Re: ISA slot detection on PCI systems?

From: Vojtech Pavlik (
Date: Fri Jan 04 2002 - 14:21:51 EST

On Fri, Jan 04, 2002 at 02:05:38PM -0500, Eric S. Raymond wrote:
> Vojtech Pavlik <>:
> > 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.
> Yeah. That's what makes the lspci approach unusable for my purposes.
> The approach I want to take is this:
> 1. Get guaranteed access to the DMI data, either via a /{proc,sys}/dmi
> or /var/run/dmi initialized at boot time.
> 2. Develop an exception list of mobos that have ISA slots that don't
> show up under DMI.
> My logic would then be: if the box has PCI, and DMI shows no ISA slots,
> and the motherboard is not on the exception list, then suppress ISA
> questions.
> This would be a kluge, but it would have the advantage that the exception
> list is finite and can be expected to stop growing.

You'll have to add motherboards that have no ISA slots, but onboard ISA
devices to the list.

I'd suggest looking at the output of /proc/bus/isapnp as well, because
if it lists any devices, you certainly need ISA support.

Vojtech Pavlik
SuSE Labs
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