[Yaffs] how about write oob data firstly?

as far as i know,oob's function is to store ecc value and bad block
flag,beside,oob is same as the normal area,is that right?
if so,i'm trying to store yaffs_ext_tags in the front of every flash page.
and i will do nothin to the bad block flag position and store ecc value in
the front position of every page.can this solution work?
if i am wrong please correct me.


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Regards,
Ezio.