Ubuntu 10.04 from .iso
map /iso/ubuntu-10.04-desktop-i386.iso (0xff)
map --hook
root (0xff)
kernel /casper/vmlinuz
file=/cdrom/preseed/ubuntu.seed boot=casper
iso-scan/filename=/iso/ubuntu-10.04-desktop-i386.iso quiet splash
locale=en.UTF-8 --
initrd /casper/initrd.lz