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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <47645963.9060202@zytor.com>
Date:	Sat, 15 Dec 2007 14:46:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Allen Martin <AMartin@...dia.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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.

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/