Booloader remap

RE: Booloader remap

cedric — Fri, 22 May 2020 21:03:02 GMT

The problem stands in nrf_dfu_types.h, because I've made a project copied from secure bootloader. In the Keil project settings, nrf52832_AA was still defined so that bootlodaer settings address was not set correctly.

Othewise, I had to reduce the project size in flash, by setting off the log module, which was not important because debug is made whithout bootloader.

In short, when you want to have a bootloader from AA to AB type you have to :

Bootloader

- set ROM start to 0x00036000

- set ROM size to 0x8000

- use the RAM not used by softdevice

- set booloader settings address to 0x0003F000UL

App

- set ROM start to softdevice end (see this post )

- set RAM accordingly

- be sure that app ROM size doesn't exceed the space between softdevice and bootloader

RE: Booloader remap

Vidar Berg — Wed, 20 May 2020 12:55:57 GMT

The memory layout looks ok. Have you tried to see if you can debug the application or bootloader after completing the DFU? Maybe it is going in a reset/boot loop? Or is the device going back to DFU mode?

RE: Booloader remap

cedric — Wed, 20 May 2020 12:18:59 GMT

Hi, that's what I was thinking : I don't use FDS so it's not the problem. Could it be a problem in restart settings? How can I check that mdr parameter storage and bootloader settings are good?

RE: Booloader remap

Vidar Berg — Wed, 20 May 2020 12:12:12 GMT

That explains why you had to set NRF_DFU_APP_DATA_AREA_SIZE to zero. But app data is usually not included in the DFU image. Does it have to be included in this case? Also, are you using FDS? As I mentioned, it will fail to initialize if the allocated flash pages become corrupted during DFU.

RE: Booloader remap

cedric — Wed, 20 May 2020 11:55:59 GMT

Hi, the size is 0x10000

RE: Booloader remap

Vidar Berg — Wed, 20 May 2020 11:48:22 GMT

Hi,

[quote user=""]Iv'e set NRF_DFU_APP_DATA_AREA_SIZE to 0 and the bootloader transfert process is going on, but the application never starts. The application has been validated on an AB and the whole process has been tested on a AA[/quote]

It sounds like the new application may be too large to fit in the area between Softdevice end and application data start (see Memory layout). FDS will fail to initialize if the flash pages get overwritten during the DFU process which is a possibility when NRF_DFU_APP_DATA_AREA_SIZE == 0.

What is the size of application binary file you do DFU with?