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+.\" Copyright (c) 2010 Weongyo Jeong
+.\" All rights reserved.
+.\"
+.\" 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 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 8, 2010
+.Dt SIBA 4
+.Os
+.Sh NAME
+.Nm siba
+.Nd Sonic Inc. Silicon Backplane driver
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device siba"
+.Ed
+.Pp
+Alternatively, to load the driver as a module at boot time,
+place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+siba_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver supports the Sonic Inc. Silicon Backplane, the interblock
+communications architecture that can be found in most Broadcom
+wireless NICs.
+.Pp
+A bus connects all of the Silicon Backplane's functional blocks.
+These functional blocks, known as cores, use the Open Core Protocol
+(OCP) interface to communicate with agents attached to the Silicon
+Backplane.
+.Pp
+Each NIC uses a chip from the same chip family.
+Each member of the family contains a different set of cores, but
+shares basic architectural features such as address space definition,
+interrupt and error architecture, and backplane register definitions.
+.Pp
+Each core can have an initiator agent that passes read and write
+requests onto the system backplane and a target agent that returns
+responses to those requests.
+Not all cores contain both an initiator and a target agent.
+Initiator agents are present in cores that contain
+host interfaces (PCI, PCMCIA), embedded processors (MIPS),
+or DMA processors associated with communications cores.
+.Pp
+All cores other than PCMCIA have a target agent.
+.Sh SEE ALSO
+.Xr bwn 4
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Fx 8.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Bruce M. Simpson
+.Aq bms@FreeBSD.org
+and
+.An Weongyo Jeong
+.Aq weongyo@FreeBSD.org .
+.Sh CAVEATS
+Host mode is not supported at this moment.