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 the following Marvell Orion 5x series SoCs:
390 Orion-1 (5181), Orion-NAS (5182), Orion-2 (5281.)
393 bool "Philips Nexperia PNX4008 Mobile"
395 This enables support for Philips PNX4008 mobile platform.
398 bool "PXA2xx/PXA3xx-based"
405 select GENERIC_CLOCKEVENTS
408 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
415 select ARCH_MAY_HAVE_PC_FDC
420 On the Acorn Risc-PC, Linux can support the internal IDE disk and
421 CD-ROM interface, serial and parallel port, and the floppy drive.
426 select ARCH_DISCONTIGMEM_ENABLE
432 Support for StrongARM 11x0 based boards.
435 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
439 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
440 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
441 the Samsung SMDK2410 development board (and derivatives).
450 Support for the StrongARM based Digital DNARD machine, also known
451 as "Shark" (<http://www.shark-linux.de/shark.html>).
457 Say Y here for systems based on one of the Sharp LH7A40X
458 System on a Chip processors. These CPUs include an ARM922T
459 core with a wide array of integrated devices for
460 hand-held and low-power applications.
465 select GENERIC_CLOCKEVENTS
468 Support for TI's DaVinci platform.
474 select GENERIC_CLOCKEVENTS
476 Support for TI's OMAP platform (OMAP1 and OMAP2).
479 bool "Qualcomm MSM7X00A"
481 select GENERIC_CLOCKEVENTS
483 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
484 apps processor of the MSM7X00A and depends on a shared memory
485 interface to the ARM9 modem processor which runs the baseband stack
486 and controls some vital subsystems (clock and power control, etc).
487 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
491 source "arch/arm/mach-clps711x/Kconfig"
493 source "arch/arm/mach-ep93xx/Kconfig"
495 source "arch/arm/mach-footbridge/Kconfig"
497 source "arch/arm/mach-integrator/Kconfig"
499 source "arch/arm/mach-iop32x/Kconfig"
501 source "arch/arm/mach-iop33x/Kconfig"
503 source "arch/arm/mach-iop13xx/Kconfig"
505 source "arch/arm/mach-ixp4xx/Kconfig"
507 source "arch/arm/mach-ixp2000/Kconfig"
509 source "arch/arm/mach-ixp23xx/Kconfig"
511 source "arch/arm/mach-pxa/Kconfig"
513 source "arch/arm/mach-sa1100/Kconfig"
515 source "arch/arm/plat-omap/Kconfig"
517 source "arch/arm/mach-omap1/Kconfig"
519 source "arch/arm/mach-omap2/Kconfig"
521 source "arch/arm/mach-orion5x/Kconfig"
523 source "arch/arm/plat-s3c24xx/Kconfig"
524 source "arch/arm/plat-s3c/Kconfig"
527 source "arch/arm/mach-s3c2400/Kconfig"
528 source "arch/arm/mach-s3c2410/Kconfig"
529 source "arch/arm/mach-s3c2412/Kconfig"
530 source "arch/arm/mach-s3c2440/Kconfig"
531 source "arch/arm/mach-s3c2442/Kconfig"
532 source "arch/arm/mach-s3c2443/Kconfig"
535 source "arch/arm/mach-lh7a40x/Kconfig"
537 source "arch/arm/mach-imx/Kconfig"
539 source "arch/arm/mach-h720x/Kconfig"
541 source "arch/arm/mach-versatile/Kconfig"
543 source "arch/arm/mach-aaec2000/Kconfig"
545 source "arch/arm/mach-realview/Kconfig"
547 source "arch/arm/mach-at91/Kconfig"
549 source "arch/arm/plat-mxc/Kconfig"
551 source "arch/arm/mach-netx/Kconfig"
553 source "arch/arm/mach-ns9xxx/Kconfig"
555 source "arch/arm/mach-davinci/Kconfig"
557 source "arch/arm/mach-ks8695/Kconfig"
559 source "arch/arm/mach-msm/Kconfig"
561 # Definitions to make life easier
571 source arch/arm/mm/Kconfig
574 bool "Enable iWMMXt support"
575 depends on CPU_XSCALE || CPU_XSC3
576 default y if PXA27x || PXA3xx
578 Enable support for iWMMXt context switching at run time if
579 running on a CPU that supports it.
581 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
584 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
588 source "arch/arm/Kconfig-nommu"
593 source "arch/arm/common/Kconfig"
595 config FORCE_MAX_ZONEORDER
608 Find out whether you have ISA slots on your motherboard. ISA is the
609 name of a bus system, i.e. the way the CPU talks to the other stuff
610 inside your box. Other bus systems are PCI, EISA, MicroChannel
611 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
612 newer boards don't support it. If you have ISA, say Y, otherwise N.
614 # Select ISA DMA controller support
619 # Select ISA DMA interface
624 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
626 Find out whether you have a PCI motherboard. PCI is the name of a
627 bus system, i.e. the way the CPU talks to the other stuff inside
628 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
629 VESA. If you have PCI, say Y, otherwise N.
634 # Select the host bridge type
635 config PCI_HOST_VIA82C505
637 depends on PCI && ARCH_SHARK
640 config PCI_HOST_ITE8152
642 depends on PCI && MACH_ARMCORE
646 source "drivers/pci/Kconfig"
648 source "drivers/pcmcia/Kconfig"
652 menu "Kernel Features"
654 source "kernel/time/Kconfig"
657 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
658 depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
660 This enables support for systems with more than one CPU. If you have
661 a system with only one CPU, like most personal computers, say N. If
662 you have a system with more than one CPU, say Y.
664 If you say N here, the kernel will run on single and multiprocessor
665 machines, but will use only one CPU of a multiprocessor machine. If
666 you say Y here, the kernel will run on many, but not all, single
667 processor machines. On a single processor machine, the kernel will
668 run faster if you say N here.
670 See also <file:Documentation/i386/IO-APIC.txt>,
671 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
672 <http://www.linuxdoc.org/docs.html#howto>.
674 If you don't know what to do here, say N.
677 int "Maximum number of CPUs (2-32)"
683 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
684 depends on SMP && HOTPLUG && EXPERIMENTAL
686 Say Y here to experiment with turning CPUs off and on. CPUs
687 can be controlled through /sys/devices/system/cpu.
690 bool "Use local timer interrupts"
691 depends on SMP && REALVIEW_EB_ARM11MP
694 Enable support for local timers on SMP platforms, rather then the
695 legacy IPI broadcast method. Local timers allows the system
696 accounting to be spread across the timer interval, preventing a
697 "thundering herd" at every timer tick.
700 bool "Preemptible Kernel (EXPERIMENTAL)"
701 depends on EXPERIMENTAL
703 This option reduces the latency of the kernel when reacting to
704 real-time or interactive events by allowing a low priority process to
705 be preempted even if it is in kernel mode executing a system call.
706 This allows applications to run more reliably even when the system is
709 Say Y here if you are building a kernel for a desktop, embedded
710 or real-time system. Say N if you are unsure.
713 bool "Dynamic tick timer"
714 depends on !GENERIC_CLOCKEVENTS
716 Select this option if you want to disable continuous timer ticks
717 and have them programmed to occur as required. This option saves
718 power as the system can remain in idle state for longer.
720 By default dynamic tick is disabled during the boot, and can be
721 manually enabled with:
723 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
725 Alternatively, if you want dynamic tick automatically enabled
726 during boot, pass "dyntick=enable" via the kernel command string.
728 Please note that dynamic tick may affect the accuracy of
729 timekeeping on some platforms depending on the implementation.
730 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
731 to have accurate timekeeping with dynamic tick.
735 default 128 if ARCH_L7200
736 default 200 if ARCH_EBSA110 || ARCH_S3C2410
737 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
738 default AT91_TIMER_HZ if ARCH_AT91
742 bool "Use the ARM EABI to compile the kernel"
744 This option allows for the kernel to be compiled using the latest
745 ARM ABI (aka EABI). This is only useful if you are using a user
746 space environment that is also compiled with EABI.
748 Since there are major incompatibilities between the legacy ABI and
749 EABI, especially with regard to structure member alignment, this
750 option also changes the kernel syscall calling convention to
751 disambiguate both ABIs and allow for backward compatibility support
752 (selected with CONFIG_OABI_COMPAT).
754 To use this you need GCC version 4.0.0 or later.
757 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
758 depends on AEABI && EXPERIMENTAL
761 This option preserves the old syscall interface along with the
762 new (ARM EABI) one. It also provides a compatibility layer to
763 intercept syscalls that have structure arguments which layout
764 in memory differs between the legacy ABI and the new ARM EABI
765 (only for non "thumb" binaries). This option adds a tiny
766 overhead to all syscalls and produces a slightly larger kernel.
767 If you know you'll be using only pure EABI user space then you
768 can say N here. If this option is not selected and you attempt
769 to execute a legacy ABI binary then the result will be
770 UNPREDICTABLE (in fact it can be predicted that it won't work
771 at all). If in doubt say Y.
773 config ARCH_DISCONTIGMEM_ENABLE
775 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
777 Say Y to support efficient handling of discontiguous physical memory,
778 for architectures which are either NUMA (Non-Uniform Memory Access)
779 or have huge holes in the physical address space for other reasons.
780 See <file:Documentation/vm/numa> for more.
784 default "4" if ARCH_LH7A40X
786 depends on NEED_MULTIPLE_NODES
791 bool "Timer and CPU usage LEDs"
792 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
793 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
794 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
795 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
796 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
797 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
798 ARCH_KS8695 || MACH_RD88F5182
800 If you say Y here, the LEDs on your machine will be used
801 to provide useful information about your current system status.
803 If you are compiling a kernel for a NetWinder or EBSA-285, you will
804 be able to select which LEDs are active using the options below. If
805 you are compiling a kernel for the EBSA-110 or the LART however, the
806 red LED will simply flash regularly to indicate that the system is
807 still functional. It is safe to say Y here if you have a CATS
808 system, but the driver will do nothing.
811 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
812 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
813 || MACH_OMAP_PERSEUS2
815 depends on !GENERIC_CLOCKEVENTS
816 default y if ARCH_EBSA110
818 If you say Y here, one of the system LEDs (the green one on the
819 NetWinder, the amber one on the EBSA285, or the red one on the LART)
820 will flash regularly to indicate that the system is still
821 operational. This is mainly useful to kernel hackers who are
822 debugging unstable kernels.
824 The LART uses the same LED for both Timer LED and CPU usage LED
825 functions. You may choose to use both, but the Timer LED function
826 will overrule the CPU usage LED.
829 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
831 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
832 || MACH_OMAP_PERSEUS2
835 If you say Y here, the red LED will be used to give a good real
836 time indication of CPU usage, by lighting whenever the idle task
837 is not currently executing.
839 The LART uses the same LED for both Timer LED and CPU usage LED
840 functions. You may choose to use both, but the Timer LED function
841 will overrule the CPU usage LED.
843 config ALIGNMENT_TRAP
845 depends on CPU_CP15_MMU
846 default y if !ARCH_EBSA110
848 ARM processors cannot fetch/store information which is not
849 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
850 address divisible by 4. On 32-bit ARM processors, these non-aligned
851 fetch/store instructions will be emulated in software if you say
852 here, which has a severe performance impact. This is necessary for
853 correct operation of some network protocols. With an IP-only
854 configuration it is safe to say N, otherwise say Y.
860 # Compressed boot loader in ROM. Yes, we really want to ask about
861 # TEXT and BSS so we preserve their values in the config files.
862 config ZBOOT_ROM_TEXT
863 hex "Compressed ROM boot loader base address"
866 The physical address at which the ROM-able zImage is to be
867 placed in the target. Platforms which normally make use of
868 ROM-able zImage formats normally set this to a suitable
869 value in their defconfig file.
871 If ZBOOT_ROM is not enabled, this has no effect.
874 hex "Compressed ROM boot loader BSS address"
877 The base address of an area of read/write memory in the target
878 for the ROM-able zImage which must be available while the
879 decompressor is running. It must be large enough to hold the
880 entire decompressed kernel plus an additional 128 KiB.
881 Platforms which normally make use of ROM-able zImage formats
882 normally set this to a suitable value in their defconfig file.
884 If ZBOOT_ROM is not enabled, this has no effect.
887 bool "Compressed boot loader in ROM/flash"
888 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
890 Say Y here if you intend to execute your compressed kernel image
891 (zImage) directly from ROM or flash. If unsure, say N.
894 string "Default kernel command string"
897 On some architectures (EBSA110 and CATS), there is currently no way
898 for the boot loader to pass arguments to the kernel. For these
899 architectures, you should supply some command-line options at build
900 time by entering them here. As a minimum, you should specify the
901 memory size and the root device (e.g., mem=64M root=/dev/nfs).
904 bool "Kernel Execute-In-Place from ROM"
905 depends on !ZBOOT_ROM
907 Execute-In-Place allows the kernel to run from non-volatile storage
908 directly addressable by the CPU, such as NOR flash. This saves RAM
909 space since the text section of the kernel is not loaded from flash
910 to RAM. Read-write sections, such as the data section and stack,
911 are still copied to RAM. The XIP kernel is not compressed since
912 it has to run directly from flash, so it will take more space to
913 store it. The flash address used to link the kernel object files,
914 and for storing it, is configuration dependent. Therefore, if you
915 say Y here, you must know the proper physical address where to
916 store the kernel image depending on your own flash memory usage.
918 Also note that the make target becomes "make xipImage" rather than
919 "make zImage" or "make Image". The final kernel binary to put in
920 ROM memory will be arch/arm/boot/xipImage.
925 hex "XIP Kernel Physical Location"
926 depends on XIP_KERNEL
929 This is the physical address in your flash memory the kernel will
930 be linked for and stored to. This address is dependent on your
934 bool "Kexec system call (EXPERIMENTAL)"
935 depends on EXPERIMENTAL
937 kexec is a system call that implements the ability to shutdown your
938 current kernel, and to start another kernel. It is like a reboot
939 but it is independent of the system firmware. And like a reboot
940 you can start any kernel with it, not just Linux.
942 It is an ongoing process to be certain the hardware in a machine
943 is properly shutdown, so do not be surprised if this code does not
944 initially work for you. It may help to enable device hotplugging
948 bool "Export atags in procfs"
952 Should the atags used to boot the kernel be exported in an "atags"
953 file in procfs. Useful with kexec.
957 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
959 menu "CPU Frequency scaling"
961 source "drivers/cpufreq/Kconfig"
963 config CPU_FREQ_SA1100
965 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
968 config CPU_FREQ_SA1110
970 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
973 config CPU_FREQ_INTEGRATOR
974 tristate "CPUfreq driver for ARM Integrator CPUs"
975 depends on ARCH_INTEGRATOR && CPU_FREQ
978 This enables the CPUfreq driver for ARM Integrator CPUs.
980 For details, take a look at <file:Documentation/cpu-freq>.
985 tristate "CPUfreq driver for i.MX CPUs"
986 depends on ARCH_IMX && CPU_FREQ
989 This enables the CPUfreq driver for i.MX CPUs.
995 depends on CPU_FREQ && ARCH_PXA && PXA25x
997 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1003 menu "Floating point emulation"
1005 comment "At least one emulation must be selected"
1008 bool "NWFPE math emulation"
1009 depends on !AEABI || OABI_COMPAT
1011 Say Y to include the NWFPE floating point emulator in the kernel.
1012 This is necessary to run most binaries. Linux does not currently
1013 support floating point hardware so you need to say Y here even if
1014 your machine has an FPA or floating point co-processor podule.
1016 You may say N here if you are going to load the Acorn FPEmulator
1017 early in the bootup.
1020 bool "Support extended precision"
1021 depends on FPE_NWFPE
1023 Say Y to include 80-bit support in the kernel floating-point
1024 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1025 Note that gcc does not generate 80-bit operations by default,
1026 so in most cases this option only enlarges the size of the
1027 floating point emulator without any good reason.
1029 You almost surely want to say N here.
1032 bool "FastFPE math emulation (EXPERIMENTAL)"
1033 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1035 Say Y here to include the FAST floating point emulator in the kernel.
1036 This is an experimental much faster emulator which now also has full
1037 precision for the mantissa. It does not support any exceptions.
1038 It is very simple, and approximately 3-6 times faster than NWFPE.
1040 It should be sufficient for most programs. It may be not suitable
1041 for scientific calculations, but you have to check this for yourself.
1042 If you do not feel you need a faster FP emulation you should better
1046 bool "VFP-format floating point maths"
1047 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1049 Say Y to include VFP support code in the kernel. This is needed
1050 if your hardware includes a VFP unit.
1052 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1053 release notes and additional status information.
1055 Say N if your target does not have VFP hardware.
1063 bool "Advanced SIMD (NEON) Extension support"
1064 depends on VFPv3 && CPU_V7
1066 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1071 menu "Userspace binary formats"
1073 source "fs/Kconfig.binfmt"
1076 tristate "RISC OS personality"
1079 Say Y here to include the kernel code necessary if you want to run
1080 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1081 experimental; if this sounds frightening, say N and sleep in peace.
1082 You can also say M here to compile this support as a module (which
1083 will be called arthur).
1087 menu "Power management options"
1089 source "kernel/power/Kconfig"
1091 config ARCH_SUSPEND_POSSIBLE
1096 source "net/Kconfig"
1098 menu "Device Drivers"
1100 source "drivers/base/Kconfig"
1102 source "drivers/connector/Kconfig"
1104 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1105 source "drivers/mtd/Kconfig"
1108 source "drivers/parport/Kconfig"
1110 source "drivers/pnp/Kconfig"
1112 source "drivers/block/Kconfig"
1114 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1116 source "drivers/misc/Kconfig"
1118 source "drivers/ide/Kconfig"
1120 source "drivers/scsi/Kconfig"
1122 source "drivers/ata/Kconfig"
1124 source "drivers/md/Kconfig"
1126 source "drivers/message/fusion/Kconfig"
1128 source "drivers/ieee1394/Kconfig"
1130 source "drivers/message/i2o/Kconfig"
1132 source "drivers/net/Kconfig"
1134 source "drivers/isdn/Kconfig"
1136 # input before char - char/joystick depends on it. As does USB.
1138 source "drivers/input/Kconfig"
1140 source "drivers/char/Kconfig"
1142 source "drivers/i2c/Kconfig"
1144 source "drivers/spi/Kconfig"
1146 source "drivers/gpio/Kconfig"
1148 source "drivers/w1/Kconfig"
1150 source "drivers/power/Kconfig"
1152 source "drivers/hwmon/Kconfig"
1154 source "drivers/watchdog/Kconfig"
1156 source "drivers/ssb/Kconfig"
1158 #source "drivers/l3/Kconfig"
1160 source "drivers/mfd/Kconfig"
1162 source "drivers/media/Kconfig"
1164 source "drivers/video/Kconfig"
1166 source "sound/Kconfig"
1168 source "drivers/hid/Kconfig"
1170 source "drivers/usb/Kconfig"
1172 source "drivers/mmc/Kconfig"
1174 source "drivers/leds/Kconfig"
1176 source "drivers/rtc/Kconfig"
1178 source "drivers/dma/Kconfig"
1180 source "drivers/dca/Kconfig"
1186 source "arch/arm/Kconfig.debug"
1188 source "security/Kconfig"
1190 source "crypto/Kconfig"
1192 source "lib/Kconfig"