ESP32 Forum

So currently the esp32-c6, c61 and c5 only have an SDIO slave driver, the P4 only has an SDIO host driver and the classical esp32 has both.

I'd like to know whether this is only a software side omission and in particular whether SDIO slave support would be possible on the P4 or whether the necessary hardware is missing?

If the P4 had an SDIO slave controller, I imagine Espressif would likely mention it in the "Features" section of the datasheet alongside the "SD/MMC Host Controller (SDHOST)".

I tend to agree that this is probably a hardware limitation rather than a missing feature in ESP-IDF.