RE: [Xen-devel] beginnings of allowing more than the basic 80x25 VGAscreen resolution

["Ling, Xiaofeng" <xiaofeng.ling@xxxxxxxxx>]

Is it possible to add some real mode code to xen  like video.S in linux kernel 
to switch mode?
If dom0 can support vesa frame buffer driver, not only we can get 
more line in text console, but also we can use other application 
that can use frame buffer driver like SDL library. 
So a vmx guest graphic device model can run without X server.


Keir Fraser <> wrote:
> On 4 Jul 2005, at 09:00, Jan Beulich wrote:
> 
>> As far as I know, not only the VGA driver does not do any mode
>> switching, even the VESA one doesn't (because the protected mode
>> interface doesn't cover the mode switching functions as far as I
>> remember). Only the video board specific frame buffer drivers are
>> able to switch modes, and the bad thing (for me personally) is that
>> even in 
>> 2.6.12 there still is no (64-bit) support for the i915 chipset. So I
>> continue to be required to live with the video mode that XEN 'sets'
>> prior to loading dom0, and short of it supporting a VESA console my
>> first minimal attempt was to at least increase (and propagate) the
>> size to the maximum possible without significant changes.
> 
> That's a pain. Maybe we can find a simple example somewhere of
> setting video mode via protect-mode VBE calls. I see that this
> functionality is missing from the kernel drivers -- it's all done in
> a monstrous real-mode assembly file. Any video card we care about
> these days should support VBE 2.0/3.0 I think, and those interfaces
> don;t require you to be runnign in real mode.     
> 
>   -- Keir
> 
> 
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