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I am using the STM32F0 discovery kit which looks like this;

enter image description here

In the MCU datasheet, it mentioned about 3 boot modes;

  • boot from User Flash memory
  • boot from System Memory
  • boot from embedded SRAM

Which mode does the STM32F0 discovery kit use by default? How can one change which mode to use?

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I recommend you to read the STM32F0 Discovery kit's documentation as it holds many answers for many uprising questions. More documentation can be found here.

But to help you out with this one, this is the schematic of the STM32F0 Discovery regarding the boot configuration:

enter image description here

R27 is Not Fitted but SB2 solder bridge is on by default so the boot pin is pulled down to ground through 510 \$ \Omega \$ (R26).

enter image description here

Bold is the default configuration. You can change it by soldering R27 and cutting off (remove the solder) the SB2 solder bridge. All of these designators can be found on your board as white texts.

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