Not able to enter in DFU mode after creating a new project based on secure boot

RE: Not able to enter in DFU mode after creating a new project based on secure boot

Sigurd — Fri, 11 Feb 2022 14:19:06 GMT

[quote user="R_S"]If i comment the portion before app_start(vector_table_addr); then the issue get resolved. [/quote]

Good!

[quote user="R_S"]How flash protect can cause this issue..?[/quote]

You seem to be protecting the bootloader settings page as well. This way, bootloader2 won't be able to update the bootloader settings page when it does the DFU, and the DFU will fail.

RE: Not able to enter in DFU mode after creating a new project based on secure boot

R_S — Wed, 09 Feb 2022 13:18:09 GMT

i have two bootloaders. bootloader 1 and bootloader 2.

the flashing sequence is like ->MBR->Softdevice->Bootloader1->Bootloader2 ->Application code

Bootloader 1 start address -- 0x000E8000 to ECFFF

Bootloader 2 start Address --0x000ED000 to FDFFF
Application Start Address -- 0x00027000

Bootloader 1 is used for Bootloader 2 signature verification and bootloader 2 is responsible for DFU activity.

in Bootloader 1 i found that some portion of code creating this issue

void nrf_bootloader_app_start_final(uint32_t vector_table_addr)
{
    ret_code_t ret_val;

    // Size of the flash area to protect.
    uint32_t area_size;

    area_size = BOOTLOADER_SIZE + NRF_MBR_PARAMS_PAGE_SIZE;
    if (!NRF_BL_DFU_ALLOW_UPDATE_FROM_APP && !NRF_BL_DFU_ENTER_METHOD_BUTTONLESS && !NRF_DFU_TRANSPORT_BLE)
    {
        area_size += BOOTLOADER_SETTINGS_PAGE_SIZE;
    }

    ret_val = nrf_bootloader_flash_protect(BOOTLOADER_START_ADDR, area_size);

    if (ret_val != NRF_SUCCESS)
    {
        NRF_LOG_ERROR("Could not protect bootloader and settings pages, 0x%x.", ret_val);
    }
    APP_ERROR_CHECK(ret_val);

    ret_val = nrf_bootloader_flash_protect(0,
                    nrf_dfu_bank0_start_addr() + ALIGN_TO_PAGE(s_dfu_settings.bank_0.image_size));

    if (ret_val != NRF_SUCCESS)
    {
        NRF_LOG_ERROR("Could not protect SoftDevice and application, 0x%x.", ret_val);
    }
    APP_ERROR_CHECK(ret_val);

    // Run application
    app_start(vector_table_addr);
}

If i comment the portion before app_start(vector_table_addr); then the issue get resolved.

But i am not able to understand it why.

How flash protect can cause this issue..?

This portion is realted to the bootloader 1 and i am facing issue in bootloader2 . is it because flash protect function accessing more size i think in this case include bootloader size as well..?

Regards

R_S

RE: Not able to enter in DFU mode after creating a new project based on secure boot

Sigurd — Wed, 09 Feb 2022 11:11:34 GMT

Hi,

[quote user=""]But when i am flashing that code then its not entering to DFU mode.[/quote]

What did you flash? SoftDevice and the bootloader?

[quote user=""]I created a new project in IAR 8.50 and replicate project for sceure_bootloader in new project by adding files manually and include path and all.[/quote]

Does it work with the original secure_bootloader project?