#!/bin/bash
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#
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# Reference: <<i.MX Linux® User's Guide.pdf>>
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#
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# SD Card partition layout: 1 Sector= 512B
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#
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# +-------------------------------+-----------------------+---------------------------------+
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# | Start Address | Size | Usage |
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# +-------------------------------+-----------------------+---------------------------------+
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# | 0x0 | 2 sectors(1K) | Reserved for partition table |
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# +-------------------------------+-----------------------+---------------------------------+
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# | 2 sector(1K, 0x400) | 20414 sectors(9M+) | i.MX6ULL u-boot image |
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# +-------------------------------+-----------------------+---------------------------------+
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# | 20480 sector(10M, 0xa00000) | 204800 sectors(100MB) | FAT32 Boot partition |
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# +-------------------------------+-----------------------+---------------------------------+
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# | 225280 sector(110M,0x6e00000) | Remaining Space | EXT4 filesystem for rootfs |
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# +-------------------------------+-----------------------+---------------------------------+
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#
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source ../scripts//setup_env.sh
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IMAGE_NAME=$(eval echo `jq -r ".IMAGE_CONF.NAME" $JSON_CONF`)
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IMAGE_SIZE=`jq -r ".IMAGE_CONF.SIZE" $JSON_CONF`
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IMG_COMPRESS=`jq -r ".IMAGE_CONF.COMPRESS" $JSON_CONF`
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# uboot name and MMC sector offset and size
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IMG_UBOOT=$(eval echo `jq -r ".BOOT_CONF.IMG_UBOOT" $JSON_CONF`)
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MMC_SECSIZE=`jq -r ".BOOT_CONF.SECSIZE" $JSON_CONF`
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UBOOT_OFSET=`jq -r ".BOOT_CONF.OFFSET" $JSON_CONF`
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# U-boot space Size 10MB
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UBOOT_SIZE=`jq -r ".BOOT_CONF.UBOOT_SIZE" $JSON_CONF`
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# vfat boot partition 100MB
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BOOT_SIZE=`jq -r ".BOOT_CONF.BOOT_PART" $JSON_CONF`
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MNT_POINT=./mnt
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LOOP_DEV=`losetup -f | cut -d/ -f3`
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function exit_handler()
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{
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echo "Shell script exit now, do some clean work"
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echo ""
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set +e
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mountpoint $MNT_POINT > /dev/null 2>&1
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if [ $? == 0 ] ; then
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echo "umount ${MNT_POINT}"
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umount ${MNT_POINT}
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fi
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rm -rf ${MNT_POINT}
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if [ -L /dev/mapper/${LOOP_DEV}p1 ] ; then
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echo "kpartx -dv /dev/${LOOP_DEV}"
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kpartx -dv /dev/${LOOP_DEV}
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fi
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losetup -a | grep "${LOOP_DEV}" > /dev/null 2>&1
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if [ $? == 0 ] ; then
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echo "losetup -d /dev/${LOOP_DEV}"
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losetup -d /dev/${LOOP_DEV}
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fi
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}
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function generate_image()
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{
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# FAT32 boot partition start/end address in MB
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BOOT_START=${UBOOT_SIZE}
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BOOT_END=`expr ${BOOT_START} + ${BOOT_SIZE}`
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pr_warn "Generate system image "
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dd if=/dev/zero of=${IMAGE_NAME} bs=1024k count=${IMAGE_SIZE} && sync
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chmod a+x ${IMAGE_NAME}
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pr_warn "Partition system image"
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parted ${IMAGE_NAME} mklabel msdos
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parted ${IMAGE_NAME} mkpart primary fat32 ${BOOT_START}M ${BOOT_END}M
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parted ${IMAGE_NAME} mkpart primary ext4 ${BOOT_END}M 100%
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sync
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}
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function format_partition()
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{
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pr_warn "losetup image on $LOOP_DEV"
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losetup /dev/${LOOP_DEV} ${IMAGE_NAME}
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kpartx -av /dev/${LOOP_DEV}
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pr_warn "format system image partition"
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mkfs.vfat /dev/mapper/${LOOP_DEV}p1
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mkfs.ext4 /dev/mapper/${LOOP_DEV}p2
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sync
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}
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function install_sysimg()
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{
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pr_warn "install u-boot image"
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sudo dd if=${IMG_UBOOT} of=${IMAGE_NAME} bs=${MMC_SECSIZE} seek=${UBOOT_OFSET} conv=notrunc,sync
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pr_warn "install linux kernel image"
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mkdir -p ${MNT_POINT}
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mount -t vfat /dev/mapper/${LOOP_DEV}p1 ${MNT_POINT}
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do_install_json $JSON_CONF "BOOT_IMAGES"
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umount ${MNT_POINT}
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}
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function install_rootfs()
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{
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pr_warn "install root filesystem "
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mount -t ext4 /dev/mapper/${LOOP_DEV}p2 ${MNT_POINT}
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do_install_json $JSON_CONF "BOOT_ROOTFS"
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sync
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umount ${MNT_POINT}
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}
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function do_distclean()
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{
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pr_warn "clean images files "
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rm -f *.img *.imx *.bz2 *.gz
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rm -rf boot drivers
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exit 0;
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}
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function do_image()
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{
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mkdir -p ${MNT_POINT}
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generate_image
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format_partition
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install_sysimg
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install_rootfs
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if [ $IMG_COMPRESS == yes ] ;then
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pr_warn " bzip2 compress system image "
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rm -f ${IMAGE_NAME}*.bz2
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bzip2 ${IMAGE_NAME}
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fi
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rm -rf ${MNT_POINT}
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pr_warn "generate system image done"
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}
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function do_root()
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{
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echo ""
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if [[ $1 == "yes" ]] && [ `id -u` != 0 ] ; then
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echo "ERROR: This action must run as root!"
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echo ""
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exit;
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elif [[ $1 != "yes" ]] && [ `id -u` == 0 ] ; then
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echo "ERROR: This action cannot run as root!"
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echo ""
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exit;
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fi
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}
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function do_usage()
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{
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echo ""
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echo "Usage:"
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echo " $0 [-b] [-c] [-h]"
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echo " -b: download and build $PRJ_NAME"
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echo " -c: clean all the source code"
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echo " -h: show this help message"
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echo ""
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echo " WARNNING: This shell script must run as sudo"
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echo ""
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exit;
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}
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trap 'exit_handler' EXIT
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while getopts "bch" OPTNAME
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do
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case "${OPTNAME}" in
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"b")
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break;
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;;
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"c")
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do_distclean
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;;
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"*")
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do_usage
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;;
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esac
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done
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do_root "yes"
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do_image
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exit;
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