Application can not start from merge file of [SD + APP + BL + BL Setting]

[ByteSpectrum]

Hi,

I am using

SDK = 17-1-0 and

Chip = nRF52811

SD = "s112_nrf52_7.2.0_softdevice.hex"

BL = "BLE_Secure_Bootloader"

Device can not start in application while I am flashing merge file with SD + APP + BL + BL Setting. 

It will stay in bootloader mode and advertise as "DfuTarg".

I am using below commands to generate merge file:
nrfutil pkg generate --hw-version 52 --sd-req 0x103 --application-version 0 --application app.hex --key-file private.pem app.zip
nrfutil settings generate --family NRF52 --application app.hex --application-version 0 --bootloader-version 0 --bl-settings-version 2 setFn.hex

del "combo.hex"

mergehex --merge bl.hex sd.hex --output bl_sd.hex
mergehex --merge bl_sd.hex setFn.hex --output bl_sd_set.hex
mergehex --merge bl_sd_set.hex app.hex --output combo.hex

Note: I have "nrfutil version 5.2.0"

Can you please help me to fix this issue?

[Einar Thorsrud]

Hi,

This approach looks correct. I wonder which nRF Command Line Tools version you have though? There was an issue some time ago where mergehex has a bug that produced corrupt hex files. So it could be worth updating to the latest version. (with a recent version of mergehex you can also merge all files in one go, as you can have an arbitrary number of input files.

nrfutil 5.2.0 should be OK, but if you still struggle I would update that to the latest as well.

[ByteSpectrum]

Thanks for reply

I have generate merge in single shot.

mergehex --merge bl.hex sd.hex blsetting.hex app.hex --output merge.hex

Also updated nrfutil to "v6.1.7" but still getting same issue and tried in other system which has nrfutil "v6.1.6" but not working.

Can you please try to generate merge file at your end and check it?

Application, Bootloader and softdevice HEX files added in zip.

merge.zip

[Einar Thorsrud]

Hi,

I see the problem now. You are using --family NRF52 when you generate the settings, and this will generate a settings page at the incorrect location. The bootloader settings page is always in the last flash page, and you need to specify a device with the same amount of flash as your device (nRF52811). So you need to use --family NRF52810.

[ByteSpectrum]

Thanks, Now its working.