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by zu2_ 1252 days ago
Oh, I was mistaken. I've verified that at least the rev instruction works (tested on clang -march=rv64imafdcb0p94).
2 comments

It is quite possible it implements some B instructions (like the Za or Zb extensions) but not B as a whole.
Got mine.

OpenSBI says:

Boot HART Base ISA : rv64imafdcbx