https://wiki.parabola.nu/Boot_Parabola_LiveISO_from_GRUB
 the disk partition containing the ISO file must have a volume label
  it is possible to use img_dev instead of img_label
 it will not be writable while the live system is running
  it is possible to remount rw
 vmlinuz
  parabola-openrc 2020.08
   vmlinuz-linux-libre
  parabola systemd 2019
   vmlinuz