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Date: Tue, 21 Nov 2000 20:08:43 +0100 (MET)
From: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
cc: Johannes Erdfelt <johannes@erdfelt.com>,
        Ingo Molnar <mingo@chiara.elte.hu>, linux-kernel@vger.kernel.org
Subject: Re: Linux 2.4.0test11-ac1
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Organization: Technical University of Gdansk
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On Tue, 21 Nov 2000, Alan Cox wrote:

> Quite a few dual pentium socket 7 boards report dual cpu and apic in the 
> MP table regardless of the capabilities of the CPU installed. Its apparently
> legal to do so. There is an apic capability flag that should be tested before

 It's not legal -- the MPS is very explicit the MP-table must reflect a
real configuration. 

> making any assumptions about APIC availability on a processor.

 OK, but how does it handle the 82489DX?  There are valid configurations
using this kind of APIC, including Pentium P54C ones...

> And yes some boards crash otherwise.

 Hmm, the only solution I can see is to check the APIC version in the
MP-table and only if an integrated version is reported then check
capabilities.  But can we trust the version reported given that amount of
brokenness out there? 

  Maciej

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

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