96 lines
1.9 KiB
Bash
96 lines
1.9 KiB
Bash
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#!/bin/sh
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set -u
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set -e
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PROGNAME=$(basename $0)
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usage()
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{
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echo "Create an SD card that boots on an i.MX6DL SABRESD board."
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echo "It is supposed to work also for the i.MX6Q SABRESD board, but"
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echo "it this is not tested."
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echo
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echo "Note: all data on the the card will be completely deleted!"
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echo "Use with care!"
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echo "Superuser permissions may be required to write to the device."
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echo
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echo "Usage: ${PROGNAME} <sd_block_device>"
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echo "Arguments:"
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echo " <sd_block_device> The device to be written to"
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echo
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echo "Example: ${PROGNAME} /dev/mmcblk0"
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echo
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}
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if [ $# -ne 1 ]; then
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usage
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exit 1
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fi
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if [ $(id -u) -ne 0 ]; then
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echo "${PROGNAME} must be run as root"
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exit 1
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fi
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DEV=${1}
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# The partition name prefix depends on the device name:
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# - /dev/sde -> /dev/sde1
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# - /dev/mmcblk0 -> /dev/mmcblk0p1
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if echo ${DEV}|grep -q mmcblk ; then
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PART="p"
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else
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PART=""
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fi
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PART1=${DEV}${PART}1
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PART2=${DEV}${PART}2
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# Unmount the partitions if mounted
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umount ${PART1} || true
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umount ${PART2} || true
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# First, clear the card
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dd if=/dev/zero of=${DEV} bs=1M count=20
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sync
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# Partition the card.
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# SD layout for i.MX6 boot:
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# - Bootloader at offset 1024
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# - FAT partition starting at 1MB offset, containing uImage and *.dtb
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# - ext2/3 partition formatted as ext2 or ext3, containing the root filesystem.
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sfdisk ${DEV} <<EOF
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32,480,b
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512,,L
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EOF
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sync
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# Copy the bootloader at offset 1024
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dd if=output/images/u-boot.imx of=${DEV} obs=512 seek=2
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# Prepare a temp dir for mounting partitions
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TMPDIR=$(mktemp -d)
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# FAT partition: kernel and DTBs
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mkfs.vfat ${PART1}
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mount ${PART1} ${TMPDIR}
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cp output/images/uImage ${TMPDIR}/
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cp output/images/*.dtb ${TMPDIR}/
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sync
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umount ${TMPDIR}
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# ext2 partition: root filesystem
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mkfs.ext2 ${PART2}
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mount ${PART2} ${TMPDIR}
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tar -C ${TMPDIR}/ -xf output/images/rootfs.tar
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sync
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umount ${TMPDIR}
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# Cleanup
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rmdir ${TMPDIR}
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sync
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echo Done
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