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+
+Accessing the EC space
+======================
+
+The ACPI implementation uses the standard I/O ports 0x62 and 0x66 to access the
+EC functionality. Accesses to these ports must be directed to the LPC bus to
+which the EC is connected.
+
+
+Interfacing with the ASL files
+==============================
+
+The mainboard code must define several variables for the ASL files.
+
+* EC_SCI
+ Defines the General Purpose Event (GPE) corresponding to the EC's SCI line.
+* EC_ACPI_LID_SWITCH_OBJECT
+ Defines the APCI object which reads the state of the lid, with 0 = open, and
+ 1 = closed. This is usually the bit which reads the GPIO input corresponding
+ to the lid switch.
+* PNOT()
+ The mainboard must define a PNOT method to handle power state notifications
+ and Notify CPU device objects to re-evaluate their _PPC and _CST tables.