sdcard_image: Helper class to create SD Card images
authorJoel A Fernandes <joelagnel@ti.com>
Fri, 23 Sep 2011 16:32:44 +0000 (11:32 -0500)
committerKoen Kooi <koen@dominion.thruhere.net>
Sun, 25 Sep 2011 14:43:25 +0000 (16:43 +0200)
Tested with 3 different beagleboard image release builds so far

For ideas, referenced Narcissus image builder written by Koen Kooi <k-kooi@ti.com>

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
classes/sdcard_image.bbclass [new file with mode: 0644]

diff --git a/classes/sdcard_image.bbclass b/classes/sdcard_image.bbclass
new file mode 100644 (file)
index 0000000..b3885df
--- /dev/null
@@ -0,0 +1,78 @@
+inherit image
+
+IMAGE_CMD_sdimg () {
+       SDIMG=${WORKDIR}/sd.img
+
+       # cleanup loops
+       for loop in $(losetup -j ${SDIMG}); do
+               loop_dev=$(echo $loop|cut -d ":" -f 1)
+               umount $loop_dev || true
+               losetup -d $loop_dev || true
+       done
+
+       dd if=/dev/zero of=${SDIMG} bs=4k seek=$(echo '256 * 1024' | bc) count=1
+       losetup -f ${SDIMG}
+       LOOPDEV=$(losetup -j ${SDIMG} -o 0 | cut -d ":" -f 1)
+
+       # Create partition table
+       dd if=/dev/zero of=${LOOPDEV} bs=1024 count=1024
+       SIZE=`fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}'`
+       CYLINDERS=`echo $SIZE/255/63/512 | bc`
+       {
+       echo ,9,0x0C,*
+       echo ,,,-
+       } | sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
+
+       # Prepare loop devices for boot and filesystem partitions
+       BOOT_OFFSET=32256
+       FS_OFFSET_SECT=$(/sbin/fdisk -l -u $LOOPDEV 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /"|cut -d " " -f 2)
+       FS_OFFSET=$(echo "$FS_OFFSET_SECT * 512" | bc)
+       FS_SIZE_BLOCKS=$(/sbin/fdisk -l -u $LOOPDEV 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /g" \ 
+       |cut -d " " -f 4 | cut -d "+" -f 1)
+       LOOPDEV_BLOCKS=$(/sbin/fdisk -l -u $LOOPDEV 2>&1 | grep FAT | perl -p -i -e "s/\s+/ /g"|cut -d " " -f 5)
+       LOOPDEV_BYTES=$(echo "$LOOPDEV_BLOCKS * 1024" | bc)
+
+       losetup -f ${SDIMG} -o ${BOOT_OFFSET} --sizelimit=$LOOPDEV_BYTES
+
+       LOOPDEV_BOOT=$(losetup -j ${SDIMG} -o ${BOOT_OFFSET} | cut -d ":" -f 1)
+        mkfs.msdos ${LOOPDEV_BOOT} -n boot
+
+       losetup -f ${SDIMG} -o ${FS_OFFSET}     
+       LOOPDEV_FS=$(losetup -j ${SDIMG} -o ${FS_OFFSET} | cut -d ":" -f 1)
+
+       # Prepare filesystem partition
+       # Copy ubi used by flashing scripts
+       if [ -e  ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ] ; then
+               echo "Copying UBIFS image to file system"
+               cp ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ${IMAGE_ROOTFS}/boot/fs.ubi
+       fi
+       ROOTFS_SIZE="$(du -ks ${IMAGE_ROOTFS} | awk '{print 65536 + $1}')"
+       genext2fs -b ${FS_SIZE_BLOCKS} -d ${IMAGE_ROOTFS} ${LOOPDEV_FS}
+       tune2fs -j ${LOOPDEV_FS}
+
+       # Prepare boot partion. First mount the boot partition, and copy the boot loader and supporting files
+       # from the root filesystem
+
+       # sanity check fstab entry for boot partition mounting
+       if [ "x$(cat /etc/fstab | grep $LOOPDEV_BOOT | grep ${WORKDIR}/tmp-mnt-boot | grep user || true)" = "x" ]; then
+               echo "/etc/fstab entries need to be created with the user flag for $LOOPDEV_BOOT like:"
+               echo "$LOOPDEV_BOOT ${WORKDIR}/tmp-mnt-boot msdos user 0 0"
+               false
+       fi
+
+       mkdir -p ${WORKDIR}/tmp-mnt-boot
+       mount $LOOPDEV_BOOT
+
+       echo "Copying bootloaders into the boot partition"
+       cp -v ${IMAGE_ROOTFS}/boot/MLO ${WORKDIR}/tmp-mnt-boot 
+       cp -v ${IMAGE_ROOTFS}/boot/{u-boot.bin,user.txt,uEnv.txt} ${WORKDIR}/tmp-mnt-boot || true
+
+       # cleanup
+       umount ${LOOPDEV_BOOT}
+       /sbin/losetup -d ${LOOPDEV}
+       /sbin/losetup -d ${LOOPDEV_BOOT}
+       /sbin/losetup -d ${LOOPDEV_FS}
+
+       gzip -c ${WORKDIR}/sd.img > ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}-${PR}.img.gz
+}