On Mon, Dec 07, 2015 at 02:05:14PM +0200, Marcel Apfelbaum wrote:
PCIe downstream ports (Root Ports and switches Downstream Ports) appear to firmware as PCI-PCI bridges and a 4K IO space is allocated for them even if there is no device behind them requesting IO space, all that for hotplug purpose.
However, PCIe devices can work without IO, so there is no need to allocate IO space for hotplug.
Thanks. Applied.
-Kevin