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Re: [Xen-devel] [PATCH][QEMU] Fix ACPI COM port detection

To: Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][QEMU] Fix ACPI COM port detection
From: Gary Grebus <ggrebus@xxxxxxxxxxxxxxx>
Date: Tue, 28 Aug 2007 09:46:17 -0400
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Ben Guthro <bguthro@xxxxxxxxxxxxxxx>
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On Tue, 2007-08-28 at 12:57 +0100, Keir Fraser wrote:
> A bit of fiddling seems to indicate that dynamically presenting the UAR
> devices does actually make sense. Windows doesn't complain about all COM
> ports going missing in the same way that it does about all LPT ports going
> missing. And it does complain (albeit hidden in device manager and event
> viewer) if it sees a ACPI UAR device that it can't physically probe.

Those two complaints were what the patch was intended to address.

> > 
> > Also, PIIX4 is not hardcoded to 00:01.2, and if it moves then we have set
> > ourselves up here for a subtle bug.
> > 
True, but I don't know of any way around having the DSDT know at least a
little about the device model.


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