86 lines
3.2 KiB
Groff
86 lines
3.2 KiB
Groff
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.\" $NetBSD: viaide.4,v 1.1 2003/10/08 12:02:40 bouyer Exp $
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Manuel Bouyer.
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.\" 4. 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 8, 2003
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.Dt VIAIDE 4
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.Os
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.Sh NAME
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.Nm viaide
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.Nd AMD, NVIDIA and VIA IDE disk controllers driver
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.Sh SYNOPSIS
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.Cd "viaide* at pci? dev ? function ? flags 0x0000"
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.Cd "options PCIIDE_AMD756_ENABLEDMA"
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.Sh DESCRIPTION
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The
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.Nm
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driver supports the following IDE controllers
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and provides the interface with the hardware for the
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.Ic ata
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driver:
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.Bl -dash -compact -offset indent
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.It
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Advanced Micro Devices AMD-756, 766, and 768 IDE Controllers
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.It
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NVIDIA nForce and nForce2
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.It
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VIA Technologies VT82C586, VT82C586A, VT82C596A, VT82C686A, VT8233A,
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VT8235 and VT8237 IDE Controllers
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.El
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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 intro 4 ,
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.Xr pci 4 ,
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.Xr ata 4 ,
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.Xr atapi 4 ,
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.Xr wd 4 ,
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.Xr pciide 4
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.Xr wdc 4
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.Sh BUGS
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The AMD756 chip revision D2 has a bug affecting DMA (but not Ultra-DMA)
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modes.
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The workaround documented by AMD is to not use DMA on any drive which
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does not support Ultra-DMA modes.
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This does not appear to be necessary on all drives, the
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PCIIDE_AMD756_ENABLEDMA option can be used to force multiword DMA
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on the buggy revisions.
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Multiword DMA can eventually be disabled on a
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per-drive basis with config flags, see
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.Xr wd 4 .
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The bug, if triggered, will cause a total system hang.
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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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