| QEMU implements some PCI serial devices which are simple PCI |
| wrappers around one or more 16550 UARTs. |
| There is one single-port variant and two multiport-variants. Linux |
| guests work out-of-the box with all cards. There is a Windows inf file |
| (``docs/qemupciserial.inf``) to set up the cards in Windows guests. |
| IO bar, 8 bytes long, with the 16550 UART mapped to it. |
| ``pci-serial-2x``, ``pci-serial-4x`` |
| 1b36:0003 (``-2x``) and 1b36:0004 (``-4x``) |
| IO bar, with two or four 16550 UARTs mapped after each other. |
| The first is at offset 0, the second at offset 8, and so on. |