TMS570LS1227: Branch instruction for TMS570LS1227

Hi Lokesh,

I use following ways to branch code execution to new location for example 0x20000

1) asm(" mov r12, 0x20000");

     asm(" blx r12");

2)  C code:

  ((void (*)(void))0x20000)();  

Both should work without any issue. Does your code cause reset? 

case 1 :

asm(" mov r12, 0x20000");

     asm(" blx r12"); 

After flashing the hex file, application hex file written is validated and then Appflag is made ON ,

Reset occurs, checks for Appflag i.e. validates app file and then jumps routine is called where  

asm(" mov r12, 0x20000");

     asm(" blx r12"); 

 is called 

It jumps to the 0x00020000 address (observed in disassembly listing) . executes few instructions and when put in continuous RUN ; instead of executing the application code , reset occurs and then bootloader executes again .

Again goes to check for Appflag i.e. validates app file and then jumps routine   . Stays in Bootloader only.

2   ((void (*)(void))0x20000)();   is not working at all 

After flashing the hex file, application hex file written is validated and then Appflag is made ON ,

Reset occurs, checks for Appflag i.e. validates app file and then jumps routine is called where   ((void (*)(void))0x20000)();  is called 

but it doen't work . Stays in Bootloader only.

any update?

Is your application located at 0x20000?

yes

Does your bootloader accept HEX format data and program hex data to flash? My bootloader example only supports raw binary file format.

Its the Intel Hex file format

any other  changes to be done like in interrupt vector table ?

It looks like the instructions at 0x200000 are not correct. If the application is programmed to flash starting at x0200000, the instructions at 0x200000 are:

EA00xxxx      --> jump to _c_int00()

EAFFFFFE    --> undefEntry

EAFFFFFE    -->svcEntry

EAFFFFFE    -->prefetchEntry

EAFFFFFE    -->dataEntry

... ...

Hi Lokesh,

Can you use my bootloader example to load the application in binary format? 

You can use CCS to generate binary file:

Type this command:

"${CCE_INSTALL_ROOT}/utils/tiobj2bin/tiobj2bin" "${BuildArtifactFileName}" "${BuildArtifactFileBaseName}.bin" "${CG_TOOL_ROOT}/bin/armofd" "${CG_TOOL_ROOT}/bin/armhex" "${CCE_INSTALL_ROOT}/utils/tiobj2bin/mkhex4bin"

to

Build-->Steps --> Post-Build Steps:

The Flash Tool I designed uses Hex file format as Input.

Hi QJ Wang, Can't we use hex file for the same microcontroller family ?

Hi Lokesh,

Yes, you can use hex file. Can you please check the instructions at 0x200000?

Hi QJ Wang,

Before this i have one issue. Please go through the word file i have attached. 03052022.docx

What should be the changes made in cmd file and intvecs.asm files

In Application cmd file if the above address are used, the application doest not run, when it is exected standalone without bootloader.

The code at 0x200000 won't execute without bootloader. 

The ARM Cortex-R4F processor core starts execution from the reset vector address of 0x00000000 whenever the core gets reset. 

Hi QJ Wang,

Ok agree with you.

Now i have attached one PDF file where I have written all the observations and the issues faced.

Please go through the cmd and sys_intvecs.asm file contents for both bootloader and Application files.

The instructions at 0x20000 location also I have attached with the same.

Let me know where i am going wrong.04052022.pdf

Hi QJ Wang, any update please ?

It stays in prefetch entry

Hey QJ Wang any updates ? 

Hi Lockesh,

The first function call in _c_int00_() is: _coreInitStackPointer_();

Can you step into this function to check which instruction causes the prefetch abort?