Watchdog

Introduction

Watchdog is actually a timer that will start counting once the board
is powered up. System or software needs to repeatedly communicate with
it and reset the countdown during a specific period to detect and
recover from malfunctions.This process is typically called feeding.

If watchdog is not fed in time or there is any timeouts,  system or
application being trapped in a cycle or being stuck occur. At this
time, watchdog will send a signal to reset the SOC in order to pull
the system or application out of the current situation.

This section will show you how to use watchdog on EC-AGXOrin.

External Watchdog

EC-AGXOrin also has an external watchdog,device node in system is
"/dev/wdt_crl".

Usage:

   # Enable the wdt
   echo e > /dev/wdt_crl

   # Set the timeout, there're 4 available values:
   echo 0 > /dev/wdt_crl # 0.64 Sec
   echo 1 > /dev/wdt_crl # 2.56 Sec
   echo 2 > /dev/wdt_crl # 10.24 Sec
   echo 3 > /dev/wdt_crl # 40.96 Sec

   # Disable the wdt
   echo d > /dev/wdt_crl