How to manage 2 memory areas for offscreen allocations?

[Ian Romanick]

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Alberto Mardegan wrote:

> Hence, I have two pools for offscreen memory: the internal (and faster)
> 384KB and the external 2MB (less the visible framebuffer area).
> Since fbdev uses external memory, kdrive offscreen allocation routines
> take external memory into consideration.  The faster 384KB of faster
> internal memory are not used at all.

Conceptually, how is this different from PCs with on-card and AGP
memory?  It /sounds/ similar (of course you can't display from AGP, but
still), so you should be able to manage it similarly.  Have I missed
some important detail?
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