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  What:		/sys/kernel/debug/olpc-ec/cmd
  Date:		Dec 2011
  KernelVersion:	3.4
  Contact:	devel@lists.laptop.org
  Description:
  
  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.