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Date:      Fri, 20 Nov 2009 00:10:48 -0800
From:      perryh@pluto.rain.com
To:        karl@denninger.net
Cc:        freebsd-stable@freebsd.org
Subject:   Re: V8.x-PRE2 Serious PUC problem - Heads Up!
Message-ID:  <4b064f08.QD1V6fZm4C5kf4Qb%perryh@pluto.rain.com>
In-Reply-To: <4B054F6D.70300@denninger.net>
References:  <4B054DCC.6020701@denninger.net> <200911191357.nAJDvd3X095748@lava.sentex.ca> <4B054F6D.70300@denninger.net>

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Karl Denninger <karl@denninger.net> wrote:
> ... the uart driver is BROKEN.
>
> It simply locks up on the port after some period of time,
> returning nothing.  I have found no way to reset the port
> other than a reboot either ...

Welcome to the distant past.  I'll be interested to see what
the root cause turns out to be.

I've seen the same symptoms on:

* A Sun-3/50 running SunOS 4.1.1_U1, using ttyb;

* A Sun Ultra 2 running (IIRC) Solaris 2.5,
  using an Aurora multi-port S-Bus card;

* A Sun Ultra 10, using an Aurora multi-port PCI card.

The Suns were using Aurora drivers.  I was never able to get one of
those systems' ttya or ttyb (using Sun drivers, of course) to hang
that way.



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