Customizing a bootloader

[p143]

If all you need is changing  PHY, Tx power and Device Name in a standard nRF52840, do you need building a new bootloader from the scratch or the is a way to edit the standard firmware,  build a new edited file and finally re-program this file in a standard nRF52840? Thanks

[p143]

Hi Vidar.

Following your advice, the problem has been solved. Thanks.

And by the way. Let me take this opportunity to ask you a terminology question. When  Nordic guides refer to "the bootloader", is the term completely equivalent to "the firmware"? And also. What the bootloader contains?: booting code+one application+one softdevice+MBF+something else maybe? Is this Softdevice the S140 SDS or there are different types of Softdevices? Thanks for the clarification.

[Vidar Berg]

Hi,

The bootloader is a separately linked "application" with is own vector table, same applies to MBR, Softdevice and the main Application (note: the softdevice binary is merged with MBR image). Maybe it gets more clear if you have look at  the bootloader memory layout here: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_bootloader.html?cp=4_0_0_3_5_0_7#lib_bootloader_memory  All of the DFU functionality is implemented in the bootloader code and bootloader is also in charge of validating and booting the main app. 

There are different softdevice variants, but only s140 is compatible with the nRF52840 (combability matrix).