I want to change the watchdog timeout time

[insu8897]

Hi I am configuring a Jetson AGX Xavier industrial custom board and I am using l4T version 35.4.1

I searched the forums to change the watchdog timeout time and ended up configuring an app. I’ll share some of the code.

uint32_t SetWatchDogTimeout(int timeout) {
int fd = open(“/dev/watchdog”, O_RDWR);
if (fd == -1) {
perror(“Failed to open /dev/watchdog”);
return STATUS_ERROR;
}

if (ioctl(fd, WDIOC_SETTIMEOUT, &timeout) == -1) {
    perror("Failed to set watchdog timeout");
    close(fd);
    return STATUS_ERROR;
}

printf("Watchdog timeout set to %d seconds.\n", timeout);
close(fd);
return STATUS_SUCCESS;

}

In fact, when I tried to change the timeout through the app, I found that it rebooted after the set time, so I confirmed that the change was made.

However, if you start Watchdog again after changing the time, it goes back to 60 seconds.

root@jetson-agx-xavier-industrial:~# debug-app watchdog stop
Stopping watchdog daemon…Watchdog service stopped.
root@jetson-agx-xavier-industrial:~# debug-app watchdog settime 30
[ 694.411095] tegra_wdt_t18x 30c0000.watchdog: Watchdog(0): wdt timeout set to here 30 sec
Watchdog timeout set to 30 seconds.
[ 694.411535] watchdog: watchdog0: watchdog did not stop!
root@jetson-agx-xavier-industrial:~# debug-app watchdog start
Starting watchdog daemon…[ 700.423605] tegra_wdt_t18x 30c0000.watchdog: Watchdog(0): wdt timeout set to here 60 sec
done
Watchdog service started.

I think I’m using the tegra_wdt_t18x driver… I can’t find the part where I set the timeout when the watchdog starts.
Please help me change it dynamically.

[DaneLLL]

Hi,
It looks like it will be set to default value and you would need to configure it after it is started. You may have a binary to set it in system startup(after watchdog is initialized).

Here is a sample code for reference:
Use of TX2 Watchdog peripheral - role of WDT_TIME_OUT input - #3 by ShaneCCC