Re: [Qemu-devel] [PATCH] Add an isa device for SGA

[Glauber de Oliveira Costa <gcosta@redhat.com>]

----- Original Message -----
> From: "Jan Kiszka" <jan.kiszka@web.de>
> To: "Glauber Costa" <glommer@redhat.com>
> Cc: kvm@vger.kernel.org, aliguori@us.ibm.com, mtosatti@redhat.com, qemu-devel@nongnu.org, avi@redhat.com
> Sent: Wednesday, May 11, 2011 5:00:10 PM
> Subject: Re: [PATCH] Add an isa device for SGA
> On 2011-05-11 19:11, Glauber Costa wrote:
> > This patch adds a dummy legacy ISA device whose responsibility is to
> > deploy sgabios, an option rom for a serial graphics adapter.
> > The proposal is that this device is always-on when -nographics,
> > but can otherwise be enable in any setup when -device sga is used.
> 
> That means bios output is written to the virtual uart? Sounds
> interesting. Where do we find such an option rom?

code.google.com/p/sgabios

Plan is to include it in the set of roms distributed by QEMU.

> Alternatively, what about adding serial console support to SeaBIOS?
> I've
> seen real BIOSes that allow driving both VGA and serial in parallel.
> That could be controlled via -boot and some fwcfg, just like we
> request
> the boot menu today.
Possible, cleaner, but much more work.

I think using sgabios give us what we need for very little additional cost.
If someone would be willing to do the work in SeaBIOS, that would be another story.

> 
> Jan