How properly calculate the space needed for .mbr_params_page?

[ivnn]

Hi, after adding some functional to bootloader an error occurred: section .tdata overlaps absolute placed section .mbr_params_page
how to calculate the size need for mbr_params_page

Options Common

Memory segments:
FLASH RX 0x0 0x80000;
RAM RWX 0x20000000 0x20000;
mbr_params_page RX 0x0007E000 0x1000;
bootloader_settings_page RX 0x0007F000 0x1000;
uicr_bootloader_start_address RX 0x10001014 0x4;
uicr_mbr_params_page RX 0x10001018 0x4

Section placement macros:
FLASH_PH_START=0x0
FLASH_PH_SIZE=0x80000
RAM_PH_START=0x20000000
RAM_PH_SIZE=0x20000
FLASH_START=0x78000
FLASH_SIZE=0x6000
RAM_START=0x2000260c
RAM_SIZE=0x1d9f4

infocenter.nordicsemi.com/index.jsp

[Amanda Hsieh]

Hi, 

Seems the bootloader is overlapped with MBR parameter storage, so try to lower the flash start address of the bootloader to give enough space to the bootloader without overlapping with MBR parameter storage. 

Regards,
Amanda

[ivnn]

Hi,
yes, I see it builds ok with 

FLASH_START=0x77000
FLASH_SIZE=0x6000

am I right the bootloader fw size should be 24kB to be able to update also the bootloader itself with the dfu zip (app+bl+sd) 

[Amanda Hsieh]

Hi, 

When the flash address starts at 0x78000, there are 24kB til 0x0007 E000 for the bootloader. (because MBR parameter storage starts from 0x0007 E000.) If the bootloader requires more than 24KB, you can try to move the flash start address down to get more space and avoid overlapping with  MBR parameter storage. 

-Amanda