Created attachment 163630 [details] port Makefile patch When building lang/go with a patch similar to the one in #204882 on real ARM h/w I got: "runtime: this system has multiple CPUs and must use atomic synchronization instructions. Recompile using GOARM=7." For the background, please see https://github.com/golang/go/issues/12067 This is leading to an ugly situation, because (for FreeBSD) AMRv6 also includes ARMv7, while there are really some differences. I did set GOARM=7 in the Makefile and everything is fine for me, but this will lead to binaries not working on ARMv6 CPUs (i.e. the original RPi, while RPi 2 has ARMv7). I also didn't test this on non-hf armv6. Some ARM experts should weigh in here. :)