overlay-beaglebone/scripts/board_specific_setup.sh

#!/bin/bash

# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Downloads and installs the MLO and copies u-boot to the ESP.
# This is used combined with a hybrid MBR to allow booting
# a Beaglebone from microSD only.
install_beaglebone_bootloader() {
  local efi_offset_sectors=$(partoffset "$1" 12)
  local efi_size_sectors=$(partsize "$1" 12)
  local efi_offset=$(( efi_offset_sectors * 512 ))
  local efi_size=$(( efi_size_sectors * 512 ))
  local mount_opts=loop,offset=${efi_offset},sizelimit=${efi_size}
  local efi_dir=$(mktemp -d)

  sudo mount -o "${mount_opts}"  "$1" "${efi_dir}"

  sudo cp "${BOARD_ROOT}/firmware/u-boot.img" "${efi_dir}/"
  sudo cp "${BOARD_ROOT}/firmware/MLO" "${efi_dir}/"
  sudo cp "${BOARD_ROOT}/firmware/uEnv.txt" "${efi_dir}/"

  sudo umount "${efi_dir}"
  rmdir "${efi_dir}"
}

board_setup() {
  install_beaglebone_bootloader "$1"
}