Lower down the power consumption of calixto boards

Hello All,

                 i am new to EVM board handling, get struck into a problem and my platform is embedded linux. I am using calixto board with TI’s SitaraTM AM1808 and IntegraTM OMAPL-138 processor  with kernel 2.6.33 on it. I want to know how to lower down the power consumption of board but not by from hardware side, so i need a help where are changes needed  to be done  either from kernel configuration or from device drivers or any other source code in kernel. I have a application on calixto board. so any thing which i can handle from user space, it is possible to put processor into sleep mode when application is in idle mode. 

  I have tried  making changes in :-

1) /proc/sys/vm/dirty_ratio       

2) /sys/devices/system/cpu/cpuidle/current_governor_ro

3) /sys/power/state

4) /proc/sys/vm/laptop_mode