Hi Vitaly Wool

    Thanks a million for your help , I am lijie from chongqing City China .
    According to your advice I have adjusted my NAND driver to make its OOB layout match YAFFS2 OOB layout. my nandflash is : "NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit) "
the following oob placements defined in /driver/mtd/nand/nand_base.c
--------------------------------------------------------------------------
/* Define default oob placement schemes for large and small page devices */
static struct nand_oobinfo nand_oob_8 = {
        .useecc = MTD_NANDECC_AUTOPLACE,
        .eccbytes = 3,
        .eccpos = {0, 1, 2},
        .oobfree = { {3, 2}, {6, 2} }
};

static struct nand_oobinfo nand_oob_16 = {
        .useecc = MTD_NANDECC_AUTOPLACE,
        .eccbytes = 6,
        .eccpos = {0, 1, 2, 3, 6, 7},
        .oobfree = { {8, 8} }
};

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} }
};
--------------------------------------------------------------------------

While oob placements definition in yaffs_mtdif.c
==========================================
static struct nand_oobinfo yaffs_oobinfo = {
.useecc = 1,
.eccbytes = 6,
.eccpos = {8, 9, 10, 13, 14, 15}
};

==========================================

then i change the struct " nand_oobinfo nand_oob_16" into
static struct nand_oobinfo nand_oob_16 = {
        .useecc = MTD_NANDECC_AUTOPLACE, //equal to " 2 "
        .eccbytes = 6,
        .eccpos = {0, 1, 2, 3, 6, 7},
};

but the errors is the same as before. Anyclues what
could be wrong ..
Any help will be highly appreciated.

regards

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Today's Topics:

1. Re: yaffs compiling errors 'yaffs_internal_read_super' and

yaffs2 write errors (Vitaly Wool)

----------------------------------------------------------------------

Message: 1

Date: Wed, 13 Dec 2006 12:31:02 +0300

From: "Vitaly Wool" <vitalywool@gmail.com >

Subject: Re: [Yaffs] yaffs compiling errors

'yaffs_internal_read_super' and yaffs2 write errors

To: howhowwork <howhowwork@163.com >

Cc: "yaffs@lists.aleph1.co.uk" <yaffs@lists.aleph1.co.uk >

Message-ID:

<acd2a5930612130131n13c04182k503c4c4c08fffce1@mail.gmail.com >

Content-Type: text/plain; charset="iso-8859-1"

Hi,

On 12/13/06, howhowwork <howhowwork@163.com > wrote:

> Hello,

first, can you please introduce yourself? 'howhowwork' is not too a

descriptive name. I'd say even more, my spam filter tried to block your

message :)

> I downloaded the newest yaffs code from "

> http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs" and place it to

> linux kernel 2.6.11. I select yafss and mtd support from muneconfig. After

> make, I got the error messages

> at the end:

yaffs is deprecated, use yaffs2 in yaffs1 mode.

> 4. then there are erros when copying data to mnt's directory

> the questions :

> when copy less 120k data , no errors,and the data is correct after i

> reboot

> however , copying more 100k data ,there are the following errors:

> ===========================================

> ** > >mtd ecc error unfixed on chunk 113984:0

> ** > >mtd ecc error unfixed on chunk 113984:1

> ** > >Block 3562 marked for retirement

> ** > > yaffs chunk 114016 was not erased

> ** > > Erasure failed 3563

> ** > > Block 3563 retired

There's apparently a problem with your NAND driver. For kernel versions

earlier than 2.6.18 you have to manually adjust (hack) your NAND driver to

make its OOB layout match SmartMedia OOB layout.

Vitaly

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