It looks like you can even run Rust on a small BluePill board featuring an STM32F103C8T6 ARM Cortex M3 with a modest 64 Kbytes of Flash memory and only 20 Kbytes of SRAM:
https://github.com/TeXitoi/blue-pill-quickstart
I think the boards I used for http://yager.io/vumeter/vu.html had even less memory, like 8kbytes of SRAM or something. Rust wasted a few kB on error reporting functions, iirc, but other than that everything fit without too much effort as long as I didn't try to include soft-float emulation or something.
wyager|5 years ago