116 lines
4.0 KiB
Groff
116 lines
4.0 KiB
Groff
.\" $NetBSD: ncr.4,v 1.8 1999/07/16 20:26:57 hwr Exp $
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.\"
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.\" Copyright (c) 1994 James A. Jegers
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.\" All rights reserved.
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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. 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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.\"
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.Dd January 15, 1997
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.Dt NCR 4
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.Os
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.Sh NAME
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.Nm ncr
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.Nd NCR 53C8xx SCSI driver
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.Sh SYNOPSIS
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.Cd "ncr* at pci? dev ? function ?"
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.Cd "scsibus* at ncr?"
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.Pp
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.Cd "options FAILSAFE"
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.Cd "options NCR_CDROM_ASYNC"
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.Cd "options NCR_IOMAPPED"
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.Cd "options NCR_TEKRAM_EEPROM"
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.Cd "options SCSI_NCR_DFLT_TAGS=integer"
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.Cd "options SCSI_NCR_MAX_SYNC=integer"
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.Cd "options SCSI_NCR_MAX_WIDE=integer"
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.Cd "options SCSI_NCR_SYMBIOS_COMPAT"
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.Cd "options SCSI_NCR_TRUST_BIOS"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the NCR (Symbios) 53C810, 53C815, 53C820,
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53C825, 53C860, 53C875, 53C885, 53C895, and 53C896
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.Tn SCSI
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controller chips.
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.Pp
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The following kernel configuration options are available:
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.Bl -ohang
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.It Cd options FAILSAFE
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Disables tagged command queuing and forces asynchronous transfers for
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.Tn CD-ROM
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devices.
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.It Cd options NCR_CDROM_ASYNC
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Always use asynchronous transfers with
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.Tn CD-ROM
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devices.
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By default, synchronous transfers are used if the
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.Tn CD-ROM
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supports it.
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.It Cd options NCR_IOMAPPED
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Attempt to access the controller chip via I/O port-mapped I/O, falling back
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to memory-mapped I/O if the I/O ports couldn't be mapped.
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By default, memory-mapped I/O is tried first.
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.It Cd options NCR_TEKRAM_EEPROM
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Enables support for reading the configuration
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.Tn EEPROM
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of the Tekram DC-390 series of
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.Tn SCSI
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cards.
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Enable this only if using a Tekram DC-390 card.
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.It Cd options SCSI_NCR_DFLT_TAGS=integer
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Specifies the maximum number of tags per logical unit.
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Unless
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.Dv FAILSAFE
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is defined, the default value is 4.
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A value of 0 will disable tagged command queuing.
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.It Cd options SCSI_NCR_MAX_SYNC=integer
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Specifies the maximum synchronous transfer frequency to use, in kHz.
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A value of 0 means asynchronous transfers only.
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The default is 20000 (20MHz), unless the controller chip only
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supports fast transfers, in which case it's 10000 (10MHz).
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.It Cd options SCSI_NCR_MAX_WIDE=integer
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Specifies the maximum
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.Tn SCSI
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bus width, with 0 meaning 8 bits and 1 meaning 16 bits.
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Defaults to 1 on chips that support wide
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.Tn SCSI ,
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0 otherwise.
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Set this to 0 to disable wide transfers even if both controller
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and device support them (e.g. when using a wide controller and wide
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drive through a narrow cable).
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.It Cd options SCSI_NCR_SYMBIOS_COMPAT
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Enables the use of the GPIO register as a disk activity indicator.
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Enable this if the activity LED isn't working, but make sure the
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card doesn't use GPIO for something else.
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Cards known to support this:
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ASUS SC875, Diamond FirePort 40, and Symbios SYM8751S.
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.It Cd options SCSI_NCR_TRUST_BIOS
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Specifies that the driver should use the register configuration set by the
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firmware instead of configuring the chip itself.
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.El
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.Sh SEE ALSO
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.Xr intro 4 ,
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.Xr scsi 4 ,
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.Xr sd 4 ,
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.Xr st 4 ,
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.Xr cd 4 ,
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.Xr ch 4 ,
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.Xr uk 4
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