- I broke binary compat. update KTR_VERSION.

[FreeBSD/FreeBSD.git] / sys / conf / NOTES

# $FreeBSD$
#
# 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

#
# 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 builtin 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 Linux API modules and plus those parts of the sound system I need.
#makeoptions    MODULES_OVERRIDE="linux 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

# Options for the VM subsystem
# L2 cache size (in KB) can be specified in PQ_CACHESIZE
options         PQ_CACHESIZE=512        # color for 512k cache
# Deprecated options supported for backwards compatibility
#options        PQ_NOOPT                # No coloring
#options        PQ_LARGECACHE           # color for 512k cache
#options        PQ_HUGECACHE            # color for 1024k cache
#options        PQ_MEDIUMCACHE          # color for 256k cache
#options        PQ_NORMALCACHE          # color for 64k cache

# This allows you to actually store this configuration file into
# the kernel binary itself, where it may be later read by saying:
#    strings -n 3 /boot/kernel/kernel | sed -n 's/^___//p' > MYKERNEL
#
options         INCLUDE_CONFIG_FILE     # Include this file in kernel

options         GEOM_AES                # Don't use, use GEOM_BDE
options         GEOM_APPLE              # Apple partitioning
options         GEOM_BDE                # Disk encryption.
options         GEOM_BSD                # BSD disklabels
options         GEOM_CONCAT             # Disk concatenation.
options         GEOM_FOX                # Redundant path mitigation
options         GEOM_GATE               # Userland services.
options         GEOM_GPT                # GPT partitioning
options         GEOM_LABEL              # Providers labelization.
options         GEOM_MBR                # DOS/MBR partitioning
options         GEOM_MIRROR             # Disk mirroring.
options         GEOM_NOP                # Test class.
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_VOL                # Volume names from UFS superblock

#
# 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\"

\f
#####################################################################
# 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 is a new scheduler that has been designed for SMP and has some
# advantages for UP as well.  It is intended to replace the 4BSD scheduler
# over time.
#
options         SCHED_4BSD
#options        SCHED_ULE
\f
#####################################################################
# 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_GIANT causes the Giant lock to also be made adaptive when
# running without NO_ADAPTIVE_MUTEXES.  Normally, because Giant is assumed
# to be held for extended periods, contention on Giant will cause a thread
# to sleep rather than spinning.
options         ADAPTIVE_GIANT

# 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, MUTEX_PROFILING,
# and WITNESS options.
options         MUTEX_NOINLINE

# MUTEX_WAKE_ALL changes the mutex unlock algorithm to wake all waiters
# when a contested mutex is released rather than just awaking the highest
# priority waiter.
options         MUTEX_WAKE_ALL

# SMP Debugging Options:
#
# PREEMPTION allows the threads that are in the kernel to be preempted
#         by higher priority threads.  It helps with interactivity and
#         allows interrupt threads to run sooner rather than waiting.
#         WARNING! Only tested on alpha, 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.
# IPI_PREEMPTION instructs the kernel to preempt threads running on other
#         CPUS if needed.  Relies on the PREEMPTION option
# 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.
# 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         IPI_PREEMPTION
options         MUTEX_DEBUG
options         WITNESS
options         WITNESS_KDB
options         WITNESS_SKIPSPIN

# MUTEX_PROFILING - Profiling mutual exclusion locks (mutexes).  See
# MUTEX_PROFILING(9) for details.
options         MUTEX_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

\f
#####################################################################
# 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

# Enable FreeBSD4 compatibility syscalls
options         COMPAT_FREEBSD4

#
# 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

\f
#####################################################################
# 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 consol output that can
# interfere with serial console operation.
#
options         SYSCTL_DEBUG

#
# 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

#
# 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 mechanism imported from BSD/OS.  Currently it
# has no userland interface aside from a few sysctl's.  It is enabled with
# the KTR option.  KTR_ENTRIES defines the number of entries in the circular
# trace buffer.  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.
#
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 facilty 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 via the Debugger() function 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 let 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

\f
#####################################################################
# PERFORMANCE MONITORING OPTIONS

#
# The hwpmc driver that allows the use of in-CPU performance monitoring
# counters for performance monitoring.  The base kernel needs to configured
# with the 'options' line, while the hwpmc device can be either compiled
# in or loaded as a loadable kernel module.
#
device          hwpmc                   # Driver (also a loadable module)
options         HWPMC_HOOKS             # Other necessary kernel hooks

\f
#####################################################################
# NETWORKING OPTIONS

#
# Protocol families:
#  Only the INET (Internet) family is officially supported in FreeBSD.
#
options         INET                    #Internet communications protocols
options         INET6                   #IPv6 communications protocols
options         IPSEC                   #IP security
options         IPSEC_ESP               #IP security (crypto; define w/ IPSEC)
options         IPSEC_DEBUG             #debug for IP security
#
# Set IPSEC_FILTERGIF to force packets coming through a gif tunnel
# to be processed by any configured packet filtering (ipfw, ipf).
# The default is that packets coming from 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_FILTERGIF         #filter ipsec packets from a tunnel

#options        FAST_IPSEC              #new IPsec (cannot define w/ IPSEC)

options         IPX                     #IPX/SPX communications protocols
options         IPXIP                   #IPX in IP encapsulation (not available)

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.
# NETSMBCRYPTO enables support for encrypted passwords.
options         NETSMB                  #SMB/CIFS requester
options         NETSMBCRYPTO            #encrypted password support for SMB

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

# libalias library, performing NAT
options         LIBALIAS

# 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. In order to build a SMP kernel you must
# also have the ALTQ_NOPCC option.
options         ALTQ
options         ALTQ_CBQ        # Class Bases 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 for SMP build
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_H4           # ng_h4(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_CISCO
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_PPP
options         NETGRAPH_PPPOE
options         NETGRAPH_PPTPGRE
options         NETGRAPH_RFC1490
options         NETGRAPH_SOCKET
options         NETGRAPH_SPLIT
options         NETGRAPH_SPPP
options         NETGRAPH_TCPMSS
options         NETGRAPH_TEE
options         NETGRAPH_TTY
options         NETGRAPH_UI
options         NETGRAPH_VJC

# 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.
#  The `ether' device provides generic code to handle
#  Ethernets; it is MANDATORY when an Ethernet device driver is
#  configured or token-ring is enabled.
#  The `vlan' device implements the VLAN tagging of Ethernet frames
#  according to IEEE 802.1Q.  It requires `device miibus'.
#  The `wlan' device provides generic code to support 802.11
#  drivers, including host AP mode; it is MANDATORY for the wi,
#  ath, and awi drivers and will eventually be required by all 802.11 drivers.
#  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.
#  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.
#  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 `fddi' device provides generic code to support FDDI.
#  The `arcnet' device provides generic code to support Arcnet.
#  The `sppp' device serves a similar role for certain types
#  of synchronous PPP links (like `cx', `ar').
#  The `sl' device implements the Serial Line IP (SLIP) service.
#  The `ppp' device implements the Point-to-Point Protocol.
#  The `bpf' device enables the Berkeley Packet Filter.  Be
#  aware of the legal and administrative consequences of enabling this
#  option.  The number of devices determines the maximum number of
#  simultaneous BPF clients programs runnable.  DHCP requires bpf.
#  The `disc' device implements a minimal network interface,
#  which throws away all packets sent and never receives any.  It is
#  included for testing purposes.  This shows up as the `ds' interface.
#  The `tap' device is a pty-like virtual Ethernet interface
#  The `tun' device implements (user-)ppp and nos-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.
#  The `faith' device captures packets sent to it and diverts them
#  to the IPv4/IPv6 translation daemon.
#  The `stf' device implements 6to4 encapsulation.
#  The `ef' device provides support for multiple ethernet frame types
#  specified via ETHER_* options. See ef(4) for details.
#
# 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).
#
# The PPP_BSDCOMP option enables support for compress(1) style entire
# packet compression, the PPP_DEFLATE is for zlib/gzip style compression.
# PPP_FILTER enables code for filtering the ppp data stream and selecting
# events for resetting the demand dial activity timer - requires bpf.
# See pppd(8) for more details.
#
device          ether                   #Generic Ethernet
device          vlan                    #VLAN support (needs miibus)
device          wlan                    #802.11 support
device          wlan_wep                #802.11 WEP support
device          wlan_ccmp               #802.11 CCMP support
device          wlan_tkip               #802.11 TKIP support
device          wlan_xauth              #802.11 external authenticator support
device          wlan_acl                #802.11 MAC ACL support
device          token                   #Generic TokenRing
device          fddi                    #Generic FDDI
device          arcnet                  #Generic Arcnet
device          sppp                    #Generic Synchronous PPP
device          loop                    #Network loopback device
device          bpf                     #Berkeley packet filter
device          disc                    #Discard device (ds0, ds1, etc)
device          tap                     #Virtual Ethernet driver
device          tun                     #Tunnel driver (ppp(8), nos-tun(8))
device          sl                      #Serial Line IP
device          gre                     #IP over IP tunneling
device          if_bridge               #Bridge interface
device          pf                      #PF OpenBSD packet-filter firewall
device          pflog                   #logging support interface for PF
device          pfsync                  #synchronization interface for PF
device          carp                    #Common Address Redundancy Protocol
device          ppp                     #Point-to-point protocol
options         PPP_BSDCOMP             #PPP BSD-compress support
options         PPP_DEFLATE             #PPP zlib/deflate/gzip support
options         PPP_FILTER              #enable bpf filtering (needs bpf)

device          ef                      # Multiple ethernet frames support
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

# for IPv6
device          gif                     #IPv6 and IPv4 tunneling
options         XBONEHACK
device          faith                   #for IPv6 and IPv4 translation
device          stf                     #6to4 IPv6 over IPv4 encapsulation

#
# Internet family options:
#
# MROUTING enables the kernel multicast packet forwarder, which works
# with mrouted(8).
#
# PIM enables Protocol Independent Multicast in the kernel.
# Requires MROUTING enabled.
#
# 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''.
#
# IPFIREWALL_FORWARD_EXTENDED enables full packet destination changing
# including redirecting packets to local IP addresses and ports.  All
# redirections apply to locally generated packets too.  Because of this
# great care is required when crafting the ruleset.
#
# 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         PIM                     # Protocol Independent Multicast
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_FORWARD_EXTENDED     #all packet dest changes
options         IPV6FIREWALL            #firewall for IPv6
options         IPV6FIREWALL_VERBOSE
options         IPV6FIREWALL_VERBOSE_LIMIT=100
options         IPV6FIREWALL_DEFAULT_TO_ACCEPT
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.
options         MBUF_STRESS_TEST

# Statically Link in accept filters
options         ACCEPT_FILTER_DATA
options         ACCEPT_FILTER_HTTP

# TCP_DROP_SYNFIN adds support for ignoring TCP packets with SYN+FIN. This
# prevents nmap et al. from identifying the TCP/IP stack, but breaks support
# for RFC1644 extensions and is not recommended for web servers.
#
options         TCP_DROP_SYNFIN         #drop TCP packets with SYN+FIN

# 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 FAST_IPSEC' or 'options
# IPSEC', and '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 "options HZ=1000" to achieve a
# smoother scheduling of the traffic.
#
# BRIDGE enables bridging between ethernet cards -- see bridge(4).
# You can use IPFIREWALL and DUMMYNET together with bridging.
#
options         DUMMYNET
options         BRIDGE

# 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

#
# ATM (HARP version) options
#
# ATM_CORE includes the base ATM functionality code.  This must be included
#       for ATM support.
#
# ATM_IP includes support for running IP over ATM.
#
# At least one (and usually only one) of the following signalling managers
# must be included (note that all signalling managers include PVC support):
# ATM_SIGPVC includes support for the PVC-only signalling manager `sigpvc'.
# ATM_SPANS includes support for the `spans' signalling manager, which runs
#       the FORE Systems's proprietary SPANS signalling protocol.
# ATM_UNI includes support for the `uni30' and `uni31' signalling managers,
#       which run the ATM Forum UNI 3.x signalling protocols.
#
# The `hfa' driver provides support for the FORE Systems, Inc.
# PCA-200E ATM PCI Adapter.
#
# The `harp' pseudo-driver makes all NATM interface drivers available to HARP.
#
options         ATM_CORE                #core ATM protocol family
options         ATM_IP                  #IP over ATM support
options         ATM_SIGPVC              #SIGPVC signalling manager
options         ATM_SPANS               #SPANS signalling manager
options         ATM_UNI                 #UNI signalling manager

device          hfa                     #FORE PCA-200E ATM PCI
device          harp                    #Pseudo-interface for NATM

\f
#####################################################################
# 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 NULL, PORTAL, UMAP and UNION filesystems are known to be
# buggy, and WILL panic your system if you attempt to do anything with
# them.  They are included here as an incentive for some enterprising
# soul to sit down and fix them.
#

# 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         NTFS                    #NT File System
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
# Broken (seriously (functionally) broken):
#options        UMAPFS                  #UID map filesystem
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

# 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

# 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

# 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

# Experimental support for large MS-DOS filesystems.
#
# WARNING: This uses at least 32 bytes of kernel memory (which is not
# reclaimed until the FS is unmounted) for each file on disk to map
# between the 32-bit inode numbers used by VFS and the 64-bit pseudo-inode
# numbers used internally by msdosfs. This is only safe to use in certain
# controlled situations (e.g. read-only FS with less than 1 million files).
# Since the mappings do not persist across unmounts (or reboots), these
# filesystems are not suitable for exporting through NFS, or any other
# application that requires fixed inode numbers.
options         MSDOSFS_LARGE

\f
#####################################################################
# 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

\f
#####################################################################
# SECURITY POLICY PARAMETERS

# Support for Mandatory Access Control (MAC):
options         MAC
options         MAC_BIBA
options         MAC_BSDEXTENDED
options         MAC_DEBUG
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

\f
#####################################################################
# CLOCK OPTIONS

# The granularity of operation is controlled by the kernel option HZ whose
# default value (100) means a granularity of 10ms (1s/HZ).
# Some subsystems, such as DUMMYNET, might benefit from a smaller
# granularity such as 1ms or less, for a smoother scheduling of packets.
# Consider, however, 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

\f
#####################################################################
# 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.
#
#
# 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

# 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
# CAM_NEW_TRAN_CODE: this is the new transport layer code that will be switched
#                       to soon
# 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
# build a topology with the SES device that's on the box these drives
# are in....
options         SES_ENABLE_PASSTHROUGH

\f
#####################################################################
# MISCELLANEOUS DEVICES AND OPTIONS

# The `pty' device usually turns out to be ``effectively mandatory'',
# as it is required for `telnetd', `rlogind', `screen', `emacs', and
# `xterm', among others.

device          pty             #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

# Kernel side iconv library
options         LIBICONV

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

# Maximum size of a tty or pty input buffer.
options         TTYHOG=8193

\f
#####################################################################
# HARDWARE DEVICE CONFIGURATION

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

#
# Mandatory devices:
#

# The keyboard controller; it controls the keyboard and the PS/2 mouse.
device          atkbdc
hint.atkbdc.0.at="isa"
hint.atkbdc.0.port="0x060"

# The AT keyboard
device          atkbd
hint.atkbd.0.at="atkbdc"
hint.atkbd.0.irq="1"

# Options for atkbd:
options         ATKBD_DFLT_KEYMAP       # specify the built-in keymap
makeoptions     ATKBD_DFLT_KEYMAP=jp.106

# 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

# `flags' for atkbd:
#       0x01    Force detection of keyboard, else we always assume a keyboard
#       0x02    Don't reset keyboard, useful for some newer ThinkPads
#       0x03    Force detection and avoid reset, might help with certain
#               dockingstations
#       0x04    Old-style (XT) keyboard support, useful for older ThinkPads

# PS/2 mouse
device          psm
hint.psm.0.at="atkbdc"
hint.psm.0.irq="12"

# Options for psm:
options         PSM_HOOKRESUME          #hook the system resume event, useful
                                        #for some laptops
options         PSM_RESETAFTERSUSPEND   #reset the device at the resume event

# Video card driver for VGA adapters.
device          vga
hint.vga.0.at="isa"

# Options for vga:
# Try the following option if the mouse pointer is not drawn correctly
# or font does not seem to be loaded properly.  May cause flicker on
# some systems.
options         VGA_ALT_SEQACCESS

# If you can dispense with some vga driver features, you may want to
# use the following options to save some memory.
#options        VGA_NO_FONT_LOADING     # don't save/load font
#options        VGA_NO_MODE_CHANGE      # don't change video modes

# Older video cards may require this option for proper operation.
options         VGA_SLOW_IOACCESS       # do byte-wide i/o's to TS and GDC regs

# The following option probably won't work with the LCD displays.
options         VGA_WIDTH90             # support 90 column modes

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_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

#
# 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.
# 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          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/isp/ (Qlogic SCSI/FC driver).
#
#       ISP_TARGET_MODE         -       enable target mode operation
#
options         ISP_TARGET_MODE=1

# 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 'asr' driver provides support for current DPT/Adaptec SCSI RAID
# controllers (SmartRAID V and VI and later).
# These controllers require the CAM infrastructure.
#
device          asr

# 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 ant 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

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

#
# 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.
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)
#
# 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.

options         ATA_STATIC_ID

#
# 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"

#
# sio: serial ports (see sio(4)), including support for various
#      PC Card devices, such as Modem and NICs (see etc/defaults/pccard.conf)
#
device          sio
hint.sio.0.at="isa"
hint.sio.0.port="0x3F8"
hint.sio.0.flags="0x10"
hint.sio.0.irq="4"

# Options for sio:
options         COM_ESP                 # Code for Hayes ESP.
options         COM_MULTIPORT           # Code for some cards with shared IRQs.
options         CONSPEED=115200         # Speed for serial console
                                        # (default 9600).

# `flags' specific to sio(4).  See below for flags used by both sio(4) and
# uart(4).
#       0x20    force this unit to be the console (unless there is another
#               higher priority console).  This replaces the COMCONSOLE option.
#       0x40    reserve this unit for low level console operations.  Do not
#               access the device in any normal way.
# PnP `flags'
#       0x1     disable probing of this device.  Used to prevent your modem
#               from being attached as a PnP modem.
# Other flags for sio that aren't documented in the man page.
#       0x20000 enable hardware RTS/CTS and larger FIFOs.  Only works for
#               ST16650A-compatible UARTs.

#
# 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.
options         ALT_BREAK_TO_DEBUGGER

# PCI Universal Communications driver
# Supports various single and multi port PCI serial cards. Maybe later
# also the parallel ports on combination serial/parallel cards. New cards
# can be added in src/sys/dev/puc/pucdata.c.
#
# If the PUC_FASTINTR option is used the driver will try to use fast
# interrupts. The card must then be the only user of that interrupt.
# Interrupts cannot be shared when using PUC_FASTINTR.
device          puc
options         PUC_FASTINTR

#
# Network interfaces:
#
# MII bus support is required for some PCI 10/100 ethernet NICs,
# namely those which use MII-compliant transceivers or implement
# transceiver control interfaces that operate like an MII. Adding
# "device miibus0" 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.
device          miibus

# an:   Aironet 4500/4800 802.11 wireless adapters. Supports the PCMCIA,
#       PCI and ISA varieties.
# awi:  Support for IEEE 802.11 PC Card devices using the AMD Am79C930 and
#       Harris (Intersil) Chipset with PCnetMobile firmware by AMD.
# 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.
# cm:   Arcnet SMC COM90c26 / SMC COM90c56
#       (and SMC COM90c66 in '56 compatibility mode) adapters.
# cnw:  Xircom CNW/Netware Airsurfer PC Card adapter
# cs:   IBM Etherjet and other Crystal Semi CS89x0-based 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.
# 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)
# hme:  Sun HME (Happy Meal Ethernet)
# 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.
# 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 LinkSys
#       EG1032 and EG1064, the Surecom EP-320G-TX and the Netgear GA622T.
# pcn:  Support for PCI fast ethernet adapters based on the AMD Am79c97x
#       chipsets, including the PCnet/FAST, PCnet/FAST+, PCnet/PRO and
#       PCnet/Home. These were previously handled by the lnc driver (and
#       still will be if you leave this driver out of the kernel).
# 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.
# sis:  Support for NICs based on the Silicon Integrated Systems SiS 900,
#       SiS 7016 and NS DP83815 PCI fast ethernet controller chips.
# sbsh: Support for Granch SBNI16 SHDSL modem PCI adapters
# 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.
# 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 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 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          cs
hint.cs.0.at="isa"
hint.cs.0.port="0x300"
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          awi
device          cnw
device          wi
device          xe

# PCI Ethernet NICs that use the common MII bus controller code.
device          dc              # DEC/Intel 21143 and various workalikes
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
hint.fxp.0.prefer_iomap="0"
device          hme             # Sun HME (Happy Meal Ethernet)
device          my              # Myson Fast Ethernet (MTD80X, MTD89X)
device          rl              # RealTek 8129/8139
device          pcn             # AMD Am79C97x PCI 10/100 NICs
device          sf              # Adaptec AIC-6915 (``Starfire'')
device          sbsh            # Granch SBNI16 SHDSL modem
device          sis             # Silicon Integrated Systems SiS 900/SiS 7016
device          ste             # Sundance ST201 (D-Link DFE-550TX)
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          txp             # 3Com 3cR990 (``Typhoon'')
device          vx              # 3Com 3c590, 3c595 (``Vortex'')

# PCI Gigabit & FDDI NICs.
device          bge
device          lge
device          nge
device          sk
device          ti
device          fpa

# 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

# 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 tells 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_als4000:          Avance Logic ALS4000 PCI.
# snd_ad1816:           Analog Devices AD1816 ISA PnP/non-PnP.
# snd_audiocs:          Crystal Semiconductor CS4231 SBus/EBus.
# 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_es137x:           Ensoniq AudioPCI ES137x PCI.
# snd_ess:              Ensoniq ESS ISA PnP/non-PnP.
# snd_fm801:            Forte Media FM801 PCI.
# snd_gusc:             Gravis UltraSound ISA PnP/non-PnP.
# snd_ich:              Intel ICH PCI and some more audio controllers
#                       embedded in a chipset.
# 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
#                       conjuction with snd_sbc.
# snd_sb8:              Creative SoundBlaster (pre-16), to be used in
#                       conjuction with snd_sbc.
# snd_sbc:              Creative SoundBlaster ISA PnP/non-PnP.
#                       Supports ESS and Avance ISA chips as well.
# snd_solo:             ESS Solo-1x PCI.
# snd_t4dwave:          Trident 4DWave 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_au88x0
#device         snd_audiocs
device          snd_cmi
device          snd_cs4281
device          snd_csa
device          snd_ds1
device          snd_emu10k1
device          snd_es137x
device          snd_ess
device          snd_fm801
device          snd_gusc
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_t4dwave
device          snd_via8233
device          snd_via82c686
device          snd_vibes
#device         snd_vortex1
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"

#
# IEEE-488 hardware:
#       pcii:   PCIIA cards (uPD7210 based isa cards)
device  pcii
hint.pcii.0.at="isa"
hint.pcii.0.port="0x2e1"
hint.pcii.0.irq="5"
hint.pcii.0.drq="1"

#
# 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
# cy: Cyclades serial driver
# joy: joystick (including IO DATA PCJOY PC Card joystick)
# rc: RISCom/8 multiport card
# rp: Comtrol Rocketport(ISA/PCI) - single card
# si: Specialix SI/XIO 4-32 port terminal multiplexor
# nmdm: nullmodem terminal driver (see nmdm(4))

# Notes on the Comtrol Rocketport driver:
#
# The exact values used for rp0 depend on how many boards you have
# in the system.  The manufacturer's sample configs are listed as:
#
#               device  rp      # core driver support
#
#   Comtrol Rocketport ISA single card
#               hint.rp.0.at="isa"
#               hint.rp.0.port="0x280"
#
#   If instead you have two ISA cards, one installed at 0x100 and the
#   second installed at 0x180, then you should add the following to
#   your kernel probe hints:
#               hint.rp.0.at="isa"
#               hint.rp.0.port="0x100"
#               hint.rp.1.at="isa"
#               hint.rp.1.port="0x180"
#
#   For 4 ISA cards, it might be something like this:
#               hint.rp.0.at="isa"
#               hint.rp.0.port="0x180"
#               hint.rp.1.at="isa"
#               hint.rp.1.port="0x100"
#               hint.rp.2.at="isa"
#               hint.rp.2.port="0x340"
#               hint.rp.3.at="isa"
#               hint.rp.3.port="0x240"
#
#   For PCI cards, you need no hints.

# 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 nonpnp only
hint.joy.0.at="isa"
hint.joy.0.port="0x201"
device          rc
hint.rc.0.at="isa"
hint.rc.0.port="0x220"
hint.rc.0.irq="12"
device          rp
hint.rp.0.at="isa"
hint.rp.0.port="0x280"
device          si
options         SI_DEBUG
hint.si.0.at="isa"
hint.si.0.maddr="0xd0000"
hint.si.0.irq="12"
device          nmdm

#
# 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 enable 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
# (OLDCARD)
#
# card: pccard slots
# pcic: isa/pccard bridge
#device         pcic
#hint.pcic.0.at="isa"
#hint.pcic.1.at="isa"
#device         card    1

#
# PC Card/PCMCIA and Cardbus
# (NEWCARD)
#
# Note that NEWCARD and OLDCARD are incompatible.  Do not use both at the same
# time.
#
# pccbb: pci/cardbus bridge implementing YENTA interface
# pccard: pccard slots
# cardbus: cardbus slots
device          cbb
device          pccard
device          cardbus

#
# 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 io 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
# nfpm          NVIDIA nForce Power Management Unit
#
device          smbus           # Bus support, required for smb below.

device          intpm
device          alpm
device          ichsmb
device          viapm
device          amdpm
device          nfpm

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

# 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
#
# 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

#
# Add software watchdog routines.
#
options         SW_WATCHDOG

#
# 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 change 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

\f
#####################################################################
# USB support
# UHCI controller
device          uhci
# OHCI controller
device          ohci
# EHCI controller
device          ehci
# General USB code (mandatory for USB)
device          usb
#
# USB Double Bulk Pipe devices
device          udbp
# USB Fm Radio
device          ufm
# Generic USB device driver
device          ugen
# Human Interface Device (anything with buttons and dials)
device          uhid
# USB keyboard
device          ukbd
# USB printer
device          ulpt
# USB Iomega Zip 100 Drive (Requires scbus and da)
device          umass
# USB support for Belkin F5U109 and Magic Control Technology serial adapters
device          umct
# USB modem support
device          umodem
# USB mouse
device          ums
# Diamond Rio 500 Mp3 player
device          urio
# USB scanners
device          uscanner
#
# USB serial support
device          ucom
# USB support for Belkin F5U103 and compatible serial adapters
device          ubsa
# USB support for BWCT console serial adapters
device          ubser
# USB support for serial adapters based on the FT8U100AX and FT8U232AM
device          uftdi
# USB support for Prolific PL-2303 serial adapters
device          uplcom
# 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


# debugging options for the USB subsystem
#
options         USB_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 FAST_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

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

# 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 are 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         NMBCLUSTERS=1024        # Number of mbuf clusters

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         SLIP_IFF_OPTS
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
options         NDEVFSINO=1025
options         NDEVFSOVERFLOW=32769

# Yet more undocumented options for linting.
options         VGA_DEBUG