[Suns-at-Home] IPX Serial port speed (OpenBSD)

[Sandwich Maker]

" From: Alex Carver <agcme2002 at yahoo.com>
" 
" --- On Thu, 2/18/10, Sandwich Maker <adh at an.bradford.ma.us> wrote:
" 
" > From: Sandwich Maker <adh at an.bradford.ma.us>
" > 
" > " From: Alex Carver <agcme2002 at yahoo.com>
" > " 
" > " If I remember correctly, the IPX on-board serial ports will support up
" > " to 38400 baud.  My current problem is that I can't seem to change it
" > " to anything other than 9600.  In OpenBSD, I use stty to change it
" > " (logged in as root) and it always bounces back to 9600.  Is there
" > " something else conflicting with the port speed?
" > " 
" > " Serial consoles are disabled since I have a keyboard and monitor
" > " plugged in.
" > 
" > is there a getty running on it?
" > 
" > []
" 
" No gettys are enabled on the ports.  The getty config file has them
" both set to "off".  As far as I can tell, nothing else has control of
" the ports.  Every time I use stty, though, it shows this:
" 
" #stty -f /dev/ttya speed 19200
" 9600
" #
" 
" There's a brief delay while it runs the command and before it prints
" out the 9600.

this sure smells like another process...

what if you try
stty -f /dev/ttya 19200 speed 
?  probably nothing different.

" Is there a way to check if something has grabbed the port?

do you have fuser?  on solaris and probably other sV offspring, it can
show the pid and uid of any process using the file, which can be
regular, device special, etc.

" > From: Matt Crawford <matt8128 at dls.net>
" > 
" > []
" > 
" > 
" > As soon as the device is closed, it reverts to the default.
" > So you have to set it from a process that keeps it open, or
" > engage in some other trickery:
" > 
" > 
" > ( stty 38400; myprog ) < /dev/ttyb 2>&1 > /dev/ttyb
" 
" I'm using this port with a GPS and gpsd so I can turn it into a
" basic time server.  Gpsd itself is supposed to be able to change
" the port speed while it's running but it complains that it can't
" and the port always stays stuck at 9600.
" 
" So would this work:
" 
"  ( stty 38400 && gpsd /dev/ttyb )
" 
" Keeping everything in a single process or am I going to get stuck again?

my instinct is that it'll bounce back to 9600 when the stty exits.
even if it does work, i don't think you can rely on it until you find
out why it's misbehaving to start with.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh at an.bradford.ma.us                       and think what none thought