i input this command 

 

echo -n "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo -n "1536000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

 

after,check cpu freq

 

cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

 

but it still display 120000

 

anybody can help me?

You'll probably need to update the DVFS table in the device tree. That's how the cpufreq driver knows what voltage to set for the corresponding frequency.

i am not familiar with linux , can you how to do detail describe ?

thanks a lot

IMHO, if you are not familiar it might be a bad idea to overclock your H3 CPU... It depends on kernel and board (voltageregulation is solved in two ways on H3). Is it just to see what's possible or do you want to get the max. power out of it? If the second is the case, I think you waste your time. This might be a good starting point for you.

http://linux-sunxi.org/Cpufreq

That is mean if I want overclock allwinner H3 cpu, I cant use command todo, must compile the kernel?    

uh... maybe it's impossible for me 

 

thank you for your reply