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Safety-critical systems such as those in automotive, avionics and space,require appropriate safety measures to avoid silent data corruption upon randomhardware errors such as those caused by radiation and other types ofelectromagnetic interference. Those safety measures must be able to preventfaults from causing the so-called common cause failures (CCFs), which occurwhen a fault produces identical errors in redundant elements so that comparisonfails to detect the errors and a failure arises. The usual solution to avoidCCFs in CPU cores is using lockstep cores, so that two cores execute the sameflow of instructions, but with some time staggering so that their state isnever identical and faults can only lead to different errors, which are thendetectable by means of comparison. This paper extends Gaisler's RISC-V NOEL-Vcore with lockstep; and presents future prospects for its use and distribution.

SafeLS: Toward Building a Lockstep NOEL-V Core