coreboot

coreboot is an open-source software stack for initialization of computers, aimed at being particularly lightweight and quick to boot. Most notable for its use by Google in Chromebooks, it can also be used to replace the stock proprietary BIOS (e.g. AMI Aptio) on many computers, including those on the 10h/15h platforms.

This website provides pre-built binaries for certain motherboards, see coreboot-15h.