Hi, We are currently evaluating nRF52810. I have a couple of queries on DFU: 1. Provided having an application, soft-device, and bootloader in memory, we have to update only bootloader using DFU. With all the three components, the memory is almost f

[Bijosh]

Hi,

We are currently evaluating nRF52810. I have a couple of queries on DFU:

1. Provided having an application, soft-device, and bootloader in memory, we have to update only bootloader using DFU. With all the three components, the memory is almost full. How to achieve bootloader only DFU in this case?

2. How to erase application from the memory using DFU

3. After DFU, observed that the MBR parameter section on the memory is almost doubled. Is this expected? If yes, why is that happening?

Regards,

-Bijosh

[Vidar Berg]

Hi,

1. If the bootloader can't fit in bank 1 the bootloader will have to place the image in bank 0 where the existing application is located. In that case, the bootloader updated will have to be performed in 2 rounds, first one to update the bootloader which deletes the existing app, then update the app again.

2. The bootloader handles this as long as the bootloader is configured to allow single banked/ in-place updates

3. Sorry, I'm not sure I understand this question. The bootloader shall reserve one 4K flash page to the MBR parameter when DFU of bootloader is supported.

Regards,

Vidar

*Edit*: adding some relevant documentation links for reference:

- Memory layout

- Dual-bank and single-bank updates

- Master boot record and bootloader