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-rw-r--r--docs/specs/pci-serial.txt34
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+
+QEMU pci serial devices
+=======================
+
+There is one single-port variant and two muliport-variants. Linux
+guests out-of-the box with all cards. There is a Windows inf file
+(docs/qemupciserial.inf) to setup the single-port card in Windows
+guests.
+
+
+single-port card
+----------------
+
+Name: pci-serial
+PCI ID: 1b36:0002
+
+PCI Region 0:
+ IO bar, 8 bytes long, with the 16550 uart mapped to it.
+ Interrupt is wired to pin A.
+
+
+multiport cards
+---------------
+
+Name: pci-serial-2x
+PCI ID: 1b36:0003
+
+Name: pci-serial-4x
+PCI ID: 1b36:0004
+
+PCI Region 0:
+ IO bar, with two/four 16550 uart mapped after each other.
+ The first is at offset 0, second at offset 8, ...
+ Interrupt is wired to pin A.