Hi Jan,
On 8/24/25 09:18, Jan Kiszka wrote: > From: Jan Kiszka <[email protected]> > > As an eMMC block device image may consist of more than just the user > data partition, provide a helper script that can compose the image from > boot partitions, an RPMB partition and the user data image. The script > also does the required size validation and/or rounding. > > Signed-off-by: Jan Kiszka <[email protected]> > --- > scripts/mkemmc.sh | 185 ++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 185 insertions(+) > create mode 100755 scripts/mkemmc.sh > > diff --git a/scripts/mkemmc.sh b/scripts/mkemmc.sh > new file mode 100755 > index 0000000000..5d40c2889b > --- /dev/null > +++ b/scripts/mkemmc.sh > @@ -0,0 +1,185 @@ > +#!/bin/sh -e > +# > +# Create eMMC block device image from boot, RPMB and user data images > +# > +# Copyright (c) Siemens, 2025 > +# > +# Authors: > +# Jan Kiszka <[email protected]> > +# > +# This work is licensed under the terms of the GNU GPL version 2. > +# See the COPYING file in the top-level directory. > +# > + > +usage() { > + echo "$0 [OPTIONS] USER_IMG[:SIZE] OUTPUT_IMG" > + echo "" > + echo "SIZE must be a power of 2. If no SIZE is specified, the size of > USER_ING will" > + echo "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 > BOOT_IMG will be" the size of BOOT1_IMG > + 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 "$1" > +} > + > +process_size() { > + if [ "${4#*:}" = "$4" ]; then > + if ! size=$(stat -L -c %s "$2" 2>/dev/null); then > + echo "Missing $1 image '$2'." >&2 > + exit 1 > + fi > + if [ "$3" = 128 ]; then > + size=$(( (size + 128 * 1024 - 1) & ~(128 * 1024 - 1) )) > + elif [ $(( size & (size - 1) )) -gt 0 ]; then > + n=0 > + while [ "$size" -gt 0 ]; do > + size=$((size >> 1)) > + n=$((n + 1)) > + done > + size=$((1 << n)) > + fi > + else > + value="${4#*:}" > + 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 > + if [ "$size" -eq "$size" ] 2>/dev/null; then > + size=$((size * multiplier)) > + else > + echo "Invalid value '$value' specified for $2 image size." >&2 > + exit 1 > + fi > + if [ "$3" = 128 ]; then > + if [ $(( size & (128 * 1024 - 1) )) -ne 0 ]; then > + echo "The $2 image size must be multiples of 128K." >&2 > + exit 1 > + fi > + elif [ $(( size & (size - 1) )) -gt 0 ]; then > + echo "The %2 image size must be power of 2." >&2 > + exit 1 > + fi > + fi > + echo $size > +} > + > +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" 2 "$1") > + elif [ -z "$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 Should we warn if BOOT1_IMG and/or BOOT2_IMG are truncated as a result of $bootsz being too small? I can see how providing a larger size can be useful to be able to later extend the filesystem, but a smaller size is more likely to indicate an error I suppose? > +if [ "$rpmbsz" -gt $((16384 * 1024)) ]; then > + echo "RPMB image size is larger than 16384K." >&2 > + exit 1 > +fi> + > +echo "Creating eMMC image" > + > +truncate "$outimg" -s 0 > +pos=0 > + > +if [ "$bootsz" -gt 0 ]; then > + echo " Boot partition 1 and 2: $((bootsz / 1024))K each" > + blocks=$(( bootsz / (128 * 1024) )) > + dd if="$bootimg1" of="$outimg" conv=sparse bs=128K count=$blocks \ > + status=none > + dd if="$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) )) > + 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 > +dd if="$userimg" of="$outimg" conv=sparse bs=128K seek=$(( pos / (128 * > 1024) )) \ > + count=$(( (usersz + 128 * 1024 - 1) / (128 * 1024) )) status=none > +pos=$((pos + usersz)) > +truncate "$outimg" -s $pos > + > +echo "" > +echo "Instantiate via '-device > emmc,boot-partition-size=$bootsz,rpmb-partition-size=$rpmbsz,drive=$outimg'" That did not work for me. I had to provide a drive name, not the image path. An also create PCIe and SDHCI devices. That is: -device pcie-root-port,id=pcie-root,bus=pcie.0 \ -device sdhci-pci,bus=pcie-root \ -device emmc,boot-partition-size=$bootsz,rpmb-partition-size=$rpmbsz,drive=mmc0 -drive if=none,id=mmc0,file=$outimg,format=raw" I applied the patches on top of QEMU 10.1.0 if that matters. Regards, -- Jerome
