IH_OS_U_BOOT u_boot_hush_start
-Directory Hierarchy:
-====================
-
-/arch Architecture-specific files
- /arc Files generic to ARC architecture
- /arm Files generic to ARM architecture
- /m68k Files generic to m68k architecture
- /microblaze Files generic to microblaze architecture
- /mips Files generic to MIPS architecture
- /nios2 Files generic to Altera NIOS2 architecture
- /powerpc Files generic to PowerPC architecture
- /riscv Files generic to RISC-V architecture
- /sandbox Files generic to HW-independent "sandbox"
- /sh Files generic to SH architecture
- /x86 Files generic to x86 architecture
- /xtensa Files generic to Xtensa architecture
-/api Machine/arch-independent API for external apps
-/board Board-dependent files
-/boot Support for images and booting
-/cmd U-Boot commands functions
-/common Misc architecture-independent functions
-/configs Board default configuration files
-/disk Code for disk drive partition handling
-/doc Documentation (a mix of ReST and READMEs)
-/drivers Device drivers
-/dts Makefile for building internal U-Boot fdt.
-/env Environment support
-/examples Example code for standalone applications, etc.
-/fs Filesystem code (cramfs, ext2, jffs2, etc.)
-/include Header Files
-/lib Library routines generic to all architectures
-/Licenses Various license files
-/net Networking code
-/post Power On Self Test
-/scripts Various build scripts and Makefiles
-/test Various unit test files
-/tools Tools to build and sign FIT images, etc.
-
Software Configuration:
=======================
same as CFG_SYS_DDR_SDRAM_BASE for all Power SoCs. But
it could be different for ARM SoCs.
-- MIPS CPU options:
- CONFIG_XWAY_SWAP_BYTES
-
- Enable compilation of tools/xway-swap-bytes needed for Lantiq
- XWAY SoCs for booting from NOR flash. The U-Boot image needs to
- be swapped if a flash programmer is used.
-
- ARM options:
CFG_SYS_EXCEPTION_VECTORS_HIGH
different from COUNTER_FREQUENCY, and can only be determined
at run time.
-- Tegra SoC options:
- CONFIG_TEGRA_SUPPORT_NON_SECURE
-
- Support executing U-Boot in non-secure (NS) mode. Certain
- impossible actions will be skipped if the CPU is in NS mode,
- such as ARM architectural timer initialization.
-
- Linux Kernel Interface:
CONFIG_OF_LIBFDT
Support for a lightweight UBI (fastmap) scanner and
loader
- CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
- CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
- CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
- CFG_SYS_NAND_ECCPOS, CFG_SYS_NAND_ECCSIZE,
- CFG_SYS_NAND_ECCBYTES
+ CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_SIZE,
+ CONFIG_SYS_NAND_OOBSIZE, CONFIG_SYS_NAND_BLOCK_SIZE,
+ CONFIG_SYS_NAND_BAD_BLOCK_POS, CFG_SYS_NAND_ECCPOS,
+ CFG_SYS_NAND_ECCSIZE, CFG_SYS_NAND_ECCBYTES
Defines the size and behavior of the NAND that SPL uses
to read U-Boot
Configuration Settings:
-----------------------
-- MEM_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit.
- Optionally it can be defined to support 64-bit memory commands.
-
- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
undefine this when you're short of memory.
- CONFIG_SYS_MALLOC_LEN:
Size of DRAM reserved for malloc() use.
-- CONFIG_SYS_MALLOC_F_LEN
- Size of the malloc() pool for use before relocation. If
- this is defined, then a very simple malloc() implementation
- will become available before relocation. The address is just
- below the global data, and the stack is moved down to make
- space.
-
- This feature allocates regions with increasing addresses
- within the region. calloc() is supported, but realloc()
- is not available. free() is supported but does nothing.
- The memory will be freed (or in fact just forgotten) when
- U-Boot relocates itself.
-
-- CONFIG_SYS_MALLOC_SIMPLE
- Provides a simple and small malloc() and calloc() for those
- boards which do not use the full malloc in SPL (which is
- enabled with CONFIG_SYS_SPL_MALLOC).
-
- CFG_SYS_BOOTMAPSZ:
Maximum size of memory mapped by the startup code of
the Linux kernel; all data that must be processed by
globally (CONFIG_CMD_MEMORY).
- CONFIG_SPL_BUILD
- Set when the currently-running compilation is for an artifact
- that will end up in the SPL (as opposed to the TPL or U-Boot
- proper). Code that needs stage-specific behavior should check
- this.
+ Set when the currently running compilation is for an artifact
+ that will end up in one of the 'xPL' builds, i.e. SPL, TPL or
+ VPL. Code that needs phase-specific behaviour can check this,
+ or (where possible) use spl_phase() instead.
+
+ Note that CONFIG_SPL_BUILD *is* always defined when either
+ of CONFIG_TPL_BUILD / CONFIG_VPL_BUILD is defined. This can be
+ counter-intuitive and should perhaps be changed.
- CONFIG_TPL_BUILD
- Set when the currently-running compilation is for an artifact
- that will end up in the TPL (as opposed to the SPL or U-Boot
- proper). Code that needs stage-specific behavior should check
- this.
+ Set when the currently running compilation is for an artifact
+ that will end up in the TPL build (as opposed to SPL, VPL or
+ U-Boot proper). Code that needs phase-specific behaviour can
+ check this, or (where possible) use spl_phase() instead.
+
+- CONFIG_VPL_BUILD
+ Set when the currently running compilation is for an artifact
+ that will end up in the VPL build (as opposed to the SPL, TPL
+ or U-Boot proper). Code that needs phase-specific behaviour can
+ check this, or (where possible) use spl_phase() instead.
- CONFIG_ARCH_MAP_SYSMEM
Generally U-Boot (and in particular the md command) uses
base - print or set address offset
printenv- print environment variables
pwm - control pwm channels
+seama - load SEAMA NAND image
setenv - set environment variables
saveenv - save environment variables to persistent storage
protect - enable or disable FLASH write protection
[q, b, e, ?] ## Application terminated, rc = 0x0
-Minicom warning:
-================
-
-Over time, many people have reported problems when trying to use the
-"minicom" terminal emulation program for serial download. I (wd)
-consider minicom to be broken, and recommend not to use it. Under
-Unix, I recommend to use C-Kermit for general purpose use (and
-especially for kermit binary protocol download ("loadb" command), and
-use "cu" for S-Record download ("loads" command). See
-https://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
-for help with kermit.
-
-
-Nevertheless, if you absolutely want to use it try adding this
-configuration to your "File transfer protocols" section:
-
- Name Program Name U/D FullScr IO-Red. Multi
- X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
- Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
-
-
Implementation Internals:
=========================
new address in RAM.
-U-Boot Porting Guide:
-----------------------
-
-[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
-list, October 2002]
-
-
-int main(int argc, char *argv[])
-{
- sighandler_t no_more_time;
-
- signal(SIGALRM, no_more_time);
- alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
-
- if (available_money > available_manpower) {
- Pay consultant to port U-Boot;
- return 0;
- }
-
- Download latest U-Boot source;
-
- Subscribe to u-boot mailing list;
-
- if (clueless)
- email("Hi, I am new to U-Boot, how do I get started?");
-
- while (learning) {
- Read the README file in the top level directory;
- Read https://www.denx.de/wiki/bin/view/DULG/Manual;
- Read applicable doc/README.*;
- Read the source, Luke;
- /* find . -name "*.[chS]" | xargs grep -i <keyword> */
- }
-
- if (available_money > toLocalCurrency ($2500))
- Buy a BDI3000;
- else
- Add a lot of aggravation and time;
-
- if (a similar board exists) { /* hopefully... */
- cp -a board/<similar> board/<myboard>
- cp include/configs/<similar>.h include/configs/<myboard>.h
- } else {
- Create your own board support subdirectory;
- Create your own board include/configs/<myboard>.h file;
- }
- Edit new board/<myboard> files
- Edit new include/configs/<myboard>.h
-
- while (!accepted) {
- while (!running) {
- do {
- Add / modify source code;
- } until (compiles);
- Debug;
- if (clueless)
- email("Hi, I am having problems...");
- }
- Send patch file to the U-Boot email list;
- if (reasonable critiques)
- Incorporate improvements from email list code review;
- else
- Defend code as written;
- }
-
- return 0;
-}
-
-void no_more_time (int sig)
-{
- hire_a_guru();
-}
-
-
Contributing
============
The U-Boot projects depends on contributions from the user community.
If you want to participate, please, have a look at the 'General'
-section of https://u-boot.readthedocs.io/en/latest/develop/index.html
+section of https://docs.u-boot.org/en/latest/develop/index.html
where we describe coding standards and the patch submission process.
projects / thirdparty / u-boot.git / blobdiff