Generally recent ATK releases should define NAND type automatically via NAND ID.
And there is corresponding information for the NAND flash "MT29F2G08ABAEAWP:E" in
"nand_device_info.c" (from ATK sources).
Please double check parameters "BI Swap" and "BBT", what were used to erase the NAND (via ATK). Also please pay attention if NAND signal RDY is pulled up via a resistor of ~10 KOhm.