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, but use 2GiB images for beaglebone
  16 SDIMG_SIZE ?= "444"
  17 SDIMG_SIZE_beaglebone = "222"
  18
  19 IMAGE_CMD_sdimg () {
  20         SDIMG=${WORKDIR}/sd.img
  21
  22         # sanity check fstab entry for boot partition mounting
  23         if [ "x$(cat /etc/fstab | grep ${LOOPDEV_BOOT} | grep ${WORKDIR}/tmp-mnt-boot | grep user || true)" = "x" ]; then
  24                 echo "/etc/fstab entries need to be created with the user flag for the loop devices like:"
  25                 echo "${LOOPDEV_BOOT} ${WORKDIR}/tmp-mnt-boot msdos user 0 0"
  26         false
  27         fi
  28
  29         # cleanup loops
  30         for loop in ${LOOPDEV} ${LOOPDEV_BOOT} ${LOOPDEV_FS} ; do
  31                 ${LOSETUP} -d $loop || true
  32         done
  33
  34         # If an SD image is already present, reuse and reformat it
  35         if [ ! -e ${SDIMG} ] ; then
  36                 dd if=/dev/zero of=${SDIMG} bs=$(echo '255 * 63 * 512' | bc) count=${SDIMG_SIZE}
  37         fi
  38
  39         ${LOSETUP} ${LOOPDEV} ${SDIMG}
  40
  41         # Create partition table
  42         dd if=/dev/zero of=${LOOPDEV} bs=1024 count=1024
  43         SIZE=$(/sbin/fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}')
  44         CYLINDERS=$(echo $SIZE/255/63/512 | bc)
  45         {
  46         echo ,9,0x0C,*
  47         echo ,,,-
  48         } | /sbin/sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
  49
  50         # Prepare loop devices for boot and filesystem partitions
  51         BOOT_OFFSET=32256
  52         FS_OFFSET_SECT=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /"|cut -d " " -f 2)
  53         FS_OFFSET=$(echo "$FS_OFFSET_SECT * 512" | bc)
  54         FS_SIZE_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /g" \
  55         |cut -d " " -f 4 | cut -d "+" -f 1)
  56
  57         LOOPDEV_BLOCKS=$(/sbin/fdisk -l -u ${LOOPDEV} 2>&1 | grep FAT | perl -p -i -e "s/\s+/ /g"|cut -d " " -f 5)
  58         LOOPDEV_BYTES=$(echo "$LOOPDEV_BLOCKS * 1024" | bc)
  59
  60         ${LOSETUP} -d ${LOOPDEV}
  61
  62         ${LOSETUP} ${LOOPDEV_BOOT} ${SDIMG} -o ${BOOT_OFFSET}
  63
  64         /sbin/mkfs.msdos ${LOOPDEV_BOOT} -n boot $LOOPDEV_BLOCKS
  65
  66         # Prepare filesystem partition
  67         # Copy ubi used by flashing scripts
  68         if [ -e  ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ] ; then
  69                 echo "Copying UBIFS image to file system"
  70                 cp ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ${IMAGE_ROOTFS}/boot/fs.ubi
  71         fi
  72
  73         # Prepare boot partion. First mount the boot partition, and copy the boot loader and supporting files
  74         # from the root filesystem
  75
  76         mkdir -p ${WORKDIR}/tmp-mnt-boot
  77         mount $LOOPDEV_BOOT ${WORKDIR}/tmp-mnt-boot
  78
  79         echo "Copying bootloaders into the boot partition"
  80         if [ -e ${IMAGE_ROOTFS}/boot/MLO ] ; then
  81                 cp -v ${IMAGE_ROOTFS}/boot/MLO ${WORKDIR}/tmp-mnt-boot
  82         else
  83                 cp -v ${DEPLOY_DIR_IMAGE}/MLO ${WORKDIR}/tmp-mnt-boot
  84         fi
  85
  86         # Check for u-boot SPL
  87         if [ -e ${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.img ] ; then
  88                 suffix=img
  89         else
  90                 suffix=bin
  91         fi
  92
  93         if [ -e ${IMAGE_ROOTFS}/boot/u-boot.$suffix ] ; then
  94                 cp -v ${IMAGE_ROOTFS}/boot/{u-boot.$suffix,user.txt,uEnv.txt} ${WORKDIR}/tmp-mnt-boot || true
  95         else
  96                 cp -v ${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.$suffix ${WORKDIR}/tmp-mnt-boot/u-boot.$suffix
  97         fi
  98
  99         # Cleanup VFAT mount
 100         echo "Cleaning up VFAT mount"
 101         umount ${WORKDIR}/tmp-mnt-boot
 102         ${LOSETUP} -d ${LOOPDEV_BOOT} || true
 103
 104         # Prepare ext3 parition
 105         echo "Creating ext3 loopback"
 106         ${LOSETUP} ${LOOPDEV_FS} ${SDIMG} -o ${FS_OFFSET}
 107
 108         # should use fdisk info
 109         echo "Creating ext3 image"
 110         touch ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 111         genext2fs -b $FS_SIZE_BLOCKS -d ${IMAGE_ROOTFS} ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 112         tune2fs -L ${IMAGE_NAME} -j ${WORKDIR}/${IMAGE_NAME}.rootfs.ext3
 113
 114         dd if=${WORKDIR}/${IMAGE_NAME}.rootfs.ext3 of=${LOOPDEV_FS}
 115
 116         ${LOSETUP} -d ${LOOPDEV_FS} || true
 117
 118         gzip -c ${WORKDIR}/sd.img > ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}-${PR}.img.gz
 119         rm -f ${WORKDIR}/sd.img
 120 }