freebsd-dev/sys/i386/conf/NOTES

#
# NOTES -- Lines that can be cut/pasted into kernel and hints configs.
#
# This file contains machine dependent kernel configuration notes.  For
# machine independent notes, look in /sys/conf/NOTES.
#
# $FreeBSD$
#

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

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


#####################################################################
# SMP OPTIONS:
#
# APIC_IO enables the use of the IO APIC for Symmetric I/O.
#
# Notes:
#
#  An SMP kernel will ONLY run on an Intel MP spec. qualified motherboard.
#
#  Be sure to disable 'cpu I386_CPU' && 'cpu I486_CPU' for SMP kernels.
#
#  Check the 'Rogue SMP hardware' section to see if additional options
#   are required by your hardware.
#

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

#
# Rogue SMP hardware:
#

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

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

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

#
# Options for CPU features.
#
# CPU_ATHLON_SSE_HACK tries to enable SSE instructions when the BIOS has
# forgotten to enable them.
#
# CPU_BLUELIGHTNING_FPU_OP_CACHE enables FPU operand cache on IBM
# BlueLightning CPU.  It works only with Cyrix FPU, and this option
# should not be used with Intel FPU.
#
# CPU_BLUELIGHTNING_3X enables triple-clock mode on IBM Blue Lightning
# CPU if CPU supports it. The default is double-clock mode on
# BlueLightning CPU box.
#
# CPU_BTB_EN enables branch target buffer on Cyrix 5x86 (NOTE 1).
#
# CPU_DIRECT_MAPPED_CACHE sets L1 cache of Cyrix 486DLC CPU in direct
# mapped mode.  Default is 2-way set associative mode.
#
# CPU_CYRIX_NO_LOCK enables weak locking for the entire address space
# of Cyrix 6x86 and 6x86MX CPUs by setting the NO_LOCK bit of CCR1.
# Otherwise, the NO_LOCK bit of CCR1 is cleared.  (NOTE 3)
#
# CPU_DISABLE_5X86_LSSER disables load store serialize (i.e. enables
# reorder).  This option should not be used if you use memory mapped
# I/O device(s).
#
# CPU_ELAN enables support for AMDs ElanSC520 CPU.
#    ELAN_XTAL sets the clock crystal frequency in Hz
#    ELAN_PPS enables precision timestamp code.
#
# CPU_ENABLE_SSE enables SSE/MMX2 instructions support.  This is default
# on I686_CPU and above.
# CPU_DISABLE_SSE explicitly prevent I686_CPU from turning on SSE.
#
# CPU_FASTER_5X86_FPU enables faster FPU exception handler.
#
# CPU_I486_ON_386 enables CPU cache on i486 based CPU upgrade products
# for i386 machines.
#
# CPU_IORT defines I/O clock delay time (NOTE 1).  Default values of
# I/O clock delay time on Cyrix 5x86 and 6x86 are 0 and 7,respectively
# (no clock delay).
#
# CPU_L2_LATENCY specifed the L2 cache latency value.  This option is used
# only when CPU_PPRO2CELERON is defined and Mendocino Celeron is detected.
# The default value is 5.
#
# CPU_LOOP_EN prevents flushing the prefetch buffer if the destination
# of a jump is already present in the prefetch buffer on Cyrix 5x86(NOTE
# 1).
#
# CPU_PPRO2CELERON enables L2 cache of Mendocino Celeron CPUs.  This option
# is useful when you use Socket 8 to Socket 370 converter, because most Pentium
# Pro BIOSs do not enable L2 cache of Mendocino Celeron CPUs.
#
# CPU_RSTK_EN enables return stack on Cyrix 5x86 (NOTE 1).
#
# CPU_SUSP_HLT enables suspend on HALT.  If this option is set, CPU
# enters suspend mode following execution of HALT instruction.
#
# CPU_UPGRADE_HW_CACHE eliminates unneeded cache flush instruction(s).
#
# CPU_WT_ALLOC enables write allocation on Cyrix 6x86/6x86MX and AMD
# K5/K6/K6-2 cpus.
#
# CYRIX_CACHE_WORKS enables CPU cache on Cyrix 486 CPUs with cache
# flush at hold state.
#
# CYRIX_CACHE_REALLY_WORKS enables (1) CPU cache on Cyrix 486 CPUs
# without cache flush at hold state, and (2) write-back CPU cache on
# Cyrix 6x86 whose revision < 2.7 (NOTE 2).
#
# NO_F00F_HACK disables the hack that prevents Pentiums (and ONLY
# Pentiums) from locking up when a LOCK CMPXCHG8B instruction is
# executed.  This option is only needed if I586_CPU is also defined,
# and should be included for any non-Pentium CPU that defines it.
#
# NO_MEMORY_HOLE is an optimisation for systems with AMD K6 processors
# which indicates that the 15-16MB range is *definitely* not being
# occupied by an ISA memory hole.
#
# CPU_DISABLE_CMPXCHG disables the CMPXCHG instruction on > i386 IA32 
# machines.  VmWare seems to emulate this instruction poorly, causing 
# the guest OS to run very slowly.  Enabling this with a SMP kernel
# will cause the kernel to be unusable.
#
# NOTE 1: The options, CPU_BTB_EN, CPU_LOOP_EN, CPU_IORT,
# CPU_LOOP_EN and CPU_RSTK_EN should not be used because of CPU bugs.
# These options may crash your system.
#
# NOTE 2: If CYRIX_CACHE_REALLY_WORKS is not set, CPU cache is enabled
# in write-through mode when revision < 2.7.  If revision of Cyrix
# 6x86 >= 2.7, CPU cache is always enabled in write-back mode.
#
# NOTE 3: This option may cause failures for software that requires
# locked cycles in order to operate correctly.
#
options 	CPU_ATHLON_SSE_HACK
options 	CPU_BLUELIGHTNING_FPU_OP_CACHE
options 	CPU_BLUELIGHTNING_3X
options 	CPU_BTB_EN
options 	CPU_DIRECT_MAPPED_CACHE
options 	CPU_DISABLE_5X86_LSSER
options 	CPU_ELAN
options 	ELAN_XTAL=32768000
options 	ELAN_PPS
options 	CPU_ENABLE_SSE
#options 	CPU_DISABLE_SSE
options 	CPU_FASTER_5X86_FPU
options 	CPU_I486_ON_386
options 	CPU_IORT
options 	CPU_L2_LATENCY=5
options 	CPU_LOOP_EN
options 	CPU_PPRO2CELERON
options 	CPU_RSTK_EN
options 	CPU_SUSP_HLT
options 	CPU_UPGRADE_HW_CACHE
options 	CPU_WT_ALLOC
options 	CYRIX_CACHE_WORKS
options 	CYRIX_CACHE_REALLY_WORKS
#options 	NO_F00F_HACK
options 	CPU_DISABLE_CMPXCHG

# Debug options
options 	NPX_DEBUG	# enable npx debugging (FPU/math emu)
					#new math emulator

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


#####################################################################
# NETWORKING OPTIONS

#
# DEVICE_POLLING adds support for mixed interrupt-polling handling
# of network device drivers, which has significant benefits in terms
# of robustness to overloads and responsivity, as well as permitting
# accurate scheduling of the CPU time between kernel network processing
# and other activities. The drawback is a moderate (up to 1/HZ seconds)
# potential increase in response times.
# It is strongly recommended to use HZ=1000 or 2000 with DEVICE_POLLING
# to achieve smoother behaviour.
# Additionally, you can enable/disable polling at runtime with the
# sysctl variable kern.polling.enable (defaults off), and select
# the CPU fraction reserved to userland with the sysctl variable
# kern.polling.user_frac (default 50, range 0..100).
#
# Only the "dc" "fxp" and "sis" devices support this mode of operation at
# the time of this writing.

options 	DEVICE_POLLING


#####################################################################
# CLOCK OPTIONS

# 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


#####################################################################
# MISCELLANEOUS DEVICES AND OPTIONS

device		speaker		#Play IBM BASIC-style noises out your speaker
hint.speaker.0.at="isa"
hint.speaker.0.port="0x61"
device		gzip		#Exec gzipped a.out's. REQUIRES COMPAT_AOUT!
device		apm_saver	# Requires APM


#####################################################################
# HARDWARE BUS CONFIGURATION

#
# ISA bus
#
device		isa

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

options 	COMPAT_OLDISA	#Use ISA shims and glue for old drivers
options 	AUTO_EOI_1
#options 	AUTO_EOI_2

options 	MAXMEM=(128*1024)
#options 	BROKEN_KEYBOARD_RESET

# 
# EISA bus
#
# The EISA bus device is `eisa'.  It provides auto-detection and
# configuration support for all devices on the EISA bus.

device		eisa

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

#
# MCA bus:
#
# The MCA bus device is `mca'.  It provides auto-detection and
# configuration support for all devices on the MCA bus.
# No hints are required for MCA.

device		mca

#
# PCI bus & PCI options:
#
device		pci

#
# AGP GART support
device		agp

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

#
# Mandatory devices:
#

# To include support for VGA VESA video modes
options 	VESA

# Turn on extra debugging checks and output for VESA support.
options 	VESA_DEBUG

# The pcvt console driver (vt220 compatible).
device		vt
hint.vt.0.at="isa"
options 	XSERVER			# support for running an X server on vt
options 	FAT_CURSOR		# start with block cursor
# This PCVT option is for keyboards such as those used on really old ThinkPads
options 	PCVT_SCANSET=2
# Other PCVT options are documented in pcvt(4).
options 	PCVT_24LINESDEF
options 	PCVT_CTRL_ALT_DEL
options 	PCVT_META_ESC
options 	PCVT_NSCREENS=9
options 	PCVT_PRETTYSCRNS
options 	PCVT_SCREENSAVER
options 	PCVT_USEKBDSEC
options 	PCVT_VT220KEYB
options 	PCVT_GREENSAVER

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

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

#
# Optional devices:
#

# 3Dfx Voodoo Graphics, Voodoo II /dev/3dfx CDEV support. This will create
# the /dev/3dfx0 device to work with glide implementations. This should get
# linked to /dev/3dfx and /dev/voodoo. Note that this is not the same as
# the tdfx DRI module from XFree86 and is completely unrelated.
#
# To enable Linuxulator support, one must also include COMPAT_LINUX in the
# config as well, or you will not have the dependencies. The other option
# is to load both as modules.

device 		tdfx			# Enable 3Dfx Voodoo support
options 	TDFX_LINUX		# Enable Linuxulator support

#
# ACPI support using the Intel ACPI Component Architecture reference
# implementation.
#
# ACPI_DEBUG enables the use of the debug.acpi.level and debug.acpi.layer
# kernel environment variables to select initial debugging levels for the
# Intel ACPICA code.  (Note that the Intel code must also have USE_DEBUGGER
# defined when it is built).
#
# ACPI_MAX_THREADS sets the number of task threads started.
#
# ACPI_NO_SEMAPHORES makes the AcpiOs*Semaphore routines a no-op.
#
# ACPICA_PEDANTIC enables strict checking of AML.  Our default is to
# relax these checks to allow code generated by the Microsoft compiler
# to still execute.
#
# Note that building ACPI into the kernel is deprecated; the module is
# normally loaded automatically by the loader.
#
device		acpi
options 	ACPI_DEBUG
options 	ACPI_MAX_THREADS=1
#!options 	ACPI_NO_SEMAPHORES
#!options 	ACPI_NO_RESET_VIDEO
#!options 	ACPICA_PEDANTIC

# DRM options:
# mgadrm:    AGP Matrox G200, G400, G450, G550
# r128drm:   ATI Rage 128
# radeondrm: ATI Radeon up to 9000/9100
# sisdrm:    SiS 300/305,540,630
# tdfxdrm:   3dfx Voodoo 3/4/5 and Banshee
# DRM_DEBUG: include debug printfs, very slow
#
# mga requires AGP in the kernel, and it is recommended
# for AGP r128 and radeon cards.

device		mgadrm
device		"r128drm"
device		radeondrm
device		sisdrm
device		tdfxdrm

options 	DRM_DEBUG

# M-systems DiskOnchip products see src/sys/contrib/dev/fla/README
device		fla
hint.fla.0.at="isa"

#
# mse: Logitech and ATI InPort bus mouse ports

device		mse
hint.mse.0.at="isa"
hint.mse.0.port="0x23c"
hint.mse.0.irq="5"

#
# Network interfaces:
#

# ar:   Arnet SYNC/570i hdlc sync 2/4 port V.35/X.21 serial driver
#       (requires sppp)
# ath:	Atheros a/b/g WiFi adapters (requires ath_hal and wlan)
# cx:   Cronyx/Sigma multiport sync/async (with Cisco or PPP framing)
# ed:   Western Digital and SMC 80xx; Novell NE1000 and NE2000; 3Com 3C503
#       HP PC Lan+, various PC Card devices (refer to etc/defauls/pccard.conf)
#       (requires miibus)
# el:   3Com 3C501 (slow!)
# ie:   AT&T StarLAN 10 and EN100; 3Com 3C507; unknown NI5210;
#       Intel EtherExpress
# le:   Digital Equipment EtherWorks 2 and EtherWorks 3 (DEPCA, DE100,
#       DE101, DE200, DE201, DE202, DE203, DE204, DE205, DE422)
# lnc:  Lance/PCnet cards (Isolan, Novell NE2100, NE32-VL, AMD Am7990 and
#       Am79C960)
# oltr: Olicom ISA token-ring adapters OC-3115, OC-3117, OC-3118 and OC-3133
#       (no hints needed).
#       Olicom PCI token-ring adapters OC-3136, OC-3137, OC-3139, OC-3140,
#       OC-3141, OC-3540, OC-3250
# rdp:  RealTek RTL 8002-based pocket ethernet adapters
# sbni:	Granch SBNI12-xx ISA and PCI adapters
# sr:   RISCom/N2 hdlc sync 1/2 port V.35/X.21 serial driver (requires sppp)
# wl:	Lucent Wavelan (ISA card only).

# Order for ISA/EISA devices is important here

device		ar
hint.ar.0.at="isa"
hint.ar.0.port="0x300"
hint.ar.0.irq="10"
hint.ar.0.maddr="0xd0000"
device		cx	1
hint.cx.0.at="isa"
hint.cx.0.port="0x240"
hint.cx.0.irq="15"
hint.cx.0.drq="7"
device		ed
#options 	ED_NO_MIIBUS		# Disable ed miibus support
hint.ed.0.at="isa"
hint.ed.0.port="0x280"
hint.ed.0.irq="5"
hint.ed.0.maddr="0xd8000"
device		el	1
hint.el.0.at="isa"
hint.el.0.port="0x300"
hint.el.0.irq="9"
device		ie			# Hints only required for Starlan
hint.ie.2.at="isa"
hint.ie.2.port="0x300"
hint.ie.2.irq="5"
hint.ie.2.maddr="0xd0000"
device		le	1
hint.le.0.at="isa"
hint.le.0.port="0x300"
hint.le.0.irq="5"
hint.le.0.maddr="0xd0000"
device		lnc
hint.lnc.0.at="isa"
hint.lnc.0.port="0x280"
hint.lnc.0.irq="10"
hint.lnc.0.drq="0"
device		rdp	1
hint.rdp.0.at="isa"
hint.rdp.0.port="0x378"
hint.rdp.0.irq="7"
hint.rdp.0.flags="2"
device		sbni
hint.sbni.0.at="isa"
hint.sbni.0.port="0x210"
hint.sbni.0.irq="0xefdead"
hint.sbni.0.flags="0"
device		sr
hint.sr.0.at="isa"
hint.sr.0.port="0x300"
hint.sr.0.irq="5"
hint.sr.0.maddr="0xd0000"
device		oltr
hint.oltr.0.at="isa"
device		wl
hint.wl.0.at="isa"
hint.wl.0.port="0x300"
options 	WLCACHE		# enables the signal-strength cache
options 	WLDEBUG		# enables verbose debugging output

device		ath
device		ath_hal		# Atheros HAL (includes binary component)
#device		wlan		# 802.11 layer

#
# ATA raid adapters
#
device		pst

# 
# SCSI host adapters:
# 
# ncv: NCR 53C500 based SCSI host adapters.
# nsp: Workbit Ninja SCSI-3 based PC Card SCSI host adapters.
# stg: TMC 18C30, 18C50 based SCSI host adapters.

device          ncv
device          nsp
device          stg
hint.stg.0.at="isa"
hint.stg.0.port="0x140"
hint.stg.0.port="11"

#
# Adaptec FSA RAID controllers, including integrated DELL controllers,
# the Dell PERC 2/QC and the HP NetRAID-4M
device		aac
device		aacp	# SCSI Passthrough interface (optional, CAM required)

#
# IBM (now Adaptec) ServeRAID controllers
device		ips

#
# SafeNet crypto driver: can be moved to the MI NOTES as soon as
# it's tested on a big-endian machine
#
device		safe		# SafeNet 1141
options		SAFE_DEBUG	# enable debugging support: hw.safe.debug
options		SAFE_RNDTEST	# enable rndtest support

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

#
# Miscellaneous hardware:
#
# wt: Wangtek and Archive QIC-02/QIC-36 tape drives
# ctx: Cortex-I frame grabber
# apm: Laptop Advanced Power Management (experimental)
# pmtimer: Timer device driver for power management events (APM or ACPI)
# spigot: The Creative Labs Video Spigot video-acquisition board
# dgb: Digiboard PC/Xi and PC/Xe series driver (ALPHA QUALITY!)
# digi: Digiboard driver
# gp:  National Instruments AT-GPIB and AT-GPIB/TNT board, PCMCIA-GPIB
# asc: GI1904-based hand scanners, e.g. the Trust Amiscan Grey
# gsc: Genius GS-4500 hand scanner.
# spic: Sony Programmable I/O controller (VAIO notebooks)
# stl: Stallion EasyIO and EasyConnection 8/32 (cd1400 based)
# stli: Stallion EasyConnection 8/64, ONboard, Brumby (intelligent)

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

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

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

# Notes on the Sony Programmable I/O controller
#  This is a temporary driver that should someday be replaced by something
#  that hooks into the ACPI layer. The device is hooked to the PIIX4's
#  General Device 10 decoder, which means you have to fiddle with PCI
#  registers to map it in, even though it is otherwise treated here as
#  an ISA device. At the moment, the driver polls, although the device
#  is capable of generating interrupts. It largely undocumented.
#  The port location in the hint is where you WANT the device to be
#  mapped. 0x10a0 seems to be traditional. At the moment the jogdial
#  is the only thing truly supported, but aparently a fair percentage
#  of the Vaio extra features are controlled by this device.

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

# Notes on the Digiboard PC/Xi and PC/Xe series driver
#               
# The NDGBPORTS option specifies the number of ports controlled by the
# dgb(4) driver.  The default value is 16 ports per device.
#
# The following flag values have special meanings in dgb:
#	0x01 - alternate layout of pins
#	0x02 - use the windowed PC/Xe in 64K mode

device		wt	1
hint.wt.0.at="isa"
hint.wt.0.port="0x300"
hint.wt.0.irq="5"
hint.wt.0.drq="1"
device		ctx
hint.ctx.0.at="isa"
hint.ctx.0.port="0x230"
hint.ctx.0.maddr="0xd0000"
device		spigot	1
hint.spigot.0.at="isa"
hint.spigot.0.port="0xad6"
hint.spigot.0.irq="15"
hint.spigot.0.maddr="0xee000"
device		apm
hint.apm.0.flags="0x20"
device		pmtimer			# Adjust system timer at wakeup time
device		gp
hint.gp.0.at="isa"
hint.gp.0.port="0x2c0"
device		gsc	1
hint.gsc.0.at="isa"
hint.gsc.0.port="0x270"
hint.gsc.0.drq="3"
device		dgb	1   
options		NDGBPORTS=17
hint.dgb.0.at="isa"
hint.dgb.0.port="0x220"
hint.dgb.0.maddr="0xfc000"
device		digi
hint.digi.0.at="isa"
hint.digi.0.port="0x104"
hint.digi.0.maddr="0xd0000"
# BIOS & FEP/OS components of device digi.
device		digi_CX
device		digi_CX_PCI
device		digi_EPCX
device		digi_EPCX_PCI
device		digi_Xe
device		digi_Xem
device		digi_Xr
device		asc	1
hint.asc.0.at="isa"
hint.asc.0.port="0x3EB"
hint.asc.0.drq="3"
hint.asc.0.irq="10"
device		spic
hint.spic.0.at="isa"
hint.spic.0.port="0x10a0"
device		stl
hint.stl.0.at="isa"
hint.stl.0.port="0x2a0"
hint.stl.0.irq="10"
device		stli
hint.stli.0.at="isa"
hint.stli.0.port="0x2a0"
hint.stli.0.maddr="0xcc000"
hint.stli.0.flags="23"
hint.stli.0.msize="0x1000"
# You are unlikely to have the hardware for loran <phk@FreeBSD.org>
device		loran
hint.loran.0.at="isa"
hint.loran.0.irq="5"
# HOT1 Xilinx 6200 card (http://www.vcc.com/)
device		xrpu

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

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

options 	POWERFAIL_NMI	# make it beep instead of panicing

#
# I2C Bus
#
# Philips i2c bus support is provided by the `iicbus' device.
#
# Supported interfaces:
# pcf	Philips PCF8584 ISA-bus controller
#
device		pcf
hint.pcf.0.at="isa"
hint.pcf.0.port="0x320"
hint.pcf.0.irq="5"

#---------------------------------------------------------------------------
# ISDN4BSD
#
# See /usr/share/examples/isdn/ROADMAP for an introduction to isdn4bsd.
#
# i4b passive ISDN cards support contains the following hardware drivers:
#
#	isic  - Siemens/Infineon ISDN ISAC/HSCX/IPAC chipset driver
#	iwic  - Winbond W6692 PCI bus ISDN S/T interface controller
#	ifpi  - AVM Fritz!Card PCI driver
#	ifpi2  - AVM Fritz!Card PCI version 2 driver
#	ihfc  - Cologne Chip HFC ISA/ISA-PnP chipset driver
#	ifpnp - AVM Fritz!Card PnP driver 
#	itjc  - Siemens ISAC / TJNet Tiger300/320 chipset
#
# i4b active ISDN cards support contains the following hardware drivers:
#
#	iavc  - AVM B1 PCI, AVM B1 ISA, AVM T1
#
# Note that the ``options'' (if given) and ``device'' lines must BOTH
# be uncommented to enable support for a given card !
#
# In addition to a hardware driver (and probably an option) the mandatory
# ISDN protocol stack devices and the mandatory support device must be 
# enabled as well as one or more devices from the optional devices section.
#
#---------------------------------------------------------------------------
#	isic driver (Siemens/Infineon chipsets)
#
device	isic
#
# ISA bus non-PnP Cards:
# ----------------------
#
# Teles S0/8 or Niccy 1008
options 	TEL_S0_8
hint.isic.0.at="isa"
hint.isic.0.maddr="0xd0000"
hint.isic.0.irq="5"
hint.isic.0.flags="1"
#
# Teles S0/16 or Creatix ISDN-S0 or Niccy 1016
options 	TEL_S0_16
hint.isic.0.at="isa"
hint.isic.0.port="0xd80"
hint.isic.0.maddr="0xd0000"
hint.isic.0.irq="5"
hint.isic.0.flags="2"
#
# Teles S0/16.3
options 	TEL_S0_16_3
hint.isic.0.at="isa"
hint.isic.0.port="0xd80"
hint.isic.0.irq="5"
hint.isic.0.flags="3"
#
# AVM A1 or AVM Fritz!Card
options 	AVM_A1
hint.isic.0.at="isa"
hint.isic.0.port="0x340"
hint.isic.0.irq="5"
hint.isic.0.flags="4"
#
# USRobotics Sportster ISDN TA intern
options 	USR_STI
hint.isic.0.at="isa"
hint.isic.0.port="0x268"
hint.isic.0.irq="5"
hint.isic.0.flags="7"
#
# ITK ix1 Micro ( < V.3, non-PnP version )
options 	ITKIX1
hint.isic.0.at="isa"
hint.isic.0.port="0x398"
hint.isic.0.irq="10"
hint.isic.0.flags="18"
#
# ELSA PCC-16
options 	ELSA_PCC16
hint.isic.0.at="isa"
hint.isic.0.port="0x360"
hint.isic.0.irq="10"
hint.isic.0.flags="20"
#
# ISA bus PnP Cards:
# ------------------
#
# Teles S0/16.3 PnP
options 	TEL_S0_16_3_P
#
# Creatix ISDN-S0 P&P
options 	CRTX_S0_P
#
# Dr. Neuhaus Niccy Go@
options 	DRN_NGO
#
# Sedlbauer Win Speed
options 	SEDLBAUER
#
# Dynalink IS64PH
options 	DYNALINK 
#
# ELSA QuickStep 1000pro ISA
options 	ELSA_QS1ISA
#
# Siemens I-Surf 2.0
options 	SIEMENS_ISURF2
#
# Asuscom ISDNlink 128K ISA
options 	ASUSCOM_IPAC
#
# Eicon Diehl DIVA 2.0 and 2.02
options 	EICON_DIVA
#
# Compaq Microcom 610 ISDN card (Compaq series PSB2222I)
options 	COMPAQ_M610
#
# PCI bus Cards:
# --------------
#
# Cyclades Cyclom-Y PCI serial driver
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"
#
#---------------------------------------------------------------------------
# ELSA MicroLink ISDN/PCI (same as ELSA QuickStep 1000pro PCI)
options 	ELSA_QS1PCI
#
#
#---------------------------------------------------------------------------
#	ifpnp driver for AVM Fritz!Card PnP
#
# AVM Fritz!Card PnP
device ifpnp
#
#---------------------------------------------------------------------------
#	ihfc driver for Cologne Chip ISA chipsets (experimental!)
#
# Teles 16.3c ISA PnP
# AcerISDN P10 ISA PnP
# TELEINT ISDN SPEED No.1
device ihfc
#
#---------------------------------------------------------------------------
#	ifpi driver for AVM Fritz!Card PCI
#
# AVM Fritz!Card PCI
device  ifpi
#
#---------------------------------------------------------------------------
#	ifpi2 driver for AVM Fritz!Card PCI version 2
#
# AVM Fritz!Card PCI version 2
device  "ifpi2"
#
#---------------------------------------------------------------------------
#	iwic driver for Winbond W6692 chipset
#
# ASUSCOM P-IN100-ST-D (and other Winbond W6692 based cards)
device  iwic
#
#---------------------------------------------------------------------------
#	itjc driver for Simens ISAC / TJNet Tiger300/320 chipset
#
# Traverse Technologies NETjet-S
# Teles PCI-TJ
device  itjc
#
#---------------------------------------------------------------------------
#	iavc driver (AVM active cards, needs i4bcapi driver!)
#
device	iavc
#
# AVM B1 ISA bus (PnP mode not supported!)
# ----------------------------------------
hint.iavc.0.at="isa"
hint.iavc.0.port="0x150"
hint.iavc.0.irq="5"
#
#---------------------------------------------------------------------------
#	ISDN Protocol Stack - mandatory for all hardware drivers
#
# Q.921 / layer 2 - i4b passive cards D channel handling
device		"i4bq921"
#
# Q.931 / layer 3 - i4b passive cards D channel handling
device		"i4bq931"
#
# layer 4 - i4b common passive and active card handling
device		"i4b"
#
#---------------------------------------------------------------------------
#	ISDN devices - mandatory for all hardware drivers
#
# userland driver to do ISDN tracing (for passive cards only)
device		"i4btrc"	4
#
# userland driver to control the whole thing
device		"i4bctl"
#
#---------------------------------------------------------------------------
#	ISDN devices - optional
#
# userland driver for access to raw B channel
device		"i4brbch"	4
#
# userland driver for telephony
device		"i4btel"	2
#
# network driver for IP over raw HDLC ISDN
device		"i4bipr"	4
# enable VJ header compression detection for ipr i/f
options 	IPR_VJ
# enable logging of the first n IP packets to isdnd (n=32 here)
options 	IPR_LOG=32
#
# network driver for sync PPP over ISDN; requires an equivalent
# number of sppp device to be configured
device		"i4bisppp"	4
#
# B-channel interface to the netgraph subsystem
device		"i4bing"	2
#
# CAPI driver needed for active ISDN cards (see iavc driver above)
device		"i4bcapi"
#
#---------------------------------------------------------------------------

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

#
# Change the size of the kernel virtual address space.  Due to
# constraints in loader(8) on i386, this must be a multiple of 4.
# 256 = 1 GB of kernel address space.  Increasing this also causes
# a reduction of the address space in user processes.  512 splits
# the 4GB cpu address space in half (2GB user, 2GB kernel).
#
options 	KVA_PAGES=260


#####################################################################
# ABI Emulation

# Enable iBCS2 runtime support for SCO and ISC binaries
options 	IBCS2

# Emulate spx device for client side of SVR3 local X interface
options 	SPX_HACK

# Enable Linux ABI emulation
options 	COMPAT_LINUX

# Enable i386 a.out binary support
options 	COMPAT_AOUT

# Enable the linux-like proc filesystem support (requires COMPAT_LINUX
# and PSEUDOFS)
options 	LINPROCFS

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


#####################################################################
# VM OPTIONS

# Disable the 4 MByte page PSE CPU feature.  The PSE feature allows the
# kernel to use a 4 MByte pages to map the kernel instead of 4k pages.
# This saves on the amount of memory needed for page tables needed to
# map the kernel.  You should only disable this feature as a temporary
# workaround if you are having problems with it enabled.
#
#options 	DISABLE_PSE

# Disable the global pages PGE CPU feature.  The PGE feature allows pages
# to be marked with the PG_G bit.  TLB entries for these pages are not
# flushed from the cache when %cr3 is reloaded.  This can make context
# switches less expensive.  You should only disable this feature as a
# temporary workaround if you are having problems with it enabled.
#
#options 	DISABLE_PG_G

# KSTACK_PAGES is the number of memory pages to assign to the kernel
# stack of each thread.

options 	KSTACK_PAGES=3

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

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

options 	FB_INSTALL_CDEV		# install a CDEV entry in /dev

# PECOFF module (Win32 Execution Format)
options 	PECOFF_SUPPORT
options 	PECOFF_DEBUG

options 	ENABLE_ALART
options 	I4B_SMP_WORKAROUND
options 	I586_PMC_GUPROF=0x70000
options 	KBDIO_DEBUG=2
options 	KBD_MAXRETRY=4
options 	KBD_MAXWAIT=6
options 	KBD_RESETDELAY=201

options 	PSM_DEBUG=1

options 	TIMER_FREQ=((14318182+6)/12)

options 	VM_KMEM_SIZE
options 	VM_KMEM_SIZE_MAX
options 	VM_KMEM_SIZE_SCALE