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
16 select HAVE_KPROBES if (!XIP_KERNEL)
17 select HAVE_KRETPROBES if (HAVE_KPROBES)
18 select HAVE_FTRACE if (!XIP_KERNEL)
19 select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE)
21 The ARM series is a line of low-power-consumption RISC chip designs
22 licensed by ARM Ltd and targeted at embedded applications and
23 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
24 manufactured, but legacy ARM-based PC hardware remains popular in
25 Europe. There is an ARM Linux project with a web page at
26 <http://www.arm.linux.org.uk/>.
31 config SYS_SUPPORTS_APM_EMULATION
42 config GENERIC_CLOCKEVENTS
46 config GENERIC_CLOCKEVENTS_BROADCAST
48 depends on GENERIC_CLOCKEVENTS
49 default y if SMP && !LOCAL_TIMERS
62 The Extended Industry Standard Architecture (EISA) bus was
63 developed as an open alternative to the IBM MicroChannel bus.
65 The EISA bus provided some of the features of the IBM MicroChannel
66 bus while maintaining backward compatibility with cards made for
67 the older ISA bus. The EISA bus saw limited use between 1988 and
68 1995 when it was made obsolete by the PCI bus.
70 Say Y here if you are building a kernel for an EISA-based machine.
80 MicroChannel Architecture is found in some IBM PS/2 machines and
81 laptops. It is a bus system similar to PCI or ISA. See
82 <file:Documentation/mca.txt> (and especially the web page given
83 there) before attempting to build an MCA bus kernel.
85 config GENERIC_HARDIRQS
89 config STACKTRACE_SUPPORT
93 config HAVE_LATENCYTOP_SUPPORT
98 config LOCKDEP_SUPPORT
102 config TRACE_IRQFLAGS_SUPPORT
106 config HARDIRQS_SW_RESEND
110 config GENERIC_IRQ_PROBE
114 config GENERIC_LOCKBREAK
117 depends on SMP && PREEMPT
119 config RWSEM_GENERIC_SPINLOCK
123 config RWSEM_XCHGADD_ALGORITHM
126 config ARCH_HAS_ILOG2_U32
130 config ARCH_HAS_ILOG2_U64
134 config GENERIC_HWEIGHT
138 config GENERIC_CALIBRATE_DELAY
142 config ARCH_SUPPORTS_AOUT
145 config ARCH_MAY_HAVE_PC_FDC
152 config GENERIC_ISA_DMA
161 config GENERIC_HARDIRQS_NO__DO_IRQ
167 config OPROFILE_ARMV6
169 depends on CPU_V6 && !SMP
170 select OPROFILE_ARM11_CORE
172 config OPROFILE_MPCORE
174 depends on CPU_V6 && SMP
175 select OPROFILE_ARM11_CORE
177 config OPROFILE_ARM11_CORE
184 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
185 default DRAM_BASE if REMAP_VECTORS_TO_RAM
188 The base address of exception vectors.
190 source "init/Kconfig"
195 prompt "ARM system type"
196 default ARCH_VERSATILE
199 bool "Agilent AAEC-2000 based"
202 This enables support for systems based on the Agilent AAEC-2000
204 config ARCH_INTEGRATOR
205 bool "ARM Ltd. Integrator family"
209 Support for ARM's Integrator platform.
212 bool "ARM Ltd. RealView family"
216 select GENERIC_CLOCKEVENTS
218 This enables support for ARM Ltd RealView boards.
220 config ARCH_VERSATILE
221 bool "ARM Ltd. Versatile family"
226 select GENERIC_CLOCKEVENTS
228 This enables support for ARM Ltd Versatile board.
234 This enables support for systems based on the Atmel AT91RM9200,
235 AT91SAM9 and AT91CAP9 processors.
238 bool "Cirrus CL-PS7500FE"
243 Support for the Cirrus Logic PS7500FE system-on-a-chip.
246 bool "Cirrus Logic CLPS711x/EP721x-based"
248 Support for Cirrus Logic 711x/721x based boards.
255 This is an evaluation board for the StrongARM processor available
256 from Digital. It has limited hardware on-board, including an
257 Ethernet interface, two PCMCIA sockets, two serial ports and a
267 This enables support for the Cirrus EP93xx series of CPUs.
269 config ARCH_FOOTBRIDGE
273 Support for systems based on the DC21285 companion chip
274 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
277 bool "Hilscher NetX based"
280 This enables support for systems based on the Hilscher NetX Soc
283 bool "Hynix HMS720x-based"
286 This enables support for systems based on the Hynix HMS720x
292 select GENERIC_CLOCKEVENTS
294 Support for Motorola's i.MX family of processors (MX1, MXL).
301 select ARCH_SUPPORTS_MSI
303 Support for Intel's IOP13XX (XScale) family of processors.
313 Support for Intel's 80219 and IOP32X (XScale) family of
324 Support for Intel's IOP33X (XScale) family of processors.
331 Support for Intel's IXP23xx (XScale) family of processors.
334 bool "IXP2400/2800-based"
338 Support for Intel's IXP2400/2800 (XScale) family of processors.
345 select GENERIC_CLOCKEVENTS
347 Support for Intel's IXP4XX (XScale) family of processors.
353 Say Y here if you intend to run this kernel on a LinkUp Systems
354 L7200 Software Development Board which uses an ARM720T processor.
355 Information on this board can be obtained at:
357 <http://www.linkupsys.com/>
359 If you have any questions or comments about the Linux kernel port
360 to this board, send e-mail to <sjhill@cotw.com>.
363 bool "Marvell Kirkwood"
366 select GENERIC_CLOCKEVENTS
369 Support for the following Marvell Kirkwood series SoCs:
370 88F6180, 88F6192 and 88F6281.
373 bool "Micrel/Kendin KS8695"
376 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
377 System-on-Chip devices.
380 bool "NetSilicon NS9xxx"
383 select GENERIC_CLOCKEVENTS
385 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
388 <http://www.digi.com/products/microprocessors/index.jsp>
391 bool "Marvell Loki (88RC8480)"
393 select GENERIC_CLOCKEVENTS
396 Support for the Marvell Loki (88RC8480) SoC.
399 bool "Marvell MV78xx0"
402 select GENERIC_CLOCKEVENTS
405 Support for the following Marvell MV78xx0 series SoCs:
409 bool "Freescale MXC/iMX-based"
411 select GENERIC_CLOCKEVENTS
416 Support for Freescale MXC/iMX-based family of processors
424 select GENERIC_CLOCKEVENTS
427 Support for the following Marvell Orion 5x series SoCs:
428 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
432 bool "Philips Nexperia PNX4008 Mobile"
434 This enables support for Philips PNX4008 mobile platform.
437 bool "PXA2xx/PXA3xx-based"
443 select GENERIC_CLOCKEVENTS
446 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
453 select ARCH_MAY_HAVE_PC_FDC
454 select HAVE_PATA_PLATFORM
458 On the Acorn Risc-PC, Linux can support the internal IDE disk and
459 CD-ROM interface, serial and parallel port, and the floppy drive.
464 select ARCH_DISCONTIGMEM_ENABLE
465 select ARCH_SPARSEMEM_ENABLE
466 select ARCH_SELECT_MEMORY_MODEL
470 select GENERIC_CLOCKEVENTS
474 Support for StrongARM 11x0 based boards.
477 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
480 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
481 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
482 the Samsung SMDK2410 development board (and derivatives).
490 Support for the StrongARM based Digital DNARD machine, also known
491 as "Shark" (<http://www.shark-linux.de/shark.html>).
496 Say Y here for systems based on one of the Sharp LH7A40X
497 System on a Chip processors. These CPUs include an ARM922T
498 core with a wide array of integrated devices for
499 hand-held and low-power applications.
504 select GENERIC_CLOCKEVENTS
507 Support for TI's DaVinci platform.
514 select GENERIC_CLOCKEVENTS
516 Support for TI's OMAP platform (OMAP1 and OMAP2).
519 bool "Qualcomm MSM7X00A"
521 select GENERIC_CLOCKEVENTS
523 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
524 apps processor of the MSM7X00A and depends on a shared memory
525 interface to the ARM9 modem processor which runs the baseband stack
526 and controls some vital subsystems (clock and power control, etc).
527 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
531 source "arch/arm/mach-clps711x/Kconfig"
533 source "arch/arm/mach-ep93xx/Kconfig"
535 source "arch/arm/mach-footbridge/Kconfig"
537 source "arch/arm/mach-integrator/Kconfig"
539 source "arch/arm/mach-iop32x/Kconfig"
541 source "arch/arm/mach-iop33x/Kconfig"
543 source "arch/arm/mach-iop13xx/Kconfig"
545 source "arch/arm/mach-ixp4xx/Kconfig"
547 source "arch/arm/mach-ixp2000/Kconfig"
549 source "arch/arm/mach-ixp23xx/Kconfig"
551 source "arch/arm/mach-loki/Kconfig"
553 source "arch/arm/mach-mv78xx0/Kconfig"
555 source "arch/arm/mach-pxa/Kconfig"
557 source "arch/arm/mach-sa1100/Kconfig"
559 source "arch/arm/plat-omap/Kconfig"
561 source "arch/arm/mach-omap1/Kconfig"
563 source "arch/arm/mach-omap2/Kconfig"
565 source "arch/arm/mach-orion5x/Kconfig"
567 source "arch/arm/mach-kirkwood/Kconfig"
569 source "arch/arm/plat-s3c24xx/Kconfig"
570 source "arch/arm/plat-s3c/Kconfig"
573 source "arch/arm/mach-s3c2400/Kconfig"
574 source "arch/arm/mach-s3c2410/Kconfig"
575 source "arch/arm/mach-s3c2412/Kconfig"
576 source "arch/arm/mach-s3c2440/Kconfig"
577 source "arch/arm/mach-s3c2442/Kconfig"
578 source "arch/arm/mach-s3c2443/Kconfig"
581 source "arch/arm/mach-lh7a40x/Kconfig"
583 source "arch/arm/mach-imx/Kconfig"
585 source "arch/arm/mach-h720x/Kconfig"
587 source "arch/arm/mach-versatile/Kconfig"
589 source "arch/arm/mach-aaec2000/Kconfig"
591 source "arch/arm/mach-realview/Kconfig"
593 source "arch/arm/mach-at91/Kconfig"
595 source "arch/arm/plat-mxc/Kconfig"
597 source "arch/arm/mach-netx/Kconfig"
599 source "arch/arm/mach-ns9xxx/Kconfig"
601 source "arch/arm/mach-davinci/Kconfig"
603 source "arch/arm/mach-ks8695/Kconfig"
605 source "arch/arm/mach-msm/Kconfig"
607 # Definitions to make life easier
617 source arch/arm/mm/Kconfig
620 bool "Enable iWMMXt support"
621 depends on CPU_XSCALE || CPU_XSC3
622 default y if PXA27x || PXA3xx
624 Enable support for iWMMXt context switching at run time if
625 running on a CPU that supports it.
627 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
630 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
634 source "arch/arm/Kconfig-nommu"
639 source "arch/arm/common/Kconfig"
641 config FORCE_MAX_ZONEORDER
654 Find out whether you have ISA slots on your motherboard. ISA is the
655 name of a bus system, i.e. the way the CPU talks to the other stuff
656 inside your box. Other bus systems are PCI, EISA, MicroChannel
657 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
658 newer boards don't support it. If you have ISA, say Y, otherwise N.
660 # Select ISA DMA controller support
665 # Select ISA DMA interface
670 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
672 Find out whether you have a PCI motherboard. PCI is the name of a
673 bus system, i.e. the way the CPU talks to the other stuff inside
674 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
675 VESA. If you have PCI, say Y, otherwise N.
680 # Select the host bridge type
681 config PCI_HOST_VIA82C505
683 depends on PCI && ARCH_SHARK
686 config PCI_HOST_ITE8152
688 depends on PCI && MACH_ARMCORE
692 source "drivers/pci/Kconfig"
694 source "drivers/pcmcia/Kconfig"
698 menu "Kernel Features"
700 source "kernel/time/Kconfig"
703 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
704 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
705 select USE_GENERIC_SMP_HELPERS
707 This enables support for systems with more than one CPU. If you have
708 a system with only one CPU, like most personal computers, say N. If
709 you have a system with more than one CPU, say Y.
711 If you say N here, the kernel will run on single and multiprocessor
712 machines, but will use only one CPU of a multiprocessor machine. If
713 you say Y here, the kernel will run on many, but not all, single
714 processor machines. On a single processor machine, the kernel will
715 run faster if you say N here.
717 See also <file:Documentation/i386/IO-APIC.txt>,
718 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
719 <http://www.linuxdoc.org/docs.html#howto>.
721 If you don't know what to do here, say N.
724 int "Maximum number of CPUs (2-32)"
730 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
731 depends on SMP && HOTPLUG && EXPERIMENTAL
733 Say Y here to experiment with turning CPUs off and on. CPUs
734 can be controlled through /sys/devices/system/cpu.
737 bool "Use local timer interrupts"
738 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
741 Enable support for local timers on SMP platforms, rather then the
742 legacy IPI broadcast method. Local timers allows the system
743 accounting to be spread across the timer interval, preventing a
744 "thundering herd" at every timer tick.
747 bool "Preemptible Kernel (EXPERIMENTAL)"
748 depends on EXPERIMENTAL
750 This option reduces the latency of the kernel when reacting to
751 real-time or interactive events by allowing a low priority process to
752 be preempted even if it is in kernel mode executing a system call.
753 This allows applications to run more reliably even when the system is
756 Say Y here if you are building a kernel for a desktop, embedded
757 or real-time system. Say N if you are unsure.
761 default 128 if ARCH_L7200
762 default 200 if ARCH_EBSA110 || ARCH_S3C2410
763 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
764 default AT91_TIMER_HZ if ARCH_AT91
768 bool "Use the ARM EABI to compile the kernel"
770 This option allows for the kernel to be compiled using the latest
771 ARM ABI (aka EABI). This is only useful if you are using a user
772 space environment that is also compiled with EABI.
774 Since there are major incompatibilities between the legacy ABI and
775 EABI, especially with regard to structure member alignment, this
776 option also changes the kernel syscall calling convention to
777 disambiguate both ABIs and allow for backward compatibility support
778 (selected with CONFIG_OABI_COMPAT).
780 To use this you need GCC version 4.0.0 or later.
783 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
784 depends on AEABI && EXPERIMENTAL
787 This option preserves the old syscall interface along with the
788 new (ARM EABI) one. It also provides a compatibility layer to
789 intercept syscalls that have structure arguments which layout
790 in memory differs between the legacy ABI and the new ARM EABI
791 (only for non "thumb" binaries). This option adds a tiny
792 overhead to all syscalls and produces a slightly larger kernel.
793 If you know you'll be using only pure EABI user space then you
794 can say N here. If this option is not selected and you attempt
795 to execute a legacy ABI binary then the result will be
796 UNPREDICTABLE (in fact it can be predicted that it won't work
797 at all). If in doubt say Y.
799 config ARCH_DISCONTIGMEM_ENABLE
801 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
803 Say Y to support efficient handling of discontiguous physical memory,
804 for architectures which are either NUMA (Non-Uniform Memory Access)
805 or have huge holes in the physical address space for other reasons.
806 See <file:Documentation/vm/numa> for more.
808 config ARCH_SPARSEMEM_ENABLE
811 config ARCH_SELECT_MEMORY_MODEL
816 default "4" if ARCH_LH7A40X
818 depends on NEED_MULTIPLE_NODES
823 bool "Timer and CPU usage LEDs"
824 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
825 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
826 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
827 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
828 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
829 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
830 ARCH_KS8695 || MACH_RD88F5182
832 If you say Y here, the LEDs on your machine will be used
833 to provide useful information about your current system status.
835 If you are compiling a kernel for a NetWinder or EBSA-285, you will
836 be able to select which LEDs are active using the options below. If
837 you are compiling a kernel for the EBSA-110 or the LART however, the
838 red LED will simply flash regularly to indicate that the system is
839 still functional. It is safe to say Y here if you have a CATS
840 system, but the driver will do nothing.
843 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
844 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
845 || MACH_OMAP_PERSEUS2
847 depends on !GENERIC_CLOCKEVENTS
848 default y if ARCH_EBSA110
850 If you say Y here, one of the system LEDs (the green one on the
851 NetWinder, the amber one on the EBSA285, or the red one on the LART)
852 will flash regularly to indicate that the system is still
853 operational. This is mainly useful to kernel hackers who are
854 debugging unstable kernels.
856 The LART uses the same LED for both Timer LED and CPU usage LED
857 functions. You may choose to use both, but the Timer LED function
858 will overrule the CPU usage LED.
861 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
863 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
864 || MACH_OMAP_PERSEUS2
867 If you say Y here, the red LED will be used to give a good real
868 time indication of CPU usage, by lighting whenever the idle task
869 is not currently executing.
871 The LART uses the same LED for both Timer LED and CPU usage LED
872 functions. You may choose to use both, but the Timer LED function
873 will overrule the CPU usage LED.
875 config ALIGNMENT_TRAP
877 depends on CPU_CP15_MMU
878 default y if !ARCH_EBSA110
880 ARM processors cannot fetch/store information which is not
881 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
882 address divisible by 4. On 32-bit ARM processors, these non-aligned
883 fetch/store instructions will be emulated in software if you say
884 here, which has a severe performance impact. This is necessary for
885 correct operation of some network protocols. With an IP-only
886 configuration it is safe to say N, otherwise say Y.
892 # Compressed boot loader in ROM. Yes, we really want to ask about
893 # TEXT and BSS so we preserve their values in the config files.
894 config ZBOOT_ROM_TEXT
895 hex "Compressed ROM boot loader base address"
898 The physical address at which the ROM-able zImage is to be
899 placed in the target. Platforms which normally make use of
900 ROM-able zImage formats normally set this to a suitable
901 value in their defconfig file.
903 If ZBOOT_ROM is not enabled, this has no effect.
906 hex "Compressed ROM boot loader BSS address"
909 The base address of an area of read/write memory in the target
910 for the ROM-able zImage which must be available while the
911 decompressor is running. It must be large enough to hold the
912 entire decompressed kernel plus an additional 128 KiB.
913 Platforms which normally make use of ROM-able zImage formats
914 normally set this to a suitable value in their defconfig file.
916 If ZBOOT_ROM is not enabled, this has no effect.
919 bool "Compressed boot loader in ROM/flash"
920 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
922 Say Y here if you intend to execute your compressed kernel image
923 (zImage) directly from ROM or flash. If unsure, say N.
926 string "Default kernel command string"
929 On some architectures (EBSA110 and CATS), there is currently no way
930 for the boot loader to pass arguments to the kernel. For these
931 architectures, you should supply some command-line options at build
932 time by entering them here. As a minimum, you should specify the
933 memory size and the root device (e.g., mem=64M root=/dev/nfs).
936 bool "Kernel Execute-In-Place from ROM"
937 depends on !ZBOOT_ROM
939 Execute-In-Place allows the kernel to run from non-volatile storage
940 directly addressable by the CPU, such as NOR flash. This saves RAM
941 space since the text section of the kernel is not loaded from flash
942 to RAM. Read-write sections, such as the data section and stack,
943 are still copied to RAM. The XIP kernel is not compressed since
944 it has to run directly from flash, so it will take more space to
945 store it. The flash address used to link the kernel object files,
946 and for storing it, is configuration dependent. Therefore, if you
947 say Y here, you must know the proper physical address where to
948 store the kernel image depending on your own flash memory usage.
950 Also note that the make target becomes "make xipImage" rather than
951 "make zImage" or "make Image". The final kernel binary to put in
952 ROM memory will be arch/arm/boot/xipImage.
957 hex "XIP Kernel Physical Location"
958 depends on XIP_KERNEL
961 This is the physical address in your flash memory the kernel will
962 be linked for and stored to. This address is dependent on your
966 bool "Kexec system call (EXPERIMENTAL)"
967 depends on EXPERIMENTAL
969 kexec is a system call that implements the ability to shutdown your
970 current kernel, and to start another kernel. It is like a reboot
971 but it is independent of the system firmware. And like a reboot
972 you can start any kernel with it, not just Linux.
974 It is an ongoing process to be certain the hardware in a machine
975 is properly shutdown, so do not be surprised if this code does not
976 initially work for you. It may help to enable device hotplugging
980 bool "Export atags in procfs"
984 Should the atags used to boot the kernel be exported in an "atags"
985 file in procfs. Useful with kexec.
989 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
991 menu "CPU Frequency scaling"
993 source "drivers/cpufreq/Kconfig"
995 config CPU_FREQ_SA1100
997 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1000 config CPU_FREQ_SA1110
1002 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1005 config CPU_FREQ_INTEGRATOR
1006 tristate "CPUfreq driver for ARM Integrator CPUs"
1007 depends on ARCH_INTEGRATOR && CPU_FREQ
1010 This enables the CPUfreq driver for ARM Integrator CPUs.
1012 For details, take a look at <file:Documentation/cpu-freq>.
1017 tristate "CPUfreq driver for i.MX CPUs"
1018 depends on ARCH_IMX && CPU_FREQ
1021 This enables the CPUfreq driver for i.MX CPUs.
1027 depends on CPU_FREQ && ARCH_PXA && PXA25x
1029 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1035 menu "Floating point emulation"
1037 comment "At least one emulation must be selected"
1040 bool "NWFPE math emulation"
1041 depends on !AEABI || OABI_COMPAT
1043 Say Y to include the NWFPE floating point emulator in the kernel.
1044 This is necessary to run most binaries. Linux does not currently
1045 support floating point hardware so you need to say Y here even if
1046 your machine has an FPA or floating point co-processor podule.
1048 You may say N here if you are going to load the Acorn FPEmulator
1049 early in the bootup.
1052 bool "Support extended precision"
1053 depends on FPE_NWFPE
1055 Say Y to include 80-bit support in the kernel floating-point
1056 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1057 Note that gcc does not generate 80-bit operations by default,
1058 so in most cases this option only enlarges the size of the
1059 floating point emulator without any good reason.
1061 You almost surely want to say N here.
1064 bool "FastFPE math emulation (EXPERIMENTAL)"
1065 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1067 Say Y here to include the FAST floating point emulator in the kernel.
1068 This is an experimental much faster emulator which now also has full
1069 precision for the mantissa. It does not support any exceptions.
1070 It is very simple, and approximately 3-6 times faster than NWFPE.
1072 It should be sufficient for most programs. It may be not suitable
1073 for scientific calculations, but you have to check this for yourself.
1074 If you do not feel you need a faster FP emulation you should better
1078 bool "VFP-format floating point maths"
1079 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1081 Say Y to include VFP support code in the kernel. This is needed
1082 if your hardware includes a VFP unit.
1084 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1085 release notes and additional status information.
1087 Say N if your target does not have VFP hardware.
1095 bool "Advanced SIMD (NEON) Extension support"
1096 depends on VFPv3 && CPU_V7
1098 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1103 menu "Userspace binary formats"
1105 source "fs/Kconfig.binfmt"
1108 tristate "RISC OS personality"
1111 Say Y here to include the kernel code necessary if you want to run
1112 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1113 experimental; if this sounds frightening, say N and sleep in peace.
1114 You can also say M here to compile this support as a module (which
1115 will be called arthur).
1119 menu "Power management options"
1121 source "kernel/power/Kconfig"
1123 config ARCH_SUSPEND_POSSIBLE
1128 source "net/Kconfig"
1130 menu "Device Drivers"
1132 source "drivers/base/Kconfig"
1134 source "drivers/connector/Kconfig"
1136 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1137 source "drivers/mtd/Kconfig"
1140 source "drivers/parport/Kconfig"
1142 source "drivers/pnp/Kconfig"
1144 source "drivers/block/Kconfig"
1146 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1148 source "drivers/misc/Kconfig"
1150 source "drivers/ide/Kconfig"
1152 source "drivers/scsi/Kconfig"
1154 source "drivers/ata/Kconfig"
1156 source "drivers/md/Kconfig"
1158 source "drivers/message/fusion/Kconfig"
1160 source "drivers/ieee1394/Kconfig"
1162 source "drivers/message/i2o/Kconfig"
1164 source "drivers/net/Kconfig"
1166 source "drivers/isdn/Kconfig"
1168 # input before char - char/joystick depends on it. As does USB.
1170 source "drivers/input/Kconfig"
1172 source "drivers/char/Kconfig"
1174 source "drivers/i2c/Kconfig"
1176 source "drivers/spi/Kconfig"
1178 source "drivers/gpio/Kconfig"
1180 source "drivers/w1/Kconfig"
1182 source "drivers/power/Kconfig"
1184 source "drivers/hwmon/Kconfig"
1186 source "drivers/watchdog/Kconfig"
1188 source "drivers/ssb/Kconfig"
1190 #source "drivers/l3/Kconfig"
1192 source "drivers/mfd/Kconfig"
1194 source "drivers/media/Kconfig"
1196 source "drivers/video/Kconfig"
1198 source "sound/Kconfig"
1200 source "drivers/hid/Kconfig"
1202 source "drivers/usb/Kconfig"
1204 source "drivers/mmc/Kconfig"
1206 source "drivers/leds/Kconfig"
1208 source "drivers/rtc/Kconfig"
1210 source "drivers/dma/Kconfig"
1212 source "drivers/dca/Kconfig"
1214 source "drivers/uio/Kconfig"
1220 source "arch/arm/Kconfig.debug"
1222 source "security/Kconfig"
1224 source "crypto/Kconfig"
1226 source "lib/Kconfig"