Power consumption increasing when adding mcuboot

[ThibaultM]

Hi,

I'm working on the nrf5340DK and testing power comsumption. I have obtained less than 4uA with the peripheral lbs exemple. To achive this I disabled loging and serial in the application and the network application and enabled PM. I also disabled uart directly in the dk dts file.

My final application will need firmware update so I tryed adding mcuboot to the exemple. I have configured the bootloader through a conf file in the child image directory as follow :

CONFIG_LOG=n
CONFIG_SERIAL=n
CONFIG_MCUBOOT_SERIAL=n

Then I obtain 200uA consumption where I previously have 4uA.

I suppose there is a peripheral that is enabled by the bootloader but I have disabled unused peripherals in dts. I'm not familiar with zephyr os and the multi-image build process, I'm probably missing something.

I obtain the same cunsomption with the smp_srv and power profiling exemple when adding mcuboot.

I'm using NCS 2.2.0

[runsiv]

Hi, 

Can you compare your build/zephyr/zephyr.dts andbuild/mcuboot/zephyr/zephyr.dts to verify if they are the same?

It looks like you could have a similar issue as this ticket  NRF9160 power consumption 1,400uA higher with MCUBOOT enabled 

Regards

Runar

[ThibaultM]

Hi,

Both bootloader and app dts file are exactly the same except for code partition.

I edit directly the nrf5340dk dts file wich is comon for the app and the boot so in my understanding the bootloader shoud not overwrite the app configuration like in the ticket.

But I also tryed with overlay file and got the same result.

Regards

[ThibaultM]

I think I found the issue, It is located in the b0n configuration wich is added with mcuboot. By default the serial is enable in the network bootloader.

Thanks anyway for your help.

Regards

[runsiv]

Glad you found the problem and thanks for sharing the solution

Regards

Runar