RE: DFU bootloader -- region FLASH overflowed

Einar Thorsrud — Thu, 06 Jun 2019 12:33:30 GMT

Hi,

You need to move the start address of the bootloader down so that you can accommodate the increased size. Since you use GCC you do this by adjusting the ORIGIN and LENGTH in the following line in the linker script (typically <SDK>\examples\dfu\secure_bootloader\pca10040_ble\armgcc\secure_bootloader_gcc_nrf52.ld):

examples\dfu\secure_bootloader\pca10040_ble\armgcc\secure_bootloader_gcc_nrf52.ld

You should have the memory layout in mind when you do this. Essentially the bootloader is close to the end of the flash, but you must reserve two pages after that (MBR params and bootloader settings). You also need to erase the SoftDevice before you program the bootloader again, as the bootloader .hex will contain the new bootloader start address that will be programmed at the end of the MBR page.