classes/sdcard_image.bbclass

   1 inherit image
   2
   3 # Add the fstypes we need
   4 IMAGE_FSTYPES_append = " tar.bz2 sdimg"
   5
   6 # Change this to match your host distro
   7 LOSETUP ?= "/sbin/losetup"
   8
   9 # Since these need to go in /etc/fstab we can hardcode them
  10 LOOPDEV ?= "/dev/loop1"
  11 LOOPDEV_BOOT ?= "/dev/loop2"
  12 LOOPDEV_FS ?= "/dev/loop3"
  13
  14 IMAGE_CMD_sdimg () {
  15         SDIMG=${WORKDIR}/sd.img
  16
  17         # sanity check fstab entry for boot partition mounting
  18         if [ "x$(cat /etc/fstab | grep ${LOOPDEV_BOOT} | grep ${WORKDIR}/tmp-mnt-boot | grep user || true)" = "x" ]; then
  19                 echo "/etc/fstab entries need to be created with the user flag for the loop devices like:"
  20                 echo "${LOOPDEV_BOOT} ${WORKDIR}/tmp-mnt-boot msdos user 0 0"
  21         false
  22         fi
  23
  24         # cleanup loops
  25         for loop in ${LOOPDEV} ${LOOPDEV_BOOT} ${LOOPDEV_FS} ; do
  26                 ${LOSETUP} -d $loop || true
  27         done
  28
  29         # If an SD image is already present, reuse and reformat it
  30         if [ ! -e ${SDIMG} ] ; then
  31                 dd if=/dev/zero of=${SDIMG} bs=$(echo '255 * 63 * 512' | bc) count=444
  32         fi
  33
  34         ${LOSETUP} ${LOOPDEV} ${SDIMG}
  35
  36         # Create partition table
  37         dd if=/dev/zero of=${LOOPDEV} bs=1024 count=1024
  38         SIZE=$(/sbin/fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}')
  39         CYLINDERS=$(echo $SIZE/255/63/512 | bc)
  40         {
  41         echo ,9,0x0C,*
  42         echo ,,,-
  43         } | /sbin/sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
  44
  45         # Prepare loop devices for boot and filesystem partitions
  46         BOOT_OFFSET=32256
  47         FS_OFFSET_SECT=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /"|cut -d " " -f 2)
  48         FS_OFFSET=$(echo "$FS_OFFSET_SECT * 512" | bc)
  49         FS_SIZE_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /g" \
  50         |cut -d " " -f 4 | cut -d "+" -f 1)
  51
  52         LOOPDEV_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep FAT | perl -p -i -e "s/\s+/ /g"|cut -d " " -f 5)
  53         LOOPDEV_BYTES=$(echo "$LOOPDEV_BLOCKS * 1024" | bc)
  54
  55         ${LOSETUP} -d ${LOOPDEV}
  56
  57         ${LOSETUP} ${LOOPDEV_BOOT} ${SDIMG} -o ${BOOT_OFFSET}
  58
  59         /sbin/mkfs.msdos ${LOOPDEV_BOOT} -n boot $LOOPDEV_BLOCKS
  60
  61         # Prepare filesystem partition
  62         # Copy ubi used by flashing scripts
  63         if [ -e  ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ] ; then
  64                 echo "Copying UBIFS image to file system"
  65                 cp ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ${IMAGE_ROOTFS}/boot/fs.ubi
  66         fi
  67
  68         # Prepare boot partion. First mount the boot partition, and copy the boot loader and supporting files
  69         # from the root filesystem
  70
  71         mkdir -p ${WORKDIR}/tmp-mnt-boot
  72         mount $LOOPDEV_BOOT ${WORKDIR}/tmp-mnt-boot
  73
  74         echo "Copying bootloaders into the boot partition"
  75         if [ -e ${IMAGE_ROOTFS}/boot/MLO ] ; then
  76                 cp -v ${IMAGE_ROOTFS}/boot/MLO ${WORKDIR}/tmp-mnt-boot
  77         else
  78                 cp -v ${DEPLOY_DIR_IMAGE}/MLO ${WORKDIR}/tmp-mnt-boot
  79         fi
  80
  81         # Check for u-boot SPL
  82         if [ -e ${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.img ] ; then
  83                 suffix=img
  84         else
  85                 suffix=bin
  86         fi
  87
  88         if [ -e ${IMAGE_ROOTFS}/boot/u-boot.$suffix ] ; then
  89                 cp -v ${IMAGE_ROOTFS}/boot/{u-boot.$suffix,user.txt,uEnv.txt} ${WORKDIR}/tmp-mnt-boot || true
  90         else
  91                 cp -v ${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.$suffix ${WORKDIR}/tmp-mnt-boot/u-boot.$suffix
  92         fi
  93
  94         # Cleanup VFAT mount
  95         echo "Cleaning up VFAT mount"
  96         umount ${WORKDIR}/tmp-mnt-boot
  97         ${LOSETUP} -d ${LOOPDEV_BOOT} || true
  98
  99         # Prepare ext3 parition
 100         echo "Creating ext3 loopback"
 101         ${LOSETUP} ${LOOPDEV_FS} ${SDIMG} -o ${FS_OFFSET}
 102
 103         # should use fdisk info
 104         echo "Creating ext3 image"
 105         touch ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 106         genext2fs -b $FS_SIZE_BLOCKS -d ${IMAGE_ROOTFS} ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 107         tune2fs -L ${IMAGE_NAME} -j ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 108
 109         dd if=${WORKDIR}/${IMAGE_NAME}.rootfs.ext3 of=${LOOPDEV_FS}
 110
 111         ${LOSETUP} -d ${LOOPDEV_FS} || true
 112
 113         gzip -c ${WORKDIR}/sd.img > ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}-${PR}.img.gz
 114         rm -f ${WORKDIR}/sd.img
 115 }