.\"   $OpenBSD: rd.4,v 1.4 2007/05/31 19:19:51 jmc Exp $
.\"
.\" This file is in the public domain.
.\"
.Dd $Mdocdate: May 31 2007 $
.Dt RD 4
.Os
.Sh NAME
.Nm rd
.Nd ramdisk driver
.Sh SYNOPSIS
.Cd "pseudo-device rd" Op Ar count
.Sh DESCRIPTION
The
.Nm
driver enables use of system or user memory as a disk.
Memory for the disk must be allocated and initialized inside the
kernel image at build-time using the
.Nm rdsetroot ( Xr a.out 5 )
or
.Nm elfrdsetroot ( Xr elf 5 )
tool.
.Sh FILES
.Bl -tag -width /dev/rrdXX -compact
.It Pa "/dev/rd??"
block mode ramdisk devices.
.It Pa "/dev/rrd??"
raw mode ramdisk devices.
.El
.Sh SEE ALSO
The
.Nm rdsetroot
and
.Nm elfrdsetroot
tools are available as part of the distribution toolset.