On Thu, Mar 17, 2005 at 10:08:15AM +0100, Geert Uytterhoeven wrote:

On Thu, 17 Mar 2005, Ville [iso-8859-1] Syrj??wrote:

quoted

On Thu, Mar 17, 2005 at 12:12:58PM +1100, Benjamin Herrenschmidt wrote:

quoted

quoted

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.

Really?

Really.

I was always given Matrox as an example of a card that would lock up if
you access the frame buffer while the accelerator is busy...

Apparently they didn't know what they were talking about.

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