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From: Wilko Bulte <wilko@yedi.iaf.nl>
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Subject: Re: HELP: serial port grief on Asus P55TP4N
To: bde@zeta.org.au (Bruce Evans)
Date: Sun, 23 Jun 1996 00:11:54 +0200 (MET DST)
Cc: FreeBSD-hackers@freebsd.org, revr@cadre.nl
In-Reply-To: <199606221912.FAA09329@godzilla.zeta.org.au> from "Bruce Evans" at Jun 23, 96 05:12:54 am
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As Bruce Evans wrote...

> >I'm sending this to -hackers on behalf of a friend of mine who has 
> >just converted to FreeBSD 2.1R. His system is a P100 on a Asus
> >P55TP4N with 32Mb, SC200 and ATI Mach64 VGA.
> 
> >He has all sorts of problems when using the internal serial ports
> >of the Asus in combination with UUCP. It's really weird... :-(
> 
> >The uucp config files are identical to mine (I have a P55TP4XE).
> 
> >Symptoms:
> 
> >- when X was running -> console messages 'tty level buffer overflow'
> >- without X -> errors logged by uucp 'uucp checksum failed'
> >- he also tried ijppp and that seems to work OK... (???)
> 
> Uucp checksum errors are known to be caused by bugs in the UMC i/o
> chip which is found in some ASUS motherboards (e.g. the P55TP4XE
> rev.2.4).  The UARTs lose sync when their speed is set while data

Bruce, are you sure about the P55TP4XE? I just spent some time with a
flashlight to inspect my XE and found a SMC FDC37C665IR chip that
(looking at the etch wiring) seems to (also) control the serial lines.
I could not find a UMC chip on my mainboard.

Rene (the 'problem owner') could you please check your mainboard to
see which chip it uses?

Wilko
_     __________________________________________________________________________
 |   / o / /  _   Wilko Bulte             email: wilko@yedi.iaf.nl
 |/|/ / / /( (_)  Private FreeBSD site  - Arnhem - The Netherlands
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