FOTA update with external flash

RE: FOTA update with external flash

AHaug — Fri, 16 May 2025 09:14:24 GMT

Happy to help!

Kind regards,
Andreas

RE: FOTA update with external flash

veli-pekka — Fri, 16 May 2025 08:39:19 GMT

Ok, thanks! I was thinking that ID 2 could point to scratch are, which seems not to be defined when

SB_CONFIG_MCUBOOT_MODE_OVERWRITE_ONLY=y

is set.

RE: FOTA update with external flash

AHaug — Fri, 16 May 2025 08:02:11 GMT

Great! Thank you for updating me

[quote user="veli-pekka"]The application updates fine. I'm not sure about the network core, at least it is been uploaded. There is one error in the logs:[/quote]

This specific error for the netcore image is nothing to worry about, as long as the image is uploaded and updated. The reason for this error is specific to the netcore of the nRF5340, since what it's doing here is attempting to read RAM-emulated flash, i.e where the temporary storage for netcore firmware, something which mcumgr can't do.

This is the short explanation, and the longer explanation will require you to spend some time diving into the mcuboot source code specifically for the bootloader used in combination with the nRF5340 in addition to the bootloader documentation https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/bootloaders_dfu/index.html

Let me know if this makes sense!

Kind regards,
Andreas

RE: FOTA update with external flash

veli-pekka — Fri, 16 May 2025 07:14:37 GMT

Thanks, I got the issues sorted out. I now have pretty much this solution:
https://academy.nordicsemi.com/simultaneous-updates-for-both-cores-of-the-nrf5340/

The application updates fine. I'm not sure about the network core, at least it is been uploaded. There is one error in the logs:

00:02:09.561,065] <err> mcumgr_img_grp: Failed to open flash area ID 2: -2

Should I be concerned about it?

RE: FOTA update with external flash

AHaug — Wed, 14 May 2025 12:32:32 GMT

Hello,

There are a couple of items here that could be the root cause, but for a starter I think I might want to recommend you to have a look at https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/ with focus on

There's also the aspect of using TF-M which might change some things w.r.t the samples provided as solutions to the exercises, but for now lets have a look at the external flash configuration as well as the BLE FOTA configuration (if you're doing BLE Fota and not other types of FOTA).

Could you either go through the links provided and see if you spot any differences w.r.t configuration of your external flash DFU solution and/or share your implementation of the external flash FOTA (configs, board files, initialization of the qspi/spi driver etc)?

Kind regards,
Andreas

RE: FOTA update with external flash

veli-pekka — Wed, 14 May 2025 10:10:08 GMT

there is in build/mcuboot/zephyr/.config and .config.sysbuild

CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=y

Which makes that warning look quite strange.