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  • Case ID: 296020
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BLE DFU softdevice loading issue in bootloader

Sebastiaan

I've been trying to setup BLE DFU bootloading for my nrf52840, using this tutorial:
https://novelbits.io/nrf52-ota-dfu-ble-part-4/

I've come a long way, I've created an blinky app which works button less. 
also setup the bootloader which includes my public key.

Using the nrfConnect app I can initiate the DFU bootloader only to get it into an infinite bootloop.

To diagnose a bit further I hooked on the debugger and setup the booloader to print the debug logs to its uarts.

I can trace the issue currently to the initialization of the softdevice.

in function "ble_stack_init"

err_code = nrf_dfu_mbr_init_sd();
VERIFY_SUCCESS(err_code);

Gets executed and I am always rewarded with an return code: 7

This is where the bootloader resets.


If I disable the initialization by setting NRF_DFU_BLE_SKIP_SD_INIT=1
the next function "nrf_sdh_enable_request();" returns 1
and the bootloader also resets.

Does anyone have a clue what I am doing wrong?
I've been at this for days without any real progress.

I know the softdevice must work, otherwise the blinky application would not be able to communicate with the nrfConnect app

Attached below is a small snippet of the Application + bootloader logs

<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Running nrf_bootloader_app_start with address: 0x00001000
<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
<info> app: Setting vector table to bootloader: 0x000ED000
<info> app: Setting vector table to main app: 0x00027000
<info> app_timer: RTC: initialized.
<info> app: Blinky. V4.0
<info> app: USBD CDC ACM example started.
<info> app: No USB power detection enabled
Starting USB now
<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Running nrf_bootloader_app_start with address: 0x00001000
<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
<info> app: Setting vector table to bootloader: 0x000ED000
<info> app: Setting vector table to main app: 0x00027000
<info> app_timer: RTC: initialized.
<info> app: Blinky. V4.0
<info> app: USBD CDC ACM example started.
<info> app: No USB power detection enabled
Starting USB now
<info> app: Connected
<info> app: Device is preparing to enter bootloader mode

<info> app: Device will enter bootloader mode

<info> app: Power management wants to reset to DFU mode.
<info> app: Power management allowed to reset to DFU mode.
<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<debug> app: DFU mode requested via GPREGRET.
<info> nrf_bootloader_wdt: WDT is not enabled
<debug> app: in weak nrf_dfu_init_user
<debug> app: timer_stop (0x200059A0)
<debug> app: timer_activate (0x200059A0)
<info> app: Entering DFU mode.
<debug> app: Initializing transports (found: 1)
<debug> nrf_dfu_ble: Initializing BLE DFU transport
<debug> app: Failed to initialize transport 0, error 7
<error> app: Could not initalize DFU transport: 0x00000007
<error> app: Received an error: 0x00000003!
<info> app: Inside main
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> app: App is valid
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Running nrf_bootloader_app_start with address: 0x00001000
<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
<info> app: Setting vector table to bootloader: 0x000ED000
<info> app: Setting vector table to main app: 0x00027000
<info> app_timer: RTC: initialized.
<info> app: Blinky. V4.0
<info> app: USBD CDC ACM example started.
<info> app: No USB power detection enabled
Starting USB now

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  • 0 in reply to Sebastiaan

    Hi Sebastiaan,

    Thank you for the file. It seems the secure bootloader hex is at some very different addresses compare to mine. Mine doesn't work very well on the PCA10056 though, so it is probably not a very good reference point.
    As the Secure Bootloader is likely the part having problem, do you mind giving me your project files as well? If you can, please zip up just the folder that contains main.c and without the Output folders.

    Unfortunately, the backlog situation has arisen once more, so I might take a while to be back. I will be back latest by Tuesday though.
    Is this currently urgent for you? So that I can give some proper priority.

    If you wish to have some progress while waiting, my colleague Hung Bui recommends a blog of his:  Getting started with Nordic's Secure DFU bootloader, a step by step guide 

    Best regards,

    Hieu

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