Last weekend I successfully booted seabios from grub2 with native video support.

This had been previously reported on www.coreboot.org/pipermail/coreboot/2014-February/077306.html

If you want to do the same:

 - get the latest seabios, no need for a specific branch anymore (I'm using 3aa31d7d6375303fc88438021aad485f50bb1e39)

git clone git://git.seabios.org/seabios.git seabios

 - configure it with the attached configuration file, or at least enable CONFIG_COREBOOT and CONFIG_VGA_COREBOOT as per the original instructions (http://www.coreboot.org/pipermail/coreboot/2014-February/077245.html)

 - add seabios.elf and its vga rom to the CBFS payload (supposing you cloned seabios into ../payloads) with:

cbfstool coreboot.rom add -f ../payloads/seabios/out/bios.bin.elf -n elf/seabios.elf -t raw && cbfstool coreboot.rom add -f ../payloads/seabios/out/vgabios.bin -n vgaroms/vgabios.bin -t raw

The add -t raw seems to be important. I had boot problems that required a reflash after using add-payload and a few other experimental settings. Since I was investigating other issues, I did not try to explore that and return to a working setup instead.

 - add to your grub.cfg

menuentry '2: SeaBios' {

        insmod cbfs

        chainloader (cbfsdisk)/elf/seabios.elf

}

That's it! I could successfully start an old grub from the hard drive, but not its memtest86 menu entry.  Likewise, bootable USB stick or a windows partition can not be started. I'm still investigating.

Any help or suggestion would be appreciated!