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of the typeset output, tend to make diffs harder to read and provide bad examples for new-comers to mdoc.
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.\"
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.\" Device driver optimized for the Symbios/LSI 53C896/53C895A/53C1010
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.\" PCI-SCSI controllers.
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.\"
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.\" Copyright (C) 1999-2000 Gerard Roudier <groudier@club-internet.fr>
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.\"
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.\" This driver also supports the following Symbios/LSI PCI-SCSI chips:
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.\" 53C810A, 53C825A, 53C860, 53C875, 53C876, 53C885, 53C895.
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.\"
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.\" but does not support earlier chips as the following ones:
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.\" 53C810, 53C815, 53C825.
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.\"
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.\" This driver for FreeBSD-CAM is derived from the Linux sym53c8xx driver.
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.\" Copyright (C) 1998-1999 Gerard Roudier
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.\"
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.\" The sym53c8xx driver is derived from the ncr53c8xx driver that had been
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.\" a port of the FreeBSD ncr driver to Linux-1.2.13.
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.\"
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.\" The original ncr driver has been written for 386bsd and FreeBSD by
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.\" Wolfgang Stanglmeier <wolf@cologne.de>
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.\" Stefan Esser <se@mi.Uni-Koeln.de>
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.\" Copyright (C) 1994 Wolfgang Stanglmeier
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.\"
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.\" The initialization code, and part of the code that addresses
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.\" FreeBSD-CAM services is based on the aic7xxx driver for FreeBSD-CAM
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.\" written by Justin T. Gibbs.
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.\"
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.\" Other major contributions:
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.\"
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.\" NVRAM detection and reading.
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.\" Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
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.\"
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.\" ----------------------------------------------------------------------------
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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. 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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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.\" ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 12, 2000
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.Dt SYM 4 i386
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.Os FreeBSD
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.Sh NAME
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.Nm sym
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.Nd Symbios/LSI Logic PCI-SCSI host adapter driver
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.Sh SYNOPSIS
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For any number of cards:
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.Cd device sym
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.Pp
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To disable PCI parity checking (needed for broken bridges)
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.Cd options SYM_SETUP_PCI_PARITY=<boolean>
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.Pp
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To control driver probing against HVD buses
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.Cd options SYM_SETUP_SCSI_DIFF=<bit combination>
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.Pp
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To control chip attachment balancing between the ncr driver and this driver
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.Cd options SYM_SETUP_LP_PROBE_MAP=<bit combination>
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.Sh DESCRIPTION
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This driver provides support for the Symbios/LSI Logic
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.Tn 53C810A,
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.Tn 53C825A,
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.Tn 53C860,
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.Tn 53C875,
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.Tn 53C876,
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.Tn 53C895,
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.Tn 53C895A,
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.Tn 53C896,
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.Tn 53C897,
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.Tn 53C1510D,
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and
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.Tn 53C1010
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PCI-SCSI controllers.
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.Pp
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Driver features include support for wide SCSI busses, fast10, fast20,
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fast40 and fast80-dt synchronous data transfers depending on controller
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capabilities.
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It also provides generic SCSI features as tagged command
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queuing and auto-request sense.
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This driver is configured by default
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for a maximum of 446 outstanding commands per bus, 8 LUNs per target
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and 64 tagged tasks per LUN.
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These numbers are not so limited by design,
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as have been considered reasonable values for current SCSI technology.
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These values can be increased by changing appropriate
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constants in driver header files (not recommended).
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.Pp
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This driver requires the PCI-SCSI chip to implement LOAD/STORE SCRIPTS
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instructions and therefore it does not provide support for 53C810 revid < 16,
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53C825 revid < 16 and all 53C815 revisions.
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The generic
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.Nm ncr
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driver can be used to support these early chips.
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.Pp
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By default, when both the
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.Nm ncr
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and
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.Nm
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drivers are configured, the
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.Nm
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driver takes precedence over the
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.Nm ncr
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driver for all chips that are supported by
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both drivers.
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As result, the
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.Nm ncr
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driver does only attach the 53C8XX
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chips that donnot support LOAD/STORE (i.e.: 53C810, 53C815 and 53C825).
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User can change the balancing of chip types between drivers by defining
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the
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.Ar SYM_SETUP_LP_PROBE_MAP
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kernel configuration option as follows:
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.Bl -column "Bit " "53C8XXA, 53C8XX, 53C8XX, 53C8XX, 53C8XX, 53C8XX"
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.Em Bit Devices attached by ncr instead
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1 53C810a, 53C860
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2 53C825a, 53C875, 53C876, 53C885, 53C895
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4 53C895a, 53C896, 53C897, 53C1510d
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.El
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.Ed
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.Pp
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For example, if
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.Ar SYM_SETUP_LP_PROBE_MAP
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is supplied with value 7, all the
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above chips will be attached by the
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.Nm ncr
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driver and the
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.Nm
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driver will only
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attach the 53C1010 Ultra-3 controllers.
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.Pp
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HVD/LVD capable controllers (895, 895A, 896, 897 and 1010) report
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the actual bus mode from the STEST4 chip IO registers.
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This feature
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allows to safely probe against bus mode and to set up the chip
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accordingly.
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By default the driver only supports HVD for these chips.
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For other chips that can support HVD but not LVD, the driver has to probe
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implementation dependent registers (GPIO) in order to detect HVD bus mode.
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Only HVD implementations that conform with Symbios Logic recommendation can
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be detected by the driver.
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When the
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.Ar SYM_SETUP_SCSI_DIFF
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kernel is provided
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as value 1, the driver will also probe against HVD for 825a, 875, 876 and
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885 chips, assuming Symbios Logic compatible implementation of HVD.
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.Pp
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When supplied as 0, the
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.Ar SYM_SETUP_PCI_PARITY
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kernel configuration option
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indicates the driver not to enable PCI parity checking.
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PCI parity
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checking should not be an option for PCI-SCSI controllers, but some
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systems have been reported to fail using 53C8XX chips due to spurious or
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permanent PCI parity errors detected.
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This option is supplied for
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convenience but it is not recommended nor supported.
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.Pp
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This driver offers other options that are not currently exported to user.
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They are defined and documented in the sym_conf.h driver file.
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It is not
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recommended to change these options unless absolute need.
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Some of these
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options are planned to be exported through SYSCTL or equivalent mechanism
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in a further driver release and therefore, no compatibility is guaranteed.
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.Pp
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At initialization, the driver tries to detect and read user settings from
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controller NVRAM.
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The Symbios/Logic NVRAM layout and the Tekram NVRAM
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layout are currently supported.
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If the reading of the NVRAM succeeds, the
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following settings are taken into account and reported to CAM:
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.Pp
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.Bl -column "SCSI parity checking " "Symbios " "Tekram"
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.Em Host settings Symbios Tekram
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SCSI parity checking Y N
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Host SCSI ident Y Y
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Verbose messages Y N
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Scan targets hi-lo Y N
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Avoid SCSI bus reset Y N
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.Pp
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.El
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.Bl -column "Synchronous period " "Symbios " "Tekram"
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.Em Device settings Symbios Tekram
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Synchronous period Y Y
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SCSI bus width Y Y
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Queue tag enable Y Y
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Number of tags NA Y
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Disconnect enable Y Y
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Scan at boot time Y N
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Scan LUN Y N
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.El
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.Pp
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Devices that are configured as disabled for 'scan' in the NVRAM are not
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reported to CAM at system start-up.
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They can be discovered later using
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the
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.Nm camcontrol rescan
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command.
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.Pp
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The table below summarizes the main features and capabilities of the
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NCR/Symbios/LSI Logic 53C8XX family of PCI-SCSI controllers.
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.Pp
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.Bl -column sym53c1510d "Sync " "Width " "SRAM " "PCI64"
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.Em Chip Sync Width SRAM PCI64 Supported
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sym53c810 10MHz 8Bit N N N
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sym53c810a 10MHz 8Bit N N Y
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sym53c815 10MHz 8Bit N N N
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sym53c825 10MHz 16Bit N N N
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sym53c825a 10MHz 16Bit 4KB N Y
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sym53c860 20MHz 8Bit N N Y
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sym53c875 20MHz 16Bit 4KB N Y
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sym53c876 20MHz 16Bit 4KB N Y
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sym53c885 20MHz 16Bit 4KB N Y
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sym53c895 40MHz 16Bit 4KB N Y
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sym53c895A 40MHz 16Bit 8KB N Y
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sym53c896 40MHz 16Bit 8KB Y Y
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sym53c897 40MHz 16Bit 8KB Y Y
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sym53c1510D 40MHz 16Bit 4KB Y Y
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sym53c1010 80MHz 16Bit 8KB Y Y
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.El
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.Pp
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.Sh BUGS
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No known bugs.
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.Sh SEE ALSO
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.Xr cd 4 ,
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.Xr da 4 ,
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.Xr ncr 4 ,
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.Xr sa 4 ,
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.Xr scsi 4 ,
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.Xr camcontrol 8
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.Sh AUTHORS
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The
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.Nm
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driver has been written by Gerard Roudier and is derived from the
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Linux sym53c8xx driver from the same author.
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The sym53c8xx driver is derived from the ncr53c8xx driver that had been
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a port of the
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.Fx
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.Nm ncr
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driver to Linux-1.2.13.
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The original
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.Nm ncr
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driver was written for 386BSD and
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.Fx
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by Wolfgang Stanglmeier and Stefan Esser.
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Fx 4.0 .
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|