Sample smp_svr on NRF52840 dongle: .text does not fit in FLASH

[elias123]

Hi,

I am trying to evaluate the provided smp_svr sample with the BLE DFU on the NRF52840 dongle after I have already tested it on the DK.

I get the following error message during the build: zephyr/zephyr_pre0.elf section `text' will not fit in region `FLASH'. Region `FLASH' overflowed by 10876 bytes. I assume the reason for it is the bootloader that is required for flashing the dongle. What do I have to do to get it work on the dongle?

Thank you!

Elias

[Edvin]

Hello Elias,

Since the dongle has a bootloader and MBR from the nRF5 SDK, it means that the flash addresses from 0x00000000 -> 0x00001000, and a chunk at the end (don't remember the address by heart, but this is the old bootloader, and it is located at the "top" of the flash) is already occupied, and you can't remove them.

Since the mcuboot bootloader from NCS is usually placed on 0x00000000, this will collide with the nRF5 MBR. Therefore, the board files say that you need to stay away from 0x00000000 -> 0x10000000, and it will. The problem however, is that it then tries to fit the bootloader into 0x00001000 -> 0x0000c000, which is a bit too small. Add this to your smp_svr\child_image\mcuboot.conf:

CONFIG_PM_PARTITION_SIZE_MCUBOOT=0x10000

This will increase the size of the MCUBOOT parition, so that it can still fit the bootloader even though it doesn't touch the MBR from the nRF5 SDK.

Best regards,

Edvin

[Spector]

I too have the problem with >west build -b nrf52840dongle_nrf52840 -d build/smp_svr zephyr/samples/subsys/mgmt/mcumgr/smp_svr

What i don't understand is that this https://docs.nordicsemi.com/bundle/ncs-2.6.1/page/zephyr/boards/arm/nrf52840dongle_nrf52840/doc/index.html

Is on the website as an example. It relys on files stored in the ncs2.6.1 git repo.

Yet the command fails. Why aren't the .conf files up to date? Am i suppose to manually go in and change the board config files?

[Edvin]

Hello,

Unfortunately, not all samples work with all boards. Perhaps you can share your build log, and we can look into it. 

It is not recommended to change the board files directly. You can use a an overlay file, called nrf52840dongle_nrf52840.overlay, and place it in a folder called boards in your application's root folder (look at how it is done in most of the samples in NCS). There you can add things that change the default board files.

Best regards,

Edvin

[Spector]

Whats the best way for submitting output logs? Or even the entire build directory for build/mcuboot and build/smp_svr.

[Edvin]

save the build log to a txt file, and put everything in a .zip folder, and upload it here (drag and drop).