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
41 config GENERIC_CLOCKEVENTS
44 config GENERIC_CLOCKEVENTS_BROADCAST
46 depends on GENERIC_CLOCKEVENTS
47 default y if SMP && !LOCAL_TIMERS
59 The Extended Industry Standard Architecture (EISA) bus was
60 developed as an open alternative to the IBM MicroChannel bus.
62 The EISA bus provided some of the features of the IBM MicroChannel
63 bus while maintaining backward compatibility with cards made for
64 the older ISA bus. The EISA bus saw limited use between 1988 and
65 1995 when it was made obsolete by the PCI bus.
67 Say Y here if you are building a kernel for an EISA-based machine.
77 MicroChannel Architecture is found in some IBM PS/2 machines and
78 laptops. It is a bus system similar to PCI or ISA. See
79 <file:Documentation/mca.txt> (and especially the web page given
80 there) before attempting to build an MCA bus kernel.
82 config GENERIC_HARDIRQS
86 config STACKTRACE_SUPPORT
90 config HAVE_LATENCYTOP_SUPPORT
95 config LOCKDEP_SUPPORT
99 config TRACE_IRQFLAGS_SUPPORT
103 config HARDIRQS_SW_RESEND
107 config GENERIC_IRQ_PROBE
111 config GENERIC_LOCKBREAK
114 depends on SMP && PREEMPT
116 config RWSEM_GENERIC_SPINLOCK
120 config RWSEM_XCHGADD_ALGORITHM
123 config ARCH_HAS_ILOG2_U32
126 config ARCH_HAS_ILOG2_U64
129 config GENERIC_HWEIGHT
133 config GENERIC_CALIBRATE_DELAY
137 config ARCH_MAY_HAVE_PC_FDC
143 config GENERIC_ISA_DMA
152 config GENERIC_HARDIRQS_NO__DO_IRQ
157 config OPROFILE_ARMV6
159 depends on CPU_V6 && !SMP
160 select OPROFILE_ARM11_CORE
162 config OPROFILE_MPCORE
164 depends on CPU_V6 && SMP
165 select OPROFILE_ARM11_CORE
167 config OPROFILE_ARM11_CORE
170 config OPROFILE_ARMV7
172 depends on CPU_V7 && !SMP
179 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
180 default DRAM_BASE if REMAP_VECTORS_TO_RAM
183 The base address of exception vectors.
185 source "init/Kconfig"
187 source "kernel/Kconfig.freezer"
192 prompt "ARM system type"
193 default ARCH_VERSATILE
196 bool "Agilent AAEC-2000 based"
201 This enables support for systems based on the Agilent AAEC-2000
203 config ARCH_INTEGRATOR
204 bool "ARM Ltd. Integrator family"
210 Support for ARM's Integrator platform.
213 bool "ARM Ltd. RealView family"
219 select GENERIC_CLOCKEVENTS
221 This enables support for ARM Ltd RealView boards.
223 config ARCH_VERSATILE
224 bool "ARM Ltd. Versatile family"
231 select GENERIC_CLOCKEVENTS
233 This enables support for ARM Ltd Versatile board.
238 select ARCH_REQUIRE_GPIOLIB
241 This enables support for systems based on the Atmel AT91RM9200,
242 AT91SAM9 and AT91CAP9 processors.
245 bool "Cirrus Logic CLPS711x/EP721x-based"
248 Support for Cirrus Logic 711x/721x based boards.
251 bool "Cortina Systems Gemini"
254 select ARCH_REQUIRE_GPIOLIB
256 Support for the Cortina Systems Gemini family SoCs
264 This is an evaluation board for the StrongARM processor available
265 from Digital. It has limited hardware on-board, including an
266 Ethernet interface, two PCMCIA sockets, two serial ports and a
277 select ARCH_REQUIRE_GPIOLIB
278 select ARCH_HAS_HOLES_MEMORYMODEL
280 This enables support for the Cirrus EP93xx series of CPUs.
282 config ARCH_FOOTBRIDGE
287 Support for systems based on the DC21285 companion chip
288 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
291 bool "Freescale MXC/iMX-based"
293 select GENERIC_CLOCKEVENTS
296 select ARCH_REQUIRE_GPIOLIB
299 Support for Freescale MXC/iMX-based family of processors
302 bool "Freescale STMP3xxx"
306 select ARCH_REQUIRE_GPIOLIB
308 select GENERIC_CLOCKEVENTS
310 select USB_ARCH_HAS_EHCI
312 Support for systems based on the Freescale 3xxx CPUs.
315 bool "Hilscher NetX based"
318 select GENERIC_CLOCKEVENTS
321 This enables support for systems based on the Hilscher NetX Soc
324 bool "Hynix HMS720x-based"
328 This enables support for systems based on the Hynix HMS720x
331 bool "STMicroelectronics Nomadik"
338 select GENERIC_CLOCKEVENTS
341 Support for the Nomadik platform by ST-Ericsson
349 select ARCH_SUPPORTS_MSI
352 Support for Intel's IOP13XX (XScale) family of processors.
361 select ARCH_REQUIRE_GPIOLIB
363 Support for Intel's 80219 and IOP32X (XScale) family of
373 select ARCH_REQUIRE_GPIOLIB
375 Support for Intel's IOP33X (XScale) family of processors.
383 Support for Intel's IXP23xx (XScale) family of processors.
386 bool "IXP2400/2800-based"
391 Support for Intel's IXP2400/2800 (XScale) family of processors.
399 select GENERIC_CLOCKEVENTS
400 select DMABOUNCE if PCI
402 Support for Intel's IXP4XX (XScale) family of processors.
409 Say Y here if you intend to run this kernel on a LinkUp Systems
410 L7200 Software Development Board which uses an ARM720T processor.
411 Information on this board can be obtained at:
413 <http://www.linkupsys.com/>
415 If you have any questions or comments about the Linux kernel port
416 to this board, send e-mail to <sjhill@cotw.com>.
419 bool "Marvell Kirkwood"
423 select ARCH_REQUIRE_GPIOLIB
425 select GENERIC_CLOCKEVENTS
428 Support for the following Marvell Kirkwood series SoCs:
429 88F6180, 88F6192 and 88F6281.
432 bool "Marvell Loki (88RC8480)"
435 select GENERIC_CLOCKEVENTS
438 Support for the Marvell Loki (88RC8480) SoC.
441 bool "Marvell MV78xx0"
445 select ARCH_REQUIRE_GPIOLIB
447 select GENERIC_CLOCKEVENTS
450 Support for the following Marvell MV78xx0 series SoCs:
459 select ARCH_REQUIRE_GPIOLIB
461 select GENERIC_CLOCKEVENTS
464 Support for the following Marvell Orion 5x series SoCs:
465 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
466 Orion-2 (5281), Orion-1-90 (6183).
469 bool "Marvell PXA168/910"
472 select ARCH_REQUIRE_GPIOLIB
476 select GENERIC_CLOCKEVENTS
480 Support for Marvell's PXA168/910 processor line.
483 bool "Micrel/Kendin KS8695"
486 select ARCH_REQUIRE_GPIOLIB
488 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
489 System-on-Chip devices.
492 bool "NetSilicon NS9xxx"
496 select GENERIC_CLOCKEVENTS
499 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
502 <http://www.digi.com/products/microprocessors/index.jsp>
505 bool "Nuvoton W90X900 CPU"
507 select ARCH_REQUIRE_GPIOLIB
511 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
512 can login www.mcuos.com or www.nuvoton.com to know more.
515 bool "Philips Nexperia PNX4008 Mobile"
519 This enables support for Philips PNX4008 mobile platform.
522 bool "PXA2xx/PXA3xx-based"
528 select ARCH_REQUIRE_GPIOLIB
530 select GENERIC_CLOCKEVENTS
534 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
540 select GENERIC_CLOCKEVENTS
542 Support for Qualcomm MSM7K based systems. This runs on the ARM11
543 apps processor of the MSM7K and depends on a shared memory
544 interface to the ARM9 modem processor which runs the baseband stack
545 and controls some vital subsystems (clock and power control, etc).
552 select ARCH_MAY_HAVE_PC_FDC
553 select HAVE_PATA_PLATFORM
556 select ARCH_SPARSEMEM_ENABLE
558 On the Acorn Risc-PC, Linux can support the internal IDE disk and
559 CD-ROM interface, serial and parallel port, and the floppy drive.
565 select ARCH_SPARSEMEM_ENABLE
569 select GENERIC_CLOCKEVENTS
572 select ARCH_REQUIRE_GPIOLIB
574 Support for StrongARM 11x0 based boards.
577 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
581 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
582 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
583 the Samsung SMDK2410 development board (and derivatives).
586 bool "Samsung S3C64XX"
590 Samsung S3C64XX series based systems
600 Support for the StrongARM based Digital DNARD machine, also known
601 as "Shark" (<http://www.shark-linux.de/shark.html>).
606 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
607 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
609 Say Y here for systems based on one of the Sharp LH7A40X
610 System on a Chip processors. These CPUs include an ARM922T
611 core with a wide array of integrated devices for
612 hand-held and low-power applications.
615 bool "ST-Ericsson U300 Series"
621 select GENERIC_CLOCKEVENTS
626 Support for ST-Ericsson U300 series mobile platforms.
632 select GENERIC_CLOCKEVENTS
634 select ARCH_REQUIRE_GPIOLIB
639 select GENERIC_ALLOCATOR
641 Support for TI's DaVinci platform.
647 select ARCH_REQUIRE_GPIOLIB
649 select GENERIC_CLOCKEVENTS
651 Support for TI's OMAP platform (OMAP1 and OMAP2).
655 source "arch/arm/mach-clps711x/Kconfig"
657 source "arch/arm/mach-ep93xx/Kconfig"
659 source "arch/arm/mach-footbridge/Kconfig"
661 source "arch/arm/mach-gemini/Kconfig"
663 source "arch/arm/mach-integrator/Kconfig"
665 source "arch/arm/mach-iop32x/Kconfig"
667 source "arch/arm/mach-iop33x/Kconfig"
669 source "arch/arm/mach-iop13xx/Kconfig"
671 source "arch/arm/mach-ixp4xx/Kconfig"
673 source "arch/arm/mach-ixp2000/Kconfig"
675 source "arch/arm/mach-ixp23xx/Kconfig"
677 source "arch/arm/mach-loki/Kconfig"
679 source "arch/arm/mach-mv78xx0/Kconfig"
681 source "arch/arm/mach-pxa/Kconfig"
682 source "arch/arm/plat-pxa/Kconfig"
684 source "arch/arm/mach-mmp/Kconfig"
686 source "arch/arm/mach-sa1100/Kconfig"
688 source "arch/arm/plat-omap/Kconfig"
690 source "arch/arm/mach-omap1/Kconfig"
692 source "arch/arm/mach-omap2/Kconfig"
694 source "arch/arm/mach-orion5x/Kconfig"
696 source "arch/arm/mach-kirkwood/Kconfig"
698 source "arch/arm/plat-s3c24xx/Kconfig"
699 source "arch/arm/plat-s3c64xx/Kconfig"
700 source "arch/arm/plat-s3c/Kconfig"
703 source "arch/arm/mach-s3c2400/Kconfig"
704 source "arch/arm/mach-s3c2410/Kconfig"
705 source "arch/arm/mach-s3c2412/Kconfig"
706 source "arch/arm/mach-s3c2440/Kconfig"
707 source "arch/arm/mach-s3c2442/Kconfig"
708 source "arch/arm/mach-s3c2443/Kconfig"
712 source "arch/arm/mach-s3c6400/Kconfig"
713 source "arch/arm/mach-s3c6410/Kconfig"
716 source "arch/arm/plat-stmp3xxx/Kconfig"
718 source "arch/arm/mach-lh7a40x/Kconfig"
720 source "arch/arm/mach-h720x/Kconfig"
722 source "arch/arm/mach-versatile/Kconfig"
724 source "arch/arm/mach-aaec2000/Kconfig"
726 source "arch/arm/mach-realview/Kconfig"
728 source "arch/arm/mach-at91/Kconfig"
730 source "arch/arm/plat-mxc/Kconfig"
732 source "arch/arm/mach-nomadik/Kconfig"
734 source "arch/arm/mach-netx/Kconfig"
736 source "arch/arm/mach-ns9xxx/Kconfig"
738 source "arch/arm/mach-davinci/Kconfig"
740 source "arch/arm/mach-ks8695/Kconfig"
742 source "arch/arm/mach-msm/Kconfig"
744 source "arch/arm/mach-u300/Kconfig"
746 source "arch/arm/mach-w90x900/Kconfig"
748 # Definitions to make life easier
761 source arch/arm/mm/Kconfig
764 bool "Enable iWMMXt support"
765 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
766 default y if PXA27x || PXA3xx || ARCH_MMP
768 Enable support for iWMMXt context switching at run time if
769 running on a CPU that supports it.
771 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
774 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
778 source "arch/arm/Kconfig-nommu"
781 config ARM_ERRATA_411920
782 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
783 depends on CPU_V6 && !SMP
785 Invalidation of the Instruction Cache operation can
786 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
787 It does not affect the MPCore. This option enables the ARM Ltd.
788 recommended workaround.
790 config ARM_ERRATA_430973
791 bool "ARM errata: Stale prediction on replaced interworking branch"
794 This option enables the workaround for the 430973 Cortex-A8
795 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
796 interworking branch is replaced with another code sequence at the
797 same virtual address, whether due to self-modifying code or virtual
798 to physical address re-mapping, Cortex-A8 does not recover from the
799 stale interworking branch prediction. This results in Cortex-A8
800 executing the new code sequence in the incorrect ARM or Thumb state.
801 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
802 and also flushes the branch target cache at every context switch.
803 Note that setting specific bits in the ACTLR register may not be
804 available in non-secure mode.
806 config ARM_ERRATA_458693
807 bool "ARM errata: Processor deadlock when a false hazard is created"
810 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
811 erratum. For very specific sequences of memory operations, it is
812 possible for a hazard condition intended for a cache line to instead
813 be incorrectly associated with a different cache line. This false
814 hazard might then cause a processor deadlock. The workaround enables
815 the L1 caching of the NEON accesses and disables the PLD instruction
816 in the ACTLR register. Note that setting specific bits in the ACTLR
817 register may not be available in non-secure mode.
819 config ARM_ERRATA_460075
820 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
823 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
824 erratum. Any asynchronous access to the L2 cache may encounter a
825 situation in which recent store transactions to the L2 cache are lost
826 and overwritten with stale memory contents from external memory. The
827 workaround disables the write-allocate mode for the L2 cache via the
828 ACTLR register. Note that setting specific bits in the ACTLR register
829 may not be available in non-secure mode.
833 source "arch/arm/common/Kconfig"
835 config FORCE_MAX_ZONEORDER
848 Find out whether you have ISA slots on your motherboard. ISA is the
849 name of a bus system, i.e. the way the CPU talks to the other stuff
850 inside your box. Other bus systems are PCI, EISA, MicroChannel
851 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
852 newer boards don't support it. If you have ISA, say Y, otherwise N.
854 # Select ISA DMA controller support
859 # Select ISA DMA interface
864 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
866 Find out whether you have a PCI motherboard. PCI is the name of a
867 bus system, i.e. the way the CPU talks to the other stuff inside
868 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
869 VESA. If you have PCI, say Y, otherwise N.
874 # Select the host bridge type
875 config PCI_HOST_VIA82C505
877 depends on PCI && ARCH_SHARK
880 config PCI_HOST_ITE8152
882 depends on PCI && MACH_ARMCORE
886 source "drivers/pci/Kconfig"
888 source "drivers/pcmcia/Kconfig"
892 menu "Kernel Features"
894 source "kernel/time/Kconfig"
897 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
898 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
899 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
900 depends on GENERIC_CLOCKEVENTS
901 select USE_GENERIC_SMP_HELPERS
902 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
904 This enables support for systems with more than one CPU. If you have
905 a system with only one CPU, like most personal computers, say N. If
906 you have a system with more than one CPU, say Y.
908 If you say N here, the kernel will run on single and multiprocessor
909 machines, but will use only one CPU of a multiprocessor machine. If
910 you say Y here, the kernel will run on many, but not all, single
911 processor machines. On a single processor machine, the kernel will
912 run faster if you say N here.
914 See also <file:Documentation/i386/IO-APIC.txt>,
915 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
916 <http://www.linuxdoc.org/docs.html#howto>.
918 If you don't know what to do here, say N.
924 This option enables support for the ARM system coherency unit
930 This options enables support for the ARM timer and watchdog unit
933 prompt "Memory split"
936 Select the desired split between kernel and user memory.
938 If you are not absolutely sure what you are doing, leave this
942 bool "3G/1G user/kernel split"
944 bool "2G/2G user/kernel split"
946 bool "1G/3G user/kernel split"
951 default 0x40000000 if VMSPLIT_1G
952 default 0x80000000 if VMSPLIT_2G
956 int "Maximum number of CPUs (2-32)"
962 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
963 depends on SMP && HOTPLUG && EXPERIMENTAL
965 Say Y here to experiment with turning CPUs off and on. CPUs
966 can be controlled through /sys/devices/system/cpu.
969 bool "Use local timer interrupts"
970 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
971 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
973 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
975 Enable support for local timers on SMP platforms, rather then the
976 legacy IPI broadcast method. Local timers allows the system
977 accounting to be spread across the timer interval, preventing a
978 "thundering herd" at every timer tick.
981 bool "Preemptible Kernel (EXPERIMENTAL)"
982 depends on EXPERIMENTAL
984 This option reduces the latency of the kernel when reacting to
985 real-time or interactive events by allowing a low priority process to
986 be preempted even if it is in kernel mode executing a system call.
987 This allows applications to run more reliably even when the system is
990 Say Y here if you are building a kernel for a desktop, embedded
991 or real-time system. Say N if you are unsure.
995 default 128 if ARCH_L7200
996 default 200 if ARCH_EBSA110 || ARCH_S3C2410
997 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
998 default AT91_TIMER_HZ if ARCH_AT91
1002 bool "Use the ARM EABI to compile the kernel"
1004 This option allows for the kernel to be compiled using the latest
1005 ARM ABI (aka EABI). This is only useful if you are using a user
1006 space environment that is also compiled with EABI.
1008 Since there are major incompatibilities between the legacy ABI and
1009 EABI, especially with regard to structure member alignment, this
1010 option also changes the kernel syscall calling convention to
1011 disambiguate both ABIs and allow for backward compatibility support
1012 (selected with CONFIG_OABI_COMPAT).
1014 To use this you need GCC version 4.0.0 or later.
1017 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1018 depends on AEABI && EXPERIMENTAL
1021 This option preserves the old syscall interface along with the
1022 new (ARM EABI) one. It also provides a compatibility layer to
1023 intercept syscalls that have structure arguments which layout
1024 in memory differs between the legacy ABI and the new ARM EABI
1025 (only for non "thumb" binaries). This option adds a tiny
1026 overhead to all syscalls and produces a slightly larger kernel.
1027 If you know you'll be using only pure EABI user space then you
1028 can say N here. If this option is not selected and you attempt
1029 to execute a legacy ABI binary then the result will be
1030 UNPREDICTABLE (in fact it can be predicted that it won't work
1031 at all). If in doubt say Y.
1033 config ARCH_HAS_HOLES_MEMORYMODEL
1036 # Discontigmem is deprecated
1037 config ARCH_DISCONTIGMEM_ENABLE
1040 config ARCH_SPARSEMEM_ENABLE
1043 config ARCH_SPARSEMEM_DEFAULT
1044 def_bool ARCH_SPARSEMEM_ENABLE
1046 config ARCH_SELECT_MEMORY_MODEL
1047 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1051 default "4" if ARCH_LH7A40X
1053 depends on NEED_MULTIPLE_NODES
1056 bool "High Memory Support (EXPERIMENTAL)"
1057 depends on MMU && EXPERIMENTAL
1059 The address space of ARM processors is only 4 Gigabytes large
1060 and it has to accommodate user address space, kernel address
1061 space as well as some memory mapped IO. That means that, if you
1062 have a large amount of physical memory and/or IO, not all of the
1063 memory can be "permanently mapped" by the kernel. The physical
1064 memory that is not permanently mapped is called "high memory".
1066 Depending on the selected kernel/user memory split, minimum
1067 vmalloc space and actual amount of RAM, you may not need this
1068 option which should result in a slightly faster kernel.
1075 bool "Timer and CPU usage LEDs"
1076 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1077 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1078 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1079 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1080 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1081 ARCH_AT91 || ARCH_DAVINCI || \
1082 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1084 If you say Y here, the LEDs on your machine will be used
1085 to provide useful information about your current system status.
1087 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1088 be able to select which LEDs are active using the options below. If
1089 you are compiling a kernel for the EBSA-110 or the LART however, the
1090 red LED will simply flash regularly to indicate that the system is
1091 still functional. It is safe to say Y here if you have a CATS
1092 system, but the driver will do nothing.
1095 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1096 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1097 || MACH_OMAP_PERSEUS2
1099 depends on !GENERIC_CLOCKEVENTS
1100 default y if ARCH_EBSA110
1102 If you say Y here, one of the system LEDs (the green one on the
1103 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1104 will flash regularly to indicate that the system is still
1105 operational. This is mainly useful to kernel hackers who are
1106 debugging unstable kernels.
1108 The LART uses the same LED for both Timer LED and CPU usage LED
1109 functions. You may choose to use both, but the Timer LED function
1110 will overrule the CPU usage LED.
1113 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1115 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1116 || MACH_OMAP_PERSEUS2
1119 If you say Y here, the red LED will be used to give a good real
1120 time indication of CPU usage, by lighting whenever the idle task
1121 is not currently executing.
1123 The LART uses the same LED for both Timer LED and CPU usage LED
1124 functions. You may choose to use both, but the Timer LED function
1125 will overrule the CPU usage LED.
1127 config ALIGNMENT_TRAP
1129 depends on CPU_CP15_MMU
1130 default y if !ARCH_EBSA110
1132 ARM processors cannot fetch/store information which is not
1133 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1134 address divisible by 4. On 32-bit ARM processors, these non-aligned
1135 fetch/store instructions will be emulated in software if you say
1136 here, which has a severe performance impact. This is necessary for
1137 correct operation of some network protocols. With an IP-only
1138 configuration it is safe to say N, otherwise say Y.
1140 config UACCESS_WITH_MEMCPY
1141 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1142 depends on MMU && EXPERIMENTAL
1143 default y if CPU_FEROCEON
1145 Implement faster copy_to_user and clear_user methods for CPU
1146 cores where a 8-word STM instruction give significantly higher
1147 memory write throughput than a sequence of individual 32bit stores.
1149 A possible side effect is a slight increase in scheduling latency
1150 between threads sharing the same address space if they invoke
1151 such copy operations with large buffers.
1153 However, if the CPU data cache is using a write-allocate mode,
1154 this option is unlikely to provide any performance gain.
1160 # Compressed boot loader in ROM. Yes, we really want to ask about
1161 # TEXT and BSS so we preserve their values in the config files.
1162 config ZBOOT_ROM_TEXT
1163 hex "Compressed ROM boot loader base address"
1166 The physical address at which the ROM-able zImage is to be
1167 placed in the target. Platforms which normally make use of
1168 ROM-able zImage formats normally set this to a suitable
1169 value in their defconfig file.
1171 If ZBOOT_ROM is not enabled, this has no effect.
1173 config ZBOOT_ROM_BSS
1174 hex "Compressed ROM boot loader BSS address"
1177 The base address of an area of read/write memory in the target
1178 for the ROM-able zImage which must be available while the
1179 decompressor is running. It must be large enough to hold the
1180 entire decompressed kernel plus an additional 128 KiB.
1181 Platforms which normally make use of ROM-able zImage formats
1182 normally set this to a suitable value in their defconfig file.
1184 If ZBOOT_ROM is not enabled, this has no effect.
1187 bool "Compressed boot loader in ROM/flash"
1188 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1190 Say Y here if you intend to execute your compressed kernel image
1191 (zImage) directly from ROM or flash. If unsure, say N.
1194 string "Default kernel command string"
1197 On some architectures (EBSA110 and CATS), there is currently no way
1198 for the boot loader to pass arguments to the kernel. For these
1199 architectures, you should supply some command-line options at build
1200 time by entering them here. As a minimum, you should specify the
1201 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1204 bool "Kernel Execute-In-Place from ROM"
1205 depends on !ZBOOT_ROM
1207 Execute-In-Place allows the kernel to run from non-volatile storage
1208 directly addressable by the CPU, such as NOR flash. This saves RAM
1209 space since the text section of the kernel is not loaded from flash
1210 to RAM. Read-write sections, such as the data section and stack,
1211 are still copied to RAM. The XIP kernel is not compressed since
1212 it has to run directly from flash, so it will take more space to
1213 store it. The flash address used to link the kernel object files,
1214 and for storing it, is configuration dependent. Therefore, if you
1215 say Y here, you must know the proper physical address where to
1216 store the kernel image depending on your own flash memory usage.
1218 Also note that the make target becomes "make xipImage" rather than
1219 "make zImage" or "make Image". The final kernel binary to put in
1220 ROM memory will be arch/arm/boot/xipImage.
1224 config XIP_PHYS_ADDR
1225 hex "XIP Kernel Physical Location"
1226 depends on XIP_KERNEL
1227 default "0x00080000"
1229 This is the physical address in your flash memory the kernel will
1230 be linked for and stored to. This address is dependent on your
1234 bool "Kexec system call (EXPERIMENTAL)"
1235 depends on EXPERIMENTAL
1237 kexec is a system call that implements the ability to shutdown your
1238 current kernel, and to start another kernel. It is like a reboot
1239 but it is independent of the system firmware. And like a reboot
1240 you can start any kernel with it, not just Linux.
1242 It is an ongoing process to be certain the hardware in a machine
1243 is properly shutdown, so do not be surprised if this code does not
1244 initially work for you. It may help to enable device hotplugging
1248 bool "Export atags in procfs"
1252 Should the atags used to boot the kernel be exported in an "atags"
1253 file in procfs. Useful with kexec.
1257 menu "CPU Power Management"
1259 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA || ARCH_S3C64XX)
1261 source "drivers/cpufreq/Kconfig"
1263 config CPU_FREQ_SA1100
1265 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1268 config CPU_FREQ_SA1110
1270 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1273 config CPU_FREQ_INTEGRATOR
1274 tristate "CPUfreq driver for ARM Integrator CPUs"
1275 depends on ARCH_INTEGRATOR && CPU_FREQ
1278 This enables the CPUfreq driver for ARM Integrator CPUs.
1280 For details, take a look at <file:Documentation/cpu-freq>.
1286 depends on CPU_FREQ && ARCH_PXA && PXA25x
1288 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1290 config CPU_FREQ_S3C64XX
1291 bool "CPUfreq support for Samsung S3C64XX CPUs"
1292 depends on CPU_FREQ && CPU_S3C6410
1296 source "drivers/cpuidle/Kconfig"
1300 menu "Floating point emulation"
1302 comment "At least one emulation must be selected"
1305 bool "NWFPE math emulation"
1306 depends on !AEABI || OABI_COMPAT
1308 Say Y to include the NWFPE floating point emulator in the kernel.
1309 This is necessary to run most binaries. Linux does not currently
1310 support floating point hardware so you need to say Y here even if
1311 your machine has an FPA or floating point co-processor podule.
1313 You may say N here if you are going to load the Acorn FPEmulator
1314 early in the bootup.
1317 bool "Support extended precision"
1318 depends on FPE_NWFPE
1320 Say Y to include 80-bit support in the kernel floating-point
1321 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1322 Note that gcc does not generate 80-bit operations by default,
1323 so in most cases this option only enlarges the size of the
1324 floating point emulator without any good reason.
1326 You almost surely want to say N here.
1329 bool "FastFPE math emulation (EXPERIMENTAL)"
1330 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1332 Say Y here to include the FAST floating point emulator in the kernel.
1333 This is an experimental much faster emulator which now also has full
1334 precision for the mantissa. It does not support any exceptions.
1335 It is very simple, and approximately 3-6 times faster than NWFPE.
1337 It should be sufficient for most programs. It may be not suitable
1338 for scientific calculations, but you have to check this for yourself.
1339 If you do not feel you need a faster FP emulation you should better
1343 bool "VFP-format floating point maths"
1344 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1346 Say Y to include VFP support code in the kernel. This is needed
1347 if your hardware includes a VFP unit.
1349 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1350 release notes and additional status information.
1352 Say N if your target does not have VFP hardware.
1360 bool "Advanced SIMD (NEON) Extension support"
1361 depends on VFPv3 && CPU_V7
1363 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1368 menu "Userspace binary formats"
1370 source "fs/Kconfig.binfmt"
1373 tristate "RISC OS personality"
1376 Say Y here to include the kernel code necessary if you want to run
1377 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1378 experimental; if this sounds frightening, say N and sleep in peace.
1379 You can also say M here to compile this support as a module (which
1380 will be called arthur).
1384 menu "Power management options"
1386 source "kernel/power/Kconfig"
1388 config ARCH_SUSPEND_POSSIBLE
1393 source "net/Kconfig"
1395 menu "Device Drivers"
1397 source "drivers/base/Kconfig"
1399 source "drivers/connector/Kconfig"
1401 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1402 source "drivers/mtd/Kconfig"
1405 source "drivers/parport/Kconfig"
1407 source "drivers/pnp/Kconfig"
1409 source "drivers/block/Kconfig"
1411 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1413 source "drivers/misc/Kconfig"
1415 source "drivers/ide/Kconfig"
1417 source "drivers/scsi/Kconfig"
1419 source "drivers/ata/Kconfig"
1421 source "drivers/md/Kconfig"
1423 source "drivers/message/fusion/Kconfig"
1425 source "drivers/ieee1394/Kconfig"
1427 source "drivers/message/i2o/Kconfig"
1429 source "drivers/net/Kconfig"
1431 source "drivers/isdn/Kconfig"
1433 # input before char - char/joystick depends on it. As does USB.
1435 source "drivers/input/Kconfig"
1437 source "drivers/char/Kconfig"
1439 source "drivers/i2c/Kconfig"
1441 source "drivers/spi/Kconfig"
1443 source "drivers/gpio/Kconfig"
1445 source "drivers/w1/Kconfig"
1447 source "drivers/power/Kconfig"
1449 source "drivers/hwmon/Kconfig"
1451 source "drivers/thermal/Kconfig"
1453 source "drivers/watchdog/Kconfig"
1455 source "drivers/ssb/Kconfig"
1457 #source "drivers/l3/Kconfig"
1459 source "drivers/mfd/Kconfig"
1461 source "drivers/media/Kconfig"
1463 source "drivers/video/Kconfig"
1465 source "sound/Kconfig"
1467 source "drivers/hid/Kconfig"
1469 source "drivers/usb/Kconfig"
1471 source "drivers/uwb/Kconfig"
1473 source "drivers/mmc/Kconfig"
1475 source "drivers/memstick/Kconfig"
1477 source "drivers/accessibility/Kconfig"
1479 source "drivers/leds/Kconfig"
1481 source "drivers/rtc/Kconfig"
1483 source "drivers/dma/Kconfig"
1485 source "drivers/dca/Kconfig"
1487 source "drivers/auxdisplay/Kconfig"
1489 source "drivers/regulator/Kconfig"
1491 source "drivers/uio/Kconfig"
1493 source "drivers/staging/Kconfig"
1499 source "arch/arm/Kconfig.debug"
1501 source "security/Kconfig"
1503 source "crypto/Kconfig"
1505 source "lib/Kconfig"