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IAR Linker Problem

Discussion in 'Embedded' started by Oliver, Jan 7, 2004.

  1. Oliver

    Oliver Guest


    I'm using an IAR Compiler for Hitachi H8-3687. This Controller has to RAM
    areas (0xE800-0xEFFF(2kByte) and 0xFB80-0xFF7F(1kByte). My segment UDATA1
    has more than 2kByte an is not linkable. How can I split the segment in two
    parts to locate it in both RAM areas?

    Oliver, Jan 7, 2004
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  2. Oliver

    Dave Hansen Guest

    I've not used that compiler, but a couple of general principles:

    1) Initialized and Uninitialized data usually go into two separate
    segments. A first guess would be IDATA1. Try initializing some data
    to see if it moves. Tell your linker script to put IDATA1 in one RAM
    area and UDATA1 in the other.

    2) The compiler usually decides where to put data. There may be an
    option or a pragma you can use when compiling to direct some modules
    to place data in one or another segment of your own choosing. Maybe
    UDATA2? Look for something like that.


    Dave Hansen, Jan 7, 2004
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  3. I have not used the H8-3 IAR compiler, but on the IAR compilers I have
    used theres is a compiler flag that keeps text/string data in the ROM
    areas. Make sure this is enabled otherwise all text/string data is
    copied to RAM.
    For locating some variables in other data areas you need to use
    something like the following:
    #pragma memory=dataseg(anothersection)
    int var_in_anothersection;
    #pragma memory=default
    You can specify in the linker file where "anothersection" should be

    Anton Erasmus
    Anton Erasmus, Jan 7, 2004
  4. Oliver

    jtp Guest

    If none of your projects translation units e.g. .c files consists more
    2 kBytes uninitialized data, then the linker should be able to place
    uninitialilzed data to those two RAM areas automatically.
    But if one of these translation units have more than 2 kBytes
    uninitialized data
    then you better do what Dave said in his post.
    jtp, Jan 8, 2004
  5. Oliver

    Oliver Hager Guest


    Thanks, it's working now!!!!!!


    Oliver Hager, Jan 9, 2004
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