diff --git a/poky/meta/classes/image_types.bbclass b/poky/meta/classes/image_types.bbclass
index f363c42..1c44ec4 100644
--- a/poky/meta/classes/image_types.bbclass
+++ b/poky/meta/classes/image_types.bbclass
@@ -54,7 +54,7 @@
     # Sort the set so that ordering is consistant
     return " ".join(sorted(deps))
 
-XZ_COMPRESSION_LEVEL ?= "-3"
+XZ_COMPRESSION_LEVEL ?= "-9"
 XZ_INTEGRITY_CHECK ?= "crc32"
 
 ZIP_COMPRESSION_LEVEL ?= "-9"
@@ -170,7 +170,9 @@
 	echo vol_type=dynamic >> ubinize${vname}-${IMAGE_NAME}.cfg
 	echo vol_name=${UBI_VOLNAME} >> ubinize${vname}-${IMAGE_NAME}.cfg
 	echo vol_flags=autoresize >> ubinize${vname}-${IMAGE_NAME}.cfg
-	mkfs.ubifs -r ${IMAGE_ROOTFS} -o ${IMGDEPLOYDIR}/${IMAGE_NAME}${vname}${IMAGE_NAME_SUFFIX}.ubifs ${mkubifs_args}
+	if [ -n "$vname" ]; then
+		mkfs.ubifs -r ${IMAGE_ROOTFS} -o ${IMGDEPLOYDIR}/${IMAGE_NAME}${vname}${IMAGE_NAME_SUFFIX}.ubifs ${mkubifs_args}
+	fi
 	ubinize -o ${IMGDEPLOYDIR}/${IMAGE_NAME}${vname}${IMAGE_NAME_SUFFIX}.ubi ${ubinize_args} ubinize${vname}-${IMAGE_NAME}.cfg
 
 	# Cleanup cfg file
@@ -204,6 +206,7 @@
 IMAGE_CMD_ubi () {
 	multiubi_mkfs "${MKUBIFS_ARGS}" "${UBINIZE_ARGS}"
 }
+IMAGE_TYPEDEP_ubi = "ubifs"
 
 IMAGE_CMD_ubifs = "mkfs.ubifs -r ${IMAGE_ROOTFS} -o ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.ubifs ${MKUBIFS_ARGS}"