Help with BLE DFU FOTA on External Flash (nRF52840, NCS 2.5.2)

RE: Help with BLE DFU FOTA on External Flash (nRF52840, NCS 2.5.2)

Menon — Tue, 04 Feb 2025 12:11:53 GMT

Hello,

Good to hear that you made some progress.

Kind Regards,

Abhijith

RE: Help with BLE DFU FOTA on External Flash (nRF52840, NCS 2.5.2)

jtf — Tue, 04 Feb 2025 10:02:21 GMT

I’ve made some progress but ran into a new issue. I’ll investigate further before asking questions. If needed, I can post it on GitHub.

RE: Help with BLE DFU FOTA on External Flash (nRF52840, NCS 2.5.2)

Menon — Tue, 04 Feb 2025 08:51:27 GMT

Hello,

I don't think CONFIG_DISK_DRIVERS can be set directly. See the Kconfig reference, it gets enabled by DISK_ACCESS. Can you share the whole build log here so that I can take a closer look at the issue?

Kind regards,
Abhijith

RE: Help with BLE DFU FOTA on External Flash (nRF52840, NCS 2.5.2)

jtf — Mon, 03 Feb 2025 13:03:51 GMT

Thanks for the thread. The hello_world example compiles, but adding these definitions brings back the same compiler error.

CONFIG_NORDIC_QSPI_NOR=y
# The mx25 erase page size
CONFIG_NORDIC_QSPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096
CONFIG_DISK_DRIVERS=y
CONFIG_DISK_DRIVER_FLASH=y

RE: Help with BLE DFU FOTA on External Flash (nRF52840, NCS 2.5.2)

Menon — Mon, 03 Feb 2025 12:37:35 GMT

Hello,

While checking the shared pm_static file and the overlay, there are some mismatches in the definition, which could be the cause of the issue you are seeing.

In the pm_static.yml file, you defined mcuboot_secondary as 0x00000–0xf4000, which overlaps with the external flash region defined as 0xf4000–0x800000. This will cause MCUboot to fail. Additionally, in the pm_static file, external_flash starts after mcuboot_secondary, at 0xf4000, and extends to 0x800000, but external_partition starts at 0x00000000 inside the overlay file.

I recommend that you take a look at this old DevZone case, which discusses a similar issue and contains some useful reference links.

You can use both pm_static.yml and .overlay files, but they must not conflict. I recommend using the pm_static.yml alone first, if you only need to define a simple set of partitions like MCUBoot, application and storage.

Kind Regards,

Abhijith