In asm/internal/asm/endtoend_test.go

func TestARMEndToEnd(t *testing.T) {
defer os.Setenv("GOARM", os.Getenv("GOARM"))

for _, goarm := range []string{"5", "6", "7"} {
	os.Setenv("GOARM", goarm)
	t.Logf("GOARM=%v", os.Getenv("GOARM"))
	testEndToEnd(t, "arm", "arm")
}

}

It expects to do ARM encoding test for ARMv5, ARMv6, and ARMv7. But actually all 3 tests are done with GOARM=5, and all instructions are encoded for ARMv5, with "GOROOT_BOOTSTRAP=/opt/go1.6 ./all.bash".

I have to do "GOROOT_BOOTSTRAP=/opt/go1.6 GOARM=6 ./all.bash" to test ARMv6 encoding.