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Date: Wed, 12 Dec 2007 21:29:22 +0000
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Rene Herman <rene.herman@...il.com>,
"David P. Reed" <dpreed@...d.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.
> One wonders if it does some SMM trick to capture port 0x80 writes and
> attempt to haul them off for debugging; it almost sounds like some kind
> of debugging code got let out into the field.
Not implausible. We've got a bug I've been dealing with where a vendor
left debug stuff enabled via the parallel port and which clearly
"escaped" from the test environment to the BIOS proper.
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