105 lines
3.8 KiB
Groff
105 lines
3.8 KiB
Groff
.\"
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.\" Copyright (c) 1994 Wilko Bulte
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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. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software withough 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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.\" $Id: wd.4,v 1.9 1998/06/08 06:11:59 jkoshy Exp $
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.\"
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.Dd August 31, 1994
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.Dt WD 4 i386
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.Os FreeBSD
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.Sh NAME
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.Nm wd
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.Nd
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Generic WD100x/IDE diskcontroller driver
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.Sh SYNOPSIS
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.Cd "controller wdc0 at isa? port" \&"IO_WD1\&" bio irq 14
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.Cd "disk wd0 at wdc0 drive 0
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.Cd "disk wd1 at wdc0 drive 1
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.Pp
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For the CMD640b IDE controller:
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.Cd "options" \&"CMD640\&"
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.Sh DESCRIPTION
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This driver provides access to disks connected to controllers that emulate
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the Western Digital WD100x series. This range of controllers includes WD1003
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type ST412 controllers, WD1007 ESDI controllers and also the generic IDE
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controllers found on most motherboards.
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.Pp
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Your controller documentation is usually quick to point out any WD100x
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compatibility.
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.Pp
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You can convey a number of hints and instructions to the driver using
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the
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.Ar flags
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parameter.
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.Pp
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For each drive there are four bit-fields encoded in a 16 bit integer:
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.Bl -tag -width 0x0000 -offset 1c
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.It 0x8000
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Test and use the 32bit transfer capability of the drive.
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.It 0x4000
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If drive looks like it's coming out of sleep mode, assume it's
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confused and reinitialize it.
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.It 0x2000
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Probe for and use the bus-mastering DMA capabilities of modern
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PCI chipsets.
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.It 0x1000
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Use LBA addressing instead of the default CHS addressing.
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.It 0x0f00
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Force number of heads to ((flags & 0xf00)>>8), recalculate number
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of cylinders to match.
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.It 0x00ff
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Test and use multi-sector transfer mode of this drive, max number of
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sectors attempted is (flags & 0x00ff).
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.El
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.Pp
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The flags can be specified on the line for the drive as a 16 bit int,
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or on the controller line as a 32 bit int, where the top 16 bit is
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relevant to the highest numbered drive.
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.Pp
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The
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.Dq Dv CMD640
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configuration option
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enables a workaround for a deficiency of the CMD640b IDE controller.
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If this option is enabled and the chip is detected by the PCI subsystem,
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the primary and secondary controller will not be used simultaneously.
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /dev/wd*
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disk block device nodes
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.It Pa /dev/rwd*
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disk character device nodes
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.It Pa /sys/i386/conf/GENERIC
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sample generic kernel config file for (a.o.) wd based systems
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.It Pa /sys/i386/isa/wd.c
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driver source
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.El
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.Sh SEE ALSO
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.Xr bad144 8
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.Sh NOTES
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This controller/disk combo has no provisions for automatic bad block handling.
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You need to run
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.Xr bad144 8
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to check for bad blocks.
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