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)
16 The ARM series is a line of low-power-consumption RISC chip designs
17 licensed by ARM Ltd and targeted at embedded applications and
18 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
19 manufactured, but legacy ARM-based PC hardware remains popular in
20 Europe. There is an ARM Linux project with a web page at
21 <http://www.arm.linux.org.uk/>.
23 config SYS_SUPPORTS_APM_EMULATION
34 config GENERIC_CLOCKEVENTS
38 config GENERIC_CLOCKEVENTS_BROADCAST
40 depends on GENERIC_CLOCKEVENTS
41 default y if SMP && !LOCAL_TIMERS
54 The Extended Industry Standard Architecture (EISA) bus was
55 developed as an open alternative to the IBM MicroChannel bus.
57 The EISA bus provided some of the features of the IBM MicroChannel
58 bus while maintaining backward compatibility with cards made for
59 the older ISA bus. The EISA bus saw limited use between 1988 and
60 1995 when it was made obsolete by the PCI bus.
62 Say Y here if you are building a kernel for an EISA-based machine.
72 MicroChannel Architecture is found in some IBM PS/2 machines and
73 laptops. It is a bus system similar to PCI or ISA. See
74 <file:Documentation/mca.txt> (and especially the web page given
75 there) before attempting to build an MCA bus kernel.
77 config GENERIC_HARDIRQS
81 config STACKTRACE_SUPPORT
85 config LOCKDEP_SUPPORT
89 config TRACE_IRQFLAGS_SUPPORT
93 config HARDIRQS_SW_RESEND
97 config GENERIC_IRQ_PROBE
101 config GENERIC_LOCKBREAK
104 depends on SMP && PREEMPT
106 config RWSEM_GENERIC_SPINLOCK
110 config RWSEM_XCHGADD_ALGORITHM
113 config ARCH_HAS_ILOG2_U32
117 config ARCH_HAS_ILOG2_U64
121 config GENERIC_HWEIGHT
125 config GENERIC_CALIBRATE_DELAY
129 config ARCH_SUPPORTS_AOUT
132 config ARCH_MAY_HAVE_PC_FDC
139 config GENERIC_ISA_DMA
150 config OPROFILE_ARMV6
152 depends on CPU_V6 && !SMP
153 select OPROFILE_ARM11_CORE
155 config OPROFILE_MPCORE
157 depends on CPU_V6 && SMP
158 select OPROFILE_ARM11_CORE
160 config OPROFILE_ARM11_CORE
167 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
168 default DRAM_BASE if REMAP_VECTORS_TO_RAM
171 The base address of exception vectors.
173 source "init/Kconfig"
178 prompt "ARM system type"
179 default ARCH_VERSATILE
182 bool "Agilent AAEC-2000 based"
185 This enables support for systems based on the Agilent AAEC-2000
187 config ARCH_INTEGRATOR
188 bool "ARM Ltd. Integrator family"
192 Support for ARM's Integrator platform.
195 bool "ARM Ltd. RealView family"
199 select GENERIC_CLOCKEVENTS
201 This enables support for ARM Ltd RealView boards.
203 config ARCH_VERSATILE
204 bool "ARM Ltd. Versatile family"
209 select GENERIC_CLOCKEVENTS
211 This enables support for ARM Ltd Versatile board.
217 This enables support for systems based on the Atmel AT91RM9200,
218 AT91SAM9 and AT91CAP9 processors.
221 bool "Cirrus CL-PS7500FE"
227 Support for the Cirrus Logic PS7500FE system-on-a-chip.
230 bool "Cirrus Logic CLPS711x/EP721x-based"
232 Support for Cirrus Logic 711x/721x based boards.
237 select FOOTBRIDGE_ADDIN
240 Support for Intel's EBSA285 companion chip.
247 This is an evaluation board for the StrongARM processor available
248 from Digital. It has limited hardware on-board, including an
249 Ethernet interface, two PCMCIA sockets, two serial ports and a
258 This enables support for the Cirrus EP93xx series of CPUs.
260 config ARCH_FOOTBRIDGE
265 Support for systems based on the DC21285 companion chip
266 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
269 bool "Hilscher NetX based"
272 This enables support for systems based on the Hilscher NetX Soc
275 bool "Hynix HMS720x-based"
278 This enables support for systems based on the Hynix HMS720x
284 select GENERIC_CLOCKEVENTS
286 Support for Motorola's i.MX family of processors (MX1, MXL).
293 select ARCH_SUPPORTS_MSI
295 Support for Intel's IOP13XX (XScale) family of processors.
304 Support for Intel's 80219 and IOP32X (XScale) family of
314 Support for Intel's IOP33X (XScale) family of processors.
322 Support for Intel's IXP23xx (XScale) family of processors.
325 bool "IXP2400/2800-based"
329 Support for Intel's IXP2400/2800 (XScale) family of processors.
336 select GENERIC_CLOCKEVENTS
339 Support for Intel's IXP4XX (XScale) family of processors.
346 Say Y here if you intend to run this kernel on a LinkUp Systems
347 L7200 Software Development Board which uses an ARM720T processor.
348 Information on this board can be obtained at:
350 <http://www.linkupsys.com/>
352 If you have any questions or comments about the Linux kernel port
353 to this board, send e-mail to <sjhill@cotw.com>.
356 bool "Micrel/Kendin KS8695"
359 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
360 System-on-Chip devices.
363 bool "NetSilicon NS9xxx"
366 select GENERIC_CLOCKEVENTS
368 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
371 <http://www.digi.com/products/microprocessors/index.jsp>
374 bool "Freescale MXC/iMX-based"
377 Support for Freescale MXC/iMX-based family of processors
385 select GENERIC_CLOCKEVENTS
387 Support for Marvell Orion System on Chip family.
390 bool "Philips Nexperia PNX4008 Mobile"
392 This enables support for Philips PNX4008 mobile platform.
395 bool "PXA2xx/PXA3xx-based"
402 select GENERIC_CLOCKEVENTS
405 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
412 select ARCH_MAY_HAVE_PC_FDC
417 On the Acorn Risc-PC, Linux can support the internal IDE disk and
418 CD-ROM interface, serial and parallel port, and the floppy drive.
423 select ARCH_DISCONTIGMEM_ENABLE
429 Support for StrongARM 11x0 based boards.
432 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
436 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
437 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
438 the Samsung SMDK2410 development board (and derivatives).
447 Support for the StrongARM based Digital DNARD machine, also known
448 as "Shark" (<http://www.shark-linux.de/shark.html>).
454 Say Y here for systems based on one of the Sharp LH7A40X
455 System on a Chip processors. These CPUs include an ARM922T
456 core with a wide array of integrated devices for
457 hand-held and low-power applications.
462 select GENERIC_CLOCKEVENTS
465 Support for TI's DaVinci platform.
471 select GENERIC_CLOCKEVENTS
473 Support for TI's OMAP platform (OMAP1 and OMAP2).
476 bool "Qualcomm MSM7X00A"
478 select GENERIC_CLOCKEVENTS
480 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
481 apps processor of the MSM7X00A and depends on a shared memory
482 interface to the ARM9 modem processor which runs the baseband stack
483 and controls some vital subsystems (clock and power control, etc).
484 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
488 source "arch/arm/mach-clps711x/Kconfig"
490 source "arch/arm/mach-ep93xx/Kconfig"
492 source "arch/arm/mach-footbridge/Kconfig"
494 source "arch/arm/mach-integrator/Kconfig"
496 source "arch/arm/mach-iop32x/Kconfig"
498 source "arch/arm/mach-iop33x/Kconfig"
500 source "arch/arm/mach-iop13xx/Kconfig"
502 source "arch/arm/mach-ixp4xx/Kconfig"
504 source "arch/arm/mach-ixp2000/Kconfig"
506 source "arch/arm/mach-ixp23xx/Kconfig"
508 source "arch/arm/mach-pxa/Kconfig"
510 source "arch/arm/mach-sa1100/Kconfig"
512 source "arch/arm/plat-omap/Kconfig"
514 source "arch/arm/mach-omap1/Kconfig"
516 source "arch/arm/mach-omap2/Kconfig"
518 source "arch/arm/mach-orion/Kconfig"
520 source "arch/arm/plat-s3c24xx/Kconfig"
521 source "arch/arm/plat-s3c/Kconfig"
524 source "arch/arm/mach-s3c2400/Kconfig"
525 source "arch/arm/mach-s3c2410/Kconfig"
526 source "arch/arm/mach-s3c2412/Kconfig"
527 source "arch/arm/mach-s3c2440/Kconfig"
528 source "arch/arm/mach-s3c2442/Kconfig"
529 source "arch/arm/mach-s3c2443/Kconfig"
532 source "arch/arm/mach-lh7a40x/Kconfig"
534 source "arch/arm/mach-imx/Kconfig"
536 source "arch/arm/mach-h720x/Kconfig"
538 source "arch/arm/mach-versatile/Kconfig"
540 source "arch/arm/mach-aaec2000/Kconfig"
542 source "arch/arm/mach-realview/Kconfig"
544 source "arch/arm/mach-at91/Kconfig"
546 source "arch/arm/plat-mxc/Kconfig"
548 source "arch/arm/mach-netx/Kconfig"
550 source "arch/arm/mach-ns9xxx/Kconfig"
552 source "arch/arm/mach-davinci/Kconfig"
554 source "arch/arm/mach-ks8695/Kconfig"
556 source "arch/arm/mach-msm/Kconfig"
558 # Definitions to make life easier
565 source arch/arm/mm/Kconfig
568 bool "Enable iWMMXt support"
569 depends on CPU_XSCALE || CPU_XSC3
570 default y if PXA27x || PXA3xx
572 Enable support for iWMMXt context switching at run time if
573 running on a CPU that supports it.
575 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
578 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
582 source "arch/arm/Kconfig-nommu"
587 source "arch/arm/common/Kconfig"
589 config FORCE_MAX_ZONEORDER
602 Find out whether you have ISA slots on your motherboard. ISA is the
603 name of a bus system, i.e. the way the CPU talks to the other stuff
604 inside your box. Other bus systems are PCI, EISA, MicroChannel
605 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
606 newer boards don't support it. If you have ISA, say Y, otherwise N.
608 # Select ISA DMA controller support
613 # Select ISA DMA interface
618 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
620 Find out whether you have a PCI motherboard. PCI is the name of a
621 bus system, i.e. the way the CPU talks to the other stuff inside
622 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
623 VESA. If you have PCI, say Y, otherwise N.
628 # Select the host bridge type
629 config PCI_HOST_VIA82C505
631 depends on PCI && ARCH_SHARK
634 config PCI_HOST_ITE8152
636 depends on PCI && MACH_ARMCORE
640 source "drivers/pci/Kconfig"
642 source "drivers/pcmcia/Kconfig"
646 menu "Kernel Features"
648 source "kernel/time/Kconfig"
651 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
652 depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
654 This enables support for systems with more than one CPU. If you have
655 a system with only one CPU, like most personal computers, say N. If
656 you have a system with more than one CPU, say Y.
658 If you say N here, the kernel will run on single and multiprocessor
659 machines, but will use only one CPU of a multiprocessor machine. If
660 you say Y here, the kernel will run on many, but not all, single
661 processor machines. On a single processor machine, the kernel will
662 run faster if you say N here.
664 See also <file:Documentation/i386/IO-APIC.txt>,
665 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
666 <http://www.linuxdoc.org/docs.html#howto>.
668 If you don't know what to do here, say N.
671 int "Maximum number of CPUs (2-32)"
677 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
678 depends on SMP && HOTPLUG && EXPERIMENTAL
680 Say Y here to experiment with turning CPUs off and on. CPUs
681 can be controlled through /sys/devices/system/cpu.
684 bool "Use local timer interrupts"
685 depends on SMP && REALVIEW_EB_ARM11MP
688 Enable support for local timers on SMP platforms, rather then the
689 legacy IPI broadcast method. Local timers allows the system
690 accounting to be spread across the timer interval, preventing a
691 "thundering herd" at every timer tick.
694 bool "Preemptible Kernel (EXPERIMENTAL)"
695 depends on EXPERIMENTAL
697 This option reduces the latency of the kernel when reacting to
698 real-time or interactive events by allowing a low priority process to
699 be preempted even if it is in kernel mode executing a system call.
700 This allows applications to run more reliably even when the system is
703 Say Y here if you are building a kernel for a desktop, embedded
704 or real-time system. Say N if you are unsure.
707 bool "Dynamic tick timer"
708 depends on !GENERIC_CLOCKEVENTS
710 Select this option if you want to disable continuous timer ticks
711 and have them programmed to occur as required. This option saves
712 power as the system can remain in idle state for longer.
714 By default dynamic tick is disabled during the boot, and can be
715 manually enabled with:
717 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
719 Alternatively, if you want dynamic tick automatically enabled
720 during boot, pass "dyntick=enable" via the kernel command string.
722 Please note that dynamic tick may affect the accuracy of
723 timekeeping on some platforms depending on the implementation.
724 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
725 to have accurate timekeeping with dynamic tick.
729 default 128 if ARCH_L7200
730 default 200 if ARCH_EBSA110 || ARCH_S3C2410
731 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
732 default AT91_TIMER_HZ if ARCH_AT91
736 bool "Use the ARM EABI to compile the kernel"
738 This option allows for the kernel to be compiled using the latest
739 ARM ABI (aka EABI). This is only useful if you are using a user
740 space environment that is also compiled with EABI.
742 Since there are major incompatibilities between the legacy ABI and
743 EABI, especially with regard to structure member alignment, this
744 option also changes the kernel syscall calling convention to
745 disambiguate both ABIs and allow for backward compatibility support
746 (selected with CONFIG_OABI_COMPAT).
748 To use this you need GCC version 4.0.0 or later.
751 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
752 depends on AEABI && EXPERIMENTAL
755 This option preserves the old syscall interface along with the
756 new (ARM EABI) one. It also provides a compatibility layer to
757 intercept syscalls that have structure arguments which layout
758 in memory differs between the legacy ABI and the new ARM EABI
759 (only for non "thumb" binaries). This option adds a tiny
760 overhead to all syscalls and produces a slightly larger kernel.
761 If you know you'll be using only pure EABI user space then you
762 can say N here. If this option is not selected and you attempt
763 to execute a legacy ABI binary then the result will be
764 UNPREDICTABLE (in fact it can be predicted that it won't work
765 at all). If in doubt say Y.
767 config ARCH_DISCONTIGMEM_ENABLE
769 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
771 Say Y to support efficient handling of discontiguous physical memory,
772 for architectures which are either NUMA (Non-Uniform Memory Access)
773 or have huge holes in the physical address space for other reasons.
774 See <file:Documentation/vm/numa> for more.
778 default "4" if ARCH_LH7A40X
780 depends on NEED_MULTIPLE_NODES
785 bool "Timer and CPU usage LEDs"
786 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
787 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
788 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
789 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
790 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
791 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
792 ARCH_KS8695 || MACH_RD88F5182
794 If you say Y here, the LEDs on your machine will be used
795 to provide useful information about your current system status.
797 If you are compiling a kernel for a NetWinder or EBSA-285, you will
798 be able to select which LEDs are active using the options below. If
799 you are compiling a kernel for the EBSA-110 or the LART however, the
800 red LED will simply flash regularly to indicate that the system is
801 still functional. It is safe to say Y here if you have a CATS
802 system, but the driver will do nothing.
805 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
806 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
807 || MACH_OMAP_PERSEUS2
809 depends on !GENERIC_CLOCKEVENTS
810 default y if ARCH_EBSA110
812 If you say Y here, one of the system LEDs (the green one on the
813 NetWinder, the amber one on the EBSA285, or the red one on the LART)
814 will flash regularly to indicate that the system is still
815 operational. This is mainly useful to kernel hackers who are
816 debugging unstable kernels.
818 The LART uses the same LED for both Timer LED and CPU usage LED
819 functions. You may choose to use both, but the Timer LED function
820 will overrule the CPU usage LED.
823 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
825 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
826 || MACH_OMAP_PERSEUS2
829 If you say Y here, the red LED will be used to give a good real
830 time indication of CPU usage, by lighting whenever the idle task
831 is not currently executing.
833 The LART uses the same LED for both Timer LED and CPU usage LED
834 functions. You may choose to use both, but the Timer LED function
835 will overrule the CPU usage LED.
837 config ALIGNMENT_TRAP
839 depends on CPU_CP15_MMU
840 default y if !ARCH_EBSA110
842 ARM processors cannot fetch/store information which is not
843 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
844 address divisible by 4. On 32-bit ARM processors, these non-aligned
845 fetch/store instructions will be emulated in software if you say
846 here, which has a severe performance impact. This is necessary for
847 correct operation of some network protocols. With an IP-only
848 configuration it is safe to say N, otherwise say Y.
854 # Compressed boot loader in ROM. Yes, we really want to ask about
855 # TEXT and BSS so we preserve their values in the config files.
856 config ZBOOT_ROM_TEXT
857 hex "Compressed ROM boot loader base address"
860 The physical address at which the ROM-able zImage is to be
861 placed in the target. Platforms which normally make use of
862 ROM-able zImage formats normally set this to a suitable
863 value in their defconfig file.
865 If ZBOOT_ROM is not enabled, this has no effect.
868 hex "Compressed ROM boot loader BSS address"
871 The base address of an area of read/write memory in the target
872 for the ROM-able zImage which must be available while the
873 decompressor is running. It must be large enough to hold the
874 entire decompressed kernel plus an additional 128 KiB.
875 Platforms which normally make use of ROM-able zImage formats
876 normally set this to a suitable value in their defconfig file.
878 If ZBOOT_ROM is not enabled, this has no effect.
881 bool "Compressed boot loader in ROM/flash"
882 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
884 Say Y here if you intend to execute your compressed kernel image
885 (zImage) directly from ROM or flash. If unsure, say N.
888 string "Default kernel command string"
891 On some architectures (EBSA110 and CATS), there is currently no way
892 for the boot loader to pass arguments to the kernel. For these
893 architectures, you should supply some command-line options at build
894 time by entering them here. As a minimum, you should specify the
895 memory size and the root device (e.g., mem=64M root=/dev/nfs).
898 bool "Kernel Execute-In-Place from ROM"
899 depends on !ZBOOT_ROM
901 Execute-In-Place allows the kernel to run from non-volatile storage
902 directly addressable by the CPU, such as NOR flash. This saves RAM
903 space since the text section of the kernel is not loaded from flash
904 to RAM. Read-write sections, such as the data section and stack,
905 are still copied to RAM. The XIP kernel is not compressed since
906 it has to run directly from flash, so it will take more space to
907 store it. The flash address used to link the kernel object files,
908 and for storing it, is configuration dependent. Therefore, if you
909 say Y here, you must know the proper physical address where to
910 store the kernel image depending on your own flash memory usage.
912 Also note that the make target becomes "make xipImage" rather than
913 "make zImage" or "make Image". The final kernel binary to put in
914 ROM memory will be arch/arm/boot/xipImage.
919 hex "XIP Kernel Physical Location"
920 depends on XIP_KERNEL
923 This is the physical address in your flash memory the kernel will
924 be linked for and stored to. This address is dependent on your
928 bool "Kexec system call (EXPERIMENTAL)"
929 depends on EXPERIMENTAL
931 kexec is a system call that implements the ability to shutdown your
932 current kernel, and to start another kernel. It is like a reboot
933 but it is independent of the system firmware. And like a reboot
934 you can start any kernel with it, not just Linux.
936 It is an ongoing process to be certain the hardware in a machine
937 is properly shutdown, so do not be surprised if this code does not
938 initially work for you. It may help to enable device hotplugging
942 bool "Export atags in procfs"
945 Should the atags used to boot the kernel be exported in an "atags"
946 file in procfs. Useful with kexec.
950 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
952 menu "CPU Frequency scaling"
954 source "drivers/cpufreq/Kconfig"
956 config CPU_FREQ_SA1100
958 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
961 config CPU_FREQ_SA1110
963 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
966 config CPU_FREQ_INTEGRATOR
967 tristate "CPUfreq driver for ARM Integrator CPUs"
968 depends on ARCH_INTEGRATOR && CPU_FREQ
971 This enables the CPUfreq driver for ARM Integrator CPUs.
973 For details, take a look at <file:Documentation/cpu-freq>.
978 tristate "CPUfreq driver for i.MX CPUs"
979 depends on ARCH_IMX && CPU_FREQ
982 This enables the CPUfreq driver for i.MX CPUs.
988 depends on CPU_FREQ && ARCH_PXA && PXA25x
990 select CPU_FREQ_DEFAULT_GOV_USERSPACE
996 menu "Floating point emulation"
998 comment "At least one emulation must be selected"
1001 bool "NWFPE math emulation"
1002 depends on !AEABI || OABI_COMPAT
1004 Say Y to include the NWFPE floating point emulator in the kernel.
1005 This is necessary to run most binaries. Linux does not currently
1006 support floating point hardware so you need to say Y here even if
1007 your machine has an FPA or floating point co-processor podule.
1009 You may say N here if you are going to load the Acorn FPEmulator
1010 early in the bootup.
1013 bool "Support extended precision"
1014 depends on FPE_NWFPE
1016 Say Y to include 80-bit support in the kernel floating-point
1017 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1018 Note that gcc does not generate 80-bit operations by default,
1019 so in most cases this option only enlarges the size of the
1020 floating point emulator without any good reason.
1022 You almost surely want to say N here.
1025 bool "FastFPE math emulation (EXPERIMENTAL)"
1026 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1028 Say Y here to include the FAST floating point emulator in the kernel.
1029 This is an experimental much faster emulator which now also has full
1030 precision for the mantissa. It does not support any exceptions.
1031 It is very simple, and approximately 3-6 times faster than NWFPE.
1033 It should be sufficient for most programs. It may be not suitable
1034 for scientific calculations, but you have to check this for yourself.
1035 If you do not feel you need a faster FP emulation you should better
1039 bool "VFP-format floating point maths"
1040 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1042 Say Y to include VFP support code in the kernel. This is needed
1043 if your hardware includes a VFP unit.
1045 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1046 release notes and additional status information.
1048 Say N if your target does not have VFP hardware.
1056 bool "Advanced SIMD (NEON) Extension support"
1057 depends on VFPv3 && CPU_V7
1059 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1064 menu "Userspace binary formats"
1066 source "fs/Kconfig.binfmt"
1069 tristate "RISC OS personality"
1072 Say Y here to include the kernel code necessary if you want to run
1073 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1074 experimental; if this sounds frightening, say N and sleep in peace.
1075 You can also say M here to compile this support as a module (which
1076 will be called arthur).
1080 menu "Power management options"
1082 source "kernel/power/Kconfig"
1084 config ARCH_SUSPEND_POSSIBLE
1089 source "net/Kconfig"
1091 menu "Device Drivers"
1093 source "drivers/base/Kconfig"
1095 source "drivers/connector/Kconfig"
1097 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1098 source "drivers/mtd/Kconfig"
1101 source "drivers/parport/Kconfig"
1103 source "drivers/pnp/Kconfig"
1105 source "drivers/block/Kconfig"
1107 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1109 source "drivers/misc/Kconfig"
1111 source "drivers/ide/Kconfig"
1113 source "drivers/scsi/Kconfig"
1115 source "drivers/ata/Kconfig"
1117 source "drivers/md/Kconfig"
1119 source "drivers/message/fusion/Kconfig"
1121 source "drivers/ieee1394/Kconfig"
1123 source "drivers/message/i2o/Kconfig"
1125 source "drivers/net/Kconfig"
1127 source "drivers/isdn/Kconfig"
1129 # input before char - char/joystick depends on it. As does USB.
1131 source "drivers/input/Kconfig"
1133 source "drivers/char/Kconfig"
1135 source "drivers/i2c/Kconfig"
1137 source "drivers/spi/Kconfig"
1139 source "drivers/gpio/Kconfig"
1141 source "drivers/w1/Kconfig"
1143 source "drivers/power/Kconfig"
1145 source "drivers/hwmon/Kconfig"
1147 source "drivers/watchdog/Kconfig"
1149 source "drivers/ssb/Kconfig"
1151 #source "drivers/l3/Kconfig"
1153 source "drivers/mfd/Kconfig"
1155 source "drivers/media/Kconfig"
1157 source "drivers/video/Kconfig"
1159 source "sound/Kconfig"
1161 source "drivers/hid/Kconfig"
1163 source "drivers/usb/Kconfig"
1165 source "drivers/mmc/Kconfig"
1167 source "drivers/leds/Kconfig"
1169 source "drivers/rtc/Kconfig"
1171 source "drivers/dma/Kconfig"
1173 source "drivers/dca/Kconfig"
1176 source "drivers/cbus/Kconfig"
1177 source "drivers/dsp/dspgateway/Kconfig"
1184 source "arch/arm/Kconfig.debug"
1186 source "security/Kconfig"
1188 source "crypto/Kconfig"
1190 source "lib/Kconfig"