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Information regarding usage of SRAM to reduce wake up latency

Sridhar CR
Intellectual 260 points
Other Parts Discussed in Thread: AM3352

Dear All,

I am using custom board based on beagle bone black with OS " Linux version 3.12.10-ti2013.12.01" and Sitara processor AM3352.

As per information in TI website, while going to deep sleep 0, the context information is saved ont to SRAM, which is retrieved at resume time.

Perioically we are performing minimal function such as toggling of LED (in active state) before going to sleep.

In order to reduce resume time (hence power consumption) we need to have this functionality in SRAM so that the kernel need not wake up fully.

Is there a possiblity that we can add such code in SRAM? If so, how do we do this?

If this is not possible, is there any other point early during the kernel wake up at which this can be added (without kernel waking up completely). How much is the wake up latency saving expected in case of this solution?


Thanks,
Sridhar CR