I had the same problem you must fix this issue in your mtd configuration.
go to drivers/mtd/nand/nand_base.c Edit the lines below with correct
settings it is related to oobdata. In our nand flash some bytes in spare
area is used to determine whether it is a bad block. it is in my case byte 0
byte 1 and byte 5 shows that my block is bad if they dont contain FF. so you
must read the manual and change the .oobfree area to a correct place

/*

static struct nand_oobinfo nand_oob_64 = {
        .useecc = MTD_NANDECC_AUTOPLACE,
        .eccbytes = 24,
        .eccpos = {
                40, 41, 42, 43, 44, 45, 46, 47,
                48, 49, 50, 51, 52, 53, 54, 55,
                56, 57, 58, 59, 60, 61, 62, 63},
        .oobfree = { {2, 38} }
};
*/

static struct nand_oobinfo nand_oob_64 = {
        .useecc = MTD_NANDECC_AUTOPLACE,
        .eccbytes = 24,
        .eccpos = {
                40, 41, 42, 43, 44, 45, 46, 47,
                48, 49, 50, 51, 52, 53, 54, 55,
                56, 57, 58, 59, 60, 61, 62, 63
        },
        .oobfree = { {6, 34} }
};




On Jan 24, 2008 12:05 PM, Thomas Scariah <thomas.scaria@gdatech.co.in>
wrote:

>  Hi ....
>
> I am using a NAND flash of 2K page size. when I go through mailing list I
> am able to know that some other users also faced the same issue.I'm
> mounting using following command after I have enabled following
> configuration in defconfig.
>
> CONFIG_YAFFS_FS=y
> CONFIG_YAFFS_YAFFS1=y
> CONFIG_YAFFS_9BYTE_TAGS=y
> CONFIG_YAFFS_YAFFS2=y
> CONFIG_YAFFS_AUTO_YAFFS2=y
> CONFIG_YAFFS_DISABLE_LAZY_LOAD=y
> # CONFIG_YAFFS_DISABLE_WIDE_TNODES is not set
> # CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED is not set
> CONFIG_YAFFS_SHORT_NAMES_IN_RAM=y
> The commands I am using for mounting is
>
> flash_eraseall /dev/mtd14
> nandwrite -a -o /dev/mtd14 dummy.yaffs2
> mount -t yaffs2 /dev/mtdblock14 /mnt/nand
>
>  i also tried
> flash_eraseall /dev/mtd14
>  mount -t yaffs2 /dev/mtdblock14 /mnt/nand
>
> But after that if I unmount and remount once more time the files I am
> creating will disappear.At the same time a new file will be creating in
> the folder lost+found,as name objXXXX.the content is still there in the
> nand flash.
>
> I heard that there is some patch available for MTD device to make the
> yaffs2 working.Also I am using another nand of page size 512 bytes, Its
> working fine with yaffs1.
>
> please help me to cure this problem..
>
> Regards
> Thomas Scariah
>
> _______________________________________________
> yaffs mailing list
> yaffs@lists.aleph1.co.uk
> http://lists.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs
>
>


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