Livio Tenze wrote:
...
> 5) I mount again the filesystem mount -t yaffs /dev/mtd/5 /mnt
> 6) If I try to read the previously written data, it is not possibile. 
> The files I copied are empty or are no longer visibile.
> 
> If I do not umount the filesystem yaffs seems to work well, but if I 
> umount the filesystem I am no longer able to read the written data.

Check for bad blocks messages in dmesg at mtd NAND chip probe time.  The 
blocks are probably being marked bad per previous email, and next time 
the chip is probed the overwritten bad block markers are read.


-- 
Todd