xref: /linux/arch/arm/Kconfig (revision 8ae12a0d85987dc138f8c944cb78a92bf466cea0)

#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#

mainmenu "Linux Kernel Configuration"

config ARM
	bool
	default y
	help
	  The ARM series is a line of low-power-consumption RISC chip designs
	  licensed by ARM ltd and targeted at embedded applications and
	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
	  manufactured, but  legacy ARM-based PC hardware remains popular in
	  Europe.  There is an ARM Linux project with a web page at
	  <http://www.arm.linux.org.uk/>.

config MMU
	bool
	default y

config EISA
	bool
	---help---
	  The Extended Industry Standard Architecture (EISA) bus was
	  developed as an open alternative to the IBM MicroChannel bus.

	  The EISA bus provided some of the features of the IBM MicroChannel
	  bus while maintaining backward compatibility with cards made for
	  the older ISA bus.  The EISA bus saw limited use between 1988 and
	  1995 when it was made obsolete by the PCI bus.

	  Say Y here if you are building a kernel for an EISA-based machine.

	  Otherwise, say N.

config SBUS
	bool

config MCA
	bool
	help
	  MicroChannel Architecture is found in some IBM PS/2 machines and
	  laptops.  It is a bus system similar to PCI or ISA. See
	  <file:Documentation/mca.txt> (and especially the web page given
	  there) before attempting to build an MCA bus kernel.

config RWSEM_GENERIC_SPINLOCK
	bool
	default y

config RWSEM_XCHGADD_ALGORITHM
	bool

config GENERIC_CALIBRATE_DELAY
	bool
	default y

config GENERIC_BUST_SPINLOCK
	bool

config ARCH_MAY_HAVE_PC_FDC
	bool

config GENERIC_ISA_DMA
	bool

config FIQ
	bool

source "init/Kconfig"

menu "System Type"

choice
	prompt "ARM system type"
	default ARCH_RPC

config ARCH_CLPS7500
	bool "Cirrus-CL-PS7500FE"
	select TIMER_ACORN
	select ISA

config ARCH_CLPS711X
	bool "CLPS711x/EP721x-based"

config ARCH_CO285
	bool "Co-EBSA285"
	select FOOTBRIDGE
	select FOOTBRIDGE_ADDIN

config ARCH_EBSA110
	bool "EBSA-110"
	select ISA
	help
	  This is an evaluation board for the StrongARM processor available
	  from Digital. It has limited hardware on-board, including an onboard
	  Ethernet interface, two PCMCIA sockets, two serial ports and a
	  parallel port.

config ARCH_FOOTBRIDGE
	bool "FootBridge"
	select FOOTBRIDGE

config ARCH_INTEGRATOR
	bool "Integrator"
	select ARM_AMBA
	select ICST525

config ARCH_IOP3XX
	bool "IOP3xx-based"
	select PCI

config ARCH_IXP4XX
	bool "IXP4xx-based"
	select DMABOUNCE
	select PCI

config ARCH_IXP2000
	bool "IXP2400/2800-based"
	select PCI

config ARCH_L7200
	bool "LinkUp-L7200"
	select FIQ
	help
	  Say Y here if you intend to run this kernel on a LinkUp Systems
	  L7200 Software Development Board which uses an ARM720T processor.
	  Information on this board can be obtained at:

	  <http://www.linkupsys.com/>

	  If you have any questions or comments about the Linux kernel port
	  to this board, send e-mail to <sjhill@cotw.com>.

config ARCH_PXA
	bool "PXA2xx-based"

config ARCH_RPC
	bool "RiscPC"
	select ARCH_ACORN
	select FIQ
	select TIMER_ACORN
	select ARCH_MAY_HAVE_PC_FDC
	select ISA_DMA_API
	help
	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
	  CD-ROM interface, serial and parallel port, and the floppy drive.

config ARCH_SA1100
	bool "SA1100-based"
	select ISA
	select ARCH_DISCONTIGMEM_ENABLE

config ARCH_S3C2410
	bool "Samsung S3C2410"
	help
	  Samsung S3C2410X CPU based systems, such as the Simtec Electronics
	  BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
	  the Samsung SMDK2410 development board (and derviatives).

config ARCH_SHARK
	bool "Shark"
	select ISA
	select ISA_DMA
	select PCI

config ARCH_LH7A40X
	bool "Sharp LH7A40X"
	help
	  Say Y here for systems based on one of the Sharp LH7A40X
	  System on a Chip processors.  These CPUs include an ARM922T
	  core with a wide array of integrated devices for
	  hand-held and low-power applications.

config ARCH_OMAP
	bool "TI OMAP"

config ARCH_VERSATILE
	bool "Versatile"
	select ARM_AMBA
	select ICST307
	help
	  This enables support for ARM Ltd Versatile board.

config ARCH_REALVIEW
	bool "RealView"
	select ARM_AMBA
	select ICST307
	help
	  This enables support for ARM Ltd RealView boards.

config ARCH_IMX
	bool "IMX"

config ARCH_H720X
	bool "Hynix-HMS720x-based"
	select ISA_DMA_API
	help
	  This enables support for systems based on the Hynix HMS720x

config ARCH_AAEC2000
	bool "Agilent AAEC-2000 based"
	select ARM_AMBA
	help
	  This enables support for systems based on the Agilent AAEC-2000

config ARCH_AT91RM9200
	bool "AT91RM9200"
	help
	  Say Y here if you intend to run this kernel on an AT91RM9200-based
	  board.

endchoice

source "arch/arm/mach-clps711x/Kconfig"

source "arch/arm/mach-footbridge/Kconfig"

source "arch/arm/mach-integrator/Kconfig"

source "arch/arm/mach-iop3xx/Kconfig"

source "arch/arm/mach-ixp4xx/Kconfig"

source "arch/arm/mach-ixp2000/Kconfig"

source "arch/arm/mach-pxa/Kconfig"

source "arch/arm/mach-sa1100/Kconfig"

source "arch/arm/plat-omap/Kconfig"

source "arch/arm/mach-omap1/Kconfig"

source "arch/arm/mach-omap2/Kconfig"

source "arch/arm/mach-s3c2410/Kconfig"

source "arch/arm/mach-lh7a40x/Kconfig"

source "arch/arm/mach-imx/Kconfig"

source "arch/arm/mach-h720x/Kconfig"

source "arch/arm/mach-versatile/Kconfig"

source "arch/arm/mach-aaec2000/Kconfig"

source "arch/arm/mach-realview/Kconfig"

source "arch/arm/mach-at91rm9200/Kconfig"

# Definitions to make life easier
config ARCH_ACORN
	bool

source arch/arm/mm/Kconfig

#  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
config XSCALE_PMU
	bool
	depends on CPU_XSCALE && !XSCALE_PMU_TIMER
	default y

endmenu

source "arch/arm/common/Kconfig"

config FORCE_MAX_ZONEORDER
	int
	depends on SA1111
	default "9"

menu "Bus support"

config ARM_AMBA
	bool

config ISA
	bool
	help
	  Find out whether you have ISA slots on your motherboard.  ISA is the
	  name of a bus system, i.e. the way the CPU talks to the other stuff
	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
	  newer boards don't support it.  If you have ISA, say Y, otherwise N.

# Select ISA DMA controller support
config ISA_DMA
	bool
	select ISA_DMA_API

# Select ISA DMA interface
config ISA_DMA_API
	bool

config PCI
	bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB
	help
	  Find out whether you have a PCI motherboard. PCI is the name of a
	  bus system, i.e. the way the CPU talks to the other stuff inside
	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
	  VESA. If you have PCI, say Y, otherwise N.

	  The PCI-HOWTO, available from
	  <http://www.tldp.org/docs.html#howto>, contains valuable
	  information about which PCI hardware does work under Linux and which
	  doesn't.

# Select the host bridge type
config PCI_HOST_VIA82C505
	bool
	depends on PCI && ARCH_SHARK
	default y

source "drivers/pci/Kconfig"

source "drivers/pcmcia/Kconfig"

endmenu

menu "Kernel Features"

config SMP
	bool "Symmetric Multi-Processing (EXPERIMENTAL)"
	depends on EXPERIMENTAL && REALVIEW_MPCORE
	help
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, like most personal computers, say N. If
	  you have a system with more than one CPU, say Y.

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on many, but not all, single
	  processor machines. On a single processor machine, the kernel will
	  run faster if you say N here.

	  See also the <file:Documentation/smp.txt>,
	  <file:Documentation/i386/IO-APIC.txt>,
	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
	  <http://www.linuxdoc.org/docs.html#howto>.

	  If you don't know what to do here, say N.

config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "4"

config HOTPLUG_CPU
	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
	depends on SMP && HOTPLUG && EXPERIMENTAL
	help
	  Say Y here to experiment with turning CPUs off and on.  CPUs
	  can be controlled through /sys/devices/system/cpu.

config LOCAL_TIMERS
	bool "Use local timer interrupts"
	depends on SMP && REALVIEW_MPCORE
	default y
	help
	  Enable support for local timers on SMP platforms, rather then the
	  legacy IPI broadcast method.  Local timers allows the system
	  accounting to be spread across the timer interval, preventing a
	  "thundering herd" at every timer tick.

config PREEMPT
	bool "Preemptible Kernel (EXPERIMENTAL)"
	depends on EXPERIMENTAL
	help
	  This option reduces the latency of the kernel when reacting to
	  real-time or interactive events by allowing a low priority process to
	  be preempted even if it is in kernel mode executing a system call.
	  This allows applications to run more reliably even when the system is
	  under load.

	  Say Y here if you are building a kernel for a desktop, embedded
	  or real-time system.  Say N if you are unsure.

config NO_IDLE_HZ
	bool "Dynamic tick timer"
	help
	  Select this option if you want to disable continuous timer ticks
	  and have them programmed to occur as required. This option saves
	  power as the system can remain in idle state for longer.

	  By default dynamic tick is disabled during the boot, and can be
	  manually enabled with:

	    echo 1 > /sys/devices/system/timer/timer0/dyn_tick

	  Alternatively, if you want dynamic tick automatically enabled
	  during boot, pass "dyntick=enable" via the kernel command string.

	  Please note that dynamic tick may affect the accuracy of
	  timekeeping on some platforms depending on the implementation.
	  Currently at least OMAP, PXA2xx and SA11x0 platforms are known
	  to have accurate timekeeping with dynamic tick.

config ARCH_DISCONTIGMEM_ENABLE
	bool
	default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
	help
	  Say Y to support efficient handling of discontiguous physical memory,
	  for architectures which are either NUMA (Non-Uniform Memory Access)
	  or have huge holes in the physical address space for other reasons.
	  See <file:Documentation/vm/numa> for more.

source "mm/Kconfig"

config LEDS
	bool "Timer and CPU usage LEDs"
	depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
		   ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
		   ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
		   ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
		   ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
		   ARCH_AT91RM9200
	help
	  If you say Y here, the LEDs on your machine will be used
	  to provide useful information about your current system status.

	  If you are compiling a kernel for a NetWinder or EBSA-285, you will
	  be able to select which LEDs are active using the options below. If
	  you are compiling a kernel for the EBSA-110 or the LART however, the
	  red LED will simply flash regularly to indicate that the system is
	  still functional. It is safe to say Y here if you have a CATS
	  system, but the driver will do nothing.

config LEDS_TIMER
	bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
			    MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
	depends on LEDS
	default y if ARCH_EBSA110
	help
	  If you say Y here, one of the system LEDs (the green one on the
	  NetWinder, the amber one on the EBSA285, or the red one on the LART)
	  will flash regularly to indicate that the system is still
	  operational. This is mainly useful to kernel hackers who are
	  debugging unstable kernels.

	  The LART uses the same LED for both Timer LED and CPU usage LED
	  functions. You may choose to use both, but the Timer LED function
	  will overrule the CPU usage LED.

config LEDS_CPU
	bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
			!ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
	depends on LEDS
	help
	  If you say Y here, the red LED will be used to give a good real
	  time indication of CPU usage, by lighting whenever the idle task
	  is not currently executing.

	  The LART uses the same LED for both Timer LED and CPU usage LED
	  functions. You may choose to use both, but the Timer LED function
	  will overrule the CPU usage LED.

config ALIGNMENT_TRAP
	bool
	default y if !ARCH_EBSA110
	help
	  ARM processors can not fetch/store information which is not
	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
	  address divisible by 4. On 32-bit ARM processors, these non-aligned
	  fetch/store instructions will be emulated in software if you say
	  here, which has a severe performance impact. This is necessary for
	  correct operation of some network protocols. With an IP-only
	  configuration it is safe to say N, otherwise say Y.

endmenu

menu "Boot options"

# Compressed boot loader in ROM.  Yes, we really want to ask about
# TEXT and BSS so we preserve their values in the config files.
config ZBOOT_ROM_TEXT
	hex "Compressed ROM boot loader base address"
	default "0"
	help
	  The physical address at which the ROM-able zImage is to be
	  placed in the target.  Platforms which normally make use of
	  ROM-able zImage formats normally set this to a suitable
	  value in their defconfig file.

	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM_BSS
	hex "Compressed ROM boot loader BSS address"
	default "0"
	help
	  The base address of 64KiB of read/write memory in the target
	  for the ROM-able zImage, which must be available while the
	  decompressor is running.  Platforms which normally make use of
	  ROM-able zImage formats normally set this to a suitable
	  value in their defconfig file.

	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM
	bool "Compressed boot loader in ROM/flash"
	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
	help
	  Say Y here if you intend to execute your compressed kernel image
	  (zImage) directly from ROM or flash.  If unsure, say N.

config CMDLINE
	string "Default kernel command string"
	default ""
	help
	  On some architectures (EBSA110 and CATS), there is currently no way
	  for the boot loader to pass arguments to the kernel. For these
	  architectures, you should supply some command-line options at build
	  time by entering them here. As a minimum, you should specify the
	  memory size and the root device (e.g., mem=64M root=/dev/nfs).

config XIP_KERNEL
	bool "Kernel Execute-In-Place from ROM"
	depends on !ZBOOT_ROM
	help
	  Execute-In-Place allows the kernel to run from non-volatile storage
	  directly addressable by the CPU, such as NOR flash. This saves RAM
	  space since the text section of the kernel is not loaded from flash
	  to RAM.  Read-write sections, such as the data section and stack,
	  are still copied to RAM.  The XIP kernel is not compressed since
	  it has to run directly from flash, so it will take more space to
	  store it.  The flash address used to link the kernel object files,
	  and for storing it, is configuration dependent. Therefore, if you
	  say Y here, you must know the proper physical address where to
	  store the kernel image depending on your own flash memory usage.

	  Also note that the make target becomes "make xipImage" rather than
	  "make zImage" or "make Image".  The final kernel binary to put in
	  ROM memory will be arch/arm/boot/xipImage.

	  If unsure, say N.

config XIP_PHYS_ADDR
	hex "XIP Kernel Physical Location"
	depends on XIP_KERNEL
	default "0x00080000"
	help
	  This is the physical address in your flash memory the kernel will
	  be linked for and stored to.  This address is dependent on your
	  own flash usage.

endmenu

if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)

menu "CPU Frequency scaling"

source "drivers/cpufreq/Kconfig"

config CPU_FREQ_SA1100
	bool
	depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
	default y

config CPU_FREQ_SA1110
	bool
	depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
	default y

config CPU_FREQ_INTEGRATOR
	tristate "CPUfreq driver for ARM Integrator CPUs"
	depends on ARCH_INTEGRATOR && CPU_FREQ
	default y
	help
	  This enables the CPUfreq driver for ARM Integrator CPUs.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say Y.

endmenu

endif

menu "Floating point emulation"

comment "At least one emulation must be selected"

config FPE_NWFPE
	bool "NWFPE math emulation"
	---help---
	  Say Y to include the NWFPE floating point emulator in the kernel.
	  This is necessary to run most binaries. Linux does not currently
	  support floating point hardware so you need to say Y here even if
	  your machine has an FPA or floating point co-processor podule.

	  You may say N here if you are going to load the Acorn FPEmulator
	  early in the bootup.

config FPE_NWFPE_XP
	bool "Support extended precision"
	depends on FPE_NWFPE
	help
	  Say Y to include 80-bit support in the kernel floating-point
	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
	  Note that gcc does not generate 80-bit operations by default,
	  so in most cases this option only enlarges the size of the
	  floating point emulator without any good reason.

	  You almost surely want to say N here.

config FPE_FASTFPE
	bool "FastFPE math emulation (EXPERIMENTAL)"
	depends on !CPU_32v3 && EXPERIMENTAL
	---help---
	  Say Y here to include the FAST floating point emulator in the kernel.
	  This is an experimental much faster emulator which now also has full
	  precision for the mantissa.  It does not support any exceptions.
	  It is very simple, and approximately 3-6 times faster than NWFPE.

	  It should be sufficient for most programs.  It may be not suitable
	  for scientific calculations, but you have to check this for yourself.
	  If you do not feel you need a faster FP emulation you should better
	  choose NWFPE.

config VFP
	bool "VFP-format floating point maths"
	depends on CPU_V6 || CPU_ARM926T
	help
	  Say Y to include VFP support code in the kernel. This is needed
	  if your hardware includes a VFP unit.

	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
	  release notes and additional status information.

	  Say N if your target does not have VFP hardware.

endmenu

menu "Userspace binary formats"

source "fs/Kconfig.binfmt"

config ARTHUR
	tristate "RISC OS personality"
	help
	  Say Y here to include the kernel code necessary if you want to run
	  Acorn RISC OS/Arthur binaries under Linux. This code is still very
	  experimental; if this sounds frightening, say N and sleep in peace.
	  You can also say M here to compile this support as a module (which
	  will be called arthur).

endmenu

menu "Power management options"

source "kernel/power/Kconfig"

config APM
	tristate "Advanced Power Management Emulation"
	---help---
	  APM is a BIOS specification for saving power using several different
	  techniques. This is mostly useful for battery powered laptops with
	  APM compliant BIOSes. If you say Y here, the system time will be
	  reset after a RESUME operation, the /proc/apm device will provide
	  battery status information, and user-space programs will receive
	  notification of APM "events" (e.g. battery status change).

	  In order to use APM, you will need supporting software. For location
	  and more information, read <file:Documentation/pm.txt> and the
	  Battery Powered Linux mini-HOWTO, available from
	  <http://www.tldp.org/docs.html#howto>.

	  This driver does not spin down disk drives (see the hdparm(8)
	  manpage ("man 8 hdparm") for that), and it doesn't turn off
	  VESA-compliant "green" monitors.

	  Generally, if you don't have a battery in your machine, there isn't
	  much point in using this driver and you should say N. If you get
	  random kernel OOPSes or reboots that don't seem to be related to
	  anything, try disabling/enabling this option (or disabling/enabling
	  APM in your BIOS).

endmenu

source "net/Kconfig"

menu "Device Drivers"

source "drivers/base/Kconfig"

source "drivers/connector/Kconfig"

if ALIGNMENT_TRAP
source "drivers/mtd/Kconfig"
endif

source "drivers/parport/Kconfig"

source "drivers/pnp/Kconfig"

source "drivers/block/Kconfig"

source "drivers/acorn/block/Kconfig"

if PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \
	|| ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
	|| ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
source "drivers/ide/Kconfig"
endif

source "drivers/scsi/Kconfig"

source "drivers/md/Kconfig"

source "drivers/message/fusion/Kconfig"

source "drivers/ieee1394/Kconfig"

source "drivers/message/i2o/Kconfig"

source "drivers/net/Kconfig"

source "drivers/isdn/Kconfig"

# input before char - char/joystick depends on it. As does USB.

source "drivers/input/Kconfig"

source "drivers/char/Kconfig"

source "drivers/i2c/Kconfig"

source "drivers/spi/Kconfig"

source "drivers/hwmon/Kconfig"

#source "drivers/l3/Kconfig"

source "drivers/misc/Kconfig"

source "drivers/mfd/Kconfig"

source "drivers/media/Kconfig"

source "drivers/video/Kconfig"

source "sound/Kconfig"

source "drivers/usb/Kconfig"

source "drivers/mmc/Kconfig"

endmenu

source "fs/Kconfig"

source "arch/arm/oprofile/Kconfig"

source "arch/arm/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"