How can I access ENET_QOS PHY over MDIO bus on a 8MPLUSLPD4-EVK board

[mdanilau]

Hi,

i'm evaluating a 8MPLUSLPD4-EVK board and i would like to access ENET_QOS PHY (U23 in schematics) over MDIO bus. Unfortunately it looks like (s. p. 8 of official schematics) the MDIO bus is not default soldered to U23. I cannot solder this connection for i'm not allowed to change a reference board.

Is there a way to communicate with U23 over MDIO?

Regards

[JosephAtNXP · Accepted solution]

Hi,

Thank you for your interest in NXP Semiconductor products,

The mentioned missed connection is to use FEC MDIO bus, the default configuration is that FEC MDIO bus talks to FEC PHY @ 0x01 and EQOS MDIO bus talks to EQOS PHY @ 0x01.

Please run the below command in U-Boot to list the MDIO buses and locate the EQOS PHY.

=> mdio list

Regards