build/cbfstool build/coreboot.rom add-int -i 0 -n etc/screen-and-debugĬoreboot can initialize the GPU of some mainboards. To prevent the duplicates set the config file etc/screen-and-debug to zero. When using sgabios, all the characters that SeaBIOS writes to the screen will be seen twice - once from SeaBIOS sending the character to the serial port and once from sgabios forwarding the character. build/cbfstool build/coreboot.rom add -f /path/to/sgabios.bin -n vgaroms/sgabios.bin -t raw Place the sgabios ROM file in the vgaroms/ directory of CBFS. Most bootloaders (eg, GRUB) require a VGA BIOS in order to function properly - the sgabios ROM can fill this requirement. If the target machine does not have a VGA adapter, then one should install sgabios. One can deploy it in addition to the primary VGA BIOS or by itself. SeaBIOS will extract the VGA ROM and run it during boot.Īn sgabios option ROM can forward many VGA BIOS requests and keyboard events over a serial port. build/cbfstool build/coreboot.rom add -f /path/to/vgabios.bin -c lzma -n pci1106, -t optionromĪfter the above is done, one can write the coreboot.rom file to flash. Use the following to add a compressed option ROM instead: build/cbfstool build/coreboot.rom printĪlternatively, SeaBIOS supports LZMA compressed option ROMs. build/cbfstool build/coreboot.rom add -f /path/to/vgabios.bin -n pci1106,3344.rom -t optionrom Obtain the VGA ROM (eg, vgabios.bin) and add it to the ROM with: In the above example, the VGA vendor/device ID is 1106:3344. This information can be found from lspci:Ġ1:00.0 VGA compatible controller : VIA Technologies, Inc. The first step is to find the vendor and device ID of the built-in VGA adapter. For machines without a VGA adapter, please follow the sgabios instructions below. Note, VGA adapters on external cards (PCI, AGP, PCIe) do not require this step as SeaBIOS will automatically extract the VGA BIOS directly from the card. It is frequently necessary to add a VGA option ROM to CBFS in order to use a VGA adapter that is built-in to a motherboard. The following examples show some commonly used features. Details on the CBFS files that SeaBIOS supports are on the SeaBIOS wiki. SeaBIOS can read the coreboot flash filesystem and extract files. The resulting coreboot.rom file will contain both SeaBIOS and coreboot, and it can be flashed to a ROM chip. Then configure the SeaBIOS out/ file as the coreboot payload and build coreboot. The final SeaBIOS payload file is out/.Ĭonfigure coreboot with the following all disabled: CONFIG_VGA_ROM_RUN, CONFIG_PCI_ROM_RUN, CONFIG_ON_DEVICE_ROM_RUN Run make menuconfig and set the following variables: There's also a cgit facility to browse the latest source code online. One can download the latest version of SeaBIOS through a git repository: You just have to run the following in your coreboot checkout:īoth SeaBIOS and coreboot will be built, and SeaBIOS will be added as payload to the coreboot.rom image that is being built. Probably the easiest way to use SeaBIOS as coreboot payload is to simply use the coreboot build process, which downloads and builds SeaBIOS as payload by default nowadays. SeaBIOS has also been tested with FreeDOS, NetBSD, and OpenBSD.īecause SeaBIOS implements the standard x86 BIOS interfaces, it is expected many other operating systems and boot-loaders will work.īuilding Building via coreboot's menuconfig SeaBIOS has been tested with GRUB, LILO, and Syslinux. Please check the board documentation or ask on the mailing list if unsure of the status. Many boards do have working ACPI and are able to boot XP/Vista/Windows 7. As a result, some coreboot boards may fail during Windows boot (eg, it may fail with a STOP 0xA5 code). However, Windows has a very strict ACPI interpreter, and some coreboot boards do not have a complete ACPI definition. SeaBIOS has been tested with Windows XP, Windows 2008, Windows Vista (64/32 bit), Windows 7 (32 bit and 64 bit). SeaBIOS can initialize and use a PS/2 keyboard or USB keyboard. SeaBIOS supports booting from ATA hard drives, ATAPI CDROMs, USB hard drives, USB CDROMs, payloads in flash, and from Option ROMs (eg, SCSI or network cards). SeaBIOS also enables booting Linux out of the box (using standard boot-loaders like GRUB and Syslinux). 3.2 Adding a graphical "bootsplash" imageĪny software requiring 16-bit BIOS services benefits from SeaBIOS (eg, Windows and DOS).
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