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

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Message-ID: <m3abzb8a2f.fsf@maximus.localdomain>
Date:	Sun, 18 Feb 2007 21:50:16 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Udo van den Heuvel <udovdh@...all.nl>
Cc:	linux-kernel@...r.kernel.org,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Subject: Re: PCI riser cards and PCI irq routing, etc

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

> FYI: My situation is a VIA Epia EN12000 with a TranquilPC dual PCI riser
> where only the Device Number can be changed.

With jumpers?

> So IRQ 16 and 20. But when using the stock 2.6.20 kernel there is no
> communication with the DVB-T card (the frontend), so there is no
> /dev/dvb/* entry. This points to an IRQ problem.
>
> How can I find out the actual IRQ that the card is using?

I would remove the PCI cards and then the riser card and check INT
routing with a multimeter.
Perhaps a task for someone used to stuff like that.

> I set the BIOS for 'PnP OS installed'. Should I change that?

Most drivers already enable devices so it probably doesn't matter.
I would check it, though.
-- 
Krzysztof Halasa
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