# Hardware watchdog for unattended operation. # # PID1 pets /dev/watchdog0 (intel_oc_wdt) every RuntimeWatchdogSec/2. If systemd # itself wedges for longer than RuntimeWatchdogSec, the chip hard-resets the box — # the only way to recover a hung router with nobody there to open the lid. # (See the EC-latch / USB-hub-hang history.) RebootWatchdogSec also guards against # a reboot that hangs partway. [Manager] RuntimeWatchdogSec=20s RebootWatchdogSec=5min