Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

Paskin — Fri, 19 Jan 2024 17:42:13 GMT

Sorry - I cannot.
The config is CONFIG_BOARD_ENABLE_DCDC=n
For me - it worked only if added to board's defconfig (not Kconfig).

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

Kazi Afroza Sultana — Fri, 19 Jan 2024 16:47:33 GMT

hello,

Could you please share your project file what I asked before?

''I managed to solve it by setting CONFIG_DC_DC (not sure for exact spelling) to "n"''. '' CONFIG_DC_DC'' It does not look like a valid config.

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

sean — Wed, 10 Jan 2024 09:46:41 GMT

It's possible for you to say this, thank you

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

Paskin — Wed, 10 Jan 2024 09:44:52 GMT

To get an answer from Nordic you may need to open a separate ticket.

In my understanding - it is related to power supply configuration for an MCU core. If it is set to be feed from internal DCDC and the latter doesn't get an external power - MCU is off. And RTT overrides the settings for the time of a connection

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

Paskin — Wed, 10 Jan 2024 09:44:49 GMT

To get an answer from Nordic you may need to open a separate ticket.

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

sean — Wed, 10 Jan 2024 09:26:11 GMT

This operation is possible, but I would like to inquire nordic what may be cause this happen

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

Paskin — Wed, 10 Jan 2024 06:45:21 GMT

I managed to solve it by setting CONFIG_DC_DC (not sure for exact spelling) to "n". But to be taken into an account, it has to be done in the board definition, not the application config.

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

sean — Wed, 10 Jan 2024 02:09:20 GMT

Hi，

I have encountered the same problem and need the RTT connection ，code to run 。Disconnect RTT, code stops running，may be what's the problem?

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

Paskin — Wed, 06 Dec 2023 12:47:42 GMT

Thanks, it indeed was a reason.

If the board requires DCDC to be disabled - it has to be disabled in a board, not the project configuration.

RE: Another issue with nRF52840 and MCUBoot - not starting without RTT and stopping when it is disconnected

Kazi Afroza Sultana — Thu, 30 Nov 2023 16:12:59 GMT

Helo,

Some project configurations can be overwritten by child images. That's why, enabling mcuboot may be the cause of not running the program on board.

Can you post your prj.conf for your project + configurations for your custom boards?

Thanks.

Kazi