[ECOS] mysterious behavior in serial ports

[Chuck McManis <ecos at mcmanis dot com>]

So per Andrews comment I found that yes, I can force /dev/tty0 to be 
stdin/out (cool) and as long as I talk to Redboot on COM1 first it becomes 
/dev/ttydiag so no worries about stalling the system by polling the serial 
port.

However, I have a simple loop that goes:
    while (1) {
	char buf[200];

	printf("Enter some text : ");
	gets(buf);
	printf("'%s'\n", buf);
    }

Basically get some text and print it out. The weird behavior is that the 
text doesn't show up, pause .... pop out comes the Enter ..text prompt. 
Start typing and see nothing then suddenly poof! all caught up and 
following my keystrokes in real time.

So I assume this is some sort of high water/ low water buffering behavior. 
Can I turn it off so that text comes out right away and echoes right away?

--Chuck


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