new radeon memory map fixes

[Marcin 'Morgoth' Kurek]

Hell[o] Benjamin,

On 2006-01-26, you wrote:

> Please, report any problem,

Both applied and generaly I can start Xserver with dri enabled fine. But the
glxgerars cause heavy desktop corruption here (Blinking window borders, etc.
I can supply a screenshoot if required) 

It seems this happend only with XAA when I switch to EXA works fine. 

My setup is Pegasos II machine with G4 CPU and Radeon 9000 card.

Regards
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