> 
> This is the symptom seen when YAFFS2 is used with stock mtd. You need a
> patch to the YAFFS2 mtd interface file. The patch can be found in the
> mailing list archive.

The latest MTD git version is free from this drawback, though I'm afraid yaffs2 is not compliant with it, so you will need to tweak it a bit.

Vitaly