NOTES (revision 19261079b74319502c6ffa1249920079f0f69a72) - 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.
#
# $FreeBSD$
#

#
# Enable the kernel DTrace hooks which are required to load the DTrace
# kernel modules.
#
options 	KDTRACE_HOOKS

# DTrace core
# NOTE: introduces CDDL-licensed components into the kernel
#device		dtrace

# DTrace modules
#device		dtrace_profile
#device		dtrace_sdt
#device		dtrace_fbt
#device		dtrace_systrace
#device		dtrace_prototype
#device		dtnfscl
#device		dtmalloc

# Alternatively include all the DTrace modules
#device		dtraceall


#####################################################################
# SMP OPTIONS:
#
# Notes:
#
# IPI_PREEMPTION instructs the kernel to preempt threads running on other
#	  CPUS if needed.  Relies on the PREEMPTION option

# Optional:
options 	IPI_PREEMPTION
device		atpic			# Optional legacy pic support
device		mptable			# Optional MPSPEC mptable support

#
# Watchdog routines.
#
options 	MP_WATCHDOG

# Debugging options.
#
options 	COUNT_XINVLTLB_HITS	# Counters for TLB events
options 	COUNT_IPIS		# Per-CPU IPI interrupt counters


#####################################################################
# 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.
#


#####################################################################
# 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 help of
# the ifconfig(8) utility, 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

# BPF_JITTER adds support for BPF just-in-time compiler.

options 	BPF_JITTER

# OpenFabrics Enterprise Distribution (Infiniband).
options 	OFED
options 	OFED_DEBUG_INIT

# Sockets Direct Protocol
options 	SDP
options 	SDP_DEBUG

# IP over Infiniband
options 	IPOIB
options 	IPOIB_DEBUG
options 	IPOIB_CM


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

# Provide read/write access to the memory in the clock chip.
device		nvram		# Access to rtc cmos via /dev/nvram


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

device		speaker		#Play IBM BASIC-style noises out your speaker
envvar		hint.speaker.0.at="isa"
envvar		hint.speaker.0.port="0x61"


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

#
# AGP GART support
device		agp

#
# AGP debugging.
#
options 	AGP_DEBUG


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

# To include support for VGA VESA video modes
options 	VESA

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

device		dpms		# DPMS suspend & resume via VESA BIOS

# x86 real mode BIOS emulator, required by atkbdc/dpms/vesa
options 	X86BIOS

#
# Optional devices:
#

# PS/2 mouse
device		psm
envvar		hint.psm.0.at="atkbdc"
envvar		hint.psm.0.irq="12"

# Options for psm:
options 	PSM_HOOKRESUME		#hook the system resume event, useful
					#for some laptops
options 	PSM_RESETAFTERSUSPEND	#reset the device at the resume event

# The keyboard controller; it controls the keyboard and the PS/2 mouse.
device		atkbdc
envvar		hint.atkbdc.0.at="isa"
envvar		hint.atkbdc.0.port="0x060"

# The AT keyboard
device		atkbd
envvar		hint.atkbd.0.at="atkbdc"
envvar		hint.atkbd.0.irq="1"

# Options for atkbd:
options 	ATKBD_DFLT_KEYMAP	# specify the built-in keymap
makeoptions	ATKBD_DFLT_KEYMAP=fr.dvorak

# `flags' for atkbd:
#       0x01    Force detection of keyboard, else we always assume a keyboard
#       0x02    Don't reset keyboard, useful for some newer ThinkPads
#	0x03	Force detection and avoid reset, might help with certain
#		dockingstations
#       0x04    Old-style (XT) keyboard support, useful for older ThinkPads

# Video card driver for VGA adapters.
device		vga
envvar		hint.vga.0.at="isa"

# Options for vga:
# Try the following option if the mouse pointer is not drawn correctly
# or font does not seem to be loaded properly.  May cause flicker on
# some systems.
options 	VGA_ALT_SEQACCESS

# If you can dispense with some vga driver features, you may want to
# use the following options to save some memory.
#options 	VGA_NO_FONT_LOADING	# don't save/load font
#options 	VGA_NO_MODE_CHANGE	# don't change video modes

# Older video cards may require this option for proper operation.
options 	VGA_SLOW_IOACCESS	# do byte-wide i/o's to TS and GDC regs

# The following option probably won't work with the LCD displays.
options 	VGA_WIDTH90		# support 90 column modes

# Debugging.
options 	VGA_DEBUG

# vt(4) drivers.
device		vt_vga		# VGA
device		vt_efifb	# EFI framebuffer
device		vt_vbefb	# VBE framebuffer

# Linear framebuffer driver for S3 VESA 1.2 cards. Works on top of VESA.
device		s3pci

# 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.
#

device		tdfx			# Enable 3Dfx Voodoo 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).

device		acpi
options 	ACPI_DEBUG

# The cpufreq(4) driver provides support for non-ACPI CPU frequency control
device		cpufreq

#
# Network interfaces:
#

# bxe:  Broadcom NetXtreme II (BCM5771X/BCM578XX) PCIe 10Gb Ethernet
#       adapters.
# ice:	Intel 800 Series Physical Function
#	Requires the ice_ddp module for full functionality
# igc:	Intel I225 2.5Gb Ethernet adapter
# ipw:	Intel PRO/Wireless 2100 IEEE 802.11 adapter
#	Requires the ipw firmware module
# iwi:	Intel PRO/Wireless 2200BG/2225BG/2915ABG IEEE 802.11 adapters
#	Requires the iwi firmware module
# iwn:	Intel Wireless WiFi Link 1000/105/135/2000/4965/5000/6000/6050 abgn
#	802.11 network adapters
#	Requires the iwn firmware module
# mthca: Mellanox HCA InfiniBand
# mlx4ib: Mellanox ConnectX HCA InfiniBand
# mlx4en: Mellanox ConnectX HCA Ethernet
# nfe:	nVidia nForce MCP on-board Ethernet Networking (BSD open source)
# sfxge: Solarflare SFC9000 family 10Gb Ethernet adapters
# vmx:	VMware VMXNET3 Ethernet (BSD open source)
# wpi:	Intel 3945ABG Wireless LAN controller
#	Requires the wpi firmware module
# axp: AMD EPYC integrated NIC
#   Requires the miibus module

device		bxe		# Broadcom NetXtreme II BCM5771X/BCM578XX 10GbE
options 	ED_3C503
options 	ED_HPP
options 	ED_SIC
device		igc		# Intel I225 2.5G Ethernet
device		ipw		# Intel 2100 wireless NICs.
device		iwi		# Intel 2200BG/2225BG/2915ABG wireless NICs.
device		iwn		# Intel 4965/1000/5000/6000 wireless NICs.
device		ixl		# Intel 700 Series Physical Function
device		iavf		# Intel Adaptive Virtual Function
device		ice		# Intel 800 Series Physical Function
device		ice_ddp		# Intel 800 Series DDP Package
device  	mthca		# Mellanox HCA InfiniBand
device  	mlx4		# Shared code module between IB and Ethernet
device  	mlx4ib		# Mellanox ConnectX HCA InfiniBand
device  	mlx4en		# Mellanox ConnectX HCA Ethernet
device		nfe		# nVidia nForce MCP on-board Ethernet
device		sfxge		# Solarflare SFC9000 10Gb Ethernet
device		vmx		# VMware VMXNET3 Ethernet
device		wpi		# Intel 3945ABG wireless NICs.
device		axp		# AMD EPYC integrated NIC

# IEEE 802.11 adapter firmware modules

# Intel PRO/Wireless 2100 firmware:
#   ipwfw:		BSS/IBSS/monitor mode firmware
#   ipwbssfw:		BSS mode firmware
#   ipwibssfw:		IBSS mode firmware
#   ipwmonitorfw:	Monitor mode firmware
# Intel PRO/Wireless 2200BG/2225BG/2915ABG firmware:
#   iwifw:		BSS/IBSS/monitor mode firmware
#   iwibssfw:		BSS mode firmware
#   iwiibssfw:		IBSS mode firmware
#   iwimonitorfw:	Monitor mode firmware
# Intel Wireless WiFi Link 4965/1000/5000/6000 series firmware:
#   iwnfw:		Single module to support all devices
#   iwn1000fw:		Specific module for the 1000 only
#   iwn105fw:		Specific module for the 105 only
#   iwn135fw:		Specific module for the 135 only
#   iwn2000fw:		Specific module for the 2000 only
#   iwn2030fw:		Specific module for the 2030 only
#   iwn4965fw:		Specific module for the 4965 only
#   iwn5000fw:		Specific module for the 5000 only
#   iwn5150fw:		Specific module for the 5150 only
#   iwn6000fw:		Specific module for the 6000 only
#   iwn6000g2afw:	Specific module for the 6000g2a only
#   iwn6000g2bfw:	Specific module for the 6000g2b only
#   iwn6050fw:		Specific module for the 6050 only
# wpifw:	Intel 3945ABG Wireless LAN Controller firmware

device		iwifw
device		iwibssfw
device		iwiibssfw
device		iwimonitorfw
device		ipwfw
device		ipwbssfw
device		ipwibssfw
device		ipwmonitorfw
device		iwnfw
device		iwn1000fw
device		iwn105fw
device		iwn135fw
device		iwn2000fw
device		iwn2030fw
device		iwn4965fw
device		iwn5000fw
device		iwn5150fw
device		iwn6000fw
device		iwn6000g2afw
device		iwn6000g2bfw
device		iwn6050fw
device		wpifw

#
# Non-Transparent Bridge (NTB) drivers
#
device		if_ntb		# Virtual NTB network interface
device		ntb_transport	# NTB packet transport driver
device		ntb		# NTB hardware interface
device		ntb_hw_amd	# AMD NTB hardware driver
device		ntb_hw_intel	# Intel NTB hardware driver
device		ntb_hw_plx	# PLX NTB hardware driver

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

#
# Areca 11xx and 12xx series of SATA II RAID controllers.
# CAM is required.
#
device		arcmsr		# Areca SATA II RAID

#
# Microsemi smartpqi controllers.
# These controllers have a SCSI-like interface, and require the
# CAM infrastructure.
#
device		smartpqi

#
# 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.
device		twa			# 3ware 9000 series PATA/SATA RAID

#
# 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)

#
# Highpoint RocketRAID 27xx.
device		hpt27xx

#
# Highpoint RocketRAID 182x.
device		hptmv

#
# Highpoint DC7280 and R750.
device		hptnr

#
# Highpoint RocketRAID.  Supports RR172x, RR222x, RR2240, RR232x, RR2340,
# RR2210, RR174x, RR2522, RR231x, RR230x.
device		hptrr

#
# Highpoint RocketRaid 3xxx series SATA RAID
device		hptiop

#
# IBM (now Adaptec) ServeRAID controllers
device		ips

#
# Intel integrated Memory Controller (iMC) SMBus controller
#	Sandybridge-Xeon, Ivybridge-Xeon, Haswell-Xeon, Broadwell-Xeon
device		imcsmb

#
# Intel C600 (Patsburg) integrated SAS controller
device		isci
options 	ISCI_LOGGING	# enable debugging in isci HAL

#
# NVM Express (NVMe) support
device         nvme    # base NVMe driver
device         nvd     # expose NVMe namespaces as disks, depends on nvme

#
# Intel Volume Management Device (VMD) support
device		vmd

#
# PMC-Sierra SAS/SATA controller
device		pmspcv

#
# Intel QuickAssist
device		qat

#
# 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

#
# VirtIO support
#
# The virtio entry provides a generic bus for use by the device drivers.
# It must be combined with an interface that communicates with the host.
# Multiple such interfaces are defined by the VirtIO specification. FreeBSD
# only has support for PCI. Therefore, virtio_pci must be statically
# compiled in or loaded as a module for the device drivers to function.
#
device		virtio		# Generic VirtIO bus (required)
device		virtio_pci	# VirtIO PCI Interface
device		vtnet		# VirtIO Ethernet device
device		virtio_blk	# VirtIO Block device
device		virtio_scsi	# VirtIO SCSI device
device		virtio_balloon	# VirtIO Memory Balloon device
device		virtio_random	# VirtIO Entropy device
device		virtio_console	# VirtIO Console device

# Linux KVM paravirtualization support
device		kvm_clock	# KVM paravirtual clock driver

# Microsoft Hyper-V enhancement support
device 		hyperv		# HyperV drivers

# Xen HVM Guest Optimizations
options 	XENHVM		# Xen HVM kernel infrastructure
device 		xenpci		# Xen HVM Hypervisor services driver
device		xentimer	# Xen x86 PV timer device

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

#
# Miscellaneous hardware:
#
# ipmi: Intelligent Platform Management Interface
# pbio: Parallel (8255 PPI) basic I/O (mode 0) port (e.g. Advantech PCL-724)
# smbios: DMI/SMBIOS entry point (requires EFIRT option)
# vpd: Vital Product Data kernel interface
# asmc: Apple System Management Controller
# si: Specialix International SI/XIO or SX intelligent serial card
# tpm: Trusted Platform Module

# 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		ipmi
device		pbio
envvar		hint.pbio.0.at="isa"
envvar		hint.pbio.0.port="0x360"
device		smbios
device		vpd
device		asmc
device		tpm
device		padlock_rng	# VIA Padlock RNG
device		rdrand_rng	# Intel Bull Mountain RNG
device		aesni		# AES-NI OpenCrypto module
device		ossl		# OpenSSL OpenCrypto module
device		ioat		# Intel I/OAT DMA engine

#
# Laptop/Notebook options:
#

device backlight

#
# I2C Bus
#

#
# Hardware watchdog timers:
#
# ichwd: Intel ICH watchdog timer
# amdsbwd: AMD SB7xx watchdog timer
# viawd: VIA south bridge watchdog timer
# wbwd: Winbond watchdog timer
# itwd: ITE Super I/O watchdog timer
#
device		ichwd
device		amdsbwd
device		viawd
device		wbwd
device		itwd

#
# Temperature sensors:
#
# coretemp: on-die sensor on Intel Core and newer CPUs
# amdtemp: on-die sensor on AMD K8/K10/K11 CPUs
#
device		coretemp
device		amdtemp

#
# CPU control pseudo-device. Provides access to MSRs, CPUID info and
# microcode update feature.
#
device		cpuctl

#
# SuperIO driver.
#
device		superio

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

#
# AMD System Management Network (SMN)
#
device		amdsmn

#
# Number of initial kernel page table pages used for early bootstrap.
# This number should include enough pages to map the kernel and any
# modules or other data loaded with the kernel by the loader.  Each
# page table page maps 2MB.
#
options 	NKPT=31

# EFI Runtime Services support
options 	EFIRT

#
# HID-over-I2C support
#
device		iichid		# HID-over-I2C support
options 	IICHID_DEBUG	# Enable HID-over-I2C debug messages
options 	IICHID_SAMPLING	# Workaround missing GPIO INTR support

#####################################################################
# 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_FREEBSD32

# Enable (32-bit) a.out binary support
options 	COMPAT_AOUT

# Enable 32-bit runtime support for CloudABI binaries.
options 	COMPAT_CLOUDABI32

# Enable 64-bit runtime support for CloudABI binaries.
options 	COMPAT_CLOUDABI64

#####################################################################
# ZFS support

# NB: This depends on crypto, cryptodev and ZSTDIO
options		ZFS

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

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

options 	KSTACK_PAGES=5

# Enable detailed accounting by the PV entry allocator.

options 	PV_STATS

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

# 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

# GCOV (code coverage) support

options		LINDEBUGFS
options		GCOV