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Re: [Qemu-ppc] VGA cirrus patch prevents video output

From: David Gibson
Subject: Re: [Qemu-ppc] VGA cirrus patch prevents video output
Date: Fri, 6 Jul 2018 13:18:49 +1000
User-agent: Mutt/1.10.0 (2018-05-17)

On Thu, Jul 05, 2018 at 10:41:43PM -0400, Programmingkid wrote:
> I noticed that the video in QEMU stopped working. When I start 
> qemu-system-ppc all I see is a black window. Not even OpenBIOS displays 
> anything. After some bisecting I found out it was this patch that causes the 
> problem: 
> Commit 29f9cef39eb1ae55e82c6763eb22d7a1bdff7276
> Author: Sebastian Bauer <address@hidden>
> Date:   Mon Jul 2 21:13:45 2018 +0200
>     ppc: Include vga cirrus card into the compiling process
>     Drivers for this card exists on PPC-based AmigaOS guests so it is useful 
> to
>     allow users to emulate the graphics card for PPC machines.
>     As cirrus vga is currently preferred over std(vga) in absence of any user
>     choice, this change also sets the default display of spapr machines to
>     std as otherwise qemu refuses to start these machines. Not specifying an
>     explicit graphics mode is for instance done by 'make check'.
>     Signed-off-by: Sebastian Bauer <address@hidden>
>     Signed-off-by: David Gibson <address@hidden>
> I think a solution to this problem might be to have the mac99
> machine use "-vga std" as default. When I use -vga std, video works
> again.

There are already patches in the works to fix this.

David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!

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