1.\" $NetBSD: spdmem.4,v 1.8 2016/07/27 08:38:25 wiz 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 July 27, 2016 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.Cd "spdmem* at iic? addr 0x54" 42.Cd "spdmem* at iic? addr 0x55" 43.Cd "spdmem* at iic? addr 0x56" 44.Cd "spdmem* at iic? addr 0x57" 45.Sh DESCRIPTION 46The 47.Nm 48driver provides support for generic memory module Serial Presence Detect. 49During kernel boot it displays module type, and where possible, the size and 50rated speed of the memory module. 51Additional information such as bank configuration and width is 52printed if the kernel is booted in verbose mode. 53.Pp 54The Serial Presence Detect data for each memory module is also made accessible 55to user mode via 56.Xr sysctl 8 . 57An entry for each 58.Nm 59device is created under the 60.Dv hw 61top-level MIB. 62.Pp 63Some SPD ROMs also have a temperature sensor. 64It's supported by 65.Xr sdtemp 4 . 66.Sh SEE ALSO 67.Xr iic 4 , 68.Xr intro 4 , 69.Xr sdtemp 4 70.Sh HISTORY 71The 72.Nm 73driver first appeared in 74.Nx 5.0 . 75.Sh AUTHORS 76.An -nosplit 77The 78.Nm 79driver was written by 80.An Nicolas Joly Aq Mt njoly@pasteur.fr 81with additional work by 82.An Paul Goyette Aq Mt paul@whooppee.com . 83