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diff --git a/classes/rmc-db.bbclass b/classes/rmc-db.bbclass
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+# RMC database bbclass
+# provide functions to generate RMC database file on build host (native)
+
+DEPENDS += "rmc-native"
+
+# rmc_generate_db()
+# $1: a list of directories. Each directory holds directories for a group of
+# boards.
+# $2: path_name of rmc generates database file and records
+#
+# WARNING: content of directory of database file will be removed.
+#
+# Each board directory shall contain a fingerprint file (*.fp) at least, with
+# optional file blob(s) associated to the type of board. If a board directory
+# has no file blob, no record is created for that board.
+#
+# An example of two directories each of which contains two boards for RMC:
+# (All file and directory names are for illustration purpose.)
+#
+# dir_1/
+#     board_1/
+#         board_1_fingerprint.fp
+#         file_1.blob
+#     board_2/
+#         board_2.fp
+# dir_2/
+#     board_3/
+#         b3.fp
+#         file_1.blob
+#         file_2.conf
+#     board_4/
+#         board_foo.fp
+#         mylib.config
+#
+# To generate a RMC database "rmc.db" with data of all (actually 3) of boards in
+# a directory "deploy_dir":
+#
+# rmc_generate_db "dir_1 dir_2" "deploy_dir/rmc.db"
+#
+# The board_2 will be skipped. No record or any data for it is packed in
+# generated database because it only contains a fingerprint file.
+#
+
+rmc_generate_db () {
+	RMC_BOARD_DIRS=$1
+
+	if [ "$#" -ne 2 ]; then
+		echo "rmc_generate_db(): Wrong number of arguments: $#"
+		return 1
+	fi
+
+	RMC_DB_DIR=$(dirname "$2")
+	RMC_RECORDS=""
+
+	rm -rf ${RMC_DB_DIR}
+	mkdir -p ${RMC_DB_DIR}
+
+	# generate rmc database
+	for topdir in ${RMC_BOARD_DIRS}; do
+		# For all board dirs in a topdir:
+		CUR_BOARD_DIRS=$(find ${topdir}/* -type d)
+		for board_dir in ${CUR_BOARD_DIRS}; do
+			# FIXME: we shall fail when having more than one .fp file
+			CUR_FINGERPRINT=$(find ${board_dir}/ -name "*.fp")
+
+			# disallow a board directory without any fingerprint file in it.
+			if [ -z "${CUR_FINGERPRINT}" ]; then
+				echo "Cannot find RMC fingerprint file in ${board_dir}"
+				return 1
+			fi
+
+			CUR_FILES=$(find ${board_dir}/ -type f |grep -v '\.fp$' || true)
+
+			# allow a directory only with fingerprint file. Developer may
+			# check in fingerprint for future use.
+			if [ -z "${CUR_FILES}" ]; then
+				continue
+			fi
+
+			CUR_TAG=$(echo "${board_dir}"|sed  's/\//-/g')
+			CUR_RECORD=${RMC_DB_DIR}/rmc${CUR_TAG}.rec
+
+			rmc -R -f ${CUR_FINGERPRINT} -b ${CUR_FILES} -o ${CUR_RECORD}
+
+			RMC_RECORDS="${RMC_RECORDS} ${CUR_RECORD}"
+		done
+	done
+
+	if [ ! -z "${RMC_RECORDS}" ]; then
+		rmc -D ${RMC_RECORDS} -o "$2"
+	fi
+}