xref: /freebsd/share/man/man4/mmc.4 (revision efe014e6b177ba1b0d70f7df751f5066d4eafe9b)
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2.\" Copyright (c) 2007 M. Warner Losh <imp@FreeBSD.org>
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24.\" $FreeBSD$
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26.Dd June 10, 2021
27.Dt MMC 4
28.Os
29.Sh NAME
30.Nm mmc
31.Nd MultiMediaCard and SD Card bus driver
32.Sh SYNOPSIS
33.Cd device mmc
34.Sh DESCRIPTION
35The
36.Nm
37driver implements the MMC and SD Card bus.
38The
39.Nm
40driver supports all MMC and SD bridges in the system.
41All SD or MMC cards in the system attach to an instance of
42.Nm .
43The
44.Nm
45bus typically has only one slot, and only memory cards.
46MultiMediaCards exist only in memory.
47SD Cards exist as memory, I/O, or combination cards.
48.Sh SEE ALSO
49.Xr mmcsd 4 ,
50.Xr sdhci 4
51.Rs
52.%T "SD Specifications, Part 1, Physical Layer, Simplified Specification"
53.Re
54.Rs
55.%T "The MultiMediaCard System Specification"
56.Re
57.Sh BUGS
58SDIO cards currently do not work.
59