On Oct 21, 2008, at 9:55 AM, Jerry Van Baren wrote:
Wolfgang Denk wrote:
Dear Kumar Gala, In message <1224598531-2698-1-git-send-email-galak@kernel.crashing.org
you wrote: PCI bus is inherently 64-bit. We should treat all PCI related bus addresses as 64-bit quanities. This allows us to have the ability to support devices or memory on the PCI bus above the 32-bit boundary.
I don't think this is a good idea. There are pure 32 bit systems out there which will never use more than 32 bit for the PCI resources, so why load them with the additional memory size and execution time? Should we not enable this only for such systems that actually need it? Best regards, Wolfgang Denk
Why would we not use phys_addr_t and phys_size_t for the PCI addresses?
Because they aren't coupled. I can reasonable want 64-bit PCI accessible on a pure 32-bit system.
If we want to do this we should introduce a pci_addr_t/pci_size_t.
- k