Date: Sat, 13 Feb 2010 00:30:50 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r203807 - stable/8/share/man/man4 Message-ID: <201002130030.o1D0UopM074410@svn.freebsd.org>
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Author: delphij Date: Sat Feb 13 00:30:50 2010 New Revision: 203807 URL: http://svn.freebsd.org/changeset/base/203807 Log: MFC r203053: Add a manual page for nvram(4). Added: stable/8/share/man/man4/nvram.4 - copied unchanged from r203053, head/share/man/man4/nvram.4 Modified: stable/8/share/man/man4/Makefile Directory Properties: stable/8/share/man/man4/ (props changed) Modified: stable/8/share/man/man4/Makefile ============================================================================== --- stable/8/share/man/man4/Makefile Sat Feb 13 00:29:01 2010 (r203806) +++ stable/8/share/man/man4/Makefile Sat Feb 13 00:30:50 2010 (r203807) @@ -290,6 +290,7 @@ MAN= aac.4 \ nsp.4 \ null.4 \ ${_nve.4} \ + ${_nvram.4} \ ${_nxge.4} \ ohci.4 \ orm.4 \ @@ -638,6 +639,7 @@ _ndis.4= ndis.4 _nfe.4= nfe.4 _nfsmb.4= nfsmb.4 _nve.4= nve.4 +_nvram.4= nvram.4 _nxge.4= nxge.4 _rr232x.4= rr232x.4 _speaker.4= speaker.4 Copied: stable/8/share/man/man4/nvram.4 (from r203053, head/share/man/man4/nvram.4) ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ stable/8/share/man/man4/nvram.4 Sat Feb 13 00:30:50 2010 (r203807, copy of r203053, head/share/man/man4/nvram.4) @@ -0,0 +1,93 @@ +.\" +.\"Copyright (c) 2010 iXsystems, Inc. +.\"All rights reserved. +.\" written by: Xin LI <delphij@FreeBSD.org> +.\" +.\"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. +.\" +.\"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 AUTHOR 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. +.\" +.\" $FreeBSD$ +.\" +.Dd January 27, 2010 +.Dt NVRAM 4 i386 +.Os +.Sh NAME +.Nm nvram +.Nd "non-volatile RAM" +.Sh SYNOPSIS +To compile this driver into the kernel, +place the following line in your +kernel configuration file: +.Bd -ragged -offset indent +.Cd "device nvram" +.Ed +.Pp +Alternatively, to load the driver as a +module at boot time, place the following line in +.Xr loader.conf 5 : +.Bd -literal -offset indent +nvram_load="YES" +.Ed +.Sh DESCRIPTION +The +.Nm +driver provides access to BIOS configuration NVRAM on i386 and amd64 +systems. +.Pp +PC motherboard uses a small non-volatile memory to store BIOS settings +which is usually part of its clock chip and sometimes referred as +.Dq CMOS SRAM . +This driver exposes bytes 14 through 128 of the NVRAM, or a total of +114 bytes, at offset zero of the device file +.Pa /dev/nvram . +.Pp +This driver is useful for cloning machines that shares the same hardware +configuration and need same BIOS setting tweaks. +.Sh IMPLEMENTATION NOTES +The BIOS NVRAM's bytes 16 through 31 are checksummed at byte 32. +This driver +.Em does not +take care for these checksums. +.Sh EXAMPLES +Backup existing BIOS NVRAM to +.Pa nvram.bin : +.Pp +.Dl dd if=/dev/nvram of=nvram.bin +.Pp +Restore BIOS NVRAM from +.Pa nvram.bin : +.Pp +.Dl dd if=nvram.bin of=/dev/nvram +.Sh SEE ALSO +.Xr dd 1 +.Sh HISTORY +The +.Nm +device driver first appeared in +.Fx 6.4 . +.Sh AUTHORS +.An -nosplit +The +.Nm +device driver was written by +.An Peter Wemm . +This manual page was written by +.An Xin LI .
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