2 # NOTES -- Lines that can be cut/pasted into kernel and hints configs.
4 # This file contains machine dependent kernel configuration notes. For
5 # machine independent notes, look in /sys/conf/NOTES.
11 # We want LINT to cover profiling as well.
15 #####################################################################
18 # The apic device enables the use of the I/O APIC for interrupt delivery.
19 # The apic device can be used in both UP and SMP kernels, but is required
20 # for SMP kernels. Thus, the apic device is not strictly an SMP option,
21 # but it is a prerequisite for SMP.
25 # HTT CPUs should only be used if they are enabled in the BIOS. For
26 # the ACPI case, ACPI only correctly tells us about any HTT CPUs if
27 # they are enabled. However, most HTT systems do not list HTT CPUs
28 # in the MP Table if they are enabled, thus we guess at the HTT CPUs
29 # for the MP Table case. However, we shouldn't try to guess and use
30 # these CPUs if HTT is disabled. Thus, HTT guessing is only enabled
31 # for the MP Table if the user explicitly asks for it via the
32 # MPTABLE_FORCE_HTT option. Do NOT use this option if you have HTT
33 # disabled in your BIOS.
35 # IPI_PREEMPTION instructs the kernel to preempt threads running on other
36 # CPUS if needed. Relies on the PREEMPTION option
39 device apic # I/O apic
42 options MPTABLE_FORCE_HTT # Enable HTT CPUs with the MP Table
43 options IPI_PREEMPTION
52 options STOP_NMI # Stop CPUS using NMI instead of IPI
53 options COUNT_XINVLTLB_HITS # Counters for TLB events
54 options COUNT_IPIS # Per-CPU IPI interrupt counters
58 #####################################################################
62 # You must specify at least one CPU (the one you intend to run on);
63 # deleting the specification for CPUs you don't need to use may make
64 # parts of the system run faster.
67 cpu I586_CPU # aka Pentium(tm)
68 cpu I686_CPU # aka Pentium Pro(tm)
71 # Options for CPU features.
73 # CPU_ATHLON_SSE_HACK tries to enable SSE instructions when the BIOS has
74 # forgotten to enable them.
76 # CPU_BLUELIGHTNING_3X enables triple-clock mode on IBM Blue Lightning
77 # CPU if CPU supports it. The default is double-clock mode on
78 # BlueLightning CPU box.
80 # CPU_BLUELIGHTNING_FPU_OP_CACHE enables FPU operand cache on IBM
81 # BlueLightning CPU. It works only with Cyrix FPU, and this option
82 # should not be used with Intel FPU.
84 # CPU_BTB_EN enables branch target buffer on Cyrix 5x86 (NOTE 1).
86 # CPU_CYRIX_NO_LOCK enables weak locking for the entire address space
87 # of Cyrix 6x86 and 6x86MX CPUs by setting the NO_LOCK bit of CCR1.
88 # Otherwise, the NO_LOCK bit of CCR1 is cleared. (NOTE 3)
90 # CPU_DIRECT_MAPPED_CACHE sets L1 cache of Cyrix 486DLC CPU in direct
91 # mapped mode. Default is 2-way set associative mode.
93 # CPU_DISABLE_5X86_LSSER disables load store serialize (i.e., enables
94 # reorder). This option should not be used if you use memory mapped
97 # CPU_DISABLE_CMPXCHG disables the CMPXCHG instruction on > i386 IA32
98 # machines. VmWare 3.x seems to emulate this instruction poorly, causing
99 # the guest OS to run very slowly. This problem appears to be fixed in
100 # VmWare 4.x, at least in version 4.5.2, so that enabling this option with
101 # VmWare 4.x will result in locking operations to be 20-30 times slower.
102 # Enabling this with an SMP kernel will cause the kernel to be unusable.
104 # CPU_DISABLE_SSE explicitly prevents I686_CPU from turning on SSE.
106 # CPU_ELAN enables support for AMDs ElanSC520 CPU.
107 # CPU_ELAN_PPS enables precision timestamp code.
108 # CPU_ELAN_XTAL sets the clock crystal frequency in Hz.
110 # CPU_ENABLE_LONGRUN enables support for Transmeta Crusoe LongRun
111 # technology which allows to restrict power consumption of the CPU by
112 # using group of hw.crusoe.* sysctls.
114 # CPU_FASTER_5X86_FPU enables faster FPU exception handler.
116 # CPU_GEODE is for the SC1100 Geode embedded processor. This option
117 # is necessary because the i8254 timecounter is toast.
119 # CPU_I486_ON_386 enables CPU cache on i486 based CPU upgrade products
122 # CPU_IORT defines I/O clock delay time (NOTE 1). Default values of
123 # I/O clock delay time on Cyrix 5x86 and 6x86 are 0 and 7,respectively
126 # CPU_L2_LATENCY specifies the L2 cache latency value. This option is used
127 # only when CPU_PPRO2CELERON is defined and Mendocino Celeron is detected.
128 # The default value is 5.
130 # CPU_LOOP_EN prevents flushing the prefetch buffer if the destination
131 # of a jump is already present in the prefetch buffer on Cyrix 5x86(NOTE
134 # CPU_PPRO2CELERON enables L2 cache of Mendocino Celeron CPUs. This option
135 # is useful when you use Socket 8 to Socket 370 converter, because most Pentium
136 # Pro BIOSs do not enable L2 cache of Mendocino Celeron CPUs.
138 # CPU_RSTK_EN enables return stack on Cyrix 5x86 (NOTE 1).
140 # CPU_SOEKRIS enables support www.soekris.com hardware.
142 # CPU_SUSP_HLT enables suspend on HALT. If this option is set, CPU
143 # enters suspend mode following execution of HALT instruction.
145 # CPU_UPGRADE_HW_CACHE eliminates unneeded cache flush instruction(s).
147 # CPU_WT_ALLOC enables write allocation on Cyrix 6x86/6x86MX and AMD
150 # CYRIX_CACHE_WORKS enables CPU cache on Cyrix 486 CPUs with cache
151 # flush at hold state.
153 # CYRIX_CACHE_REALLY_WORKS enables (1) CPU cache on Cyrix 486 CPUs
154 # without cache flush at hold state, and (2) write-back CPU cache on
155 # Cyrix 6x86 whose revision < 2.7 (NOTE 2).
157 # NO_F00F_HACK disables the hack that prevents Pentiums (and ONLY
158 # Pentiums) from locking up when a LOCK CMPXCHG8B instruction is
159 # executed. This option is only needed if I586_CPU is also defined,
160 # and should be included for any non-Pentium CPU that defines it.
162 # NO_MEMORY_HOLE is an optimisation for systems with AMD K6 processors
163 # which indicates that the 15-16MB range is *definitely* not being
164 # occupied by an ISA memory hole.
166 # NOTE 1: The options, CPU_BTB_EN, CPU_LOOP_EN, CPU_IORT,
167 # CPU_LOOP_EN and CPU_RSTK_EN should not be used because of CPU bugs.
168 # These options may crash your system.
170 # NOTE 2: If CYRIX_CACHE_REALLY_WORKS is not set, CPU cache is enabled
171 # in write-through mode when revision < 2.7. If revision of Cyrix
172 # 6x86 >= 2.7, CPU cache is always enabled in write-back mode.
174 # NOTE 3: This option may cause failures for software that requires
175 # locked cycles in order to operate correctly.
177 options CPU_ATHLON_SSE_HACK
178 options CPU_BLUELIGHTNING_3X
179 options CPU_BLUELIGHTNING_FPU_OP_CACHE
181 options CPU_DIRECT_MAPPED_CACHE
182 options CPU_DISABLE_5X86_LSSER
183 options CPU_DISABLE_CMPXCHG
184 #options CPU_DISABLE_SSE
187 options CPU_ELAN_XTAL=32768000
188 options CPU_ENABLE_LONGRUN
189 options CPU_FASTER_5X86_FPU
191 options CPU_I486_ON_386
193 options CPU_L2_LATENCY=5
195 options CPU_PPRO2CELERON
199 options CPU_UPGRADE_HW_CACHE
201 options CYRIX_CACHE_WORKS
202 options CYRIX_CACHE_REALLY_WORKS
203 #options NO_F00F_HACK
206 options NPX_DEBUG # enable npx debugging
209 # PERFMON causes the driver for Pentium/Pentium Pro performance counters
210 # to be compiled. See perfmon(4) for more information.
215 # XBOX causes the kernel to be bootable on the Microsoft XBox console system.
216 # The resulting kernel will auto-detect whether it is being booted on a XBox,
217 # so kernels compiled with this option will also work on an ordinary PC.
218 # This option require I686_CPU.
220 # xboxfb includes support for the XBox frame buffer device. It is fully USB-
221 # keyboard aware, and will only be used if an xbox is detected. This option
222 # (obviously) requires XBOX support in your kernel.
224 # NOTE: xboxfb currently conflicts with syscons(4); if you have an XBOX and
225 # include both in your kernel; you will not get any video output. Ordinary
226 # PC's do not suffer from this.
232 #####################################################################
236 # DEVICE_POLLING adds support for mixed interrupt-polling handling
237 # of network device drivers, which has significant benefits in terms
238 # of robustness to overloads and responsivity, as well as permitting
239 # accurate scheduling of the CPU time between kernel network processing
240 # and other activities. The drawback is a moderate (up to 1/HZ seconds)
241 # potential increase in response times.
242 # It is strongly recommended to use HZ=1000 or 2000 with DEVICE_POLLING
243 # to achieve smoother behaviour.
244 # Additionally, you can enable/disable polling at runtime with help of
245 # the ifconfig(8) utility, and select the CPU fraction reserved to
246 # userland with the sysctl variable kern.polling.user_frac
247 # (default 50, range 0..100).
249 # Not all device drivers support this mode of operation at the time of
250 # this writing. See polling(4) for more details.
252 options DEVICE_POLLING
254 # BPF_JITTER adds support for BPF just-in-time compiler.
259 #####################################################################
262 # Provide read/write access to the memory in the clock chip.
263 device nvram # Access to rtc cmos via /dev/nvram
266 #####################################################################
267 # MISCELLANEOUS DEVICES AND OPTIONS
269 device speaker #Play IBM BASIC-style noises out your speaker
270 hint.speaker.0.at="isa"
271 hint.speaker.0.port="0x61"
272 device gzip #Exec gzipped a.out's. REQUIRES COMPAT_AOUT!
273 device apm_saver # Requires APM
276 #####################################################################
277 # HARDWARE BUS CONFIGURATION
282 device isa # Required by npx(4)
287 # AUTO_EOI_1 enables the `automatic EOI' feature for the master 8259A
288 # interrupt controller. This saves about 0.7-1.25 usec for each interrupt.
289 # This option breaks suspend/resume on some portables.
291 # AUTO_EOI_2 enables the `automatic EOI' feature for the slave 8259A
292 # interrupt controller. This saves about 0.7-1.25 usec for each interrupt.
293 # Automatic EOI is documented not to work for for the slave with the
294 # original i8259A, but it works for some clones and some integrated
297 # MAXMEM specifies the amount of RAM on the machine; if this is not
298 # specified, FreeBSD will first read the amount of memory from the CMOS
299 # RAM, so the amount of memory will initially be limited to 64MB or 16MB
300 # depending on the BIOS. If the BIOS reports 64MB, a memory probe will
301 # then attempt to detect the installed amount of RAM. If this probe
302 # fails to detect >64MB RAM you will have to use the MAXMEM option.
303 # The amount is in kilobytes, so for a machine with 128MB of RAM, it would
304 # be 131072 (128 * 1024).
306 # BROKEN_KEYBOARD_RESET disables the use of the keyboard controller to
307 # reset the CPU for reboot. This is needed on some systems with broken
308 # keyboard controllers.
313 options MAXMEM=(128*1024)
314 #options BROKEN_KEYBOARD_RESET
319 # The EISA bus device is `eisa'. It provides auto-detection and
320 # configuration support for all devices on the EISA bus.
324 # By default, only 10 EISA slots are probed, since the slot numbers
325 # above clash with the configuration address space of the PCI subsystem,
326 # and the EISA probe is not very smart about this. This is sufficient
327 # for most machines, but in particular the HP NetServer LC series comes
328 # with an onboard AIC7770 dual-channel SCSI controller on EISA slot #11,
329 # thus you need to bump this figure to 12 for them.
330 options EISA_SLOTS=12
335 # The MCA bus device is `mca'. It provides auto-detection and
336 # configuration support for all devices on the MCA bus.
337 # No hints are required for MCA.
342 # PCI bus & PCI options:
354 #####################################################################
355 # HARDWARE DEVICE CONFIGURATION
357 # To include support for VGA VESA video modes
360 # Turn on extra debugging checks and output for VESA support.
363 device dpms # DPMS suspend & resume via VESA BIOS
366 # The Numeric Processing eXtension driver. This is non-optional.
368 hint.npx.0.flags="0x0"
373 # 0x01 don't use the npx registers to optimize bcopy.
374 # 0x02 don't use the npx registers to optimize bzero.
375 # 0x04 don't use the npx registers to optimize copyin or copyout.
376 # The npx registers are normally used to optimize copying and zeroing when
377 # all of the following conditions are satisfied:
378 # I586_CPU is an option
379 # the cpu is an i586 (perhaps not a Pentium)
380 # the probe for npx0 succeeds
381 # INT 16 exception handling works.
382 # Then copying and zeroing using the npx registers is normally 30-100% faster.
383 # The flags can be used to control cases where it doesn't work or is slower.
384 # Setting them at boot time using hints works right (the optimizations
385 # are not used until later in the bootstrap when npx0 is attached).
386 # Flag 0x08 automatically disables the i586 optimized routines.
395 hint.psm.0.at="atkbdc"
399 options PSM_HOOKRESUME #hook the system resume event, useful
401 options PSM_RESETAFTERSUSPEND #reset the device at the resume event
403 # The keyboard controller; it controls the keyboard and the PS/2 mouse.
405 hint.atkbdc.0.at="isa"
406 hint.atkbdc.0.port="0x060"
410 hint.atkbd.0.at="atkbdc"
414 options ATKBD_DFLT_KEYMAP # specify the built-in keymap
415 makeoptions ATKBD_DFLT_KEYMAP=jp.106
418 # 0x01 Force detection of keyboard, else we always assume a keyboard
419 # 0x02 Don't reset keyboard, useful for some newer ThinkPads
420 # 0x03 Force detection and avoid reset, might help with certain
422 # 0x04 Old-style (XT) keyboard support, useful for older ThinkPads
424 # Video card driver for VGA adapters.
429 # Try the following option if the mouse pointer is not drawn correctly
430 # or font does not seem to be loaded properly. May cause flicker on
432 options VGA_ALT_SEQACCESS
434 # If you can dispense with some vga driver features, you may want to
435 # use the following options to save some memory.
436 #options VGA_NO_FONT_LOADING # don't save/load font
437 #options VGA_NO_MODE_CHANGE # don't change video modes
439 # Older video cards may require this option for proper operation.
440 options VGA_SLOW_IOACCESS # do byte-wide i/o's to TS and GDC regs
442 # The following option probably won't work with the LCD displays.
443 options VGA_WIDTH90 # support 90 column modes
448 # 3Dfx Voodoo Graphics, Voodoo II /dev/3dfx CDEV support. This will create
449 # the /dev/3dfx0 device to work with glide implementations. This should get
450 # linked to /dev/3dfx and /dev/voodoo. Note that this is not the same as
451 # the tdfx DRI module from XFree86 and is completely unrelated.
453 # To enable Linuxulator support, one must also include COMPAT_LINUX in the
454 # config as well. The other option is to load both as modules.
456 device tdfx # Enable 3Dfx Voodoo support
457 device tdfx_linux # Enable Linuxulator support
460 # ACPI support using the Intel ACPI Component Architecture reference
463 # ACPI_DEBUG enables the use of the debug.acpi.level and debug.acpi.layer
464 # kernel environment variables to select initial debugging levels for the
465 # Intel ACPICA code. (Note that the Intel code must also have USE_DEBUGGER
466 # defined when it is built).
468 # Note that building ACPI into the kernel is deprecated; the module is
469 # normally loaded automatically by the loader.
474 # ACPI WMI Mapping driver
477 # ACPI Asus Desktop Extras. (voltage, temp, fan)
480 # ACPI Asus Extras (LCD backlight/brightness, video output, etc.)
483 # ACPI Fujitsu Extras (Buttons)
486 # ACPI extras driver for HP laptops
489 # ACPI extras driver for IBM laptops
492 # ACPI Panasonic Extras (LCD backlight/brightness, video output, etc.)
493 device acpi_panasonic
495 # ACPI Sony extra (LCD brightness)
498 # ACPI Toshiba Extras (LCD backlight/brightness, video output, etc.)
501 # ACPI Video Extensions (LCD backlight/brightness, video output, etc.)
504 # ACPI Docking Station
507 # The cpufreq(4) driver provides support for non-ACPI CPU frequency control
510 # Direct Rendering modules for 3D acceleration.
511 device drm # DRM core module required by DRM drivers
512 device i915drm # Intel i830 through i915
513 device mach64drm # ATI Rage Pro, Rage Mobility P/M, Rage XL
514 device mgadrm # AGP Matrox G200, G400, G450, G550
515 device r128drm # ATI Rage 128
516 device radeondrm # ATI Radeon
517 device savagedrm # S3 Savage3D, Savage4
518 device sisdrm # SiS 300/305, 540, 630
519 device tdfxdrm # 3dfx Voodoo 3/4/5 and Banshee
520 options DRM_DEBUG # Include debug printfs (slow)
523 # mse: Logitech and ATI InPort bus mouse ports
527 hint.mse.0.port="0x23c"
531 # Network interfaces:
534 # ath: Atheros a/b/g WiFi adapters (requires ath_hal and wlan)
535 # ce: Cronyx Tau-PCI/32 sync single/dual port G.703/E1 serial adaptor
536 # with 32 HDLC subchannels (requires sppp (default), or NETGRAPH if
537 # NETGRAPH_CRONYX is configured)
538 # cp: Cronyx Tau-PCI sync single/dual/four port
539 # V.35/RS-232/RS-530/RS-449/X.21/G.703/E1/E3/T3/STS-1
540 # serial adaptor (requires sppp (default), or NETGRAPH if
541 # NETGRAPH_CRONYX is configured)
542 # cs: IBM Etherjet and other Crystal Semi CS89x0-based adapters
543 # ctau: Cronyx Tau sync dual port V.35/RS-232/RS-530/RS-449/X.21/G.703/E1
544 # serial adaptor (requires sppp (default), or NETGRAPH if
545 # NETGRAPH_CRONYX is configured)
546 # ed: Western Digital and SMC 80xx; Novell NE1000 and NE2000; 3Com 3C503
547 # HP PC Lan+, various PC Card devices
549 # ie: AT&T StarLAN 10 and EN100; 3Com 3C507; unknown NI5210;
551 # ipw: Intel PRO/Wireless 2100 IEEE 802.11 adapter
552 # iwi: Intel PRO/Wireless 2200BG/2225BG/2915ABG IEEE 802.11 adapters
553 # iwn: Intel Wireless WiFi Link 4965AGN 802.11 network adapters
554 # nfe: nVidia nForce MCP on-board Ethernet Networking (BSD open source)
555 # nve: nVidia nForce MCP on-board Ethernet Networking
556 # ral: Ralink Technology IEEE 802.11 wireless adapter
557 # sbni: Granch SBNI12-xx ISA and PCI adapters
558 # wl: Lucent Wavelan (ISA card only).
559 # wpi: Intel 3945ABG Wireless LAN controller
561 # Order for ISA/EISA devices is important here
563 device ath # Atheros pci/cardbus NIC's
564 device ath_hal # pci/cardbus chip support
565 #device ath_ar5210 # AR5210 chips
566 #device ath_ar5211 # AR5211 chips
567 #device ath_ar5212 # AR5212 chips
574 #device ath_ar5416 # AR5416 chips
575 options AH_SUPPORT_AR5416 # enable AR5416 tx/rx descriptors
576 device ath_rate_sample # SampleRate tx rate control for ath
581 hint.cs.0.port="0x300"
584 hint.ctau.0.port="0x240"
587 #options NETGRAPH_CRONYX # Enable NETGRAPH support for Cronyx adapter(s)
593 hint.ed.0.port="0x280"
595 hint.ed.0.maddr="0xd8000"
596 device ie # Hints only required for Starlan
598 hint.ie.2.port="0x300"
600 hint.ie.2.maddr="0xd0000"
604 # Hint for the i386-only ISA front-end of le(4).
606 hint.le.0.port="0x280"
609 device nfe # nVidia nForce MCP on-board Ethernet Networking
610 device nve # nVidia nForce MCP on-board Ethernet Networking
614 hint.sbni.0.port="0x210"
615 hint.sbni.0.irq="0xefdead"
616 hint.sbni.0.flags="0"
619 hint.wl.0.port="0x300"
620 options WLCACHE # enables the signal-strength cache
621 options WLDEBUG # enables verbose debugging output
630 # Areca 11xx and 12xx series of SATA II RAID controllers.
633 device arcmsr # Areca SATA II RAID
636 # 3ware 9000 series PATA/SATA RAID controller driver and options.
637 # The driver is implemented as a SIM, and so, needs the CAM infrastructure.
639 options TWA_DEBUG # 0-10; 10 prints the most messages.
640 options TWA_FLASH_FIRMWARE # firmware image bundled when defined.
641 device twa # 3ware 9000 series PATA/SATA RAID
644 # SCSI host adapters:
646 # ncv: NCR 53C500 based SCSI host adapters.
647 # nsp: Workbit Ninja SCSI-3 based PC Card SCSI host adapters.
648 # stg: TMC 18C30, 18C50 based SCSI host adapters.
654 hint.stg.0.port="0x140"
658 # Adaptec FSA RAID controllers, including integrated DELL controllers,
659 # the Dell PERC 2/QC and the HP NetRAID-4M
661 device aacp # SCSI Passthrough interface (optional, CAM required)
663 # The 'asr' driver provides support for current DPT/Adaptec SCSI RAID
664 # controllers (SmartRAID V and VI and later).
665 # These controllers require the CAM infrastructure.
670 # Highpoint RocketRAID 182x.
674 # Highpoint RocketRAID. Supports RR172x, RR222x, RR2240, RR232x, RR2340,
675 # RR2210, RR174x, RR2522, RR231x, RR230x.
679 # Highpoint RocketRaid 3xxx series SATA RAID
683 # IBM (now Adaptec) ServeRAID controllers
687 # SafeNet crypto driver: can be moved to the MI NOTES as soon as
688 # it's tested on a big-endian machine
690 device safe # SafeNet 1141
691 options SAFE_DEBUG # enable debugging support: hw.safe.debug
692 options SAFE_RNDTEST # enable rndtest support
695 # glxsb is a driver for the Security Block in AMD Geode LX processors.
696 # Requires 'device crypto'.
698 device glxsb # AMD Geode LX Security Block
700 #####################################################################
703 # Miscellaneous hardware:
705 # apm: Laptop Advanced Power Management (experimental)
706 # ipmi: Intelligent Platform Management Interface
707 # smapi: System Management Application Program Interface driver
708 # smbios: DMI/SMBIOS entry point
709 # vpd: Vital Product Data kernel interface
710 # pmtimer: Adjust system timer at wakeup time
711 # pbio: Parallel (8255 PPI) basic I/O (mode 0) port (e.g. Advantech PCL-724)
712 # spic: Sony Programmable I/O controller (VAIO notebooks)
713 # asmc: Apple System Management Controller
714 # si: Specialix International SI/XIO or SX intelligent serial card driver
717 # The flags takes the following meaning for apm0:
718 # 0x0020 Statclock is broken.
720 # Notes on the Specialix SI/XIO driver:
721 # The host card is memory, not IO mapped.
722 # The Rev 1 host cards use a 64K chunk, on a 32K boundary.
723 # The Rev 2 host cards use a 32K chunk, on a 32K boundary.
724 # The cards can use an IRQ of 11, 12 or 15.
726 # Notes on the Sony Programmable I/O controller
727 # This is a temporary driver that should someday be replaced by something
728 # that hooks into the ACPI layer. The device is hooked to the PIIX4's
729 # General Device 10 decoder, which means you have to fiddle with PCI
730 # registers to map it in, even though it is otherwise treated here as
731 # an ISA device. At the moment, the driver polls, although the device
732 # is capable of generating interrupts. It largely undocumented.
733 # The port location in the hint is where you WANT the device to be
734 # mapped. 0x10a0 seems to be traditional. At the moment the jogdial
735 # is the only thing truly supported, but apparently a fair percentage
736 # of the Vaio extra features are controlled by this device.
739 hint.apm.0.flags="0x20"
747 hint.pbio.0.port="0x360"
750 hint.spic.0.port="0x10a0"
755 # Laptop/Notebook options:
758 # apm under `Miscellaneous hardware'
761 # For older notebooks that signal a powerfail condition (external
762 # power supply dropped, or battery state low) by issuing an NMI:
764 options POWERFAIL_NMI # make it beep instead of panicing
769 # Philips i2c bus support is provided by the `iicbus' device.
771 # Supported interfaces:
772 # pcf Philips PCF8584 ISA-bus controller
776 hint.pcf.0.port="0x320"
780 # Hardware watchdog timers:
782 # ichwd: Intel ICH watchdog timer
787 # Temperature sensors:
789 # coretemp: on-die sensor on Intel Core and newer CPUs
794 # CPU control pseudo-device. Provides access to MSRs, CPUID info and
795 # microcode update feature.
800 # System Management Bus (SMB)
802 options ENABLE_ALART # Control alarm on Intel intpm driver
805 # Set the number of PV entries per process. Increasing this can
806 # stop panics related to heavy use of shared memory. However, that can
807 # (combined with large amounts of physical memory) cause panics at
808 # boot time due the kernel running out of VM space.
810 # If you're tweaking this, you might also want to increase the sysctls
811 # "vm.v_free_min", "vm.v_free_reserved", and "vm.v_free_target".
813 # The value below is the one more than the default.
815 options PMAP_SHPGPERPROC=201
818 # Change the size of the kernel virtual address space. Due to
819 # constraints in loader(8) on i386, this must be a multiple of 4.
820 # 256 = 1 GB of kernel address space. Increasing this also causes
821 # a reduction of the address space in user processes. 512 splits
822 # the 4GB cpu address space in half (2GB user, 2GB kernel). For PAE
823 # kernels, the value will need to be double non-PAE. A value of 1024
824 # for PAE kernels is necessary to split the address space in half.
825 # This will likely need to be increased to handle memory sizes >4GB.
826 # PAE kernels default to a value of 512.
828 options KVA_PAGES=260
831 #####################################################################
834 # Enable iBCS2 runtime support for SCO and ISC binaries
837 # Emulate spx device for client side of SVR3 local X interface
840 # Enable Linux ABI emulation
843 # Enable i386 a.out binary support
846 # Enable the linux-like proc filesystem support (requires COMPAT_LINUX
850 #Enable the linux-like sys filesystem support (requires COMPAT_LINUX
855 # SysVR4 ABI emulation
857 # The svr4 ABI emulator can be statically compiled into the kernel or loaded as
859 # The STREAMS network emulation code can also be compiled statically or as a
860 # module. If loaded as a module, it must be loaded before the svr4 module
861 # (the /usr/sbin/svr4 script does this for you). If compiling statically,
862 # the `streams' device must be configured into any kernel which also
863 # specifies COMPAT_SVR4. It is possible to have a statically-configured
864 # STREAMS device and a dynamically loadable svr4 emulator; the /usr/sbin/svr4
865 # script understands that it doesn't need to load the `streams' module under
866 # those circumstances.
867 # Caveat: At this time, `options KTRACE' is required for the svr4 emulator
868 # (whether static or dynamic).
870 options COMPAT_SVR4 # build emulator statically
871 options DEBUG_SVR4 # enable verbose debugging
872 device streams # STREAMS network driver (required for svr4).
874 # Enable NDIS binary driver support
879 #####################################################################
882 # Disable the 4 MByte page PSE CPU feature. The PSE feature allows the
883 # kernel to use 4 MByte pages to map the kernel instead of 4k pages.
884 # This saves on the amount of memory needed for page tables needed to
885 # map the kernel. You should only disable this feature as a temporary
886 # workaround if you are having problems with it enabled.
890 # Disable the global pages PGE CPU feature. The PGE feature allows pages
891 # to be marked with the PG_G bit. TLB entries for these pages are not
892 # flushed from the cache when %cr3 is reloaded. This can make context
893 # switches less expensive. You should only disable this feature as a
894 # temporary workaround if you are having problems with it enabled.
896 #options DISABLE_PG_G
898 # KSTACK_PAGES is the number of memory pages to assign to the kernel
899 # stack of each thread.
901 options KSTACK_PAGES=3
903 #####################################################################
905 # More undocumented options for linting.
906 # Note that documenting these are not considered an affront.
908 options FB_INSTALL_CDEV # install a CDEV entry in /dev
910 options I586_PMC_GUPROF=0x70000
911 options KBDIO_DEBUG=2
912 options KBD_MAXRETRY=4
913 options KBD_MAXWAIT=6
914 options KBD_RESETDELAY=201
918 options TIMER_FREQ=((14318182+6)/12)
921 options VM_KMEM_SIZE_MAX
922 options VM_KMEM_SIZE_SCALE
925 # asr old ioctls support, needed by raidutils