FreeBSD/Linux Kernel Cross Reference
sys/config/LINT64

     #
     # X86_64_LINT -- config file for checking all the sources, tries to pull in
     #       as much of the source tree as it can.
     #
     # $FreeBSD: src/sys/i386/conf/LINT,v 1.749.2.144 2003/06/04 17:56:59 sam Exp $
     #
     # See the kernconf(5) manual page for more information on the format of
     # this file.
     #
    # NB: You probably don't want to try running a kernel built from this
    # file.  Instead, you should start from X86_64_GENERIC, and add options
    # from this file as required.
    #
    
    # These directives are mandatory.  The machine directive specifies the
    # platform and the machine_arch directive specifies the cpu architecture.
    #
    platform        pc64
    machine         x86_64
    machine_arch    x86_64
    
    #
    # This is the ``identification'' of the kernel.  Usually this should
    # be the same as the name of your kernel.
    #
    ident           X86_64_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.
    #
    # INSTALLSTRIPPED can be set to cause installkernel to install stripped
    # kernels and modules rather than a kernel and modules with debug symbols.
    #
    # INSTALLSTRIPPEDMODULES can be set to allow a full debug kernel to be
    # installed, but to strip the installed modules.
    #
    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"
    #makeoptions    INSTALLSTRIPPED=1
    #makeoptions    INSTALLSTRIPPEDMODULES=1
    
    #
    # Certain applications can grow to be larger than the 128M limit
    # that DragonFly 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
    
    # 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\"
   
   #####################################################################
   # CPU OPTIONS
   
   cpu             HAMMER_CPU
   
   #
   # Options for CPU features.
   #
   # CPU_DISABLE_SSE disables SSE/MMX2 instructions support.
   #
   # CPU_ENABLE_EST enables support for Enhanced SpeedStep technology
   # found in Pentium(tm) M processors.
   #
   # CPU_DISABLE_AVX disables AVX instruction set.
   # 
   #options        CPU_DISABLE_SSE
   options         CPU_DISABLE_AVX
   options         CPU_ENABLE_EST
   
   #####################################################################
   # 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
   
   # Enable NDIS binary driver support
   options         NDISAPI
   device          ndis
   
   #
   # 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         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
   
   #
   # Print a stack trace on kernel panic.
   #
   options         DDB_TRACE
   
   #
   # 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 DragonFly 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 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
   
   #####################################################################
   # NETWORKING OPTIONS
   
   #
   # Protocol families:
   #  Only the INET (Internet) family is officially supported in DragonFly.
   #  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).
   # 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         MPLS                    #Multi-Protocol Label Switching
   
   #
   # 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(4).
   options         NETGRAPH                #netgraph(4) system
   options         NETGRAPH_ASYNC
   options         NETGRAPH_BPF
   options         NETGRAPH_BRIDGE
   options         NETGRAPH_CISCO
   options         NETGRAPH_ECHO
   options         NETGRAPH_EIFACE
   options         NETGRAPH_ETHER
   options         NETGRAPH_FEC
   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.
   #  The `sppp' pseudo-device serves a similar role for certain types
   #  of synchronous PPP links (like `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   bridge                  #Bridging support
   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   tap                     #Ethernet tunnel network interface
   pseudo-device   tun                     #Tunnel driver (ppp(8), nos-tun(8))
   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_DEBUG        #debug prints
   options         IPFIREWALL_VERBOSE      #enable logging to syslogd(8)
   options         IPFIREWALL_VERBOSE_LIMIT=100    #limit verbosity
   options         IPFIREWALL_DEFAULT_TO_ACCEPT    #allow everything by default
   options         IPV6FIREWALL            #firewall for IPv6
   options         IPV6FIREWALL_VERBOSE
   options         IPV6FIREWALL_VERBOSE_LIMIT=100
   options         IPV6FIREWALL_DEFAULT_TO_ACCEPT
   options         IPDIVERT                #divert sockets
   options         IPSTEALTH               #support for stealth forwarding
   options         TCPDEBUG
   
   device          pf
   device          pflog
   
   #CARP
   pseudo-device carp
   options CARP
   
   # 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
   
   # Statically link in accept filters
   options                ACCEPT_FILTER_DATA
   options                ACCEPT_FILTER_HTTP
   
   # TCP_SIGNATURE adds support for RFC 2385 (TCP-MD5) digests. These are
   # carried in TCP option 19. This option is commonly used to protect
   # TCP sessions (e.g. BGP) where IPSEC is not available nor desirable.
   # This is enabled on a per-socket basis using the TCP_SIGNATURE_ENABLE
   # socket option.
   # This requires the use of 'device crypto', 'options IPSEC'
   # or 'device cryptodev'.
   options   TCP_SIGNATURE   #include support for RFC 2385
   
   #
   # 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.
   #
   options         DUMMYNET
   options         DUMMYNET_DEBUG
   
   #
   # ATM (HARP version) options
   #
   # ATM_CORE includes the base ATM functionality code.  This must be included
   #       for ATM support.
   #
   # ATM_IP includes support for running IP over ATM.
   #
   # At least one (and usually only one) of the following signalling managers
   # must be included (note that all signalling managers include PVC support):
   # ATM_SIGPVC includes support for the PVC-only signalling manager `sigpvc'.
   # ATM_SPANS includes support for the `spans' signalling manager, which runs
   #       the FORE Systems's proprietary SPANS signalling protocol.
   # ATM_UNI includes support for the `uni30' and `uni31' signalling managers,
   #       which run the ATM Forum UNI 3.x signalling protocols.
   #
   # The `hea' driver provides support for the Efficient Networks, Inc.
   # ENI-155p ATM PCI Adapter.
   #
   # The `hfa' driver provides support for the FORE Systems, Inc.
   # PCA-200E ATM PCI Adapter.
   #
   #options        ATM_CORE                #core ATM protocol family
   #options        ATM_IP                  #IP over ATM support
   #options        ATM_SIGPVC              #SIGPVC signalling manager
   #options        ATM_SPANS               #SPANS signalling manager
   #options        ATM_UNI                 #UNI signalling manager
   #device         hea                     #Efficient ENI-155p ATM PCI
   #device         hfa                     #FORE PCA-200E ATM PCI
   
   # IFPOLL_ENABLE 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/pollhz seconds)
   # potential increase in response times. See polling(4) for further details.
   #
   # IFPOLL_ENABLE adds hardware queues' based polling
   options         IFPOLL_ENABLE
   
   #####################################################################
   # 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 PORTAL 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 filesystem
   options         NFS                     #Network filesystem
   
   # The rest are optional:
   #options        NFS_NOSERVER            #Disable the NFS-server code.
   options         CD9660                  #ISO 9660 filesystem
   options         FDESC                   #File descriptor filesystem
   options         HAMMER                  #HAMMER filesystem
   options         HPFS                    #OS/2 File system
   options         MSDOSFS                 #MS DOS filesystem
   options         NTFS                    #NT filesystem
   options         NULLFS                  #NULL filesystem
   options         NWFS                    #NetWare filesystem
   options         PORTAL                  #Portal filesystem
   options         PROCFS                  #Process filesystem
   options         PUFFS                   #Userspace file systems (e.g. ntfs-3g & sshfs)
   options         SMBFS                   #SMB/CIFS filesystem
   options         TMPFS                   #Temporary filesystem
   options         UDF                     #UDF filesystem
   
   # YYY-DR Till we rework the VOP methods for this filesystem
   #options        UNION                   #Union filesystem
   # The xFS_ROOT options REQUIRE the associated ``options xFS''
   options         FFS_ROOT                #FFS usable as root device
   options         NFS_ROOT                #NFS usable as root device
   
   # Soft updates is technique for improving UFS filesystem 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,
   # regardless 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, e.g. using SAMBA, 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
   
   # NTFS options:
   options         NTFS_DEBUG
   
   # MSDOSFS options:
   options         MSDOSFS_DEBUG           # Enable MSDOSFS Debugging
   
   #
   # 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
   
   # Optional character code conversion support with LIBICONV.
   # Each option requires their base file system and LIBICONV.
   options         CD9660_ICONV
   options         MSDOSFS_ICONV
   options         NTFS_ICONV
   
   #####################################################################
   # 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).
   # 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.
   
   # 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          sg                      #Passthrough device (linux scsi generic)
   device          pt                      #SCSI processor type
   device          ses                     #SCSI SES/SAF-TE driver
   device          targ                    #SCSI Target Mode Code
   device          targbh                  #SCSI Target Mode Blackhole Device
   
   # Options for device mapper
   device          dm
   device          dm_target_crypt
   device          dm_target_linear
   device          dm_target_striped
   
   # Options for iSCSI
   device          iscsi_initiator
   options         ISCSI_INITIATOR_DEBUG=8
   
   # CAM OPTIONS:
   # debugging options:
   # -- NOTE --  If you specify one of the bus/target/lun options, you must
   #             specify them all!
   # CAMDEBUG: When defined enables debugging macros
   # CAM_DEBUG_BUS:  Debug the given bus.  Use -1 to debug all busses.
   # CAM_DEBUG_TARGET:  Debug the given target.  Use -1 to debug all targets.
   # CAM_DEBUG_LUN:  Debug the given lun.  Use -1 to debug all luns.
   # CAM_DEBUG_FLAGS:  OR together CAM_DEBUG_INFO, CAM_DEBUG_TRACE,
   #                   CAM_DEBUG_SUBTRACE, and CAM_DEBUG_CDB
   #
   # CAM_MAX_HIGHPOWER: Maximum number of concurrent high power (start unit) cmds
   # SCSI_NO_SENSE_STRINGS: When defined disables sense descriptions
   # SCSI_NO_OP_STRINGS: When defined disables opcode descriptions
   # SCSI_DELAY: The number of MILLISECONDS to freeze the SIM (scsi adapter)
   #             queue after a bus reset, and the number of milliseconds to
   #             freeze the device queue after a bus device reset.  This
   #             can be changed at boot and runtime with the
   #             kern.cam.scsi_delay tunable/sysctl.
   options         CAMDEBUG
   options         CAM_DEBUG_BUS=-1
   options         CAM_DEBUG_TARGET=-1
   options         CAM_DEBUG_LUN=-1
   options         CAM_DEBUG_FLAGS="CAM_DEBUG_INFO|CAM_DEBUG_TRACE|CAM_DEBUG_CDB"
   options         CAM_MAX_HIGHPOWER=4
   options         SCSI_NO_SENSE_STRINGS
   options         SCSI_NO_OP_STRINGS
   options         SCSI_DELAY=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   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   putter          #for puffs and pud
   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 devices:
   
   #
   # Mandatory ISA devices: isa
   #
   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 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, DragonFly 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.
   
   options         AUTO_EOI_1
   #options        AUTO_EOI_2
   options         MAXMEM="(128*1024)"
   #options        BROKEN_KEYBOARD_RESET
   
   # 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
   
   # 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
   
   device          kbdmux                  # keyboard multiplexer
   
   # 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
   
   options         VGA_DEBUG=2             # enable VGA debug output
   
   # If you experience problems switching back to 80x25 (or a derived mode),
   # the following option might help.
   #options        VGA_KEEP_POWERON_MODE   # use power-on settings for 80x25
   
   # 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
   
   # The following option probably won't work with the LCD displays.
   options         VGA_WIDTH90             # support 90 column modes
   
   # Splash screen at start up!  Screen savers require this too.
   pseudo-device   splash
   
   # 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_DEBUG_LEVEL=5        # enable debug output
   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
   
   #
   # SCSI host adapters
   #
   # adv: All Narrow SCSI bus AdvanSys controllers.
   # adw: Second Generation AdvanSys controllers including the ADV940UW.
   # ahc: Adaptec 274x/284x/294x
   # aic: Adaptec 1460
   # 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 PC Card SCSI host adapters.
  #
  # Note that the order is important in order for Buslogic cards to be
  # probed correctly.
  #
  
  device          bt
  device          adv
  device          adw
  device          aic
  device          ncv
  device          nsp
  device          stg
  
  #
  # Adaptec FSA RAID controllers, including integrated DELL controller,
  # the Dell PERC 2/QC and the HP NetRAID-4M
  #
  device          aac
  options         AAC_DEBUG
  device          aacp    # SCSI Passthrough interface (optional, CAM required)
  
  #
  # Compaq Smart RAID, Mylex DAC960 and AMI MegaRAID controllers.  Only
  # one entry is needed; the code will find and configure all supported
  # controllers.
  #
  device          ida             # Compaq Smart RAID
  device          mlx             # Mylex DAC960
  device          amr             # AMI MegaRAID
  device          amrp            # SCSI Passthrough interface (optional, CAM req.)
  options         AMR_DEBUG=3
  device          mfi             # LSI MegaRAID SAS
  device          mfip            # LSI MegaRAID SAS passthrough, requires CAM
  options         MFI_DEBUG
  
  #
  # Areca RAID (CAM is required).
  #
  device          arcmsr          # Areca SATA II RAID
  
  #
  # Highpoint RocketRAID 182x.
  device          hptmv
  
  #
  # Highpoint RocketRAID.  Supports RR172x, RR222x, RR2240, RR232x, RR2340,
  # RR2210, RR174x, RR2522, RR231x, RR230x.
  device          hptrr
  
  #
  # Highpoint RocketRAID 27xx.
  device          "hpt27xx"
  
  #
  # Highpoint RocketRaid 3xxx series SATA RAID
  device          hptiop
  
  #
  # 3ware ATA RAID
  #
  device          twe             # 3ware ATA RAID
  device          twa             # 3ware 9000 series PATA/SATA RAID
  options         TWA_DEBUG=10    # enable debug messages
  device          tws             # 3ware 9750 series SATA/SAS RAID
  
  #
  # IBM ServeRAID
  #
  device  ips
  
  # AHCI driver, this will override NATA for AHCI devices,
  # both drivers may be included.
  #
  device          ahci
  
  # SiI3124/3132 driver
  #
  device          sili
  
  # The 'NATA' driver supports all ATA and ATAPI devices.
  # You only need one "device nata" for it to find all
  # PCI ATA/ATAPI devices on modern machines.
  #
  device          nata
  device          natadisk        # ATA disk drives
  device          natapicd        # ATAPI CD/DVD drives
  device          natapifd        # ATAPI floppy drives
  device          natapist        # ATAPI tape drives
  device          natapicam       # ATAPI CAM layer emulation
  device          nataraid        # support for ATA software RAID controllers
  device          natausb         # ATA-over-USB support
  
  # The following options are valid for the NATA 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         nata0   at isa? port IO_WD1 irq 14
  #device         nata1   at isa? port IO_WD2 irq 15
  
  #
  # 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
  
  #
  # sio: serial ports (see sio(4))
  
  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/misc/puc/pucdata.c.
  device          puc
  
  #
  # Network interfaces: `ed', `ep', `is', `lnc'
  #
  # cs: IBM Etherjet and other Crystal Semi CS89x0-based adapters
  # ed: Western Digital and SMC 80xx; Novell NE1000 and NE2000; 3Com 3C503
  # ep: 3Com 3C509
  # ex: Intel EtherExpress Pro/10 and other i82595-based adapters
  # lnc: Lance/PCnet cards (Isolan, Novell NE2100, NE32-VL, AMD Am7990 & Am79C960)
  # sbsh: Granch SBNI16 SHDSL modem PCI adapters
  # 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.
  #
  device cs
  device ed
  device ep
  device ex
  device lnc
  device sln
  device sn
  
  # Wlan support is mandatory for some wireless LAN devices.
  options         IEEE80211_DEBUG         #enable debugging msgs
  options         IEEE80211_AMPDU_AGE     #age frames in AMPDU reorder q's
  options         IEEE80211_SUPPORT_MESH  #enable 802.11s D3.0 support
  options         IEEE80211_SUPPORT_TDMA  #enable TDMA support
  device          wlan            # 802.11 support
  device          wlan_acl        # 802.11 MAC-based access control for AP
  device          wlan_ccmp       # 802.11 CCMP support
  device          wlan_tkip       # 802.11 TKIP support
  device          wlan_wep        # 802.11 WEP support
  device          wlan_xauth      # 802.11 WPA or 802.1x authentication for AP
  device          wlan_amrr       # 802.11 AMRR TX rate control algorithm
  device          an              # Aironet Communications 4500/4800
  device          ath             # Atheros AR521x
  options         AH_SUPPORT_AR5416
  device          ath_hal         # Atheros Hardware Access Layer
  #device         ath_rate_amrr   # Atheros AMRR TX rate control algorithm
  #device         ath_rate_onoe   # Atheros Onoe TX rate control algorithm
  device          ath_rate_sample # Atheros Sample TX rate control algorithm
  options         ATH_DEBUG       # turn on debugging output (see hw.ath.debug)
  options         ATH_DIAGAPI     # diagnostic interface to the HAL
  options         ATH_RXBUF=80    # number of RX buffers to allocate
  options         ATH_TXBUF=400   # number of TX buffers to allocate
  #device         iwl             # Intel PRO/Wireless 2100
  device          iwi             # Intel PRO/Wireless 2200BG/2915ABG
  device          iwn             # Intel WiFi Link 4965/1000/5000/5150/5300/6000/6050
  options         IWN_DEBUG       # turn on debugging output
  device          wi              # WaveLAN/IEEE, PRISM-II, Spectrum24 802.11DS
  #device         rtw             # RealTek 8180
  #device         acx             # TI ACX100/ACX111.
  device          xe              # Xircom PCMCIA
  device          ral             # Ralink Technology 802.11 wireless NIC
  device          wpi
  
  # IEEE 802.11 adapter firmware modules
  
  # iwifw:        Intel PRO/Wireless 2200BG/2225BG/2915ABG firmware
  # iwnfw:        Intel WiFi Link 4965/1000/5000/5150/5300/6000/6050
  # ralfw:        Ralink Technology RT25xx and RT26xx firmware
  # wpifw:        Intel 3945ABG Wireless LAN Controller firmware
  
  device          iwifw
  device          iwnfw
  device          ralfw
  device          wpifw
  
  # Bluetooth Protocols
  device          bluetooth
  
  #
  # 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
  
  # Sound drivers
  #
  
  # Basic sound card support:
  device          pcm
  # For PCI sound cards:
  device          "snd_als4000"
  device          "snd_atiixp"
  device          "snd_cmi"
  device          "snd_cs4281"
  device          "snd_csa"
  device          "snd_ds1"
  device          "snd_emu10k1"
  device          "snd_envy24"
  device          "snd_envy24ht"
  device          "snd_es137x"
  device          "snd_fm801"
  device          "snd_hda"
  device          "snd_ich"
  device          "snd_maestro"
  device          "snd_maestro3"
  device          "snd_neomagic"
  device          "snd_solo"
  device          "snd_spicds"
  device          "snd_t4dwave"
  device          "snd_via8233"
  device          "snd_via82c686"
  device          "snd_vibes"
  # USB
  device          "snd_uaudio"
  
  #
  # Miscellaneous hardware:
  #
  # bktr: Brooktree bt848/848a/849a/878/879 video capture and TV Tuner board
  # ecc: ECC memory controller
  # joy: joystick
  # nrp: Comtrol Rocketport
  # si: Specialix SI/XIO 4-32 port terminal multiplexor
  # nmdm: nullmodem terminal driver (see nmdm(4))
  # tpm: Trusted Platform Module
  
  # 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.
  
  device          ecc
  device          joy0    at isa? port IO_GAME
  device          nrp
  device          si
  # nullmodem terminal driver
  device          nmdm
  device          tpm
  
  # The `ahc' device provides support for the Adaptec 274X and 284X
  # adapters.
  device          ahc
  
  # 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
  
  #
  # PCI devices & PCI options:
  #
  # The main PCI bus device is `pci'.  It provides auto-detection and
  # configuration support for all devices on the PCI bus, using either
  # configuration mode defined in the PCI specification.
  
  device          pci
  
  # PCI options
  #
  options         COMPAT_OLDPCI   #FreeBSD 2.2 and 3.x compatibility shims
  
  # AGP GART support
  #
  device          agp
  
  #
  # AGP debugging.
  #
  options                AGP_DEBUG
  
  # The `ahc' device provides support for the Adaptec 29/3940(U)(W)
  # and motherboard based AIC7870/AIC7880 adapters.
  options         AHC_DEBUG
  options         AHC_DEBUG_OPTS=0xffffffff
  options         AHC_REG_PRETTY_PRINT
  options         AHC_TMODE_ENABLE
  #
  # 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 `bge' device provides support for gigabit ethernet adapters
  # based on the Broadcom BCM570x family of controllers, including the
  # 3Com 3c996-T, the Netgear GA302T, the SysKonnect SK-9D21 and SK-9D41,
  # and the embedded gigE NICs on Dell PowerEdge 2550 servers.
  #
  # 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 `et' device provides support for the Agere ET1310 10/100/1000 PCIe
  # adapters.
  #
  # The `fxp' device provides support for the Intel EtherExpress Pro/100B
  # PCI Fast Ethernet adapters.
  #
  # 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 'oce' device provides support for Emulex 10 Gbit adapters
  # (OneConnect Ethernet).
  #
  # 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).
  #
  # Te 're' device provides support for PCI GigaBit ethernet adapters based
  # on the RealTek 8169 chipset. It also supports the 8139C+ and is the
  # preferred driver for that chip.
  #
  # 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 `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 'bktr' device is a PCI video capture device using the Brooktree
  # bt848/bt848a/bt849a/bt878/bt879 chipset. When used with a TV Tuner it forms a
  # TV card, eg Miro PC/TV, Hauppauge WinCast/TV WinTV, VideoLogic Captivator,
  # Intel Smart Video III, AverMedia, IMS Turbo, FlyVideo.
  #
  # options       OVERRIDE_CARD=xxx
  # options       OVERRIDE_TUNER=xxx
  # options       OVERRIDE_MSP=1
  # options       OVERRIDE_DBX=1
  # These options can be used to override the auto detection
  # The current values for xxx are found in src/sys/dev/video/bktr/bktr_card.h
  # Using sysctl(8) run-time overrides on a per-card basis can be made
  #
  # options       BKTR_SYSTEM_DEFAULT=BROOKTREE_PAL
  # or
  # options       BKTR_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.  eg VideoLogic Captivator PCI.
  #
  # options       BKTR_USE_PLL
  # PAL or SECAM users who have a 28Mhz crystal (and no 35Mhz crystal)
  # must enable PLL mode with this option. eg some new Bt878 cards.
  #
  # options       BKTR_GPIO_ACCESS
  # This enable IOCTLs which give user level access to the GPIO port.
  #
  # options       BKTR_NO_MSP_RESET
  # Prevents the MSP34xx reset. Good if you initialise the MSP in another OS first
  #
  # options       BKTR_430_FX_MODE
  # Switch Bt878/879 cards into Intel 430FX chipset compatibility mode.
  #
  # options       BKTR_SIS_VIA_MODE
  # Switch Bt878/879 cards into SIS/VIA chipset compatibility mode which is
  # needed for some old SiS and VIA chipset motherboards.
  # This also allows Bt878/879 chips to work on old OPTi (<1997) chipset
  # motherboards and motherboards with bad or incomplete PCI 2.1 support.
  # As a rough guess, old = before 1998
  #
  # options       BKTR_NEW_MSP34XX_DRIVER
  # Use new, more complete initialization scheme for the msp34* soundchip.
  # Should fix stereo autodetection if the old driver does only output
  # mono sound.
  #
  # options       BKTR_OVERRIDE_CARD=xxx
  # options       BKTR_OVERRIDE_DBX=xxx
  # options       BKTR_OVERRIDE_MSP=xxx
  # options       BKTR_OVERRIDE_TUNER=xxx
  # These options can be used to select a specific device, regardless of
  # the autodetection and i2c device checks (see comments in bktr_card.c).
  #
  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 '909 FC adapters
  device          mps             # LSI-Logic MPT-Fusion 2
  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/disk/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          ae              # Attansic/Atheros L2 Fast Ethernet
  device          alc             # Atheros AR8131/AR8132
  device          ale             # Atheros AR8121/AR8113/AR8114
  device          age             # Attansic/Atheros L1 Gigabit Ethernet
  device          bce             # Broadcom NetXtreme II Gigabit Ethernet
  device          bfe             # Broadcom BCM440x 10/100 Ethernet
  device          bnx             # Broadcom NetXtreme 5718/57785 Gigabit Ethernet
  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          re              # RealTek 8139C+/8169
  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          vge             # VIA 612x GigE
  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          bge             # Broadcom BCM570x (``Tigon III'')
  device          em              # Intel Pro/1000 (8254x,8257x)
                                  # Requires ig_hal
  device          emx             # Intel Pro/1000 (8257{1,2,3,4})
                                  # Requires ig_hal
  device          igb             # Intel Pro/1000 (82575, 82576, 82580, i350)
                                  # Requires ig_hal
  device          ig_hal          # Intel Pro/1000 hardware abstraction layer
  device          ixgbe           # Intel PRO/10GbE PCIE Ethernet Family
  device          et              # Agere ET1310 10/100/1000 Ethernet
  device          lge             # Level 1 LXT1001 (``Mercury'')
  device          mxge            # Myricom Myri-10G 10GbE NIC
  device          nfe             # nVidia nForce2/3 MCP04/51/55 CK804
  device          nge             # NatSemi DP83820 and DP83821
  device          oce             # Emulex 10 GbE (OneConnect Ethernet)
  device          sk              # SysKonnect GEnesis, LinkSys EG1023, D-Link
  device          ti              # Alteon (``Tigon I'', ``Tigon II'')
  device          stge            # Sundance/Tamarack TC9021 Gigabit Ethernet
  device          msk             # Marvell/SysKonnect Yukon II Gigabit Ethernet
  device          jme             # JMicron Gigabit/Fast Ethernet
  
  # 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
  options         BKTR_NEW_MSP34XX_DRIVER
  
  # WinTV PVR-250/350 driver
  device          cxm
  
  #
  # PCCARD/PCMCIA
  #
  # pccard: pccard slots
  # cardbus/cbb: cardbus bridge
  device          pccard
  device          cardbus
  device          cbb
  
  # 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
  
  #
  # MMC/SD
  #
  # mmc           MMC/SD bus
  # mmcsd         MMC/SD memory card
  # sdhci         Generic PCI SD Host Controller
  #
  device          mmc
  device          mmcsd
  device          sdhci
  
  #
  # SMB bus
  #
  # System Management Bus support is provided by the 'smbus' device.
  # Access to the SMBus device is via the 'smb' device (/dev/smb*),
  # which is a child of the 'smbus' device.
  #
  # Supported devices:
  # smb           standard 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
  # amdsmb        AMD 8111 SMBus 2.0 Controller
  #
  device          smbus           # Bus support, required for smb below.
  
  device          intpm
  device          alpm
  device          ichsmb
  device          viapm
  device          amdpm
  device          amdsmb
  
  device          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
  
  # Intel Core and newer CPUs on-die digital thermal sensor support
  device          coretemp
  
  # AMD Family 0Fh, 10h and 11h temperature sensors
  device          kate
  device          km
  
  # ThinkPad Active Protection System accelerometer
  device          aps0    at isa? port 0x1600
  
  # HW monitoring devices lm(4), it(4) and nsclpcsio.
  device          lm0     at isa? port 0x290
  device          it0     at isa? port 0x290
  device          it1     at isa? port 0xc00
  device          it2     at isa? port 0xd00
  device          it3     at isa? port 0x228
  device          nsclpcsio0 at isa? port 0x2e
  device          nsclpcsio1 at isa? port 0x4e
  device          wbsio0  at isa? port 0x2e
  device          wbsio1  at isa? port 0x4e
  device          lm#3    at wbsio?
  device          uguru0  at isa? port 0xe0       # ABIT uGuru
  
  # 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=2     # Parallel chipset level debug
  options         PLIP_DEBUG      # Parallel network IP interface debug
  options         PCFCLOCK_VERBOSE         # Verbose pcfclock driver
  options         PCFCLOCK_MAX_RETRIES=5   # Maximum read tries (default 10)
  
  device          ppc0    at isa? irq 7
  device          ppbus
  device          vpo
  device          lpt
  device          plip
  device          ppi
  device          pps
  device          lpbb
  device          pcfclock
  
  # Kernel BOOTP support
  
  options         BOOTP           # Use BOOTP to obtain IP address/hostname
  options         BOOTP_NFSROOT   # NFS mount root filesystem using BOOTP info
  options         BOOTP_NFSV3     # Use NFS v3 to NFS mount root
  options         BOOTP_COMPAT    # Workaround for broken bootp daemons.
  options         BOOTP_WIRED_TO=fxp0 # Use interface fxp0 for BOOTP
  
  #
  # Set the number of PV entries per process.  Increasing this can
  # stop panics related to heavy use of shared memory. However, that can
  # (combined with large amounts of physical memory) cause panics at
  # boot time due the kernel running out of VM space.
  #
  # If you're tweaking this, you might also want to increase the sysctls
  # "vm.v_free_min", "vm.v_free_reserved", and "vm.v_free_target".
  #
  # The value below is the one more than the default.
  #
  options         PMAP_SHPGPERPROC=201
  
  #
  # Disable swapping. This option removes all code which actually performs
  # swapping, so it's not possible to turn it back on at run-time.
  #
  # This is sometimes usable for systems which don't have any swap space
  # (see also sysctls "vm.defer_swapspace_pageouts" and
  # "vm.disable_swapspace_pageouts")
  #
  #options        NO_SWAPPING
  
  # Set the 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 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.
  #
  # DEBUG_LOCKS_LATENCY adds a sysctl to add a forced latency loop
  # (count to N) in front of any spinlock or gettoken.
  #
  options         DEBUG_LOCKS
  options         DEBUG_LOCKS_LATENCY
  
  # 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
  
  # 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/raid/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/raid/dpt/dpt.h
  #  DPT_LOST_IRQ             When enabled, will try, once per second, to catch
  #                           any interrupt that got lost.  Seems to help in some
  #                           DPT-firmware/Motherboard combinations.  Minimal
  #                           cost, great benefit.
  #  DPT_RESET_HBA            Make "reset" actually reset the controller
  #                           instead of fudging it.  Only enable this if you
  #                           are 100% certain you need it.
  
  device          dpt
  
  # DPT options
  #!CAM# options  DPT_MEASURE_PERFORMANCE
  #!CAM# options  DPT_HANDLE_TIMEOUTS
  options         DPT_TIMEOUT_FACTOR=4
  options         DPT_LOST_IRQ
  options         DPT_RESET_HBA
  
  #
  # Compaq "CISS" RAID controllers (SmartRAID 5* series)
  # These controllers have a SCSI-like interface, and require the
  # CAM infrastructure.
  #
  device          ciss
  
  #
  # Intel Integrated RAID controllers.
  # This driver is supported and maintained by
  # "Leubner, Achim" <Achim_Leubner@adaptec.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
  # EHCI controller
  device          ehci
  # General USB code (mandatory for USB)
  device          usb
  # Use this instead of usb for the new stack
  #device         "usb4bsd"
  #
  # USB Bluetooth
  device          ubt
  # 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          moscom
  device          uark
  device          ubsa
  device          uchcom
  device          ucom
  device          uftdi
  device          ugensa
  device          umct
  device          uplcom
  device          uslcom
  device          uticom
  device          uvisor
  device          uvscom
  
  #
  # ADMtek USB ethernet. Supports the LinkSys USB100TX,
  # the Billionton USB100, the Melco LU-ATX, the D-Link DSB-650TX
  # and the SMC 2202USB. Also works with the ADMtek AN986 Pegasus
  # eval board.
  device          aue
  #
  # ASIX Electronics AX88172 USB 2.0 ethernet driver. Used in the
  # LinkSys USB200M and various other adapters.
  device          axe
  #
  # 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
  #
  # USB CDC ethernet. Supports the LG P-500 smartphone.
  device          lgue
  #
  # RealTek 8150 based USB ethernet device:
  #   Melco LUA-KTX
  #   GREEN HOUSE GH-USB100B
  #   Billionton ThumbLAN USBKR2-100B
  device          rue
  
  # USB wireless NICs, requires wlan_amrr
  #
  # Ralink Technology RT2501USB/RT2601USB
  device          rum
  #
  # Ralink Technology RT2700U/RT2800U/RT3000U wireless driver
  device          run
  device          runfw
  #
  # Ralink Technology RT2500USB
  #device         ural
  #
  # Realtek RTL8188CU/RTL8192CU wireless driver
  device          urtwn
  device          urtwnfw
  
  # 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
  
  # Firewire support
  device          firewire        # Firewire bus code
  device          sbp             # SCSI over Firewire (Requires scbus and da)
  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=1   # 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_NO_RNG     # for devices without RNG
  options         HIFN_RNDTEST    # enable rndtest support
  
  device          safe            # SafeNet 1141
  options         SAFE_DEBUG      # enable debugging support: hw.safe.debug
  #options        SAFE_NO_RNG     # for devices without RNG
  options         SAFE_RNDTEST    # enable rndtest support
  
  device          ubsec           # Broadcom 5501, 5601, 58xx
  options         UBSEC_DEBUG     # enable debugging support: hw.ubsec.debug
  #options        UBSEC_NO_RNG    # for devices without RNG
  options         UBSEC_RNDTEST   # enable rndtest support
  
  device          aesni           # hardware crypto/RNG for AES-NI
  device          padlock         # hardware crypto/RNG for VIA C3/C7/Eden
  device          rdrand          # hardware RNG for RdRand
  
  #
  # 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 building ACPI into the kernel is deprecated; the module is
  # normally loaded automatically by the loader.
  
  device          acpi
  options         ACPI_DEBUG
  
  # ACPI WMI Mapping driver
  device          acpi_wmi
  
  # ACPI Asus Extras (LCD backlight/brightness, video output, etc.)
  device          acpi_asus
  
  # ACPI Fujitsu Extras (Buttons)
  device          acpi_fujitsu
  
  # ACPI extras driver for HP laptops
  device          acpi_hp
  
  # ACPI Panasonic Extras (LCD backlight/brightness, video output, etc.)
  device          acpi_panasonic
  
  # ACPI Sony extra (LCD brightness)
  device          acpi_sony
  
  # ACPI extras driver for ThinkPad laptops
  device          acpi_thinkpad
  
  # ACPI Toshiba Extras (LCD backlight/brightness, video output, etc.)
  device          acpi_toshiba
  
  # ACPI Video Extensions (LCD backlight/brightness, video output, etc.)
  device          acpi_video
  
  device          aibs            # ASUSTeK AI Booster (ACPI ASOC ATK0110)
  
  # DRM options:
  # drm:          General DRM code
  # i915kmsdrm:   Intel integrated GPUs, starting from the 830M family
  # mach64drm:    ATI Mach64 cards - Rage and 3D Rage series
  # mgadrm:       AGP Matrox G200, G400, G450, G550
  # r128drm:      ATI Rage 128 cards
  # radeonkmsdrm: ATI Radeon cards
  # savagedrm:    Savage cards
  # sisdrm:       Sis cards
  # tdfxdrm:      3dfx Voodoo 3/4/5 and Banshee
  #
  # DRM_DEBUG:    include debug printfs, very slow
  #
  # DRM requires AGP in the kernel.
  
  device          drm
  #device         "i915kmsdrm"    # breaks VGA console, disabled by default
  device          "mach64drm"
  device          mgadrm
  device          "r128drm"
  #device         radeonkmsdrm    # breaks VGA console, disabled by default
  device          savagedrm
  device          sisdrm
  device          tdfxdrm
  
  options         DRM_DEBUG
  options         DRM_LINUX
  
  #
  # Misc devices
  #
  device          cmx             # Omnikey CardMan 4040 smartcard reader
  device          amdsbwd         # AMD South Bridge watchdog
  device          gpio            # Enable support for the gpio framework
  device          ichwd           # Intel ICH watchdog interrupt timer
  device          tbridge         # regression testing
  
  #
  # Virtio support
  #
  device          virtio
  device          virtio_blk
  device          virtio_pci
  
  #
  # Embedded system options:
  #
  # An embedded system might want to run something other than init.
  options         INIT_PATH="/sbin/init:/sbin/oinit"
  
  # Debug options
  options         BUS_DEBUG       # enable newbus debugging
  options         RSS_DEBUG       # enable RSS (Receive Side Scaling) debugging
  
  # Record the program counter of the code interrupted by the statistics
  # clock interrupt.  Use pctrack(8) to dump this information.
  options         DEBUG_PCTRACK
  
  # More undocumented options for linting.
  # Note that documenting these are not considered an affront.
  
  #options        ACPI_NO_SEMAPHORES
  options         AHC_DUMP_EEPROM
  #options        BKTR_ALLOC_PAGES=xxx
  options         CAM_DEBUG_DELAY
  options         CLUSTERDEBUG
  #options        COMPAT_LINUX
  options         DEBUG
  options         DEBUG_CRIT_SECTIONS
  options         DEBUG_INTERRUPTS
  #options        DISABLE_PSE
  options         BCE_RSS_DEBUG
  options         BCE_TSS_DEBUG
  options         BNX_RSS_DEBUG
  options         BNX_TSO_DEBUG
  options         BNX_TSS_DEBUG
  options         EMX_RSS_DEBUG
  options         EMX_TSO_DEBUG
  options         EMX_TSS_DEBUG
  options         JME_RSS_DEBUG
  options         IGB_RSS_DEBUG
  options         IGB_TSS_DEBUG
  options         IGB_MSIX_DEBUG
  #options        ED_NO_MIIBUS
  options         ENABLE_ALART
  options         FB_DEBUG=2
  options         FB_INSTALL_CDEV
  options         I586_PMC_GUPROF=0x70000
  #options        IEEE80211_DEBUG_REFCNT
  options         IEEE80211_SUPPORT_SUPERG
  options         KBDIO_DEBUG=10
  options         KBD_MAXRETRY=4
  options         KBD_MAXWAIT=6
  options         KBD_RESETDELAY=201
  #options        KERN_TIMESTAMP
  options         KEY
  #options        LINPROCFS
  options         LOCKF_DEBUG
  #options        MAXFILES=xxx
  options         MBUF_DEBUG
  options         NO_LWKT_SPLIT_USERPRI
  options         PANIC_DEBUG
  options         PMAP_DEBUG
  options         PSM_DEBUG=4
  options         SCSI_NCR_DEBUG
  options         SCSI_NCR_MAX_SYNC=10000
  options         SCSI_NCR_MAX_WIDE=1
  options         SCSI_NCR_MYADDR=7
  options         SHOW_BUSYBUFS   # List buffers that prevent root unmount
  options         SI_DEBUG
  options         SLAB_DEBUG
  options         SLIP_IFF_OPTS
  options         SOCKBUF_DEBUG
  options         TDMA_BINTVAL_DEFAULT=5
  options         TDMA_SLOTCNT_DEFAULT=2
  options         TDMA_SLOTLEN_DEFAULT=10*1000
  options         TDMA_TXRATE_11A_DEFAULT=2*24
  options         TDMA_TXRATE_11B_DEFAULT=2*11
  options         TDMA_TXRATE_11G_DEFAULT=2*24
  options         TDMA_TXRATE_11NA_DEFAULT="(4|IEEE80211_RATE_MCS)"
  options         TDMA_TXRATE_11NG_DEFAULT="(4|IEEE80211_RATE_MCS)"
  options         TDMA_TXRATE_HALF_DEFAULT=2*12
  options         TDMA_TXRATE_QUARTER_DEFAULT=2*6
  options         TDMA_TXRATE_TURBO_DEFAULT=2*24
  #options        TIMER_FREQ="((14318182+6)/12)"
  options         VFS_BIO_DEBUG
  options         VM_PAGE_DEBUG
  options         XBONEHACK
  
  options KTR
  options KTR_ALL
  options KTR_ENTRIES=1024
  options KTR_VERBOSE=1
  #options KTR_CTXSW
  #options KTR_DMCRYPT
  #options KTR_DSCHED_BFQ
  #options KTR_ETHERNET
  #options KTR_HAMMER
  #options KTR_IFQ
  #options KTR_IF_BGE
  #options KTR_IF_EM
  #options KTR_IF_EMX
  #options KTR_IF_POLL
  #options KTR_IF_START
  #options KTR_IPIQ
  #options KTR_KERNENTRY
  #options KTR_MEMORY
  #options KTR_SERIALIZER
  #options KTR_SPIN_CONTENTION
  #options KTR_TESTLOG
  #options KTR_TOKENS
  #options KTR_TSLEEP
  #options KTR_USB_MEMORY
  #options KTR_USCHED_BSD4
  #options KTR_USCHED_DFLY
  
  # ALTQ
  options         ALTQ            #alternate queueing
  options         ALTQ_CBQ        #class based queueing
  options         ALTQ_RED        #random early detection
  options         ALTQ_RIO        #triple red for diffserv (needs RED)
  options         ALTQ_HFSC       #hierarchical fair service curve
  options         ALTQ_PRIQ       #priority queue
  options         ALTQ_FAIRQ      #fair queue
  #options        ALTQ_NOPCC      #don't use processor cycle counter
  options         ALTQ_DEBUG      #for debugging
  # you might want to set kernel timer to 1kHz if you use CBQ,
  # especially with 100baseT
  #options        HZ=1000
  
  # SCTP
  options         SCTP
  options         SCTP_DEBUG
  options         SCTP_USE_ADLER32
  options         SCTP_HIGH_SPEED
  options         SCTP_STAT_LOGGING
  options         SCTP_CWND_LOGGING
  options         SCTP_BLK_LOGGING
  options         SCTP_STR_LOGGING
  options         SCTP_FR_LOGGING
  options         SCTP_MAP_LOGGING
  
  # DSCHED stuff
  options         DSCHED_AS
  options         DSCHED_BFQ
  options         DSCHED_FQ
  
  # WATCHDOG
  options         WDOG_DISABLE_ON_PANIC   # Automatically disable watchdogs on panic
  
  # LED
  options         ERROR_LED_ON_PANIC      # If an error led is present, light it up on panic

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