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How do I debug Ethernet on STM32F767?

I've got my own design STM32F767 boards and I've briefly had the Ethernet going but now it's stopped working and I don't know where to look. I'm using CubeMX to generate the application framework and the hardware is basically a clone of the Nucleo board so I'm using the LAN8742A-CZ on the RMII. When it was working I was running a sockets server and I could ping the board, so it looked pretty encouraging.

Any help with debug suggestions would be gratefully received.

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