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sdcard_image: Helper class to create SD Card images

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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>
This commit is contained in:
Joel A Fernandes
2011-09-23 11:32:44 -05:00
committed by Koen Kooi
parent 5c553a225d
commit fa4d0789fa
1 changed files with 78 additions and 0 deletions
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78
classes/sdcard_image.bbclass Normal file
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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
}