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Date: Wed, 5 Mar 2003 01:46:56 +0300
From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>, raarts@office.netland.nl,
       david.knierim@tekelec.com, alexander@netintact.se,
       Donald Becker <becker@scyld.com>, Greg KH <greg@kroah.com>,
       jamal <hadi@cyberus.ca>, Jeff Garzik <jgarzik@pobox.com>,
       kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org,
       Robert Olsson <Robert.Olsson@data.slu.se>
Subject: Re: PCI init issues
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References: <20030304212648.A6455@jurassic.park.msu.ru> <Pine.LNX.4.44.0303041046370.1426-100000@home.transmeta.com>
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On Tue, Mar 04, 2003 at 10:54:21AM -0800, Linus Torvalds wrote:
> Well, I'd say it looks like the MP table _claims_ that only pin0 is 
> connected. Remember: the claim was that this machine worked on WinXP.

It seems that "IRQ redirection table" is gathered directly from
IO_APIC hardware (I may be wrong though), and it conforms to other
data...

> So there are at least two potential reasons for that:
> 
>  - The MP table is simply wrong, and WinXP gets the routing information 
>    from somewhere else (ie most likely ACPI)
> 
>  - The MP table is right, and only pin0 is connected, and WinXP only uses 
>    pin0 (ie it puts the card in some state where all irqs are shared 
>    across all of the four tulip chips).
> 
> Maybe somebody can come up with other schenarios.

  - XP is able to reprogramm the IO_APIC so that all four pins are
    routed properly.

Sounds a bit heretical, I know. :-)

Ivan.
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