Hi,

I have here a uC with a nand flash controller that computes ECC on the 
whole page at once. It has no separate bytes for spare area ECC. Which 
means that oob data cannot be written separately. Yaffs is going to be 
used on this chip and the question is that does yaffs write oob data 
separately? I looked into the sources and I see write_oob() function calls 
but I would like to have this confirmed. What possible solutions are there 
if oob data has to be written alone? Shall I implement SW ECC on the spare 
area and switch off HW ECC when only spare area is accessed?
Or shall I use linux SW ECC and that's it? I would like to avoid sw 
overhead if possible.

Any ideas are welcome, thanks,
Viktor Babrian