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EtherCAT master TODO

$Id$

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* Release 1.3:
  - Remove addressing scheme "X:Y".
  - Remove ugly ec_slave_is_coupler().
  - Replace Vendor ID and product code arguments of ec_domain_register_pdo()
    by slave pointer.
  - Reset topology_change_pending on successful validation.
  - Dynamic creation of EoE handlers.

* Future features:
  - Interface/buffers for asynchronous domain IO.
  - Distributed clocks.
  - Read dynamic PDO mapping from SDO dictionary (see can-cia.org: cia301ds4).
  - Redundancy with 2 network adapters.

* Smaller issues:
  - Clear sync managers in INIT.
  - Simplify FSMs with <state>_enter() functions.
  - Output intermediate results during lsec.
  - State change FSM: Follow spontaneous state changes.
  - Read out CRC counters.
  - Calculate expected working counter for domains.
  - Optimize alignment of process data.
  - Evaluate EEPROM contents after writing.
  - SDO dictionary and -access in operation mode.
  - SDO write access in sysfs.
  - Speed up IDLE state machine through fast mode with schedule().

* Less important issues:
  - Implement all EtherCAT datagram types.
  - File access over EtherCAT (FoE).
  - Allow VLAN tagging.
  - Determine number of frames the NIC can handle.

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