board/beaglev/genimage.cfg

image sdcard.img {
  hdimage {
    gpt = true
  }

  partition rootfs {
    partition-type-uuid = 72ec70a6-cf74-40e6-bd49-4bda08e8f224
    partition-uuid = 0fef845a-c6e1-45bc-82f7-002fa720f958
    bootable = "true"
    image = "rootfs.ext4"
  }
}