[aclug-L] Re: ttyS1=[alt + F4] [oh ooh]

[Jonathan Hall <jonhall@xxxxxxxxxxxx>]

Are your ttyS1 and ttyS3 still sharing an IRQ?

If so, change that!  :-)

That can cause very unpredictable results.

Also make sure you're using the -b option with mgetty in /etc/inittab


On Mon, Jan 03, 2000 at 11:30:40PM -0600, Michael Holmes wrote:
> 
> 
> Jonathan Hall wrote:
> 
> > Well... not really.  You can enable "console on serial port" in the
> > kernel... but that's not really what you're looking for I don't think, and
> > is probably more difficult to configure than mgetty.  :-)
> >
> > What specific problems are you having at this point?
> 
> it is locking up ttyS3, (my modem)  and the lock file is set up to 
> ttyS1(onboard serial port 2)
> Which disables the modem(it dials out, and as it is setting up with the 
> server, it hangs up just
> as connection is made.)  Also parallel port has a lock file on it also. I 
> take the
> s1:234:respawn:/etc/mgetty.....  off the inittab  (#   added to first of 
> line) the modem (PPP0)
> and the printer both start working on reboot.  If I remover the # from it and 
> reboot, modem and
> printer stop.  If I try uugetty, I get respawning too quickly deactivating s1 
> for 5 minutes.
> When I log on to Linux side, I will copy the inittab and config file for S1 
> and send it to the
> list.  ( I was on Micro$oft windoz doing home work for work (I wrtie in VC++) 
> [too lazy to learn
> gtk-although I am now reading the howto!] )
> 
> >
> >
> > On Mon, Jan 03, 2000 at 11:11:55PM -0600, Michael Holmes wrote:
> > > I ended up took the addition off the inittab, for now, I am lazy and I 
> > > will make it work!!
> > > I wonder if I could put a ttys(X) into the kernel directly.
> > >
> > > Michael
> > >
> > > Jonathan Hall wrote:
> > >
> > > > > > You're trying to do PPP over the connection?
> > > > >
> > > > > no, ppp0 would be over ttyS3-- isa pnp modem--jumper set
> > > >
> > > > Okay
> > > >
> > > > > > There's no reason you shouldn't be able to... I just didn't know 
> > > > > > that's what
> > > > > > you were trying to do.
> > > > > >
> > > > > > What you describe sounds like a possible IRQ conflict... Are you 
> > > > > > sure
> > > > > > nothing else is using the same IRQ ttyS1 is using (IRQ3 would be 
> > > > > > normal).
> > > > >
> > > > > not now, but when up and running there will be a crash if I tried to 
> > > > > bring up the ppp
> > > > > while I was using the ttyS1 as they share the same IRQ.
> > > >
> > > > If at all possible, you really should get different IRQs for each serial
> > > > port...e ven if you aren't using the same IRQ on two ports at the same 
> > > > time.
> > > > Set ttyS3 to IRQ5 or something if you can.  I'd be willing to bet that 
> > > > this
> > > > sharing of IRQs is what's causing your problems.
> > > >
> > > > > > Also... are you using a null-modem cable, or a standard serial 
> > > > > > cable?
> > > > >
> > > > > yes I am using a null modem, and I do get use out of it now, but when 
> > > > > the mgetty line
> > > > > is in my inittab, it also places a lock file on the ppp also.  The 
> > > > > ppp is dialing and
> > > > > then sees the lock file, and hangs up.
> > > >
> > > > There's a way to share the line between ppp and mgetty... see the 
> > > > mgetty man
> > > > page, I don't remember the exact mgetty switch to use right off hand.  
> > > > I do
> > > > know I have done it before, though.
> > > >
> > > > > > And are both ends attempting to communicate at 38400?  And do both 
> > > > > > ends
> > > > > > have at least 16450 UARTs (I would assume they do if they're 486's 
> > > > > > or
> > > > > > newer).
> > > > >
> > > > > they are both set at the same speed first 19200 then I bumped it to 
> > > > > 38400.  If they
> > > > > are at different speeeds, you get gibberish at both ends.  I get the 
> > > > > proper graphics
> > > > > and communications, but it is only 16 bytes shot down, and then it 
> > > > > waits 120 seconds
> > > > > and sends another 16 bytes..... (this is on the direct connection)
> > > >
> > > > Okay.  If they're both using 16550 UARTs, you should be able to go 
> > > > clear up
> > > > to 115200 without problems... Probably not a big deal if you're just 
> > > > doing
> > > > text stuff, but if you start using PPP or transfering files over the 
> > > > link,
> > > > etc, the extra speed will no doubt be appreciated. :-)
> > > >
> > > > --
> > > > "I'm just glad it'll be Clark Gable who's falling on his face and not 
> > > > Gary
> > > > Cooper." -- Gary Cooper, on his decision to not take the leading role in
> > > > "Gone With The Wind."
> > > > --
> > > > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > > >   Jonathan Hall  *  jonhall@xxxxxxxxxxxx  *  PGP public key available
> > > >  Systems Admin, Future Internet Services; Goessel, KS * (316) 367-2487
> > > >          http://www.futureks.net  *  PGP Key ID: FE 00 FD 51
> > > >                   -=  Running Debian GNU/Linux  =-
> > > > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > >
> >
> > --
> > Floppy disk tip #4: Never insert a diskette into the drive upside down.  The
> > data can fall off the surface of the disk and jam the intricate mechanics of
> > the drive.
> > --
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> >   Jonathan Hall  *  jonhall@xxxxxxxxxxxx  *  PGP public key available
> >  Systems Admin, Future Internet Services; Goessel, KS * (316) 367-2487
> >          http://www.futureks.net  *  PGP Key ID: FE 00 FD 51
> >                   -=  Running Debian GNU/Linux  =-
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> 

--
"If I had thought about it, I wouldn't have done the experiment. The
literature was full of examples that said you can't do this." -- Spencer
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--
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  Jonathan Hall  *  jonhall@xxxxxxxxxxxx  *  PGP public key available
 Systems Admin, Future Internet Services; Goessel, KS * (316) 367-2487
         http://www.futureks.net  *  PGP Key ID: FE 00 FD 51
                  -=  Running Debian GNU/Linux  =-
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