Hi, I'm curious about the picorv32 variant in the openlane design folder, which is called "picorv32a" I can't seem to find any docs on what the "a" means. Cheers

Maybe means the "A" extension to the ISA? See page 47 of https://riscv.org/specifications/isa-spec-pdf/

You'd have to ask @Ahmed Ghazy, but I assume it's just a suffix to differentiate it from the original, as we made several revisions of the picoRV32 to accomodate various differences such as having the memory inside the picosoc module or outside of it. Not an architectural difference but it does require refactoring the verilog code.