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EtherCAT master TODO

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$Id$

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Version 1.4.0:

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* Slave config allow flag and completion object.

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* Mailbox state machine using toggle bits.

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* Mailbox protocol handlers.

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* READMEs for examples.

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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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* SDO write access in sysfs.

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* Distributed clocks.

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* Update documentation.

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* Do not configure in ecrt_master_activate(), but later in the state machine.

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* Remove master_state_t.

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* Scanning of Sdo dictionary / writing EEPROM in OPERATION state.

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* Adapt remaining examples.

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* Separate Pdo and Pdo entry classes.

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* Attach Pdo names.

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* Make all define underscores the same.

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* Remove bus validation; make bus scanning possible at any time.

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* Re-design slave configuration FSM, avoid unnecessary process data

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  interruptions.

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* Wait for bus scanning, even when link is not up at ecrt_request_master().

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* Implement ecrt_slave_config_state().

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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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* Mailbox gateway.

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* Slave-to-slave communication.

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* Redundancy with 2 network adapters.

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* Interface/buffers for asynchronous domain IO.

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Smaller issues:

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* Evaluate SII Size field (0x003E) to determine maximum SII memory size.

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* Unite fsm_pdo_mapping, fsm_pdo_config and fsm_coe_map.

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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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* 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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* 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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* 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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