linux-kernel - Re: PCI riser cards and PCI irq routing, etc

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Message-ID: <20070221134656.GD22464@csclub.uwaterloo.ca>
Date:	Wed, 21 Feb 2007 08:46:56 -0500
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Krzysztof Halasa <khc@...waw.pl>
Cc:	Udo van den Heuvel <udovdh@...all.nl>, linux-kernel@...r.kernel.org
Subject: Re: PCI riser cards and PCI irq routing, etc

On Wed, Feb 21, 2007 at 01:11:12AM +0100, Krzysztof Halasa wrote:
> lsorense@...lub.uwaterloo.ca (Lennart Sorensen) writes:
> 
> > Via has a dual pci-ext card.  See EXT-PCI at
> > http://www.via.com.tw/en/products/mainboards/accessories.jsp
> 
> 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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