1.Does required a PCIe device specific probe?
2.A doorbell interrupt to the Endpoint is raised though the AXIPCIE_DMA0.DMA_CHANNEL_AXI_INTERRUPT_ASSERT[axi_software_interrupt] register and wait for an acknowledgment from the Endpoint.
3.On reception of an acknowledgment (interrupt or polling based), PIO transfers to write to a BAR mapped space are started and read back for verification.