1.\" $OpenBSD: spdmem.4,v 1.8 2021/05/01 16:11:09 visa 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: May 1 2021 $ 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.Sh DESCRIPTION 29The 30.Nm 31driver retrieves information about memory modules from an 32onboard EEPROM, standardised as JEDEC 21-C. 33Currently 34.Nm 35is able to decode information relating to SDRAM and DDR/DDR2/DDR3 SDRAM. 36.Sh SEE ALSO 37.Xr iic 4 38.Sh HISTORY 39The 40.Nm 41device driver first appeared in 42.Ox 4.3 . 43.Sh AUTHORS 44.An -nosplit 45The 46.Nm 47driver was written by 48.An Nicolas Joly , 49.An Paul Goyette , 50and 51.An Tobias Nygren 52and ported to 53.Ox 54by 55.An Jonathan Gray Aq Mt jsg@openbsd.org . 56