F2812 Flash burn on a 3P demo board

Test2347

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.

over 17 years ago

David M. Alter over 17 years ago

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

Liu XiaoChuan over 14 years ago 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

David M. Alter over 14 years ago 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

Liu XiaoChuan over 14 years ago 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