Re: [uml-devel] UML and fbdev

[Antonio Vargas <wind@cocodriloo.com>]

On Wed, Aug 13, 2003 at 06:07:29PM +0200, Geert Uytterhoeven wrote:
> 	Hi,
> 
> Are you aware of anyone working on frame buffer devices for UML?
> 
> I was thinking about creating a frame buffer device that displays as an X
> window. Making it work for user space applications can be tricky, because
> writes to the frame buffer must be trapped to update the screen (or use
> periodic update, or a combination). But it should work fine for text consoles
> (fbcon) and virtual terminals, and for debugging multi-head support.

What about using the "page was changed" bit at the page level?
Changing any byte on a framebuffer page would trigger an update
on the changed bit, and then a periodic task could read these bits
and make a list of pages to be sent over.

For an example about this technique, this was used on AmigaOS
for MacOS framebuffer emulation on shapeshifter.
 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> P.S. Please CC me, as I'm not (yet) subscribed to user-mode-linux-devel.
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
> 
> 
> 
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-- 
winden/network

1. Dado un programa, siempre tiene al menos un fallo.
2. Dadas varias lineas de codigo, siempre se pueden acortar a menos lineas.
3. Por induccion, todos los programas se pueden
   reducir a una linea que no funciona.


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