NRF52832 Serial Bootloader(without SD) fails to boot app

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

navan93 — Mon, 24 Feb 2020 18:13:58 GMT

Hi,

Thank you for the solution, actually I just read about this in one of the posts relating to MBR and tried and it worked.

Is this documented anywhere? I feel it would be good to add this part in the uart dfu page.

I am now able to perform DFU over uart without softdevice.

Thanks

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

bjorn-spockeli — Thu, 20 Feb 2020 19:58:46 GMT

Ok, what is the Section Placement macro in the CLI project? Are these left to the default values, i.e.

FLASH_PH_START=0x0

FLASH_PH_SIZE=0x80000

RAM_PH_START=0x20000000

RAM_PH_SIZE=0x10000

FLASH_START=0x0

FLASH_SIZE=0x80000

RAM_START=0x20000000

RAM_SIZE=0x10000

or have you modified them? If not then you need to set the FLASH_START to 0x1000 and the 0x7F000 and set RAM_START to 0x20000008 and RAM_SIZE to 0xFFF8

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

navan93 — Thu, 20 Feb 2020 15:43:22 GMT

When i tested i did not use MBR.

\examples\peripheral\cli\pca10040 - this is the example i used as a starting point , just edited in SES and ran from there.

I have used --sd-req in the nrfutil for generating DFU image.

This is the command used to generate package.

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

bjorn-spockeli — Thu, 20 Feb 2020 15:33:59 GMT

Hmm, seems that you are correct. How did you generate the DFU image? Previously one was forced to specify the --sd-req in nrfutil, which would result in the image being rejected as there were no SD present.

When you tested the application without the bootloader, did you flash the MBR and shift the application to 0x1000?

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

navan93 — Thu, 20 Feb 2020 04:04:27 GMT

devzone.nordicsemi.com/.../rt.log

PFA the bootloader log. From that I can see that it is placing the image to address 0x1000 which is end of MBR , since there is no SoftDevice present. Isn't this contrary to what you said? So in this case this should actually be starting my app but somehow it does not.

Please help in debugging this.

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

navan93 — Wed, 19 Feb 2020 14:32:36 GMT

FYI I am not using any softdevice as I am not using any BLE features right now. Hence my requirement is to use NRF52832 in a non BLE application with the bootloader for serial DFU.

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

navan93 — Wed, 19 Feb 2020 14:15:33 GMT

Hi,

So how can i get the application to work in this case ?

RE: NRF52832 Serial Bootloader(without SD) fails to boot app

bjorn-spockeli — Wed, 19 Feb 2020 12:47:09 GMT

Hi Navaneeth,

the Secure Serial bootloader is not dependent on the SoftDevice, i.e. it uses the NVMC directly to perform the flash operations instead of enabling the SoftDevice and using the SoftDevice Flash API. However, it(the bootloader) assumes that the application will be placed directly after the SoftDevice in flash, i.e. it assumes that there will be a SoftDevice present when starting the application.

Best regards

Bjørn