Xingxing.li: Created page with " === '''Watchdog''' === A Watchdog Timer (WDT) is a hardware circuit that can reset the computer system in case of a software fault.
AOM-3821 supports one ext..."

2026-01-06T02:36:04Z

Created page with " === '''Watchdog''' === A Watchdog Timer (WDT) is a hardware circuit that can reset the computer system in case of a software fault. AOM-3821 supports one ext..."

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=== '''Watchdog''' ===

A Watchdog Timer (WDT) is a hardware circuit that can reset the computer system in case of a software fault.  AOM-3821 supports one external watchdog. The default value of timeout is 60 seconds, and it can be set from 1 second to 6527 seconds.

=== '''Check watchdog device''' ===

List watchdog device.
<pre># ls /dev/watchdog
/dev/watchdog</pre>

=== '''Usage''' ===

Here are two ways to use watchdog: 1. Use “echo” command Writing any character except the specific magic character 'V' will open the  watchdog, and write once before the timeout (60 seconds by default) passes,  otherwise the system will reboot.
<pre># echo A > /dev/watchdog</pre>

Writing the specific magic character 'V' to stop the watchdog.cc
<pre># echo V > /dev/watchdog</pre>

2. Write a program using “ioctl” See more details in [BSP]/kernel/Documentation/watchdog/watchdog-api.rst.

AOM-DB3500 Watchdog - Revision history

Xingxing.li: Created page with " === '''Watchdog''' === A Watchdog Timer (WDT) is a hardware circuit that can reset the computer system in case of a software fault. AOM-3821 supports one ext..."

Xingxing.li: Created page with " === '''Watchdog''' === A Watchdog Timer (WDT) is a hardware circuit that can reset the computer system in case of a software fault.
AOM-3821 supports one ext..."