Segger Embedded Studio -`UNPLACED_SECTIONS' problem

[Piotr Fiszer]

Hello,

I try to start developing my nrf51/nrf52 projects using Segger Embedded Studio but each time I receive the same linker error:

"(...) section fs_data' will not fit in regionUNPLACED_SECTIONS'"

In my case fds.c or fstorage.c is the problem but i saw at this forum that others have problems with diffrent libraries.

Looking forward to any help. Cheers!

EDIT: For better readability I will try to add more detail of the problem:

I import Keil 4 project into Segger E. Studio. I follow the import procedure located at this topic: devzone.nordicsemi.com/.../

the exact error message I receive is:

"(...) section fs_data' will not fit in regionUNPLACED_SECTIONS'"

"section fs_data loaded at [00000000,0000000f] overlaps section .vectors loaded at [00000000,000000a7]"

"region `UNPLACED_SECTIONS' overflowed by 17 bytes"

Next thing is I know where sections are defined (flash_placement.xml) but I have no idea what and how to change to make fs_data fit into the sections. I also found the .c file section options view (properties of the file -> secition options) but again nothing helpful is there.

I still try to dig the problem - If i find sth I will edit this post

[Piotr Fiszer]

I almost got it:

It was enough to add fs_data line in flash_placement.xml to get rid of UNPLACED_SECTIONS linker error:

<!DOCTYPE Linker_Placement_File>
<Root name="Flash Section Placement">
  <MemorySegment name="$(FLASH_NAME:FLASH)">
    <ProgramSection alignment="0x100" load="Yes" name=".vectors" start="$(FLASH_START:)" />
    <ProgramSection alignment="4" load="Yes" name="fs_data" />
    <ProgramSection alignment="4" los" name=".init" /> 
    (...)

That fallowed to lack of __stop_fs_data and __start_fs_data definitions. Then I found this:

Linker scripts

Keil does not require linker scripts. Named sections are generated automatically when registration macros are invoked.

For GCC compilations, you must add a definition for a linker script used in the compilation.This addition should be at the root level of the linker script file:

SECTIONS { .fs_data_out ALIGN(4):
{ PROVIDE( __start_fs_data = .); KEEP(*(fs_data)) PROVIDE( __stop_fs_data = .); } = 0 } This definition will add a named section fs_data that is aligned to a word and that has __start_fs_data and __stop_fs_data as symbols that are used from the code.

For IAR compilations, you must make additions to an ilink file.

in Nordic InfoCenter infocenter.nordicsemi.com/index.jsp

It should be super easy from this point. BUT I try to attach this simple linker script to Segger E. Studio without success... Help will be appreciated. How to do it properly?

EDIT + FINAL ANSWER:

devzone.nordicsemi.com/.../ finally solved the problem (notice the dot "." in front of fs_data section definition in this solution!)

topic to close

[Meera Shah]

This is my flash_placement.xml file.

<!DOCTYPE Linker_Placement_File>
<Root name="Flash Section Placement">
  <MemorySegment name="$(FLASH_NAME:FLASH)">
    <ProgramSection alignment="0x100" load="Yes" name=".vectors" start="$(FLASH_START:)" />
    <ProgramSection alignment="4" load="Yes" name=".init" />
    <ProgramSection alignment="4" load="Yes" name=".init_rodata" />
    <ProgramSection alignment="4" load="Yes" name=".text" />
    <ProgramSection alignment="4" load="Yes" name=".dtors" />
    <ProgramSection alignment="4" load="Yes" name=".ctors" />
    <ProgramSection alignment="4" load="Yes" name=".rodata" />
    <ProgramSection alignment="4" keep="Yes" load="Yes" name=".dfu_trans" inputsections="*(SORT(.dfu_trans*))" address_symbol="__start_dfu_trans" end_symbol="__stop_dfu_trans" />
    <ProgramSection alignment="4" load="Yes" name=".ARM.exidx" address_symbol="__exidx_start" end_symbol="__exidx_end" />
    <ProgramSection alignment="4" load="Yes" runin=".fast_run" name=".fast" />
    <ProgramSection alignment="4" load="Yes" runin=".data_run" name=".data" />
    <ProgramSection alignment="4" load="Yes" runin=".tdata_run" name=".tdata" />
    <ProgramSection alignment="4" keep="Yes" load="Yes" runin=".fs_data_run" name=".fs_data" />
  </MemorySegment>
  <MemorySegment name="$(RAM_NAME:RAM);SRAM">
    <ProgramSection alignment="0x100" load="No" name=".vectors_ram" start="$(RAM_START:$(SRAM_START:))" />
    <ProgramSection alignment="4" load="No" name=".fast_run" />
    <ProgramSection alignment="4" load="No" name=".data_run" />
    <ProgramSection alignment="4" load="No" name=".tdata_run" />
    <ProgramSection alignment="4" load="No" keep="Yes" name=".fs_data_run" address_symbol="__start_fs_data" end_symbol="__stop_fs_data" />
    <ProgramSection alignment="4" load="No" name=".bss" />
    <ProgramSection alignment="4" load="No" name=".tbss" />
    <ProgramSection alignment="4" load="No" name=".non_init" />
    <ProgramSection alignment="4" size="__HEAPSIZE__" load="No" name=".heap" />
    <ProgramSection alignment="8" size="__STACKSIZE__" load="No" place_from_segment_end="Yes" name=".stack" />
    <ProgramSection alignment="8" size="__STACKSIZE_PROCESS__" load="No" name=".stack_process" />
  </MemorySegment>
  <MemorySegment name="$(FLASH2_NAME:FLASH2)">
    <ProgramSection alignment="4" load="Yes" name=".text2" />
    <ProgramSection alignment="4" load="Yes" name=".rodata2" />
    <ProgramSection alignment="4" load="Yes" runin=".data2_run" name=".data2" />
  </MemorySegment>
  <MemorySegment name="$(RAM2_NAME:RAM2)">
    <ProgramSection alignment="4" load="No" name=".data2_run" />
    <ProgramSection alignment="4" load="No" name=".bss2" />
  </MemorySegment>

</Root>




I am getting this error `UNPLACED_SECTIONS' overflowed by 1024 bytes. Can you help me with this?