TMS320F280049: Asking for best practice to jump between secondary boot loader and app

Sheldon He

Hi expert,

Engineer usually put one image on flash entry point sector as an secondary boot loader and another image in some other flash sector as app part. In this practice, they need to switch between the two parts by loading differnt values in PC register. If we jump with some assembly code:

1. Will it be necessary to reset all the CPU registers? If not, what should we do?

2. Will it be necessary to put code start branch at the front of each image and jump to the begining of code start branch to initialize RAM?

3. What else would you recommend us to do here?

BTW, Any application note regarding this to share with us?

Thanks

Sheldon

over 6 years ago

0 Christopher Chiarella over 6 years ago

TI__Mastermind 30255 points

Sheldon

Jumping to another location, you use ((void (*)(void))EntryAddr)(); (and/or copy that does in terms of assembly).

You could also use something like: asm(" LB 0x9EFF0");

When jumping to each app, you should be jumping to the codestart location so that the c_init00 of the RTS library is run before main().

Best regards

Chris

0 Sheldon He over 6 years ago in reply to Christopher Chiarella

TI__Expert 8585 points

Hi Chris,

I have one remaining question for you. Since the secondary bootloader and user application are coming from two separate CCS project, will the PC jump need to take care of below point?

1. Will it be necessary to reset all the CPU registers? If not, what should we do?

Thanks

Sheldon

0 Christopher Chiarella over 6 years ago in reply to Sheldon He

TI__Mastermind 30255 points

Sheldon

No, that shouldn't be necessary. Following what I mentioned should be sufficient.

Best regards

Chris

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TMS320F280049: Asking for best practice to jump between secondary boot loader and app