2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
12 The ARM series is a line of low-power-consumption RISC chip designs
13 licensed by ARM ltd and targeted at embedded applications and
14 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
15 manufactured, but legacy ARM-based PC hardware remains popular in
16 Europe. There is an ARM Linux project with a web page at
17 <http://www.arm.linux.org.uk/>.
26 The Extended Industry Standard Architecture (EISA) bus was
27 developed as an open alternative to the IBM MicroChannel bus.
29 The EISA bus provided some of the features of the IBM MicroChannel
30 bus while maintaining backward compatibility with cards made for
31 the older ISA bus. The EISA bus saw limited use between 1988 and
32 1995 when it was made obsolete by the PCI bus.
34 Say Y here if you are building a kernel for an EISA-based machine.
44 MicroChannel Architecture is found in some IBM PS/2 machines and
45 laptops. It is a bus system similar to PCI or ISA. See
46 <file:Documentation/mca.txt> (and especially the web page given
47 there) before attempting to build an MCA bus kernel.
49 config RWSEM_GENERIC_SPINLOCK
53 config RWSEM_XCHGADD_ALGORITHM
56 config GENERIC_CALIBRATE_DELAY
60 config GENERIC_BUST_SPINLOCK
63 config ARCH_MAY_HAVE_PC_FDC
66 config GENERIC_ISA_DMA
77 prompt "ARM system type"
81 bool "Cirrus-CL-PS7500FE"
86 bool "CLPS711x/EP721x-based"
91 select FOOTBRIDGE_ADDIN
97 This is an evaluation board for the StrongARM processor available
98 from Digital. It has limited hardware on-board, including an onboard
99 Ethernet interface, two PCMCIA sockets, two serial ports and a
102 config ARCH_FOOTBRIDGE
106 config ARCH_INTEGRATOR
121 bool "IXP2400/2800-based"
128 Say Y here if you intend to run this kernel on a LinkUp Systems
129 L7200 Software Development Board which uses an ARM720T processor.
130 Information on this board can be obtained at:
132 <http://www.linkupsys.com/>
134 If you have any questions or comments about the Linux kernel port
135 to this board, send e-mail to <sjhill@cotw.com>.
145 select ARCH_MAY_HAVE_PC_FDC
148 On the Acorn Risc-PC, Linux can support the internal IDE disk and
149 CD-ROM interface, serial and parallel port, and the floppy drive.
154 select ARCH_DISCONTIGMEM_ENABLE
157 bool "Samsung S3C2410"
159 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
160 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
161 the Samsung SMDK2410 development board (and derviatives).
172 Say Y here for systems based on one of the Sharp LH7A40X
173 System on a Chip processors. These CPUs include an ARM922T
174 core with a wide array of integrated devices for
175 hand-held and low-power applications.
180 config ARCH_VERSATILE
185 This enables support for ARM Ltd Versatile board.
192 This enables support for ARM Ltd RealView boards.
198 bool "Hynix-HMS720x-based"
201 This enables support for systems based on the Hynix HMS720x
204 bool "Agilent AAEC-2000 based"
207 This enables support for systems based on the Agilent AAEC-2000
209 config ARCH_AT91RM9200
212 Say Y here if you intend to run this kernel on an AT91RM9200-based
217 source "arch/arm/mach-clps711x/Kconfig"
219 source "arch/arm/mach-footbridge/Kconfig"
221 source "arch/arm/mach-integrator/Kconfig"
223 source "arch/arm/mach-iop3xx/Kconfig"
225 source "arch/arm/mach-ixp4xx/Kconfig"
227 source "arch/arm/mach-ixp2000/Kconfig"
229 source "arch/arm/mach-pxa/Kconfig"
231 source "arch/arm/mach-sa1100/Kconfig"
233 source "arch/arm/plat-omap/Kconfig"
235 source "arch/arm/mach-omap1/Kconfig"
237 source "arch/arm/mach-omap2/Kconfig"
239 source "arch/arm/mach-s3c2410/Kconfig"
241 source "arch/arm/mach-lh7a40x/Kconfig"
243 source "arch/arm/mach-imx/Kconfig"
245 source "arch/arm/mach-h720x/Kconfig"
247 source "arch/arm/mach-versatile/Kconfig"
249 source "arch/arm/mach-aaec2000/Kconfig"
251 source "arch/arm/mach-realview/Kconfig"
253 source "arch/arm/mach-at91rm9200/Kconfig"
255 # Definitions to make life easier
259 source arch/arm/mm/Kconfig
261 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
264 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
269 source "arch/arm/common/Kconfig"
271 config FORCE_MAX_ZONEORDER
284 Find out whether you have ISA slots on your motherboard. ISA is the
285 name of a bus system, i.e. the way the CPU talks to the other stuff
286 inside your box. Other bus systems are PCI, EISA, MicroChannel
287 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
288 newer boards don't support it. If you have ISA, say Y, otherwise N.
290 # Select ISA DMA controller support
295 # Select ISA DMA interface
300 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB
302 Find out whether you have a PCI motherboard. PCI is the name of a
303 bus system, i.e. the way the CPU talks to the other stuff inside
304 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
305 VESA. If you have PCI, say Y, otherwise N.
307 The PCI-HOWTO, available from
308 <http://www.tldp.org/docs.html#howto>, contains valuable
309 information about which PCI hardware does work under Linux and which
312 # Select the host bridge type
313 config PCI_HOST_VIA82C505
315 depends on PCI && ARCH_SHARK
318 source "drivers/pci/Kconfig"
320 source "drivers/pcmcia/Kconfig"
324 menu "Kernel Features"
327 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
328 depends on EXPERIMENTAL && REALVIEW_MPCORE
330 This enables support for systems with more than one CPU. If you have
331 a system with only one CPU, like most personal computers, say N. If
332 you have a system with more than one CPU, say Y.
334 If you say N here, the kernel will run on single and multiprocessor
335 machines, but will use only one CPU of a multiprocessor machine. If
336 you say Y here, the kernel will run on many, but not all, single
337 processor machines. On a single processor machine, the kernel will
338 run faster if you say N here.
340 See also the <file:Documentation/smp.txt>,
341 <file:Documentation/i386/IO-APIC.txt>,
342 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
343 <http://www.linuxdoc.org/docs.html#howto>.
345 If you don't know what to do here, say N.
348 int "Maximum number of CPUs (2-32)"
354 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
355 depends on SMP && HOTPLUG && EXPERIMENTAL
357 Say Y here to experiment with turning CPUs off and on. CPUs
358 can be controlled through /sys/devices/system/cpu.
361 bool "Use local timer interrupts"
362 depends on SMP && REALVIEW_MPCORE
365 Enable support for local timers on SMP platforms, rather then the
366 legacy IPI broadcast method. Local timers allows the system
367 accounting to be spread across the timer interval, preventing a
368 "thundering herd" at every timer tick.
371 bool "Preemptible Kernel (EXPERIMENTAL)"
372 depends on EXPERIMENTAL
374 This option reduces the latency of the kernel when reacting to
375 real-time or interactive events by allowing a low priority process to
376 be preempted even if it is in kernel mode executing a system call.
377 This allows applications to run more reliably even when the system is
380 Say Y here if you are building a kernel for a desktop, embedded
381 or real-time system. Say N if you are unsure.
384 bool "Dynamic tick timer"
386 Select this option if you want to disable continuous timer ticks
387 and have them programmed to occur as required. This option saves
388 power as the system can remain in idle state for longer.
390 By default dynamic tick is disabled during the boot, and can be
391 manually enabled with:
393 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
395 Alternatively, if you want dynamic tick automatically enabled
396 during boot, pass "dyntick=enable" via the kernel command string.
398 Please note that dynamic tick may affect the accuracy of
399 timekeeping on some platforms depending on the implementation.
400 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
401 to have accurate timekeeping with dynamic tick.
403 config ARCH_DISCONTIGMEM_ENABLE
405 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
407 Say Y to support efficient handling of discontiguous physical memory,
408 for architectures which are either NUMA (Non-Uniform Memory Access)
409 or have huge holes in the physical address space for other reasons.
410 See <file:Documentation/vm/numa> for more.
415 bool "Timer and CPU usage LEDs"
416 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
417 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
418 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
419 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
420 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
423 If you say Y here, the LEDs on your machine will be used
424 to provide useful information about your current system status.
426 If you are compiling a kernel for a NetWinder or EBSA-285, you will
427 be able to select which LEDs are active using the options below. If
428 you are compiling a kernel for the EBSA-110 or the LART however, the
429 red LED will simply flash regularly to indicate that the system is
430 still functional. It is safe to say Y here if you have a CATS
431 system, but the driver will do nothing.
434 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
435 MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
437 default y if ARCH_EBSA110
439 If you say Y here, one of the system LEDs (the green one on the
440 NetWinder, the amber one on the EBSA285, or the red one on the LART)
441 will flash regularly to indicate that the system is still
442 operational. This is mainly useful to kernel hackers who are
443 debugging unstable kernels.
445 The LART uses the same LED for both Timer LED and CPU usage LED
446 functions. You may choose to use both, but the Timer LED function
447 will overrule the CPU usage LED.
450 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
451 !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
454 If you say Y here, the red LED will be used to give a good real
455 time indication of CPU usage, by lighting whenever the idle task
456 is not currently executing.
458 The LART uses the same LED for both Timer LED and CPU usage LED
459 functions. You may choose to use both, but the Timer LED function
460 will overrule the CPU usage LED.
462 config ALIGNMENT_TRAP
464 default y if !ARCH_EBSA110
466 ARM processors can not fetch/store information which is not
467 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
468 address divisible by 4. On 32-bit ARM processors, these non-aligned
469 fetch/store instructions will be emulated in software if you say
470 here, which has a severe performance impact. This is necessary for
471 correct operation of some network protocols. With an IP-only
472 configuration it is safe to say N, otherwise say Y.
478 # Compressed boot loader in ROM. Yes, we really want to ask about
479 # TEXT and BSS so we preserve their values in the config files.
480 config ZBOOT_ROM_TEXT
481 hex "Compressed ROM boot loader base address"
484 The physical address at which the ROM-able zImage is to be
485 placed in the target. Platforms which normally make use of
486 ROM-able zImage formats normally set this to a suitable
487 value in their defconfig file.
489 If ZBOOT_ROM is not enabled, this has no effect.
492 hex "Compressed ROM boot loader BSS address"
495 The base address of 64KiB of read/write memory in the target
496 for the ROM-able zImage, which must be available while the
497 decompressor is running. Platforms which normally make use of
498 ROM-able zImage formats normally set this to a suitable
499 value in their defconfig file.
501 If ZBOOT_ROM is not enabled, this has no effect.
504 bool "Compressed boot loader in ROM/flash"
505 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
507 Say Y here if you intend to execute your compressed kernel image
508 (zImage) directly from ROM or flash. If unsure, say N.
511 string "Default kernel command string"
514 On some architectures (EBSA110 and CATS), there is currently no way
515 for the boot loader to pass arguments to the kernel. For these
516 architectures, you should supply some command-line options at build
517 time by entering them here. As a minimum, you should specify the
518 memory size and the root device (e.g., mem=64M root=/dev/nfs).
521 bool "Kernel Execute-In-Place from ROM"
522 depends on !ZBOOT_ROM
524 Execute-In-Place allows the kernel to run from non-volatile storage
525 directly addressable by the CPU, such as NOR flash. This saves RAM
526 space since the text section of the kernel is not loaded from flash
527 to RAM. Read-write sections, such as the data section and stack,
528 are still copied to RAM. The XIP kernel is not compressed since
529 it has to run directly from flash, so it will take more space to
530 store it. The flash address used to link the kernel object files,
531 and for storing it, is configuration dependent. Therefore, if you
532 say Y here, you must know the proper physical address where to
533 store the kernel image depending on your own flash memory usage.
535 Also note that the make target becomes "make xipImage" rather than
536 "make zImage" or "make Image". The final kernel binary to put in
537 ROM memory will be arch/arm/boot/xipImage.
542 hex "XIP Kernel Physical Location"
543 depends on XIP_KERNEL
546 This is the physical address in your flash memory the kernel will
547 be linked for and stored to. This address is dependent on your
552 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)
554 menu "CPU Frequency scaling"
556 source "drivers/cpufreq/Kconfig"
558 config CPU_FREQ_SA1100
560 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
563 config CPU_FREQ_SA1110
565 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
568 config CPU_FREQ_INTEGRATOR
569 tristate "CPUfreq driver for ARM Integrator CPUs"
570 depends on ARCH_INTEGRATOR && CPU_FREQ
573 This enables the CPUfreq driver for ARM Integrator CPUs.
575 For details, take a look at <file:Documentation/cpu-freq>.
583 menu "Floating point emulation"
585 comment "At least one emulation must be selected"
588 bool "NWFPE math emulation"
590 Say Y to include the NWFPE floating point emulator in the kernel.
591 This is necessary to run most binaries. Linux does not currently
592 support floating point hardware so you need to say Y here even if
593 your machine has an FPA or floating point co-processor podule.
595 You may say N here if you are going to load the Acorn FPEmulator
599 bool "Support extended precision"
602 Say Y to include 80-bit support in the kernel floating-point
603 emulator. Otherwise, only 32 and 64-bit support is compiled in.
604 Note that gcc does not generate 80-bit operations by default,
605 so in most cases this option only enlarges the size of the
606 floating point emulator without any good reason.
608 You almost surely want to say N here.
611 bool "FastFPE math emulation (EXPERIMENTAL)"
612 depends on !CPU_32v3 && EXPERIMENTAL
614 Say Y here to include the FAST floating point emulator in the kernel.
615 This is an experimental much faster emulator which now also has full
616 precision for the mantissa. It does not support any exceptions.
617 It is very simple, and approximately 3-6 times faster than NWFPE.
619 It should be sufficient for most programs. It may be not suitable
620 for scientific calculations, but you have to check this for yourself.
621 If you do not feel you need a faster FP emulation you should better
625 bool "VFP-format floating point maths"
626 depends on CPU_V6 || CPU_ARM926T
628 Say Y to include VFP support code in the kernel. This is needed
629 if your hardware includes a VFP unit.
631 Please see <file:Documentation/arm/VFP/release-notes.txt> for
632 release notes and additional status information.
634 Say N if your target does not have VFP hardware.
638 menu "Userspace binary formats"
640 source "fs/Kconfig.binfmt"
643 tristate "RISC OS personality"
645 Say Y here to include the kernel code necessary if you want to run
646 Acorn RISC OS/Arthur binaries under Linux. This code is still very
647 experimental; if this sounds frightening, say N and sleep in peace.
648 You can also say M here to compile this support as a module (which
649 will be called arthur).
653 menu "Power management options"
655 source "kernel/power/Kconfig"
658 tristate "Advanced Power Management Emulation"
660 APM is a BIOS specification for saving power using several different
661 techniques. This is mostly useful for battery powered laptops with
662 APM compliant BIOSes. If you say Y here, the system time will be
663 reset after a RESUME operation, the /proc/apm device will provide
664 battery status information, and user-space programs will receive
665 notification of APM "events" (e.g. battery status change).
667 In order to use APM, you will need supporting software. For location
668 and more information, read <file:Documentation/pm.txt> and the
669 Battery Powered Linux mini-HOWTO, available from
670 <http://www.tldp.org/docs.html#howto>.
672 This driver does not spin down disk drives (see the hdparm(8)
673 manpage ("man 8 hdparm") for that), and it doesn't turn off
674 VESA-compliant "green" monitors.
676 Generally, if you don't have a battery in your machine, there isn't
677 much point in using this driver and you should say N. If you get
678 random kernel OOPSes or reboots that don't seem to be related to
679 anything, try disabling/enabling this option (or disabling/enabling
686 menu "Device Drivers"
688 source "drivers/base/Kconfig"
690 source "drivers/connector/Kconfig"
693 source "drivers/mtd/Kconfig"
696 source "drivers/parport/Kconfig"
698 source "drivers/pnp/Kconfig"
700 source "drivers/block/Kconfig"
702 source "drivers/acorn/block/Kconfig"
704 if PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \
705 || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
706 || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
707 source "drivers/ide/Kconfig"
710 source "drivers/scsi/Kconfig"
712 source "drivers/md/Kconfig"
714 source "drivers/message/fusion/Kconfig"
716 source "drivers/ieee1394/Kconfig"
718 source "drivers/message/i2o/Kconfig"
720 source "drivers/net/Kconfig"
722 source "drivers/isdn/Kconfig"
724 # input before char - char/joystick depends on it. As does USB.
726 source "drivers/input/Kconfig"
728 source "drivers/char/Kconfig"
730 source "drivers/i2c/Kconfig"
732 source "drivers/spi/Kconfig"
734 source "drivers/hwmon/Kconfig"
736 #source "drivers/l3/Kconfig"
738 source "drivers/misc/Kconfig"
740 source "drivers/mfd/Kconfig"
742 source "drivers/media/Kconfig"
744 source "drivers/video/Kconfig"
746 source "sound/Kconfig"
748 source "drivers/usb/Kconfig"
750 source "drivers/mmc/Kconfig"
756 source "arch/arm/oprofile/Kconfig"
758 source "arch/arm/Kconfig.debug"
760 source "security/Kconfig"
762 source "crypto/Kconfig"