.\"	$OpenBSD: wdc.4,v 1.8 2002/12/31 16:22:26 miod Exp $
.\"	$NetBSD: wdc.4,v 1.4 1999/05/19 14:44:02 bouyer Exp $
.\"
.\" Copyright (c) 1998 Manuel Bouyer.
.\"
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.\"	This product includes software developed by the University of
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.Dd October 15, 1998
.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?"
.Cd "wdc* at pcmcia? function ?"
.Pp
.Cd "# macppc"
.Cd "wdc* at macobio? flags 0x01"
.Pp
.Cd "atapiscsi* at wdc?* channel ? flags 0x0000"
.Cd "wd* at wdc? drive ? 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 ISA 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 pciide 4 ,
.Xr pcmcia 4 ,
.Xr scsi 4 ,
.Xr wd 4