How to correctly connect CopyEngine PCI device to an ARM system?

[sammy17]

I am trying to connect the CopyEngine device to an ARM bigLITTLE system (by editing configs/example/arm/dist_bigLITTLE.py).

I tried to connect it like this:

dev4 = CopyEngine(ChanCnt=1)
dev4.sid = 0x28
system.attach_pci(dev4)
system.copyengine = dev4

Note that I have defined system.copyengine in RealView.py so it is not the issue.

With this configuration, I am getting below error when I try to start the simulation:
src/dev/dma_device.cc:163: panic: panic condition !dmaPort.isConnected() occurred: DMA port of system.copyengine not connected to anything!

I see that a very similar issue is filed here, but I could not find a solution anywhere.

Is this a bug? If not, what is the correct way to connect the DmaPort of the CopyEngine to the system?

Some additional things I tried:

I observed that the CopyEngine device is defined as below:

class CopyEngine(PciDevice):
    type = "CopyEngine"
    cxx_header = "dev/pci/copy_engine.hh"
    cxx_class = "gem5::CopyEngine"
    dma = VectorRequestPort("Copy engine DMA port")
    VendorID = 0x8086
    DeviceID = 0x1A38
    Revision = 0xA2  # CM2 stepping (newest listed)
    SubsystemID = 0
    SubsystemVendorID = 0
    Status = 0x0000
    SubClassCode = 0x08
    ClassCode = 0x80
    ProgIF = 0x00
    MaximumLatency = 0x00
    MinimumGrant = 0xFF
    InterruptLine = 0x20
    InterruptPin = 0x01
    ...

I observed that the dma is defined as a VectorRequestPort.
Therefore, I tried connecting the CopyEngine.dma[0] port manually to the PCI host.
But I still got the same error with this configuration.

I would really appreciate any help on this.