🚀 go-pugleaf

It's time for a bleary eyed dump of some questions I'm interested in
hearing answered. These focus on some thought experiments about the
(Sun/sparc) serial ports. I'm assuming outbound modem i/o in all cases below.

(I hope these questions aren't too cryptically worded.)

	* stty says: raw, clocal, cread. Will this CPU interrupt per character?

	* canonical processing does not translate into one interrupt per
	character? (Certainly flush happens with new lines, and echoing is
	documented in termio(4) as immediate. So please contrast here.)

	* tty interrupt priority vs. SCSI bus interrupts. How do they
	compare logically?

	* how much write(2) i/o before get flow control from serial device,
	not the DCE.

	* fwrite(3) should allow more than write(2), yes?

	* does the device driver dma (written) data onto the serial line
	driver/chip. 
	
		+ If so, does the dma need to terminate on a page aligned
		boundary, as with other (e.g., intel) dma character
		devices.

		+ Corollary: nonpage aligned portions are copied in/out, else
		direct dma from page aligned portions of a process' true
		buffer.

		
I would deeply appreciate e-mailed answers, and I will try posting a
cogent summary.

Thanks in advance,
= Mak