Hey, i see a problem sometimes which is "couldn't get PHY for P4080DS_MDIO0 addr0 failed to connect" error. and ethernet not working at all. is it logical to make loopback test in processor and how?
Ethernet PHY supports loopback mode. For example see the VSC8244 Data Sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/VMDS-10108.pdf
The P4080 SERDES does not support loopback mode.
Have a great day,
Pavel Chubakov
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