Re: kern/51231: Detect PCI mode from BIOS if exists

[coypu%SDF.ORG@localhost]

The following reply was made to PR kern/51231; it has been noted by GNATS.

From: coypu%SDF.ORG@localhost
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/51231: Detect PCI mode from BIOS if exists
Date: Tue, 28 Jun 2016 06:19:04 +0000

 jakllsch's PCI mode 2 machine (a 586) is reporting as mode 1 in BIOS.
 
 PCI mode 2 only exists in machines from PCI 1.0 introduction to PCI 2.0
 introduction (1992-1993 roughly).
 We don't know of any problems in detecting mode for older machines, so
 maybe use a year test, and anything a good bit newer is definitely PCI
 mode 1.
 
 Alternate idea: test existence of SMBIOS (introduced 1999). if it exists
 - assume mode 1.
 
 
 Side note: we have an ACPI blacklist year 2000 which checks SMBIOS
 (introduced 1999), it's probably not too useful.