File content as of revision 0:02dd72d1d465:

{
    "name": "platform",
    "config": {
        "stdio-convert-newlines": {
            "help": "Enable conversion to standard newlines on stdin/stdout/stderr",
            "value": false
        },

        "stdio-convert-tty-newlines": {
            "help": "Enable conversion to standard newlines on any tty FILE stream",
            "value": false
        },

        "stdio-buffered-serial": {
            "help": "Use UARTSerial driver to obtain buffered serial I/O on stdin/stdout/stderr. If false, unbuffered serial_getc and serial_putc are used directly.",
            "value": false
        },

        "stdio-baud-rate": {
            "help": "Baud rate for stdio",
            "value": 9600
        },

        "stdio-flush-at-exit": {
            "help": "Enable or disable the flush of standard I/O's at exit.",
            "value": true
        },

        "default-serial-baud-rate": {
            "help": "Default baud rate for a Serial or RawSerial instance (if not specified in the constructor)",
            "value": 9600
        },

        "force-non-copyable-error": {
            "help": "Force compile time error when a NonCopyable object is copied",
            "value": false
        },

        "poll-use-lowpower-timer": {
            "help": "Enable use of low power timer class for poll(). May cause missing events.",
            "value": false
        }
    },
    "target_overrides": {
        "EFM32": {
            "stdio-baud-rate": 115200
        },
        "EFR32": {
            "stdio-baud-rate": 115200
        }
    }
}