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EtherCAT master TODO
$Id$
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Version 1.4.0:
* Realtime interface changes:
- PDO configuration.
- SDO access.
- Replace process data pointers with offset.
- External memory for domains.
* Mailbox handler
* Read PDO mapping via CoE during bus scan.
* SDO write access in sysfs.
* Remove get_cycles() calls and references to cpu_khz to increase
portability.
* Remove ecdb.h and let lsec output PDO information 'cut-and-pastable' for
applications.
* Update documentation.
Future issues:
* Move slave handlers and state machines, etc. into a user space daemon.
- Step 1: Replace Sysfs interface with cdev and a user space program
to replace lsec.
- Step 2: Move kernel threads to user space daemon with a TCP interface
replacing the cdev.
* Distributed clocks.
* Redundancy with 2 network adapters.
* Support slaves, that don't support the LRW datagram, only LRD/LWR.
* PDO reading in IDLE mode.
* Interface/buffers for asynchronous domain IO.
Smaller issues:
* Datagram debugging flag.
* Clear sync managers in INIT.
* Simplify FSMs with <state>_enter() functions.
* Read out CRC counters.
* Calculate expected working counter for domains.
* Optimize alignment of process data.
* Evaluate EEPROM contents after writing.
* Configure slave ports to automatically open on link detection.
* Calculate cycle time of operation state machine.
* Locking for serveral slave variables for sysfs access.
* Interrupt master state machines state scan for other jobs.
* Master state machine, slave configuration: Do not check every slave on
a cycle.
* Only execute one EoE handler per EoE cycle.
Less important issues:
* Implement all EtherCAT datagram types.
* File access over EtherCAT (FoE).
* Allow VLAN tagging.
* Determine number of frames, the NIC can handle.
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