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Date: Sun, 24 Feb 2002 23:08:55 +0100
From: Vojtech Pavlik <vojtech@suse.cz>
To: Paul Mackerras <paulus@samba.org>
Cc: Vojtech Pavlik <vojtech@suse.cz>, Troy Benjegerdes <hozer@drgw.net>,
        Martin Dalecki <dalecki@evision-ventures.com>,
        Linus Torvalds <torvalds@transmeta.com>,
        Andre Hedrick <andre@linuxdiskcert.org>,
        Rik van Riel <riel@conectiva.com.br>,
        Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Flash Back -- kernel 2.1.111
Message-ID: <20020224230855.A2199@ucw.cz>
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In-Reply-To: <15481.25374.253992.643727@argo.ozlabs.ibm.com>; from paulus@samba.org on Mon, Feb 25, 2002 at 09:03:10AM +1100
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On Mon, Feb 25, 2002 at 09:03:10AM +1100, Paul Mackerras wrote:
> Vojtech Pavlik writes:
> 
> > > 83 MHz     55 MHz          41 MHz    0111 1101
> > 
> > This one is a problem, because 41*2 != 55. However, this is also illegal
> > according to the PCI spec.
> 
> Where does the PCI spec say that is illegal?

Well, I'm assuming the 41 MHz clocked bus is not a 66-MHz type PCI bus
(doesn't have the 66 MHz bit set and can't operate at 20.5 MHz if you
plug in a card that can't do 66 MHz operation), rather it's an
overclocked 33 MHz bus.

And running PCI over 33 MHz isn't legal in the PCI spec as far as I
know. You can go lower, but I think the limit is 16 MHz there.

-- 
Vojtech Pavlik
SuSE Labs
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