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Date: Fri, 29 Nov 2002 16:08:32 +0100 (CET)
From: Daniel Nofftz <nofftz@castor.Uni-Trier.DE>
To: Dave Jones <davej@codemonkey.org.uk>
cc: Pavel Machek <pavel@ucw.cz>, <linux-kernel@vger.kernel.org>,
       <torvalds@transmeta.com>, <alan@redhat.com>
Subject: Re: A new Athlon 'bug'.
In-Reply-To: <20021126194129.GA24152@suse.de>
Message-ID: <Pine.LNX.4.44.0211291554330.30552-100000@hades.uni-trier.de>
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On Tue, 26 Nov 2002, Dave Jones wrote:

> On Mon, Nov 25, 2002 at 10:34:47PM +0100, Pavel Machek wrote:
>  > What happens when bit is programed wrongly?
>
> The documentation I have says nothing other than "...platforms are more
> robust..." with the fix. It's purely a reliability thing, but as it's
> fiddling with the CPU clock, it's possible that it may *slightly*
> affect performance too.

hi!
maybe somone remembers that i hacked a little bit with the power saving
modes of the athlon processor. so far as i know, the clk_ctl register is
importand when the athlon processor comes back from acpi-c2 mode. in c2 he
is disconnected from the system bus and the internal clock is clocked
down. in some cases a false value in this register could prevent the
athlon processor to come back from c2 -> lockup of the machine or
something like it ...
(bug 11 of the athlon processor revision guide)

daniel


# Daniel Nofftz .......................... #
# Sysadmin CIP-Pool Informatik ........... #
# University of Trier(Germany), Room V 103 #

The resonable man adapts himself to the world. The unreasonable
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that all progress depends on the unresaonable man.
                                        George Bernard Shaw

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