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
163 config OPROFILE_ARMV6
165 depends on CPU_V6 && !SMP
166 select OPROFILE_ARM11_CORE
168 config OPROFILE_MPCORE
170 depends on CPU_V6 && SMP
171 select OPROFILE_ARM11_CORE
173 config OPROFILE_ARM11_CORE
176 config OPROFILE_ARMV7
178 depends on CPU_V7 && !SMP
185 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
186 default DRAM_BASE if REMAP_VECTORS_TO_RAM
189 The base address of exception vectors.
191 source "init/Kconfig"
193 source "kernel/Kconfig.freezer"
198 prompt "ARM system type"
199 default ARCH_VERSATILE
202 bool "Agilent AAEC-2000 based"
207 This enables support for systems based on the Agilent AAEC-2000
209 config ARCH_INTEGRATOR
210 bool "ARM Ltd. Integrator family"
216 Support for ARM's Integrator platform.
219 bool "ARM Ltd. RealView family"
225 select GENERIC_CLOCKEVENTS
227 This enables support for ARM Ltd RealView boards.
229 config ARCH_VERSATILE
230 bool "ARM Ltd. Versatile family"
237 select GENERIC_CLOCKEVENTS
239 This enables support for ARM Ltd Versatile board.
244 select ARCH_REQUIRE_GPIOLIB
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"
291 select GENERIC_CLOCKEVENTS
294 This enables support for systems based on the Hilscher NetX Soc
297 bool "Hynix HMS720x-based"
301 This enables support for systems based on the Hynix HMS720x
308 select GENERIC_CLOCKEVENTS
310 Support for Motorola's i.MX family of processors (MX1, MXL).
318 select ARCH_SUPPORTS_MSI
321 Support for Intel's IOP13XX (XScale) family of processors.
330 select ARCH_REQUIRE_GPIOLIB
332 Support for Intel's 80219 and IOP32X (XScale) family of
342 select ARCH_REQUIRE_GPIOLIB
344 Support for Intel's IOP33X (XScale) family of processors.
352 Support for Intel's IXP23xx (XScale) family of processors.
355 bool "IXP2400/2800-based"
360 Support for Intel's IXP2400/2800 (XScale) family of processors.
368 select GENERIC_CLOCKEVENTS
369 select DMABOUNCE if PCI
371 Support for Intel's IXP4XX (XScale) family of processors.
378 Say Y here if you intend to run this kernel on a LinkUp Systems
379 L7200 Software Development Board which uses an ARM720T processor.
380 Information on this board can be obtained at:
382 <http://www.linkupsys.com/>
384 If you have any questions or comments about the Linux kernel port
385 to this board, send e-mail to <sjhill@cotw.com>.
388 bool "Marvell Kirkwood"
393 select GENERIC_CLOCKEVENTS
396 Support for the following Marvell Kirkwood series SoCs:
397 88F6180, 88F6192 and 88F6281.
400 bool "Micrel/Kendin KS8695"
403 select ARCH_REQUIRE_GPIOLIB
405 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
406 System-on-Chip devices.
409 bool "NetSilicon NS9xxx"
413 select GENERIC_CLOCKEVENTS
416 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
419 <http://www.digi.com/products/microprocessors/index.jsp>
422 bool "Marvell Loki (88RC8480)"
425 select GENERIC_CLOCKEVENTS
428 Support for the Marvell Loki (88RC8480) SoC.
431 bool "Marvell MV78xx0"
436 select GENERIC_CLOCKEVENTS
439 Support for the following Marvell MV78xx0 series SoCs:
443 bool "Freescale MXC/iMX-based"
445 select GENERIC_CLOCKEVENTS
448 select ARCH_REQUIRE_GPIOLIB
450 Support for Freescale MXC/iMX-based family of processors
459 select GENERIC_CLOCKEVENTS
462 Support for the following Marvell Orion 5x series SoCs:
463 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
464 Orion-2 (5281), Orion-1-90 (6183).
467 bool "Philips Nexperia PNX4008 Mobile"
471 This enables support for Philips PNX4008 mobile platform.
474 bool "PXA2xx/PXA3xx-based"
480 select ARCH_REQUIRE_GPIOLIB
482 select GENERIC_CLOCKEVENTS
485 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
492 select ARCH_MAY_HAVE_PC_FDC
493 select HAVE_PATA_PLATFORM
496 select ARCH_SPARSEMEM_ENABLE
498 On the Acorn Risc-PC, Linux can support the internal IDE disk and
499 CD-ROM interface, serial and parallel port, and the floppy drive.
505 select ARCH_SPARSEMEM_ENABLE
509 select GENERIC_CLOCKEVENTS
512 select ARCH_REQUIRE_GPIOLIB
514 Support for StrongARM 11x0 based boards.
517 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
521 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
522 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
523 the Samsung SMDK2410 development board (and derivatives).
526 bool "Samsung S3C64XX"
530 Samsung S3C64XX series based systems
540 Support for the StrongARM based Digital DNARD machine, also known
541 as "Shark" (<http://www.shark-linux.de/shark.html>).
546 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
547 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
549 Say Y here for systems based on one of the Sharp LH7A40X
550 System on a Chip processors. These CPUs include an ARM922T
551 core with a wide array of integrated devices for
552 hand-held and low-power applications.
558 select GENERIC_CLOCKEVENTS
560 select ARCH_REQUIRE_GPIOLIB
564 Support for TI's DaVinci platform.
570 select ARCH_REQUIRE_GPIOLIB
572 select GENERIC_CLOCKEVENTS
574 Support for TI's OMAP platform (OMAP1 and OMAP2).
580 select GENERIC_CLOCKEVENTS
582 Support for Qualcomm MSM7K based systems. This runs on the ARM11
583 apps processor of the MSM7K and depends on a shared memory
584 interface to the ARM9 modem processor which runs the baseband stack
585 and controls some vital subsystems (clock and power control, etc).
588 bool "Nuvoton W90X900 CPU"
591 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
592 can login www.mcuos.com or www.nuvoton.com to know more.
596 source "arch/arm/mach-clps711x/Kconfig"
598 source "arch/arm/mach-ep93xx/Kconfig"
600 source "arch/arm/mach-footbridge/Kconfig"
602 source "arch/arm/mach-integrator/Kconfig"
604 source "arch/arm/mach-iop32x/Kconfig"
606 source "arch/arm/mach-iop33x/Kconfig"
608 source "arch/arm/mach-iop13xx/Kconfig"
610 source "arch/arm/mach-ixp4xx/Kconfig"
612 source "arch/arm/mach-ixp2000/Kconfig"
614 source "arch/arm/mach-ixp23xx/Kconfig"
616 source "arch/arm/mach-loki/Kconfig"
618 source "arch/arm/mach-mv78xx0/Kconfig"
620 source "arch/arm/mach-pxa/Kconfig"
622 source "arch/arm/mach-sa1100/Kconfig"
624 source "arch/arm/plat-omap/Kconfig"
626 source "arch/arm/mach-omap1/Kconfig"
628 source "arch/arm/mach-omap2/Kconfig"
630 source "arch/arm/mach-orion5x/Kconfig"
632 source "arch/arm/mach-kirkwood/Kconfig"
634 source "arch/arm/plat-s3c24xx/Kconfig"
635 source "arch/arm/plat-s3c64xx/Kconfig"
636 source "arch/arm/plat-s3c/Kconfig"
639 source "arch/arm/mach-s3c2400/Kconfig"
640 source "arch/arm/mach-s3c2410/Kconfig"
641 source "arch/arm/mach-s3c2412/Kconfig"
642 source "arch/arm/mach-s3c2440/Kconfig"
643 source "arch/arm/mach-s3c2442/Kconfig"
644 source "arch/arm/mach-s3c2443/Kconfig"
648 source "arch/arm/mach-s3c6400/Kconfig"
649 source "arch/arm/mach-s3c6410/Kconfig"
652 source "arch/arm/mach-lh7a40x/Kconfig"
654 source "arch/arm/mach-imx/Kconfig"
656 source "arch/arm/mach-h720x/Kconfig"
658 source "arch/arm/mach-versatile/Kconfig"
660 source "arch/arm/mach-aaec2000/Kconfig"
662 source "arch/arm/mach-realview/Kconfig"
664 source "arch/arm/mach-at91/Kconfig"
666 source "arch/arm/plat-mxc/Kconfig"
668 source "arch/arm/mach-netx/Kconfig"
670 source "arch/arm/mach-ns9xxx/Kconfig"
672 source "arch/arm/mach-davinci/Kconfig"
674 source "arch/arm/mach-ks8695/Kconfig"
676 source "arch/arm/mach-msm/Kconfig"
678 source "arch/arm/mach-w90x900/Kconfig"
680 # Definitions to make life easier
690 source arch/arm/mm/Kconfig
693 bool "Enable iWMMXt support"
694 depends on CPU_XSCALE || CPU_XSC3
695 default y if PXA27x || PXA3xx
697 Enable support for iWMMXt context switching at run time if
698 running on a CPU that supports it.
700 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
703 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
707 source "arch/arm/Kconfig-nommu"
712 source "arch/arm/common/Kconfig"
714 config FORCE_MAX_ZONEORDER
727 Find out whether you have ISA slots on your motherboard. ISA is the
728 name of a bus system, i.e. the way the CPU talks to the other stuff
729 inside your box. Other bus systems are PCI, EISA, MicroChannel
730 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
731 newer boards don't support it. If you have ISA, say Y, otherwise N.
733 # Select ISA DMA controller support
738 # Select ISA DMA interface
743 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
745 Find out whether you have a PCI motherboard. PCI is the name of a
746 bus system, i.e. the way the CPU talks to the other stuff inside
747 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
748 VESA. If you have PCI, say Y, otherwise N.
753 # Select the host bridge type
754 config PCI_HOST_VIA82C505
756 depends on PCI && ARCH_SHARK
759 config PCI_HOST_ITE8152
761 depends on PCI && MACH_ARMCORE
765 source "drivers/pci/Kconfig"
767 source "drivers/pcmcia/Kconfig"
771 menu "Kernel Features"
773 source "kernel/time/Kconfig"
776 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
777 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
778 select USE_GENERIC_SMP_HELPERS
780 This enables support for systems with more than one CPU. If you have
781 a system with only one CPU, like most personal computers, say N. If
782 you have a system with more than one CPU, say Y.
784 If you say N here, the kernel will run on single and multiprocessor
785 machines, but will use only one CPU of a multiprocessor machine. If
786 you say Y here, the kernel will run on many, but not all, single
787 processor machines. On a single processor machine, the kernel will
788 run faster if you say N here.
790 See also <file:Documentation/i386/IO-APIC.txt>,
791 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
792 <http://www.linuxdoc.org/docs.html#howto>.
794 If you don't know what to do here, say N.
797 prompt "Memory split"
800 Select the desired split between kernel and user memory.
802 If you are not absolutely sure what you are doing, leave this
806 bool "3G/1G user/kernel split"
808 bool "2G/2G user/kernel split"
810 bool "1G/3G user/kernel split"
815 default 0x40000000 if VMSPLIT_1G
816 default 0x80000000 if VMSPLIT_2G
820 int "Maximum number of CPUs (2-32)"
826 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
827 depends on SMP && HOTPLUG && EXPERIMENTAL
829 Say Y here to experiment with turning CPUs off and on. CPUs
830 can be controlled through /sys/devices/system/cpu.
833 bool "Use local timer interrupts"
834 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
837 Enable support for local timers on SMP platforms, rather then the
838 legacy IPI broadcast method. Local timers allows the system
839 accounting to be spread across the timer interval, preventing a
840 "thundering herd" at every timer tick.
843 bool "Preemptible Kernel (EXPERIMENTAL)"
844 depends on EXPERIMENTAL
846 This option reduces the latency of the kernel when reacting to
847 real-time or interactive events by allowing a low priority process to
848 be preempted even if it is in kernel mode executing a system call.
849 This allows applications to run more reliably even when the system is
852 Say Y here if you are building a kernel for a desktop, embedded
853 or real-time system. Say N if you are unsure.
857 default 128 if ARCH_L7200
858 default 200 if ARCH_EBSA110 || ARCH_S3C2410
859 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
860 default AT91_TIMER_HZ if ARCH_AT91
864 bool "Use the ARM EABI to compile the kernel"
866 This option allows for the kernel to be compiled using the latest
867 ARM ABI (aka EABI). This is only useful if you are using a user
868 space environment that is also compiled with EABI.
870 Since there are major incompatibilities between the legacy ABI and
871 EABI, especially with regard to structure member alignment, this
872 option also changes the kernel syscall calling convention to
873 disambiguate both ABIs and allow for backward compatibility support
874 (selected with CONFIG_OABI_COMPAT).
876 To use this you need GCC version 4.0.0 or later.
879 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
880 depends on AEABI && EXPERIMENTAL
883 This option preserves the old syscall interface along with the
884 new (ARM EABI) one. It also provides a compatibility layer to
885 intercept syscalls that have structure arguments which layout
886 in memory differs between the legacy ABI and the new ARM EABI
887 (only for non "thumb" binaries). This option adds a tiny
888 overhead to all syscalls and produces a slightly larger kernel.
889 If you know you'll be using only pure EABI user space then you
890 can say N here. If this option is not selected and you attempt
891 to execute a legacy ABI binary then the result will be
892 UNPREDICTABLE (in fact it can be predicted that it won't work
893 at all). If in doubt say Y.
895 config ARCH_FLATMEM_HAS_HOLES
900 # Discontigmem is deprecated
901 config ARCH_DISCONTIGMEM_ENABLE
904 config ARCH_SPARSEMEM_ENABLE
907 config ARCH_SPARSEMEM_DEFAULT
908 def_bool ARCH_SPARSEMEM_ENABLE
910 config ARCH_SELECT_MEMORY_MODEL
911 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
915 default "4" if ARCH_LH7A40X
917 depends on NEED_MULTIPLE_NODES
922 bool "Timer and CPU usage LEDs"
923 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
924 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
925 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
926 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
927 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
928 ARCH_AT91 || ARCH_DAVINCI || \
929 ARCH_KS8695 || MACH_RD88F5182
931 If you say Y here, the LEDs on your machine will be used
932 to provide useful information about your current system status.
934 If you are compiling a kernel for a NetWinder or EBSA-285, you will
935 be able to select which LEDs are active using the options below. If
936 you are compiling a kernel for the EBSA-110 or the LART however, the
937 red LED will simply flash regularly to indicate that the system is
938 still functional. It is safe to say Y here if you have a CATS
939 system, but the driver will do nothing.
942 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
943 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
944 || MACH_OMAP_PERSEUS2
946 depends on !GENERIC_CLOCKEVENTS
947 default y if ARCH_EBSA110
949 If you say Y here, one of the system LEDs (the green one on the
950 NetWinder, the amber one on the EBSA285, or the red one on the LART)
951 will flash regularly to indicate that the system is still
952 operational. This is mainly useful to kernel hackers who are
953 debugging unstable kernels.
955 The LART uses the same LED for both Timer LED and CPU usage LED
956 functions. You may choose to use both, but the Timer LED function
957 will overrule the CPU usage LED.
960 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
962 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
963 || MACH_OMAP_PERSEUS2
966 If you say Y here, the red LED will be used to give a good real
967 time indication of CPU usage, by lighting whenever the idle task
968 is not currently executing.
970 The LART uses the same LED for both Timer LED and CPU usage LED
971 functions. You may choose to use both, but the Timer LED function
972 will overrule the CPU usage LED.
974 config ALIGNMENT_TRAP
976 depends on CPU_CP15_MMU
977 default y if !ARCH_EBSA110
979 ARM processors cannot fetch/store information which is not
980 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
981 address divisible by 4. On 32-bit ARM processors, these non-aligned
982 fetch/store instructions will be emulated in software if you say
983 here, which has a severe performance impact. This is necessary for
984 correct operation of some network protocols. With an IP-only
985 configuration it is safe to say N, otherwise say Y.
991 # Compressed boot loader in ROM. Yes, we really want to ask about
992 # TEXT and BSS so we preserve their values in the config files.
993 config ZBOOT_ROM_TEXT
994 hex "Compressed ROM boot loader base address"
997 The physical address at which the ROM-able zImage is to be
998 placed in the target. Platforms which normally make use of
999 ROM-able zImage formats normally set this to a suitable
1000 value in their defconfig file.
1002 If ZBOOT_ROM is not enabled, this has no effect.
1004 config ZBOOT_ROM_BSS
1005 hex "Compressed ROM boot loader BSS address"
1008 The base address of an area of read/write memory in the target
1009 for the ROM-able zImage which must be available while the
1010 decompressor is running. It must be large enough to hold the
1011 entire decompressed kernel plus an additional 128 KiB.
1012 Platforms which normally make use of ROM-able zImage formats
1013 normally set this to a suitable value in their defconfig file.
1015 If ZBOOT_ROM is not enabled, this has no effect.
1018 bool "Compressed boot loader in ROM/flash"
1019 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1021 Say Y here if you intend to execute your compressed kernel image
1022 (zImage) directly from ROM or flash. If unsure, say N.
1025 string "Default kernel command string"
1028 On some architectures (EBSA110 and CATS), there is currently no way
1029 for the boot loader to pass arguments to the kernel. For these
1030 architectures, you should supply some command-line options at build
1031 time by entering them here. As a minimum, you should specify the
1032 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1035 bool "Kernel Execute-In-Place from ROM"
1036 depends on !ZBOOT_ROM
1038 Execute-In-Place allows the kernel to run from non-volatile storage
1039 directly addressable by the CPU, such as NOR flash. This saves RAM
1040 space since the text section of the kernel is not loaded from flash
1041 to RAM. Read-write sections, such as the data section and stack,
1042 are still copied to RAM. The XIP kernel is not compressed since
1043 it has to run directly from flash, so it will take more space to
1044 store it. The flash address used to link the kernel object files,
1045 and for storing it, is configuration dependent. Therefore, if you
1046 say Y here, you must know the proper physical address where to
1047 store the kernel image depending on your own flash memory usage.
1049 Also note that the make target becomes "make xipImage" rather than
1050 "make zImage" or "make Image". The final kernel binary to put in
1051 ROM memory will be arch/arm/boot/xipImage.
1055 config XIP_PHYS_ADDR
1056 hex "XIP Kernel Physical Location"
1057 depends on XIP_KERNEL
1058 default "0x00080000"
1060 This is the physical address in your flash memory the kernel will
1061 be linked for and stored to. This address is dependent on your
1065 bool "Kexec system call (EXPERIMENTAL)"
1066 depends on EXPERIMENTAL
1068 kexec is a system call that implements the ability to shutdown your
1069 current kernel, and to start another kernel. It is like a reboot
1070 but it is independent of the system firmware. And like a reboot
1071 you can start any kernel with it, not just Linux.
1073 It is an ongoing process to be certain the hardware in a machine
1074 is properly shutdown, so do not be surprised if this code does not
1075 initially work for you. It may help to enable device hotplugging
1079 bool "Export atags in procfs"
1083 Should the atags used to boot the kernel be exported in an "atags"
1084 file in procfs. Useful with kexec.
1088 menu "CPU Power Management"
1090 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1092 source "drivers/cpufreq/Kconfig"
1094 config CPU_FREQ_SA1100
1096 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1099 config CPU_FREQ_SA1110
1101 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1104 config CPU_FREQ_INTEGRATOR
1105 tristate "CPUfreq driver for ARM Integrator CPUs"
1106 depends on ARCH_INTEGRATOR && CPU_FREQ
1109 This enables the CPUfreq driver for ARM Integrator CPUs.
1111 For details, take a look at <file:Documentation/cpu-freq>.
1116 tristate "CPUfreq driver for i.MX CPUs"
1117 depends on ARCH_IMX && CPU_FREQ
1120 This enables the CPUfreq driver for i.MX CPUs.
1126 depends on CPU_FREQ && ARCH_PXA && PXA25x
1128 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1132 source "drivers/cpuidle/Kconfig"
1136 menu "Floating point emulation"
1138 comment "At least one emulation must be selected"
1141 bool "NWFPE math emulation"
1142 depends on !AEABI || OABI_COMPAT
1144 Say Y to include the NWFPE floating point emulator in the kernel.
1145 This is necessary to run most binaries. Linux does not currently
1146 support floating point hardware so you need to say Y here even if
1147 your machine has an FPA or floating point co-processor podule.
1149 You may say N here if you are going to load the Acorn FPEmulator
1150 early in the bootup.
1153 bool "Support extended precision"
1154 depends on FPE_NWFPE
1156 Say Y to include 80-bit support in the kernel floating-point
1157 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1158 Note that gcc does not generate 80-bit operations by default,
1159 so in most cases this option only enlarges the size of the
1160 floating point emulator without any good reason.
1162 You almost surely want to say N here.
1165 bool "FastFPE math emulation (EXPERIMENTAL)"
1166 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1168 Say Y here to include the FAST floating point emulator in the kernel.
1169 This is an experimental much faster emulator which now also has full
1170 precision for the mantissa. It does not support any exceptions.
1171 It is very simple, and approximately 3-6 times faster than NWFPE.
1173 It should be sufficient for most programs. It may be not suitable
1174 for scientific calculations, but you have to check this for yourself.
1175 If you do not feel you need a faster FP emulation you should better
1179 bool "VFP-format floating point maths"
1180 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1182 Say Y to include VFP support code in the kernel. This is needed
1183 if your hardware includes a VFP unit.
1185 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1186 release notes and additional status information.
1188 Say N if your target does not have VFP hardware.
1196 bool "Advanced SIMD (NEON) Extension support"
1197 depends on VFPv3 && CPU_V7
1199 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1204 menu "Userspace binary formats"
1206 source "fs/Kconfig.binfmt"
1209 tristate "RISC OS personality"
1212 Say Y here to include the kernel code necessary if you want to run
1213 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1214 experimental; if this sounds frightening, say N and sleep in peace.
1215 You can also say M here to compile this support as a module (which
1216 will be called arthur).
1220 menu "Power management options"
1222 source "kernel/power/Kconfig"
1224 config ARCH_SUSPEND_POSSIBLE
1229 source "net/Kconfig"
1231 menu "Device Drivers"
1233 source "drivers/base/Kconfig"
1235 source "drivers/connector/Kconfig"
1237 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1238 source "drivers/mtd/Kconfig"
1241 source "drivers/parport/Kconfig"
1243 source "drivers/pnp/Kconfig"
1245 source "drivers/block/Kconfig"
1247 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1249 source "drivers/misc/Kconfig"
1251 source "drivers/ide/Kconfig"
1253 source "drivers/scsi/Kconfig"
1255 source "drivers/ata/Kconfig"
1257 source "drivers/md/Kconfig"
1259 source "drivers/message/fusion/Kconfig"
1261 source "drivers/ieee1394/Kconfig"
1263 source "drivers/message/i2o/Kconfig"
1265 source "drivers/net/Kconfig"
1267 source "drivers/isdn/Kconfig"
1269 # input before char - char/joystick depends on it. As does USB.
1271 source "drivers/input/Kconfig"
1273 source "drivers/char/Kconfig"
1275 source "drivers/i2c/Kconfig"
1277 source "drivers/spi/Kconfig"
1279 source "drivers/gpio/Kconfig"
1281 source "drivers/w1/Kconfig"
1283 source "drivers/power/Kconfig"
1285 source "drivers/hwmon/Kconfig"
1287 source "drivers/thermal/Kconfig"
1289 source "drivers/watchdog/Kconfig"
1291 source "drivers/ssb/Kconfig"
1293 #source "drivers/l3/Kconfig"
1295 source "drivers/mfd/Kconfig"
1297 source "drivers/media/Kconfig"
1299 source "drivers/video/Kconfig"
1301 source "sound/Kconfig"
1303 source "drivers/hid/Kconfig"
1305 source "drivers/usb/Kconfig"
1307 source "drivers/uwb/Kconfig"
1309 source "drivers/mmc/Kconfig"
1311 source "drivers/memstick/Kconfig"
1313 source "drivers/accessibility/Kconfig"
1315 source "drivers/leds/Kconfig"
1317 source "drivers/rtc/Kconfig"
1319 source "drivers/dma/Kconfig"
1321 source "drivers/dca/Kconfig"
1323 source "drivers/auxdisplay/Kconfig"
1325 source "drivers/regulator/Kconfig"
1327 source "drivers/uio/Kconfig"
1329 source "drivers/staging/Kconfig"
1335 source "arch/arm/Kconfig.debug"
1337 source "security/Kconfig"
1339 source "crypto/Kconfig"
1341 source "lib/Kconfig"