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EtherCAT master TODO

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$Id$

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Future issues:

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* Distributed clocks.

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* Implement user space realtime interface via cdev.

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* Move master threads, slave handlers and state machines into a user

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  space daemon.

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* Allow master requesting when in ORPHANED phase

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* Mailbox protocol handlers.

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* Mailbox state machine using toggle bits.

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* Mailbox gateway.

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* Separate CoE debugging.

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* Evaluate EEPROM contents after writing.

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* Optimize alignment of process data.

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* Redundancy with 2 network adapters.

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* Interface/buffers for asynchronous domain IO.

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* Make scanning and configuration run parallel (each).

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* File access over EtherCAT (FoE).

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* Vendor-specific over EtherCAT (VoE).

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* ethercat tool:

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    - Data type abbreviations.

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    - Add a -n (numeric) switch.

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	- Check for unwanted options.

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* Segmented SDO downloads.

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Smaller issues:

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* Stop master thread at ecrt_master_request() to get rid of allow_* flags?

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

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* Clear sync managers in INIT.

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* Read out CRC counters.

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* Configure slave ports to automatically open on link detection.

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* Only execute one EoE handler per EoE cycle.

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* Fix datagram errors on application loading/unloading.

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Less important issues:

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* Allow VLAN tagging.

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* Determine number of frames, the NIC can handle.

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