xref: /freebsd-10.1-release/sys/conf/NOTES

# $FreeBSD: head/sys/conf/NOTES 213705 2010-10-11 21:53:03Z thompsa $
#
# NOTES -- Lines that can be cut/pasted into kernel and hints configs.
#
# Lines that begin with 'device', 'options', 'machine', 'ident', 'maxusers',
# 'makeoptions', 'hints', etc. go into the kernel configuration that you
# run config(8) with.
#
# Lines that begin with 'hint.' are NOT for config(8), they go into your
# hints file.  See /boot/device.hints and/or the 'hints' config(8) directive.
#
# Please use ``make LINT'' to create an old-style LINT file if you want to
# do kernel test-builds.
#
# This file contains machine independent kernel configuration notes.  For
# machine dependent notes, look in /sys/<arch>/conf/NOTES.
#

#
# NOTES conventions and style guide:
#
# Large block comments should begin and end with a line containing only a
# comment character.
#
# To describe a particular object, a block comment (if it exists) should
# come first.  Next should come device, options, and hints lines in that
# order.  All device and option lines must be described by a comment that
# doesn't just expand the device or option name.  Use only a concise
# comment on the same line if possible.  Very detailed descriptions of
# devices and subsystems belong in man pages.
#
# A space followed by a tab separates 'options' from an option name.  Two
# spaces followed by a tab separate 'device' from a device name.  Comments
# after an option or device should use one space after the comment character.
# To comment out a negative option that disables code and thus should not be
# enabled for LINT builds, precede 'options' with "#!".
#

#
# This is the ``identification'' of the kernel.  Usually this should
# be the same as the name of your kernel.
#
ident		LINT

#
# The `maxusers' parameter controls the static sizing of a number of
# internal system tables by a formula defined in subr_param.c.
# Omitting this parameter or setting it to 0 will cause the system to
# auto-size based on physical memory.
#
maxusers	10

# To statically compile in device wiring instead of /boot/device.hints
#hints		"LINT.hints"		# Default places to look for devices.

# Use the following to compile in values accessible to the kernel
# through getenv() (or kenv(1) in userland). The format of the file
# is 'variable=value', see kenv(1)
#
#env		"LINT.env"

#
# The `makeoptions' parameter allows variables to be passed to the
# generated Makefile in the build area.
#
# CONF_CFLAGS gives some extra compiler flags that are added to ${CFLAGS}
# after most other flags.  Here we use it to inhibit use of non-optimal
# gcc built-in functions (e.g., memcmp).
#
# DEBUG happens to be magic.
# The following is equivalent to 'config -g KERNELNAME' and creates
# 'kernel.debug' compiled with -g debugging as well as a normal
# 'kernel'.  Use 'make install.debug' to install the debug kernel
# but that isn't normally necessary as the debug symbols are not loaded
# by the kernel and are not useful there anyway.
#
# KERNEL can be overridden so that you can change the default name of your
# kernel.
#
# MODULES_OVERRIDE can be used to limit modules built to a specific list.
#
makeoptions	CONF_CFLAGS=-fno-builtin  #Don't allow use of memcmp, etc.
#makeoptions	DEBUG=-g		#Build kernel with gdb(1) debug symbols
#makeoptions	KERNEL=foo		#Build kernel "foo" and install "/foo"
# Only build ext2fs module plus those parts of the sound system I need.
#makeoptions	MODULES_OVERRIDE="ext2fs sound/sound sound/driver/maestro3"
makeoptions	DESTDIR=/tmp

#
# FreeBSD processes are subject to certain limits to their consumption
# of system resources.  See getrlimit(2) for more details.  Each
# resource limit has two values, a "soft" limit and a "hard" limit.
# The soft limits can be modified during normal system operation, but
# the hard limits are set at boot time.  Their default values are
# in sys/<arch>/include/vmparam.h.  There are two ways to change them:
# 
# 1.  Set the values at kernel build time.  The options below are one
#     way to allow that limit to grow to 1GB.  They can be increased
#     further by changing the parameters:
#	
# 2.  In /boot/loader.conf, set the tunables kern.maxswzone,
#     kern.maxbcache, kern.maxtsiz, kern.dfldsiz, kern.maxdsiz,
#     kern.dflssiz, kern.maxssiz and kern.sgrowsiz.
#
# The options in /boot/loader.conf override anything in the kernel
# configuration file.  See the function init_param1 in
# sys/kern/subr_param.c for more details.
#

options 	MAXDSIZ=(1024UL*1024*1024)
options 	MAXSSIZ=(128UL*1024*1024)
options 	DFLDSIZ=(1024UL*1024*1024)

#
# BLKDEV_IOSIZE sets the default block size used in user block
# device I/O.  Note that this value will be overridden by the label
# when specifying a block device from a label with a non-0
# partition blocksize.  The default is PAGE_SIZE.
#
options 	BLKDEV_IOSIZE=8192

#
# MAXPHYS and DFLTPHYS
#
# These are the maximal and safe 'raw' I/O block device access sizes.
# Reads and writes will be split into MAXPHYS chunks for known good
# devices and DFLTPHYS for the rest. Some applications have better
# performance with larger raw I/O access sizes. Note that certain VM
# parameters are derived from these values and making them too large
# can make an an unbootable kernel.
#
# The defaults are 64K and 128K respectively.
options 	DFLTPHYS=(64*1024)
options 	MAXPHYS=(128*1024)


# This allows you to actually store this configuration file into
# the kernel binary itself. See config(8) for more details.
#
options 	INCLUDE_CONFIG_FILE     # Include this file in kernel

options 	GEOM_AES		# Don't use, use GEOM_BDE
options 	GEOM_BDE		# Disk encryption.
options 	GEOM_BSD		# BSD disklabels
options 	GEOM_CACHE		# Disk cache.
options 	GEOM_CONCAT		# Disk concatenation.
options 	GEOM_ELI		# Disk encryption.
options 	GEOM_FOX		# Redundant path mitigation
options 	GEOM_GATE		# Userland services.
options 	GEOM_JOURNAL		# Journaling.
options 	GEOM_LABEL		# Providers labelization.
options 	GEOM_LINUX_LVM		# Linux LVM2 volumes
options 	GEOM_MBR		# DOS/MBR partitioning
options 	GEOM_MIRROR		# Disk mirroring.
options 	GEOM_MULTIPATH		# Disk multipath
options 	GEOM_NOP		# Test class.
options 	GEOM_PART_APM		# Apple partitioning
options 	GEOM_PART_BSD		# BSD disklabel
options 	GEOM_PART_EBR		# Extended Boot Records
options 	GEOM_PART_EBR_COMPAT	# Backward compatible partition names
options 	GEOM_PART_GPT		# GPT partitioning
options 	GEOM_PART_MBR		# MBR partitioning
options 	GEOM_PART_PC98		# PC-9800 disk partitioning
options 	GEOM_PART_VTOC8		# SMI VTOC8 disk label
options 	GEOM_PC98		# NEC PC9800 partitioning
options 	GEOM_RAID3		# RAID3 functionality.
options 	GEOM_SHSEC		# Shared secret.
options 	GEOM_STRIPE		# Disk striping.
options 	GEOM_SUNLABEL		# Sun/Solaris partitioning
options 	GEOM_UZIP		# Read-only compressed disks
options 	GEOM_VIRSTOR		# Virtual storage.
options 	GEOM_VOL		# Volume names from UFS superblock
options 	GEOM_ZERO		# Performance testing helper.

#
# The root device and filesystem type can be compiled in;
# this provides a fallback option if the root device cannot
# be correctly guessed by the bootstrap code, or an override if
# the RB_DFLTROOT flag (-r) is specified when booting the kernel.
#
options 	ROOTDEVNAME=\"ufs:da0s2e\"


#####################################################################
# Scheduler options:
#
# Specifying one of SCHED_4BSD or SCHED_ULE is mandatory.  These options
# select which scheduler is compiled in.
#
# SCHED_4BSD is the historical, proven, BSD scheduler.  It has a global run
# queue and no CPU affinity which makes it suboptimal for SMP.  It has very
# good interactivity and priority selection.
#
# SCHED_ULE provides significant performance advantages over 4BSD on many
# workloads on SMP machines.  It supports cpu-affinity, per-cpu runqueues
# and scheduler locks.  It also has a stronger notion of interactivity 
# which leads to better responsiveness even on uniprocessor machines.  This
# is the default scheduler.
#
# SCHED_STATS is a debugging option which keeps some stats in the sysctl
# tree at 'kern.sched.stats' and is useful for debugging scheduling decisions.
#
options 	SCHED_4BSD
options 	SCHED_STATS
#options 	SCHED_ULE

#####################################################################
# SMP OPTIONS:
#
# SMP enables building of a Symmetric MultiProcessor Kernel.

# Mandatory:
options 	SMP			# Symmetric MultiProcessor Kernel

# ADAPTIVE_MUTEXES changes the behavior of blocking mutexes to spin
# if the thread that currently owns the mutex is executing on another
# CPU.  This behaviour is enabled by default, so this option can be used
# to disable it.
options 	NO_ADAPTIVE_MUTEXES

# ADAPTIVE_RWLOCKS changes the behavior of reader/writer locks to spin
# if the thread that currently owns the rwlock is executing on another
# CPU.  This behaviour is enabled by default, so this option can be used
# to disable it.
options 	NO_ADAPTIVE_RWLOCKS

# ADAPTIVE_SX changes the behavior of sx locks to spin if the thread that
# currently owns the sx lock is executing on another CPU.
# This behaviour is enabled by default, so this option can be used to
# disable it.
options 	NO_ADAPTIVE_SX

# MUTEX_NOINLINE forces mutex operations to call functions to perform each
# operation rather than inlining the simple cases.  This can be used to
# shrink the size of the kernel text segment.  Note that this behavior is
# already implied by the INVARIANT_SUPPORT, INVARIANTS, KTR, LOCK_PROFILING,
# and WITNESS options.
options 	MUTEX_NOINLINE

# RWLOCK_NOINLINE forces rwlock operations to call functions to perform each
# operation rather than inlining the simple cases.  This can be used to
# shrink the size of the kernel text segment.  Note that this behavior is
# already implied by the INVARIANT_SUPPORT, INVARIANTS, KTR, LOCK_PROFILING,
# and WITNESS options.
options 	RWLOCK_NOINLINE

# SX_NOINLINE forces sx lock operations to call functions to perform each
# operation rather than inlining the simple cases.  This can be used to
# shrink the size of the kernel text segment.  Note that this behavior is
# already implied by the INVARIANT_SUPPORT, INVARIANTS, KTR, LOCK_PROFILING,
# and WITNESS options.
options 	SX_NOINLINE

# SMP Debugging Options:
#
# PREEMPTION allows the threads that are in the kernel to be preempted by
#	  higher priority [interrupt] threads.  It helps with interactivity
#	  and allows interrupt threads to run sooner rather than waiting.
#	  WARNING! Only tested on amd64 and i386.
# FULL_PREEMPTION instructs the kernel to preempt non-realtime kernel
#	  threads.  Its sole use is to expose race conditions and other
#	  bugs during development.  Enabling this option will reduce
#	  performance and increase the frequency of kernel panics by
#	  design.  If you aren't sure that you need it then you don't.
#	  Relies on the PREEMPTION option.  DON'T TURN THIS ON.
# MUTEX_DEBUG enables various extra assertions in the mutex code.
# SLEEPQUEUE_PROFILING enables rudimentary profiling of the hash table
#	  used to hold active sleep queues as well as sleep wait message
#	  frequency.
# TURNSTILE_PROFILING enables rudimentary profiling of the hash table
#	  used to hold active lock queues.
# WITNESS enables the witness code which detects deadlocks and cycles
#         during locking operations.
# WITNESS_KDB causes the witness code to drop into the kernel debugger if
#	  a lock hierarchy violation occurs or if locks are held when going to
#	  sleep.
# WITNESS_SKIPSPIN disables the witness checks on spin mutexes.
options 	PREEMPTION
options 	FULL_PREEMPTION
options 	MUTEX_DEBUG
options 	WITNESS
options 	WITNESS_KDB
options 	WITNESS_SKIPSPIN

# LOCK_PROFILING - Profiling locks.  See LOCK_PROFILING(9) for details.
options 	LOCK_PROFILING
# Set the number of buffers and the hash size.  The hash size MUST be larger
# than the number of buffers.  Hash size should be prime.
options 	MPROF_BUFFERS="1536"
options 	MPROF_HASH_SIZE="1543"

# Profiling for internal hash tables.
options 	SLEEPQUEUE_PROFILING
options 	TURNSTILE_PROFILING


#####################################################################
# COMPATIBILITY OPTIONS

#
# Implement system calls compatible with 4.3BSD and older versions of
# FreeBSD.  You probably do NOT want to remove this as much current code
# still relies on the 4.3 emulation.  Note that some architectures that
# are supported by FreeBSD do not include support for certain important
# aspects of this compatibility option, namely those related to the
# signal delivery mechanism.
#
options 	COMPAT_43

# Old tty interface.
options 	COMPAT_43TTY

# Note that as a general rule, COMPAT_FREEBSD<n> depends on
# COMPAT_FREEBSD<n+1>, COMPAT_FREEBSD<n+2>, etc.

# Enable FreeBSD4 compatibility syscalls
options 	COMPAT_FREEBSD4

# Enable FreeBSD5 compatibility syscalls
options 	COMPAT_FREEBSD5

# Enable FreeBSD6 compatibility syscalls
options 	COMPAT_FREEBSD6

# Enable FreeBSD7 compatibility syscalls
options 	COMPAT_FREEBSD7

#
# These three options provide support for System V Interface
# Definition-style interprocess communication, in the form of shared
# memory, semaphores, and message queues, respectively.
#
options 	SYSVSHM
options 	SYSVSEM
options 	SYSVMSG


#####################################################################
# DEBUGGING OPTIONS

#
# Compile with kernel debugger related code.
#
options 	KDB

#
# Print a stack trace of the current thread on the console for a panic.
#
options 	KDB_TRACE

#
# Don't enter the debugger for a panic. Intended for unattended operation
# where you may want to enter the debugger from the console, but still want
# the machine to recover from a panic.
#
options 	KDB_UNATTENDED

#
# Enable the ddb debugger backend.
#
options 	DDB

#
# Print the numerical value of symbols in addition to the symbolic
# representation.
#
options 	DDB_NUMSYM

#
# Enable the remote gdb debugger backend.
#
options 	GDB

#
# SYSCTL_DEBUG enables a 'sysctl' debug tree that can be used to dump the
# contents of the registered sysctl nodes on the console.  It is disabled by
# default because it generates excessively verbose console output that can
# interfere with serial console operation.
#
options 	SYSCTL_DEBUG

#
# NO_SYSCTL_DESCR omits the sysctl node descriptions to save space in the
# resulting kernel.
options		NO_SYSCTL_DESCR

#
# MALLOC_DEBUG_MAXZONES enables multiple uma zones for malloc(9)
# allocations that are smaller than a page.  The purpose is to isolate
# different malloc types into hash classes, so that any buffer
# overruns or use-after-free will usually only affect memory from
# malloc types in that hash class.  This is purely a debugging tool;
# by varying the hash function and tracking which hash class was
# corrupted, the intersection of the hash classes from each instance
# will point to a single malloc type that is being misused.  At this
# point inspection or memguard(9) can be used to catch the offending
# code.
#
options 	MALLOC_DEBUG_MAXZONES=8

#
# DEBUG_MEMGUARD builds and enables memguard(9), a replacement allocator
# for the kernel used to detect modify-after-free scenarios.  See the
# memguard(9) man page for more information on usage.
#
options 	DEBUG_MEMGUARD

#
# DEBUG_REDZONE enables buffer underflows and buffer overflows detection for
# malloc(9).
#
options 	DEBUG_REDZONE

#
# KTRACE enables the system-call tracing facility ktrace(2).  To be more
# SMP-friendly, KTRACE uses a worker thread to process most trace events
# asynchronously to the thread generating the event.  This requires a
# pre-allocated store of objects representing trace events.  The
# KTRACE_REQUEST_POOL option specifies the initial size of this store.
# The size of the pool can be adjusted both at boottime and runtime via
# the kern.ktrace_request_pool tunable and sysctl.
#
options 	KTRACE			#kernel tracing
options 	KTRACE_REQUEST_POOL=101

#
# KTR is a kernel tracing facility imported from BSD/OS.  It is
# enabled with the KTR option.  KTR_ENTRIES defines the number of
# entries in the circular trace buffer; it must be a power of two.
# KTR_COMPILE defines the mask of events to compile into the kernel as
# defined by the KTR_* constants in <sys/ktr.h>.  KTR_MASK defines the
# initial value of the ktr_mask variable which determines at runtime
# what events to trace.  KTR_CPUMASK determines which CPU's log
# events, with bit X corresponding to CPU X.  KTR_VERBOSE enables
# dumping of KTR events to the console by default.  This functionality
# can be toggled via the debug.ktr_verbose sysctl and defaults to off
# if KTR_VERBOSE is not defined.  See ktr(4) and ktrdump(8) for details.
#
options 	KTR
options 	KTR_ENTRIES=1024
options 	KTR_COMPILE=(KTR_INTR|KTR_PROC)
options 	KTR_MASK=KTR_INTR
options 	KTR_CPUMASK=0x3
options 	KTR_VERBOSE

#
# ALQ(9) is a facility for the asynchronous queuing of records from the kernel
# to a vnode, and is employed by services such as ktr(4) to produce trace
# files based on a kernel event stream.  Records are written asynchronously
# in a worker thread.
#
options 	ALQ
options 	KTR_ALQ

#
# The INVARIANTS option is used in a number of source files to enable
# extra sanity checking of internal structures.  This support is not
# enabled by default because of the extra time it would take to check
# for these conditions, which can only occur as a result of
# programming errors.
#
options 	INVARIANTS

#
# The INVARIANT_SUPPORT option makes us compile in support for
# verifying some of the internal structures.  It is a prerequisite for
# 'INVARIANTS', as enabling 'INVARIANTS' will make these functions be
# called.  The intent is that you can set 'INVARIANTS' for single
# source files (by changing the source file or specifying it on the
# command line) if you have 'INVARIANT_SUPPORT' enabled.  Also, if you
# wish to build a kernel module with 'INVARIANTS', then adding
# 'INVARIANT_SUPPORT' to your kernel will provide all the necessary
# infrastructure without the added overhead.
#
options 	INVARIANT_SUPPORT

#
# The DIAGNOSTIC option is used to enable extra debugging information
# from some parts of the kernel.  As this makes everything more noisy,
# it is disabled by default.
#
options 	DIAGNOSTIC

#
# REGRESSION causes optional kernel interfaces necessary only for regression
# testing to be enabled.  These interfaces may constitute security risks
# when enabled, as they permit processes to easily modify aspects of the
# run-time environment to reproduce unlikely or unusual (possibly normally
# impossible) scenarios.
#
options 	REGRESSION

#
# RESTARTABLE_PANICS allows one to continue from a panic as if it were
# a call to the debugger to continue from a panic as instead.  It is only
# useful if a kernel debugger is present.  To restart from a panic, reset
# the panicstr variable to NULL and continue execution.  This option is
# for development use only and should NOT be used in production systems
# to "workaround" a panic.
#
#options 	RESTARTABLE_PANICS

#
# This option lets some drivers co-exist that can't co-exist in a running
# system.  This is used to be able to compile all kernel code in one go for
# quality assurance purposes (like this file, which the option takes it name
# from.)
#
options 	COMPILING_LINT

#
# STACK enables the stack(9) facility, allowing the capture of kernel stack
# for the purpose of procinfo(1), etc.  stack(9) will also be compiled in
# automatically if DDB(4) is compiled into the kernel.
#
options 	STACK


#####################################################################
# PERFORMANCE MONITORING OPTIONS

#
# The hwpmc driver that allows the use of in-CPU performance monitoring
# counters for performance monitoring.  The base kernel needs to be configured
# with the 'options' line, while the hwpmc device can be either compiled
# in or loaded as a loadable kernel module.
#
# Additional configuration options may be required on specific architectures,
# please see hwpmc(4).

device		hwpmc			# Driver (also a loadable module)
options 	HWPMC_HOOKS		# Other necessary kernel hooks


#####################################################################
# NETWORKING OPTIONS

#
# Protocol families
#
options 	INET			#Internet communications protocols
options 	INET6			#IPv6 communications protocols

options 	ROUTETABLES=2		# max 16. 1 is back compatible.

# In order to enable IPSEC you MUST also add device crypto to 
# your kernel configuration
options 	IPSEC			#IP security (requires device crypto)
#options 	IPSEC_DEBUG		#debug for IP security
#
# #DEPRECATED#
# Set IPSEC_FILTERTUNNEL to change the default of the sysctl to force packets
# coming through a tunnel to be processed by any configured packet filtering
# twice. The default is that packets coming out of a tunnel are _not_ processed;
# they are assumed trusted.
#
# IPSEC history is preserved for such packets, and can be filtered
# using ipfw(8)'s 'ipsec' keyword, when this option is enabled.
#
#options 	IPSEC_FILTERTUNNEL	#filter ipsec packets from a tunnel
#
# Set IPSEC_NAT_T to enable NAT-Traversal support.  This enables
# optional UDP encapsulation of ESP packets.
#
options		IPSEC_NAT_T		#NAT-T support, UDP encap of ESP

options 	IPX			#IPX/SPX communications protocols

options 	NCP			#NetWare Core protocol

options 	NETATALK		#Appletalk communications protocols
options 	NETATALKDEBUG		#Appletalk debugging

#
# SMB/CIFS requester
# NETSMB enables support for SMB protocol, it requires LIBMCHAIN and LIBICONV
# options.
options 	NETSMB			#SMB/CIFS requester

# mchain library. It can be either loaded as KLD or compiled into kernel
options 	LIBMCHAIN

# libalias library, performing NAT
options 	LIBALIAS

# flowtable cache
options 	FLOWTABLE

#
# SCTP is a NEW transport protocol defined by
# RFC2960 updated by RFC3309 and RFC3758.. and
# soon to have a new base RFC and many many more
# extensions. This release supports all the extensions
# including many drafts (most about to become RFC's).
# It is the reference implementation of SCTP
# and is quite well tested.
#
# Note YOU MUST have both INET and INET6 defined.
# You don't have to enable V6, but SCTP is 
# dual stacked and so far we have not torn apart
# the V6 and V4.. since an association can span
# both a V6 and V4 address at the SAME time :-)
#
options 	SCTP
# There are bunches of options:
# this one turns on all sorts of
# nastly printing that you can
# do. It's all controlled by a
# bit mask (settable by socket opt and
# by sysctl). Including will not cause
# logging until you set the bits.. but it
# can be quite verbose.. so without this
# option we don't do any of the tests for
# bits and prints.. which makes the code run
# faster.. if you are not debugging don't use.
options 	SCTP_DEBUG
#
# This option turns off the CRC32c checksum. Basically,
# you will not be able to talk to anyone else who
# has not done this. Its more for experimentation to
# see how much CPU the CRC32c really takes. Most new
# cards for TCP support checksum offload.. so this 
# option gives you a "view" into what SCTP would be
# like with such an offload (which only exists in
# high in iSCSI boards so far). With the new
# splitting 8's algorithm its not as bad as it used
# to be.. but it does speed things up try only
# for in a captured lab environment :-)
options 	SCTP_WITH_NO_CSUM
#

#
# All that options after that turn on specific types of
# logging. You can monitor CWND growth, flight size
# and all sorts of things. Go look at the code and
# see. I have used this to produce interesting 
# charts and graphs as well :->
# 
# I have not yet committed the tools to get and print
# the logs, I will do that eventually .. before then
# if you want them send me an email rrs@freebsd.org
# You basically must have ktr(4) enabled for these
# and you then set the sysctl to turn on/off various
# logging bits. Use ktrdump(8) to pull the log and run
# it through a display program.. and graphs and other
# things too.
#
options 	SCTP_LOCK_LOGGING
options 	SCTP_MBUF_LOGGING
options 	SCTP_MBCNT_LOGGING
options 	SCTP_PACKET_LOGGING
options 	SCTP_LTRACE_CHUNKS
options 	SCTP_LTRACE_ERRORS


# altq(9). Enable the base part of the hooks with the ALTQ option.
# Individual disciplines must be built into the base system and can not be
# loaded as modules at this point. ALTQ requires a stable TSC so if yours is
# broken or changes with CPU throttling then you must also have the ALTQ_NOPCC
# option.
options 	ALTQ
options 	ALTQ_CBQ	# Class Based Queueing
options 	ALTQ_RED	# Random Early Detection
options 	ALTQ_RIO	# RED In/Out
options 	ALTQ_HFSC	# Hierarchical Packet Scheduler
options 	ALTQ_CDNR	# Traffic conditioner
options 	ALTQ_PRIQ	# Priority Queueing
options 	ALTQ_NOPCC	# Required if the TSC is unusable
options 	ALTQ_DEBUG

# netgraph(4). Enable the base netgraph code with the NETGRAPH option.
# Individual node types can be enabled with the corresponding option
# listed below; however, this is not strictly necessary as netgraph
# will automatically load the corresponding KLD module if the node type
# is not already compiled into the kernel. Each type below has a
# corresponding man page, e.g., ng_async(8).
options 	NETGRAPH		# netgraph(4) system
options 	NETGRAPH_DEBUG		# enable extra debugging, this
					# affects netgraph(4) and nodes
# Node types
options 	NETGRAPH_ASYNC
options 	NETGRAPH_ATMLLC
options 	NETGRAPH_ATM_ATMPIF
options 	NETGRAPH_BLUETOOTH		# ng_bluetooth(4)
options 	NETGRAPH_BLUETOOTH_BT3C		# ng_bt3c(4)
options 	NETGRAPH_BLUETOOTH_HCI		# ng_hci(4)
options 	NETGRAPH_BLUETOOTH_L2CAP	# ng_l2cap(4)
options 	NETGRAPH_BLUETOOTH_SOCKET	# ng_btsocket(4)
options 	NETGRAPH_BLUETOOTH_UBT		# ng_ubt(4)
options 	NETGRAPH_BLUETOOTH_UBTBCMFW	# ubtbcmfw(4)
options 	NETGRAPH_BPF
options 	NETGRAPH_BRIDGE
options 	NETGRAPH_CAR
options 	NETGRAPH_CISCO
options 	NETGRAPH_DEFLATE
options 	NETGRAPH_DEVICE
options 	NETGRAPH_ECHO
options 	NETGRAPH_EIFACE
options 	NETGRAPH_ETHER
options 	NETGRAPH_FEC
options 	NETGRAPH_FRAME_RELAY
options 	NETGRAPH_GIF
options 	NETGRAPH_GIF_DEMUX
options 	NETGRAPH_HOLE
options 	NETGRAPH_IFACE
options 	NETGRAPH_IP_INPUT
options 	NETGRAPH_IPFW
options 	NETGRAPH_KSOCKET
options 	NETGRAPH_L2TP
options 	NETGRAPH_LMI
# MPPC compression requires proprietary files (not included)
#options 	NETGRAPH_MPPC_COMPRESSION
options 	NETGRAPH_MPPC_ENCRYPTION
options 	NETGRAPH_NETFLOW
options 	NETGRAPH_NAT
options 	NETGRAPH_ONE2MANY
options 	NETGRAPH_PATCH
options 	NETGRAPH_PIPE
options 	NETGRAPH_PPP
options 	NETGRAPH_PPPOE
options 	NETGRAPH_PPTPGRE
options 	NETGRAPH_PRED1
options 	NETGRAPH_RFC1490
options 	NETGRAPH_SOCKET
options 	NETGRAPH_SPLIT
options 	NETGRAPH_SPPP
options 	NETGRAPH_TAG
options 	NETGRAPH_TCPMSS
options 	NETGRAPH_TEE
options 	NETGRAPH_UI
options 	NETGRAPH_VJC
options 	NETGRAPH_VLAN

# NgATM - Netgraph ATM
options 	NGATM_ATM
options 	NGATM_ATMBASE
options 	NGATM_SSCOP
options 	NGATM_SSCFU
options 	NGATM_UNI
options 	NGATM_CCATM

device		mn	# Munich32x/Falc54 Nx64kbit/sec cards.

#
# Network interfaces:
#  The `loop' device is MANDATORY when networking is enabled.
device		loop

#  The `ether' device provides generic code to handle
#  Ethernets; it is MANDATORY when an Ethernet device driver is
#  configured or token-ring is enabled.
device		ether

#  The `vlan' device implements the VLAN tagging of Ethernet frames
#  according to IEEE 802.1Q.
device		vlan

#  The `wlan' device provides generic code to support 802.11
#  drivers, including host AP mode; it is MANDATORY for the wi,
#  and ath drivers and will eventually be required by all 802.11 drivers.
device		wlan
options 	IEEE80211_DEBUG		#enable debugging msgs
options 	IEEE80211_AMPDU_AGE	#age frames in AMPDU reorder q's
options 	IEEE80211_SUPPORT_MESH	#enable 802.11s D3.0 support
options 	IEEE80211_SUPPORT_TDMA	#enable TDMA support

#  The `wlan_wep', `wlan_tkip', and `wlan_ccmp' devices provide
#  support for WEP, TKIP, and AES-CCMP crypto protocols optionally
#  used with 802.11 devices that depend on the `wlan' module.
device		wlan_wep
device		wlan_ccmp
device		wlan_tkip

#  The `wlan_xauth' device provides support for external (i.e. user-mode)
#  authenticators for use with 802.11 drivers that use the `wlan'
#  module and support 802.1x and/or WPA security protocols.
device		wlan_xauth

#  The `wlan_acl' device provides a MAC-based access control mechanism
#  for use with 802.11 drivers operating in ap mode and using the
#  `wlan' module.
#  The 'wlan_amrr' device provides AMRR transmit rate control algorithm
device		wlan_acl
device		wlan_amrr

# Generic TokenRing
device		token

#  The `fddi' device provides generic code to support FDDI.
device		fddi

#  The `arcnet' device provides generic code to support Arcnet.
device		arcnet

#  The `sppp' device serves a similar role for certain types
#  of synchronous PPP links (like `cx', `ar').
device		sppp

#  The `bpf' device enables the Berkeley Packet Filter.  Be
#  aware of the legal and administrative consequences of enabling this
#  option.  DHCP requires bpf.
device		bpf

#  The `disc' device implements a minimal network interface,
#  which throws away all packets sent and never receives any.  It is
#  included for testing and benchmarking purposes.
device		disc

# The `epair' device implements a virtual back-to-back connected Ethernet
# like interface pair.
device		epair

#  The `edsc' device implements a minimal Ethernet interface,
#  which discards all packets sent and receives none.
device		edsc

#  The `tap' device is a pty-like virtual Ethernet interface
device		tap

#  The `tun' device implements (user-)ppp and nos-tun(8)
device		tun

#  The `gif' device implements IPv6 over IP4 tunneling,
#  IPv4 over IPv6 tunneling, IPv4 over IPv4 tunneling and
#  IPv6 over IPv6 tunneling.
#  The `gre' device implements two types of IP4 over IP4 tunneling:
#  GRE and MOBILE, as specified in the RFC1701 and RFC2004.
#  The XBONEHACK option allows the same pair of addresses to be configured on
#  multiple gif interfaces.
device		gif
device		gre
options 	XBONEHACK

#  The `faith' device captures packets sent to it and diverts them
#  to the IPv4/IPv6 translation daemon.
#  The `stf' device implements 6to4 encapsulation.
device		faith
device		stf

#  The `ef' device provides support for multiple ethernet frame types
#  specified via ETHER_* options. See ef(4) for details.
device		ef
options 	ETHER_II		# enable Ethernet_II frame
options 	ETHER_8023		# enable Ethernet_802.3 (Novell) frame
options 	ETHER_8022		# enable Ethernet_802.2 frame
options 	ETHER_SNAP		# enable Ethernet_802.2/SNAP frame

# The pf packet filter consists of three devices:
#  The `pf' device provides /dev/pf and the firewall code itself.
#  The `pflog' device provides the pflog0 interface which logs packets.
#  The `pfsync' device provides the pfsync0 interface used for
#   synchronization of firewall state tables (over the net).
device		pf
device		pflog
device		pfsync

# Bridge interface.
device		if_bridge

# Common Address Redundancy Protocol. See carp(4) for more details.
device		carp

# IPsec interface.
device		enc

# Link aggregation interface.
device		lagg

#
# Internet family options:
#
# MROUTING enables the kernel multicast packet forwarder, which works
# with mrouted and XORP.
#
# IPFIREWALL enables support for IP firewall construction, in
# conjunction with the `ipfw' program.  IPFIREWALL_VERBOSE sends
# logged packets to the system logger.  IPFIREWALL_VERBOSE_LIMIT
# limits the number of times a matching entry can be logged.
#
# WARNING:  IPFIREWALL defaults to a policy of "deny ip from any to any"
# and if you do not add other rules during startup to allow access,
# YOU WILL LOCK YOURSELF OUT.  It is suggested that you set firewall_type=open
# in /etc/rc.conf when first enabling this feature, then refining the
# firewall rules in /etc/rc.firewall after you've tested that the new kernel
# feature works properly.
#
# IPFIREWALL_DEFAULT_TO_ACCEPT causes the default rule (at boot) to
# allow everything.  Use with care, if a cracker can crash your
# firewall machine, they can get to your protected machines.  However,
# if you are using it as an as-needed filter for specific problems as
# they arise, then this may be for you.  Changing the default to 'allow'
# means that you won't get stuck if the kernel and /sbin/ipfw binary get
# out of sync.
#
# IPDIVERT enables the divert IP sockets, used by ``ipfw divert''.  It
# depends on IPFIREWALL if compiled into the kernel.
#
# IPFIREWALL_FORWARD enables changing of the packet destination either
# to do some sort of policy routing or transparent proxying.  Used by
# ``ipfw forward''. All  redirections apply to locally generated
# packets too.  Because of this great care is required when
# crafting the ruleset.
#
# IPFIREWALL_NAT adds support for in kernel nat in ipfw, and it requires
# LIBALIAS.
#
# IPSTEALTH enables code to support stealth forwarding (i.e., forwarding
# packets without touching the TTL).  This can be useful to hide firewalls
# from traceroute and similar tools.
#
# TCPDEBUG enables code which keeps traces of the TCP state machine
# for sockets with the SO_DEBUG option set, which can then be examined
# using the trpt(8) utility.
#
options 	MROUTING		# Multicast routing
options 	IPFIREWALL		#firewall
options 	IPFIREWALL_VERBOSE	#enable logging to syslogd(8)
options 	IPFIREWALL_VERBOSE_LIMIT=100	#limit verbosity
options 	IPFIREWALL_DEFAULT_TO_ACCEPT	#allow everything by default
options 	IPFIREWALL_FORWARD	#packet destination changes
options 	IPFIREWALL_NAT		#ipfw kernel nat support
options 	IPDIVERT		#divert sockets
options 	IPFILTER		#ipfilter support
options 	IPFILTER_LOG		#ipfilter logging
options 	IPFILTER_LOOKUP		#ipfilter pools
options 	IPFILTER_DEFAULT_BLOCK	#block all packets by default
options 	IPSTEALTH		#support for stealth forwarding
options 	TCPDEBUG

# The MBUF_STRESS_TEST option enables options which create
# various random failures / extreme cases related to mbuf
# functions.  See mbuf(9) for a list of available test cases.
# MBUF_PROFILING enables code to profile the mbuf chains
# exiting the system (via participating interfaces) and
# return a logarithmic histogram of monitored parameters
# (e.g. packet size, wasted space, number of mbufs in chain).
options 	MBUF_STRESS_TEST
options 	MBUF_PROFILING

# Statically link in accept filters
options 	ACCEPT_FILTER_DATA
options 	ACCEPT_FILTER_DNS
options 	ACCEPT_FILTER_HTTP

# TCP_SIGNATURE adds support for RFC 2385 (TCP-MD5) digests. These are
# carried in TCP option 19. This option is commonly used to protect
# TCP sessions (e.g. BGP) where IPSEC is not available nor desirable.
# This is enabled on a per-socket basis using the TCP_MD5SIG socket option.
# This requires the use of 'device crypto', 'options IPSEC'
# or 'device cryptodev'.
options 	TCP_SIGNATURE		#include support for RFC 2385

# DUMMYNET enables the "dummynet" bandwidth limiter.  You need IPFIREWALL
# as well.  See dummynet(4) and ipfw(8) for more info.  When you run
# DUMMYNET it is advisable to also have at least "options HZ=1000" to achieve
# a smooth scheduling of the traffic.
options 	DUMMYNET

# Zero copy sockets support.  This enables "zero copy" for sending and
# receiving data via a socket.  The send side works for any type of NIC,
# the receive side only works for NICs that support MTUs greater than the
# page size of your architecture and that support header splitting.  See
# zero_copy(9) for more details.
options 	ZERO_COPY_SOCKETS


#####################################################################
# FILESYSTEM OPTIONS

#
# Only the root, /usr, and /tmp filesystems need be statically
# compiled; everything else will be automatically loaded at mount
# time.  (Exception: the UFS family--- FFS --- cannot
# currently be demand-loaded.)  Some people still prefer to statically
# compile other filesystems as well.
#
# NB: The PORTAL filesystem is known to be buggy, and WILL panic your
# system if you attempt to do anything with it.  It is included here
# as an incentive for some enterprising soul to sit down and fix it.
# The UNION filesystem was known to be buggy in the past.  It is now
# being actively maintained, although there are still some issues being
# resolved.
#

# One of these is mandatory:
options 	FFS			#Fast filesystem
options 	NFSCLIENT		#Network File System client

# The rest are optional:
options 	CD9660			#ISO 9660 filesystem
options 	FDESCFS			#File descriptor filesystem
options 	HPFS			#OS/2 File system
options 	MSDOSFS			#MS DOS File System (FAT, FAT32)
options 	NFSSERVER		#Network File System server
options 	NFSLOCKD		#Network Lock Manager
options 	NFSCL			#experimental NFS client with NFSv4
options 	NFSD			#experimental NFS server with NFSv4
options 	KGSSAPI			#Kernel GSSAPI implementation

# NT File System. Read-mostly, see mount_ntfs(8) for details.
# For a full read-write NTFS support consider sysutils/fusefs-ntfs
# port/package.
options 	NTFS

options 	NULLFS			#NULL filesystem
# Broken (depends on NCP):
#options 	NWFS			#NetWare filesystem
options 	PORTALFS		#Portal filesystem
options 	PROCFS			#Process filesystem (requires PSEUDOFS)
options 	PSEUDOFS		#Pseudo-filesystem framework
options 	PSEUDOFS_TRACE		#Debugging support for PSEUDOFS
options 	SMBFS			#SMB/CIFS filesystem
options 	UDF			#Universal Disk Format
options 	UNIONFS			#Union filesystem
# The xFS_ROOT options REQUIRE the associated ``options xFS''
options 	NFS_ROOT		#NFS usable as root device

# Soft updates is a technique for improving filesystem speed and
# making abrupt shutdown less risky.
#
options 	SOFTUPDATES

# Extended attributes allow additional data to be associated with files,
# and is used for ACLs, Capabilities, and MAC labels.
# See src/sys/ufs/ufs/README.extattr for more information.
options 	UFS_EXTATTR
options 	UFS_EXTATTR_AUTOSTART

# Access Control List support for UFS filesystems.  The current ACL
# implementation requires extended attribute support, UFS_EXTATTR,
# for the underlying filesystem.
# See src/sys/ufs/ufs/README.acls for more information.
options 	UFS_ACL

# Directory hashing improves the speed of operations on very large
# directories at the expense of some memory.
options 	UFS_DIRHASH

# Gjournal-based UFS journaling support.
options 	UFS_GJOURNAL

# Make space in the kernel for a root filesystem on a md device.
# Define to the number of kilobytes to reserve for the filesystem.
options 	MD_ROOT_SIZE=10

# Make the md device a potential root device, either with preloaded
# images of type mfs_root or md_root.
options 	MD_ROOT

# Disk quotas are supported when this option is enabled.
options 	QUOTA			#enable disk quotas

# If you are running a machine just as a fileserver for PC and MAC
# users, using SAMBA or Netatalk, you may consider setting this option
# and keeping all those users' directories on a filesystem that is
# mounted with the suiddir option. This gives new files the same
# ownership as the directory (similar to group). It's a security hole
# if you let these users run programs, so confine it to file-servers
# (but it'll save you lots of headaches in those cases). Root owned
# directories are exempt and X bits are cleared. The suid bit must be
# set on the directory as well; see chmod(1). PC owners can't see/set
# ownerships so they keep getting their toes trodden on. This saves
# you all the support calls as the filesystem it's used on will act as
# they expect: "It's my dir so it must be my file".
#
options 	SUIDDIR

# NFS options:
options 	NFS_MINATTRTIMO=3	# VREG attrib cache timeout in sec
options 	NFS_MAXATTRTIMO=60
options 	NFS_MINDIRATTRTIMO=30	# VDIR attrib cache timeout in sec
options 	NFS_MAXDIRATTRTIMO=60
options 	NFS_GATHERDELAY=10	# Default write gather delay (msec)
options 	NFS_WDELAYHASHSIZ=16	# and with this
options 	NFS_DEBUG		# Enable NFS Debugging

# Coda stuff:
options 	CODA			#CODA filesystem.
device		vcoda			#coda minicache <-> venus comm.
# Use the old Coda 5.x venus<->kernel interface instead of the new
# realms-aware 6.x protocol.
#options 	CODA_COMPAT_5

#
# Add support for the EXT2FS filesystem of Linux fame.  Be a bit
# careful with this - the ext2fs code has a tendency to lag behind
# changes and not be exercised very much, so mounting read/write could
# be dangerous (and even mounting read only could result in panics.)
#
options 	EXT2FS

#
# Add support for the ReiserFS filesystem (used in Linux). Currently,
# this is limited to read-only access.
#
options 	REISERFS

#
# Add support for the SGI XFS filesystem. Currently,
# this is limited to read-only access.
#
options 	XFS

# Use real implementations of the aio_* system calls.  There are numerous
# stability and security issues in the current aio code that make it
# unsuitable for inclusion on machines with untrusted local users.
options 	VFS_AIO

# Cryptographically secure random number generator; /dev/random
device		random

# The system memory devices; /dev/mem, /dev/kmem
device		mem

# The kernel symbol table device; /dev/ksyms
device		ksyms

# Optional character code conversion support with LIBICONV.
# Each option requires their base file system and LIBICONV.
options 	CD9660_ICONV
options 	MSDOSFS_ICONV
options 	NTFS_ICONV
options 	UDF_ICONV


#####################################################################
# POSIX P1003.1B

# Real time extensions added in the 1993 POSIX
# _KPOSIX_PRIORITY_SCHEDULING: Build in _POSIX_PRIORITY_SCHEDULING

options 	_KPOSIX_PRIORITY_SCHEDULING
# p1003_1b_semaphores are very experimental,
# user should be ready to assist in debugging if problems arise.
options 	P1003_1B_SEMAPHORES

# POSIX message queue
options 	P1003_1B_MQUEUE

#####################################################################
# SECURITY POLICY PARAMETERS

# Support for BSM audit
options 	AUDIT

# Support for Mandatory Access Control (MAC):
options 	MAC
options 	MAC_BIBA
options 	MAC_BSDEXTENDED
options 	MAC_IFOFF
options 	MAC_LOMAC
options 	MAC_MLS
options 	MAC_NONE
options 	MAC_PARTITION
options 	MAC_PORTACL
options 	MAC_SEEOTHERUIDS
options 	MAC_STUB
options 	MAC_TEST


#####################################################################
# CLOCK OPTIONS

# The granularity of operation is controlled by the kernel option HZ whose
# default value (1000 on most architectures) means a granularity of 1ms
# (1s/HZ).  Historically, the default was 100, but finer granularity is
# required for DUMMYNET and other systems on modern hardware.  There are
# reasonable arguments that HZ should, in fact, be 100 still; consider,
# that reducing the granularity too much might cause excessive overhead in
# clock interrupt processing, potentially causing ticks to be missed and thus
# actually reducing the accuracy of operation.

options 	HZ=100

# Enable support for the kernel PLL to use an external PPS signal,
# under supervision of [x]ntpd(8)
# More info in ntpd documentation: http://www.eecis.udel.edu/~ntp

options 	PPS_SYNC


#####################################################################
# SCSI DEVICES

# SCSI DEVICE CONFIGURATION

# The SCSI subsystem consists of the `base' SCSI code, a number of
# high-level SCSI device `type' drivers, and the low-level host-adapter
# device drivers.  The host adapters are listed in the ISA and PCI
# device configuration sections below.
#
# It is possible to wire down your SCSI devices so that a given bus,
# target, and LUN always come on line as the same device unit.  In
# earlier versions the unit numbers were assigned in the order that
# the devices were probed on the SCSI bus.  This means that if you
# removed a disk drive, you may have had to rewrite your /etc/fstab
# file, and also that you had to be careful when adding a new disk
# as it may have been probed earlier and moved your device configuration
# around.  (See also option GEOM_VOL for a different solution to this
# problem.)

# This old behavior is maintained as the default behavior.  The unit
# assignment begins with the first non-wired down unit for a device
# type.  For example, if you wire a disk as "da3" then the first
# non-wired disk will be assigned da4.

# The syntax for wiring down devices is:

hint.scbus.0.at="ahc0"
hint.scbus.1.at="ahc1"
hint.scbus.1.bus="0"
hint.scbus.3.at="ahc2"
hint.scbus.3.bus="0"
hint.scbus.2.at="ahc2"
hint.scbus.2.bus="1"
hint.da.0.at="scbus0"
hint.da.0.target="0"
hint.da.0.unit="0"
hint.da.1.at="scbus3"
hint.da.1.target="1"
hint.da.2.at="scbus2"
hint.da.2.target="3"
hint.sa.1.at="scbus1"
hint.sa.1.target="6"

# "units" (SCSI logical unit number) that are not specified are
# treated as if specified as LUN 0.

# All SCSI devices allocate as many units as are required.

# The ch driver drives SCSI Media Changer ("jukebox") devices.
#
# The da driver drives SCSI Direct Access ("disk") and Optical Media
# ("WORM") devices.
#
# The sa driver drives SCSI Sequential Access ("tape") devices.
#
# The cd driver drives SCSI Read Only Direct Access ("cd") devices.
#
# The ses driver drives SCSI Environment Services ("ses") and
# SAF-TE ("SCSI Accessible Fault-Tolerant Enclosure") devices.
#
# The pt driver drives SCSI Processor devices.
#
# The sg driver provides a passthrough API that is compatible with the
# Linux SG driver.  It will work in conjunction with the COMPAT_LINUX
# option to run linux SG apps.  It can also stand on its own and provide
# source level API compatiblity for porting apps to FreeBSD.
#
# Target Mode support is provided here but also requires that a SIM
# (SCSI Host Adapter Driver) provide support as well.
#
# The targ driver provides target mode support as a Processor type device.
# It exists to give the minimal context necessary to respond to Inquiry
# commands. There is a sample user application that shows how the rest
# of the command support might be done in /usr/share/examples/scsi_target.
#
# The targbh driver provides target mode support and exists to respond
# to incoming commands that do not otherwise have a logical unit assigned
# to them.
#
# The "unknown" device (uk? in pre-2.0.5) is now part of the base SCSI
# configuration as the "pass" driver.

device		scbus		#base SCSI code
device		ch		#SCSI media changers
device		da		#SCSI direct access devices (aka disks)
device		sa		#SCSI tapes
device		cd		#SCSI CD-ROMs
device		ses		#SCSI Environmental Services (and SAF-TE)
device		pt		#SCSI processor
device		targ		#SCSI Target Mode Code
device		targbh		#SCSI Target Mode Blackhole Device
device		pass		#CAM passthrough driver
device		sg		#Linux SCSI passthrough

# CAM OPTIONS:
# debugging options:
# -- NOTE --  If you specify one of the bus/target/lun options, you must
#             specify them all!
# CAMDEBUG: When defined enables debugging macros
# CAM_DEBUG_BUS:  Debug the given bus.  Use -1 to debug all busses.
# CAM_DEBUG_TARGET:  Debug the given target.  Use -1 to debug all targets.
# CAM_DEBUG_LUN:  Debug the given lun.  Use -1 to debug all luns.
# CAM_DEBUG_FLAGS:  OR together CAM_DEBUG_INFO, CAM_DEBUG_TRACE,
#                   CAM_DEBUG_SUBTRACE, and CAM_DEBUG_CDB
#
# CAM_MAX_HIGHPOWER: Maximum number of concurrent high power (start unit) cmds
# SCSI_NO_SENSE_STRINGS: When defined disables sense descriptions
# SCSI_NO_OP_STRINGS: When defined disables opcode descriptions
# SCSI_DELAY: The number of MILLISECONDS to freeze the SIM (scsi adapter)
#             queue after a bus reset, and the number of milliseconds to
#             freeze the device queue after a bus device reset.  This
#             can be changed at boot and runtime with the
#             kern.cam.scsi_delay tunable/sysctl.
options 	CAMDEBUG
options 	CAM_DEBUG_BUS=-1
options 	CAM_DEBUG_TARGET=-1
options 	CAM_DEBUG_LUN=-1
options 	CAM_DEBUG_FLAGS=(CAM_DEBUG_INFO|CAM_DEBUG_TRACE|CAM_DEBUG_CDB)
options 	CAM_MAX_HIGHPOWER=4
options 	SCSI_NO_SENSE_STRINGS
options 	SCSI_NO_OP_STRINGS
options 	SCSI_DELAY=5000	# Be pessimistic about Joe SCSI device

# Options for the CAM CDROM driver:
# CHANGER_MIN_BUSY_SECONDS: Guaranteed minimum time quantum for a changer LUN
# CHANGER_MAX_BUSY_SECONDS: Maximum time quantum per changer LUN, only
#                           enforced if there is I/O waiting for another LUN
# The compiled in defaults for these variables are 2 and 10 seconds,
# respectively.
#
# These can also be changed on the fly with the following sysctl variables:
# kern.cam.cd.changer.min_busy_seconds
# kern.cam.cd.changer.max_busy_seconds
#
options 	CHANGER_MIN_BUSY_SECONDS=2
options 	CHANGER_MAX_BUSY_SECONDS=10

# Options for the CAM sequential access driver:
# SA_IO_TIMEOUT: Timeout for read/write/wfm  operations, in minutes
# SA_SPACE_TIMEOUT: Timeout for space operations, in minutes
# SA_REWIND_TIMEOUT: Timeout for rewind operations, in minutes
# SA_ERASE_TIMEOUT: Timeout for erase operations, in minutes
# SA_1FM_AT_EOD: Default to model which only has a default one filemark at EOT.
options 	SA_IO_TIMEOUT=4
options 	SA_SPACE_TIMEOUT=60
options 	SA_REWIND_TIMEOUT=(2*60)
options 	SA_ERASE_TIMEOUT=(4*60)
options 	SA_1FM_AT_EOD

# Optional timeout for the CAM processor target (pt) device
# This is specified in seconds.  The default is 60 seconds.
options 	SCSI_PT_DEFAULT_TIMEOUT=60

# Optional enable of doing SES passthrough on other devices (e.g., disks)
#
# Normally disabled because a lot of newer SCSI disks report themselves
# as having SES capabilities, but this can then clot up attempts to build
# a topology with the SES device that's on the box these drives are in....
options 	SES_ENABLE_PASSTHROUGH


#####################################################################
# MISCELLANEOUS DEVICES AND OPTIONS

device		pty		#BSD-style compatibility pseudo ttys
device		nmdm		#back-to-back tty devices
device		md		#Memory/malloc disk
device		snp		#Snoop device - to look at pty/vty/etc..
device		ccd		#Concatenated disk driver
device		firmware	#firmware(9) support

# Kernel side iconv library
options 	LIBICONV

# Size of the kernel message buffer.  Should be N * pagesize.
options 	MSGBUF_SIZE=40960


#####################################################################
# HARDWARE DEVICE CONFIGURATION

# For ISA the required hints are listed.
# EISA, MCA, PCI, CardBus, SD/MMC and pccard are self identifying buses, so
# no hints are needed.

#
# Mandatory devices:
#

# These options are valid for other keyboard drivers as well.
options 	KBD_DISABLE_KEYMAP_LOAD	# refuse to load a keymap
options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev

options 	FB_DEBUG		# Frame buffer debugging

device		splash			# Splash screen and screen saver support

# Various screen savers.
device		blank_saver
device		daemon_saver
device		dragon_saver
device		fade_saver
device		fire_saver
device		green_saver
device		logo_saver
device		rain_saver
device		snake_saver
device		star_saver
device		warp_saver

# The syscons console driver (SCO color console compatible).
device		sc
hint.sc.0.at="isa"
options 	MAXCONS=16		# number of virtual consoles
options 	SC_ALT_MOUSE_IMAGE	# simplified mouse cursor in text mode
options 	SC_DFLT_FONT		# compile font in
makeoptions	SC_DFLT_FONT=cp850
options 	SC_DISABLE_KDBKEY	# disable `debug' key
options 	SC_DISABLE_REBOOT	# disable reboot key sequence
options 	SC_HISTORY_SIZE=200	# number of history buffer lines
options 	SC_MOUSE_CHAR=0x3	# char code for text mode mouse cursor
options 	SC_PIXEL_MODE		# add support for the raster text mode

# The following options will let you change the default colors of syscons.
options 	SC_NORM_ATTR=(FG_GREEN|BG_BLACK)
options 	SC_NORM_REV_ATTR=(FG_YELLOW|BG_GREEN)
options 	SC_KERNEL_CONS_ATTR=(FG_RED|BG_BLACK)
options 	SC_KERNEL_CONS_REV_ATTR=(FG_BLACK|BG_RED)

# The following options will let you change the default behaviour of
# cut-n-paste feature
options 	SC_CUT_SPACES2TABS	# convert leading spaces into tabs
options 	SC_CUT_SEPCHARS=\"x09\"	# set of characters that delimit words
					# (default is single space - \"x20\")

# If you have a two button mouse, you may want to add the following option
# to use the right button of the mouse to paste text.
options 	SC_TWOBUTTON_MOUSE

# You can selectively disable features in syscons.
options 	SC_NO_CUTPASTE
options 	SC_NO_FONT_LOADING
options 	SC_NO_HISTORY
options 	SC_NO_MODE_CHANGE
options 	SC_NO_SYSMOUSE
options 	SC_NO_SUSPEND_VTYSWITCH

# `flags' for sc
#	0x80	Put the video card in the VESA 800x600 dots, 16 color mode
#	0x100	Probe for a keyboard device periodically if one is not present

# Enable experimental features of the syscons terminal emulator (teken).
options 	TEKEN_CONS25		# cons25-style terminal emulation
options 	TEKEN_UTF8		# UTF-8 output handling

#
# Optional devices:
#

#
# SCSI host adapters:
#
# adv: All Narrow SCSI bus AdvanSys controllers.
# adw: Second Generation AdvanSys controllers including the ADV940UW.
# aha: Adaptec 154x/1535/1640
# ahb: Adaptec 174x EISA controllers
# ahc: Adaptec 274x/284x/2910/293x/294x/394x/3950x/3960x/398X/4944/
#      19160x/29160x, aic7770/aic78xx
# ahd: Adaptec 29320/39320 Controllers.
# aic: Adaptec 6260/6360, APA-1460 (PC Card), NEC PC9801-100 (C-BUS)
# amd: Support for the AMD 53C974 SCSI host adapter chip as found on devices
#      such as the Tekram DC-390(T).
# bt:  Most Buslogic controllers: including BT-445, BT-54x, BT-64x, BT-74x,
#      BT-75x, BT-946, BT-948, BT-956, BT-958, SDC3211B, SDC3211F, SDC3222F
# esp: NCR53c9x.  Only for SBUS hardware right now.
# isp: Qlogic ISP 1020, 1040 and 1040B PCI SCSI host adapters,
#      ISP 1240 Dual Ultra SCSI, ISP 1080 and 1280 (Dual) Ultra2,
#      ISP 12160 Ultra3 SCSI,
#      Qlogic ISP 2100 and ISP 2200 1Gb Fibre Channel host adapters.
#      Qlogic ISP 2300 and ISP 2312 2Gb Fibre Channel host adapters.
#      Qlogic ISP 2322 and ISP 6322 2Gb Fibre Channel host adapters.
# ispfw: Firmware module for Qlogic host adapters
# mpt: LSI-Logic MPT/Fusion 53c1020 or 53c1030 Ultra4
#      or FC9x9 Fibre Channel host adapters.
# ncr: NCR 53C810, 53C825 self-contained SCSI host adapters.
# sym: Symbios/Logic 53C8XX family of PCI-SCSI I/O processors:
#      53C810, 53C810A, 53C815, 53C825,  53C825A, 53C860, 53C875,
#      53C876, 53C885,  53C895, 53C895A, 53C896,  53C897, 53C1510D,
#      53C1010-33, 53C1010-66.
# trm: Tekram DC395U/UW/F DC315U adapters.
# wds: WD7000

#
# Note that the order is important in order for Buslogic ISA/EISA cards to be
# probed correctly.
#
device		bt
hint.bt.0.at="isa"
hint.bt.0.port="0x330"
device		adv
hint.adv.0.at="isa"
device		adw
device		aha
hint.aha.0.at="isa"
device		aic
hint.aic.0.at="isa"
device		ahb
device		ahc
device		ahd
device		amd
device		esp
device		iscsi_initiator
device		isp
hint.isp.0.disable="1"
hint.isp.0.role="3"
hint.isp.0.prefer_iomap="1"
hint.isp.0.prefer_memmap="1"
hint.isp.0.fwload_disable="1"
hint.isp.0.ignore_nvram="1"
hint.isp.0.fullduplex="1"
hint.isp.0.topology="lport"
hint.isp.0.topology="nport"
hint.isp.0.topology="lport-only"
hint.isp.0.topology="nport-only"
# we can't get u_int64_t types, nor can we get strings if it's got
# a leading 0x, hence this silly dodge.
hint.isp.0.portwnn="w50000000aaaa0000"
hint.isp.0.nodewnn="w50000000aaaa0001"
device		ispfw
device		mpt
device		ncr
device		sym
device		trm
device		wds
hint.wds.0.at="isa"
hint.wds.0.port="0x350"
hint.wds.0.irq="11"
hint.wds.0.drq="6"

# The aic7xxx driver will attempt to use memory mapped I/O for all PCI
# controllers that have it configured only if this option is set. Unfortunately,
# this doesn't work on some motherboards, which prevents it from being the
# default.
options 	AHC_ALLOW_MEMIO

# Dump the contents of the ahc controller configuration PROM.
options 	AHC_DUMP_EEPROM

# Bitmap of units to enable targetmode operations.
options 	AHC_TMODE_ENABLE

# Compile in Aic7xxx Debugging code.
options 	AHC_DEBUG

# Aic7xxx driver debugging options. See sys/dev/aic7xxx/aic7xxx.h
options 	AHC_DEBUG_OPTS

# Print register bitfields in debug output.  Adds ~128k to driver
# See ahc(4).
options 	AHC_REG_PRETTY_PRINT

# Compile in aic79xx debugging code.
options 	AHD_DEBUG

# Aic79xx driver debugging options.  Adds ~215k to driver.  See ahd(4).
options 	AHD_DEBUG_OPTS=0xFFFFFFFF

# Print human-readable register definitions when debugging
options 	AHD_REG_PRETTY_PRINT

# Bitmap of units to enable targetmode operations.
options 	AHD_TMODE_ENABLE

# The adw driver will attempt to use memory mapped I/O for all PCI
# controllers that have it configured only if this option is set.
options 	ADW_ALLOW_MEMIO

# Options used in dev/iscsi (Software iSCSI stack)
#
options 	ISCSI_INITIATOR_DEBUG=9

# Options used in dev/isp/ (Qlogic SCSI/FC driver).
#
#	ISP_TARGET_MODE		-	enable target mode operation
#
options 	ISP_TARGET_MODE=1
#
#	ISP_DEFAULT_ROLES	-	default role
#		none=0
#		target=1
#		initiator=2
#		both=3			(not supported currently)
#
options 	ISP_DEFAULT_ROLES=2

# Options used in dev/sym/ (Symbios SCSI driver).
#options 	SYM_SETUP_LP_PROBE_MAP	#-Low Priority Probe Map (bits)
					# Allows the ncr to take precedence
					# 1 (1<<0) -> 810a, 860
					# 2 (1<<1) -> 825a, 875, 885, 895
					# 4 (1<<2) -> 895a, 896, 1510d
#options 	SYM_SETUP_SCSI_DIFF	#-HVD support for 825a, 875, 885
					# disabled:0 (default), enabled:1
#options 	SYM_SETUP_PCI_PARITY	#-PCI parity checking
					# disabled:0, enabled:1 (default)
#options 	SYM_SETUP_MAX_LUN	#-Number of LUNs supported
					# default:8, range:[1..64]

# The 'dpt' driver provides support for old DPT controllers (http://www.dpt.com/).
# These have hardware RAID-{0,1,5} support, and do multi-initiator I/O.
# The DPT controllers are commonly re-licensed under other brand-names -
# some controllers by Olivetti, Dec, HP, AT&T, SNI, AST, Alphatronic, NEC and
# Compaq are actually DPT controllers.
#
# See src/sys/dev/dpt for debugging and other subtle options.
#   DPT_MEASURE_PERFORMANCE Enables a set of (semi)invasive metrics. Various
#                           instruments are enabled.  The tools in
#                           /usr/sbin/dpt_* assume these to be enabled.
#   DPT_HANDLE_TIMEOUTS     Normally device timeouts are handled by the DPT.
#                           If you want the driver to handle timeouts, enable
#                           this option.  If your system is very busy, this
#                           option will create more trouble than solve.
#   DPT_TIMEOUT_FACTOR      Used to compute the excessive amount of time to
#                           wait when timing out with the above option.
#  DPT_DEBUG_xxxx           These are controllable from sys/dev/dpt/dpt.h
#  DPT_LOST_IRQ             When enabled, will try, once per second, to catch
#                           any interrupt that got lost.  Seems to help in some
#                           DPT-firmware/Motherboard combinations.  Minimal
#                           cost, great benefit.
#  DPT_RESET_HBA            Make "reset" actually reset the controller
#                           instead of fudging it.  Only enable this if you
#			    are 100% certain you need it.

device		dpt

# DPT options
#!CAM# options 	DPT_MEASURE_PERFORMANCE
#!CAM# options 	DPT_HANDLE_TIMEOUTS
options 	DPT_TIMEOUT_FACTOR=4
options 	DPT_LOST_IRQ
options 	DPT_RESET_HBA

#
# Compaq "CISS" RAID controllers (SmartRAID 5* series)
# These controllers have a SCSI-like interface, and require the
# CAM infrastructure.
#
device		ciss

#
# Intel Integrated RAID controllers.
# This driver was developed and is maintained by Intel.  Contacts
# at Intel for this driver are
# "Kannanthanam, Boji T" <boji.t.kannanthanam@intel.com> and
# "Leubner, Achim" <achim.leubner@intel.com>.
#
device		iir

#
# Mylex AcceleRAID and eXtremeRAID controllers with v6 and later
# firmware.  These controllers have a SCSI-like interface, and require
# the CAM infrastructure.
#
device		mly

#
# Compaq Smart RAID, Mylex DAC960 and AMI MegaRAID controllers.  Only
# one entry is needed; the code will find and configure all supported
# controllers.
#
device		ida		# Compaq Smart RAID
device		mlx		# Mylex DAC960
device		amr		# AMI MegaRAID
device		amrp		# SCSI Passthrough interface (optional, CAM req.)
device		mfi		# LSI MegaRAID SAS
device		mfip		# LSI MegaRAID SAS passthrough, requires CAM
options 	MFI_DEBUG

#
# 3ware ATA RAID
#
device		twe		# 3ware ATA RAID

#
# Serial ATA host controllers:
#
# ahci: Advanced Host Controller Interface (AHCI) compatible
# mvs:  Marvell 88SX50XX/88SX60XX/88SX70XX/SoC controllers
# siis: SiliconImage SiI3124/SiI3132/SiI3531 controllers
#
# These drivers are part of cam(4) subsystem. They supersede less featured
# ata(4) subsystem drivers, supporting same hardware.

device		ahci
device		mvs
device		siis

#
# The 'ATA' driver supports all ATA and ATAPI devices, including PC Card
# devices. You only need one "device ata" for it to find all
# PCI and PC Card ATA/ATAPI devices on modern machines.
# Alternatively, individual bus and chipset drivers may be chosen by using
# the 'atacore' driver then selecting the drivers on a per vendor basis.
# For example to build a system which only supports a VIA chipset,
# omit 'ata' and include the 'atacore', 'atapci' and 'atavia' drivers.
device		ata
device		atadisk		# ATA disk drives
device		ataraid		# ATA RAID drives
device		atapicd		# ATAPI CDROM drives
device		atapifd		# ATAPI floppy drives
device		atapist		# ATAPI tape drives
device		atapicam	# emulate ATAPI devices as SCSI ditto via CAM
				# needs CAM to be present (scbus & pass)

# Modular ATA
#device		atacore		# Core ATA functionality
#device		atacard		# CARDBUS support
#device		atabus		# PC98 cbus support
#device		ataisa		# ISA bus support
#device		atapci		# PCI bus support; only generic chipset support

# PCI ATA chipsets
#device		ataahci		# AHCI SATA
#device		ataacard	# ACARD
#device		ataacerlabs	# Acer Labs Inc. (ALI)
#device		ataadaptec	# Adaptec
#device		ataamd		# American Micro Devices (AMD)
#device		ataati		# ATI
#device		atacenatek	# Cenatek
#device		atacypress	# Cypress
#device		atacyrix	# Cyrix
#device		atahighpoint	# HighPoint
#device		ataintel	# Intel
#device		ataite		# Integrated Technology Inc. (ITE)
#device		atajmicron	# JMicron
#device		atamarvell	# Marvell
#device		atamicron	# Micron
#device		atanational	# National
#device		atanetcell	# NetCell
#device		atanvidia	# nVidia
#device		atapromise	# Promise
#device		ataserverworks	# ServerWorks
#device		atasiliconimage	# Silicon Image Inc. (SiI) (formerly CMD)
#device		atasis		# Silicon Integrated Systems Corp.(SiS)
#device		atavia		# VIA Technologies Inc.

#
# For older non-PCI, non-PnPBIOS systems, these are the hints lines to add:
hint.ata.0.at="isa"
hint.ata.0.port="0x1f0"
hint.ata.0.irq="14"
hint.ata.1.at="isa"
hint.ata.1.port="0x170"
hint.ata.1.irq="15"

#
# The following options are valid on the ATA driver:
#
# ATA_STATIC_ID:	controller numbering is static ie depends on location
#			else the device numbers are dynamically allocated.
# ATA_REQUEST_TIMEOUT:	the number of seconds to wait for an ATA request
#			before timing out.
# ATA_CAM:		Turn ata(4) subsystem controller drivers into cam(4)
#			interface modules. This deprecates all ata(4)
#			peripheral device drivers (atadisk, ataraid, atapicd,
#			atapifd, atapist, atapicam) and all user-level APIs.
#			cam(4) drivers and APIs will be connected instead.

options 	ATA_STATIC_ID
#options 	ATA_REQUEST_TIMEOUT=10
#options 	ATA_CAM

#
# Standard floppy disk controllers and floppy tapes, supports
# the Y-E DATA External FDD (PC Card)
#
device		fdc
hint.fdc.0.at="isa"
hint.fdc.0.port="0x3F0"
hint.fdc.0.irq="6"
hint.fdc.0.drq="2"
#
# FDC_DEBUG enables floppy debugging.  Since the debug output is huge, you
# gotta turn it actually on by setting the variable fd_debug with DDB,
# however.
options 	FDC_DEBUG
#
# Activate this line if you happen to have an Insight floppy tape.
# Probing them proved to be dangerous for people with floppy disks only,
# so it's "hidden" behind a flag:
#hint.fdc.0.flags="1"

# Specify floppy devices
hint.fd.0.at="fdc0"
hint.fd.0.drive="0"
hint.fd.1.at="fdc0"
hint.fd.1.drive="1"

#
# uart: newbusified driver for serial interfaces.  It consolidates the sio(4),
#	sab(4) and zs(4) drivers.
#
device		uart

# Options for uart(4)
options 	UART_PPS_ON_CTS		# Do time pulse capturing using CTS
					# instead of DCD.

# The following hint should only be used for pure ISA devices.  It is not
# needed otherwise.  Use of hints is strongly discouraged.
hint.uart.0.at="isa"

# The following 3 hints are used when the UART is a system device (i.e., a
# console or debug port), but only on platforms that don't have any other
# means to pass the information to the kernel.  The unit number of the hint
# is only used to bundle the hints together.  There is no relation to the
# unit number of the probed UART.
hint.uart.0.port="0x3f8"
hint.uart.0.flags="0x10"
hint.uart.0.baud="115200"

# `flags' for serial drivers that support consoles like sio(4) and uart(4):
#	0x10	enable console support for this unit.  Other console flags
#		(if applicable) are ignored unless this is set.  Enabling
#		console support does not make the unit the preferred console.
#		Boot with -h or set boot_serial=YES in the loader.  For sio(4)
#		specifically, the 0x20 flag can also be set (see above).
#		Currently, at most one unit can have console support; the
#		first one (in config file order) with this flag set is
#		preferred.  Setting this flag for sio0 gives the old behaviour.
#	0x80	use this port for serial line gdb support in ddb.  Also known
#		as debug port.
#

# Options for serial drivers that support consoles:
options 	BREAK_TO_DEBUGGER	# A BREAK on a serial console goes to
					# ddb, if available.

# Solaris implements a new BREAK which is initiated by a character
# sequence CR ~ ^b which is similar to a familiar pattern used on
# Sun servers by the Remote Console.  There are FreeBSD extensions:
# CR ~ ^p requests force panic and CR ~ ^r requests a clean reboot.
options 	ALT_BREAK_TO_DEBUGGER

# Serial Communications Controller
# Supports the Siemens SAB 82532 and Zilog Z8530 multi-channel
# communications controllers.
device		scc

# PCI Universal Communications driver
# Supports various multi port PCI I/O cards.
device		puc

#
# Network interfaces:
#
# MII bus support is required for many PCI Ethernet NICs,
# namely those which use MII-compliant transceivers or implement
# transceiver control interfaces that operate like an MII.  Adding
# "device miibus" to the kernel config pulls in support for
# the generic miibus API and all of the PHY drivers, including a
# generic one for PHYs that aren't specifically handled by an
# individual driver.  Support for specific PHYs may be built by adding
# "device mii" then adding the appropriate PHY driver.
device  	miibus		# MII support including all PHYs
device  	mii		# Minimal MII support

device  	acphy		# Altima Communications AC101
device  	amphy		# AMD AM79c873 / Davicom DM910{1,2}
device  	atphy		# Attansic/Atheros F1
device  	axphy		# Asix Semiconductor AX88x9x
device  	bmtphy		# Broadcom BCM5201/BCM5202 and 3Com 3c905C
device  	brgphy		# Broadcom BCM54xx/57xx 1000baseTX
device  	ciphy		# Cicada/Vitesse CS/VSC8xxx
device  	e1000phy	# Marvell 88E1000 1000/100/10-BT
device  	exphy		# 3Com internal PHY
device  	gentbi		# Generic 10-bit 1000BASE-{LX,SX} fiber ifaces
device  	icsphy		# ICS ICS1889-1893
device  	inphy		# Intel 82553/82555
device  	ip1000phy	# IC Plus IP1000A/IP1001
device  	jmphy		# JMicron JMP211/JMP202
device  	lxtphy		# Level One LXT-970
device  	mlphy		# Micro Linear 6692
device  	nsgphy		# NatSemi DP8361/DP83865/DP83891
device  	nsphy		# NatSemi DP83840A
device  	nsphyter	# NatSemi DP83843/DP83815
device  	pnaphy		# HomePNA
device  	qsphy		# Quality Semiconductor QS6612
device  	rgephy		# RealTek 8169S/8110S/8211B/8211C
device  	rlphy		# RealTek 8139
device  	rlswitch	# RealTek 8305
device  	ruephy		# RealTek RTL8150
device  	smcphy		# SMSC LAN91C111
device  	tdkphy		# TDK 89Q2120
device  	tlphy		# Texas Instruments ThunderLAN
device  	truephy		# LSI TruePHY
device		xmphy		# XaQti XMAC II

# an:   Aironet 4500/4800 802.11 wireless adapters. Supports the PCMCIA,
#       PCI and ISA varieties.
# ae:   Support for gigabit ethernet adapters based on the Attansic/Atheros
#       L2 PCI-Express FastEthernet controllers.
# age:  Support for gigabit ethernet adapters based on the Attansic/Atheros
#       L1 PCI express gigabit ethernet controllers.
# alc:  Support for Atheros AR8131/AR8132 PCIe ethernet controllers.
# ale:  Support for Atheros AR8121/AR8113/AR8114 PCIe ethernet controllers.
# ath:  Atheros a/b/g WiFi adapters (requires ath_hal and wlan)
# bce:	Broadcom NetXtreme II (BCM5706/BCM5708) PCI/PCIe Gigabit Ethernet
#       adapters.
# bfe:	Broadcom BCM4401 Ethernet adapter.
# bge:	Support for gigabit ethernet adapters based on the Broadcom
#	BCM570x family of controllers, including the 3Com 3c996-T,
#	the Netgear GA302T, the SysKonnect SK-9D21 and SK-9D41, and
#	the embedded gigE NICs on Dell PowerEdge 2550 servers.
# bwi:	Broadcom BCM430* and BCM431* family of wireless adapters.
# bwn:	Broadcom BCM43xx family of wireless adapters.
# cas:	Sun Cassini/Cassini+ and National Semiconductor DP83065 Saturn
# cm:	Arcnet SMC COM90c26 / SMC COM90c56
#	(and SMC COM90c66 in '56 compatibility mode) adapters.
# dc:   Support for PCI fast ethernet adapters based on the DEC/Intel 21143
#       and various workalikes including:
#       the ADMtek AL981 Comet and AN985 Centaur, the ASIX Electronics
#       AX88140A and AX88141, the Davicom DM9100 and DM9102, the Lite-On
#       82c168 and 82c169 PNIC, the Lite-On/Macronix LC82C115 PNIC II
#       and the Macronix 98713/98713A/98715/98715A/98725 PMAC. This driver
#       replaces the old al, ax, dm, pn and mx drivers.  List of brands:
#       Digital DE500-BA, Kingston KNE100TX, D-Link DFE-570TX, SOHOware SFA110,
#       SVEC PN102-TX, CNet Pro110B, 120A, and 120B, Compex RL100-TX,
#       LinkSys LNE100TX, LNE100TX V2.0, Jaton XpressNet, Alfa Inc GFC2204,
#       KNE110TX.
# de:   Digital Equipment DC21040
# em:   Intel Pro/1000 Gigabit Ethernet 82542, 82543, 82544 based adapters.
# igb:  Intel Pro/1000 PCI Express Gigabit Ethernet: 82575 and later adapters.
# ep:   3Com 3C509, 3C529, 3C556, 3C562D, 3C563D, 3C572, 3C574X, 3C579, 3C589
#       and PC Card devices using these chipsets.
# ex:   Intel EtherExpress Pro/10 and other i82595-based adapters,
#       Olicom Ethernet PC Card devices.
# fe:   Fujitsu MB86960A/MB86965A Ethernet
# fea:  DEC DEFEA EISA FDDI adapter
# fpa:  Support for the Digital DEFPA PCI FDDI. `device fddi' is also needed.
# fxp:  Intel EtherExpress Pro/100B
#	(hint of prefer_iomap can be done to prefer I/O instead of Mem mapping)
# gem:  Apple GMAC/Sun ERI/Sun GEM
# hme:  Sun HME (Happy Meal Ethernet)
# jme:  JMicron JMC260 Fast Ethernet/JMC250 Gigabit Ethernet based adapters.
# le:   AMD Am7900 LANCE and Am79C9xx PCnet
# lge:	Support for PCI gigabit ethernet adapters based on the Level 1
#	LXT1001 NetCellerator chipset. This includes the D-Link DGE-500SX,
#	SMC TigerCard 1000 (SMC9462SX), and some Addtron cards.
# msk:	Support for gigabit ethernet adapters based on the Marvell/SysKonnect
#	Yukon II Gigabit controllers, including 88E8021, 88E8022, 88E8061,
#	88E8062, 88E8035, 88E8036, 88E8038, 88E8050, 88E8052, 88E8053,
#	88E8055, 88E8056 and D-Link 560T/550SX.
# lmc:	Support for the LMC/SBE wide-area network interface cards.
# my:	Myson Fast Ethernet (MTD80X, MTD89X)
# nge:	Support for PCI gigabit ethernet adapters based on the National
#	Semiconductor DP83820 and DP83821 chipset. This includes the
#	SMC EZ Card 1000 (SMC9462TX), D-Link DGE-500T, Asante FriendlyNet
#	GigaNIX 1000TA and 1000TPC, the Addtron AEG320T, the Surecom
#	EP-320G-TX and the Netgear GA622T.
# pcn:	Support for PCI fast ethernet adapters based on the AMD Am79c97x
#	PCnet-FAST, PCnet-FAST+, PCnet-FAST III, PCnet-PRO and PCnet-Home
#	chipsets. These can also be handled by the le(4) driver if the
#	pcn(4) driver is left out of the kernel. The le(4) driver does not
#	support the additional features like the MII bus and burst mode of
#	the PCnet-FAST and greater chipsets though.
# ral:	Ralink Technology IEEE 802.11 wireless adapter
# re:   RealTek 8139C+/8169/816xS/811xS/8101E PCI/PCIe Ethernet adapter
# rl:   Support for PCI fast ethernet adapters based on the RealTek 8129/8139
#       chipset.  Note that the RealTek driver defaults to using programmed
#       I/O to do register accesses because memory mapped mode seems to cause
#       severe lockups on SMP hardware.  This driver also supports the
#       Accton EN1207D `Cheetah' adapter, which uses a chip called
#       the MPX 5030/5038, which is either a RealTek in disguise or a
#       RealTek workalike.  Note that the D-Link DFE-530TX+ uses the RealTek
#       chipset and is supported by this driver, not the 'vr' driver.
# sf:   Support for Adaptec Duralink PCI fast ethernet adapters based on the
#       Adaptec AIC-6915 "starfire" controller.
#       This includes dual and quad port cards, as well as one 100baseFX card.
#       Most of these are 64-bit PCI devices, except for one single port
#       card which is 32-bit.
# sge:  Silicon Integrated Systems SiS190/191 Fast/Gigabit Ethernet adapter
# sis:  Support for NICs based on the Silicon Integrated Systems SiS 900,
#       SiS 7016 and NS DP83815 PCI fast ethernet controller chips.
# sk:   Support for the SysKonnect SK-984x series PCI gigabit ethernet NICs.
#       This includes the SK-9841 and SK-9842 single port cards (single mode
#       and multimode fiber) and the SK-9843 and SK-9844 dual port cards
#       (also single mode and multimode).
#       The driver will autodetect the number of ports on the card and
#       attach each one as a separate network interface.
# sn:   Support for ISA and PC Card Ethernet devices using the
#       SMC91C90/92/94/95 chips.
# ste:  Sundance Technologies ST201 PCI fast ethernet controller, includes
#       the D-Link DFE-550TX.
# stge: Support for gigabit ethernet adapters based on the Sundance/Tamarack
#       TC9021 family of controllers, including the Sundance ST2021/ST2023,
#       the Sundance/Tamarack TC9021, the D-Link DL-4000 and ASUS NX1101.
# ti:   Support for PCI gigabit ethernet NICs based on the Alteon Networks
#       Tigon 1 and Tigon 2 chipsets.  This includes the Alteon AceNIC, the
#       3Com 3c985, the Netgear GA620 and various others.  Note that you will
#       probably want to bump up kern.ipc.nmbclusters a lot to use this driver.
# tl:   Support for the Texas Instruments TNETE100 series 'ThunderLAN'
#       cards and integrated ethernet controllers.  This includes several
#       Compaq Netelligent 10/100 cards and the built-in ethernet controllers
#       in several Compaq Prosignia, Proliant and Deskpro systems.  It also
#       supports several Olicom 10Mbps and 10/100 boards.
# tx:   SMC 9432 TX, BTX and FTX cards. (SMC EtherPower II series)
# txp:	Support for 3Com 3cR990 cards with the "Typhoon" chipset
# vr:   Support for various fast ethernet adapters based on the VIA
#       Technologies VT3043 `Rhine I' and VT86C100A `Rhine II' chips,
#       including the D-Link DFE520TX and D-Link DFE530TX (see 'rl' for
#       DFE530TX+), the Hawking Technologies PN102TX, and the AOpen/Acer ALN-320.
# vx:   3Com 3C590 and 3C595
# wb:   Support for fast ethernet adapters based on the Winbond W89C840F chip.
#       Note: this is not the same as the Winbond W89C940F, which is a
#       NE2000 clone.
# wi:   Lucent WaveLAN/IEEE 802.11 PCMCIA adapters. Note: this supports both
#       the PCMCIA and ISA cards: the ISA card is really a PCMCIA to ISA
#       bridge with a PCMCIA adapter plugged into it.
# xe:   Xircom/Intel EtherExpress Pro100/16 PC Card ethernet controller,
#       Accton Fast EtherCard-16, Compaq Netelligent 10/100 PC Card,
#       Toshiba 10/100 Ethernet PC Card, Xircom 16-bit Ethernet + Modem 56
# xl:   Support for the 3Com 3c900, 3c905, 3c905B and 3c905C (Fast)
#       Etherlink XL cards and integrated controllers.  This includes the
#       integrated 3c905B-TX chips in certain Dell Optiplex and Dell
#       Precision desktop machines and the integrated 3c905-TX chips
#       in Dell Latitude laptop docking stations.
#       Also supported: 3Com 3c980(C)-TX, 3Com 3cSOHO100-TX, 3Com 3c450-TX

# Order for ISA/EISA devices is important here

device		cm
hint.cm.0.at="isa"
hint.cm.0.port="0x2e0"
hint.cm.0.irq="9"
hint.cm.0.maddr="0xdc000"
device		ep
device		ex
device		fe
hint.fe.0.at="isa"
hint.fe.0.port="0x300"
device		fea
device		sn
hint.sn.0.at="isa"
hint.sn.0.port="0x300"
hint.sn.0.irq="10"
device		an
device		wi
device		xe

# PCI Ethernet NICs that use the common MII bus controller code.
device		ae		# Attansic/Atheros L2 FastEthernet
device		age		# Attansic/Atheros L1 Gigabit Ethernet
device		alc		# Atheros AR8131/AR8132 Ethernet
device		ale		# Atheros AR8121/AR8113/AR8114 Ethernet
device		bce		# Broadcom BCM5706/BCM5708 Gigabit Ethernet
device		bfe		# Broadcom BCM440x 10/100 Ethernet
device		bge		# Broadcom BCM570xx Gigabit Ethernet
device		cas		# Sun Cassini/Cassini+ and NS DP83065 Saturn
device		cxgb		# Chelsio T3 10 Gigabit Ethernet
device		cxgb_t3fw	# Chelsio T3 10 Gigabit Ethernet firmware
device		dc		# DEC/Intel 21143 and various workalikes
device		et		# Agere ET1310 10/100/Gigabit Ethernet
device		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
hint.fxp.0.prefer_iomap="0"
device		gem		# Apple GMAC/Sun ERI/Sun GEM
device		hme		# Sun HME (Happy Meal Ethernet)
device		jme		# JMicron JMC250 Gigabit/JMC260 Fast Ethernet
device		lge		# Level 1 LXT1001 gigabit Ethernet
device		msk		# Marvell/SysKonnect Yukon II Gigabit Ethernet
device		my		# Myson Fast Ethernet (MTD80X, MTD89X)
device		nge		# NatSemi DP83820 gigabit Ethernet
device		re		# RealTek 8139C+/8169/8169S/8110S
device		rl		# RealTek 8129/8139
device		pcn		# AMD Am79C97x PCI 10/100 NICs
device		sf		# Adaptec AIC-6915 (``Starfire'')
device		sge		# Silicon Integrated Systems SiS190/191
device		sis		# Silicon Integrated Systems SiS 900/SiS 7016
device		sk		# SysKonnect SK-984x & SK-982x gigabit Ethernet
device		ste		# Sundance ST201 (D-Link DFE-550TX)
device		stge		# Sundance/Tamarack TC9021 gigabit Ethernet
device		tl		# Texas Instruments ThunderLAN
device		tx		# SMC EtherPower II (83c170 ``EPIC'')
device		vr		# VIA Rhine, Rhine II
device		wb		# Winbond W89C840F
device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')

# PCI Ethernet NICs.
device		de		# DEC/Intel DC21x4x (``Tulip'')
device		em		# Intel Pro/1000 Gigabit Ethernet
device		igb		# Intel Pro/1000 PCIE Gigabit Ethernet
device		ixgb		# Intel Pro/10Gbe PCI-X Ethernet
device		ixgbe		# Intel Pro/10Gbe PCIE Ethernet
device		le		# AMD Am7900 LANCE and Am79C9xx PCnet
device		mxge		# Myricom Myri-10G 10GbE NIC
device		nxge		# Neterion Xframe 10GbE Server/Storage Adapter
device		ti		# Alteon Networks Tigon I/II gigabit Ethernet
device		txp		# 3Com 3cR990 (``Typhoon'')
device		vx		# 3Com 3c590, 3c595 (``Vortex'')

# PCI FDDI NICs.
device		fpa

# PCI WAN adapters.
device		lmc

# PCI IEEE 802.11 Wireless NICs
device		ath		# Atheros pci/cardbus NIC's
device		ath_hal		# pci/cardbus chip support
#device		ath_ar5210	# AR5210 chips
#device		ath_ar5211	# AR5211 chips
#device		ath_ar5212	# AR5212 chips
#device		ath_rf2413
#device		ath_rf2417
#device		ath_rf2425
#device		ath_rf5111
#device		ath_rf5112
#device		ath_rf5413
#device		ath_ar5416	# AR5416 chips
options 	AH_SUPPORT_AR5416	# enable AR5416 tx/rx descriptors
# All of the AR5212 parts have a problem when paired with the AR71xx
# CPUS.  These parts have a bug that triggers a fatal bus error on the AR71xx
# only.  Details of the exact nature of the bug are sketchy, but some can be
# found at https://forum.openwrt.org/viewtopic.php?pid=70060 on pages 4, 5 and
# 6.  This option enables this workaround.  There is a performance penalty
# for this work around, but without it things don't work at all.  The DMA
# from the card usually bursts 128 bytes, but on the affected CPUs, only
# 4 are safe.
options	   	AH_RXCFG_SDMAMW_4BYTES
#device		ath_ar9160	# AR9160 chips
#device		ath_ar9280	# AR9280 chips
#device		ath_ar9285	# AR9285 chips
device		ath_rate_sample	# SampleRate tx rate control for ath
device		bwi		# Broadcom BCM430* BCM431*
device		bwn		# Broadcom BCM43xx
device		ral		# Ralink Technology RT2500 wireless NICs.

# Use "private" jumbo buffers allocated exclusively for the ti(4) driver.
# This option is incompatible with the TI_JUMBO_HDRSPLIT option below.
#options 	TI_PRIVATE_JUMBOS
# Turn on the header splitting option for the ti(4) driver firmware.  This
# only works for Tigon II chips, and has no effect for Tigon I chips.
options 	TI_JUMBO_HDRSPLIT

#
# Use header splitting feature on bce(4) adapters.
# This may help to reduce the amount of jumbo-sized memory buffers used.
#
options		BCE_JUMBO_HDRSPLIT

# These two options allow manipulating the mbuf cluster size and mbuf size,
# respectively.  Be very careful with NIC driver modules when changing
# these from their default values, because that can potentially cause a
# mismatch between the mbuf size assumed by the kernel and the mbuf size
# assumed by a module.  The only driver that currently has the ability to
# detect a mismatch is ti(4).
options 	MCLSHIFT=12	# mbuf cluster shift in bits, 12 == 4KB
options 	MSIZE=512	# mbuf size in bytes

#
# ATM related options (Cranor version)
# (note: this driver cannot be used with the HARP ATM stack)
#
# The `en' device provides support for Efficient Networks (ENI)
# ENI-155 PCI midway cards, and the Adaptec 155Mbps PCI ATM cards (ANA-59x0).
#
# The `hatm' device provides support for Fore/Marconi HE155 and HE622
# ATM PCI cards.
#
# The `fatm' device provides support for Fore PCA200E ATM PCI cards.
#
# The `patm' device provides support for IDT77252 based cards like
# ProSum's ProATM-155 and ProATM-25 and IDT's evaluation boards.
#
# atm device provides generic atm functions and is required for
# atm devices.
# NATM enables the netnatm protocol family that can be used to
# bypass TCP/IP.
#
# utopia provides the access to the ATM PHY chips and is required for en,
# hatm and fatm.
#
# the current driver supports only PVC operations (no atm-arp, no multicast).
# for more details, please read the original documents at
# http://www.ccrc.wustl.edu/pub/chuck/tech/bsdatm/bsdatm.html
#
device		atm
device		en
device		fatm			#Fore PCA200E
device		hatm			#Fore/Marconi HE155/622
device		patm			#IDT77252 cards (ProATM and IDT)
device		utopia			#ATM PHY driver
#options 	NATM			#native ATM

options 	LIBMBPOOL		#needed by patm, iatm

#
# Sound drivers
#
# sound: The generic sound driver.
#

device		sound

#
# snd_*: Device-specific drivers.
#
# The flags of the device tell the device a bit more info about the
# device that normally is obtained through the PnP interface.
#	bit  2..0   secondary DMA channel;
#	bit  4      set if the board uses two dma channels;
#	bit 15..8   board type, overrides autodetection; leave it
#		    zero if don't know what to put in (and you don't,
#		    since this is unsupported at the moment...).
#
# snd_ad1816:		Analog Devices AD1816 ISA PnP/non-PnP.
# snd_als4000:		Avance Logic ALS4000 PCI.
# snd_atiixp:		ATI IXP 200/300/400 PCI.
# snd_audiocs:		Crystal Semiconductor CS4231 SBus/EBus. Only
#			for sparc64.
# snd_cmi:		CMedia CMI8338/CMI8738 PCI.
# snd_cs4281:		Crystal Semiconductor CS4281 PCI.
# snd_csa:		Crystal Semiconductor CS461x/428x PCI. (except
#			4281)
# snd_ds1:		Yamaha DS-1 PCI.
# snd_emu10k1:		Creative EMU10K1 PCI and EMU10K2 (Audigy) PCI.
# snd_emu10kx:		Creative SoundBlaster Live! and Audigy
# snd_envy24:		VIA Envy24 and compatible, needs snd_spicds.
# snd_envy24ht:		VIA Envy24HT and compatible, needs snd_spicds.
# snd_es137x:		Ensoniq AudioPCI ES137x PCI.
# snd_ess:		Ensoniq ESS ISA PnP/non-PnP, to be used in
#			conjunction with snd_sbc.
# snd_fm801:		Forte Media FM801 PCI.
# snd_gusc:		Gravis UltraSound ISA PnP/non-PnP.
# snd_hda:		Intel High Definition Audio (Controller) and
#			compatible.
# snd_ich:		Intel ICH AC'97 and some more audio controllers
#			embedded in a chipset, for example nVidia
#			nForce controllers.
# snd_maestro:		ESS Technology Maestro-1/2x PCI.
# snd_maestro3:		ESS Technology Maestro-3/Allegro PCI.
# snd_mss:		Microsoft Sound System ISA PnP/non-PnP.
# snd_neomagic:		Neomagic 256 AV/ZX PCI.
# snd_sb16:		Creative SoundBlaster16, to be used in
#			conjunction with snd_sbc.
# snd_sb8:		Creative SoundBlaster (pre-16), to be used in
#			conjunction with snd_sbc.
# snd_sbc:		Creative SoundBlaster ISA PnP/non-PnP.
#			Supports ESS and Avance ISA chips as well.
# snd_spicds:		SPI codec driver, needed by Envy24/Envy24HT drivers.
# snd_solo:		ESS Solo-1x PCI.
# snd_t4dwave:		Trident 4DWave DX/NX PCI, Sis 7018 PCI and Acer Labs
#			M5451 PCI.
# snd_via8233:		VIA VT8233x PCI.
# snd_via82c686:	VIA VT82C686A PCI.
# snd_vibes:		S3 Sonicvibes PCI.
# snd_uaudio:		USB audio.

device		snd_ad1816
device		snd_als4000
device		snd_atiixp
#device		snd_audiocs
device		snd_cmi
device		snd_cs4281
device		snd_csa
device		snd_ds1
device		snd_emu10k1
device		snd_emu10kx
device		snd_envy24
device		snd_envy24ht
device		snd_es137x
device		snd_ess
device		snd_fm801
device		snd_gusc
device		snd_hda
device		snd_ich
device		snd_maestro
device		snd_maestro3
device		snd_mss
device		snd_neomagic
device		snd_sb16
device		snd_sb8
device		snd_sbc
device		snd_solo
device		snd_spicds
device		snd_t4dwave
device		snd_via8233
device		snd_via82c686
device		snd_vibes
device		snd_uaudio

# For non-PnP sound cards:
hint.pcm.0.at="isa"
hint.pcm.0.irq="10"
hint.pcm.0.drq="1"
hint.pcm.0.flags="0x0"
hint.sbc.0.at="isa"
hint.sbc.0.port="0x220"
hint.sbc.0.irq="5"
hint.sbc.0.drq="1"
hint.sbc.0.flags="0x15"
hint.gusc.0.at="isa"
hint.gusc.0.port="0x220"
hint.gusc.0.irq="5"
hint.gusc.0.drq="1"
hint.gusc.0.flags="0x13"

#
# Following options are intended for debugging/testing purposes:
#
# SND_DEBUG                    Enable extra debugging code that includes
#                              sanity checking and possible increase of
#                              verbosity.
#
# SND_DIAGNOSTIC               Simmilar in a spirit of INVARIANTS/DIAGNOSTIC,
#                              zero tolerance against inconsistencies.
#
# SND_FEEDER_MULTIFORMAT       By default, only 16/32 bit feeders are compiled
#                              in. This options enable most feeder converters
#                              except for 8bit. WARNING: May bloat the kernel.
#
# SND_FEEDER_FULL_MULTIFORMAT  Ditto, but includes 8bit feeders as well.
#
# SND_FEEDER_RATE_HP           (feeder_rate) High precision 64bit arithmetic
#                              as much as possible (the default trying to
#                              avoid it). Possible slowdown.
#
# SND_PCM_64                   (Only applicable for i386/32bit arch)
#                              Process 32bit samples through 64bit
#                              integer/arithmetic. Slight increase of dynamic
#                              range at a cost of possible slowdown.
#
# SND_OLDSTEREO                Only 2 channels are allowed, effectively
#                              disabling multichannel processing.
#
options		SND_DEBUG
options		SND_DIAGNOSTIC
options		SND_FEEDER_MULTIFORMAT
options		SND_FEEDER_FULL_MULTIFORMAT
options		SND_FEEDER_RATE_HP
options		SND_PCM_64
options		SND_OLDSTEREO

#
# IEEE-488 hardware:
# pcii:		PCIIA cards (uPD7210 based isa cards)
# tnt4882:	National Instruments PCI-GPIB card.

device	pcii
hint.pcii.0.at="isa"
hint.pcii.0.port="0x2e1"
hint.pcii.0.irq="5"
hint.pcii.0.drq="1"

device	tnt4882

#
# Miscellaneous hardware:
#
# scd: Sony CD-ROM using proprietary (non-ATAPI) interface
# mcd: Mitsumi CD-ROM using proprietary (non-ATAPI) interface
# bktr: Brooktree bt848/848a/849a/878/879 video capture and TV Tuner board
# joy: joystick (including IO DATA PCJOY PC Card joystick)
# cmx: OmniKey CardMan 4040 pccard smartcard reader

# Mitsumi CD-ROM
device		mcd
hint.mcd.0.at="isa"
hint.mcd.0.port="0x300"
# for the Sony CDU31/33A CDROM
device		scd
hint.scd.0.at="isa"
hint.scd.0.port="0x230"
device		joy			# PnP aware, hints for non-PnP only
hint.joy.0.at="isa"
hint.joy.0.port="0x201"
device		cmx

#
# The 'bktr' device is a PCI video capture device using the Brooktree
# bt848/bt848a/bt849a/bt878/bt879 chipset. When used with a TV Tuner it forms a
# TV card, e.g. Miro PC/TV, Hauppauge WinCast/TV WinTV, VideoLogic Captivator,
# Intel Smart Video III, AverMedia, IMS Turbo, FlyVideo.
#
# options 	OVERRIDE_CARD=xxx
# options 	OVERRIDE_TUNER=xxx
# options 	OVERRIDE_MSP=1
# options 	OVERRIDE_DBX=1
# These options can be used to override the auto detection
# The current values for xxx are found in src/sys/dev/bktr/bktr_card.h
# Using sysctl(8) run-time overrides on a per-card basis can be made
#
# options 	BROOKTREE_SYSTEM_DEFAULT=BROOKTREE_PAL
# or
# options 	BROOKTREE_SYSTEM_DEFAULT=BROOKTREE_NTSC
# Specifies the default video capture mode.
# This is required for Dual Crystal (28&35Mhz) boards where PAL is used
# to prevent hangs during initialisation, e.g. VideoLogic Captivator PCI.
#
# options 	BKTR_USE_PLL
# This is required for PAL or SECAM boards with a 28Mhz crystal and no 35Mhz
# crystal, e.g. some new Bt878 cards.
#
# options 	BKTR_GPIO_ACCESS
# This enables IOCTLs which give user level access to the GPIO port.
#
# options 	BKTR_NO_MSP_RESET
# Prevents the MSP34xx reset. Good if you initialise the MSP in another OS first
#
# options 	BKTR_430_FX_MODE
# Switch Bt878/879 cards into Intel 430FX chipset compatibility mode.
#
# options 	BKTR_SIS_VIA_MODE
# Switch Bt878/879 cards into SIS/VIA chipset compatibility mode which is
# needed for some old SiS and VIA chipset motherboards.
# This also allows Bt878/879 chips to work on old OPTi (<1997) chipset
# motherboards and motherboards with bad or incomplete PCI 2.1 support.
# As a rough guess, old = before 1998
#
# options 	BKTR_NEW_MSP34XX_DRIVER
# Use new, more complete initialization scheme for the msp34* soundchip.
# Should fix stereo autodetection if the old driver does only output
# mono sound.

#
# options 	BKTR_USE_FREEBSD_SMBUS
# Compile with FreeBSD SMBus implementation
#
# Brooktree driver has been ported to the new I2C framework. Thus,
# you'll need to have the following 3 lines in the kernel config.
#     device smbus
#     device iicbus
#     device iicbb
#     device iicsmb
# The iic and smb devices are only needed if you want to control other
# I2C slaves connected to the external connector of some cards.
#
device		bktr
 
#
# PC Card/PCMCIA and Cardbus
#
# cbb: pci/cardbus bridge implementing YENTA interface
# pccard: pccard slots
# cardbus: cardbus slots
device		cbb
device		pccard
device		cardbus

#
# MMC/SD
#
# mmc 		MMC/SD bus
# mmcsd		MMC/SD memory card
# sdhci		Generic PCI SD Host Controller
#
device		mmc
device		mmcsd
device		sdhci

#
# SMB bus
#
# System Management Bus support is provided by the 'smbus' device.
# Access to the SMBus device is via the 'smb' device (/dev/smb*),
# which is a child of the 'smbus' device.
#
# Supported devices:
# smb		standard I/O through /dev/smb*
#
# Supported SMB interfaces:
# iicsmb	I2C to SMB bridge with any iicbus interface
# bktr		brooktree848 I2C hardware interface
# intpm		Intel PIIX4 (82371AB, 82443MX) Power Management Unit
# alpm		Acer Aladdin-IV/V/Pro2 Power Management Unit
# ichsmb	Intel ICH SMBus controller chips (82801AA, 82801AB, 82801BA)
# viapm		VIA VT82C586B/596B/686A and VT8233 Power Management Unit
# amdpm		AMD 756 Power Management Unit
# amdsmb	AMD 8111 SMBus 2.0 Controller
# nfpm		NVIDIA nForce Power Management Unit
# nfsmb		NVIDIA nForce2/3/4 MCP SMBus 2.0 Controller
#
device		smbus		# Bus support, required for smb below.

device		intpm
device		alpm
device		ichsmb
device		viapm
device		amdpm
device		amdsmb
device		nfpm
device		nfsmb

device		smb

#
# I2C Bus
#
# Philips i2c bus support is provided by the `iicbus' device.
#
# Supported devices:
# ic	i2c network interface
# iic	i2c standard io
# iicsmb i2c to smb bridge. Allow i2c i/o with smb commands.
#
# Supported interfaces:
# bktr	brooktree848 I2C software interface
#
# Other:
# iicbb	generic I2C bit-banging code (needed by lpbb, bktr)
#
device		iicbus		# Bus support, required for ic/iic/iicsmb below.
device		iicbb

device		ic
device		iic
device		iicsmb		# smb over i2c bridge

# I2C peripheral devices
#
# ds133x	Dallas Semiconductor DS1337, DS1338 and DS1339 RTC
# ds1672	Dallas Semiconductor DS1672 RTC
#
device		ds133x
device		ds1672

# Parallel-Port Bus
#
# Parallel port bus support is provided by the `ppbus' device.
# Multiple devices may be attached to the parallel port, devices
# are automatically probed and attached when found.
#
# Supported devices:
# vpo	Iomega Zip Drive
#	Requires SCSI disk support ('scbus' and 'da'), best
#	performance is achieved with ports in EPP 1.9 mode.
# lpt	Parallel Printer
# plip	Parallel network interface
# ppi	General-purpose I/O ("Geek Port") + IEEE1284 I/O
# pps	Pulse per second Timing Interface
# lpbb	Philips official parallel port I2C bit-banging interface
# pcfclock Parallel port clock driver.
#
# Supported interfaces:
# ppc	ISA-bus parallel port interfaces.
#

options 	PPC_PROBE_CHIPSET # Enable chipset specific detection
				  # (see flags in ppc(4))
options 	DEBUG_1284	# IEEE1284 signaling protocol debug
options 	PERIPH_1284	# Makes your computer act as an IEEE1284
				# compliant peripheral
options 	DONTPROBE_1284	# Avoid boot detection of PnP parallel devices
options 	VP0_DEBUG	# ZIP/ZIP+ debug
options 	LPT_DEBUG	# Printer driver debug
options 	PPC_DEBUG	# Parallel chipset level debug
options 	PLIP_DEBUG	# Parallel network IP interface debug
options 	PCFCLOCK_VERBOSE         # Verbose pcfclock driver
options 	PCFCLOCK_MAX_RETRIES=5   # Maximum read tries (default 10)

device		ppc
hint.ppc.0.at="isa"
hint.ppc.0.irq="7"
device		ppbus
device		vpo
device		lpt
device		plip
device		ppi
device		pps
device		lpbb
device		pcfclock

# Kernel BOOTP support

options 	BOOTP		# Use BOOTP to obtain IP address/hostname
				# Requires NFSCLIENT and NFS_ROOT
options 	BOOTP_NFSROOT	# NFS mount root filesystem using BOOTP info
options 	BOOTP_NFSV3	# Use NFS v3 to NFS mount root
options 	BOOTP_COMPAT	# Workaround for broken bootp daemons.
options 	BOOTP_WIRED_TO=fxp0 # Use interface fxp0 for BOOTP
options 	BOOTP_BLOCKSIZE=8192 # Override NFS block size

#
# Add software watchdog routines.
#
options 	SW_WATCHDOG

#
# Add the software deadlock resolver thread.
#
options 	DEADLKRES

#
# Disable swapping of stack pages.  This option removes all
# code which actually performs swapping, so it's not possible to turn
# it back on at run-time.
#
# This is sometimes usable for systems which don't have any swap space
# (see also sysctls "vm.defer_swapspace_pageouts" and
# "vm.disable_swapspace_pageouts")
#
#options 	NO_SWAPPING

# Set the number of sf_bufs to allocate. sf_bufs are virtual buffers
# for sendfile(2) that are used to map file VM pages, and normally
# default to a quantity that is roughly 16*MAXUSERS+512. You would
# typically want about 4 of these for each simultaneous file send.
#
options 	NSFBUFS=1024

#
# Enable extra debugging code for locks.  This stores the filename and
# line of whatever acquired the lock in the lock itself, and changes a
# number of function calls to pass around the relevant data.  This is
# not at all useful unless you are debugging lock code.  Also note
# that it is likely to break e.g. fstat(1) unless you recompile your
# userland with -DDEBUG_LOCKS as well.
#
options 	DEBUG_LOCKS


#####################################################################
# USB support
# UHCI controller
device		uhci
# OHCI controller
device		ohci
# EHCI controller
device		ehci
# XHCI controller
device		xhci
# SL811 Controller
#device		slhci
# General USB code (mandatory for USB)
device		usb
#
# USB Double Bulk Pipe devices
device		udbp
# USB Fm Radio
device		ufm
# Human Interface Device (anything with buttons and dials)
device		uhid
# USB keyboard
device		ukbd
# USB printer
device		ulpt
# USB mass storage driver (Requires scbus and da)
device		umass
# USB mass storage driver for device-side mode
device		usfs
# USB support for Belkin F5U109 and Magic Control Technology serial adapters
device		umct
# USB modem support
device		umodem
# USB mouse
device		ums
# eGalax USB touch screen
device		uep
# Diamond Rio 500 MP3 player
device		urio
#
# USB serial support
device		ucom
# USB support for 3G modem cards by Option, Novatel, Huawei and Sierra
device		u3g
# USB support for Technologies ARK3116 based serial adapters
device		uark
# USB support for Belkin F5U103 and compatible serial adapters
device		ubsa
# USB support for serial adapters based on the FT8U100AX and FT8U232AM
device		uftdi
# USB support for some Windows CE based serial communication.
device		uipaq
# USB support for Prolific PL-2303 serial adapters
device		uplcom
# USB support for Silicon Laboratories CP2101/CP2102 based USB serial adapters
device		uslcom
# USB Visor and Palm devices
device		uvisor
# USB serial support for DDI pocket's PHS
device		uvscom
#
# ADMtek USB ethernet. Supports the LinkSys USB100TX,
# the Billionton USB100, the Melco LU-ATX, the D-Link DSB-650TX
# and the SMC 2202USB. Also works with the ADMtek AN986 Pegasus
# eval board.
device		aue

# ASIX Electronics AX88172 USB 2.0 ethernet driver. Used in the
# LinkSys USB200M and various other adapters.
device		axe

#
# Devices which communicate using Ethernet over USB, particularly
# Communication Device Class (CDC) Ethernet specification. Supports
# Sharp Zaurus PDAs, some DOCSIS cable modems and so on.
device		cdce
#
# CATC USB-EL1201A USB ethernet. Supports the CATC Netmate
# and Netmate II, and the Belkin F5U111.
device		cue
#
# Kawasaki LSI ethernet. Supports the LinkSys USB10T,
# Entrega USB-NET-E45, Peracom Ethernet Adapter, the
# 3Com 3c19250, the ADS Technologies USB-10BT, the ATen UC10T,
# the Netgear EA101, the D-Link DSB-650, the SMC 2102USB
# and 2104USB, and the Corega USB-T.
device		kue
#
# RealTek RTL8150 USB to fast ethernet. Supports the Melco LUA-KTX
# and the GREEN HOUSE GH-USB100B.
device		rue
#
# Davicom DM9601E USB to fast ethernet. Supports the Corega FEther USB-TXC.
device		udav
#
# HSxPA devices from Option N.V
device		uhso

#
# Ralink Technology RT2501USB/RT2601USB wireless driver
device		rum
# Ralink Technology RT2700U/RT2800U/RT3000U wireless driver
device		run
#
# Atheros AR5523 wireless driver
device		uath
#
# Ralink Technology RT2500USB wireless driver
device		ural
#
# ZyDas ZD1211/ZD1211B wireless driver
device		zyd

# 
# debugging options for the USB subsystem
#
options 	USB_DEBUG
options 	U3G_DEBUG

# options for ukbd:
options 	UKBD_DFLT_KEYMAP	# specify the built-in keymap
makeoptions	UKBD_DFLT_KEYMAP=it.iso

# options for uplcom:
options 	UPLCOM_INTR_INTERVAL=100	# interrupt pipe interval
						# in milliseconds

# options for uvscom:
options 	UVSCOM_DEFAULT_OPKTSIZE=8	# default output packet size
options 	UVSCOM_INTR_INTERVAL=100	# interrupt pipe interval
						# in milliseconds

#####################################################################
# FireWire support

device		firewire	# FireWire bus code
device		sbp		# SCSI over Firewire (Requires scbus and da)
device		sbp_targ	# SBP-2 Target mode  (Requires scbus and targ)
device		fwe		# Ethernet over FireWire (non-standard!)
device		fwip		# IP over FireWire (RFC2734 and RFC3146)

#####################################################################
# dcons support (Dumb Console Device)

device		dcons			# dumb console driver
device		dcons_crom		# FireWire attachment
options 	DCONS_BUF_SIZE=16384	# buffer size
options 	DCONS_POLL_HZ=100	# polling rate
options 	DCONS_FORCE_CONSOLE=0	# force to be the primary console
options 	DCONS_FORCE_GDB=1	# force to be the gdb device

#####################################################################
# crypto subsystem
#
# This is a port of the OpenBSD crypto framework.  Include this when
# configuring IPSEC and when you have a h/w crypto device to accelerate
# user applications that link to OpenSSL.
#
# Drivers are ports from OpenBSD with some simple enhancements that have
# been fed back to OpenBSD.

device		crypto		# core crypto support
device		cryptodev	# /dev/crypto for access to h/w

device		rndtest		# FIPS 140-2 entropy tester

device		hifn		# Hifn 7951, 7781, etc.
options 	HIFN_DEBUG	# enable debugging support: hw.hifn.debug
options 	HIFN_RNDTEST	# enable rndtest support

device		ubsec		# Broadcom 5501, 5601, 58xx
options 	UBSEC_DEBUG	# enable debugging support: hw.ubsec.debug
options 	UBSEC_RNDTEST	# enable rndtest support

#####################################################################


#
# Embedded system options:
#
# An embedded system might want to run something other than init.
options 	INIT_PATH=/sbin/init:/stand/sysinstall

# Debug options
options 	BUS_DEBUG	# enable newbus debugging
options 	DEBUG_VFS_LOCKS	# enable VFS lock debugging
options 	SOCKBUF_DEBUG	# enable sockbuf last record/mb tail checking

#
# Verbose SYSINIT
#
# Make the SYSINIT process performed by mi_startup() verbose.  This is very
# useful when porting to a new architecture.  If DDB is also enabled, this
# will print function names instead of addresses.
options 	VERBOSE_SYSINIT

#####################################################################
# SYSV IPC KERNEL PARAMETERS
#
# Maximum number of entries in a semaphore map.
options 	SEMMAP=31

# Maximum number of System V semaphores that can be used on the system at
# one time.
options 	SEMMNI=11

# Total number of semaphores system wide
options 	SEMMNS=61

# Total number of undo structures in system
options 	SEMMNU=31

# Maximum number of System V semaphores that can be used by a single process
# at one time.
options 	SEMMSL=61

# Maximum number of operations that can be outstanding on a single System V
# semaphore at one time.
options 	SEMOPM=101

# Maximum number of undo operations that can be outstanding on a single
# System V semaphore at one time.
options 	SEMUME=11

# Maximum number of shared memory pages system wide.
options 	SHMALL=1025

# Maximum size, in bytes, of a single System V shared memory region.
options 	SHMMAX=(SHMMAXPGS*PAGE_SIZE+1)
options 	SHMMAXPGS=1025

# Minimum size, in bytes, of a single System V shared memory region.
options 	SHMMIN=2

# Maximum number of shared memory regions that can be used on the system
# at one time.
options 	SHMMNI=33

# Maximum number of System V shared memory regions that can be attached to
# a single process at one time.
options 	SHMSEG=9

# Compress user core dumps.
options		COMPRESS_USER_CORES
# required to compress file output from kernel for COMPRESS_USER_CORES.
device		gzio	    

# Set the amount of time (in seconds) the system will wait before
# rebooting automatically when a kernel panic occurs.  If set to (-1),
# the system will wait indefinitely until a key is pressed on the
# console.
options 	PANIC_REBOOT_WAIT_TIME=16

# Attempt to bypass the buffer cache and put data directly into the
# userland buffer for read operation when O_DIRECT flag is set on the
# file.  Both offset and length of the read operation must be
# multiples of the physical media sector size.
#
options 	DIRECTIO

# Specify a lower limit for the number of swap I/O buffers.  They are
# (among other things) used when bypassing the buffer cache due to
# DIRECTIO kernel option enabled and O_DIRECT flag set on file.
#
options 	NSWBUF_MIN=120

#####################################################################

# More undocumented options for linting.
# Note that documenting these is not considered an affront.

options 	CAM_DEBUG_DELAY

# VFS cluster debugging.
options 	CLUSTERDEBUG

options 	DEBUG

# Kernel filelock debugging.
options 	LOCKF_DEBUG

# System V compatible message queues
# Please note that the values provided here are used to test kernel
# building.  The defaults in the sources provide almost the same numbers.
# MSGSSZ must be a power of 2 between 8 and 1024.
options 	MSGMNB=2049	# Max number of chars in queue
options 	MSGMNI=41	# Max number of message queue identifiers
options 	MSGSEG=2049	# Max number of message segments
options 	MSGSSZ=16	# Size of a message segment
options 	MSGTQL=41	# Max number of messages in system

options 	NBUF=512	# Number of buffer headers

options 	SCSI_NCR_DEBUG
options 	SCSI_NCR_MAX_SYNC=10000
options 	SCSI_NCR_MAX_WIDE=1
options 	SCSI_NCR_MYADDR=7

options 	SC_DEBUG_LEVEL=5	# Syscons debug level
options 	SC_RENDER_DEBUG	# syscons rendering debugging

options 	SHOW_BUSYBUFS	# List buffers that prevent root unmount
options 	VFS_BIO_DEBUG	# VFS buffer I/O debugging

options 	KSTACK_MAX_PAGES=32 # Maximum pages to give the kernel stack

# Adaptec Array Controller driver options
options 	AAC_DEBUG	# Debugging levels:
				# 0 - quiet, only emit warnings
				# 1 - noisy, emit major function
				#     points and things done
				# 2 - extremely noisy, emit trace
				#     items in loops, etc.

# Yet more undocumented options for linting.
# BKTR_ALLOC_PAGES has no effect except to cause warnings, and
# BROOKTREE_ALLOC_PAGES hasn't actually been superseded by it, since the
# driver still mostly spells this option BROOKTREE_ALLOC_PAGES.
##options 	BKTR_ALLOC_PAGES=(217*4+1)
options 	BROOKTREE_ALLOC_PAGES=(217*4+1)
options 	MAXFILES=999