1.\" $NetBSD: cmdide.4,v 1.3 2003/12/14 01:00:20 thorpej Exp $ 2.\" 3.\" Copyright (c) 2003 Manuel Bouyer. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by Manuel Bouyer. 16.\" 4. The name of the author may not be used to endorse or promote products 17.\" derived from this software without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd December 13, 2003 31.Dt CMDIDE 4 32.Os 33.Sh NAME 34.Nm cmdide 35.Nd CMD Technology and Silicon Image IDE disk controllers driver 36.Sh SYNOPSIS 37.Cd "cmdide* at pci? dev ? function ? flags 0x0000" 38.Cd "options PCIIDE_CMD064x_DISABLE" 39.Cd "options PCIIDE_CMD0646U_ENABLEUDMA" 40.Sh DESCRIPTION 41The 42.Nm 43driver supports the CMD Technology PCI0640, PCI0643, PCI0646, PCI0648, PCI0649, 44and Silicon Image 0680 IDE controllers, and provides the interface with the 45hardware for the 46.Xr ata 4 47driver. 48.Pp 49The 0x0002 flag forces the 50.Nm 51driver to disable DMA on chipsets for which DMA would normally be 52enabled. 53This can be used as a debugging aid, or to work around 54problems where the IDE controller is wired up to the system incorrectly. 55.Sh SEE ALSO 56.Xr ata 4 , 57.Xr atapi 4 , 58.Xr intro 4 , 59.Xr pci 4 , 60.Xr pciide 4 , 61.Xr wd 4 , 62.Xr wdc 4 63.Sh BUGS 64There's no way to reliably know if a PCI064x controller is enabled or not. 65If the driver finds a PCI064x, it will assume it is enabled unless the 66PCIIDE_CMD064x_DISABLE option is specified in the kernel config file. 67This will be a problem only if the controller has been disabled in the BIOS 68and another controller has been installed and uses the ISA legacy I/O ports 69and interrupts. 70.Pp 71The PCI0646U controller is known to be buggy with Ultra-DMA transfers, so 72Ultra-DMA is disabled by default for this controller. 73To enable Ultra-DMA, use the PCIIDE_CMD0646U_ENABLEUDMA option. 74Ultra-DMA can eventually be disabled on a per-drive basis with config 75flags, see 76.Xr wd 4 . 77.Pp 78The timings used for the PIO and DMA modes for controllers listed above 79are for a PCI bus running at 30 or 33 MHz. 80This driver may not work properly on overclocked systems. 81