On Sat, 2017-08-19 at 10:47 -0500, Bjorn Helgaas wrote: > So if ARM64 doesn't have these PCI legacy resources, does that mean an > ARM64 host bridge cannot generate these legacy addresses on PCI? That > is, there's no host bridge window that maps to those PCI addresses? > That seems like a curious restriction on host bridges, but I guess it > would be possible. It's rather common. For example on POWER8: - There is no IO space at all - We configure the 32-bit MMIO window to be around 3..4G (to avoid overlapping with DMA space below it). So we effectively have no path to the legacy areas, and that hasn't been a problem so far. Cheers, Ben.
