[Dri-devel] Pseudo DMA?

[Jose F. <j_r...@ya...>]

I'm in the process of gathering all the interesting information on the
Utah-GLX project to the FAQ. 

Their glossary (http://utah-glx.sourceforge.net/faq.html#AEN364) gives
the definition of PIO, DMA and Pseudo DMA.

The PIO definition presented there raises no polemics but I don't see
what's different between Pseudo DMA and plain DMA. (It seems that their
concept of plain DMA is in fact MMIO since no reference to MMIO is given
there.)

Could someone of the 3D gurus enlighten this question? More
specifically, what is "pseudo DMA" and what is the relationship between
DMA and the PIO and MMIO modes?

Regards,

Jose Fonseca