SAMD09 supports for boot over I2C ?

[muthukural001]

Hello All,

I am going to start a project with SAMD09 microcontroller.Before going for fabrication, I want to know whether it supports Boot from external EEPROM which is connected on I2C or not. Please let me know....


Regards,
Muthu

[mikerj]

There is no built in bootloader, but it does offer support for a custom bootloader.  If you need this functionality you would have to write the code and locate it in the memory area defined for bootloader operation, and set the configuration fuses to protect your bootloader.

[muthukural001]

Hi mikerj,

Understood. But, I don't know that how to load external EEPROM with our application .hex?. Is they are using any PC software to write .hex file to External EEPROM?.Once this has done , I can read that .hex from External EEPROM in Bootlaoder mode and write it to the program memory of the Microcontroller.


Regards,
Muthu

[ataradov]

I'm not aware of any bootloader that will do exactly this. But there are examples of bootloaders out there, you just need to adopt them to your needs.

Start from writing a code that reads external EEPROM. Samples of that code and bootlaoders are available on my GitHub.

You may want to switch from hex to just plain binary, this will make your life simpler.

[WillHuang]

I don't think there is a way to DIRECTLY boot from the external eeprom as the uC needs to know a valid starting address of the reset vector. However, what you can do is have the bootloader copy the image from the EEPROM to the uC's memory space and then run the image from there.