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I don't think that includes CSR accesses, that's >> its own extension (Zicsr). > > Before this commit it was enough to build the Linux kernel. Which is an apparently valid observation, but not an excuse. > What letter needs to be added to get Zicsr extensions, though? That's not a single letter iirc, and I'm afraid I can't tell you the right spelling off the top of my head. I'm pretty sure gas doc has it. Might be something like rv64ima_zicsr. Jan