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From: Andreas Schwarz <freebsd.asc@strcmp.org>
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Date: Mon, 21 Oct 2013 01:42:36 +0200 (CEST)
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Subject: raspberry pi BCM2708 hardware watchdog
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Hi,

the BCM2708 SoC contain a hardware watchdog, using it, would be a good solution
for the people which are running a remote rpi 24/7 to avoid these sudden system 
freezes.

The watchdog (bcmwd0) is found when booting, but I'm not able to use it with the 
watchdogd (which is using /dev/fido to communicate with the watchdog). Seems
that something is still missing. Any ideas?

root@pizelot:~ # dmesg | grep Watchdog
bcmwd0: <BCM2708/2835 Watchdog> mem 0x2010001c-0x20100027 on simplebus0

root@pizelot:~ # /etc/rc.d/watchdogd start
Starting watchdogd.
watchdogd: watchdog_patpat failed: Operation not supported
watchdogd: patting the dog: Operation not supported
/etc/rc.d/watchdogd: WARNING: failed to start watchdogd

best regards,
Andreas