board/freescale/create-boot-sd.sh

   1 #!/bin/sh
   2
   3 set -u
   4 set -e
   5
   6 PROGNAME=$(basename $0)
   7
   8 usage()
   9 {
  10     echo "Create an SD card that boots on an i.MX53/6 board."
  11     echo
  12     echo "Note: all data on the the card will be completely deleted!"
  13     echo "Use with care!"
  14     echo "Superuser permissions may be required to write to the device."
  15     echo
  16     echo "Usage: ${PROGNAME} <sd_block_device>"
  17     echo "Arguments:"
  18     echo "  <sd_block_device>     The device to be written to"
  19     echo
  20     echo "Example: ${PROGNAME} /dev/mmcblk0"
  21     echo
  22 }
  23
  24 if [ $# -ne 1 ]; then
  25     usage
  26     exit 1
  27 fi
  28
  29 if [ $(id -u) -ne 0 ]; then
  30     echo "${PROGNAME} must be run as root"
  31     exit 1
  32 fi
  33
  34 DEV=${1}
  35
  36 # The partition name prefix depends on the device name:
  37 # - /dev/sde -> /dev/sde1
  38 # - /dev/mmcblk0 -> /dev/mmcblk0p1
  39 if echo ${DEV}|grep -q mmcblk ; then
  40     PART="p"
  41 else
  42     PART=""
  43 fi
  44
  45 PART1=${DEV}${PART}1
  46 PART2=${DEV}${PART}2
  47
  48 # Unmount the partitions if mounted
  49 umount ${PART1} || true
  50 umount ${PART2} || true
  51
  52 # First, clear the card
  53 dd if=/dev/zero of=${DEV} bs=1M count=20
  54
  55 sync
  56
  57 # Partition the card.
  58 # SD layout for i.MX6 boot:
  59 # - Bootloader at offset 1024
  60 # - FAT partition starting at 1MB offset, containing uImage and *.dtb
  61 # - ext2/3 partition formatted as ext2 or ext3, containing the root filesystem.
  62 sfdisk ${DEV} <<EOF
  63 32,480,b
  64 512,,L
  65 EOF
  66
  67 sync
  68
  69 # Copy the bootloader at offset 1024
  70 dd if=output/images/u-boot.imx of=${DEV} obs=512 seek=2
  71
  72 # Prepare a temp dir for mounting partitions
  73 TMPDIR=$(mktemp -d)
  74
  75 # FAT partition: kernel and DTBs
  76 mkfs.vfat ${PART1}
  77 mount ${PART1} ${TMPDIR}
  78 cp output/images/*Image ${TMPDIR}/
  79 cp output/images/*.dtb  ${TMPDIR}/ || true
  80 sync
  81 umount ${TMPDIR}
  82
  83 # ext2 partition: root filesystem
  84 mkfs.ext2 ${PART2}
  85 mount ${PART2} ${TMPDIR}
  86 tar -C ${TMPDIR}/ -xf output/images/rootfs.tar
  87 sync
  88 umount ${TMPDIR}
  89
  90 # Cleanup
  91 rmdir ${TMPDIR}
  92 sync
  93 echo Done