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+.\"	$NetBSD: cmdide.4,v 1.4 2009/10/19 18:41:08 bouyer Exp $
+.\"
+.\" Copyright (c) 2003 Manuel Bouyer.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd December 13, 2003
+.Dt CMDIDE 4
+.Os
+.Sh NAME
+.Nm cmdide
+.Nd CMD Technology and Silicon Image IDE disk controllers driver
+.Sh SYNOPSIS
+.Cd "cmdide* at pci? dev ? function ? flags 0x0000"
+.Cd "options PCIIDE_CMD064x_DISABLE"
+.Cd "options PCIIDE_CMD0646U_ENABLEUDMA"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports the CMD Technology PCI0640, PCI0643, PCI0646, PCI0648, PCI0649,
+and Silicon Image 0680 IDE controllers, and provides the interface with the
+hardware for the
+.Xr ata 4
+driver.
+.Pp
+The 0x0002 flag forces the
+.Nm
+driver to disable DMA on chipsets for which DMA would normally be
+enabled.
+This can be used as a debugging aid, or to work around
+problems where the IDE controller is wired up to the system incorrectly.
+.Sh SEE ALSO
+.Xr ata 4 ,
+.Xr atapi 4 ,
+.Xr intro 4 ,
+.Xr pci 4 ,
+.Xr pciide 4 ,
+.Xr wd 4 ,
+.Xr wdc 4
+.Sh BUGS
+There's no way to reliably know if a PCI064x controller is enabled or not.
+If the driver finds a PCI064x, it will assume it is enabled unless the
+PCIIDE_CMD064x_DISABLE option is specified in the kernel config file.
+This will be a problem only if the controller has been disabled in the BIOS
+and another controller has been installed and uses the ISA legacy I/O ports
+and interrupts.
+.Pp
+The PCI0646U controller is known to be buggy with Ultra-DMA transfers, so
+Ultra-DMA is disabled by default for this controller.
+To enable Ultra-DMA, use the PCIIDE_CMD0646U_ENABLEUDMA option.
+Ultra-DMA can eventually be disabled on a per-drive basis with config
+flags, see
+.Xr wd 4 .
+.Pp
+The timings used for the PIO and DMA modes for controllers listed above
+are for a PCI bus running at 30 or 33 MHz.
+This driver may not work properly on overclocked systems.