Subject: Re: Another changer, another changer problem
To: Curt Sampson <>
From: Bill Studenmund <>
List: current-users
Date: 10/08/1998 20:53:24
On Thu, 8 Oct 1998, Curt Sampson wrote:

> Sorry, I'm working from the MindShare book that covers only up to
> PCI spec 2.1.

I too have that book. Let me know if you find something which covers later
revisions well. :-)

> Unfortunately, PCI doesn't have the concept of `slot numbers.' It
> appears to me that individual BIOSes map slots to devices in an
> arbitrary manner. So while slots, from left to right, might be
> devices 9, 10, 11 and 12 on one motherboard, on another they might
> be 10, 8, 11, 9.

Technically it's how the board maker wired the IDSEL lines. There's a
description around p322. Also see page 522 for how the VL82C59x handles
IDSEL (which is different then the spec's example quoted on p322!).

Take care,