Minimum CSR requirements to run Linux

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What are the minimum CSR required to run Linux on a RISC-V processor?
The privileged ISA spec does not seem to clarify this point.

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Erik Eidt On

A minimum requirement for an operating system would be to be able to service exceptions: external interrupts & software exceptions.

The following two answers may shed some light on this, though will not answer specifically the question of the requirements for linux.  I don't know the additional requirements of linux, but we would be thinking about clock/timer, virtual memory, others?