DFU BLE FOTA not working on nRF5340 Audio DK board

Question

Hi there: I want to do BLE FOTA on nRF5340 Audio DK board. I have sdk v2.6.2. I'm trying to make the existing audio application work by taking the source code as it is from "~/ncs/v2.6.2/nrf/applications/nrf5340_audio". I added only one line in prj.conf, which is CONFIG_AUDIO_DFU=2 The build command is as follows. west build --build-dir ~/ncs/v2.6.2/nrf/applications/nrf5340_audio/build ~/ncs/v2.6.2/nrf/applications/nrf5340_audio --pristine --board nrf5340_audio_dk_nrf5340_cpuapp -- -DNCS_TOOLCHAIN_VERSION=NONE -DCONFIG_SIZE_OPTIMIZATIONS=y I get errors like below. In file included from /home/someusr/ncs/v2.6.2/bootloader/mcuboot/boot/zephyr/include/sysflash/sysflash.h:10, from /home/someusr/ncs/v2.6.2/bootloader/mcuboot/boot/bootutil/src/bootutil_misc.c:32: /home/someusr/ncs/v2.6.2/bootloader/mcuboot/boot/zephyr/include/sysflash/pm_sysflash.h: In function '__flash_area_ids_for_slot': /home/someusr/ncs/v2.6.2/bootloader/mcuboot/boot/zephyr/include/sysflash/pm_sysflash.h:47:60: error: 'PM_MCUBOOT_SECONDARY_ID' undeclared (first use in this function); did you mean 'PM_MCUBOOT_PRIMARY_ID'? 47 | #define FLASH_AREA_IMAGE_0_SLOTS PM_MCUBOOT_PRIMARY_ID, PM_MCUBOOT_SECONDARY_ID | ^~~~~~~~~~~~~~~~~~~~~~~ /home/someusr/ncs/v2.6.2/bootloader/mcuboot/boot/zephyr/include/sysflash/pm_sysflash.h:52:29: note: in expansion of macro 'FLASH_AREA_IMAGE_0_SLOTS' 52 | #define ALL_AVAILABLE_SLOTS FLASH_AREA_IMAGE_0_SLOTS | ^~~~~~~~~~~~~~~~~~~~~~~~ /home/someusr/ncs/v2.6.2/bootloader/mcuboot/boot/zephyr/include/sysflash/pm_sysflash.h:67:9: note: in expansion of macro 'ALL_AVAILABLE_SLOTS' 67 | ALL_AVAILABLE_SLOTS I tried with different CONFIG_AUDIO_DFU=1, that gives flash size error. I have below questions: 1. How to make this application work for BLE FOTA DFU? 2. I have my own application that can run BLE FOTA DFU successfully on nrf5340dk board. I used the following in mcuboot.overlay file and in prj.conf of the app and mcuboot.conf. If I need to make this app run on nrf5340 audio board with BLE FOTA DFU, what do I need to modify in the following? mcuboot.overlay / { chosen { nordic,pm-ext-flash = &mx25r64; }; }; app prj.conf CONFIG_BOOTLOADER_MCUBOOT=y CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y CONFIG_NRF53_UPGRADE_NETWORK_CORE=y CONFIG_UPDATEABLE_IMAGE_NUMBER=2 mcuboot.conf CONFIG_NORDIC_QSPI_NOR=y CONFIG_BOOT_MAX_IMG_SECTORS=256 CONFIG_LOG=y CONFIG_MCUBOOT_LOG_LEVEL_WRN=y CONFIG_NRF53_MULTI_IMAGE_UPDATE=y CONFIG_UPDATEABLE_IMAGE_NUMBER=2 CONFIG_BOOT_UPGRADE_ONLY=y CONFIG_PCD_APP=y CONFIG_FLASH=y CONFIG_FLASH_SIMULATOR=y CONFIG_FLASH_SIMULATOR_DOUBLE_WRITES=y CONFIG_FLASH_SIMULATOR_STATS=n CONFIG_BOOT_SIGNATURE_KEY_FILE="/path/somekey.pem" 3. The nRF5340 Audio DK product brief says "The nRF5340 Audio DK application uses the MX25R6435F as the SPI NOR Flash." And, I see the following in ~/ ncs/v2.6.2/nrf/applications/nrf5340_audio/dfu/conf/overlay-dfu_external_flash.overlay. I think the solution for my requirement (BLE FOTA DFU on nRF5340 Audio board for my app) is to understand this better. Please throw some light on this. Refer me to a place where I can go through resources around this to understand this better. mx25r64: mx25r6435f@2 { compatible = "jedec,spi-nor"; reg = <2>; spi-max-frequency = <8000000>; jedec-id = [c2 28 17]; sfdp-bfp = [ e5 20 f1 ff ff ff ff 03 44 eb 08 6b 08 3b 04 bb ee ff ff ff ff ff 00 ff ff ff 00 ff 0c 20 0f 52 10 d8 00 ff 23 72 f5 00 82 ed 04 cc 44 83 68 44 30 b0 30 b0 f7 c4 d5 5c 00 be 29 ff f0 d0 ff ff ]; size = <67108864>; has-dpd; t-enter-dpd = <10000>; t-exit-dpd = <5000>; dpd-wakeup-sequence = <30000 20 45000>; };