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Bootloader for MC9S08DZ60

Question asked by Mr. Kress on May 27, 2011
Latest reply on Jun 7, 2011 by Mr. Kress

Hi @ all,

 

I'm trying to implement a Bootloader on my MC9S08DZ60.

I have several questions but I didn't find any answers in the forums that match to my problem. So I am looking foreward to your replies.

 

1. is it possible to flash the bootloader in the protected section of ROM?

I want to make a application in C for the bootloader code which can flash a application program via CAN bus.

 

2. How is it possible to flash the user application to another ROM-Adress (unprotected)?

 

3. How can I jump from user application to bootloader and from bootloader to user application?

 

4. Can I flash two different programms with P&E micro USB Multilink interface? This is for testing the jumps between user application and bootloader. How should I do this? What files have to be adjusted?

 

5. Do you know other issues I have to take care about (Interrupt vector table relocation, .prm-file modifications)?

 

I use:

CodeWarrior 5.9.0

PE micro USB multilink interface

 

 

For the background informaton: The bootloader which I have to develop will be programmed to each ECU. The user application will be done seperately and should be flashed onto the controller via CAN-Bus. If an Reset occours the bootloader should start and chack, if there is a user application programmed. If so the bootloader should start the user application.

When the user application receives a special CAN-Message the bootloader should start agaín to erase the chip and flash a new user application.

When no user application is programmed on the chip the bootloader should run and wait for the user application to be flashed.

My idea is to programm a bootloader and locate it into a protected area of the Flash ROM with PE micro. When a user application is developed it should be possible to flash it into the unprotected area of Flash ROM also using PE micro but without overwriting the bootloader.

 

I read AN 2295 but I don't have experience with assembler code. The application will be programmed in C. 

 

 

Thank you very much for your help.

 

Regards

Michael

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