How to merge serial and BLE DFU for SDK17

[Riaan]

Hi,

I need to support both BLE update and serial update with sdk 17.

Going through some past post, the idea is clear.

1) Start with DFU_BLE example project.

2) Add the nrf_dfu_serial and nrf_dfu_serial_uart files to project.

3) Diff config with the DFU_UART project to add in the serial config

4) compile, and add the files that are now missing (also available in the DFU_UART project)

This all goes well, but I get the following error:

ld: error: section.tdata overlaps absolute placed section .mbr_params_page

I enabled link time optimization to make my files smaller. I also removed al logging, and removed anything that does not seem needed. But still no luck

Is there away around this?

[Riaan]

I changed the Flash_START from 0x78000 to 0x77000 and the FLASH_SIZE from 0x6000 to 0x7000.

If I run the code form SES it works. I can start the update process from both serial and ble.

Is it that easy?

I know I got to make the main app's Flash size smaller by 0x1000. But will all the other apps be ok with this new location?

Is there something else I got to change, or is this not even the right method?

[Hung Bui]

Hi Riaan,

I think you have the right fix. The reason you had the issue before was that there wasn't enough space for tdata inside application space and it overlapping with the mbr_params_page which define inside flash_placement.xml.

You can have a look at this memory layout to know what the app size should be: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.0/lib_bootloader.html?cp=7_1_3_5_0_7#lib_bootloader_memory

Note that when you do dual bank update you need to have free space to receive new image. Otherwise the DFU will be performed in single bank update option.