I would like to be able to ask Linux for a 24bit bus address, for example.
I don't care where it is mapped in kernel space, as long as the output from
virt_to_bus gives me something with the high bits cleared.
Things are more confusing when the system board DMA controllers are used.
It is at this point where I am lost. Perhaps if I use a DMA controller
I should be asking *it* for memory and not linux?
> I don't really see why you would want to specify that the region
> returned needed to be <nMB except for the DMA limit.
Various boards have different DMA limits. PCI devices may be limited to
1meg, or 4Gig in a 64bit system. The GFP_DMA bit is getting overloaded,
and it seems to me that just adding more GFP_DMA bits is an exploding
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