ram size reduction options with zephyr

Question

hello Nordic 
 
 i am want to run an ncs based application (that is running on nrf52840, -> trying to create single code for 2 boards i have), when i set to run the same application on the nrf52832 i see compilation fails cause not enough space for ram. so to see where i stand and how/what i can reduce in ram i tested how much ram is taken for the simplest peripheral example. 
 here are the results: 
 Path Size % 
==============================================================================================================
Root 30888 100.00%
├── (hidden) 3065 9.92%
├── (no paths) 5076 16.43%
│ ├── SystemCoreClock 4 0.01%
│ ├── _SEGGER_RTT 168 0.54%
│ ├── __compound_literal.0 24 0.08%
│ ├── __compound_literal.1 24 0.08%
│ ├── __compound_literal.10 20 0.06%
│ ├── __compound_literal.11 20 0.06%
│ ├── __compound_literal.12 24 0.08%
│ ├── __compound_literal.13 20 0.06%
│ ├── __compound_literal.14 12 0.04%
│ ├── __compound_literal.15 9 0.03%
│ ├── __compound_literal.16 4 0.01%
│ ├── __compound_literal.17 10 0.03%
│ ├── __compound_literal.18 8 0.03%
│ ├── __compound_literal.19 20 0.06%
│ ├── __compound_literal.2 28 0.09%
│ ├── __compound_literal.20 4 0.01%
│ ├── __compound_literal.21 4 0.01%
│ ├── __compound_literal.22 4 0.01%
│ ├── __compound_literal.23 8 0.03%
│ ├── __compound_literal.24 4 0.01%
│ ├── __compound_literal.25 4 0.01%
│ ├── __compound_literal.26 4 0.01%
│ ├── __compound_literal.27 8 0.03%
│ ├── __compound_literal.28 4 0.01%
│ ├── __compound_literal.3 24 0.08%
│ ├── __compound_literal.4 64 0.21%
│ ├── __compound_literal.5 24 0.08%
│ ├── __compound_literal.6 28 0.09%
│ ├── __compound_literal.7 84 0.27%
│ ├── __compound_literal.8 28 0.09%
│ ├── __compound_literal.9 16 0.05%
│ ├── _kernel 48 0.16%
│ ├── _sw_isr_table 312 1.01%
│ ├── bt_auth 4 0.01%
│ ├── bt_dev 504 1.63%
│ ├── cli.2 16 0.05%
│ ├── default_settings_nvs.0 64 0.21%
│ ├── dev.0 4 0.01%
│ ├── dynamic_regions.0 12 0.04%
│ ├── events.0 60 0.19%
│ ├── gpio_initialized.0 1 0.00%
│ ├── hci_buffer.0 73 0.24%
│ ├── heartrate.0 1 0.00%
│ ├── hrm.0 2 0.01%
│ ├── ident.1 1 0.00%
│ ├── k_sys_work_q 160 0.52%
│ ├── on.3 4 0.01%
│ ├── once.1 1 0.00%
│ ├── ops.0 32 0.10%
│ ├── pub_key_cb.0 8 0.03%
│ ├── rtt_term_mutex 20 0.06%
│ ├── settings_handlers 8 0.03%
│ ├── settings_load_srcs 8 0.03%
│ ├── settings_save_dst 4 0.01%
│ ├── str.1 30 0.10%
│ ├── str.3 129 0.42%
│ ├── sym_4UPCEGANXTW4CY2APTG4M3ASURYRAOSICOABFVQ 4 0.01%
│ ├── sym_BQU3DXYQO6CVRTZ73QCZ3ROACVRWF5BM63HWZBA 4 0.01%
│ ├── sym_I2ECAHYJUC2B2QUHO3QKLB2MXHP4E2UH6ISXFDY 4 0.01%
│ ├── sym_RIJRDO5P75BJM27PPQHZSDMFCKFZWFJNGCJA52I 4 0.01%
│ ├── sym_SXHUVOM4EI7L4NGF2KWSQ6ZLB3KNNMW76PXITUA 467 1.51%
│ ├── sym_VQ35Q3R547AGSAUE3MG4FJPAHAQLVUOXVCL6PHY 3 0.01%
│ ├── sym_X2CGJY32WPU5QR6XFTHTAS6KO4LV2ENSTHTXMQI 28 0.09%
│ ├── sym_Z5WZCMHZDI7RNMVB5GZYQIRS7P3BTO7552UV62I 1 0.00%
│ ├── sym_ZBLSXVK5T67DMHUVRGQNLJO5IMUQ4ERRIIDJ55A 4 0.01%
│ ├── wait_q.0 8 0.03%
│ ├── z_idle_threads 128 0.41%
│ ├── z_interrupt_stacks 2080 6.73%
│ └── z_main_thread 128 0.41%
├── / 304 0.98%
│ └── home 304 0.98%
│ └── zhershkovitch 304 0.98%
│ └── workspace 304 0.98%
│ └── sample_test 304 0.98%
│ └── peripheral 304 0.98%
│ └── src 304 0.98%
│ ├── cts.c 11 0.04%
│ │ ├── ct 10 0.03%
│ │ └── ct_update 1 0.00%
│ └── main.c 293 0.95%
│ ├── auth_cb_display 36 0.12%
│ ├── conn_callbacks 28 0.09%
│ ├── gatt_callbacks 8 0.03%
│ ├── ind_params 24 0.08%
│ ├── indicating 1 0.00%
│ ├── signed_value 4 0.01%
│ ├── simulate_vnd 1 0.00%
│ ├── vnd_auth_uuid 17 0.06%
│ ├── vnd_auth_value 21 0.07%
│ ├── vnd_enc_uuid 17 0.06%
│ ├── vnd_long_cep 2 0.01%
│ ├── vnd_long_value 75 0.24%
│ ├── vnd_uuid 17 0.06%
│ ├── vnd_value 21 0.07%
│ └── vnd_wwr_value 21 0.07%
├── WORKSPACE 5513 17.85%
│ ├── modules 1128 3.65%
│ │ ├── crypto 4 0.01%
│ │ │ └── tinycrypt 4 0.01%
│ │ │ └── lib 4 0.01%
│ │ │ └── source 4 0.01%
│ │ │ └── ecc.c 4 0.01%
│ │ │ └── g_rng_function 4 0.01%
│ │ ├── debug 1040 3.37%
│ │ │ └── segger 1040 3.37%
│ │ │ └── SEGGER 1040 3.37%
│ │ │ └── SEGGER_RTT.c 1040 3.37%
│ │ │ ├── _acDownBuffer 16 0.05%
│ │ │ └── _acUpBuffer 1024 3.32%
│ │ └── hal 84 0.27%
│ │ └── nordic 84 0.27%
│ │ └── nrfx 84 0.27%
│ │ └── drivers 84 0.27%
│ │ └── src 84 0.27%
│ │ ├── nrfx_gpiote.c 80 0.26%
│ │ │ └── m_cb 80 0.26%
│ │ └── nrfx_ppi.c 4 0.01%
│ │ └── m_channels_allocated 4 0.01%
│ └── nrf 4385 14.20%
│ ├── drivers 72 0.23%
│ │ └── mpsl 72 0.23%
│ │ ├── clock_control 4 0.01%
│ │ │ └── nrfx_clock_mpsl.c 4 0.01%
│ │ │ └── event_handler 4 0.01%
│ │ └── flash_sync 68 0.22%
│ │ └── flash_sync_mpsl.c 68 0.22%
│ │ └── _context 68 0.22%
│ ├── lib 20 0.06%
│ │ └── multithreading_lock 20 0.06%
│ │ └── multithreading_lock.c 20 0.06%
│ │ └── mpsl_lock 20 0.06%
│ └── subsys 4293 13.90%
│ ├── bluetooth 3049 9.87%
│ │ └── controller 3049 9.87%
│ │ ├── hci_driver.c 2978 9.64%
│ │ │ ├── entropy_source 4 0.01%
│ │ │ ├── recv_thread_data 128 0.41%
│ │ │ ├── recv_thread_stack 1056 3.42%
│ │ │ ├── sdc_mempool 1766 5.72%
│ │ │ └── sem_recv 24 0.08%
│ │ └── hci_internal.c 71 0.23%
│ │ └── cmd_complete_or_status 71 0.23%
│ └── mpsl 1244 4.03%
│ └── init 1244 4.03%
│ └── mpsl_init.c 1244 4.03%
│ ├── sem_signal 24 0.08%
│ ├── signal_thread_data 128 0.41%
│ ├── signal_thread_stack 1056 3.42%
│ └── timeslot_context 36 0.12%
└── ZEPHYR_BASE 16930 54.81%
 ├── arch 1 0.00%
 │ └── arm 1 0.00%
 │ └── core 1 0.00%
 │ └── aarch32 1 0.00%
 │ └── mpu 1 0.00%
 │ └── arm_mpu.c 1 0.00%
 │ └── static_regions_num 1 0.00%
 ├── drivers 292 0.95%
 │ ├── clock_control 88 0.28%
 │ │ └── clock_control_nrf.c 88 0.28%
 │ │ ├── __devstate_dts_ord_26 4 0.01%
 │ │ ├── data 80 0.26%
 │ │ └── hfclk_users 4 0.01%
 │ ├── console 4 0.01%
 │ │ └── uart_console.c 4 0.01%
 │ │ └── uart_console_dev 4 0.01%
 │ ├── entropy 88 0.28%
 │ │ └── entropy_nrf5.c 88 0.28%
 │ │ ├── __devstate_dts_ord_36 4 0.01%
 │ │ └── entropy_nrf5_data 84 0.27%
 │ ├── flash 36 0.12%
 │ │ └── soc_flash_nrf.c 36 0.12%
 │ │ ├── __devstate_dts_ord_52 4 0.01%
 │ │ ├── dev_layout 8 0.03%
 │ │ └── sem_lock 24 0.08%
 │ ├── gpio 32 0.10%
 │ │ └── gpio_nrfx.c 32 0.10%
 │ │ ├── __devstate_dts_ord_10 4 0.01%
 │ │ └── gpio_nrfx_p0_data 28 0.09%
 │ ├── serial 24 0.08%
 │ │ └── uart_nrfx_uarte.c 24 0.08%
 │ │ ├── __devstate_dts_ord_49 4 0.01%
 │ │ └── uarte_0_data 20 0.06%
 │ └── timer 20 0.06%
 │ ├── nrf_rtc_timer.c 16 0.05%
 │ │ ├── cc_data 8 0.03%
 │ │ ├── int_mask 4 0.01%
 │ │ └── last_count 4 0.01%
 │ └── sys_clock_init.c 4 0.01%
 │ └── __devstate_sys_init_sys_clock_driver_init0 4 0.01%
 ├── kernel 3529 11.43%
 │ ├── init.c 1409 4.56%
 │ │ ├── z_idle_stacks 352 1.14%
 │ │ ├── z_main_stack 1056 3.42%
 │ │ └── z_sys_post_kernel 1 0.00%
 │ ├── sched.c 12 0.04%
 │ │ ├── pending_current 4 0.01%
 │ │ ├── slice_max_prio 4 0.01%
 │ │ └── slice_time 4 0.01%
 │ ├── system_work_q.c 2080 6.73%
 │ │ └── sys_work_q_stack 2080 6.73%
 │ ├── timeout.c 20 0.06%
 │ │ ├── announce_remaining 4 0.01%
 │ │ ├── curr_tick 8 0.03%
 │ │ └── timeout_list 8 0.03%
 │ └── work.c 8 0.03%
 │ └── pending_cancels 8 0.03%
 ├── lib 8 0.03%
 │ ├── libc 4 0.01%
 │ │ └── minimal 4 0.01%
 │ │ └── source 4 0.01%
 │ │ └── stdout 4 0.01%
 │ │ └── stdout_console.c 4 0.01%
 │ │ └── _stdout_hook 4 0.01%
 │ └── os 4 0.01%
 │ └── printk.c 4 0.01%
 │ └── _char_out 4 0.01%
 └── subsys 13100 42.41%
 ├── bluetooth 10270 33.25%
 │ ├── host 10261 33.22%
 │ │ ├── att.c 1077 3.49%
 │ │ │ ├── _k_mem_slab_buf_att_slab 68 0.22%
 │ │ │ ├── _k_mem_slab_buf_chan_slab 328 1.06%
 │ │ │ ├── _k_mem_slab_buf_req_slab 84 0.27%
 │ │ │ ├── att_slab 28 0.09%
 │ │ │ ├── cancel 28 0.09%
 │ │ │ ├── chan_slab 28 0.09%
 │ │ │ ├── net_buf_data_prep_pool 325 1.05%
 │ │ │ ├── net_buf_prep_pool 120 0.39%
 │ │ │ ├── prep_pool 40 0.13%
 │ │ │ └── req_slab 28 0.09%
 │ │ ├── buf.c 1328 4.30%
 │ │ │ ├── discardable_pool 40 0.13%
 │ │ │ ├── hci_rx_pool 40 0.13%
 │ │ │ ├── net_buf_data_discardable_pool 135 0.44%
 │ │ │ ├── net_buf_data_hci_rx_pool 730 2.36%
 │ │ │ ├── net_buf_data_num_complete_pool 7 0.02%
 │ │ │ ├── net_buf_discardable_pool 72 0.23%
 │ │ │ ├── net_buf_hci_rx_pool 240 0.78%
 │ │ │ ├── net_buf_num_complete_pool 24 0.08%
 │ │ │ └── num_complete_pool 40 0.13%
 │ │ ├── conn.c 765 2.48%
 │ │ │ ├── acl_conns 192 0.62%
 │ │ │ ├── acl_tx_pool 40 0.13%
 │ │ │ ├── callback_list 4 0.01%
 │ │ │ ├── conn_change 16 0.05%
 │ │ │ ├── conn_tx 48 0.16%
 │ │ │ ├── frag_pool 40 0.13%
 │ │ │ ├── free_tx 24 0.08%
 │ │ │ ├── net_buf_acl_tx_pool 72 0.23%
 │ │ │ ├── net_buf_data_acl_tx_pool 219 0.71%
 │ │ │ ├── net_buf_data_frag_pool 62 0.20%
 │ │ │ └── net_buf_frag_pool 48 0.16%
 │ │ ├── ecc.c 76 0.25%
 │ │ │ ├── dh_key_cb 4 0.01%
 │ │ │ ├── pub_key 64 0.21%
 │ │ │ └── pub_key_cb_slist 8 0.03%
 │ │ ├── gatt.c 330 1.07%
 │ │ │ ├── callback_list 8 0.03%
 │ │ │ ├── cf_cfg 32 0.10%
 │ │ │ ├── db_hash 120 0.39%
 │ │ │ ├── gatt_sc 88 0.28%
 │ │ │ ├── init 4 0.01%
 │ │ │ ├── last_static_handle 2 0.01%
 │ │ │ ├── sc_ccc 24 0.08%
 │ │ │ ├── sc_cfg 24 0.08%
 │ │ │ ├── sc_restore_params 24 0.08%
 │ │ │ └── service_init 4 0.01%
 │ │ ├── hci_core.c 4314 13.97%
 │ │ │ ├── cmd_data 24 0.08%
 │ │ │ ├── disconnected_handles 2 0.01%
 │ │ │ ├── hci_cmd_pool 40 0.13%
 │ │ │ ├── net_buf_data_hci_cmd_pool 140 0.45%
 │ │ │ ├── net_buf_hci_cmd_pool 48 0.16%
 │ │ │ ├── ready_cb 4 0.01%
 │ │ │ ├── rx_thread_data 128 0.41%
 │ │ │ ├── rx_thread_stack 2232 7.23%
 │ │ │ ├── tx_thread_data 128 0.41%
 │ │ │ └── tx_thread_stack 1568 5.08%
 │ │ ├── hci_ecc.c 1428 4.62%
 │ │ │ ├── cmd_sem 24 0.08%
 │ │ │ ├── ecc 96 0.31%
 │ │ │ ├── ecc_thread_data 128 0.41%
 │ │ │ ├── ecc_thread_stack 1176 3.81%
 │ │ │ └── flags 4 0.01%
 │ │ ├── keys.c 144 0.47%
 │ │ │ ├── aging_counter_val 4 0.01%
 │ │ │ ├── key_pool 136 0.44%
 │ │ │ └── last_keys_updated 4 0.01%
 │ │ ├── l2cap.c 232 0.75%
 │ │ │ └── bt_l2cap_pool 232 0.75%
 │ │ ├── settings.c 16 0.05%
 │ │ │ └── save_id_work 16 0.05%
 │ │ └── smp.c 551 1.78%
 │ │ ├── bondable 1 0.00%
 │ │ ├── bt_smp_pool 520 1.68%
 │ │ ├── oobd_present 1 0.00%
 │ │ ├── sc_local_pkey_ready 24 0.08%
 │ │ ├── sc_public_key 4 0.01%
 │ │ └── sc_supported 1 0.00%
 │ └── services 9 0.03%
 │ ├── bas.c 1 0.00%
 │ │ └── battery_level 1 0.00%
 │ ├── dis.c 7 0.02%
 │ │ └── dis_pnp_id 7 0.02%
 │ └── hrs.c 1 0.00%
 │ └── hrs_blsc 1 0.00%
 ├── logging 2765 8.95%
 │ ├── log_backend_rtt.c 38 0.12%
 │ │ ├── backend_cb_log_backend_rtt 8 0.03%
 │ │ ├── char_buf 16 0.05%
 │ │ ├── host_present 1 0.00%
 │ │ ├── log_output_rtt_control_block 12 0.04%
 │ │ └── panic_mode 1 0.00%
 │ ├── log_backend_uart.c 25 0.08%
 │ │ ├── backend_cb_log_backend_uart 8 0.03%
 │ │ ├── log_output_uart_control_block 12 0.04%
 │ │ ├── uart_dev 4 0.01%
 │ │ └── uart_output_buf 1 0.00%
 │ ├── log_core.c 1642 5.32%
 │ │ ├── backend_attached 1 0.00%
 │ │ ├── buffered_cnt 4 0.01%
 │ │ ├── dropped_cnt 4 0.01%
 │ │ ├── initialized 4 0.01%
 │ │ ├── list 8 0.03%
 │ │ ├── log_process_thread_sem 24 0.08%
 │ │ ├── log_process_thread_timer 56 0.18%
 │ │ ├── log_strdup_pool 28 0.09%
 │ │ ├── log_strdup_pool_buf 576 1.86%
 │ │ ├── logging_stack 800 2.59%
 │ │ ├── logging_thread 128 0.41%
 │ │ ├── panic_mode 1 0.00%
 │ │ ├── proc_tid 4 0.01%
 │ │ └── timestamp_func 4 0.01%
 │ ├── log_msg.c 1052 3.41%
 │ │ ├── log_msg_pool 28 0.09%
 │ │ └── log_msg_pool_buf 1024 3.32%
 │ └── log_output.c 8 0.03%
 │ ├── freq 4 0.01%
 │ └── timestamp_div 4 0.01%
 ├── pm 24 0.08%
 │ └── power.c 24 0.08%
 │ ├── pm_notifiers 8 0.03%
 │ ├── post_ops_done 4 0.01%
 │ └── z_power_state 12 0.04%
 ├── settings 37 0.12%
 │ └── src 37 0.12%
 │ ├── settings.c 20 0.06%
 │ │ └── settings_lock 20 0.06%
 │ ├── settings_init.c 1 0.00%
 │ │ └── settings_subsys_initialized 1 0.00%
 │ └── settings_nvs.c 16 0.05%
 │ └── settings_nvs_itf 16 0.05%
 └── storage 4 0.01%
 └── flash_map 4 0.01%
 └── flash_map_default.c 4 0.01%
 └── flash_map 4 0.01%
==============================================================================================================
 30888
 
 it takes almost half the ram of the nrf52832 
 and it seems to me very poor situation, any ideas how can i reduce ram take with ncs ? 
 obviously i have many more things on my app that i will try to reduce but currently zephyr part in my app takes 80% of the ram ... it looks like there was no way for ncs supporting the smaller socs (below nrf52840, nrf53, nrf9160 etc.) 
 what is your say/ advice on that matter (and ideas for reducing ram take )? 
 hope to read from you soon 
 best regards 
 Ziv

ziv123 · Accepted Answer

hi Hung 
 Hung Bui said: I noticed that you have both I2C(TWI) and SPI enable. Please be aware that that they share the same instance ID and can't be used at the same time (for example SPI0 and TWI0) 
 yes i am aware of that but thanks for mentioning 
 i have managed to build and run and i will put my configs here to maybe help some searchers 
 #prj.conf
CONFIG_NUM_COOP_PRIORITIES=5
CONFIG_NUM_PREEMPT_PRIORITIES=10

CONFIG_NEWLIB_LIBC=y
CONFIG_CMSIS_DSP=y
CONFIG_CMSIS_DSP_FASTMATH=y
CONFIG_CMSIS_DSP_TRANSFORM=y
CONFIG_CMSIS_DSP_FILTERING=y
CONFIG_CMSIS_DSP_SUPPORT=y

CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_CBPRINTF_FP_SUPPORT=y

#Allow use of legacy devicetree macros
# CONFIG_LEGACY_DEVICETREE_MACROS=y

CONFIG_NO_OPTIMIZATIONS=n #Compiler optimizations will be set to -O0 independently of other options.
CONFIG_SIZE_OPTIMIZATIONS=y #Compiler optimizations will be set to -Os independently of other options.
CONFIG_SPEED_OPTIMIZATIONS=n #Compiler optimizations will be set to -O2 independently of other options.
CONFIG_DEBUG_OPTIMIZATIONS=n #Compiler optimizations will be set to -Og independently of other options.

CONFIG_TINYCBOR=y
CONFIG_CBOR_FLOATING_POINT=y

# BLE Related Configs
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME_DYNAMIC=y
CONFIG_BT_TPS=y
CONFIG_BT_DIS=y
CONFIG_BT_DIS_PNP=n
CONFIG_BT_DIS_MANUF="Augury Inc."
CONFIG_BT_DIS_SERIAL_NUMBER=y
CONFIG_BT_DIS_FW_REV=y
CONFIG_BT_DIS_HW_REV=y
CONFIG_BT_DIS_SW_REV=n
CONFIG_BT_CTLR_TX_PWR_PLUS_8=y

# Below is setup to let DIS information be read from settings
CONFIG_SETTINGS_RUNTIME=y
CONFIG_SETTINGS=y
CONFIG_SETTINGS_NONE=y
CONFIG_BT_SETTINGS=y
CONFIG_BT_DIS_SETTINGS=y
CONFIG_BT_DIS_STR_MAX=50
CONFIG_BT_GATT_CACHING=n
CONFIG_BT_HCI_VS_EXT=n
CONFIG_BT_LL_SW_SPLIT=y

# I2C Related Configs
CONFIG_I2C=y
CONFIG_I2C_0=n
CONFIG_I2C_GPIO=y

# ADC Related Configs
CONFIG_ADC=y
CONFIG_ADC_ASYNC=y

# Enable mcumgr.
CONFIG_MCUMGR=y

CONFIG_ASSERT=y
CONFIG_WATCHDOG=y


# Ensure an MCUboot-compatible binary is generated.
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_MCUBOOT_SIGNATURE_KEY_FILE="root-rsa-2048.pem" #mcuboot key
CONFIG_MCUBOOT_IMAGE_VERSION="1.1.3"
CONFIG_MCUBOOT_IMG_MANAGER=y

# Allow for large Bluetooth data packets.
CONFIG_BT_L2CAP_TX_MTU=252
CONFIG_BT_BUF_ACL_RX_SIZE=256
CONFIG_BT_BUF_ACL_TX_SIZE=251
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
CONFIG_BT_USER_DATA_LEN_UPDATE=y


# Enable the Bluetooth (unauthenticated) and shell mcumgr transports.
CONFIG_MCUMGR_SMP_BT=y
CONFIG_MCUMGR_SMP_BT_AUTHEN=n

# Enable flash operations.
CONFIG_FLASH=y
CONFIG_FLASH_JESD216_API=y
CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=n

# Enable the LittleFS file system.
CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

# Required by the `taskstat` command.
CONFIG_THREAD_MONITOR=y

# Enable statistics and statistic names.
CONFIG_STATS=y
CONFIG_STATS_NAMES=y

# Enable all core commands.
CONFIG_MCUMGR_CMD_FS_MGMT=y
CONFIG_MCUMGR_CMD_IMG_MGMT=y
CONFIG_MCUMGR_CMD_OS_MGMT=y
CONFIG_MCUMGR_CMD_STAT_MGMT=y


# sensors
CONFIG_NRFX_GPIOTE=y
CONFIG_NRFX_PPI=y
CONFIG_NRFX_TIMER0=y
CONFIG_NRFX_TIMER1=y
CONFIG_NRFX_TIMER2=y
CONFIG_NRFX_TIMER3=y
CONFIG_NRFX_TIMER4=y
CONFIG_SPI=y
CONFIG_SPI_ASYNC=y


CONFIG_GPIO=y

# LOG
CONFIG_LOG=y
CONFIG_LOG_PRINTK=y
CONFIG_LOG_BUFFER_SIZE=2048
CONFIG_LOG_BACKEND_FORMAT_TIMESTAMP=n

# enable console over SEGGER RTT
CONFIG_CONSOLE=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_SEGGER_RTT_BUFFER_SIZE_UP=8192

CONFIG_SENSOR=y
CONFIG_TEMP_NRF5=y
CONFIG_IIS3DWB=y
CONFIG_IIS3DWB_CALC_REAL_ODR=y
CONFIG_IIS3DWB_TRIGGER_OWN_THREAD=y
CONFIG_IIS3DWB_FIFO_TH=36
CONFIG_IIS3DWB_TEMPERATURE_SUPPORT=y
CONFIG_IIS3DWB_FIFO_DATA_READY_INT_PIN_1=y

#myboard.conf
CONFIG_AUGU_GPIO_POWER=y 


CONFIG_FPU=y
CONFIG_PM_DEVICE=y


# SPI Flash
CONFIG_SPI=y
CONFIG_SPI_NOR=y
CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096

# Enable flash operations.
CONFIG_FLASH_MAP=y
CONFIG_FLASH_TESTS=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_25LP128=y

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_BT_RX_STACK_SIZE=1024

# CONFIG_MAIN_STACK_SIZE=1024
CONFIG_MPSL_SIGNAL_STACK_SIZE=640

CONFIG_IDLE_STACK_SIZE=128
CONFIG_ISR_STACK_SIZE=1024
# keep CONFIG_HEAP_MEM_POOL_SIZE=16384 because this is needed by usb /nrfx modules
# CONFIG_HEAP_MEM_POOL_SIZE=16384
# CONFIG_HEAP_MEM_POOL_SIZE=10240
# CONFIG_HEAP_MEM_POOL_SIZE=8192
# CONFIG_HEAP_MEM_POOL_SIZE=4096
# CONFIG_HEAP_MEM_POOL_SIZE=3600
# CONFIG_HEAP_MEM_POOL_SIZE=2048
CONFIG_HEAP_MEM_POOL_SIZE=1024

CONFIG_NRFX_SPIM=y
CONFIG_NRFX_SPIM1=y

CONFIG_SOC_NRF52832_ALLOW_SPIM_DESPITE_PAN_58=y

# CONFIG_SERIAL=n

# Configurations set based on thread analyzer output.
# CONFIG_SDC_RX_STACK_SIZE=324
CONFIG_BT_HCI_TX_STACK_SIZE_WITH_PROMPT=y
CONFIG_BT_HCI_TX_STACK_SIZE=640


# Disable features not needed
# CONFIG_TIMESLICING=n
# CONFIG_MINIMAL_LIBC_MALLOC=n

# Disable Bluetooth features not needed
# CONFIG_BT_DEBUG_NONE=y
# CONFIG_BT_ASSERT=n
# CONFIG_BT_DATA_LEN_UPDATE=n
CONFIG_BT_PHY_UPDATE=n
# CONFIG_BT_GATT_CACHING=n
# CONFIG_BT_GATT_SERVICE_CHANGED=n
# CONFIG_BT_GAP_PERIPHERAL_PREF_PARAMS=n
# CONFIG_BT_SETTINGS_CCC_LAZY_LOADING=y
# CONFIG_BT_HCI_VS_EXT=n


# Disable Bluetooth controller features not needed
CONFIG_BT_CTLR_PRIVACY=n
CONFIG_BT_CTLR_PHY_2M=n
# Reduce Bluetooth buffers
CONFIG_BT_BUF_EVT_DISCARDABLE_COUNT=1
CONFIG_BT_BUF_EVT_DISCARDABLE_SIZE=43
CONFIG_BT_BUF_EVT_RX_COUNT=2

CONFIG_BT_CONN_TX_MAX=2
CONFIG_BT_L2CAP_TX_BUF_COUNT=2
CONFIG_BT_CTLR_RX_BUFFERS=1
CONFIG_BT_BUF_ACL_TX_COUNT=3
CONFIG_BT_BUF_ACL_TX_SIZE=27
 
 my issue now is actually working with spi_nor module for an external flash i have, i opened a new thread for that: 
 https://devzone.nordicsemi.com/f/nordic-q-a/88263/using-spi_nor-driver-with-nrf-sdk-connect-zephyr---driver-not-found 
 best regards 
 Ziv

ram size reduction options with zephyr

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