Date: Sat, 20 Jan 2001 11:25:26 +1100 (EST) From: Andy Farkas <andyf@speednet.com.au> To: Bruce Evans <bde@zeta.org.au> Cc: bauerp <bauerp@bigfoot.com>, freebsd-bugs@FreeBSD.ORG Subject: Re: serial port problems Message-ID: <Pine.BSF.4.21.0101201115420.25091-100000@backup.af.speednet.com.au> In-Reply-To: <Pine.BSF.4.21.0101101647440.25177-100000@besplex.bde.org>
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On Wed, 10 Jan 2001, Bruce Evans wrote:
> > I hope this is something that can be addressed. Last night i went to
> > attach a console to a switch i was working on. Every time i went to
> > attach to the serial port my system locked. cu -l /dev/cuaa0 minicom and
> > tip all displayed the same results.
> >
> > I looked through dmesg to see nothing out of the ordinary. sio0 and sio1
> > found properly, all appeared normal. Fortunately being untrusting of pc
> > hardware i checked the bios to find that the serial ports had been
> > disabled. After re-enabling them this behavior went away.
> >
> > Is it possible to have some change in status mentioned in dmesg stating
> > that the serial ports are infact not operational? Probing them and
> > assigning irq's to the device that isn't enabled is not very intuitive
> > when it comes to trouble shooting this.
>
> The driver already does an unreasonable amount of checking at probe
> time that the ports work. It even checks that interrupts work.
> Non-working interrupts caused the probe to fail in FreeBSD-2, but now
> certain types of broken interrupts only result in a boot message like
> "configured irq 4 not in bitmap of probed irqs 0". I don't know how
> this particular failure would cause a lockup.
>
> Bruce
Well, I think something is wrong with the probe, 'cause this machine does
not have any serial ports (it used to) yet says:
...
FreeBSD 4.1.1-STABLE #0: Sat Oct 14 19:20:47 EST 2000
...
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 8250
...
The probe did not pick up the fact that there is no serial port.
This is an old dual P90 MB with no onboard coms or lpt.
--
:{ andyf@speednet.com.au
Andy Farkas
System Administrator
Speednet Communications
http://www.speednet.com.au/
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