radeon, apertures & memory mapping

[Jon Smirl]

On Sun, 13 Mar 2005 17:43:09 +1100, Benjamin Herrenschmidt
<benh at kernel.crashing.org> wrote:
> > In the long term I was hoping to design thing such that the two heads
> > can be used by two independent users, each could be running X or
> > fbdev.
> 
> You mean fbcon ? Unless there is proper arbitration, there can't be 2
> users. Hopefully we'll get there. But in any way, there can be only one
> driver in charge of the "card". That is, if X is using UseFBDev, then
> yes, it can use one head and fbcon the other. But if X is reprogramming
> the whole card, no way fbdev (and I mean -dev in this case) can use the
> other head at the same time, that's just not realistic.

I meant fbcon and XGL. Both will be running on fbdev/DRM and using a
coordinated memory manager, probably in DRM.

Current X is broken for sharing.

-- 
Jon Smirl
jonsmirl at gmail.com