Hello Paul, All.
So you currently do not use any VGA BIOS? Could you post (even paste) the exact steps you tried please.
currently i use Alien's vga bios file 65536 bytes from end of page http://www.coreboot.org/index.php?title=ASRock_E350M1&oldid=11114
before i was trying to use instructions from http://www.coreboot.org/VGA_support to get bios from vendor BIOS bios_extract on (flashrom -r bios.rom) file - failed (Error: Unable to detect BIOS Image type.) script from Peter Stuge on working linux - gave me 57856 bytes file using which i get no video (and seems not even POST complete)
not sure if the size matters to success, but truncating Alien's file from 65536 to 57856 and try to diff with mine shows they are different though looking very simillar in the beginning and in the end in HEX.
With best wishes, openvoid