1.\" $NetBSD: wd.4,v 1.7 2001/06/05 12:20:57 wiz Exp $ 2.\" 3.\" 4.\" Copyright (c) 1994 James A. Jegers 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. The name of the author may not be used to endorse or promote products 13.\" derived from this software without specific prior written permission 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd October 15, 1998 27.Dt WD 4 28.Os 29.Sh NAME 30.Nm wd 31.Nd WD100x compatible hard disk driver 32.Sh SYNOPSIS 33.Cd "wd* at wdc? channel ? drive ? flags 0x0000" 34.Cd "wd* at pciide? channel ? drive ? flags 0x0000" 35.Sh DESCRIPTION 36The 37.Nm wd 38driver supports hard disk which emulate the Western 39Digital WD100x. This includes standard MFM, RLL, ESDI, IDE and EIDE 40drives. 41.Pp 42The flags are used only with controllers that support DMA operations and 43mode settings (like some pciide controllers). 44The lowest order nibble (rightmost digit) of the flags define the PIO mode 45to use, the next set of four bits the DMA mode and the third nibble the 46UltraDMA mode. 47For each set of four bits, the 3 lower bits define the mode to use 48and the last bit must be set to 1 for this setting to be used. 49For DMA and UDMA, 0xf (1111) means 'disable'. 50For example, a flags value of 0x0fac (1111 1010 1100) 51means 'use PIO mode 4, DMA mode 2, disable UltraDMA'. 520x0000 means "use whatever the drive claims to support. 53.Sh SEE ALSO 54.Xr intro 4 , 55.Xr pciide 4 , 56.Xr scsi 4 , 57.Xr wdc 4 58