linux-kernel - Re: More info on port 80 symptoms on MCP51 machine.

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Date:	Sat, 15 Dec 2007 19:46:51 -0500
From:	"David P. Reed" <dpreed@...d.com>
To:	Allen Martin <AMartin@...dia.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Rene Herman <rene.herman@...il.com>,
	Pavel Machek <pavel@....cz>, Andi Kleen <andi@...stfloor.org>,
	"linux-os (Dick Johnson)" <linux-os@...logic.com>,
	David Newall <david@...idnewall.com>,
	Paul Rolland <rol@...917.net>,
	Krzysztof Halasa <khc@...waw.pl>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: More info on port 80 symptoms on MCP51 machine.

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.  
>
>   
This is very helpful.  So the next question is there something on the 
laptop mainboard.

Any idea how to look for such a thing?   I am not averse to taking the 
laptop apart to look at the mainboard.
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