There is a hardware watchdog in the CPU. The kernel driver is already built by default.

To get a userspace watchdog binary:

1. Edit:

slug/openembedded/packages/busybox/busybox{busybox version}/slugos/defconfig

and set WATCHDOG=y

2. Rebuild busybox (remove appropriate files from under tmp/stamps/)

busybox will now include a /usr/sbin/watchdog binary.

3. Add:

/sbin/watchdog /dev/watchdog

to your startup scripts.

e.g.

#!/bin/sh



case "$1" in
  start)
        echo -n "Starting watchdog: "
        start-stop-daemon -S -n watchdog -x /sbin/watchdog -- /dev/watchdog
        echo "done"
        ;;
  stop)
        echo -n "Not stopping watchdog (that would be daft)."
        echo -n "If that's really what you want, use \"reallystop\"."
        ;;
  reallystop)
        start-stop-daemon -K -n watchdog
        echo "done"
        ;;
  restart)
        $0 reallystop
        $0 start
        ;;
  *)
        echo "Usage: $0 { start | stop | reallystop | restart }" >&2
        exit 1
        ;;
esac

exit 0

FIXME - this should really be in the repository, along with the relevant init.d script, I think.