changing /etc/boot.conf to this should work
boot {
generate grub
default "Funtoo Linux genkernel"
timeout 3
}
"Funtoo Linux" {
kernel bzImage[-v]
}
"Funtoo Linux genkernel" {
kernel kernel-debian-sources-x86_64[-v]
initrd initramfs-debian-sources-x86_64[-v]
params += real_root=auto rootfstype=auto
}
"memtest86+" {
type linux16
kernel /memtest86.bin
}