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

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Date:	Wed, 21 Feb 2007 15:59:51 +0100
From:	Udo van den Heuvel <udovdh@...all.nl>
To:	linux-kernel@...r.kernel.org
CC:	Krzysztof Halasa <khc@...waw.pl>,
	Alistair John Strachan <s0348365@....ed.ac.uk>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Subject: Re: PCI riser cards and PCI irq routing, etc

Krzysztof Halasa wrote:
> 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.

But the IRQ for the DVB-T card doesn't work.
I would need to test the DVB-T card alone to be sure it has working IRQ.
If so, what would be the conclusion?

>> The DN is the only variable so INT lines are hardwired on the riser card?
> 
> Yep. You just need a bit of soldering.

What IRQ rerouting would I need to try? 1 of 3 choices?
Or one best bet?

Udo
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