Mention that options BOOTP requires options NFSCLIENT and options NFS_ROOT

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

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

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

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

#
# We want LINT to cover profiling as well
profile         2

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

#
# Certain applications can grow to be larger than the 512M limit
# that FreeBSD initially imposes.  Below are some options to
# allow that limit to grow to 1GB, 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="(1024UL*1024*1024)"
options         MAXSSIZ="(128UL*1024*1024)"
options         DFLDSIZ="(1024UL*1024*1024)"

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

# Options for the VM subsystem
options         PQ_CACHESIZE=512        # color for 512k/16k cache
options         KSTACK_PAGES=3          # number of stack pages per process
# Deprecated options supported for backwards compatibility
#options        PQ_NOOPT                # No coloring
#options        PQ_LARGECACHE           # color for 512k/16k cache
#options        PQ_HUGECACHE            # color for 1024k/16k cache
#options        PQ_MEDIUMCACHE          # color for 256k/16k cache
#options        PQ_NORMALCACHE          # color for 64k/16k cache

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

options GEOM                            # Use the GEOMetry system for
                                        # disk-I/O transformations.

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

\f
#####################################################################
# SMP OPTIONS:
#
# SMP enables building of a Symmetric MultiProcessor Kernel.

# Mandatory:
options         SMP                     # Symmetric MultiProcessor Kernel

# SMP Debugging Options:
#
# MUTEX_DEBUG enables various extra assertions in the mutex code.
# WITNESS enables the mutex witness code which detects deadlocks and cycles
#         during locking operations.
# WITNESS_DDB causes the witness code to drop into the kernel debugger if
#         a lock heirarchy violation occurs or if locks are held when going to
#         sleep.
# WITNESS_SKIPSPIN disables the witness checks on spin mutexes.
options         MUTEX_DEBUG
options         WITNESS
options         WITNESS_DDB
options         WITNESS_SKIPSPIN

\f
#####################################################################
# COMPATIBILITY OPTIONS                                             

#
# Implement system calls compatible with 4.3BSD and older versions of
# FreeBSD.  You probably do NOT want to remove this as much current code
# still relies on the 4.3 emulation.
#
options         COMPAT_43

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

\f
#####################################################################
# DEBUGGING OPTIONS

#
# Enable the kernel debugger.
#
options         DDB

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

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

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

#
# KTR is a kernel tracing mechanism imported from BSD/OS.  Currently it
# has no userland interface aside from a few sysctl's.  It is enabled with
# the KTR option.  KTR_ENTRIES defines the number of entries in the circular
# trace buffer.  KTR_COMPILE defines the mask of events to compile into the
# kernel as defined by the KTR_* constants in <sys/ktr.h>.  KTR_MASK defines the
# initial value of the ktr_mask variable which determines at runtime what
# events to trace.  KTR_CPUMASK determines which CPU's log events, with
# bit X corresponding to cpu X.  KTR_VERBOSE enables dumping of KTR events
# to the console by default.  This functionality can be toggled via the
# debug.ktr_verbose sysctl and defaults to off if KTR_VERBOSE is not defined.
#
options         KTR
options         KTR_ENTRIES=1024
options         KTR_COMPILE="(KTR_INTR|KTR_PROC)"
options         KTR_MASK=KTR_INTR
options         KTR_CPUMASK=0x3
options         KTR_VERBOSE

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

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

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

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

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

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


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

#
# Protocol families:
#  Only the INET (Internet) family is officially supported in FreeBSD.
#  Source code for the NS (Xerox Network Service) is provided for amusement
#  value.
#
options         INET                    #Internet communications protocols
options         INET6                   #IPv6 communications protocols
options         IPSEC                   #IP security
options         IPSEC_ESP               #IP security (crypto; define w/ IPSEC)
options         IPSEC_DEBUG             #debug for IP security

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

#options        NCP                     #NetWare Core protocol

options         NETATALK                #Appletalk communications protocols
options         NETATALKDEBUG           #Appletalk debugging

# These are currently broken but are shipped due to interest.
#options        NS                      #Xerox NS protocols
#options        NSIP                    #XNS over IP

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

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

# netgraph(4). Enable the base netgraph code with the NETGRAPH option.
# Individual node types can be enabled with the corresponding option
# listed below; however, this is not strictly necessary as netgraph
# will automatically load the corresponding KLD module if the node type
# is not already compiled into the kernel. Each type below has a
# corresponding man page, e.g., ng_async(8).
options         NETGRAPH                #netgraph(4) system
options         NETGRAPH_ASYNC
options         NETGRAPH_BPF
options         NETGRAPH_CISCO
options         NETGRAPH_ECHO
options         NETGRAPH_ETHER
options         NETGRAPH_FRAME_RELAY
options         NETGRAPH_GIF
options         NETGRAPH_GIF_DEMUX
options         NETGRAPH_HOLE
options         NETGRAPH_IFACE
options         NETGRAPH_IP_INPUT
options         NETGRAPH_KSOCKET
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_SPLIT
options         NETGRAPH_TEE
options         NETGRAPH_TTY
options         NETGRAPH_UI
options         NETGRAPH_VJC

device          mn      # Munich32x/Falc54 Nx64kbit/sec cards.
device          lmc     # tulip based LanMedia WAN cards
device          musycc  # LMC/SBE LMC1504 quad T1/E1

#
# Network interfaces:
#  The `loop' device is MANDATORY when networking is enabled.
#  The `ether' device provides generic code to handle
#  Ethernets; it is MANDATORY when a Ethernet device driver is
#  configured or token-ring is enabled.
#  The `fddi' device provides generic code to support FDDI.
#  The `arcnet' device provides generic code to support Arcnet.
#  The `sppp' device serves a similar role for certain types
#  of synchronous PPP links (like `cx', `ar').
#  The `sl' device implements the Serial Line IP (SLIP) service.
#  The `ppp' device implements the Point-to-Point Protocol.
#  The `bpf' device enables the Berkeley Packet Filter.  Be
#  aware of the legal and administrative consequences of enabling this
#  option.  The number of devices determines the maximum number of
#  simultaneous BPF clients programs runnable.
#  The `disc' device implements a minimal network interface,
#  which throws away all packets sent and never receives any.  It is
#  included for testing purposes.  This shows up as the `ds' interface.
#  The `tap' device is a pty-like virtual Ethernet interface
#  The `tun' device implements (user-)ppp and nos-tun
#  The `gif' device implements IPv6 over IP4 tunneling,
#  IPv4 over IPv6 tunneling, IPv4 over IPv4 tunneling and
#  IPv6 over IPv6 tunneling.
#  The XBONEHACK option allows the same pair of addresses to be configured on
#  multiple gif interfaces.
#  The `faith' device captures packets sent to it and diverts them
#  to the IPv4/IPv6 translation daemon.
#  The `stf' device implements 6to4 encapsulation.
#  The `ef' device provides support for multiple ethernet frame types
#  specified via ETHER_* options. See ef(4) for details.
#
# The PPP_BSDCOMP option enables support for compress(1) style entire
# packet compression, the PPP_DEFLATE is for zlib/gzip style compression.
# PPP_FILTER enables code for filtering the ppp data stream and selecting
# events for resetting the demand dial activity timer - requires bpf.
# See pppd(8) for more details.
#
device          ether                   #Generic Ethernet
device          vlan                    #VLAN support
device          token                   #Generic TokenRing
device          fddi                    #Generic FDDI
device          arcnet                  #Generic Arcnet
device          sppp                    #Generic Synchronous PPP
device          loop    1               #Network loopback device
device          bpf                     #Berkeley packet filter
device          disc                    #Discard device (ds0, ds1, etc)
device          tap                     #Virtual Ethernet driver
device          tun                     #Tunnel driver (ppp(8), nos-tun(8))
device          sl                      #Serial Line IP
device          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)

device          ef                      # Multiple ethernet frames support
options         ETHER_II                # enable Ethernet_II frame
options         ETHER_8023              # enable Ethernet_802.3 (Novell) frame
options         ETHER_8022              # enable Ethernet_802.2 frame
options         ETHER_SNAP              # enable Ethernet_802.2/SNAP frame

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

#
# Internet family options:
#
# MROUTING enables the kernel multicast packet forwarder, which works
# with mrouted(8).
#
# 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.
#
# PFIL_HOOKS enables an abtraction layer which is meant to be used in
# network code where filtering is required.  See the pfil(9) man page.
# This option is a subset of the IPFILTER option.
#
# TCPDEBUG enables code which keeps traces of the TCP state machine
# for sockets with the SO_DEBUG option set, which can then be examined
# using the trpt(8) utility.
#
options         MROUTING                # Multicast routing
options         IPFIREWALL              #firewall
options         IPFIREWALL_VERBOSE      #enable logging to syslogd(8)
options         IPFIREWALL_FORWARD      #enable transparent proxy support
options         IPFIREWALL_VERBOSE_LIMIT=100    #limit verbosity
options         IPFIREWALL_DEFAULT_TO_ACCEPT    #allow everything by default
options         IPV6FIREWALL            #firewall for IPv6
options         IPV6FIREWALL_VERBOSE
options         IPV6FIREWALL_VERBOSE_LIMIT=100
options         IPV6FIREWALL_DEFAULT_TO_ACCEPT
options         IPDIVERT                #divert sockets
options         IPFILTER                #ipfilter support
options         IPFILTER_LOG            #ipfilter logging
options         IPFILTER_DEFAULT_BLOCK  #block all packets by default
options         IPSTEALTH               #support for stealth forwarding
options         PFIL_HOOKS
options         TCPDEBUG

# RANDOM_IP_ID causes the ID field in IP packets to be randomized
# instead of incremented by 1 with each packet generated.  This
# option closes a minor information leak which allows remote
# observers to determine the rate of packet generation on the
# machine by watching the counter.
options         RANDOM_IP_ID

# Statically Link in accept filters
options         ACCEPT_FILTER_DATA
options         ACCEPT_FILTER_HTTP

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

# DUMMYNET enables the "dummynet" bandwidth limiter. You need
# IPFIREWALL as well. See the dummynet(4) and ipfw(8) manpages for more info.
# When you run DUMMYNET it is advisable to also have "options HZ=1000"
# to achieve a smoother scheduling of the traffic.
#
# BRIDGE enables bridging between ethernet cards -- see bridge(4).
# You can use IPFIREWALL and DUMMYNET together with bridging.
#
options         DUMMYNET
options         BRIDGE

#
# ATM (HARP version) options
#
# ATM_CORE includes the base ATM functionality code.  This must be included
#       for ATM support.
#
# ATM_IP includes support for running IP over ATM.
#
# At least one (and usually only one) of the following signalling managers
# must be included (note that all signalling managers include PVC support):
# ATM_SIGPVC includes support for the PVC-only signalling manager `sigpvc'.
# ATM_SPANS includes support for the `spans' signalling manager, which runs
#       the FORE Systems's proprietary SPANS signalling protocol.
# ATM_UNI includes support for the `uni30' and `uni31' signalling managers,
#       which run the ATM Forum UNI 3.x signalling protocols.
#
# The `hea' driver provides support for the Efficient Networks, Inc.
# ENI-155p ATM PCI Adapter.
#
# The `hfa' driver provides support for the FORE Systems, Inc.
# PCA-200E ATM PCI Adapter.
#
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

\f
#####################################################################
# FILESYSTEM OPTIONS

#
# Only the root, /usr, and /tmp filesystems need be statically
# compiled; everything else will be automatically loaded at mount
# time.  (Exception: the UFS family--- FFS --- cannot
# currently be demand-loaded.)  Some people still prefer to statically
# compile other filesystems as well.
#
# NB: The NULL, PORTAL, UMAP and UNION filesystems are known to be
# buggy, and WILL panic your system if you attempt to do anything with
# them.  They are included here as an incentive for some enterprising
# soul to sit down and fix them.
#

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

# The rest are optional:
options         CD9660                  #ISO 9660 filesystem
options         FDESCFS                 #File descriptor filesystem
options         HPFS                    #OS/2 File system
options         MSDOSFS                 #MS DOS File System (FAT, FAT32)
options         NTFS                    #NT File System
options         NULLFS                  #NULL filesystem
#options        NWFS                    #NetWare filesystem
options         PORTALFS                #Portal filesystem
options         PROCFS                  #Process filesystem (requires PSEUDOFS)
options         PSEUDOFS                #Pseudo-filesystem framework
options         SMBFS                   #SMB/CIFS filesystem
options         UMAPFS                  #UID map filesystem
options         UNIONFS                 #Union filesystem
# options       NODEVFS                 #disable devices filesystem
# The xFS_ROOT options REQUIRE the associated ``options xFS''
options         NFS_ROOT                #NFS usable as root device
# This code enables IFS, an FFS which exports inodes as the namespace.
# You can find details in src/sys/ufs/ifs/README .
options         IFS

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

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

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

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

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

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

# Allow this many swap-devices.
#
# In order to manage swap, the system must reserve bitmap space that
# scales with the largest mounted swap device multiplied by NSWAPDEV, 
# irregardless of whether other swap devices exist or not.  So it
# is not a good idea to make this value too large.
options         NSWAPDEV=5

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

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

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

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

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

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

# Enable the code UFS IO optimization through the VM system.  This allows
# use VM operations instead of copying operations when possible.
# 
# Even with this enabled, actual use of the code is still controlled by the
# sysctl vfs.ioopt.  0 gives no optimization, 1 gives normal (use VM
# operations if a request happens to fit), 2 gives agressive optimization
# (the operations are split to do as much as possible through the VM system.)
#
# Enabling this will probably not give an overall speedup except for
# special workloads.
options         ENABLE_VFS_IOOPT

# Cryptographically secure random number generator; /dev/[u]random
device          random

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

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

# The granularity of operation is controlled by the kernel option HZ whose
# default value (100) means a granularity of 10ms (1s/HZ).
# Some subsystems, such as DUMMYNET, might benefit from a smaller
# granularity such as 1ms or less, for a smoother scheduling of packets.
# Consider, however, that reducing the granularity too much might
# cause excessive overhead in clock interrupt processing,
# potentially causing ticks to be missed and thus actually reducing
# the accuracy of operation.

options         HZ=100

\f
#####################################################################
# SCSI DEVICES

# SCSI DEVICE CONFIGURATION

# The SCSI subsystem consists of the `base' SCSI code, a number of
# high-level SCSI device `type' drivers, and the low-level host-adapter
# device drivers.  The host adapters are listed in the ISA and PCI
# device configuration sections below.
#
# 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:

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

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

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

# The ch driver drives SCSI Media Changer ("jukebox") devices.
#
# The da driver drives SCSI Direct Access ("disk") and Optical Media
# ("WORM") devices.
#
# The sa driver drives SCSI Sequential Access ("tape") devices.
#
# The cd driver drives SCSI Read Only Direct Access ("cd") devices.
#
# The ses driver drives SCSI Envinronment Services ("ses") and
# SAF-TE ("SCSI Accessable Fault-Tolerant Enclosure") devices.
#
# The pt driver drives SCSI Processor devices.
#
# 
# Target Mode support is provided here but also requires that a SIM
# (SCSI Host Adapter Driver) provide support as well.
#
# The targ driver provides target mode support as a Processor type device.
# It exists to give the minimal context necessary to respond to Inquiry
# commands. There is a sample user application that shows how the rest
# of the command support might be done in /usr/share/examples/scsi_target.
#
# The targbh driver provides target mode support and exists to respond
# to incoming commands that do not otherwise have a logical unit assigned
# to them.
# 
# The "unknown" device (uk? in pre-2.0.5) is now part of the base SCSI
# configuration as the "pass" driver.

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

# CAM OPTIONS:
# debugging options:
# -- NOTE --  If you specify one of the bus/target/lun options, you must
#             specify them all!
# CAMDEBUG: When defined enables debugging macros
# CAM_DEBUG_BUS:  Debug the given bus.  Use -1 to debug all busses.
# CAM_DEBUG_TARGET:  Debug the given target.  Use -1 to debug all targets.
# CAM_DEBUG_LUN:  Debug the given lun.  Use -1 to debug all luns.
# CAM_DEBUG_FLAGS:  OR together CAM_DEBUG_INFO, CAM_DEBUG_TRACE,
#                   CAM_DEBUG_SUBTRACE, and CAM_DEBUG_CDB
#
# CAM_MAX_HIGHPOWER: Maximum number of concurrent high power (start unit) cmds
# CAM_NEW_TRAN_CODE: this is the new transport layer code that will be switched
#                       to soon
# SCSI_NO_SENSE_STRINGS: When defined disables sense descriptions
# SCSI_NO_OP_STRINGS: When defined disables opcode descriptions
# SCSI_DELAY: The number of MILLISECONDS to freeze the SIM (scsi adapter)
#             queue after a bus reset, and the number of milliseconds to
#             freeze the device queue after a bus device reset.
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

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

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

device          pty             #Pseudo ttys
device          nmdm            #back-to-back tty devices
device          md              #Memory/malloc disk
device          snp             #Snoop device - to look at pty/vty/etc..
device          ccd             #Concatenated disk driver

# 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.
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

\f
#####################################################################
# HARDWARE BUS CONFIGURATION

#
# ISA bus
#
device          isa

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

options         PPS_SYNC

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

options         NTIMECOUNTER=20

#
# PCI bus & 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

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

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

#
# Mandatory devices:
#

# The syscons console driver (sco color console compatible).
device          sc      1
hint.sc.0.at="isa"
options         MAXCONS=16              # number of virtual consoles
options         SC_ALT_MOUSE_IMAGE      # simplified mouse cursor in text mode
options         SC_DFLT_FONT            # compile font in
makeoptions     SC_DFLT_FONT=cp850
options         SC_DISABLE_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)"

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

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

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

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

#
# Optional devices:
#

#
# SCSI host adapters:
#
# adw: Second Generation AdvanSys controllers including the ADV940UW.
# ahc: Adaptec 274x/284x/2910/293x/294x/394x/3950x/3960x/398X/4944/
#      19160x/29160x, aic7770/aic78xx
# amd: Support for the AMD 53C974 SCSI host adapter chip as found on devices
#      such as the Tekram DC-390(T).
# isp: Qlogic ISP 1020, 1040 and 1040B PCI SCSI host adapters,
#      ISP 1240 Dual Ultra SCSI, ISP 1080 and 1280 (Dual) Ultra2,
#      ISP 12160 Ultra3 SCSI,
#      Qlogic ISP 2100 and ISP 2200 1Gb Fibre Channel host adapters.
#      Qlogic ISP 2300 and ISP 2312 2Gb Fibre Channel host adapters.
# ispfw: Firmware module for Qlogic host adapters
# ncr: NCR 53C810, 53C825 self-contained SCSI host adapters.
# ncv: NCR 53C500 based SCSI host adapters.
# nsp: Workbit Ninja SCSI-3 based PC Card SCSI host adapters.
# sym: Symbios/Logic 53C8XX family of PCI-SCSI I/O processors:
#      53C810, 53C810A, 53C815, 53C825,  53C825A, 53C860, 53C875, 
#      53C876, 53C885,  53C895, 53C895A, 53C896,  53C897, 53C1510D, 
#      53C1010-33, 53C1010-66.

device          adw
device          ahc
device          amd
device          isp
hint.isp.0.disable="1"
hint.isp.0.role="3"
hint.isp.0.prefer_iomap="1"
hint.isp.0.prefer_memmap="1"
hint.isp.0.fwload_disable="1"
hint.isp.0.ignore_nvram="1"
hint.isp.0.fullduplex="1"
hint.isp.0.topology="lport"
hint.isp.0.topology="nport"
hint.isp.0.topology="lport-only"
hint.isp.0.topology="nport-only"
# we can't get u_int64_t types, nor can we get strings if it's got
# a leading 0x, hence this silly dodge.
hint.isp.0.portwnn="w50000000aaaa0000"
hint.isp.0.nodewnn="w50000000aaaa0001"
device          ispfw
device          ncr
device          ncv
device          nsp
device          sym

# 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

# Enable diagnostic sequencer code.
options         AHC_DEBUG_SEQUENCER

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

# Bitmap of units to enable targetmode operations.
options         AHC_TMODE_ENABLE

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

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

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

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

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

device          dpt

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

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

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

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

#
# Adaptec FSA RAID controllers, including integrated DELL controllers,
# the Dell PERC 2/QC and the HP NetRAID-4M
#
# AAC_COMPAT_LINUX      Include code to support Linux-binary management
#                       utilities (requires Linux compatibility
#                       support).
#
device          aac

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

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

#
# The 'ATA' driver supports all ATA and ATAPI devices, including PC Card
# devices. You only need one "device ata" for it to find all
# PCI and PC Card ATA/ATAPI devices on modern machines.
device          ata
device          atadisk         # ATA disk drives
device          atapicd         # ATAPI CDROM drives
device          atapifd         # ATAPI floppy drives
device          atapist         # ATAPI tape drives

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

#
# The following options are valid on the ATA driver:
#
# ATA_STATIC_ID:        controller numbering is static ie depends on location
#                       else the device numbers are dynamically allocated.

options         ATA_STATIC_ID

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

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

#
# sio: serial ports (see sio(4)), including support for various
#      PC Card devices, such as Modem and NICs (see etc/defaults/pccard.conf)

device          sio
hint.sio.0.at="isa"
hint.sio.0.port="0x3F8"
hint.sio.0.flags="0x10"
hint.sio.0.irq="4"

#
# `flags' for serial drivers that support consoles (only for sio now):
#       0x10    enable console support for this unit.  The other console flags
#               are ignored unless this is set.  Enabling console support does
#               not make the unit the preferred console - boot with -h or set
#               the 0x20 flag for that.  Currently, at most one unit can have
#               console support; the first one (in config file order) with
#               this flag set is preferred.  Setting this flag for sio0 gives
#               the old behaviour.
#       0x20    force this unit to be the console (unless there is another
#               higher priority console).  This replaces the COMCONSOLE option.
#       0x40    reserve this unit for low level console operations.  Do not
#               access the device in any normal way.
#       0x80    use this port for serial line gdb support in ddb.
#
# PnP `flags' (set via userconfig using pnp x flags y)
#       0x1     disable probing of this device.  Used to prevent your modem
#               from being attached as a PnP modem.
#

# Options for serial drivers that support consoles (only for sio now):
options         BREAK_TO_DEBUGGER       #a BREAK on a comconsole goes to
                                        #DDB, if available.
options         CONSPEED=115200         # speed for serial console
                                        # (default 9600)

# Solaris implements a new BREAK which is initiated by a character
# sequence CR ~ ^b which is similar to a familiar pattern used on
# Sun servers by the Remote Console.
options         ALT_BREAK_TO_DEBUGGER

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

# Other flags for sio that aren't documented in the man page.
#       0x20000 enable hardware RTS/CTS and larger FIFOs.  Only works for
#               ST16650A-compatible UARTs.

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

#
# Network interfaces:
#
# MII bus support is required for some PCI 10/100 ethernet NICs,
# namely those which use MII-compliant transceivers or implement
# tranceiver control interfaces that operate like an MII. Adding
# "device miibus0" to the kernel config pulls in support for
# the generic miibus API and all of the PHY drivers, including a
# generic one for PHYs that aren't specifically handled by an
# individual driver.
device          miibus

# bge:  Support for gigabit ethernet adapters based on the Broadcom
#       BCM570x family of controllers, including the 3Com 3c996-T,
#       the Netgear GA302T, the SysKonnect SK-9D21 and SK-9D41, and
#       the embedded gigE NICs on Dell PowerEdge 2550 servers.
# dc:   Support for PCI fast ethernet adapters based on the DEC/Intel 21143
#       and various workalikes including:
#       the ADMtek AL981 Comet and AN985 Centaur, the ASIX Electronics
#       AX88140A and AX88141, the Davicom DM9100 and DM9102, the Lite-On
#       82c168 and 82c169 PNIC, the Lite-On/Macronix LC82C115 PNIC II
#       and the Macronix 98713/98713A/98715/98715A/98725 PMAC. This driver
#       replaces the old al, ax, dm, pn and mx drivers.  List of brands:
#       Digital DE500-BA, Kingston KNE100TX, D-Link DFE-570TX, SOHOware SFA110, 
#       SVEC PN102-TX, CNet Pro110B, 120A, and 120B, Compex RL100-TX, 
#       LinkSys LNE100TX, LNE100TX V2.0, Jaton XpressNet, Alfa Inc GFC2204,
#       KNE110TX.
# de:   Digital Equipment DC21040
# em:   Intel Pro/1000 Gigabit Ethernet 82542, 82543, 82544 based adapters.
# fpa:  Support for the Digital DEFPA PCI FDDI. `device fddi' is also needed.
# fxp:  Intel EtherExpress Pro/100B
#       (hint of prefer_iomap can be done to prefer I/O instead of Mem mapping)
# gx:   Intel Pro/1000 Gigabit Ethernet (82542, 82543-F, 82543-T)
# lge:  Support for PCI gigabit ethernet adapters based on the Level 1
#       LXT1001 NetCellerator chipset. This includes the D-Link DGE-500SX,
#       SMC TigerCard 1000 (SMC9462SX), and some Addtron cards.
# nge:  Support for PCI gigabit ethernet adapters based on the National
#       Semiconductor DP83820 and DP83821 chipset. This includes the
#       SMC EZ Card 1000 (SMC9462TX), D-Link DGE-500T, Asante FriendlyNet
#       GigaNIX 1000TA and 1000TPC, the Addtron AEG320T, the LinkSys
#       EG1032 and EG1064, the Surecom EP-320G-TX and the Netgear GA622T.
# pcn:  Support for PCI fast ethernet adapters based on the AMD Am79c97x
#       chipsets, including the PCnet/FAST, PCnet/FAST+, PCnet/PRO and
#       PCnet/Home. These were previously handled by the lnc driver (and
#       still will be if you leave this driver out of the kernel).
# rl:   Support for PCI fast ethernet adapters based on the RealTek 8129/8139
#       chipset.  Note that the RealTek driver defaults to using programmed
#       I/O to do register accesses because memory mapped mode seems to cause
#       severe lockups on SMP hardware.  This driver also supports the
#       Accton EN1207D `Cheetah' adapter, which uses a chip called
#       the MPX 5030/5038, which is either a RealTek in disguise or a
#       RealTek workalike.  Note that the D-Link DFE-530TX+ uses the RealTek
#       chipset and is supported by this driver, not the 'vr' driver.
# sf:   Support for Adaptec Duralink PCI fast ethernet adapters based on the
#       Adaptec AIC-6915 "starfire" controller.
#       This includes dual and quad port cards, as well as one 100baseFX card.
#       Most of these are 64-bit PCI devices, except for one single port
#       card which is 32-bit.
# sis:  Support for NICs based on the Silicon Integrated Systems SiS 900,
#       SiS 7016 and NS DP83815 PCI fast ethernet controller chips.
# sk:   Support for the SysKonnect SK-984x series PCI gigabit ethernet NICs.
#       This includes the SK-9841 and SK-9842 single port cards (single mode
#       and multimode fiber) and the SK-9843 and SK-9844 dual port cards
#       (also single mode and multimode).
#       The driver will autodetect the number of ports on the card and
#       attach each one as a separate network interface.
# ste:  Sundance Technologies ST201 PCI fast ethernet controller, includes
#       the D-Link DFE-550TX.
# ti:   Support for PCI gigabit ethernet NICs based on the Alteon Networks
#       Tigon 1 and Tigon 2 chipsets.  This includes the Alteon AceNIC, the
#       3Com 3c985, the Netgear GA620 and various others.  Note that you will
#       probably want to bump up NMBCLUSTERS a lot to use this driver.
# tl:   Support for the Texas Instruments TNETE100 series 'ThunderLAN'
#       cards and integrated ethernet controllers.  This includes several
#       Compaq Netelligent 10/100 cards and the built-in ethernet controllers
#       in several Compaq Prosignia, Proliant and Deskpro systems.  It also
#       supports several Olicom 10Mbps and 10/100 boards.
# tx:   SMC 9432 TX, BTX and FTX cards. (SMC EtherPower II serie)
# txp:  Support for 3Com 3cR990 cards with the "Typhoon" chipset
# vr:   Support for various fast ethernet adapters based on the VIA
#       Technologies VT3043 `Rhine I' and VT86C100A `Rhine II' chips,
#       including the D-Link DFE530TX (see 'rl' for DFE530TX+), the Hawking 
#       Technologies PN102TX, and the AOpen/Acer ALN-320.
# vx:   3Com 3C590 and 3C595
# wb:   Support for fast ethernet adapters based on the Winbond W89C840F chip.
#       Note: this is not the same as the Winbond W89C940F, which is a
#       NE2000 clone.
# xl:   Support for the 3Com 3c900, 3c905, 3c905B and 3c905C (Fast)
#       Etherlink XL cards and integrated controllers.  This includes the
#       integrated 3c905B-TX chips in certain Dell Optiplex and Dell
#       Precision desktop machines and the integrated 3c905-TX chips
#       in Dell Latitude laptop docking stations.
#       Also supported: 3Com 3c980(C)-TX, 3Com 3cSOHO100-TX, 3Com 3c450-TX

# PCI Ethernet NICs that use the common MII bus controller code.
device          dc              # DEC/Intel 21143 and various workalikes
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
hint.fxp.0.prefer_iomap="0"
device          rl              # RealTek 8129/8139
device          pcn             # AMD Am79C97x PCI 10/100 NICs
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 (83c170 ``EPIC'')
device          vr              # VIA Rhine, Rhine II
device          wb              # Winbond W89C840F
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')

# PCI Ethernet NICs.
device          de              # DEC/Intel DC21x4x (``Tulip'')
device          txp             # 3Com 3cR990 (``Typhoon'')
device          vx              # 3Com 3c590, 3c595 (``Vortex'')

# PCI Gigabit & FDDI NICs.
device          bge
device          gx
device          lge
device          nge
device          sk
device          ti
device          fpa     1

#
# ATM related options (Cranor version)
# (note: this driver cannot be used with the HARP ATM stack)
#
# The `en' device provides support for Efficient Networks (ENI)
# ENI-155 PCI midway cards, and the Adaptec 155Mbps PCI ATM cards (ANA-59x0).
#
# atm device provides generic atm functions and is required for
# atm devices.
# NATM enables the netnatm protocol family that can be used to
# bypass TCP/IP.
#
# the current driver supports only PVC operations (no atm-arp, no multicast).
# for more details, please read the original documents at
# http://www.ccrc.wustl.edu/pub/chuck/tech/bsdatm/bsdatm.html
#
device          atm
device          en
options         NATM                    #native ATM

#
# Audio drivers: `pcm'
#
# pcm: PCM audio through various sound cards.
#
# This has support for a large number of new audio cards, based on
# CS423x, OPTi931, Yamaha OPL-SAx, and also for SB16, GusPnP.
# For more information about this driver and supported cards,
# see the pcm.4 man page.
#
# Supported cards include:
# Crystal Semiconductor CS461x/428x PCI
# Neomagic 256AV (ac97)

device          pcm

#
# midi: MIDI interfaces and synthesizers
#

device          midi

#
# seq: MIDI sequencer
#

device          seq

#
# Miscellaneous hardware:
#
# meteor: Matrox Meteor video capture board
# bktr: Brooktree bt848/848a/849a/878/879 video capture and TV Tuner board
# cy: Cyclades serial driver
# rp: Comtrol Rocketport(ISA/PCI) - single card
# nmdm: nullmodem terminal driver (see nmdm(4))

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

device          cy      1
options         CY_PCI_FASTINTR         # Use with cy_pci unless irq is shared
hint.cy.0.at="isa"
hint.cy.0.irq="10"
hint.cy.0.maddr="0xd4000"
hint.cy.0.msize="0x2000"
device          rp
# nullmodem terminal driver
device          nmdm

#
# The `meteor' device is a PCI video capture board. It can also have the
# following options:
#   options METEOR_ALLOC_PAGES=xxx      preallocate kernel pages for data entry
#       figure (ROWS*COLUMN*BYTES_PER_PIXEL*FRAME+PAGE_SIZE-1)/PAGE_SIZE
#   options METEOR_DEALLOC_PAGES        remove all allocated pages on close(2)
#   options METEOR_DEALLOC_ABOVE=xxx    remove all allocated pages above the
#       specified amount. If this value is below the allocated amount no action
#       taken
#   options METEOR_SYSTEM_DEFAULT={METEOR_PAL|METEOR_NTSC|METEOR_SECAM}, used
#       for initialization of fps routine when a signal is not present.
#
# The 'bktr' device is a PCI video capture device using the Brooktree
# bt848/bt848a/bt849a/bt878/bt879 chipset. When used with a TV Tuner it forms a
# TV card, eg Miro PC/TV, Hauppauge WinCast/TV WinTV, VideoLogic Captivator,
# Intel Smart Video III, AverMedia, IMS Turbo, FlyVideo.
#
# options       OVERRIDE_CARD=xxx
# options       OVERRIDE_TUNER=xxx
# options       OVERRIDE_MSP=1
# options       OVERRIDE_DBX=1
# These options can be used to override the auto detection
# The current values for xxx are found in src/sys/dev/bktr/bktr_card.h
# Using sysctl(8) run-time overrides on a per-card basis can be made
#
# options       BROOKTREE_SYSTEM_DEFAULT=BROOKTREE_PAL
# or
# options       BROOKTREE_SYSTEM_DEFAULT=BROOKTREE_NTSC
# Specifes the default video capture mode.
# This is required for Dual Crystal (28&35Mhz) boards where PAL is used
# to prevent hangs during initialisation.  eg VideoLogic Captivator PCI.
#
# options       BKTR_USE_PLL
# PAL or SECAM users who have a 28Mhz crystal (and no 35Mhz crystal)
# must enable PLL mode with this option. eg some new Bt878 cards.
#
# options       BKTR_GPIO_ACCESS
# This enable IOCTLs which give user level access to the GPIO port.
#
# options       BKTR_NO_MSP_RESET
# Prevents the MSP34xx reset. Good if you initialise the MSP in another OS first
#
# options       BKTR_430_FX_MODE
# Switch Bt878/879 cards into Intel 430FX chipset compatibility mode.
#
# options       BKTR_SIS_VIA_MODE
# Switch Bt878/879 cards into SIS/VIA chipset compatibility mode which is
# needed for some old SiS and VIA chipset motherboards.
# This also allows Bt878/879 chips to work on old OPTi (<1997) chipset
# motherboards and motherboards with bad or incomplete PCI 2.1 support.
# As a rough guess, old = before 1998
#

device          meteor  1

#
# options       BKTR_USE_FREEBSD_SMBUS
# Compile with FreeBSD SMBus implementation
#
# Brooktree driver has been ported to the new I2C framework. Thus,
# you'll need to have the following 3 lines in the kernel config.
#     device smbus
#     device iicbus
#     device iicbb
#     device iicsmb
# The iic and smb devices are only needed if you want to control other
# I2C slaves connected to the external connector of some cards.
#
device          bktr    1

#
# 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
#
device          smbus           # Bus support, required for smb below.

device          smb

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

device          ic
device          iic
device          iicsmb          # smb over i2c bridge

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

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

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

# Kernel BOOTP support

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

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

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

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

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

\f
#####################################################################
# USB support
# UHCI controller
device          uhci
# OHCI controller
device          ohci
# General USB code (mandatory for USB)
device          usb
#
# USB Double Bulk Pipe devices
device          udbp
# 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
# Diamond Rio 500 Mp3 player
device          urio
# USB scanners
device          uscanner
# USB serial support
device          ucom
device          uplcom
# USB serial support for DDI pocket's PHS
device          uvscom
# USB Fm Radio
device          ufm
#
# ADMtek USB ethernet. Supports the LinkSys USB100TX,
# the Billionton USB100, the Melco LU-ATX, the D-Link DSB-650TX
# and the SMC 2202USB. Also works with the ADMtek AN986 Pegasus
# eval board.
device          aue
#
# CATC USB-EL1201A USB ethernet. Supports the CATC Netmate
# and Netmate II, and the Belkin F5U111.
device          cue
#
# Kawasaki LSI ethernet. Supports the LinkSys USB10T,
# Entrega USB-NET-E45, Peracom Ethernet Adapter, the
# 3Com 3c19250, the ADS Technologies USB-10BT, the ATen UC10T,
# the Netgear EA101, the D-Link DSB-650, the SMC 2102USB
# and 2104USB, and the Corega USB-T.
device          kue

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

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

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

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

# Debug options
options         BUS_DEBUG       # enable newbus debugging
options         DEBUG_VFS_LOCKS # enable vfs lock debugging
options         NPX_DEBUG       # enable npx debugging (FPU/math emu)

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

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

# Total number of semaphores system wide
options         SEMMNS=61

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

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

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

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

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

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

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

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

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

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

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

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

options         CAM_DEBUG_DELAY

# VFS cluster debugging.
options         CLUSTERDEBUG

options         DEBUG

# Kernel filelock debugging.
options         LOCKF_DEBUG

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

options         NBUF=512        # Number of buffer headers

options         NMBCLUSTERS=1024        # Number of mbuf clusters

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

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

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

# Yet more undocumented options for linting.
options         AAC_DEBUG
options         ACD_DEBUG
options         ACPI_MAX_THREADS=1
#!options       ACPI_NO_SEMAPHORES
# Broken:
##options       ASR_MEASURE_PERFORMANCE
options         AST_DEBUG
options         ATAPI_DEBUG
options         ATA_DEBUG
# BKTR_ALLOC_PAGES has no effect except to cause warnings, and
# BROOKTREE_ALLOC_PAGES hasn't actually been superseded by it, since the
# driver still mostly spells this option BROOKTREE_ALLOC_PAGES.
##options       BKTR_ALLOC_PAGES="(217*4+1)"
options         BROOKTREE_ALLOC_PAGES="(217*4+1)"
# Broken:
##options       CAPABILITIES
options         MAXFILES=999
# METEOR_TEST_VIDEO has no effect since meteor is broken.
options         METEOR_TEST_VIDEO
options         NDEVFSINO=1025
options         NDEVFSOVERFLOW=32769
options         NETGRAPH_BRIDGE
# SIMOS is broken since it is alpha-only but not ifdefed.
##options       SIMOS