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+.\"	$OpenBSD: nvram.4,v 1.1 2007/08/02 16:40:27 deraadt Exp $
+.\"
+.\" Copyright 2004 Joshua Stein <jcs@openbsd.org>
+.\" All rights reserved.
+.\"
+.\" 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 ``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 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.
+.\"
+.Dd $Mdocdate: August 2 2007 $
+.Dt NVRAM 4 amd64
+.Os
+.Sh NAME
+.Nm nvram
+.Nd driver for reading PC NVRAM contents
+.Sh SYNOPSIS
+.Cd "pseudo-device nvram 1"
+.Sh DESCRIPTION
+The
+.Nm
+device provides read-only access to the non-volatile memory contained in the
+MC146818 real-time clock.
+.Pp
+This data is provided as a seekable character device,
+.Pa /dev/nvram .
+Checksums of the NVRAM contents are calculated over bytes 2 to 31 and stored
+in byte 32.
+A valid checksum is required for the driver to initialize.
+.Sh FILES
+.Bl -tag -width /dev/nvram
+.It Pa /dev/nvram
+.El
+.Sh HISTORY
+.Nm
+support was originally included in
+.Ox 3.7 .