All ONFI compatible NAND devices are supported by the RBL. For non-ONFI NANDs, the RBL can boot only from devices whose NAND geometry can be determined either from matching manufacturer/device ID with values in a pre-determined look up table or if the RBL can determine the geometry from the 4th ID byte on the NAND. My recommendation to customers would be to select an ONFI compatible NAND device to avoid the complication of RBL looking for geometry on an non-ONFI NAND..
Please let us know if you do chose to use a non-ONFI NAND for cost reasons and we will provide you the table of device Ids and NAND geometry that is supported by the RBL.
Regards,
Rahul