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    • Some undefined references

    Posted by electr0dave on 2016-06-16 10:42

    Hello.

    I'm a new user of System Workbench for STM32.
    When I create the configurations with CubeMX and import the project all works fine.
    But when I "re-open" the CubeMX and make some changes, the compilation start to give errors.

    In this case, the errors are:

    Building target: UDP_coupler.elf
    Invoking: MCU G++ Linker
    arm-none-eabi-g++ -mcpu=cortex-m7 -mthumb -mfloat-abi=softfp -mfpu=fpv5-sp-d16 -Wl,-Map=output.map -Wl,--gc-sections -fno-exceptions -fno-rtti -lm -o "UDP_coupler.elf" @"objects.list"
    c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.7.0.201602121829/tools/compiler/bin/../lib/gcc/arm-none-eabi/5.2.1/../../../../arm-none-eabi/lib/armv7e-m/softfp/fpv5-sp-d16\libc.a(lib_a-exit.o): In function `exit':
    exit.c:(.text.exit+0x16): undefined reference to `_exit'
    c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.7.0.201602121829/tools/compiler/bin/../lib/gcc/arm-none-eabi/5.2.1/../../../../arm-none-eabi/lib/armv7e-m/softfp/fpv5-sp-d16\libc.a(lib_a-sbrkr.o): In function `_sbrk_r':
    sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk'
    collect2.exe: error: ld returned 1 exit status
    make: *** UDP_coupler.elf Error 1


    Can you help me please?


    Thanks

    Reads: 14379
    Posted by tarek bouchkati on 2016-06-16 11:08 Tunisia

    Hello David,

    You need either to add syscall.c to your project or add "-specs=nosys.specs" to (Project -> Properties -> C/C++ Build -> Settings -> MCU GCC Linker -> Linker flags)

    Regards,
    Tarek

         Posted by electr0dave on 2016-06-16 12:53

    Have I answered in a wrong location?

    Maybe I should write here...



         Posted by electr0dave on 2016-06-16 11:28

    I cannot program the stm...

    It is a little frustrating, because all worked fine until I made a simple change on the configurator...

    😕

    Capturar.PNG (18.99 Kb)

    Posted by tarek bouchkati on 2016-06-16 13:28 Tunisia

    It seems that your application is not located within FLASH (AXI).
    Are intentionally linking into TCM FLASH ??
    If not could you attach the linker file (*.ld)

    Posted by tarek bouchkati on 2016-06-16 14:12 Tunisia

    yes, your linker is not modified. but the error message indicates that you have data at address 0 & 26964.
    This address range is not located within flash which explains the warning "no flash bank found for address 0 / 26946".
    to verify could you please attach the map file (~/Debug/output.map)

    maybe you are not pointing to this linker, check (Project > Properties > C/C++ Build > Settings > MCU GCC Linker > General > Linker flags > Linker Script (-T) )

         Posted by electr0dave on 2016-06-16 15:21

    Thank you for your patience.

    In annex I put the *.map file.

    ;)

    Now I've changed the linker to "STM32F746ZGTx_FLASH.ld" and works fine!

    But I do not understand why this change... why, in a momment works nice, and the next momment all of this goes crazy...

    output.rar (55.40 Kb)
    Posted by tarek bouchkati on 2016-06-16 15:36 Tunisia

    Please find my comments with green

    Thank you for your patience.

    In annex I put the *.map file.
    this map file is obtained after you have fixed the project
    ;)

    Now I've changed the linker to "STM32F746ZGTx_FLASH.ld" and works fine!
    Glad to hear that

    But I do not understand why this change... why, in a momment works nice, and the next momment all of this goes crazy...
    You probably have intentionally discarded the linker settings so the arm_none_eabi_ld have used the default setting (flash at address 0)

         Posted by electr0dave on 2016-06-16 16:10

    OK.

    For now all works fine... thanks to your help.

    Thank you for your time.

    😀

    Regards,
    David


     
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