diff --git a/yotta/create-module.sh b/yotta/create-module.sh
new file mode 100755
index 0000000..73dc925
--- /dev/null
+++ b/yotta/create-module.sh
@@ -0,0 +1,66 @@
+#!/bin/sh
+
+set -eu
+
+TREE=..
+
+# default values, can be overriden by the environment
+: ${DEST:=module}
+: ${BUILD:=1}
+
+# make sure we're running in our own directory
+if [ -f create-module.sh ]; then :; else
+    cd $( dirname $0 )
+    if [ -f create-module.sh ]; then :; else
+        echo "Please run the script from is directory." >&2
+        exit 1
+    fi
+fi
+
+# use a temporary directory to build the module, then rsync to DEST
+# this allows touching only new files, for more efficient re-builds
+TMP=$DEST-tmp
+rm -rf $TMP
+
+mkdir -p $TMP/mbedtls $TMP/source
+cp $TREE/include/mbedtls/*.h $TMP/mbedtls
+cp $TREE/library/*.c $TMP/source
+
+# temporary, should depend on external module later
+cp data/entropy_hardware_poll.c $TMP/source
+cp data/target_config.h $TMP/mbedtls
+
+data/adjust-config.sh $TREE/scripts/config.pl $TMP/mbedtls/config.h
+
+mkdir -p $TMP/test
+cp -r data/example-* $TMP/test
+# later we should have the generated test suites here too
+
+cp data/module.json $TMP
+cp data/README.md $TMP
+
+mkdir -p $DEST
+rsync -cr --delete --exclude build --exclude yotta_\* $TMP/ $DEST/
+rm -rf $TMP
+
+echo "mbed TLS yotta module created in '$DEST'."
+
+test_build()
+{
+    TARGET=$1
+    echo; echo "*** Doing a test build for $TARGET ***"
+    ( cd $DEST && yt target $TARGET && yt build )
+}
+
+if [ $BUILD -eq 1 ]; then
+    if uname -a | grep 'Linux.*x86' >/dev/null; then
+        test_build x86-linux-native
+    fi
+
+    if uname -a | grep 'Darwin.*x86' >/dev/null; then
+        test_build x86-osx-native
+    fi
+
+    # do that one last so that it remains the target
+    test_build frdm-k64f-gcc
+fi