98 lines
1.9 KiB
Bash
98 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.MX28 EVK board."
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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}${PART}2
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PART3=${DEV}${PART}3
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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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umount ${PART3} || true
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# First, clear the card
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dd if=/dev/zero of=${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.MX28 boot:
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# - Special partition type 53 at sector 2048, containing an SD-SB-encapsulated u-boot
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# - FAT partition containing zImage
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# - ext2/3 partition formatted as ext2 or ext3, containing the root filesystem.
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sfdisk --force -u S ${DEV} <<EOF
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2048,2000,53
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4048,16000,b
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20048,,L
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EOF
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sync
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# Copy the bootloader at offset 2048
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# (We need to skip the partition table in the .sd, too.)
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dd if=output/images/u-boot.sd of=${DEV}1 bs=1M
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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
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mkfs.vfat ${PART2}
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mount ${PART2} ${TMPDIR}
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cp output/images/*Image ${TMPDIR}/
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cp output/images/*.dtb ${TMPDIR}/ || true
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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 ${PART3}
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mount ${PART3} ${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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