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+.\"	$NetBSD: rl.4,v 1.1 2000/04/22 17:40:28 ragge Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     from: @(#)hk.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd April 22, 2000
+.Dt RL 4 vax
+.Os
+.Sh NAME
+.Nm rl
+.Nd
+.Tn RL11 Ns / Tn RL01
+and
+.Tn RL02
+disk interface
+.Sh SYNOPSIS
+.Cd "rlc0 at uba? csr 0177440"
+.Cd "rl0 at rlc0 drive 0"
+.Cd "rl* at rlc? drive ?"
+.Sh DESCRIPTION
+The
+.Nm rl
+driver
+is a typical block-device disk driver; block device
+.Tn I/O
+is
+described in
+.Xr physio 4 .
+.Pp
+The script
+.Xr MAKEDEV 8
+should be used to create the special files; if a special file
+needs to be created by hand consult
+.Xr mknod 8 .
+.Sh FILES
+.Bl -tag -width /dev/rrl[0-7][a-h] -compact
+.It Pa /dev/rl[0-7][a-h]
+block files
+.It Pa /dev/rrl[0-7][a-h]
+raw files
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "rl%d: operation incomplete"
+The current command to the disk did not complete within the timeout period.
+This may be due to hardware failure or a heavily loaded Unibus.
+.It "rl%d: read data CRC"
+The controller detected a CRC error on data read from the disk. Probably
+a bad disk pack.
+.It "rl%d: header CRC"
+The controller detected a CRC error on header data read from the disk.
+Probably a bad disk pack.
+.It "rl%d: data late"
+The controller was not able to transfer data over the bus fast enough to
+not overflow/underflow the internal FIFO, probably because a heavily
+loaded Unibus or mis-ordered Unibus devices.
+.It "rl%d: header not found"
+The requested sector was not found before the timer expired. If this error
+is the only error then it may indicate a software bug.
+.It "rl%d: non-existant memory"
+The controller tried to do DMA to/from a non-mapped address. This is a
+software bug.
+.It "rl%d: memory parity error"
+The host memory data sent had a parity error. This is a hardware failure.
+.Sh SEE ALSO
+.Xr hp 4 ,
+.Xr uda 4 ,
+.Xr up 4 ,
+.Xr syslogd 8
+.Sh HISTORY
+The
+.Nm
+driver has been around nearly forever.
+.br
+A complete new
+.Nm
+driver showed up in
+.Nx 1.5 .
+.Sh BUGS
+Error handling is less than optimal.
+.Pp
+Seeks should be interleaved between multiple disks.