58 lines
2.3 KiB
Groff
58 lines
2.3 KiB
Groff
.\" $NetBSD: wd.4,v 1.5 1999/12/11 23:10:15 augustss Exp $
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.\"
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.\"
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.\" Copyright (c) 1994 James A. Jegers
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 15, 1998
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.Dt WD 4
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.Os
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.Sh NAME
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.Nm wd
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.Nd WD100x compatible hard disk driver
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.Sh SYNOPSIS
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.Cd "wd* at wdc? channel ? drive ? flags 0x0000"
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.Cd "wd* at pciide? channel ? drive ? flags 0x0000"
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.Sh DESCRIPTION
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The
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.Nm wd
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driver supports hard disk which emulate the Western
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Digital WD100x. This includes standard MFM, RLL, ESDI, IDE and EIDE
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drives.
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.Pp
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The flags are used only with controllers that support DMA operations and
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mode settings (like some pciide controllers).
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The lowest order nibble (rightmost digit) of the flags define the PIO mode
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to use, the next set of four bits the DMA mode and the third nibble the
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UltraDMA mode.
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For each set of four bits, the 3 lower bits define the mode to use
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and the last bit must be set to 1 for this setting to be used.
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For DMA and UDMA, 0xf (1111) means 'disable'.
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For example, a flags value of 0x0fac (1111 1010 1100)
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means 'use PIO mode 4, DMA mode 2, disable UltraDMA'.
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0x0000 means "use whatever the drive claims to support.
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.Sh SEE ALSO
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.Xr intro 4 ,
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.Xr pciide 4 ,
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.Xr scsi 4 ,
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.Xr wdc 4 .
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