I'm currently working on a bus_dma back-end for the Shark, and I have
some questions about it...

I know of the DMA range limitation for ISA.  However, I'm not clear on
whether or not the same limitation applies to the PCI bus on the system,
as well.  The `dma-ranges' property that notes the 4M range limitation
exists in the OFW's / node, and the `dma-ranges' properties for /vlbus,
/vlbus/isa, and /pci are different than /'s.

What's the scoop, here?  Is all DMA on the Shark limited by /'s
`dma-ranges' property, or does that apply only to ISA DMA?

Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                            Home: +1 408 866 1912
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