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

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Message-Id: <200702212355.25601.s0348365@sms.ed.ac.uk>
Date:	Wed, 21 Feb 2007 23:55:25 +0000
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Cc:	Krzysztof Halasa <khc@...waw.pl>,
	Udo van den Heuvel <udovdh@...all.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: PCI riser cards and PCI irq routing, etc

On Wednesday 21 February 2007 22:40, Lennart Sorensen wrote:
> On Wed, Feb 21, 2007 at 10:35:05PM +0100, Krzysztof Halasa wrote:
> > Do you mean both slots on the riser card? No, they have to be rotated.
> >
> > Given the table from the manual:
> > > The IRQ (interrupt request line) are hardware lines over which devices
> > > can send interrupt signals to the microprocessor. The ??PCI & LAN?? IRQ
> > > pins are typically connected to the PCI bus INT A# ~ INT D# pins as
> > > follows: Order 1		Order 2 	Order 3 	Order 4
> > > PCI Slot 1	INT B# 		INT C# 		INT D# 		INT A#
> > > IEEE1394 	INT B#
> >
> > (I assume Order 1 is device's INT A and so on)
> > the chipset-centric view is:
>
> Well someone said the VIA uses INTA for the DN19 on their riser card,
> although is that INTA from the CPUs point of view or INTA from the slot
> the riser card is plugged into?  There was also mention of a BIOS update
> needed on some boards to even support the riser card at all.  Maybe that
> applies.

It applies on the M10000, I'm sure the newer EN series boards have always 
supported the feature.

One warning to you though, I found the riser to be pretty flaky, causing 
bizarre lockups and periodic crashes of Linux. Maybe this is a Linux bug, but 
it really didn't seem like it.

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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