Re: power management on embedded linux?
- From: "cpope" <cepope@xxxxxxxxx>
- Date: Thu, 31 May 2007 16:49:41 -0400
"Cliff Brake" <cliff.brake@xxxxxxxxx> wrote in message
On May 25, 6:56 am, "cpope" <cep...@xxxxxxxxx> wrote:systems?
Does anyone have experience with power management on embedded linux
hibernateIs it mature and working? I specifically need my platform to do a
quicklywhere the system state is saved to a ram disk and then restored very
andto 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
kernelwake but I think we can handle that. I'm mostly interested in the
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.
BEC Systems, LLC
My platform is a PPC inside a xilinx fpga so when I shut the processor down
I really shut it down. I'm expecting some trouble restoring the state of the
PPC on wake up but its good to here that it works on some platforms so I'm
not charting totally new water. -Clark
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