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+.\" $NetBSD: empb.4,v 1.13 2017/02/17 22:24:45 christos Exp $
+.\"
+.\" Copyright (c) 2012 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Radoslaw Kujawa.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``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 FOUNDATION OR CONTRIBUTORS
+.\" 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 EMPB 4 amiga
+.Os
+.Sh NAME
+.Nm empb
+.Nd ELBOX Mediator 1200 PCI bridge driver
+.Sh SYNOPSIS
+.Cd "empb0 at zbus0"
+.Cd "emmem0 at zbus0"
+.Cd "empm0 at zbus0"
+.Cd "pci* at empb0"
+.Cd "options PCI_NETBSD_CONFIGURE"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the PCI bus present on Mediator 1200 bridge for
+Amiga 1200.
+.Sh HARDWARE
+The
+.Nm
+driver supports the following hardware:
+.Bl -tag -offset indent
+.It ELBOX Mediator PCI 1200
+.It ELBOX Mediator PCI 1200 LT2
+.It ELBOX Mediator PCI 1200 LT4
+.It ELBOX Mediator PCI 1200 SX
+.It ELBOX Mediator PCI 1200 TX
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It empb: linear space mapping might not work
+The PCI card driver is trying map memory space with the
+.Dv BUS_SPACE_MAP_LINEAR
+flag.
+Due to the windowed design of Mediator, it is expected to fail miserably if
+normal memory space access methods (e.g., pointer dereference) are used
+instead of
+.Xr bus_space 9
+methods.
+.It empb%d: couldn't find memory space, check your WINDOW jumper
+PCI memory space access is disabled on a hardware level.
+The
+.Nm
+driver will work anyway, but only PCI I/O space will be accessible.
+To enable memory space set the WINDOW jumper to 4MB or 8MB.
+.El
+.Sh SEE ALSO
+.Xr amiga/em4k 4 ,
+.Xr amiga/mppb 4 ,
+.Xr amiga/p5pb 4 ,
+.Xr pci 4
+.Sh HISTORY
+The
+.Nm
+device first appeared in
+.Nx 7.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Radoslaw Kujawa Aq Mt radoslaw.kujawa@gmail.com .
+It was developed using information obtained through reverse engineering
+by
+.An Frank Wille
+and
+.An Radoslaw Kujawa .
+The authors have no access to official
+documentation (which is only available under NDA).
+.Sh CAVEATS
+Mediator ZIV might work but is untested.
+.Sh BUGS
+DMA to host memory is not supported.
+This is a hardware limitation.
+It is possible to implement DMA through bounce buffers in graphics card memory,
+but this needs further research.