http://groups.google.com/group/beagleboard/browse_thread/thread/4a237f8e1130e608


==results 7za b compressing===
<pre>
720MHz DDR2 266  = 211
950MHz DDR2 266  = 278
950MHz DDR2 300  = 281
980MHz = fail

</pre>


setting DDR freq doesn't seem affect.



== read cpu freq scaling==
 http://processors.wiki.ti.com/index.php/AM335x_Power_Management_User_guide


== c program ==
#guide: http://nixdev.com/?p=330
#github: https://github.com/c2h2/bclock


At first i tried to overclock the MPU by manually set the MPU registers. The registers who controls the MPU-freqency is CM_DIV_M2_DPLL_MPU and CM_CLKSEL_DPLL_MPU.

The ADPLLS calculates the MPU clock by following formula:

CLKINP * [1 / (N+1)] * [M] * [1/M2]

CLKINP is the source input-clock, 24.

N is the divider in CM_CLKSEL_DPLL_MPU

M is the multiplier in CM_CLKSEL_DPLL_MPU

M2 is the divider in CM_DIV_M2_DPLL_MPU