From owner-freebsd-current Sat Sep 4 23:16:45 1999
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To: Mike Smith <mike@smith.net.au>
Cc: freebsd-current@freebsd.org
Subject: Re: PNP ids missing in sio.c
In-reply-to: Your message of "Sat, 04 Sep 1999 21:34:09 PDT."
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Date: Sat, 04 Sep 1999 23:10:17 -0700
From: Mike Smith <mike@smith.net.au>
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> > ummm... I thought that the plan was to disable all PnP devices, do the
> > legacy isa probes, and then reenable the PnP devices and probe them...
>
> The fact that a device is reported via PnP does not guarantee that you
> can disable it. Most of the "devices" reported by the PnP BIOS can
> neither be disabled nor moved.
>
> > that way you don't have the problem of legacy probes grabing a card...
>
> It doesn't avoid attempting to probe for a legacy device in a region
> where a fixed but PnP-known device exists.
I forgot to mention that it also doesn't deal with the case where a
legacy device exists but is not described by the kernel's static
metadata. There are several ways to work around this issue; in the ISA
case one should use the port availibility determination technique
described in the ISA PnP spec (or an equivalent) as well as the ESCD
information available from the PnP BIOS.
--
\\ The mind's the standard \\ Mike Smith
\\ of the man. \\ msmith@freebsd.org
\\ -- Joseph Merrick \\ msmith@cdrom.com
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