The documentation states:

> Compliant with RISC-V Sv32 virtual memory scheme

https://documentation.espressif.com/esp32-s31_datasheet_en.p...

Ok, I see. The S3’s "MMU" is just an external-memory mapper, not a virtual-memory MMU. The S31 apparently has both, that mapper plus an architectural CPU-side Sv32 MMU; that offers indeed a lot of interesting possibilities.