Protecting the initrd with a watchdog

hooks

#!/bin/sh
# /etc/initramfs-tools/hooks/sunxi_wdt
set -e
PREREQS=""
prereqs() { echo "$PREREQS"; }
case $1 in
   prereqs)
       prereqs
       exit 0
   ;;
esac
. /usr/share/initramfs-tools/hook-functions
manual_add_modules sunxi_wdt
exit 0

scripts:init-premount

#! /bin/sh
# /etc/initramfs-tools/scripts/init-premount/sunxi_wdt
if test -e /dev/watchdog; then
  echo "$(date) /dev/watchdog starting"
  echo 1 > /dev/watchdog
fi

scripts:local-premount

#! /bin/sh
# /etc/initramfs-tools/scripts/local-premount/sunxi_wdt
if test -e /dev/watchdog; then
  echo "$(date) /dev/watchdog stopping"
  echo V > /dev/watchdog
  echo "$(date) /dev/watchdog stopped"
fi