nofb Disable framebuffer
floppy Boot from floppydisk
hd / hd1 / hd2 / hd3 Boot from (local) primary / secondary /... harddisk
-failsafe Boot with (almost) no HW-detection
debug Get shells during process of booting for debugging
bootchart Create chart of booting sequence in /var/log/bootchart.tgz
forensic Do not touch any harddisks during hardware recognition