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Re: MI overrides of bus_dma(9), bus_space(9), pci(9)
On Thu, Mar 11, 2010 at 12:20:41PM -0800, Matt Thomas wrote:
> On Mar 11, 2010, at 11:40 AM, David Young wrote:
> > Resource management:
> > PCI-* bridges can override bus_space_alloc(9)/bus_space_free(9)
> > in order to (1) allocate space from the upstream bus, (2)
> > widen/narrow its I/O- or memory-space window. Then we can
> > provide a reliable rbus-like facility to detachable buses
> > through bus_space(9).
> bus_dma_subregion can be used for that. So bus_space_subregion.
How do we open the windows?
David Young OJC Technologies
dyoung%ojctech.com@localhost Urbana, IL * (217) 278-3933
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