2 # For a description of the syntax of this configuration file,
3 # see the file Documentation/kbuild/kconfig-language.txt in the
4 # Linux kernel source tree.
6 mainmenu "U-Boot $UBOOTVERSION Configuration"
10 option env="UBOOTVERSION"
12 # Allow defaults in arch-specific code to override any given here
20 This option cannot be enabled. It is used as dependency
21 for broken and incomplete features.
24 string "Local version - append to U-Boot release"
26 Append an extra string to the end of your U-Boot version.
27 This will show up in your boot log, for example.
28 The string you set here will be appended after the contents of
29 any files with a filename matching localversion* in your
30 object and source tree, in that order. Your total string can
31 be a maximum of 64 characters.
33 config LOCALVERSION_AUTO
34 bool "Automatically append version information to the version string"
37 This will try to automatically determine if the current tree is a
38 release tree by looking for Git tags that belong to the current
41 A string of the format -gxxxxxxxx will be added to the localversion
42 if a Git-based tree is found. The string generated by this will be
43 appended after any matching localversion* files, and after the value
44 set in CONFIG_LOCALVERSION.
46 (The actual string used here is the first eight characters produced
47 by running the command:
49 $ git rev-parse --verify HEAD
51 which is done within the script "scripts/setlocalversion".)
53 config CC_OPTIMIZE_FOR_SIZE
54 bool "Optimize for size"
57 Enabling this option will pass "-Os" instead of "-O2" to gcc
58 resulting in a smaller U-Boot image.
60 This option is enabled by default for U-Boot.
63 bool "Enable code coverage analysis"
66 Enabling this option will pass "--coverage" to gcc to compile
67 and link code instrumented for coverage analysis.
69 config DISTRO_DEFAULTS
70 bool "Select defaults suitable for booting general purpose Linux distributions"
72 select CMDLINE_EDITING
73 select CMD_BOOTI if ARM64
74 select CMD_BOOTZ if ARM && !ARM64
75 select CMD_DHCP if CMD_NET
81 select CMD_PART if PARTITIONS
82 select CMD_PING if CMD_NET
84 select ENV_VARS_UBOOT_CONFIG
86 select SUPPORT_RAW_INITRD
92 Select this to enable various options and commands which are suitable
93 for building u-boot for booting general purpose Linux distributions.
95 config ENV_VARS_UBOOT_CONFIG
96 bool "Add arch, board, vendor and soc variables to default environment"
98 Define this in order to add variables describing the
99 U-Boot build configuration to the default environment.
100 These will be named arch, cpu, board, vendor, and soc.
101 Enabling this option will cause the following to be defined:
109 int "Number of DRAM banks"
112 This defines the number of DRAM banks.
114 config SYS_BOOT_GET_CMDLINE
115 bool "Enable kernel command line setup"
117 Enables allocating and saving kernel cmdline in space between
118 "bootm_low" and "bootm_low" + BOOTMAPSZ.
120 config SYS_BOOT_GET_KBD
121 bool "Enable kernel board information setup"
123 Enables allocating and saving a kernel copy of the bd_info in
124 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
127 bool "Enable malloc() pool before relocation"
130 Before relocation, memory is very limited on many platforms. Still,
131 we can provide a small malloc() pool if needed. Driver model in
132 particular needs this to operate, so that it can allocate the
133 initial serial device and any others that are needed.
135 config SYS_MALLOC_F_LEN
136 hex "Size of malloc() pool before relocation"
137 depends on SYS_MALLOC_F
138 default 0x1000 if AM33XX
141 Before relocation, memory is very limited on many platforms. Still,
142 we can provide a small malloc() pool if needed. Driver model in
143 particular needs this to operate, so that it can allocate the
144 initial serial device and any others that are needed.
146 config SYS_MALLOC_LEN
147 hex "Define memory for Dynamic allocation"
148 depends on ARCH_ZYNQ || ARCH_VERSAL
150 This defines memory to be allocated for Dynamic allocation
151 TODO: Use for other architectures
153 config SPL_SYS_MALLOC_F_LEN
154 hex "Size of malloc() pool in SPL before relocation"
155 depends on SYS_MALLOC_F
156 default SYS_MALLOC_F_LEN
158 Before relocation, memory is very limited on many platforms. Still,
159 we can provide a small malloc() pool if needed. Driver model in
160 particular needs this to operate, so that it can allocate the
161 initial serial device and any others that are needed.
163 config TPL_SYS_MALLOC_F_LEN
164 hex "Size of malloc() pool in TPL before relocation"
165 depends on SYS_MALLOC_F
166 default SYS_MALLOC_F_LEN
168 Before relocation, memory is very limited on many platforms. Still,
169 we can provide a small malloc() pool if needed. Driver model in
170 particular needs this to operate, so that it can allocate the
171 initial serial device and any others that are needed.
174 bool "Configure standard U-Boot features (expert users)"
177 This option allows certain base U-Boot options and settings
178 to be disabled or tweaked. This is for specialized
179 environments which can tolerate a "non-standard" U-Boot.
180 Use this only if you really know what you are doing.
183 config SYS_MALLOC_CLEAR_ON_INIT
184 bool "Init with zeros the memory reserved for malloc (slow)"
187 This setting is enabled by default. The reserved malloc
188 memory is initialized with zeros, so first malloc calls
189 will return the pointer to the zeroed memory. But this
192 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
193 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
194 Then the boot time can be significantly reduced.
196 When disabling this, please check if malloc calls, maybe
197 should be replaced by calloc - if one expects zeroed memory.
200 bool "Enable debug information for tools"
202 Enable generation of debug information for tools such as mkimage.
203 This can be used for debugging purposes. With debug information
204 it is possible to set breakpoints on particular lines, single-step
205 debug through the source code, etc.
210 bool "64bit physical address support"
212 Say Y here to support 64bit physical memory address.
213 This can be used not only for 64bit SoCs, but also for
214 large physical address extention on 32bit SoCs.
217 bool "Build U-Boot as BIOS replacement"
220 This option allows to build a ROM version of U-Boot.
221 The build process generally requires several binary blobs
222 which are not shipped in the U-Boot source tree.
223 Please, see doc/README.x86 for details.
225 endmenu # General setup
229 config ANDROID_BOOT_IMAGE
230 bool "Enable support for Android Boot Images"
231 default y if FASTBOOT
233 This enables support for booting images which use the Android
237 bool "Support Flattened Image Tree"
241 This option allows you to boot the new uImage structure,
242 Flattened Image Tree. FIT is formally a FDT, which can include
243 images of various types (kernel, FDT blob, ramdisk, etc.)
244 in a single blob. To boot this new uImage structure,
245 pass the address of the blob to the "bootm" command.
246 FIT is very flexible, supporting compression, multiple images,
247 multiple configurations, verification through hashing and also
248 verified boot (secure boot using RSA).
252 config FIT_ENABLE_SHA256_SUPPORT
253 bool "Support SHA256 checksum of FIT image contents"
257 Enable this to support SHA256 checksum of FIT image contents. A
258 SHA256 checksum is a 256-bit (32-byte) hash value used to check that
259 the image contents have not been corrupted. SHA256 is recommended
260 for use in secure applications since (as at 2016) there is no known
261 feasible attack that could produce a 'collision' with differing
262 input data. Use this for the highest security. Note that only the
263 SHA256 variant is supported: SHA512 and others are not currently
267 bool "Enable signature verification of FIT uImages"
272 This option enables signature verification of FIT uImages,
273 using a hash signed and verified using RSA. If
274 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
275 hashing is available using hardware, then the RSA library will use
276 it. See doc/uImage.FIT/signature.txt for more details.
278 WARNING: When relying on signed FIT images with a required signature
279 check the legacy image format is disabled by default, so that
280 unsigned images cannot be loaded. If a board needs the legacy image
281 format support in this case, enable it using
282 CONFIG_IMAGE_FORMAT_LEGACY.
284 config FIT_SIGNATURE_MAX_SIZE
285 hex "Max size of signed FIT structures"
286 depends on FIT_SIGNATURE
289 This option sets a max size in bytes for verified FIT uImages.
290 A sane value of 256MB protects corrupted DTB structures from overlapping
291 device memory. Assure this size does not extend past expected storage
294 config FIT_ENABLE_RSASSA_PSS_SUPPORT
295 bool "Support rsassa-pss signature scheme of FIT image contents"
296 depends on FIT_SIGNATURE
299 Enable this to support the pss padding algorithm as described
300 in the rfc8017 (https://tools.ietf.org/html/rfc8017).
303 bool "Show verbose messages when FIT images fail"
305 Generally a system will have valid FIT images so debug messages
306 are a waste of code space. If you are debugging your images then
307 you can enable this option to get more verbose information about
310 config FIT_BEST_MATCH
311 bool "Select the best match for the kernel device tree"
313 When no configuration is explicitly selected, default to the
314 one whose fdt's compatibility field best matches that of
315 U-Boot itself. A match is considered "best" if it matches the
316 most specific compatibility entry of U-Boot's fdt's root node.
317 The order of entries in the configuration's fdt is ignored.
319 config FIT_IMAGE_POST_PROCESS
320 bool "Enable post-processing of FIT artifacts after loading by U-Boot"
321 depends on TI_SECURE_DEVICE
323 Allows doing any sort of manipulation to blobs after they got extracted
324 from FIT images like stripping off headers or modifying the size of the
325 blob, verification, authentication, decryption etc. in a platform or
326 board specific way. In order to use this feature a platform or board-
327 specific implementation of board_fit_image_post_process() must be
328 provided. Also, anything done during this post-processing step would
329 need to be comprehended in how the images were prepared before being
330 injected into the FIT creation (i.e. the blobs would have been pre-
331 processed before being added to the FIT image).
336 bool "Support Flattened Image Tree within SPL"
341 bool "Support FIT printing within SPL"
344 Support printing the content of the fitImage in a verbose manner in SPL.
346 config SPL_FIT_SIGNATURE
347 bool "Enable signature verification of FIT firmware within SPL"
353 bool "Enable SPL loading U-Boot as a FIT"
356 Normally with the SPL framework a legacy image is generated as part
357 of the build. This contains U-Boot along with information as to
358 where it should be loaded. This option instead enables generation
359 of a FIT (Flat Image Tree) which provides more flexibility. In
360 particular it can handle selecting from multiple device tree
361 and passing the correct one to U-Boot.
363 config SPL_LOAD_FIT_FULL
364 bool "Enable SPL loading U-Boot as a FIT"
367 Normally with the SPL framework a legacy image is generated as part
368 of the build. This contains U-Boot along with information as to
369 where it should be loaded. This option instead enables generation
370 of a FIT (Flat Image Tree) which provides more flexibility. In
371 particular it can handle selecting from multiple device tree
372 and passing the correct one to U-Boot.
374 config SPL_FIT_IMAGE_POST_PROCESS
375 bool "Enable post-processing of FIT artifacts after loading by the SPL"
376 depends on SPL_LOAD_FIT
378 Allows doing any sort of manipulation to blobs after they got extracted
379 from the U-Boot FIT image like stripping off headers or modifying the
380 size of the blob, verification, authentication, decryption etc. in a
381 platform or board specific way. In order to use this feature a platform
382 or board-specific implementation of board_fit_image_post_process() must
383 be provided. Also, anything done during this post-processing step would
384 need to be comprehended in how the images were prepared before being
385 injected into the FIT creation (i.e. the blobs would have been pre-
386 processed before being added to the FIT image).
388 config SPL_FIT_SOURCE
389 string ".its source file for U-Boot FIT image"
392 Specifies a (platform specific) FIT source file to generate the
393 U-Boot FIT image. This could specify further image to load and/or
396 config SPL_FIT_GENERATOR
397 string ".its file generator script for U-Boot FIT image"
399 default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
401 Specifies a (platform specific) script file to generate the FIT
402 source file used to build the U-Boot FIT image file. This gets
403 passed a list of supported device tree file stub names to
404 include in the generated image.
410 config IMAGE_FORMAT_LEGACY
411 bool "Enable support for the legacy image format"
412 default y if !FIT_SIGNATURE
414 This option enables the legacy image format. It is enabled by
415 default for backward compatibility, unless FIT_SIGNATURE is
416 set where it is disabled so that unsigned images cannot be
417 loaded. If a board needs the legacy image format support in this
418 case, enable it here.
420 config OF_BOARD_SETUP
421 bool "Set up board-specific details in device tree before boot"
424 This causes U-Boot to call ft_board_setup() before booting into
425 the Operating System. This function can set up various
426 board-specific information in the device tree for use by the OS.
427 The device tree is then passed to the OS.
429 config OF_SYSTEM_SETUP
430 bool "Set up system-specific details in device tree before boot"
433 This causes U-Boot to call ft_system_setup() before booting into
434 the Operating System. This function can set up various
435 system-specific information in the device tree for use by the OS.
436 The device tree is then passed to the OS.
438 config OF_STDOUT_VIA_ALIAS
439 bool "Update the device-tree stdout alias from U-Boot"
442 This uses U-Boot's serial alias from the aliases node to update
443 the device tree passed to the OS. The "linux,stdout-path" property
444 in the chosen node is set to point to the correct serial node.
445 This option currently references CONFIG_CONS_INDEX, which is
446 incorrect when used with device tree as this option does not
447 exist / should not be used.
449 config SYS_EXTRA_OPTIONS
450 string "Extra Options (DEPRECATED)"
452 The old configuration infrastructure (= mkconfig + boards.cfg)
453 provided the extra options field. If you have something like
454 "HAS_BAR,BAZ=64", the optional options
456 #define CONFIG_BAZ 64
457 will be defined in include/config.h.
458 This option was prepared for the smooth migration from the old
459 configuration to Kconfig. Since this option will be removed sometime,
460 new boards should not use this option.
463 depends on !NIOS2 && !XTENSA
465 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
466 default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
467 default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
468 default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
471 The address in memory that U-Boot will be running from, initially.
476 depends on ARC || ARCH_SUNXI
477 int "CPU clock frequency"
479 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
481 config ARCH_FIXUP_FDT_MEMORY
482 bool "Enable arch_fixup_memory_banks() call"
485 Enable FDT memory map syncup before OS boot. This feature can be
486 used for booting OS with different memory setup where the part of
487 the memory location should be used for different purpose.
489 endmenu # Boot images
493 source "common/Kconfig"
497 source "disk/Kconfig"
505 source "drivers/Kconfig"
511 source "test/Kconfig"