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#!/bin/sh -e
# SPDX-License-Identifier: GPL-2.0-only
#
# Create eMMC block device image from boot, RPMB and user data images
#
# Copyright (c) Siemens, 2025
#
# Authors:
# Jan Kiszka <jan.kiszka@siemens.com>
#
usage() {
echo "$0 [OPTIONS] USER_IMG[:SIZE] OUTPUT_IMG"
echo ""
echo "SIZE must be a power of 2 up to 2G and multiples of 512 byte from there on."
echo "If no SIZE is specified, the size of USER_ING will be used (rounded up)."
echo ""
echo "Supported options:"
echo " -b BOOT1_IMG[:SIZE] Add boot partitions. SIZE must be multiples of 128K. If"
echo " no SIZE is specified, the size of BOOT1_IMG will be"
echo " used (rounded up). BOOT1_IMG will be stored in boot"
echo " partition 1, and a boot partition 2 of the same size"
echo " will be created as empty (all zeros) unless -B is"
echo " specified as well."
echo " -B BOOT2_IMG Fill boot partition 2 with BOOT2_IMG. Must be combined"
echo " with -b which is also defining the partition size."
echo " -r RPMB_IMG[:SIZE] Add RPMB partition. SIZE must be multiples of 128K. If"
echo " no SIZE is specified, the size of RPMB_IMG will be"
echo " used (rounded up)."
echo " -h, --help This help"
echo ""
echo "All SIZE parameters support the units K, M, G. If SIZE is smaller than the"
echo "associated image, it will be truncated in the output image."
exit "$1"
}
process_size() {
name=$1
image_file=$2
alignment=$3
image_arg=$4
if [ "${image_arg#*:}" = "$image_arg" ]; then
if ! size=$(wc -c 2>/dev/null < "$image_file"); then
echo "Missing $name image '$image_file'." >&2
exit 1
fi
if [ "$alignment" = 128 ]; then
size=$(( (size + 128 * 1024 - 1) & ~(128 * 1024 - 1) ))
elif [ $size -gt $((2 * 1024 * 1024 * 1024)) ]; then
size=$(( (size + 511) & ~511 ))
elif [ $(( size & (size - 1) )) -gt 0 ]; then
n=0
while [ "$size" -gt 0 ]; do
size=$((size >> 1))
n=$((n + 1))
done
size=$((1 << n))
fi
else
value="${image_arg#*:}"
if [ "${value%K}" != "$value" ]; then
size=${value%K}
multiplier=1024
elif [ "${value%M}" != "$value" ]; then
size=${value%M}
multiplier=$((1024 * 1024))
elif [ "${value%G}" != "$value" ]; then
size=${value%G}
multiplier=$((1024 * 1024 * 1024))
else
size=$value
multiplier=1
fi
# check if "$size" is a valid integer by doing a self-comparison
if [ "$size" -eq "$size" ] 2>/dev/null; then
size=$((size * multiplier))
else
echo "Invalid value '$value' specified for $image_file image size." >&2
exit 1
fi
if [ "$alignment" = 128 ]; then
if [ $(( size & (128 * 1024 - 1) )) -ne 0 ]; then
echo "The $name image size must be multiples of 128K." >&2
exit 1
fi
elif [ $size -gt $((2 * 1024 * 1024 * 1024)) ]; then
if [ $(( size & 511)) -ne 0 ]; then
echo "The $name image size must be multiples of 512 (if >2G)." >&2
exit 1
fi
elif [ $(( size & (size - 1) )) -gt 0 ]; then
echo "The $name image size must be power of 2 (up to 2G)." >&2
exit 1
fi
fi
echo $size
}
check_truncation() {
image_file=$1
output_size=$2
if [ "$image_file" = "/dev/zero" ]; then
return
fi
if ! actual_size=$(wc -c 2>/dev/null < "$image_file"); then
echo "Missing image '$image_file'." >&2
exit 1
fi
if [ "$actual_size" -gt "$output_size" ]; then
echo "Warning: image '$image_file' will be truncated on output."
fi
}
userimg=
outimg=
bootimg1=
bootimg2=/dev/zero
bootsz=0
rpmbimg=
rpmbsz=0
while [ $# -gt 0 ]; do
case "$1" in
-b)
shift
[ $# -ge 1 ] || usage 1
bootimg1=${1%%:*}
bootsz=$(process_size boot "$bootimg1" 128 "$1")
shift
;;
-B)
shift
[ $# -ge 1 ] || usage 1
bootimg2=$1
shift
;;
-r)
shift
[ $# -ge 1 ] || usage 1
rpmbimg=${1%%:*}
rpmbsz=$(process_size RPMB "$rpmbimg" 128 "$1")
shift
;;
-h|--help)
usage 0
;;
*)
if [ -z "$userimg" ]; then
userimg=${1%%:*}
usersz=$(process_size user "$userimg" U "$1")
elif [ -z "$outimg" ]; then
outimg=$1
else
usage 1
fi
shift
;;
esac
done
[ -n "$outimg" ] || usage 1
if [ "$bootsz" -gt $((32640 * 1024)) ]; then
echo "Boot image size is larger than 32640K." >&2
exit 1
fi
if [ "$rpmbsz" -gt $((16384 * 1024)) ]; then
echo "RPMB image size is larger than 16384K." >&2
exit 1
fi
echo "Creating eMMC image"
truncate -s 0 "$outimg"
pos=0
if [ "$bootsz" -gt 0 ]; then
echo " Boot partition 1 and 2: $((bootsz / 1024))K each"
blocks=$(( bootsz / (128 * 1024) ))
check_truncation "$bootimg1" "$bootsz"
dd if="$bootimg1" of="$outimg" conv=sparse bs=128K count=$blocks \
status=none
check_truncation "$bootimg2" "$bootsz"
dd if="$bootimg2" of="$outimg" conv=sparse bs=128K count=$blocks \
seek=$blocks status=none
pos=$((2 * bootsz))
fi
if [ "$rpmbsz" -gt 0 ]; then
echo " RPMB partition: $((rpmbsz / 1024))K"
blocks=$(( rpmbsz / (128 * 1024) ))
check_truncation "$rpmbimg" "$rpmbsz"
dd if="$rpmbimg" of="$outimg" conv=sparse bs=128K count=$blocks \
seek=$(( pos / (128 * 1024) )) status=none
pos=$((pos + rpmbsz))
fi
if [ "$usersz" -lt 1024 ]; then
echo " User data: $usersz bytes"
elif [ "$usersz" -lt $((1024 * 1024)) ]; then
echo " User data: $(( (usersz + 1023) / 1024 ))K ($usersz)"
elif [ "$usersz" -lt $((1024 * 1024 * 1024)) ]; then
echo " User data: $(( (usersz + 1048575) / 1048576))M ($usersz)"
else
echo " User data: $(( (usersz + 1073741823) / 1073741824))G ($usersz)"
fi
check_truncation "$userimg" "$usersz"
dd if="$userimg" of="$outimg" conv=sparse bs=128K seek=$(( pos / (128 * 1024) )) \
count=$(( (usersz + 128 * 1024 - 1) / (128 * 1024) )) status=none
pos=$((pos + usersz))
truncate -s $pos "$outimg"
echo ""
echo "Instantiate by appending to the qemu command line:"
echo " -drive file=$outimg,if=none,format=raw,id=emmc-img"
echo " -device emmc,boot-partition-size=$bootsz,rpmb-partition-size=$rpmbsz,drive=emmc-img"
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