Multi-image DFU over BLE (nrf5340)

[powellluca]

I am a bit confused on how to perform multi-image DFU on nrf5340 using smpmgr. The Zephyr project is based on the example OTA application from the Nordic SDK.

I have so far been successful running OTA updates with just the application core image, using the following:

smpmgr --ble '11:22:33:44:55:66' upgrade --slot 2 ./app_update.bin
smpmgr --ble '11:22:33:44:55:66' image state-write <hash> true

However the Zephyr project contains an additional child image for the network core (net_core_app_update.bin) and I can't seem to find a way to include that image in the upgrade process. I tried uploading/upgrading separately to slot 4 with

smpmgr --ble '11:22:33:44:55:66' upgrade --slot 4 ./net_core_app_update.bin

But running this seems to overwrite whatever is in slot 1 of the device and confirming the net core image by the hash code does not work. Here's the ImageState after attempting to upgrade the network core:

ImageState(
    slot=1,
    version='1.1.1',
    image=None,
    hash=<hash code>,
    bootable=True,
    pending=False,
    confirmed=False,
    active=False,
    permanent=False
)

Perhaps I am interpreting the image numbers and slots incorrectly (#3), but I may have missed some KConfig options from the Nordic SDK docs. Any help here would be appreciated!

[powellluca]

Sharing OTA-related configurations from the prj.conf here for extra context:

# enable BLE OTA
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y


# c++
CONFIG_NEWLIB_LIBC_NANO=n
CONFIG_NEWLIB_LIBC=y
CONFIG_CPLUSPLUS=y
CONFIG_STD_CPP20=y
CONFIG_LIB_CPLUSPLUS=y
CONFIG_EXCEPTIONS=y
# CONFIG_LEGACY_INCLUDE_PATH=y
CONFIG_RING_BUFFER=y

# flash
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y
# CONFIG_USE_DT_CODE_PARTITION=y # offset
CONFIG_PM_PARTITION_SIZE_NVS_STORAGE=0x2000

# system
CONFIG_REBOOT=y
CONFIG_HWINFO=y
CONFIG_EVENTS=y
CONFIG_LOG=y
CONFIG_RESET_ON_FATAL_ERROR=y
CONFIG_FAULT_DUMP=2

# Board Config
CONFIG_PCD_APP=y
CONFIG_BOARD_ENABLE_CPUNET=y
CONFIG_PARTITION_MANAGER_ENABLED=y

# enable signed netcore fw build
CONFIG_NRF53_UPGRADE_NETWORK_CORE=y

# enable multi-image
CONFIG_DFU_MULTI_IMAGE=y

[JPHutchins]

The "upgrade" command is an abstraction of the DFU process and has not been tested with multiple images. I suggest using the "image upload" sub commands and using "image state-read" to get feedback.

Ultimately, before resetting, you should have:

• Slot 1: present app image
• Slot 2: new app image, marked pending
• Slot 3: present net image
• Slot 4: new net image, marked pending

I do have a 5340 handy, but I'm not sure when I'll have a chance to test and potentially update the "upgrade" command to take optional args for other images.