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+.\"	$NetBSD: spdmem.4,v 1.8 2016/07/27 08:38:25 wiz Exp $
+.\"
+.\"Copyright (c) 2007 Nicolas Joly
+.\"Copyright (c) 2007 Paul Goyette
+.\"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.
+.\"3. 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 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 July 27, 2016
+.Dt SPDMEM 4
+.Os
+.Sh NAME
+.Nm spdmem
+.Nd Generic Memory Module Serial Presence Detect
+.Sh SYNOPSIS
+.Cd "spdmem* at iic? addr 0x50"
+.Cd "spdmem* at iic? addr 0x51"
+.Cd "spdmem* at iic? addr 0x52"
+.Cd "spdmem* at iic? addr 0x53"
+.Cd "spdmem* at iic? addr 0x54"
+.Cd "spdmem* at iic? addr 0x55"
+.Cd "spdmem* at iic? addr 0x56"
+.Cd "spdmem* at iic? addr 0x57"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for generic memory module Serial Presence Detect.
+During kernel boot it displays module type, and where possible, the size and
+rated speed of the memory module.
+Additional information such as bank configuration and width is
+printed if the kernel is booted in verbose mode.
+.Pp
+The Serial Presence Detect data for each memory module is also made accessible
+to user mode via
+.Xr sysctl 8 .
+An entry for each
+.Nm
+device is created under the
+.Dv hw
+top-level MIB.
+.Pp
+Some SPD ROMs also have a temperature sensor.
+It's supported by
+.Xr sdtemp 4 .
+.Sh SEE ALSO
+.Xr iic 4 ,
+.Xr intro 4 ,
+.Xr sdtemp 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 5.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Nicolas Joly Aq Mt njoly@pasteur.fr
+with additional work by
+.An Paul Goyette Aq Mt paul@whooppee.com .