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flash: Add optional verify-after-write feature

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Sometimes it might make sense to verify the written data to NOR flash.
This patch adds this feature. To enable this verify-after-write, you
need to define CONFIG_FLASH_VERIFY in your board config header.

Please note that this option is useless in nearly all cases,
since such flash programming errors usually are detected earlier
while unprotecting/erasing/programming. Please only enable
this option if you really know what you are doing.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese
2013-04-04 15:53:14 +02:00
parent d10f68ae47
commit 352ef3f1b6
2 changed files with 20 additions and 0 deletions
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11
common/flash.c
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@@ -149,6 +149,9 @@ flash_write (char *src, ulong addr, ulong cnt)
flash_info_t *info_first = addr2info (addr);
flash_info_t *info_last = addr2info (end );
flash_info_t *info;
__maybe_unused char *src_orig = src;
__maybe_unused char *addr_orig = (char *)addr;
__maybe_unused ulong cnt_orig = cnt;
if (cnt == 0) {
return (ERR_OK);
@@ -185,6 +188,14 @@ flash_write (char *src, ulong addr, ulong cnt)
addr += len;
src += len;
}
#if defined(CONFIG_FLASH_VERIFY)
if (memcmp(src_orig, addr_orig, cnt_orig)) {
printf("\nVerify failed!\n");
return ERR_PROG_ERROR;
}
#endif /* CONFIG_SYS_FLASH_VERIFY_AFTER_WRITE */
return (ERR_OK);
#endif /* CONFIG_SPD823TS */
}