boards/st/stm32f3_disco/board.yml

board:
  name: stm32f3_disco
  full_name: STM32F3 Discovery
  vendor: st
  revision:
    format: letter
    default: "B"
    revisions:
      - name: "B"
      - name: "E"
  socs:
    - name: stm32f303xc