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+.\"
+.\" Copyright (c) 2007 M. Warner Losh
+.\" 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. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" 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 October 8, 2008
+.Dt MMC 4
+.Os
+.Sh NAME
+.Nm mmc
+.Nd MultiMediaCard and SD Card bus driver
+.Sh SYNOPSIS
+.Cd device mmc
+.Sh DESCRIPTION
+The
+.Nm
+driver implements the MMC and SD Card bus.
+The
+.Nm
+driver supports all MMC and SD bridges in the system.
+All SD or MMC cards in the system attach to an instance of
+.Nm .
+The
+.Nm
+bus typically has only one slot, and only memory cards.
+MultiMediaCards exist only in memory.
+SD Cards exist as memory, I/O, or combination cards.
+.Sh SEE ALSO
+.Xr mmcsd 4 ,
+.Xr at91_mci 4 ,
+.Xr sdhci 4
+.Rs
+.%T "SD Specifications, Part 1, Physical Layer, Simplified Specification"
+.Re
+.Rs
+.%T "The MultiMediaCard System Specification"
+.Re
+.Sh BUGS
+SDIO cards currently do not work.