View source for Watchdog timers on OMAP3 boards

== Watchdog timers on OMAP3 boards ==

(Work in progress)

=== Overview of this article ===

This article is meant to be a starting point for people to learn setup the watchdog timer on OMAP3 based boards.

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=== OMAP3 watchdog overview ===

There are 3 watch dogs WD1=Secure, WD2=MPU, WD3=IVA. WD1 is either taken care of by ROM (HS/EMU) or not accessible (GP). We need to take care of WD2-MPU or take a PRCM reset.  WD3 should not be running and does not generate a PRCM reset.

=== Watchdog timers under x-loader === 

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=== Watchdog timers under u-boot === 

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=== Watchdog timers under Linux kernel ===

* [http://www.kernel.org/doc/Documentation/watchdog/watchdog-api.txt Linux Watchdog driver API.]
* [http://www.kernel.org/doc/Documentation/watchdog/src Watchdog related example programs.]

 $ modprobe omap_wdt
 OMAP Watchdog Timer Rev 0x31: initial timeout 60 sec

If enable and tick the watchdog card 

 $ watchdog-test -e; watchdog-test
 Watchdog card enabled.

 Watchdog Ticking Away!

after 60 sec NOT resets.

If enable and not tick the watchdog card.

 $ watchdog-test -e
 Watchdog card enabled.

 Watchdog Ticking Away!

after 60 sec resets.

If disable the watchdog card.

 $ watchdog-test -d
 Watchdog card disabled.

after 60 sec NOT resets unless NOWAYOUT is defined (CONFIG_WATCHDOG_NOWAYOUT)

[[Category:Software]]