Re: ISA slot detection on PCI systems?

From: Vojtech Pavlik (
Date: Fri Jan 04 2002 - 14:04:10 EST

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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