Hi daal
I noticed the release notes for 4.2.3 0.3 state:
* Added PXA2xx cpufreq
It doesn't seem to be working for me but maybe I missing something? I have got:
pxa27x_maxfreq=624
Appended to my kernel parameters in boot.cfg for the latest kernel but lscpu says I'm still running at 416Mhz.
Hi danboid.
I did some testing and it turns out the pxa27x_maxfreq=624 does not get passed on to cpufreq. I hardcoded now the 624Mhz in the kernel.
See attached a 4.2.3 v0.3 kernel that will boot with maxfeq 624 Mhz.
Setting it to 624Mhz or 520Mhz causes a known issue with the LCD driver, resulting in flickering.
You can change the frequency and governor via the cpufreq-set tool and check with cpufreq-info.
The PXA270 CPU found in the Cxx00 series is capable of running stable at 624 Mhz, but will get more hot.
The Z was not designed to run at that speed and components (LCD for example) are not in tune with higher clock speeds.
If I remember correctly , there used to be a fix for the LCD issue when over-clocking back in the pdaxrom days...
Cheers!