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RetroBSD: Unix for microcontrollers
source link: https://www.tuicool.com/articles/hit/ra2iInE
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Small resource requirements. RetroBSD needs only 128 kbytes of RAM to be up and running user applications.
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Memory protection. Kernel memory is fully protected from user application using hardware mechanisms.
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Open functionality. Usually, user application is fixed in Flash memory - but in case of RetroBSD, any number of applications could be placed into SD card, and run as required.
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Real multitasking. Standard POSIX API is implemented (fork, exec, wait4 etc).
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Development system on-board. It is possible to have C compiler in the system, and to recompile the user application (or the whole operating system) when needed.
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