I am currently working on TI AM335x board (Starter Kit) and I would like to get the OMAP watchdog working...
As far as I know the platform automatically enables the watchdog during boot and I think it is confirmed by the following messages printed out at boot:
[ 1.510192] OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
If I am not wrong at this point if I issue the following command:
echo 0 > /dev/watchdog
the board should reboot in 60 seconds, isn't it? Instead after 60 seconds nothing happens... why? Am I missing something relevant about that? Can anybody help me?
Ok, I've found the solution on my own.
As clearly told here, the file /dev/watchdog must be kept open for allowing the watchdog to fire... then the right command for causing the watchdog fire is:
cat > /dev/watchdog
and then type 0: after 60 seconds the board will reboot.