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Date: Sun, 1 Dec 1996 06:40:02 -0800 (PST)
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From: se@freebsd.org (Stefan Esser)
Subject: Re: conf/2130: Installation bug
Reply-To: se@freebsd.org (Stefan Esser)
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The following reply was made to PR conf/2130; it has been noted by GNATS.

From: se@freebsd.org (Stefan Esser)
To: pgiffuni@fps.biblos.unal.edu.co
Cc: freebsd-gnats-submit@freebsd.org
Subject: Re: conf/2130: Installation bug
Date: Sun, 1 Dec 1996 15:27:14 +0100

 On Nov 30, pgiffuni@fps.biblos.unal.edu.co wrote:
 > 
 > >Number:         2130
 > >Category:       conf
 > >Synopsis:       Installation bug
 > >Description:
 > No PCI support can be removed before installing the OS!
 
 This is the way it is uspposed to be ...
 
 We could add a DISABLE function to the config 
 code, which would directly write some bit in 
 the PCI device's config space command register.
 
 This would completely deactivate the device 
 (except for config space accesses) and the PCI
 code could respect this bit (while it currently
 tries hard to gat all devices activated that 
 the PCI BIOS might have forgotten, for example
 behind a PCI to PCI bridge ...)
 
 I'm not sure there are really good applications 
 for a ONE time dactivate of a PCI device. And 
 the PCI code assumes that all devices are auto-
 configuring. And for that reason, a device might
 be found at a different address (and even in a 
 different 'slot') on each reboot without violating 
 the specs. (This will happen, if you add cards with
 PCI to PCI bridges and bus. Then, even the bus 
 number of previously installed devices may come 
 out differently ...)
 
 Regards, STefan