MCUboot won't boot into serial recovery mode by using retained memory

RE: MCUboot won't boot into serial recovery mode by using retained memory

DB_ECD — Thu, 18 Jul 2024 06:31:02 GMT

[quote userid="106736" url="~/f/nordic-q-a/113138/mcuboot-won-t-boot-into-serial-recovery-mode-by-using-retained-memory/494391"]MCUboot also needs DTS overlays.[/quote]

Ohh, I didn't know that!

I added the same overlay that I posted originally (where the retention is enabled) and added this to child_image/mcuboot/mcuboot.overlay

But then I could not add it in the mcuboot build configuration as an overlay file, this produces a build error. Instead, I had to include it to the project configuration by using the extra Cmake argument -Dmcuboot_DTC_OVERLAY_FILE="child_image/mcuboot/mcuboot.overlay"

With this, resetting into the bootloader works as expected.

Thank you very much for your help!

As a last general question: is there a way to know when to add what configuration, overlay etc. to the project or to the child image(s)? For me, this is always a (rather frustrating) trial and error procedure.

RE: MCUboot won't boot into serial recovery mode by using retained memory

Sigurd Hellesvik — Wed, 17 Jul 2024 13:25:02 GMT

I probably should have said before, but did you choose MCUboot before using the GUI?

[quote user="DB_ECD"]In my DeviceTree I have the retention system enabled. The application seems to find that. But MCUboot does not..[/quote]

MCUboot also needs DTS overlays.

See for example here:

https://github.com/hellesvik-nordic/samples_for_nrf_connect_sdk/blob/main/bootloader_samples/smp/mcuboot_smp_uart_feat_external_flash/child_image/mcuboot.overlay

RE: MCUboot won't boot into serial recovery mode by using retained memory

DB_ECD — Wed, 17 Jul 2024 12:54:31 GMT

Okay, I did not see that you could check the info for mcuboot directly by choosing it under the build folder in the VS Code extension. I just did that and the KConfig GUI shows the configuration parameters as enabled, which are produced as a warning in the compilation later on.

For example:

The error during compiling says:

warning: BOOT_SERIAL_BOOT_MODE (defined at
C:/ncs/v2.6.1/bootloader/mcuboot/boot/zephyr\Kconfig.serial_recovery:166) was assigned the value 'y'
but got the value 'n'. Check these unsatisfied dependencies: RETENTION_BOOT_MODE (=n). See
http://docs.zephyrproject.org/latest/kconfig.html#CONFIG_BOOT_SERIAL_BOOT_MODE and/or look up
BOOT_SERIAL_BOOT_MODE in the menuconfig/guiconfig interface. The Application Development Primer,
Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual might be
helpful too.

But the BOOT_SERIAL_BOOT_MODE as well as the RETENTION_BOOT_MODE are both set if i look into the Kconfig GUI:

RE: MCUboot won't boot into serial recovery mode by using retained memory

DB_ECD — Wed, 17 Jul 2024 12:43:31 GMT

I can only find the parameters that I set in the applications prj.conf file, where everything seems to be ok. How would I check the data for the mcuboot? Sorry if these are basic questions, but I'm kind of lost here..?

To add a question here:

in the warning output of the compile, I can see that

"Check these unsatisfied dependencies: DT_HAS_ZEPHYR_RETENTION_ENABLED (=n)"

In my DeviceTree I have the retention system enabled. The application seems to find that. But MCUboot does not..

RE: MCUboot won't boot into serial recovery mode by using retained memory

Sigurd Hellesvik — Wed, 17 Jul 2024 12:15:06 GMT

Yes, from here:
https://docs.nordicsemi.com/bundle/nrf-connect-vscode/page/reference/ui_kconfig.html

RE: MCUboot won't boot into serial recovery mode by using retained memory

DB_ECD — Wed, 17 Jul 2024 11:58:12 GMT

Hi Sigurd,

can you elaborate on that?

Somehow I can't get menuconfig started in the VS Code Extension. There is some kind of python error which i have to look into.

Can I use the GUI Config as well? What should I look for here?

RE: MCUboot won't boot into serial recovery mode by using retained memory

Sigurd Hellesvik — Wed, 17 Jul 2024 11:23:21 GMT

Hi,

[quote user=""]Now I found out, that while compiling, I get warnings in the MCUboot portion of the compile:[/quote]

For these Kconfig override warnings, can you use menuconfig to check which dependency is not set? For each option.

Regards,
Sigurd Hellesvik