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Comment by volemo | Hacker News Reader

That’s a shame, it’d be a cool and, afaik, unique feature for this niche.

Maybe Espressif will notice that there are no RV32 chips with MMU so far (at least to my knowledge); we only have 32 bit MCUs or then only 64 bits for the CPUs. Something like Cortex-A7 is missing.

There’s one incoming, https://baochip.github.io/baochip-1x/ It would be great to see more.

Baochip looks very interesting, and I highly respect bunnie's work, but I can't realistically say Baochip is a viable option for me, an unprofessional tinkerer.

The upcoming Baochip is an RV32 chip with an MMU, I believe.

https://www.bunniestudios.com/blog/2026/baochip-1x-a-mostly-...

Edit - Oops GeorgeHahn beat me to it

Does anyone know what CPU this uses? Is it their own first party design?

Not sure I understand your question, but the ESP32-S3[1] is the "CPU" here.

ESP32-S31 (very different from the S3)

That's literally and exactly what I said.

To be fair to GP, I too was confused by your use of brackets here.

I wasn't trying to be obtuse.

Formal grammar / technical documentation style guides consistently define:

[ ... ] = optional

{ ... } = repetition

| = alternatives

Hacker news isn't a formal grammar specification though. People use [1] for references here too (which you could easily have forgotten).

That's the SoC. The CPU is a small part of it. For example they could be using an open source design like the CVA6, or a commercial design from someone like Andes.

Espressif has a designed-in-house RISC-V CPU, so far as I know.

> Not sure I understand your question

I'm not sure why you are not sure - S3 was using Cadence's Xtensa 32-bit LX7 dual-core microprocessor, but the article on S31 only mentions "dual core" without too much detail.

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