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EtherCAT master TODO

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$Id$

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Version 1.4.0:

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* Realtime interface changes:

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    - PDO configuration.

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    - SDO access.

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    - Replace process data pointers with offset.

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    - External memory for domains.

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* Mailbox handler

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* Read PDO mapping via CoE during bus scan.

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* SDO write access in sysfs.

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* Remove get_cycles() calls and references to cpu_khz to increase

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  portability.

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* Remove ecdb.h and let lsec output PDO information 'cut-and-pastable' for

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  applications.

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* Update documentation.

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Future issues:

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* Move slave handlers and state machines, etc. into a user space daemon.

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    - Step 1: Replace Sysfs interface with cdev and a user space program

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              to replace lsec.

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    - Step 2: Move kernel threads to user space daemon with a TCP interface

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              replacing the cdev.

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* Distributed clocks.

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* Redundancy with 2 network adapters.

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* Support slaves, that don't support the LRW datagram, only LRD/LWR.

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* PDO reading in IDLE mode.

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* Interface/buffers for asynchronous domain IO.

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Smaller issues:

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* Datagram debugging flag.

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* Clear sync managers in INIT.

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* Simplify FSMs with <state>_enter() functions.

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* Read out CRC counters.

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* Calculate expected working counter for domains.

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* Optimize alignment of process data.

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* Evaluate EEPROM contents after writing.

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* Configure slave ports to automatically open on link detection.

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* Calculate cycle time of operation state machine.

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* Locking for serveral slave variables for sysfs access.

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* Interrupt master state machines state scan for other jobs.

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* Master state machine, slave configuration: Do not check every slave on

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  a cycle.

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* Only execute one EoE handler per EoE cycle.

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Less important issues:

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* Implement all EtherCAT datagram types.

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* File access over EtherCAT (FoE).

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* Allow VLAN tagging.

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* Determine number of frames, the NIC can handle.

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