Date: Tue, 20 Sep 2011 09:33:18 -0400 From: Justin Hibbits <jrh29@alumni.cwru.edu> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Fwd: TiBook CPU speed Message-ID: <CAHSQbTBBMZjxkh-uUuEj0ZWX%2BqMpzAVyVLHrcszuf_8zbkby2Q@mail.gmail.com> In-Reply-To: <CAHSQbTAtswwct0UwtPDSZy687vDrxy8MUFJZUq8i%2BVW5tu=YFA@mail.gmail.com> References: <D0044AC4-3D05-4ACA-89FD-C10AE701EA65@po.cwru.edu> <4E78315F.1040404@freebsd.org> <CAHSQbTAtswwct0UwtPDSZy687vDrxy8MUFJZUq8i%2BVW5tu=YFA@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
D'oh, didn't hit 'Reply All'. ---------- Forwarded message ---------- From: Justin Hibbits <jrh29@alumni.cwru.edu> Date: Tue, Sep 20, 2011 at 9:32 AM Subject: Re: TiBook CPU speed To: Nathan Whitehorn <nwhitehorn@freebsd.org> On Tue, Sep 20, 2011 at 2:23 AM, Nathan Whitehorn <nwhitehorn@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. - Justin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAHSQbTBBMZjxkh-uUuEj0ZWX%2BqMpzAVyVLHrcszuf_8zbkby2Q>