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i.MX6UL Ethernet Driver

Question asked by TerryMcHenry on Mar 7, 2016
Latest reply on Mar 14, 2016 by Yuri Muhin

The Ethernet from Freescale states;


* The dual fec interfaces are not equivalent with enet-mac.

* Here are the differences:


* - fec0 supports MII & RMII modes while fec1 only supports RMII

* - fec0 acts as the 1588 time master while fec1 is slave

* - external phys can only be configured by fec0


* That is to say fec1 can not work independently. It only works

* when fec0 is working. The reason behind this design is that the

* second interface is added primarily for Switch mode.


* Because of the last point above, both phys are attached on fec

* mdio interface in board design, and need to be configured by

* fec0 mii_bus.


Does this means that 1588 timing synchronization can only be achieved from the ENET1 input?