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Re: [Qemu-devel] [PATCH v2 7/9] hw/vexpress.c: Instantiate the motherboa


From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH v2 7/9] hw/vexpress.c: Instantiate the motherboard CLCD
Date: Wed, 25 Jan 2012 19:28:36 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111220 Thunderbird/9.0

Am 24.01.2012 13:39, schrieb Peter Maydell:
> Instantiate the CLCD on the vexpress motherboard as well as one on
> the daughterboard -- the A15 daughterboard does not have a CLCD
> and so relies on the motherboard one.
> 
> At the moment QEMU doesn't provide infrastructure for selecting
> which display device gets to actually show graphics -- the first
> one registered is it. Fortunately this works for the major use
> case (Linux): if the daughterboard has a CLCD it will come first
> and be used, otherwise we fall back to the motherboard CLCD.
> So we don't (currently) need to implement the control register
> which allows software to tell the mux which video output to pass
> through to the outside world.
> 
> Signed-off-by: Peter Maydell <address@hidden>

Reviewed-by: Andreas Färber <address@hidden>

I do hope we find a solution to deal with n displays in the future. I
consider that a post-QOM topic and maybe Anthony's planned DisplayState
refactoring helps with that.

The Origen Board has (provisions for) an LCD in addition to HDMI output,
for instance.

Andreas

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