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Looks like there's a huge difference between small Linux and something like Contiki. Any time you run out of on-chip SRAM without an MMU (e.g. anything really low power) Linux is not a good fit. That non-Linux space is gigantic and there's room for something like Contiki as well as much lighter systems that have some form of non-IP networking. We evaluated a bunch of small kernels (ended up with uc/OS) but there are dozens of open and proprietary kernels that fit specific needs both larger and smaller than Contiki that are non-Linux for good reasons.



Yeah, uClinux is what i'm used to for MMU-less platforms. Then there's RTOSes, where you're looking at VxWorks/QNX/LynxOS for commercial support, or RTLinux/FreeRTOS/ChronOS for something unsupported. The Raspberry is a neat platform with plenty of uses, but custom tailored electronics often have exotic hardware with unique software constraints.




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