Serial Bootloader on S12ZVH

[rajnirajpoot]

Hi Everyone,

I have to implement uart bootloader on S12 ZVH. which document i need to follow. I got two application notes on AN12086 and AN4723. 

Please let me know which one is easier to follow .

Thanks & Regards,

Rajni

[dianabatrlova]

Hello Rajni,

If you want to check how linker file looks like for S12ZVH128 application project the fastest way is to create a new project for the S12ZVH128 in the Code Warrior and look into Linker_Files folder.

I hope it helps you.

Best regards,

Diana

[dianabatrlova]

Hi Rajni,

The Bootloader AN12086 is newer and is better processed.

In the application note, there is the detailed description of the bootloader.

That's my opinion. I hope it helps you.

Best regards,

Diana

[rajnirajpoot]

Hi Diana,

Thanks for reply , I have gone through this document and it is really helpful . one thing i want to know the security given in this document is by backdoor key is that enough to secure MCU or we have to try some security algorithm like AES128 .

Regards,

Rajni

[dianabatrlova]

Hi Rajni,

The MCU security mechanism is not intended to encrypt non-volatile memory.

For more information about the security of MCU see chapter 1.10 Security in the reference manual.

I chose some points: 

"The MCU security mechanism prevents unauthorized access to the flash memory.

The security features of the S12Z chip family are:
• Prevent external access of the non-volatile memories (Flash, EEPROM) content
• Restrict execution of NVM commands

Unsecuring the microcontroller can be done using Backdoor key access."

I hope the information helps.

Best regards,

Diana

[rajnirajpoot]

Hi Diana,

Thanks for reply. I have change my code as per given in AN12086 and able to start the communication and got this as hyper terminal output.

but when i try to program flash it will not respond anything. I am using s19 file as text file and which is generated by the same process as mentioned in application note. May be i am doing something wrong with memory addresses.

Can you help what to change in linker file for MCU MC9S12ZVH128.

It will really help me.

Thanks  & Regards,

Rajni

[dianabatrlova]

Hi Rajni,

The S-records must have a specified format.

At first, I need to ask did you use SRecCvt.exe tool for re-formating generated S-record file (s19 file)?

Please refer to chapter 4.4.     How to convert S-Record that will be downloaded by the Bootloader

Thank you.

Best regards,

Diana

[rajnirajpoot]

Hello Diana,

Yes i am using SRecCvt.exe tool for reformaring generated S-record file.

Thanks & Regards,

Rajni