TiBook CPU speed

[Nathan Whitehorn]

On 09/20/11 15:32, Justin Hibbits wrote:
> On Tue, Sep 20, 2011 at 2:23 AM, Nathan Whitehorn<nwhitehorn at freebsd.org>wrote:
>
>> On 09/20/11 05:07, Justin Hibbits wrote:
>>
>>> Following up on my previous email, the saga of installing FreeBSD on a
>>> TiBook, I ran into another problem: The CPU speed is reduced to 666MHz,
>>> instead of 1GHz. Is there a way to get it to run at the full 1GHz?
>>>
>>>
>> Just use cpufreq(4) -- the dev.cpu.0.freq sysctl or turn on powerd.
>> -Nathan
>>
>
> I looked at that first, but the MPC7455 doesn't have frequency scaling.  I
> looked at the Linux and Darwin sources after reading a linux page that you
> have to explicitly tell it to go full speed, and it turns out it's a PMU
> command, and requires a CPU reset, and there are two OFW properties under
> /cpu, min-clock-frequency and max-clock-frequency.

Ah, yes, this stuff. We only have cpufreq support on PPC 7447/7448 and 
on later-model G5s. If you're interested in adding support for it, I'm 
happy to discuss how best to do it.
-Nathan