watchdog 5.3.1-3 (ia64 binary) in ubuntu gutsy

 The watchdog program writes to /dev/watchdog every ten seconds.
 If the device is open but not written to within a minute the machine
 will reboot -- a feature available when "software watchdog" support
 is compiled into the kernel.
 .
 The ability to reboot will depend on the state of the machine
 and interrupts.