2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
14 select SYS_SUPPORTS_APM_EMULATION
17 select HAVE_KPROBES if (!XIP_KERNEL)
18 select HAVE_KRETPROBES if (HAVE_KPROBES)
19 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
20 select HAVE_GENERIC_DMA_COHERENT
22 The ARM series is a line of low-power-consumption RISC chip designs
23 licensed by ARM Ltd and targeted at embedded applications and
24 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
25 manufactured, but legacy ARM-based PC hardware remains popular in
26 Europe. There is an ARM Linux project with a web page at
27 <http://www.arm.linux.org.uk/>.
32 config SYS_SUPPORTS_APM_EMULATION
43 config GENERIC_CLOCKEVENTS
47 config GENERIC_CLOCKEVENTS_BROADCAST
49 depends on GENERIC_CLOCKEVENTS
50 default y if SMP && !LOCAL_TIMERS
63 The Extended Industry Standard Architecture (EISA) bus was
64 developed as an open alternative to the IBM MicroChannel bus.
66 The EISA bus provided some of the features of the IBM MicroChannel
67 bus while maintaining backward compatibility with cards made for
68 the older ISA bus. The EISA bus saw limited use between 1988 and
69 1995 when it was made obsolete by the PCI bus.
71 Say Y here if you are building a kernel for an EISA-based machine.
81 MicroChannel Architecture is found in some IBM PS/2 machines and
82 laptops. It is a bus system similar to PCI or ISA. See
83 <file:Documentation/mca.txt> (and especially the web page given
84 there) before attempting to build an MCA bus kernel.
86 config GENERIC_HARDIRQS
90 config STACKTRACE_SUPPORT
94 config HAVE_LATENCYTOP_SUPPORT
99 config LOCKDEP_SUPPORT
103 config TRACE_IRQFLAGS_SUPPORT
107 config HARDIRQS_SW_RESEND
111 config GENERIC_IRQ_PROBE
115 config GENERIC_LOCKBREAK
118 depends on SMP && PREEMPT
120 config RWSEM_GENERIC_SPINLOCK
124 config RWSEM_XCHGADD_ALGORITHM
127 config ARCH_HAS_ILOG2_U32
131 config ARCH_HAS_ILOG2_U64
135 config GENERIC_HWEIGHT
139 config GENERIC_CALIBRATE_DELAY
143 config ARCH_MAY_HAVE_PC_FDC
149 config GENERIC_ISA_DMA
158 config GENERIC_HARDIRQS_NO__DO_IRQ
164 config OPROFILE_ARMV6
166 depends on CPU_V6 && !SMP
167 select OPROFILE_ARM11_CORE
169 config OPROFILE_MPCORE
171 depends on CPU_V6 && SMP
172 select OPROFILE_ARM11_CORE
174 config OPROFILE_ARM11_CORE
177 config OPROFILE_ARMV7
179 depends on CPU_V7 && !SMP
186 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
187 default DRAM_BASE if REMAP_VECTORS_TO_RAM
190 The base address of exception vectors.
192 source "init/Kconfig"
194 source "kernel/Kconfig.freezer"
199 prompt "ARM system type"
200 default ARCH_VERSATILE
203 bool "Agilent AAEC-2000 based"
208 This enables support for systems based on the Agilent AAEC-2000
210 config ARCH_INTEGRATOR
211 bool "ARM Ltd. Integrator family"
217 Support for ARM's Integrator platform.
220 bool "ARM Ltd. RealView family"
226 select GENERIC_CLOCKEVENTS
228 This enables support for ARM Ltd RealView boards.
230 config ARCH_VERSATILE
231 bool "ARM Ltd. Versatile family"
238 select GENERIC_CLOCKEVENTS
240 This enables support for ARM Ltd Versatile board.
247 This enables support for systems based on the Atmel AT91RM9200,
248 AT91SAM9 and AT91CAP9 processors.
251 bool "Cirrus Logic CLPS711x/EP721x-based"
254 Support for Cirrus Logic 711x/721x based boards.
262 This is an evaluation board for the StrongARM processor available
263 from Digital. It has limited hardware on-board, including an
264 Ethernet interface, two PCMCIA sockets, two serial ports and a
275 select ARCH_REQUIRE_GPIOLIB
277 This enables support for the Cirrus EP93xx series of CPUs.
279 config ARCH_FOOTBRIDGE
284 Support for systems based on the DC21285 companion chip
285 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
288 bool "Hilscher NetX based"
292 This enables support for systems based on the Hilscher NetX Soc
295 bool "Hynix HMS720x-based"
299 This enables support for systems based on the Hynix HMS720x
306 select GENERIC_CLOCKEVENTS
308 Support for Motorola's i.MX family of processors (MX1, MXL).
316 select ARCH_SUPPORTS_MSI
319 Support for Intel's IOP13XX (XScale) family of processors.
328 select ARCH_REQUIRE_GPIOLIB
330 Support for Intel's 80219 and IOP32X (XScale) family of
340 select ARCH_REQUIRE_GPIOLIB
342 Support for Intel's IOP33X (XScale) family of processors.
350 Support for Intel's IXP23xx (XScale) family of processors.
353 bool "IXP2400/2800-based"
358 Support for Intel's IXP2400/2800 (XScale) family of processors.
366 select GENERIC_CLOCKEVENTS
367 select DMABOUNCE if PCI
369 Support for Intel's IXP4XX (XScale) family of processors.
376 Say Y here if you intend to run this kernel on a LinkUp Systems
377 L7200 Software Development Board which uses an ARM720T processor.
378 Information on this board can be obtained at:
380 <http://www.linkupsys.com/>
382 If you have any questions or comments about the Linux kernel port
383 to this board, send e-mail to <sjhill@cotw.com>.
386 bool "Marvell Kirkwood"
391 select GENERIC_CLOCKEVENTS
394 Support for the following Marvell Kirkwood series SoCs:
395 88F6180, 88F6192 and 88F6281.
398 bool "Micrel/Kendin KS8695"
401 select ARCH_REQUIRE_GPIOLIB
403 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
404 System-on-Chip devices.
407 bool "NetSilicon NS9xxx"
411 select GENERIC_CLOCKEVENTS
414 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
417 <http://www.digi.com/products/microprocessors/index.jsp>
420 bool "Marvell Loki (88RC8480)"
423 select GENERIC_CLOCKEVENTS
426 Support for the Marvell Loki (88RC8480) SoC.
429 bool "Marvell MV78xx0"
434 select GENERIC_CLOCKEVENTS
437 Support for the following Marvell MV78xx0 series SoCs:
441 bool "Freescale MXC/iMX-based"
443 select GENERIC_CLOCKEVENTS
446 select ARCH_REQUIRE_GPIOLIB
448 Support for Freescale MXC/iMX-based family of processors
457 select GENERIC_CLOCKEVENTS
460 Support for the following Marvell Orion 5x series SoCs:
461 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
462 Orion-2 (5281), Orion-1-90 (6183).
465 bool "Philips Nexperia PNX4008 Mobile"
469 This enables support for Philips PNX4008 mobile platform.
472 bool "PXA2xx/PXA3xx-based"
478 select ARCH_REQUIRE_GPIOLIB
480 select GENERIC_CLOCKEVENTS
483 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
490 select ARCH_MAY_HAVE_PC_FDC
491 select HAVE_PATA_PLATFORM
494 select ARCH_SPARSEMEM_ENABLE
496 On the Acorn Risc-PC, Linux can support the internal IDE disk and
497 CD-ROM interface, serial and parallel port, and the floppy drive.
503 select ARCH_SPARSEMEM_ENABLE
507 select GENERIC_CLOCKEVENTS
510 select ARCH_REQUIRE_GPIOLIB
512 Support for StrongARM 11x0 based boards.
515 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
519 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
520 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
521 the Samsung SMDK2410 development board (and derivatives).
524 bool "Samsung S3C64XX"
528 Samsung S3C64XX series based systems
538 Support for the StrongARM based Digital DNARD machine, also known
539 as "Shark" (<http://www.shark-linux.de/shark.html>).
544 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
545 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
547 Say Y here for systems based on one of the Sharp LH7A40X
548 System on a Chip processors. These CPUs include an ARM922T
549 core with a wide array of integrated devices for
550 hand-held and low-power applications.
556 select GENERIC_CLOCKEVENTS
558 select ARCH_REQUIRE_GPIOLIB
562 Support for TI's DaVinci platform.
568 select ARCH_REQUIRE_GPIOLIB
570 select GENERIC_CLOCKEVENTS
572 Support for TI's OMAP platform (OMAP1 and OMAP2).
578 select GENERIC_CLOCKEVENTS
580 Support for Qualcomm MSM7K based systems. This runs on the ARM11
581 apps processor of the MSM7K and depends on a shared memory
582 interface to the ARM9 modem processor which runs the baseband stack
583 and controls some vital subsystems (clock and power control, etc).
586 bool "Nuvoton W90X900 CPU"
589 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
590 can login www.mcuos.com or www.nuvoton.com to know more.
594 source "arch/arm/mach-clps711x/Kconfig"
596 source "arch/arm/mach-ep93xx/Kconfig"
598 source "arch/arm/mach-footbridge/Kconfig"
600 source "arch/arm/mach-integrator/Kconfig"
602 source "arch/arm/mach-iop32x/Kconfig"
604 source "arch/arm/mach-iop33x/Kconfig"
606 source "arch/arm/mach-iop13xx/Kconfig"
608 source "arch/arm/mach-ixp4xx/Kconfig"
610 source "arch/arm/mach-ixp2000/Kconfig"
612 source "arch/arm/mach-ixp23xx/Kconfig"
614 source "arch/arm/mach-loki/Kconfig"
616 source "arch/arm/mach-mv78xx0/Kconfig"
618 source "arch/arm/mach-pxa/Kconfig"
620 source "arch/arm/mach-sa1100/Kconfig"
622 source "arch/arm/plat-omap/Kconfig"
624 source "arch/arm/mach-omap1/Kconfig"
626 source "arch/arm/mach-omap2/Kconfig"
628 source "arch/arm/mach-orion5x/Kconfig"
630 source "arch/arm/mach-kirkwood/Kconfig"
632 source "arch/arm/plat-s3c24xx/Kconfig"
633 source "arch/arm/plat-s3c64xx/Kconfig"
634 source "arch/arm/plat-s3c/Kconfig"
637 source "arch/arm/mach-s3c2400/Kconfig"
638 source "arch/arm/mach-s3c2410/Kconfig"
639 source "arch/arm/mach-s3c2412/Kconfig"
640 source "arch/arm/mach-s3c2440/Kconfig"
641 source "arch/arm/mach-s3c2442/Kconfig"
642 source "arch/arm/mach-s3c2443/Kconfig"
646 source "arch/arm/mach-s3c6400/Kconfig"
647 source "arch/arm/mach-s3c6410/Kconfig"
650 source "arch/arm/mach-lh7a40x/Kconfig"
652 source "arch/arm/mach-imx/Kconfig"
654 source "arch/arm/mach-h720x/Kconfig"
656 source "arch/arm/mach-versatile/Kconfig"
658 source "arch/arm/mach-aaec2000/Kconfig"
660 source "arch/arm/mach-realview/Kconfig"
662 source "arch/arm/mach-at91/Kconfig"
664 source "arch/arm/plat-mxc/Kconfig"
666 source "arch/arm/mach-netx/Kconfig"
668 source "arch/arm/mach-ns9xxx/Kconfig"
670 source "arch/arm/mach-davinci/Kconfig"
672 source "arch/arm/mach-ks8695/Kconfig"
674 source "arch/arm/mach-msm/Kconfig"
676 source "arch/arm/mach-w90x900/Kconfig"
678 # Definitions to make life easier
688 source arch/arm/mm/Kconfig
691 bool "Enable iWMMXt support"
692 depends on CPU_XSCALE || CPU_XSC3
693 default y if PXA27x || PXA3xx
695 Enable support for iWMMXt context switching at run time if
696 running on a CPU that supports it.
698 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
701 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
705 source "arch/arm/Kconfig-nommu"
710 source "arch/arm/common/Kconfig"
712 config FORCE_MAX_ZONEORDER
725 Find out whether you have ISA slots on your motherboard. ISA is the
726 name of a bus system, i.e. the way the CPU talks to the other stuff
727 inside your box. Other bus systems are PCI, EISA, MicroChannel
728 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
729 newer boards don't support it. If you have ISA, say Y, otherwise N.
731 # Select ISA DMA controller support
736 # Select ISA DMA interface
741 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
743 Find out whether you have a PCI motherboard. PCI is the name of a
744 bus system, i.e. the way the CPU talks to the other stuff inside
745 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
746 VESA. If you have PCI, say Y, otherwise N.
751 # Select the host bridge type
752 config PCI_HOST_VIA82C505
754 depends on PCI && ARCH_SHARK
757 config PCI_HOST_ITE8152
759 depends on PCI && MACH_ARMCORE
763 source "drivers/pci/Kconfig"
765 source "drivers/pcmcia/Kconfig"
769 menu "Kernel Features"
771 source "kernel/time/Kconfig"
774 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
775 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
776 select USE_GENERIC_SMP_HELPERS
778 This enables support for systems with more than one CPU. If you have
779 a system with only one CPU, like most personal computers, say N. If
780 you have a system with more than one CPU, say Y.
782 If you say N here, the kernel will run on single and multiprocessor
783 machines, but will use only one CPU of a multiprocessor machine. If
784 you say Y here, the kernel will run on many, but not all, single
785 processor machines. On a single processor machine, the kernel will
786 run faster if you say N here.
788 See also <file:Documentation/i386/IO-APIC.txt>,
789 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
790 <http://www.linuxdoc.org/docs.html#howto>.
792 If you don't know what to do here, say N.
795 prompt "Memory split"
798 Select the desired split between kernel and user memory.
800 If you are not absolutely sure what you are doing, leave this
804 bool "3G/1G user/kernel split"
806 bool "2G/2G user/kernel split"
808 bool "1G/3G user/kernel split"
813 default 0x40000000 if VMSPLIT_1G
814 default 0x80000000 if VMSPLIT_2G
818 int "Maximum number of CPUs (2-32)"
824 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
825 depends on SMP && HOTPLUG && EXPERIMENTAL
827 Say Y here to experiment with turning CPUs off and on. CPUs
828 can be controlled through /sys/devices/system/cpu.
831 bool "Use local timer interrupts"
832 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
835 Enable support for local timers on SMP platforms, rather then the
836 legacy IPI broadcast method. Local timers allows the system
837 accounting to be spread across the timer interval, preventing a
838 "thundering herd" at every timer tick.
841 bool "Preemptible Kernel (EXPERIMENTAL)"
842 depends on EXPERIMENTAL
844 This option reduces the latency of the kernel when reacting to
845 real-time or interactive events by allowing a low priority process to
846 be preempted even if it is in kernel mode executing a system call.
847 This allows applications to run more reliably even when the system is
850 Say Y here if you are building a kernel for a desktop, embedded
851 or real-time system. Say N if you are unsure.
855 default 128 if ARCH_L7200
856 default 200 if ARCH_EBSA110 || ARCH_S3C2410
857 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
858 default AT91_TIMER_HZ if ARCH_AT91
862 bool "Use the ARM EABI to compile the kernel"
864 This option allows for the kernel to be compiled using the latest
865 ARM ABI (aka EABI). This is only useful if you are using a user
866 space environment that is also compiled with EABI.
868 Since there are major incompatibilities between the legacy ABI and
869 EABI, especially with regard to structure member alignment, this
870 option also changes the kernel syscall calling convention to
871 disambiguate both ABIs and allow for backward compatibility support
872 (selected with CONFIG_OABI_COMPAT).
874 To use this you need GCC version 4.0.0 or later.
877 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
878 depends on AEABI && EXPERIMENTAL
881 This option preserves the old syscall interface along with the
882 new (ARM EABI) one. It also provides a compatibility layer to
883 intercept syscalls that have structure arguments which layout
884 in memory differs between the legacy ABI and the new ARM EABI
885 (only for non "thumb" binaries). This option adds a tiny
886 overhead to all syscalls and produces a slightly larger kernel.
887 If you know you'll be using only pure EABI user space then you
888 can say N here. If this option is not selected and you attempt
889 to execute a legacy ABI binary then the result will be
890 UNPREDICTABLE (in fact it can be predicted that it won't work
891 at all). If in doubt say Y.
893 config ARCH_FLATMEM_HAS_HOLES
898 # Discontigmem is deprecated
899 config ARCH_DISCONTIGMEM_ENABLE
902 config ARCH_SPARSEMEM_ENABLE
905 config ARCH_SPARSEMEM_DEFAULT
906 def_bool ARCH_SPARSEMEM_ENABLE
908 config ARCH_SELECT_MEMORY_MODEL
909 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
913 default "4" if ARCH_LH7A40X
915 depends on NEED_MULTIPLE_NODES
920 bool "Timer and CPU usage LEDs"
921 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
922 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
923 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
924 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
925 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
926 ARCH_AT91 || ARCH_DAVINCI || \
927 ARCH_KS8695 || MACH_RD88F5182
929 If you say Y here, the LEDs on your machine will be used
930 to provide useful information about your current system status.
932 If you are compiling a kernel for a NetWinder or EBSA-285, you will
933 be able to select which LEDs are active using the options below. If
934 you are compiling a kernel for the EBSA-110 or the LART however, the
935 red LED will simply flash regularly to indicate that the system is
936 still functional. It is safe to say Y here if you have a CATS
937 system, but the driver will do nothing.
940 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
941 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
942 || MACH_OMAP_PERSEUS2
944 depends on !GENERIC_CLOCKEVENTS
945 default y if ARCH_EBSA110
947 If you say Y here, one of the system LEDs (the green one on the
948 NetWinder, the amber one on the EBSA285, or the red one on the LART)
949 will flash regularly to indicate that the system is still
950 operational. This is mainly useful to kernel hackers who are
951 debugging unstable kernels.
953 The LART uses the same LED for both Timer LED and CPU usage LED
954 functions. You may choose to use both, but the Timer LED function
955 will overrule the CPU usage LED.
958 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
960 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
961 || MACH_OMAP_PERSEUS2
964 If you say Y here, the red LED will be used to give a good real
965 time indication of CPU usage, by lighting whenever the idle task
966 is not currently executing.
968 The LART uses the same LED for both Timer LED and CPU usage LED
969 functions. You may choose to use both, but the Timer LED function
970 will overrule the CPU usage LED.
972 config ALIGNMENT_TRAP
974 depends on CPU_CP15_MMU
975 default y if !ARCH_EBSA110
977 ARM processors cannot fetch/store information which is not
978 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
979 address divisible by 4. On 32-bit ARM processors, these non-aligned
980 fetch/store instructions will be emulated in software if you say
981 here, which has a severe performance impact. This is necessary for
982 correct operation of some network protocols. With an IP-only
983 configuration it is safe to say N, otherwise say Y.
989 # Compressed boot loader in ROM. Yes, we really want to ask about
990 # TEXT and BSS so we preserve their values in the config files.
991 config ZBOOT_ROM_TEXT
992 hex "Compressed ROM boot loader base address"
995 The physical address at which the ROM-able zImage is to be
996 placed in the target. Platforms which normally make use of
997 ROM-able zImage formats normally set this to a suitable
998 value in their defconfig file.
1000 If ZBOOT_ROM is not enabled, this has no effect.
1002 config ZBOOT_ROM_BSS
1003 hex "Compressed ROM boot loader BSS address"
1006 The base address of an area of read/write memory in the target
1007 for the ROM-able zImage which must be available while the
1008 decompressor is running. It must be large enough to hold the
1009 entire decompressed kernel plus an additional 128 KiB.
1010 Platforms which normally make use of ROM-able zImage formats
1011 normally set this to a suitable value in their defconfig file.
1013 If ZBOOT_ROM is not enabled, this has no effect.
1016 bool "Compressed boot loader in ROM/flash"
1017 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1019 Say Y here if you intend to execute your compressed kernel image
1020 (zImage) directly from ROM or flash. If unsure, say N.
1023 string "Default kernel command string"
1026 On some architectures (EBSA110 and CATS), there is currently no way
1027 for the boot loader to pass arguments to the kernel. For these
1028 architectures, you should supply some command-line options at build
1029 time by entering them here. As a minimum, you should specify the
1030 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1033 bool "Kernel Execute-In-Place from ROM"
1034 depends on !ZBOOT_ROM
1036 Execute-In-Place allows the kernel to run from non-volatile storage
1037 directly addressable by the CPU, such as NOR flash. This saves RAM
1038 space since the text section of the kernel is not loaded from flash
1039 to RAM. Read-write sections, such as the data section and stack,
1040 are still copied to RAM. The XIP kernel is not compressed since
1041 it has to run directly from flash, so it will take more space to
1042 store it. The flash address used to link the kernel object files,
1043 and for storing it, is configuration dependent. Therefore, if you
1044 say Y here, you must know the proper physical address where to
1045 store the kernel image depending on your own flash memory usage.
1047 Also note that the make target becomes "make xipImage" rather than
1048 "make zImage" or "make Image". The final kernel binary to put in
1049 ROM memory will be arch/arm/boot/xipImage.
1053 config XIP_PHYS_ADDR
1054 hex "XIP Kernel Physical Location"
1055 depends on XIP_KERNEL
1056 default "0x00080000"
1058 This is the physical address in your flash memory the kernel will
1059 be linked for and stored to. This address is dependent on your
1063 bool "Kexec system call (EXPERIMENTAL)"
1064 depends on EXPERIMENTAL
1066 kexec is a system call that implements the ability to shutdown your
1067 current kernel, and to start another kernel. It is like a reboot
1068 but it is independent of the system firmware. And like a reboot
1069 you can start any kernel with it, not just Linux.
1071 It is an ongoing process to be certain the hardware in a machine
1072 is properly shutdown, so do not be surprised if this code does not
1073 initially work for you. It may help to enable device hotplugging
1077 bool "Export atags in procfs"
1081 Should the atags used to boot the kernel be exported in an "atags"
1082 file in procfs. Useful with kexec.
1086 menu "CPU Power Management"
1088 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1090 source "drivers/cpufreq/Kconfig"
1092 config CPU_FREQ_SA1100
1094 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1097 config CPU_FREQ_SA1110
1099 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1102 config CPU_FREQ_INTEGRATOR
1103 tristate "CPUfreq driver for ARM Integrator CPUs"
1104 depends on ARCH_INTEGRATOR && CPU_FREQ
1107 This enables the CPUfreq driver for ARM Integrator CPUs.
1109 For details, take a look at <file:Documentation/cpu-freq>.
1114 tristate "CPUfreq driver for i.MX CPUs"
1115 depends on ARCH_IMX && CPU_FREQ
1118 This enables the CPUfreq driver for i.MX CPUs.
1124 depends on CPU_FREQ && ARCH_PXA && PXA25x
1126 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1130 source "drivers/cpuidle/Kconfig"
1134 menu "Floating point emulation"
1136 comment "At least one emulation must be selected"
1139 bool "NWFPE math emulation"
1140 depends on !AEABI || OABI_COMPAT
1142 Say Y to include the NWFPE floating point emulator in the kernel.
1143 This is necessary to run most binaries. Linux does not currently
1144 support floating point hardware so you need to say Y here even if
1145 your machine has an FPA or floating point co-processor podule.
1147 You may say N here if you are going to load the Acorn FPEmulator
1148 early in the bootup.
1151 bool "Support extended precision"
1152 depends on FPE_NWFPE
1154 Say Y to include 80-bit support in the kernel floating-point
1155 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1156 Note that gcc does not generate 80-bit operations by default,
1157 so in most cases this option only enlarges the size of the
1158 floating point emulator without any good reason.
1160 You almost surely want to say N here.
1163 bool "FastFPE math emulation (EXPERIMENTAL)"
1164 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1166 Say Y here to include the FAST floating point emulator in the kernel.
1167 This is an experimental much faster emulator which now also has full
1168 precision for the mantissa. It does not support any exceptions.
1169 It is very simple, and approximately 3-6 times faster than NWFPE.
1171 It should be sufficient for most programs. It may be not suitable
1172 for scientific calculations, but you have to check this for yourself.
1173 If you do not feel you need a faster FP emulation you should better
1177 bool "VFP-format floating point maths"
1178 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1180 Say Y to include VFP support code in the kernel. This is needed
1181 if your hardware includes a VFP unit.
1183 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1184 release notes and additional status information.
1186 Say N if your target does not have VFP hardware.
1194 bool "Advanced SIMD (NEON) Extension support"
1195 depends on VFPv3 && CPU_V7
1197 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1202 menu "Userspace binary formats"
1204 source "fs/Kconfig.binfmt"
1207 tristate "RISC OS personality"
1210 Say Y here to include the kernel code necessary if you want to run
1211 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1212 experimental; if this sounds frightening, say N and sleep in peace.
1213 You can also say M here to compile this support as a module (which
1214 will be called arthur).
1218 menu "Power management options"
1220 source "kernel/power/Kconfig"
1222 config ARCH_SUSPEND_POSSIBLE
1227 source "net/Kconfig"
1229 menu "Device Drivers"
1231 source "drivers/base/Kconfig"
1233 source "drivers/connector/Kconfig"
1235 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1236 source "drivers/mtd/Kconfig"
1239 source "drivers/parport/Kconfig"
1241 source "drivers/pnp/Kconfig"
1243 source "drivers/block/Kconfig"
1245 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1247 source "drivers/misc/Kconfig"
1249 source "drivers/ide/Kconfig"
1251 source "drivers/scsi/Kconfig"
1253 source "drivers/ata/Kconfig"
1255 source "drivers/md/Kconfig"
1257 source "drivers/message/fusion/Kconfig"
1259 source "drivers/ieee1394/Kconfig"
1261 source "drivers/message/i2o/Kconfig"
1263 source "drivers/net/Kconfig"
1265 source "drivers/isdn/Kconfig"
1267 # input before char - char/joystick depends on it. As does USB.
1269 source "drivers/input/Kconfig"
1271 source "drivers/char/Kconfig"
1273 source "drivers/i2c/Kconfig"
1275 source "drivers/spi/Kconfig"
1277 source "drivers/gpio/Kconfig"
1279 source "drivers/w1/Kconfig"
1281 source "drivers/power/Kconfig"
1283 source "drivers/hwmon/Kconfig"
1285 source "drivers/thermal/Kconfig"
1287 source "drivers/watchdog/Kconfig"
1289 source "drivers/ssb/Kconfig"
1291 #source "drivers/l3/Kconfig"
1293 source "drivers/mfd/Kconfig"
1295 source "drivers/media/Kconfig"
1297 source "drivers/video/Kconfig"
1299 source "sound/Kconfig"
1301 source "drivers/hid/Kconfig"
1303 source "drivers/usb/Kconfig"
1305 source "drivers/uwb/Kconfig"
1307 source "drivers/mmc/Kconfig"
1309 source "drivers/memstick/Kconfig"
1311 source "drivers/accessibility/Kconfig"
1313 source "drivers/leds/Kconfig"
1315 source "drivers/rtc/Kconfig"
1317 source "drivers/dma/Kconfig"
1319 source "drivers/dca/Kconfig"
1321 source "drivers/auxdisplay/Kconfig"
1323 source "drivers/regulator/Kconfig"
1325 source "drivers/uio/Kconfig"
1331 source "arch/arm/Kconfig.debug"
1333 source "security/Kconfig"
1335 source "crypto/Kconfig"
1337 source "lib/Kconfig"