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+.\"	$NetBSD: astro.4,v 1.2 2017/02/17 22:24:46 christos Exp $
+.\"	OpenBSD: astro.4,v 1.3 2007/05/31 19:19:54 jmc Exp
+.\"
+.\" Copyright (c) 2007 Mark Kettenis <kettenis@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd February 17, 2017
+.Dt ASTRO 4 hppa
+.Os
+.Sh NAME
+.Nm astro
+.Nd Astro Memory and I/O controller
+.Sh SYNOPSIS
+.Cd "astro* at mainbus?"
+.Cd "elroy* at astro?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the Astro memory and I/O controller used
+on systems with PA-8500 and later 64-bit CPUs.
+It functions as a bridge from the Runway bus to
+up to 8 I/O ropes that connect to Elroy chips.
+Astro contains an IOMMU and provides support for cache coherent DMA.
+.Sh SEE ALSO
+.Xr hppa/cpu 4 ,
+.Xr hppa/elroy 4 ,
+.Xr hppa/intro 4
+.\" .Xr runway 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 4.2 .
+It was ported to
+.Nx 6.0
+by Nick Hudson.