NOTES (revision 32a31d0d6f54cf53330aa533d619e60fb9ce86b7) - 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 386 family based IBM-PC and
# compatibles.
#
machine		amd64
cpu			HAMMER

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


# 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


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

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 	MAXMEM=(128*1024)
#options 	BROKEN_KEYBOARD_RESET

#
# PCI bus & PCI options:
#
device		pci

#
# AGP GART support
device		agp


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

#
# Mandatory devices:
#

#
# Optional devices:
#

#
# 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).
#
# Note that building ACPI into the kernel is deprecated; the module is
# normally loaded automatically by the loader.
#
device		acpi
options 	ACPI_DEBUG

# DRM options:
# mgadrm:    AGP Matrox G200, G400, G450, G550
# tdfxdrm:   3dfx Voodoo 3/4/5 and Banshee
# r128drm:   ATI Rage 128
# radeondrm: ATI Radeon up to 9000/9100
# 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		tdfxdrm

options 	DRM_DEBUG

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

#
# Network interfaces:
#

# 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)
# ie:   AT&T StarLAN 10 and EN100; 3Com 3C507; unknown NI5210;
#       Intel EtherExpress
# lnc:  Lance/PCnet cards (Isolan, Novell NE2100, NE32-VL, AMD Am7990 and
#       Am79C960)
# 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		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		lnc
hint.lnc.0.at="isa"
hint.lnc.0.port="0x280"
hint.lnc.0.irq="10"
hint.lnc.0.drq="0"
device		sr
hint.sr.0.at="isa"
hint.sr.0.port="0x300"
hint.sr.0.irq="5"
hint.sr.0.maddr="0xd0000"
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

#
# 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:
#
# dgb: Digiboard PC/Xi and PC/Xe series driver (ALPHA QUALITY!)
# digi: Digiboard driver
# 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 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 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		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
# HOT1 Xilinx 6200 card (http://www.vcc.com/)
device		xrpu

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

# PCI bus Cards:
# --------------
#
# Cyclades Cyclom-Y PCI serial driver
device		cy
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"

#
# 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 Linux ABI emulation
#options 	COMPAT_LINUX

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


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

options 	ENABLE_ALART
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