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+.\"	$NetBSD: ebus.4,v 1.4 2017/02/17 22:24:46 christos Exp $
+.\"
+.\" Copyright (c) 2010 NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This file is derived from work contributed by Microsoft Corporation.
+.\"
+.\" 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 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 February 17, 2017
+.Dt EBUS 4 emips
+.Os
+.Sh NAME
+.Nm ebus
+.Nd eMIPS Extensible I/O BUS driver
+.Sh SYNOPSIS
+.Cd "ebus0 at mainbus0"
+.Sh DESCRIPTION
+.Nm
+is a virtual device for the Extensible I/O BUS realized with eMIPS
+on FPGA boards such as the BEE3, Xilinx XUP, and Xilinx ML40x systems.
+.Pp
+Devices on the BUS can generally be relocated and can be found by
+scanning the Peripheral Mapping Table at the top of the BUS physical space.
+The driver is responsible for identifying devices that are currently available,
+and to map them into the kernel virtual space during the kernel startup procedure.
+.Pp
+The
+.Nm
+driver manages the Extensible I/O BUS on eMIPS and provides
+.Pp
+.Bl -bullet -offset indent
+.It
+Address range management to avoid conflicts.
+.It
+Interrupt vector management.
+.It
+Other utility functions.
+.El
+.Pp
+.Nm
+is always required to run the
+.Nx
+kernel.
+.Sh SEE ALSO
+.Xr emips/ace 4 ,
+.Xr emips/dz 4 ,
+.Xr emips/eclock 4 ,
+.Xr emips/enic 4 ,
+.Xr emips/intro 4