IORESOURCE_UMA_FB question

[Aaron Durbin]

Hi corebooters,

I'm trying to understand the reason for the existence of
IORESOURCE_UMA_FB. Is this to allow one to carve out an uncacheable
MTRR region for the UMA framebuffer? If so, why was that ram added as
cacheable to begin with?

Thanks for the help. Full disclosure: I'd like to get rid of it and
handle these concepts in a different manner.

-Aaron