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_FTRACE if (!XIP_KERNEL)
20 select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE)
21 select HAVE_GENERIC_DMA_COHERENT
23 The ARM series is a line of low-power-consumption RISC chip designs
24 licensed by ARM Ltd and targeted at embedded applications and
25 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
26 manufactured, but legacy ARM-based PC hardware remains popular in
27 Europe. There is an ARM Linux project with a web page at
28 <http://www.arm.linux.org.uk/>.
33 config SYS_SUPPORTS_APM_EMULATION
44 config GENERIC_CLOCKEVENTS
48 config GENERIC_CLOCKEVENTS_BROADCAST
50 depends on GENERIC_CLOCKEVENTS
51 default y if SMP && !LOCAL_TIMERS
64 The Extended Industry Standard Architecture (EISA) bus was
65 developed as an open alternative to the IBM MicroChannel bus.
67 The EISA bus provided some of the features of the IBM MicroChannel
68 bus while maintaining backward compatibility with cards made for
69 the older ISA bus. The EISA bus saw limited use between 1988 and
70 1995 when it was made obsolete by the PCI bus.
72 Say Y here if you are building a kernel for an EISA-based machine.
82 MicroChannel Architecture is found in some IBM PS/2 machines and
83 laptops. It is a bus system similar to PCI or ISA. See
84 <file:Documentation/mca.txt> (and especially the web page given
85 there) before attempting to build an MCA bus kernel.
87 config GENERIC_HARDIRQS
91 config STACKTRACE_SUPPORT
95 config HAVE_LATENCYTOP_SUPPORT
100 config LOCKDEP_SUPPORT
104 config TRACE_IRQFLAGS_SUPPORT
108 config HARDIRQS_SW_RESEND
112 config GENERIC_IRQ_PROBE
116 config GENERIC_LOCKBREAK
119 depends on SMP && PREEMPT
121 config RWSEM_GENERIC_SPINLOCK
125 config RWSEM_XCHGADD_ALGORITHM
128 config ARCH_HAS_ILOG2_U32
132 config ARCH_HAS_ILOG2_U64
136 config GENERIC_HWEIGHT
140 config GENERIC_CALIBRATE_DELAY
144 config ARCH_MAY_HAVE_PC_FDC
150 config GENERIC_ISA_DMA
159 config GENERIC_HARDIRQS_NO__DO_IRQ
165 config OPROFILE_ARMV6
167 depends on CPU_V6 && !SMP
168 select OPROFILE_ARM11_CORE
170 config OPROFILE_MPCORE
172 depends on CPU_V6 && SMP
173 select OPROFILE_ARM11_CORE
175 config OPROFILE_ARM11_CORE
178 config OPROFILE_ARMV7
180 depends on CPU_V7 && !SMP
187 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
188 default DRAM_BASE if REMAP_VECTORS_TO_RAM
191 The base address of exception vectors.
193 source "init/Kconfig"
195 source "kernel/Kconfig.freezer"
200 prompt "ARM system type"
201 default ARCH_VERSATILE
204 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"
216 Support for ARM's Integrator platform.
219 bool "ARM Ltd. RealView family"
224 select GENERIC_CLOCKEVENTS
226 This enables support for ARM Ltd RealView boards.
228 config ARCH_VERSATILE
229 bool "ARM Ltd. Versatile family"
235 select GENERIC_CLOCKEVENTS
237 This enables support for ARM Ltd Versatile board.
244 This enables support for systems based on the Atmel AT91RM9200,
245 AT91SAM9 and AT91CAP9 processors.
248 bool "Cirrus CL-PS7500FE"
252 select ARCH_SPARSEMEM_ENABLE
254 Support for the Cirrus Logic PS7500FE system-on-a-chip.
257 bool "Cirrus Logic CLPS711x/EP721x-based"
259 Support for Cirrus Logic 711x/721x based boards.
266 This is an evaluation board for the StrongARM processor available
267 from Digital. It has limited hardware on-board, including an
268 Ethernet interface, two PCMCIA sockets, two serial ports and a
277 select ARCH_REQUIRE_GPIOLIB
279 This enables support for the Cirrus EP93xx series of CPUs.
281 config ARCH_FOOTBRIDGE
285 Support for systems based on the DC21285 companion chip
286 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
289 bool "Hilscher NetX based"
292 This enables support for systems based on the Hilscher NetX Soc
295 bool "Hynix HMS720x-based"
298 This enables support for systems based on the Hynix HMS720x
304 select GENERIC_CLOCKEVENTS
306 Support for Motorola's i.MX family of processors (MX1, MXL).
313 select ARCH_SUPPORTS_MSI
316 Support for Intel's IOP13XX (XScale) family of processors.
324 select ARCH_REQUIRE_GPIOLIB
326 Support for Intel's 80219 and IOP32X (XScale) family of
335 select ARCH_REQUIRE_GPIOLIB
337 Support for Intel's IOP33X (XScale) family of processors.
344 Support for Intel's IXP23xx (XScale) family of processors.
347 bool "IXP2400/2800-based"
351 Support for Intel's IXP2400/2800 (XScale) family of processors.
358 select GENERIC_CLOCKEVENTS
359 select ZONE_DMA if PCI
361 Support for Intel's IXP4XX (XScale) family of processors.
367 Say Y here if you intend to run this kernel on a LinkUp Systems
368 L7200 Software Development Board which uses an ARM720T processor.
369 Information on this board can be obtained at:
371 <http://www.linkupsys.com/>
373 If you have any questions or comments about the Linux kernel port
374 to this board, send e-mail to <sjhill@cotw.com>.
377 bool "Marvell Kirkwood"
380 select GENERIC_CLOCKEVENTS
383 Support for the following Marvell Kirkwood series SoCs:
384 88F6180, 88F6192 and 88F6281.
387 bool "Micrel/Kendin KS8695"
390 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
391 System-on-Chip devices.
394 bool "NetSilicon NS9xxx"
397 select GENERIC_CLOCKEVENTS
400 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
403 <http://www.digi.com/products/microprocessors/index.jsp>
406 bool "Marvell Loki (88RC8480)"
408 select GENERIC_CLOCKEVENTS
411 Support for the Marvell Loki (88RC8480) SoC.
414 bool "Marvell MV78xx0"
417 select GENERIC_CLOCKEVENTS
420 Support for the following Marvell MV78xx0 series SoCs:
424 bool "Freescale MXC/iMX-based"
426 select GENERIC_CLOCKEVENTS
429 select ARCH_REQUIRE_GPIOLIB
431 Support for Freescale MXC/iMX-based family of processors
439 select GENERIC_CLOCKEVENTS
442 Support for the following Marvell Orion 5x series SoCs:
443 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
444 Orion-2 (5281), Orion-1-90 (6183).
447 bool "Philips Nexperia PNX4008 Mobile"
450 This enables support for Philips PNX4008 mobile platform.
453 bool "PXA2xx/PXA3xx-based"
458 select ARCH_REQUIRE_GPIOLIB
460 select GENERIC_CLOCKEVENTS
463 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
470 select ARCH_MAY_HAVE_PC_FDC
471 select HAVE_PATA_PLATFORM
474 select ARCH_SPARSEMEM_ENABLE
476 On the Acorn Risc-PC, Linux can support the internal IDE disk and
477 CD-ROM interface, serial and parallel port, and the floppy drive.
482 select ARCH_SPARSEMEM_ENABLE
486 select GENERIC_CLOCKEVENTS
489 select ARCH_REQUIRE_GPIOLIB
491 Support for StrongARM 11x0 based boards.
494 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
498 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
499 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
500 the Samsung SMDK2410 development board (and derivatives).
509 Support for the StrongARM based Digital DNARD machine, also known
510 as "Shark" (<http://www.shark-linux.de/shark.html>).
514 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
515 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
517 Say Y here for systems based on one of the Sharp LH7A40X
518 System on a Chip processors. These CPUs include an ARM922T
519 core with a wide array of integrated devices for
520 hand-held and low-power applications.
525 select GENERIC_CLOCKEVENTS
527 select ARCH_REQUIRE_GPIOLIB
531 Support for TI's DaVinci platform.
537 select ARCH_REQUIRE_GPIOLIB
539 select GENERIC_CLOCKEVENTS
541 Support for TI's OMAP platform (OMAP1 and OMAP2).
544 bool "Qualcomm MSM7X00A"
546 select GENERIC_CLOCKEVENTS
548 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
549 apps processor of the MSM7X00A and depends on a shared memory
550 interface to the ARM9 modem processor which runs the baseband stack
551 and controls some vital subsystems (clock and power control, etc).
552 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
556 source "arch/arm/mach-clps711x/Kconfig"
558 source "arch/arm/mach-ep93xx/Kconfig"
560 source "arch/arm/mach-footbridge/Kconfig"
562 source "arch/arm/mach-integrator/Kconfig"
564 source "arch/arm/mach-iop32x/Kconfig"
566 source "arch/arm/mach-iop33x/Kconfig"
568 source "arch/arm/mach-iop13xx/Kconfig"
570 source "arch/arm/mach-ixp4xx/Kconfig"
572 source "arch/arm/mach-ixp2000/Kconfig"
574 source "arch/arm/mach-ixp23xx/Kconfig"
576 source "arch/arm/mach-loki/Kconfig"
578 source "arch/arm/mach-mv78xx0/Kconfig"
580 source "arch/arm/mach-pxa/Kconfig"
582 source "arch/arm/mach-sa1100/Kconfig"
584 source "arch/arm/plat-omap/Kconfig"
586 source "arch/arm/mach-omap1/Kconfig"
588 source "arch/arm/mach-omap2/Kconfig"
590 source "arch/arm/mach-orion5x/Kconfig"
592 source "arch/arm/mach-kirkwood/Kconfig"
594 source "arch/arm/plat-s3c24xx/Kconfig"
595 source "arch/arm/plat-s3c/Kconfig"
598 source "arch/arm/mach-s3c2400/Kconfig"
599 source "arch/arm/mach-s3c2410/Kconfig"
600 source "arch/arm/mach-s3c2412/Kconfig"
601 source "arch/arm/mach-s3c2440/Kconfig"
602 source "arch/arm/mach-s3c2442/Kconfig"
603 source "arch/arm/mach-s3c2443/Kconfig"
606 source "arch/arm/mach-lh7a40x/Kconfig"
608 source "arch/arm/mach-imx/Kconfig"
610 source "arch/arm/mach-h720x/Kconfig"
612 source "arch/arm/mach-versatile/Kconfig"
614 source "arch/arm/mach-aaec2000/Kconfig"
616 source "arch/arm/mach-realview/Kconfig"
618 source "arch/arm/mach-at91/Kconfig"
620 source "arch/arm/plat-mxc/Kconfig"
622 source "arch/arm/mach-netx/Kconfig"
624 source "arch/arm/mach-ns9xxx/Kconfig"
626 source "arch/arm/mach-davinci/Kconfig"
628 source "arch/arm/mach-ks8695/Kconfig"
630 source "arch/arm/mach-msm/Kconfig"
632 # Definitions to make life easier
642 source arch/arm/mm/Kconfig
645 bool "Enable iWMMXt support"
646 depends on CPU_XSCALE || CPU_XSC3
647 default y if PXA27x || PXA3xx
649 Enable support for iWMMXt context switching at run time if
650 running on a CPU that supports it.
652 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
655 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
659 source "arch/arm/Kconfig-nommu"
664 source "arch/arm/common/Kconfig"
666 config FORCE_MAX_ZONEORDER
679 Find out whether you have ISA slots on your motherboard. ISA is the
680 name of a bus system, i.e. the way the CPU talks to the other stuff
681 inside your box. Other bus systems are PCI, EISA, MicroChannel
682 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
683 newer boards don't support it. If you have ISA, say Y, otherwise N.
685 # Select ISA DMA controller support
690 # Select ISA DMA interface
695 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
697 Find out whether you have a PCI motherboard. PCI is the name of a
698 bus system, i.e. the way the CPU talks to the other stuff inside
699 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
700 VESA. If you have PCI, say Y, otherwise N.
705 # Select the host bridge type
706 config PCI_HOST_VIA82C505
708 depends on PCI && ARCH_SHARK
711 config PCI_HOST_ITE8152
713 depends on PCI && MACH_ARMCORE
717 source "drivers/pci/Kconfig"
719 source "drivers/pcmcia/Kconfig"
723 menu "Kernel Features"
725 source "kernel/time/Kconfig"
728 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
729 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
730 select USE_GENERIC_SMP_HELPERS
732 This enables support for systems with more than one CPU. If you have
733 a system with only one CPU, like most personal computers, say N. If
734 you have a system with more than one CPU, say Y.
736 If you say N here, the kernel will run on single and multiprocessor
737 machines, but will use only one CPU of a multiprocessor machine. If
738 you say Y here, the kernel will run on many, but not all, single
739 processor machines. On a single processor machine, the kernel will
740 run faster if you say N here.
742 See also <file:Documentation/i386/IO-APIC.txt>,
743 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
744 <http://www.linuxdoc.org/docs.html#howto>.
746 If you don't know what to do here, say N.
749 prompt "Memory split"
752 Select the desired split between kernel and user memory.
754 If you are not absolutely sure what you are doing, leave this
758 bool "3G/1G user/kernel split"
760 bool "2G/2G user/kernel split"
762 bool "1G/3G user/kernel split"
767 default 0x40000000 if VMSPLIT_1G
768 default 0x80000000 if VMSPLIT_2G
772 int "Maximum number of CPUs (2-32)"
778 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
779 depends on SMP && HOTPLUG && EXPERIMENTAL
781 Say Y here to experiment with turning CPUs off and on. CPUs
782 can be controlled through /sys/devices/system/cpu.
785 bool "Use local timer interrupts"
786 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
789 Enable support for local timers on SMP platforms, rather then the
790 legacy IPI broadcast method. Local timers allows the system
791 accounting to be spread across the timer interval, preventing a
792 "thundering herd" at every timer tick.
795 bool "Preemptible Kernel (EXPERIMENTAL)"
796 depends on EXPERIMENTAL
798 This option reduces the latency of the kernel when reacting to
799 real-time or interactive events by allowing a low priority process to
800 be preempted even if it is in kernel mode executing a system call.
801 This allows applications to run more reliably even when the system is
804 Say Y here if you are building a kernel for a desktop, embedded
805 or real-time system. Say N if you are unsure.
809 default 128 if ARCH_L7200
810 default 200 if ARCH_EBSA110 || ARCH_S3C2410
811 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
812 default AT91_TIMER_HZ if ARCH_AT91
816 bool "Use the ARM EABI to compile the kernel"
818 This option allows for the kernel to be compiled using the latest
819 ARM ABI (aka EABI). This is only useful if you are using a user
820 space environment that is also compiled with EABI.
822 Since there are major incompatibilities between the legacy ABI and
823 EABI, especially with regard to structure member alignment, this
824 option also changes the kernel syscall calling convention to
825 disambiguate both ABIs and allow for backward compatibility support
826 (selected with CONFIG_OABI_COMPAT).
828 To use this you need GCC version 4.0.0 or later.
831 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
832 depends on AEABI && EXPERIMENTAL
835 This option preserves the old syscall interface along with the
836 new (ARM EABI) one. It also provides a compatibility layer to
837 intercept syscalls that have structure arguments which layout
838 in memory differs between the legacy ABI and the new ARM EABI
839 (only for non "thumb" binaries). This option adds a tiny
840 overhead to all syscalls and produces a slightly larger kernel.
841 If you know you'll be using only pure EABI user space then you
842 can say N here. If this option is not selected and you attempt
843 to execute a legacy ABI binary then the result will be
844 UNPREDICTABLE (in fact it can be predicted that it won't work
845 at all). If in doubt say Y.
847 config ARCH_FLATMEM_HAS_HOLES
852 # Discontigmem is deprecated
853 config ARCH_DISCONTIGMEM_ENABLE
856 config ARCH_SPARSEMEM_ENABLE
859 config ARCH_SPARSEMEM_DEFAULT
860 def_bool ARCH_SPARSEMEM_ENABLE
862 config ARCH_SELECT_MEMORY_MODEL
863 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
867 default "4" if ARCH_LH7A40X
869 depends on NEED_MULTIPLE_NODES
874 bool "Timer and CPU usage LEDs"
875 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
876 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
877 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
878 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
879 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
880 ARCH_AT91 || ARCH_DAVINCI || \
881 ARCH_KS8695 || MACH_RD88F5182
883 If you say Y here, the LEDs on your machine will be used
884 to provide useful information about your current system status.
886 If you are compiling a kernel for a NetWinder or EBSA-285, you will
887 be able to select which LEDs are active using the options below. If
888 you are compiling a kernel for the EBSA-110 or the LART however, the
889 red LED will simply flash regularly to indicate that the system is
890 still functional. It is safe to say Y here if you have a CATS
891 system, but the driver will do nothing.
894 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
895 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
896 || MACH_OMAP_PERSEUS2
898 depends on !GENERIC_CLOCKEVENTS
899 default y if ARCH_EBSA110
901 If you say Y here, one of the system LEDs (the green one on the
902 NetWinder, the amber one on the EBSA285, or the red one on the LART)
903 will flash regularly to indicate that the system is still
904 operational. This is mainly useful to kernel hackers who are
905 debugging unstable kernels.
907 The LART uses the same LED for both Timer LED and CPU usage LED
908 functions. You may choose to use both, but the Timer LED function
909 will overrule the CPU usage LED.
912 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
914 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
915 || MACH_OMAP_PERSEUS2
918 If you say Y here, the red LED will be used to give a good real
919 time indication of CPU usage, by lighting whenever the idle task
920 is not currently executing.
922 The LART uses the same LED for both Timer LED and CPU usage LED
923 functions. You may choose to use both, but the Timer LED function
924 will overrule the CPU usage LED.
926 config ALIGNMENT_TRAP
928 depends on CPU_CP15_MMU
929 default y if !ARCH_EBSA110
931 ARM processors cannot fetch/store information which is not
932 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
933 address divisible by 4. On 32-bit ARM processors, these non-aligned
934 fetch/store instructions will be emulated in software if you say
935 here, which has a severe performance impact. This is necessary for
936 correct operation of some network protocols. With an IP-only
937 configuration it is safe to say N, otherwise say Y.
943 # Compressed boot loader in ROM. Yes, we really want to ask about
944 # TEXT and BSS so we preserve their values in the config files.
945 config ZBOOT_ROM_TEXT
946 hex "Compressed ROM boot loader base address"
949 The physical address at which the ROM-able zImage is to be
950 placed in the target. Platforms which normally make use of
951 ROM-able zImage formats normally set this to a suitable
952 value in their defconfig file.
954 If ZBOOT_ROM is not enabled, this has no effect.
957 hex "Compressed ROM boot loader BSS address"
960 The base address of an area of read/write memory in the target
961 for the ROM-able zImage which must be available while the
962 decompressor is running. It must be large enough to hold the
963 entire decompressed kernel plus an additional 128 KiB.
964 Platforms which normally make use of ROM-able zImage formats
965 normally set this to a suitable value in their defconfig file.
967 If ZBOOT_ROM is not enabled, this has no effect.
970 bool "Compressed boot loader in ROM/flash"
971 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
973 Say Y here if you intend to execute your compressed kernel image
974 (zImage) directly from ROM or flash. If unsure, say N.
977 string "Default kernel command string"
980 On some architectures (EBSA110 and CATS), there is currently no way
981 for the boot loader to pass arguments to the kernel. For these
982 architectures, you should supply some command-line options at build
983 time by entering them here. As a minimum, you should specify the
984 memory size and the root device (e.g., mem=64M root=/dev/nfs).
987 bool "Kernel Execute-In-Place from ROM"
988 depends on !ZBOOT_ROM
990 Execute-In-Place allows the kernel to run from non-volatile storage
991 directly addressable by the CPU, such as NOR flash. This saves RAM
992 space since the text section of the kernel is not loaded from flash
993 to RAM. Read-write sections, such as the data section and stack,
994 are still copied to RAM. The XIP kernel is not compressed since
995 it has to run directly from flash, so it will take more space to
996 store it. The flash address used to link the kernel object files,
997 and for storing it, is configuration dependent. Therefore, if you
998 say Y here, you must know the proper physical address where to
999 store the kernel image depending on your own flash memory usage.
1001 Also note that the make target becomes "make xipImage" rather than
1002 "make zImage" or "make Image". The final kernel binary to put in
1003 ROM memory will be arch/arm/boot/xipImage.
1007 config XIP_PHYS_ADDR
1008 hex "XIP Kernel Physical Location"
1009 depends on XIP_KERNEL
1010 default "0x00080000"
1012 This is the physical address in your flash memory the kernel will
1013 be linked for and stored to. This address is dependent on your
1017 bool "Kexec system call (EXPERIMENTAL)"
1018 depends on EXPERIMENTAL
1020 kexec is a system call that implements the ability to shutdown your
1021 current kernel, and to start another kernel. It is like a reboot
1022 but it is independent of the system firmware. And like a reboot
1023 you can start any kernel with it, not just Linux.
1025 It is an ongoing process to be certain the hardware in a machine
1026 is properly shutdown, so do not be surprised if this code does not
1027 initially work for you. It may help to enable device hotplugging
1031 bool "Export atags in procfs"
1035 Should the atags used to boot the kernel be exported in an "atags"
1036 file in procfs. Useful with kexec.
1040 menu "CPU Power Management"
1042 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1044 source "drivers/cpufreq/Kconfig"
1046 config CPU_FREQ_SA1100
1048 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1051 config CPU_FREQ_SA1110
1053 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1056 config CPU_FREQ_INTEGRATOR
1057 tristate "CPUfreq driver for ARM Integrator CPUs"
1058 depends on ARCH_INTEGRATOR && CPU_FREQ
1061 This enables the CPUfreq driver for ARM Integrator CPUs.
1063 For details, take a look at <file:Documentation/cpu-freq>.
1068 tristate "CPUfreq driver for i.MX CPUs"
1069 depends on ARCH_IMX && CPU_FREQ
1072 This enables the CPUfreq driver for i.MX CPUs.
1078 depends on CPU_FREQ && ARCH_PXA && PXA25x
1080 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1084 source "drivers/cpuidle/Kconfig"
1088 menu "Floating point emulation"
1090 comment "At least one emulation must be selected"
1093 bool "NWFPE math emulation"
1094 depends on !AEABI || OABI_COMPAT
1096 Say Y to include the NWFPE floating point emulator in the kernel.
1097 This is necessary to run most binaries. Linux does not currently
1098 support floating point hardware so you need to say Y here even if
1099 your machine has an FPA or floating point co-processor podule.
1101 You may say N here if you are going to load the Acorn FPEmulator
1102 early in the bootup.
1105 bool "Support extended precision"
1106 depends on FPE_NWFPE
1108 Say Y to include 80-bit support in the kernel floating-point
1109 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1110 Note that gcc does not generate 80-bit operations by default,
1111 so in most cases this option only enlarges the size of the
1112 floating point emulator without any good reason.
1114 You almost surely want to say N here.
1117 bool "FastFPE math emulation (EXPERIMENTAL)"
1118 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1120 Say Y here to include the FAST floating point emulator in the kernel.
1121 This is an experimental much faster emulator which now also has full
1122 precision for the mantissa. It does not support any exceptions.
1123 It is very simple, and approximately 3-6 times faster than NWFPE.
1125 It should be sufficient for most programs. It may be not suitable
1126 for scientific calculations, but you have to check this for yourself.
1127 If you do not feel you need a faster FP emulation you should better
1131 bool "VFP-format floating point maths"
1132 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1134 Say Y to include VFP support code in the kernel. This is needed
1135 if your hardware includes a VFP unit.
1137 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1138 release notes and additional status information.
1140 Say N if your target does not have VFP hardware.
1148 bool "Advanced SIMD (NEON) Extension support"
1149 depends on VFPv3 && CPU_V7
1151 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1156 menu "Userspace binary formats"
1158 source "fs/Kconfig.binfmt"
1161 tristate "RISC OS personality"
1164 Say Y here to include the kernel code necessary if you want to run
1165 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1166 experimental; if this sounds frightening, say N and sleep in peace.
1167 You can also say M here to compile this support as a module (which
1168 will be called arthur).
1172 menu "Power management options"
1174 source "kernel/power/Kconfig"
1176 config ARCH_SUSPEND_POSSIBLE
1181 source "net/Kconfig"
1183 menu "Device Drivers"
1185 source "drivers/base/Kconfig"
1187 source "drivers/connector/Kconfig"
1189 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1190 source "drivers/mtd/Kconfig"
1193 source "drivers/parport/Kconfig"
1195 source "drivers/pnp/Kconfig"
1197 source "drivers/block/Kconfig"
1199 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1201 source "drivers/misc/Kconfig"
1203 source "drivers/ide/Kconfig"
1205 source "drivers/scsi/Kconfig"
1207 source "drivers/ata/Kconfig"
1209 source "drivers/md/Kconfig"
1211 source "drivers/message/fusion/Kconfig"
1213 source "drivers/ieee1394/Kconfig"
1215 source "drivers/message/i2o/Kconfig"
1217 source "drivers/net/Kconfig"
1219 source "drivers/isdn/Kconfig"
1221 # input before char - char/joystick depends on it. As does USB.
1223 source "drivers/input/Kconfig"
1225 source "drivers/char/Kconfig"
1227 source "drivers/i2c/Kconfig"
1229 source "drivers/spi/Kconfig"
1231 source "drivers/gpio/Kconfig"
1233 source "drivers/w1/Kconfig"
1235 source "drivers/power/Kconfig"
1237 source "drivers/hwmon/Kconfig"
1239 source "drivers/thermal/Kconfig"
1241 source "drivers/watchdog/Kconfig"
1243 source "drivers/ssb/Kconfig"
1245 #source "drivers/l3/Kconfig"
1247 source "drivers/mfd/Kconfig"
1249 source "drivers/media/Kconfig"
1251 source "drivers/video/Kconfig"
1253 source "sound/Kconfig"
1255 source "drivers/hid/Kconfig"
1257 source "drivers/usb/Kconfig"
1259 source "drivers/mmc/Kconfig"
1261 source "drivers/memstick/Kconfig"
1263 source "drivers/accessibility/Kconfig"
1265 source "drivers/leds/Kconfig"
1267 source "drivers/rtc/Kconfig"
1269 source "drivers/dma/Kconfig"
1271 source "drivers/dca/Kconfig"
1273 source "drivers/auxdisplay/Kconfig"
1275 source "drivers/regulator/Kconfig"
1277 source "drivers/uio/Kconfig"
1283 source "arch/arm/Kconfig.debug"
1285 source "security/Kconfig"
1287 source "crypto/Kconfig"
1289 source "lib/Kconfig"