Watchdog timers on OMAP3 boards
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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
$ 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)
