From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
From: "Stephen J. Bevan" <stephen@dino.dnsalias.com>
Message-ID: <m3bsbtc12s.fsf@dino.dnsalias.com>
Content-Transfer-Encoding: 7BIT
References: <0fa9a1a48b551903e12d530998e96205@plan9.bell-labs.com>
Subject: Re: [9fans] PCI vs. VPC
Date: Tue,  7 May 2002 12:05:09 +0000
Topicbox-Message-UUID: 8b27b1dc-eaca-11e9-9e20-41e7f4b1d025

jmk@plan9.bell-labs.com writes:
> My first suspect would be that the PCI configuration ports are not
> being emulated. Windows and Linux use the BIOS to retrieve PCI configuration
> space information, Plan 9 does it raw.

Linux can do it raw or via the BIOS.  The default is to do it raw even
if there is a BIOS.  However, if a raw probe for configuration types 1
or 2 fails, it falls back to using the BIOS.  This fallback can be
disabled by booting Linux with "nobios".