From: tytso@ATHENA.MIT.EDU (Theodore Ts'o) Subject: Re: Problems with 0.98 and serial ports Date: Sat, 3 Oct 1992 02:13:23 GMT
From: n217cg@tamuts.tamu.edu (Scott Taylor)
Date: Fri, 2 Oct 1992 00:05:25 GMT
I am having the same problem. I upgraded from 0.96c pl2 to 0.98
(with SCSI), and now during bootup the serial code doesn't report
my internal modem (Zoom somthing-or-other, 2400 baud, IRQ 5,
port 0x3e8)..... maybe some of the more refined
serial port detection code in 0.98 isn't fooled by the modem's
serial chip (it's not a regular UART; it used to get reported as
a 16450).
Yup, that sounds like it. The new code uses the loop-back device to
make sure that there's really a UART at that location (as opposed to a
SCSI controller ---- which turns out to be a problem since there is a
port conflict between the Accent Async board and Ultrastor SCSI
adaptors. Fortunately, (once a minor bug was fixed) the serial driver
can figure out that there really isn't a UART there and not screw
anything up.
It soudns like the Zoom internal modem doesn't do a good enough
emulation of a National Semiconductor UART, so that the loopback test
failed. Except for the fact that no startup message is printed, it
shouldn't cause any harm, though.
- Ted