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MSP430FR6879: designing custom Bootloader.

Part Number: MSP430FR6879


hi ,

I am new to embedded and dont know much about bootloader. From article and few reads i have got a basic knowledge of what it is. Now i need to make one for my device to remotely program it .

I know that ic has hardware bootloader - that supports bootloading via uart and may be even I2C , but my problem is that i cannot use these peripherals, as they are already in use by other device ,
over and above the module  from where msp430 is getting the code is connected via spi wherin msp430 is the slave .

In other words
I need to make a bootloader that fetches code using spi interface that too being in the slave condition .
first of all how far is it possible feasible,

This is the first time i will be making a bootloader so what are the articles that will help me with this(specifically for msp430 and general ). 
Where does the program start from on reset (reset vector). where do i find it in the data sheet i didnt find the mem map in the data sheet

Being a newbie I may sound foolish.

Kindly help me with this, 

Noble.

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