Consider you have a PCIe card that's not enumerated (like reprogramming it JTAG). When you cat the device, you get all ones for all registers

$ cat /proc/datadev_0 
-------------- Axi Version ----------------
     Firmware Version : 0xffffffff
           ScratchPad : 0xffffffff
        Up Time Count : 4294967295
             Fd Value : 0xffffffffffffffff
            Device ID : 0xffffffff
             Git Hash : ffffffffffffffffffffffffffffffffffffffff
            DNA Value : 0xffffffffffffffffffffffffffffffff

Could you add an error check in the "rogue.hardware.axi.AxiMemMap()" and "rogue.hardware.axi.AxiStreamDma()" that check for one of the registers being all ones? Maybe check if UpTimeCount = 0xFFFFFFFF = 4294967295 seconds = 136.2 years