Subject: Re: [DmaMapping] Questions
To: Manuel Bouyer <email@example.com>
From: Chris G. Demetriou <firstname.lastname@example.org>
Date: 06/20/2000 09:14:07
email@example.com (Manuel Bouyer) writes:
> On an alpha or with more than 4G of RAM these ops
> will probably copy the DMA buffer when needed (i.e. if it lives in a regions
> > 4G).
actually, most alphas worth their salt have (basically) virtual DMA,
where you can map on a page-by-page basis which locations in RAM will
be accessed by dma accesses to certain regions of bus space.
these are used on alpha to implement most bounce buffers, for