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.
53 config RWSEM_GENERIC_SPINLOCK
57 config RWSEM_XCHGADD_ALGORITHM
60 config GENERIC_CALIBRATE_DELAY
64 config GENERIC_BUST_SPINLOCK
67 config GENERIC_ISA_DMA
82 prompt "ARM system type"
86 bool "Cirrus-CL-PS7500FE"
91 bool "CLPS711x/EP721x-based"
96 select FOOTBRIDGE_ADDIN
102 This is an evaluation board for the StrongARM processor available
103 from Digital. It has limited hardware on-board, including an onboard
104 Ethernet interface, two PCMCIA sockets, two serial ports and a
110 This enables support for Altera's Excalibur XA10 development board.
111 If you would like to build your kernel to run on one of these boards
112 then you must say 'Y' here. Otherwise say 'N'
114 config ARCH_FOOTBRIDGE
118 config ARCH_INTEGRATOR
133 bool "IXP2400/2800-based"
140 Say Y here if you intend to run this kernel on a LinkUp Systems
141 L7200 Software Development Board which uses an ARM720T processor.
142 Information on this board can be obtained at:
144 <http://www.linkupsys.com/>
146 If you have any questions or comments about the Linux kernel port
147 to this board, send e-mail to <sjhill@cotw.com>.
158 On the Acorn Risc-PC, Linux can support the internal IDE disk and
159 CD-ROM interface, serial and parallel port, and the floppy drive.
167 bool "Samsung S3C2410"
169 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
170 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
171 the Samsung SMDK2410 development board (and derviatives).
182 Say Y here for systems based on one of the Sharp LH7A40X
183 System on a Chip processors. These CPUs include an ARM922T
184 core with a wide array of integrated devices for
185 hand-held and low-power applications.
190 config ARCH_VERSATILE
195 This enables support for ARM Ltd Versatile board.
201 bool "Hynix-HMS720x-based"
203 This enables support for systems based on the Hynix HMS720x
207 source "arch/arm/mach-clps711x/Kconfig"
209 source "arch/arm/mach-epxa10db/Kconfig"
211 source "arch/arm/mach-footbridge/Kconfig"
213 source "arch/arm/mach-integrator/Kconfig"
215 source "arch/arm/mach-iop3xx/Kconfig"
217 source "arch/arm/mach-ixp4xx/Kconfig"
219 source "arch/arm/mach-ixp2000/Kconfig"
221 source "arch/arm/mach-pxa/Kconfig"
223 source "arch/arm/mach-sa1100/Kconfig"
225 source "arch/arm/mach-omap/Kconfig"
227 source "arch/arm/mach-s3c2410/Kconfig"
229 source "arch/arm/mach-lh7a40x/Kconfig"
231 source "arch/arm/mach-imx/Kconfig"
233 source "arch/arm/mach-h720x/Kconfig"
235 source "arch/arm/mach-versatile/Kconfig"
237 # Definitions to make life easier
241 source arch/arm/mm/Kconfig
243 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
246 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
251 source "arch/arm/common/Kconfig"
253 config FORCE_MAX_ZONEORDER
266 Find out whether you have ISA slots on your motherboard. ISA is the
267 name of a bus system, i.e. the way the CPU talks to the other stuff
268 inside your box. Other bus systems are PCI, EISA, MicroChannel
269 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
270 newer boards don't support it. If you have ISA, say Y, otherwise N.
280 bool "PCI support" if ARCH_INTEGRATOR_AP
282 Find out whether you have a PCI motherboard. PCI is the name of a
283 bus system, i.e. the way the CPU talks to the other stuff inside
284 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
285 VESA. If you have PCI, say Y, otherwise N.
287 The PCI-HOWTO, available from
288 <http://www.tldp.org/docs.html#howto>, contains valuable
289 information about which PCI hardware does work under Linux and which
292 # Select the host bridge type
293 config PCI_HOST_VIA82C505
295 depends on PCI && ARCH_SHARK
298 source "drivers/pci/Kconfig"
300 source "drivers/pcmcia/Kconfig"
304 menu "Kernel Features"
307 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
308 depends on EXPERIMENTAL #&& n
310 This enables support for systems with more than one CPU. If you have
311 a system with only one CPU, like most personal computers, say N. If
312 you have a system with more than one CPU, say Y.
314 If you say N here, the kernel will run on single and multiprocessor
315 machines, but will use only one CPU of a multiprocessor machine. If
316 you say Y here, the kernel will run on many, but not all, single
317 processor machines. On a single processor machine, the kernel will
318 run faster if you say N here.
320 See also the <file:Documentation/smp.tex>,
321 <file:Documentation/smp.txt>, <file:Documentation/i386/IO-APIC.txt>,
322 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
323 <http://www.linuxdoc.org/docs.html#howto>.
325 If you don't know what to do here, say N.
328 int "Maximum number of CPUs (2-32)"
334 bool "Preemptible Kernel (EXPERIMENTAL)"
335 depends on EXPERIMENTAL
337 This option reduces the latency of the kernel when reacting to
338 real-time or interactive events by allowing a low priority process to
339 be preempted even if it is in kernel mode executing a system call.
340 This allows applications to run more reliably even when the system is
343 Say Y here if you are building a kernel for a desktop, embedded
344 or real-time system. Say N if you are unsure.
348 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
350 Say Y to support efficient handling of discontiguous physical memory,
351 for architectures which are either NUMA (Non-Uniform Memory Access)
352 or have huge holes in the physical address space for other reasons.
353 See <file:Documentation/vm/numa> for more.
356 bool "Timer and CPU usage LEDs"
357 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
358 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
359 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
360 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
361 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE
363 If you say Y here, the LEDs on your machine will be used
364 to provide useful information about your current system status.
366 If you are compiling a kernel for a NetWinder or EBSA-285, you will
367 be able to select which LEDs are active using the options below. If
368 you are compiling a kernel for the EBSA-110 or the LART however, the
369 red LED will simply flash regularly to indicate that the system is
370 still functional. It is safe to say Y here if you have a CATS
371 system, but the driver will do nothing.
374 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
375 MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
377 default y if ARCH_EBSA110
379 If you say Y here, one of the system LEDs (the green one on the
380 NetWinder, the amber one on the EBSA285, or the red one on the LART)
381 will flash regularly to indicate that the system is still
382 operational. This is mainly useful to kernel hackers who are
383 debugging unstable kernels.
385 The LART uses the same LED for both Timer LED and CPU usage LED
386 functions. You may choose to use both, but the Timer LED function
387 will overrule the CPU usage LED.
390 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
391 !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
394 If you say Y here, the red LED will be used to give a good real
395 time indication of CPU usage, by lighting whenever the idle task
396 is not currently executing.
398 The LART uses the same LED for both Timer LED and CPU usage LED
399 functions. You may choose to use both, but the Timer LED function
400 will overrule the CPU usage LED.
402 config ALIGNMENT_TRAP
404 default y if !ARCH_EBSA110
406 ARM processors can not fetch/store information which is not
407 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
408 address divisible by 4. On 32-bit ARM processors, these non-aligned
409 fetch/store instructions will be emulated in software if you say
410 here, which has a severe performance impact. This is necessary for
411 correct operation of some network protocols. With an IP-only
412 configuration it is safe to say N, otherwise say Y.
418 # Compressed boot loader in ROM. Yes, we really want to ask about
419 # TEXT and BSS so we preserve their values in the config files.
420 config ZBOOT_ROM_TEXT
421 hex "Compressed ROM boot loader base address"
424 The physical address at which the ROM-able zImage is to be
425 placed in the target. Platforms which normally make use of
426 ROM-able zImage formats normally set this to a suitable
427 value in their defconfig file.
429 If ZBOOT_ROM is not enabled, this has no effect.
432 hex "Compressed ROM boot loader BSS address"
435 The base address of 64KiB of read/write memory in the target
436 for the ROM-able zImage, which must be available while the
437 decompressor is running. Platforms which normally make use of
438 ROM-able zImage formats normally set this to a suitable
439 value in their defconfig file.
441 If ZBOOT_ROM is not enabled, this has no effect.
444 bool "Compressed boot loader in ROM/flash"
445 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
447 Say Y here if you intend to execute your compressed kernel image
448 (zImage) directly from ROM or flash. If unsure, say N.
451 string "Default kernel command string"
454 On some architectures (EBSA110 and CATS), there is currently no way
455 for the boot loader to pass arguments to the kernel. For these
456 architectures, you should supply some command-line options at build
457 time by entering them here. As a minimum, you should specify the
458 memory size and the root device (e.g., mem=64M root=/dev/nfs).
461 bool "Kernel Execute-In-Place from ROM"
462 depends on !ZBOOT_ROM
464 Execute-In-Place allows the kernel to run from non-volatile storage
465 directly addressable by the CPU, such as NOR flash. This saves RAM
466 space since the text section of the kernel is not loaded from flash
467 to RAM. Read-write sections, such as the data section and stack,
468 are still copied to RAM. The XIP kernel is not compressed since
469 it has to run directly from flash, so it will take more space to
470 store it. The flash address used to link the kernel object files,
471 and for storing it, is configuration dependent. Therefore, if you
472 say Y here, you must know the proper physical address where to
473 store the kernel image depending on your own flash memory usage.
475 Also note that the make target becomes "make xipImage" rather than
476 "make zImage" or "make Image". The final kernel binary to put in
477 ROM memory will be arch/arm/boot/xipImage.
482 hex "XIP Kernel Physical Location"
483 depends on XIP_KERNEL
486 This is the physical address in your flash memory the kernel will
487 be linked for and stored to. This address is dependent on your
492 if (ARCH_SA1100 || ARCH_INTEGRATOR)
494 menu "CPU Frequency scaling"
496 source "drivers/cpufreq/Kconfig"
498 config CPU_FREQ_SA1100
500 depends on CPU_FREQ && (SA1100_LART || SA1100_PLEB)
503 config CPU_FREQ_SA1110
505 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
508 config CPU_FREQ_INTEGRATOR
509 tristate "CPUfreq driver for ARM Integrator CPUs"
510 depends on ARCH_INTEGRATOR && CPU_FREQ
513 This enables the CPUfreq driver for ARM Integrator CPUs.
515 For details, take a look at <file:Documentation/cpu-freq>.
523 menu "Floating point emulation"
525 comment "At least one emulation must be selected"
528 bool "NWFPE math emulation"
530 Say Y to include the NWFPE floating point emulator in the kernel.
531 This is necessary to run most binaries. Linux does not currently
532 support floating point hardware so you need to say Y here even if
533 your machine has an FPA or floating point co-processor podule.
535 You may say N here if you are going to load the Acorn FPEmulator
539 bool "Support extended precision"
540 depends on FPE_NWFPE && !CPU_BIG_ENDIAN
542 Say Y to include 80-bit support in the kernel floating-point
543 emulator. Otherwise, only 32 and 64-bit support is compiled in.
544 Note that gcc does not generate 80-bit operations by default,
545 so in most cases this option only enlarges the size of the
546 floating point emulator without any good reason.
548 You almost surely want to say N here.
551 bool "FastFPE math emulation (EXPERIMENTAL)"
552 depends on !CPU_32v3 && EXPERIMENTAL
554 Say Y here to include the FAST floating point emulator in the kernel.
555 This is an experimental much faster emulator which now also has full
556 precision for the mantissa. It does not support any exceptions.
557 It is very simple, and approximately 3-6 times faster than NWFPE.
559 It should be sufficient for most programs. It may be not suitable
560 for scientific calculations, but you have to check this for yourself.
561 If you do not feel you need a faster FP emulation you should better
565 bool "VFP-format floating point maths"
566 depends on CPU_V6 || CPU_ARM926T
568 Say Y to include VFP support code in the kernel. This is needed
569 if your hardware includes a VFP unit.
571 Please see <file:Documentation/arm/VFP/release-notes.txt> for
572 release notes and additional status information.
574 Say N if your target does not have VFP hardware.
578 menu "Userspace binary formats"
580 source "fs/Kconfig.binfmt"
583 tristate "RISC OS personality"
585 Say Y here to include the kernel code necessary if you want to run
586 Acorn RISC OS/Arthur binaries under Linux. This code is still very
587 experimental; if this sounds frightening, say N and sleep in peace.
588 You can also say M here to compile this support as a module (which
589 will be called arthur).
593 menu "Power management options"
596 bool "Power Management support"
598 "Power Management" means that parts of your computer are shut
599 off or put into a power conserving "sleep" mode if they are not
600 being used. There are two competing standards for doing this: APM
601 and ACPI. If you want to use either one, say Y here and then also
602 to the requisite support below.
604 Power Management is most important for battery powered laptop
605 computers; if you have a laptop, check out the Linux Laptop home
606 page on the WWW at <http://www.linux-on-laptops.com/> or
607 Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
608 and the Battery Powered Linux mini-HOWTO, available from
609 <http://www.tldp.org/docs.html#howto>.
611 Note that, even if you say N here, Linux on the x86 architecture
612 will issue the hlt instruction if nothing is to be done, thereby
613 sending the processor to sleep and saving power.
616 tristate "Advanced Power Management Emulation"
619 APM is a BIOS specification for saving power using several different
620 techniques. This is mostly useful for battery powered laptops with
621 APM compliant BIOSes. If you say Y here, the system time will be
622 reset after a RESUME operation, the /proc/apm device will provide
623 battery status information, and user-space programs will receive
624 notification of APM "events" (e.g. battery status change).
626 If you select "Y" here, you can disable actual use of the APM
627 BIOS by passing the "apm=off" option to the kernel at boot time.
629 Note that the APM support is almost completely disabled for
630 machines with more than one CPU.
632 In order to use APM, you will need supporting software. For location
633 and more information, read <file:Documentation/pm.txt> and the
634 Battery Powered Linux mini-HOWTO, available from
635 <http://www.tldp.org/docs.html#howto>.
637 This driver does not spin down disk drives (see the hdparm(8)
638 manpage ("man 8 hdparm") for that), and it doesn't turn off
639 VESA-compliant "green" monitors.
641 This driver does not support the TI 4000M TravelMate and the ACER
642 486/DX4/75 because they don't have compliant BIOSes. Many "green"
643 desktop machines also don't have compliant BIOSes, and this driver
644 may cause those machines to panic during the boot phase.
646 Generally, if you don't have a battery in your machine, there isn't
647 much point in using this driver and you should say N. If you get
648 random kernel OOPSes or reboots that don't seem to be related to
649 anything, try disabling/enabling this option (or disabling/enabling
652 Some other things you should try when experiencing seemingly random,
655 1) make sure that you have enough swap space and that it is
657 2) pass the "no-hlt" option to the kernel
658 3) switch on floating point emulation in the kernel and pass
659 the "no387" option to the kernel
660 4) pass the "floppy=nodma" option to the kernel
661 5) pass the "mem=4M" option to the kernel (thereby disabling
662 all but the first 4 MB of RAM)
663 6) make sure that the CPU is not over clocked.
664 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
665 8) disable the cache from your BIOS settings
666 9) install a fan for the video card or exchange video RAM
667 10) install a better fan for the CPU
668 11) exchange RAM chips
669 12) exchange the motherboard.
671 To compile this driver as a module, choose M here: the
672 module will be called apm.
676 menu "Device Drivers"
678 source "drivers/base/Kconfig"
681 source "drivers/mtd/Kconfig"
684 source "drivers/parport/Kconfig"
686 source "drivers/pnp/Kconfig"
688 source "drivers/block/Kconfig"
690 source "drivers/acorn/block/Kconfig"
692 if ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
693 source "drivers/ide/Kconfig"
696 source "drivers/scsi/Kconfig"
698 source "drivers/md/Kconfig"
700 source "drivers/message/fusion/Kconfig"
702 source "drivers/ieee1394/Kconfig"
704 source "drivers/message/i2o/Kconfig"
708 source "drivers/isdn/Kconfig"
710 # input before char - char/joystick depends on it. As does USB.
712 source "drivers/input/Kconfig"
714 source "drivers/char/Kconfig"
716 source "drivers/i2c/Kconfig"
718 #source "drivers/l3/Kconfig"
720 source "drivers/misc/Kconfig"
722 source "drivers/media/Kconfig"
724 source "drivers/video/Kconfig"
726 source "sound/Kconfig"
728 source "drivers/usb/Kconfig"
730 source "drivers/mmc/Kconfig"
736 source "arch/arm/oprofile/Kconfig"
738 source "arch/arm/Kconfig.debug"
740 source "security/Kconfig"
742 source "crypto/Kconfig"