[PATCH v2 05/27] arm: pci: add a align_resource hook

[Arnd Bergmann]

On Wednesday 30 January 2013, Jason Gunthorpe wrote:
> > But we normally only assign a 64 KB I/O window to each PCI host bridge.
> > Requiring PCI bridges to be space 64 KB apart would mean that we cannot
> > actually support bridges at all.
> 
> The PCI resource code uses full 32 bit integers when it handles IO
> addresses, so this actually does sort of work out.

However, we only reserve 1 MB (I think) virtual address window for all
I/O spaces of all PCI domains combined, at a fixed location (0xfee00000).
This means we can have at most 16 such windows at run-time. That can
be changed if necessary, but it seems like overkill when in practice
you only need a few bytes at most.

	Arnd