Out of curiosity, and according to several articles/posts including this one http://forum.lemaker.org/thread-1847-1-1.html the A20 has support for hardware watchdogs.

 

Has some successfully configured and used the watchdog kernel module sunxi_wdt.ko in a banana / lamobo R1?

Hi, I'm using the CubieTruck with legacy kernel and also searching for watchdog support.
 
As far as I can figure out, the kernel seems to be compiled without watchdog support:

• /dev/watchdog is not present
• and /var/log/syslog does not contain anything with sunxi_wdt

You have to load the correct kernel module to enable watchdog support in general:

nano /etc/modules
# and append this somewhere (reboot afterwards)
sunxi-wdt

And you have to install the watchdog package:

apt-get install watchdog

It is possible to configure some more stuff here:

nano /etc/watchdog.conf

But I have the feeling that it works just out of the box.

I would appreciate if you could post your experience with that settings.