This patch adds support for the lsi53c895a scsi host adapter,
allowing seabios to boot from scsi disks and cdroms connected
to the lsi scsi hba emulated by qemu.
This driver was written by looking at the expectations of qemu's
lsi emulation. I have no idea idea how close this is to work on
real hardware, and I somehow doubt anyone cares given the age of
physical lsi scsi cards. It depends on !COREBOOT for that reason.