swap size in bluetooth dfu

[viswa]

Hi Everyone,

Hope you all are doing well.

I'm using nrfConnect sdk v1.7.0 and vscode for development.

controller : nrf52833

Here I tried to build image with bluetooth dfu support for nrf52833 chipset. these are my code size details.

Memory region

            Used Size  Region Size  %age Used
FLASH : 230536 B 237056 B  97.25%
SRAM  : 36908 B   128 KB      28.16%
IDT_LIST: 0 GB      2 KB           0.00%

I was able upload new image in nrfconnect manager application.

But,

while booting I got following response.

*** Booting Zephyr OS build v2.6.99-ncs1  ***

I: Starting bootloader

I: Primary image: magic=good, swap_type=0x2, copy_done=0x1, image_ok=0x1

I: Secondary image: magic=good, swap_type=0x2, copy_done=0x3, image_ok=0x3

I: Boot source: none

I: Swap type: test

W: Not enough free space to run swap upgrade

I: Bootloader chainload address offset: 0xc000

I: Jumping to the first image slot

Now, my image exactly fits into the flash size available with dfu support, how much memory is required to run swap upgrade?

And again why it consumes too much flash for bluetooth dfu support, is there any minimal version available?

[Øivind]

Hi,

Is this on the nrf52833dk, with 512kB of flash, or a custom board with less flash? How large was the project before you added dfu support?

[viswa]

currently i'm testing in nrf52840dk. but build is for nrf52833 chipset.

Before adding bluetooth dfu, my app size is around 210KB. so there's around 20kb extra flash used by bluetooth dfu. same goes with serial_dfu.

[Øivind]

So you are getting "Not enough space" on the nrf52840dk? That would be strange, that board should have more than enough space.

[viswa]

let me be clear, I'm building for nrf52833 and chose nrf52833dk as board while building the application and testing application in nrf52840 dk. It's more than enough for 840 but we are building project on 833 chip.