.\"	$OpenBSD: wdc.4,v 1.16 2007/05/31 19:19:53 jmc Exp $
.\"	$NetBSD: wdc.4,v 1.4 1999/05/19 14:44:02 bouyer Exp $
.\"
.\" Copyright (c) 1998 Manuel Bouyer.
.\"
.\" 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
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" SUCH DAMAGE.
.\"
.Dd $Mdocdate: May 31 2007 $
.Dt WDC 4
.Os
.Sh NAME
.Nm wdc
.Nd WD100x compatible hard disk controller driver
.Sh SYNOPSIS
.Cd "# alpha/i386"
.Cd "wdc0 at isa? port 0x1f0 irq 14 flags 0x00"
.Cd "wdc1 at isa? port 0x170 irq 15 flags 0x00"
.Cd "wdc* at isapnp?"
.Pp
.Cd "# macppc"
.Cd "wdc* at macobio?"
.Cd "wdc* at kauaiata?"
.Pp
.Cd "# landisk"
.Cd wdc0 at obio? port 0x14000000 irq 10
.Pp
.Cd "# all architectures"
.Cd "wdc* at pcmcia?"
.Pp
.Cd "atapiscsi* at wdc?* flags 0x0000"
.Cd "wd* at wdc? flags 0x0000"
.Sh DESCRIPTION
The
.Nm
driver provides the basic functions for the
.Xr wd 4
and
.Xr atapiscsi 4
drivers.
It supports IDE and EIDE controllers, as well as MFM, RLL, and ESDI on
the ISA bus.
PCI IDE controllers in legacy mode are also supported, but the
.Xr pciide 4
driver may provide more functionality.
.Pp
For the
.Xr isa 4
front-end, setting
.Cm flags
to 0x01 enables 32-bit I/O negotiation.
This is known to cause problems with some motherboards.
.Sh SEE ALSO
.Xr atapiscsi 4 ,
.Xr intro 4 ,
.Xr isa 4 ,
.Xr isapnp 4 ,
.Xr macobio 4 ,
.Xr obio 4 ,
.Xr pciide 4 ,
.Xr pcmcia 4 ,
.Xr scsi 4 ,
.Xr wd 4