menuentry "test1" {
loopback loop (hd0,2)/boot/iso/debian.iso
linux (loop)(hd0,2)/casper/vmlinuz boot=casper iso-scan/filename=(hd0,2)/boot/iso/debian.iso noeject noprompt --
initrd (loop)(hd0,2)/casper/initrd.lz
}

menuentry "test2" {
  loopback loop (hd0,2)/boot/iso/debian.iso
  linux (loop)/casper/vmlinuz boot=casper fromiso=/boot/iso/debian.iso nopat noeject boot=fll vga=791
initrd (loop)/casper/initrd.lz
}

menuentry "test3" {
  loopback loop (hd0,2)/boot/iso/debian.iso
  linux (loop)(hd0,2)/linux vga=normal --
  initrd (loop)(hd0,2)/initrd.gz
}
menuentry "test4" {
  loopback loop /boot/iso/debian.iso
  linux (loop)/linux vga=normal --
  initrd (loop)/initrd.gz
}