my method is that：
1 I get the source code of coreboot
2 under the "coreboot",make menuconfig->mainborad->gizmosphere,gizmo 2
3 Deivces->Graphics initialization (Run VGA Option ROMs)
4 payload->Add a payload (SeaBIOS) ,SeaBIOS version (1.10.2)
I get the "coreboot.rom",and I dowmload it to the Gizmo 2,the Monitor is no picture,I don't know the bios is start-up or not?