Bootloader start

RE: Bootloader start

Albin — Wed, 12 May 2021 07:53:38 GMT

That was indeed the issue i got the starting address of the application wrong i belive this is why the bootloader was considering it as invalid

Thank you for your help !

RE: Bootloader start

Albin — Wed, 12 May 2021 07:06:08 GMT

Hello,

i'm on SDK 17 i've changed the version to 2 but i'm still stuck in DFU mode. I have a question on the settings file :

i have a softdevice of 149876 Kb while the setting says 0

and my app is 23784 whule the setting says 17536

maybe there is a problem here ? do those values have to match ?

RE: Bootloader start

Einar Thorsrud — Tue, 11 May 2021 18:10:35 GMT

Hi,

Most of this looks correct, but the settings version should be 2 if you are using a recent SDK version.

RE: Bootloader start

Albin — Tue, 11 May 2021 13:30:38 GMT

Hello i've tried to create the settings file like this :

then i've merged it with the .hex of the bootloader

then i used nrf connect programmer to flash eveything :

but the application is still stuck in the dfu mode.

Have i done something wrong ?

RE: Bootloader start

Einar Thorsrud — Tue, 11 May 2021 12:01:17 GMT

Hi,

You need to generate and program the bootloader settings page as well. This is used by the bootloader to know if a valid application is present, and the hash of the application so that it can be validated by the bootloader. If this is not present or invalid, the bootloader will enter DFU mode in order to make recovery possible. See Generating and displaying bootloader settings.