nrf52 sdk15.3 pca10040 secure bootloader exemple flash fail

[sarah_sdw]

Hello,

I use the board pca10040 v1.2.4 with the SDK 15.3

I started from the example: dfu \ secure_bootloader on Keil.
I can flash without worry the softdevice and compile the bootloader. but when I want to flash the bootloader I get the error: "Flash download failed -" Cortex-M4 "

I feel that the bootloader wants to write in the region of softdevice but I do not know how to solve the problem.

My Areas for the bootloader are:
IROM1: 0x72000 size 0xC000
IRAM1: 0x200057B8 size 0xA848

I have already looked at this subject without success:
https://devzone.nordicsemi.com/f/nordic-q-a/45910/debugging-serial-uart-bootloader-sdk-15-3

Thanks for your help

[Simon]

It guess your problem is the same as in the thread you are pointing to, the entire page has to be cleared before the bootloader can be flashed. However, the suggested solution will only work if you are debugging it.

Have you tried flashing it manually, using nrfjprog? Try the suggestions in this thread.

Best regards,

Simon

[sarah_sdw]

I change the address of MBR parameter page and I have no problem now.

in nrf_mbr.h:

old:  MBR_PARAM_PAGE_ADDR (0xFFC)

new: MBR_PARAM_PAGE_ADDR (0x10001018)