97 lines
3.9 KiB
Groff
97 lines
3.9 KiB
Groff
.\" $NetBSD: ncr.4,v 1.4 1998/03/11 09:55:19 fair 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 NetBSD
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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 SCSI 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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CDROM devices.
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.It Cd options NCR_CDROM_ASYNC
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Always use asynchronous transfers with CDROM devices. By default,
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synchronous transfers are used if the CDROM 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. By default,
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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 EEPROM of the Tekram DC-390
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series of SCSI cards. 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. Unless
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.Dv FAILSAFE
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is defined, the default value is 4. A value of 0 will disable tagged
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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. A
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value of 0 means asynchronous transfers only. The default is 20000 (20MHz),
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unless the controller chip only supports fast transfers, in which case it's
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10000 (10MHz).
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.It Cd options SCSI_NCR_MAX_WIDE=integer
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Specifies the maximum SCSI bus width, in bytes. Defaults to 1 on chips
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that support wide SCSI, 0 otherwise. Set this to 0 to disable wide transfers
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even if both controller and device support them (e.g. when using a wide
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controller and wide 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. Enable
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this if the activity LED isn't working, but make sure the card doesn't
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use GPIO for something else. 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 letting 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 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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