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EtherCAT master TODO

$Id$

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* Future features:
  - Distributed clocks.
  - Redundancy with 2 network adapters.
  - Mailbox handler
  - Support slaves, that don't support the LRW datagram, only LRD/LWR.
  - PDO reading in IDLE mode.
  - Replace Sysfs interface with cdev and user space program.
  - Interface/buffers for asynchronous domain IO.

* Smaller issues:
  - Datagram debugging flag.
  - Clear sync managers in INIT.
  - Simplify FSMs with <state>_enter() functions.
  - Output intermediate results during lsec.
  - Read out CRC counters.
  - Calculate expected working counter for domains.
  - Optimize alignment of process data.
  - Evaluate EEPROM contents after writing.
  - SDO write access in sysfs.
  - Configure slave ports to automatically open on link detection.
  - Calculate cycle time of operation state machine.
  - Locking for serveral slave variables for sysfs access.
  - Interrupt master state machines state scan for other jobs.
  - Master state machine, slave configuration: Do not check every slave on
    a cycle.
  - Only execute one EoE handler per EoE cycle.

* 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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