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start the first partition with a 32MiB "offset"

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Since Kickstart no longer has the '--start' and '--end' options for the
partition command, we need to do this manually.
3e655d4c5d

Why do we need to do this at all? Well, because some SoCs read U-Boot
from the boot media at a particular offset. Normally, the first
partition starts at 2048 (with fdisk) or at 8192 (if using Kickstart)
which means that something from the first partition will be erased, or
data written here will eventually overwrite U-Boot if U-Boot is greater
than 2MiB.

Looking at the biggest file in 'uboot-images-armv8' package, the biggest
file is ~12 MiB so the double of closest 2's exponent results in 32MiB.
This commit is contained in:
Pratham Patel 2023-10-16 09:21:42 +05:30
parent cbbee2dbbe
commit 2d2ee0a676
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1 changed files with 39 additions and 0 deletions
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39
create-image.sh
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@ -15,6 +15,41 @@ for COMMAND in "${COMMANDS_TO_CHECK[@]}"; do
fi
done
function create_new_image {
UBOOT_MAX_SIZE='32'
EFI_END=$(( 512 + UBOOT_MAX_SIZE ))
BOOT_START=$(( EFI_END + 1 ))
BOOT_END=$(( BOOT_START + 1024 ))
ROOT_START=$(( BOOT_END + 1 ))
IMAGE_SIZE=$(( $(stat -c '%s' "${IMAGE_NAME}") / 1024 / 1024 ))
NEW_IMAGE_NAME="${IMAGE_NAME}.new"
truncate -s "$(( IMAGE_SIZE + UBOOT_MAX_SIZE ))"MiB "${NEW_IMAGE_NAME}"
LOOPBACK_01=$(losetup -f -P --show "${IMAGE_NAME}")
LOOPBACK_02=$(losetup -f -P --show "${NEW_IMAGE_NAME}")
parted -s "${LOOPBACK_02}" mklabel gpt
parted -s "${LOOPBACK_02}" mkpart efi fat32 "${UBOOT_MAX_SIZE}"MiB "${EFI_END}"MiB
parted -s "${LOOPBACK_02}" mkpart boot ext4 "${BOOT_START}"MiB "${BOOT_END}"MiB
parted -s "${LOOPBACK_02}" mkpart root ext4 "${ROOT_START}"MiB 100%
parted -s "${LOOPBACK_02}" set 1 boot on
sync; sync; sync; sync;
sleep 10
hdparm -z "${LOOPBACK_02}"
dd bs=4M conv=sync status=progress if="${LOOPBACK_01}p1" if="${LOOPBACK_02}p1"
dd bs=4M conv=sync status=progress if="${LOOPBACK_01}p2" if="${LOOPBACK_02}p2"
dd bs=4M conv=sync status=progress if="${LOOPBACK_01}p3" if="${LOOPBACK_02}p3"
sync; sync; sync; sync;
sleep 10
losetup -d "${LOOPBACK_02}"
losetup -d "${LOOPBACK_01}"
mv "${NEW_IMAGE_NAME}" "${IMAGE_NAME}"
sync; sync; sync; sync;
sleep 10
}
appliance-creator \
--config "${KICKSTART_FILE}" \
--name "${APPLIANCE_NAME}" \
@ -28,6 +63,10 @@ appliance-creator \
if [[ -d "${APPLIANCE_NAME}" ]]; then
pushd "${APPLIANCE_NAME}" || exit 1
mv "${APPLIANCE_NAME}-sda.raw" "${IMAGE_NAME}"
create_new_image
zstd --compress -9 "${IMAGE_NAME}"
sha512sum -- *.raw* > SHA512SUMS
sha256sum -- *.raw* > SHA256SUMS
popd || exit 0
else
>&2 echo "$0: ERROR: unable to find the appliance output directory"