[SeaBIOS] [PATCH] Support more than one vga card

Gerd Hoffmann kraxel at redhat.com
Wed May 4 19:14:28 CEST 2011


>>> But supporting multiple VGA cards is something we want anyway since I
>>> think Spice uses this to have multiple heads. Gerd?
>> The secondary qxl devices are a bit different.  They are not vga
>> compatible.  They register as generic display class device.  They have
>> no vga bios.  You need qxl guest drivers to drive them.
> As a curiosity, do you then need a normal vga device to see boot
> messages? How does it work before you load the drivers?

There are "qxl-vga" and "qxl" devices.  The first variant is vga 
compatible (i.e. has bios, has vga mode, grabs isa vga ports, shows boot 
screen, ...), the other isn't.  Once switched into native qxl mode there 
is no difference between those two devices.


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