Development Notes

PHY Detection

If an invalid PHY is detected via registers, as on some SoC + board combinations, we should recognize this and skip initializing the network.

Invalid:

ETH:   Searching for valid PHY
ETH:   Found PHY 0:0x0-0x0
ETH:   SPEED:0, DUPLEX:0

Valid:

ETH:   Searching for valid PHY
ETH:   Found PHY 0:0x0-0x128
ETH:   SPEED:2, DUPLEX:2

reference: