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F2812 Flash burn on a 3P demo board

Test2347
Prodigy 120 points

A customer is trying to follow the application note SPRA958 "Running an Application from Internal Flash Memory on the TMS320F28xxx DSP" on a Wintech board TDS2812ZX.  After the OUT file is generated, he use the "On-Chip Flash Programmer" plug-in of CCS to try to burn the demo code into the board.  He uses the DSP/BIOS version of the demo code.

 In the last step of burning, he got a warning "Warning: This program contains initialized RAM data. It may run successfully under Code Composer Studio but not as a standalone system because of this. If your Flash program requires initialized data in RAM, you will need to write Flash code to initialize RAM memory."  Then of course, his code cannot run after flash onto the demo board.

But if he use the non-DSP/BIOS version of the demo code, then it can burn and run successfully on the board.

Could some one tell me what is this warning all about?  The warning does not show which address is incorrect, so it is very hard to find out which BIOS section is located incorrectly.

 

  • TI__Guru 61235 points

    Henry,

    I can guarantee you that there is nothing wrong with any of the code in SPRA958.

    The warning you cite is almost always given by the CCS C2000 flash programming plugin.  It is finding initialized sections that are being linked to run from RAM.  For example, the flash initialization routine is loaded to flash but run from RAM.  This is handled in the linker command file.  The user code must copy the function (section) from flash to RAM at startup.  The plugin does not know if the user has done this or not, so it issues the warning.  Personally, I have never liked this warning since it confuses the customer (which is exactly what has happened here).

    Did your customer actually try to run the BIOS example from SPRA958 (i.e., ignor the warning and run anyway)?  It does work.  I know, because I wrote it.

    Regards,

    David

  • in reply to David M. Alter
    Prodigy 50 points

    David:

           I meet the same question with Henry, I use the SPRA958h program in CCS 3.3 to test a program running program in 2812 Flash. I cann't test it in CCS4.2 because of simulator, and I cann't search  the newest SPRA958i program in www.ti.com. Please help me or give me a good CCS 3.3 version program example using DSP BIOS to run in flash.Thansks. My email:scqxlxc@sina.com

  • in reply to Liu XiaoChuan
    TI__Guru 61235 points

    Hello Liu,

    As was said previously in the post, the warning message you are seeing from the flash programmer is normal and expected.  Code that is properly configured to run from flash on the C2000 will also have some code that loads to flash but runs from RAM.  That is what causes the warning.  The user code must perform the copy of this code from flash to RAM before those parts of the code are executed.  The code in appnote SPRA958 does this copy.  I guarantee you there is nothing wrong with the SPRA958 code, both BIOS and non-BIOS.  If the code is not running correctly, then something else is wrong in your system.  You will need to debug it.

    >>  I cann't search  the newest SPRA958i program in www.ti.com.

    Try searching for just SPRA958 (no revision letter).  The latest version is 'J'.  But, the CCSv3.3 examples have been dropped starting from this version.  CCSv3.3 is two years old now, and has long since been replaced by CCSv4.

    I see you also made a new thread on this same subject, http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/t/124191.aspx.  I am going to mark that one answered with a reference to this thread.

    Regards,

    David

  • in reply to David M. Alter
    Prodigy 50 points

    David: Thanks for your reply . I Cann't use the CCSV4 because of the question of my emulator version. Can you mail me SPRA958 which version is 'I' ASAP, I need test it again as your said. My project delay three weeks because of the quesion.Please mail it to scqxlxc@sina.com.

    Regards

     

  • in reply to Liu XiaoChuan
    TI__Guru 61235 points

    Liu,

    I have sent you the files.

    Regards,

    David

  • in reply to Liu XiaoChuan
    Prodigy 50 points

    David:

             Thanks for your mail, My question is solved. The SPRA958 demo program is ok, I make a mistake in defining data section.

           Regards

          Liu

  • in reply to David M. Alter
    Prodigy 20 points

    Hi..David.I need spra958 for CCS 3.3,Can you send spra958 to me?

    my mail: leo_jau@hotmail.com.tw

    thanks.....

  • in reply to Jian Li Jau
    TI__Guru 61235 points


    Jian,

    I have attached the 'i' revision of SPRA958 to this post.  This was the last version supporting CCSv3.3.

    Regards,

    David

    spra958i.zip