> -----Original Message-----
> From: yaffs-bounces@lists.aleph1.co.uk [mailto:yaffs-
> bounces@lists.aleph1.co.uk] On Behalf Of hgh
> Sent: Friday, 23 May 2008 6:17 PM
> To: yaffs@lists.aleph1.co.uk
> Subject: [Yaffs] about retiring block
> 
> hi,all
> I am a fresher ,just have read the code for a few week.
> As I know, the OOB can only be programmed once. But
> yaffs_RetireBlock will modify it directly, right?
> How that happen?

Yaffs1 does do multiple writes to the OOB. This is permissible by
single-level flash - you can clear bits at any time, but to set them
needs an erase cycle - and Yaffs1 only does that once in the lifetime of
the block (to retire it).

Yaffs2 does not do multiple writes to the OOB, because it supports
multi-level flash (MLC).

James