Linux
From coreboot
Linux in the BIOS
To build a coreboot image that contains a small Linux system in the BIOS we suggest that you have a look at the buildrom utility that downloads and compiles all required components.
Downloading Buildrom
To check buildrom out of the subversion repository, please use
svn co svn://coreboot.org/buildrom
You can also get a slightly newer (and OLPC specific) version at the OLPC web page