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Date: Fri, 4 Jan 2002 20:04:10 +0100
From: Vojtech Pavlik <vojtech@suse.cz>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, esr@thyrsus.com,
        David Woodhouse <dwmw2@infradead.org>, Dave Jones <davej@suse.de>,
        Lionel Bouton <Lionel.Bouton@free.fr>,
        Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: Re: ISA slot detection on PCI systems?
Message-ID: <20020104200410.E21887@suse.cz>
In-Reply-To: <20020103133454.A17280@suse.cz> <Pine.GSO.3.96.1020104191141.829B-100000@delta.ds2.pg.gda.pl>
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In-Reply-To: <Pine.GSO.3.96.1020104191141.829B-100000@delta.ds2.pg.gda.pl>; from macro@ds2.pg.gda.pl on Fri, Jan 04, 2002 at 07:28:58PM +0100
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On Fri, Jan 04, 2002 at 07:28:58PM +0100, Maciej W. Rozycki wrote:

> > > Thats why I also suggested using lspci and looking for an ISA bridge.
> > > If you have no PCI its probably ISA. If you have no PCI/ISA bridge its
> > > very very unlikely to be ISA
> > 
> > Uh, no. Almost all 486 PCI boards and early Pentium/K5/K6 boards have
> > the PCI bus hanging of the VLB or other local bus, and on those ISA
> > isn't behind an ISA bridge. These chipsets do have ISA but no ISA
> > bridge.
> 
>  These can be checked for explicitly as the list isn't likely to grow.  I
> can dig a few Intel docs for IDs of 486-class PCI chipsets that have no
> PCI-ISA bridge if they'd be useful.
> 
>  Also note that there are PCI-ISA bridges that are reported as "non-VGA
> unclassified" devices as they predate PCI 2.0.  The SIO (82378IB/ZB) comes
> to mind here.  The bridge is used in certain models of Alpha systems as
> well.  The bridges would need to be listed by IDs, too. 

And of course, there will be a huge amount of false positives, because
all the new chipsets have an ISA bridge built into the southbridge chip
and it is there even when no ISA slots are present.

-- 
Vojtech Pavlik
SuSE Labs
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