[fedora-arm] BeagleBone Black CPU speed

[Peter Robinson]

>> It looks like the BeagleBone Black is still running at 550MHz with the
>> latest Fedora 20. Does anyone know what is holding it back from running at
>> 1GHz? Is the a uboot thing, or a kernel thing, or something else? I saw a
>> version of uboot referred to as making the BBB run at 1GHz, but when I tried
>> experimenting with that I got the same 550MHz clock speed.
>
> If you're interested could you try the kernel-3.13.0-1.1.fc20 scratch
> kernel [1] on your BBBlack. It should add freq scaling support and you
> should be able to tell if it detects it appropriately if the
> cpufreq-cpu0 module loads. Feedback welcome.

So that kernel works with my testing but the module doesn't auto load
the cpufreq-cpu0 module. If you do:

modprobe cpufreq-cpu0

You then get:
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
300000 600000 800000 1000000

Even with 3.12.8 you can manually load that module and it works but
you only get up to 720mhz.

Peter

> [1] http://pbrobinson.fedorapeople.org/arm-kernel/kernel-3.13.0-1.1.fc20.armv7hl.rpm