* Provide extended interface to Linux boot loader
* S-Record download
* network boot
- * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
+ * ATA disk / SCSI ... boot
- create ARMBoot project (http://sourceforge.net/projects/armboot)
- add other CPU families (starting with ARM)
- create U-Boot project (http://sourceforge.net/projects/u-boot)
- preloader_console_init() can be called here in extremis
- should set up SDRAM, and anything needed to make the UART work
- these is no need to clear BSS, it will be done by crt0.S
+ - for specific scenarios on certain architectures an early BSS *can*
+ be made available (via CONFIG_SPL_EARLY_BSS by moving the clearing
+ of BSS prior to entering board_init_f()) but doing so is discouraged.
+ Instead it is strongly recommended to architect any code changes
+ or additions such to not depend on the availability of BSS during
+ board_init_f() as indicated in other sections of this README to
+ maintain compatibility and consistency across the entire code base.
- must return normally from this function (don't call board_init_r()
directly)
- CONFIG_SYS_SRIOn_MEM_VIRT:
Virtual Address of SRIO port 'n' memory region
-- CONFIG_SYS_SRIOn_MEM_PHYS:
+- CONFIG_SYS_SRIOn_MEM_PHYxS:
Physical Address of SRIO port 'n' memory region
- CONFIG_SYS_SRIOn_MEM_SIZE:
instruction cache) is still performed.
- CONFIG_SPL_BUILD
- Modifies the behaviour of start.S when compiling a loader
- that is executed before the actual U-Boot. E.g. when
- compiling a NAND SPL.
+ 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.
- CONFIG_TPL_BUILD
- Modifies the behaviour of start.S when compiling a loader
- that is executed after the SPL and before the actual U-Boot.
- It is loaded by the SPL.
+ 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.
- CONFIG_SYS_MPC85XX_NO_RESETVEC
Only for 85xx systems. If this variable is specified, the section
If you have modified U-Boot sources (for instance added a new board
or support for new devices, a new CPU, etc.) you are expected to
provide feedback to the other developers. The feedback normally takes
-the form of a "patch", i. e. a context diff against a certain (latest
+the form of a "patch", i.e. a context diff against a certain (latest
official or latest in the git repository) version of U-Boot sources.
But before you submit such a patch, please verify that your modifi-