1.\" $NetBSD: spdmem.4,v 1.6 2014/03/18 18:20:39 riastradh Exp $ 2.\" 3.\"Copyright (c) 2007 Nicolas Joly 4.\"Copyright (c) 2007 Paul Goyette 5.\"All rights reserved. 6.\" 7.\"Redistribution and use in source and binary forms, with or without 8.\"modification, are permitted provided that the following conditions 9.\"are met: 10.\"1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\"2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\"3. The name of the author may not be used to endorse or promote products 16.\" derived from this software without specific prior written permission. 17.\" 18.\"THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS 19.\"``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\"TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\"PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\"BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\"CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\"SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\"INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\"CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\"ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\"POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd August 10, 2007 31.Dt SPDMEM 4 32.Os 33.Sh NAME 34.Nm spdmem 35.Nd Generic Memory Module Serial Presence Detect 36.Sh SYNOPSIS 37.Cd "spdmem* at iic? addr 0x50" 38.Cd "spdmem* at iic? addr 0x51" 39.Cd "spdmem* at iic? addr 0x52" 40.Cd "spdmem* at iic? addr 0x53" 41.Sh DESCRIPTION 42The 43.Nm 44driver provides support for generic memory module Serial Presence Detect. 45During kernel boot it displays module type, and where possible, the size and 46rated speed of the memory module. 47Additional information such as bank configuration and width is 48printed if the kernel is booted in verbose mode. 49.Pp 50The Serial Presence Detect data for each memory module is also made accessible 51to user mode via 52.Xr sysctl 8 . 53An entry for each 54.Nm 55device is created under the 56.Dv hw 57top-level MIB. 58.Sh SEE ALSO 59.Xr iic 4 , 60.Xr intro 4 61.Sh HISTORY 62The 63.Nm 64driver first appeared in 65.Nx 5.0 . 66.Sh AUTHORS 67.An -nosplit 68The 69.Nm 70driver was written by 71.An Nicolas Joly Aq Mt njoly@pasteur.fr 72with additional work by 73.An Paul Goyette Aq Mt paul@whooppee.com . 74