openwrt/target/linux/layerscape/image/gen_sdcard_head_img.sh

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright 2018 NXP

set -x
[ $# -eq 5 ] || {
    echo "SYNTAX: $0 <file> <kernel part offset> <kernel size> <rootfs part offset> <rootfs size>"
    exit 1
}

OUTPUT="$1"
KERNELOFFSET="$(($2 * 1024))"
KERNELSIZE="$3"
ROOTFSOFFSET="$(($4 * 1024))"
ROOTFSSIZE="$5"

head=4
sect=63

set $(ptgen -o $OUTPUT -h $head -s $sect -t 83 -p ${KERNELSIZE}M@${KERNELOFFSET} -p ${ROOTFSSIZE}M@${ROOTFSOFFSET})