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Date:      Mon, 03 Apr 2000 09:11:10 -0600
From:      Warner Losh <imp@village.org>
To:        Nikolai Saoukh <nms@otdel-1.org>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: Reserving Resources 
Message-ID:  <200004031511.JAA61348@harmony.village.org>
In-Reply-To: Your message of "Mon, 03 Apr 2000 19:07:41 %2B0400." <20000403190741.A55382@Draculina.otdel-1.org> 
References:  <20000403190741.A55382@Draculina.otdel-1.org>  <20000403104318.A53697@Draculina.otdel-1.org> <Pine.BSF.4.20.0004022113120.604-100000@localhost> <200004022029.OAA54341@harmony.village.org> <20000403104318.A53697@Draculina.otdel-1.org> <200004031430.IAA60992@harmony.village.org> 

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In message <20000403190741.A55382@Draculina.otdel-1.org> Nikolai Saoukh writes:
: On Mon, Apr 03, 2000 at 08:30:08AM -0600, Warner Losh wrote:
: 
: > : I do not like the idea of resource consumation. Is there a
: > : description of the problems which might arose without it?
: > 
: > Machine deadlock, undetected irq conflict causing misbehavior, probing 
: > hardware for device foo and locking the machine because device bar is
: > really there.
: 
: Disaster can happens with legacy hardware. ;-(
: What is wrong with PNP?

You can't always disable PNP devices.  More accurately, the devices
reported by PNPBIOS are defined to be hard wired and always active.
You cannot turn them off or relocate their resources.  They likely
should be probed first rather than last like they are now, with
changes made to those drivers taht don't yet support PNP.  However,
since the isa bus isn't guaranteed to exist until later in the boot
process, this may have some problems.

Warner


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