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 select HAVE_KPROBES if (!XIP_KERNEL)
15 select HAVE_KRETPROBES if (HAVE_KPROBES)
17 The ARM series is a line of low-power-consumption RISC chip designs
18 licensed by ARM Ltd and targeted at embedded applications and
19 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
20 manufactured, but legacy ARM-based PC hardware remains popular in
21 Europe. There is an ARM Linux project with a web page at
22 <http://www.arm.linux.org.uk/>.
24 config SYS_SUPPORTS_APM_EMULATION
35 config GENERIC_CLOCKEVENTS
39 config GENERIC_CLOCKEVENTS_BROADCAST
41 depends on GENERIC_CLOCKEVENTS
42 default y if SMP && !LOCAL_TIMERS
55 The Extended Industry Standard Architecture (EISA) bus was
56 developed as an open alternative to the IBM MicroChannel bus.
58 The EISA bus provided some of the features of the IBM MicroChannel
59 bus while maintaining backward compatibility with cards made for
60 the older ISA bus. The EISA bus saw limited use between 1988 and
61 1995 when it was made obsolete by the PCI bus.
63 Say Y here if you are building a kernel for an EISA-based machine.
73 MicroChannel Architecture is found in some IBM PS/2 machines and
74 laptops. It is a bus system similar to PCI or ISA. See
75 <file:Documentation/mca.txt> (and especially the web page given
76 there) before attempting to build an MCA bus kernel.
78 config GENERIC_HARDIRQS
82 config STACKTRACE_SUPPORT
86 config LOCKDEP_SUPPORT
90 config TRACE_IRQFLAGS_SUPPORT
94 config HARDIRQS_SW_RESEND
98 config GENERIC_IRQ_PROBE
102 config GENERIC_LOCKBREAK
105 depends on SMP && PREEMPT
107 config RWSEM_GENERIC_SPINLOCK
111 config RWSEM_XCHGADD_ALGORITHM
114 config ARCH_HAS_ILOG2_U32
118 config ARCH_HAS_ILOG2_U64
122 config GENERIC_HWEIGHT
126 config GENERIC_CALIBRATE_DELAY
130 config ARCH_SUPPORTS_AOUT
133 config ARCH_MAY_HAVE_PC_FDC
140 config GENERIC_ISA_DMA
151 config OPROFILE_ARMV6
153 depends on CPU_V6 && !SMP
154 select OPROFILE_ARM11_CORE
156 config OPROFILE_MPCORE
158 depends on CPU_V6 && SMP
159 select OPROFILE_ARM11_CORE
161 config OPROFILE_ARM11_CORE
168 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
169 default DRAM_BASE if REMAP_VECTORS_TO_RAM
172 The base address of exception vectors.
174 source "init/Kconfig"
179 prompt "ARM system type"
180 default ARCH_VERSATILE
183 bool "Agilent AAEC-2000 based"
186 This enables support for systems based on the Agilent AAEC-2000
188 config ARCH_INTEGRATOR
189 bool "ARM Ltd. Integrator family"
193 Support for ARM's Integrator platform.
196 bool "ARM Ltd. RealView family"
200 select GENERIC_CLOCKEVENTS
202 This enables support for ARM Ltd RealView boards.
204 config ARCH_VERSATILE
205 bool "ARM Ltd. Versatile family"
210 select GENERIC_CLOCKEVENTS
212 This enables support for ARM Ltd Versatile board.
218 This enables support for systems based on the Atmel AT91RM9200,
219 AT91SAM9 and AT91CAP9 processors.
222 bool "Cirrus CL-PS7500FE"
228 Support for the Cirrus Logic PS7500FE system-on-a-chip.
231 bool "Cirrus Logic CLPS711x/EP721x-based"
233 Support for Cirrus Logic 711x/721x based boards.
238 select FOOTBRIDGE_ADDIN
241 Support for Intel's EBSA285 companion chip.
248 This is an evaluation board for the StrongARM processor available
249 from Digital. It has limited hardware on-board, including an
250 Ethernet interface, two PCMCIA sockets, two serial ports and a
259 This enables support for the Cirrus EP93xx series of CPUs.
261 config ARCH_FOOTBRIDGE
266 Support for systems based on the DC21285 companion chip
267 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
270 bool "Hilscher NetX based"
273 This enables support for systems based on the Hilscher NetX Soc
276 bool "Hynix HMS720x-based"
279 This enables support for systems based on the Hynix HMS720x
285 select GENERIC_CLOCKEVENTS
287 Support for Motorola's i.MX family of processors (MX1, MXL).
294 select ARCH_SUPPORTS_MSI
296 Support for Intel's IOP13XX (XScale) family of processors.
305 Support for Intel's 80219 and IOP32X (XScale) family of
315 Support for Intel's IOP33X (XScale) family of processors.
323 Support for Intel's IXP23xx (XScale) family of processors.
326 bool "IXP2400/2800-based"
330 Support for Intel's IXP2400/2800 (XScale) family of processors.
337 select GENERIC_CLOCKEVENTS
340 Support for Intel's IXP4XX (XScale) family of processors.
347 Say Y here if you intend to run this kernel on a LinkUp Systems
348 L7200 Software Development Board which uses an ARM720T processor.
349 Information on this board can be obtained at:
351 <http://www.linkupsys.com/>
353 If you have any questions or comments about the Linux kernel port
354 to this board, send e-mail to <sjhill@cotw.com>.
357 bool "Micrel/Kendin KS8695"
360 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
361 System-on-Chip devices.
364 bool "NetSilicon NS9xxx"
367 select GENERIC_CLOCKEVENTS
369 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
372 <http://www.digi.com/products/microprocessors/index.jsp>
375 bool "Freescale MXC/iMX-based"
378 Support for Freescale MXC/iMX-based family of processors
386 select GENERIC_CLOCKEVENTS
388 Support for Marvell Orion System on Chip family.
391 bool "Philips Nexperia PNX4008 Mobile"
393 This enables support for Philips PNX4008 mobile platform.
396 bool "PXA2xx/PXA3xx-based"
403 select GENERIC_CLOCKEVENTS
406 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
413 select ARCH_MAY_HAVE_PC_FDC
418 On the Acorn Risc-PC, Linux can support the internal IDE disk and
419 CD-ROM interface, serial and parallel port, and the floppy drive.
424 select ARCH_DISCONTIGMEM_ENABLE
430 Support for StrongARM 11x0 based boards.
433 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
437 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
438 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
439 the Samsung SMDK2410 development board (and derivatives).
448 Support for the StrongARM based Digital DNARD machine, also known
449 as "Shark" (<http://www.shark-linux.de/shark.html>).
455 Say Y here for systems based on one of the Sharp LH7A40X
456 System on a Chip processors. These CPUs include an ARM922T
457 core with a wide array of integrated devices for
458 hand-held and low-power applications.
463 select GENERIC_CLOCKEVENTS
466 Support for TI's DaVinci platform.
472 select GENERIC_CLOCKEVENTS
474 Support for TI's OMAP platform (OMAP1 and OMAP2).
477 bool "Qualcomm MSM7X00A"
479 select GENERIC_CLOCKEVENTS
481 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
482 apps processor of the MSM7X00A and depends on a shared memory
483 interface to the ARM9 modem processor which runs the baseband stack
484 and controls some vital subsystems (clock and power control, etc).
485 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
489 source "arch/arm/mach-clps711x/Kconfig"
491 source "arch/arm/mach-ep93xx/Kconfig"
493 source "arch/arm/mach-footbridge/Kconfig"
495 source "arch/arm/mach-integrator/Kconfig"
497 source "arch/arm/mach-iop32x/Kconfig"
499 source "arch/arm/mach-iop33x/Kconfig"
501 source "arch/arm/mach-iop13xx/Kconfig"
503 source "arch/arm/mach-ixp4xx/Kconfig"
505 source "arch/arm/mach-ixp2000/Kconfig"
507 source "arch/arm/mach-ixp23xx/Kconfig"
509 source "arch/arm/mach-pxa/Kconfig"
511 source "arch/arm/mach-sa1100/Kconfig"
513 source "arch/arm/plat-omap/Kconfig"
515 source "arch/arm/mach-omap1/Kconfig"
517 source "arch/arm/mach-omap2/Kconfig"
519 source "arch/arm/mach-orion/Kconfig"
521 source "arch/arm/plat-s3c24xx/Kconfig"
522 source "arch/arm/plat-s3c/Kconfig"
525 source "arch/arm/mach-s3c2400/Kconfig"
526 source "arch/arm/mach-s3c2410/Kconfig"
527 source "arch/arm/mach-s3c2412/Kconfig"
528 source "arch/arm/mach-s3c2440/Kconfig"
529 source "arch/arm/mach-s3c2442/Kconfig"
530 source "arch/arm/mach-s3c2443/Kconfig"
533 source "arch/arm/mach-lh7a40x/Kconfig"
535 source "arch/arm/mach-imx/Kconfig"
537 source "arch/arm/mach-h720x/Kconfig"
539 source "arch/arm/mach-versatile/Kconfig"
541 source "arch/arm/mach-aaec2000/Kconfig"
543 source "arch/arm/mach-realview/Kconfig"
545 source "arch/arm/mach-at91/Kconfig"
547 source "arch/arm/plat-mxc/Kconfig"
549 source "arch/arm/mach-netx/Kconfig"
551 source "arch/arm/mach-ns9xxx/Kconfig"
553 source "arch/arm/mach-davinci/Kconfig"
555 source "arch/arm/mach-ks8695/Kconfig"
557 source "arch/arm/mach-msm/Kconfig"
559 # Definitions to make life easier
566 source arch/arm/mm/Kconfig
569 bool "Enable iWMMXt support"
570 depends on CPU_XSCALE || CPU_XSC3
571 default y if PXA27x || PXA3xx
573 Enable support for iWMMXt context switching at run time if
574 running on a CPU that supports it.
576 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
579 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
583 source "arch/arm/Kconfig-nommu"
588 source "arch/arm/common/Kconfig"
590 config FORCE_MAX_ZONEORDER
603 Find out whether you have ISA slots on your motherboard. ISA is the
604 name of a bus system, i.e. the way the CPU talks to the other stuff
605 inside your box. Other bus systems are PCI, EISA, MicroChannel
606 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
607 newer boards don't support it. If you have ISA, say Y, otherwise N.
609 # Select ISA DMA controller support
614 # Select ISA DMA interface
619 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
621 Find out whether you have a PCI motherboard. PCI is the name of a
622 bus system, i.e. the way the CPU talks to the other stuff inside
623 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
624 VESA. If you have PCI, say Y, otherwise N.
629 # Select the host bridge type
630 config PCI_HOST_VIA82C505
632 depends on PCI && ARCH_SHARK
635 config PCI_HOST_ITE8152
637 depends on PCI && MACH_ARMCORE
641 source "drivers/pci/Kconfig"
643 source "drivers/pcmcia/Kconfig"
647 menu "Kernel Features"
649 source "kernel/time/Kconfig"
652 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
653 depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
655 This enables support for systems with more than one CPU. If you have
656 a system with only one CPU, like most personal computers, say N. If
657 you have a system with more than one CPU, say Y.
659 If you say N here, the kernel will run on single and multiprocessor
660 machines, but will use only one CPU of a multiprocessor machine. If
661 you say Y here, the kernel will run on many, but not all, single
662 processor machines. On a single processor machine, the kernel will
663 run faster if you say N here.
665 See also <file:Documentation/i386/IO-APIC.txt>,
666 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
667 <http://www.linuxdoc.org/docs.html#howto>.
669 If you don't know what to do here, say N.
672 int "Maximum number of CPUs (2-32)"
678 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
679 depends on SMP && HOTPLUG && EXPERIMENTAL
681 Say Y here to experiment with turning CPUs off and on. CPUs
682 can be controlled through /sys/devices/system/cpu.
685 bool "Use local timer interrupts"
686 depends on SMP && REALVIEW_EB_ARM11MP
689 Enable support for local timers on SMP platforms, rather then the
690 legacy IPI broadcast method. Local timers allows the system
691 accounting to be spread across the timer interval, preventing a
692 "thundering herd" at every timer tick.
695 bool "Preemptible Kernel (EXPERIMENTAL)"
696 depends on EXPERIMENTAL
698 This option reduces the latency of the kernel when reacting to
699 real-time or interactive events by allowing a low priority process to
700 be preempted even if it is in kernel mode executing a system call.
701 This allows applications to run more reliably even when the system is
704 Say Y here if you are building a kernel for a desktop, embedded
705 or real-time system. Say N if you are unsure.
708 bool "Dynamic tick timer"
709 depends on !GENERIC_CLOCKEVENTS
711 Select this option if you want to disable continuous timer ticks
712 and have them programmed to occur as required. This option saves
713 power as the system can remain in idle state for longer.
715 By default dynamic tick is disabled during the boot, and can be
716 manually enabled with:
718 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
720 Alternatively, if you want dynamic tick automatically enabled
721 during boot, pass "dyntick=enable" via the kernel command string.
723 Please note that dynamic tick may affect the accuracy of
724 timekeeping on some platforms depending on the implementation.
725 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
726 to have accurate timekeeping with dynamic tick.
730 default 128 if ARCH_L7200
731 default 200 if ARCH_EBSA110 || ARCH_S3C2410
732 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
733 default AT91_TIMER_HZ if ARCH_AT91
737 bool "Use the ARM EABI to compile the kernel"
739 This option allows for the kernel to be compiled using the latest
740 ARM ABI (aka EABI). This is only useful if you are using a user
741 space environment that is also compiled with EABI.
743 Since there are major incompatibilities between the legacy ABI and
744 EABI, especially with regard to structure member alignment, this
745 option also changes the kernel syscall calling convention to
746 disambiguate both ABIs and allow for backward compatibility support
747 (selected with CONFIG_OABI_COMPAT).
749 To use this you need GCC version 4.0.0 or later.
752 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
753 depends on AEABI && EXPERIMENTAL
756 This option preserves the old syscall interface along with the
757 new (ARM EABI) one. It also provides a compatibility layer to
758 intercept syscalls that have structure arguments which layout
759 in memory differs between the legacy ABI and the new ARM EABI
760 (only for non "thumb" binaries). This option adds a tiny
761 overhead to all syscalls and produces a slightly larger kernel.
762 If you know you'll be using only pure EABI user space then you
763 can say N here. If this option is not selected and you attempt
764 to execute a legacy ABI binary then the result will be
765 UNPREDICTABLE (in fact it can be predicted that it won't work
766 at all). If in doubt say Y.
768 config ARCH_DISCONTIGMEM_ENABLE
770 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
772 Say Y to support efficient handling of discontiguous physical memory,
773 for architectures which are either NUMA (Non-Uniform Memory Access)
774 or have huge holes in the physical address space for other reasons.
775 See <file:Documentation/vm/numa> for more.
779 default "4" if ARCH_LH7A40X
781 depends on NEED_MULTIPLE_NODES
786 bool "Timer and CPU usage LEDs"
787 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
788 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
789 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
790 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
791 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
792 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
793 ARCH_KS8695 || MACH_RD88F5182
795 If you say Y here, the LEDs on your machine will be used
796 to provide useful information about your current system status.
798 If you are compiling a kernel for a NetWinder or EBSA-285, you will
799 be able to select which LEDs are active using the options below. If
800 you are compiling a kernel for the EBSA-110 or the LART however, the
801 red LED will simply flash regularly to indicate that the system is
802 still functional. It is safe to say Y here if you have a CATS
803 system, but the driver will do nothing.
806 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
807 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
808 || MACH_OMAP_PERSEUS2
810 depends on !GENERIC_CLOCKEVENTS
811 default y if ARCH_EBSA110
813 If you say Y here, one of the system LEDs (the green one on the
814 NetWinder, the amber one on the EBSA285, or the red one on the LART)
815 will flash regularly to indicate that the system is still
816 operational. This is mainly useful to kernel hackers who are
817 debugging unstable kernels.
819 The LART uses the same LED for both Timer LED and CPU usage LED
820 functions. You may choose to use both, but the Timer LED function
821 will overrule the CPU usage LED.
824 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
826 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
827 || MACH_OMAP_PERSEUS2
830 If you say Y here, the red LED will be used to give a good real
831 time indication of CPU usage, by lighting whenever the idle task
832 is not currently executing.
834 The LART uses the same LED for both Timer LED and CPU usage LED
835 functions. You may choose to use both, but the Timer LED function
836 will overrule the CPU usage LED.
838 config ALIGNMENT_TRAP
840 depends on CPU_CP15_MMU
841 default y if !ARCH_EBSA110
843 ARM processors cannot fetch/store information which is not
844 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
845 address divisible by 4. On 32-bit ARM processors, these non-aligned
846 fetch/store instructions will be emulated in software if you say
847 here, which has a severe performance impact. This is necessary for
848 correct operation of some network protocols. With an IP-only
849 configuration it is safe to say N, otherwise say Y.
855 # Compressed boot loader in ROM. Yes, we really want to ask about
856 # TEXT and BSS so we preserve their values in the config files.
857 config ZBOOT_ROM_TEXT
858 hex "Compressed ROM boot loader base address"
861 The physical address at which the ROM-able zImage is to be
862 placed in the target. Platforms which normally make use of
863 ROM-able zImage formats normally set this to a suitable
864 value in their defconfig file.
866 If ZBOOT_ROM is not enabled, this has no effect.
869 hex "Compressed ROM boot loader BSS address"
872 The base address of an area of read/write memory in the target
873 for the ROM-able zImage which must be available while the
874 decompressor is running. It must be large enough to hold the
875 entire decompressed kernel plus an additional 128 KiB.
876 Platforms which normally make use of ROM-able zImage formats
877 normally set this to a suitable value in their defconfig file.
879 If ZBOOT_ROM is not enabled, this has no effect.
882 bool "Compressed boot loader in ROM/flash"
883 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
885 Say Y here if you intend to execute your compressed kernel image
886 (zImage) directly from ROM or flash. If unsure, say N.
889 string "Default kernel command string"
892 On some architectures (EBSA110 and CATS), there is currently no way
893 for the boot loader to pass arguments to the kernel. For these
894 architectures, you should supply some command-line options at build
895 time by entering them here. As a minimum, you should specify the
896 memory size and the root device (e.g., mem=64M root=/dev/nfs).
899 bool "Kernel Execute-In-Place from ROM"
900 depends on !ZBOOT_ROM
902 Execute-In-Place allows the kernel to run from non-volatile storage
903 directly addressable by the CPU, such as NOR flash. This saves RAM
904 space since the text section of the kernel is not loaded from flash
905 to RAM. Read-write sections, such as the data section and stack,
906 are still copied to RAM. The XIP kernel is not compressed since
907 it has to run directly from flash, so it will take more space to
908 store it. The flash address used to link the kernel object files,
909 and for storing it, is configuration dependent. Therefore, if you
910 say Y here, you must know the proper physical address where to
911 store the kernel image depending on your own flash memory usage.
913 Also note that the make target becomes "make xipImage" rather than
914 "make zImage" or "make Image". The final kernel binary to put in
915 ROM memory will be arch/arm/boot/xipImage.
920 hex "XIP Kernel Physical Location"
921 depends on XIP_KERNEL
924 This is the physical address in your flash memory the kernel will
925 be linked for and stored to. This address is dependent on your
929 bool "Kexec system call (EXPERIMENTAL)"
930 depends on EXPERIMENTAL
932 kexec is a system call that implements the ability to shutdown your
933 current kernel, and to start another kernel. It is like a reboot
934 but it is independent of the system firmware. And like a reboot
935 you can start any kernel with it, not just Linux.
937 It is an ongoing process to be certain the hardware in a machine
938 is properly shutdown, so do not be surprised if this code does not
939 initially work for you. It may help to enable device hotplugging
943 bool "Export atags in procfs"
947 Should the atags used to boot the kernel be exported in an "atags"
948 file in procfs. Useful with kexec.
952 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
954 menu "CPU Frequency scaling"
956 source "drivers/cpufreq/Kconfig"
958 config CPU_FREQ_SA1100
960 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
963 config CPU_FREQ_SA1110
965 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
968 config CPU_FREQ_INTEGRATOR
969 tristate "CPUfreq driver for ARM Integrator CPUs"
970 depends on ARCH_INTEGRATOR && CPU_FREQ
973 This enables the CPUfreq driver for ARM Integrator CPUs.
975 For details, take a look at <file:Documentation/cpu-freq>.
980 tristate "CPUfreq driver for i.MX CPUs"
981 depends on ARCH_IMX && CPU_FREQ
984 This enables the CPUfreq driver for i.MX CPUs.
990 depends on CPU_FREQ && ARCH_PXA && PXA25x
992 select CPU_FREQ_DEFAULT_GOV_USERSPACE
998 menu "Floating point emulation"
1000 comment "At least one emulation must be selected"
1003 bool "NWFPE math emulation"
1004 depends on !AEABI || OABI_COMPAT
1006 Say Y to include the NWFPE floating point emulator in the kernel.
1007 This is necessary to run most binaries. Linux does not currently
1008 support floating point hardware so you need to say Y here even if
1009 your machine has an FPA or floating point co-processor podule.
1011 You may say N here if you are going to load the Acorn FPEmulator
1012 early in the bootup.
1015 bool "Support extended precision"
1016 depends on FPE_NWFPE
1018 Say Y to include 80-bit support in the kernel floating-point
1019 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1020 Note that gcc does not generate 80-bit operations by default,
1021 so in most cases this option only enlarges the size of the
1022 floating point emulator without any good reason.
1024 You almost surely want to say N here.
1027 bool "FastFPE math emulation (EXPERIMENTAL)"
1028 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1030 Say Y here to include the FAST floating point emulator in the kernel.
1031 This is an experimental much faster emulator which now also has full
1032 precision for the mantissa. It does not support any exceptions.
1033 It is very simple, and approximately 3-6 times faster than NWFPE.
1035 It should be sufficient for most programs. It may be not suitable
1036 for scientific calculations, but you have to check this for yourself.
1037 If you do not feel you need a faster FP emulation you should better
1041 bool "VFP-format floating point maths"
1042 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1044 Say Y to include VFP support code in the kernel. This is needed
1045 if your hardware includes a VFP unit.
1047 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1048 release notes and additional status information.
1050 Say N if your target does not have VFP hardware.
1058 bool "Advanced SIMD (NEON) Extension support"
1059 depends on VFPv3 && CPU_V7
1061 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1066 menu "Userspace binary formats"
1068 source "fs/Kconfig.binfmt"
1071 tristate "RISC OS personality"
1074 Say Y here to include the kernel code necessary if you want to run
1075 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1076 experimental; if this sounds frightening, say N and sleep in peace.
1077 You can also say M here to compile this support as a module (which
1078 will be called arthur).
1082 menu "Power management options"
1084 source "kernel/power/Kconfig"
1086 config ARCH_SUSPEND_POSSIBLE
1091 source "net/Kconfig"
1093 menu "Device Drivers"
1095 source "drivers/base/Kconfig"
1097 source "drivers/connector/Kconfig"
1099 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1100 source "drivers/mtd/Kconfig"
1103 source "drivers/parport/Kconfig"
1105 source "drivers/pnp/Kconfig"
1107 source "drivers/block/Kconfig"
1109 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1111 source "drivers/misc/Kconfig"
1113 source "drivers/ide/Kconfig"
1115 source "drivers/scsi/Kconfig"
1117 source "drivers/ata/Kconfig"
1119 source "drivers/md/Kconfig"
1121 source "drivers/message/fusion/Kconfig"
1123 source "drivers/ieee1394/Kconfig"
1125 source "drivers/message/i2o/Kconfig"
1127 source "drivers/net/Kconfig"
1129 source "drivers/isdn/Kconfig"
1131 # input before char - char/joystick depends on it. As does USB.
1133 source "drivers/input/Kconfig"
1135 source "drivers/char/Kconfig"
1137 source "drivers/i2c/Kconfig"
1139 source "drivers/spi/Kconfig"
1141 source "drivers/gpio/Kconfig"
1143 source "drivers/w1/Kconfig"
1145 source "drivers/power/Kconfig"
1147 source "drivers/hwmon/Kconfig"
1149 source "drivers/watchdog/Kconfig"
1151 source "drivers/ssb/Kconfig"
1153 #source "drivers/l3/Kconfig"
1155 source "drivers/mfd/Kconfig"
1157 source "drivers/media/Kconfig"
1159 source "drivers/video/Kconfig"
1161 source "sound/Kconfig"
1163 source "drivers/hid/Kconfig"
1165 source "drivers/usb/Kconfig"
1167 source "drivers/mmc/Kconfig"
1169 source "drivers/leds/Kconfig"
1171 source "drivers/rtc/Kconfig"
1173 source "drivers/dma/Kconfig"
1175 source "drivers/dca/Kconfig"
1181 source "arch/arm/Kconfig.debug"
1183 source "security/Kconfig"
1185 source "crypto/Kconfig"
1187 source "lib/Kconfig"