# Watch Dog

**URL:** <https://forums.developer.nvidia.com/t/watch-dog/66841>\
**Category:** Jetson TX2\
**Created:** [October 31, 2018, 9:43am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841 "2018-10-31T09:43:34Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![1481453418](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@1481453418](https://forums.developer.nvidia.com/u/1481453418)\
**Post date:** [October 31, 2018, 9:43am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841/1 "2018-10-31T09:43:34Z")

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I want to use a watchdog to see if the TX2 system is down.Can I learn from that what should I do?Is there any reference material for reference?

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**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\
**Post date:** [November 1, 2018, 2:02am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841/2 "2018-11-01T02:02:29Z")

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You could refer to L4T documentation → Watchdog Timer.

> **[Jetson Download Center](https://developer.nvidia.com/embedded/downloads)**

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**Author:** ![1481453418](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@1481453418](https://forums.developer.nvidia.com/u/1481453418)\
**Post date:** [November 8, 2018, 3:17am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841/3 "2018-11-08T03:17:56Z")

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> [@WayneWWW](#):
>
> You could refer to L4T documentation → Watchdog Timer.
> 
> [https://developer.nvidia.com/embedded/downloads](https://developer.nvidia.com/embedded/downloads)

I can not find it. Could you tell me agin?

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**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\
**Post date:** [November 8, 2018, 3:23am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841/4 "2018-11-08T03:23:47Z")

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Which file?

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<div class="post-metadata">

**Author:** ![1481453418](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@1481453418](https://forums.developer.nvidia.com/u/1481453418)\
**Post date:** [November 8, 2018, 3:26am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841/5 "2018-11-08T03:26:04Z")

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I find this link:  
[https://devtalk.nvidia.com/default/topic/975935/jetson-tx1/how-can-i-change-the-timeout-value-and-kick-watchdog-on-jetson-tx1-/](https://devtalk.nvidia.com/default/topic/975935/jetson-tx1/how-can-i-change-the-timeout-value-and-kick-watchdog-on-jetson-tx1-/)

I know “/arch/arm64/configs/tegra21\_defconfig” on jetson TX1.

But what is it corresponding to on TX2?

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**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\
**Post date:** [November 8, 2018, 4:21am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841/6 "2018-11-08T04:21:57Z")

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tegra18\_defconfig is for tx2. Please refer to L4T document for introduction to watchdog timer.

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<div class="post-metadata">

**Author:** ![1481453418](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@1481453418](https://forums.developer.nvidia.com/u/1481453418)\
**Post date:** [November 13, 2018, 2:26am UTC](https://forums.developer.nvidia.com/t/watch-dog/66841/7 "2018-11-13T02:26:37Z")

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hello，WayneWWW:  
I find the tegra18\_defconfig in the kernel src. But I can’t find the watchdog timer in the L4T document.  
There are the following contents in the L4T document:  
Watchdog  
Feature Notes  
Tegra Watchdog Watchdog reboot from hang  
Tegra Watchdog Watchdog kick  
PMIC Watchdog Watchdog reboot from hang  
PMIC Watchdog Watchdog kick