From: HASAN HÜSEYIN YILMAZ

To: Thomas Scariah

Cc: yaffs@lists.aleph1.co.uk

Sent: Thursday, January 24, 2008 5:22 PM

Subject: Re: [Yaffs] yaffs2 not retaining file after remounting....

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

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Hasan Hüseyin Yılmaz