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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