Hi,
While running EtherCAT app in ICE, connect over JTAG to Cortex-A8 and open memory window.
Open loation 0x4a332480 (PRU-ICSS MDIO user access0 register). Refer to AM335x TRM, 14.5.10.11 MDIOUSERACCESS0 Register for more details
Write 0x80A1_0000 to read Auto-Negotiation Link Partner Ability Register (ANLPAR) (BASE Page), address 0x0005
Can you please report LSW (16-bit) from the same register after writing. This reports the register contents of the PHY.
Is there any option to force auto negotiation for a port of junction box?