Imx28 2.6 cpufreq
From embeddedTS Manuals
The i.MX28 CPU can run at multiple frequencies. By default the CPU runs at maximum speed, 454 MHz, but can be lowered for power savings.
See current speed:
cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
454736 # Default speed
Set speed to lowest:
echo 261818 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
Set speed to highest:
echo 454736 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed