System Watchdog (Linux)

(available in Software Version 4.10 and newer)

The iam camera supports a system watchdog. It can recognize a system hang due for example by a segmentation fault and reboot the system automantically.

A way to enable the watchdog is to uncomment the following line in the autostart (etc/iam/autostart.sh):

watchdog -t 5 -T 20 /dev/watchdog0

A short description of the watchdog function is also available in the autostart script:

##########################################################################
# Usage: watchdog [-t N[ms]] [-T N[ms]] [-F] DEV                         #
#                                                                        #
# Periodically write to watchdog device DEV                              #
#                                                                        #
#         -T N    Reboot after N seconds if not reset (default 60)       #
#         -t N    Reset every N seconds (default 30)                     #
#         -F      Run in foreground                                      #
#                                                                        #
# Use 500ms to specify period in milliseconds                            #
#                                                                        #
# Command to crash the system with a kernel panic for watchdog test:     #
# echo c > /proc/sysrq-trigger                                           #
##########################################################################

Or enter the following command in the linux console:

root@iam_lvds:~# watchdog --help

The watchdog can be configured individually. In our configuration the system recognize a system hang between 15 and 20 seconds.

Useful Links

Cadence WDT Driver

Zynq UltraScale+ MPSoC Restart solution

References

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