When 'CPU' is defined, the CPU Makefile.features is included by the build system in the main Makefile.features. No need to do it manually anymore.
Peripheral configured: - 5 UARTs for stdio via STLink, Arduino connector, PMOD connector, STMOD+ connector and ESP-01 connector - 1 I2C available on Arduino connector and STMOD+ connector - 2 SPIs available on Arduino connector and PMOD connector