2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
12 select SYS_SUPPORTS_APM_EMULATION
14 The ARM series is a line of low-power-consumption RISC chip designs
15 licensed by ARM Ltd and targeted at embedded applications and
16 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
17 manufactured, but legacy ARM-based PC hardware remains popular in
18 Europe. There is an ARM Linux project with a web page at
19 <http://www.arm.linux.org.uk/>.
21 config SYS_SUPPORTS_APM_EMULATION
32 config GENERIC_CLOCKEVENTS
47 The Extended Industry Standard Architecture (EISA) bus was
48 developed as an open alternative to the IBM MicroChannel bus.
50 The EISA bus provided some of the features of the IBM MicroChannel
51 bus while maintaining backward compatibility with cards made for
52 the older ISA bus. The EISA bus saw limited use between 1988 and
53 1995 when it was made obsolete by the PCI bus.
55 Say Y here if you are building a kernel for an EISA-based machine.
65 MicroChannel Architecture is found in some IBM PS/2 machines and
66 laptops. It is a bus system similar to PCI or ISA. See
67 <file:Documentation/mca.txt> (and especially the web page given
68 there) before attempting to build an MCA bus kernel.
70 config GENERIC_HARDIRQS
74 config STACKTRACE_SUPPORT
78 config LOCKDEP_SUPPORT
82 config TRACE_IRQFLAGS_SUPPORT
86 config HARDIRQS_SW_RESEND
90 config GENERIC_IRQ_PROBE
94 config RWSEM_GENERIC_SPINLOCK
98 config RWSEM_XCHGADD_ALGORITHM
101 config ARCH_HAS_ILOG2_U32
105 config ARCH_HAS_ILOG2_U64
109 config GENERIC_HWEIGHT
113 config GENERIC_CALIBRATE_DELAY
117 config GENERIC_BUST_SPINLOCK
120 config ARCH_MAY_HAVE_PC_FDC
127 config GENERIC_ISA_DMA
138 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
139 default DRAM_BASE if REMAP_VECTORS_TO_RAM
142 The base address of exception vectors.
144 source "init/Kconfig"
149 prompt "ARM system type"
150 default ARCH_VERSATILE
153 bool "Agilent AAEC-2000 based"
156 This enables support for systems based on the Agilent AAEC-2000
158 config ARCH_INTEGRATOR
159 bool "ARM Ltd. Integrator family"
163 Support for ARM's Integrator platform.
166 bool "ARM Ltd. RealView family"
170 This enables support for ARM Ltd RealView boards.
172 config ARCH_VERSATILE
173 bool "ARM Ltd. Versatile family"
178 select GENERIC_CLOCKEVENTS
180 This enables support for ARM Ltd Versatile board.
186 This enables support for systems based on the Atmel AT91RM9200
187 and AT91SAM9xxx processors.
190 bool "Cirrus CL-PS7500FE"
195 Support for the Cirrus Logic PS7500FE system-on-a-chip.
198 bool "Cirrus Logic CLPS711x/EP721x-based"
200 Support for Cirrus Logic 711x/721x based boards.
205 select FOOTBRIDGE_ADDIN
207 Support for Intel's EBSA285 companion chip.
214 This is an evaluation board for the StrongARM processor available
215 from Digital. It has limited hardware on-board, including an
216 Ethernet interface, two PCMCIA sockets, two serial ports and a
224 This enables support for the Cirrus EP93xx series of CPUs.
226 config ARCH_FOOTBRIDGE
230 Support for systems based on the DC21285 companion chip
231 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
234 bool "Hilscher NetX based"
237 This enables support for systems based on the Hilscher NetX Soc
240 bool "Hynix HMS720x-based"
243 This enables support for systems based on the Hynix HMS720x
248 Support for Motorola's i.MX family of processors (MX1, MXL).
256 Support for Intel's 80219 and IOP32X (XScale) family of
265 Support for Intel's IOP33X (XScale) family of processors.
272 select ARCH_SUPPORTS_MSI
274 Support for Intel's IOP13XX (XScale) family of processors.
280 select GENERIC_CLOCKEVENTS
282 Support for Intel's IXP4XX (XScale) family of processors.
285 bool "IXP2400/2800-based"
289 Support for Intel's IXP2400/2800 (XScale) family of processors.
296 Support for Intel's IXP23xx (XScale) family of processors.
302 Say Y here if you intend to run this kernel on a LinkUp Systems
303 L7200 Software Development Board which uses an ARM720T processor.
304 Information on this board can be obtained at:
306 <http://www.linkupsys.com/>
308 If you have any questions or comments about the Linux kernel port
309 to this board, send e-mail to <sjhill@cotw.com>.
312 bool "NetSilicon NS9xxx"
314 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
317 <http://www.digi.com/products/microprocessors/index.jsp>
320 bool "Philips Nexperia PNX4008 Mobile"
322 This enables support for Philips PNX4008 mobile platform.
331 Support for Intel's PXA2XX processor line.
338 select ARCH_MAY_HAVE_PC_FDC
342 On the Acorn Risc-PC, Linux can support the internal IDE disk and
343 CD-ROM interface, serial and parallel port, and the floppy drive.
348 select ARCH_DISCONTIGMEM_ENABLE
352 Support for StrongARM 11x0 based boards.
355 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
359 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
360 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
361 the Samsung SMDK2410 development board (and derivatives).
369 Support for the StrongARM based Digital DNARD machine, also known
370 as "Shark" (<http://www.shark-linux.de/shark.html>).
375 Say Y here for systems based on one of the Sharp LH7A40X
376 System on a Chip processors. These CPUs include an ARM922T
377 core with a wide array of integrated devices for
378 hand-held and low-power applications.
384 select GENERIC_CLOCKEVENTS
386 Support for TI's OMAP platform (OMAP1 and OMAP2).
390 source "arch/arm/mach-clps711x/Kconfig"
392 source "arch/arm/mach-ep93xx/Kconfig"
394 source "arch/arm/mach-footbridge/Kconfig"
396 source "arch/arm/mach-integrator/Kconfig"
398 source "arch/arm/mach-iop32x/Kconfig"
400 source "arch/arm/mach-iop33x/Kconfig"
402 source "arch/arm/mach-iop13xx/Kconfig"
404 source "arch/arm/mach-ixp4xx/Kconfig"
406 source "arch/arm/mach-ixp2000/Kconfig"
408 source "arch/arm/mach-ixp23xx/Kconfig"
410 source "arch/arm/mach-pxa/Kconfig"
412 source "arch/arm/mach-sa1100/Kconfig"
414 source "arch/arm/plat-omap/Kconfig"
416 source "arch/arm/mach-omap1/Kconfig"
418 source "arch/arm/mach-omap2/Kconfig"
420 source "arch/arm/plat-s3c24xx/Kconfig"
423 source "arch/arm/mach-s3c2400/Kconfig"
424 source "arch/arm/mach-s3c2410/Kconfig"
425 source "arch/arm/mach-s3c2412/Kconfig"
426 source "arch/arm/mach-s3c2440/Kconfig"
427 source "arch/arm/mach-s3c2442/Kconfig"
428 source "arch/arm/mach-s3c2443/Kconfig"
431 source "arch/arm/mach-lh7a40x/Kconfig"
433 source "arch/arm/mach-imx/Kconfig"
435 source "arch/arm/mach-h720x/Kconfig"
437 source "arch/arm/mach-versatile/Kconfig"
439 source "arch/arm/mach-aaec2000/Kconfig"
441 source "arch/arm/mach-realview/Kconfig"
443 source "arch/arm/mach-at91/Kconfig"
445 source "arch/arm/mach-netx/Kconfig"
447 source "arch/arm/mach-ns9xxx/Kconfig"
449 # Definitions to make life easier
456 source arch/arm/mm/Kconfig
459 bool "Enable iWMMXt support"
460 depends on CPU_XSCALE || CPU_XSC3
463 Enable support for iWMMXt context switching at run time if
464 running on a CPU that supports it.
466 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
469 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
473 source "arch/arm/Kconfig-nommu"
478 source "arch/arm/common/Kconfig"
480 config FORCE_MAX_ZONEORDER
493 Find out whether you have ISA slots on your motherboard. ISA is the
494 name of a bus system, i.e. the way the CPU talks to the other stuff
495 inside your box. Other bus systems are PCI, EISA, MicroChannel
496 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
497 newer boards don't support it. If you have ISA, say Y, otherwise N.
499 # Select ISA DMA controller support
504 # Select ISA DMA interface
509 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX
511 Find out whether you have a PCI motherboard. PCI is the name of a
512 bus system, i.e. the way the CPU talks to the other stuff inside
513 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
514 VESA. If you have PCI, say Y, otherwise N.
516 The PCI-HOWTO, available from
517 <http://www.tldp.org/docs.html#howto>, contains valuable
518 information about which PCI hardware does work under Linux and which
521 # Select the host bridge type
522 config PCI_HOST_VIA82C505
524 depends on PCI && ARCH_SHARK
527 source "drivers/pci/Kconfig"
529 source "drivers/pcmcia/Kconfig"
533 menu "Kernel Features"
535 source "kernel/time/Kconfig"
538 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
539 depends on EXPERIMENTAL && REALVIEW_MPCORE
541 This enables support for systems with more than one CPU. If you have
542 a system with only one CPU, like most personal computers, say N. If
543 you have a system with more than one CPU, say Y.
545 If you say N here, the kernel will run on single and multiprocessor
546 machines, but will use only one CPU of a multiprocessor machine. If
547 you say Y here, the kernel will run on many, but not all, single
548 processor machines. On a single processor machine, the kernel will
549 run faster if you say N here.
551 See also the <file:Documentation/smp.txt>,
552 <file:Documentation/i386/IO-APIC.txt>,
553 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
554 <http://www.linuxdoc.org/docs.html#howto>.
556 If you don't know what to do here, say N.
559 int "Maximum number of CPUs (2-32)"
565 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
566 depends on SMP && HOTPLUG && EXPERIMENTAL
568 Say Y here to experiment with turning CPUs off and on. CPUs
569 can be controlled through /sys/devices/system/cpu.
572 bool "Use local timer interrupts"
573 depends on SMP && REALVIEW_MPCORE
576 Enable support for local timers on SMP platforms, rather then the
577 legacy IPI broadcast method. Local timers allows the system
578 accounting to be spread across the timer interval, preventing a
579 "thundering herd" at every timer tick.
582 bool "Preemptible Kernel (EXPERIMENTAL)"
583 depends on EXPERIMENTAL
585 This option reduces the latency of the kernel when reacting to
586 real-time or interactive events by allowing a low priority process to
587 be preempted even if it is in kernel mode executing a system call.
588 This allows applications to run more reliably even when the system is
591 Say Y here if you are building a kernel for a desktop, embedded
592 or real-time system. Say N if you are unsure.
595 bool "Dynamic tick timer"
596 depends on !GENERIC_CLOCKEVENTS
598 Select this option if you want to disable continuous timer ticks
599 and have them programmed to occur as required. This option saves
600 power as the system can remain in idle state for longer.
602 By default dynamic tick is disabled during the boot, and can be
603 manually enabled with:
605 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
607 Alternatively, if you want dynamic tick automatically enabled
608 during boot, pass "dyntick=enable" via the kernel command string.
610 Please note that dynamic tick may affect the accuracy of
611 timekeeping on some platforms depending on the implementation.
612 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
613 to have accurate timekeeping with dynamic tick.
617 default 128 if ARCH_L7200
618 default 200 if ARCH_EBSA110 || ARCH_S3C2410
619 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
623 bool "Use the ARM EABI to compile the kernel"
625 This option allows for the kernel to be compiled using the latest
626 ARM ABI (aka EABI). This is only useful if you are using a user
627 space environment that is also compiled with EABI.
629 Since there are major incompatibilities between the legacy ABI and
630 EABI, especially with regard to structure member alignment, this
631 option also changes the kernel syscall calling convention to
632 disambiguate both ABIs and allow for backward compatibility support
633 (selected with CONFIG_OABI_COMPAT).
635 To use this you need GCC version 4.0.0 or later.
638 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
639 depends on AEABI && EXPERIMENTAL
642 This option preserves the old syscall interface along with the
643 new (ARM EABI) one. It also provides a compatibility layer to
644 intercept syscalls that have structure arguments which layout
645 in memory differs between the legacy ABI and the new ARM EABI
646 (only for non "thumb" binaries). This option adds a tiny
647 overhead to all syscalls and produces a slightly larger kernel.
648 If you know you'll be using only pure EABI user space then you
649 can say N here. If this option is not selected and you attempt
650 to execute a legacy ABI binary then the result will be
651 UNPREDICTABLE (in fact it can be predicted that it won't work
652 at all). If in doubt say Y.
654 config ARCH_DISCONTIGMEM_ENABLE
656 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
658 Say Y to support efficient handling of discontiguous physical memory,
659 for architectures which are either NUMA (Non-Uniform Memory Access)
660 or have huge holes in the physical address space for other reasons.
661 See <file:Documentation/vm/numa> for more.
665 default "4" if ARCH_LH7A40X
667 depends on NEED_MULTIPLE_NODES
672 bool "Timer and CPU usage LEDs"
673 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
674 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
675 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
676 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
677 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
678 ARCH_AT91 || MACH_TRIZEPS4
680 If you say Y here, the LEDs on your machine will be used
681 to provide useful information about your current system status.
683 If you are compiling a kernel for a NetWinder or EBSA-285, you will
684 be able to select which LEDs are active using the options below. If
685 you are compiling a kernel for the EBSA-110 or the LART however, the
686 red LED will simply flash regularly to indicate that the system is
687 still functional. It is safe to say Y here if you have a CATS
688 system, but the driver will do nothing.
691 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
692 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
693 || MACH_OMAP_PERSEUS2
695 depends on !GENERIC_CLOCKEVENTS
696 default y if ARCH_EBSA110
698 If you say Y here, one of the system LEDs (the green one on the
699 NetWinder, the amber one on the EBSA285, or the red one on the LART)
700 will flash regularly to indicate that the system is still
701 operational. This is mainly useful to kernel hackers who are
702 debugging unstable kernels.
704 The LART uses the same LED for both Timer LED and CPU usage LED
705 functions. You may choose to use both, but the Timer LED function
706 will overrule the CPU usage LED.
709 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
711 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
712 || MACH_OMAP_PERSEUS2
715 If you say Y here, the red LED will be used to give a good real
716 time indication of CPU usage, by lighting whenever the idle task
717 is not currently executing.
719 The LART uses the same LED for both Timer LED and CPU usage LED
720 functions. You may choose to use both, but the Timer LED function
721 will overrule the CPU usage LED.
723 config ALIGNMENT_TRAP
725 depends on CPU_CP15_MMU
726 default y if !ARCH_EBSA110
728 ARM processors cannot fetch/store information which is not
729 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
730 address divisible by 4. On 32-bit ARM processors, these non-aligned
731 fetch/store instructions will be emulated in software if you say
732 here, which has a severe performance impact. This is necessary for
733 correct operation of some network protocols. With an IP-only
734 configuration it is safe to say N, otherwise say Y.
740 # Compressed boot loader in ROM. Yes, we really want to ask about
741 # TEXT and BSS so we preserve their values in the config files.
742 config ZBOOT_ROM_TEXT
743 hex "Compressed ROM boot loader base address"
746 The physical address at which the ROM-able zImage is to be
747 placed in the target. Platforms which normally make use of
748 ROM-able zImage formats normally set this to a suitable
749 value in their defconfig file.
751 If ZBOOT_ROM is not enabled, this has no effect.
754 hex "Compressed ROM boot loader BSS address"
757 The base address of an area of read/write memory in the target
758 for the ROM-able zImage which must be available while the
759 decompressor is running. It must be large enough to hold the
760 entire decompressed kernel plus an additional 128 KiB.
761 Platforms which normally make use of ROM-able zImage formats
762 normally set this to a suitable value in their defconfig file.
764 If ZBOOT_ROM is not enabled, this has no effect.
767 bool "Compressed boot loader in ROM/flash"
768 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
770 Say Y here if you intend to execute your compressed kernel image
771 (zImage) directly from ROM or flash. If unsure, say N.
774 string "Default kernel command string"
777 On some architectures (EBSA110 and CATS), there is currently no way
778 for the boot loader to pass arguments to the kernel. For these
779 architectures, you should supply some command-line options at build
780 time by entering them here. As a minimum, you should specify the
781 memory size and the root device (e.g., mem=64M root=/dev/nfs).
784 bool "Kernel Execute-In-Place from ROM"
785 depends on !ZBOOT_ROM
787 Execute-In-Place allows the kernel to run from non-volatile storage
788 directly addressable by the CPU, such as NOR flash. This saves RAM
789 space since the text section of the kernel is not loaded from flash
790 to RAM. Read-write sections, such as the data section and stack,
791 are still copied to RAM. The XIP kernel is not compressed since
792 it has to run directly from flash, so it will take more space to
793 store it. The flash address used to link the kernel object files,
794 and for storing it, is configuration dependent. Therefore, if you
795 say Y here, you must know the proper physical address where to
796 store the kernel image depending on your own flash memory usage.
798 Also note that the make target becomes "make xipImage" rather than
799 "make zImage" or "make Image". The final kernel binary to put in
800 ROM memory will be arch/arm/boot/xipImage.
805 hex "XIP Kernel Physical Location"
806 depends on XIP_KERNEL
809 This is the physical address in your flash memory the kernel will
810 be linked for and stored to. This address is dependent on your
814 bool "Kexec system call (EXPERIMENTAL)"
815 depends on EXPERIMENTAL
817 kexec is a system call that implements the ability to shutdown your
818 current kernel, and to start another kernel. It is like a reboot
819 but it is indepedent of the system firmware. And like a reboot
820 you can start any kernel with it, not just Linux.
822 It is an ongoing process to be certain the hardware in a machine
823 is properly shutdown, so do not be surprised if this code does not
824 initially work for you. It may help to enable device hotplugging
829 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX )
831 menu "CPU Frequency scaling"
833 source "drivers/cpufreq/Kconfig"
835 config CPU_FREQ_SA1100
837 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
840 config CPU_FREQ_SA1110
842 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
845 config CPU_FREQ_INTEGRATOR
846 tristate "CPUfreq driver for ARM Integrator CPUs"
847 depends on ARCH_INTEGRATOR && CPU_FREQ
850 This enables the CPUfreq driver for ARM Integrator CPUs.
852 For details, take a look at <file:Documentation/cpu-freq>.
857 tristate "CPUfreq driver for i.MX CPUs"
858 depends on ARCH_IMX && CPU_FREQ
861 This enables the CPUfreq driver for i.MX CPUs.
869 menu "Floating point emulation"
871 comment "At least one emulation must be selected"
874 bool "NWFPE math emulation"
875 depends on !AEABI || OABI_COMPAT
877 Say Y to include the NWFPE floating point emulator in the kernel.
878 This is necessary to run most binaries. Linux does not currently
879 support floating point hardware so you need to say Y here even if
880 your machine has an FPA or floating point co-processor podule.
882 You may say N here if you are going to load the Acorn FPEmulator
886 bool "Support extended precision"
889 Say Y to include 80-bit support in the kernel floating-point
890 emulator. Otherwise, only 32 and 64-bit support is compiled in.
891 Note that gcc does not generate 80-bit operations by default,
892 so in most cases this option only enlarges the size of the
893 floating point emulator without any good reason.
895 You almost surely want to say N here.
898 bool "FastFPE math emulation (EXPERIMENTAL)"
899 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
901 Say Y here to include the FAST floating point emulator in the kernel.
902 This is an experimental much faster emulator which now also has full
903 precision for the mantissa. It does not support any exceptions.
904 It is very simple, and approximately 3-6 times faster than NWFPE.
906 It should be sufficient for most programs. It may be not suitable
907 for scientific calculations, but you have to check this for yourself.
908 If you do not feel you need a faster FP emulation you should better
912 bool "VFP-format floating point maths"
913 depends on CPU_V6 || CPU_ARM926T
915 Say Y to include VFP support code in the kernel. This is needed
916 if your hardware includes a VFP unit.
918 Please see <file:Documentation/arm/VFP/release-notes.txt> for
919 release notes and additional status information.
921 Say N if your target does not have VFP hardware.
925 menu "Userspace binary formats"
927 source "fs/Kconfig.binfmt"
930 tristate "RISC OS personality"
933 Say Y here to include the kernel code necessary if you want to run
934 Acorn RISC OS/Arthur binaries under Linux. This code is still very
935 experimental; if this sounds frightening, say N and sleep in peace.
936 You can also say M here to compile this support as a module (which
937 will be called arthur).
941 menu "Power management options"
943 source "kernel/power/Kconfig"
949 menu "Device Drivers"
951 source "drivers/base/Kconfig"
953 source "drivers/connector/Kconfig"
955 if ALIGNMENT_TRAP || !CPU_CP15_MMU
956 source "drivers/mtd/Kconfig"
959 source "drivers/parport/Kconfig"
961 source "drivers/pnp/Kconfig"
963 source "drivers/block/Kconfig"
965 source "drivers/acorn/block/Kconfig"
967 if PCMCIA || ARCH_CLPS7500 || ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX \
968 || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
969 || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
971 source "drivers/ide/Kconfig"
974 source "drivers/scsi/Kconfig"
976 source "drivers/ata/Kconfig"
978 source "drivers/md/Kconfig"
980 source "drivers/message/fusion/Kconfig"
982 source "drivers/ieee1394/Kconfig"
984 source "drivers/message/i2o/Kconfig"
986 source "drivers/net/Kconfig"
988 source "drivers/isdn/Kconfig"
990 # input before char - char/joystick depends on it. As does USB.
992 source "drivers/input/Kconfig"
994 source "drivers/char/Kconfig"
996 source "drivers/i2c/Kconfig"
998 source "drivers/spi/Kconfig"
1000 source "drivers/w1/Kconfig"
1002 source "drivers/hwmon/Kconfig"
1004 #source "drivers/l3/Kconfig"
1006 source "drivers/misc/Kconfig"
1008 source "drivers/mfd/Kconfig"
1010 source "drivers/leds/Kconfig"
1012 source "drivers/media/Kconfig"
1014 source "drivers/video/Kconfig"
1016 source "sound/Kconfig"
1018 source "drivers/hid/Kconfig"
1020 source "drivers/usb/Kconfig"
1022 source "drivers/mmc/Kconfig"
1024 source "drivers/rtc/Kconfig"
1027 source "drivers/cbus/Kconfig"
1034 source "arch/arm/oprofile/Kconfig"
1036 source "arch/arm/Kconfig.debug"
1038 source "security/Kconfig"
1040 source "crypto/Kconfig"
1042 source "lib/Kconfig"