buildroot

#!/bin/sh

​

set -u

set -e

​

PROGNAME=$(basename $0)

​

usage()

{

    echo "Create an SD card that boots on an i.MX53/6 board."

    echo

    echo "Note: all data on the the card will be completely deleted!"

    echo "Use with care!"

    echo "Superuser permissions may be required to write to the device."

    echo

    echo "Usage: ${PROGNAME} <sd_block_device>"

    echo "Arguments:"

    echo "  <sd_block_device>     The device to be written to"

    echo

    echo "Example: ${PROGNAME} /dev/mmcblk0"

    echo

}

​

if [ $# -ne 1 ]; then

    usage

    exit 1

fi

​

if [ $(id -u) -ne 0 ]; then

    echo "${PROGNAME} must be run as root"

    exit 1

fi

​

DEV=${1}

​

# The partition name prefix depends on the device name:

# - /dev/sde -> /dev/sde1

# - /dev/mmcblk0 -> /dev/mmcblk0p1

if echo ${DEV}|grep -q mmcblk ; then

    PART="p"

else

    PART=""

fi

​

PART1=${DEV}${PART}1

PART2=${DEV}${PART}2

​

# Unmount the partitions if mounted

umount ${PART1} || true

umount ${PART2} || true

​

# First, clear the card

dd if=/dev/zero of=${DEV} bs=1M count=20

​

sync

​

# Partition the card.

# SD layout for i.MX6 boot:

# - Bootloader at offset 1024

# - FAT partition starting at 1MB offset, containing uImage and *.dtb

# - ext2/3 partition formatted as ext2 or ext3, containing the root filesystem.

sfdisk ${DEV} <<EOF

32,480,b

512,,L

EOF

​

sync

​

# Copy the bootloader at offset 1024

dd if=output/images/u-boot.imx of=${DEV} obs=512 seek=2

​

# Prepare a temp dir for mounting partitions

TMPDIR=$(mktemp -d)

​

# FAT partition: kernel and DTBs

mkfs.vfat ${PART1}

mount ${PART1} ${TMPDIR}

cp output/images/*Image ${TMPDIR}/

cp output/images/*.dtb  ${TMPDIR}/ || true

sync

umount ${TMPDIR}

​

# ext2 partition: root filesystem

mkfs.ext2 ${PART2}

mount ${PART2} ${TMPDIR}

tar -C ${TMPDIR}/ -xf output/images/rootfs.tar

sync

umount ${TMPDIR}

​

# Cleanup

rmdir ${TMPDIR}

sync