NOTES (revision a35d88931c87cfe6bd38f01d7bad22140b3b38f3) - OpenGrok cross reference for /freebsd/sys/amd64/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 AMD64 family based machines.
#
machine		amd64

#
# We want LINT to cover profiling as well.
#XXX#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:
#
# 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.
#

# Optional:
device		atpic			# Optional legacy pic support
device		mptable			# Optional MPSPEC mptable support
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.
#
cpu		HAMMER			# aka K8, aka Opteron & Athlon64

#
# Options for CPU features.
#

#
# PERFMON causes the driver for Pentium/Pentium Pro performance counters
# to be compiled.  See perfmon(4) for more information.
#
#XXX#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).
#
# Not all device drivers support this mode of operation at the time of
# this writing.  See polling(4) for more details.

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 causes clock calibration to be run in a loop at
# startup until the user presses a key.  (The i8254 clock is always
# calibrated relative to the RTC (mc146818a) and this option causes the
# calibration to be repeated.)
options 	CLK_CALIBRATION_LOOP

# CLK_USE_I8254_CALIBRATION causes the calibrated frequency of the i8254
# clock to actually be used.
options 	CLK_USE_I8254_CALIBRATION


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

device		gzip		#Exec gzipped a.out's.  REQUIRES COMPAT_AOUT!


#####################################################################
# 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 	AUTO_EOI_1
#options 	AUTO_EOI_2

options 	MAXMEM=(128*1024)
#options 	BROKEN_KEYBOARD_RESET

#
# PCI bus & PCI options:
#
device		pci

#
# AGP GART support
device		agp


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

#
# 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
#XXX#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

#
# Network interfaces:
#

# ath:  Atheros a/b/g WiFi adapters (requires ath_hal and wlan)
# ed:   Western Digital and SMC 80xx; Novell NE1000 and NE2000; 3Com 3C503
#       HP PC Lan+, various PC Card devices (refer to etc/defaults/pccard.conf)
#       (requires miibus)
# lnc:  Lance/PCnet cards (Isolan, Novell NE2100, NE32-VL, AMD Am7990 and
#       Am79C960)

#XXX#	still calls MD i386 kvtop function instead of vtophys etc
#XXX#device		ed
#XXX#device		lnc

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

#
# ATA raid adapters
#
#XXX this stores pointers in a 32bit field that is defined by the hardware
#device	pst

#
# 3ware 9000 series PATA/SATA RAID controller driver and options.
# The driver is implemented as a SIM, and so, needs the CAM infrastructure.
#
options		TWA_DEBUG		# 0-10; 10 prints the most messages.
options		TWA_FLASH_FIRMWARE	# firmware image bundled when defined.
device		twa			# 3ware 9000 series PATA/SATA RAID

#
# 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

#
# 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:
#
# cy: Cyclades serial driver
# digi: Digiboard driver

# 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.

device		cy
options 	CY_PCI_FASTINTR		# Use with cy_pci unless irq is shared
device		digi
# 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
# sx device is i386 and pc98 only at the moment.
device		sx
options 	SX_DEBUG
# HOT1 Xilinx 6200 card (http://www.vcc.com/)
device		xrpu

#
# Laptop/Notebook options:
#


#
# I2C Bus
#

#---------------------------------------------------------------------------
# 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
#	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)
#
#XXX#device	isic
#
# PCI bus Cards:
# --------------
#
# ELSA MicroLink ISDN/PCI (same as ELSA QuickStep 1000pro PCI)
options 	ELSA_QS1PCI
#
#---------------------------------------------------------------------------
#	ifpi2 driver for AVM Fritz!Card PCI version 2
#
# AVM Fritz!Card PCI version 2
#XXX#device	ifpi2
#
#---------------------------------------------------------------------------
#	iwic driver for Winbond W6692 chipset
#
# ASUSCOM P-IN100-ST-D (and other Winbond W6692 based cards)
#XXX#device	iwic
#
#---------------------------------------------------------------------------
#	itjc driver for Siemens ISAC / TJNet Tiger300/320 chipset
#
# Traverse Technologies NETjet-S
# Teles PCI-TJ
#XXX#device	itjc
#
#---------------------------------------------------------------------------
#	iavc driver (AVM active cards, needs i4bcapi driver!)
#
#XXX#device	iavc
#
#---------------------------------------------------------------------------
#	ISDN Protocol Stack - mandatory for all hardware drivers
#
# Q.921 / layer 2 - i4b passive cards D channel handling
#XXX#device	i4bq921
#
# Q.931 / layer 3 - i4b passive cards D channel handling
#XXX#device	i4bq931
#
# layer 4 - i4b common passive and active card handling
#XXX#device	i4b
#
#---------------------------------------------------------------------------
#	ISDN devices - mandatory for all hardware drivers
#
# userland driver to do ISDN tracing (for passive cards only)
#XXX#device	i4btrc
#XXX#options	NI4BTRC=4
#
# userland driver to control the whole thing
#XXX#device	i4bctl
#
#---------------------------------------------------------------------------
#	ISDN devices - optional
#
# userland driver for access to raw B channel
#XXX#device	i4brbch
#XXX#options	NI4BRBCH=4
#
# userland driver for telephony
#XXX#device	i4btel
#XXX#options 	NI4BTEL=2
#
# network driver for IP over raw HDLC ISDN
#XXX#device	i4bipr
#XXX#options 	NI4BIPR=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
#XXX#device	i4bisppp
#XXX#options 	NI4BISPPP=4
#
# B-channel interface to the netgraph subsystem
#XXX#device	i4bing
#XXX#options	NI4BING=2
#
# CAPI driver needed for active ISDN cards (see iavc driver above)
#XXX#device	i4bcapi
#
#---------------------------------------------------------------------------

#
# System Management Bus (SMB)
#
options 	ENABLE_ALART		# Control alarm on Intel intpm driver

#
# 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


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

#XXX keep these here for now and reactivate when support for emulating
#XXX these 32 bit binaries is added.

# Enable 32-bit runtime support for FreeBSD/i386 binaries.
options 	COMPAT_IA32

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

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

# Enable Linux ABI emulation
#XXX#options 	COMPAT_LINUX

# Enable 32-bit Linux ABI emulation (requires COMPAT_43 and COMPAT_IA32)
options 	COMPAT_LINUX32

# Enable the linux-like proc filesystem support (requires COMPAT_LINUX32
# 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).
#
#XXX#options 	COMPAT_SVR4	# build emulator statically
#XXX#options 	DEBUG_SVR4	# enable verbose debugging
#XXX#device	streams		# STREAMS network driver (required for svr4).


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

# 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

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


# The I/O device
device		io