Re: [Linux-fbdev-devel] UML and fbdev

[Jon Smirl <jonsmirl@yahoo.com>]

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I have a patch for UML (from April so it is out of
date) that will allow you to run any device driver
from inside UML. This patch makes it very easy to
debug things like the framebuffer driver since you can
use a normal debugger on them.

It works by dedicating the piece of hardware to UML
use. You don't load any drivers for it in the host OS.
Instead I have a small driver in the host that
forwards interrupts to UML using signals. The main
driver loads in UML and completely controls the
hardware from there. It supports interrupts, mem
mapping, DMA, etc.

I was using it to debug DRM drivers.

I tired to get it merged into UML without sucess.

--- Geert Uytterhoeven <geert@linux-m68k.org> 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.
> 
> 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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=====
Jon Smirl
jonsmirl@yahoo.com

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