Move bootloader during application

[VanNuru]

I would like to update my current bootloader with one, that is bigger than the predefined space of the current bootloader. For that, I want to flash an application via DFU that moves the bootloader to a lower address, so that the new bootloader can fit into the bigger space. Than I simply make a DFU with the new bootloader.

The problem is currently the moving part where my application does the following:

1. Adjust the bootloader address to the new address by changing the UICR (NRF_UICR_BASE + 0x14) --> this works without a problem
2. Copy the current bootloader to free space in flash (bank 1)
3. Erase the space for the new bootloader
4. Copy the current bootloader from bank 1 to the new address (see 1.)

All this is done successfully, but when I do a soft reset to start the moved bootloader, nothing happens anymore.

What am I missing here? Thanks.

I'm working with an Eclipse makefile Project with Cross ARM GCC on a nRF52832 with s132_nrf52_2.0.0_softdevice.hex and the nRF5_SDK_11.0.0_89a8197.

[bjorn-spockeli]

Hi Vanuru,

I've made an example that alters the bootloader start address in order to update from the Legacy Bootloader(SDK v11.0.0 and older) to the Secure Bootloader (SDK v12.x.0). You can also use this example to increase the size of Legacy bootloader.

The details and the necessary code changes are described in this post.

Best regards

Bjørn

[VanNuru]

I didn't know that the bootloader update would work, if I changed the bootloader start address directly before using the MBR. Somehow your code to change it crashed my update, so I used my own and now I can change the start address dynamically. Thank you!