IMX WDT: Difference between revisions
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<!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_VAR-SOM-MX6 as default | <!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_VAR-SOM-MX6 as default | ||
--> {{# | --> {{INIT_RELEASE_PARAM|RELEASE_SUMO_V1.0_VAR-SOM-MX6}}<!-- | ||
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--> {{#lst: | --> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | ||
--> {{PageHeader|{{#var:HARDWARE_NAME}} watchdog}} {{DocImage|category1=Yocto|category2= | --> {{#lst:B2QT_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | ||
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{{#vardefine:WDT_CONFIG|CONFIG_IMX2_WDT}} | |||
{{#vardefine:WDT_DESCR|IMX2+ Watchdog}} | |||
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{{#vardefine:WDT_CONFIG|CONFIG_IMX_SC_WDT}} | |||
{{#vardefine:WDT_DESCR|IMX SC Watchdog}} | |||
}} <!-- | |||
--> {{PageHeader|{{#var:HARDWARE_NAME}} watchdog}} {{DocImage|category1=Yocto|category2=Debian}} [[category:{{#var:HARDWARE_NAME}}]] __toc__ | |||
= Kernel configuration= | = Kernel configuration= | ||
The internal watchdog is enabled by default in the kernel configuration. | The internal watchdog is enabled by default in the kernel configuration. | ||
To verify that the i.MX watchdog driver ( | To verify that the i.MX watchdog driver ({{#var:WDT_CONFIG}}) is enabled in your kernel configuration: | ||
* In menuconfig: Device Drivers -> Watchdog Timer Support -> <*> | * In menuconfig: Device Drivers -> Watchdog Timer Support -> <*> {{#var:WDT_DESCR}}<br> | ||
= Using a command line = | = Using a command line = | ||
Watchdog will be activated as soon as /dev/watchdog is opened and will reboot unless the watchdog is pinged within timeout (128 is the preconfigured value). | Watchdog will be activated as soon as /dev/watchdog is opened and will reboot unless the watchdog is pinged within timeout (128 is the preconfigured value). | ||
# echo "1" > /dev/watchdog0 | |||
Within 128 seconds the board will reset. | Within 128 seconds the board will reset. | ||
= Compile watchdog test application = | = Compile a watchdog test application = | ||
There's a watchdog testing utility C code example in the kernel source tree: tools/testing/selftests/watchdog-test.c (in older kernels: Documentation/watchdog/src/watchdog-test.c). | There's a watchdog testing utility C code example in the kernel source tree: tools/testing/selftests/watchdog-test.c (in older kernels: Documentation/watchdog/src/watchdog-test.c). | ||
To cross compile it:<br> | |||
Install the toolchain and source the environment setup script, by following the {{Varlink2|Yocto Toolchain installation|{{#var:RELEASE_LINK}}}} guide, then run: | |||
$ $CC ./tools/testing/selftests/watchdog-test.c -o ./watchdog-test | $ $CC ./tools/testing/selftests/watchdog-test.c -o ./watchdog-test | ||
Latest revision as of 13:45, 19 April 2024
Warning: This page is designed to be used with a 'release' URL parameter.
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VAR-SOM-MX6 watchdog
Kernel configuration
The internal watchdog is enabled by default in the kernel configuration.
To verify that the i.MX watchdog driver (CONFIG_IMX2_WDT) is enabled in your kernel configuration:
- In menuconfig: Device Drivers -> Watchdog Timer Support -> <*> IMX2+ Watchdog
Using a command line
Watchdog will be activated as soon as /dev/watchdog is opened and will reboot unless the watchdog is pinged within timeout (128 is the preconfigured value).
# echo "1" > /dev/watchdog0
Within 128 seconds the board will reset.
Compile a watchdog test application
There's a watchdog testing utility C code example in the kernel source tree: tools/testing/selftests/watchdog-test.c (in older kernels: Documentation/watchdog/src/watchdog-test.c).
To cross compile it:
Install the toolchain and source the environment setup script, by following the Yocto Toolchain installation guide, then run:
$ $CC ./tools/testing/selftests/watchdog-test.c -o ./watchdog-test