1.\" $NetBSD: ebus.4,v 1.4 2017/02/17 22:24:46 christos Exp $ 2.\" 3.\" Copyright (c) 2010 NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This file is derived from work contributed by Microsoft Corporation. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27.\" 28.Dd February 17, 2017 29.Dt EBUS 4 emips 30.Os 31.Sh NAME 32.Nm ebus 33.Nd eMIPS Extensible I/O BUS driver 34.Sh SYNOPSIS 35.Cd "ebus0 at mainbus0" 36.Sh DESCRIPTION 37.Nm 38is a virtual device for the Extensible I/O BUS realized with eMIPS 39on FPGA boards such as the BEE3, Xilinx XUP, and Xilinx ML40x systems. 40.Pp 41Devices on the BUS can generally be relocated and can be found by 42scanning the Peripheral Mapping Table at the top of the BUS physical space. 43The driver is responsible for identifying devices that are currently available, 44and to map them into the kernel virtual space during the kernel startup procedure. 45.Pp 46The 47.Nm 48driver manages the Extensible I/O BUS on eMIPS and provides 49.Pp 50.Bl -bullet -offset indent 51.It 52Address range management to avoid conflicts. 53.It 54Interrupt vector management. 55.It 56Other utility functions. 57.El 58.Pp 59.Nm 60is always required to run the 61.Nx 62kernel. 63.Sh SEE ALSO 64.Xr emips/ace 4 , 65.Xr emips/dz 4 , 66.Xr emips/eclock 4 , 67.Xr emips/enic 4 , 68.Xr emips/intro 4 69