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.
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
567 source arch/arm/mm/Kconfig
570 bool "Enable iWMMXt support"
571 depends on CPU_XSCALE || CPU_XSC3
572 default y if PXA27x || PXA3xx
574 Enable support for iWMMXt context switching at run time if
575 running on a CPU that supports it.
577 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
580 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
584 source "arch/arm/Kconfig-nommu"
589 source "arch/arm/common/Kconfig"
591 config FORCE_MAX_ZONEORDER
604 Find out whether you have ISA slots on your motherboard. ISA is the
605 name of a bus system, i.e. the way the CPU talks to the other stuff
606 inside your box. Other bus systems are PCI, EISA, MicroChannel
607 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
608 newer boards don't support it. If you have ISA, say Y, otherwise N.
610 # Select ISA DMA controller support
615 # Select ISA DMA interface
620 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
622 Find out whether you have a PCI motherboard. PCI is the name of a
623 bus system, i.e. the way the CPU talks to the other stuff inside
624 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
625 VESA. If you have PCI, say Y, otherwise N.
630 # Select the host bridge type
631 config PCI_HOST_VIA82C505
633 depends on PCI && ARCH_SHARK
636 config PCI_HOST_ITE8152
638 depends on PCI && MACH_ARMCORE
642 source "drivers/pci/Kconfig"
644 source "drivers/pcmcia/Kconfig"
648 menu "Kernel Features"
650 source "kernel/time/Kconfig"
653 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
654 depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
656 This enables support for systems with more than one CPU. If you have
657 a system with only one CPU, like most personal computers, say N. If
658 you have a system with more than one CPU, say Y.
660 If you say N here, the kernel will run on single and multiprocessor
661 machines, but will use only one CPU of a multiprocessor machine. If
662 you say Y here, the kernel will run on many, but not all, single
663 processor machines. On a single processor machine, the kernel will
664 run faster if you say N here.
666 See also <file:Documentation/i386/IO-APIC.txt>,
667 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
668 <http://www.linuxdoc.org/docs.html#howto>.
670 If you don't know what to do here, say N.
673 int "Maximum number of CPUs (2-32)"
679 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
680 depends on SMP && HOTPLUG && EXPERIMENTAL
682 Say Y here to experiment with turning CPUs off and on. CPUs
683 can be controlled through /sys/devices/system/cpu.
686 bool "Use local timer interrupts"
687 depends on SMP && REALVIEW_EB_ARM11MP
690 Enable support for local timers on SMP platforms, rather then the
691 legacy IPI broadcast method. Local timers allows the system
692 accounting to be spread across the timer interval, preventing a
693 "thundering herd" at every timer tick.
696 bool "Preemptible Kernel (EXPERIMENTAL)"
697 depends on EXPERIMENTAL
699 This option reduces the latency of the kernel when reacting to
700 real-time or interactive events by allowing a low priority process to
701 be preempted even if it is in kernel mode executing a system call.
702 This allows applications to run more reliably even when the system is
705 Say Y here if you are building a kernel for a desktop, embedded
706 or real-time system. Say N if you are unsure.
709 bool "Dynamic tick timer"
710 depends on !GENERIC_CLOCKEVENTS
712 Select this option if you want to disable continuous timer ticks
713 and have them programmed to occur as required. This option saves
714 power as the system can remain in idle state for longer.
716 By default dynamic tick is disabled during the boot, and can be
717 manually enabled with:
719 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
721 Alternatively, if you want dynamic tick automatically enabled
722 during boot, pass "dyntick=enable" via the kernel command string.
724 Please note that dynamic tick may affect the accuracy of
725 timekeeping on some platforms depending on the implementation.
726 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
727 to have accurate timekeeping with dynamic tick.
731 default 128 if ARCH_L7200
732 default 200 if ARCH_EBSA110 || ARCH_S3C2410
733 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
734 default AT91_TIMER_HZ if ARCH_AT91
738 bool "Use the ARM EABI to compile the kernel"
740 This option allows for the kernel to be compiled using the latest
741 ARM ABI (aka EABI). This is only useful if you are using a user
742 space environment that is also compiled with EABI.
744 Since there are major incompatibilities between the legacy ABI and
745 EABI, especially with regard to structure member alignment, this
746 option also changes the kernel syscall calling convention to
747 disambiguate both ABIs and allow for backward compatibility support
748 (selected with CONFIG_OABI_COMPAT).
750 To use this you need GCC version 4.0.0 or later.
753 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
754 depends on AEABI && EXPERIMENTAL
757 This option preserves the old syscall interface along with the
758 new (ARM EABI) one. It also provides a compatibility layer to
759 intercept syscalls that have structure arguments which layout
760 in memory differs between the legacy ABI and the new ARM EABI
761 (only for non "thumb" binaries). This option adds a tiny
762 overhead to all syscalls and produces a slightly larger kernel.
763 If you know you'll be using only pure EABI user space then you
764 can say N here. If this option is not selected and you attempt
765 to execute a legacy ABI binary then the result will be
766 UNPREDICTABLE (in fact it can be predicted that it won't work
767 at all). If in doubt say Y.
769 config ARCH_DISCONTIGMEM_ENABLE
771 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
773 Say Y to support efficient handling of discontiguous physical memory,
774 for architectures which are either NUMA (Non-Uniform Memory Access)
775 or have huge holes in the physical address space for other reasons.
776 See <file:Documentation/vm/numa> for more.
780 default "4" if ARCH_LH7A40X
782 depends on NEED_MULTIPLE_NODES
787 bool "Timer and CPU usage LEDs"
788 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
789 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
790 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
791 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
792 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
793 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
794 ARCH_KS8695 || MACH_RD88F5182
796 If you say Y here, the LEDs on your machine will be used
797 to provide useful information about your current system status.
799 If you are compiling a kernel for a NetWinder or EBSA-285, you will
800 be able to select which LEDs are active using the options below. If
801 you are compiling a kernel for the EBSA-110 or the LART however, the
802 red LED will simply flash regularly to indicate that the system is
803 still functional. It is safe to say Y here if you have a CATS
804 system, but the driver will do nothing.
807 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
808 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
809 || MACH_OMAP_PERSEUS2
811 depends on !GENERIC_CLOCKEVENTS
812 default y if ARCH_EBSA110
814 If you say Y here, one of the system LEDs (the green one on the
815 NetWinder, the amber one on the EBSA285, or the red one on the LART)
816 will flash regularly to indicate that the system is still
817 operational. This is mainly useful to kernel hackers who are
818 debugging unstable kernels.
820 The LART uses the same LED for both Timer LED and CPU usage LED
821 functions. You may choose to use both, but the Timer LED function
822 will overrule the CPU usage LED.
825 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
827 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
828 || MACH_OMAP_PERSEUS2
831 If you say Y here, the red LED will be used to give a good real
832 time indication of CPU usage, by lighting whenever the idle task
833 is not currently executing.
835 The LART uses the same LED for both Timer LED and CPU usage LED
836 functions. You may choose to use both, but the Timer LED function
837 will overrule the CPU usage LED.
839 config ALIGNMENT_TRAP
841 depends on CPU_CP15_MMU
842 default y if !ARCH_EBSA110
844 ARM processors cannot fetch/store information which is not
845 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
846 address divisible by 4. On 32-bit ARM processors, these non-aligned
847 fetch/store instructions will be emulated in software if you say
848 here, which has a severe performance impact. This is necessary for
849 correct operation of some network protocols. With an IP-only
850 configuration it is safe to say N, otherwise say Y.
856 # Compressed boot loader in ROM. Yes, we really want to ask about
857 # TEXT and BSS so we preserve their values in the config files.
858 config ZBOOT_ROM_TEXT
859 hex "Compressed ROM boot loader base address"
862 The physical address at which the ROM-able zImage is to be
863 placed in the target. Platforms which normally make use of
864 ROM-able zImage formats normally set this to a suitable
865 value in their defconfig file.
867 If ZBOOT_ROM is not enabled, this has no effect.
870 hex "Compressed ROM boot loader BSS address"
873 The base address of an area of read/write memory in the target
874 for the ROM-able zImage which must be available while the
875 decompressor is running. It must be large enough to hold the
876 entire decompressed kernel plus an additional 128 KiB.
877 Platforms which normally make use of ROM-able zImage formats
878 normally set this to a suitable value in their defconfig file.
880 If ZBOOT_ROM is not enabled, this has no effect.
883 bool "Compressed boot loader in ROM/flash"
884 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
886 Say Y here if you intend to execute your compressed kernel image
887 (zImage) directly from ROM or flash. If unsure, say N.
890 string "Default kernel command string"
893 On some architectures (EBSA110 and CATS), there is currently no way
894 for the boot loader to pass arguments to the kernel. For these
895 architectures, you should supply some command-line options at build
896 time by entering them here. As a minimum, you should specify the
897 memory size and the root device (e.g., mem=64M root=/dev/nfs).
900 bool "Kernel Execute-In-Place from ROM"
901 depends on !ZBOOT_ROM
903 Execute-In-Place allows the kernel to run from non-volatile storage
904 directly addressable by the CPU, such as NOR flash. This saves RAM
905 space since the text section of the kernel is not loaded from flash
906 to RAM. Read-write sections, such as the data section and stack,
907 are still copied to RAM. The XIP kernel is not compressed since
908 it has to run directly from flash, so it will take more space to
909 store it. The flash address used to link the kernel object files,
910 and for storing it, is configuration dependent. Therefore, if you
911 say Y here, you must know the proper physical address where to
912 store the kernel image depending on your own flash memory usage.
914 Also note that the make target becomes "make xipImage" rather than
915 "make zImage" or "make Image". The final kernel binary to put in
916 ROM memory will be arch/arm/boot/xipImage.
921 hex "XIP Kernel Physical Location"
922 depends on XIP_KERNEL
925 This is the physical address in your flash memory the kernel will
926 be linked for and stored to. This address is dependent on your
930 bool "Kexec system call (EXPERIMENTAL)"
931 depends on EXPERIMENTAL
933 kexec is a system call that implements the ability to shutdown your
934 current kernel, and to start another kernel. It is like a reboot
935 but it is independent of the system firmware. And like a reboot
936 you can start any kernel with it, not just Linux.
938 It is an ongoing process to be certain the hardware in a machine
939 is properly shutdown, so do not be surprised if this code does not
940 initially work for you. It may help to enable device hotplugging
944 bool "Export atags in procfs"
948 Should the atags used to boot the kernel be exported in an "atags"
949 file in procfs. Useful with kexec.
953 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
955 menu "CPU Frequency scaling"
957 source "drivers/cpufreq/Kconfig"
959 config CPU_FREQ_SA1100
961 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
964 config CPU_FREQ_SA1110
966 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
969 config CPU_FREQ_INTEGRATOR
970 tristate "CPUfreq driver for ARM Integrator CPUs"
971 depends on ARCH_INTEGRATOR && CPU_FREQ
974 This enables the CPUfreq driver for ARM Integrator CPUs.
976 For details, take a look at <file:Documentation/cpu-freq>.
981 tristate "CPUfreq driver for i.MX CPUs"
982 depends on ARCH_IMX && CPU_FREQ
985 This enables the CPUfreq driver for i.MX CPUs.
991 depends on CPU_FREQ && ARCH_PXA && PXA25x
993 select CPU_FREQ_DEFAULT_GOV_USERSPACE
999 menu "Floating point emulation"
1001 comment "At least one emulation must be selected"
1004 bool "NWFPE math emulation"
1005 depends on !AEABI || OABI_COMPAT
1007 Say Y to include the NWFPE floating point emulator in the kernel.
1008 This is necessary to run most binaries. Linux does not currently
1009 support floating point hardware so you need to say Y here even if
1010 your machine has an FPA or floating point co-processor podule.
1012 You may say N here if you are going to load the Acorn FPEmulator
1013 early in the bootup.
1016 bool "Support extended precision"
1017 depends on FPE_NWFPE
1019 Say Y to include 80-bit support in the kernel floating-point
1020 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1021 Note that gcc does not generate 80-bit operations by default,
1022 so in most cases this option only enlarges the size of the
1023 floating point emulator without any good reason.
1025 You almost surely want to say N here.
1028 bool "FastFPE math emulation (EXPERIMENTAL)"
1029 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1031 Say Y here to include the FAST floating point emulator in the kernel.
1032 This is an experimental much faster emulator which now also has full
1033 precision for the mantissa. It does not support any exceptions.
1034 It is very simple, and approximately 3-6 times faster than NWFPE.
1036 It should be sufficient for most programs. It may be not suitable
1037 for scientific calculations, but you have to check this for yourself.
1038 If you do not feel you need a faster FP emulation you should better
1042 bool "VFP-format floating point maths"
1043 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1045 Say Y to include VFP support code in the kernel. This is needed
1046 if your hardware includes a VFP unit.
1048 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1049 release notes and additional status information.
1051 Say N if your target does not have VFP hardware.
1059 bool "Advanced SIMD (NEON) Extension support"
1060 depends on VFPv3 && CPU_V7
1062 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1067 menu "Userspace binary formats"
1069 source "fs/Kconfig.binfmt"
1072 tristate "RISC OS personality"
1075 Say Y here to include the kernel code necessary if you want to run
1076 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1077 experimental; if this sounds frightening, say N and sleep in peace.
1078 You can also say M here to compile this support as a module (which
1079 will be called arthur).
1083 menu "Power management options"
1085 source "kernel/power/Kconfig"
1087 config ARCH_SUSPEND_POSSIBLE
1092 source "net/Kconfig"
1094 menu "Device Drivers"
1096 source "drivers/base/Kconfig"
1098 source "drivers/connector/Kconfig"
1100 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1101 source "drivers/mtd/Kconfig"
1104 source "drivers/parport/Kconfig"
1106 source "drivers/pnp/Kconfig"
1108 source "drivers/block/Kconfig"
1110 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1112 source "drivers/misc/Kconfig"
1114 source "drivers/ide/Kconfig"
1116 source "drivers/scsi/Kconfig"
1118 source "drivers/ata/Kconfig"
1120 source "drivers/md/Kconfig"
1122 source "drivers/message/fusion/Kconfig"
1124 source "drivers/ieee1394/Kconfig"
1126 source "drivers/message/i2o/Kconfig"
1128 source "drivers/net/Kconfig"
1130 source "drivers/isdn/Kconfig"
1132 # input before char - char/joystick depends on it. As does USB.
1134 source "drivers/input/Kconfig"
1136 source "drivers/char/Kconfig"
1138 source "drivers/i2c/Kconfig"
1140 source "drivers/spi/Kconfig"
1142 source "drivers/gpio/Kconfig"
1144 source "drivers/w1/Kconfig"
1146 source "drivers/power/Kconfig"
1148 source "drivers/hwmon/Kconfig"
1150 source "drivers/watchdog/Kconfig"
1152 source "drivers/ssb/Kconfig"
1154 #source "drivers/l3/Kconfig"
1156 source "drivers/mfd/Kconfig"
1158 source "drivers/media/Kconfig"
1160 source "drivers/video/Kconfig"
1162 source "sound/Kconfig"
1164 source "drivers/hid/Kconfig"
1166 source "drivers/usb/Kconfig"
1168 source "drivers/mmc/Kconfig"
1170 source "drivers/leds/Kconfig"
1172 source "drivers/rtc/Kconfig"
1174 source "drivers/dma/Kconfig"
1176 source "drivers/dca/Kconfig"
1179 source "drivers/cbus/Kconfig"
1180 source "drivers/dsp/dspgateway/Kconfig"
1187 source "arch/arm/Kconfig.debug"
1189 source "security/Kconfig"
1191 source "crypto/Kconfig"
1193 source "lib/Kconfig"