diff --git a/poky/meta/classes/uboot-sign.bbclass b/poky/meta/classes/uboot-sign.bbclass
index 9e3d1d6..8beafff 100644
--- a/poky/meta/classes/uboot-sign.bbclass
+++ b/poky/meta/classes/uboot-sign.bbclass
@@ -45,49 +45,72 @@
 # Functions in this bbclass is for u-boot only
 UBOOT_PN = "${@d.getVar('PREFERRED_PROVIDER_u-boot') or 'u-boot'}"
 
+concat_dtb_helper() {
+	if [ -e "${UBOOT_DTB_BINARY}" ]; then
+		ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_BINARY}
+		ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_SYMLINK}
+	fi
+
+	if [ -f "${UBOOT_NODTB_BINARY}" ]; then
+		install ${UBOOT_NODTB_BINARY} ${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}
+		ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_SYMLINK}
+		ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_BINARY}
+	fi
+
+	# Concatenate U-Boot w/o DTB & DTB with public key
+	# (cf. kernel-fitimage.bbclass for more details)
+	deployed_uboot_dtb_binary='${DEPLOY_DIR_IMAGE}/${UBOOT_DTB_IMAGE}'
+	if [ "x${UBOOT_SUFFIX}" = "ximg" -o "x${UBOOT_SUFFIX}" = "xrom" ] && \
+		[ -e "$deployed_uboot_dtb_binary" ]; then
+		oe_runmake EXT_DTB=$deployed_uboot_dtb_binary
+		install ${UBOOT_BINARY} ${DEPLOYDIR}/${UBOOT_IMAGE}
+	elif [ -e "${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}" -a -e "$deployed_uboot_dtb_binary" ]; then
+		cd ${DEPLOYDIR}
+		cat ${UBOOT_NODTB_IMAGE} $deployed_uboot_dtb_binary | tee ${UBOOT_BINARY} > ${UBOOT_IMAGE}
+	else
+		bbwarn "Failure while adding public key to u-boot binary. Verified boot won't be available."
+	fi
+}
+
 concat_dtb() {
-	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${PN}" = "${UBOOT_PN}" ]; then
+	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${PN}" = "${UBOOT_PN}" -a -n "${UBOOT_DTB_BINARY}" ]; then
 		mkdir -p ${DEPLOYDIR}
-		if [ -e ${B}/${UBOOT_DTB_BINARY} ]; then
-			ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_BINARY}
-			ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_SYMLINK}
-		fi
-
-		if [ -f ${B}/${UBOOT_NODTB_BINARY} ]; then
-            install ${B}/${UBOOT_NODTB_BINARY} ${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}
-            ln -sf ${UBOOT_NODTB_IMAGE} ${UBOOT_NODTB_SYMLINK}
-            ln -sf ${UBOOT_NODTB_IMAGE} ${UBOOT_NODTB_BINARY}
-		fi
-
-		# Concatenate U-Boot w/o DTB & DTB with public key
-		# (cf. kernel-fitimage.bbclass for more details)
-		deployed_uboot_dtb_binary='${DEPLOY_DIR_IMAGE}/${UBOOT_DTB_IMAGE}'
-		if [ "x${UBOOT_SUFFIX}" = "ximg" -o "x${UBOOT_SUFFIX}" = "xrom" ] && \
-			[ -e "$deployed_uboot_dtb_binary" ]; then
+		if [ -n "${UBOOT_CONFIG}" ]; then
+			for config in ${UBOOT_MACHINE}; do
+				cd ${B}/${config}
+				concat_dtb_helper
+			done
+		else
 			cd ${B}
-			oe_runmake EXT_DTB=$deployed_uboot_dtb_binary
-			install ${B}/${UBOOT_BINARY} ${DEPLOYDIR}/${UBOOT_IMAGE}
-		elif [ -e "${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}" -a -e "$deployed_uboot_dtb_binary" ]; then
-			cd ${DEPLOYDIR}
-			cat ${UBOOT_NODTB_IMAGE} $deployed_uboot_dtb_binary | tee ${B}/${UBOOT_BINARY} > ${UBOOT_IMAGE}
-		elif [ -n "${UBOOT_DTB_BINARY}" ]; then
-			bbwarn "Failure while adding public key to u-boot binary. Verified boot won't be available."
+			concat_dtb_helper
 		fi
 	fi
 }
 
 # Install UBOOT_DTB_BINARY to datadir, so that kernel can use it for
 # signing, and kernel will deploy UBOOT_DTB_BINARY after signs it.
+install_helper() {
+	if [ -f "${UBOOT_DTB_BINARY}" ]; then
+		install -d ${D}${datadir}
+		# UBOOT_DTB_BINARY is a symlink to UBOOT_DTB_IMAGE, so we
+		# need both of them.
+		install ${UBOOT_DTB_BINARY} ${D}${datadir}/${UBOOT_DTB_IMAGE}
+		ln -sf ${UBOOT_DTB_IMAGE} ${D}${datadir}/${UBOOT_DTB_BINARY}
+	else
+		bbwarn "${UBOOT_DTB_BINARY} not found"
+	fi
+}
+
 do_install_append() {
-	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${PN}" = "${UBOOT_PN}" ]; then
-		if [ -f ${B}/${UBOOT_DTB_BINARY} ]; then
-			install -d ${D}${datadir}
-			# UBOOT_DTB_BINARY is a symlink to UBOOT_DTB_IMAGE, so we
-			# need both of them.
-			install ${B}/${UBOOT_DTB_BINARY} ${D}${datadir}/${UBOOT_DTB_IMAGE}
-			ln -sf ${UBOOT_DTB_IMAGE} ${D}${datadir}/${UBOOT_DTB_BINARY}
-		elif [ -n "${UBOOT_DTB_BINARY}" ]; then
-			bbwarn "${B}/${UBOOT_DTB_BINARY} not found"
+	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${PN}" = "${UBOOT_PN}" -a -n "${UBOOT_DTB_BINARY}" ]; then
+		if [ -n "${UBOOT_CONFIG}" ]; then
+			for config in ${UBOOT_MACHINE}; do
+				cd ${B}/${config}
+				install_helper
+			done
+		else
+			cd ${B}
+			install_helper
 		fi
 	fi
 }