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EtherCAT master TODO

$Id$

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Version 1.4.0:

* Remove get_cycles() calls and references to cpu_khz to increase
  portability.
* Make scanning and configuration run parallel (each).
* Adapt remaining examples.
* READMEs for examples.
* Update documentation.
* Check for sizes of uploaded Sdos when reading mapping from CoE.
* Attach Pdo names from SII or Coe dictioary to Pdos read via CoE.
* Remove the end state of the master state machine.
* Add a -n (numeric) switch to ethercat command.

Future issues:

* Distributed clocks.
* Move master threads, slave handlers and state machines into a user
  space daemon.
* Implement user space realtime interface via cdev.
* Mailbox protocol handlers.
* Mailbox state machine using toggle bits.
* Mailbox gateway.
* Separate CoE debugging.
* Evaluate EEPROM contents after writing.
* Optimize alignment of process data.
* Wait for bus scanning, even when link is not up at ecrt_request_master()?
* Redundancy with 2 network adapters.
* Interface/buffers for asynchronous domain IO.

Smaller issues:

* Evaluate SII Size field (0x003E) to determine maximum SII memory size.
* Unite fsm_pdo_mapping, fsm_pdo_config and fsm_coe_map.
* Clear sync managers in INIT.
* Read out CRC counters.
* Configure slave ports to automatically open on link detection.
* Only execute one EoE handler per EoE cycle.

Less important issues:

* File access over EtherCAT (FoE).
* Allow VLAN tagging.
* Determine number of frames, the NIC can handle.

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