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EtherCAT master TODO

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$Id$

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Version 1.4.0:

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* Remove self_configured flag to avoid unnecessary process data

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  interruptions.

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* Replace Sysfs interface with cdev and a user space program

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  to replace lsec; move a few sysfs attributes to proc.

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* Implement realtime interface via cdev.

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* Make scanning and configuration run parallel (each).

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* Mailbox state machine using toggle bits.

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* Mailbox protocol handlers.

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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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* Update documentation.

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* Supply new ec_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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* READMEs for examples.

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* Separate Pdo and Pdo entry classes.

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* Attach Pdo names.

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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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* Add something like lsec -n to show numeric vendor IDs.

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* Remove the end state of the master state machine.

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* Rename the sdodict state to sdo_dictionary.

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* Check the position of the acknowledge state.

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* Remove the xmldev files.

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* Remove some debugging (add_sync_manager, clearing station addresses).

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* Separate CoE debugging.

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* Make ecrt_master_slave_config() return no error when slave is not present

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  or invalid.

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Future issues:

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* Distributed clocks.

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

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  kernel threads to user space daemon with a TCP interface replacing the

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  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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