schedule() other processes while waiting in ec_master_sync_io().
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EtherCAT master TODO
$Id$
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* Release 1.2:
- Find bug causing slow unloading after topology change.
- Introduce topology_change_pending.
- Update feature lists.
* Release 1.3:
- Remove ecrt_master_run(). "Inject" FSM commands instead.
- Implement new addressing scheme (without "X:Y").
- Implement tool to set aliases.
- Remove ugly ec_slave_is_coupler().
- Add statistics object.
- SDO dictionary and -access in operation mode.
- SDO write access in Sysfs.
- Speed up IDLE-FSM through fast mode with schedule().
* Implement e100 driver.
* Implement distributed clocks.
* Read dynamic PDO mapping from SDO dictionary (see can-cia.org: cia301ds4).
* Implement redundancy with 2 network adapters.
* Implement interface for alternative PDO mapping.
* Simplify FSMs with <state>_enter() functions.
* Make ec_sync_config() and ec_fmmu_config() to methods of ec_slave_t.
* Rename "sysconfig" file to "sysconfig/ethercat".
* Dynamic creation of EoE handlers.
* Output intermediate results during lsec.
* State change FSM: Follow spontaneous state changes.
* 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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