From owner-cvs-all  Wed May 26  8:52:59 1999
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From: Steve Kargl <sgk@troutmask.apl.washington.edu>
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Subject: Re: cvs commit: src/sys/conf options
In-Reply-To: <199905261515.IAA03133@dingo.cdrom.com> from Mike Smith at "May 26, 1999 08:15:44 am"
To: mike@smith.net.au (Mike Smith)
Date: Wed, 26 May 1999 08:55:06 -0700 (PDT)
Cc: roger@cs.strath.ac.uk (Roger Hardiman),
	nick.hibma@jrc.it (Nick Hibma), roger@FreeBSD.ORG (Roger Hardiman),
	cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
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Mike Smith wrote:
> > Nick 
> > 
> > > Are the Brooktree cards the only bus master cards that suffer from
> > > this problem?
> > 
> > While on the subject, I want the bt848 driver to read the
> > PCI Host chipset ID and select the 'compatibility' mode
> > automatically. (Just like the Windows and Linux drivers do)
> > 
> > But I've no idea how to do this.
> 
> It's actually annoyingly hard to perform a PCI bus enumeration from 
> within a driver; I need to do this for the AGP driver that I'm trying 
> to write as well.  I think you're going to have to scan the entire list 
> of connected PCI devices manually, at least in 2.x and 3.x systems.  
> Under new-bus in 4.x it ought to be possible to query your parent bus 
> controller(s) to find out what they are.
> 

Is it posible to add sysctl variables that are set as the 
various busses are probed?  Then, one could iterate over the
sysctl variables.

From my dmesg:

pcib0: <PCI host bus adapter> on motherboard
pci0: <PCI bus> on pcib0
chip0: <Intel 82440FX (Natoma) PCI and memory controller> at device 0.0 on pci0
isab0: <Intel 82371SB PCI to ISA bridge> at device 7.0 on pci0

The sysctl varaibles become:

hw.bus.pci0 = "82440FX"
hw.bus.pci1 = NULL
hw.bus.isa0 = "82371SB"
hw.bus.isa1 = NULL

-- 
Steve


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