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Date:      Sun, 02 Mar 2014 21:05:08 -0700
From:      Ian Lepore <ian@FreeBSD.org>
To:        Jordan Starcher <jstarcher@gmail.com>
Cc:        "freebsd-arm@freebsd.org" <freebsd-arm@FreeBSD.org>
Subject:   Re: Raspberry Pi Clock Frequency
Message-ID:  <1393819508.1149.274.camel@revolution.hippie.lan>
In-Reply-To: <CAJTeA=Jmzu-yOdDm4MKKW-p9zfJYnr-7_Aeq1w5DYzh8G-9R6w@mail.gmail.com>
References:  <CAJTeA=Jmzu-yOdDm4MKKW-p9zfJYnr-7_Aeq1w5DYzh8G-9R6w@mail.gmail.com>

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On Thu, 2014-01-23 at 23:31 -0500, Jordan Starcher wrote:
> Hi,
> 
> I was wondering if it is possible to adjust the CPU frequency on the
> Raspberry Pi under FreeBSD 10.0-RELEASE? I've been trying to find what the
> clock is currently set at using sysctl but I cannot seem to find any values
> that show the frequency. I also checked the FreeBSD kernel source and did
> not see any related tunable aside from hw.bcm2835.min_freq. Is this the
> tunable I would use?
> 
> Thanks,
> Jordan

I just realized this never got answered, sorry about that.

That tunable you mention was a workaround for rpi sdcard problems, and
it never actually helped anyway and should probably be removed.

If there's a way to change the cpu frequency, it's not in the scanty
little doc I've got about that processor.  If it can be done, the how-to
can probably be found in the linux source, but I don't have time to work
on it.

-- Ian





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