raspberry pi BCM2708 hardware watchdog

[Jia-Shiun Li]

On Tue, Oct 22, 2013 at 1:24 PM, Oleksandr Tymoshenko
<gonzo at bluezbox.com> wrote:
>
> Watchdog was used for rebooting device only.  I've just committed support for
> actual watchdog function: http://svnweb.freebsd.org/changeset/base/256871
>

Hi,

I tried playing the watchdog for a while,  but it does not seem to be
set correct timeout.

I tried to set timeout to 120 seconds to test with the following
command, but get immediate reset after around 1~2 seconds:

---8<---
# watchdogd --debug -t 120 --pretimeout 15 --pretimeout-action
log,printf -e 'sleep 60' -w
shifted 137438953472
seconds_to_pow2ns: seconds: 120, ns 120000000000, power 37
Timeout for -t is 2^37 nanoseconds (in: 120 sec -> out: 137 sec
438953472 ns -> 13745 ticks)
Timeout is 2^37 nanoseconds
---8<---

but if I omit the -e command, rpi will keep running and the watchdog
hardware seems correctly being kicked by watchdogd.

If I directly test with
  watchdog -d -t 120
it also reboots almost immediately. It there something wrong or did I
misunderstand it? I am running

FreeBSD raspberry-pi 11.0-CURRENT FreeBSD 11.0-CURRENT #2 r257094: Sat
Oct 26 00:16:37 CST 2013
jsli at 4cbsd:/rpi/obj/arm.armv6/usr/src/sys/RPI-B  arm


Regards,

Jia-Shiun.