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-rw-r--r--Documentation/mainboard/lenovo/t4xx_series.md14
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diff --git a/Documentation/mainboard/lenovo/t4xx_series.md b/Documentation/mainboard/lenovo/t4xx_series.md
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--- a/Documentation/mainboard/lenovo/t4xx_series.md
+++ b/Documentation/mainboard/lenovo/t4xx_series.md
@@ -18,3 +18,17 @@ the whole device.
* Unplug the power cable
* Remove the bottom enclosure
* Flip the mainboard and remove the main frame
+
+## Docking stations
+The following docking stations are supported by coreboot:
+* Type 2505
+ * VGA, Ethernet, Modem, PS2, 4 USB Ports
+ * Dock ID on pc87382 reads as: 2
+* Type 2504
+ * Serial, LPT, LEDs, Audio, DVI, VGA, Ethernet, Modem, PS2, 4 USB Ports
+ * Dock ID on pc87382 reads as: 1
+ * PNP IO address of SuperIO pc87384: 0x2e
+
+There's no hotplug support for LPT and Serial on Type 2504.
+
+The Dock ID reads as 7 if no dock is connected.