Does anyone see value in running the Linux kernel on a RISC-V processor without an MMU?
Is your claim that "big" nommu processors/socs shouldn't exist at all? Or that you should run them bare-metal?
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I don't understand the market well enough to make such a bold claim but yes I would question a large SoC without MMU
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One model I've seen in real-world is specialized nommu soc running full time, isolated behind another board/cpu.
End of conversation
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nothing with a network connection of any form should run without at least MPU protection
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I disagree. If your protocols are simple, highest risk code is in kernel/ring0 anyway.
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And if your system is single-priv-domain anyway, MMU doesn't buy you much security. Some but not much.
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That is, arbitrary code execution as the exploited app is pretty much equivalent to full-system access.
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single priv domain is completely broken. At minimum update system needs compartmentalizing.
End of conversation
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The latter is increasingly impractical with complex (encrypted, high level protocols, etc.) comm. requirements.
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