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On a PCI type HV uart, the bdf value is in a union together with mmio_base_vaddr, then the value would be overridden by mmio_base_addr in uart16550_init(), result in is_pci_dbg_uart() returns a wrong value and then uart hang. Tracked-On: #5288 Signed-off-by: Victor Sun <victor.sun@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>