Edited by Vlad at 2015-11-7 06:30

According to temprerature monitor and frequency control i would have max freq as:
* 1008000 for a full load of all the cores by ffmpeg conversion (t is 65C). This case is ok, i can it without problem.
* 2000000, may be more, for single core compilation of a sources (t is 55C on 1536000 freq). This limit isn't available

But!
on the new kernel the cpu freq can't be assigned above 1536000

How to assign some above 1536000 to /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq ???

P.S. Heatsinks are attached to cpu and mem chips on my OP+

Looks like its hardcoded into the kernel.

Although i doubt CortexA7 can handle any more than ~1.6Ghz.... 1.53G is already pretty overclocked for such design... Normally, cortex a7 designs runs at ~1000-1200Mhz tops.

I have to point on the insteresting lines in the official ubuntu vivid mini distribution (/etc/rc.local):

# ** Overclock to 1.728 GHz 1728000
# echo 1728000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

So. I am pretty shure kernel can overclock CPU to 1728000hz without rebuild. Can't?

What about 2,000,000 hz?

Edited by bronco at 2015-11-18 03:29

That's bullsh*t: Please have a look at http://linux-sunxi.org/Orange_Pi_PC#CPU_clock_speed_limit

The "up to 1.6 GHz" is marketing stuff.

Usually these cpu can run at 2ghz, but....this freq is shared with gpu, so you have to take off 300mhz for it.
If you want to do some test, you have to change the values in script.bin too, setting up voltages related to freq..
It's not wasy to find the correct balance with cpu, gpu and voltages.
Good luck