[ABANDONED] RAM Memory Segment Program Section size ignored?

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  • [ABANDONED] RAM Memory Segment Program Section size ignored?

    Hi, first time posting here.

    I have reserved a section in my RAM memory segment called 'my_non_init' (as highlighted in the screenshot attached) and gave it a size of 0x1000.
    1. A size of 0x1000 stands for 4096 bytes, right?
    2. Since I have reserved 4096 bytes (4kB) but the Memory View shows 24.1kB, why don't I get a compilation error?
    It is essential for me to know the amount of bytes needed/reserved to be able to block the same amount of non initialized memory in the bootloader.

    Thanks!
    Images

    • Untitled.png

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  • Hi,

    in Embedded Studio V5 the size attribute defined the minimum size of a section.
    If you would have placed less than 0x1000 bytes into this section, it would have been expanded.

    See line 6 of the generated linker script:

    Source Code

    1. __my_non_init_load_start__ = ALIGN(__non_init_end__ , 4);
    2. .my_non_init ALIGN(__non_init_end__ , 4) (NOLOAD) : AT(ALIGN(__non_init_end__ , 4))
    3. {
    4. __my_non_init_start__ = .;
    5. *(.my_non_init .my_non_init.*)
    6. . = ALIGN(MAX(__my_non_init_start__ + 0x1000 , .), 4);
    7. }
    8. __my_non_init_end__ = __my_non_init_start__ + SIZEOF(.my_non_init);
    9. __my_non_init_size__ = SIZEOF(.my_non_init);
    10. __my_non_init_load_end__ = __my_non_init_end__;
    13. . = ASSERT(__my_non_init_start__ == __my_non_init_end__ || (__my_non_init_end__ - __RAM1_segment_start__) <= __RAM1_segment_size__ , "error: .my_non_init is too large to fit in RAM1 memory segment");
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    Embedded Studio V6.32 adds an additional assert to also make the attribute the maximum size of a section:

    Source Code

    1. . = ASSERT(__my_non_init_size__ <= 0x1000 , "error: .my_non_init is larger than specified size");
    If that is the behavior you would expect, you could upgrade to the latest version of Embedded Studio, or change your project to use a custom linker script which includes the additional assert.

    - Johannes
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