[pm] keep Cortex M3 cores running while OMAP4 is suspended?

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Hi All,

I was wondering whether it is possible to keep the Cortex M3 cores running while the OMAP processor is suspended. 

My testing environment was simple: I used Pandaboard (OMAP4430) and kernel 2.6.35. I wrote an M3 program to toggle one GPIO pin (which drives a LED). As long as the M3 program is running, the LED will blink.

On the kernel side, I tried to change the suspend functions in arch/arm/mach-omap2/pm44xx.c. I set the states of core_pwrdm and l4per_pwrdm to ON, right before the system suspends. However, when the system was suspended (omap4_pm_suspend() was invoked), the LED stopped to blink. I think the M3 cores were powered off then.

Did I miss anything? I'll really appreciate any input. Thanks!

-Felix

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