On our new custom carrier board I have connected the RMII port to a Micrel/Microchip KSZ8863RLL 3 port ethernet switch - Using the 2nd Ethernet documentations as reference.
The VF50 is configured for DHCP, but ends up with an internally assigned IP address as it cannot get a network connection through the KSZ8863.
From other posts it seems that others have had issues with the MDC/MDIO interface that allows management of the device at the other end of the RMII interface - When looking at the MDC and MDIO lines with a logic analyzer I can see the MDC beeing active for aprox. 1 second (780 kHz) but with no data on the MDIO apart from one slow fall and rise that looks like noise to me.
I have loaded the registry changes for activating the 2nd RMII port and the second ethernet icon shows up in the WEC 6 GUI.
I have checked the GPIO settings with Vybrid GPIO V1.2 and found that the RMII interface has indeed been activated with MDC on GPIO 71 and MDIO on GPIO 98 (BL_ON has been moved to GPIO 106).
The KSZ8863RLL chip is working on the 2 other ports allowing a connection through the switch.
Any suggestions on how to investigate from here would be much appreciated.