From: Dave Jones <davej@suse.de>
To: Adrian Bunk <bunk@fs.tum.de>
Cc: linux-kernel@vger.kernel.org, arjanv@redhat.com
Subject: Re: 2.4.19-pre10-ac1: Hardcoded cpu_khz in powernow-k6.c
Date: Wed, 5 Jun 2002 03:02:23 +0200 [thread overview]
Message-ID: <20020605030223.A5277@suse.de> (raw)
In-Reply-To: <Pine.NEB.4.44.0206050236260.9994-100000@mimas.fachschaften.tu-muenchen.de>
On Wed, Jun 05, 2002 at 02:52:15AM +0200, Adrian Bunk wrote:
> Hi Dave,
>
> while reading through powernow-k6.c in 2.4.19-pre10-ac1 I found the
> following that seems to be a bug:
>
> static unsigned long cpu_khz=350000;
>
> Not every K6-2/3 runs at 350 MHz...
iirc, there aren't any MSRs[*] on the K6-2 where we can read
the current FSB. I think 350MHz was used as it was probably
the slowest K6-2 to be found at the time. You can override
it with boot time arguments.
Dave.
[*] The K6 style powernow was reverse engineered, as there were
no publically available documents explaining it. All we can
do is scale multipliers. No voltage scaling, no FSB decoding.
--
| Dave Jones. http://www.codemonkey.org.uk
| SuSE Labs
next prev parent reply other threads:[~2002-06-05 1:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-05 0:52 2.4.19-pre10-ac1: Hardcoded cpu_khz in powernow-k6.c Adrian Bunk
2002-06-05 1:02 ` Dave Jones [this message]
2002-06-05 6:04 ` Adrian Bunk
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