Sorry, I haven't been following this thread. At what point does the
machine lock up? Is it as soon as the MTRR region is setup, or later
(such as when you do graphics operations or change video modes)?
Perhaps the first/last few kBytes of the framebuffer have control
registers rather than display memory? In that case, write-combining
could foul up the card. You can fix this by making a uncacheable
region for the registers.
Regards,
Richard....
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