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