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+.\"	$OpenBSD: presto.4,v 1.1 2003/04/13 23:15:46 miod Exp $
+.\" Copyright (c) 2003, Miodrag Vallat
+.\" 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 April 13, 2003
+.Dt PRESTO 4 sparc
+.Os
+.Sh NAME
+.Nm presto
+.Nd Prestoserve battery-backed memory
+.Sh SYNOPSIS
+.Cd presto* at sbus? slot ? offset ?
+.Sh DESCRIPTION
+The
+.Tn Legato
+Prestoserve NVRAM cards
+used to be part of the
+.Dq NFS accelerator
+product, which used the cards memory as an NFS-dedicated cache, increasing
+performance of NFS servers exporting filesystem as NFS protocol, version 2.
+.Pp
+The
+.Nm
+driver does not attempt to achieve such a behaviour, which is questionable
+with the advent of NFS protocol, version 3.
+.Pp
+Instead, it will provide direct access to the NVRAM, as a block device.
+.Sh FILES
+.Bl -tag -width /dev/rprestoXXXXX -compact
+.It Pa /dev/presto Ns Ar u Ns Ar p
+block mode Prestoserve card number
+.Ar u ,
+partition
+.Ar p
+.It Pa /dev/rpresto Ns Ar u Ns Ar p
+raw mode Prestoserve card number
+.Ar u ,
+partition
+.Ar p
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr disklabel 5 ,
+.Xr MAKEDEV 8 ,
+.Xr disklabel 8
+.Sh BUGS
+The NVSIMM flavour, designed for SPARCstation models 10 and 20, is not
+supported yet.