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-What: /sys/kernel/debug/olpc-ec/cmd
-Date: Dec 2011
-KernelVersion: 3.4
-A generic interface for executing OLPC Embedded Controller commands and
-reading their responses.
-To execute a command, write data with the format: CC:N A A A A
-CC is the (hex) command, N is the count of expected reply bytes, and A A A A
-are optional (hex) arguments.
-To read the response (if any), read from the generic node after executing
-a command. Hex reply bytes will be returned, *whether or not* they came from
-the immediately previous command.