2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
13 select SYS_SUPPORTS_APM_EMULATION
15 select HAVE_KPROBES if (!XIP_KERNEL)
16 select HAVE_KRETPROBES if (HAVE_KPROBES)
18 The ARM series is a line of low-power-consumption RISC chip designs
19 licensed by ARM Ltd and targeted at embedded applications and
20 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
21 manufactured, but legacy ARM-based PC hardware remains popular in
22 Europe. There is an ARM Linux project with a web page at
23 <http://www.arm.linux.org.uk/>.
25 config SYS_SUPPORTS_APM_EMULATION
36 config GENERIC_CLOCKEVENTS
40 config GENERIC_CLOCKEVENTS_BROADCAST
42 depends on GENERIC_CLOCKEVENTS
43 default y if SMP && !LOCAL_TIMERS
56 The Extended Industry Standard Architecture (EISA) bus was
57 developed as an open alternative to the IBM MicroChannel bus.
59 The EISA bus provided some of the features of the IBM MicroChannel
60 bus while maintaining backward compatibility with cards made for
61 the older ISA bus. The EISA bus saw limited use between 1988 and
62 1995 when it was made obsolete by the PCI bus.
64 Say Y here if you are building a kernel for an EISA-based machine.
74 MicroChannel Architecture is found in some IBM PS/2 machines and
75 laptops. It is a bus system similar to PCI or ISA. See
76 <file:Documentation/mca.txt> (and especially the web page given
77 there) before attempting to build an MCA bus kernel.
79 config GENERIC_HARDIRQS
83 config STACKTRACE_SUPPORT
87 config HAVE_LATENCYTOP_SUPPORT
92 config LOCKDEP_SUPPORT
96 config TRACE_IRQFLAGS_SUPPORT
100 config HARDIRQS_SW_RESEND
104 config GENERIC_IRQ_PROBE
108 config GENERIC_LOCKBREAK
111 depends on SMP && PREEMPT
113 config RWSEM_GENERIC_SPINLOCK
117 config RWSEM_XCHGADD_ALGORITHM
120 config ARCH_HAS_ILOG2_U32
124 config ARCH_HAS_ILOG2_U64
128 config GENERIC_HWEIGHT
132 config GENERIC_CALIBRATE_DELAY
136 config ARCH_SUPPORTS_AOUT
139 config ARCH_MAY_HAVE_PC_FDC
146 config GENERIC_ISA_DMA
155 config GENERIC_HARDIRQS_NO__DO_IRQ
161 config OPROFILE_ARMV6
163 depends on CPU_V6 && !SMP
164 select OPROFILE_ARM11_CORE
166 config OPROFILE_MPCORE
168 depends on CPU_V6 && SMP
169 select OPROFILE_ARM11_CORE
171 config OPROFILE_ARM11_CORE
178 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
179 default DRAM_BASE if REMAP_VECTORS_TO_RAM
182 The base address of exception vectors.
184 source "init/Kconfig"
189 prompt "ARM system type"
190 default ARCH_VERSATILE
193 bool "Agilent AAEC-2000 based"
196 This enables support for systems based on the Agilent AAEC-2000
198 config ARCH_INTEGRATOR
199 bool "ARM Ltd. Integrator family"
203 Support for ARM's Integrator platform.
206 bool "ARM Ltd. RealView family"
210 select GENERIC_CLOCKEVENTS
212 This enables support for ARM Ltd RealView boards.
214 config ARCH_VERSATILE
215 bool "ARM Ltd. Versatile family"
220 select GENERIC_CLOCKEVENTS
222 This enables support for ARM Ltd Versatile board.
228 This enables support for systems based on the Atmel AT91RM9200,
229 AT91SAM9 and AT91CAP9 processors.
232 bool "Cirrus CL-PS7500FE"
237 Support for the Cirrus Logic PS7500FE system-on-a-chip.
240 bool "Cirrus Logic CLPS711x/EP721x-based"
242 Support for Cirrus Logic 711x/721x based boards.
249 This is an evaluation board for the StrongARM processor available
250 from Digital. It has limited hardware on-board, including an
251 Ethernet interface, two PCMCIA sockets, two serial ports and a
261 This enables support for the Cirrus EP93xx series of CPUs.
263 config ARCH_FOOTBRIDGE
267 Support for systems based on the DC21285 companion chip
268 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
271 bool "Hilscher NetX based"
274 This enables support for systems based on the Hilscher NetX Soc
277 bool "Hynix HMS720x-based"
280 This enables support for systems based on the Hynix HMS720x
286 select GENERIC_CLOCKEVENTS
288 Support for Motorola's i.MX family of processors (MX1, MXL).
295 select ARCH_SUPPORTS_MSI
297 Support for Intel's IOP13XX (XScale) family of processors.
307 Support for Intel's 80219 and IOP32X (XScale) family of
318 Support for Intel's IOP33X (XScale) family of processors.
325 Support for Intel's IXP23xx (XScale) family of processors.
328 bool "IXP2400/2800-based"
332 Support for Intel's IXP2400/2800 (XScale) family of processors.
339 select GENERIC_CLOCKEVENTS
341 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 "Marvell Kirkwood"
360 select GENERIC_CLOCKEVENTS
363 Support for the following Marvell Kirkwood series SoCs:
364 88F6180, 88F6192 and 88F6281.
367 bool "Micrel/Kendin KS8695"
370 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
371 System-on-Chip devices.
374 bool "NetSilicon NS9xxx"
377 select GENERIC_CLOCKEVENTS
379 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
382 <http://www.digi.com/products/microprocessors/index.jsp>
385 bool "Marvell Loki (88RC8480)"
387 select GENERIC_CLOCKEVENTS
390 Support for the Marvell Loki (88RC8480) SoC.
393 bool "Marvell MV78xx0"
396 select GENERIC_CLOCKEVENTS
399 Support for the following Marvell MV78xx0 series SoCs:
403 bool "Freescale MXC/iMX-based"
406 Support for Freescale MXC/iMX-based family of processors
414 select GENERIC_CLOCKEVENTS
417 Support for the following Marvell Orion 5x series SoCs:
418 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
422 bool "Philips Nexperia PNX4008 Mobile"
424 This enables support for Philips PNX4008 mobile platform.
427 bool "PXA2xx/PXA3xx-based"
433 select GENERIC_CLOCKEVENTS
436 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
443 select ARCH_MAY_HAVE_PC_FDC
444 select HAVE_PATA_PLATFORM
448 On the Acorn Risc-PC, Linux can support the internal IDE disk and
449 CD-ROM interface, serial and parallel port, and the floppy drive.
454 select ARCH_DISCONTIGMEM_ENABLE
455 select ARCH_SPARSEMEM_ENABLE
456 select ARCH_SELECT_MEMORY_MODEL
460 select GENERIC_CLOCKEVENTS
464 Support for StrongARM 11x0 based boards.
467 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
470 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
471 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
472 the Samsung SMDK2410 development board (and derivatives).
480 Support for the StrongARM based Digital DNARD machine, also known
481 as "Shark" (<http://www.shark-linux.de/shark.html>).
486 Say Y here for systems based on one of the Sharp LH7A40X
487 System on a Chip processors. These CPUs include an ARM922T
488 core with a wide array of integrated devices for
489 hand-held and low-power applications.
494 select GENERIC_CLOCKEVENTS
497 Support for TI's DaVinci platform.
504 select GENERIC_CLOCKEVENTS
506 Support for TI's OMAP platform (OMAP1 and OMAP2).
509 bool "Qualcomm MSM7X00A"
511 select GENERIC_CLOCKEVENTS
513 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
514 apps processor of the MSM7X00A and depends on a shared memory
515 interface to the ARM9 modem processor which runs the baseband stack
516 and controls some vital subsystems (clock and power control, etc).
517 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
521 source "arch/arm/mach-clps711x/Kconfig"
523 source "arch/arm/mach-ep93xx/Kconfig"
525 source "arch/arm/mach-footbridge/Kconfig"
527 source "arch/arm/mach-integrator/Kconfig"
529 source "arch/arm/mach-iop32x/Kconfig"
531 source "arch/arm/mach-iop33x/Kconfig"
533 source "arch/arm/mach-iop13xx/Kconfig"
535 source "arch/arm/mach-ixp4xx/Kconfig"
537 source "arch/arm/mach-ixp2000/Kconfig"
539 source "arch/arm/mach-ixp23xx/Kconfig"
541 source "arch/arm/mach-loki/Kconfig"
543 source "arch/arm/mach-mv78xx0/Kconfig"
545 source "arch/arm/mach-pxa/Kconfig"
547 source "arch/arm/mach-sa1100/Kconfig"
549 source "arch/arm/plat-omap/Kconfig"
551 source "arch/arm/mach-omap1/Kconfig"
553 source "arch/arm/mach-omap2/Kconfig"
555 source "arch/arm/mach-orion5x/Kconfig"
557 source "arch/arm/mach-kirkwood/Kconfig"
559 source "arch/arm/plat-s3c24xx/Kconfig"
560 source "arch/arm/plat-s3c/Kconfig"
563 source "arch/arm/mach-s3c2400/Kconfig"
564 source "arch/arm/mach-s3c2410/Kconfig"
565 source "arch/arm/mach-s3c2412/Kconfig"
566 source "arch/arm/mach-s3c2440/Kconfig"
567 source "arch/arm/mach-s3c2442/Kconfig"
568 source "arch/arm/mach-s3c2443/Kconfig"
571 source "arch/arm/mach-lh7a40x/Kconfig"
573 source "arch/arm/mach-imx/Kconfig"
575 source "arch/arm/mach-h720x/Kconfig"
577 source "arch/arm/mach-versatile/Kconfig"
579 source "arch/arm/mach-aaec2000/Kconfig"
581 source "arch/arm/mach-realview/Kconfig"
583 source "arch/arm/mach-at91/Kconfig"
585 source "arch/arm/plat-mxc/Kconfig"
587 source "arch/arm/mach-netx/Kconfig"
589 source "arch/arm/mach-ns9xxx/Kconfig"
591 source "arch/arm/mach-davinci/Kconfig"
593 source "arch/arm/mach-ks8695/Kconfig"
595 source "arch/arm/mach-msm/Kconfig"
597 # Definitions to make life easier
607 source arch/arm/mm/Kconfig
610 bool "Enable iWMMXt support"
611 depends on CPU_XSCALE || CPU_XSC3
612 default y if PXA27x || PXA3xx
614 Enable support for iWMMXt context switching at run time if
615 running on a CPU that supports it.
617 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
620 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
624 source "arch/arm/Kconfig-nommu"
629 source "arch/arm/common/Kconfig"
631 config FORCE_MAX_ZONEORDER
644 Find out whether you have ISA slots on your motherboard. ISA is the
645 name of a bus system, i.e. the way the CPU talks to the other stuff
646 inside your box. Other bus systems are PCI, EISA, MicroChannel
647 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
648 newer boards don't support it. If you have ISA, say Y, otherwise N.
650 # Select ISA DMA controller support
655 # Select ISA DMA interface
660 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
662 Find out whether you have a PCI motherboard. PCI is the name of a
663 bus system, i.e. the way the CPU talks to the other stuff inside
664 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
665 VESA. If you have PCI, say Y, otherwise N.
670 # Select the host bridge type
671 config PCI_HOST_VIA82C505
673 depends on PCI && ARCH_SHARK
676 config PCI_HOST_ITE8152
678 depends on PCI && MACH_ARMCORE
682 source "drivers/pci/Kconfig"
684 source "drivers/pcmcia/Kconfig"
688 menu "Kernel Features"
690 source "kernel/time/Kconfig"
693 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
694 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
696 This enables support for systems with more than one CPU. If you have
697 a system with only one CPU, like most personal computers, say N. If
698 you have a system with more than one CPU, say Y.
700 If you say N here, the kernel will run on single and multiprocessor
701 machines, but will use only one CPU of a multiprocessor machine. If
702 you say Y here, the kernel will run on many, but not all, single
703 processor machines. On a single processor machine, the kernel will
704 run faster if you say N here.
706 See also <file:Documentation/i386/IO-APIC.txt>,
707 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
708 <http://www.linuxdoc.org/docs.html#howto>.
710 If you don't know what to do here, say N.
713 int "Maximum number of CPUs (2-32)"
719 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
720 depends on SMP && HOTPLUG && EXPERIMENTAL
722 Say Y here to experiment with turning CPUs off and on. CPUs
723 can be controlled through /sys/devices/system/cpu.
726 bool "Use local timer interrupts"
727 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
730 Enable support for local timers on SMP platforms, rather then the
731 legacy IPI broadcast method. Local timers allows the system
732 accounting to be spread across the timer interval, preventing a
733 "thundering herd" at every timer tick.
736 bool "Preemptible Kernel (EXPERIMENTAL)"
737 depends on EXPERIMENTAL
739 This option reduces the latency of the kernel when reacting to
740 real-time or interactive events by allowing a low priority process to
741 be preempted even if it is in kernel mode executing a system call.
742 This allows applications to run more reliably even when the system is
745 Say Y here if you are building a kernel for a desktop, embedded
746 or real-time system. Say N if you are unsure.
750 default 128 if ARCH_L7200
751 default 200 if ARCH_EBSA110 || ARCH_S3C2410
752 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
753 default AT91_TIMER_HZ if ARCH_AT91
757 bool "Use the ARM EABI to compile the kernel"
759 This option allows for the kernel to be compiled using the latest
760 ARM ABI (aka EABI). This is only useful if you are using a user
761 space environment that is also compiled with EABI.
763 Since there are major incompatibilities between the legacy ABI and
764 EABI, especially with regard to structure member alignment, this
765 option also changes the kernel syscall calling convention to
766 disambiguate both ABIs and allow for backward compatibility support
767 (selected with CONFIG_OABI_COMPAT).
769 To use this you need GCC version 4.0.0 or later.
772 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
773 depends on AEABI && EXPERIMENTAL
776 This option preserves the old syscall interface along with the
777 new (ARM EABI) one. It also provides a compatibility layer to
778 intercept syscalls that have structure arguments which layout
779 in memory differs between the legacy ABI and the new ARM EABI
780 (only for non "thumb" binaries). This option adds a tiny
781 overhead to all syscalls and produces a slightly larger kernel.
782 If you know you'll be using only pure EABI user space then you
783 can say N here. If this option is not selected and you attempt
784 to execute a legacy ABI binary then the result will be
785 UNPREDICTABLE (in fact it can be predicted that it won't work
786 at all). If in doubt say Y.
788 config ARCH_DISCONTIGMEM_ENABLE
790 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
792 Say Y to support efficient handling of discontiguous physical memory,
793 for architectures which are either NUMA (Non-Uniform Memory Access)
794 or have huge holes in the physical address space for other reasons.
795 See <file:Documentation/vm/numa> for more.
797 config ARCH_SPARSEMEM_ENABLE
800 config ARCH_SELECT_MEMORY_MODEL
805 default "4" if ARCH_LH7A40X
807 depends on NEED_MULTIPLE_NODES
812 bool "Timer and CPU usage LEDs"
813 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
814 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
815 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
816 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
817 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
818 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
819 ARCH_KS8695 || MACH_RD88F5182
821 If you say Y here, the LEDs on your machine will be used
822 to provide useful information about your current system status.
824 If you are compiling a kernel for a NetWinder or EBSA-285, you will
825 be able to select which LEDs are active using the options below. If
826 you are compiling a kernel for the EBSA-110 or the LART however, the
827 red LED will simply flash regularly to indicate that the system is
828 still functional. It is safe to say Y here if you have a CATS
829 system, but the driver will do nothing.
832 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
833 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
834 || MACH_OMAP_PERSEUS2
836 depends on !GENERIC_CLOCKEVENTS
837 default y if ARCH_EBSA110
839 If you say Y here, one of the system LEDs (the green one on the
840 NetWinder, the amber one on the EBSA285, or the red one on the LART)
841 will flash regularly to indicate that the system is still
842 operational. This is mainly useful to kernel hackers who are
843 debugging unstable kernels.
845 The LART uses the same LED for both Timer LED and CPU usage LED
846 functions. You may choose to use both, but the Timer LED function
847 will overrule the CPU usage LED.
850 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
852 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
853 || MACH_OMAP_PERSEUS2
856 If you say Y here, the red LED will be used to give a good real
857 time indication of CPU usage, by lighting whenever the idle task
858 is not currently executing.
860 The LART uses the same LED for both Timer LED and CPU usage LED
861 functions. You may choose to use both, but the Timer LED function
862 will overrule the CPU usage LED.
864 config ALIGNMENT_TRAP
866 depends on CPU_CP15_MMU
867 default y if !ARCH_EBSA110
869 ARM processors cannot fetch/store information which is not
870 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
871 address divisible by 4. On 32-bit ARM processors, these non-aligned
872 fetch/store instructions will be emulated in software if you say
873 here, which has a severe performance impact. This is necessary for
874 correct operation of some network protocols. With an IP-only
875 configuration it is safe to say N, otherwise say Y.
881 # Compressed boot loader in ROM. Yes, we really want to ask about
882 # TEXT and BSS so we preserve their values in the config files.
883 config ZBOOT_ROM_TEXT
884 hex "Compressed ROM boot loader base address"
887 The physical address at which the ROM-able zImage is to be
888 placed in the target. Platforms which normally make use of
889 ROM-able zImage formats normally set this to a suitable
890 value in their defconfig file.
892 If ZBOOT_ROM is not enabled, this has no effect.
895 hex "Compressed ROM boot loader BSS address"
898 The base address of an area of read/write memory in the target
899 for the ROM-able zImage which must be available while the
900 decompressor is running. It must be large enough to hold the
901 entire decompressed kernel plus an additional 128 KiB.
902 Platforms which normally make use of ROM-able zImage formats
903 normally set this to a suitable value in their defconfig file.
905 If ZBOOT_ROM is not enabled, this has no effect.
908 bool "Compressed boot loader in ROM/flash"
909 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
911 Say Y here if you intend to execute your compressed kernel image
912 (zImage) directly from ROM or flash. If unsure, say N.
915 string "Default kernel command string"
918 On some architectures (EBSA110 and CATS), there is currently no way
919 for the boot loader to pass arguments to the kernel. For these
920 architectures, you should supply some command-line options at build
921 time by entering them here. As a minimum, you should specify the
922 memory size and the root device (e.g., mem=64M root=/dev/nfs).
925 bool "Kernel Execute-In-Place from ROM"
926 depends on !ZBOOT_ROM
928 Execute-In-Place allows the kernel to run from non-volatile storage
929 directly addressable by the CPU, such as NOR flash. This saves RAM
930 space since the text section of the kernel is not loaded from flash
931 to RAM. Read-write sections, such as the data section and stack,
932 are still copied to RAM. The XIP kernel is not compressed since
933 it has to run directly from flash, so it will take more space to
934 store it. The flash address used to link the kernel object files,
935 and for storing it, is configuration dependent. Therefore, if you
936 say Y here, you must know the proper physical address where to
937 store the kernel image depending on your own flash memory usage.
939 Also note that the make target becomes "make xipImage" rather than
940 "make zImage" or "make Image". The final kernel binary to put in
941 ROM memory will be arch/arm/boot/xipImage.
946 hex "XIP Kernel Physical Location"
947 depends on XIP_KERNEL
950 This is the physical address in your flash memory the kernel will
951 be linked for and stored to. This address is dependent on your
955 bool "Kexec system call (EXPERIMENTAL)"
956 depends on EXPERIMENTAL
958 kexec is a system call that implements the ability to shutdown your
959 current kernel, and to start another kernel. It is like a reboot
960 but it is independent of the system firmware. And like a reboot
961 you can start any kernel with it, not just Linux.
963 It is an ongoing process to be certain the hardware in a machine
964 is properly shutdown, so do not be surprised if this code does not
965 initially work for you. It may help to enable device hotplugging
969 bool "Export atags in procfs"
973 Should the atags used to boot the kernel be exported in an "atags"
974 file in procfs. Useful with kexec.
978 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
980 menu "CPU Frequency scaling"
982 source "drivers/cpufreq/Kconfig"
984 config CPU_FREQ_SA1100
986 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
989 config CPU_FREQ_SA1110
991 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
994 config CPU_FREQ_INTEGRATOR
995 tristate "CPUfreq driver for ARM Integrator CPUs"
996 depends on ARCH_INTEGRATOR && CPU_FREQ
999 This enables the CPUfreq driver for ARM Integrator CPUs.
1001 For details, take a look at <file:Documentation/cpu-freq>.
1006 tristate "CPUfreq driver for i.MX CPUs"
1007 depends on ARCH_IMX && CPU_FREQ
1010 This enables the CPUfreq driver for i.MX CPUs.
1016 depends on CPU_FREQ && ARCH_PXA && PXA25x
1018 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1024 menu "Floating point emulation"
1026 comment "At least one emulation must be selected"
1029 bool "NWFPE math emulation"
1030 depends on !AEABI || OABI_COMPAT
1032 Say Y to include the NWFPE floating point emulator in the kernel.
1033 This is necessary to run most binaries. Linux does not currently
1034 support floating point hardware so you need to say Y here even if
1035 your machine has an FPA or floating point co-processor podule.
1037 You may say N here if you are going to load the Acorn FPEmulator
1038 early in the bootup.
1041 bool "Support extended precision"
1042 depends on FPE_NWFPE
1044 Say Y to include 80-bit support in the kernel floating-point
1045 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1046 Note that gcc does not generate 80-bit operations by default,
1047 so in most cases this option only enlarges the size of the
1048 floating point emulator without any good reason.
1050 You almost surely want to say N here.
1053 bool "FastFPE math emulation (EXPERIMENTAL)"
1054 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1056 Say Y here to include the FAST floating point emulator in the kernel.
1057 This is an experimental much faster emulator which now also has full
1058 precision for the mantissa. It does not support any exceptions.
1059 It is very simple, and approximately 3-6 times faster than NWFPE.
1061 It should be sufficient for most programs. It may be not suitable
1062 for scientific calculations, but you have to check this for yourself.
1063 If you do not feel you need a faster FP emulation you should better
1067 bool "VFP-format floating point maths"
1068 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1070 Say Y to include VFP support code in the kernel. This is needed
1071 if your hardware includes a VFP unit.
1073 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1074 release notes and additional status information.
1076 Say N if your target does not have VFP hardware.
1084 bool "Advanced SIMD (NEON) Extension support"
1085 depends on VFPv3 && CPU_V7
1087 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1092 menu "Userspace binary formats"
1094 source "fs/Kconfig.binfmt"
1097 tristate "RISC OS personality"
1100 Say Y here to include the kernel code necessary if you want to run
1101 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1102 experimental; if this sounds frightening, say N and sleep in peace.
1103 You can also say M here to compile this support as a module (which
1104 will be called arthur).
1108 menu "Power management options"
1110 source "kernel/power/Kconfig"
1112 config ARCH_SUSPEND_POSSIBLE
1117 source "net/Kconfig"
1119 menu "Device Drivers"
1121 source "drivers/base/Kconfig"
1123 source "drivers/connector/Kconfig"
1125 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1126 source "drivers/mtd/Kconfig"
1129 source "drivers/parport/Kconfig"
1131 source "drivers/pnp/Kconfig"
1133 source "drivers/block/Kconfig"
1135 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1137 source "drivers/misc/Kconfig"
1139 source "drivers/ide/Kconfig"
1141 source "drivers/scsi/Kconfig"
1143 source "drivers/ata/Kconfig"
1145 source "drivers/md/Kconfig"
1147 source "drivers/message/fusion/Kconfig"
1149 source "drivers/ieee1394/Kconfig"
1151 source "drivers/message/i2o/Kconfig"
1153 source "drivers/net/Kconfig"
1155 source "drivers/isdn/Kconfig"
1157 # input before char - char/joystick depends on it. As does USB.
1159 source "drivers/input/Kconfig"
1161 source "drivers/char/Kconfig"
1163 source "drivers/i2c/Kconfig"
1165 source "drivers/spi/Kconfig"
1167 source "drivers/gpio/Kconfig"
1169 source "drivers/w1/Kconfig"
1171 source "drivers/power/Kconfig"
1173 source "drivers/hwmon/Kconfig"
1175 source "drivers/watchdog/Kconfig"
1177 source "drivers/ssb/Kconfig"
1179 #source "drivers/l3/Kconfig"
1181 source "drivers/mfd/Kconfig"
1183 source "drivers/media/Kconfig"
1185 source "drivers/video/Kconfig"
1187 source "sound/Kconfig"
1189 source "drivers/hid/Kconfig"
1191 source "drivers/usb/Kconfig"
1193 source "drivers/mmc/Kconfig"
1195 source "drivers/leds/Kconfig"
1197 source "drivers/rtc/Kconfig"
1199 source "drivers/dma/Kconfig"
1201 source "drivers/dca/Kconfig"
1203 source "drivers/uio/Kconfig"
1209 source "arch/arm/Kconfig.debug"
1211 source "security/Kconfig"
1213 source "crypto/Kconfig"
1215 source "lib/Kconfig"