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Revision as of 23:09, 3 July 2008 by Stepan (talk | contribs) (LegacyBIOS moved to SeaBIOS: The project was renamed)
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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 Contributions welcome!

LegacyBIOS is an open-source legacy BIOS implementation, which can also be used as coreboot payload.



You can download the latest version of LegacyBIOS through a git repository:

<source lang="bash"> $ mkdir foo $ cd foo $ git clone git:// legacybios $ cd legacybios </source>

Alternatively, the released versions of LegacyBIOS can be found at

Edit src/config.h and set the following values:

<source lang="C">

  1. define CONFIG_COREBOOT 1
  3. define CONFIG_PCIBIOS 0



<source lang="bash"> $ make AVOIDCOMBINE=1 </source>

The final LegacyBIOS payload file is out/bios.bin.elf, which can be used with coreboot v2 or v3.


Finally, you have to build coreboot (v3 in this example) with LegacyBIOS as payload:

$ cd ..
$ svn co svn://
$ cp legacybios/out/bios.bin.elf coreboot-v3/payload.elf
$ cd coreboot-v3
$ make menuconfig

Now enter the Payload menu and select Payload type and then An ELF executable payload file. Now exit the menu, save your settings, and build coreboot:

$ make

The file build/coreboot.rom (or build/bios.bin) is your final coreboot v3 image, which also contains the LegacyBIOS payload.

Running LegacyBIOS in QEMU

For running coreboot+LegacyBIOS in QEMU, you need a patched version of vgabios-cirrus.bin in your build directory first:

$ cd build
$ wget
$ unzip
$ cd ..

You can now run LegacyBIOS in QEMU:

$ qemu -L build -hda /dev/zero -serial stdio

Ready-made LegacyBIOS QEMU image


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