Cheetah_Firmware/REPLACE esp_eth_mac_w5500.c...

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IMPORTANT: If you're using ESP-IDF v4.3.0 or older, you need to replade the file components/esp_eth/src/esp_eth_mac_w5500.c with the one in this repository.
It contains patches for SPI communication. WIthout these, once the link is up, unplugging the ethernet cable will cause the program to crash.