Originally Posted by Matan

The main difference I see is that you set both policy.max (in cpu-omap.c) and policy->user_policy.max (in cpufreq.c) to 600000, while I do not change files outside arch/arm.
I admit I'm a little lost, rereading this thread. What different behaviour do we try to explain?
You also use highest voltage level for all frequencies 600 and above.
I reduced the voltage levels of all frequencies 550-600, and only use the second highest for above 600.

Originally Posted by titan

I have uploaded a new untested version of the community kernel that is supposed to support 250,500,550,600,700,750,800,850,900,1000MHz and sets the default max to 600MHz.
for freq >= 850 the DSP is set to 500MHz.
You should be able to change the frequency range as root using

Code:

echo 600000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
echo 250000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq

The settings can be permanently stored in /etc/pmconfig

I currently don't have my USB cable (for reflashing) with me so I can't test it myself
If there are any volunteers please let me know whether it works.
Installing this new kernel is at your own risk, of course.
Be prepared to reflash the stock kernel per USB!

You can download version 19 from
http://maemory.com/N900/overclock/
install all packages and the kernel-flasher-maemo last.
Good luck!

PS: this new version also includes the Joikuspot module

Originally Posted by joerg_rw

happy BBQ
/jOERG

The ARM Cortex™-A8 processor is based on the ARMv7 architecture and has the ability to scale in speed from 600MHz to greater than 1GHz

Originally Posted by titan

I finally flashed the new kernel and it works fine, i.e. it uses the whole range down to 250 when not connected to the charger.

Originally Posted by fixfox

Why not down to 125Mhz? I believe it helps with battery consumption when max freq is above 600Mhz.