> However, I see the point in using a filesystem originally tailored for
> NAND...
>
> I just need making sure I can have some ECC enabled - either in MTD or
> YAFFS...


???

YAFFS supports ECC in one of two ways:

If you specify USE_NAND_ECC then yaffs assumes that the mtd is supplying ECC.
If you do not, then YAFFS supplies ECC.

-- Charles