Bootloader upgrade process

amalle · September 9, 2024, 2:19pm

Hi,

I am in the process of upgrading from zeus to kirkstone.
My new image now works correctly when installing it from scratch on a device, even mender updades from new versions are good.
But I have devices in the wild with the old zeus version and the old bootloader build (u-boot) is not compatible with the new version of the image.

The process of update seams simple :

Create a zeus image that we can mender update with the bootloader (lets call this version AA)
Pack the new bootloader (compatible with zeus images) and upgrade the bootloader creating an intermediate version (lets call it version BA)
Upgrade the rootfs to the new kirkstone image giving us BB the image we wanted all allong

However, I can’t figure out how to upgrade the bootloader.

My approach :
Install from scratch version BA (or version BB) and create a binary of the bootloader :

dd if=/dev/mmcblk2boot0 of=backup_mmcblk2boot0.bin
dd if=/dev/mmcblk2boot1 of=backup_mmcblk2boot1.bin

On a AA version overide the bootloader with the BA one :

echo 0 > /sys/block/mmcblk2boot0/force_ro
dd if=backup_mmcblk2boot0.bin of=/dev/mmcblk2boot0
sync
echo 1 > /sys/block/mmcblk2boot0/force_ro
echo 0 > /sys/block/mmcblk2boot1/force_ro
dd if=backup_mmcblk2boot1.bin of=/dev/mmcblk2boot1 bs=128
sync
echo 1 > /sys/block/mmcblk2boot1/force_ro
reboot

My results :
When booting u-boot logs show the new version

U-Boot 2022.04-lf_v2022.04+g333abc82094 (Sep 06 2024 - 08:27:05 +0000)

It’s actually not the new version, the rest of the logs like mmcboot command logs don’t mach the new version…

I have a bunch more logs and informations. I’ll keep it short to start with.

What I’m I missing ?
Thanks

TheYoctoJester · September 9, 2024, 2:49pm

Hi @amalle,

Just so I understand it correctly. The problem at the moment is about how to get the new bootloader version into flash on a live device, not about how to automate it with Mender yet, right?

My first question would be on the flash technology involved. Is it NAND or NOR? Why dd, and not the matching tool from mid-utils, like flashcp or nandwrite? Additionally, does reading back the newly flashed loader yield the correct binary?

Plus, what parts are involved in the boot chain? Is there maybe some secondary loader?

In general, more details on the specific hardware would be helpful.

Greets,
Josef

amalle · September 9, 2024, 3:24pm

Hi @TheYoctoJester,
Thank you for your quick response.

We have a SOM with an imx8mm on it with emmc.

You understood correctly, I’m looking to have a working “manual” update before automating it with Mender.

The flash is eMMC.
I guess dd was used because it was the one available on the image.
The flash of the bootloader seams to work properly :

$ dd if=/dev/mmcblk2boot0 of=backup_mmcblk2boot0_AA.bin
4096+0 records in
4096+0 records out
$ md5sum /dev/mmcblk2boot0
9cc18b40c567ac6e4ee69d1db384370c  /dev/mmcblk2boot0
$ md5sum backup_mmcblk2boot0_AA.bin
9cc18b40c567ac6e4ee69d1db384370c  backup_mmcblk2boot0_AA.bin
$ dd if=/dev/mmcblk2boot1 of=backup_mmcblk2boot1_AA.bin
4096+0 records in
4096+0 records out
$ md5sum /dev/mmcblk2boot1
b2d1236c286a3c0704224fe4105eca49  /dev/mmcblk2boot1
$ md5sum backup_mmcblk2boot1_AA.bin 
b2d1236c286a3c0704224fe4105eca49  backup_mmcblk2boot1_AA.bin

## Updating

$ echo 0 > /sys/block/mmcblk2boot0/force_ro
$ dd if=mmcblk2boot0_BA.bin of=/dev/mmcblk2boot0
4096+0 records in
4096+0 records out
$ sync
$ echo 1 > /sys/block/mmcblk2boot0/force_ro
$ md5sum mmcblk2boot0_BA.bin
a8c0d8eeddabfd35aa0fd0d704786bef  mmcblk2boot0_BA.bin
$ md5sum /dev/mmcblk2boot0
a8c0d8eeddabfd35aa0fd0d704786bef  /dev/mmcblk2boot0
$ echo 0 > /sys/block/mmcblk2boot1/force_ro
$ dd if=mmcblk2boot1_BA.bin of=/dev/mmcblk2boot1
4096+0 records in
4096+0 records out
$ sync
$ echo 1 > /sys/block/mmcblk2boot1/force_ro
$ md5sum mmcblk2boot1_BA.bin
b2d1236c286a3c0704224fe4105eca49  mmcblk2boot1_BA.bin
$ md5sum /dev/mmcblk2boot1
b2d1236c286a3c0704224fe4105eca49  /dev/mmcblk2boot1

I’m not sure about that secondary loader / bootchain.
How can I check for that ?

I don’t know if that helps but the mender patch is pretty straightforward :

TheYoctoJester · September 9, 2024, 3:28pm

@amalle, got it. I have a suspicion. What is the size of the binary that you’re flashing to the boot sectors there?

Greets,
Josef

amalle · September 10, 2024, 9:35am

@TheYoctoJester .bin files are 2 MB each

TheYoctoJester · September 10, 2024, 12:47pm

@amalle ok, then something is at least a bit off.

The iMX8s which I have worked on usually require an SPL to be in the boot sector, and the full u-boot binary to be located on the FAT-formatted boot partition. This full binary requires the RAM, clocks and storage to be already initialized. So this is what the SPL does, before loading and jumping to full u-boot.

My guess is that you are just swapping out the SPL, which gives you the new version string, but the jumps into the old u-boot which it loads from the partition. Without knowing the board configuration and metadata in use, I can’t say anything more detailed, but my advice therefore is to really look at the u-boot binaries which are produced, and then replicate the full provisioning process, not just a single file.

Greets,
Josef

amalle · September 11, 2024, 2:23pm

Ok I see.

What I find somewhat weird it that the difference when installing from scratch (using uuu) is the imx-boot file and it’s size is lower than 2MB. Changing this file give me a fully working and updated u-boot (and SPL probably).

Anyway I when further and here are some more information :

Same for results on AA/BA/BB :

$ fdisk -l /dev/mmcblk2
Disk /dev/mmcblk2: 3616 MB, 3791650816 bytes, 7405568 sectors
57856 cylinders, 4 heads, 32 sectors/track
Units: sectors of 1 * 512 = 512 bytes

Device       Boot StartCHS    EndCHS        StartLBA     EndLBA    Sectors  Size Id Type
/dev/mmcblk2p1 *  384,0,1     1023,3,32        49152     573439     524288  256M  c Win95 FAT32 (LBA)
/dev/mmcblk2p2    1023,3,32   1023,3,32       573440    2244607    1671168  816M 83 Linux
/dev/mmcblk2p3    1023,3,32   1023,3,32      2244608    3915775    1671168  816M 83 Linux
/dev/mmcblk2p4    1023,3,32   1023,3,32      3915776    4177919     262144  128M 83 Linux

Equivalent results between AA/BA :

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root               481704    353180     91332  79% /
devtmpfs                172140         0    172140   0% /dev
tmpfs                   501292         0    501292   0% /dev/shm
tmpfs                   501292     74608    426684  15% /run
tmpfs                   501292         0    501292   0% /sys/fs/cgroup
tmpfs                   501292         4    501288   0% /tmp
tmpfs                   501292         8    501284   0% /var/volatile
/dev/mmcblk2p1          261868        88    261780   0% /uboot
/dev/mmcblk2p4          122835      1600    112061   1% /data

$ ls -lah /uboot
drwxr-xr-x    2 root     root       16.0K Jan  1  1970 .
drwxr-xr-x   21 root     root        4.0K Apr 17  2023 ..
-rwxr-xr-x    1 root     root        6.2K Apr 17  2023 imx8mm_m4_TCM_hello_world.bin
-rwxr-xr-x    1 root     root       16.8K Apr 17  2023 imx8mm_m4_TCM_rpmsg_lite_pingpong_rtos_linux_remote.bin
-rwxr-xr-x    1 root     root       16.3K Apr 17  2023 imx8mm_m4_TCM_rpmsg_lite_str_echo_rtos.bin
-rwxr-xr-x    1 root     root       39.6K Apr 17  2023 imx8mm_m4_TCM_sai_low_power_audio.bin

Specific to BB :

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root               593852    429156    119056  78% /
devtmpfs                367472         0    367472   0% /dev
tmpfs                   500016         0    500016   0% /dev/shm
tmpfs                   200008     26056    173952  13% /run
tmpfs                     4096         0      4096   0% /sys/fs/cgroup
tmpfs                   500016         4    500012   0% /tmp
tmpfs                   500016        16    500000   0% /var/volatile
/dev/mmcblk2p1          261868     30916    230952  12% /uboot
/dev/mmcblk2p4          117203        64    107965   0% /data

$ ls -lah /uboot
drwxr-xr-x    2 root     root       16.0K Jan  1  1970 .
drwxr-xr-x   22 root     root        4.0K Sep  3 09:17 ..
-rwxr-xr-x    1 root     root       29.6M Apr  5  2011 Image
-rwxr-xr-x    1 root     root       47.5K Apr  5  2011 imx8mm-evk-8mic-revE.dtb
-rwxr-xr-x    1 root     root       47.9K Apr  5  2011 imx8mm-evk-8mic-swpdm.dtb
-rwxr-xr-x    1 root     root       45.6K Apr  5  2011 imx8mm-evk-ak4497.dtb
-rwxr-xr-x    1 root     root       44.9K Apr  5  2011 imx8mm-evk-ak5558.dtb
-rwxr-xr-x    1 root     root       45.0K Apr  5  2011 imx8mm-evk-audio-tdm.dtb
-rwxr-xr-x    1 root     root        3.1K Apr  5  2011 imx8mm-evk-inmate.dtb
-rwxr-xr-x    1 root     root       44.9K Apr  5  2011 imx8mm-evk-pcie-ep.dtb
-rwxr-xr-x    1 root     root       45.0K Apr  5  2011 imx8mm-evk-pu5xx.dtb
-rwxr-xr-x    1 root     root       45.1K Apr  5  2011 imx8mm-evk-qca-wifi.dtb
-rwxr-xr-x    1 root     root       45.1K Apr  5  2011 imx8mm-evk-revb-qca-wifi.dtb
-rwxr-xr-x    1 root     root       45.4K Apr  5  2011 imx8mm-evk-rm67191.dtb
-rwxr-xr-x    1 root     root       45.5K Apr  5  2011 imx8mm-evk-root.dtb
-rwxr-xr-x    1 root     root       46.2K Apr  5  2011 imx8mm-evk-rpmsg.dtb
-rwxr-xr-x    1 root     root       44.9K Apr  5  2011 imx8mm-evk-usd-wifi.dtb

It seams that we have a uboot partitition in the form of /dev/mmcblkp1
I’ve dd’ed /dev/mmcblkp1 from BB to AA and it didn’t change anything more.

So i’ve when into I.MX Linux User’s Guide and found the following :

That seams to match with your guess.
The imx-boot file is still ~1.5Mo and using it (with the seek offset) seams to give me the same results as dd’ing the /dev/mmcblk2boot0 from BA.

I feel like I am close… But still missing something ?

TheYoctoJester · September 11, 2024, 5:35pm

@amalle indeed close, but missing something. I’d now take a really close look at the image generation used in your builds, possibly the .wks files which define the resulting .wic image structure, because those definitely have to contain the logic on which piece goes where exactly.

Greets,
Josef

amalle · September 17, 2024, 10:27am

Hi again,

.wks is definitely a good lead :

# short-description: Create SD card image with a boot partition
# long-description:
# Create an image that can be written onto a SD card using dd for use
# with i.MX SoC family
# It uses u-boot + other binaries gathered together on imx-boot file
#
# The disk layout used is:
#  - ---------- -------------- --------------
# | | imx-boot |     boot     |    rootfs    |
#  - ---------- -------------- --------------
# ^ ^          ^              ^              ^
# | |          |              |              |
# 0 |        8MiB          72MiB          72MiB + rootfs + IMAGE_EXTRA_SPACE (default 10MiB)
#   33 32 or 33kiB, see reference manual
#
part u-boot --source rawcopy --sourceparams="file=imx-boot" --ondisk mmcblk --no-table --align 33
part /boot --source bootimg-partition --ondisk mmcblk --fstype=vfat --label boot --active --align 8192 --size 64
part / --source rootfs --ondisk mmcblk --fstype=ext4 --label root --align 8192

bootloader --ptable msdos

But, from there I’ve started to try to split work in 2 updating imx-boot and boot.

Taking a closer look to the difference between the imx-boot file and the dd’ed mmcblk2boot0 :

We can see that imx-boot starts at the address 0x008400 in mmcblk2boot0 not sure how that match with the 33kiB.

Length seams to match between imx-boot and mmcblk2boot0 (accounting the offset) but again not with the .wks for some reason ?

Both contain the modified uboot logs and script witch give me the impression I should be able to make it work by updating mmcblk2boot0.

I’ve tried to dump boot using dd on mmcblk2p1 but it’s mostly empty…

Going through the build files i’ve found xxx.testdata.json here are some the of the informations that seemed relevant :

    "IMAGE_OVERHEAD_FACTOR": "1.5",
    "IMAGE_ROOTFS_ALIGNMENT": "1",
    "IMAGE_ROOTFS_EXCLUDE_PATH": " data/ uboot/",
    "IMX_BOOT_SEEK": "33",
    "IMX_BOOT_SOC_TARGET": "iMX8MM",
    "IMX_DEFAULT_ATF_PROVIDER": "imx-atf",
    "IMX_DEFAULT_BOOTLOADER": "u-boot-imx",
    "MENDER_BOOT_PART": "/dev/mmcblk2p1",
    "MENDER_BOOT_PART_DEFAULT": "/dev/mmcblk2p1",
    "MENDER_BOOT_PART_DEFAULT:mender-ubi": "",
    "MENDER_BOOT_PART_FSOPTS": "",
    "MENDER_BOOT_PART_FSOPTS_DEFAULT": "",
    "MENDER_BOOT_PART_FSTAB_OPTS": "defaults,sync",
    "MENDER_BOOT_PART_FSTAB_OPTS_DEFAULT": "defaults,sync",
    "MENDER_BOOT_PART_FSTYPE": "auto",
    "MENDER_BOOT_PART_FSTYPE_DEFAULT": "auto",
    "MENDER_BOOT_PART_FSTYPE_TO_GEN": "vfat",
    "MENDER_BOOT_PART_FSTYPE_TO_GEN_DEFAULT": "vfat",
    "MENDER_BOOT_PART_LABEL": "boot",
    "MENDER_BOOT_PART_MOUNT_LOCATION": "/uboot",
    "MENDER_BOOT_PART_MOUNT_LOCATION:mender-grub:mender-bios": "/boot/grub",
    "MENDER_BOOT_PART_MOUNT_LOCATION:mender-systemd-boot": "/boot",
    "MENDER_BOOT_PART_MOUNT_LOCATION:mender-uboot": "/uboot",
    "MENDER_BOOT_PART_NUMBER": "1",
    "MENDER_BOOT_PART_NUMBER_DEFAULT": "1",
    "MENDER_BOOT_PART_NUMBER_DEFAULT:mender-ubi": "",
    "MENDER_BOOT_PART_SIZE_MB": "256",
    "MENDER_BOOT_PART_SIZE_MB_DEFAULT": "16",
    "MENDER_BOOT_PART_SIZE_MB_DEFAULT:mender-systemd-boot": "64",
    "MENDER_BOOT_PART_SIZE_MB_DEFAULT:mender-ubi": "0",
    "MENDER_CALC_ROOTFS_SIZE": "835584",
    "MENDER_CONFIGURATION_VARS": "    RootfsPartA     RootfsPartB     InventoryPollIntervalSeconds     RetryPollIntervalSeconds     ArtifactVerifyKey     ServerCertificate     ServerURL     UpdatePollIntervalSeconds",
    "MENDER_CONNECT_USER": "root",
    "MENDER_DATA_PART": "/dev/mmcblk2p4",
    "MENDER_DATA_PART_DEFAULT": "/dev/mmcblk2p4",
    "MENDER_DATA_PART_DEFAULT:mender-ubi": "/dev/mmcblk2p2",
    "MENDER_DATA_PART_FSOPTS": "",
    "MENDER_DATA_PART_FSOPTS_DEFAULT": "",
    "MENDER_DATA_PART_FSTAB_OPTS": "defaults",
    "MENDER_DATA_PART_FSTAB_OPTS_DEFAULT": "defaults",
    "MENDER_DATA_PART_FSTYPE": "auto",
    "MENDER_DATA_PART_FSTYPE_DEFAULT": "auto",
    "MENDER_DATA_PART_FSTYPE_DEFAULT:mender-ubi": "ubifs",
    "MENDER_DATA_PART_FSTYPE_TO_GEN": "ext4",
    "MENDER_DATA_PART_FSTYPE_TO_GEN_DEFAULT": "ext4",
    "MENDER_DATA_PART_LABEL": "data",
    "MENDER_DATA_PART_NUMBER": "4",
    "MENDER_DATA_PART_NUMBER_DEFAULT": "4",
    "MENDER_DATA_PART_SIZE_MB": "128",
    "MENDER_DATA_PART_SIZE_MB_DEFAULT": "128",
    "MENDER_DEVICE_TYPE": "awpu510",
    "MENDER_DEVICE_TYPES_COMPATIBLE": "awpu510",
    "MENDER_DEVICE_TYPES_COMPATIBLE_DEFAULT": "awpu510",
    "MENDER_DEVICE_TYPE_DEFAULT": "awpu510",
    "MENDER_DEVICE_TYPE_DEFAULT:beaglebone-yocto:mender-grub": "awpu510-grub",
    "MENDER_EFI_LOADER": "u-boot",
    "MENDER_EXTRA_PARTS": "",
    "MENDER_EXTRA_PARTS_TOTAL_SIZE_MB": "0",
    "MENDER_FEATURES": "mender-image mender-uboot mender-image-sd mender-client-install mender-auth-install mender-update-install",
    "MENDER_FEATURES_DISABLE": " mender-grub mender-image-uefi",
    "MENDER_FEATURES_ENABLE": "mender-image mender-uboot mender-image-sd mender-client-install",
    "MENDER_FLASH_MINIMUM_IO_UNIT": "512",
    "MENDER_IMAGE_BOOTLOADER_BOOTSECTOR_OFFSET": "2",
    "MENDER_IMAGE_BOOTLOADER_BOOTSECTOR_OFFSET_DEFAULT": "2",
    "MENDER_IMAGE_BOOTLOADER_BOOTSECTOR_OFFSET_DEFAULT:mender-grub:mender-bios:mender-image-bios": "1",
    "MENDER_IMAGE_BOOTLOADER_BOOTSECTOR_OFFSET_DEFAULT:mender-grub:mender-bios:mender-image-gpt": "34",
    "MENDER_IMAGE_BOOTLOADER_BOOTSECTOR_OFFSET_DEFAULT:mender-ubi": "0",
    "MENDER_IMAGE_BOOTLOADER_FILE": "",
    "MENDER_IMAGE_BOOTLOADER_FILE:imx8mnevk": "imx-boot",
    "MENDER_IMAGE_BOOTLOADER_FILE_DEFAULT": "",
    "MENDER_IMAGE_BOOTLOADER_FILE_DEFAULT:mender-grub:mender-bios": "grub-core.img",
    "MENDER_IMAGE_BOOTLOADER_FILE_DEFAULT:mender-ubi": "u-boot.bin",
    "MENDER_IMAGE_ROOTFS_MAXSIZE_DEFAULT:mender-ubi": "",
    "MENDER_IMAGE_ROOTFS_SIZE_DEFAULT": "835584",
    "MENDER_IS_ON_MTDID": "",
    "MENDER_MACHINE": "awpu510",
    "MENDER_MAXIMUM_LEB_COUNT": "1024",
    "MENDER_MBR_BOOTLOADER_FILE": "",
    "MENDER_MBR_BOOTLOADER_FILE_DEFAULT": "",
    "MENDER_MBR_BOOTLOADER_FILE_DEFAULT:mender-grub:mender-bios": "boot.img",
    "MENDER_MBR_BOOTLOADER_LENGTH": "446",
    "MENDER_MTDIDS": "",
    "MENDER_MTDPARTS": "",
    "MENDER_MTD_UBI_DEVICE_NAME": "",
    "MENDER_MTD_UBI_DEVICE_NAME_DEFAULT": "",
    "MENDER_MTD_UBI_DEVICE_NAME_DEFAULT:mender-ubi": "ubi",
    "MENDER_NAND_FLASH_PAGE_SIZE": "2048",
    "MENDER_PARTITIONING_OVERHEAD_KB": "16384",
    "MENDER_PARTITIONING_OVERHEAD_KB_DEFAULT": "16384",
    "MENDER_PARTITIONING_OVERHEAD_KB_DEFAULT:mender-ubi": "2129920",
    "MENDER_PARTITION_ALIGNMENT": "8388608",
    "MENDER_PARTITION_ALIGNMENT_DEFAULT": "8388608",
    "MENDER_PARTITION_ALIGNMENT_DEFAULT:mender-ubi": "8388608",
    "MENDER_PERSISTENT_CONFIGURATION_VARS": "RootfsPartA RootfsPartB",
    "MENDER_RESERVED_SPACE_BOOTLOADER_DATA": "16777216",
    "MENDER_RESERVED_SPACE_BOOTLOADER_DATA_DEFAULT": "16777216",
    "MENDER_RESERVED_SPACE_BOOTLOADER_DATA_DEFAULT:mender-uboot": "16777216",
    "MENDER_ROOTFS_PART_A": "/dev/mmcblk2p2",
    "MENDER_ROOTFS_PART_A_DEFAULT": "/dev/mmcblk2p2",
    "MENDER_ROOTFS_PART_A_NAME": "/dev/mmcblk2p2",
    "MENDER_ROOTFS_PART_A_NAME_DEFAULT": "/dev/mmcblk2p2",
    "MENDER_ROOTFS_PART_A_NAME_DEFAULT:mender-ubi": "/dev/mmcblk2:rootfsa",
    "MENDER_ROOTFS_PART_A_NUMBER": "2",
    "MENDER_ROOTFS_PART_A_NUMBER_DEFAULT": "2",
    "MENDER_ROOTFS_PART_A_NUMBER_DEFAULT:mender-ubi": "0",
    "MENDER_ROOTFS_PART_B": "/dev/mmcblk2p3",
    "MENDER_ROOTFS_PART_B_DEFAULT": "/dev/mmcblk2p3",
    "MENDER_ROOTFS_PART_B_NAME": "/dev/mmcblk2p3",
    "MENDER_ROOTFS_PART_B_NAME_DEFAULT": "/dev/mmcblk2p3",
    "MENDER_ROOTFS_PART_B_NAME_DEFAULT:mender-ubi": "/dev/mmcblk2:rootfsb",
    "MENDER_ROOTFS_PART_B_NUMBER": "3",
    "MENDER_ROOTFS_PART_B_NUMBER_DEFAULT": "3",
    "MENDER_ROOTFS_PART_B_NUMBER_DEFAULT:mender-ubi": "1",
    "MENDER_SERVER_URL": "https://hosted.mender.io",
    "MENDER_STATE_SCRIPTS_VERSION": "3",
    "MENDER_STORAGE_DEVICE": "/dev/mmcblk2",
    "MENDER_STORAGE_DEVICE_BASE": "/dev/mmcblk2p",
    "MENDER_STORAGE_DEVICE_BASE_DEFAULT": "/dev/mmcblk2p",
    "MENDER_STORAGE_DEVICE_BASE_DEFAULT:mender-ubi": "/dev/mmcblk2_",
    "MENDER_STORAGE_DEVICE_DEFAULT": "/dev/mmcblk0",
    "MENDER_STORAGE_DEVICE_DEFAULT:mender-ubi": "ubi0",
    "MENDER_STORAGE_PEB_SIZE": "8388608",
    "MENDER_STORAGE_TOTAL_SIZE_MB": "2048",
    "MENDER_STORAGE_TOTAL_SIZE_MB_DEFAULT": "1024",
    "MENDER_SWAP_PART_SIZE_MB": "0",
    "MENDER_SWAP_PART_SIZE_MB_DEFAULT": "0",
    "MENDER_UBI_LEB_PEB_BLOCK_OVERHEAD": "0",
    "MENDER_UBI_LEB_SIZE": "8388608",
    "MENDER_UBI_TOTAL_BAD_PEB_OVERHEAD": "0",
    "MENDER_UBI_TOTAL_FIXED_OVERHEAD": "33554432",
    "MENDER_UBI_TOTAL_LEB_PEB_OVERHEAD": "0",
    "MENDER_UBOOT_ENV_STORAGE_DEVICE_OFFSET": "8388608",
    "MENDER_UBOOT_ENV_UBIVOL_NUMBER_1": "3",
    "MENDER_UBOOT_ENV_UBIVOL_NUMBER_2": "4",
    "MENDER_UBOOT_POST_SETUP_COMMANDS": "",
    "MENDER_UBOOT_POST_SETUP_COMMANDS_DEFAULT": "",
    "MENDER_UBOOT_PRE_SETUP_COMMANDS": "",
    "MENDER_UBOOT_PRE_SETUP_COMMANDS_DEFAULT": "",
    "MENDER_UBOOT_STORAGE_DEVICE": "",
    "MENDER_UBOOT_STORAGE_DEVICE_DEFAULT": "",
    "MENDER_UBOOT_STORAGE_DEVICE_DEFAULT:mender-ubi": "dummy",
    "MENDER_UBOOT_STORAGE_INTERFACE": "",
    "MENDER_UBOOT_STORAGE_INTERFACE_DEFAULT": "",
    "MENDER_UBOOT_STORAGE_INTERFACE_DEFAULT:mender-ubi": "dummy",

That seems to confirm the partitions layout, the 33 KiB/KB/B/? offset.

I’m still missing something…

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