Eric, I'm debug the one Opteron MB with NV CK 804. That chipset (SB) can use ROM Strap to set some register before control is handed to CPU. But the space it need about 0xffffffe00 to 0xfffffef. I guess that add romstarp.lds and romstrap.inc could solve the problem. And it is only needed by fallback. Please advise. Regards YH