FreeBSD/Linux Kernel Cross Reference
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: releng/5.2/sys/i386/conf/NOTES 123149 2003-12-04 19:57:56Z phk $
     #
     
    #
    # 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:
    #
    # The apic device enables the use of the I/O APIC for interrupt delivery.
    # The apic device can be used in both UP and SMP kernels, but is required
    # for SMP kernels.  Thus, the apic device is not strictly an SMP option,
    # but it is a prerequisite for SMP.
    #
    # Notes:
    #
    # Be sure to disable 'cpu I386_CPU' for SMP kernels.
    #
    # By default, mixed mode is used to route IRQ0 from the AT timer via
    # the 8259A master PIC through the ExtINT pin on the first I/O APIC.
    # This can be disabled via the NO_MIXED_MODE option.  In that case,
    # IRQ0 will be routed via an intpin on the first I/O APIC.  Not all
    # motherboards hook IRQ0 up to the first I/O APIC even though their
    # MP table or MADT may claim to do so.  That is why mixed mode is
    # enabled by default.
    #
    # HTT CPUs should only be used if they are enabled in the BIOS.  For
    # the ACPI case, ACPI only correctly tells us about any HTT CPUs if
    # they are enabled.  However, most HTT systems do not list HTT CPUs
    # in the MP Table if they are enabled, thus we guess at the HTT CPUs
    # for the MP Table case.  However, we shouldn't try to guess and use
    # these CPUs if HTTT is disabled.  Thus, HTT guessing is only enabled
    # for the MP Table if the user explicitly asks for it via the
    # MPTABLE_FORCE_HTT option.  Do NOT use this option if you have HTT
    # disabled in your BIOS.
    #
    
    # Mandatory:
    device          apic                    # I/O apic
    
    # Optional:
    options         MPTABLE_FORCE_HTT       # Enable HTT CPUs with the MP Table
    options         NO_MIXED_MODE           # Disable use of mixed mode
    
    
    #####################################################################
    # 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.
   #    CPU_ELAN_XTAL sets the clock crystal frequency in Hz
   #    CPU_ELAN_PPS enables precision timestamp code.
   #
   # CPU_SOEKRIS enables support www.soekris.com hardware.
   #
   # 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         CPU_SOEKRIS
   options         CPU_ELAN_XTAL=32768000
   options         CPU_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       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
   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

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