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Date: Sat, 15 Dec 2007 14:46:59 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Allen Martin <AMartin@nvidia.com>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>, Rene Herman <rene.herman@gmail.com>,
       "David P. Reed" <dpreed@reed.com>, Pavel Machek <pavel@ucw.cz>,
       Andi Kleen <andi@firstfloor.org>,
       "linux-os (Dick Johnson)" <linux-os@analogic.com>,
       David Newall <david@davidnewall.com>, Paul Rolland <rol@as2917.net>,
       Krzysztof Halasa <khc@pm.waw.pl>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
       rol@witbe.net
Subject: Re: More info on port 80 symptoms on MCP51 machine.
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Allen Martin wrote:
> 
> Nothing inside the chipset should be decoding port 80 writes.  It's 
> possible this board has a port 80 decoder wired onto the board that's 
> misbehaving.  I've seen other laptop boards with port 80 decoders
> wired onto the board, even if the 7 segment display is only populated
> on debug builds.  
> 
> We use PCI port 80 decoders internally for debugging quite often, so 
> if there were some chipset issue related to port 80 it would have 
> showed up a long time ago, and this is the first I've heard of
> hangs related to port 80 writes.
> 

Presumably you have programmable decoders to trigger SMI?  If not, then 
they're probably doing the equivalent in a SuperIO chip or similar.

	-hpa