what cause :**>> yaffs chunk 38598 was not erased

[liu.yaojin at zte.com.cn]

hi charles:

i use ecc soft on mtd ,and not select yaffs's own ecc:

* yaffs2 file system support
-*- 512 byte/ page device
[] use older-style...
[] let yaffs do its ecc
-*- 2048 byte...
[*] autoselect yaffs2 format
[] disable lazy..
[] turn off wide tnodes
[] force chunk erase check
[*] cache short name in RAM

this morning i uncheck "[] turn off wide tnodes "and"[] force chunk erase 
check"，but it appears again.
BTW, i write the image through uboot(BECAUSE HAVE NOT NETWORK...).and make 
some change on mkyaffsimage:

static int write_chunk(__u8 *data, __u32 objId, __u32 chunkId, __u32 
nBytes)
{
#ifdef OLD_WRITE_METHOD
        yaffs_Tags t;
        yaffs_Spare s;

        error = write(outFile,data,512);
        if(error < 0) return error;

        memset(&t,0xff,sizeof (yaffs_Tags));
        memset(&s,0xff,sizeof (yaffs_Spare));
 
        t.chunkId = chunkId;
        t.serialNumber = 0;
        t.byteCountLSB = nBytes;
        t.objectId = objId;

    if (convert_endian)
    {
        little_to_big_endian(&t);
    }
 
        yaffs_CalcTagsECC(&t);
        yaffs_LoadTagsIntoSpare(&s,&t);
        yaffs_CalcECC(data,&s);
 
        nPages++;
 
        return write(outFile,&s,sizeof(yaffs_Spare));
#else
        yaffs_PackedTags1 pt1;  //new yaffs's tag，not yaffs_Spare
        yaffs_ExtendedTags etags;
        __u8 oobdata[16];
        //
        error = write(outFile,data,512);
        if(error < 0) return error;

        //memset(&t,0xff,sizeof (yaffs_Tags));
        //memset(&s,0xff,sizeof (yaffs_Spare));
        //set tag
        etags.chunkId = chunkId;
        etags.serialNumber = 0;
        etags.byteCount = nBytes;
        etags.objectId = objId;
        etags.chunkDeleted = 0; // let pt1->chunkDetected=0
 
        //yaffs_ExtendedTags changeto yaffs_PackedTags1
        yaffs_PackTags1(&pt1,&etags);
        //calc ecc
        yaffs_CalcTagsECC((yaffs_Tags*)&pt1);
        ((__u8*)&pt1)[8]  = 0xff;
        memset(oobdata,0xff,16);
        //place 8 byte ecc to oob[8]-[15]
        memcpy(oobdata+8,&pt1,8); 
 
        nPages++;
 
        return write(outFile,oobdata,16);
#endif
 
}
----------
in uboot i write full page data(512 data+16 oob) with the image to the 
flash.

Is there some problem?
thanks.

=============================================end 
=================================




Charles Manning <manningc2 at actrix.gen.nz> 
发件人:  linux-mtd-bounces at lists.infradead.org
2009-07-30 06:30

收件人
linux-mtd at lists.infradead.org
抄送
liu.yaojin at zte.com.cn
主题
Re: what cause :**>> yaffs chunk 38598 was not erased






On Wednesday 29 July 2009 21:30:50 liu.yaojin at zte.com.cn wrote:
> hi guys:
>
> i use lastest yaffs filesystem,kernel is 2.6.24.
> my nand flash controller is a little slow.and when i copy(or ls)
> files(more than 1MB?),the console appears:
>
> **>> yaffs chunk 38598 was not erased
> **>> yaffs write required 2 attempts
> page 38598 in gc has no object: 0 0 0
>
> and etc...
> so why this happens continually ?
>

You're probably better off asking yaffs questions on the yaffs list: 
http://stoneboat.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs

This is happening because your spare area management is not correct and 
the 
tags are being messed up. Thiis causes yaffs to think that a page of flash 
is 
empty, but it is not.

-- Charles


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