Re: Beagle Bone Black clock speeds with Fedora 20

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On Mon, May 5, 2014 at 3:51 AM, Peter Robinson <pbrobinson@xxxxxxxxx> wrote:
>> I have had erratic results with recent Fedora 20 kernels and a Beagle Bone
>> Black, with some kernels failing to even boot. The latest kernel -
>> 3.14.2-200.fc20.armv7hl - seems to be in generally good shape. Ethernet, USB
>> and the XFCE desktop all seem to be working well. However, one regression
>> seems to have occurred. With older kernels I got the following:
>
> Interesting on the desktop side of things, I was certain I would need
> a patch for the panel support for it to work. What xorg conf do you
> have?
>
>> modprobe cpufreq-cpu0
>> cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
>> 300000 600000 800000 1000000
>>
>> which I think is the correct set of frequencies for this board. Certainly
>> the highest speed should be 1GHz. With3.14.2-200.fc20.armv7hl I get the
>> following:
>>
>> modprobe cpufreq-cpu0
>> cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
>> 275000 500000 600000 720000
>
> Yes, in <= 3.13 we needed patches for the BBBlack but with 3.14 it
> mostly works fine without but it seems the bits for 1ghz haven't
> landed upstream. Can you file a RHBZ against the kernel  for this
> regression, reply here for the number and I'll sort out a patch.

On mainline it got held up behind the: OPP modifier

http://comments.gmane.org/gmane.linux.ports.arm.kernel/309466

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/
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