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.\" $OpenBSD: uturn.4,v 1.5 2004/09/26 20:11:51 mickey Exp $
.\"
.\" Copyright (c) 2004 Michael Shalayeff
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF MIND,
.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd September 13, 2004
.Dt UTURN 4 hppa
.Os
.Sh NAME
.Nm uturn
.Nd U2/Uturn, Runway to GSC Bus bridge & IOA
.Sh SYNOPSIS
.Cd "uturn* at mainbus?"
.Cd "dino* at uturn?"
.\" .Cd "elroy* at uturn?"
.Cd "lasi* at uturn?"
.\" .Cd "sti* at uturn?"
.Sh DESCRIPTION
.Nm
provides the functionality of IOA (not currently supported) as a bridge
from the Runway bus (see
.Xr runway 4
for more information) to GSC.
Modern systems, based on the PA-8000 and later 64-bit CPUs, use the
.Nm U-Turn
version, whilst earlier systems, based on the PA-7200 CPU, used
a different version of the chip called
.Nm U2 .
.Sh SEE ALSO
.Xr cpu 4 ,
.Xr dino 4 ,
.\" .Xr elroy 4 ,
.Xr gsc 4 ,
.Xr intro 4 ,
.Xr pci 4 ,
.Xr runway 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Ox 3.7 .
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