FreeBSD/Linux Kernel Cross Reference
sys/i386/conf/LINT

     #
     # LINT -- config file for checking all the sources, tries to pull in
     #       as much of the source tree as it can.
     #
     # $FreeBSD$
     #
     # 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 formula defined in subr_param.c.  Setting
    # maxusers 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/snd sound/pcm sound/driver/maestro3"
    
    #
    # 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.  MAXSSIZ is the maximum that the stack limit can be
    # set to.  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         MAXSSIZ="(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 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.
    options         PQ_CACHESIZE=512        # color for 512k/16k cache
    # Deprecated options supported for backwards compatibility.
    #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 256k/16k cache
    #options        PQ_NORMALCACHE          # color for 64k/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 -n 3 /kernel | sed -n 's/^___//p' > MYKERNEL
    #
    options         INCLUDE_CONFIG_FILE     # Include this file in kernel
    
    #
    # 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\"
   
   
   #####################################################################
   # SMP OPTIONS:
   #
   # SMP enables building of a Symmetric MultiProcessor Kernel.
   # APIC_IO enables the use of the IO APIC for Symmetric I/O.
   #
   # 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
   
   #
   # 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_ATHLON_SSE_HACK tries to enable SSE instructions when the BIOS has
   # forgotten to enable them.
   #
   # 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_ENABLE_SSE enables SSE/MMX2 instructions support.
   #
   # CPU_ENABLE_TCC enables Thermal Control Circuitry (TCC) found in some
   # Pentium(tm) 4 and (possibly) later CPUs.  When enabled and detected,
   # TCC allows to restrict power consumption by using group of hw.p4tcc.*
   # sysctls.  This operates independently of SpeedStep and is useful on
   # systems where other mechanisms such as apm(4) or acpi(4) don't work.
   #
   # 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_L2_LATENCY specifed the L2 cache latency value.  This option is used
   # only when CPU_PPRO2CELERON is defined and Mendocino Celeron is detected.
   # The default value is 5.
   #
   # CPU_ELAN enables support for AMDs ElanSC520 CPU.
   #
   # 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_PPRO2CELERON enables L2 cache of Mendocino Celeron CPUs.  This option
   # is useful when you use Socket 8 to Socket 370 converter, because most Pentium
   # Pro BIOSs do not enable L2 cache of Mendocino Celeron CPUs.
   #
   # 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 option is only needed if I586_CPU is also defined,
   # and should be included for any non-Pentium CPU that defines it.
   #
   # 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_ATHLON_SSE_HACK
   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_ELAN
   options         CPU_ENABLE_SSE
   options         CPU_FASTER_5X86_FPU
   options         CPU_I486_ON_386
   options         CPU_IORT
   options         CPU_L2_LATENCY=5
   options         CPU_LOOP_EN
   options         CPU_PPRO2CELERON
   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 applications running in user space to control the Local Descriptor
   # Table (LDT).  This is required by some ports.  Future versions of FreeBSD
   # may require this option for some programs in the base system.
   #
   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.
   #
   # System V shared memory and tunable parameters
   options         SYSVSHM         # include support for shared memory
   options         SHMMAXPGS=1025  # max amount of shared memory pages (4k on i386)
   options         SHMALL=1025     # max number of shared memory pages system wide
   options         SHMMAX="(SHMMAXPGS*PAGE_SIZE+1)"
                                   # max shared memory segment size (bytes)
   options         SHMMIN=2        # min shared memory segment size (bytes)
   options         SHMMNI=33       # max number of shared memory identifiers
   options         SHMSEG=9        # max shared memory segments per process
   
   # System V semaphores and tunable parameters
   options         SYSVSEM         # include support for semaphores
   options         SEMMAP=31       # amount of entries in semaphore map
   options         SEMMNI=11       # number of semaphore identifiers in the system
   options         SEMMNS=61       # number of semaphores in the system
   options         SEMMNU=31       # number of undo structures in the system
   options         SEMMSL=61       # max number of semaphores per id
   options         SEMOPM=101      # max number of operations per semop call
   options         SEMUME=11       # max number of undo entries per process
   
   # System V message queues and tunable parameters
   options         SYSVMSG         # include support for message queues
   options         MSGMNB=2049     # max characters per message queue
   options         MSGMNI=41       # max number of message queue identifiers
   options         MSGSEG=2049     # max number of message segments in the system
   options         MSGSSZ=16       # size of a message segment MUST be power of 2
   options         MSGTQL=41       # max amount of messages in the system
   
   
   #####################################################################
   # 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
   
   
   #####################################################################
   # 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_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.
   #
   # Note that enabling this can be problematic as there are no mechanisms
   # in place for distinguishing packets coming out of a tunnel (e.g. no
   # encX devices as found on openbsd).
   #
   #options        IPSEC_FILTERGIF         #filter ipsec packets from a tunnel
   
   #
   # Experimental IPsec implementation that uses the kernel crypto
   # framework.  This cannot be configured together with IPSEC and
   # (currently) supports only IPv4.  To use this you must also
   # configure the crypto device (see below).  Note that with this
   # you get all the IPsec protocols (e.g. there is no FAST_IPSEC_ESP).
   # IPSEC_DEBUG is used, as above, to configure debugging support
   # within the IPsec protocols.
   #
   #options        FAST_IPSEC              #new IPsec
   
   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
   #options        NSIP                    #XNS over IP
   
   #
   # 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               #mbuf management library
   
   # 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_ETHER
   options         NETGRAPH_FRAME_RELAY
   options         NETGRAPH_HOLE
   options         NETGRAPH_IFACE
   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_ONE2MANY
   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 `arcnet' pseudo-device provides generic code to support Arcnet.
   #  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.  This shows up as the 'ds' interface.
   #  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 `gre' device implements two types of IP4 over IP4 tunneling:
   #  GRE and MOBILE, as specified in the RFC1701 and RFC2004.
   #  The `faith' pseudo-device captures packets sent to it and diverts them
   #  to the IPv4/IPv6 translation daemon.
   #  The `stf' device implements 6to4 encapsulation.
   #  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   vlan    1               #VLAN support
   pseudo-device   token                   #Generic TokenRing
   pseudo-device   fddi                    #Generic FDDI
   pseudo-device   arcnet                  #Generic Arcnet
   pseudo-device   sppp                    #Generic Synchronous PPP
   pseudo-device   loop                    #Network loopback device
   pseudo-device   bpf                     #Berkeley packet filter
   pseudo-device   disc                    #Discard device (ds0, ds1, etc)
   pseudo-device   tun                     #Tunnel driver (ppp(8), nos-tun(8))
   pseudo-device   tap                     #Ethernet tunnel driver (tap(4))
   pseudo-device   sl      2               #Serial Line IP
   pseudo-device   gre                     #IP over IP tunneling
   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                     #IPv6 and IPv4 tunneling
   pseudo-device   faith   1               #for IPv6 and IPv4 translation
   pseudo-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''
   #
   # 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         MROUTING                # Multicast routing
   options         PIM                     # Protocol Independent Multicast
   options         IPFIREWALL              #firewall
   options         IPFIREWALL_VERBOSE      #enable logging to syslogd(8)
   options         IPFIREWALL_FORWARD      #enable transparent proxy support
   options         IPFIREWALL_VERBOSE_LIMIT=100    #limit verbosity
   options         IPFIREWALL_DEFAULT_TO_ACCEPT    #allow everything by default
   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_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 the mbuf(9) manpage for a list of available
   # test cases.
   options         MBUF_STRESS_TEST
   
   # RANDOM_IP_ID causes the ID field in IP packets to be randomized
   # instead of incremented by 1 with each packet generated.  This
   # option closes a minor information leak which allows remote
   # observers to determine the rate of packet generation on the
   # machine by watching the counter.
   options         RANDOM_IP_ID
   
   # 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
   
   # 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) and ipfw(8) manpages 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
   
   #
   # 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.
   #
   # The `proatm' driver provides support for cards based on the IDT77252 chip
   # like ProSum's ProATM cards.
   #
   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
   device          proatm                  #ProSum's ProATM-155
   
   # DEVICE_POLLING adds support for mixed interrupt-polling handling
   # of network device drivers, which has significant benefits in terms
   # of robustness to overloads and responsivity, as well as permitting
   # accurate scheduling of the CPU time between kernel network processing
   # and other activities. The drawback is a moderate (up to 1/HZ seconds)
   # potential increase in response times.
   # It is strongly recommended to use HZ=1000 or 2000 with DEVICE_POLLING
   # to achieve smoother behaviour.
   # Additionally, you can enable/disable polling at runtime with the
   # sysctl variable kern.polling.enable (defaults off), and select
   # the CPU fraction reserved to userland with the sysctl variable
   # kern.polling.user_frac (default 50, range 0..100).
   #
   # Not all device drivers support this mode of operation at the time of
   # this writing.  See polling(4) for more details.
    
   options         DEVICE_POLLING
   
   
   #####################################################################
   # 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         SMBFS                   #SMB/CIFS 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
   
   # Soft updates is technique for improving file system speed and
   # making abrupt shutdown less risky.
   options         SOFTUPDATES
   
   # 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
   
   # Specify double the default maximum size for malloc(9)-backed md devices.
   options         MD_NSECT=40000
   
   # Allow this many swap-devices.
   #
   # In order to manage swap, the system must reserve bitmap space that
   # scales with the largest mounted swap device multiplied by NSWAPDEV, 
   # irregardless of whether other swap devices exist or not.  So it
   # is not a good idea to make this value too large.
   options         NSWAPDEV=5
   
   # 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
   
   # 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
   
   
   #####################################################################
   # 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
   
   
   #####################################################################
   # 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 or DEVICE_POLLING, might benefit from
   # a smaller granularity such as 1ms or less.
   # 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
   
   # The following options are used for debugging clock behavior only, and
   # should not be used for production systems.
   # 
   # CLK_CALIBRATION_LOOP will run the clock calibration loop at startup
   # until the user presses a key.
   
   options         CLK_CALIBRATION_LOOP
   
   # The following two options measure the frequency of the corresponding
   # clock relative to the RTC (onboard mc146818a).
   
   options         CLK_USE_I8254_CALIBRATION
   options         CLK_USE_TSC_CALIBRATION
   
   
   #####################################################################
   # 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.
   
   # Wiring devices down to a specific controller instance requires that you
   # declare the controller instance.  On other words, if you plan to wire a
   # device to ahc0, you need to declare the ahc0 device as well as the ahc
   # device as so:
   
   # device ahc
   # device ahc0
   
   # 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_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
   
  
  #####################################################################
  # 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             #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
  
  # Kernel side iconv library
  options         LIBICONV
  
  # 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.
  # MicroChannel (MCA) support is available for some devices.
  
  #
  # 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
  #       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          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?
  
  # 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 on vt
  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
  # ncv: NCR 53C500 based SCSI host adapters.
  # nsp: Workbit Ninja SCSI-3 based PC Card SCSI host adapters.
  # stg: TMC 18C30, 18C50 based ISA/PC Card SCSI host adapters.
  #
  # 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?
  device          ncv
  device          nsp
  device          stg0    at isa? port 0x140 irq 11
  
  #
  # Adaptec FSA RAID controllers, including integrated DELL controller,
  # the Dell PERC 2/QC and the HP NetRAID-4M
  #
  device          aac
  device          aacp    # SCSI Passthrough interface (optional, CAM required)
  
  #
  # IBM (now Adaptec) ServeRAID controllers
  device          ips
  
  #
  # 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          pst             # Promise Supertrak SX6000
  device          amr             # AMI MegaRAID
  
  #
  # Areca 11xx and 12xx series of SATA II RAID controllers.
  # CAM is required.
  #
  device          arcmsr          # Areca SATA II RAID
  
  #
  # 3ware ATA RAID
  #
  device          twe             # 3ware ATA RAID
  
  #
  # 3ware 9000 series PATA/SATA RAID controller driver and options.
  # The driver is implemented as a SIM, and so, needs the CAM infrastructure.
  #
  options         TWA_DEBUG               # 0-10; 10 prints the most messages.
  options         TWA_FLASH_FIRMWARE      # firmware image bundled when defined.
  device          twa                     # 3ware 9000 series PATA/SATA RAID
  
  #
  # 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 ata" 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
  device          atapicam        # emulate ATAPI devices as SCSI ditto via CAM
                                  # needs CAM to be present (scbus & pass)
  
  #The following 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.
  options         ATA_STATIC_ID
  
  #
  # 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: `fdc' and `fd'
  #
  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
  
  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=115200         # speed for serial console
                                          # (default 9600)
  
  # 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
  
  # 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.
  
  # 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: `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)
  # arl:  Aironet Arlan 655 wireless adapters.
  # ce: Cronyx Tau-PCI/32 sync single/dual port G.703/E1 serial adaptor
  #     with 32 HDLC subchannels (requires sppp (default), or NETGRAPH if
  #     NETGRAPH_CRONYX is configured)
  # cm: Arcnet SMC COM90c26 / SMC COM90c56
  #     (and SMC COM90c66 in '56 compatibility mode) adapters.
  # cp: Cronyx Tau-PCI sync single/dual/four port
  #     V.35/RS-232/RS-530/RS-449/X.21/G.703/E1/E3/T3/STS-1
  #     serial adaptor (requires sppp (default), or NETGRAPH if
  #     NETGRAPH_CRONYX is configured)
  # cs: IBM Etherjet and other Crystal Semi CS89x0-based adapters
  # ctau: Cronyx Tau sync dual port V.35/RS-232/RS-530/RS-449/X.21/G.703/E1
  #       serial adaptor (requires sppp (default), or NETGRAPH if
  #       NETGRAPH_CRONYX is configured)
  # cx: Cronyx Sigma multiport sync/async adapter (requires sppp (default),
  #     or NETGRAPH if NETGRAPH_CRONYX is configured)
  # 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
  # sbni: Granch SBNI12-xx adapters
  # sbsh: Granch SBNI16 SHDSL modem PCI adapters
  # sr: RISCom/N2 hdlc sync 1/2 port V.35/X.21 serial driver (requires sppp)
  # wl: Lucent Wavelan (ISA card only).
  # awi: IEEE 802.11b PRISM I cards.
  # 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.
  # ray: Raytheon Raylink 802.11 wireless NICs, OEM as Webgear Aviator 2.4GHz
  # 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 arl0 at isa? irq 9 iomem 0xd0000
  device ce
  device cm0 at isa? port 0x2e0 irq 9 iomem 0xdc000
  device cp
  device cs0 at isa? port 0x300
  device ctau0 at isa? port 0x240 irq 15 drq 7
  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 sbni0 at isa? port 0x210 irq 5 flags 0xefdead
  device sr0 at isa? port 0x300 irq 5 iomem 0xd0000
  device sn0 at isa? port 0x300 irq 10
  device awi
  device wi
  device an
  options         WLCACHE         # enables the signal-strength cache
  options         WLDEBUG         # enables verbose debugging output
  device wl0 at isa? port 0x300
  device xe
  device ray
  
  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.
  #
  # Supported cards include:
  # Creative SoundBlaster ISA PnP/non-PnP
  # Supports ESS and Avance ISA chips as well.
  # Gravis UltraSound ISA PnP/non-PnP
  # Crystal Semiconductor CS461x/428x PCI
  # Neomagic 256AV (ac97)
  # Most of the more common ISA/PnP sb/mss/ess compatible cards.
  
  # For non-pnp sound cards with no bridge drivers only:
  device          pcm0 at isa? irq 10 drq 1 flags 0x0
  #
  # For PnP/PCI sound cards
  device          pcm
  
  # The bridge drivers for sound cards.  These can be seperately configured
  # for providing services to the likes of new-midi (not in the tree yet).
  # When used with 'device pcm' they also provide pcm sound services.
  #
  # 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 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 using proprietary (non-ATAPI) interface
  # scd: Sony CD-ROM using proprietary (non-ATAPI) interface
  # 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
  # spic: Sony Programmable I/O controller (VAIO notebooks)
  # stl: Stallion EasyIO and EasyConnection 8/32 (ISA and PCI), EasyConnection 8/64 PCI
  # stli: Stallion EasyConnection 8/64 ISA/EISA, ONboard, Brumby (intelligent)
  # nmdm: nullmodem terminal driver (see nmdm(4))
  
  # 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 2.0.0, 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
  #  For the PCI cards, "device stl" will suffice.
  
  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          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          spic0   at isa? irq 0 port 0x10a0
  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
  # nullmodem terminal driver
  device          nmdm
  
  #
  # MCA devices:
  #
  # The MCA bus device is `mca'.  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 `eisa'.  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
  #
  #Enable pci resources left off by a "lazy" BIOS:
  options         PCI_ENABLE_IO_MODES
  #options        PCI_QUIET       #quiets PCI code on chipset settings
  
  # AGP GART support
  #
  device          agp
  
  
  # The `ahc' device provides support for the Adaptec 29/3940(U)(W)
  # and motherboard based AIC7870/AIC7880 adapters.
  #
  # The 'ahd' device provides support for the Adaptec 79xx Ultra320
  # SCSI adapters. Options are documented in the ahd(4) manpage:
  options         AHD_DEBUG
  options         AHD_DEBUG_OPTS=0xffffffff
  options         AHD_REG_PRETTY_PRINT
  #options        AHD_TMODE_ENABLE=0xff
  #
  # 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 `bce` device provides support for Broadcom NetXtreme II
  # (BCM5706/BCM5708) PCI/PCIe Gigabit Ethernet adapters.
  #
  # The `bfe' device provides support for Broadcom 440x fast ethernet
  # adapters.  These are commonly included on several popular motherboards
  # from Asus and on some DELL laptops.
  #
  # The `bge' device provides support for gigabit ethernet adapters
  # based on the Broadcom BCM570x familiy 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.
  #
  # 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, ISP 1240 Dual Ultra SCSI,
  # ISP 1080 and 1280 (Dual) Ultra2, ISP 12160 Ultra3 SCSI, as well as
  # the Qlogic ISP 2100 and ISP 2200 Fibre Channel Host Adapters.
  #
  # 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 `em' device provides support for the Intel Pro/1000 Family of Gigabit
  # adapters (82542, 82543, 82544, 82540).
  #
  # The `fxp' device provides support for the Intel EtherExpress Pro/100B
  # PCI Fast Ethernet adapters.
  #
  # The `gx' device provides support for the Intel Pro/1000 Gigabit Ethernet
  # PCI adapters (82542, 82543-F, 82543-T).
  #
  # The 'lge' device provides 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.
  #
  # The 'my' device provides support for the Myson MTD80X and MTD89X PCI
  # Fast Ethernet adapters.
  #
  # The 'nge' device provides 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.
  #
  # The 'pcn' device provides 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).
  #
  # 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 9432 TX, BTX and FTX cards.
  #
  # The `txp' device provides support for the 3Com 3cR990 "Typhoon"
  # 10/100 adapters.
  #
  # 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, 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
  #
  #
  # 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          ahd             # AIC79xx devices
  device          amd             # AMD 53C974 (Tekram DC-390(T))
  device          isp             # Qlogic family
  device          ispfw           # Firmware for QLogic HBAs
  device          mpt             # LSI-Logic MPT/Fusion
  device          ncr             # NCR/Symbios Logic
  device          sym             # NCR/Symbios Logic (newer chipsets)
  device          trm             # Tekram DC395U/UW/F and DC315U
  #
  # Options for ISP
  #
  #       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]
  
  
  # 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
  
  # PCI Ethernet NICs that use the common MII bus controller code.
  device          bfe             # Broadcom BCM4401 10/100.
  device          dc              # DEC/Intel 21143 and various workalikes
  device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
  device          my              # Myson Fast Ethernet (MTD80X, MTD89X)
  device          pcn             # AMD Am79C97x PCI 10/100 NICs
  device          rl              # RealTek 8129/8139
  device          sbsh            # Granch SBNI16 SHDSL modem
  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          tx              # SMC EtherPower II (83c17x ``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'')
  
  # Gigabit Ethernet NICs.
  device          bce             # Broadcom BCM5706/BCM5708 Gigabit Ethernet
  device          bge             # Broadcom BCM570x (``Tigon III'')
  device          em              # Intel Pro/1000 (82542,82543,82544,82540)
  device          gx              # Intel Pro/1000 (82542, 82543)
  device          lge             # Level 1 LXT1001 (``Mercury'')
  device          nge             # NatSemi DP83820 and DP83821
  device          sk              # SysKonnect GEnesis
  device          ti              # Alteon (``Tigon I'', ``Tigon II'')
  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 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,596,686A and VT8233 SMBus controllers
  # amdpm         AMD 756 Power Management Unit
  #
  device          smbus           # Bus support, required for smb below.
  
  device          intpm
  device          alpm
  device          ichsmb
  device          viapm
  device          amdpm
  
  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
  
  #
  # ACPI support using the Intel ACPI Component Architecture reference
  # implementation.
  #
  # ACPI_DEBUG enables the use of the debug.acpi.level and debug.acpi.layer
  # kernel environment variables to select initial debugging levels for the
  # Intel ACPICA code.  (Note that the Intel code must also have USE_DEBUGGER
  # defined when it is built).
  #
  # Note that this ACPI support is experimental and it's use may result in
  # machine hangs or kernel panics.
  #
  device          acpica
  options         ACPI_DEBUG
  
  #---------------------------------------------------------------------------
  # ISDN4BSD
  #
  # See /usr/share/examples/isdn/ROADMAP for an introduction to isdn4bsd.
  #
  # i4b passive ISDN cards support contains the following hardware drivers:
  #
  #       isic  - Siemens/Infineon ISDN ISAC/HSCX/IPAC chipset driver
  #       iwic  - Winbond W6692 PCI bus ISDN S/T interface controller
  #       ifpi  - AVM Fritz!Card PCI driver
  #       ifpi2 - AVM Fritz!Card PCI driver Version 2
  #       ihfc  - Cologne Chip HFC ISA/ISA-PnP chipset driver
  #       ifpnp - AVM Fritz!Card PnP driver 
  #       itjc  - Siemens ISAC / TJNet Tiger300/320 chipset
  #
  # i4b active ISDN cards support contains the following hardware drivers:
  #
  #       iavc  - AVM B1 PCI, AVM B1 ISA, AVM T1
  #
  # Note that the ``options'' (if given) and ``device'' lines must BOTH
  # be uncommented to enable support for a given card !
  #
  # In addition to a hardware driver (and probably an option) the mandatory
  # ISDN protocol stack devices and the mandatory support device must be 
  # enabled as well as one or more devices from the optional devices section.
  #
  #---------------------------------------------------------------------------
  # isic driver (Siemens/Infineon chipsets)
  #---------------------------------------------------------------------------
  #
  # 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
  options         USR_STI
  #device         isic0   at isa? port 0x268 irq 5 flags 7
  #
  # ITK ix1 Micro ( < V.3, non-PnP version )
  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
  options         DYNALINK 
  #device         isic
  #
  # ELSA QuickStep 1000pro ISA
  options         ELSA_QS1ISA
  #device         isic
  #
  # ITK ix1 Micro ( V.3, PnP version )
  options         ITKIX1
  #device         isic
  #
  # Siemens I-Surf 2.0
  options         SIEMENS_ISURF2
  #device         isic
  #
  # Asuscom ISDNlink 128K ISAC
  options         ASUSCOM_IPAC
  #device         isic
  #
  # Eicon Diehl DIVA 2.0 and 2.02
  options       EICON_DIVA
  #device         isic
  #
  # PCI bus Cards:
  # --------------
  #
  # ELSA MicroLink ISDN/PCI (same as ELSA QuickStep 1000pro PCI)
  options         ELSA_QS1PCI
  #device         isic
  #
  #---------------------------------------------------------------------------
  #       ifpnp driver for AVM Fritz!Card ISA PnP
  #---------------------------------------------------------------------------
  #
  # AVM Fritz!Card ISA PnP
  device ifpnp
  #
  #---------------------------------------------------------------------------
  #       ihfc driver for Cologne Chip ISA chipsets (experimental!)
  #---------------------------------------------------------------------------
  #
  # Teles 16.3c ISA PnP
  # AcerISDN P10 ISA PnP
  # TELEINT ISDN SPEED No.1
  device ihfc
  #
  #---------------------------------------------------------------------------
  #       ifpi driver for AVM Fritz!Card PCI 1.0 (2.0 unsupported!)
  #---------------------------------------------------------------------------
  #
  # AVM Fritz!Card PCI 1.0
  device  ifpi
  #
  #---------------------------------------------------------------------------
  #       ifpi2 driver for AVM Fritz!Card PCI 2.0
  #---------------------------------------------------------------------------
  #
  # AVM Fritz!Card PCI 2.0
  device  "ifpi2"
  #
  #---------------------------------------------------------------------------
  #       iwic driver for Winbond W6692 chipset
  #---------------------------------------------------------------------------
  #
  # ASUSCOM P-IN100-ST-D (and other Winbond W6692 based cards)
  device  iwic
  #
  #---------------------------------------------------------------------------
  #       itjc driver for Simens ISAC / TJNet Tiger300/320 chipset
  #---------------------------------------------------------------------------
  #
  # Traverse Technologies NETjet-S
  # Teles PCI-TJ
  device  itjc
  #
  #---------------------------------------------------------------------------
  #       iavc driver (AVM active cards, needs i4bcapi driver!)
  #---------------------------------------------------------------------------
  #
  pseudo-device   "i4bcapi"       2
  #
  # AVM B1 PCI
  device          iavc0
  #
  # AVM B1 ISA bus (PnP mode not supported!)
  #device  iavc0 at isa? port 0x150 irq 5
  #
  #
  # ISDN Protocol Stack (mandatory)
  # -------------------------------
  #
  # 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 (mandatory)
  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 - requires sppp
  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'); the 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
  
  # Parallel (8255 PPI) basic I/O (mode 0) port (e.g. Advantech PCL-724)
  device pbio0 at isa? port 0x360
  
  # 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
  
  #
  # Change the size of the kernel virtual address space.  Due to
  # constraints in loader(8) on i386, this must be a multiple of 4.
  # 256 = 1 GB of kernel address space.  Increasing this also causes
  # a reduction of the address space in user processes.  512 splits
  # the 4GB cpu address space in half (2GB user, 2GB kernel).
  #
  options         KVA_PAGES=260
  
  #
  # 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
  
  # Set the size of the buffer cache KVM reservation, in buffers.  This is
  # scaled by approximately 16384 bytes.  The system will auto-size the buffer
  # cache if this option is not specified.
  #
  options         NBUF=512
  
  # Set the size of the mbuf KVM reservation, in clusters.  This is scaled
  # by approximately 2048 bytes.  The system will auto-size the mbuf area
  # to (512 + maxusers*16) if this option is not specified.
  # maxusers is in turn computed at boot time depending on available memory
  # or set to the value specified by "options MAXUSERS=x" (x=0 means
  # autoscaling).
  # So, to take advantage of autoscaling, you have to remove both
  # NMBCLUSTERS and MAXUSERS (and NMBUFS) from your kernel config.
  #
  options         NMBCLUSTERS=1024
  
  # Set the number of mbufs available in the system. Each mbuf
  # consumes 256 bytes. The system will autosize this (to 4 times
  # the number of NMBCLUSTERS, depending on other constraints)
  # if this option is not specified.
  #
  options         NMBUFS=4096
  
  # Tune the kernel malloc area parameters.  VM_KMEM_SIZE represents the 
  # minimum, in bytes, and is typically (12*1024*1024) (12MB). 
  # VM_KMEM_SIZE_MAX represents the maximum, typically 200 megabytes.
  # VM_KMEM_SIZE_SCALE can be set to adjust the auto-tuning factor, which
  # typically defaults to 4 (kernel malloc area size is physical memory 
  # divided by the scale factor).
  #
  options         VM_KMEM_SIZE="(10*1024*1024)"
  options         VM_KMEM_SIZE_MAX="(100*1024*1024)"
  options         VM_KMEM_SIZE_SCALE="4"
  
  # Tune the buffer cache maximum KVA reservation, in bytes.  The maximum is
  # usually capped at 200 MB, effecting machines with > 1GB of ram.  Note
  # that the buffer cache only really governs write buffering and disk block
  # translations.  The VM page cache is our primary disk cache and is not
  # effected by the size of the buffer cache.
  #
  options         VM_BCACHE_SIZE_MAX="(100*1024*1024)"
  
  # Tune the swap zone KVA reservation, in bytes.  The default is typically
  # 70 MB, giving the system the ability to manage a maximum of 28GB worth
  # of swapped out data.  
  #
  options         VM_SWZONE_SIZE_MAX="(50*1024*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
  
  # 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
  
  #
  # 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).
  
  # 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 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
  
  #
  # 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
  
  # USB support
  # UHCI controller
  device          uhci
  # OHCI controller
  device          ohci
  # General USB code (mandatory for USB)
  device          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 modem support
  device          umodem
  # USB mouse
  device          ums
  # USB Rio (MP3 Player)
  device          urio
  # USB scanners
  device          uscanner
  # USB com devices
  device          ucom
  device          uplcom
  device          uvscom
  device          uvisor
  device          uftdi
  
  #
  # 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. Supports the LinkSys
  # USB200M, the D-Link DUB-E100, the Melco LUAU2-KTX, the NetGear
  # FA120, the SystemTalks SGC-X2UL, and the Sitecom LN029.
  device          axe
  #
  # 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
  
  # 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!)
  
  # dcons support (Dumb Console Device)
  device          dcons                   # dumb console driver
  device          dcons_crom              # FireWire attachment
  options         DCONS_BUF_SIZE=16384    # buffer size
  options         DCONS_POLL_HZ=100       # polling rate
  options         DCONS_FORCE_CONSOLE=0   # force to be the primary console
  options         DCONS_FORCE_GDB=1       # force to be the gdb device
  
  #####################################################################
  # crypto subsystem
  #
  # This is a port of the openbsd crypto framework.  Include this when
  # configuring IPsec and when you have a h/w crypto device to accelerate
  # user applications that link to openssl.
  #
  # Drivers are ports from openbsd with some simple enhancements that have
  # been fed back to openbsd (and hopefully will be included).
  
  pseudo-device   crypto          # core crypto support
  pseudo-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
  
  device          safe            # SafeNet 1141
  options         SAFE_DEBUG      # enable debugging support: hw.safe.debug
  options         SAFE_RNDTEST    # enable rndtest support
  
  # DRM options:
  # mgadrm:    AGP Matrox G200, G400, G450, G550
  # tdfxdrm:   3dfx Voodoo 3/4/5 and Banshee
  # r128drm:   ATI Rage 128
  # radeondrm: ATI Radeon up to 9000/9100
  # DRM_DEBUG: include debug printfs, very slow
  #
  # mga requires AGP in the kernel, and it is recommended
  # for AGP r128 and radeon cards.
  
  device          mgadrm
  device          "r128drm"
  device          radeondrm
  device          tdfxdrm
  
  options         DRM_DEBUG
  
  #
  # 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         NPX_DEBUG       # enable npx debugging (FPU/math emu)
  
  # More undocumented options for linting.
  # Note that documenting these are not considered an affront.
  
  options         AHC_DUMP_EEPROM
  options         AHC_TMODE_ENABLE
  options         CAM_DEBUG_DELAY
  options         CLUSTERDEBUG
  options         COMPAT_LINUX
  options         CPU_UPGRADE_HW_CACHE
  options         DEBUG
  options         DEBUG_LINUX
  #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         NETATALKDEBUG
  #options        OLTR_NO_BULLSEYE_MAC
  #options        OLTR_NO_HAWKEYE_MAC
  #options        OLTR_NO_TMS_MAC
  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         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         XBONEHACK
  

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