PROCESSOR-SDK-AM335X: Watchdog timer cannot be started on Linux kernel version 6.1 customized with Processor SDK Linux for AM335X 09_01_00_001

Takashi Nakazawa

Tool/software:

Hi Ti experts,

I am customizing the Linux kernel using PROCESSOR-SDK-AM335X.

I ran [echo 0 > /dev/watchdog] to start the watchdog timer and got The message [watchdog: watchdog0: watchdog did not stop!] is output.

However, the watchdog timer itself seems to start working, and after a while, a reset occurs.

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Kernel config settings

CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_CORE=y
# CONFIG_WATCHDOG_NOWAYOUT is not set
CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED=y
CONFIG_WATCHDOG_OPEN_TIMEOUT=0
# CONFIG_WATCHDOG_SYSFS is not set
# CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT is not set

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Is there anyone who can solve this problem?

Thank you for your support.

2 months ago

0 Nick Saulnier 2 months ago

TI__Guru* 89965 points

Hello there,

I see the same thing the first time I start the watchdog running. This does not seem to prevent the watchdog from functioning on kernel 6.1. See my tests here:
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1401827/processor-sdk-am335x-watchdog-is-tainted-during-kernel-boot-up/5422321#5422321

With that said - will you ever need to stop and re-start the watchdog timer in your application? Based on tests with that thread I just linked, I am not sure if the watchdog shutdown is happening properly in usecases where the watchdog must be stopped and re-started.

Regards,

Nick

0 Takashi Nakazawa 2 months ago in reply to Nick Saulnier

Prodigy 30 points

Thanks for your reply Nick.


A watchdog timer is used to check if the application is alive.

After checking again, I found that the message that the watchdog timer cannot be stopped does not mean that it cannot be started.

Thank you for your advice.

Regards,

Nakazawa

Processors

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PROCESSOR-SDK-AM335X: Watchdog timer cannot be started on Linux kernel version 6.1 customized with Processor SDK Linux for AM335X 09_01_00_001