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how to reduce AM335x Power Consumption

Other Parts Discussed in Thread: TPS65910, AM3359

My board is refer to AM335X starter kit hardware:

cpu: am3359 800MHz   DCDC is TPS65910 with 5V input .

2 ethernet mac ar8031  ddr3 

the software is on linux platform, only use some GPIOs, 2ethernet ,rtc ,eeprom,and uart.

but power consumption is up to 1.5W @5V input in active mode.

I want the power consumption to reduce in active mode,what should I do with my software?

Can I close any functions of cpu to reduce power Consumption?

If I can ,how to do ?  Modify the linux kernel or do it in my application?