Compiler/TMS320F280049: Firmware update mechanism

Richard R

Tool/software: TI C/C++ Compiler

Hello,
I'd like to create app with integrated bootloader inside it.
Flash memory is divided into two parts - bank0 and bank1. App always uses only one part - newly uploaded app will be written to other part.
Start sequence :
After power up, program start at address 0x80000, at this address is stored "launcher" which launches app stored in bank0 or bank1. If there is app in both bank0 and bank1, "launcher" launches the newer version of the app.
Upload sequence:
Running app is stored in one bank (bank0 or bank1). If app is running from bank0, new app will be written during upload sequence to bank1 and vice versa.

For this functionality it is necessary to generate app which functionality is independent of its location in memory (bank0 or bank1) and only difference is in jump to app address. That means, if I compile app in bank0, I can put this app to bank1 and correctly launch it. I tried to compile same app in bank0 and bank1 and compare hex files. In files was lot of diferences.
Is for TMS320F28004x some solution to solve this functionality ?

over 5 years ago

0 Vamsi Gudivada over 5 years ago

TI__Guru* 87155 points

Richard,

Did you use the same compiler/optimization settings for both builds?

Did you check if the differences are the addresses?

I can assign this to our compiler team based on your reply.

Thanks and regards,

Vamsi

0 Richard R over 5 years ago in reply to Vamsi Gudivada

Prodigy 70 points

Vamsi,

Yes I use same configuration for both builds. I do not use any optimization

Yes, I compare hex files. Different was address jump to program (:020000040008F2 :020000040009F1) and in some places there were differences in the hex file.

Thanks for the quick reply.

0 Vamsi Gudivada over 5 years ago in reply to Richard R

TI__Guru* 87155 points

Richard,

I think the differences in the hex file are the addresses (as they differ between the banks).

Do you want me to assign this to our compiler team?

Thanks and regards,
Vamsi

0 Richard R over 5 years ago in reply to Vamsi Gudivada

Prodigy 70 points

Yes, I will be grateful for the advice.

0 Vamsi Gudivada over 5 years ago in reply to Richard R

TI__Guru* 87155 points

Richard,

They may ask you to provide the executable (out) files, linker cmd files etc.

I am assigning this to our compiler team.

Thanks and regards,
Vamsi

0 George Mock over 5 years ago

TI__Guru**** 253410 points

Richard R said:
For this functionality it is necessary to generate app which functionality is independent of its location in memory

The usual term for this feature is position independent code. Unfortunately, the C28x compiler has no support for position independent code. Code that resides at different addresses will have differences entirely due to that one fact alone.

Thanks and regards,

-George

0 Richard R over 5 years ago in reply to George Mock

Prodigy 70 points

Thank you for the answer, we will use another solution

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Compiler/TMS320F280049: Firmware update mechanism