Download the latest firmware
https://github.com/scottalford75/Remora-RP2040-W5500/tree/main/firmware
Upload the remora-rp2040-2.0.0.uf2 file to your pico.
To configure the linuxcnc hal module and configs use the files here:
Hal Files (run halcompile on these) https://github.com/scottalford75/Remora-RT1052-cpp/tree/main/LinuxCNC/components/Remora-eth
and the configs: https://github.com/scottalford75/Remora-RP2040-W5500/tree/main/LinuxCNC/Configs/remora-rp2040
Ensure you can ping the remora ethernet, the ip shoud be 10.10.10.10
This command is useful to see the state of the port
sudo ethtool eth0
If you are using dupont wires the spi bus speed may be too high, you can change it here: https://github.com/scottalford75/Remora-RP2040-W5500/blob/main/port/ioLibrary_Driver/src/w5x00_spi.c#L141
spi_init(SPI_PORT, 50000 * 1000);