> Am 22.07.2015 um 08:52 schrieb Pavel Fedin <p.fe...@samsung.com>: > > Hello! > >>> I think the theory we discussed at the time of putting in the PCIe >>> device was that if we wanted this we'd add support for the other >>> PCIe memory window (which would then live at somewhere above 4GB). >>> Alex, can you remember what the idea was? >> >> Yes, pretty much. It would give us an upper bound to the amount of RAM >> that we're able to support, but at least we would be able to support big >> MMIO regions like for ivshmem. > > But i currently think that specification of "Generic PCI host" assumes only a > single MMIO region + single PIO region + single ECAM. And we cannot have two > MMIO regions without changing its specification, which can be problematic. Am > i wrong about this ?
At least on Seattle we do have several regions with that driver and I don't expect real hardware to provide a model as simple as ours. So yes, I would be very surprised if there were limitations about the split of regions. Alex > > Kind regards, > Pavel Fedin > Expert Engineer > Samsung Electronics Research center Russia > >
