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  • Case ID: 342558
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Timeout exit from the boot loader

DX_HK

I am developing an application that uses NCS2.8.0.

For FW updates, the nRF52833 USB ACM bootloader is enabled.

However, there are some problem.

My device has a battery but no reset button, so the application cannot start unless I reset it with mcumgr.

Since we do not want to unnecessarily expose the bootloader to users, bootloader startup cannot be used at any time.

The bootloader timeout seems to only be effective if the bootloader always starts after a reset.

Is it possible to only enable the bootloader timeout?
Or can I exit the bootloader by other means (e.g. user switch)?
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  • 0

    Hello,

    Please correct me if I'm wrong, but is my understanding correct that you're fine with the bootloader always enter serial recovery mode on startup, but you prefer not to expose any mcumgr commands in the application?

    Thanks,

    Vidar

  • 0 in reply to Vidar Berg

    No, I don't want the bootloader to start during normal boot.

    In other words, the bootloader will only start with
    bootmode_set(BOOT_MODE_TYPE_BOOTLOADER);

  • 0 in reply to Vidar Berg

    Is there a way to exit mcuboot using a button (not the reset button)?

  • 0 in reply to DX_HK

    It is possible, but this is also something that will require customization of the bootloader.

  • 0 in reply to Vidar Berg

    The bootloader is provided by NCS.
    I don't think it's that difficult to customize the code,
    but if I want to customize NCS, how should I change it?

  • 0 in reply to DX_HK

    I would start by just making changes directly to the main.c file for the bootloader in the SDK tree /v2.8.0/bootloader/mcuboot/boot/zephyr/ to verify that your changes work. You can then decide how you want to include these changes into your project setup. 

  • 0 in reply to Vidar Berg

    Thank you. I have performed a test implementation and it is working properly.

    This bootloader timeout feature seems more commonly needed.
    This time, I customized the bootloader, but customization by general users is not a good thing.
    I think such basic functions should be selectable without modifying the code.

    What should we do if multiple people are developing this custom bootloader?
    Specifically, there are several engineers in the company who develop using Zephyr, and the bootloader should be common, so this change should be synchronized via git (github).

    For example, would it be possible for us to create a fork of NCS and use that instead of the nordic repository?


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  • 0 in reply to Vidar Berg

    Thank you. I have performed a test implementation and it is working properly.

    This bootloader timeout feature seems more commonly needed.
    This time, I customized the bootloader, but customization by general users is not a good thing.
    I think such basic functions should be selectable without modifying the code.

    What should we do if multiple people are developing this custom bootloader?
    Specifically, there are several engineers in the company who develop using Zephyr, and the bootloader should be common, so this change should be synchronized via git (github).

    For example, would it be possible for us to create a fork of NCS and use that instead of the nordic repository?


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