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+# uDPU uses combined ext4 and f2fs partitions.
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+# partition layout:
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+# 1. boot (ext4)
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+# 2. recovery (ext4)
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+# 3. rootfs (f2fs)
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+# 4. misc (f2fs)
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+
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+# Check which device is available, depending on the board revision
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+if [ -b "/dev/mmcblk1" ]; then
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+ emmc_dev=/dev/mmcblk1
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+elif [ -b "/dev/mmcblk0" ]; then
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+ emmc_dev=/dev/mmcblk0
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+else
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+ echo "Cannot detect eMMC flash, aborting.."
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+ exit 1
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+fi
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+
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+part_prep() {
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+ if [ "$(grep $1 /proc/mounts)" ]; then
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+ mounted_part="$(grep $1 /proc/mounts | awk '{print $2}' | head -1)"
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+ umount $mounted_part
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+ [ "$(grep -wo $mounted_part /proc/mounts)" ] && umount -l $mounted_part
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+ fi
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+}
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+
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+do_part_check() {
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+ local emmc_parts="1 2 3 4"
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+ local part_valid="1"
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+
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+ # Check if the block devices exist
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+ for num in ${emmc_parts}; do
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+ [[ ! -b ${emmc_dev}p${num} ]] && part_valid="0"
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+ done
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+
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+ # If partitions are missing create a new partition table
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+ if [ "$part_valid" != "1" ]; then
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+ printf "Invalid partition table, creating a new one\n"
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+ printf "o\nn\np\n1\n\n+256M\nn\np\n2\n\n+256M\nn\np\n3\n\n+1536M\nn\np\n\n\nw\n" | fdisk -W always $emmc_dev > /dev/null 2>&1
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+
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+ # Format the /misc part right away as we will need it for the firmware
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+ printf "Formating /misc partition, this make take a while..\n"
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+ part_prep ${emmc_dev}p4
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+ mkfs.f2fs -q -l misc ${emmc_dev}p4
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+ [ $? -eq 0 ] && printf "/misc partition formated successfully\n" || printf "/misc partition formatting failed\n"
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+
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+ do_initial_setup
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+ else
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+ printf "Partition table looks ok\n"
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+ fi
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+}
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+
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+do_misc_prep() {
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+ if [ ! "$(grep -wo /misc /proc/mounts)" ]; then
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+ mkdir -p /misc
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+ mount ${emmc_dev}p4 /misc
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+
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+ # If the mount fails, try to reformat partition
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+ # Leaving possiblity for multiple iterations
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+ if [ $? -ne 0 ]; then
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+ printf "Error while mounting /misc, trying to reformat..\n"
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+
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+ format_count=0
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+ while [ "$format_count" -lt "1" ]; do
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+ part_prep ${emmc_dev}p4
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+ mkfs.f2fs -q -l misc ${emmc_dev}p4
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+ mount ${emmc_dev}p4 /misc
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+ if [ $? -ne 0 ]; then
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+ umount -l /misc
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+ printf "Failed while mounting /misc\n"
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+ format_count=$((format_count +1))
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+ else
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+ printf "Mounted /misc successfully\n"
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+ break
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+ fi
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+ done
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+ fi
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+ fi
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+}
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+
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+do_initial_setup() {
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+ # Prepare /recovery parition
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+ part_prep ${emmc_dev}p2
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+ mkfs.ext4 -q ${emmc_dev}p2 | echo y &> /dev/null
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+
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+ # Prepare /boot partition
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+ part_prep ${emmc_dev}p1
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+ mkfs.ext4 -q ${emmc_dev}p1 | echo y &> /dev/null
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+
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+ # Prepare /root partition
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+ printf "Formating /root partition, this may take a while..\n"
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+ part_prep ${emmc_dev}p3
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+ mkfs.f2fs -q -l rootfs ${emmc_dev}p3
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+ [ $? -eq 0 ] && printf "/root partition reformated\n"
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+}
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+
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+do_regular_upgrade() {
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+ # Clean /boot partition - mfks.ext4 is not available in chroot
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+ [ "$(grep -wo /boot /proc/mounts)" ] && umount /boot
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+ mkdir -p /tmp/boot
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+ mount ${emmc_dev}p1 /tmp/boot
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+ rm -rf /tmp/boot/*
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+
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+ # Clean /root partition - mkfs.f2fs is not available in chroot
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+ [ "$(grep -wo /dev/root /proc/mounts)" ] && umount /
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+ mkdir -p /tmp/rootpart
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+ mount ${emmc_dev}p3 /tmp/rootpart
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+ rm -rf /tmp/rootpart/*
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+}
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+
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+platform_do_upgrade_uDPU() {
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+ # Prepare and extract firmware on /misc partition
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+ do_misc_prep
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+
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+ [ -f "/misc/firmware" ] && rm -r /misc/firmware
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+ mkdir -p /misc/firmware
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+ tar xzf "$1" -C /misc/firmware/
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+
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+ do_regular_upgrade
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+
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+ printf "Updating /boot partition\n"
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+ tar xzf /misc/firmware/boot.tgz -C /tmp/boot
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+ [ $? -eq 0 ] && printf "/boot partition updated successfully\n" || printf "/boot partition update failed\n"
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+ sync
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+
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+ printf "Updating /root partition\n"
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+ tar xzf /misc/firmware/rootfs.tgz -C /tmp/rootpart
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+ [ $? -eq 0 ] && printf "/root partition updated successfully\n" || printf "/root partition update failed\n"
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+ sync
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+
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+ # Saving configuration files over sysupgrade
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+ platform_copy_config_uDPU
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+
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+ # Remove tmp mounts
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+ tmp_parts=$(grep "${emmc_dev}" /proc/mounts | awk '{print $2}')
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+ for part in ${tmp_parts}; do
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+ umount $part
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+ # Force umount is necessary
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+ [ "$(grep "${part}" /proc/mounts)" ] && umount -l $part
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+ done
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+
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+ # Sysupgrade complains about /tmp and /dev, so we can detach them here
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+ umount -l /tmp
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+ umount -l /dev
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+}
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+
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+platform_copy_config_uDPU() {
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+ # Config is saved on the /misc partition and copied on the rootfs after the reboot
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+ if [ -f "/tmp/sysupgrade.tgz" ]; then
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+ cp -f /tmp/sysupgrade.tgz /misc
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+ sync
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+ fi
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+}
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Vladimir Vid