@WiFive, OK for ESP8266 = 8089 die with SDIO. But the ESP32 has nothing in common. The ESP8266 is way to slow to replace a real WiFi interface. 4.9 chapter of the ESP32 datasheet states that the SDIO is HOST. So I don't see how I may reverse the clock either... I'm quite sure someone will implement ...

Hello, Is it possible to use the ESP32 as a slave to another CPU having an RMII interface ? The 50MHz clock is specified as output and I didn't find any feature to return the interface behavior. I would avoid an Ethernet switch just to connect an ESP32 and a Linux. ( we just need the ESP32 to forwar...