1.\" $NetBSD: uturn.4,v 1.2 2017/02/17 22:24:46 christos Exp $ 2.\" $OpenBSD: uturn.4,v 1.8 2008/04/27 19:33:39 jmc Exp $ 3.\" 4.\" Copyright (c) 2004 Michael Shalayeff 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF MIND, 22.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd February 17, 2017 28.Dt UTURN 4 hppa 29.Os 30.Sh NAME 31.Nm uturn 32.Nd U2/Uturn, Runway to GSC Bus I/O Adapter 33.Sh SYNOPSIS 34.Cd "uturn* at mainbus?" 35.Cd "astro* at uturn?" 36.Cd "dino* at uturn?" 37.Cd "lasi* at uturn?" 38.\" .Cd "gecko* at uturn?" 39.Cd "sti* at uturn?" 40.Sh DESCRIPTION 41.Nm 42provides the functionality of an I/O Adapter (IOA) from the Runway 43CPU and memory bus to two GSC busses. 44Modern systems, based on the PA-8000 and later 64-bit CPUs, use the 45.Nm U-Turn 46version, whilst earlier systems, based on the PA-7200 CPU, used 47a different version of the chip called 48.Nm U2 . 49.Sh SEE ALSO 50.Xr hppa/astro 4 , 51.Xr hppa/cpu 4 , 52.Xr hppa/dino 4 , 53.\" .Xr gecko 4 , 54.Xr hppa/gsc 4 , 55.Xr hppa/intro 4 , 56.Xr pci 4 , 57.Xr sti 4 58.Sh HISTORY 59The 60.Nm 61driver 62appeared in 63.Ox 3.7 . 64It was ported to 65.Nx 6.0 66by Nick Hudson. 67