diff --git a/amlogic_utils.sh b/amlogic_utils.sh
index cadb93d7f..56b98ceb4 100644
--- a/amlogic_utils.sh
+++ b/amlogic_utils.sh
@@ -807,6 +807,7 @@ function rename_external_module_name() {
 }
 export -f rename_external_module_name
 
+# function rebuild_rootfs can rebuild the rootfs if rootfs_base.cpio.gz.uboot exist
 function rebuild_rootfs() {
 	echo
         echo "========================================================"
@@ -849,6 +850,9 @@ function rebuild_rootfs() {
 }
 export -f rebuild_rootfs
 
+# function check_undefined_symbol can check the dependence among the modules
+# parameter:
+#	--modules_depend
 function check_undefined_symbol() {
 	if [[ ${MODULES_DEPEND} != "1" ]]; then
 		return
@@ -950,3 +954,212 @@ function abi_symbol_list_detect () { # detect symbol information that should be
 }
 export -f abi_symbol_list_detect
 
+# adjust_config_action concerns three types of cmd:
+# parameters:
+#	--menuconfig:      make menuconfig manually based on different gki standard
+#	--basicconfig:     only config kernel with google original gki_defconfig as base
+#	--check_defconfig: contrast the defconfig generated in out directory with gki_defconfig and show the difference
+function adjust_config_action () {
+	if [[ -n ${MENUCONFIG} ]] || [[ -n ${BASICCONFIG} ]] || [[ ${CHECK_DEFCONFIG} -eq "1" ]]; then
+		# ${ROOT_DIR}/${BUILD_DIR}/config.sh menuconfig
+		HERMETIC_TOOLCHAIN=0
+		source "${ROOT_DIR}/${BUILD_DIR}/build_utils.sh"
+		source "${ROOT_DIR}/${BUILD_DIR}/_setup_env.sh"
+
+		orig_config=$(mktemp)
+		orig_defconfig=$(mktemp)
+		out_config="${OUT_DIR}/.config"
+		out_defconfig="${OUT_DIR}/defconfig"
+		changed_config=$(mktemp)
+		changed_defconfig=$(mktemp)
+
+		if [[ -n ${BASICCONFIG} ]]; then # config kernel with gki_defconfig or make menuconfig based on it
+			set -x
+			defconfig_name=`basename ${GKI_BASE_CONFIG}`
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${defconfig_name})
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
+			cp ${out_config} ${orig_config}
+			cp ${out_defconfig} ${orig_defconfig}
+			if [ "${BASICCONFIG}" = "m" ]; then # make menuconfig based on gki_defconfig
+				(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" menuconfig)
+			fi
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
+			${KERNEL_DIR}/scripts/diffconfig ${orig_config} ${out_config} > ${changed_config}
+			${KERNEL_DIR}/scripts/diffconfig ${orig_defconfig} ${out_defconfig} > ${changed_defconfig}
+			if [ "${ARCH}" = "arm" ]; then
+				cp ${out_defconfig} ${GKI_BASE_CONFIG}
+			fi
+			set +x # show the difference between the gki_defconfig and the config after make menuconfig
+			echo
+			echo "========================================================"
+			echo "==================== .config diff   ===================="
+			cat ${changed_config}
+			echo "==================== defconfig diff ===================="
+			cat ${changed_defconfig}
+			echo "========================================================"
+			echo
+		elif [[ ${CHECK_DEFCONFIG} -eq "1" ]]; then # compare the defconfig generated in out directory with gki_defconfig
+			set -x
+			pre_defconfig_cmds
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${DEFCONFIG})
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig) # export the defconfig to out directory
+			diff -u ${ROOT_DIR}/${GKI_BASE_CONFIG} ${OUT_DIR}/defconfig
+			post_defconfig_cmds
+			set +x
+		else # make menuconfig based on config with different gki standard
+			set -x
+			pre_defconfig_cmds
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${DEFCONFIG})
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
+			cp ${out_config} ${orig_config}
+			cp ${out_defconfig} ${orig_defconfig}
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" menuconfig)
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
+			${KERNEL_DIR}/scripts/diffconfig ${orig_config} ${out_config} > ${changed_config}
+			${KERNEL_DIR}/scripts/diffconfig ${orig_defconfig} ${out_defconfig} > ${changed_defconfig}
+			post_defconfig_cmds
+			set +x
+			echo
+			echo "========================================================"
+			echo "if the config follows GKI2.0, please add it to the file amlogic_gki.fragment manually"
+			echo "if the config follows GKI1.0 optimize, please add it to the file amlogic_gki.10 manually"
+			echo "if the config follows GKI1.0 debug, please add it to the file amlogic_gki.debug manually"
+			echo "==================== .config diff   ===================="
+			cat ${changed_config}
+			echo "==================== defconfig diff ===================="
+			cat ${changed_defconfig}
+			echo "========================================================"
+			echo
+		fi
+		rm -f ${orig_config} ${changed_config} ${orig_defconfig} ${changed_defconfig}
+		exit
+	fi
+}
+export -f adjust_config_action
+
+# function build_part_of_kernel can only build part of kernel such as image modules or dtbs
+# parameter:
+#	--image:   only build image
+#	--modules: only build kernel modules
+#	--dtbs:    only build dtbs
+function build_part_of_kernel () {
+	if [[ -n ${IMAGE} ]] || [[ -n ${MODULES} ]] || [[ -n ${DTB_BUILD} ]]; then
+		old_path=${PATH}
+		source "${ROOT_DIR}/${BUILD_DIR}/build_utils.sh"
+		source "${ROOT_DIR}/${BUILD_DIR}/_setup_env.sh"
+
+		if [[ ! -f ${OUT_DIR}/.config ]]; then
+			pre_defconfig_cmds
+			set -x
+			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${DEFCONFIG})
+			set +x
+			post_defconfig_cmds
+		fi
+
+		if [[ -n ${IMAGE} ]]; then
+			set -x
+			if [ "${ARCH}" = "arm64" ]; then
+				(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) Image)
+			elif [ "${ARCH}" = "arm" ]; then
+				(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) LOADADDR=0x108000 uImage)
+			fi
+			set +x
+		fi
+		mkdir -p ${DIST_DIR}
+		if [[ -n ${DTB_BUILD} ]]; then
+			set -x
+			(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) dtbs)
+			set +x
+		fi
+		if [[ -n ${MODULES} ]]; then
+			export MODULES_STAGING_DIR=$(readlink -m ${COMMON_OUT_DIR}/staging)
+			rm -rf ${MODULES_STAGING_DIR}
+			mkdir -p ${MODULES_STAGING_DIR}
+			if [ "${DO_NOT_STRIP_MODULES}" != "1" ]; then
+				MODULE_STRIP_FLAG="INSTALL_MOD_STRIP=1"
+			fi
+			if [[ `grep "CONFIG_AMLOGIC_IN_KERNEL_MODULES=y" ${ROOT_DIR}/${FRAGMENT_CONFIG}` ]]; then
+				set -x
+				(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) modules)
+				(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} ${MODULE_STRIP_FLAG} INSTALL_MOD_PATH=${MODULES_STAGING_DIR} "${MAKE_ARGS[@]}" modules_install)
+				set +x
+			fi
+			echo EXT_MODULES=$EXT_MODULES
+			prepare_module_build
+			if [[ -z "${SKIP_EXT_MODULES}" ]] && [[ -n "${EXT_MODULES}" ]]; then
+				echo "========================================================"
+				echo " Building external modules and installing them into staging directory"
+				KERNEL_UAPI_HEADERS_DIR=$(readlink -m ${COMMON_OUT_DIR}/kernel_uapi_headers)
+				for EXT_MOD in ${EXT_MODULES}; do
+					EXT_MOD_REL=$(rel_path ${ROOT_DIR}/${EXT_MOD} ${KERNEL_DIR})
+					mkdir -p ${OUT_DIR}/${EXT_MOD_REL}
+					set -x
+					make -C ${EXT_MOD} M=${EXT_MOD_REL} KERNEL_SRC=${ROOT_DIR}/${KERNEL_DIR}  \
+						O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}"
+					make -C ${EXT_MOD} M=${EXT_MOD_REL} KERNEL_SRC=${ROOT_DIR}/${KERNEL_DIR}  \
+						O=${OUT_DIR} ${TOOL_ARGS} ${MODULE_STRIP_FLAG}         \
+						INSTALL_MOD_PATH=${MODULES_STAGING_DIR}                \
+						INSTALL_MOD_DIR="extra/${EXT_MOD}"                     \
+						INSTALL_HDR_PATH="${KERNEL_UAPI_HEADERS_DIR}/usr"      \
+						"${MAKE_ARGS[@]}" modules_install
+					set +x
+				done
+			fi
+			export OUT_AMLOGIC_DIR=$(readlink -m ${COMMON_OUT_DIR}/amlogic)
+			set -x
+			extra_cmds
+			set +x
+			MODULES=$(find ${MODULES_STAGING_DIR} -type f -name "*.ko")
+			cp -p ${MODULES} ${DIST_DIR}
+
+			new_path=${PATH}
+			PATH=${old_path}
+			echo "========================================================"
+			if [ -f ${ROOT_DIR}/${KERNEL_DIR}/${COMMON_DRIVERS_DIR}/rootfs_base.cpio.gz.uboot ]; then
+				echo "Rebuild rootfs in order to install modules!"
+				rebuild_rootfs ${ARCH}
+			else
+				echo "There's no file ${ROOT_DIR}/${KERNEL_DIR}/${COMMON_DRIVERS_DIR}/rootfs_base.cpio.gz.uboot, so don't rebuild rootfs!"
+			fi
+			PATH=${new_path}
+		fi
+		if [ -n "${DTS_EXT_DIR}" ]; then
+			if [ -d "${ROOT_DIR}/${DTS_EXT_DIR}" ]; then
+				DTS_EXT_DIR=$(rel_path ${ROOT_DIR}/${DTS_EXT_DIR} ${KERNEL_DIR})
+				if [ -d ${OUT_DIR}/${DTS_EXT_DIR} ]; then
+					FILES="$FILES `ls ${OUT_DIR}/${DTS_EXT_DIR}`"
+				fi
+			fi
+		fi
+		for FILE in ${FILES}; do
+			if [ -f ${OUT_DIR}/${FILE} ]; then
+				echo "  $FILE"
+				cp -p ${OUT_DIR}/${FILE} ${DIST_DIR}/
+			elif [[ "${FILE}" =~ \.dtb|\.dtbo ]]  && \
+				[ -n "${DTS_EXT_DIR}" ] && [ -f "${OUT_DIR}/${DTS_EXT_DIR}/${FILE}" ] ; then
+				# DTS_EXT_DIR is recalculated before to be relative to KERNEL_DIR
+				echo "  $FILE"
+				cp -p "${OUT_DIR}/${DTS_EXT_DIR}/${FILE}" "${DIST_DIR}/"
+			else
+				echo "  $FILE is not a file, skipping"
+			fi
+		done
+		exit
+	fi
+}
+
+export -f build_part_of_kernel
+
+function export_env_variable () {
+	export ABI BUILD_CONFIG LTO KMI_SYMBOL_LIST_STRICT_MODE CHECK_DEFCONFIG MANUAL_INSMOD_MODULE ARCH
+	export KERNEL_DIR COMMON_DRIVERS_DIR BUILD_DIR ANDROID_PROJECT GKI_CONFIG UPGRADE_PROJECT FAST_BUILD CHECK_GKI_20 DEV_CONFIG CONFIG_GROUP
+	export FULL_KERNEL_VERSION BAZEL
+
+	echo ROOT_DIR=$ROOT_DIR
+	echo ABI=${ABI} BUILD_CONFIG=${BUILD_CONFIG} LTO=${LTO} KMI_SYMBOL_LIST_STRICT_MODE=${KMI_SYMBOL_LIST_STRICT_MODE} CHECK_DEFCONFIG=${CHECK_DEFCONFIG} MANUAL_INSMOD_MODULE=${MANUAL_INSMOD_MODULE}
+	echo KERNEL_DIR=${KERNEL_DIR} COMMON_DRIVERS_DIR=${COMMON_DRIVERS_DIR} BUILD_DIR=${BUILD_DIR} ANDROID_PROJECT=${ANDROID_PROJECT} GKI_CONFIG=${GKI_CONFIG} UPGRADE_PROJECT=${UPGRADE_PROJECT} FAST_BUILD=${FAST_BUILD} CHECK_GKI_20=${CHECK_GKI_20}
+	echo FULL_KERNEL_VERSION=${FULL_KERNEL_VERSION} BAZEL=${BAZEL}
+	echo MENUCONFIG=${MENUCONFIG} BASICCONFIG=${BASICCONFIG} IMAGE=${IMAGE} MODULES=${MODULES} DTB_BUILD=${DTB_BUILD}
+}
+
+export -f export_env_variable
diff --git a/mk.sh b/mk.sh
index 4a57559df..954bc901f 100755
--- a/mk.sh
+++ b/mk.sh
@@ -293,194 +293,14 @@ else
 fi
 
 set -e
-export ABI BUILD_CONFIG LTO KMI_SYMBOL_LIST_STRICT_MODE CHECK_DEFCONFIG MANUAL_INSMOD_MODULE ARCH
-export KERNEL_DIR COMMON_DRIVERS_DIR BUILD_DIR ANDROID_PROJECT GKI_CONFIG UPGRADE_PROJECT FAST_BUILD CHECK_GKI_20 DEV_CONFIG CONFIG_GROUP
-export FULL_KERNEL_VERSION BAZEL
 
-echo ROOT_DIR=$ROOT_DIR
-echo ABI=${ABI} BUILD_CONFIG=${BUILD_CONFIG} LTO=${LTO} KMI_SYMBOL_LIST_STRICT_MODE=${KMI_SYMBOL_LIST_STRICT_MODE} CHECK_DEFCONFIG=${CHECK_DEFCONFIG} MANUAL_INSMOD_MODULE=${MANUAL_INSMOD_MODULE}
-echo KERNEL_DIR=${KERNEL_DIR} COMMON_DRIVERS_DIR=${COMMON_DRIVERS_DIR} BUILD_DIR=${BUILD_DIR} ANDROID_PROJECT=${ANDROID_PROJECT} GKI_CONFIG=${GKI_CONFIG} UPGRADE_PROJECT=${UPGRADE_PROJECT} FAST_BUILD=${FAST_BUILD} CHECK_GKI_20=${CHECK_GKI_20}
-echo FULL_KERNEL_VERSION=${FULL_KERNEL_VERSION} BAZEL=${BAZEL}
+source "${KERNEL_DIR}/${COMMON_DRIVERS_DIR}/amlogic_utils.sh"
 
-echo MENUCONFIG=${MENUCONFIG} BASICCONFIG=${BASICCONFIG} IMAGE=${IMAGE} MODULES=${MODULES} DTB_BUILD=${DTB_BUILD}
-if [[ -n ${MENUCONFIG} ]] || [[ -n ${BASICCONFIG} ]] || [[ ${CHECK_DEFCONFIG} -eq "1" ]]; then
-	# ${ROOT_DIR}/${BUILD_DIR}/config.sh menuconfig
-	HERMETIC_TOOLCHAIN=0
-	source "${ROOT_DIR}/${BUILD_DIR}/build_utils.sh"
-	source "${ROOT_DIR}/${BUILD_DIR}/_setup_env.sh"
+export_env_variable
 
-	orig_config=$(mktemp)
-	orig_defconfig=$(mktemp)
-	out_config="${OUT_DIR}/.config"
-	out_defconfig="${OUT_DIR}/defconfig"
-	changed_config=$(mktemp)
-	changed_defconfig=$(mktemp)
+adjust_config_action
 
-	if [[ -n ${BASICCONFIG} ]]; then
-		set -x
-		defconfig_name=`basename ${GKI_BASE_CONFIG}`
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${defconfig_name})
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
-		cp ${out_config} ${orig_config}
-		cp ${out_defconfig} ${orig_defconfig}
-		if [ "${BASICCONFIG}" = "m" ]; then
-			(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" menuconfig)
-		fi
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
-		${KERNEL_DIR}/scripts/diffconfig ${orig_config} ${out_config} > ${changed_config}
-		${KERNEL_DIR}/scripts/diffconfig ${orig_defconfig} ${out_defconfig} > ${changed_defconfig}
-		if [ "${ARCH}" = "arm" ]; then
-			cp ${out_defconfig} ${GKI_BASE_CONFIG}
-		fi
-		set +x
-		echo
-		echo "========================================================"
-		echo "==================== .config diff   ===================="
-		cat ${changed_config}
-		echo "==================== defconfig diff ===================="
-		cat ${changed_defconfig}
-		echo "========================================================"
-		echo
-	elif [[ ${CHECK_DEFCONFIG} -eq "1" ]]; then
-		set -x
-		pre_defconfig_cmds
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${DEFCONFIG})
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
-		diff -u ${ROOT_DIR}/${GKI_BASE_CONFIG} ${OUT_DIR}/defconfig
-		post_defconfig_cmds
-		set +x
-	else
-		set -x
-		pre_defconfig_cmds
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${DEFCONFIG})
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
-		cp ${out_config} ${orig_config}
-		cp ${out_defconfig} ${orig_defconfig}
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" menuconfig)
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" savedefconfig)
-		${KERNEL_DIR}/scripts/diffconfig ${orig_config} ${out_config} > ${changed_config}
-		${KERNEL_DIR}/scripts/diffconfig ${orig_defconfig} ${out_defconfig} > ${changed_defconfig}
-		post_defconfig_cmds
-		set +x
-		echo
-		echo "========================================================"
-		echo "if the config follows GKI2.0, please add it to the file amlogic_gki.fragment manually"
-		echo "if the config follows GKI1.0 optimize, please add it to the file amlogic_gki.10 manually"
-		echo "if the config follows GKI1.0 debug, please add it to the file amlogic_gki.debug manually"
-		echo "==================== .config diff   ===================="
-		cat ${changed_config}
-		echo "==================== defconfig diff ===================="
-		cat ${changed_defconfig}
-		echo "========================================================"
-		echo
-	fi
-	rm -f ${orig_config} ${changed_config} ${orig_defconfig} ${changed_defconfig}
-	exit
-fi
-
-if [[ -n ${IMAGE} ]] || [[ -n ${MODULES} ]] || [[ -n ${DTB_BUILD} ]]; then
-	old_path=${PATH}
-	source "${ROOT_DIR}/${BUILD_DIR}/build_utils.sh"
-	source "${ROOT_DIR}/${BUILD_DIR}/_setup_env.sh"
-
-	if [[ ! -f ${OUT_DIR}/.config ]]; then
-		pre_defconfig_cmds
-		set -x
-		(cd ${KERNEL_DIR} && make ${TOOL_ARGS} O=${OUT_DIR} "${MAKE_ARGS[@]}" ${DEFCONFIG})
-		set +x
-		post_defconfig_cmds
-	fi
-
-	if [[ -n ${IMAGE} ]]; then
-		set -x
-		if [ "${ARCH}" = "arm64" ]; then
-			(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) Image)
-		elif [ "${ARCH}" = "arm" ]; then
-			(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) LOADADDR=0x108000 uImage)
-		fi
-		set +x
-	fi
-	mkdir -p ${DIST_DIR}
-	if [[ -n ${DTB_BUILD} ]]; then
-		set -x
-		(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) dtbs)
-		set +x
-	fi
-	if [[ -n ${MODULES} ]]; then
-		export MODULES_STAGING_DIR=$(readlink -m ${COMMON_OUT_DIR}/staging)
-		rm -rf ${MODULES_STAGING_DIR}
-		mkdir -p ${MODULES_STAGING_DIR}
-		if [ "${DO_NOT_STRIP_MODULES}" != "1" ]; then
-			MODULE_STRIP_FLAG="INSTALL_MOD_STRIP=1"
-		fi
-		if [[ `grep "CONFIG_AMLOGIC_IN_KERNEL_MODULES=y" ${ROOT_DIR}/${FRAGMENT_CONFIG}` ]]; then
-			set -x
-			(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}" -j$(nproc) modules)
-			(cd ${OUT_DIR} && make O=${OUT_DIR} ${TOOL_ARGS} ${MODULE_STRIP_FLAG} INSTALL_MOD_PATH=${MODULES_STAGING_DIR} "${MAKE_ARGS[@]}" modules_install)
-			set +x
-		fi
-		echo EXT_MODULES=$EXT_MODULES
-		prepare_module_build
-		if [[ -z "${SKIP_EXT_MODULES}" ]] && [[ -n "${EXT_MODULES}" ]]; then
-			echo "========================================================"
-			echo " Building external modules and installing them into staging directory"
-			KERNEL_UAPI_HEADERS_DIR=$(readlink -m ${COMMON_OUT_DIR}/kernel_uapi_headers)
-			for EXT_MOD in ${EXT_MODULES}; do
-				EXT_MOD_REL=$(rel_path ${ROOT_DIR}/${EXT_MOD} ${KERNEL_DIR})
-				mkdir -p ${OUT_DIR}/${EXT_MOD_REL}
-				set -x
-				make -C ${EXT_MOD} M=${EXT_MOD_REL} KERNEL_SRC=${ROOT_DIR}/${KERNEL_DIR}  \
-					O=${OUT_DIR} ${TOOL_ARGS} "${MAKE_ARGS[@]}"
-				make -C ${EXT_MOD} M=${EXT_MOD_REL} KERNEL_SRC=${ROOT_DIR}/${KERNEL_DIR}  \
-					O=${OUT_DIR} ${TOOL_ARGS} ${MODULE_STRIP_FLAG}         \
-					INSTALL_MOD_PATH=${MODULES_STAGING_DIR}                \
-					INSTALL_MOD_DIR="extra/${EXT_MOD}"                     \
-					INSTALL_HDR_PATH="${KERNEL_UAPI_HEADERS_DIR}/usr"      \
-					"${MAKE_ARGS[@]}" modules_install
-				set +x
-			done
-		fi
-		export OUT_AMLOGIC_DIR=$(readlink -m ${COMMON_OUT_DIR}/amlogic)
-		set -x
-		extra_cmds
-		set +x
-		MODULES=$(find ${MODULES_STAGING_DIR} -type f -name "*.ko")
-		cp -p ${MODULES} ${DIST_DIR}
-
-		new_path=${PATH}
-		PATH=${old_path}
-		echo "========================================================"
-		if [ -f ${ROOT_DIR}/${KERNEL_DIR}/${COMMON_DRIVERS_DIR}/rootfs_base.cpio.gz.uboot ]; then
-			echo "Rebuild rootfs in order to install modules!"
-			rebuild_rootfs ${ARCH}
-		else
-			echo "There's no file ${ROOT_DIR}/${KERNEL_DIR}/${COMMON_DRIVERS_DIR}/rootfs_base.cpio.gz.uboot, so don't rebuild rootfs!"
-		fi
-		PATH=${new_path}
-	fi
-	if [ -n "${DTS_EXT_DIR}" ]; then
-		if [ -d "${ROOT_DIR}/${DTS_EXT_DIR}" ]; then
-			DTS_EXT_DIR=$(rel_path ${ROOT_DIR}/${DTS_EXT_DIR} ${KERNEL_DIR})
-			if [ -d ${OUT_DIR}/${DTS_EXT_DIR} ]; then
-				FILES="$FILES `ls ${OUT_DIR}/${DTS_EXT_DIR}`"
-			fi
-		fi
-	fi
-	for FILE in ${FILES}; do
-		if [ -f ${OUT_DIR}/${FILE} ]; then
-			echo "  $FILE"
-			cp -p ${OUT_DIR}/${FILE} ${DIST_DIR}/
-		elif [[ "${FILE}" =~ \.dtb|\.dtbo ]]  && \
-			[ -n "${DTS_EXT_DIR}" ] && [ -f "${OUT_DIR}/${DTS_EXT_DIR}/${FILE}" ] ; then
-			# DTS_EXT_DIR is recalculated before to be relative to KERNEL_DIR
-			echo "  $FILE"
-			cp -p "${OUT_DIR}/${DTS_EXT_DIR}/${FILE}" "${DIST_DIR}/"
-		else
-			echo "  $FILE is not a file, skipping"
-		fi
-	done
-	exit
-fi
+build_part_of_kernel
 
 if [ "${ABI}" -eq "1" ]; then
 	${ROOT_DIR}/${BUILD_DIR}/build_abi.sh "$@"
@@ -588,25 +408,17 @@ fi
 source ${ROOT_DIR}/${BUILD_CONFIG}
 
 source ${KERNEL_BUILD_VAR_FILE}
+
 if [[ -n ${RM_KERNEL_BUILD_VAR_FILE} ]]; then
 	rm -f ${KERNEL_BUILD_VAR_FILE}
 fi
 
 rename_external_module_name
 
-echo "========================================================"
-if [ -f ${ROOT_DIR}/${KERNEL_DIR}/${COMMON_DRIVERS_DIR}/rootfs_base.cpio.gz.uboot ]; then
-	echo "Rebuild rootfs in order to install modules!"
-	rebuild_rootfs ${ARCH}
-else
-	echo "There's no file ${ROOT_DIR}/${KERNEL_DIR}/${COMMON_DRIVERS_DIR}/rootfs_base.cpio.gz.uboot, so don't rebuild rootfs!"
-fi
+rebuild_rootfs ${ARCH}
+
 set +e
 
-if [[ ${MODULES_DEPEND} -eq "1" ]]; then
-	echo "========================================================"
-	echo "print modules depend"
-	check_undefined_symbol
-fi
+check_undefined_symbol
 
-abi_symbol_list_detect # detect symbol information that should be submitted
+abi_symbol_list_detect