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Understanding boot mode in STM32

Question asked by pwdusid on Aug 19, 2015
Latest reply on Aug 19, 2015 by Clive One
Hi, 

I read datasheet STM32F072xx and  AN2606 but I have a lack of understanding what are User Flash memory, System memory and embedded memory boot mode. 
Does someone could explain me :
First of all I don't understand what "X memory  is selected as boot space".
1-Which are the differences and use for each of them?
2- Is all about internal bootloader?
3-Which mode should be chosen for a custom bootloader and why?

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