FB model basic issues (WAS: radeon, apertures & memory mapping)

[Benjamin Herrenschmidt]

On Tue, 2005-03-15 at 16:00 +0200, Ville Syrjälä wrote:

> DirectFB has it's own asbitration mechanism. It doesn't support using 
> multiple framebuffer devices at the same time. For that to work DirectFB 
> would just have to know if some of the framebuffer devices are actually 
> different outputs of the same card so that it could associate both with 
> the same lock and accelerator state.
> 
> With the current system I don't see much chance of using accelerated fbcon 
> on one head and accelerated DirectFB (or something else) on the other.

Oh, I think that won't happen unless directFB maps it's arbitration
mecanism on top of the DRM lock and fbcon does that too.

BTW. Can you quickly explain me the DirectFB arbitration mecanism ?
We'll need to map it on top of the VGA arbiter _at_least_ ...

Ben.