Does TMS320C6657 support the nand flash MT29F4G08ABADAH4?

Sean,

C6657 has a EMIF interface which supports NAND ONFI 1.0 compliant parts that require upto 4-bit ECC so this NAND should work with C6657. However, we always ask customers to evaluate before placing orders in large quantities or for mass production.

For additional confidence, the OMAPL138/C6748 parts have the same EMIF interface and have been tested with NAND from this Micron family as you can see here:
processors.wiki.ti.com/.../List_of_NANDs_devices_supported_by_TI_RBLs

Regards,
Rahul