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+.\"	$NetBSD: intro.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 INTRO 4 emips
+.Os
+.Sh NAME
+.Nm intro
+.Nd introduction to emips special files and hardware support
+.Sh DESCRIPTION
+This section describes the special files, related driver functions,
+and networking support available in the system.
+In this part of the manual, the
+.Tn SYNOPSIS
+section of each configurable device gives a sample specification
+for use in constructing a system description for the
+.Xr config 1
+program.
+The
+.Tn DIAGNOSTICS
+section lists messages which may appear on the console
+and/or in the system error log
+.Pa /var/log/messages
+due to errors in device operation; see
+.Xr syslogd 8
+for more information.
+.Pp
+This section contains both devices which may be configured into
+the system and network related information.
+The networking support is introduced in
+.Xr netintro 4 .
+.Sh DEVICE SUPPORT
+This section describes the hardware supported on eMIPS
+(Microsoft Extensible MIPS processor)-based platforms.
+Software support for these devices comes in two forms.
+A hardware device may be supported with a character or block
+.Em device driver ,
+or it may be used within the networking subsystem and have a
+.Em network interface driver .
+Block and character devices are accessed through files in the file
+system of a special type; see
+.Xr mknod 8 .
+Network interfaces are indirectly accessed through the interprocess
+communication facilities provided by the system; see
+.Xr socket 2 .
+.Pp
+A hardware device is identified to the system at configuration time
+and the appropriate device or network interface driver is then compiled
+into the system.
+When the resultant system is booted, the autoconfiguration facilities
+in the system probe for the device and, if found, enable the software
+support for it.
+If a device does not respond at autoconfiguration
+time it is not accessible at any time afterwards.
+To enable a device which did not autoconfigure,
+the system must be rebooted.
+.Pp
+The autoconfiguration system is described in
+.Xr emips/autoconf 4 .
+A list of the supported devices is given below.
+.Sh SEE ALSO
+.Xr config 1 ,
+.Xr emips/autoconf 4
+.Sh SUPPORTED SYSTEMS
+The following systems are supported:
+.Pp
+.Bl -tag -width speaker -offset indent -compact
+.It BeSquare BErkeley Emulation System-3 FPGA development board
+known as the "BEE3".
+This is a quad-chip FPGA system where eMIPS can run on each FPGA separately,
+on multiple FPGAs in concert, and in multi-processor configurations.
+.It Xilinx University Program board
+known as "XUP".
+This is the Xilinx reference board for the Virtex-5 series chips.
+It can use the same XL110T FPGA chip present on the BEE3.
+.It Xilinx ML402
+Xilinx reference board for the Virtex-4 series chip, including the SX35.
+.It Xilinx ML401
+Same as the above, but with the smaller LX25 chip.
+.El
+.Sh LIST OF DEVICES
+The devices listed below are supported in this incarnation of the system.
+Devices are indicated by their functional interface.
+Not all supported devices are listed.
+.Pp
+.Bl -tag -width speaker -offset indent -compact
+.It ace
+Xilinx SystemACE interface for Compact-FLASH cards, bears similarities to the IDE interface.
+Present on XUP and ML40x boards.
+Not present on BEE3.
+.It dz
+serial driver for the eMIPS console serial device.
+Present on all systems.
+.It enic
+Ethernet driver for the eNIC device.
+Present on XUP and BEE3 systems.
+Not present on ML40x systems.
+.It eclock
+System clock, must be configured on all systems.
+.It ebus
+Extensible BUS, present on all systems.
+.El
+.Sh HISTORY
+This
+.Tn eMIPS
+.Nm intro
+appeared in
+.Nx 6.0 .