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Differences between legacy coff and EABI ELF regarding code size

Edriano De Araujo
Intellectual 510 points
Other Parts Discussed in Thread: CODECOMPOSER, MSP430F6638

Differences between legacy coff and EABI ELF regarding code size
i am testing my project using both legacy coff end EABI whe using coff i get 11KBytes of code and when using EABI my code is 16KBytes of code. all using extended data and code.

Does anyone got anything like this?
thank you in advance

  • 0
    TI__Guru* 84225 points

    What ISA are you using?  ARM, C6000, or MSP?

    Do you have a lot of uninitialized global variables?

  • 0 in reply to Archaeologist
    Intellectual 510 points

    thank you for your answer.

    Yes i forgot to mention, i am using MSP430 6638. 

    yes i have many uninitialized global variables.

  • 0 in reply to Edriano De Araujo
    TI__Guru* 84225 points

    Could you please post the linker command files for the COFF and the EABI versions?

  • 0 in reply to Archaeologist
    Intellectual 510 points

    Hi. I am using the same command file in both cases. and i have attached a file where you can see that

    when i choose the EABI the code composer 16K limit is gone. what does not happen when using the legacy coff

    i have just bought a codecomposer from TI Webstore and i am waiting for the license.

    /******************************************************************************/

    /* lnk_msp430f6638.cmd - LINKER COMMAND FILE FOR LINKING MSP430F6638 PROGRAMS */
    /* */
    /* Usage: lnk430 <obj files...> -o <out file> -m <map file> lnk.cmd */
    /* cl430 <src files...> -z -o <out file> -m <map file> lnk.cmd */
    /* */
    /*----------------------------------------------------------------------------*/
    /* These linker options are for command line linking only. For IDE linking, */
    /* you should set your linker options in Project Properties */
    /* -c LINK USING C CONVENTIONS */
    /* -stack 0x0100 SOFTWARE STACK SIZE */
    /* -heap 0x0100 HEAP AREA SIZE */
    /* */
    /*----------------------------------------------------------------------------*/


    /****************************************************************************/
    /* SPECIFY THE SYSTEM MEMORY MAP */
    /****************************************************************************/

    MEMORY
    {
    SFR : origin = 0x0000, length = 0x0010
    PERIPHERALS_8BIT : origin = 0x0010, length = 0x00F0
    PERIPHERALS_16BIT : origin = 0x0100, length = 0x0100
    RAM : origin = 0x2400, length = 0x4000
    INFOA : origin = 0x1980, length = 0x0080
    INFOB : origin = 0x1900, length = 0x0080
    INFOC : origin = 0x1880, length = 0x0080
    INFOD : origin = 0x1800, length = 0x0080
    FLASH : origin = 0x8200, length = 0x7D80
    FLASH2 : origin = 0x10000,length = 0x38000
    INT00 : origin = 0xFF80, length = 0x0002
    INT01 : origin = 0xFF82, length = 0x0002
    INT02 : origin = 0xFF84, length = 0x0002
    INT03 : origin = 0xFF86, length = 0x0002
    INT04 : origin = 0xFF88, length = 0x0002
    INT05 : origin = 0xFF8A, length = 0x0002
    INT06 : origin = 0xFF8C, length = 0x0002
    INT07 : origin = 0xFF8E, length = 0x0002
    INT08 : origin = 0xFF90, length = 0x0002
    INT09 : origin = 0xFF92, length = 0x0002
    INT10 : origin = 0xFF94, length = 0x0002
    INT11 : origin = 0xFF96, length = 0x0002
    INT12 : origin = 0xFF98, length = 0x0002
    INT13 : origin = 0xFF9A, length = 0x0002
    INT14 : origin = 0xFF9C, length = 0x0002
    INT15 : origin = 0xFF9E, length = 0x0002
    INT16 : origin = 0xFFA0, length = 0x0002
    INT17 : origin = 0xFFA2, length = 0x0002
    INT18 : origin = 0xFFA4, length = 0x0002
    INT19 : origin = 0xFFA6, length = 0x0002
    INT20 : origin = 0xFFA8, length = 0x0002
    INT21 : origin = 0xFFAA, length = 0x0002
    INT22 : origin = 0xFFAC, length = 0x0002
    INT23 : origin = 0xFFAE, length = 0x0002
    INT24 : origin = 0xFFB0, length = 0x0002
    INT25 : origin = 0xFFB2, length = 0x0002
    INT26 : origin = 0xFFB4, length = 0x0002
    INT27 : origin = 0xFFB6, length = 0x0002
    INT28 : origin = 0xFFB8, length = 0x0002
    INT29 : origin = 0xFFBA, length = 0x0002
    INT30 : origin = 0xFFBC, length = 0x0002
    INT31 : origin = 0xFFBE, length = 0x0002
    INT32 : origin = 0xFFC0, length = 0x0002
    INT33 : origin = 0xFFC2, length = 0x0002
    INT34 : origin = 0xFFC4, length = 0x0002
    INT35 : origin = 0xFFC6, length = 0x0002
    INT36 : origin = 0xFFC8, length = 0x0002
    INT37 : origin = 0xFFCA, length = 0x0002
    INT38 : origin = 0xFFCC, length = 0x0002
    INT39 : origin = 0xFFCE, length = 0x0002
    INT40 : origin = 0xFFD0, length = 0x0002
    INT41 : origin = 0xFFD2, length = 0x0002
    INT42 : origin = 0xFFD4, length = 0x0002
    INT43 : origin = 0xFFD6, length = 0x0002
    INT44 : origin = 0xFFD8, length = 0x0002
    INT45 : origin = 0xFFDA, length = 0x0002
    INT46 : origin = 0xFFDC, length = 0x0002
    INT47 : origin = 0xFFDE, length = 0x0002
    INT48 : origin = 0xFFE0, length = 0x0002
    INT49 : origin = 0xFFE2, length = 0x0002
    INT50 : origin = 0xFFE4, length = 0x0002
    INT51 : origin = 0xFFE6, length = 0x0002
    INT52 : origin = 0xFFE8, length = 0x0002
    INT53 : origin = 0xFFEA, length = 0x0002
    INT54 : origin = 0xFFEC, length = 0x0002
    INT55 : origin = 0xFFEE, length = 0x0002
    INT56 : origin = 0xFFF0, length = 0x0002
    INT57 : origin = 0xFFF2, length = 0x0002
    INT58 : origin = 0xFFF4, length = 0x0002
    INT59 : origin = 0xFFF6, length = 0x0002
    INT60 : origin = 0xFFF8, length = 0x0002
    INT61 : origin = 0xFFFA, length = 0x0002
    INT62 : origin = 0xFFFC, length = 0x0002
    RESET : origin = 0xFFFE, length = 0x0002
    }

    /****************************************************************************/
    /* SPECIFY THE SECTIONS ALLOCATION INTO MEMORY */
    /****************************************************************************/

    SECTIONS
    {
    .bss : {} > RAM /* GLOBAL & STATIC VARS */
    .sysmem : {} > RAM /* DYNAMIC MEMORY ALLOCATION AREA */
    .stack : {} > RAM (HIGH) /* SOFTWARE SYSTEM STACK */

    .text : {}> FLASH /* | FLASH2 CODE */
    .text:_isr : {} > FLASH /* ISR CODE SPACE */
    .cinit : {} > FLASH /* INITIALIZATION TABLES */
    //#ifdef (__LARGE_DATA_MODEL__)
    .const : {} > FLASH /*| FLASH2 CONSTANT DATA */
    //#else
    // .const : {} > FLASH /* CONSTANT DATA */
    //#endif
    .cio : {} > RAM /* C I/O BUFFER */

    .pinit : {} > FLASH /* C++ CONSTRUCTOR TABLES */

    .infoA : {} > INFOA /* MSP430 INFO FLASH MEMORY SEGMENTS */
    .infoB : {} > INFOB
    .infoC : {} > INFOC
    .infoD : {} > INFOD

    .int00 : {} > INT00 /* MSP430 INTERRUPT VECTORS */
    .int01 : {} > INT01
    .int02 : {} > INT02
    .int03 : {} > INT03
    .int04 : {} > INT04
    .int05 : {} > INT05
    .int06 : {} > INT06
    .int07 : {} > INT07
    .int08 : {} > INT08
    .int09 : {} > INT09
    .int10 : {} > INT10
    .int11 : {} > INT11
    .int12 : {} > INT12
    .int13 : {} > INT13
    .int14 : {} > INT14
    .int15 : {} > INT15
    .int16 : {} > INT16
    .int17 : {} > INT17
    .int18 : {} > INT18
    .int19 : {} > INT19
    .int20 : {} > INT20
    .int21 : {} > INT21
    .int22 : {} > INT22
    .int23 : {} > INT23
    .int24 : {} > INT24
    .int25 : {} > INT25
    .int26 : {} > INT26
    .int27 : {} > INT27
    .int28 : {} > INT28
    .int29 : {} > INT29
    .int30 : {} > INT30
    .int31 : {} > INT31
    .int32 : {} > INT32
    .int33 : {} > INT33
    .int34 : {} > INT34
    .int35 : {} > INT35
    .int36 : {} > INT36
    .int37 : {} > INT37
    .int38 : {} > INT38
    .int39 : {} > INT39
    .int40 : {} > INT40
    .int41 : {} > INT41
    .int42 : {} > INT42
    .int43 : {} > INT43
    .int44 : {} > INT44
    .int45 : {} > INT45
    .int46 : {} > INT46
    .int47 : {} > INT47
    .int48 : {} > INT48
    .int49 : {} > INT49
    .int50 : {} > INT50
    .int51 : {} > INT51
    .int52 : {} > INT52
    .int53 : {} > INT53
    .int54 : {} > INT54
    .int55 : {} > INT55
    .int56 : {} > INT56
    .int57 : {} > INT57
    .int58 : {} > INT58
    .int59 : {} > INT59
    .int60 : {} > INT60
    .int61 : {} > INT61
    .int62 : {} > INT62
    .reset : {} > RESET /* MSP430 RESET VECTOR */
    }

    /****************************************************************************/
    /* INCLUDE PERIPHERALS MEMORY MAP */
    /****************************************************************************/

    -l msp430f6638.cmd

  • 0 in reply to Archaeologist
    TI__Guru* 84225 points

    I'm very sorry, I meant to ask if you could post the linker *map* files

  • 0 in reply to Archaeologist
    Intellectual 510 points

    Here is both .map files generated.

    thanks in advance.

    Debug.rar
  • 0 in reply to Edriano De Araujo
    TI__Guru* 84225 points

    The major difference in code size is due to the fact that for EABI, the type "double" is a 64-bit type.  The library routines which support things like 64-bit double-precision division and multiplication are not as optimized for code size as the 32-bit single-precision float routines were; in fact they are much larger.  You can recover this lost performance by using "float" instead of "double" and making sure to suffix your float constants with "f".

  • 0 in reply to Archaeologist
    Intellectual 510 points

    Hi, thanks for the answer.

    Could you point me in the right direction to find the location where this informations are.

    I have searched Ti web sit and was not able to find.

    I have found http://www.ti.com/lit/ug/slau132e/slau132e.pdf that states the double size as 32bits and no 64. for this project i am using many double variables as time is no critical when doing the math. and change everything to float will cost some time debugging.

    i would like to know better the differences between rts430xl.lib and rts430x_lc_ld_eabi.lib.

    regards