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mtd: add support for bad blocks in NAND flash

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NAND flash is very likely to contain bad blocks.

Currently, mtd and therefore sysupgrade fails when it encounters a single bad block, potentially leaving an unbootable system.

This patch allows the mtd utility to skip bad blocks in NAND flash and complete sysupgrade successfully.

Patch by: Matthew Redfearn <matt.redfearn@nxp.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 40021
This commit is contained in:
Felix Fietkau
2014-03-26 10:50:09 +00:00
parent 0555ebf66d
commit 608f4fe3b0
3 changed files with 56 additions and 5 deletions
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9
package/system/mtd/src/jffs2.c
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@@ -59,6 +59,15 @@ static void pad(int size)
}
ofs = ofs % erasesize;
if (ofs == 0) {
while (mtd_block_is_bad(outfd, mtdofs) && (mtdofs < mtdsize)) {
if (!quiet)
fprintf(stderr, "\nSkipping bad block at 0x%08x ", mtdofs);
mtdofs += erasesize;
/* Move the file pointer along over the bad block. */
lseek(outfd, erasesize, SEEK_CUR);
}
mtd_erase_block(outfd, mtdofs);
write(outfd, buf, erasesize);
mtdofs += erasesize;