Adafruit bootloader + nRF Connect Zephyr Application

RE: Adafruit bootloader + nRF Connect Zephyr Application

rgrr2 — Tue, 07 May 2024 16:30:51 GMT

I guess not required. Searched a little bit more than before with Google and perhaps used the correct keywords and found it... tada... here: devzone.nordicsemi.com/.../uf2-image-and-bootloader

So the solution is to use this in a .conf file:

CONFIG_BUILD_OUTPUT_UF2=y
CONFIG_ROM_START_OFFSET=0x1000

RE: Adafruit bootloader + nRF Connect Zephyr Application

JONATHAN LL — Tue, 07 May 2024 09:14:31 GMT

Hi rgrr2
Can you create a new ticket and link to this one in the new ticket?

RE: Adafruit bootloader + nRF Connect Zephyr Application

rgrr2 — Tue, 07 May 2024 07:56:37 GMT

is there any progress on this. Asking because I'm currently fighting with the same problem.

RE: Adafruit bootloader + nRF Connect Zephyr Application

JONATHAN LL — Fri, 24 Jun 2022 08:57:50 GMT

[quote user="douglas.malnati"] MBR (master boot record) [/quote]

MBR is something that is used in the "old" SDK, so not Zephyr but our nRF5SDK, so it is not relevant for Zephyr.

MCUboot is typically at the sart of the flash, then the application slots are after. MCUboot is the first thing that starts when the chip start(as long as MCUboot is used) and it is what "starts" the application.

There is info here: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/mcuboot/design.html

And this blog is usefull: https://jimmywongiot.com/2021/05/26/overview-on-mcuboot-zephyr-rtos/

And at last there are som videos from David Brown on the MCUboot topic: MCUboot: Multi-Image Support - David Brown, Linaro, Ltd - YouTube

Regards,
Jonathan

RE: Adafruit bootloader + nRF Connect Zephyr Application

douglas.malnati — Wed, 22 Jun 2022 15:53:33 GMT

Thank you, I appreciate the reply.

Can you tell me, or point me to information, about the specifics of how the MCUBoot bootloader loads and invokes new application code?

I am becoming more familiar with the layout of flash. I assume MCUBoot lives at a given address (where?) and expects my application code to live at a given address (where?). And invokes it how?

And what runs MCUBoot? I've seen some documentation talking about an MBR (master boot record) but I'm not very unclear on what it specifically is, and how it fits into the above picture (if it does at all).

Thank you for the help.

Doug

RE: Adafruit bootloader + nRF Connect Zephyr Application

JONATHAN LL — Wed, 22 Jun 2022 14:57:40 GMT

We are not the makers of the Adafruit bootloader, so you would have to contact Adafruit for that info.

A option you can use is to use the MCUBoot bootloader but it does not support uf2. So the drag and drop feature the Adafruit bootloader has is not something we have. My guess it that the zephyr compiled hex file you have that converts to a uf2 file does not match the memory criteria the Adafruit bootloader is expecting, so it fails understand the application.

Regards,
Jonathan