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Linker 4.9.3 is generating WRONG Offset Address within MAP file

Pashan None
Genius 5660 points


Hello Support,

I am attaching a ZIP file. Please unzip all files to a folder.

Once you modify the Linker_Offset_Bug.bat file to your Linker Location Path and run it, you will get Flash_Hex_Array.map file.

In the MAP file you will find following symbols and address respectively:

08000000   _Flash_Driver_Download_P

0000048f   FLASH_ERASE_SECTOR_OFFSET
00000594   FLASH_SET_BANK_OFFSET

08000595   Fapi_setActiveFlashBank
0800048f   Erase_Flash_Sector_From_Bank

The address value of FLASH_SET_BANK_OFFSET is wrong because in the linker_Flash_Drv_Bug.cmd file you will see the following statements:

                         FLASH_SET_BANK_OFFSET = (Fapi_setActiveFlashBank - _Flash_Driver_Download_P);  /* ???? -- This is BUG */

                         FLASH_ERASE_SECTOR_OFFSET = (Erase_Flash_Sector_From_Bank - _Flash_Driver_Download_P);

Please let me know about this BUG.

Thank you.

Regards

Pashan

 

 

Linker_Offset_Bug.zip
  • 0
    TI__Guru**** 251950 points

    Interesting that the linker gets it wrong by only 1.  I wish I could say that's close enough.  :-)

    You have written an expression which uses two symbols that are being defined, effectively, at the same time as when the expression is being evaluated.  Both Fapi_setActiveFlashBank (a function symbol) and _Flash_Driver_Download_P (created on an earlier line in the link command file) are not well defined when the linker starts.  You obviously intend for that expression to be evaluated after those symbols have been defined.  However, the linker does not work like that, and there is no method by which you can change it.

    The only solution I see is to evaluate that expression after linking is complete.  This means it must be done dynamically, when your system is running.  I realize this is not what you expect.  But it is the only solution I can see right now.

    Thanks and regards,

    -George

     

  • 0 in reply to George Mock
    Genius 5660 points

    Hello George,

    I only want to create a SYMBOL in the MAP file which determines the OFFSET of some other SYMBOLS as present within OBJ files from the RUN ADRRESS or LOAD ADDRESS.

    Is there any better way to create the OFFSET value of any symbol?

    Please help,

    Thank you.

    Regards

    Pashan

     

  • 0 in reply to Pashan None
    TI__Guru**** 251950 points

    Pashan None said:
    Is there any better way to create the OFFSET value of any symbol?

    Unfortunately, no.  Computing an offset requires subtraction of two symbols. And those symbols are being defined during the link.  The linker simply does not support that.

    Thanks and regards,

    -George