Linux on a Espressif chip? Yes, it finally happened
The engineers at Espressif have pulled off a stunt that feels like forcing a professional athlete into a toddler's onesie: they actually got Linux running on the ESP32-S31 without needing an emulator.
The new ESP32-S31 isn't your average microcontroller upgrade. By incorporating two RISC-V cores capable of hitting 320 MHz and adding Sv32 virtual memory support, this chip effectively grew up overnight. It now features three privilege levels—Machine, Supervisor, and User—allowing the kernel to finally stop pretending it's just a simple task scheduler and start acting like a real operating system.
The current Developer Preview build leans on Buildroot 2025.02, OpenSBI, and U-Boot to keep the lights on. Once the system finishes its boot sequence, it drops the user into a BusyBox shell using a CramFS file system. For those who enjoy suffering through complex build processes, there is also experimental support for Yocto/OpenEmbedded.
While this is technically an impressive feat, don't throw your Raspberry Pi in the trash just yet. The chip is limited to a mere few dozen megabytes of PSRAM, making it a tight squeeze for anything beyond basic tasks. It essentially turns a tiny, inexpensive sensor controller into a very confused, very underpowered mini-server.
Seeing a full OS crammed into a chip that costs less than a fancy coffee is the peak of modern tech hubris. It begs the question: are we innovating by making tiny things smart, or just wasting electricity for the sake of saying we could?
Source: Espressif GitHub
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