As you say this, I realize I can't find anywhere that it does. I do not know why I thought it did. Possibly as U74-MC[0] supports that option. Interestingly,

As you say this, I realize I can't find anywhere that it does. I do not know why I thought it did. Possibly as U74-MC[0] supports that option. Interestingly, I also took a look at RVA22[1], and found it requires Zbb but not the whole B. Your /proc/cpuinfo isn't listing Z* extensions. Maybe lscpu output would be more detailed? 0. https://www.sifive.com/cores/u74-mc https://www.sifive.com/cores/u74-mc 1. https://github.com/riscv/riscv-profiles/blob/main/profiles.adoc#rva22u64-mandatory-base https://github.com/riscv/riscv-profiles/blob/main/profiles.a...