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_BUST_SPINLOCK
63 config GENERIC_ISA_DMA
75 prompt "ARM system type"
79 bool "Cirrus-CL-PS7500FE"
82 bool "CLPS711x/EP721x-based"
87 select FOOTBRIDGE_ADDIN
92 This is an evaluation board for the StrongARM processor available
93 from Digital. It has limited hardware on-board, including an onboard
94 Ethernet interface, two PCMCIA sockets, two serial ports and a
100 This enables support for Altera's Excalibur XA10 development board.
101 If you would like to build your kernel to run on one of these boards
102 then you must say 'Y' here. Otherwise say 'N'
104 config ARCH_FOOTBRIDGE
108 config ARCH_INTEGRATOR
118 bool "IXP2400/2800-based"
123 Say Y here if you intend to run this kernel on a LinkUp Systems
124 L7200 Software Development Board which uses an ARM720T processor.
125 Information on this board can be obtained at:
127 <http://www.linkupsys.com/>
129 If you have any questions or comments about the Linux kernel port
130 to this board, send e-mail to sjhill@cotw.com.
138 On the Acorn Risc-PC, Linux can support the internal IDE disk and
139 CD-ROM interface, serial and parallel port, and the floppy drive.
145 bool "Samsung S3C2410"
147 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
148 BAST (http://www.simtec.co.uk/products/EB110ITX/), the IPAQ 1940 or
149 the Samsung SMDK2410 development board (and derviatives).
157 Say Y here for systems based on one of the Sharp LH7A40X
158 System on a Chip processors. These CPUs include an ARM922T
159 core with a wide array of integrated devices for
160 hand-held and low-power applications.
165 config ARCH_VERSATILE_PB
168 This enables support for ARM Ltd Versatile PB board.
174 bool "Hynix-HMS720x-based"
176 This enables support for systems based on the Hynix HMS720x
180 source "arch/arm/mach-clps711x/Kconfig"
182 source "arch/arm/mach-epxa10db/Kconfig"
184 source "arch/arm/mach-footbridge/Kconfig"
186 source "arch/arm/mach-integrator/Kconfig"
188 source "arch/arm/mach-iop3xx/Kconfig"
190 source "arch/arm/mach-ixp4xx/Kconfig"
192 source "arch/arm/mach-ixp2000/Kconfig"
194 source "arch/arm/mach-pxa/Kconfig"
196 source "arch/arm/mach-sa1100/Kconfig"
198 source "arch/arm/mach-omap/Kconfig"
200 source "arch/arm/mach-s3c2410/Kconfig"
202 source "arch/arm/mach-lh7a40x/Kconfig"
204 source "arch/arm/mach-imx/Kconfig"
206 source "arch/arm/mach-h720x/Kconfig"
208 # Definitions to make life easier
216 depends on ARCH_ACORN || ARCH_CLPS7500
219 #####################################################################
223 depends on ASSABET_NEPONSET || SA1100_ADSBITSY || SA1100_BADGE4 || SA1100_CONSUS || SA1100_GRAPHICSMASTER || SA1100_JORNADA720 || ARCH_LUBBOCK || SA1100_PFS168 || SA1100_PT_SYSTEM3 || SA1100_XP860
228 depends on SA1100_COLLIE
231 config FORCE_MAX_ZONEORDER
238 depends on SA1111 || ARCH_IXP4XX
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
253 # Select various configuration options depending on the machine type
256 depends on ARCH_EDB7211 || ARCH_SA1100 || (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
259 Say Y to support efficient handling of discontiguous physical memory,
260 for architectures which are either NUMA (Non-Uniform Memory Access)
261 or have huge holes in the physical address space for other reasons.
262 See <file:Documentation/vm/numa> for more.
264 # Now handle the bus types
266 bool "PCI support" if ARCH_INTEGRATOR_AP
267 default y if ARCH_SHARK || FOOTBRIDGE_HOST || ARCH_IOP3XX || ARCH_IXP4XX || ARCH_IXP2000
269 Find out whether you have a PCI motherboard. PCI is the name of a
270 bus system, i.e. the way the CPU talks to the other stuff inside
271 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
272 VESA. If you have PCI, say Y, otherwise N.
274 The PCI-HOWTO, available from
275 <http://www.tldp.org/docs.html#howto>, contains valuable
276 information about which PCI hardware does work under Linux and which
279 # Select the host bridge type
280 config PCI_HOST_VIA82C505
282 depends on PCI && ARCH_SHARK
287 depends on ARCH_INTEGRATOR
292 depends on ARCH_INTEGRATOR || ARCH_VERSATILE_PB
297 depends on FOOTBRIDGE_HOST || ARCH_SHARK || ARCH_CLPS7500 || ARCH_EBSA110 || ARCH_CDB89712 || ARCH_EDB7211 || ARCH_SA1100 || ARCH_MX1ADS
300 Find out whether you have ISA slots on your motherboard. ISA is the
301 name of a bus system, i.e. the way the CPU talks to the other stuff
302 inside your box. Other bus systems are PCI, EISA, MicroChannel
303 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
304 newer boards don't support it. If you have ISA, say Y, otherwise N.
308 depends on FOOTBRIDGE_HOST || ARCH_SHARK
313 depends on ARCH_ACORN || ARCH_L7200 || ARCH_LH7A400
316 # Compressed boot loader in ROM. Yes, we really want to ask about
317 # TEXT and BSS so we preserve their values in the config files.
319 bool "Compressed boot loader in ROM/flash"
321 Say Y here if you intend to execute your compressed kernel image (zImage)
322 directly from ROM or flash. If unsure, say N.
324 config ZBOOT_ROM_TEXT
325 hex "Compressed ROM boot loader base address"
328 The base address for zImage. Unless you have special requirements, you
329 should not change this value.
332 hex "Compressed ROM boot loader BSS address"
335 The base address of 64KiB of read/write memory, which must be available
336 while the decompressor is running. Unless you have special requirements,
337 you should not change this value.
339 if (ARCH_SA1100 || ARCH_INTEGRATOR)
342 bool "Support CPU clock change"
344 CPU clock scaling allows you to change the clock speed of the
345 running CPU on the fly. This is a nice method to save battery power,
346 because the lower the clock speed, the less power the CPU
347 consumes. Note that this driver doesn't automatically change the CPU
348 clock speed, you need some userland tools (which still have to be
349 written) to implement the policy. If you don't understand what this
350 is all about, it's safe to say 'N'.
352 source "drivers/cpufreq/Kconfig"
354 config CPU_FREQ_SA1100
356 depends on CPU_FREQ && SA1100_LART
359 config CPU_FREQ_SA1110
361 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
364 config CPU_FREQ_INTEGRATOR
365 tristate "CPUfreq driver for ARM Integrator CPUs"
366 depends on ARCH_INTEGRATOR && ICST525 && CPU_FREQ
369 This enables the CPUfreq driver for ARM Integrator CPUs.
371 For details, take a look at <file:Documentation/cpu-freq>.
377 source "drivers/pci/Kconfig"
379 source "drivers/pcmcia/Kconfig"
381 comment "At least one math emulation must be selected"
384 bool "NWFPE math emulation"
386 Say Y to include the NWFPE floating point emulator in the kernel.
387 This is necessary to run most binaries. Linux does not currently
388 support floating point hardware so you need to say Y here even if
389 your machine has an FPA or floating point co-processor podule.
391 You may say N here if you are going to load the Acorn FPEmulator
395 bool "Support extended precision"
396 depends on FPE_NWFPE && !CPU_BIG_ENDIAN
398 Say Y to include 80-bit support in the kernel floating-point
399 emulator. Otherwise, only 32 and 64-bit support is compiled in.
400 Note that gcc does not generate 80-bit operations by default,
401 so in most cases this option only enlarges the size of the
402 floating point emulator without any good reason.
404 You almost surely want to say N here.
407 bool "FastFPE math emulation (EXPERIMENTAL)"
408 depends on !CPU_32v3 && EXPERIMENTAL
410 Say Y here to include the FAST floating point emulator in the kernel.
411 This is an experimental much faster emulator which now also has full
412 precision for the mantissa. It does not support any exceptions.
413 It is very simple, and approximately 3-6 times faster than NWFPE.
415 It should be sufficient for most programs. It may be not suitable
416 for scientific calculations, but you have to check this for yourself.
417 If you do not feel you need a faster FP emulation you should better
421 bool "VFP-format floating point maths"
422 depends on CPU_V6 || CPU_ARM926T
424 Say Y to include VFP support code in the kernel. This is needed
425 if your hardware includes a VFP unit.
427 Please see <file:Documentation/arm/VFP/release-notes.txt> for
428 release notes and additional status information.
430 Say N if your target does not have VFP hardware.
432 source "fs/Kconfig.binfmt"
434 source "drivers/base/Kconfig"
437 bool "Power Management support"
439 "Power Management" means that parts of your computer are shut
440 off or put into a power conserving "sleep" mode if they are not
441 being used. There are two competing standards for doing this: APM
442 and ACPI. If you want to use either one, say Y here and then also
443 to the requisite support below.
445 Power Management is most important for battery powered laptop
446 computers; if you have a laptop, check out the Linux Laptop home
447 page on the WWW at <http://www.linux-on-laptops.com/> or
448 Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
449 and the Battery Powered Linux mini-HOWTO, available from
450 <http://www.tldp.org/docs.html#howto>.
452 Note that, even if you say N here, Linux on the x86 architecture
453 will issue the hlt instruction if nothing is to be done, thereby
454 sending the processor to sleep and saving power.
457 bool "Preemptible Kernel (EXPERIMENTAL)"
458 depends on CPU_32 && EXPERIMENTAL
460 This option reduces the latency of the kernel when reacting to
461 real-time or interactive events by allowing a low priority process to
462 be preempted even if it is in kernel mode executing a system call.
463 This allows applications to run more reliably even when the system is
466 Say Y here if you are building a kernel for a desktop, embedded
467 or real-time system. Say N if you are unsure.
470 tristate "Advanced Power Management Emulation"
473 APM is a BIOS specification for saving power using several different
474 techniques. This is mostly useful for battery powered laptops with
475 APM compliant BIOSes. If you say Y here, the system time will be
476 reset after a RESUME operation, the /proc/apm device will provide
477 battery status information, and user-space programs will receive
478 notification of APM "events" (e.g. battery status change).
480 If you select "Y" here, you can disable actual use of the APM
481 BIOS by passing the "apm=off" option to the kernel at boot time.
483 Note that the APM support is almost completely disabled for
484 machines with more than one CPU.
486 In order to use APM, you will need supporting software. For location
487 and more information, read <file:Documentation/pm.txt> and the
488 Battery Powered Linux mini-HOWTO, available from
489 <http://www.tldp.org/docs.html#howto>.
491 This driver does not spin down disk drives (see the hdparm(8)
492 manpage ("man 8 hdparm") for that), and it doesn't turn off
493 VESA-compliant "green" monitors.
495 This driver does not support the TI 4000M TravelMate and the ACER
496 486/DX4/75 because they don't have compliant BIOSes. Many "green"
497 desktop machines also don't have compliant BIOSes, and this driver
498 may cause those machines to panic during the boot phase.
500 Generally, if you don't have a battery in your machine, there isn't
501 much point in using this driver and you should say N. If you get
502 random kernel OOPSes or reboots that don't seem to be related to
503 anything, try disabling/enabling this option (or disabling/enabling
506 Some other things you should try when experiencing seemingly random,
509 1) make sure that you have enough swap space and that it is
511 2) pass the "no-hlt" option to the kernel
512 3) switch on floating point emulation in the kernel and pass
513 the "no387" option to the kernel
514 4) pass the "floppy=nodma" option to the kernel
515 5) pass the "mem=4M" option to the kernel (thereby disabling
516 all but the first 4 MB of RAM)
517 6) make sure that the CPU is not over clocked.
518 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
519 8) disable the cache from your BIOS settings
520 9) install a fan for the video card or exchange video RAM
521 10) install a better fan for the CPU
522 11) exchange RAM chips
523 12) exchange the motherboard.
525 To compile this driver as a module, choose M here: the
526 module will be called apm.
529 tristate "RISC OS personality"
532 Say Y here to include the kernel code necessary if you want to run
533 Acorn RISC OS/Arthur binaries under Linux. This code is still very
534 experimental; if this sounds frightening, say N and sleep in peace.
535 You can also say M here to compile this support as a module (which
536 will be called arthur).
539 string "Default kernel command string"
542 On some architectures (EBSA110 and CATS), there is currently no way
543 for the boot loader to pass arguments to the kernel. For these
544 architectures, you should supply some command-line options at build
545 time by entering them here. As a minimum, you should specify the
546 memory size and the root device (e.g., mem=64M root=/dev/nfs).
549 bool "Timer and CPU usage LEDs"
550 depends on ARCH_NETWINDER || ARCH_EBSA110 || ARCH_EBSA285 || ARCH_SHARK || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_CDB89712 || ARCH_P720T || ARCH_OMAP || ARCH_VERSATILE_PB || ARCH_IMX
552 If you say Y here, the LEDs on your machine will be used
553 to provide useful information about your current system status.
555 If you are compiling a kernel for a NetWinder or EBSA-285, you will
556 be able to select which LEDs are active using the options below. If
557 you are compiling a kernel for the EBSA-110 or the LART however, the
558 red LED will simply flash regularly to indicate that the system is
559 still functional. It is safe to say Y here if you have a CATS
560 system, but the driver will do nothing.
563 bool "Timer LED" if LEDS && (ARCH_NETWINDER || ARCH_EBSA285 || ARCH_SHARK || MACH_MAINSTONE || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_P720T || ARCH_VERSATILE_PB || ARCH_IMX)
564 depends on ARCH_NETWINDER || ARCH_EBSA110 || ARCH_EBSA285 || ARCH_SHARK || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_CDB89712 || ARCH_P720T || ARCH_OMAP || ARCH_VERSATILE_PB || ARCH_IMX
565 default y if ARCH_EBSA110
567 If you say Y here, one of the system LEDs (the green one on the
568 NetWinder, the amber one on the EBSA285, or the red one on the LART)
569 will flash regularly to indicate that the system is still
570 operational. This is mainly useful to kernel hackers who are
571 debugging unstable kernels.
573 The LART uses the same LED for both Timer LED and CPU usage LED
574 functions. You may choose to use both, but the Timer LED function
575 will overrule the CPU usage LED.
579 depends on LEDS && (ARCH_NETWINDER || ARCH_EBSA285 || ARCH_SHARK || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_P720T || ARCH_VERSATILE_PB || ARCH_IMX)
581 If you say Y here, the red LED will be used to give a good real
582 time indication of CPU usage, by lighting whenever the idle task
583 is not currently executing.
585 The LART uses the same LED for both Timer LED and CPU usage LED
586 functions. You may choose to use both, but the Timer LED function
587 will overrule the CPU usage LED.
589 config ALIGNMENT_TRAP
592 default y if !ARCH_EBSA110
594 ARM processors can not fetch/store information which is not
595 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
596 address divisible by 4. On 32-bit ARM processors, these non-aligned
597 fetch/store instructions will be emulated in software if you say
598 here, which has a severe performance impact. This is necessary for
599 correct operation of some network protocols. With an IP-only
600 configuration it is safe to say N, otherwise say Y.
604 source "drivers/parport/Kconfig"
607 source "drivers/mtd/Kconfig"
610 source "drivers/pnp/Kconfig"
612 source "drivers/block/Kconfig"
614 source "drivers/md/Kconfig"
616 source "drivers/acorn/block/Kconfig"
620 if ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
621 source "drivers/ide/Kconfig"
624 source "drivers/scsi/Kconfig"
626 source "drivers/message/fusion/Kconfig"
628 source "drivers/ieee1394/Kconfig"
630 source "drivers/message/i2o/Kconfig"
632 source "drivers/isdn/Kconfig"
635 # input before char - char/joystick depends on it. As does USB.
637 source "drivers/input/Kconfig"
639 source "drivers/char/Kconfig"
641 source "drivers/i2c/Kconfig"
643 #source "drivers/l3/Kconfig"
645 source "drivers/media/Kconfig"
649 source "arch/arm/oprofile/Kconfig"
651 source "drivers/video/Kconfig"
653 source "sound/Kconfig"
655 source "drivers/misc/Kconfig"
657 source "drivers/usb/Kconfig"
659 source "drivers/mmc/Kconfig"
661 source "arch/arm/Kconfig.debug"
663 source "security/Kconfig"
665 source "crypto/Kconfig"