Coreboot Ports Over XGI Framebuffer Support From Linux Kernel

The Coreboot project has now ported over the XGI Z9s frame-buffer support from the Linux kernel.

Old XGI graphics processors.

For helping out native graphics initialization support under Coreboot, Timothy Pearson of Raptor Engineering added native XGI Z9s frame-buffer support to this alternative to proprietary BIOS/UEFI systems.

This XGI frame-buffer port benefited the recent Coreboot port to the ASUS KFSN4-DRE series. This port was based on the frame-buffer drivr in the Linux 3.18 kernel and worked with Coreboot's SeaBIOS payload with SeaVGABIOS enabled. More details via this Git commit.