"Boot with standard options"  "BOOT_IMAGE=/boot/gentoo nodhcp secureconsole root=live:CDLABEL=gentoo-amd64-livegui rd.live.dir=/ rd.live.squashimg=image.squashfs cdroot"
"Boot to single-user mode"    "BOOT_IMAGE=/boot/gentoo nodhcp secureconsole root=live:CDLABEL=gentoo-amd64-livegui rd.live.dir=/ rd.live.squashimg=image.squashfs cdroot single"
"Boot with minimal options"   "ro root=/dev/mapper/root"