Matter application on nrf52840 custom board

[PiKa PiKa]

hi 

board : nrf52840 custom board

sdk : nrf connect sdk v2.6.1

example: matter light bulb

problem:

After the code is burned in, the system not working, I have modified and added the following config in the prj.conf file

//added
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n
CONFIG_BOARD_ENABLE_DCDC=n
//modify
CONFIG_DK_LIBRARY=n

What settings do I need to modify to run the matter blub sample on the custom board?

[PiKa PiKa]

Hi 

I also run the build/mcuboot debugger , and found the code stop at 

            if (rc != 0) {
                BOOT_LOG_ERR("Failed to open flash area ID %d (image %d slot %d): %d, "
                             "cannot continue", fa_id, image_index, (int8_t)slot, rc);
                FIH_PANIC;
            }

Do you think this is a problem with the flash configuration?

[AHaug]

Good catch, yes I do believe it is an issue with initialization of the flash configuration or driver. I suspect this happens if you either don't power the external flash if the device is unknown for the bootloader. 

Next steps I would suggest you look into is if you're able to access the external flash from a simpler sample than the Matter Light Bulb. If the issue persists with this, then we need to look into if your external flash device is properly set up in hardware and software

Kind regards,
Andreas

[PiKa PiKa]

Hi
Is external flash necessary to use the matter sample?
if yes ,then I think the problem may be that my custom board does not have external flash.
That is to say, there is no way to use matter-related examples without external flash, right?

[AHaug]

Yes, unfortunately (for the device you're using) it is necessary. In Matter, dual bank DFU is a mandatory feature, and unfortunately both the nRF52840 and nRF5340 has too little flash available to do this without an external flash device.

If you have either a device with enough internal flash you can away with not having an external flash device, but unfortunally all the supported as of now requires an external flash. Here's a link to the memory requirements for some standard Matter applications. Also have a look at the section regarding "External flash": https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/protocols/matter/getting_started/hw_requirements.html 

Kind regards,
Andreas

[PiKa PiKa]

Hi
If the nrf52840 module we choose has built-in large-capacity flash,
Is there any way to use matter application?