#!/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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PRJ_PATH=`pwd`
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IMAGE_PATH=${PRJ_PATH}/bin/
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BOARD=imx6ull
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# rootfs should be buildroot or stretch/buster/bullseye for debian system
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ROOTFS=buildroot
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# linux kernel tarball path and branch
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TAR_PATH=${PRJ_PATH}/../tarball
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BOOT=emmc
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IMAGE_NAME=linuxsys_${BOARD}_${ROOTFS}.img
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if [ $ROOTFS == buildroot ] ; then
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IMAGE_SIZE=512
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else
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IMAGE_SIZE=2048
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fi
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#i.MX6/i.MX7 read uboot from mmc start on sector #2
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UBOOT_OFSET=2
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MMC_SECSIZE=512
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# U-boot space Size 10MB
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UBOOT_SIZE=10
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# vfat boot partition 100MB
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BOOT_SIZE=100
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IMG_UBOOT=${IMAGE_PATH}/u-boot-imx6ull-emmc.imx
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IMG_KERNEL=${IMAGE_PATH}/zImage
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IMG_DTB=${IMAGE_PATH}/imx6ull-emmc.dtb
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ROOTFS_TAR=${TAR_PATH}/rootfs_${ROOTFS}.tar.bz2
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MNT_POINT=./mnt
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LOOP_DEV=`losetup -f | cut -d/ -f3`
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set -u
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set -e
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if [ `id -u` != 0 ] ; then
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echo "ERROR: This shell script must run as root"
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exit 0;
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fi
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trap 'exit_handler' EXIT
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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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mountpoint $MNT_POINT > /dev/null 2>&1
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if [ $? == 0 ] ; then
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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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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 [ $? == 0 ] ; then
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losetup -d /dev/${LOOP_DEV}
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fi
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}
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STAGE=0
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function msg_banner()
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{
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STAGE=`expr $STAGE + 1`
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echo ""
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echo "+---------------------------------------------+"
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printf " Stage $STAGE: $1\n"
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echo "+---------------------------------------------+"
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echo ""
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}
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function generate_image()
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{
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# FAT32 boot partition start/end address in MB
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BOOT_START=${UBOOT_SIZE}
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BOOT_END=`expr ${BOOT_START} + ${BOOT_SIZE}`
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msg_banner " <${STAGE}> 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 ${IMAGE_NAME}
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msg_banner " <${STAGE}> 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 ${BOOT_END}M 100%
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sync
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}
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function format_partition()
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{
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msg_banner " <${STAGE}> 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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msg_banner " <${STAGE}> Format system image partition"
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mkfs.vfat /dev/mapper/${LOOP_DEV}p1
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mkfs.ext4 /dev/mapper/${LOOP_DEV}p2
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sync
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}
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function install_sysimg()
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{
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msg_banner " <${STAGE}> 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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msg_banner " <${STAGE}> 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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set -x
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cp ${IMG_KERNEL} ${MNT_POINT}
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cp ${IMG_DTB} ${MNT_POINT}
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sync
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set +x
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umount ${MNT_POINT}
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}
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function install_rootfs()
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{
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msg_banner " <${STAGE}> Install root filesystem "
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if [ ! -f ${ROOTFS_TAR} ] ; then
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echo "ERROR: rootfs tarball file '${ROOTFS_TAR}' not exist..."
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exit ;
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fi
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mount -t ext4 /dev/mapper/${LOOP_DEV}p2 ${MNT_POINT}
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tar -xjf ${ROOTFS_TAR} -C ${MNT_POINT} && sync
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umount ${MNT_POINT}
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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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cp ${IMG_UBOOT} .
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bzip2 ${IMAGE_NAME}
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rm -rf ${MNT_POINT}
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