There's both 'open source hardware' and 'free hardware' definitions (see last year in this forum for links). The open source hardware definition is about zero fee (gratis) use of the hardware design. Free hardware OTOH is more closely aligned with free software. Although AIUI they accept the use of non-free software tools for putting HDL on FPGAs and ASICS until such time as libre FPGA hardware is available in a bootstrapping / parallel development combination.

In his GNU 30th speech RMS encouraged the free software community to work with the free hardware community in the hope of creating a fully free non-traitorous computer platform. He did say free software shouldn't regard that as the only option, reverse engineering proprietary hardware is also needed.

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