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"
90 bool "CLPS711x/EP721x-based"
95 select FOOTBRIDGE_ADDIN
100 This is an evaluation board for the StrongARM processor available
101 from Digital. It has limited hardware on-board, including an onboard
102 Ethernet interface, two PCMCIA sockets, two serial ports and a
108 This enables support for Altera's Excalibur XA10 development board.
109 If you would like to build your kernel to run on one of these boards
110 then you must say 'Y' here. Otherwise say 'N'
112 config ARCH_FOOTBRIDGE
116 config ARCH_INTEGRATOR
129 bool "IXP2400/2800-based"
135 Say Y here if you intend to run this kernel on a LinkUp Systems
136 L7200 Software Development Board which uses an ARM720T processor.
137 Information on this board can be obtained at:
139 <http://www.linkupsys.com/>
141 If you have any questions or comments about the Linux kernel port
142 to this board, send e-mail to <sjhill@cotw.com>.
153 On the Acorn Risc-PC, Linux can support the internal IDE disk and
154 CD-ROM interface, serial and parallel port, and the floppy drive.
160 bool "Samsung S3C2410"
162 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
163 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
164 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.
191 bool "Hynix-HMS720x-based"
193 This enables support for systems based on the Hynix HMS720x
197 source "arch/arm/mach-clps711x/Kconfig"
199 source "arch/arm/mach-epxa10db/Kconfig"
201 source "arch/arm/mach-footbridge/Kconfig"
203 source "arch/arm/mach-integrator/Kconfig"
205 source "arch/arm/mach-iop3xx/Kconfig"
207 source "arch/arm/mach-ixp4xx/Kconfig"
209 source "arch/arm/mach-ixp2000/Kconfig"
211 source "arch/arm/mach-pxa/Kconfig"
213 source "arch/arm/mach-sa1100/Kconfig"
215 source "arch/arm/mach-omap/Kconfig"
217 source "arch/arm/mach-s3c2410/Kconfig"
219 source "arch/arm/mach-lh7a40x/Kconfig"
221 source "arch/arm/mach-imx/Kconfig"
223 source "arch/arm/mach-h720x/Kconfig"
225 source "arch/arm/mach-versatile/Kconfig"
227 # Definitions to make life easier
231 source arch/arm/mm/Kconfig
233 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
236 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
241 source "arch/arm/common/Kconfig"
243 config FORCE_MAX_ZONEORDER
255 depends on FOOTBRIDGE_HOST || ARCH_SHARK || ARCH_CLPS7500 || ARCH_EBSA110 || ARCH_CDB89712 || ARCH_EDB7211 || ARCH_SA1100 || ARCH_MX1ADS
258 Find out whether you have ISA slots on your motherboard. ISA is the
259 name of a bus system, i.e. the way the CPU talks to the other stuff
260 inside your box. Other bus systems are PCI, EISA, MicroChannel
261 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
262 newer boards don't support it. If you have ISA, say Y, otherwise N.
266 depends on FOOTBRIDGE_HOST || ARCH_SHARK
274 bool "PCI support" if ARCH_INTEGRATOR_AP
275 default y if ARCH_SHARK || FOOTBRIDGE_HOST || ARCH_IOP3XX || ARCH_IXP4XX || ARCH_IXP2000
277 Find out whether you have a PCI motherboard. PCI is the name of a
278 bus system, i.e. the way the CPU talks to the other stuff inside
279 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
280 VESA. If you have PCI, say Y, otherwise N.
282 The PCI-HOWTO, available from
283 <http://www.tldp.org/docs.html#howto>, contains valuable
284 information about which PCI hardware does work under Linux and which
287 # Select the host bridge type
288 config PCI_HOST_VIA82C505
290 depends on PCI && ARCH_SHARK
293 source "drivers/pci/Kconfig"
295 source "drivers/pcmcia/Kconfig"
299 menu "Kernel Features"
302 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
303 depends on EXPERIMENTAL && n
305 This enables support for systems with more than one CPU. If you have
306 a system with only one CPU, like most personal computers, say N. If
307 you have a system with more than one CPU, say Y.
309 If you say N here, the kernel will run on single and multiprocessor
310 machines, but will use only one CPU of a multiprocessor machine. If
311 you say Y here, the kernel will run on many, but not all, single
312 processor machines. On a single processor machine, the kernel will
313 run faster if you say N here.
315 See also the <file:Documentation/smp.tex>,
316 <file:Documentation/smp.txt>, <file:Documentation/i386/IO-APIC.txt>,
317 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
318 <http://www.linuxdoc.org/docs.html#howto>.
320 If you don't know what to do here, say N.
323 int "Maximum number of CPUs (2-32)"
329 bool "Preemptible Kernel (EXPERIMENTAL)"
330 depends on EXPERIMENTAL
332 This option reduces the latency of the kernel when reacting to
333 real-time or interactive events by allowing a low priority process to
334 be preempted even if it is in kernel mode executing a system call.
335 This allows applications to run more reliably even when the system is
338 Say Y here if you are building a kernel for a desktop, embedded
339 or real-time system. Say N if you are unsure.
343 depends on ARCH_EDB7211 || ARCH_SA1100 || (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
346 Say Y to support efficient handling of discontiguous physical memory,
347 for architectures which are either NUMA (Non-Uniform Memory Access)
348 or have huge holes in the physical address space for other reasons.
349 See <file:Documentation/vm/numa> for more.
352 bool "Timer and CPU usage LEDs"
353 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
354 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
355 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
356 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
357 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE
359 If you say Y here, the LEDs on your machine will be used
360 to provide useful information about your current system status.
362 If you are compiling a kernel for a NetWinder or EBSA-285, you will
363 be able to select which LEDs are active using the options below. If
364 you are compiling a kernel for the EBSA-110 or the LART however, the
365 red LED will simply flash regularly to indicate that the system is
366 still functional. It is safe to say Y here if you have a CATS
367 system, but the driver will do nothing.
370 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
371 MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
373 default y if ARCH_EBSA110
375 If you say Y here, one of the system LEDs (the green one on the
376 NetWinder, the amber one on the EBSA285, or the red one on the LART)
377 will flash regularly to indicate that the system is still
378 operational. This is mainly useful to kernel hackers who are
379 debugging unstable kernels.
381 The LART uses the same LED for both Timer LED and CPU usage LED
382 functions. You may choose to use both, but the Timer LED function
383 will overrule the CPU usage LED.
386 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
387 !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
390 If you say Y here, the red LED will be used to give a good real
391 time indication of CPU usage, by lighting whenever the idle task
392 is not currently executing.
394 The LART uses the same LED for both Timer LED and CPU usage LED
395 functions. You may choose to use both, but the Timer LED function
396 will overrule the CPU usage LED.
398 config ALIGNMENT_TRAP
400 default y if !ARCH_EBSA110
402 ARM processors can not fetch/store information which is not
403 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
404 address divisible by 4. On 32-bit ARM processors, these non-aligned
405 fetch/store instructions will be emulated in software if you say
406 here, which has a severe performance impact. This is necessary for
407 correct operation of some network protocols. With an IP-only
408 configuration it is safe to say N, otherwise say Y.
414 # Compressed boot loader in ROM. Yes, we really want to ask about
415 # TEXT and BSS so we preserve their values in the config files.
416 config ZBOOT_ROM_TEXT
417 hex "Compressed ROM boot loader base address"
420 The physical address at which the ROM-able zImage is to be
421 placed in the target. Platforms which normally make use of
422 ROM-able zImage formats normally set this to a suitable
423 value in their defconfig file.
425 If ZBOOT_ROM is not enabled, this has no effect.
428 hex "Compressed ROM boot loader BSS address"
431 The base address of 64KiB of read/write memory in the target
432 for the ROM-able zImage, which must be available while the
433 decompressor is running. Platforms which normally make use of
434 ROM-able zImage formats normally set this to a suitable
435 value in their defconfig file.
437 If ZBOOT_ROM is not enabled, this has no effect.
440 bool "Compressed boot loader in ROM/flash"
441 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
443 Say Y here if you intend to execute your compressed kernel image
444 (zImage) directly from ROM or flash. If unsure, say N.
447 string "Default kernel command string"
450 On some architectures (EBSA110 and CATS), there is currently no way
451 for the boot loader to pass arguments to the kernel. For these
452 architectures, you should supply some command-line options at build
453 time by entering them here. As a minimum, you should specify the
454 memory size and the root device (e.g., mem=64M root=/dev/nfs).
457 bool "Kernel Execute-In-Place from ROM"
458 depends on !ZBOOT_ROM
460 Execute-In-Place allows the kernel to run from non-volatile storage
461 directly addressable by the CPU, such as NOR flash. This saves RAM
462 space since the text section of the kernel is not loaded from flash
463 to RAM. Read-write sections, such as the data section and stack,
464 are still copied to RAM. The XIP kernel is not compressed since
465 it has to run directly from flash, so it will take more space to
466 store it. The flash address used to link the kernel object files,
467 and for storing it, is configuration dependent. Therefore, if you
468 say Y here, you must know the proper physical address where to
469 store the kernel image depending on your own flash memory usage.
471 Also note that the make target becomes "make xipImage" rather than
472 "make zImage" or "make Image". The final kernel binary to put in
473 ROM memory will be arch/arm/boot/xipImage.
478 hex "XIP Kernel Physical Location"
479 depends on XIP_KERNEL
482 This is the physical address in your flash memory the kernel will
483 be linked for and stored to. This address is dependent on your
488 if (ARCH_SA1100 || ARCH_INTEGRATOR)
490 menu "CPU Frequency scaling"
492 source "drivers/cpufreq/Kconfig"
494 config CPU_FREQ_SA1100
496 depends on CPU_FREQ && (SA1100_LART || SA1100_PLEB)
499 config CPU_FREQ_SA1110
501 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
504 config CPU_FREQ_INTEGRATOR
505 tristate "CPUfreq driver for ARM Integrator CPUs"
506 depends on ARCH_INTEGRATOR && CPU_FREQ
509 This enables the CPUfreq driver for ARM Integrator CPUs.
511 For details, take a look at <file:Documentation/cpu-freq>.
519 menu "Floating point emulation"
521 comment "At least one emulation must be selected"
524 bool "NWFPE math emulation"
526 Say Y to include the NWFPE floating point emulator in the kernel.
527 This is necessary to run most binaries. Linux does not currently
528 support floating point hardware so you need to say Y here even if
529 your machine has an FPA or floating point co-processor podule.
531 You may say N here if you are going to load the Acorn FPEmulator
535 bool "Support extended precision"
536 depends on FPE_NWFPE && !CPU_BIG_ENDIAN
538 Say Y to include 80-bit support in the kernel floating-point
539 emulator. Otherwise, only 32 and 64-bit support is compiled in.
540 Note that gcc does not generate 80-bit operations by default,
541 so in most cases this option only enlarges the size of the
542 floating point emulator without any good reason.
544 You almost surely want to say N here.
547 bool "FastFPE math emulation (EXPERIMENTAL)"
548 depends on !CPU_32v3 && EXPERIMENTAL
550 Say Y here to include the FAST floating point emulator in the kernel.
551 This is an experimental much faster emulator which now also has full
552 precision for the mantissa. It does not support any exceptions.
553 It is very simple, and approximately 3-6 times faster than NWFPE.
555 It should be sufficient for most programs. It may be not suitable
556 for scientific calculations, but you have to check this for yourself.
557 If you do not feel you need a faster FP emulation you should better
561 bool "VFP-format floating point maths"
562 depends on CPU_V6 || CPU_ARM926T
564 Say Y to include VFP support code in the kernel. This is needed
565 if your hardware includes a VFP unit.
567 Please see <file:Documentation/arm/VFP/release-notes.txt> for
568 release notes and additional status information.
570 Say N if your target does not have VFP hardware.
574 menu "Userspace binary formats"
576 source "fs/Kconfig.binfmt"
579 tristate "RISC OS personality"
581 Say Y here to include the kernel code necessary if you want to run
582 Acorn RISC OS/Arthur binaries under Linux. This code is still very
583 experimental; if this sounds frightening, say N and sleep in peace.
584 You can also say M here to compile this support as a module (which
585 will be called arthur).
589 menu "Power management options"
592 bool "Power Management support"
594 "Power Management" means that parts of your computer are shut
595 off or put into a power conserving "sleep" mode if they are not
596 being used. There are two competing standards for doing this: APM
597 and ACPI. If you want to use either one, say Y here and then also
598 to the requisite support below.
600 Power Management is most important for battery powered laptop
601 computers; if you have a laptop, check out the Linux Laptop home
602 page on the WWW at <http://www.linux-on-laptops.com/> or
603 Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
604 and the Battery Powered Linux mini-HOWTO, available from
605 <http://www.tldp.org/docs.html#howto>.
607 Note that, even if you say N here, Linux on the x86 architecture
608 will issue the hlt instruction if nothing is to be done, thereby
609 sending the processor to sleep and saving power.
612 tristate "Advanced Power Management Emulation"
615 APM is a BIOS specification for saving power using several different
616 techniques. This is mostly useful for battery powered laptops with
617 APM compliant BIOSes. If you say Y here, the system time will be
618 reset after a RESUME operation, the /proc/apm device will provide
619 battery status information, and user-space programs will receive
620 notification of APM "events" (e.g. battery status change).
622 If you select "Y" here, you can disable actual use of the APM
623 BIOS by passing the "apm=off" option to the kernel at boot time.
625 Note that the APM support is almost completely disabled for
626 machines with more than one CPU.
628 In order to use APM, you will need supporting software. For location
629 and more information, read <file:Documentation/pm.txt> and the
630 Battery Powered Linux mini-HOWTO, available from
631 <http://www.tldp.org/docs.html#howto>.
633 This driver does not spin down disk drives (see the hdparm(8)
634 manpage ("man 8 hdparm") for that), and it doesn't turn off
635 VESA-compliant "green" monitors.
637 This driver does not support the TI 4000M TravelMate and the ACER
638 486/DX4/75 because they don't have compliant BIOSes. Many "green"
639 desktop machines also don't have compliant BIOSes, and this driver
640 may cause those machines to panic during the boot phase.
642 Generally, if you don't have a battery in your machine, there isn't
643 much point in using this driver and you should say N. If you get
644 random kernel OOPSes or reboots that don't seem to be related to
645 anything, try disabling/enabling this option (or disabling/enabling
648 Some other things you should try when experiencing seemingly random,
651 1) make sure that you have enough swap space and that it is
653 2) pass the "no-hlt" option to the kernel
654 3) switch on floating point emulation in the kernel and pass
655 the "no387" option to the kernel
656 4) pass the "floppy=nodma" option to the kernel
657 5) pass the "mem=4M" option to the kernel (thereby disabling
658 all but the first 4 MB of RAM)
659 6) make sure that the CPU is not over clocked.
660 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
661 8) disable the cache from your BIOS settings
662 9) install a fan for the video card or exchange video RAM
663 10) install a better fan for the CPU
664 11) exchange RAM chips
665 12) exchange the motherboard.
667 To compile this driver as a module, choose M here: the
668 module will be called apm.
672 menu "Device Drivers"
674 source "drivers/base/Kconfig"
677 source "drivers/mtd/Kconfig"
680 source "drivers/parport/Kconfig"
682 source "drivers/pnp/Kconfig"
684 source "drivers/block/Kconfig"
686 source "drivers/acorn/block/Kconfig"
688 if ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
689 source "drivers/ide/Kconfig"
692 source "drivers/scsi/Kconfig"
694 source "drivers/md/Kconfig"
696 source "drivers/message/fusion/Kconfig"
698 source "drivers/ieee1394/Kconfig"
700 source "drivers/message/i2o/Kconfig"
704 source "drivers/isdn/Kconfig"
706 # input before char - char/joystick depends on it. As does USB.
708 source "drivers/input/Kconfig"
710 source "drivers/char/Kconfig"
712 source "drivers/i2c/Kconfig"
714 #source "drivers/l3/Kconfig"
716 source "drivers/misc/Kconfig"
718 source "drivers/media/Kconfig"
720 source "drivers/video/Kconfig"
722 source "sound/Kconfig"
724 source "drivers/usb/Kconfig"
726 source "drivers/mmc/Kconfig"
732 source "arch/arm/oprofile/Kconfig"
734 source "arch/arm/Kconfig.debug"
736 source "security/Kconfig"
738 source "crypto/Kconfig"