Load NRF52833-DK code on custom NRF52820

Question

Hi everyone, 
 I have designed a project based on the Radio test example, in the Nordic SDK. After programming all my code on the NRF52833 DK (PCA10100), i decided to design my own pcb and load it with the NRF-DK. As Chip i used the NRF52820. So far so good. I am now running into some compatability issues which im not shure how to fix. 
 
 Checking project status Building ‘Bluetooth_Radio_Periferal’ from solution ‘Bluetooth_Radio_Periferal’ in configuration ‘Debug’ Compiling ‘nrf_log_backend_serial.c’ Compiling ‘nrf_log_backend_rtt.c’ Compiling ‘nrf_log_backend_uart.c’ Compiling ‘nrf_log_default_backends.c’ Compiling ‘nrf_log_frontend.c’ Compiling ‘nrf_log_str_formatter.c’ Compiling ‘boards.c’ Compiling ‘app_error_handler_gcc.c’ Compiling ‘app_error_weak.c’ Compiling ‘app_fifo.c’ Compiling ‘app_timer2.c’ Compiling ‘app_scheduler.c’ Compiling ‘app_uart_fifo.c’ Compiling ‘drv_rtc.c’ Compiling ‘nrf_atfifo.c’ Compiling ‘nrf_atomic.c’ Compiling ‘nrf_cli.c’ Compiling ‘nrf_balloc.c’ Compiling ‘nrf_fprintf.c’ Compiling ‘nrf_cli_uart.c’ Compiling ‘nrf_memobj.c’ Compiling ‘nrf_pwr_mgmt.c’ Compiling ‘nrf_fprintf_format.c’ Compiling ‘nrf_queue.c’ Compiling ‘nrf_ringbuf.c’ Compiling ‘nrf_section_iter.c’ Compiling ‘nrf_sortlist.c’ Compiling ‘retarget.c’ Compiling ‘nrf_strerror.c’ Compiling ‘nrf_drv_clock.c’ Compiling ‘nrf_drv_uart.c’ Compiling ‘nrfx_clock.c’ Compiling ‘nrfx_atomic.c’ Compiling ‘nrfx_prs.c’ Compiling ‘nrfx_timer.c’ Compiling ‘nrfx_uart.c’ Compiling ‘nrfx_uarte.c’ Compiling ‘nrfx_gpiote.c’ Compiling ‘main.c’ Compiling ‘SEGGER_RTT.c’ Compiling ‘SEGGER_RTT_printf.c’ Compiling ‘SEGGER_RTT_Syscalls_SES.c’ Linking Bluetooth_Radio_Periferal.elf Output/Debug/Exe/Bluetooth_Radio_Periferal.elf section `.init' will not fit in region `UNPLACED_SECTIONS' region `UNPLACED_SECTIONS' overflowed by 20648 bytes Output/Bluetooth_Radio_Periferal Debug/Obj/thumb_crt0.o: in function `memory_set': (.init+0xe8): undefined reference to `__data_load_start__' (.init+0xec): undefined reference to `__data_start__' (.init+0xf0): undefined reference to `__data_end__' (.init+0xf4): undefined reference to `__text_load_start__' (.init+0xf8): undefined reference to `__text_start__' (.init+0xfc): undefined reference to `__text_end__' (.init+0x100): undefined reference to `__fast_load_start__' (.init+0x104): undefined reference to `__fast_start__' (.init+0x108): undefined reference to `__fast_end__' (.init+0x10c): undefined reference to `__ctors_load_start__' (.init+0x110): undefined reference to `__ctors_start__' (.init+0x114): undefined reference to `__ctors_end__' (.init+0x118): undefined reference to `__dtors_load_start__' (.init+0x11c): undefined reference to `__dtors_start__' (.init+0x120): undefined reference to `__dtors_end__' (.init+0x124): undefined reference to `__rodata_load_start__' (.init+0x128): undefined reference to `__rodata_start__' (.init+0x12c): undefined reference to `__rodata_end__' (.init+0x130): undefined reference to `__tdata_load_start__' (.init+0x134): undefined reference to `__tdata_start__' (.init+0x138): undefined reference to `__tdata_end__' Output/Bluetooth_Radio_Periferal Debug/Obj/ses_startup_nrf_common.o: in function `InitializeUserMemorySections': (.init+0x3c): undefined reference to `__start_nrf_sections' Output/Bluetooth_Radio_Periferal Debug/Obj/nrf_log_frontend.o: in function `nrf_log_init': nrf_log_frontend.c:(.text.nrf_log_init+0xf0): undefined reference to `__stop_log_const_data' nrf_log_frontend.c:(.text.nrf_log_init+0xf4): undefined reference to `__start_log_const_data' Output/Bluetooth_Radio_Periferal Debug/Obj/nrf_log_frontend.o: in function `nrf_log_module_cnt_get': nrf_log_frontend.c:(.text.nrf_log_module_cnt_get+0xc): undefined reference to `__stop_log_const_data' nrf_log_frontend.c:(.text.nrf_log_module_cnt_get+0x10): undefined reference to `__start_log_const_data' Output/Bluetooth_Radio_Periferal Debug/Obj/nrf_log_frontend.o: in function `nrf_log_frontend_dequeue': nrf_log_frontend.c:(.text.nrf_log_frontend_dequeue+0x3fc): undefined reference to `__start_log_const_data' Output/Bluetooth_Radio_Periferal Debug/Obj/app_error_weak.o: in function `app_error_fault_handler': app_error_weak.c:(.text.app_error_fault_handler+0x11c): undefined reference to `__start_log_const_data' Output/Bluetooth_Radio_Periferal Debug/Obj/drv_rtc.o: in function `drv_rtc_init': drv_rtc.c:(.text.drv_rtc_init+0x104): undefined reference to `__start_log_const_data' Build failed 
 
 It has probably to do with some config files which im not aware of how to edit. 
 Please help, the deadline is comming closer. 
 
 Best regards Maikel