Similar to the recent commit in tms570-sci.c, the assumption that a UART will
only see printable ASCII characters, instead of any value in the range
0x00-0xFF, is wrong.
A non forgiving binary protocol will be thrown off by this driver sending
"\r\r\r\r" when initializing.
If a user wants to flush the interface, they should explicitely use the
dedicated function `tcflush(fd, TCIOFLUSH);`.
7be49773c0