linux-kernel - Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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Date:	Tue, 1 Jan 2008 17:38:41 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"David P. Reed" <dpreed@...d.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Rene Herman <rene.herman@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Rolland <rol@...917.net>,
	Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol@...be.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

> 80 diagnostic codes and sending them to the "drawer" management 
> processor through a management backplane.   This is a little puzzling, 
> because you'd think they would have noticed port 80 issues, since they 
> run Linux in their systems.  Maybe not hangs, but it seems unhelpful to 

Most of the chipsets let you turn it on and off so presumably the BIOS
turns it off before running Linux. Thats certainly done by several
chipsets and we recently had a bug where a BIOS forgot to turn them off
which confused someones parallel port devices.

> Anyone know if the Linux kernels used on blade servers have been patched 
> to not do the port 80 things?  I don't think this would break anything 

I'm not aware of such, or requests for them.

Alan
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