2314635cf0
Allow examples (such as usart-semihosting) to set DEFS for their own use, and _then_ add the target definitions.
Examples in these directories are not only for the board listed, they are simply preconfigured for those boards. If you do not find an example of the peripheral you want to use listed for your board, please look at the other boards. The differences between boards for the examples is normally only LEDs and buttons on different pins, and different memory sizes.