Looking for a robust and flexible POSIX/Unix-/Linux-like OS suitable for embedded applications.

I'm looking for a robust and flexible POSIX/Unix-/Linux-like operating system suitable for embedded applications.

In a Minecraft mod (OC2) for instance, RISC-V computers are introduced within the game I think. While capable of running Linux, it's very memory-intensive. So I need a straightforward embedded Unix-like OS that I can either adapt to RISC-V or one with existing RISC-V support. 🙏🙏
Solution
@Sterling furthermore FreeRTOS can be used with a POSIX wrapper. It has good support for RISC-V when it comes to resource-constrained environments. Even RTEMS , it's free and it has POSIX API support
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