Linino Watchdog

Official Hardware Classic Yún
1

Hi,

Is the watchdog on Linino active by default ? If it is, does this means it will automatically reboot if Linino freezes for any unforeseen reason ?

Thanks in advance!

2

Yes.

ls /dev/watchdog -al
crw-r--r--    1 root     root       10, 130 Mar  9 08:50 /dev/watchdog

means hardware driver is loaded

ps |grep watchdog
861 root      1504 S    /sbin/watchdog -t 5 /dev/watchdog
2179 root      1496 S    grep watchdog

means service is started.

killall -9 watchdog

testing watchdog, if after few second Yun is reboot then watchdog is working.

3

Thanks sonnyyu,

I was reading that the 32u4 also has a "watchdog" that can be setup.

Do you know if the watchdog on the 32u4 side is reseted at startup (so it does not get caught up in an infinite "booting" loop).

I found this post about it: Watchdog in Arduino Library - or at least support by bootloader - #58 by system - Project Guidance - Arduino Forum

But have not found a definite answer yet...

Thanks again,

sonnyyu:
Yes.

ls /dev/watchdog -al

crw-r--r--    1 root     root       10, 130 Mar  9 08:50 /dev/watchdog




means hardware driver is loaded

ps |grep watchdog
861 root      1504 S    /sbin/watchdog -t 5 /dev/watchdog
2179 root      1496 S    grep watchdog




means service is started.

killall -9 watchdog




testing watchdog, if after few second Yun is reboot then watchdog is working.
4

bilica:
...
Do you know if the watchdog on the 32u4 side is reseted at startup (so it does not get caught up in an infinite "booting" loop).
...

No, 32u4 side is not reseted at linono reboot.

You need reset it by yourself.

nano /etc/rc.local

/usr/bin/reset-mcu
wifi-live-or-reset
exit 0
5

Sorry sonnyyu, I did not expressed myself properly.

I meant the AVR command:

wdt_enable(WDTO_8S);

and

wdt_reset();

I would like to know if, on reboot, the 32u4 will remove the wdt_enable() command (so it prevents from going into an undesirable infinite loop of reboots).

Thanks

sonnyyu:

bilica:
...
Do you know if the watchdog on the 32u4 side is reseted at startup (so it does not get caught up in an infinite "booting" loop).
...

No, 32u4 side is not reseted at linono reboot.

You need reset it by yourself.

nano /etc/rc.local

/usr/bin/reset-mcu

wifi-live-or-reset
exit 0

6

You might post it at Using Arduino :: Microcontrollers forum?

http://forum.arduino.cc/index.php?board=67.0

7

Thanks I will try there - although I have already tried Arduino Forum :: Using Arduino :: Project Guidance

[Project Guidance - Arduino Forum

sonnyyu:
You might post it at Using Arduino :: Microcontrollers forum?

Microcontrollers - Arduino Forum

](Project Guidance - Arduino Forum)