On Tuesday 25 September 2007 09:42,
thisway.diy@163.com wrote:
> My kernel is linux 2.6.22.6,
> and yaffs_mtdif1.c's version is : "$Id:
> yaffs_mtdif1.c,v 1.2 2007/07/23 19:14:04 imcd Exp $";
>
> My nand flash has many bad blocks, but the yaffs can't
> recognise them: there isn't any "block %d is bad" information,
> and the yaffs partition can be mounted, but can't be used(it
> is the root filesystem, can't boot).
>
> When I use linux 2.6.13, and the code of yaffs2 is the
> same, and it can boot on the nand flash, and print more
> information of bad block , such as:
> block 3 is bad
> block 100 is bad
>
> In the function nandmtd1_ReadChunkWithTagsFromNAND,
> the 'etags->blockBad' won't be set if 'retval =
> mtd->read_oob(mtd, addr, &ops)' is 0, so it can't recognise
> any bad block, isn't it ?
You're right mtd->read_oob does not return an error when reading
a bad-block. Thanks for pointing this out. This may well be
the source of the issue reported yesterday by Jonathan.
This patch adds a direct call to mtd's bad-block test function
during the initial scan, where Yaffs learns about the block state.
Unfortunately the fix can slow down the scan, but I don't see any
better solution without a functional tweak to MTD.
-imcd
diff -u -I ''\''$Id'\''' -I ''\''$Revision'\''' -u -a -r1.2 yaffs_mtdif1.c
--- yaffs_mtdif1.c 23 Jul 2007 19:14:04 -0000 1.2
+++ yaffs_mtdif1.c 25 Sep 2007 16:05:45 -0000
@@ -327,6 +327,7 @@
{
struct mtd_info * mtd = dev->genericDevice;
int chunkNo = blockNo * dev->nChunksPerBlock;
+ loff_t addr = (loff_t)chunkNo * dev->nDataBytesPerChunk;
yaffs_ExtendedTags etags;
int state = YAFFS_BLOCK_STATE_DEAD;
int seqnum = 0;
@@ -340,6 +341,7 @@
}
retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
+ etags.blockBad = (mtd->block_isbad)(mtd, addr);
if (etags.blockBad) {
yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
"block %d is marked bad", blockNo);
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