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

[Ville Syrjälä]

On Thu, Mar 17, 2005 at 12:12:58PM +1100, Benjamin Herrenschmidt wrote:
> 
> > I understand you can't have userspace program the accelerator while 
> > someone else is doing the same thing. Oh and I now understand that the 
> > same really applies to direct framebuffer access due to the swapper.  
> 
> And you can't have someone program the accelerator while somebody does
> direct access neither. It's basically all exclusive.

I haven't seen that happen on any hardware I own. Matrox specs explicitly 
mention that there is no need to synchronize accelerator and direct 
framebuffer access.

-- 
Ville Syrjälä
syrjala at sci.fi
http://www.sci.fi/~syrjala/