2009-10-19 22:41:07 +04:00
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.\" $NetBSD: cmdide.4,v 1.4 2009/10/19 18:41:08 bouyer Exp $
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2003-10-08 16:02:40 +04:00
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.\"
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.\" Copyright (c) 2003 Manuel Bouyer.
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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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.\"
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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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2003-12-14 04:00:20 +03:00
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.Dd December 13, 2003
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2003-10-08 16:02:40 +04:00
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.Dt CMDIDE 4
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.Os
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.Sh NAME
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.Nm cmdide
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.Nd CMD Technology and Silicon Image IDE disk controllers driver
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.Sh SYNOPSIS
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.Cd "cmdide* at pci? dev ? function ? flags 0x0000"
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.Cd "options PCIIDE_CMD064x_DISABLE"
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.Cd "options PCIIDE_CMD0646U_ENABLEUDMA"
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.Sh DESCRIPTION
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The
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.Nm
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driver supports the CMD Technology PCI0640, PCI0643, PCI0646, PCI0648, PCI0649,
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2003-12-14 04:00:20 +03:00
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and Silicon Image 0680 IDE controllers, and provides the interface with the
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hardware for the
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2003-10-08 17:39:11 +04:00
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.Xr ata 4
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2003-10-08 16:02:40 +04:00
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driver.
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.Pp
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The 0x0002 flag forces the
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.Nm
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driver to disable DMA on chipsets for which DMA would normally be
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enabled.
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This can be used as a debugging aid, or to work around
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problems where the IDE controller is wired up to the system incorrectly.
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.Sh SEE ALSO
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.Xr ata 4 ,
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.Xr atapi 4 ,
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2003-10-08 17:39:11 +04:00
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.Xr intro 4 ,
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.Xr pci 4 ,
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.Xr pciide 4 ,
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2003-10-08 17:39:11 +04:00
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.Xr wd 4 ,
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2003-10-08 16:02:40 +04:00
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.Xr wdc 4
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.Sh BUGS
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There's no way to reliably know if a PCI064x controller is enabled or not.
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If the driver finds a PCI064x, it will assume it is enabled unless the
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PCIIDE_CMD064x_DISABLE option is specified in the kernel config file.
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This will be a problem only if the controller has been disabled in the BIOS
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and another controller has been installed and uses the ISA legacy I/O ports
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and interrupts.
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.Pp
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The PCI0646U controller is known to be buggy with Ultra-DMA transfers, so
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Ultra-DMA is disabled by default for this controller.
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To enable Ultra-DMA, use the PCIIDE_CMD0646U_ENABLEUDMA option.
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Ultra-DMA can eventually be disabled on a per-drive basis with config
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flags, see
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.Xr wd 4 .
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.Pp
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The timings used for the PIO and DMA modes for controllers listed above
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are for a PCI bus running at 30 or 33 MHz.
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This driver may not work properly on overclocked systems.
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