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

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Date:	Wed, 21 Feb 2007 13:24:24 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Udo van den Heuvel <udovdh@...all.nl>
Cc:	linux-kernel@...r.kernel.org,
	Alistair John Strachan <s0348365@....ed.ac.uk>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Subject: Re: PCI riser cards and PCI irq routing, etc

Udo van den Heuvel <udovdh@...all.nl> writes:

> So if my non-VIA riser card can use DN 19 and also INT_A things should work?

That INT_A may be INT_A from their (motherboard) point of view, but
the riser card doesn't know about that, it only knows INTs as seen
at its PCI edge connector (so this INT_A here is meaningless).

Device numbers aren't rotated but rather derived from address lines
(address/data). AD0-31 lines are the same across the whole PCI bus.
That means device numbers are independent of POV.

> (assuming that VIA Epia EN BIOS 1.07 is enough to use this card)

My VIA EPIA-M 600 is probably older than your one, so I'd assume
it should work as well.
When you configure 0x13 and 0x14, both devices get IRQs - that means
the BIOS can see both of them.

> The DN is the only variable so INT lines are hardwired on the riser card?

Yep. You just need a bit of soldering.
-- 
Krzysztof Halasa
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