Re: power management on embedded linux?

On May 25, 6:56 am, "cpope" <cep...@xxxxxxxxx> wrote:
Does anyone have experience with power management on embedded linux systems?
Is it mature and working? I specifically need my platform to do a hibernate
where the system state is saved to a ram disk and then restored very quickly
to wake up.

Depending on the processor, it works. If you are talking about ARM
processors, typically the SDRAM is put into self refresh, and the
processor is put into a low power state with the system consuming a
couple mA of current. On resume, you take the SDRAM out of self
refresh, and them jump to where you left off in the kernel. The
PXA270 has working suspend/resume support, so that may be a useful
reference. What processor are you thinking of using?

I know there are alot of issues with getting various devices to sleep and
wake but I think we can handle that. I'm mostly interested in the kernel
itself.

Yes, the kernel can typically handle it. But, this often a lot of
work to get the drivers to behave correctly, etc. The kernel does
have a mechanism to register power management callback functions, etc.

Good luck.
Cliff

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BEC Systems, LLC
http://bec-systems.com

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