ESP32-S31: 320MHz 2C RV32IMAFCP+CLIC, 512KB SRAM, GbE, 802.11ax, 61 GPIO

I'm puzzled by Espressif's naming here. We had the ESP32-S3, so "S31" sounds like "S3, variant 1," but this part doesn't really look like a simple S3 variant. And then there's an ESP32-E22, but no E21 or even a plain E2 anywhere.

Edit: found an article explaining some of their naming logic, and said that the SoC naming will get its follow-up article, but sadly it never happened. https://developer.espressif.com/blog/2025/03/espressif-part-...

I don’t trust Espressif’s releases, I am still waiting for ESP32-P4 to hit distributors. It is now more than 2 years and 3rd chip revision

Does it run Linux?

They claim that the chip has an "MMU". But unfortunately this doesn't seem to be a true RISC-V MMU (according to the Sv32 specification) integrated into the CPU core itself, but just a peripheral designed for memory mapped SPI flash and PSRAM. So as far as I understand there is no true process isolation with page faults and dynamic paging.

I believe this is the first ESP to gain Ethernet capability?

I totally wish that a board would come with PoE…

Because as it is right now, powering a fleet of those with USB power supplies is annoying as fsck…

How do Espressif’s RISC-V cores compare to existing ARM or RISC-V options in terms of power efficiency (computational power / electrical power)?

I hope this one has multiple radios so you can actually use BT/Wifi/Thread simultaneously.

The ESP32 boards I own have bad support and are a bit of a hit and miss. (arduino nano esp32) Did this get better? Or is the support still messy?

Is there something that match those elsewhere ?

Roughly how much do you think this costs?