columns are environment | |
3949 | variable names. "File Name" gives the name of the file on a TFTP | |
3950 | server, "RAM Address" gives the location in RAM the image will be | |
3951 | loaded to, and "Flash Location" gives the image's address in NOR | |
3952 | flash or offset in NAND flash. | |
3953 | ||
3954 | *Note* - these variables don't have to be defined for all boards, some | |
aed9fed9 | 3955 | boards currently use other variables for these purposes, and some |
dc0b7b0e JH |
3956 | boards use these variables for other purposes. |
3957 | ||
c0f40859 WD |
3958 | Image File Name RAM Address Flash Location |
3959 | ----- --------- ----------- -------------- | |
3960 | u-boot u-boot u-boot_addr_r u-boot_addr | |
3961 | Linux kernel bootfile kernel_addr_r kernel_addr | |
3962 | device tree blob fdtfile fdt_addr_r fdt_addr | |
3963 | ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr | |
dc0b7b0e | 3964 | |
2729af9d WD |
3965 | The following environment variables may be used and automatically |
3966 | updated by the network boot commands ("bootp" and "rarpboot"), | |
3967 | depending the information provided by your boot server: | |
c609719b | 3968 | |
2729af9d WD |
3969 | bootfile - see above |
3970 | dnsip - IP address of your Domain Name Server | |
3971 | dnsip2 - IP address of your secondary Domain Name Server | |
3972 | gatewayip - IP address of the Gateway (Router) to use | |
3973 | hostname - Target hostname | |
3974 | ipaddr - see above | |
3975 | netmask - Subnet Mask | |
3976 | rootpath - Pathname of the root filesystem on the NFS server | |
3977 | serverip - see above | |
c1551ea8 | 3978 | |
c1551ea8 | 3979 | |
2729af9d | 3980 | There are two special Environment Variables: |
c1551ea8 | 3981 | |
2729af9d WD |
3982 | serial# - contains hardware identification information such |
3983 | as type string and/or serial number | |
3984 | ethaddr - Ethernet address | |
c609719b | 3985 | |
2729af9d WD |
3986 | These variables can be set only once (usually during manufacturing of |
3987 | the board). U-Boot refuses to delete or overwrite these variables | |
3988 | once they have been set once. | |
c609719b | 3989 | |
f07771cc | 3990 | |
2729af9d | 3991 | Further special Environment Variables: |
f07771cc | 3992 | |
2729af9d WD |
3993 | ver - Contains the U-Boot version string as printed |
3994 | with the "version" command. This variable is | |
3995 | readonly (see CONFIG_VERSION_VARIABLE). | |
f07771cc | 3996 | |
f07771cc | 3997 | |
2729af9d WD |
3998 | Please note that changes to some configuration parameters may take |
3999 | only effect after the next boot (yes, that's just like Windoze :-). | |
f07771cc | 4000 | |
f07771cc | 4001 | |
170ab110 JH |
4002 | Callback functions for environment variables: |
4003 | --------------------------------------------- | |
4004 | ||
4005 | For some environment variables, the behavior of u-boot needs to change | |
b445bbb4 | 4006 | when their values are changed. This functionality allows functions to |
170ab110 JH |
4007 | be associated with arbitrary variables. On creation, overwrite, or |
4008 | deletion, the callback will provide the opportunity for some side | |
4009 | effect to happen or for the change to be rejected. | |
4010 | ||
4011 | The callbacks are named and associated with a function using the | |
4012 | U_BOOT_ENV_CALLBACK macro in your board or driver code. | |
4013 | ||
4014 | These callbacks are associated with variables in one of two ways. The | |
4015 | static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC | |
4016 | in the board configuration to a string that defines a list of | |
4017 | associations. The list must be in the following format: | |
4018 | ||
4019 | entry = variable_name[:callback_name] | |
4020 | list = entry[,list] | |
4021 | ||
4022 | If the callback name is not specified, then the callback is deleted. | |
4023 | Spaces are also allowed anywhere in the list. | |
4024 | ||
4025 | Callbacks can also be associated by defining the ".callbacks" variable | |
4026 | with the same list format above. Any association in ".callbacks" will | |
4027 | override any association in the static list. You can define | |
4028 | CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the | |
b445bbb4 | 4029 | ".callbacks" environment variable in the default or embedded environment. |
170ab110 | 4030 | |
bdf1fe4e JH |
4031 | If CONFIG_REGEX is defined, the variable_name above is evaluated as a |
4032 | regular expression. This allows multiple variables to be connected to | |
4033 | the same callback without explicitly listing them all out. | |
4034 | ||
170ab110 | 4035 | |
2729af9d WD |
4036 | Command Line Parsing: |
4037 | ===================== | |
f07771cc | 4038 | |
2729af9d WD |
4039 | There are two different command line parsers available with U-Boot: |
4040 | the old "simple" one, and the much more powerful "hush" shell: | |
c609719b | 4041 | |
2729af9d WD |
4042 | Old, simple command line parser: |
4043 | -------------------------------- | |
c609719b | 4044 | |
2729af9d WD |
4045 | - supports environment variables (through setenv / saveenv commands) |
4046 | - several commands on one line, separated by ';' | |
fe126d8b | 4047 | - variable substitution using "... ${name} ..." syntax |
2729af9d WD |
4048 | - special characters ('$', ';') can be escaped by prefixing with '\', |
4049 | for example: | |
fe126d8b | 4050 | setenv bootcmd bootm \${address} |
2729af9d WD |
4051 | - You can also escape text by enclosing in single apostrophes, for example: |
4052 | setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' | |
c609719b | 4053 | |
2729af9d WD |
4054 | Hush shell: |
4055 | ----------- | |
c609719b | 4056 | |
2729af9d WD |
4057 | - similar to Bourne shell, with control structures like |
4058 | if...then...else...fi, for...do...done; while...do...done, | |
4059 | until...do...done, ... | |
4060 | - supports environment ("global") variables (through setenv / saveenv | |
4061 | commands) and local shell variables (through standard shell syntax | |
4062 | "name=value"); only environment variables can be used with "run" | |
4063 | command | |
4064 | ||
4065 | General rules: | |
4066 | -------------- | |
c609719b | 4067 | |
2729af9d WD |
4068 | (1) If a command line (or an environment variable executed by a "run" |
4069 | command) contains several commands separated by semicolon, and | |
4070 | one of these commands fails, then the remaining commands will be | |
4071 | executed anyway. | |
c609719b | 4072 | |
2729af9d | 4073 | (2) If you execute several variables with one call to run (i. e. |
11ccc33f | 4074 | calling run with a list of variables as arguments), any failing |
2729af9d WD |
4075 | command will cause "run" to terminate, i. e. the remaining |
4076 | variables are not executed. | |
c609719b | 4077 | |
2729af9d WD |
4078 | Note for Redundant Ethernet Interfaces: |
4079 | ======================================= | |
c609719b | 4080 | |
11ccc33f | 4081 | Some boards come with redundant Ethernet interfaces; U-Boot supports |
2729af9d WD |
4082 | such configurations and is capable of automatic selection of a |
4083 | "working" interface when needed. MAC assignment works as follows: | |
c609719b | 4084 | |
2729af9d WD |
4085 | Network interfaces are numbered eth0, eth1, eth2, ... Corresponding |
4086 | MAC addresses can be stored in the environment as "ethaddr" (=>eth0), | |
4087 | "eth1addr" (=>eth1), "eth2addr", ... | |
c609719b | 4088 | |
2729af9d WD |
4089 | If the network interface stores some valid MAC address (for instance |
4090 | in SROM), this is used as default address if there is NO correspon- | |
4091 | ding setting in the environment; if the corresponding environment | |
4092 | variable is set, this overrides the settings in the card; that means: | |
c609719b | 4093 | |
2729af9d WD |
4094 | o If the SROM has a valid MAC address, and there is no address in the |
4095 | environment, the SROM's address is used. | |
c609719b | 4096 | |
2729af9d WD |
4097 | o If there is no valid address in the SROM, and a definition in the |
4098 | environment exists, then the value from the environment variable is | |
4099 | used. | |
c609719b | 4100 | |
2729af9d WD |
4101 | o If both the SROM and the environment contain a MAC address, and |
4102 | both addresses are the same, this MAC address is used. | |
c609719b | 4103 | |
2729af9d WD |
4104 | o If both the SROM and the environment contain a MAC address, and the |
4105 | addresses differ, the value from the environment is used and a | |
4106 | warning is printed. | |
c609719b | 4107 | |
2729af9d | 4108 | o If neither SROM nor the environment contain a MAC address, an error |
bef1014b JH |
4109 | is raised. If CONFIG_NET_RANDOM_ETHADDR is defined, then in this case |
4110 | a random, locally-assigned MAC is used. | |
c609719b | 4111 | |
ecee9324 | 4112 | If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses |
c0f40859 | 4113 | will be programmed into hardware as part of the initialization process. This |
ecee9324 BW |
4114 | may be skipped by setting the appropriate 'ethmacskip' environment variable. |
4115 | The naming convention is as follows: | |
4116 | "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. | |
c609719b | 4117 | |
2729af9d WD |
4118 | Image Formats: |
4119 | ============== | |
c609719b | 4120 | |
3310c549 MB |
4121 | U-Boot is capable of booting (and performing other auxiliary operations on) |
4122 | images in two formats: | |
4123 | ||
4124 | New uImage format (FIT) | |
4125 | ----------------------- | |
4126 | ||
4127 | Flexible and powerful format based on Flattened Image Tree -- FIT (similar | |
4128 | to Flattened Device Tree). It allows the use of images with multiple | |
4129 | components (several kernels, ramdisks, etc.), with contents protected by | |
4130 | SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. | |
4131 | ||
4132 | ||
4133 | Old uImage format | |
4134 | ----------------- | |
4135 | ||
4136 | Old image format is based on binary files which can be basically anything, | |
4137 | preceded by a special header; see the definitions in include/image.h for | |
4138 | details; basically, the header defines the following image properties: | |
c609719b | 4139 | |
2729af9d WD |
4140 | * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, |
4141 | 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, | |
f5ed9e39 PT |
4142 | LynxOS, pSOS, QNX, RTEMS, INTEGRITY; |
4143 | Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, | |
4144 | INTEGRITY). | |
daab59ac | 4145 | * Target CPU Architecture (Provisions for Alpha, ARM, Intel x86, |
afc1ce82 | 4146 | IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; |
daab59ac | 4147 | Currently supported: ARM, Intel x86, MIPS, NDS32, Nios II, PowerPC). |
2729af9d WD |
4148 | * Compression Type (uncompressed, gzip, bzip2) |
4149 | * Load Address | |
4150 | * Entry Point | |
4151 | * Image Name | |
4152 | * Image Timestamp | |
c609719b | 4153 | |
2729af9d WD |
4154 | The header is marked by a special Magic Number, and both the header |
4155 | and the data portions of the image are secured against corruption by | |
4156 | CRC32 checksums. | |
c609719b WD |
4157 | |
4158 | ||
2729af9d WD |
4159 | Linux Support: |
4160 | ============== | |
c609719b | 4161 | |
2729af9d WD |
4162 | Although U-Boot should support any OS or standalone application |
4163 | easily, the main focus has always been on Linux during the design of | |
4164 | U-Boot. | |
c609719b | 4165 | |
2729af9d WD |
4166 | U-Boot includes many features that so far have been part of some |
4167 | special "boot loader" code within the Linux kernel. Also, any | |
4168 | "initrd" images to be used are no longer part of one big Linux image; | |
4169 | instead, kernel and "initrd" are separate images. This implementation | |
4170 | serves several purposes: | |
c609719b | 4171 | |
2729af9d WD |
4172 | - the same features can be used for other OS or standalone |
4173 | applications (for instance: using compressed images to reduce the | |
4174 | Flash memory footprint) | |
c609719b | 4175 | |
2729af9d WD |
4176 | - it becomes much easier to port new Linux kernel versions because |
4177 | lots of low-level, hardware dependent stuff are done by U-Boot | |
c609719b | 4178 | |
2729af9d WD |
4179 | - the same Linux kernel image can now be used with different "initrd" |
4180 | images; of course this also means that different kernel images can | |
4181 | be run with the same "initrd". This makes testing easier (you don't | |
4182 | have to build a new "zImage.initrd" Linux image when you just | |
4183 | change a file in your "initrd"). Also, a field-upgrade of the | |
4184 | software is easier now. | |
c609719b | 4185 | |
c609719b | 4186 | |
2729af9d WD |
4187 | Linux HOWTO: |
4188 | ============ | |
c609719b | 4189 | |
2729af9d WD |
4190 | Porting Linux to U-Boot based systems: |
4191 | --------------------------------------- | |
c609719b | 4192 | |
2729af9d WD |
4193 | U-Boot cannot save you from doing all the necessary modifications to |
4194 | configure the Linux device drivers for use with your target hardware | |
4195 | (no, we don't intend to provide a full virtual machine interface to | |
4196 | Linux :-). | |
c609719b | 4197 | |
a47a12be | 4198 | But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). |
24ee89b9 | 4199 | |
2729af9d WD |
4200 | Just make sure your machine specific header file (for instance |
4201 | include/asm-ppc/tqm8xx.h) includes the same definition of the Board | |
1dc30693 MH |
4202 | Information structure as we define in include/asm-<arch>/u-boot.h, |
4203 | and make sure that your definition of IMAP_ADDR uses the same value | |
6d0f6bcf | 4204 | as your U-Boot configuration in CONFIG_SYS_IMMR. |
24ee89b9 | 4205 | |
2eb31b13 SG |
4206 | Note that U-Boot now has a driver model, a unified model for drivers. |
4207 | If you are adding a new driver, plumb it into driver model. If there | |
4208 | is no uclass available, you are encouraged to create one. See | |
4209 | doc/driver-model. | |
4210 | ||
c609719b | 4211 | |
2729af9d WD |
4212 | Configuring the Linux kernel: |
4213 | ----------------------------- | |
c609719b | 4214 | |
2729af9d WD |
4215 | No specific requirements for U-Boot. Make sure you have some root |
4216 | device (initial ramdisk, NFS) for your target system. | |
4217 | ||
4218 | ||
4219 | Building a Linux Image: | |
4220 | ----------------------- | |
c609719b | 4221 | |
2729af9d WD |
4222 | With U-Boot, "normal" build targets like "zImage" or "bzImage" are |
4223 | not used. If you use recent kernel source, a new build target | |
4224 | "uImage" will exist which automatically builds an image usable by | |
4225 | U-Boot. Most older kernels also have support for a "pImage" target, | |
4226 | which was introduced for our predecessor project PPCBoot and uses a | |
4227 | 100% compatible format. | |
4228 | ||
4229 | Example: | |
4230 | ||
ab584d67 | 4231 | make TQM850L_defconfig |
2729af9d WD |
4232 | make oldconfig |
4233 | make dep | |
4234 | make uImage | |
4235 | ||
4236 | The "uImage" build target uses a special tool (in 'tools/mkimage') to | |
4237 | encapsulate a compressed Linux kernel image with header information, | |
4238 | CRC32 checksum etc. for use with U-Boot. This is what we are doing: | |
4239 | ||
4240 | * build a standard "vmlinux" kernel image (in ELF binary format): | |
4241 | ||
4242 | * convert the kernel into a raw binary image: | |
4243 | ||
4244 | ${CROSS_COMPILE}-objcopy -O binary \ | |
4245 | -R .note -R .comment \ | |
4246 | -S vmlinux linux.bin | |
4247 | ||
4248 | * compress the binary image: | |
4249 | ||
4250 | gzip -9 linux.bin | |
4251 | ||
4252 | * package compressed binary image for U-Boot: | |
4253 | ||
4254 | mkimage -A ppc -O linux -T kernel -C gzip \ | |
4255 | -a 0 -e 0 -n "Linux Kernel Image" \ | |
4256 | -d linux.bin.gz uImage | |
c609719b | 4257 | |
c609719b | 4258 | |
2729af9d WD |
4259 | The "mkimage" tool can also be used to create ramdisk images for use |
4260 | with U-Boot, either separated from the Linux kernel image, or | |
4261 | combined into one file. "mkimage" encapsulates the images with a 64 | |
4262 | byte header containing information about target architecture, | |
4263 | operating system, image type, compression method, entry points, time | |
4264 | stamp, CRC32 checksums, etc. | |
4265 | ||
4266 | "mkimage" can be called in two ways: to verify existing images and | |
4267 | print the header information, or to build new images. | |
4268 | ||
4269 | In the first form (with "-l" option) mkimage lists the information | |
4270 | contained in the header of an existing U-Boot image; this includes | |
4271 | checksum verification: | |
c609719b | 4272 | |
2729af9d WD |
4273 | tools/mkimage -l image |
4274 | -l ==> list image header information | |
4275 | ||
4276 | The second form (with "-d" option) is used to build a U-Boot image | |
4277 | from a "data file" which is used as image payload: | |
4278 | ||
4279 | tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ | |
4280 | -n name -d data_file image | |
4281 | -A ==> set architecture to 'arch' | |
4282 | -O ==> set operating system to 'os' | |
4283 | -T ==> set image type to 'type' | |
4284 | -C ==> set compression type 'comp' | |
4285 | -a ==> set load address to 'addr' (hex) | |
4286 | -e ==> set entry point to 'ep' (hex) | |
4287 | -n ==> set image name to 'name' | |
4288 | -d ==> use image data from 'datafile' | |
4289 | ||
69459791 WD |
4290 | Right now, all Linux kernels for PowerPC systems use the same load |
4291 | address (0x00000000), but the entry point address depends on the | |
4292 | kernel version: | |
2729af9d WD |
4293 | |
4294 | - 2.2.x kernels have the entry point at 0x0000000C, | |
4295 | - 2.3.x and later kernels have the entry point at 0x00000000. | |
4296 | ||
4297 | So a typical call to build a U-Boot image would read: | |
4298 | ||
4299 | -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ | |
4300 | > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ | |
a47a12be | 4301 | > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ |
2729af9d WD |
4302 | > examples/uImage.TQM850L |
4303 | Image Name: 2.4.4 kernel for TQM850L | |
4304 | Created: Wed Jul 19 02:34:59 2000 | |
4305 | Image Type: PowerPC Linux Kernel Image (gzip compressed) | |
4306 | Data Size: 335725 Bytes = 327.86 kB = 0.32 MB | |
4307 | Load Address: 0x00000000 | |
4308 | Entry Point: 0x00000000 | |
4309 | ||
4310 | To verify the contents of the image (or check for corruption): | |
4311 | ||
4312 | -> tools/mkimage -l examples/uImage.TQM850L | |
4313 | Image Name: 2.4.4 kernel for TQM850L | |
4314 | Created: Wed Jul 19 02:34:59 2000 | |
4315 | Image Type: PowerPC Linux Kernel Image (gzip compressed) | |
4316 | Data Size: 335725 Bytes = 327.86 kB = 0.32 MB | |
4317 | Load Address: 0x00000000 | |
4318 | Entry Point: 0x00000000 | |
4319 | ||
4320 | NOTE: for embedded systems where boot time is critical you can trade | |
4321 | speed for memory and install an UNCOMPRESSED image instead: this | |
4322 | needs more space in Flash, but boots much faster since it does not | |
4323 | need to be uncompressed: | |
4324 | ||
a47a12be | 4325 | -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz |
2729af9d WD |
4326 | -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ |
4327 | > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ | |
a47a12be | 4328 | > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \ |
2729af9d WD |
4329 | > examples/uImage.TQM850L-uncompressed |
4330 | Image Name: 2.4.4 kernel for TQM850L | |
4331 | Created: Wed Jul 19 02:34:59 2000 | |
4332 | Image Type: PowerPC Linux Kernel Image (uncompressed) | |
4333 | Data Size: 792160 Bytes = 773.59 kB = 0.76 MB | |
4334 | Load Address: 0x00000000 | |
4335 | Entry Point: 0x00000000 | |
4336 | ||
4337 | ||
4338 | Similar you can build U-Boot images from a 'ramdisk.image.gz' file | |
4339 | when your kernel is intended to use an initial ramdisk: | |
4340 | ||
4341 | -> tools/mkimage -n 'Simple Ramdisk Image' \ | |
4342 | > -A ppc -O linux -T ramdisk -C gzip \ | |
4343 | > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd | |
4344 | Image Name: Simple Ramdisk Image | |
4345 | Created: Wed Jan 12 14:01:50 2000 | |
4346 | Image Type: PowerPC Linux RAMDisk Image (gzip compressed) | |
4347 | Data Size: 566530 Bytes = 553.25 kB = 0.54 MB | |
4348 | Load Address: 0x00000000 | |
4349 | Entry Point: 0x00000000 | |
4350 | ||
a804b5ce GMF |
4351 | The "dumpimage" is a tool to disassemble images built by mkimage. Its "-i" |
4352 | option performs the converse operation of the mkimage's second form (the "-d" | |
4353 | option). Given an image built by mkimage, the dumpimage extracts a "data file" | |
4354 | from the image: | |
4355 | ||
f41f5b7c GMF |
4356 | tools/dumpimage -i image -T type -p position data_file |
4357 | -i ==> extract from the 'image' a specific 'data_file' | |
4358 | -T ==> set image type to 'type' | |
4359 | -p ==> 'position' (starting at 0) of the 'data_file' inside the 'image' | |
a804b5ce | 4360 | |
2729af9d WD |
4361 | |
4362 | Installing a Linux Image: | |
4363 | ------------------------- | |
4364 | ||
4365 | To downloading a U-Boot image over the serial (console) interface, | |
4366 | you must convert the image to S-Record format: | |
4367 | ||
4368 | objcopy -I binary -O srec examples/image examples/image.srec | |
4369 | ||
4370 | The 'objcopy' does not understand the information in the U-Boot | |
4371 | image header, so the resulting S-Record file will be relative to | |
4372 | address 0x00000000. To load it to a given address, you need to | |
4373 | specify the target address as 'offset' parameter with the 'loads' | |
4374 | command. | |
4375 | ||
4376 | Example: install the image to address 0x40100000 (which on the | |
4377 | TQM8xxL is in the first Flash bank): | |
4378 | ||
4379 | => erase 40100000 401FFFFF | |
4380 | ||
4381 | .......... done | |
4382 | Erased 8 sectors | |
4383 | ||
4384 | => loads 40100000 | |
4385 | ## Ready for S-Record download ... | |
4386 | ~>examples/image.srec | |
4387 | 1 2 3 4 5 6 7 8 9 10 11 12 13 ... | |
4388 | ... | |
4389 | 15989 15990 15991 15992 | |
4390 | [file transfer complete] | |
4391 | [connected] | |
4392 | ## Start Addr = 0x00000000 | |
4393 | ||
4394 | ||
4395 | You can check the success of the download using the 'iminfo' command; | |
218ca724 | 4396 | this includes a checksum verification so you can be sure no data |
2729af9d WD |
4397 | corruption happened: |
4398 | ||
4399 | => imi 40100000 | |
4400 | ||
4401 | ## Checking Image at 40100000 ... | |
4402 | Image Name: 2.2.13 for initrd on TQM850L | |
4403 | Image Type: PowerPC Linux Kernel Image (gzip compressed) | |
4404 | Data Size: 335725 Bytes = 327 kB = 0 MB | |
4405 | Load Address: 00000000 | |
4406 | Entry Point: 0000000c | |
4407 | Verifying Checksum ... OK | |
4408 | ||
4409 | ||
4410 | Boot Linux: | |
4411 | ----------- | |
4412 | ||
4413 | The "bootm" command is used to boot an application that is stored in | |
4414 | memory (RAM or Flash). In case of a Linux kernel image, the contents | |
4415 | of the "bootargs" environment variable is passed to the kernel as | |
4416 | parameters. You can check and modify this variable using the | |
4417 | "printenv" and "setenv" commands: | |
4418 | ||
4419 | ||
4420 | => printenv bootargs | |
4421 | bootargs=root=/dev/ram | |
4422 | ||
4423 | => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 | |
4424 | ||
4425 | => printenv bootargs | |
4426 | bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 | |
4427 | ||
4428 | => bootm 40020000 | |
4429 | ## Booting Linux kernel at 40020000 ... | |
4430 | Image Name: 2.2.13 for NFS on TQM850L | |
4431 | Image Type: PowerPC Linux Kernel Image (gzip compressed) | |
4432 | Data Size: 381681 Bytes = 372 kB = 0 MB | |
4433 | Load Address: 00000000 | |
4434 | Entry Point: 0000000c | |
4435 | Verifying Checksum ... OK | |
4436 | Uncompressing Kernel Image ... OK | |
4437 | Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000 | |
4438 | Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 | |
4439 | time_init: decrementer frequency = 187500000/60 | |
4440 | Calibrating delay loop... 49.77 BogoMIPS | |
4441 | Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] | |
4442 | ... | |
4443 | ||
11ccc33f | 4444 | If you want to boot a Linux kernel with initial RAM disk, you pass |
2729af9d WD |
4445 | the memory addresses of both the kernel and the initrd image (PPBCOOT |
4446 | format!) to the "bootm" command: | |
4447 | ||
4448 | => imi 40100000 40200000 | |
4449 | ||
4450 | ## Checking Image at 40100000 ... | |
4451 | Image Name: 2.2.13 for initrd on TQM850L | |
4452 | Image Type: PowerPC Linux Kernel Image (gzip compressed) | |
4453 | Data Size: 335725 Bytes = 327 kB = 0 MB | |
4454 | Load Address: 00000000 | |
4455 | Entry Point: 0000000c | |
4456 | Verifying Checksum ... OK | |
4457 | ||
4458 | ## Checking Image at 40200000 ... | |
4459 | Image Name: Simple Ramdisk Image | |
4460 | Image Type: PowerPC Linux RAMDisk Image (gzip compressed) | |
4461 | Data Size: 566530 Bytes = 553 kB = 0 MB | |
4462 | Load Address: 00000000 | |
4463 | Entry Point: 00000000 | |
4464 | Verifying Checksum ... OK | |
4465 | ||
4466 | => bootm 40100000 40200000 | |
4467 | ## Booting Linux kernel at 40100000 ... | |
4468 | Image Name: 2.2.13 for initrd on TQM850L | |
4469 | Image Type: PowerPC Linux Kernel Image (gzip compressed) | |
4470 | Data Size: 335725 Bytes = 327 kB = 0 MB | |
4471 | Load Address: 00000000 | |
4472 | Entry Point: 0000000c | |
4473 | Verifying Checksum ... OK | |
4474 | Uncompressing Kernel Image ... OK | |
4475 | ## Loading RAMDisk Image at 40200000 ... | |
4476 | Image Name: Simple Ramdisk Image | |
4477 | Image Type: PowerPC Linux RAMDisk Image (gzip compressed) | |
4478 | Data Size: 566530 Bytes = 553 kB = 0 MB | |
4479 | Load Address: 00000000 | |
4480 | Entry Point: 00000000 | |
4481 | Verifying Checksum ... OK | |
4482 | Loading Ramdisk ... OK | |
4483 | Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000 | |
4484 | Boot arguments: root=/dev/ram | |
4485 | time_init: decrementer frequency = 187500000/60 | |
4486 | Calibrating delay loop... 49.77 BogoMIPS | |
4487 | ... | |
4488 | RAMDISK: Compressed image found at block 0 | |
4489 | VFS: Mounted root (ext2 filesystem). | |
4490 | ||
4491 | bash# | |
4492 | ||
0267768e MM |
4493 | Boot Linux and pass a flat device tree: |
4494 | ----------- | |
4495 | ||
4496 | First, U-Boot must be compiled with the appropriate defines. See the section | |
4497 | titled "Linux Kernel Interface" above for a more in depth explanation. The | |
4498 | following is an example of how to start a kernel and pass an updated | |
4499 | flat device tree: | |
4500 | ||
4501 | => print oftaddr | |
4502 | oftaddr=0x300000 | |
4503 | => print oft | |
4504 | oft=oftrees/mpc8540ads.dtb | |
4505 | => tftp $oftaddr $oft | |
4506 | Speed: 1000, full duplex | |
4507 | Using TSEC0 device | |
4508 | TFTP from server 192.168.1.1; our IP address is 192.168.1.101 | |
4509 | Filename 'oftrees/mpc8540ads.dtb'. | |
4510 | Load address: 0x300000 | |
4511 | Loading: # | |
4512 | done | |
4513 | Bytes transferred = 4106 (100a hex) | |
4514 | => tftp $loadaddr $bootfile | |
4515 | Speed: 1000, full duplex | |
4516 | Using TSEC0 device | |
4517 | TFTP from server 192.168.1.1; our IP address is 192.168.1.2 | |
4518 | Filename 'uImage'. | |
4519 | Load address: 0x200000 | |
4520 | Loading:############ | |
4521 | done | |
4522 | Bytes transferred = 1029407 (fb51f hex) | |
4523 | => print loadaddr | |
4524 | loadaddr=200000 | |
4525 | => print oftaddr | |
4526 | oftaddr=0x300000 | |
4527 | => bootm $loadaddr - $oftaddr | |
4528 | ## Booting image at 00200000 ... | |
a9398e01 WD |
4529 | Image Name: Linux-2.6.17-dirty |
4530 | Image Type: PowerPC Linux Kernel Image (gzip compressed) | |
4531 | Data Size: 1029343 Bytes = 1005.2 kB | |
0267768e | 4532 | Load Address: 00000000 |
a9398e01 | 4533 | Entry Point: 00000000 |
0267768e MM |
4534 | Verifying Checksum ... OK |
4535 | Uncompressing Kernel Image ... OK | |
4536 | Booting using flat device tree at 0x300000 | |
4537 | Using MPC85xx ADS machine description | |
4538 | Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb | |
4539 | [snip] | |
4540 | ||
4541 | ||
2729af9d WD |
4542 | More About U-Boot Image Types: |
4543 | ------------------------------ | |
4544 | ||
4545 | U-Boot supports the following image types: | |
4546 | ||
4547 | "Standalone Programs" are directly runnable in the environment | |
4548 | provided by U-Boot; it is expected that (if they behave | |
4549 | well) you can continue to work in U-Boot after return from | |
4550 | the Standalone Program. | |
4551 | "OS Kernel Images" are usually images of some Embedded OS which | |
4552 | will take over control completely. Usually these programs | |
4553 | will install their own set of exception handlers, device | |
4554 | drivers, set up the MMU, etc. - this means, that you cannot | |
4555 | expect to re-enter U-Boot except by resetting the CPU. | |
4556 | "RAMDisk Images" are more or less just data blocks, and their | |
4557 | parameters (address, size) are passed to an OS kernel that is | |
4558 | being started. | |
4559 | "Multi-File Images" contain several images, typically an OS | |
4560 | (Linux) kernel image and one or more data images like | |
4561 | RAMDisks. This construct is useful for instance when you want | |
4562 | to boot over the network using BOOTP etc., where the boot | |
4563 | server provides just a single image file, but you want to get | |
4564 | for instance an OS kernel and a RAMDisk image. | |
4565 | ||
4566 | "Multi-File Images" start with a list of image sizes, each | |
4567 | image size (in bytes) specified by an "uint32_t" in network | |
4568 | byte order. This list is terminated by an "(uint32_t)0". | |
4569 | Immediately after the terminating 0 follow the images, one by | |
4570 | one, all aligned on "uint32_t" boundaries (size rounded up to | |
4571 | a multiple of 4 bytes). | |
4572 | ||
4573 | "Firmware Images" are binary images containing firmware (like | |
4574 | U-Boot or FPGA images) which usually will be programmed to | |
4575 | flash memory. | |
4576 | ||
4577 | "Script files" are command sequences that will be executed by | |
4578 | U-Boot's command interpreter; this feature is especially | |
4579 | useful when you configure U-Boot to use a real shell (hush) | |
4580 | as command interpreter. | |
4581 | ||
44f074c7 MV |
4582 | Booting the Linux zImage: |
4583 | ------------------------- | |
4584 | ||
4585 | On some platforms, it's possible to boot Linux zImage. This is done | |
4586 | using the "bootz" command. The syntax of "bootz" command is the same | |
4587 | as the syntax of "bootm" command. | |
4588 | ||
8ac28563 | 4589 | Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply |
017e1f3f MV |
4590 | kernel with raw initrd images. The syntax is slightly different, the |
4591 | address of the initrd must be augmented by it's size, in the following | |
4592 | format: "<initrd addres>:<initrd size>". | |
4593 | ||
2729af9d WD |
4594 | |
4595 | Standalone HOWTO: | |
4596 | ================= | |
4597 | ||
4598 | One of the features of U-Boot is that you can dynamically load and | |
4599 | run "standalone" applications, which can use some resources of | |
4600 | U-Boot like console I/O functions or interrupt services. | |
4601 | ||
4602 | Two simple examples are included with the sources: | |
4603 | ||
4604 | "Hello World" Demo: | |
4605 | ------------------- | |
4606 | ||
4607 | 'examples/hello_world.c' contains a small "Hello World" Demo | |
4608 | application; it is automatically compiled when you build U-Boot. | |
4609 | It's configured to run at address 0x00040004, so you can play with it | |
4610 | like that: | |
4611 | ||
4612 | => loads | |
4613 | ## Ready for S-Record download ... | |
4614 | ~>examples/hello_world.srec | |
4615 | 1 2 3 4 5 6 7 8 9 10 11 ... | |
4616 | [file transfer complete] | |
4617 | [connected] | |
4618 | ## Start Addr = 0x00040004 | |
4619 | ||
4620 | => go 40004 Hello World! This is a test. | |
4621 | ## Starting application at 0x00040004 ... | |
4622 | Hello World | |
4623 | argc = 7 | |
4624 | argv[0] = "40004" | |
4625 | argv[1] = "Hello" | |
4626 | argv[2] = "World!" | |
4627 | argv[3] = "This" | |
4628 | argv[4] = "is" | |
4629 | argv[5] = "a" | |
4630 | argv[6] = "test." | |
4631 | argv[7] = "<NULL>" | |
4632 | Hit any key to exit ... | |
4633 | ||
4634 | ## Application terminated, rc = 0x0 | |
4635 | ||
4636 | Another example, which demonstrates how to register a CPM interrupt | |
4637 | handler with the U-Boot code, can be found in 'examples/timer.c'. | |
4638 | Here, a CPM timer is set up to generate an interrupt every second. | |
4639 | The interrupt service routine is trivial, just printing a '.' | |
4640 | character, but this is just a demo program. The application can be | |
4641 | controlled by the following keys: | |
4642 | ||
4643 | ? - print current values og the CPM Timer registers | |
4644 | b - enable interrupts and start timer | |
4645 | e - stop timer and disable interrupts | |
4646 | q - quit application | |
4647 | ||
4648 | => loads | |
4649 | ## Ready for S-Record download ... | |
4650 | ~>examples/timer.srec | |
4651 | 1 2 3 4 5 6 7 8 9 10 11 ... | |
4652 | [file transfer complete] | |
4653 | [connected] | |
4654 | ## Start Addr = 0x00040004 | |
4655 | ||
4656 | => go 40004 | |
4657 | ## Starting application at 0x00040004 ... | |
4658 | TIMERS=0xfff00980 | |
4659 | Using timer 1 | |
4660 | tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 | |
4661 | ||
4662 | Hit 'b': | |
4663 | [q, b, e, ?] Set interval 1000000 us | |
4664 | Enabling timer | |
4665 | Hit '?': | |
4666 | [q, b, e, ?] ........ | |
4667 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 | |
4668 | Hit '?': | |
4669 | [q, b, e, ?] . | |
4670 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 | |
4671 | Hit '?': | |
4672 | [q, b, e, ?] . | |
4673 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 | |
4674 | Hit '?': | |
4675 | [q, b, e, ?] . | |
4676 | tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 | |
4677 | Hit 'e': | |
4678 | [q, b, e, ?] ...Stopping timer | |
4679 | Hit 'q': | |
4680 | [q, b, e, ?] ## Application terminated, rc = 0x0 | |
4681 | ||
4682 | ||
4683 | Minicom warning: | |
4684 | ================ | |
4685 | ||
4686 | Over time, many people have reported problems when trying to use the | |
4687 | "minicom" terminal emulation program for serial download. I (wd) | |
4688 | consider minicom to be broken, and recommend not to use it. Under | |
4689 | Unix, I recommend to use C-Kermit for general purpose use (and | |
4690 | especially for kermit binary protocol download ("loadb" command), and | |
e53515a2 KP |
4691 | use "cu" for S-Record download ("loads" command). See |
4692 | http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3. | |
4693 | for help with kermit. | |
4694 | ||
2729af9d WD |
4695 | |
4696 | Nevertheless, if you absolutely want to use it try adding this | |
4697 | configuration to your "File transfer protocols" section: | |
4698 | ||
4699 | Name Program Name U/D FullScr IO-Red. Multi | |
4700 | X kermit /usr/bin/kermit -i -l %l -s Y U Y N N | |
4701 | Y kermit /usr/bin/kermit -i -l %l -r N D Y N N | |
4702 | ||
4703 | ||
4704 | NetBSD Notes: | |
4705 | ============= | |
4706 | ||
4707 | Starting at version 0.9.2, U-Boot supports NetBSD both as host | |
4708 | (build U-Boot) and target system (boots NetBSD/mpc8xx). | |
4709 | ||
4710 | Building requires a cross environment; it is known to work on | |
4711 | NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also | |
4712 | need gmake since the Makefiles are not compatible with BSD make). | |
4713 | Note that the cross-powerpc package does not install include files; | |
4714 | attempting to build U-Boot will fail because <machine/ansi.h> is | |
4715 | missing. This file has to be installed and patched manually: | |
4716 | ||
4717 | # cd /usr/pkg/cross/powerpc-netbsd/include | |
4718 | # mkdir powerpc | |
4719 | # ln -s powerpc machine | |
4720 | # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h | |
4721 | # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST | |
4722 | ||
4723 | Native builds *don't* work due to incompatibilities between native | |
4724 | and U-Boot include files. | |
4725 | ||
4726 | Booting assumes that (the first part of) the image booted is a | |
4727 | stage-2 loader which in turn loads and then invokes the kernel | |
4728 | proper. Loader sources will eventually appear in the NetBSD source | |
4729 | tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the | |
2a8af187 | 4730 | meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz |
2729af9d WD |
4731 | |
4732 | ||
4733 | Implementation Internals: | |
4734 | ========================= | |
4735 | ||
4736 | The following is not intended to be a complete description of every | |
4737 | implementation detail. However, it should help to understand the | |
4738 | inner workings of U-Boot and make it easier to port it to custom | |
4739 | hardware. | |
4740 | ||
4741 | ||
4742 | Initial Stack, Global Data: | |
4743 | --------------------------- | |
4744 | ||
4745 | The implementation of U-Boot is complicated by the fact that U-Boot | |
4746 | starts running out of ROM (flash memory), usually without access to | |
4747 | system RAM (because the memory controller is not initialized yet). | |
4748 | This means that we don't have writable Data or BSS segments, and BSS | |
4749 | is not initialized as zero. To be able to get a C environment working | |
4750 | at all, we have to allocate at least a minimal stack. Implementation | |
4751 | options for this are defined and restricted by the CPU used: Some CPU | |
4752 | models provide on-chip memory (like the IMMR area on MPC8xx and | |
4753 | MPC826x processors), on others (parts of) the data cache can be | |
4754 | locked as (mis-) used as memory, etc. | |
4755 | ||
218ca724 | 4756 | Chris Hallinan posted a good summary of these issues to the |
0668236b | 4757 | U-Boot mailing list: |
2729af9d WD |
4758 | |
4759 | Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? | |
4760 | From: "Chris Hallinan" <clh@net1plus.com> | |
4761 | Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) | |
4762 | ... | |
4763 | ||
4764 | Correct me if I'm wrong, folks, but the way I understand it | |
4765 | is this: Using DCACHE as initial RAM for Stack, etc, does not | |
4766 | require any physical RAM backing up the cache. The cleverness | |
4767 | is that the cache is being used as a temporary supply of | |
4768 | necessary storage before the SDRAM controller is setup. It's | |
11ccc33f | 4769 | beyond the scope of this list to explain the details, but you |
2729af9d WD |
4770 | can see how this works by studying the cache architecture and |
4771 | operation in the architecture and processor-specific manuals. | |
4772 | ||
4773 | OCM is On Chip Memory, which I believe the 405GP has 4K. It | |
4774 | is another option for the system designer to use as an | |
11ccc33f | 4775 | initial stack/RAM area prior to SDRAM being available. Either |
2729af9d WD |
4776 | option should work for you. Using CS 4 should be fine if your |
4777 | board designers haven't used it for something that would | |
4778 | cause you grief during the initial boot! It is frequently not | |
4779 | used. | |
4780 | ||
6d0f6bcf | 4781 | CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere |
2729af9d WD |
4782 | with your processor/board/system design. The default value |
4783 | you will find in any recent u-boot distribution in | |
8a316c9b | 4784 | walnut.h should work for you. I'd set it to a value larger |
2729af9d WD |
4785 | than your SDRAM module. If you have a 64MB SDRAM module, set |
4786 | it above 400_0000. Just make sure your board has no resources | |
4787 | that are supposed to respond to that address! That code in | |
4788 | start.S has been around a while and should work as is when | |
4789 | you get the config right. | |
4790 | ||
4791 | -Chris Hallinan | |
4792 | DS4.COM, Inc. | |
4793 | ||
4794 | It is essential to remember this, since it has some impact on the C | |
4795 | code for the initialization procedures: | |
4796 | ||
4797 | * Initialized global data (data segment) is read-only. Do not attempt | |
4798 | to write it. | |
4799 | ||
b445bbb4 | 4800 | * Do not use any uninitialized global data (or implicitly initialized |
2729af9d WD |
4801 | as zero data - BSS segment) at all - this is undefined, initiali- |
4802 | zation is performed later (when relocating to RAM). | |
4803 | ||
4804 | * Stack space is very limited. Avoid big data buffers or things like | |
4805 | that. | |
4806 | ||
4807 | Having only the stack as writable memory limits means we cannot use | |
b445bbb4 | 4808 | normal global data to share information between the code. But it |
2729af9d WD |
4809 | turned out that the implementation of U-Boot can be greatly |
4810 | simplified by making a global data structure (gd_t) available to all | |
4811 | functions. We could pass a pointer to this data as argument to _all_ | |
4812 | functions, but this would bloat the code. Instead we use a feature of | |
4813 | the GCC compiler (Global Register Variables) to share the data: we | |
4814 | place a pointer (gd) to the global data into a register which we | |
4815 | reserve for this purpose. | |
4816 | ||
4817 | When choosing a register for such a purpose we are restricted by the | |
4818 | relevant (E)ABI specifications for the current architecture, and by | |
4819 | GCC's implementation. | |
4820 | ||
4821 | For PowerPC, the following registers have specific use: | |
4822 | R1: stack pointer | |
e7670f6c | 4823 | R2: reserved for system use |
2729af9d WD |
4824 | R3-R4: parameter passing and return values |
4825 | R5-R10: parameter passing | |
4826 | R13: small data area pointer | |
4827 | R30: GOT pointer | |
4828 | R31: frame pointer | |
4829 | ||
e6bee808 JT |
4830 | (U-Boot also uses R12 as internal GOT pointer. r12 |
4831 | is a volatile register so r12 needs to be reset when | |
4832 | going back and forth between asm and C) | |
2729af9d | 4833 | |
e7670f6c | 4834 | ==> U-Boot will use R2 to hold a pointer to the global data |
2729af9d WD |
4835 | |
4836 | Note: on PPC, we could use a static initializer (since the | |
4837 | address of the global data structure is known at compile time), | |
4838 | but it turned out that reserving a register results in somewhat | |
4839 | smaller code - although the code savings are not that big (on | |
4840 | average for all boards 752 bytes for the whole U-Boot image, | |
4841 | 624 text + 127 data). | |
4842 | ||
4843 | On ARM, the following registers are used: | |
4844 | ||
4845 | R0: function argument word/integer result | |
4846 | R1-R3: function argument word | |
12eba1b4 JH |
4847 | R9: platform specific |
4848 | R10: stack limit (used only if stack checking is enabled) | |
2729af9d WD |
4849 | R11: argument (frame) pointer |
4850 | R12: temporary workspace | |
4851 | R13: stack pointer | |
4852 | R14: link register | |
4853 | R15: program counter | |
4854 | ||
12eba1b4 JH |
4855 | ==> U-Boot will use R9 to hold a pointer to the global data |
4856 | ||
4857 | Note: on ARM, only R_ARM_RELATIVE relocations are supported. | |
2729af9d | 4858 | |
0df01fd3 TC |
4859 | On Nios II, the ABI is documented here: |
4860 | http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf | |
4861 | ||
4862 | ==> U-Boot will use gp to hold a pointer to the global data | |
4863 | ||
4864 | Note: on Nios II, we give "-G0" option to gcc and don't use gp | |
4865 | to access small data sections, so gp is free. | |
4866 | ||
afc1ce82 ML |
4867 | On NDS32, the following registers are used: |
4868 | ||
4869 | R0-R1: argument/return | |
4870 | R2-R5: argument | |
4871 | R15: temporary register for assembler | |
4872 | R16: trampoline register | |
4873 | R28: frame pointer (FP) | |
4874 | R29: global pointer (GP) | |
4875 | R30: link register (LP) | |
4876 | R31: stack pointer (SP) | |
4877 | PC: program counter (PC) | |
4878 | ||
4879 | ==> U-Boot will use R10 to hold a pointer to the global data | |
4880 | ||
d87080b7 WD |
4881 | NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, |
4882 | or current versions of GCC may "optimize" the code too much. | |
2729af9d | 4883 | |
3fafced7 RC |
4884 | On RISC-V, the following registers are used: |
4885 | ||
4886 | x0: hard-wired zero (zero) | |
4887 | x1: return address (ra) | |
4888 | x2: stack pointer (sp) | |
4889 | x3: global pointer (gp) | |
4890 | x4: thread pointer (tp) | |
4891 | x5: link register (t0) | |
4892 | x8: frame pointer (fp) | |
4893 | x10-x11: arguments/return values (a0-1) | |
4894 | x12-x17: arguments (a2-7) | |
4895 | x28-31: temporaries (t3-6) | |
4896 | pc: program counter (pc) | |
4897 | ||
4898 | ==> U-Boot will use gp to hold a pointer to the global data | |
4899 | ||
2729af9d WD |
4900 | Memory Management: |
4901 | ------------------ | |
4902 | ||
4903 | U-Boot runs in system state and uses physical addresses, i.e. the | |
4904 | MMU is not used either for address mapping nor for memory protection. | |
4905 | ||
4906 | The available memory is mapped to fixed addresses using the memory | |
4907 | controller. In this process, a contiguous block is formed for each | |
4908 | memory type (Flash, SDRAM, SRAM), even when it consists of several | |
4909 | physical memory banks. | |
4910 | ||
4911 | U-Boot is installed in the first 128 kB of the first Flash bank (on | |
4912 | TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After | |
4913 | booting and sizing and initializing DRAM, the code relocates itself | |
4914 | to the upper end of DRAM. Immediately below the U-Boot code some | |
6d0f6bcf | 4915 | memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN |
2729af9d WD |
4916 | configuration setting]. Below that, a structure with global Board |
4917 | Info data is placed, followed by the stack (growing downward). | |
4918 | ||
4919 | Additionally, some exception handler code is copied to the low 8 kB | |
4920 | of DRAM (0x00000000 ... 0x00001FFF). | |
4921 | ||
4922 | So a typical memory configuration with 16 MB of DRAM could look like | |
4923 | this: | |
4924 | ||
4925 | 0x0000 0000 Exception Vector code | |
4926 | : | |
4927 | 0x0000 1FFF | |
4928 | 0x0000 2000 Free for Application Use | |
4929 | : | |
4930 | : | |
4931 | ||
4932 | : | |
4933 | : | |
4934 | 0x00FB FF20 Monitor Stack (Growing downward) | |
4935 | 0x00FB FFAC Board Info Data and permanent copy of global data | |
4936 | 0x00FC 0000 Malloc Arena | |
4937 | : | |
4938 | 0x00FD FFFF | |
4939 | 0x00FE 0000 RAM Copy of Monitor Code | |
4940 | ... eventually: LCD or video framebuffer | |
4941 | ... eventually: pRAM (Protected RAM - unchanged by reset) | |
4942 | 0x00FF FFFF [End of RAM] | |
4943 | ||
4944 | ||
4945 | System Initialization: | |
4946 | ---------------------- | |
c609719b | 4947 | |
2729af9d | 4948 | In the reset configuration, U-Boot starts at the reset entry point |
11ccc33f | 4949 | (on most PowerPC systems at address 0x00000100). Because of the reset |
b445bbb4 | 4950 | configuration for CS0# this is a mirror of the on board Flash memory. |
2729af9d WD |
4951 | To be able to re-map memory U-Boot then jumps to its link address. |
4952 | To be able to implement the initialization code in C, a (small!) | |
4953 | initial stack is set up in the internal Dual Ported RAM (in case CPUs | |
2eb48ff7 HS |
4954 | which provide such a feature like), or in a locked part of the data |
4955 | cache. After that, U-Boot initializes the CPU core, the caches and | |
4956 | the SIU. | |
2729af9d WD |
4957 | |
4958 | Next, all (potentially) available memory banks are mapped using a | |
4959 | preliminary mapping. For example, we put them on 512 MB boundaries | |
4960 | (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash | |
4961 | on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is | |
4962 | programmed for SDRAM access. Using the temporary configuration, a | |
4963 | simple memory test is run that determines the size of the SDRAM | |
4964 | banks. | |
4965 | ||
4966 | When there is more than one SDRAM bank, and the banks are of | |
4967 | different size, the largest is mapped first. For equal size, the first | |
4968 | bank (CS2#) is mapped first. The first mapping is always for address | |
4969 | 0x00000000, with any additional banks following immediately to create | |
4970 | contiguous memory starting from 0. | |
4971 | ||
4972 | Then, the monitor installs itself at the upper end of the SDRAM area | |
4973 | and allocates memory for use by malloc() and for the global Board | |
4974 | Info data; also, the exception vector code is copied to the low RAM | |
4975 | pages, and the final stack is set up. | |
4976 | ||
4977 | Only after this relocation will you have a "normal" C environment; | |
4978 | until that you are restricted in several ways, mostly because you are | |
4979 | running from ROM, and because the code will have to be relocated to a | |
4980 | new address in RAM. | |
4981 | ||
4982 | ||
4983 | U-Boot Porting Guide: | |
4984 | ---------------------- | |
c609719b | 4985 | |
2729af9d WD |
4986 | [Based on messages by Jerry Van Baren in the U-Boot-Users mailing |
4987 | list, October 2002] | |
c609719b WD |
4988 | |
4989 | ||
6c3fef28 | 4990 | int main(int argc, char *argv[]) |
2729af9d WD |
4991 | { |
4992 | sighandler_t no_more_time; | |
c609719b | 4993 | |
6c3fef28 JVB |
4994 | signal(SIGALRM, no_more_time); |
4995 | alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); | |
c609719b | 4996 | |
2729af9d | 4997 | if (available_money > available_manpower) { |
6c3fef28 | 4998 | Pay consultant to port U-Boot; |
c609719b WD |
4999 | return 0; |
5000 | } | |
5001 | ||
2729af9d WD |
5002 | Download latest U-Boot source; |
5003 | ||
0668236b | 5004 | Subscribe to u-boot mailing list; |
2729af9d | 5005 | |
6c3fef28 JVB |
5006 | if (clueless) |
5007 | email("Hi, I am new to U-Boot, how do I get started?"); | |
2729af9d WD |
5008 | |
5009 | while (learning) { | |
5010 | Read the README file in the top level directory; | |
6c3fef28 JVB |
5011 | Read http://www.denx.de/twiki/bin/view/DULG/Manual; |
5012 | Read applicable doc/*.README; | |
2729af9d | 5013 | Read the source, Luke; |
6c3fef28 | 5014 | /* find . -name "*.[chS]" | xargs grep -i <keyword> */ |
2729af9d WD |
5015 | } |
5016 | ||
6c3fef28 JVB |
5017 | if (available_money > toLocalCurrency ($2500)) |
5018 | Buy a BDI3000; | |
5019 | else | |
2729af9d | 5020 | Add a lot of aggravation and time; |
2729af9d | 5021 | |
6c3fef28 JVB |
5022 | if (a similar board exists) { /* hopefully... */ |
5023 | cp -a board/<similar> board/<myboard> | |
5024 | cp include/configs/<similar>.h include/configs/<myboard>.h | |
5025 | } else { | |
5026 | Create your own board support subdirectory; | |
5027 | Create your own board include/configs/<myboard>.h file; | |
5028 | } | |
5029 | Edit new board/<myboard> files | |
5030 | Edit new include/configs/<myboard>.h | |
5031 | ||
5032 | while (!accepted) { | |
5033 | while (!running) { | |
5034 | do { | |
5035 | Add / modify source code; | |
5036 | } until (compiles); | |
5037 | Debug; | |
5038 | if (clueless) | |
5039 | email("Hi, I am having problems..."); | |
5040 | } | |
5041 | Send patch file to the U-Boot email list; | |
5042 | if (reasonable critiques) | |
5043 | Incorporate improvements from email list code review; | |
5044 | else | |
5045 | Defend code as written; | |
2729af9d | 5046 | } |
2729af9d WD |
5047 | |
5048 | return 0; | |
5049 | } | |
5050 | ||
5051 | void no_more_time (int sig) | |
5052 | { | |
5053 | hire_a_guru(); | |
5054 | } | |
5055 | ||
c609719b | 5056 | |
2729af9d WD |
5057 | Coding Standards: |
5058 | ----------------- | |
c609719b | 5059 | |
2729af9d | 5060 | All contributions to U-Boot should conform to the Linux kernel |
659208da BS |
5061 | coding style; see the kernel coding style guide at |
5062 | https://www.kernel.org/doc/html/latest/process/coding-style.html, and the | |
5063 | script "scripts/Lindent" in your Linux kernel source directory. | |
2c051651 DZ |
5064 | |
5065 | Source files originating from a different project (for example the | |
5066 | MTD subsystem) are generally exempt from these guidelines and are not | |
b445bbb4 | 5067 | reformatted to ease subsequent migration to newer versions of those |
2c051651 DZ |
5068 | sources. |
5069 | ||
5070 | Please note that U-Boot is implemented in C (and to some small parts in | |
5071 | Assembler); no C++ is used, so please do not use C++ style comments (//) | |
5072 | in your code. | |
c609719b | 5073 | |
2729af9d WD |
5074 | Please also stick to the following formatting rules: |
5075 | - remove any trailing white space | |
7ca9296e | 5076 | - use TAB characters for indentation and vertical alignment, not spaces |
2729af9d | 5077 | - make sure NOT to use DOS '\r\n' line feeds |
7ca9296e | 5078 | - do not add more than 2 consecutive empty lines to source files |
2729af9d | 5079 | - do not add trailing empty lines to source files |
180d3f74 | 5080 | |
2729af9d WD |
5081 | Submissions which do not conform to the standards may be returned |
5082 | with a request to reformat the changes. | |
c609719b WD |
5083 | |
5084 | ||
2729af9d WD |
5085 | Submitting Patches: |
5086 | ------------------- | |
c609719b | 5087 | |
2729af9d WD |
5088 | Since the number of patches for U-Boot is growing, we need to |
5089 | establish some rules. Submissions which do not conform to these rules | |
5090 | may be rejected, even when they contain important and valuable stuff. | |
c609719b | 5091 | |
0d28f34b | 5092 | Please see http://www.denx.de/wiki/U-Boot/Patches for details. |
218ca724 | 5093 | |
0668236b | 5094 | Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; |
1dade18e | 5095 | see https://lists.denx.de/listinfo/u-boot |
0668236b | 5096 | |
2729af9d WD |
5097 | When you send a patch, please include the following information with |
5098 | it: | |
c609719b | 5099 | |
2729af9d WD |
5100 | * For bug fixes: a description of the bug and how your patch fixes |
5101 | this bug. Please try to include a way of demonstrating that the | |
5102 | patch actually fixes something. | |
c609719b | 5103 | |
2729af9d WD |
5104 | * For new features: a description of the feature and your |
5105 | implementation. | |
c609719b | 5106 | |
2729af9d | 5107 | * A CHANGELOG entry as plaintext (separate from the patch) |
c609719b | 5108 | |
7207b366 RD |
5109 | * For major contributions, add a MAINTAINERS file with your |
5110 | information and associated file and directory references. | |
c609719b | 5111 | |
27af930e AA |
5112 | * When you add support for a new board, don't forget to add a |
5113 | maintainer e-mail address to the boards.cfg file, too. | |
c609719b | 5114 | |
2729af9d WD |
5115 | * If your patch adds new configuration options, don't forget to |
5116 | document these in the README file. | |
c609719b | 5117 | |
218ca724 WD |
5118 | * The patch itself. If you are using git (which is *strongly* |
5119 | recommended) you can easily generate the patch using the | |
7ca9296e | 5120 | "git format-patch". If you then use "git send-email" to send it to |
218ca724 WD |
5121 | the U-Boot mailing list, you will avoid most of the common problems |
5122 | with some other mail clients. | |
5123 | ||
5124 | If you cannot use git, use "diff -purN OLD NEW". If your version of | |
5125 | diff does not support these options, then get the latest version of | |
5126 | GNU diff. | |
c609719b | 5127 | |
218ca724 WD |
5128 | The current directory when running this command shall be the parent |
5129 | directory of the U-Boot source tree (i. e. please make sure that | |
5130 | your patch includes sufficient directory information for the | |
5131 | affected files). | |
6dff5529 | 5132 | |
218ca724 WD |
5133 | We prefer patches as plain text. MIME attachments are discouraged, |
5134 | and compressed attachments must not be used. | |
c609719b | 5135 | |
2729af9d WD |
5136 | * If one logical set of modifications affects or creates several |
5137 | files, all these changes shall be submitted in a SINGLE patch file. | |
52f52c14 | 5138 | |
2729af9d WD |
5139 | * Changesets that contain different, unrelated modifications shall be |
5140 | submitted as SEPARATE patches, one patch per changeset. | |
8bde7f77 | 5141 | |
52f52c14 | 5142 | |
2729af9d | 5143 | Notes: |
c609719b | 5144 | |
6de80f21 | 5145 | * Before sending the patch, run the buildman script on your patched |
2729af9d WD |
5146 | source tree and make sure that no errors or warnings are reported |
5147 | for any of the boards. | |
c609719b | 5148 | |
2729af9d WD |
5149 | * Keep your modifications to the necessary minimum: A patch |
5150 | containing several unrelated changes or arbitrary reformats will be | |
5151 | returned with a request to re-formatting / split it. | |
c609719b | 5152 | |
2729af9d WD |
5153 | * If you modify existing code, make sure that your new code does not |
5154 | add to the memory footprint of the code ;-) Small is beautiful! | |
5155 | When adding new features, these should compile conditionally only | |
5156 | (using #ifdef), and the resulting code with the new feature | |
5157 | disabled must not need more memory than the old code without your | |
5158 | modification. | |
90dc6704 | 5159 | |
0668236b WD |
5160 | * Remember that there is a size limit of 100 kB per message on the |
5161 | u-boot mailing list. Bigger patches will be moderated. If they are | |
5162 | reasonable and not too big, they will be acknowledged. But patches | |
5163 | bigger than the size limit should be avoided. |