From DD-WRT Wiki

The OM1P has a hardware watchdog that will reset the device every 5 minutes if it's not reset via a GPIO device.

Permanent Fix

install DD-WRT Micro_Redboot

Workaround

After you got the route flashed you have 5 minutes to configure this.

tested on DD-WRT v24 Beta (08/03/07) std and DD-WRT v24-sp2 (10/10/09) std

go to your web interface add a custom script:

chdir / /sbin/gpio enable 3

echo "1" >/proc/gpio/3_out echo "0" >/proc/gpio/3_out

echo "1" >/proc/gpio/3_dir echo "0" >/proc/gpio/3_dir

then enable Cron under management and add this line Code:

• /4 * * * * root /tmp/custom.sh

log into via consol or web interface and restart cron

stopservice cron && startservice cron

not sure but i think you got to do this every time you restart the device.

original hw-heartbeat.sh from Open-Mesh

1. !/bin/sh
2. /sbin/hw-heartbeat.sh
3. send heartbeat to the hardware watchdog

GPO="3" MCTL="4"

[ "$(uci get node.general.hw_watchdog)" -eq 1 ] && {

1. i have no idea

gpioctl dirout $GPO ;

1. set pin $GPO (3) to direction out?

gpioctl clear $GPO

1. set pin 3 to logic 0

sleep 1

1. wait one second/milli second?

gpioctl set $GPO

1. set pin 3 to logic 1

logger -st ${0##*/} "signaling to the hw-watchdog"

1. write something to the log

}