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
21 select HAVE_KERNEL_GZIP
22 select HAVE_KERNEL_LZO
24 The ARM series is a line of low-power-consumption RISC chip designs
25 licensed by ARM Ltd and targeted at embedded applications and
26 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
27 manufactured, but legacy ARM-based PC hardware remains popular in
28 Europe. There is an ARM Linux project with a web page at
29 <http://www.arm.linux.org.uk/>.
34 config SYS_SUPPORTS_APM_EMULATION
43 config GENERIC_CLOCKEVENTS
46 config GENERIC_CLOCKEVENTS_BROADCAST
48 depends on GENERIC_CLOCKEVENTS
49 default y if SMP && !LOCAL_TIMERS
53 select GENERIC_ALLOCATOR
61 The Extended Industry Standard Architecture (EISA) bus was
62 developed as an open alternative to the IBM MicroChannel bus.
64 The EISA bus provided some of the features of the IBM MicroChannel
65 bus while maintaining backward compatibility with cards made for
66 the older ISA bus. The EISA bus saw limited use between 1988 and
67 1995 when it was made obsolete by the PCI bus.
69 Say Y here if you are building a kernel for an EISA-based machine.
79 MicroChannel Architecture is found in some IBM PS/2 machines and
80 laptops. It is a bus system similar to PCI or ISA. See
81 <file:Documentation/mca.txt> (and especially the web page given
82 there) before attempting to build an MCA bus kernel.
84 config GENERIC_HARDIRQS
88 config STACKTRACE_SUPPORT
92 config HAVE_LATENCYTOP_SUPPORT
97 config LOCKDEP_SUPPORT
101 config TRACE_IRQFLAGS_SUPPORT
105 config HARDIRQS_SW_RESEND
109 config GENERIC_IRQ_PROBE
113 config GENERIC_LOCKBREAK
116 depends on SMP && PREEMPT
118 config RWSEM_GENERIC_SPINLOCK
122 config RWSEM_XCHGADD_ALGORITHM
125 config ARCH_HAS_ILOG2_U32
128 config ARCH_HAS_ILOG2_U64
131 config ARCH_HAS_CPUFREQ
134 Internal node to signify that the ARCH has CPUFREQ support
135 and that the relevant menu configurations are displayed for
138 config GENERIC_HWEIGHT
142 config GENERIC_CALIBRATE_DELAY
146 config ARCH_MAY_HAVE_PC_FDC
152 config GENERIC_ISA_DMA
161 config GENERIC_HARDIRQS_NO__DO_IRQ
166 config OPROFILE_ARMV6
168 depends on CPU_V6 && !SMP
169 select OPROFILE_ARM11_CORE
171 config OPROFILE_MPCORE
173 depends on CPU_V6 && SMP
174 select OPROFILE_ARM11_CORE
176 config OPROFILE_ARM11_CORE
179 config OPROFILE_ARMV7
181 depends on CPU_V7 && !SMP
188 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
189 default DRAM_BASE if REMAP_VECTORS_TO_RAM
192 The base address of exception vectors.
194 source "init/Kconfig"
196 source "kernel/Kconfig.freezer"
201 bool "MMU-based Paged Memory Management Support"
204 Select if you want MMU-based virtualised addressing space
205 support by paged memory management. If unsure, say 'Y'.
208 prompt "ARM system type"
209 default ARCH_VERSATILE
212 bool "Agilent AAEC-2000 based"
217 This enables support for systems based on the Agilent AAEC-2000
219 config ARCH_INTEGRATOR
220 bool "ARM Ltd. Integrator family"
222 select ARCH_HAS_CPUFREQ
227 Support for ARM's Integrator platform.
230 bool "ARM Ltd. RealView family"
236 select GENERIC_CLOCKEVENTS
237 select ARCH_WANT_OPTIONAL_GPIOLIB
239 This enables support for ARM Ltd RealView boards.
241 config ARCH_VERSATILE
242 bool "ARM Ltd. Versatile family"
249 select GENERIC_CLOCKEVENTS
250 select ARCH_WANT_OPTIONAL_GPIOLIB
252 This enables support for ARM Ltd Versatile board.
257 select ARCH_REQUIRE_GPIOLIB
260 This enables support for systems based on the Atmel AT91RM9200,
261 AT91SAM9 and AT91CAP9 processors.
264 bool "Cirrus Logic CLPS711x/EP721x-based"
267 Support for Cirrus Logic 711x/721x based boards.
270 bool "Cortina Systems Gemini"
273 select ARCH_REQUIRE_GPIOLIB
275 Support for the Cortina Systems Gemini family SoCs
283 This is an evaluation board for the StrongARM processor available
284 from Digital. It has limited hardware on-board, including an
285 Ethernet interface, two PCMCIA sockets, two serial ports and a
296 select ARCH_REQUIRE_GPIOLIB
297 select ARCH_HAS_HOLES_MEMORYMODEL
299 This enables support for the Cirrus EP93xx series of CPUs.
301 config ARCH_FOOTBRIDGE
306 Support for systems based on the DC21285 companion chip
307 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
310 bool "Freescale MXC/iMX-based"
312 select GENERIC_CLOCKEVENTS
313 select ARCH_REQUIRE_GPIOLIB
317 Support for Freescale MXC/iMX-based family of processors
320 bool "Freescale STMP3xxx"
324 select ARCH_REQUIRE_GPIOLIB
326 select GENERIC_CLOCKEVENTS
328 select USB_ARCH_HAS_EHCI
330 Support for systems based on the Freescale 3xxx CPUs.
333 bool "Hilscher NetX based"
336 select GENERIC_CLOCKEVENTS
339 This enables support for systems based on the Hilscher NetX Soc
342 bool "Hynix HMS720x-based"
346 This enables support for systems based on the Hynix HMS720x
349 bool "STMicroelectronics Nomadik"
356 select GENERIC_CLOCKEVENTS
358 select ARCH_REQUIRE_GPIOLIB
360 Support for the Nomadik platform by ST-Ericsson
368 select ARCH_SUPPORTS_MSI
371 Support for Intel's IOP13XX (XScale) family of processors.
380 select ARCH_REQUIRE_GPIOLIB
382 Support for Intel's 80219 and IOP32X (XScale) family of
392 select ARCH_REQUIRE_GPIOLIB
394 Support for Intel's IOP33X (XScale) family of processors.
402 Support for Intel's IXP23xx (XScale) family of processors.
405 bool "IXP2400/2800-based"
410 Support for Intel's IXP2400/2800 (XScale) family of processors.
418 select GENERIC_CLOCKEVENTS
419 select DMABOUNCE if PCI
421 Support for Intel's IXP4XX (XScale) family of processors.
428 Say Y here if you intend to run this kernel on a LinkUp Systems
429 L7200 Software Development Board which uses an ARM720T processor.
430 Information on this board can be obtained at:
432 <http://www.linkupsys.com/>
434 If you have any questions or comments about the Linux kernel port
435 to this board, send e-mail to <sjhill@cotw.com>.
441 select ARCH_REQUIRE_GPIOLIB
443 select GENERIC_CLOCKEVENTS
446 Support for the Marvell Dove SoC 88AP510
449 bool "Marvell Kirkwood"
453 select ARCH_REQUIRE_GPIOLIB
455 select GENERIC_CLOCKEVENTS
458 Support for the following Marvell Kirkwood series SoCs:
459 88F6180, 88F6192 and 88F6281.
462 bool "Marvell Loki (88RC8480)"
465 select GENERIC_CLOCKEVENTS
468 Support for the Marvell Loki (88RC8480) SoC.
471 bool "Marvell MV78xx0"
475 select ARCH_REQUIRE_GPIOLIB
477 select GENERIC_CLOCKEVENTS
480 Support for the following Marvell MV78xx0 series SoCs:
489 select ARCH_REQUIRE_GPIOLIB
491 select GENERIC_CLOCKEVENTS
494 Support for the following Marvell Orion 5x series SoCs:
495 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
496 Orion-2 (5281), Orion-1-90 (6183).
499 bool "Marvell PXA168/910/MMP2"
502 select ARCH_REQUIRE_GPIOLIB
506 select GENERIC_CLOCKEVENTS
510 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
513 bool "Micrel/Kendin KS8695"
516 select ARCH_REQUIRE_GPIOLIB
518 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
519 System-on-Chip devices.
522 bool "NetSilicon NS9xxx"
526 select GENERIC_CLOCKEVENTS
529 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
532 <http://www.digi.com/products/microprocessors/index.jsp>
535 bool "Nuvoton W90X900 CPU"
537 select ARCH_REQUIRE_GPIOLIB
542 select GENERIC_CLOCKEVENTS
544 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
545 At present, the w90x900 has been renamed nuc900, regarding
546 the ARM series product line, you can login the following
547 link address to know more.
549 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
550 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
553 bool "Philips Nexperia PNX4008 Mobile"
557 This enables support for Philips PNX4008 mobile platform.
560 bool "PXA2xx/PXA3xx-based"
563 select ARCH_HAS_CPUFREQ
567 select ARCH_REQUIRE_GPIOLIB
569 select GENERIC_CLOCKEVENTS
573 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
579 select GENERIC_CLOCKEVENTS
581 Support for Qualcomm MSM7K based systems. This runs on the ARM11
582 apps processor of the MSM7K and depends on a shared memory
583 interface to the ARM9 modem processor which runs the baseband stack
584 and controls some vital subsystems (clock and power control, etc).
587 bool "Renesas SH-Mobile"
589 Support for Renesas's SH-Mobile ARM platforms
596 select ARCH_MAY_HAVE_PC_FDC
597 select HAVE_PATA_PLATFORM
600 select ARCH_SPARSEMEM_ENABLE
602 On the Acorn Risc-PC, Linux can support the internal IDE disk and
603 CD-ROM interface, serial and parallel port, and the floppy drive.
609 select ARCH_SPARSEMEM_ENABLE
611 select ARCH_HAS_CPUFREQ
615 select GENERIC_CLOCKEVENTS
618 select ARCH_REQUIRE_GPIOLIB
620 Support for StrongARM 11x0 based boards.
623 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
625 select ARCH_HAS_CPUFREQ
628 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
629 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
630 the Samsung SMDK2410 development board (and derivatives).
633 bool "Samsung S3C64XX"
640 select ARCH_HAS_CPUFREQ
641 select ARCH_REQUIRE_GPIOLIB
642 select SAMSUNG_CLKSRC
643 select SAMSUNG_IRQ_VIC_TIMER
644 select SAMSUNG_IRQ_UART
645 select S3C_GPIO_TRACK
646 select S3C_GPIO_PULL_UPDOWN
647 select S3C_GPIO_CFG_S3C24XX
648 select S3C_GPIO_CFG_S3C64XX
650 select USB_ARCH_HAS_OHCI
651 select SAMSUNG_GPIOLIB_4BIT
653 Samsung S3C64XX series based systems
656 bool "Samsung S5P6440"
661 Samsung S5P6440 CPU based systems
664 bool "Samsung S5P6442"
669 Samsung S5P6442 CPU based systems
672 bool "Samsung S5PC1XX"
677 Samsung S5PC1XX series based systems
680 bool "Samsung S5PV210/S5PC110"
684 select ARM_L1_CACHE_SHIFT_6
686 Samsung S5PV210/S5PC110 series based systems
696 Support for the StrongARM based Digital DNARD machine, also known
697 as "Shark" (<http://www.shark-linux.de/shark.html>).
702 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
703 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
705 Say Y here for systems based on one of the Sharp LH7A40X
706 System on a Chip processors. These CPUs include an ARM922T
707 core with a wide array of integrated devices for
708 hand-held and low-power applications.
711 bool "ST-Ericsson U300 Series"
718 select GENERIC_CLOCKEVENTS
723 Support for ST-Ericsson U300 series mobile platforms.
729 select GENERIC_CLOCKEVENTS
731 select ARCH_REQUIRE_GPIOLIB
736 select GENERIC_ALLOCATOR
737 select ARCH_HAS_HOLES_MEMORYMODEL
739 Support for TI's DaVinci platform.
745 select ARCH_REQUIRE_GPIOLIB
746 select ARCH_HAS_CPUFREQ
748 select GENERIC_CLOCKEVENTS
749 select ARCH_HAS_HOLES_MEMORYMODEL
751 Support for TI's OMAP platform (OMAP1 and OMAP2).
754 bool "Broadcom BCMRING"
760 select GENERIC_CLOCKEVENTS
761 select ARCH_WANT_OPTIONAL_GPIOLIB
763 Support for Broadcom's BCMRing platform.
766 bool "ST-Ericsson U8500 Series"
770 select GENERIC_CLOCKEVENTS
773 Support for ST-Ericsson's Ux500 architecture
777 source "arch/arm/mach-aaec2000/Kconfig"
779 source "arch/arm/mach-at91/Kconfig"
781 source "arch/arm/mach-bcmring/Kconfig"
783 source "arch/arm/mach-clps711x/Kconfig"
785 source "arch/arm/mach-davinci/Kconfig"
787 source "arch/arm/mach-dove/Kconfig"
789 source "arch/arm/mach-ep93xx/Kconfig"
791 source "arch/arm/mach-footbridge/Kconfig"
793 source "arch/arm/mach-gemini/Kconfig"
795 source "arch/arm/mach-h720x/Kconfig"
797 source "arch/arm/mach-integrator/Kconfig"
799 source "arch/arm/mach-iop32x/Kconfig"
801 source "arch/arm/mach-iop33x/Kconfig"
803 source "arch/arm/mach-iop13xx/Kconfig"
805 source "arch/arm/mach-ixp4xx/Kconfig"
807 source "arch/arm/mach-ixp2000/Kconfig"
809 source "arch/arm/mach-ixp23xx/Kconfig"
811 source "arch/arm/mach-kirkwood/Kconfig"
813 source "arch/arm/mach-ks8695/Kconfig"
815 source "arch/arm/mach-lh7a40x/Kconfig"
817 source "arch/arm/mach-loki/Kconfig"
819 source "arch/arm/mach-msm/Kconfig"
821 source "arch/arm/mach-mv78xx0/Kconfig"
823 source "arch/arm/plat-mxc/Kconfig"
825 source "arch/arm/mach-netx/Kconfig"
827 source "arch/arm/mach-nomadik/Kconfig"
828 source "arch/arm/plat-nomadik/Kconfig"
830 source "arch/arm/mach-ns9xxx/Kconfig"
832 source "arch/arm/plat-omap/Kconfig"
834 source "arch/arm/mach-omap1/Kconfig"
836 source "arch/arm/mach-omap2/Kconfig"
838 source "arch/arm/mach-orion5x/Kconfig"
840 source "arch/arm/mach-pxa/Kconfig"
841 source "arch/arm/plat-pxa/Kconfig"
843 source "arch/arm/mach-mmp/Kconfig"
845 source "arch/arm/mach-realview/Kconfig"
847 source "arch/arm/mach-sa1100/Kconfig"
849 source "arch/arm/plat-samsung/Kconfig"
850 source "arch/arm/plat-s3c24xx/Kconfig"
851 source "arch/arm/plat-s5p/Kconfig"
852 source "arch/arm/plat-s5pc1xx/Kconfig"
855 source "arch/arm/mach-s3c2400/Kconfig"
856 source "arch/arm/mach-s3c2410/Kconfig"
857 source "arch/arm/mach-s3c2412/Kconfig"
858 source "arch/arm/mach-s3c2440/Kconfig"
859 source "arch/arm/mach-s3c2443/Kconfig"
863 source "arch/arm/mach-s3c64xx/Kconfig"
866 source "arch/arm/mach-s5p6440/Kconfig"
868 source "arch/arm/mach-s5p6442/Kconfig"
871 source "arch/arm/mach-s5pc100/Kconfig"
874 source "arch/arm/mach-s5pv210/Kconfig"
876 source "arch/arm/mach-shmobile/Kconfig"
878 source "arch/arm/plat-stmp3xxx/Kconfig"
880 source "arch/arm/mach-u300/Kconfig"
882 source "arch/arm/mach-ux500/Kconfig"
884 source "arch/arm/mach-versatile/Kconfig"
886 source "arch/arm/mach-w90x900/Kconfig"
888 # Definitions to make life easier
894 select GENERIC_CLOCKEVENTS
903 source arch/arm/mm/Kconfig
906 bool "Enable iWMMXt support"
907 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
908 default y if PXA27x || PXA3xx || ARCH_MMP
910 Enable support for iWMMXt context switching at run time if
911 running on a CPU that supports it.
913 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
916 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
920 source "arch/arm/Kconfig-nommu"
923 config ARM_ERRATA_411920
924 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
925 depends on CPU_V6 && !SMP
927 Invalidation of the Instruction Cache operation can
928 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
929 It does not affect the MPCore. This option enables the ARM Ltd.
930 recommended workaround.
932 config ARM_ERRATA_430973
933 bool "ARM errata: Stale prediction on replaced interworking branch"
936 This option enables the workaround for the 430973 Cortex-A8
937 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
938 interworking branch is replaced with another code sequence at the
939 same virtual address, whether due to self-modifying code or virtual
940 to physical address re-mapping, Cortex-A8 does not recover from the
941 stale interworking branch prediction. This results in Cortex-A8
942 executing the new code sequence in the incorrect ARM or Thumb state.
943 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
944 and also flushes the branch target cache at every context switch.
945 Note that setting specific bits in the ACTLR register may not be
946 available in non-secure mode.
948 config ARM_ERRATA_458693
949 bool "ARM errata: Processor deadlock when a false hazard is created"
952 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
953 erratum. For very specific sequences of memory operations, it is
954 possible for a hazard condition intended for a cache line to instead
955 be incorrectly associated with a different cache line. This false
956 hazard might then cause a processor deadlock. The workaround enables
957 the L1 caching of the NEON accesses and disables the PLD instruction
958 in the ACTLR register. Note that setting specific bits in the ACTLR
959 register may not be available in non-secure mode.
961 config ARM_ERRATA_460075
962 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
965 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
966 erratum. Any asynchronous access to the L2 cache may encounter a
967 situation in which recent store transactions to the L2 cache are lost
968 and overwritten with stale memory contents from external memory. The
969 workaround disables the write-allocate mode for the L2 cache via the
970 ACTLR register. Note that setting specific bits in the ACTLR register
971 may not be available in non-secure mode.
975 source "arch/arm/common/Kconfig"
977 config FORCE_MAX_ZONEORDER
990 Find out whether you have ISA slots on your motherboard. ISA is the
991 name of a bus system, i.e. the way the CPU talks to the other stuff
992 inside your box. Other bus systems are PCI, EISA, MicroChannel
993 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
994 newer boards don't support it. If you have ISA, say Y, otherwise N.
996 # Select ISA DMA controller support
1001 # Select ISA DMA interface
1006 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1008 Find out whether you have a PCI motherboard. PCI is the name of a
1009 bus system, i.e. the way the CPU talks to the other stuff inside
1010 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1011 VESA. If you have PCI, say Y, otherwise N.
1016 # Select the host bridge type
1017 config PCI_HOST_VIA82C505
1019 depends on PCI && ARCH_SHARK
1022 config PCI_HOST_ITE8152
1024 depends on PCI && MACH_ARMCORE
1028 source "drivers/pci/Kconfig"
1030 source "drivers/pcmcia/Kconfig"
1034 menu "Kernel Features"
1036 source "kernel/time/Kconfig"
1039 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1040 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1041 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1042 depends on GENERIC_CLOCKEVENTS
1043 select USE_GENERIC_SMP_HELPERS
1044 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1046 This enables support for systems with more than one CPU. If you have
1047 a system with only one CPU, like most personal computers, say N. If
1048 you have a system with more than one CPU, say Y.
1050 If you say N here, the kernel will run on single and multiprocessor
1051 machines, but will use only one CPU of a multiprocessor machine. If
1052 you say Y here, the kernel will run on many, but not all, single
1053 processor machines. On a single processor machine, the kernel will
1054 run faster if you say N here.
1056 See also <file:Documentation/i386/IO-APIC.txt>,
1057 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1058 <http://www.linuxdoc.org/docs.html#howto>.
1060 If you don't know what to do here, say N.
1066 This option enables support for the ARM system coherency unit
1072 This options enables support for the ARM timer and watchdog unit
1075 prompt "Memory split"
1078 Select the desired split between kernel and user memory.
1080 If you are not absolutely sure what you are doing, leave this
1084 bool "3G/1G user/kernel split"
1086 bool "2G/2G user/kernel split"
1088 bool "1G/3G user/kernel split"
1093 default 0x40000000 if VMSPLIT_1G
1094 default 0x80000000 if VMSPLIT_2G
1098 int "Maximum number of CPUs (2-32)"
1104 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1105 depends on SMP && HOTPLUG && EXPERIMENTAL
1107 Say Y here to experiment with turning CPUs off and on. CPUs
1108 can be controlled through /sys/devices/system/cpu.
1111 bool "Use local timer interrupts"
1112 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1113 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1115 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1117 Enable support for local timers on SMP platforms, rather then the
1118 legacy IPI broadcast method. Local timers allows the system
1119 accounting to be spread across the timer interval, preventing a
1120 "thundering herd" at every timer tick.
1122 source kernel/Kconfig.preempt
1126 default 128 if ARCH_L7200
1127 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1128 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1129 default AT91_TIMER_HZ if ARCH_AT91
1132 config THUMB2_KERNEL
1133 bool "Compile the kernel in Thumb-2 mode"
1134 depends on CPU_V7 && EXPERIMENTAL
1136 select ARM_ASM_UNIFIED
1138 By enabling this option, the kernel will be compiled in
1139 Thumb-2 mode. A compiler/assembler that understand the unified
1140 ARM-Thumb syntax is needed.
1144 config ARM_ASM_UNIFIED
1148 bool "Use the ARM EABI to compile the kernel"
1150 This option allows for the kernel to be compiled using the latest
1151 ARM ABI (aka EABI). This is only useful if you are using a user
1152 space environment that is also compiled with EABI.
1154 Since there are major incompatibilities between the legacy ABI and
1155 EABI, especially with regard to structure member alignment, this
1156 option also changes the kernel syscall calling convention to
1157 disambiguate both ABIs and allow for backward compatibility support
1158 (selected with CONFIG_OABI_COMPAT).
1160 To use this you need GCC version 4.0.0 or later.
1163 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1164 depends on AEABI && EXPERIMENTAL
1167 This option preserves the old syscall interface along with the
1168 new (ARM EABI) one. It also provides a compatibility layer to
1169 intercept syscalls that have structure arguments which layout
1170 in memory differs between the legacy ABI and the new ARM EABI
1171 (only for non "thumb" binaries). This option adds a tiny
1172 overhead to all syscalls and produces a slightly larger kernel.
1173 If you know you'll be using only pure EABI user space then you
1174 can say N here. If this option is not selected and you attempt
1175 to execute a legacy ABI binary then the result will be
1176 UNPREDICTABLE (in fact it can be predicted that it won't work
1177 at all). If in doubt say Y.
1179 config ARCH_HAS_HOLES_MEMORYMODEL
1182 # Discontigmem is deprecated
1183 config ARCH_DISCONTIGMEM_ENABLE
1186 config ARCH_SPARSEMEM_ENABLE
1189 config ARCH_SPARSEMEM_DEFAULT
1190 def_bool ARCH_SPARSEMEM_ENABLE
1192 config ARCH_SELECT_MEMORY_MODEL
1193 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1197 default "4" if ARCH_LH7A40X
1199 depends on NEED_MULTIPLE_NODES
1202 bool "High Memory Support (EXPERIMENTAL)"
1203 depends on MMU && EXPERIMENTAL
1205 The address space of ARM processors is only 4 Gigabytes large
1206 and it has to accommodate user address space, kernel address
1207 space as well as some memory mapped IO. That means that, if you
1208 have a large amount of physical memory and/or IO, not all of the
1209 memory can be "permanently mapped" by the kernel. The physical
1210 memory that is not permanently mapped is called "high memory".
1212 Depending on the selected kernel/user memory split, minimum
1213 vmalloc space and actual amount of RAM, you may not need this
1214 option which should result in a slightly faster kernel.
1219 bool "Allocate 2nd-level pagetables from highmem"
1221 depends on !OUTER_CACHE
1226 bool "Timer and CPU usage LEDs"
1227 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1228 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1229 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1230 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1231 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1232 ARCH_AT91 || ARCH_DAVINCI || \
1233 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1235 If you say Y here, the LEDs on your machine will be used
1236 to provide useful information about your current system status.
1238 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1239 be able to select which LEDs are active using the options below. If
1240 you are compiling a kernel for the EBSA-110 or the LART however, the
1241 red LED will simply flash regularly to indicate that the system is
1242 still functional. It is safe to say Y here if you have a CATS
1243 system, but the driver will do nothing.
1246 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1247 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1248 || MACH_OMAP_PERSEUS2
1250 depends on !GENERIC_CLOCKEVENTS
1251 default y if ARCH_EBSA110
1253 If you say Y here, one of the system LEDs (the green one on the
1254 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1255 will flash regularly to indicate that the system is still
1256 operational. This is mainly useful to kernel hackers who are
1257 debugging unstable kernels.
1259 The LART uses the same LED for both Timer LED and CPU usage LED
1260 functions. You may choose to use both, but the Timer LED function
1261 will overrule the CPU usage LED.
1264 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1266 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1267 || MACH_OMAP_PERSEUS2
1270 If you say Y here, the red LED will be used to give a good real
1271 time indication of CPU usage, by lighting whenever the idle task
1272 is not currently executing.
1274 The LART uses the same LED for both Timer LED and CPU usage LED
1275 functions. You may choose to use both, but the Timer LED function
1276 will overrule the CPU usage LED.
1278 config ALIGNMENT_TRAP
1280 depends on CPU_CP15_MMU
1281 default y if !ARCH_EBSA110
1283 ARM processors cannot fetch/store information which is not
1284 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1285 address divisible by 4. On 32-bit ARM processors, these non-aligned
1286 fetch/store instructions will be emulated in software if you say
1287 here, which has a severe performance impact. This is necessary for
1288 correct operation of some network protocols. With an IP-only
1289 configuration it is safe to say N, otherwise say Y.
1291 config UACCESS_WITH_MEMCPY
1292 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1293 depends on MMU && EXPERIMENTAL
1294 default y if CPU_FEROCEON
1296 Implement faster copy_to_user and clear_user methods for CPU
1297 cores where a 8-word STM instruction give significantly higher
1298 memory write throughput than a sequence of individual 32bit stores.
1300 A possible side effect is a slight increase in scheduling latency
1301 between threads sharing the same address space if they invoke
1302 such copy operations with large buffers.
1304 However, if the CPU data cache is using a write-allocate mode,
1305 this option is unlikely to provide any performance gain.
1311 # Compressed boot loader in ROM. Yes, we really want to ask about
1312 # TEXT and BSS so we preserve their values in the config files.
1313 config ZBOOT_ROM_TEXT
1314 hex "Compressed ROM boot loader base address"
1317 The physical address at which the ROM-able zImage is to be
1318 placed in the target. Platforms which normally make use of
1319 ROM-able zImage formats normally set this to a suitable
1320 value in their defconfig file.
1322 If ZBOOT_ROM is not enabled, this has no effect.
1324 config ZBOOT_ROM_BSS
1325 hex "Compressed ROM boot loader BSS address"
1328 The base address of an area of read/write memory in the target
1329 for the ROM-able zImage which must be available while the
1330 decompressor is running. It must be large enough to hold the
1331 entire decompressed kernel plus an additional 128 KiB.
1332 Platforms which normally make use of ROM-able zImage formats
1333 normally set this to a suitable value in their defconfig file.
1335 If ZBOOT_ROM is not enabled, this has no effect.
1338 bool "Compressed boot loader in ROM/flash"
1339 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1341 Say Y here if you intend to execute your compressed kernel image
1342 (zImage) directly from ROM or flash. If unsure, say N.
1345 string "Default kernel command string"
1348 On some architectures (EBSA110 and CATS), there is currently no way
1349 for the boot loader to pass arguments to the kernel. For these
1350 architectures, you should supply some command-line options at build
1351 time by entering them here. As a minimum, you should specify the
1352 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1355 bool "Kernel Execute-In-Place from ROM"
1356 depends on !ZBOOT_ROM
1358 Execute-In-Place allows the kernel to run from non-volatile storage
1359 directly addressable by the CPU, such as NOR flash. This saves RAM
1360 space since the text section of the kernel is not loaded from flash
1361 to RAM. Read-write sections, such as the data section and stack,
1362 are still copied to RAM. The XIP kernel is not compressed since
1363 it has to run directly from flash, so it will take more space to
1364 store it. The flash address used to link the kernel object files,
1365 and for storing it, is configuration dependent. Therefore, if you
1366 say Y here, you must know the proper physical address where to
1367 store the kernel image depending on your own flash memory usage.
1369 Also note that the make target becomes "make xipImage" rather than
1370 "make zImage" or "make Image". The final kernel binary to put in
1371 ROM memory will be arch/arm/boot/xipImage.
1375 config XIP_PHYS_ADDR
1376 hex "XIP Kernel Physical Location"
1377 depends on XIP_KERNEL
1378 default "0x00080000"
1380 This is the physical address in your flash memory the kernel will
1381 be linked for and stored to. This address is dependent on your
1385 bool "Kexec system call (EXPERIMENTAL)"
1386 depends on EXPERIMENTAL
1388 kexec is a system call that implements the ability to shutdown your
1389 current kernel, and to start another kernel. It is like a reboot
1390 but it is independent of the system firmware. And like a reboot
1391 you can start any kernel with it, not just Linux.
1393 It is an ongoing process to be certain the hardware in a machine
1394 is properly shutdown, so do not be surprised if this code does not
1395 initially work for you. It may help to enable device hotplugging
1399 bool "Export atags in procfs"
1403 Should the atags used to boot the kernel be exported in an "atags"
1404 file in procfs. Useful with kexec.
1408 menu "CPU Power Management"
1412 source "drivers/cpufreq/Kconfig"
1414 config CPU_FREQ_SA1100
1417 config CPU_FREQ_SA1110
1420 config CPU_FREQ_INTEGRATOR
1421 tristate "CPUfreq driver for ARM Integrator CPUs"
1422 depends on ARCH_INTEGRATOR && CPU_FREQ
1425 This enables the CPUfreq driver for ARM Integrator CPUs.
1427 For details, take a look at <file:Documentation/cpu-freq>.
1433 depends on CPU_FREQ && ARCH_PXA && PXA25x
1435 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1437 config CPU_FREQ_S3C64XX
1438 bool "CPUfreq support for Samsung S3C64XX CPUs"
1439 depends on CPU_FREQ && CPU_S3C6410
1444 Internal configuration node for common cpufreq on Samsung SoC
1446 config CPU_FREQ_S3C24XX
1447 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1448 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1451 This enables the CPUfreq driver for the Samsung S3C24XX family
1454 For details, take a look at <file:Documentation/cpu-freq>.
1458 config CPU_FREQ_S3C24XX_PLL
1459 bool "Support CPUfreq changing of PLL frequency"
1460 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1462 Compile in support for changing the PLL frequency from the
1463 S3C24XX series CPUfreq driver. The PLL takes time to settle
1464 after a frequency change, so by default it is not enabled.
1466 This also means that the PLL tables for the selected CPU(s) will
1467 be built which may increase the size of the kernel image.
1469 config CPU_FREQ_S3C24XX_DEBUG
1470 bool "Debug CPUfreq Samsung driver core"
1471 depends on CPU_FREQ_S3C24XX
1473 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1475 config CPU_FREQ_S3C24XX_IODEBUG
1476 bool "Debug CPUfreq Samsung driver IO timing"
1477 depends on CPU_FREQ_S3C24XX
1479 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1481 config CPU_FREQ_S3C24XX_DEBUGFS
1482 bool "Export debugfs for CPUFreq"
1483 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1485 Export status information via debugfs.
1489 source "drivers/cpuidle/Kconfig"
1493 menu "Floating point emulation"
1495 comment "At least one emulation must be selected"
1498 bool "NWFPE math emulation"
1499 depends on !AEABI || OABI_COMPAT
1501 Say Y to include the NWFPE floating point emulator in the kernel.
1502 This is necessary to run most binaries. Linux does not currently
1503 support floating point hardware so you need to say Y here even if
1504 your machine has an FPA or floating point co-processor podule.
1506 You may say N here if you are going to load the Acorn FPEmulator
1507 early in the bootup.
1510 bool "Support extended precision"
1511 depends on FPE_NWFPE
1513 Say Y to include 80-bit support in the kernel floating-point
1514 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1515 Note that gcc does not generate 80-bit operations by default,
1516 so in most cases this option only enlarges the size of the
1517 floating point emulator without any good reason.
1519 You almost surely want to say N here.
1522 bool "FastFPE math emulation (EXPERIMENTAL)"
1523 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1525 Say Y here to include the FAST floating point emulator in the kernel.
1526 This is an experimental much faster emulator which now also has full
1527 precision for the mantissa. It does not support any exceptions.
1528 It is very simple, and approximately 3-6 times faster than NWFPE.
1530 It should be sufficient for most programs. It may be not suitable
1531 for scientific calculations, but you have to check this for yourself.
1532 If you do not feel you need a faster FP emulation you should better
1536 bool "VFP-format floating point maths"
1537 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1539 Say Y to include VFP support code in the kernel. This is needed
1540 if your hardware includes a VFP unit.
1542 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1543 release notes and additional status information.
1545 Say N if your target does not have VFP hardware.
1553 bool "Advanced SIMD (NEON) Extension support"
1554 depends on VFPv3 && CPU_V7
1556 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1561 menu "Userspace binary formats"
1563 source "fs/Kconfig.binfmt"
1566 tristate "RISC OS personality"
1569 Say Y here to include the kernel code necessary if you want to run
1570 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1571 experimental; if this sounds frightening, say N and sleep in peace.
1572 You can also say M here to compile this support as a module (which
1573 will be called arthur).
1577 menu "Power management options"
1579 source "kernel/power/Kconfig"
1581 config ARCH_SUSPEND_POSSIBLE
1586 source "net/Kconfig"
1588 source "drivers/Kconfig"
1592 source "arch/arm/Kconfig.debug"
1594 source "security/Kconfig"
1596 source "crypto/Kconfig"
1598 source "lib/Kconfig"