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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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9
README
View file

@ -3248,6 +3248,15 @@ Configuration Settings:
digits and dots. Recommended value: 45 (9..1) for 80
column displays, 15 (3..1) for 40 column displays.
- CONFIG_FLASH_VERIFY
If defined, the content of the flash (destination) is compared
against the source after the write operation. An error message
will be printed when the contents are not identical.
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.
- CONFIG_SYS_RX_ETH_BUFFER:
Defines the number of Ethernet receive buffers. On some
Ethernet controllers it is recommended to set this value

11
common/flash.c
View file

@ -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 */
}