Serial console problems with stable/8
olli at lurza.secnetix.de
Mon Sep 13 17:00:15 UTC 2010
John Baldwin wrote:
> On Monday, September 13, 2010 11:55:27 am Oliver Fromme wrote:
> > I think the boot.config stuff might be a red herring.
> > The console breaks (i.e. freezes) as soon as I try to run
> > a getty process on it -- That seems to indicate that getty
> > does *something* to the console device which causes the
> > problem. The wchan "ttydcd" seems to indicate is has
> > something to do with carrier detection or flow control.
> > This points to the uart driver as the culprit which
> > replaced sio.
> Well, /dev/ttyXX have always waited for carrier detect, whereas
> /dev/cuaXX (the call-out devices) have not.
Well, before the update I had ttyd0 in /etc/ttys (this is
the default in FreeBSD 7.x), so it should have waited for
carrier detect, too.
> That was so that you could hook a modem up to a serial port and getty
> would not return from open(2) and print a login banner until someone
> dialed the modem and connected. I think Jeremy has already given you
> some good things to try (such as 3wire.9600) to debug this instead.
Yes, I will try that ... But with the 3wire entry I won't
have any flow control at all, so output can be lost, right?
Doesn't sound like a good solution.
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M.
Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung:
secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün-
chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart
FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd
"Documentation is like sex; when it's good, it's very, very good,
and when it's bad, it's better than nothing."
-- Dick Brandon
More information about the freebsd-stable