and the SPI lines for the flash aren’t even broken out from the module. It looks like whatever boot ROM the ESP32 has inside it is testing for a high voltage on GPIO 12. Don’t ask us.

In particular, ESP-Hosted-NG his turns your SPI- or SDIO-connected ESP32 (including -S2/S3/C2/C3/C6 into a WiFi card, quite speedy and natively supported by the Linux network stack, as opposed to ...

We made something similar but using the RP2350A board, the Raspberry Pi Pico 2, and published a guide on how to get Wi-Fi on the Pico 2 using an ESP32 ... two I2C and two SPI connections.