On Mon, Nov 30, 2020 at 04:11:42PM -0500, Jim Quinlan wrote: > Whereas most PCIe HW returns 0xffffffff on illegal accesses and the like, > by default Broadcom's STB PCIe controller effects an abort. This simple > handler determines if the PCIe controller was the cause of the abort and if > so, prints out diagnostic info. What happens during enumeration? pci_bus_generic_read_dev_vendor_id() assumes a read of Vendor ID returns 0xffffffff if the device doesn't exist. I assume this case doesn't cause the abort you're referring to here, or nothing would work. I think this enumeration case results in PCIe Unsupported Request errors (PCIe r5.0, sec 2.3.2 implementation note). Bjorn
