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To: Alan Cox <alan@redhat.com>
Cc: miura@da-cha.org (Hiroshi Miura), davej@suse.de, hpa@zytor.com,
       linux-kernel@vger.kernel.org
Subject: Re: workaround for Cyrix MediaGX/NSC Geode companion CS5510/5520 PIT latch bug
References: <20021017170344.0C87C11782A@triton2>
	<200210201719.g9KHJeC21138@devserv.devel.redhat.com>
From: Christer Weinigel <christer@weinigel.se>
Date: 20 Oct 2002 21:16:41 +0200
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Alan Cox <alan@redhat.com> writes:

> > with this patch, timejumps or timebacks don't occurs.
> > This patch also removes dodgy_tsc() workaround.
> > 
> > this patch tried on mini note-PC CASSIOPEIA FIVA http://www.casio.co.jp/mpc/103/
> > you can get spec from http://www.da-cha.org/fiva/fiva.html
> 
> Excellent. My wife has a 5520 based system and I can test it there too. Dave
> if Windows always generates that delayed sequence (which btw the docs say
> the delay is required...) it may explain the similar VIA weirdness

I have seen a similar problem with a Geode SC1200 based system which
basically is a GX1 and a CS5530 integrated on one chip.  I'm starting
to wonder if the same bug has popped up again in the newer chip.

Unfortunately, I haven't got access to the troublesome system anymore
so I can't test the patch.

  /Christer

-- 
"Just how much can I get away with and still go to heaven?"

Freelance consultant specializing in device driver programming for Linux 
Christer Weinigel <christer@weinigel.se>  http://www.weinigel.se
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