Hi:
If CPU boot from NAND (at least for AMCC Sequoia board) u-boot
environment is part of u-boot image itself, see extraction from sequia.h
file:
#ifdef CFG_ENV_IS_IN_NAND
/*
* For NAND booting the environment is embedded in the U-Boot image.
Please take
* look at the file board/amcc/sequoia/u-boot-nand.lds for details.
*/
#define CFG_ENV_SIZE CFG_NAND_BLOCK_SIZE
#define CFG_ENV_OFFSET (CFG_NAND_U_BOOT_OFFS + CFG_ENV_SIZE)
#define CFG_ENV_OFFSET_REDUND (CFG_ENV_OFFSET + CFG_ENV_SIZE)
#endif
Such layout supported by u-boot-nand.lds as comment suggests:
/* WARNING - the following is hand-optimized to fit within */
/* the sector layout of our flash chips! XXX FIXME XXX */
cpu/ppc4xx/start.o (.text)
/* Align to next NAND block */
. = ALIGN(0x4000);
common/environment.o (.ppcenv)
/* Keep some space here for redundant env and potential bad env
blocks */
. = ALIGN(0x10000);
The problem is that any time u-boot image is updated, its environment is
lost which is not convenient if the environment differs from default one
significantly.
Can I put environment elsewhere on NAND flash and what is bad in doing
so?
Thanks,
Leonid.
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