abslibre/unmaintained/uboot-usbarmory/boot.txt

part uuid ${devtype} ${devnum}:${bootpart} uuid
setenv bootargs console=ttyGS0,115200 console=${console} root=PARTUUID=${uuid} rw rootwait

if load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /boot/vmlinuz-linux-libre; then
  if load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /boot/dtbs/${fdtfile}; then
    if load ${devtype} ${devnum}:${bootpart} ${ramdisk_addr_r} /boot/initramfs-linux-libre.img; then
      bootz ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r};
    else
      bootz ${kernel_addr_r} - ${fdt_addr_r};
    fi;
  fi;
fi