We need a seabios support:
Author: Kevin O'Connor <firstname.lastname@example.org>
Date: Sat Jan 12 16:36:11 2013 -0500
boot: Support "halt" in the boot order to prevent default boot attempts.
Current seabios will attempt to boot from both configured devices and
a list of default devices. Sometimes it is desirable to only attempt
to boot from the configured devices and not from any of the default
devices. This patch adds support for a "HALT" item in the "bootorder"
file - its presence will prevent SeaBIOS from attempting any default
Signed-off-by: Kevin O'Connor <email@example.com>
Signed-off-by: Amos Kong <firstname.lastname@example.org>