The wiki is being retired!
Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to https://doc.coreboot.org/. Contributions welcome!
There are two kinds of VGA support we have
1. onboard vga 2. addon card.
You need to enable two CONFIG options in your Mainboard Option.lb
#VGA Console option CONFIG_CONSOLE_VGA=1 option CONFIG_PCI_ROM_RUN=1
CONFIG_PCI_ROM_RUN will use the embedded x86 emulator to run the BIOS image in the expansion ROM of PCI device. CONFIG_CONSOLE_VGA will redirect console messages to the VGA screen once VGA card is initialized.
For addon VGA cards, you don't have to do anyting else besides these two CONFIG options. If your mainboard has an onboard VGA chip and you insert another VGA addon card, the addon VGA card will be used instead of the onboard VGA chip.
If you want to use the onboard VGA chip, you have to do the following in additional to the CONFIG options described above.
1. in MB Config.lb You need to specify for your onboard VGA
device pci 9.0 on # PCI chip drivers/pci/onboard device pci 9.0 on end register "rom_address" = "0xfff80000" #512k image #register "rom_address" = "0xfff00000" #1M image end end
Please make sure the device num should be right. Otherwise it can not get exact ROM address.
2. You still need to modify your target Config.lb. in normal section
romimage "normal" # 48K for SCSI FW or ATI ROM option ROM_SIZE = 475136
It will leave space for vga option rom in flash.
3. So at last for your linuxbios.rom, you should do
cat atix.rom linuxbios.rom > final_linuxbios.rom
you need to make sure the final_linuxbios.rom size is 512k or 1M.
please use dd to get you atix.rom when running Normal BIOS.