Date: Wed, 12 Dec 2007 21:29:22 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: 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.
Message-ID: <20071212212922.2cf5339b@the-village.bc.nu>
In-Reply-To: <47604EA4.50504@zytor.com>
References: <475DE6F4.80702@zytor.com>
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	<20071211084059.3d03e11d@tux.DEF.witbe.net>
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	<475E7DC2.4060509@davidnewall.com>
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	<475E95A3.3070801@davidnewall.com>
	<Pine.LNX.4.61.0712111024060.22976@chaos.analogic.com>
	<20071211163017.GD16750@one.firstfloor.org>
	<475EBFBA.6090301@keyaccess.nl>
	<20071211191649.GB3437@elf.ucw.cz>
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	<47603F66.3070108@reed.com>
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	<20071212210143.48721a41@the-village.bc.nu>
	<47604EA4.50504@zytor.com>
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> 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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