Changing the bootloader.

[carleslloret]

I just throw a question to the air... Is it possible to update the bootloader with a user application firmware? The user application user certainly can be updated with a bootloader... but it is possible to do the same with the bootloader?

The bootloader simply erases and saves some values into the eeprom . Is it possible to do the other way around?

Thank a lot.

[carleslloret]

What MCU do you use?

Did you consider the option of two bootloaders?

mc9s12xs128.

[dianabatrlova]

Hello,

Thank you for the details.

You can use CodeWarrior IDE and via BDM interface load the new bootloader into MCU.

Some possibilities how to update a bootloader can be found on the community thread below:

how could I update bootloader via bootloader?(s12xe) 

If you have an interest in the bootloader example for the S12X devices see below:

http://www.nxp.com/files/microcontrollers/doc/app_note/AN4258SW.zip 

SW:

https://www.nxp.com/files-static/microcontrollers/doc/app_note/AN4258.pdf 

I hope it helps.

Best Regards,

Diana

[dianabatrlova]

Hello Carles,

What MCU do you use?

Did you consider the option of two bootloaders?

The link below can be useful:

Simple Serial Bootloader for S12Z - AN draft 

I hope it helps.

Best Regards,

Diana