LinuxBIOS is primarily Linux - about 10 lines of patches to the current Linux kernel.
Additionally, the startup code - about 500 lines of assembly and 5000 lines of C - executes 16 instructions to get into 32-bit mode and then performs DRAM and other hardware initialization required before Linux can take over.
The primary motivation for the project was maintenance of large clusters, but not surprisingly interest and contributions have come from people with varying backgrounds.
