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
389 Support for Marvell Orion System on Chip family.
392 bool "Philips Nexperia PNX4008 Mobile"
394 This enables support for Philips PNX4008 mobile platform.
397 bool "PXA2xx/PXA3xx-based"
404 select GENERIC_CLOCKEVENTS
407 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
414 select ARCH_MAY_HAVE_PC_FDC
419 On the Acorn Risc-PC, Linux can support the internal IDE disk and
420 CD-ROM interface, serial and parallel port, and the floppy drive.
425 select ARCH_DISCONTIGMEM_ENABLE
431 Support for StrongARM 11x0 based boards.
434 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
438 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
439 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
440 the Samsung SMDK2410 development board (and derivatives).
449 Support for the StrongARM based Digital DNARD machine, also known
450 as "Shark" (<http://www.shark-linux.de/shark.html>).
456 Say Y here for systems based on one of the Sharp LH7A40X
457 System on a Chip processors. These CPUs include an ARM922T
458 core with a wide array of integrated devices for
459 hand-held and low-power applications.
464 select GENERIC_CLOCKEVENTS
467 Support for TI's DaVinci platform.
473 select GENERIC_CLOCKEVENTS
475 Support for TI's OMAP platform (OMAP1 and OMAP2).
478 bool "Qualcomm MSM7X00A"
480 select GENERIC_CLOCKEVENTS
482 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
483 apps processor of the MSM7X00A and depends on a shared memory
484 interface to the ARM9 modem processor which runs the baseband stack
485 and controls some vital subsystems (clock and power control, etc).
486 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
490 source "arch/arm/mach-clps711x/Kconfig"
492 source "arch/arm/mach-ep93xx/Kconfig"
494 source "arch/arm/mach-footbridge/Kconfig"
496 source "arch/arm/mach-integrator/Kconfig"
498 source "arch/arm/mach-iop32x/Kconfig"
500 source "arch/arm/mach-iop33x/Kconfig"
502 source "arch/arm/mach-iop13xx/Kconfig"
504 source "arch/arm/mach-ixp4xx/Kconfig"
506 source "arch/arm/mach-ixp2000/Kconfig"
508 source "arch/arm/mach-ixp23xx/Kconfig"
510 source "arch/arm/mach-pxa/Kconfig"
512 source "arch/arm/mach-sa1100/Kconfig"
514 source "arch/arm/plat-omap/Kconfig"
516 source "arch/arm/mach-omap1/Kconfig"
518 source "arch/arm/mach-omap2/Kconfig"
520 source "arch/arm/mach-orion/Kconfig"
522 source "arch/arm/plat-s3c24xx/Kconfig"
523 source "arch/arm/plat-s3c/Kconfig"
526 source "arch/arm/mach-s3c2400/Kconfig"
527 source "arch/arm/mach-s3c2410/Kconfig"
528 source "arch/arm/mach-s3c2412/Kconfig"
529 source "arch/arm/mach-s3c2440/Kconfig"
530 source "arch/arm/mach-s3c2442/Kconfig"
531 source "arch/arm/mach-s3c2443/Kconfig"
534 source "arch/arm/mach-lh7a40x/Kconfig"
536 source "arch/arm/mach-imx/Kconfig"
538 source "arch/arm/mach-h720x/Kconfig"
540 source "arch/arm/mach-versatile/Kconfig"
542 source "arch/arm/mach-aaec2000/Kconfig"
544 source "arch/arm/mach-realview/Kconfig"
546 source "arch/arm/mach-at91/Kconfig"
548 source "arch/arm/plat-mxc/Kconfig"
550 source "arch/arm/mach-netx/Kconfig"
552 source "arch/arm/mach-ns9xxx/Kconfig"
554 source "arch/arm/mach-davinci/Kconfig"
556 source "arch/arm/mach-ks8695/Kconfig"
558 source "arch/arm/mach-msm/Kconfig"
560 # Definitions to make life easier
570 source arch/arm/mm/Kconfig
573 bool "Enable iWMMXt support"
574 depends on CPU_XSCALE || CPU_XSC3
575 default y if PXA27x || PXA3xx
577 Enable support for iWMMXt context switching at run time if
578 running on a CPU that supports it.
580 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
583 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
587 source "arch/arm/Kconfig-nommu"
592 source "arch/arm/common/Kconfig"
594 config FORCE_MAX_ZONEORDER
607 Find out whether you have ISA slots on your motherboard. ISA is the
608 name of a bus system, i.e. the way the CPU talks to the other stuff
609 inside your box. Other bus systems are PCI, EISA, MicroChannel
610 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
611 newer boards don't support it. If you have ISA, say Y, otherwise N.
613 # Select ISA DMA controller support
618 # Select ISA DMA interface
623 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
625 Find out whether you have a PCI motherboard. PCI is the name of a
626 bus system, i.e. the way the CPU talks to the other stuff inside
627 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
628 VESA. If you have PCI, say Y, otherwise N.
633 # Select the host bridge type
634 config PCI_HOST_VIA82C505
636 depends on PCI && ARCH_SHARK
639 config PCI_HOST_ITE8152
641 depends on PCI && MACH_ARMCORE
645 source "drivers/pci/Kconfig"
647 source "drivers/pcmcia/Kconfig"
651 menu "Kernel Features"
653 source "kernel/time/Kconfig"
656 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
657 depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
659 This enables support for systems with more than one CPU. If you have
660 a system with only one CPU, like most personal computers, say N. If
661 you have a system with more than one CPU, say Y.
663 If you say N here, the kernel will run on single and multiprocessor
664 machines, but will use only one CPU of a multiprocessor machine. If
665 you say Y here, the kernel will run on many, but not all, single
666 processor machines. On a single processor machine, the kernel will
667 run faster if you say N here.
669 See also <file:Documentation/i386/IO-APIC.txt>,
670 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
671 <http://www.linuxdoc.org/docs.html#howto>.
673 If you don't know what to do here, say N.
676 int "Maximum number of CPUs (2-32)"
682 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
683 depends on SMP && HOTPLUG && EXPERIMENTAL
685 Say Y here to experiment with turning CPUs off and on. CPUs
686 can be controlled through /sys/devices/system/cpu.
689 bool "Use local timer interrupts"
690 depends on SMP && REALVIEW_EB_ARM11MP
693 Enable support for local timers on SMP platforms, rather then the
694 legacy IPI broadcast method. Local timers allows the system
695 accounting to be spread across the timer interval, preventing a
696 "thundering herd" at every timer tick.
699 bool "Preemptible Kernel (EXPERIMENTAL)"
700 depends on EXPERIMENTAL
702 This option reduces the latency of the kernel when reacting to
703 real-time or interactive events by allowing a low priority process to
704 be preempted even if it is in kernel mode executing a system call.
705 This allows applications to run more reliably even when the system is
708 Say Y here if you are building a kernel for a desktop, embedded
709 or real-time system. Say N if you are unsure.
712 bool "Dynamic tick timer"
713 depends on !GENERIC_CLOCKEVENTS
715 Select this option if you want to disable continuous timer ticks
716 and have them programmed to occur as required. This option saves
717 power as the system can remain in idle state for longer.
719 By default dynamic tick is disabled during the boot, and can be
720 manually enabled with:
722 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
724 Alternatively, if you want dynamic tick automatically enabled
725 during boot, pass "dyntick=enable" via the kernel command string.
727 Please note that dynamic tick may affect the accuracy of
728 timekeeping on some platforms depending on the implementation.
729 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
730 to have accurate timekeeping with dynamic tick.
734 default 128 if ARCH_L7200
735 default 200 if ARCH_EBSA110 || ARCH_S3C2410
736 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
737 default AT91_TIMER_HZ if ARCH_AT91
741 bool "Use the ARM EABI to compile the kernel"
743 This option allows for the kernel to be compiled using the latest
744 ARM ABI (aka EABI). This is only useful if you are using a user
745 space environment that is also compiled with EABI.
747 Since there are major incompatibilities between the legacy ABI and
748 EABI, especially with regard to structure member alignment, this
749 option also changes the kernel syscall calling convention to
750 disambiguate both ABIs and allow for backward compatibility support
751 (selected with CONFIG_OABI_COMPAT).
753 To use this you need GCC version 4.0.0 or later.
756 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
757 depends on AEABI && EXPERIMENTAL
760 This option preserves the old syscall interface along with the
761 new (ARM EABI) one. It also provides a compatibility layer to
762 intercept syscalls that have structure arguments which layout
763 in memory differs between the legacy ABI and the new ARM EABI
764 (only for non "thumb" binaries). This option adds a tiny
765 overhead to all syscalls and produces a slightly larger kernel.
766 If you know you'll be using only pure EABI user space then you
767 can say N here. If this option is not selected and you attempt
768 to execute a legacy ABI binary then the result will be
769 UNPREDICTABLE (in fact it can be predicted that it won't work
770 at all). If in doubt say Y.
772 config ARCH_DISCONTIGMEM_ENABLE
774 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
776 Say Y to support efficient handling of discontiguous physical memory,
777 for architectures which are either NUMA (Non-Uniform Memory Access)
778 or have huge holes in the physical address space for other reasons.
779 See <file:Documentation/vm/numa> for more.
783 default "4" if ARCH_LH7A40X
785 depends on NEED_MULTIPLE_NODES
790 bool "Timer and CPU usage LEDs"
791 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
792 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
793 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
794 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
795 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
796 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
797 ARCH_KS8695 || MACH_RD88F5182
799 If you say Y here, the LEDs on your machine will be used
800 to provide useful information about your current system status.
802 If you are compiling a kernel for a NetWinder or EBSA-285, you will
803 be able to select which LEDs are active using the options below. If
804 you are compiling a kernel for the EBSA-110 or the LART however, the
805 red LED will simply flash regularly to indicate that the system is
806 still functional. It is safe to say Y here if you have a CATS
807 system, but the driver will do nothing.
810 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
811 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
812 || MACH_OMAP_PERSEUS2
814 depends on !GENERIC_CLOCKEVENTS
815 default y if ARCH_EBSA110
817 If you say Y here, one of the system LEDs (the green one on the
818 NetWinder, the amber one on the EBSA285, or the red one on the LART)
819 will flash regularly to indicate that the system is still
820 operational. This is mainly useful to kernel hackers who are
821 debugging unstable kernels.
823 The LART uses the same LED for both Timer LED and CPU usage LED
824 functions. You may choose to use both, but the Timer LED function
825 will overrule the CPU usage LED.
828 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
830 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
831 || MACH_OMAP_PERSEUS2
834 If you say Y here, the red LED will be used to give a good real
835 time indication of CPU usage, by lighting whenever the idle task
836 is not currently executing.
838 The LART uses the same LED for both Timer LED and CPU usage LED
839 functions. You may choose to use both, but the Timer LED function
840 will overrule the CPU usage LED.
842 config ALIGNMENT_TRAP
844 depends on CPU_CP15_MMU
845 default y if !ARCH_EBSA110
847 ARM processors cannot fetch/store information which is not
848 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
849 address divisible by 4. On 32-bit ARM processors, these non-aligned
850 fetch/store instructions will be emulated in software if you say
851 here, which has a severe performance impact. This is necessary for
852 correct operation of some network protocols. With an IP-only
853 configuration it is safe to say N, otherwise say Y.
859 # Compressed boot loader in ROM. Yes, we really want to ask about
860 # TEXT and BSS so we preserve their values in the config files.
861 config ZBOOT_ROM_TEXT
862 hex "Compressed ROM boot loader base address"
865 The physical address at which the ROM-able zImage is to be
866 placed in the target. Platforms which normally make use of
867 ROM-able zImage formats normally set this to a suitable
868 value in their defconfig file.
870 If ZBOOT_ROM is not enabled, this has no effect.
873 hex "Compressed ROM boot loader BSS address"
876 The base address of an area of read/write memory in the target
877 for the ROM-able zImage which must be available while the
878 decompressor is running. It must be large enough to hold the
879 entire decompressed kernel plus an additional 128 KiB.
880 Platforms which normally make use of ROM-able zImage formats
881 normally set this to a suitable value in their defconfig file.
883 If ZBOOT_ROM is not enabled, this has no effect.
886 bool "Compressed boot loader in ROM/flash"
887 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
889 Say Y here if you intend to execute your compressed kernel image
890 (zImage) directly from ROM or flash. If unsure, say N.
893 string "Default kernel command string"
896 On some architectures (EBSA110 and CATS), there is currently no way
897 for the boot loader to pass arguments to the kernel. For these
898 architectures, you should supply some command-line options at build
899 time by entering them here. As a minimum, you should specify the
900 memory size and the root device (e.g., mem=64M root=/dev/nfs).
903 bool "Kernel Execute-In-Place from ROM"
904 depends on !ZBOOT_ROM
906 Execute-In-Place allows the kernel to run from non-volatile storage
907 directly addressable by the CPU, such as NOR flash. This saves RAM
908 space since the text section of the kernel is not loaded from flash
909 to RAM. Read-write sections, such as the data section and stack,
910 are still copied to RAM. The XIP kernel is not compressed since
911 it has to run directly from flash, so it will take more space to
912 store it. The flash address used to link the kernel object files,
913 and for storing it, is configuration dependent. Therefore, if you
914 say Y here, you must know the proper physical address where to
915 store the kernel image depending on your own flash memory usage.
917 Also note that the make target becomes "make xipImage" rather than
918 "make zImage" or "make Image". The final kernel binary to put in
919 ROM memory will be arch/arm/boot/xipImage.
924 hex "XIP Kernel Physical Location"
925 depends on XIP_KERNEL
928 This is the physical address in your flash memory the kernel will
929 be linked for and stored to. This address is dependent on your
933 bool "Kexec system call (EXPERIMENTAL)"
934 depends on EXPERIMENTAL
936 kexec is a system call that implements the ability to shutdown your
937 current kernel, and to start another kernel. It is like a reboot
938 but it is independent of the system firmware. And like a reboot
939 you can start any kernel with it, not just Linux.
941 It is an ongoing process to be certain the hardware in a machine
942 is properly shutdown, so do not be surprised if this code does not
943 initially work for you. It may help to enable device hotplugging
947 bool "Export atags in procfs"
951 Should the atags used to boot the kernel be exported in an "atags"
952 file in procfs. Useful with kexec.
956 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
958 menu "CPU Frequency scaling"
960 source "drivers/cpufreq/Kconfig"
962 config CPU_FREQ_SA1100
964 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
967 config CPU_FREQ_SA1110
969 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
972 config CPU_FREQ_INTEGRATOR
973 tristate "CPUfreq driver for ARM Integrator CPUs"
974 depends on ARCH_INTEGRATOR && CPU_FREQ
977 This enables the CPUfreq driver for ARM Integrator CPUs.
979 For details, take a look at <file:Documentation/cpu-freq>.
984 tristate "CPUfreq driver for i.MX CPUs"
985 depends on ARCH_IMX && CPU_FREQ
988 This enables the CPUfreq driver for i.MX CPUs.
994 depends on CPU_FREQ && ARCH_PXA && PXA25x
996 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1002 menu "Floating point emulation"
1004 comment "At least one emulation must be selected"
1007 bool "NWFPE math emulation"
1008 depends on !AEABI || OABI_COMPAT
1010 Say Y to include the NWFPE floating point emulator in the kernel.
1011 This is necessary to run most binaries. Linux does not currently
1012 support floating point hardware so you need to say Y here even if
1013 your machine has an FPA or floating point co-processor podule.
1015 You may say N here if you are going to load the Acorn FPEmulator
1016 early in the bootup.
1019 bool "Support extended precision"
1020 depends on FPE_NWFPE
1022 Say Y to include 80-bit support in the kernel floating-point
1023 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1024 Note that gcc does not generate 80-bit operations by default,
1025 so in most cases this option only enlarges the size of the
1026 floating point emulator without any good reason.
1028 You almost surely want to say N here.
1031 bool "FastFPE math emulation (EXPERIMENTAL)"
1032 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1034 Say Y here to include the FAST floating point emulator in the kernel.
1035 This is an experimental much faster emulator which now also has full
1036 precision for the mantissa. It does not support any exceptions.
1037 It is very simple, and approximately 3-6 times faster than NWFPE.
1039 It should be sufficient for most programs. It may be not suitable
1040 for scientific calculations, but you have to check this for yourself.
1041 If you do not feel you need a faster FP emulation you should better
1045 bool "VFP-format floating point maths"
1046 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1048 Say Y to include VFP support code in the kernel. This is needed
1049 if your hardware includes a VFP unit.
1051 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1052 release notes and additional status information.
1054 Say N if your target does not have VFP hardware.
1062 bool "Advanced SIMD (NEON) Extension support"
1063 depends on VFPv3 && CPU_V7
1065 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1070 menu "Userspace binary formats"
1072 source "fs/Kconfig.binfmt"
1075 tristate "RISC OS personality"
1078 Say Y here to include the kernel code necessary if you want to run
1079 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1080 experimental; if this sounds frightening, say N and sleep in peace.
1081 You can also say M here to compile this support as a module (which
1082 will be called arthur).
1086 menu "Power management options"
1088 source "kernel/power/Kconfig"
1090 config ARCH_SUSPEND_POSSIBLE
1095 source "net/Kconfig"
1097 menu "Device Drivers"
1099 source "drivers/base/Kconfig"
1101 source "drivers/connector/Kconfig"
1103 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1104 source "drivers/mtd/Kconfig"
1107 source "drivers/parport/Kconfig"
1109 source "drivers/pnp/Kconfig"
1111 source "drivers/block/Kconfig"
1113 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1115 source "drivers/misc/Kconfig"
1117 source "drivers/ide/Kconfig"
1119 source "drivers/scsi/Kconfig"
1121 source "drivers/ata/Kconfig"
1123 source "drivers/md/Kconfig"
1125 source "drivers/message/fusion/Kconfig"
1127 source "drivers/ieee1394/Kconfig"
1129 source "drivers/message/i2o/Kconfig"
1131 source "drivers/net/Kconfig"
1133 source "drivers/isdn/Kconfig"
1135 # input before char - char/joystick depends on it. As does USB.
1137 source "drivers/input/Kconfig"
1139 source "drivers/char/Kconfig"
1141 source "drivers/i2c/Kconfig"
1143 source "drivers/spi/Kconfig"
1145 source "drivers/gpio/Kconfig"
1147 source "drivers/w1/Kconfig"
1149 source "drivers/power/Kconfig"
1151 source "drivers/hwmon/Kconfig"
1153 source "drivers/watchdog/Kconfig"
1155 source "drivers/ssb/Kconfig"
1157 #source "drivers/l3/Kconfig"
1159 source "drivers/mfd/Kconfig"
1161 source "drivers/media/Kconfig"
1163 source "drivers/video/Kconfig"
1165 source "sound/Kconfig"
1167 source "drivers/hid/Kconfig"
1169 source "drivers/usb/Kconfig"
1171 source "drivers/mmc/Kconfig"
1173 source "drivers/leds/Kconfig"
1175 source "drivers/rtc/Kconfig"
1177 source "drivers/dma/Kconfig"
1179 source "drivers/dca/Kconfig"
1185 source "arch/arm/Kconfig.debug"
1187 source "security/Kconfig"
1189 source "crypto/Kconfig"
1191 source "lib/Kconfig"