Re: Yaffs Packed Tags and bad block markings

On Wed, 2005-03-23 at 23:46 +0100, Thomas Gleixner wrote:
> On Wed, 2005-03-23 at 16:55 -0500, Lance Ware wrote:
> > I am using yaffs2 and i am looking at the arrangement of the extended
> > tags areas.  My question is i have a Samsung chip which uses bad block
> > markers at the 0 byte of the 64-byte spare area.  But when i pass the
> > extended tags parameter to my nand_write function, the bad block maker
> > is overwritten with the tag information. 
> 
> What is your nand_write function ? Userspace application ?
> 
> >  I was wondering was their a way to change the arrangement of the bad
> > block marker. 
> 
> No

Oops, I forgot about bad block tables, but there is no necessity to use
them.

The NAND driver can create bad block table(s) on the first detection of
the chip. Then the bad block marker position is not longer reserved,
because the driver scans for bad block tables instead of the oob bits,
which mark the block bad. This requires to have intact bad block
information on the first detection.

tglx