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

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Message-ID: <m3tzxfqoad.fsf@maximus.localdomain>
Date:	Wed, 21 Feb 2007 20:54:50 +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:

> Is the situation, with default DN setting of 19 as displayed below,
> `normal` w.r.t. interrupts?
> I mean: Both the DVB card with DN19 and the Unichrome Pro video adapter
> have the same irq although they are on different busses.

It's normal (and consistent with EPIA-M). The first UHCI USB (#0)
could get it, too (but it may be connected differently with IO-APIC,
I haven't checked).

> How can I find out what INT_A/B/C/D line is mapped to what irq?

That "INT_A/B/C/D" stuff depends on the point of view. In the BIOS
setup you can select some IRQs (which Linux could change anyway)
but it's a chipset-centric view (not very useful here).

Every PCI card have INT_A/B/C/D signals and they are (may be) remapped
on the riser card and on the motherboard.
-- 
Krzysztof Halasa
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