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SCOUNTEREN and SENVCFG may not be supported on certain RISC-V core, so check the existence of these CSRs via privilege spec version to prevent illegal instructions. Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com> Signed-off-by: Alvin Chang <alvinga@andestech.com> Reviewed-by: Anup Patel <anup@brainfault.org>