70 lines
2.3 KiB
Groff
70 lines
2.3 KiB
Groff
.\" $NetBSD: uturn.4,v 1.1 2010/06/24 16:34:51 skrll Exp $
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.\" $OpenBSD: uturn.4,v 1.8 2008/04/27 19:33:39 jmc Exp $
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.\"
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.\" Copyright (c) 2004 Michael Shalayeff
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF MIND,
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 24, 2010
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.Dt UTURN 4 hp700
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.Os
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.Sh NAME
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.Nm uturn
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.Nd U2/Uturn, Runway to GSC Bus I/O Adapter
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.Sh SYNOPSIS
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.Cd "uturn* at mainbus?"
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.Cd "astro* at uturn?"
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.Cd "dino* at uturn?"
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.Cd "lasi* at uturn?"
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.\" .Cd "gecko* at uturn?"
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.Cd "sti* at uturn?"
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.Sh DESCRIPTION
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.Nm
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provides the functionality of an I/O Adapter (IOA) from the Runway
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CPU and memory bus to two GSC busses.
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Modern systems, based on the PA-8000 and later 64-bit CPUs, use the
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.Nm U-Turn
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version, whilst earlier systems, based on the PA-7200 CPU, used
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a different version of the chip called
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.Nm U2 .
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.Pp
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.Nm
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operates in real mode and doesn't make use of the I/O TLB.
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.Sh SEE ALSO
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.Xr astro 4 ,
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.Xr cpu 4 ,
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.Xr dino 4 ,
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.\" .Xr gecko 4 ,
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.Xr gsc 4 ,
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.Xr intro 4 ,
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.Xr pci 4 ,
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.Xr sti 4
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.Sh HISTORY
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The
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.Nm
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driver
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appeared in
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.Ox 3.7 .
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It was ported to
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.Nx 6.0
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by Nick Hudson.
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