core/intel-ucode/intel-ucode.install

## arg 1:  the new package version
## arg 2:  the old package version
post_upgrade() {
  echo "Intel CPU ucode upgrades are no longer performed by the firmware loader."
  echo "If you want to update the Intel CPU ucode on boot, add the file"
  echo "Make sure you enable the 'microcode' hook in /etc/mkinitcpio.conf"
  echo "And regenerate kernel image with mkinitcpio"

  if which mkinitcpio >/dev/null 2>&1; then
    echo ">>> Generating initial ramdisk, using mkinitcpio.  Please wait..."
    echo ">>> If you are using non-default kernel, you should update kernel"
    echo ">>> manually"
    if [ -f etc/mkinitcpio.d/linux.preset ]; then
      mkinitcpio -p linux
    fi
    if [ -f etc/mkinitcpio.d/linux-lts.preset ]; then
      mkinitcpio -p linux-lts
    fi
  fi
}