diff --git a/ports/unix/Makefile b/ports/unix/Makefile
index 3b52507c9e..79b203b6b0 100644
--- a/ports/unix/Makefile
+++ b/ports/unix/Makefile
@@ -245,7 +245,7 @@ coverage:
 	$(MAKE) \
 	    COPT="-O0" CFLAGS_EXTRA='$(CFLAGS_EXTRA) -DMP_CONFIGFILE="<mpconfigport_coverage.h>" \
 	    -fprofile-arcs -ftest-coverage \
-	    -Wformat -Wmissing-declarations -Wmissing-prototypes -Wsign-compare \
+	    -Wdouble-promotion -Wformat -Wmissing-declarations -Wmissing-prototypes -Wsign-compare \
 	    -Wold-style-definition -Wpointer-arith -Wshadow -Wuninitialized -Wunused-parameter \
 	    -DMICROPY_UNIX_COVERAGE' \
 	    LDFLAGS_EXTRA='-fprofile-arcs -ftest-coverage' \
diff --git a/tools/build_adafruit_bins.py b/tools/build_adafruit_bins.py
index fd0282b552..778cfd8690 100755
--- a/tools/build_adafruit_bins.py
+++ b/tools/build_adafruit_bins.py
@@ -44,17 +44,24 @@ for board in build_boards:
             exit_status = make_result.returncode
             success = "\033[31mfailed\033[0m"
 
+        other_output = ""
+
         for extension in board_info["extensions"]:
             temp_filename = "../ports/{port}/build-{board}/firmware.{extension}".format(port=board_info["port"], board=board, extension=extension)
             final_filename = "adafruit-circuitpython-{board}-{language}-{version}.{extension}".format(board=board, language=language, version=version, extension=extension)
             final_filename = os.path.join(bin_directory, final_filename)
-            shutil.copyfile(temp_filename, final_filename)
+            try:
+                shutil.copyfile(temp_filename, final_filename)
+            except FileNotFoundError:
+                other_output = "Cannot find file {}".format(temp_filename)
+                if exit_status == 0:
+                    exit_status = 1
 
         if travis:
             print('travis_fold:start:adafruit-bins-{}-{}\\r'.format(language, board))
         print("Build {} for {} took {:.2f}s and {}".format(board, language, build_duration, success))
-        print(len(make_result.stdout))
         print(make_result.stdout.decode("utf-8"))
+        print(other_output)
         # Only upload to Rosie if its a pull request.
         if travis:
             for rosie in ROSIE_SETUPS:
diff --git a/tools/build_board_info.py b/tools/build_board_info.py
index f6b2d3b09a..ced6725336 100644
--- a/tools/build_board_info.py
+++ b/tools/build_board_info.py
@@ -29,9 +29,12 @@ extension_by_port = {
 # Per board overrides
 extension_by_board = {
     "feather_nrf52832": BIN,
+    "arduino_mkr1300": BIN,
     "arduino_zero": BIN,
     "feather_m0_adalogger": BIN_UF2,
     "feather_m0_basic": BIN_UF2,
+    "feather_m0_rfm69": BIN,
+    "feather_m0_rfm9x": BIN,
     "makerdiary_nrf52840_mdk": HEX
 }