Re: MMIO regions

[James Simmons <jsimmons@edgeglobal.com>]

> You seem to be looking for a solution which doesn't exist, though. :)

Well my next experiment is RTLinux with acceleration. From what I have
been learning SGI kernel has a special schedular for its graphics to
ensure hard real time performace. I want to see how much of a impact
RTLinux wil have with acceleration.    

> It is an unfortunate, but true, fact that the broken video hardware
> doesn't let you provide memory mapped access which is (a) fast, (b)
> totally safe, and (c) functional.  Choose which of a, b and c you are
> willing to sacrifice and then we can look for solutions.  DRI sacrifices
> (b), for example, by making the locking cooperative rather than
> compulsory.  The basic unaccelerated fbcon sacrifices (c).  Using VM
> protection would sacrifice (a).  It's not the ideal choice, sadly.

Well I see SGI uses usemsa which is its version of flocking. If SGI does
it then its the right way :) Yes I think SGI hardware is teh greatest in
the world.

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