diff --git a/ports/mimxrt/Makefile b/ports/mimxrt/Makefile
index 870248373e..fdb1325fdd 100644
--- a/ports/mimxrt/Makefile
+++ b/ports/mimxrt/Makefile
@@ -297,7 +297,7 @@ OBJ += $(BUILD)/pins_gen.o
 # Workaround for bug in older gcc, warning on "static usbd_device_t _usbd_dev = { 0 };"
 $(BUILD)/lib/tinyusb/src/device/usbd.o: CFLAGS += -Wno-missing-braces
 
-all: $(BUILD)/firmware.hex
+all: $(BUILD)/firmware.hex $(BUILD)/firmware.bin
 
 $(BUILD)/firmware.elf: $(OBJ)
 	$(ECHO) "LINK $@"
diff --git a/tools/autobuild/autobuild.sh b/tools/autobuild/autobuild.sh
index 45822f2b7d..0498443811 100755
--- a/tools/autobuild/autobuild.sh
+++ b/tools/autobuild/autobuild.sh
@@ -66,6 +66,8 @@ cd ../esp32
 ${AUTODIR}/build-esp32-latest.sh ${IDF_PATH_V4} ${FW_TAG} ${LOCAL_FIRMWARE}
 cd ../rp2
 ${AUTODIR}/build-rp2-latest.sh ${FW_TAG} ${LOCAL_FIRMWARE}
+cd ../mimxrt
+${AUTODIR}/build-mimxrt-latest.sh ${FW_TAG} ${LOCAL_FIRMWARE}
 
 popd
 
diff --git a/tools/autobuild/build-mimxrt-latest.sh b/tools/autobuild/build-mimxrt-latest.sh
new file mode 100755
index 0000000000..e36b294aca
--- /dev/null
+++ b/tools/autobuild/build-mimxrt-latest.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# function for building firmware
+function do_build() {
+    descr=$1
+    board=$2
+    ext=$3
+    shift
+    shift
+    shift
+    echo "building $descr $board"
+    build_dir=/tmp/mimxrt-build-$board
+    $MICROPY_AUTOBUILD_MAKE $@ BOARD=$board BUILD=$build_dir || exit 1
+    mv $build_dir/firmware.$ext $dest_dir/$descr$fw_tag.$ext
+    rm -rf $build_dir
+}
+
+# check/get parameters
+if [ $# != 2 ]; then
+    echo "usage: $0 <fw-tag> <dest-dir>"
+    exit 1
+fi
+
+fw_tag=$1
+dest_dir=$2
+
+# check we are in the correct directory
+if [ ! -r modmimxrt.c ]; then
+    echo "must be in mimxrt directory"
+    exit 1
+fi
+
+# build the boards
+do_build TEENSY40 TEENSY40 hex
+do_build TEENSY41 TEENSY41 hex
+do_build MIMXRT1020_EVK MIMXRT1020_EVK bin