Mpc5125 nfc hw ecc problems

Hi,

I'm trying to port the nfc nand driver from 2.6.39.1 linux kernel to 3.14.4
using 4k nand blocks and 2k page size and 24bit hw ecc.

At the current time I have been able to make ecc, page read, and page write
to work but I cannot make oob read and write to work.

The main problem I'm facing is that I don't know how the ecc layout in the
spare area works in mpc5125.

Please, could anybody tell where I could get information about how to tell
linux the correct ecc oob parameters?

Thanks in advance,
Daniel