Regarding flash overflow when dfu is enabled

[Rakshita]

I am working on a module MS12SF1(nrf7002+nrf5340). I am using wifi,ble,sdcard,uart and https functionalities in my code. Currently my flash usage is 72.44%. I also want to use dfu through ble. If I enable the configurations of dfu, the flash overflows by 270940 bytes.

I don't know what else I should optimise to solve this.

I am using nrf sdk v2.6.1

This is my prj.conf file

# Wi-Fi
CONFIG_WIFI=y
CONFIG_WIFI_NRF700X=y
CONFIG_WPA_SUPP=y

# Wi-Fi credentials
CONFIG_WIFI_CREDENTIALS=y
CONFIG_WIFI_CREDENTIALS_STATIC=y
CONFIG_WIFI_CREDENTIALS_STATIC_SSID="UltraHuman-4th Floor"
CONFIG_WIFI_CREDENTIALS_STATIC_PASSWORD="Ultra@Human$!"

# Networking Management API
CONFIG_NET_MGMT=y
CONFIG_NET_MGMT_EVENT=y
CONFIG_NET_MGMT_EVENT_INFO=y
CONFIG_NET_MGMT_EVENT_STACK_SIZE=4096
CONFIG_NET_CONNECTION_MANAGER=y
CONFIG_WIFI_MGMT_EXT=y


# DK library
CONFIG_DK_LIBRARY=n

# System settings
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_NANO=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=n

# Networking
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y
CONFIG_POSIX_MAX_FDS=12

CONFIG_NET_L2_ETHERNET=y
CONFIG_NET_IPV4=y
CONFIG_NET_IPV6=n
CONFIG_NET_TCP=y
CONFIG_NET_DHCPV4=y
CONFIG_DNS_RESOLVER=y

# Memory
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_HEAP_MEM_POOL_SIZE=153600

CONFIG_NET_TCP_WORKQ_STACK_SIZE=2048
CONFIG_NET_TX_STACK_SIZE=4096
CONFIG_NET_RX_STACK_SIZE=4096
CONFIG_NET_BUF_RX_COUNT=20
CONFIG_NET_BUF_TX_COUNT=20

CONFIG_NET_BUF_DATA_SIZE=256
CONFIG_NET_TC_TX_COUNT=0

# # HTTP
# STEP 1 -  Enable the HTTP client library
CONFIG_HTTP_CLIENT=y

CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_PRINTK=y

CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_CBPRINTF_FP_SUPPORT=y

# Enable the UART driver
CONFIG_UART_ASYNC_API=y                             #to enable the asynchronous API of the serial driver.
CONFIG_NRFX_UARTE0=y
CONFIG_SERIAL=y                                     #to enable serial support in code like uart

CONFIG_GPIO=y

# Make sure printk is printing to the UART console
CONFIG_CONSOLE=y
# CONFIG_UART_CONSOLE=n

CONFIG_SETTINGS=y                                   #Enables the settings subsystem
CONFIG_FLASH=y                                      #Enables the flash drivers
CONFIG_FLASH_PAGE_LAYOUT=y                          #API for retrieving the layout of pages
CONFIG_FLASH_MAP=y                                  #Enables the flash map abstraction module
CONFIG_NVS=y                                       #Enables support for non-volatile storage




CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n
# CONFIG_SOC_ENABLE_LFXO=n 

#for system uptime
# CONFIG_TIMESLICING=y

#for sd card
CONFIG_DISK_ACCESS=y

CONFIG_FILE_SYSTEM=y
CONFIG_FAT_FILESYSTEM_ELM=y

# CONFIG_DEBUG_OPTIMIZATIONS=y
CONFIG_DEBUG=n

CONFIG_SIZE_OPTIMIZATIONS=y

# CONFIG_NET_BUF_TX_COUNT=40
# CONFIG_NET_BUF_RX_COUNT=40
# CONFIG_NET_BUF_VARIABLE_DATA_SIZE=y
# CONFIG_NET_RX_STACK_SIZE=4096
# CONFIG_NET_TCP_WORKQ_STACK_SIZE=2048

# CONFIG_NET_PKT_TX_COUNT=20
# CONFIG_NET_PKT_RX_COUNT=20

# CONFIG_NET_BUF_POOL_USAGE=y

# CONFIG_WIFI_LOG_LEVEL_DBG=y
# # Memory statistics and debugging
# CONFIG_THREAD_ANALYZER=y
# CONFIG_THREAD_ANALYZER_AUTO=y
# CONFIG_STACK_SENTINEL=y
# CONFIG_INIT_STACKS=y
# CONFIG_ASSERT=y
# CONFIG_ASSERT_LEVEL=2
# CONFIG_UART_0_NRF_HW_ASYNC=y

# CONFIG_SYS_HEAP_ALLOC_LOOPS=3
# CONFIG_SYS_HEAP_RUNTIME_STATS=y
# CONFIG_PM_DEVICE=n
# CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2
# CONFIG_UART_0_NRF_HW_ASYNC=y

# Microphone (PDM) configuration
CONFIG_NRFX_PDM=y
CONFIG_REBOOT=n

CONFIG_PSA_WANT_ALG_DETERMINISTIC_ECDSA=y
# CONFIG_PSA_WANT_ALG_ECDSA=y
# CONFIG_PSA_WANT_KEY_TYPE_ECC_KEY_PAIR=y
CONFIG_PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY=y

# CONFIG_PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_BASIC=n
CONFIG_PSA_WANT_ALG_HMAC=y


# CONFIG_PRINTK=y
CONFIG_FS_FATFS_LFN=y
CONFIG_TLS_CREDENTIALS=y


CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_SETTINGS=y
CONFIG_SETTINGS_NVS=y

CONFIG_WPA_SUPP_CRYPTO_PSA=y

# # TLS
# # STEP 1.1 - Enable the TLS library and security relevant configurations
CONFIG_NET_SOCKETS_SOCKOPT_TLS=y
CONFIG_TLS_CREDENTIALS=y
CONFIG_MBEDTLS_RSA_C=y
CONFIG_MBEDTLS_DHM_C=y 

# # # STEP 1.2 - Enable support for server name indication (SNI)
CONFIG_MBEDTLS_SSL_SERVER_NAME_INDICATION=y


CONFIG_MBEDTLS=y
CONFIG_MBEDTLS_TLS_LIBRARY=y
CONFIG_TLS_CREDENTIALS_BACKEND_PROTECTED_STORAGE=y


CONFIG_POSIX_CLOCK=y

CONFIG_NET_CONNECTION_MANAGER=y
CONFIG_NET_CONNECTION_MANAGER_MONITOR_STACK_SIZE=1024

# CONFIG_BUILD_WITH_TFM=y

CONFIG_NORDIC_SECURITY_BACKEND=y
CONFIG_CC3XX_BACKEND=y
CONFIG_MBEDTLS_TLS_LIBRARY=y
CONFIG_MBEDTLS_ECDSA_DETERMINISTIC=n
CONFIG_MBEDTLS_SSL_SRV_C=n
CONFIG_MBEDTLS_X509_CSR_WRITE_C=y
CONFIG_MBEDTLS_X509_CREATE_C=y
CONFIG_MBEDTLS_PK_WRITE_C=y
CONFIG_MBEDTLS_SSL_SERVER_NAME_INDICATION=y
CONFIG_MBEDTLS_PKCS1_V15=y

# For hardware crypto accelerator
CONFIG_PSA_CRYPTO_DRIVER_OBERON=n
CONFIG_PSA_CRYPTO_DRIVER_CC3XX=y

CONFIG_MBEDTLS_PSA_CRYPTO_C=y
CONFIG_MBEDTLS_ENABLE_HEAP=y
CONFIG_MBEDTLS_HEAP_SIZE=81920
CONFIG_MBEDTLS_ENABLE_HEAP=y
CONFIG_MBEDTLS_MAC_SHA256_ENABLED=y
# CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=8192
CONFIG_MBEDTLS_TLS_LIBRARY=y
# CONFIG_MBEDTLS=y
# CONFIG_MBEDTLS_ENABLE_HEAP=y
# CONFIG_MBEDTLS_LEGACY_CRYPTO_C=y
# CONFIG_PSA_WANT_RSA_KEY_SIZE_4096=y

# CONFIG_CC3XX_BACKEND=y
# CONFIG_OBERON_BACKEND=n
# CONFIG_MBEDTLS_HEAP_SIZE=81920


#To enable BLE
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="UH_112233445566"
CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1
CONFIG_BT_SETTINGS=y
CONFIG_BT_HCI_IPC=y

# CONFIG_BT_SMP=y
CONFIG_BT_DEVICE_NAME_DYNAMIC=y

# Enable the NUS service
CONFIG_BT_NUS=y

# CONFIG_BT_ATT_PREPARE_COUNT=4
CONFIG_BT_L2CAP_TX_MTU=300
# CONFIG_BT_L2CAP_TX_BUF_COUNT=10
# CONFIG_BT_L2CAP_TX_FRAG_COUNT=15
CONFIG_BT_BUF_EVT_RX_SIZE=251
CONFIG_BT_BUF_CMD_TX_SIZE=251
CONFIG_BT_BUF_ACL_RX_SIZE=300
# CONFIG_BT_BUF_ACL_TX_COUNT=15
# CONFIG_BT_BUF_ACL_TX_SIZE=251
# CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
# CONFIG_BT_CONN_TX_MAX=10

# CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU_SPEEDUP=y
CONFIG_BT_USER_DATA_LEN_UPDATE=y

CONFIG_BT_GATT_CLIENT=y

# CONFIG_BT_NUS_THREAD_STACK_SIZE= 4096


CONFIG_SNTP=y
CONFIG_NET_UDP=y

# CONFIG_HW_STACK_PROTECTION=y
# CONFIG_STACK_CANARIES=y
# CONFIG_STACK_SENTINEL=y
# CONFIG_INIT_STACKS=y
# CONFIG_THREAD_STACK_INFO=y

# CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=2048

# CONFIG_NET_SOCKETS_OFFLOAD=n
# Enable additional buffers
# CONFIG_DNS_RESOLVER_ADDITIONAL_BUF_CTR=5
# # # Enable additional queries
# CONFIG_DNS_RESOLVER_ADDITIONAL_QUERIES=2
# CONFIG_DNS_RESOLVER_MAX_SERVERS=4

CONFIG_NET_LOG=y

# CONFIG_DNS_NUM_CONCUR_QUERIES=2
# CONFIG_DNS_RESOLVER_AI_MAX_ENTRIES=4

# for dns logs
# CONFIG_DNS_RESOLVER_LOG_LEVEL_DBG=y
# CONFIG_NET_SOCKETS_LOG_LEVEL_DBG=y
# # CONFIG_NET_SHELL=y

# CONFIG_NET_CONFIG_SCONFIG_NET_PING=y

# CONFIG_NFCT_PINS_AS_GPIOS=y
# CONFIG_NET_SOCKETS_DNS_TIMEOUT=8000

# # # # DFU THROUGH BLE
CONFIG_BOOTLOADER_MCUBOOT=y
# #Include MCUMGR and the dependencies in the build
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y
# CONFIG_BT_DEBUG_LOG=n

This is my nrf7002dk_nrf5340_cpuapp.conf file

CONFIG_DISK_DRIVER_SDMMC=y
CONFIG_SPI=y
CONFIG_DISK_DRIVERS=y

CONFIG_WIFI_CREDENTIALS_BACKEND_SETTINGS=y

[Amanda Hsieh]

Hi, 

You can refer to Memory footprint optimization or Add an external flash device to store the secondary mcuboot slot. 

Regards,
Amanda H.

[Rakshita]

There is no external flash present in the given module

[Amanda Hsieh]

Refer to the Memory footprint optimization doc. to reduce the size. 

[Rakshita]

I do have sd card in my device so can I use that as an external flash?

[Amanda Hsieh]

Check out this post  Bootloader from SDCard . 

[Rakshita]

But I think I will still face the flash overflow issues as by enabling the below configurations

CONFIG_BOOTLOADER_MCUBOOT=y

CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y

I face the issue, so even if I manage to operate the sd card as an external flash I still need to enable the above configurations and it will still generate overflow issue right?

[Amanda Hsieh]

Yes, I think so. Currently, there is no example of using an SD card as the secondary slot directly. Maybe you can consider DFU over serial (UART or USB) to use single-slot updating. By default, MCUboot splits the non-volatile memory into two slots. If you use Serial Recovery, we can use only one slot instead to get more available non-volatile memory. 

[Rakshita]

Is it possible that I can add a child image for net core and can add the wifi and ble configurations in the net core so that it can consume the network storage for these configurations and the flash would be reduced in the app core?

[Amanda Hsieh]

Unfortunately, no. 

[Rakshita]

 I think my question is a little incorrect. I want to add network related activities in the net core and main application functionalities in the app core. Is that possible?