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

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Message-ID: <4762FE3E.5020402@redhat.com>
Date:	Fri, 14 Dec 2007 17:05:50 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Rene Herman <rene.herman@...il.com>,
	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.

On 12/12/2007 04:05 PM, H. Peter Anvin wrote:
> 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.
> 

Have them search on Google for:

  hp tx1000 noapic

:)
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