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Oh, it can. I've run ucLinux (MMU-less Linux) on an LPC1788 (Cortex-M3) and it works...okay. Making dynamic libraries work correctly on it is a pain in the ass. It just wasn't worth it at the end and the O/S hogged up most of the processor, RAM, and Flash.

Exactly. I think these end up as good PoCs - and it would be amazing to think of a future where we can run one of the Linux derivatives on a something that was designed with FreeRTOS or equivalent in mind - but it's just not going to happen on a commercial scale in my opinion.

ARM Linux isn't really slimming down, so the chips need to grow to catch up.

You're starting to see devices like the Renesas RZ/A1H that has 10MiB of SDRAM on the die and can boot Linux out of a single cheap QSPI memory part.

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