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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> |
| Delivery-date: | Tue, 28 Aug 2007 06:46:40 -0700 |
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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.
/gary
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