Re: ISA slot detection on PCI systems?

Vojtech Pavlik
2002-01-04T19:04:39Z

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