bootloader gone after DFU(nRF52832/sd132_v2.0.0)

[Bill Gou]

Hi,

I encountered an issue when trying to integrate DFU to my application. Every time I upload my application through DFU, the bootloader gets overwritten, i.e. only softdevice and application are left in the flash. However if I upload the example dfu_test_app image from the sdk, the bootloader is retained.

Here are my h/w and s/w environment:

board: PCA10036

sdk: nRF5_SDK_11.0.0_8908197

softdevice: s132_nrf52_2.0.0_softdevice.hex

bootloader: compiled from nRF5_SDK_11.0.0_89a8197\examples\dfu\bootloader\pca10036\dual_bank_ble_s132\arm5_no_packs

Any suggestions are appreciated.

Thanks, Bill

[Bill Gou]

Could anyone shed a light on this please?

[Bill Gou]

It turned out to be a bug in my own app: the UICR is cleared every time the app starts, so the bootloader address is lost.

[Hung Bui]

Hi Bill, Glad that you found the issue. It also always good to test by reading the flash out. You can use nrfjprog --readcode for that reason. Then you can check if the bootloader is overwritten or not.