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

#
# LINT -- config file for checking all the sources, tries to pull in
#	as much of the source tree as it can.
#
# $FreeBSD: head/sys/conf/NOTES 56540 2000-01-24 17:16:03Z peter $
#
# NB: You probably don't want to try running a kernel built from this
# file.  Instead, you should start from GENERIC, and add options from
# this file as required.
#

#
# This directive is mandatory; it defines the architecture to be
# configured for; in this case, the 386 family based IBM-PC and
# compatibles.
#
machine		i386

#
# 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 complicated formula defined in param.c.
#
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.
#
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"

#
# Certain applications can grow to be larger than the 128M limit
# that FreeBSD initially imposes.  Below are some options to
# allow that limit to grow to 256MB, and can be increased further
# with changing the parameters.  MAXDSIZ is the maximum that the
# limit can be set to, and the DFLDSIZ is the default value for
# the limit.  You might want to set the default lower than the
# max, and explicitly set the maximum with a shell command for processes
# that regularly exceed the limit like INND.
#
options 	MAXDSIZ="(256*1024*1024)"
options 	DFLDSIZ="(256*1024*1024)"

#
# BLKDEV_IOSIZE sets the default block size used in user block
# device I/O.  Note that this value will be overriden 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
#options 	PQ_NOOPT		# No coloring
options 	PQ_LARGECACHE		# color for 512k/16k cache
#options 	PQ_HUGECACHE		# color for 1024k/16k cache
#options 	PQ_MEDIUMCACHE		# color for 64k/16k cache
#options 	PQ_NORMALCACHE		# color for 256k/16k cache

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


#####################################################################
# SMP OPTIONS:
#
# SMP enables building of a Symmetric MultiProcessor Kernel.
# APIC_IO enables the use of the IO APIC for Symmetric I/O.
# NCPU sets the number of CPUs, defaults to 2.
# NBUS sets the number of busses, defaults to 4.
# NAPIC sets the number of IO APICs on the motherboard, defaults to 1.
# NINTR sets the total number of INTs provided by the motherboard.
#
# Notes:
#
#  An SMP kernel will ONLY run on an Intel MP spec. qualified motherboard.
#
#  Be sure to disable 'cpu I386_CPU' && 'cpu I486_CPU' for SMP kernels.
#
#  Check the 'Rogue SMP hardware' section to see if additional options
#   are required by your hardware.
#

# Mandatory:
options 	SMP			# Symmetric MultiProcessor Kernel
options 	APIC_IO			# Symmetric (APIC) I/O

# Optional, these are the defaults plus 1:
options 	NCPU=5			# number of CPUs
options 	NBUS=5			# number of busses
options 	NAPIC=2			# number of IO APICs
options 	NINTR=25		# number of INTs

#
# Rogue SMP hardware:
#

# Bridged PCI cards:
#
# The MP tables of most of the current generation MP motherboards
#  do NOT properly support bridged PCI cards.  To use one of these
#  cards you should refer to ???


#####################################################################
# CPU OPTIONS

#
# You must specify at least one CPU (the one you intend to run on);
# deleting the specification for CPUs you don't need to use may make
# parts of the system run faster.  This is especially true removing
# I386_CPU.
#
cpu		I386_CPU
cpu		I486_CPU
cpu		I586_CPU		# aka Pentium(tm)
cpu		I686_CPU		# aka Pentium Pro(tm)

#
# Options for CPU features.
#
# CPU_BLUELIGHTNING_FPU_OP_CACHE enables FPU operand cache on IBM
# BlueLightning CPU.  It works only with Cyrix FPU, and this option
# should not be used with Intel FPU.
#
# CPU_BLUELIGHTNING_3X enables triple-clock mode on IBM Blue Lightning
# CPU if CPU supports it. The default is double-clock mode on
# BlueLightning CPU box.
#
# CPU_BTB_EN enables branch target buffer on Cyrix 5x86 (NOTE 1).
#
# CPU_DIRECT_MAPPED_CACHE sets L1 cache of Cyrix 486DLC CPU in direct
# mapped mode.  Default is 2-way set associative mode.
#
# CPU_CYRIX_NO_LOCK enables weak locking for the entire address space
# of Cyrix 6x86 and 6x86MX CPUs by setting the NO_LOCK bit of CCR1.
# Otherwise, the NO_LOCK bit of CCR1 is cleared.  (NOTE 3)
#
# CPU_DISABLE_5X86_LSSER disables load store serialize (i.e. enables
# reorder).  This option should not be used if you use memory mapped
# I/O device(s).
#
# CPU_FASTER_5X86_FPU enables faster FPU exception handler.
#
# CPU_I486_ON_386 enables CPU cache on i486 based CPU upgrade products
# for i386 machines.
#
# CPU_IORT defines I/O clock delay time (NOTE 1).  Default values of
# I/O clock delay time on Cyrix 5x86 and 6x86 are 0 and 7,respectively
# (no clock delay).
#
# CPU_LOOP_EN prevents flushing the prefetch buffer if the destination
# of a jump is already present in the prefetch buffer on Cyrix 5x86(NOTE
# 1).
#
# CPU_RSTK_EN enables return stack on Cyrix 5x86 (NOTE 1).
#
# CPU_SUSP_HLT enables suspend on HALT.  If this option is set, CPU
# enters suspend mode following execution of HALT instruction.
#
# CPU_WT_ALLOC enables write allocation on Cyrix 6x86/6x86MX and AMD
# K5/K6/K6-2 cpus.
#
# CYRIX_CACHE_WORKS enables CPU cache on Cyrix 486 CPUs with cache
# flush at hold state.
#
# CYRIX_CACHE_REALLY_WORKS enables (1) CPU cache on Cyrix 486 CPUs
# without cache flush at hold state, and (2) write-back CPU cache on
# Cyrix 6x86 whose revision < 2.7 (NOTE 2).
#
# NO_F00F_HACK disables the hack that prevents Pentiums (and ONLY
# Pentiums) from locking up when a LOCK CMPXCHG8B instruction is
# executed.  This should be included for ALL kernels that won't run
# on a Pentium.
#
# NO_MEMORY_HOLE is an optimisation for systems with AMD K6 processors
# which indicates that the 15-16MB range is *definitely* not being
# occupied by an ISA memory hole.
#
# NOTE 1: The options, CPU_BTB_EN, CPU_LOOP_EN, CPU_IORT,
# CPU_LOOP_EN and CPU_RSTK_EN should not be used because of CPU bugs.
# These options may crash your system.
#
# NOTE 2: If CYRIX_CACHE_REALLY_WORKS is not set, CPU cache is enabled
# in write-through mode when revision < 2.7.  If revision of Cyrix
# 6x86 >= 2.7, CPU cache is always enabled in write-back mode.
#
# NOTE 3: This option may cause failures for software that requires
# locked cycles in order to operate correctly.
#
options 	CPU_BLUELIGHTNING_FPU_OP_CACHE
options 	CPU_BLUELIGHTNING_3X
options 	CPU_BTB_EN
options 	CPU_DIRECT_MAPPED_CACHE
options 	CPU_DISABLE_5X86_LSSER
options 	CPU_FASTER_5X86_FPU
options 	CPU_I486_ON_386
options 	CPU_IORT
options 	CPU_LOOP_EN
options 	CPU_RSTK_EN
options 	CPU_SUSP_HLT
options 	CPU_WT_ALLOC
options 	CYRIX_CACHE_WORKS
options 	CYRIX_CACHE_REALLY_WORKS
#options 	NO_F00F_HACK

#
# A math emulator is mandatory if you wish to run on hardware which
# does not have a floating-point processor.  Pick either the original,
# bogus (but freely-distributable) math emulator, or a much more
# fully-featured but GPL-licensed emulator taken from Linux.
#
options 	MATH_EMULATE		#Support for x87 emulation
# Don't enable both of these in a real config.
options 	GPL_MATH_EMULATE	#Support for x87 emulation via
					#new math emulator


#####################################################################
# 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.
#
options 	COMPAT_43

#
# Allow user-mode programs to manipulate their local descriptor tables.
# This option is required for the WINE Windows(tm) emulator, and is
# not used by anything else (that we know of).
#
options 	USER_LDT		#allow user-level control of i386 ldt

#
# 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

#
# This option includes a MD5 routine in the kernel, this is used for
# various authentication and privacy uses.
#
options 	MD5

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

#
# Enable the kernel debugger.
#
options 	DDB

#
# Don't drop into DDB for a panic. Intended for unattended operation
# where you may want to drop to DDB from the console, but still want
# the machine to recover from a panic
#
options 	DDB_UNATTENDED

#
# If using GDB remote mode to debug the kernel, there's a non-standard
# extension to the remote protocol that can be used to use the serial
# port as both the debugging port and the system console.  It's non-
# standard and you're on your own if you enable it.  See also the
# "remotechat" variables in the FreeBSD specific version of gdb.
#
options 	GDB_REMOTE_CHAT

#
# KTRACE enables the system-call tracing facility ktrace(2).
#
options 	KTRACE			#kernel tracing

#
# 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.
#
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

#
# PERFMON causes the driver for Pentium/Pentium Pro performance counters
# to be compiled.  See perfmon(4) for more information.
#
options 	PERFMON


#
# 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


# XXX - this doesn't belong here.
# Allow ordinary users to take the console - this is useful for X.
options 	UCONSOLE

# XXX - this doesn't belong here either
options 	USERCONFIG		#boot -c editor
options 	INTRO_USERCONFIG	#imply -c and show intro screen
options 	VISUAL_USERCONFIG	#visual boot -c editor

# XXX - neither does this
options 	ROOTDEVNAME=\"da0s2e\"

#####################################################################
# NETWORKING OPTIONS

#
# Protocol families:
#  Only the INET (Internet) family is officially supported in FreeBSD.
#  Source code for the NS (Xerox Network Service) is provided for amusement
#  value.
#
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_IPV6FWD		#IP security tunnel for IPv6
options 	IPSEC_DEBUG		#debug for IP security

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

options 	NCP			#NetWare Core protocol

options 	NETATALK		#Appletalk communications protocols

# These are currently broken but are shipped due to interest.
#options 	NS			#Xerox NS protocols

# These are currently broken and are no longer shipped due to lack
# of interest.
#options 	CCITT			#X.25 network layer
#options 	ISO
#options 	TPIP			#ISO TP class 4 over IP
#options 	TPCONS			#ISO TP class 0 over X.25
#options 	LLC			#X.25 link layer for Ethernets
#options 	HDLC			#X.25 link layer for serial lines
#options 	EON			#ISO CLNP over IP
#options 	NSIP			#XNS over IP

# 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_ASYNC
options 	NETGRAPH_BPF
options 	NETGRAPH_CISCO
options 	NETGRAPH_ECHO
options 	NETGRAPH_FRAME_RELAY
options 	NETGRAPH_HOLE
options 	NETGRAPH_IFACE
options 	NETGRAPH_KSOCKET
options 	NETGRAPH_LMI
options 	NETGRAPH_PPP
options 	NETGRAPH_PPPOE
options 	NETGRAPH_PPTPGRE
options 	NETGRAPH_RFC1490
options 	NETGRAPH_SOCKET
options 	NETGRAPH_TEE
options 	NETGRAPH_TTY
options 	NETGRAPH_UI
options 	NETGRAPH_VJC

device		mn	# Munich32x/Falc54 Nx64kbit/sec cards.

#
# Network interfaces:
#  The `loop' pseudo-device is MANDATORY when networking is enabled.
#  The `ether' pseudo-device provides generic code to handle
#  Ethernets; it is MANDATORY when a Ethernet device driver is
#  configured or token-ring is enabled.
#  The 'fddi' pseudo-device provides generic code to support FDDI.
#  The `sppp' pseudo-device serves a similar role for certain types
#  of synchronous PPP links (like `cx', `ar').
#  The `sl' pseudo-device implements the Serial Line IP (SLIP) service.
#  The `ppp' pseudo-device implements the Point-to-Point Protocol.
#  The `bpf' pseudo-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.
#  The `disc' pseudo-device implements a minimal network interface,
#  which throws away all packets sent and never receives any.  It is
#  included for testing purposes.
#  The `tun' pseudo-device implements (user-)ppp and nos-tun
#  The `gif' pseudo-device implements IPv6 over IP4 tunneling,
#  IPv4 over IPv6 tunneling, IPv4 over IPv4 tunneling and
#  IPv6 over IPv6 tunneling.
#  The `faith' pseudo-device captures packets sent to it and diverts them
#  to the IPv4/IPv6 translation daemon.
#  The `ef' pseudo-device provides support for multiple ethernet frame types
#  specified via ETHER_* options. See ef(4) for details.
#
# 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.
#
pseudo-device	ether			#Generic Ethernet
pseudo-device	token			#Generic TokenRing
pseudo-device	fddi			#Generic FDDI
pseudo-device	sppp			#Generic Synchronous PPP
pseudo-device	loop			#Network loopback device
pseudo-device	bpf			#Berkeley packet filter
pseudo-device	disc			#Discard device
pseudo-device	tun			#Tunnel driver (ppp(8), nos-tun(8))
pseudo-device	sl	2		#Serial Line IP
pseudo-device	ppp	2		#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)

pseudo-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
pseudo-device	gif	4		#IPv6 and IPv4 tunneling
pseudo-device	faith	1		#for IPv6 and IPv4 translation

#
# Internet family options:
#
# TCP_COMPAT_42 causes the TCP code to emulate certain bugs present in
# 4.2BSD.  This option should not be used unless you have a 4.2BSD
# machine and TCP connections fail.
#
# MROUTING enables the kernel multicast packet forwarder, which works
# with mrouted(8).
#
# 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''
#
# 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 is undocumented.
#
options 	TCP_COMPAT_42		#emulate 4.2BSD TCP bugs
options 	MROUTING		# Multicast routing
options 	IPFIREWALL		#firewall
options 	IPFIREWALL_VERBOSE	#print information about
					# dropped packets
options 	IPFIREWALL_FORWARD	#enable transparent proxy support
options 	IPFIREWALL_VERBOSE_LIMIT=100	#limit verbosity
options 	IPFIREWALL_DEFAULT_TO_ACCEPT	#allow everything by default
options 	IPDIVERT		#divert sockets
options 	IPFILTER		#ipfilter support
options 	IPFILTER_LOG		#ipfilter logging
options 	IPSTEALTH		#support for stealth forwarding
options 	TCPDEBUG

# The following options add sysctl variables for controlling how certain
# TCP packets are handled.
#
# 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.
#
# TCP_RESTRICT_RST adds support for blocking the emission of TCP RST packets.
# This is useful on systems which are exposed to SYN floods (e.g. IRC servers)
# or any system which one does not want to be easily portscannable.
#
options 	TCP_DROP_SYNFIN		#drop TCP packets with SYN+FIN
options 	TCP_RESTRICT_RST	#restrict emission of TCP RST

# ICMP_BANDLIM enables icmp error response bandwidth limiting.   You
# typically want this option as it will help protect the machine from
# D.O.S. packet attacks.
#
options 	ICMP_BANDLIM

# DUMMYNET enables the "dummynet" bandwidth limiter. You need
# IPFIREWALL as well. See the dummynet(4) manpage for more info.
# BRIDGE enables bridging between ethernet cards -- see bridge(4).
# You can use IPFIREWALL and dummynet together with bridging.
options 	DUMMYNET
options 	BRIDGE

#
# 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 `hea' driver provides support for the Efficient Networks, Inc.
# ENI-155p ATM PCI Adapter.
#
# The `hfa' driver provides support for the FORE Systems, Inc.
# PCA-200E ATM PCI Adapter.
#
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		hea			#Efficient ENI-155p ATM PCI
device		hfa			#FORE PCA-200E ATM PCI


#####################################################################
# 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, and MFS --- 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 	MFS			#Memory File System
options 	NFS			#Network File System

# The rest are optional:
#options 	NFS_NOSERVER		#Disable the NFS-server code.
options 	CD9660			#ISO 9660 filesystem
options 	FDESC			#File descriptor filesystem
options 	KERNFS			#Kernel filesystem
options 	MSDOSFS			#MS DOS File System
options 	NTFS			#NT File System
options 	NULLFS			#NULL filesystem
options 	NWFS			#NetWare filesystem
options 	PORTAL			#Portal filesystem
options 	PROCFS			#Process filesystem
options 	UMAPFS			#UID map filesystem
options 	UNION			#Union filesystem
# The xFS_ROOT options REQUIRE the associated ``options xFS''
options 	CD9660_ROOT		#CD-ROM usable as root device
options 	FFS_ROOT		#FFS usable as root device
options 	NFS_ROOT		#NFS usable as root device
# This code is still experimental (e.g. doesn't handle disk slices well).
# Also, 'options MFS' is currently incompatible with DEVFS.
options 	DEVFS			#devices filesystem

# Soft updates is technique for improving file system speed and
# making abrupt shutdown less risky.  It is not enabled by default due
# to copyright restraints on the code that implement it.
#
# Read ../../ufs/ffs/README.softupdates to learn what you need to
# do to enable this.  ../../contrib/softupdates/README gives
# more details on how they actually work.
#
#options 	SOFTUPDATES

# 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

# Allow this many swap-devices.
options 	NSWAPDEV=20

# 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_UIDHASHSIZ=29	# Tune the size of nfssvc_sock with this
options 	NFS_WDELAYHASHSIZ=16	# and with this
options 	NFS_MUIDHASHSIZ=63	# Tune the size of nfsmount with this
options 	NFS_DEBUG		# Enable NFS Debugging

# Coda stuff:
options 	CODA			#CODA filesystem.
pseudo-device	vcoda	4		#coda minicache <-> venus comm.

#
# 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


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

# Real time extensions added in the 1993 Posix
# P1003_1B: Infrastructure
# _KPOSIX_PRIORITY_SCHEDULING: Build in _POSIX_PRIORITY_SCHEDULING
# _KPOSIX_VERSION:             Version kernel is built for

options 	P1003_1B
options 	_KPOSIX_PRIORITY_SCHEDULING
options 	_KPOSIX_VERSION=199309L


#####################################################################
# 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.
#
# Beginning with FreeBSD 2.0.5 you can 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.

# 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:

# device	scbus0 at ahc0		# Single bus device
# device	scbus1 at ahc1 bus 0	# Single bus device
# device	scbus3 at ahc2 bus 0	# Twin bus device
# device	scbus2 at ahc2 bus 1	# Twin bus device
# device 	da0 at scbus0 target 0 unit 0
# device	da1 at scbus3 target 1
# device	da2 at scbus2 target 3
# device	sa1 at scbus1 target 6
# device	cd

# "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 "unknown" device (uk? in pre-2.0.5) is now part of the base SCSI
# configuration and doesn't have to be explicitly configured.

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		pass			#CAM passthrough driver
device		pt			#SCSI processor type
device		ses			#SCSI SES/SAF-TE 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
# 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.
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=8000	# 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_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_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


#####################################################################
# 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.

pseudo-device	pty		#Pseudo ttys
pseudo-device	speaker		#Play IBM BASIC-style noises out your speaker
pseudo-device	gzip		#Exec gzipped a.out's
pseudo-device	vn		#Vnode driver (turns a file into a device)
pseudo-device	md		#Memory/malloc disk
pseudo-device	snp	3	#Snoop device - to look at pty/vty/etc..
pseudo-device	ccd	4	#Concatenated disk driver

# Configuring Vinum into the kernel is not necessary, since the kld
# module gets started automatically when vinum(8) starts.  This
# device is also untested.  Use at your own risk.
#
# The option VINUMDEBUG must match the value set in CFLAGS
# in src/sbin/vinum/Makefile.  Failure to do so will result in
# the following message from vinum(8):
#
# Can't get vinum config: Invalid argument
#
# see vinum(4) for more reasons not to use these options.
pseudo-device	vinum		#Vinum concat/mirror/raid driver
options 	VINUMDEBUG	#enable Vinum debugging hooks

# These are only for watching for bitrot in old tty code.
# broken
#pseudo-device	tb

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

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

# ISA and EISA devices:
# EISA support is available for some device, so they can be auto-probed.
# Micro Channel is not supported at all.

#
# Mandatory ISA devices: isa, npx
#
device		isa

#
# Options for `isa':
#
# AUTO_EOI_1 enables the `automatic EOI' feature for the master 8259A
# interrupt controller.  This saves about 0.7-1.25 usec for each interrupt.
# This option breaks suspend/resume on some portables.
#
# AUTO_EOI_2 enables the `automatic EOI' feature for the slave 8259A
# interrupt controller.  This saves about 0.7-1.25 usec for each interrupt.
# Automatic EOI is documented not to work for for the slave with the
# original i8259A, but it works for some clones and some integrated
# versions.
#
# MAXMEM specifies the amount of RAM on the machine; if this is not
# specified, FreeBSD will first read the amount of memory from the CMOS
# RAM, so the amount of memory will initially be limited to 64MB or 16MB
# depending on the BIOS.  If the BIOS reports 64MB, a memory probe will
# then attempt to detect the installed amount of RAM.  If this probe
# fails to detect >64MB RAM you will have to use the MAXMEM option.
# The amount is in kilobytes, so for a machine with 128MB of RAM, it would
# be 131072 (128 * 1024).
#
# BROKEN_KEYBOARD_RESET disables the use of the keyboard controller to
# reset the CPU for reboot.  This is needed on some systems with broken
# keyboard controllers.
#
# PAS_JOYSTICK_ENABLE enables the gameport on the ProAudio Spectrum

options 	AUTO_EOI_1
#options 	AUTO_EOI_2
options 	MAXMEM="(128*1024)"
#options 	BROKEN_KEYBOARD_RESET
#options 	PAS_JOYSTICK_ENABLE

# 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

# If you see the "calcru: negative time of %ld usec for pid %d (%s)\n"
# message you probably have some broken sw/hw which disables interrupts
# for too long.  You can make the system more resistant to this by
# choosing a high value for NTIMECOUNTER.  The default is 5, there
# is no upper limit but more than a couple of hundred are not productive.
# A better strategy may be to sysctl -w kern.timecounter.method=1

options 	NTIMECOUNTER=20

# The keyboard controller; it controls the keyboard and the PS/2 mouse.
device		atkbdc0	at isa? port IO_KBD

# The AT keyboard
device		atkbd0	at atkbdc? 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
#       0x04    Old-style (XT) keyboard support, useful for older ThinkPads

# PS/2 mouse
device		psm0	at atkbdc? 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

# The video card driver.
device		vga0	at isa? conflicts

# 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

# To include support for VESA video modes
options 	VESA

# Splash screen at start up!  Screen savers require this too.
pseudo-device	splash

# The pcvt console driver (vt220 compatible).
device		vt0	at isa?
options 	XSERVER			# support for running an X server.
options 	FAT_CURSOR		# start with block cursor
# This PCVT option is for keyboards such as those used on IBM ThinkPad laptops
options 	PCVT_SCANSET=2 		# IBM keyboards are non-std
# Other PCVT options are documented in pcvt(4).
options 	PCVT_24LINESDEF
options 	PCVT_CTRL_ALT_DEL
options 	PCVT_EMU_MOUSE
options 	PCVT_FREEBSD=211
options 	PCVT_META_ESC
options 	PCVT_NSCREENS=9
options 	PCVT_PRETTYSCRNS
options 	PCVT_SCREENSAVER
options 	PCVT_USEKBDSEC
options 	PCVT_VT220KEYB

# The syscons console driver (sco color console compatible).
device		sc0	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_DDBKEY	# 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)"

# 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

#
# The Numeric Processing eXtension driver.  In addition to this, you
# may configure a math emulator (see above).  If your machine has a
# hardware FPU and the kernel configuration includes the npx device
# *and* a math emulator compiled into the kernel, the hardware FPU
# will be used, unless it is found to be broken or unless "flags" to
# npx0 includes "0x08", which requests preference for the emulator.
device		npx0	at nexus? port IO_NPX flags 0x0 irq 13

#
# `flags' for npx0:
#	0x01	don't use the npx registers to optimize bcopy.
#	0x02	don't use the npx registers to optimize bzero.
#	0x04	don't use the npx registers to optimize copyin or copyout.
#	0x08	use emulator even if hardware FPU is available.
# The npx registers are normally used to optimize copying and zeroing when
# all of the following conditions are satisfied:
#	I586_CPU is an option
#	the cpu is an i586 (perhaps not a Pentium)
#	the probe for npx0 succeeds
#	INT 16 exception handling works.
# Then copying and zeroing using the npx registers is normally 30-100% faster.
# The flags can be used to control cases where it doesn't work or is slower.
# Setting them at boot time using userconfig works right (the optimizations
# are not used until later in the bootstrap when npx0 is attached).
# Flag 0x08 automatically disables the i586 optimized routines.
#

#
# Optional ISA and EISA devices:
#

#
# SCSI host adapters: `aha', `aic', `bt'
#
# adv: All Narrow SCSI bus AdvanSys controllers.
# adw: Second Generation AdvanSys controllers including the ADV940UW.
# aha: Adaptec 154x
# ahc: Adaptec 274x/284x/294x
# aic: Adaptec 152x
# bt: Most Buslogic controllers
#
# Note that the order is important in order for Buslogic cards to be
# probed correctly.
#

device		bt0	at isa? port IO_BT0
device		adv0	at isa?
device		adw
device		aha0	at isa?
device		aic0	at isa?

#
# Compaq Smart RAID controller.  This driver also uses the major number
# of wd, in order to be able to boot a pure RAID system.
# Only one line of each is needed, the code finds all available controllers
# and devices.
#
device		ida
device		id

#
# Mylex DAC960, AMI MegaRAID controllers.  Only one entry is needed; the code
# will find and configure all supported controllers.
#
device		mlx		# Mylex DAC960
device		amr		# AMI MegaRAID

#
# The 'ATA' driver supports all ATA and ATAPI devices.
# It can reuse the majors of wd.c for booting purposes.
# You only need one "device ata0" for it to find all
# PCI ATA/ATAPI devices on modern machines.
device		ata
device		atadisk		# ATA disk drives
device		atapicd		# ATAPI CDROM drives
device		atapifd		# ATAPI floppy drives
device		atapist		# ATAPI tape drives

#The folliwing options are valid on the ATA driver:
#
# ATA_STATIC_ID:	controller numbering is static (like the old driver)
#			else the device numbers are dynamically allocated.
# ATA_ENABLE_ATAPI_DMA:	enable DMA on ATAPI device, since many ATAPI devices
#			claim to support DMA but doesn't actually work, this
#			is not enabled as default.
# ATA_16BIT_ONLY:	for older HW that doesn't support 32bit transfers on
#			the ATA channels (mostly old ISA boards).

options 	ATA_STATIC_ID
options 	ATA_ENABLE_ATAPI_DMA
#options 	ATA_16BIT_ONLY

#
# For older non-PCI systems, these are the lines to use:
#device		ata0	at isa? port IO_WD1 irq 14
#device		ata1	at isa? port IO_WD2 irq 15

#
# ST-506, ESDI, and IDE hard disks: `wdc' and `wd'
#
# The flags fields are used to enable the multi-sector I/O and
# the 32BIT I/O modes.  The flags may be used in either the controller
# definition or in the individual disk definitions.  The controller
# definition is supported for the boot configuration stuff.
#
# Each drive has a 16 bit flags value defined:
#	The low 8 bits are the maximum value for the multi-sector I/O,
#	where 0xff defaults to the maximum that the drive can handle.
#	The high bit of the 16 bit flags (0x8000) allows probing for
#	32 bit transfers.  Bit 14 (0x4000) enables a hack to wake
#	up powered-down laptop drives.  Bit 13 (0x2000) allows
#	probing for PCI IDE DMA controllers, such as Intel's PIIX
#	south bridges. Bit 12 (0x1000) sets LBA mode instead of the
#	default CHS mode for accessing the drive. See the wd.4 man page.
#
# The flags field for the drives can be specified in the controller
# specification with the low 16 bits for drive 0, and the high 16 bits
# for drive 1.
# e.g.:
#device		wdc0	at isa? port IO_WD1 irq 14 flags 0x00ff8004
#
# specifies that drive 0 will be allowed to probe for 32 bit transfers and
# a maximum multi-sector transfer of 4 sectors, and drive 1 will not be
# allowed to probe for 32 bit transfers, but will allow multi-sector
# transfers up to the maximum that the drive supports.
#
# If you are using a PCI controller that is not running in compatibility
# mode (for example, it is a 2nd IDE PCI interface), then use config line(s)
# such as:
#
#device		wdc2	at isa? port 0 flags 0xa0ffa0ff
#device		wd4	at wdc2 drive 0
#device		wd5	at wdc2 drive 1
#
#device		wdc3	at isa? port 0 flags 0xa0ffa0ff
#device		wd6	at wdc3 drive 0
#device		wd7	at wdc3 drive 1
#
# Note that the above config would be useful for a Promise card, when used
# on a MB that already has a PIIX controller.  Note the bogus irq and port
# entries.  These are automatically filled in by the IDE/PCI support.
#
# This driver must be commented out because it is mutually exclusive with
# the ata(4) driver.
#
device		wdc0	at isa? port IO_WD1 irq 14
device		wd0	at wdc0 drive 0
device		wd1	at wdc0 drive 1
device		wdc1	at isa? port IO_WD2 irq 15
device		wd2	at wdc1 drive 0
device		wd3	at wdc1 drive 1

#
# This option allow you to override the default probe time for IDE
# devices, to get a faster probe.  Setting this below 10000 violate
# the IDE specs, but may still work for you (it will work for most
# people).
#
options 	IDE_DELAY=8000	# Be optimistic about Joe IDE device

# IDE CD-ROM & CD-R/RW  driver - requires wdc controller
device		wcd

# IDE floppy driver - requires wdc controller
device		wfd

# IDE tape driver - requires wdc controller
device		wst


#
# Standard floppy disk controllers and floppy tapes: `fdc', `fd', and `ft'
#
device		fdc0	at isa? port IO_FD1 irq 6 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 instead of the fdc0 line above 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:
#device fdc0 at isa? port IO_FD1 flags 1 irq 6 drq 2

device		fd0	at fdc0 drive 0
device		fd1	at fdc0 drive 1

# M-systems DiskOnchip products see src/sys/contrib/dev/fla/README
device		fla0	at isa?

#
# Other standard PC hardware: `mse', `sio', etc.
#
# mse: Logitech and ATI InPort bus mouse ports
# sio: serial ports (see sio(4))

device		mse0	at isa? port 0x23c irq 5

device		sio0	at isa? port IO_COM1 flags 0x10 irq 4

#
# `flags' for serial drivers that support consoles (only for sio now):
#	0x10	enable console support for this unit.  The other console flags
#		are ignored unless this is set.  Enabling console support does
#		not make the unit the preferred console - boot with -h or set
#		the 0x20 flag for that.  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.
#	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.
#	0x80	use this port for serial line gdb support in ddb.
#
# PnP `flags' (set via userconfig using pnp x flags y)
#	0x1	disable probing of this device.  Used to prevent your modem
#		from being attached as a PnP modem.
#

# Options for serial drivers that support consoles (only for sio now):
options 	BREAK_TO_DEBUGGER	#a BREAK on a comconsole goes to
					#DDB, if available.
options 	CONSPEED=9600		#default speed for serial console (default 9600)

# Options for sio:
options 	COM_ESP			#code for Hayes ESP
options 	COM_MULTIPORT		#code for some cards with shared IRQs

# 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.

#
# Network interfaces: `cx', `ed', `el', `ep', `ie', `is', `le', `lnc'
#
# ar: Arnet SYNC/570i hdlc sync 2/4 port V.35/X.21 serial driver (requires sppp)
# cs: IBM Etherjet and other Crystal Semi CS89x0-based adapters
# cx: Cronyx/Sigma multiport sync/async (with Cisco or PPP framing)
# ed: Western Digital and SMC 80xx; Novell NE1000 and NE2000; 3Com 3C503
# el: 3Com 3C501 (slow!)
# ep: 3Com 3C509
# ex: Intel EtherExpress Pro/10 and other i82595-based adapters
# fe: Fujitsu MB86960A/MB86965A Ethernet
# ie: AT&T StarLAN 10 and EN100; 3Com 3C507; unknown NI5210; Intel EtherExpress
# le: Digital Equipment EtherWorks 2 and EtherWorks 3 (DEPCA, DE100,
#     DE101, DE200, DE201, DE202, DE203, DE204, DE205, DE422)
# lnc: Lance/PCnet cards (Isolan, Novell NE2100, NE32-VL, AMD Am7990 & Am79C960)
# rdp: RealTek RTL 8002-based pocket ethernet adapters
# sr: RISCom/N2 hdlc sync 1/2 port V.35/X.21 serial driver (requires sppp)
# wl: Lucent Wavelan (ISA card only).
# 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.
# an: Aironet 4500/4800 802.11 wireless adapters. Supports the PCMCIA,
#     PCI and ISA varieties.
# xe: Xircom/Intel EtherExpress Pro100/16 PC Card ethernet controller.
# oltr: Olicom ISA token-ring adapters OC-3115, OC-3117, OC-3118 and OC-3133
#       (no options needed)
#
device ar0 at isa? port 0x300 irq 10 iomem 0xd0000
device cs0 at isa? port 0x300
device cx0 at isa? port 0x240 irq 15 drq 7
device ed0 at isa? port 0x280 irq 5 iomem 0xd8000
device el0 at isa? port 0x300 irq 9
device ep
device ex
device fe0 at isa? port 0x300
device ie0 at isa? port 0x300 irq 5 iomem 0xd0000
device ie1 at isa? port 0x360 irq 7 iomem 0xd0000
device le0 at isa? port 0x300 irq 5 iomem 0xd0000
device lnc0 at isa? port 0x280 irq 10 drq 0
device rdp0 at isa? port 0x378 irq 7 flags 2
device sr0 at isa? port 0x300 irq 5 iomem 0xd0000
device sn0 at isa? port 0x300 irq 10
device wi
device an
options 	WLCACHE		# enables the signal-strength cache
options 	WLDEBUG		# enables verbose debugging output
device wl0 at isa? port 0x300
device xe0 at isa?

device oltr0 at isa?

#
# ATM related options
#
# The `en' device provides support for Efficient Networks (ENI)
# ENI-155 PCI midway cards, and the Adaptec 155Mbps PCI ATM cards (ANA-59x0).
#
# atm pseudo-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.
#
# 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
#
pseudo-device	atm
device		en
options 	NATM			#native ATM

#
# Audio drivers: `snd', `sb', `pas', `gus', `pca'
#
# snd: Voxware sound support code
# sb: SoundBlaster PCM - SoundBlaster, SB Pro, SB16, ProAudioSpectrum
# sbxvi: SoundBlaster 16
# sbmidi: SoundBlaster 16 MIDI interface
# pas: ProAudioSpectrum PCM and MIDI
# gus: Gravis Ultrasound - Ultrasound, Ultrasound 16, Ultrasound MAX
# gusxvi: Gravis Ultrasound 16-bit PCM	(do not use)
# mss: Microsoft Sound System
# css: Crystal Sound System (CSS 423x PnP)
# sscape: Ensoniq Soundscape MIDI interface
# sscape_mss: Ensoniq Soundscape PCM (requires sscape)
# opl: Yamaha OPL-2 and OPL-3 FM - SB, SB Pro, SB 16, ProAudioSpectrum
# uart: stand-alone 6850 UART for MIDI
# mpu: Roland MPU-401 stand-alone card
#
# Note: It has been reported that ISA DMA with the SoundBlaster will
# lock up the machine (PR docs/5358).  If this happens to you,
# turning off USWC write posting in your machine's BIOS may fix
# the problem.
#
# Beware!  The addresses specified below are also hard-coded in
# src/sys/i386/isa/sound/sound_config.h.  If you change the values here, you
# must also change the values in the include file.
#
# pcm: PCM audio through various sound cards.
#
# This has support for a large number of new audio cards, based on
# CS423x, OPTi931, Yamaha OPL-SAx, and also for SB16, GusPnP.
# For more information about this driver and supported cards,
# see the pcm.4 man page.
#
# 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...).
#
# This driver will use the new PnP code if it's available.
#
# pca: PCM audio through your PC speaker
#
# If you have a GUS-MAX card and want to use the CS4231 codec on the
# card the drqs for the gus max must be 8 bit (1, 2, or 3).
#
# If you would like to use the full duplex option on the gus, then define
# flags to be the ``read dma channel''.
#
# options BROKEN_BUS_CLOCK	#PAS-16 isn't working and OPTI chipset
# options SYMPHONY_PAS		#PAS-16 isn't working and SYMPHONY chipset
# options EXCLUDE_SBPRO		#PAS-16
# options SBC_IRQ=5		#PAS-16. Must match irq on sb0 line.
# PAS16: The order of the pas0/sb0/opl0 is important since the
#	sb emulation is enabled in the pas-16 attach.
#
# To override the GUS defaults use:
# options GUS_DMA2
# options GUS_DMA
# options GUS_IRQ
#
# The src/sys/i386/isa/sound/sound.doc has more information.

# Controls all "VOXWARE" driver sound devices.  See Luigi's driver
# below for an alternate which may work better for some cards.
#
device		snd
device pas0	at isa? port 0x388 irq 10 drq 6
device sb0	at isa? port 0x220 irq 5 drq 1
device sbxvi0	at isa? drq 5
device sbmidi0	at isa? port 0x330
device awe0	at isa? port 0x620
device gus0	at isa? port 0x220 irq 12 drq 1
#device gus0	at isa? port 0x220 irq 12 drq 1 flags 0x3
device mss0	at isa? port 0x530 irq 10 drq 1
device css0	at isa? port 0x534 irq 5 drq 1 flags 0x08
device sscape0	at isa? port 0x330 irq 9 drq 0
device trix0	at isa? port 0x330 irq 6 drq 0
device sscape_mss0 at isa? port 0x534 irq 5 drq 1
device opl0	at isa? port 0x388
device mpu0	at isa? port 0x330 irq 6 drq 0
device uart0	at isa? port 0x330 irq 5

# The newpcm driver (use INSTEAD of snd0 and all VOXWARE drivers!).
# Note that motherboard sound devices may require options PNPBIOS.
#
# For non-pnp sound cards with no bridge drivers only:
#device		pcm0 at isa? irq 10 drq 1 flags 0x0
#
# For pnp sound cards:
#device		pcm

# The bridge drivers for sound cards. Do not forget pcm as well.
#
# sbc:  Creative SoundBlaster ISA PnP/non-PnP
#	Supports ESS and Avance ISA chips as well.
# gusc: Gravis UltraSound ISA PnP/non-PnP
# csa:  Crystal Semiconductor CS461x/428x PCI

# For PnP or PCI cards:
#device		sbc
#device		gusc
#device		csa

# For non-PnP cards:
#device		sbc0	at isa? port 0x220 irq 5 drq 1 flags 0x15
#device		gusc0	at isa? port 0x220 irq 5 drq 1 flags 0x13

# Not controlled by `snd'
device		pca0 at isa? port IO_TIMER1

#
# Miscellaneous hardware:
#
# mcd: Mitsumi CD-ROM
# scd: Sony CD-ROM
# matcd: Matsushita/Panasonic CD-ROM
# wt: Wangtek and Archive QIC-02/QIC-36 tape drives
# ctx: Cortex-I frame grabber
# apm: Laptop Advanced Power Management (experimental)
# spigot: The Creative Labs Video Spigot video-acquisition board
# meteor: Matrox Meteor video capture board
# bktr: Brooktree bt848/848a/849a/878/879 video capture and TV Tuner board
# cy: Cyclades serial driver
# dgb: Digiboard PC/Xi and PC/Xe series driver (ALPHA QUALITY!)
# dgm: Digiboard PC/Xem driver
# gp:  National Instruments AT-GPIB and AT-GPIB/TNT board
# asc: GI1904-based hand scanners, e.g. the Trust Amiscan Grey
# gsc: Genius GS-4500 hand scanner.
# joy: joystick
# labpc: National Instrument's Lab-PC and Lab-PC+
# rc: RISCom/8 multiport card
# rp: Comtrol Rocketport(ISA) - single card
# tw: TW-523 power line interface for use with X-10 home control products
# si: Specialix SI/XIO 4-32 port terminal multiplexor
# stl: Stallion EasyIO and EasyConnection 8/32 (cd1400 based)
# stli: Stallion EasyConnection 8/64, ONboard, Brumby (intelligent)

# Notes on APM
#  The flags takes the following meaning for apm0:
#    0x0020  Statclock is broken.
#  If apm is omitted, some systems require sysctl -w kern.timecounter.method=1
#  for correct timekeeping.

# Notes on the spigot:
#  The video spigot is at 0xad6.  This port address can not be changed.
#  The irq values may only be 10, 11, or 15
#  I/O memory is an 8kb region.  Possible values are:
#    0a0000, 0a2000, ..., 0fffff, f00000, f02000, ..., ffffff
#    The start address must be on an even boundary.
#  Add the following option if you want to allow non-root users to be able
#  to access the spigot.  This option is not secure because it allows users
#  direct access to the I/O page.
#  	options SPIGOT_UNSECURE

# 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:
#
#   Comtrol Rocketport ISA single card
#               device  rp0     at isa? 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 configuration file:
#
#               device  rp0     at isa? port 0x100
#               device  rp1     at isa? port 0x180
#
#   For 4 ISA cards, it might be something like this:
#
#               device  rp0     at isa? port 0x180
#               device  rp1     at isa? port 0x100
#               device  rp2     at isa? port 0x340
#               device  rp3     at isa? port 0x240
#
#   And for PCI cards, you only need say:
#
#               device rp

# Notes on the Digiboard driver:
#
# The following flag values have special meanings:
#	0x01 - alternate layout of pins (dgb & dgm)
#	0x02 - use the windowed PC/Xe in 64K mode (dgb only)

# Notes on the Specialix SI/XIO driver:
#  **This is NOT a Specialix supported Driver!**
#  The host card is memory, not IO mapped.
#  The Rev 1 host cards use a 64K chunk, on a 32K boundary.
#  The Rev 2 host cards use a 32K chunk, on a 32K boundary.
#  The cards can use an IRQ of 11, 12 or 15.

# Notes on the Stallion stl and stli drivers:
#  See src/i386/isa/README.stl for complete instructions.
#  This is version 0.0.5alpha, unsupported by Stallion.
#  The stl driver has a secondary IO port hard coded at 0x280.  You need
#     to change src/i386/isa/stallion.c if you reconfigure this on the boards.
#  The "flags" and "iosiz" settings on the stli driver depend on the board:
#	EasyConnection 8/64 ISA:     flags 23         iosiz 0x1000
#	EasyConnection 8/64 EISA:    flags 24         iosiz 0x10000
#	EasyConnection 8/64 MCA:     flags 25         iosiz 0x1000
#	ONboard ISA:                 flags 4          iosiz 0x10000
#	ONboard EISA:                flags 7          iosiz 0x10000
#	ONboard MCA:                 flags 3          iosiz 0x10000
#	Brumby:                      flags 2          iosiz 0x4000
#	Stallion:                    flags 1          iosiz 0x10000

device		mcd0	at isa? port 0x300 irq 10
# for the Sony CDU31/33A CDROM
device		scd0	at isa? port 0x230
# for the SoundBlaster 16 multicd - up to 4 devices
device		matcd0  at isa? port 0x230
device		wt0	at isa? port 0x300 irq 5 drq 1
device		ctx0	at isa? port 0x230 iomem 0xd0000
device		spigot0 at isa? port 0xad6 irq 15 iomem 0xee000
device		apm0
device		gp0	at isa? port 0x2c0
device		gsc0	at isa? port IO_GSC1 drq 3
device		joy0	at isa? port IO_GAME
device		cy0	at isa? irq 10 iomem 0xd4000 iosiz 0x2000
options 	CY_PCI_FASTINTR		# Use with cy_pci unless irq is shared
device		dgb0	at isa? port 0x220 iomem 0xfc000
options 	NDGBPORTS=16		# Defaults to 16*NDGB
device		dgm0	at isa? port 0x104 iomem 0xd0000
device		labpc0	at isa? port 0x260 irq 5
device		rc0	at isa? port 0x220 irq 12
device		rp0	at isa? port 0x280
# the port and irq for tw0 are fictitious
device		tw0	at isa? port 0x380 irq 11
device		si0	at isa? iomem 0xd0000 irq 12
device		asc0	at isa? port IO_ASC1 drq 3 irq 10
device		stl0	at isa? port 0x2a0 irq 10
device		stli0	at isa? port 0x2a0 iomem 0xcc000 flags 23 iosiz 0x1000
# You are unlikely to have the hardware for loran0 <phk@FreeBSD.org>
device		loran0	at isa? irq 5
# HOT1 Xilinx 6200 card (http://www.vcc.com/)
device		xrpu

#
# MCA devices:
#
# The MCA bus device is mca0.  It provides auto-detection and
# configuration support for all devices on the MCA bus.
#
# The 'aha' device provides support for the Adaptec 1640
#
# The 'bt' device provides support for various Buslogic/Bustek
# and Storage Dimensions SCSI adapters.
#
# The 'ep' device provides support for the 3Com 3C529 ethernet card.
#
device		mca

#
# EISA devices:
#
# The EISA bus device is eisa0.  It provides auto-detection and
# configuration support for all devices on the EISA bus.
#
# The `ahb' device provides support for the Adaptec 174X adapter.
#
# The `ahc' device provides support for the Adaptec 274X and 284X
# adapters.  The 284X, although a VLB card, responds to EISA probes.
#
# fea: DEC DEFEA EISA FDDI adapter
#
device		eisa
device		ahb
device		ahc
device		fea

# 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

# 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

# By default, only 10 EISA slots are probed, since the slot numbers
# above clash with the configuration address space of the PCI subsystem,
# and the EISA probe is not very smart about this.  This is sufficient
# for most machines, but in particular the HP NetServer LC series comes
# with an onboard AIC7770 dual-channel SCSI controller on EISA slot #11,
# thus you need to bump this figure to 12 for them.
options 	EISA_SLOTS=12

#
# PCI devices & PCI options:
#
# The main PCI bus device is `pci'.  It provides auto-detection and
# configuration support for all devices on the PCI bus, using either
# configuration mode defined in the PCI specification.

device		pci

# PCI options
#
#options 	PCI_QUIET	#quiets PCI code on chipset settings


# The `ahc' device provides support for the Adaptec 29/3940(U)(W)
# and motherboard based AIC7870/AIC7880 adapters.
#
# The `amd' device provides support for the AMD 53C974 SCSI host
# adapter chip as found on devices such as the Tekram DC-390(T).
#
# The `ncr' device provides support for the NCR 53C810 and 53C825
# self-contained SCSI host adapters.
#
# The `isp' device provides support for the Qlogic ISP 1020, 1040
# nd 1040B PCI SCSI host adapters, as well as the Qlogic ISP 2100
# FC/AL Host Adapter.
#
# The `dc' device provides 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.
#
# The `de' device provides support for the Digital Equipment DC21040
# self-contained Ethernet adapter.
#
# The `fxp' device provides support for the Intel EtherExpress Pro/100B
# PCI Fast Ethernet adapters.
#
# The 'rl' device provides 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.
#
# The 'sf' device provides 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.
#
# The 'ste' device provides support for adapters based on the Sundance
# Technologies ST201 PCI fast ethernet controller. This includes the
# D-Link DFE-550TX.
#
# The 'sis' device provides support for adapters based on the Silicon
# Integrated Systems SiS 900 and SiS 7016 PCI fast ethernet controller
# chips.
#
# The 'sk' device provides 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.
#
# The 'ti' device provides 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.
#
# The 'tl' device provides 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.
#
# The `tx' device provides support for the SMC 9432TX cards.
#
# The `vr' device provides 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.
#
# The `vx' device provides support for the 3Com 3C590 and 3C595
# early support
#
# The `wb' device provides support for various fast ethernet adapters
# based on the Winbond W89C840F chip. Note: this is not the same as
# the Winbond W89C940F, which is an NE2000 clone.
#
# The `wx' device provides support for the Intel Gigabit Ethernet
# PCI card (`Wiseman').
#
# The `xl' device provides support for the 3Com 3c900, 3c905 and
# 3c905B (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.
#
# The `fpa' device provides support for the Digital DEFPA PCI FDDI
# adapter. pseudo-device fddi is also needed.
#
# The `meteor' device is a PCI video capture board. It can also have the
# following options:
#   options METEOR_ALLOC_PAGES=xxx	preallocate kernel pages for data entry
#	figure (ROWS*COLUMN*BYTES_PER_PIXEL*FRAME+PAGE_SIZE-1)/PAGE_SIZE
#   options METEOR_DEALLOC_PAGES	remove all allocated pages on close(2)
#   options METEOR_DEALLOC_ABOVE=xxx	remove all allocated pages above the
#	specified amount. If this value is below the allocated amount no action
#	taken
#   options METEOR_SYSTEM_DEFAULT={METEOR_PAL|METEOR_NTSC|METEOR_SECAM}, used
#	for initialization of fps routine when a signal is not present.
#
# 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, eg 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
# Specifes the default video capture mode.
# This is required for Dual Crystal (28&35Mhz) boards where PAL is used
# to prevent hangs during initialisation.  eg VideoLogic Captivator PCI.
#
# options 	BKTR_USE_PLL
# PAL or SECAM users who have a 28Mhz crystal (and no 35Mhz crystal)
# must enable PLL mode with this option. eg 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
#
#
# The oltr driver supports the following Olicom PCI token-ring adapters
# OC-3136, OC-3137, OC-3139, OC-3140, OC-3141, OC-3540, OC-3250
#
device		ahc		# AHA2940 and onboard AIC7xxx devices
device		amd		# AMD 53C974 (Teckram DC-390(T))
device		isp		# Qlogic family
device		ncr		# NCR/Symbios Logic
device		sym		# NCR/Symbios Logic (newer chipsets)
#
# Options for ISP
#
#	SCSI_ISP_NO_FWLOAD_MASK	- mask of isp unit numbers (obviously
#				  a max of 32) that you wish to disable
#				  to disable the loading of firmware on.
#	SCSI_ISP_NO_NVRAM_MASK	- mask of isp unit numbers (obviously
#				  a max of 32) that you wish to disable
#				  them picking up information from NVRAM
#				  (for broken cards you can't fix the NVRAM
#				  on- very rare, or for systems you can't
#				  change NVRAM on (e.g. alpha) and you don't
#				  like what's in there)
#	SCSI_ISP_PREFER_MEM_MAP	- control preference for using memory mappings
#				  instead of I/O space mappings. It defaults
#				  to 1 for i386, 0 for alpha. Set to 1 to
#				  unconditionally prefer mapping memory,
#				  else it will use I/O space mappings. Of
#				  course, this can fail if the PCI implement-
#				  ation doesn't support what you want.
#
#	SCSI_ISP_FCDUPLEX	- mask of isp unit numbers (obviously
#				  a max of 32) that you wish to set fibre
#				  channel full duplex mode on.
#				  to disable the loading of firmware on.
#	SCSI_ISP_FABRIC		  enable loading of Fabric f/w flavor (2100).
#	SCSI_ISP_SCCLUN		  enable loading of expanded lun f/w (2100).
#	SCSI_ISP_WWN		- define a WWN to use as a default
#
#	ISP_DISABLE_1020_SUPPORT	Disable support for 1020/1040 cards
#	ISP_DISABLE_1080_SUPPORT	Disable support for 1080/1240 cards
#	ISP_DISABLE_2100_SUPPORT	Disable support for 2100 cards
#	(these really just to save code space)
#	(use of all three will cause the driver to not compile)
#
#	ISP_COMPILE_FW		-	compile all firmware in
#	ISP_COMPILE_1020_FW	-	compile in 1020/1040 firmware
#	ISP_COMPILE_1080_FW	-	compile in 1080/1240/1280 firmware
#	ISP_COMPILE_2100_FW	-	compile in 2100 firmware
#	ISP_COMPILE_2200_FW	-	compile in 2200 firmware
#
#	ISP_TARGET_MODE		-	enable target mode operation
#
options 	SCSI_ISP_NO_FWLOAD_MASK=0x12	# disable FW load for isp1, isp4
options 	SCSI_ISP_NO_NVRAM_MASK=0x1	# disable NVRAM for isp0
options 	SCSI_ISP_PREFER_MEM_MAP=0	# prefer I/O mapping
options 	SCSI_ISP_FCDUPLEX=0x4		# isp2 is a Fibre Channel card
						# we want in full duplex mode.
options 	SCSI_ISP_WWN="0x5000000099990000"
#options 	ISP_DISABLE_1020_SUPPORT
#options 	ISP_DISABLE_1080_SUPPORT
#options 	ISP_DISABLE_2100_SUPPORT
#options 	ISP_COMPILE_1020_FW=1
#options 	ISP_COMPILE_1080_FW=1
#options 	ISP_COMPILE_2100_FW=1
#options 	ISP_COMPILE_2200_FW=1
#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]


# MII bus support is required for some PCI 10/100 ethernet NICs,
# namely those which use MII-compliant transceivers or implement
# tranceiver 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

# PCI Ethernet NICs that use the common MII bus controller code.
device		dc		# DEC/Intel 21143 and various workalikes
device		rl		# RealTek 8129/8139
device		sf		# Adaptec AIC-6915 (``Starfire'')
device		sis		# Silicon Integrated Systems SiS 900/SiS 7016
device		ste		# Sundance ST201 (D-Link DFE-550TX)
device		tl		# Texas Instruments ThunderLAN
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		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
device		tx		# SMC 9432TX (83c170 ``EPIC'')
device		vx		# 3Com 3c590, 3c595 (``Vortex'')

device		sk
device		ti
device		wx
device		fpa
device		meteor
#The oltr driver in the ISA section will also find PCI cards.
#device		oltr0


# 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
# 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

#
# PCCARD/PCMCIA
#
# card: pccard slots
# pcic: isa/pccard bridge
device		pcic0 at isa?
device		pcic1 at isa?
device		card

# You may need to reset all pccards after resuming
options 	PCIC_RESUME_RESET	# reset after resume

#
# Laptop/Notebook options:
#
# See also:
#  apm under `Miscellaneous hardware'
# above.

# For older notebooks that signal a powerfail condition (external
# power supply dropped, or battery state low) by issuing an NMI:

options 	POWERFAIL_NMI	# make it beep instead of panicing

#
# SMB bus
#
# System Management Bus support provided by the 'smbus' device.
#
# Supported devices:
# smb	standard io
#
# Supported interfaces:
# iicsmb I2C to SMB bridge with any iicbus interface
# bktr	brooktree848 I2C hardware interface
# intpm	Intel PIIX4 Power Management Unit
# alpm	Acer Aladdin-IV/V/Pro2 Power Management Unit
#
device		smbus		# Bus support, required for smb below.
device		intpm
device		alpm

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:
# pcf	Philips PCF8584 ISA-bus controller
# 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

device		pcf0	at isa? port 0x320 irq 5

# ISDN4BSD section
#
# See /usr/share/examples/isdn/ROADMAP for an introduction to isdn4bsd.
#
# i4b passive ISDN cards support (isic - I4b Siemens Isdn Chipset driver)
# note that the ``options'' and ``device'' lines must BOTH be defined !
#
# Driver entries marked "(not supported yet!)" are not working currently
# due to not being converted to newbus. We hope to get them back to support
# in the near future.
#
# ISA bus non-PnP Cards:
# ----------------------
#
# Teles S0/8 or Niccy 1008
options 	TEL_S0_8
device		isic0	at isa? iomem 0xd0000 irq 5 flags 1
#
# Teles S0/16 or Creatix ISDN-S0 or Niccy 1016
options 	TEL_S0_16
#device		isic0	at isa? port 0xd80 iomem 0xd0000 irq 5 flags 2
#
# Teles S0/16.3
options 	TEL_S0_16_3
#device		isic0	at isa? port 0xd80 irq 5 flags 3
#
# AVM A1 or AVM Fritz!Card
options 	AVM_A1
#device		isic0	at isa? port 0x340 irq 5 flags 4
#
# USRobotics Sportster ISDN TA intern (not supported yet!)
#options 	USR_STI
#device		isic0	at isa? port 0x268 irq 5 flags 7
#
# ITK ix1 Micro ( < V.3, non-PnP version ) (not supported yet!)
#options 	ITKIX1
#device		isic0	at isa? port 0x398 irq 10 flags 18
#
# ELSA PCC-16
options 	"ELSA_PCC16"
#device		isic0	at isa? port 0x360 irq 10 flags 20
#
# ISA bus PnP Cards:
# ------------------
#
# Teles S0/16.3 PnP
options 	TEL_S0_16_3_P
#device		isic
#
# Creatix ISDN-S0 P&P
options 	CRTX_S0_P
#device		isic
#
# Dr. Neuhaus Niccy Go@
options 	DRN_NGO
#device		isic
#
# Sedlbauer Win Speed
options 	SEDLBAUER
#device		isic
#
# Dynalink IS64PH (not supported yet!)
#options 	DYNALINK 
#device		isic
#
# ELSA QuickStep 1000pro ISA
options 	ELSA_QS1ISA
#device		isic
#
# ITK ix1 Micro ( V.3, PnP version ) (not supported yet!)
#options 	"ITKIX1"
#device		isic
#
# AVM Fritz!Card PnP (not supported yet!)
#options 	"AVM_PNP"
#device 	isic
#
# Siemens I-Surf 2.0
options 	"SIEMENS_ISURF2"
#device		isic
#
# PCI bus Cards:
# --------------
#
# ELSA MicroLink ISDN/PCI (same as ELSA QuickStep 1000pro PCI)
options 	ELSA_QS1PCI
#device		isic
#
# AVM Fritz!Card PCI
options 	"AVM_A1_PCI"
#device		isic
#
# PCMCIA Cards:
# -------------
#
# AVM PCMCIA Fritz!Card (not supported yet!)
#options 	AVM_A1_PCMCIA
#device		isic0	at isa? port 0x340 irq 5 flags 10
#
# Active Cards:
# -------------
#
# Stollmann Tina-dd control device 
# (driver under development, not fully functional!)
device		tina0	at isa? port 0x260 irq 10
#
# ISDN Protocol Stack
# -------------------
#
# Q.921 / layer 2 - i4b passive cards D channel handling
pseudo-device	"i4bq921"
#
# Q.931 / layer 3 - i4b passive cards D channel handling
pseudo-device	"i4bq931"
#
# layer 4 - i4b common passive and active card handling
pseudo-device	"i4b"
#
# ISDN devices
# ------------
#
# userland driver to do ISDN tracing (for passive cards only)
pseudo-device	"i4btrc"	4
#
# userland driver to control the whole thing
pseudo-device	"i4bctl"
#
# userland driver for access to raw B channel
pseudo-device	"i4brbch"	4
#
# userland driver for telephony
pseudo-device	"i4btel"	2
#
# network driver for IP over raw HDLC ISDN
pseudo-device	"i4bipr"	4
# enable VJ header compression detection for ipr i/f
options 	IPR_VJ
# enable logging of the first n IP packets to isdnd (n=32 here)
#options	IPR_LOG=32
#
# network driver for sync PPP over ISDN
pseudo-device	"i4bisppp"	4


# 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 a 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		ppc0	at isa? 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
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 tie-ins for a hardware watchdog.  This only enable the hooks;
# the user must still supply the actual driver.
#
options 	HW_WDOG

#
# Set the number of PV entries per process.  Increasing this can
# stop panics related to heavy use of shared memory. However, that can
# (combined with large amounts of physical memory) cause panics at
# boot time due the kernel running out of VM space.
#
# If you're tweaking this, you might also want to increase the sysctls
# "vm.v_free_min", "vm.v_free_reserved", and "vm.v_free_target".
#
# The value below is the one more than the default.
#
options 	PMAP_SHPGPERPROC=201

#
# Disable swapping. 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

#
# SysVR4 ABI emulation
#
# The svr4 ABI emulator can be statically compiled into the kernel or loaded as
# a KLD module.  
# The STREAMS network emulation code can also be compiled statically or as a 
# module.  If loaded as a module, it must be loaded before the svr4 module
# (the /usr/sbin/svr4 script does this for you).  If compiling statically,
# the `streams' pseudo-device must be configured into any kernel which also
# specifies COMPAT_SVR4.  It is possible to have a statically-configured 
# STREAMS device and a dynamically loadable svr4 emulator;  the /usr/sbin/svr4
# script understands that it doesn't need to load the `streams' module under
# those circumstances.
# Caveat:  At this time, `options KTRACE' is required for the svr4 emulator
# (whether static or dynamic).  
# 
options		COMPAT_SVR4	# build emulator statically
options		DEBUG_SVR4	# enable verbose debugging
pseudo-device	streams		# STREAMS network driver (required for svr4).

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

options 	AHC_DUMP_EEPROM
options 	AHC_TMODE_ENABLE
options 	ATA_16BIT_ONLY
options 	ATA_STATIC_ID
options 	BUS_DEBUG
options 	CAM_DEBUG_DELAY
options 	CLK_CALIBRATION_LOOP
options 	CLK_USE_I8254_CALIBRATION
options 	CLK_USE_TSC_CALIBRATION
options 	CLUSTERDEBUG
options 	COMPAT_LINUX
options 	CPU_UPGRADE_HW_CACHE
options 	DEBUG
options 	DEBUG_LINUX
options 	DEBUG_VFS_LOCKS
#options 	DISABLE_PSE
options 	ENABLE_ALART
options 	ENABLE_VFS_IOOPT
options 	FB_DEBUG
options 	FB_INSTALL_CDEV
options 	FE_8BIT_SUPPORT
options 	I4B_SMP_WORKAROUND
options 	I586_PMC_GUPROF=0x70000
options 	IBCS2
options 	KBDIO_DEBUG=2
options 	KBD_MAXRETRY=4
options 	KBD_MAXWAIT=6
options 	KBD_RESETDELAY=201
options 	KEY
options 	LOCKF_DEBUG
options 	LOUTB
options 	MSGMNB=2049
options 	MSGMNI=41
options 	MSGSEG=2049
options 	MSGSSZ=16
options 	MSGTQL=41
options 	NBUF=512
options 	NETATALKDEBUG
options 	NMBCLUSTERS=1024
options 	NPX_DEBUG
#options 	OLTR_NO_BULLSEYE_MAC
#options 	OLTR_NO_HAWKEYE_MAC
#options 	OLTR_NO_TMS_MAC
options 	PANIC_REBOOT_WAIT_TIME=16
options 	PNPBIOS
options 	PSM_DEBUG=1
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
options 	SC_RENDER_DEBUG
options 	SEMMAP=31
options 	SEMMNI=11
options 	SEMMNS=61
options 	SEMMNU=31
options 	SEMMSL=61
options 	SEMOPM=101
options 	SEMUME=11
options 	SHMALL=1025
options 	SHMMAX="(SHMMAXPGS*PAGE_SIZE+1)"
options 	SHMMAXPGS=1025
options 	SHMMIN=2
options 	SHMMNI=33
options 	SHMSEG=9
options 	SHOW_BUSYBUFS	# List buffers that prevent root unmount
options 	SIMPLELOCK_DEBUG
options 	SI_DEBUG
options 	SLIP_IFF_OPTS
options 	SPX_HACK
options 	TIMER_FREQ="((14318182+6)/12)"
options 	VFS_BIO_DEBUG
options 	VM_KMEM_SIZE
options 	VM_KMEM_SIZE_MAX
options 	VM_KMEM_SIZE_SCALE

# Undocumented options covering presently broken code
#options 	ASUSCOM_IPAC

# The 'dpt' driver provides support for 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
options 	DPT_ALLOW_MEMIO

# USB support
# UHCI controller
device		uhci
# OHCI controller
device		ohci
# General USB code (mandatory for USB)
device		usb
#
# 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
device		umass
# USB mouse
device		ums
#
# 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
#
# 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

# debugging options for the USB subsystem
#
options 	UHCI_DEBUG
options 	OHCI_DEBUG
options 	USB_DEBUG

options 	UGEN_DEBUG
options 	UHID_DEBUG
options 	UHUB_DEBUG
options 	UKBD_DEBUG
options 	ULPT_DEBUG
options 	UMASS_DEBUG
options 	UMS_DEBUG

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

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