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

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Date:	Wed, 12 Dec 2007 13:05:33 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rene Herman <rene.herman@...il.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"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.

Rene Herman wrote:
> On 12-12-07 21:26, Rene Herman wrote:
> 
>> On 12-12-07 21:07, David P. Reed wrote:
> 
>>> Someone might have an in to nVidia to clarify this, since I don't.  
>>> In any case, the udelay(2) approach seems to be a safe fix for this 
>>> machine.
> 
> By the way, _does_ anyone have a contact at nVidia who could clarify? 
> Alan maybe? I'm quite curious what they did...
> 
> Summary:
> 
> Unless after booting with "acpi=off", outputs to port 0x80 (the legacy 
> way to delay I/O) reliably, but not immediately, hang MCP51 machines. 
> Outputs to port 0xed do not indicating it's a not a generic bus abort 
> problem.
> 

Sorry, the first sentence didn't parse unambiguously for me.  Do you 
mean "acpi=off" works, or that "acpi=off" allows *subsequent* boots to work?

I have some people at nVidia I can probably ping.

	-hpa
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