CMRX

Microkernel RTOS providing full memory isolation for Cortex-M and RISC-V microcontrollers without an MMU.

PlatformWebfree

CMRX is a free, open-source microkernel real-time operating system that provides full memory isolation between userspace processes on MMU-less Cortex-M and RISC-V microcontrollers, with a roughly 13 kB flash footprint. It organizes user code into isolated processes with automatic memory-protection management and a POSIX-like threading API. It is built for embedded firmware engineers who want memory isolation as a default, non-negotiable feature rather than an optional complexity.

Website

Full match profile

Behind the summary, Matchbox keeps a richer profile of CMRX - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

Claim CMRX to unlock →

Try Matchbox with your own problem

Describe what is not working - we’ll show you whether CMRX (or something else) actually fits.

Try a problem