From owner-cvs-all  Wed May 26  9:36:45 1999
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From: Steve Kargl <sgk@troutmask.apl.washington.edu>
Message-Id: <199905261638.JAA97006@troutmask.apl.washington.edu>
Subject: Re: cvs commit: src/sys/conf options
In-Reply-To: <199905261554.JAA02293@harmony.village.org> from Warner Losh at "May 26, 1999 09:54:17 am"
To: imp@harmony.village.org (Warner Losh)
Date: Wed, 26 May 1999 09:38:22 -0700 (PDT)
Cc: mike@smith.net.au (Mike Smith),
	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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Warner Losh wrote:
> In message <199905261555.IAA87427@troutmask.apl.washington.edu> Steve Kargl writes:
> : The sysctl varaibles become:
> : 
> : hw.bus.pci0 = "82440FX"
> : hw.bus.pci1 = NULL
> : hw.bus.isa0 = "82371SB"
> : hw.bus.isa1 = NULL
> 
> You might want to look at the DEVICE_SYSCTLS kernel option.  It does
> something similar.  I'm not sure if it is intended for "production"
> use or not, but it sure is handy for debugging.
> 

DEVICE_SYSCTLS is not documented in LINT, so I would suspect
that it isn't meant for "production" use.

If I understand Roger and Mike's requirement, they need to
know chipset/bus information that must be available before their
device drivers are probed.  The question seems to be whether
to store the information or reprobe the chipset/bus for each
device.   Sysctl seems (to me) to be a natural solution to 
the problem  The only possible exception is whether number
of possible busses to enumerate is large.


-- 
Steve


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