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
15 select GENERIC_ATOMIC64 if (!CPU_32v6K)
18 select HAVE_KPROBES if (!XIP_KERNEL)
19 select HAVE_KRETPROBES if (HAVE_KPROBES)
20 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
21 select HAVE_GENERIC_DMA_COHERENT
22 select HAVE_KERNEL_GZIP
23 select HAVE_KERNEL_LZO
24 select HAVE_PERF_EVENTS
25 select PERF_USE_VMALLOC
27 The ARM series is a line of low-power-consumption RISC chip designs
28 licensed by ARM Ltd and targeted at embedded applications and
29 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
30 manufactured, but legacy ARM-based PC hardware remains popular in
31 Europe. There is an ARM Linux project with a web page at
32 <http://www.arm.linux.org.uk/>.
37 config SYS_SUPPORTS_APM_EMULATION
46 config GENERIC_CLOCKEVENTS
49 config GENERIC_CLOCKEVENTS_BROADCAST
51 depends on GENERIC_CLOCKEVENTS
52 default y if SMP && !LOCAL_TIMERS
56 select GENERIC_ALLOCATOR
67 The Extended Industry Standard Architecture (EISA) bus was
68 developed as an open alternative to the IBM MicroChannel bus.
70 The EISA bus provided some of the features of the IBM MicroChannel
71 bus while maintaining backward compatibility with cards made for
72 the older ISA bus. The EISA bus saw limited use between 1988 and
73 1995 when it was made obsolete by the PCI bus.
75 Say Y here if you are building a kernel for an EISA-based machine.
85 MicroChannel Architecture is found in some IBM PS/2 machines and
86 laptops. It is a bus system similar to PCI or ISA. See
87 <file:Documentation/mca.txt> (and especially the web page given
88 there) before attempting to build an MCA bus kernel.
90 config GENERIC_HARDIRQS
94 config STACKTRACE_SUPPORT
98 config HAVE_LATENCYTOP_SUPPORT
103 config LOCKDEP_SUPPORT
107 config TRACE_IRQFLAGS_SUPPORT
111 config HARDIRQS_SW_RESEND
115 config GENERIC_IRQ_PROBE
119 config GENERIC_LOCKBREAK
122 depends on SMP && PREEMPT
124 config RWSEM_GENERIC_SPINLOCK
128 config RWSEM_XCHGADD_ALGORITHM
131 config ARCH_HAS_ILOG2_U32
134 config ARCH_HAS_ILOG2_U64
137 config ARCH_HAS_CPUFREQ
140 Internal node to signify that the ARCH has CPUFREQ support
141 and that the relevant menu configurations are displayed for
144 config GENERIC_HWEIGHT
148 config GENERIC_CALIBRATE_DELAY
152 config ARCH_MAY_HAVE_PC_FDC
158 config NEED_DMA_MAP_STATE
161 config GENERIC_ISA_DMA
170 config GENERIC_HARDIRQS_NO__DO_IRQ
173 config ARM_L1_CACHE_SHIFT_6
176 Setting ARM L1 cache line size to 64 Bytes.
180 config OPROFILE_ARMV6
182 depends on CPU_V6 && !SMP
183 select OPROFILE_ARM11_CORE
185 config OPROFILE_MPCORE
187 depends on CPU_V6 && SMP
188 select OPROFILE_ARM11_CORE
190 config OPROFILE_ARM11_CORE
193 config OPROFILE_ARMV7
195 depends on CPU_V7 && !SMP
202 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
203 default DRAM_BASE if REMAP_VECTORS_TO_RAM
206 The base address of exception vectors.
208 source "init/Kconfig"
210 source "kernel/Kconfig.freezer"
215 bool "MMU-based Paged Memory Management Support"
218 Select if you want MMU-based virtualised addressing space
219 support by paged memory management. If unsure, say 'Y'.
222 prompt "ARM system type"
223 default ARCH_VERSATILE
226 bool "Agilent AAEC-2000 based"
231 This enables support for systems based on the Agilent AAEC-2000
233 config ARCH_INTEGRATOR
234 bool "ARM Ltd. Integrator family"
236 select ARCH_HAS_CPUFREQ
241 Support for ARM's Integrator platform.
244 bool "ARM Ltd. RealView family"
250 select GENERIC_CLOCKEVENTS
251 select ARCH_WANT_OPTIONAL_GPIOLIB
253 This enables support for ARM Ltd RealView boards.
255 config ARCH_VERSATILE
256 bool "ARM Ltd. Versatile family"
263 select GENERIC_CLOCKEVENTS
264 select ARCH_WANT_OPTIONAL_GPIOLIB
266 This enables support for ARM Ltd Versatile board.
271 select ARCH_REQUIRE_GPIOLIB
274 This enables support for systems based on the Atmel AT91RM9200,
275 AT91SAM9 and AT91CAP9 processors.
278 bool "Cirrus Logic CLPS711x/EP721x-based"
281 Support for Cirrus Logic 711x/721x based boards.
284 bool "Cortina Systems Gemini"
287 select ARCH_REQUIRE_GPIOLIB
289 Support for the Cortina Systems Gemini family SoCs
297 This is an evaluation board for the StrongARM processor available
298 from Digital. It has limited hardware on-board, including an
299 Ethernet interface, two PCMCIA sockets, two serial ports and a
310 select ARCH_REQUIRE_GPIOLIB
311 select ARCH_HAS_HOLES_MEMORYMODEL
313 This enables support for the Cirrus EP93xx series of CPUs.
315 config ARCH_FOOTBRIDGE
320 Support for systems based on the DC21285 companion chip
321 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
324 bool "Freescale MXC/iMX-based"
326 select GENERIC_CLOCKEVENTS
327 select ARCH_REQUIRE_GPIOLIB
331 Support for Freescale MXC/iMX-based family of processors
334 bool "Freescale STMP3xxx"
338 select ARCH_REQUIRE_GPIOLIB
340 select GENERIC_CLOCKEVENTS
342 select USB_ARCH_HAS_EHCI
344 Support for systems based on the Freescale 3xxx CPUs.
347 bool "Hilscher NetX based"
350 select GENERIC_CLOCKEVENTS
353 This enables support for systems based on the Hilscher NetX Soc
356 bool "Hynix HMS720x-based"
360 This enables support for systems based on the Hynix HMS720x
363 bool "STMicroelectronics Nomadik"
370 select GENERIC_CLOCKEVENTS
372 select ARCH_REQUIRE_GPIOLIB
374 Support for the Nomadik platform by ST-Ericsson
382 select ARCH_SUPPORTS_MSI
385 Support for Intel's IOP13XX (XScale) family of processors.
394 select ARCH_REQUIRE_GPIOLIB
396 Support for Intel's 80219 and IOP32X (XScale) family of
406 select ARCH_REQUIRE_GPIOLIB
408 Support for Intel's IOP33X (XScale) family of processors.
416 Support for Intel's IXP23xx (XScale) family of processors.
419 bool "IXP2400/2800-based"
424 Support for Intel's IXP2400/2800 (XScale) family of processors.
432 select GENERIC_CLOCKEVENTS
433 select DMABOUNCE if PCI
435 Support for Intel's IXP4XX (XScale) family of processors.
442 Say Y here if you intend to run this kernel on a LinkUp Systems
443 L7200 Software Development Board which uses an ARM720T processor.
444 Information on this board can be obtained at:
446 <http://www.linkupsys.com/>
448 If you have any questions or comments about the Linux kernel port
449 to this board, send e-mail to <sjhill@cotw.com>.
455 select ARCH_REQUIRE_GPIOLIB
457 select GENERIC_CLOCKEVENTS
460 Support for the Marvell Dove SoC 88AP510
463 bool "Marvell Kirkwood"
467 select ARCH_REQUIRE_GPIOLIB
469 select GENERIC_CLOCKEVENTS
472 Support for the following Marvell Kirkwood series SoCs:
473 88F6180, 88F6192 and 88F6281.
476 bool "Marvell Loki (88RC8480)"
479 select GENERIC_CLOCKEVENTS
482 Support for the Marvell Loki (88RC8480) SoC.
485 bool "Marvell MV78xx0"
489 select ARCH_REQUIRE_GPIOLIB
491 select GENERIC_CLOCKEVENTS
494 Support for the following Marvell MV78xx0 series SoCs:
503 select ARCH_REQUIRE_GPIOLIB
505 select GENERIC_CLOCKEVENTS
508 Support for the following Marvell Orion 5x series SoCs:
509 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
510 Orion-2 (5281), Orion-1-90 (6183).
513 bool "Marvell PXA168/910/MMP2"
516 select ARCH_REQUIRE_GPIOLIB
520 select GENERIC_CLOCKEVENTS
524 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
527 bool "Micrel/Kendin KS8695"
530 select ARCH_REQUIRE_GPIOLIB
532 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
533 System-on-Chip devices.
536 bool "NetSilicon NS9xxx"
540 select GENERIC_CLOCKEVENTS
543 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
546 <http://www.digi.com/products/microprocessors/index.jsp>
549 bool "Nuvoton W90X900 CPU"
551 select ARCH_REQUIRE_GPIOLIB
556 select GENERIC_CLOCKEVENTS
558 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
559 At present, the w90x900 has been renamed nuc900, regarding
560 the ARM series product line, you can login the following
561 link address to know more.
563 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
564 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
567 bool "Nuvoton NUC93X CPU"
572 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
573 low-power and high performance MPEG-4/JPEG multimedia controller chip.
576 bool "Philips Nexperia PNX4008 Mobile"
581 This enables support for Philips PNX4008 mobile platform.
584 bool "PXA2xx/PXA3xx-based"
587 select ARCH_HAS_CPUFREQ
591 select ARCH_REQUIRE_GPIOLIB
593 select GENERIC_CLOCKEVENTS
597 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
603 select GENERIC_CLOCKEVENTS
605 Support for Qualcomm MSM7K based systems. This runs on the ARM11
606 apps processor of the MSM7K and depends on a shared memory
607 interface to the ARM9 modem processor which runs the baseband stack
608 and controls some vital subsystems (clock and power control, etc).
611 bool "Renesas SH-Mobile"
613 Support for Renesas's SH-Mobile ARM platforms
620 select ARCH_MAY_HAVE_PC_FDC
621 select HAVE_PATA_PLATFORM
624 select ARCH_SPARSEMEM_ENABLE
626 On the Acorn Risc-PC, Linux can support the internal IDE disk and
627 CD-ROM interface, serial and parallel port, and the floppy drive.
633 select ARCH_SPARSEMEM_ENABLE
635 select ARCH_HAS_CPUFREQ
639 select GENERIC_CLOCKEVENTS
642 select ARCH_REQUIRE_GPIOLIB
644 Support for StrongARM 11x0 based boards.
647 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
649 select ARCH_HAS_CPUFREQ
652 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
653 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
654 the Samsung SMDK2410 development board (and derivatives).
657 bool "Samsung S3C64XX"
664 select ARCH_HAS_CPUFREQ
665 select ARCH_REQUIRE_GPIOLIB
666 select SAMSUNG_CLKSRC
667 select SAMSUNG_IRQ_VIC_TIMER
668 select SAMSUNG_IRQ_UART
669 select S3C_GPIO_TRACK
670 select S3C_GPIO_PULL_UPDOWN
671 select S3C_GPIO_CFG_S3C24XX
672 select S3C_GPIO_CFG_S3C64XX
674 select USB_ARCH_HAS_OHCI
675 select SAMSUNG_GPIOLIB_4BIT
677 Samsung S3C64XX series based systems
680 bool "Samsung S5P6440"
685 Samsung S5P6440 CPU based systems
688 bool "Samsung S5P6442"
693 Samsung S5P6442 CPU based systems
696 bool "Samsung S5PC1XX"
700 select ARM_L1_CACHE_SHIFT_6
702 Samsung S5PC1XX series based systems
705 bool "Samsung S5PV210/S5PC110"
709 select ARM_L1_CACHE_SHIFT_6
711 Samsung S5PV210/S5PC110 series based systems
721 Support for the StrongARM based Digital DNARD machine, also known
722 as "Shark" (<http://www.shark-linux.de/shark.html>).
727 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
728 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
730 Say Y here for systems based on one of the Sharp LH7A40X
731 System on a Chip processors. These CPUs include an ARM922T
732 core with a wide array of integrated devices for
733 hand-held and low-power applications.
736 bool "ST-Ericsson U300 Series"
743 select GENERIC_CLOCKEVENTS
748 Support for ST-Ericsson U300 series mobile platforms.
754 select GENERIC_CLOCKEVENTS
756 select ARCH_REQUIRE_GPIOLIB
761 select GENERIC_ALLOCATOR
762 select ARCH_HAS_HOLES_MEMORYMODEL
764 Support for TI's DaVinci platform.
770 select ARCH_REQUIRE_GPIOLIB
771 select ARCH_HAS_CPUFREQ
773 select GENERIC_CLOCKEVENTS
774 select ARCH_HAS_HOLES_MEMORYMODEL
776 Support for TI's OMAP platform (OMAP1 and OMAP2).
779 bool "Broadcom BCMRING"
785 select GENERIC_CLOCKEVENTS
786 select ARCH_WANT_OPTIONAL_GPIOLIB
788 Support for Broadcom's BCMRing platform.
791 bool "ST-Ericsson U8500 Series"
795 select GENERIC_CLOCKEVENTS
798 Support for ST-Ericsson's Ux500 architecture
802 source "arch/arm/mach-aaec2000/Kconfig"
804 source "arch/arm/mach-at91/Kconfig"
806 source "arch/arm/mach-bcmring/Kconfig"
808 source "arch/arm/mach-clps711x/Kconfig"
810 source "arch/arm/mach-davinci/Kconfig"
812 source "arch/arm/mach-dove/Kconfig"
814 source "arch/arm/mach-ep93xx/Kconfig"
816 source "arch/arm/mach-footbridge/Kconfig"
818 source "arch/arm/mach-gemini/Kconfig"
820 source "arch/arm/mach-h720x/Kconfig"
822 source "arch/arm/mach-integrator/Kconfig"
824 source "arch/arm/mach-iop32x/Kconfig"
826 source "arch/arm/mach-iop33x/Kconfig"
828 source "arch/arm/mach-iop13xx/Kconfig"
830 source "arch/arm/mach-ixp4xx/Kconfig"
832 source "arch/arm/mach-ixp2000/Kconfig"
834 source "arch/arm/mach-ixp23xx/Kconfig"
836 source "arch/arm/mach-kirkwood/Kconfig"
838 source "arch/arm/mach-ks8695/Kconfig"
840 source "arch/arm/mach-lh7a40x/Kconfig"
842 source "arch/arm/mach-loki/Kconfig"
844 source "arch/arm/mach-msm/Kconfig"
846 source "arch/arm/mach-mv78xx0/Kconfig"
848 source "arch/arm/plat-mxc/Kconfig"
850 source "arch/arm/mach-netx/Kconfig"
852 source "arch/arm/mach-nomadik/Kconfig"
853 source "arch/arm/plat-nomadik/Kconfig"
855 source "arch/arm/mach-ns9xxx/Kconfig"
857 source "arch/arm/mach-nuc93x/Kconfig"
859 source "arch/arm/plat-omap/Kconfig"
861 source "arch/arm/mach-omap1/Kconfig"
863 source "arch/arm/mach-omap2/Kconfig"
865 source "arch/arm/mach-orion5x/Kconfig"
867 source "arch/arm/mach-pxa/Kconfig"
868 source "arch/arm/plat-pxa/Kconfig"
870 source "arch/arm/mach-mmp/Kconfig"
872 source "arch/arm/mach-realview/Kconfig"
874 source "arch/arm/mach-sa1100/Kconfig"
876 source "arch/arm/plat-samsung/Kconfig"
877 source "arch/arm/plat-s3c24xx/Kconfig"
878 source "arch/arm/plat-s5p/Kconfig"
879 source "arch/arm/plat-s5pc1xx/Kconfig"
882 source "arch/arm/mach-s3c2400/Kconfig"
883 source "arch/arm/mach-s3c2410/Kconfig"
884 source "arch/arm/mach-s3c2412/Kconfig"
885 source "arch/arm/mach-s3c2440/Kconfig"
886 source "arch/arm/mach-s3c2443/Kconfig"
890 source "arch/arm/mach-s3c64xx/Kconfig"
893 source "arch/arm/mach-s5p6440/Kconfig"
895 source "arch/arm/mach-s5p6442/Kconfig"
898 source "arch/arm/mach-s5pc100/Kconfig"
901 source "arch/arm/mach-s5pv210/Kconfig"
903 source "arch/arm/mach-shmobile/Kconfig"
905 source "arch/arm/plat-stmp3xxx/Kconfig"
907 source "arch/arm/mach-u300/Kconfig"
909 source "arch/arm/mach-ux500/Kconfig"
911 source "arch/arm/mach-versatile/Kconfig"
913 source "arch/arm/mach-w90x900/Kconfig"
915 # Definitions to make life easier
921 select GENERIC_CLOCKEVENTS
930 source arch/arm/mm/Kconfig
933 bool "Enable iWMMXt support"
934 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
935 default y if PXA27x || PXA3xx || ARCH_MMP
937 Enable support for iWMMXt context switching at run time if
938 running on a CPU that supports it.
940 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
943 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
947 depends on CPU_V6 || CPU_V7 || XSCALE_PMU
952 source "arch/arm/Kconfig-nommu"
955 config ARM_ERRATA_411920
956 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
957 depends on CPU_V6 && !SMP
959 Invalidation of the Instruction Cache operation can
960 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
961 It does not affect the MPCore. This option enables the ARM Ltd.
962 recommended workaround.
964 config ARM_ERRATA_430973
965 bool "ARM errata: Stale prediction on replaced interworking branch"
968 This option enables the workaround for the 430973 Cortex-A8
969 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
970 interworking branch is replaced with another code sequence at the
971 same virtual address, whether due to self-modifying code or virtual
972 to physical address re-mapping, Cortex-A8 does not recover from the
973 stale interworking branch prediction. This results in Cortex-A8
974 executing the new code sequence in the incorrect ARM or Thumb state.
975 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
976 and also flushes the branch target cache at every context switch.
977 Note that setting specific bits in the ACTLR register may not be
978 available in non-secure mode.
980 config ARM_ERRATA_458693
981 bool "ARM errata: Processor deadlock when a false hazard is created"
984 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
985 erratum. For very specific sequences of memory operations, it is
986 possible for a hazard condition intended for a cache line to instead
987 be incorrectly associated with a different cache line. This false
988 hazard might then cause a processor deadlock. The workaround enables
989 the L1 caching of the NEON accesses and disables the PLD instruction
990 in the ACTLR register. Note that setting specific bits in the ACTLR
991 register may not be available in non-secure mode.
993 config ARM_ERRATA_460075
994 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
997 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
998 erratum. Any asynchronous access to the L2 cache may encounter a
999 situation in which recent store transactions to the L2 cache are lost
1000 and overwritten with stale memory contents from external memory. The
1001 workaround disables the write-allocate mode for the L2 cache via the
1002 ACTLR register. Note that setting specific bits in the ACTLR register
1003 may not be available in non-secure mode.
1005 config PL310_ERRATA_588369
1006 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1007 depends on CACHE_L2X0 && ARCH_OMAP4
1009 The PL310 L2 cache controller implements three types of Clean &
1010 Invalidate maintenance operations: by Physical Address
1011 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1012 They are architecturally defined to behave as the execution of a
1013 clean operation followed immediately by an invalidate operation,
1014 both performing to the same memory location. This functionality
1015 is not correctly implemented in PL310 as clean lines are not
1016 invalidated as a result of these operations. Note that this errata
1017 uses Texas Instrument's secure monitor api.
1020 source "arch/arm/common/Kconfig"
1022 config FORCE_MAX_ZONEORDER
1035 Find out whether you have ISA slots on your motherboard. ISA is the
1036 name of a bus system, i.e. the way the CPU talks to the other stuff
1037 inside your box. Other bus systems are PCI, EISA, MicroChannel
1038 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1039 newer boards don't support it. If you have ISA, say Y, otherwise N.
1041 # Select ISA DMA controller support
1046 # Select ISA DMA interface
1051 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1053 Find out whether you have a PCI motherboard. PCI is the name of a
1054 bus system, i.e. the way the CPU talks to the other stuff inside
1055 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1056 VESA. If you have PCI, say Y, otherwise N.
1061 # Select the host bridge type
1062 config PCI_HOST_VIA82C505
1064 depends on PCI && ARCH_SHARK
1067 config PCI_HOST_ITE8152
1069 depends on PCI && MACH_ARMCORE
1073 source "drivers/pci/Kconfig"
1075 source "drivers/pcmcia/Kconfig"
1079 menu "Kernel Features"
1081 source "kernel/time/Kconfig"
1084 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1085 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1086 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1087 depends on GENERIC_CLOCKEVENTS
1088 select USE_GENERIC_SMP_HELPERS
1089 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1091 This enables support for systems with more than one CPU. If you have
1092 a system with only one CPU, like most personal computers, say N. If
1093 you have a system with more than one CPU, say Y.
1095 If you say N here, the kernel will run on single and multiprocessor
1096 machines, but will use only one CPU of a multiprocessor machine. If
1097 you say Y here, the kernel will run on many, but not all, single
1098 processor machines. On a single processor machine, the kernel will
1099 run faster if you say N here.
1101 See also <file:Documentation/i386/IO-APIC.txt>,
1102 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1103 <http://www.linuxdoc.org/docs.html#howto>.
1105 If you don't know what to do here, say N.
1111 This option enables support for the ARM system coherency unit
1117 This options enables support for the ARM timer and watchdog unit
1120 prompt "Memory split"
1123 Select the desired split between kernel and user memory.
1125 If you are not absolutely sure what you are doing, leave this
1129 bool "3G/1G user/kernel split"
1131 bool "2G/2G user/kernel split"
1133 bool "1G/3G user/kernel split"
1138 default 0x40000000 if VMSPLIT_1G
1139 default 0x80000000 if VMSPLIT_2G
1143 int "Maximum number of CPUs (2-32)"
1149 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1150 depends on SMP && HOTPLUG && EXPERIMENTAL
1152 Say Y here to experiment with turning CPUs off and on. CPUs
1153 can be controlled through /sys/devices/system/cpu.
1156 bool "Use local timer interrupts"
1157 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1158 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1160 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1162 Enable support for local timers on SMP platforms, rather then the
1163 legacy IPI broadcast method. Local timers allows the system
1164 accounting to be spread across the timer interval, preventing a
1165 "thundering herd" at every timer tick.
1167 source kernel/Kconfig.preempt
1171 default 128 if ARCH_L7200
1172 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1173 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1174 default AT91_TIMER_HZ if ARCH_AT91
1177 config THUMB2_KERNEL
1178 bool "Compile the kernel in Thumb-2 mode"
1179 depends on CPU_V7 && EXPERIMENTAL
1181 select ARM_ASM_UNIFIED
1183 By enabling this option, the kernel will be compiled in
1184 Thumb-2 mode. A compiler/assembler that understand the unified
1185 ARM-Thumb syntax is needed.
1189 config ARM_ASM_UNIFIED
1193 bool "Use the ARM EABI to compile the kernel"
1195 This option allows for the kernel to be compiled using the latest
1196 ARM ABI (aka EABI). This is only useful if you are using a user
1197 space environment that is also compiled with EABI.
1199 Since there are major incompatibilities between the legacy ABI and
1200 EABI, especially with regard to structure member alignment, this
1201 option also changes the kernel syscall calling convention to
1202 disambiguate both ABIs and allow for backward compatibility support
1203 (selected with CONFIG_OABI_COMPAT).
1205 To use this you need GCC version 4.0.0 or later.
1208 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1209 depends on AEABI && EXPERIMENTAL
1212 This option preserves the old syscall interface along with the
1213 new (ARM EABI) one. It also provides a compatibility layer to
1214 intercept syscalls that have structure arguments which layout
1215 in memory differs between the legacy ABI and the new ARM EABI
1216 (only for non "thumb" binaries). This option adds a tiny
1217 overhead to all syscalls and produces a slightly larger kernel.
1218 If you know you'll be using only pure EABI user space then you
1219 can say N here. If this option is not selected and you attempt
1220 to execute a legacy ABI binary then the result will be
1221 UNPREDICTABLE (in fact it can be predicted that it won't work
1222 at all). If in doubt say Y.
1224 config ARCH_HAS_HOLES_MEMORYMODEL
1227 # Discontigmem is deprecated
1228 config ARCH_DISCONTIGMEM_ENABLE
1231 config ARCH_SPARSEMEM_ENABLE
1234 config ARCH_SPARSEMEM_DEFAULT
1235 def_bool ARCH_SPARSEMEM_ENABLE
1237 config ARCH_SELECT_MEMORY_MODEL
1238 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1242 default "4" if ARCH_LH7A40X
1244 depends on NEED_MULTIPLE_NODES
1247 bool "High Memory Support (EXPERIMENTAL)"
1248 depends on MMU && EXPERIMENTAL
1250 The address space of ARM processors is only 4 Gigabytes large
1251 and it has to accommodate user address space, kernel address
1252 space as well as some memory mapped IO. That means that, if you
1253 have a large amount of physical memory and/or IO, not all of the
1254 memory can be "permanently mapped" by the kernel. The physical
1255 memory that is not permanently mapped is called "high memory".
1257 Depending on the selected kernel/user memory split, minimum
1258 vmalloc space and actual amount of RAM, you may not need this
1259 option which should result in a slightly faster kernel.
1264 bool "Allocate 2nd-level pagetables from highmem"
1266 depends on !OUTER_CACHE
1268 config HW_PERF_EVENTS
1269 bool "Enable hardware performance counter support for perf events"
1270 depends on PERF_EVENTS && CPU_HAS_PMU && (CPU_V6 || CPU_V7)
1273 Enable hardware performance counter support for perf events. If
1274 disabled, perf events will use software events only.
1279 bool "Timer and CPU usage LEDs"
1280 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1281 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1282 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1283 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1284 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1285 ARCH_AT91 || ARCH_DAVINCI || \
1286 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1288 If you say Y here, the LEDs on your machine will be used
1289 to provide useful information about your current system status.
1291 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1292 be able to select which LEDs are active using the options below. If
1293 you are compiling a kernel for the EBSA-110 or the LART however, the
1294 red LED will simply flash regularly to indicate that the system is
1295 still functional. It is safe to say Y here if you have a CATS
1296 system, but the driver will do nothing.
1299 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1300 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1301 || MACH_OMAP_PERSEUS2
1303 depends on !GENERIC_CLOCKEVENTS
1304 default y if ARCH_EBSA110
1306 If you say Y here, one of the system LEDs (the green one on the
1307 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1308 will flash regularly to indicate that the system is still
1309 operational. This is mainly useful to kernel hackers who are
1310 debugging unstable kernels.
1312 The LART uses the same LED for both Timer LED and CPU usage LED
1313 functions. You may choose to use both, but the Timer LED function
1314 will overrule the CPU usage LED.
1317 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1319 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1320 || MACH_OMAP_PERSEUS2
1323 If you say Y here, the red LED will be used to give a good real
1324 time indication of CPU usage, by lighting whenever the idle task
1325 is not currently executing.
1327 The LART uses the same LED for both Timer LED and CPU usage LED
1328 functions. You may choose to use both, but the Timer LED function
1329 will overrule the CPU usage LED.
1331 config ALIGNMENT_TRAP
1333 depends on CPU_CP15_MMU
1334 default y if !ARCH_EBSA110
1335 select HAVE_PROC_CPU if PROC_FS
1337 ARM processors cannot fetch/store information which is not
1338 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1339 address divisible by 4. On 32-bit ARM processors, these non-aligned
1340 fetch/store instructions will be emulated in software if you say
1341 here, which has a severe performance impact. This is necessary for
1342 correct operation of some network protocols. With an IP-only
1343 configuration it is safe to say N, otherwise say Y.
1345 config UACCESS_WITH_MEMCPY
1346 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1347 depends on MMU && EXPERIMENTAL
1348 default y if CPU_FEROCEON
1350 Implement faster copy_to_user and clear_user methods for CPU
1351 cores where a 8-word STM instruction give significantly higher
1352 memory write throughput than a sequence of individual 32bit stores.
1354 A possible side effect is a slight increase in scheduling latency
1355 between threads sharing the same address space if they invoke
1356 such copy operations with large buffers.
1358 However, if the CPU data cache is using a write-allocate mode,
1359 this option is unlikely to provide any performance gain.
1365 # Compressed boot loader in ROM. Yes, we really want to ask about
1366 # TEXT and BSS so we preserve their values in the config files.
1367 config ZBOOT_ROM_TEXT
1368 hex "Compressed ROM boot loader base address"
1371 The physical address at which the ROM-able zImage is to be
1372 placed in the target. Platforms which normally make use of
1373 ROM-able zImage formats normally set this to a suitable
1374 value in their defconfig file.
1376 If ZBOOT_ROM is not enabled, this has no effect.
1378 config ZBOOT_ROM_BSS
1379 hex "Compressed ROM boot loader BSS address"
1382 The base address of an area of read/write memory in the target
1383 for the ROM-able zImage which must be available while the
1384 decompressor is running. It must be large enough to hold the
1385 entire decompressed kernel plus an additional 128 KiB.
1386 Platforms which normally make use of ROM-able zImage formats
1387 normally set this to a suitable value in their defconfig file.
1389 If ZBOOT_ROM is not enabled, this has no effect.
1392 bool "Compressed boot loader in ROM/flash"
1393 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1395 Say Y here if you intend to execute your compressed kernel image
1396 (zImage) directly from ROM or flash. If unsure, say N.
1399 string "Default kernel command string"
1402 On some architectures (EBSA110 and CATS), there is currently no way
1403 for the boot loader to pass arguments to the kernel. For these
1404 architectures, you should supply some command-line options at build
1405 time by entering them here. As a minimum, you should specify the
1406 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1409 bool "Kernel Execute-In-Place from ROM"
1410 depends on !ZBOOT_ROM
1412 Execute-In-Place allows the kernel to run from non-volatile storage
1413 directly addressable by the CPU, such as NOR flash. This saves RAM
1414 space since the text section of the kernel is not loaded from flash
1415 to RAM. Read-write sections, such as the data section and stack,
1416 are still copied to RAM. The XIP kernel is not compressed since
1417 it has to run directly from flash, so it will take more space to
1418 store it. The flash address used to link the kernel object files,
1419 and for storing it, is configuration dependent. Therefore, if you
1420 say Y here, you must know the proper physical address where to
1421 store the kernel image depending on your own flash memory usage.
1423 Also note that the make target becomes "make xipImage" rather than
1424 "make zImage" or "make Image". The final kernel binary to put in
1425 ROM memory will be arch/arm/boot/xipImage.
1429 config XIP_PHYS_ADDR
1430 hex "XIP Kernel Physical Location"
1431 depends on XIP_KERNEL
1432 default "0x00080000"
1434 This is the physical address in your flash memory the kernel will
1435 be linked for and stored to. This address is dependent on your
1439 bool "Kexec system call (EXPERIMENTAL)"
1440 depends on EXPERIMENTAL
1442 kexec is a system call that implements the ability to shutdown your
1443 current kernel, and to start another kernel. It is like a reboot
1444 but it is independent of the system firmware. And like a reboot
1445 you can start any kernel with it, not just Linux.
1447 It is an ongoing process to be certain the hardware in a machine
1448 is properly shutdown, so do not be surprised if this code does not
1449 initially work for you. It may help to enable device hotplugging
1453 bool "Export atags in procfs"
1457 Should the atags used to boot the kernel be exported in an "atags"
1458 file in procfs. Useful with kexec.
1462 menu "CPU Power Management"
1466 source "drivers/cpufreq/Kconfig"
1468 config CPU_FREQ_SA1100
1471 config CPU_FREQ_SA1110
1474 config CPU_FREQ_INTEGRATOR
1475 tristate "CPUfreq driver for ARM Integrator CPUs"
1476 depends on ARCH_INTEGRATOR && CPU_FREQ
1479 This enables the CPUfreq driver for ARM Integrator CPUs.
1481 For details, take a look at <file:Documentation/cpu-freq>.
1487 depends on CPU_FREQ && ARCH_PXA && PXA25x
1489 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1491 config CPU_FREQ_S3C64XX
1492 bool "CPUfreq support for Samsung S3C64XX CPUs"
1493 depends on CPU_FREQ && CPU_S3C6410
1498 Internal configuration node for common cpufreq on Samsung SoC
1500 config CPU_FREQ_S3C24XX
1501 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1502 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1505 This enables the CPUfreq driver for the Samsung S3C24XX family
1508 For details, take a look at <file:Documentation/cpu-freq>.
1512 config CPU_FREQ_S3C24XX_PLL
1513 bool "Support CPUfreq changing of PLL frequency"
1514 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1516 Compile in support for changing the PLL frequency from the
1517 S3C24XX series CPUfreq driver. The PLL takes time to settle
1518 after a frequency change, so by default it is not enabled.
1520 This also means that the PLL tables for the selected CPU(s) will
1521 be built which may increase the size of the kernel image.
1523 config CPU_FREQ_S3C24XX_DEBUG
1524 bool "Debug CPUfreq Samsung driver core"
1525 depends on CPU_FREQ_S3C24XX
1527 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1529 config CPU_FREQ_S3C24XX_IODEBUG
1530 bool "Debug CPUfreq Samsung driver IO timing"
1531 depends on CPU_FREQ_S3C24XX
1533 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1535 config CPU_FREQ_S3C24XX_DEBUGFS
1536 bool "Export debugfs for CPUFreq"
1537 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1539 Export status information via debugfs.
1543 source "drivers/cpuidle/Kconfig"
1547 menu "Floating point emulation"
1549 comment "At least one emulation must be selected"
1552 bool "NWFPE math emulation"
1553 depends on !AEABI || OABI_COMPAT
1555 Say Y to include the NWFPE floating point emulator in the kernel.
1556 This is necessary to run most binaries. Linux does not currently
1557 support floating point hardware so you need to say Y here even if
1558 your machine has an FPA or floating point co-processor podule.
1560 You may say N here if you are going to load the Acorn FPEmulator
1561 early in the bootup.
1564 bool "Support extended precision"
1565 depends on FPE_NWFPE
1567 Say Y to include 80-bit support in the kernel floating-point
1568 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1569 Note that gcc does not generate 80-bit operations by default,
1570 so in most cases this option only enlarges the size of the
1571 floating point emulator without any good reason.
1573 You almost surely want to say N here.
1576 bool "FastFPE math emulation (EXPERIMENTAL)"
1577 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1579 Say Y here to include the FAST floating point emulator in the kernel.
1580 This is an experimental much faster emulator which now also has full
1581 precision for the mantissa. It does not support any exceptions.
1582 It is very simple, and approximately 3-6 times faster than NWFPE.
1584 It should be sufficient for most programs. It may be not suitable
1585 for scientific calculations, but you have to check this for yourself.
1586 If you do not feel you need a faster FP emulation you should better
1590 bool "VFP-format floating point maths"
1591 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1593 Say Y to include VFP support code in the kernel. This is needed
1594 if your hardware includes a VFP unit.
1596 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1597 release notes and additional status information.
1599 Say N if your target does not have VFP hardware.
1607 bool "Advanced SIMD (NEON) Extension support"
1608 depends on VFPv3 && CPU_V7
1610 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1615 menu "Userspace binary formats"
1617 source "fs/Kconfig.binfmt"
1620 tristate "RISC OS personality"
1623 Say Y here to include the kernel code necessary if you want to run
1624 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1625 experimental; if this sounds frightening, say N and sleep in peace.
1626 You can also say M here to compile this support as a module (which
1627 will be called arthur).
1631 menu "Power management options"
1633 source "kernel/power/Kconfig"
1635 config ARCH_SUSPEND_POSSIBLE
1640 source "net/Kconfig"
1642 source "drivers/Kconfig"
1646 source "arch/arm/Kconfig.debug"
1648 source "security/Kconfig"
1650 source "crypto/Kconfig"
1652 source "lib/Kconfig"