image_types.bbclass: implement jffs2 summary images (sum.jffs2)

* Building the jffs2 filesystem to include summary information speeds up
* the mount process considerably at the cost of increased size.
* The rate of speedup is generally higher on NAND chips and on the chips
* where the erase block size is large.

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 29b63806e6785eb4039d99ecfb19675aa0faaa30..bd4b7bcf4c4d0c275aa6ff3643b174abc09a19ba 100644 (file)
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -35,6 +35,8 @@ XZ_COMPRESSION_LEVEL ?= "-e -9"
 XZ_INTEGRITY_CHECK ?= "crc32"
 
 IMAGE_CMD_jffs2 = "mkfs.jffs2 --root=${IMAGE_ROOTFS} --faketime --output=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.jffs2 ${EXTRA_IMAGECMD}"
+IMAGE_CMD_sum.jffs2 = "${IMAGE_CMD_jffs2} && sumtool -i ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.jffs2 \
+       -o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.sum.jffs2 ${EXTRA_IMAGECMD}"
 
 IMAGE_CMD_cramfs = "mkcramfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cramfs ${EXTRA_IMAGECMD}"
 
@@ -138,6 +140,7 @@ EXTRA_IMAGECMD_btrfs ?= ""
 
 IMAGE_DEPENDS = ""
 IMAGE_DEPENDS_jffs2 = "mtd-utils-native"
+IMAGE_DEPENDS_sum.jffs2 = "mtd-utils-native"
 IMAGE_DEPENDS_cramfs = "cramfs-native"
 IMAGE_DEPENDS_ext2 = "genext2fs-native"
 IMAGE_DEPENDS_ext2.gz = "genext2fs-native"
@@ -157,4 +160,4 @@ IMAGE_DEPENDS_ubi = "mtd-utils-native"
 IMAGE_DEPENDS_ubifs = "mtd-utils-native"
 
 # This variable is available to request which values are suitable for IMAGE_FSTYPES
-IMAGE_TYPES = "jffs2 cramfs ext2 ext2.gz ext2.bz2 ext3 ext3.gz ext2.lzma live squashfs squashfs-lzma ubi tar tar.gz tar.bz2 tar.xz cpio cpio.gz cpio.xz cpio.lzma"
+IMAGE_TYPES = "jffs2 sum.jffs2 cramfs ext2 ext2.gz ext2.bz2 ext3 ext3.gz ext2.lzma live squashfs squashfs-lzma ubi tar tar.gz tar.bz2 tar.xz cpio cpio.gz cpio.xz cpio.lzma"