Re: PCI riser cards and PCI irq routing, etc

From: Lennart Sorensen
Date: Wed Feb 21 2007 - 14:56:28 EST

On Wed, Feb 21, 2007 at 01:11:12AM +0100, Krzysztof Halasa wrote:
> lsorense@xxxxxxxxxxxxxxxxxxx (Lennart Sorensen) writes:
> > Via has a dual pci-ext card. See EXT-PCI at
> >
> Right, and they say it's compatible with "EPIA mini-ITX family".
> That means the mappings I just outlined should apply to all of them.
> BTW: any "universal" dual+ PCI riser card have to use a PCI bridge
> chip, and a bridge isn't a small 20 pin IC (I'd expect 144 pins or
> so). "Active" or "passive" - doesn't matter.
> --

Certainly. The system I work with (which is not via based) has a PCI to
PCI bridge, which is 208pins (it supports 10 bus master loads behind it).
A cheap riser card that just does device number tricks will only work
on boards designed to use a riser card done that particular way.

Len Sorensen
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