1.\" $OpenBSD: spdmem.4,v 1.7 2013/07/16 16:05:49 schwarze Exp $ 2.\" 3.\" Copyright (c) 2007 Jonathan Gray <jsg@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: July 16 2013 $ 18.Dt SPDMEM 4 19.Os 20.Sh NAME 21.Nm spdmem 22.Nd Serial Presence Detect memory 23.Sh SYNOPSIS 24.Cd "spdmem* at iic?" 25.Pp 26.Cd "# macppc" 27.Cd "spdmem* at mem?" 28.Pp 29.Cd "# sgi" 30.Cd "spdmem* at mainbus?" 31.Sh DESCRIPTION 32The 33.Nm 34driver retrieves information about memory modules from an 35onboard EEPROM, standardised as JEDEC 21-C. 36Currently 37.Nm 38is able to decode information relating to SDRAM and DDR/DDR2/DDR3 SDRAM. 39.Sh SEE ALSO 40.Xr iic 4 41.Sh HISTORY 42The 43.Nm 44device driver first appeared in 45.Ox 4.3 . 46.Sh AUTHORS 47.An -nosplit 48The 49.Nm 50driver was written by 51.An Nicolas Joly , 52.An Paul Goyette , 53and 54.An Tobias Nygren 55and ported to 56.Ox 57by 58.An Jonathan Gray Aq Mt jsg@openbsd.org . 59