115 lines
4.5 KiB
Groff
115 lines
4.5 KiB
Groff
.\" $NetBSD: pciide.4,v 1.22 2000/07/07 09:53:28 bouyer Exp $
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.\"
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.\" Copyright (c) 1998 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 the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" 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 15, 1998
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.Dt PCIIDE 4
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.Os
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.Sh NAME
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.Nm PCIIDE
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.Nd PCI IDE disk controllers driver
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.Sh SYNOPSIS
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.Cd "pciide* at pci? dev ? function ? flags 0x0000"
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.Cd "pciide* at pnpbios? index ?"
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.Cd "options PCIIDE_CMD064x_DISABLE"
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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 pciide
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driver supports the PCI IDE controllers as specified in the
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"PCI IDE controller specification, revision 1.0" draft, and provides the core
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functions for the
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.Nm wd
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and
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.Nm atapi
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drivers. This driver include specific, enhanced support for the CMD Tech
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PCI0640 controller, and IDE DMA/Ultra-DMA support for the following
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controllers:
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.Bl -dash -compact -offset indent
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.It
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Acer labs M5229 IDE Controller
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.It
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Advanced Micro Devices AMD-756 IDE Controllers
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.It
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CMD Tech PCI0643, PCI0646, PCI0648 and PCI0649 IDE Controllers
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.It
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Contaq Microsystems/Cypress CY82C693 IDE Controller
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.It
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HighPoint HPT366 Ultra/66 IDE controller
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.It
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Intel PIIX, PIIX3 and PIIX4 IDE Controllers
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.It
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Intel 82801 (ICH/ICH0) IDE Controllers
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.It
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OPTi 82c621 (plus a few of its derivatives) IDE Controllers
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.It
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Promise PDC20246 (Ultra/33), PDC20262 (Ultra/66), and Ultra100 (in Ultra/66
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mode only) PCI IDE controllers
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.It
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Silicon Integrated System 5597/5598 IDE controller
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.It
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VIA Technologies VT82C586 and VT82C586A IDE Controllers
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.El
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Some of these controllers are only available in multifunction PCI chips.
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.Pp
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The 0x0001 flag forces the
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.Nm
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driver to use DMA when there is no explicit DMA mode setting support for
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the controller but DMA is present. If the BIOS didn't set up the controller
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properly, this can cause a machine hang.
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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 AMD756 chip revision D2 has a bug affecting DMA (but not Ultra-DMA)
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modes. The workaround documented by AMD is to not use DMA on any drive which
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does not support Ultra-DMA modes. This does not appear to be necessary on all
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drives, the PCIIDE_AMD756_ENABLEDMA option can be used to force multiword DMA
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on the buggy revisions. Multiword DMA eventually be disabled on a per-drive
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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 (except the OPTi controller,
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which supports both 25 and 33 Mhz PCI bus timings). This driver may not
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work properly on overclocked systems.
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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 pnpbios 4 ,
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.Xr scsi 4 ,
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.Xr wd 4 ,
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.Xr wdc 4
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