Debug secure bootloader shows invalid app while secure bootloader shows valid app after programming board

RE: Debug secure bootloader shows invalid app while secure bootloader shows valid app after programming board

alberto. — Fri, 20 May 2022 12:05:28 GMT

Hi,

It seems that now it's working properly. Unfortunately, I'm not 100% sure what fixed it, but I think your suggestions worked in the end.

Thanks again.

RE: Debug secure bootloader shows invalid app while secure bootloader shows valid app after programming board

Vidar Berg — Thu, 19 May 2022 09:49:08 GMT

Sorry, but I'm a bit out of ideas. Have you tried to see if what happens if you use the same settings.hex with the "release" build? Also, are you able to share the debug version of the bootloader so I can try to reproduce the same here?

RE: Debug secure bootloader shows invalid app while secure bootloader shows valid app after programming board

alberto. — Thu, 19 May 2022 06:34:17 GMT

Hi,

I used the commands

nrfutil settings generate --family NRF52840 --application _build/nrf52840_xxaa.hex --application-version 1 --bootloader-version 1 --bl-settings-version 2 settings.hex
nrfjprog --program settings.hex --sectorerase -r

to program the new bootloader settings and still got the same warning

<warning> nrf_dfu_settings: Resetting bootloader settings since neither the settings page nor the backup are valid (CRC error).

RE: Debug secure bootloader shows invalid app while secure bootloader shows valid app after programming board

Vidar Berg — Wed, 18 May 2022 13:58:28 GMT

Hi,

I'm surprised it says the settings page is invalid. The correct command for you SDK version should be (--app-boot-validation defaults to VALIDATE_GENERATED_CRC anyway):

nrfutil settings generate --family NRF52840 --application $(OUTPUT_DIRECTORY)/nrf52840_xxaa.hex --application-version 1 --bootloader-version 1 --bl-settings-version 2 settings.hex

Here i omitted the --no-backup argument and set the settings version to '2' as required for this SDK version you are using.

Could you please try with the command above again and program the settings.hex with the nrfjprog command below?

$ nrfjprog --program settings.hex --sectorerase -r

RE: Debug secure bootloader shows invalid app while secure bootloader shows valid app after programming board

alberto. — Wed, 18 May 2022 12:09:18 GMT

Hi Vidar,

In order to generate the bootloader settings I have been using the command

nrfutil settings generate --family NRF52840 --application $(OUTPUT_DIRECTORY)/nrf52840_xxaa.hex --application-version 1 --bootloader-version 1 --bl-settings-version 1 --no-backup settings.hex

So I have not been including the flag --app-boot-validation VALIDATE_GENERATED_CRC before.

I have tried to include this flag which required to change --bl-settings-version from 1 to 2 but I still get the same error. Removing the --no-backup flag didn't change the outcome either.

The logs show that the setting page is not valid.

<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.
<warning> nrf_dfu_settings: Resetting bootloader settings since neither the settings page nor the backup are valid (CRC error).

RE: Debug secure bootloader shows invalid app while secure bootloader shows valid app after programming board

Vidar Berg — Wed, 18 May 2022 11:27:18 GMT

Hi,

Any chance the image checksum validation may have been disabled in the "release" version? When programming everything through the debug interface you normally have to include the bootloader settings page (Generating and displaying bootloader settings) to mark the application as valid. The bootloader will always fall back to DFU mode if it is unable to validate the application.

nrfutil settings generate --family NRF52840 \
 --application $application_hex \
 --application-version-string $version \
 --bootloader-version 2 \
 --bl-settings-version 2 \
 --app-boot-validation VALIDATE_GENERATED_CRC \
 v$version/hex/bl_settings.hex

Best regards,

Vidar