There is one SCP firmware implementation currently available, Crust.
https://github.com/cncf/xds.git
https://github.com/madler/zlib
https://github.com/google/re2.git
https://github.com/envoyproxy/protoc-gen-validate.git
https://github.com/open-telemetry/opentelemetry-proto.git
https://github.com/census-instrumentation/opencensus-proto.git
https://github.com/libuv/libuv.git
https://github.com/googleapis/googleapis.git
https://github.com/envoyproxy/data-plane-api.git
https://github.com/c-ares/c-ares.git
https://github.com/google/bloaty.git
https://github.com/google/boringssl.git
https://github.com/abseil/abseil-cpp.git