Cannot update zip file after enabling dfu

[Vimalnath]

Hi,

I am using sdk_17 and nrf52810. I have build a bootloader from the examples folder(examples/dfu/secure_bootloader/pca10040e_S112_ble) for my device. After flashing, the device enters into dfu mode. When I select the required zip package from my phone for updating, it simple just gets disconnected. I am using the proper private and public keys for creating the files.

[Einar Thorsrud]

Hi,

Can you share the log from nRF Connect on mobile (or other), which could indicate the issue? It is sometimes also very useful to see the RTT log from the bootloader, but to get that you need to flash a debug bootloader project (example bootloader project with the suffix "_debug").

[Vimalnath]

The logs from my mobile app indicates->

[DFU]Remote DFU error:

EXTENDED ERROR

[DFU]Details: SD version failure

(code =7)

I have also checked the version of the softdevice(S112) its 0xc4.

"nrfutil pkg generate --hw-version 52 --application-version 1 --application ble_app_template_pca10040e_s112.hex --sd-req 0xc4 --key-file private.key app_dfu_package.zip"

This is the command that I have used to generate the zip file.

And I have also tried this nrf52832 EVK board as well, but the result remains the same.

[Vimalnath]

This is my project file->ses.rar. 

[Einar Thorsrud]

Hi,

Can you include everything used in the bootloader project, not just the project files itself? I am particularly interested in the bootloader's sdk_config.h, but other parts may also be relevant.

[Vimalnath]

oops.. my mistake. Complete project->nRF5_SDK_17.0.2_.zip.And can you tell me the use of Application data area present above the application layer. By default it takes 8kB from the flash. I tried to reduce it to 4kB. Then I was able to update the application zip file, but after the update the device is not responding. From the nrf document I came to know that the application data size should be a multiple of the flash page size, which is 4kB.

[Vimalnath]

go to->E:~\nRF5_SDK_17.0.2_\examples\dfu\secure_bootloader\pca10040e_s112_ble\ses for bootloader project.

And go to->~\nRF5_SDK_17.0.2_\examples\ble_peripheral\ble_app_buttonless_dfu\pca10040e\s112\ses for application project file.

[Einar Thorsrud]

Hi,

Thanks. I have tested your projects and see the same as you. Upgrade fails with an INSUFFICIENT RESOURCES error. This is unexpected, as the app clearly fits. I verified on a different project with a debug bootloader that putting data in the last available page before the app data reserved can work with the SDK 17 bootloader, and I do not see what is different in your case.

Debugging it is a bit difficult as it is a tight fit and the bootloader is built with size optimization, so I have not made progress in understanding what causes this issue yet.

Regarding reducing the reserved app data to 4 kB, this will not work if the application use FDS. FDS needs at least two pages - 8 kB (1 swap page and 1 data page).