On Mar 11, 2010, at 12:31 PM, David Young wrote: > 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?
I don't see a reason to do that but you could allocate new larger subregions from the parent.
