Thanks Ian !
I will give it a try !
I have modified MTD layer to differentiate between the Factory Marked Bad
Blocks and Bad Blocks marked such due to "Wear" and have a command in boot
loader to be able create
Bad Block Table for only Factory Marked Bad. and thus enabling it to erase
BAd Blocks due to Wear. This allows me to recover from these issues.

I have been using YAF
BTW, do have any clue , what may be causing this behaviour (excessive
marking of Bad Blocks by YAFFS). Knowing this will allow me to reproduce and
test this issue. As this I have seen Only Couple of times on 2 different
Units, I have been using YAFFS2 for 4 months now and only recently saw this
issue.

Thanks again,

Arvind

----- Original Message ----- 
From: <ian@brightstareng.com>
To: "Arvind Agrawal" <arvind@4access-comm.com>
Cc: <yaffs@lists.aleph1.co.uk>
Sent: Tuesday, June 19, 2007 1:39 PM
Subject: Re: [Yaffs] Almost all blocks marked bad on Nand partition using
YAFFS


> Arvind,
>
> You might like to try a version I put together recently
> to run on 2.6.21, see
> http://users.actrix.co.nz/manningc/yaffs2-ian-20070523.tgz.
>
> You do not need the stuff for 9BYTE_TAGS that I added to
> this, but it also includes a change to the MTD interface
> that I needed on 2.6.21-rc6.
>
> BTW: if the NAND bad block markings are screwed up you will
> need to hack MTD to let you erase these blocks to recover them.
> I always recommend disabling the MTD's bad-block marking when
> bringing up a new board/platform and to record the NAND chips
> bad-block list before you start.
>
> -Ian
>
> On Tuesday 19 June 2007 16:00, you wrote:
> > we are using YAFFS2 on 256 MB ST Micro Nand Flash.
> > Few times we have seen when the unit is powered up and tries
> > to mount the YAFFS2 files system, most of the blocks are
> > marked bad and then every time on mount it displays the
> > messages
> > "Partially written block XXXX being set for retirement".
> >
> > And all of these blocks are now MARKED BAD in NAND BBT.
>
> http://users.actrix.co.nz/manningc/yaffs2-ian-20070523.tgz
>
> >
> > we are usinh a mix of JFFS2 on small "ROOT FS" partition and
> > YAFFS2 on larger (200MB+) partition
> > All other partitions are fine at this point.
> >
> > The Configuration we are using is
> >
> > PXA255
> > ST Micro 256MB large page NAND Flash
> >
> > Linux 2.6.20.3
> >
> > YAFFS2 - Yaffs_checkptrw.c, v 1.13 2007/02/14
> > YAFFS_CHECKPOINT_VERSION 2
> >
> > yaffs_guts.c, v 1.48 2007/03/12
> >
> > yaffs_ecc.c v 1.9 2007/02/14
> >
> >
> >
> > NAND Flash is partitioned as
> >
> > 0000 - 0x20000     ---> System Area
> > 0x20000 - 0x100000  ---> Control
> > 0x100000-0x300000  ----> kernel
> >
> > 0x300000-0x1300000 ---> Root File system ---- JFFS2
> >
> > 0x1300000-0xEE00000 ---> User File System ---- YAFFS2
> >
> >
> > Any Ideas? Does anybody else has seen similar issues
> >
> > Any help is greatly appreciated.
> >
> >
> > thanks,
> >
> > Arvind
> >
> >
> >
> > _______________________________________________
> > yaffs mailing list
> > yaffs@lists.aleph1.co.uk
> > http://lists.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs