post_install() {
  echo '# Install U-Boot to SD / MMC card:'
  echo '# sh /usr/lib/u-boot/platform_install.sh /dev/mmcblkX'
  mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr
}

post_upgrade() {
  post_install
}

pre_remove() {
  rm -f /boot/boot.scr
}