Re: MI overrides of bus_dma(9), bus_space(9), pci(9)

[David Young <dyoung%pobox.com@localhost>]

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.

Matt,

How do we open the windows?

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933