CCS/TMS320F28335: CMD file modification of application project in IAP application

Vincent,

You cannot change BEGIN address. Reason: Once the boot rom realizes it has to boot to flash it automatically jumps to 0x33FFF6.

On a boot to flash mode, If you store entry point address of secondary boot, you would automatically jump to secondary boot code on each power up. But, storing entry point address of secondary boot doesn't have restriction on you storing application in section A. Memory locations 0x338000 - 0x33FF7F can still be used to store code / data sections of application code.

Here is my understanding of your requirement: When you boot to flash, you enter secondary boot code and check whether you want to update your application code based on external stimulus (like say based on GPIO state (or) reading a specific word to change application code).

• If external stimulus doesn't demand application code change, you just jump to application code.
• If external stimulus demands application code change, you want to erase the application code (either partially (or) fully) and re-program with new application code.

Am i correct?

If so, please threads should be helpful

Regards,

Manoj

Hi Manoj,

Sorry for reply later.

Yes, your understanding of my requirements is correct.

But I am not very clearly how to change the cmd file of application , on the other words, which points should be modified in cmd file of application project.

Here is my understanding for application cmd file  modification :(application area = Flash_F to Flash_D ， secondary_boot area = Flash_H to Flash_G)

1. BEGIN  :0x33FFF6 --- you said this address should be not changed.  Here is where i tried to change to 0x327FFE(application entry point) before.

2. .cinit / .pinit / .text            : > FLASHF_D             ---  place application code into Flash_F to Flash_D.

3.  ramfuncs            : LOAD = FLASHC,                 ---  place ramfuncs code into Flash_C,  including flash_api code

4. .econst / .switch   : > FLASHF_D      PAGE = 0  --- place const code into Flash_F to Flash_D

5. IQmath              : > FLASHC      PAGE = 0         --- place math code into Flash_C

About these content in cmd file of secondary_boot , i think it just need modify .cinit/.pinit/.text/.econst/.switch  area to Flash_H to Flash_G only, right?

I also add a sentence which jump from secondary_boot to application:

=========================================================

for(;;)
{
//
// This loop will be interrupted, so the overall
// delay between pin toggles will be longer.
//
//DELAY_US(DELAY);
LoopCount++;
//GpioDataRegs.GPBTOGGLE.bit.GPIO32 = 1;
LedLoop();

if(LoopCount == 10)
{
asm ("LB 0x327FFE");                         // jump to application
}
}

==========================================

I think after executed asm ("LB 0x327FFE"); , it will enter application project to execute application.And the BEGIN address i tried to modify is application BEGIN address,not secondary_boot. I think how to modify BEGIN address of application project is my key point.

I tried as above and program app and secondary_boot into flash via debug tool XDS100.

1)  Program app first , then program secondary_boot,  power off then power on again, it will run secondary_boot automatically.

2)  My expect is after program app and secondary_boot,  address 0x33FFF6 = entry point of secondary_boot, and address 0x327FFE = entry point of app.

     But currently address 0x327FFE = 0xffff, so i think cmd file modification of application is wrong.

That's why i thought if i should modify BEGIN value of application.

My purpose is:

a. Program application code into flash(app code area) via debug tool XDS100 first, because currently there is no related PC upgrade tool yet to send hex file.

   So use debug tool to program application code into flash is a method.

b. Then debug secondary_boot project into flash via debug tool XDS100, run it to jump to application.

c. Run continue, it will start run application code.

I thought this method could be executed to verify secondary_boot jump to application correctly or not.

I do not know if i describe my question clearly or not.  

Hope your response.

Thanks.

Best Regards,

Vincent

Vincent,

If you want to execute Secondary boot of device power up, place the entry point address of secondary boot in 0x33FFF6. In your Secondary boot code, when you decide to jump to application project, just jump to the start address of your application project (Note: This should have a valid opcode). You don't need to enter the entry point address of application code in cmd file.

Regards,
Manoj

Hi Manoj,

I am doubted what you said "just jump to the start address of my application project".

As this URL reference : https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/273790    I thought secondary_boot should jump to the entry point of application.

And about this entry point, as my understanding , it should be the last two address of the whole application area.

For example of my application, the flash area = Flash_F to Flash_D, so secondary_boot should jump to address 0x327FFE.

So let me summarize my problem.

1. When secondary_boot jump to application , does it only use asm (" LB 0x327FFE "); ?  

2. Since application area = Flash_F to Flash_D, jump address is 0x327FFE, right ? (i did test to jump to 0x310000H, the start address of application, but failed, it enter abort. of exit.c)

3. If 1. and 2. are right, how to change cmd file of application project ? 

   1) BEGIN address = 0x33FFF6, it should not be changed, right?

   2) other area you can see above information in the cmd file content at the begging of this topic I showed.

         .init / .pinit / .text   :  >   FLASHF_D , PAGE = 0       // here should be the application flash area, and the begging of application should be the start of FlashF:0x310000H, 

Today I did test both jump to 0x327FFEH and 0x310000H, both failed.

1)  when jump to 0x310000H (this address has valid data,not 0xFFFF) , it enter abort() of exit.c.

2)  When jump to 0x327FFEH (this address data : FFFF FFFF 1901 56C3 FFFF 0006) , it enter ILLEGAL_ISR(), not run application code never.

BTW, before jump to application in secondary_boot,  i disable CPU interrupts and clear all CPU interrupt flags:

IER = 0x0000;
IFR = 0x0000;

So hope your response ASAP.

Thanks.

Best Regards,

Vincent

     

Vincent,

When I mean start address of your application, I mean the entry point address of application project. This entry address should contain the first op-code which you would like to get executed in application code. It may not necessarily be first / last address of application flash sector.

What is entry point address really depends upon the first opcode (of application code) you want to get executed when you jump from secondary bootloader.

Regards,
Manoj

Hi Manoj,

Thanks for your response.

Would you mind give me an example , such as my application which described in above information.

BTW: would you mind answer my questions I asked in May.3rd ? 

It's urgent for me to do test on this jumpping from secondar_boot to application.  Otherwise I have to consider another design.

Thanks for your understanding.

Best Regards,

Vincent

Vincent,

Please highlight me the question which you didn't get clarification. I felt I addressed your question in general.

I will see whether I have any example code. But, I'm not positive.

Regards,
Manoj

Hi Manoj,

Please see below highlight in red.

1. When secondary_boot jump to application , does it only use asm (" LB 0x327FFE "); ?

2. Since application area = Flash_F to Flash_D, jump address is 0x327FFE, right ? (i did test to jump to 0x310000H, the start address of application, but failed, it enter abort. of exit.c)

3. If 1. and 2. are right, how to change cmd file of application project ?

1) BEGIN address = 0x33FFF6, it should not be changed, right?

2) other area you can see above information in the cmd file content at the begging of this topic I showed.

.init / .pinit / .text : > FLASHF_D , PAGE = 0 // here should be the application flash area, and the begging of application should be the start of FlashF:0x310000H,

Today I did test both jump to 0x327FFEH and 0x310000H, both failed.

1) when jump to 0x310000H (this address has valid data,not 0xFFFF) , it enter abort() of exit.c.

2) When jump to 0x327FFEH (this address data : FFFF FFFF 1901 56C3 FFFF 0006) , it enter ILLEGAL_ISR(), not run application code never.

BTW, before jump to application in secondary_boot, i disable CPU interrupts and clear all CPU interrupt flags:

IER = 0x0000;
IFR = 0x0000;

So hope your response ASAP.

Thanks.

Best Regards,

Vincent

Vincent,

Unfortunately, I don't have an example code which I could share it.

1) This depends upon how you have written your application code. That is reason why in my previous message I said this jump address should be first opcode you want to execute in application code. So, I can't say that asm("LB 0x327FFE") is what you need to use.

2) Same answer as above

3) You don't need to change application project cmd file. When you load the application project independently without secondary bootloader code. What is the first op-code that get executed. The op-code of the first address is address you need to jump to from your secondary bootloader program.

4) According to your application code, addresses 0x327FFEH and 0x310000H might not be have the first op-code in your application that needs to be executed.

Can you send me your application project ? You either privately message me if you need to.

Hi Manoj,

Thanks.  Ok, we continue to discuss in this topic.

I can send my project to you without key C files, hope you could understand it.  And i think maybe you do not need my c files, only need project setting related files, right ?

Or whether you only need cmd files?  

Could you give me your mail box?

Thanks.

Best Regards,

Vincent

Please send me a private message. I shall reply my email address on that private mesage. I can't post my email address here.

I definetely need your CMD file. Its okay if you don't send me your key C files.

Vincent,

Please resend to my email. But don't send it as .rar file.

Regards,
Manoj

Vincent,

I received 3 files shown below:-

F28335_Boot.txt
F28335_FLASH.txt
DSP2833x_Headers_nonBIOS.txt

After reviewing F28335_FLASH.txt (which looks like application code .cmd), it looks like you are assigning codestart section to BEGIN (0x33FFF6 - 0x33FFFF). You can't do that because this addresses are already programmed by F28335_Boot.txt. I would recommend you to make the following changes.

Memory section:
FLASHC : origin = 0x328000, length = 0x007FFD

FLASHC_BEGIN : origin = 0x32FFFE, length = 0x2

Sections section:

codestart :>  FLASHC_BEGIN

In your boot code, you have to use below statement to jump to your application code.

asm(" LB 0x32FFFE");

Regards,

Manoj

Can I close this thread? Is this issue resolved?