config root man

.\" 
.\" Copyright (c) 2012 Intel Corporation
.\" All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions, and the following disclaimer,
.\"    without modification.
.\" 2. Redistributions in binary form must reproduce at minimum a disclaimer
.\"    substantially similar to the "NO WARRANTY" disclaimer below
.\"    ("Disclaimer") and any redistribution must be conditioned upon
.\"    including a substantially similar Disclaimer requirement for further
.\"    binary redistribution.
.\" 
.\" NO WARRANTY
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
.\" HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
.\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGES.
.\" 
.\" isci driver man page.
.\"
.\" Author: Jim Harris <jimharris@FreeBSD.org>
.\"
.\" $FreeBSD: release/9.1.0/share/man/man4/isci.4 235578 2012-05-18 00:55:47Z gjb $
.\"
.Dd January 23, 2012
.Dt ISCI 4
.Os
.Sh NAME
.Nm isci
.Nd Intel C600 Serial Attached SCSI driver
.Sh SYNOPSIS
To compile this driver into your kernel,
place the following lines in your kernel configuration file:
.Bd -ragged -offset indent
.Cd "device scbus"
.Cd "device isci"
.Ed
.Pp
Or, to load the driver as a module at boot, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
isci_load="YES"
.Ed
.Sh HARDWARE
The
.Nm
driver provides support for Intel C600
.Tn SAS
controllers.
.Sh CONFIGURATION
To force legacy interrupts for all
.Nm
driver instances, set the following tunable value in
.Xr loader.conf 5 :
.Bd -literal -offset indent
hw.isci.force_legacy_interrupts=1
.Ed
.Sh DEBUGGING
To enable debugging prints from the
.Nm
driver, set the
.Bd -literal -offset indent
hw.isci.debug_level
.Ed
.Pp
variable to a value between 1 and 4 in
.Xr loader.conf 5 .
.Pp
The hardware layer in the
.Nm
driver has extensive logging capabilities
which are disabled by default for performance reasons.
These can be enabled by adding
.Bd -literal -offset indent
options ISCI_LOGGING
.Ed
.Pp
to the kernel configuration file. 
.Sh SEE ALSO
.Xr cd 4 ,
.Xr ch 4 ,
.Xr da 4 ,
.Xr pci 4 ,
.Xr sa 4 ,
.Xr scsi 4
.Sh HISTORY
The
.Nm
driver first appeared in
.Fx 8.3
and 9.1.
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was developed by Intel and originally written by
.An Jim Harris Aq jimharris@FreeBSD.org
with contributions from Sohaib Ahsan and input from
.An Scott Long Aq scottl@FreeBSD.org .
.Pp
This man page was written by
.An Jim Harris Aq jimharris@FreeBSD.org .