Re: I2O on sparc64 [Also on alpha] (Was: Re: mlx on sparc?)

[Martin Husemann <martin%duskware.de@localhost>]

On Sat, Sep 13, 2008 at 08:29:06PM -0600, Michael L. Hitch wrote:
>   I'm even less familiar with the sparc64 DMA, but I'm wondering the the 
> same type of thing is happening there (i.e., the DMA addressing is not 
> real physical memory, but mapped through DMA mappings).

DMA on sparc64 goes through the iommu, so bus addresses have usually no
similarity with neither kernel VA nor kernel PA. Not using
bus_dmamap_alloc/load would certainly guarantee the driver to not work on
sparc64.

Martin