forked from Imagelibrary/rtems
<e.norum@sk.sympatico.ca> and concerns from Thomas Doerfler <td@imd.m.ISAR.de> when he submitted the patch: Since enabling XON/XOFF has such a major performance hit on `smart' output devices I think it should be *off* by default. I think some thought should be given to adding hooks for hardware that can support XON/XOFF without software intervention, or for hardware like the 68360 SCC's that can use large buffers, but still handle special characters immediately. The patch you sent is a very good start, though. I just think that the software flow control should be off -- to match the way the serial I/O support has worked up until now.