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 # Since the vars are weakly assigned, you can override them from your local.conf
  11 LOOPDEV ?= "/dev/loop1"
  12 LOOPDEV_BOOT ?= "/dev/loop2"
  13 LOOPDEV_FS ?= "/dev/loop3"
  14
  15 # Default to 4GiB images
  16 SDIMG_SIZE ?= "444"
  17
  18 BOOTPARTNAME_beaglebone = "BEAGLE_BONE"
  19 BOOTPARTNAME ?= "${MACHINE}"
  20
  21 IMAGEDATESTAMP = "${@time.strftime('%Y.%m.%d',time.gmtime())}"
  22
  23 IMAGE_CMD_sdimg () {
  24         SDIMG=${WORKDIR}/sd.img
  25
  26         # sanity check fstab entry for boot partition mounting
  27         if [ "x$(cat /etc/fstab | grep ${LOOPDEV_BOOT} | grep ${WORKDIR}/tmp-mnt-boot | grep user || true)" = "x" ]; then
  28                 echo "/etc/fstab entries need to be created with the user flag for the loop devices like:"
  29                 echo "${LOOPDEV_BOOT} ${WORKDIR}/tmp-mnt-boot msdos user 0 0"
  30         false
  31         fi
  32
  33         # cleanup loops
  34         for loop in ${LOOPDEV} ${LOOPDEV_BOOT} ${LOOPDEV_FS} ; do
  35                 ${LOSETUP} -d $loop || true
  36         done
  37
  38         # If an SD image is already present, reuse and reformat it
  39         if [ ! -e ${SDIMG} ] ; then
  40                 dd if=/dev/zero of=${SDIMG} bs=$(echo '255 * 63 * 512' | bc) count=${SDIMG_SIZE}
  41         fi
  42
  43         ${LOSETUP} ${LOOPDEV} ${SDIMG}
  44
  45         # Create partition table
  46         dd if=/dev/zero of=${LOOPDEV} bs=1024 count=1024
  47         SIZE=$(/sbin/fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}')
  48         CYLINDERS=$(echo $SIZE/255/63/512 | bc)
  49         {
  50         echo ,9,0x0C,*
  51         echo ,,,-
  52         } | /sbin/sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
  53
  54         # Prepare loop devices for boot and filesystem partitions
  55         BOOT_OFFSET=32256
  56         FS_OFFSET_SECT=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /"|cut -d " " -f 2)
  57         FS_OFFSET=$(echo "$FS_OFFSET_SECT * 512" | bc)
  58         FS_SIZE_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /g" \
  59         |cut -d " " -f 4 | cut -d "+" -f 1)
  60
  61         LOOPDEV_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep FAT | perl -p -i -e "s/\s+/ /g"|cut -d " " -f 5)
  62         LOOPDEV_BYTES=$(echo "$LOOPDEV_BLOCKS * 1024" | bc)
  63
  64         ${LOSETUP} -d ${LOOPDEV}
  65
  66         ${LOSETUP} ${LOOPDEV_BOOT} ${SDIMG} -o ${BOOT_OFFSET}
  67
  68         /sbin/mkfs.msdos ${LOOPDEV_BOOT} -n ${BOOTPARTNAME} $LOOPDEV_BLOCKS
  69
  70         # Prepare filesystem partition
  71         # Copy ubi used by flashing scripts
  72         if [ -e  ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ] ; then
  73                 echo "Copying UBIFS image to file system"
  74                 cp ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ${IMAGE_ROOTFS}/boot/fs.ubi
  75         fi
  76
  77         # Prepare boot partion. First mount the boot partition, and copy the boot loader and supporting files
  78         # from the root filesystem
  79
  80         mkdir -p ${WORKDIR}/tmp-mnt-boot
  81         mount $LOOPDEV_BOOT ${WORKDIR}/tmp-mnt-boot
  82
  83         echo "Copying bootloaders into the boot partition"
  84         if [ -e ${IMAGE_ROOTFS}/boot/MLO ] ; then
  85                 cp -v ${IMAGE_ROOTFS}/boot/MLO ${WORKDIR}/tmp-mnt-boot
  86         else
  87                 cp -v ${DEPLOY_DIR_IMAGE}/MLO ${WORKDIR}/tmp-mnt-boot
  88         fi
  89
  90         # Check for u-boot SPL
  91         if [ -e ${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.img ] ; then
  92                 suffix=img
  93         else
  94                 suffix=bin
  95         fi
  96
  97         cp -v ${IMAGE_ROOTFS}/boot/uEnv.txt ${WORKDIR}/tmp-mnt-boot || true
  98         cp -v ${IMAGE_ROOTFS}/boot/user.txt ${WORKDIR}/tmp-mnt-boot || true
  99
 100         if [ -e ${IMAGE_ROOTFS}/boot/u-boot.$suffix ] ; then
 101                 cp -v ${IMAGE_ROOTFS}/boot/{u-boot.$suffix} ${WORKDIR}/tmp-mnt-boot || true
 102         else
 103                 cp -v ${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.$suffix ${WORKDIR}/tmp-mnt-boot/u-boot.$suffix
 104         fi
 105
 106         # Cleanup VFAT mount
 107         echo "Cleaning up VFAT mount"
 108         umount ${WORKDIR}/tmp-mnt-boot
 109         ${LOSETUP} -d ${LOOPDEV_BOOT} || true
 110
 111         # Prepare ext3 parition
 112         echo "Creating ext3 loopback"
 113         ${LOSETUP} ${LOOPDEV_FS} ${SDIMG} -o ${FS_OFFSET}
 114
 115         # should use fdisk info
 116         echo "Creating ext3 image"
 117         touch ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 118         # lots of small files, so use 8k per inode, not 64k
 119         genext2fs -i 8192 -b $FS_SIZE_BLOCKS -d ${IMAGE_ROOTFS} ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 120         tune2fs -L ${IMAGE_NAME} -j ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 121
 122         dd if=${WORKDIR}/${IMAGE_NAME}.rootfs.ext3 of=${LOOPDEV_FS}
 123
 124         ${LOSETUP} -d ${LOOPDEV_FS} || true
 125
 126         gzip -c ${WORKDIR}/sd.img > ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}-${IMAGEDATESTAMP}.img.gz
 127         rm -f ${WORKDIR}/sd.img
 128 }