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 # The "ARM system type" choice list is ordered alphabetically by option
223 # text. Please add new entries in the option alphabetic order.
226 prompt "ARM system type"
227 default ARCH_VERSATILE
230 bool "Agilent AAEC-2000 based"
235 This enables support for systems based on the Agilent AAEC-2000
237 config ARCH_INTEGRATOR
238 bool "ARM Ltd. Integrator family"
240 select ARCH_HAS_CPUFREQ
245 Support for ARM's Integrator platform.
248 bool "ARM Ltd. RealView family"
254 select GENERIC_CLOCKEVENTS
255 select ARCH_WANT_OPTIONAL_GPIOLIB
256 select GPIO_PL061 if GPIOLIB
258 This enables support for ARM Ltd RealView boards.
260 config ARCH_VERSATILE
261 bool "ARM Ltd. Versatile family"
268 select GENERIC_CLOCKEVENTS
269 select ARCH_WANT_OPTIONAL_GPIOLIB
271 This enables support for ARM Ltd Versatile board.
276 select ARCH_REQUIRE_GPIOLIB
279 This enables support for systems based on the Atmel AT91RM9200,
280 AT91SAM9 and AT91CAP9 processors.
283 bool "Broadcom BCMRING"
289 select GENERIC_CLOCKEVENTS
290 select ARCH_WANT_OPTIONAL_GPIOLIB
292 Support for Broadcom's BCMRing platform.
295 bool "Cirrus Logic CLPS711x/EP721x-based"
298 Support for Cirrus Logic 711x/721x based boards.
301 bool "Cavium Networks CNS3XXX family"
304 select GENERIC_CLOCKEVENTS
307 Support for Cavium Networks CNS3XXX platform.
310 bool "Cortina Systems Gemini"
313 select ARCH_REQUIRE_GPIOLIB
315 Support for the Cortina Systems Gemini family SoCs
323 This is an evaluation board for the StrongARM processor available
324 from Digital. It has limited hardware on-board, including an
325 Ethernet interface, two PCMCIA sockets, two serial ports and a
336 select ARCH_REQUIRE_GPIOLIB
337 select ARCH_HAS_HOLES_MEMORYMODEL
339 This enables support for the Cirrus EP93xx series of CPUs.
341 config ARCH_FOOTBRIDGE
346 Support for systems based on the DC21285 companion chip
347 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
350 bool "Freescale MXC/iMX-based"
352 select GENERIC_CLOCKEVENTS
353 select ARCH_REQUIRE_GPIOLIB
357 Support for Freescale MXC/iMX-based family of processors
360 bool "Freescale STMP3xxx"
364 select ARCH_REQUIRE_GPIOLIB
366 select GENERIC_CLOCKEVENTS
368 select USB_ARCH_HAS_EHCI
370 Support for systems based on the Freescale 3xxx CPUs.
373 bool "Hilscher NetX based"
376 select GENERIC_CLOCKEVENTS
379 This enables support for systems based on the Hilscher NetX Soc
382 bool "Hynix HMS720x-based"
386 This enables support for systems based on the Hynix HMS720x
394 select ARCH_SUPPORTS_MSI
397 Support for Intel's IOP13XX (XScale) family of processors.
406 select ARCH_REQUIRE_GPIOLIB
408 Support for Intel's 80219 and IOP32X (XScale) family of
418 select ARCH_REQUIRE_GPIOLIB
420 Support for Intel's IOP33X (XScale) family of processors.
428 Support for Intel's IXP23xx (XScale) family of processors.
431 bool "IXP2400/2800-based"
436 Support for Intel's IXP2400/2800 (XScale) family of processors.
444 select GENERIC_CLOCKEVENTS
445 select DMABOUNCE if PCI
447 Support for Intel's IXP4XX (XScale) family of processors.
454 Say Y here if you intend to run this kernel on a LinkUp Systems
455 L7200 Software Development Board which uses an ARM720T processor.
456 Information on this board can be obtained at:
458 <http://www.linkupsys.com/>
460 If you have any questions or comments about the Linux kernel port
461 to this board, send e-mail to <sjhill@cotw.com>.
467 select ARCH_REQUIRE_GPIOLIB
469 select GENERIC_CLOCKEVENTS
472 Support for the Marvell Dove SoC 88AP510
475 bool "Marvell Kirkwood"
479 select ARCH_REQUIRE_GPIOLIB
481 select GENERIC_CLOCKEVENTS
484 Support for the following Marvell Kirkwood series SoCs:
485 88F6180, 88F6192 and 88F6281.
488 bool "Marvell Loki (88RC8480)"
491 select GENERIC_CLOCKEVENTS
494 Support for the Marvell Loki (88RC8480) SoC.
497 bool "Marvell MV78xx0"
501 select ARCH_REQUIRE_GPIOLIB
503 select GENERIC_CLOCKEVENTS
506 Support for the following Marvell MV78xx0 series SoCs:
515 select ARCH_REQUIRE_GPIOLIB
517 select GENERIC_CLOCKEVENTS
520 Support for the following Marvell Orion 5x series SoCs:
521 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
522 Orion-2 (5281), Orion-1-90 (6183).
525 bool "Marvell PXA168/910/MMP2"
528 select ARCH_REQUIRE_GPIOLIB
532 select GENERIC_CLOCKEVENTS
536 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
539 bool "Micrel/Kendin KS8695"
542 select ARCH_REQUIRE_GPIOLIB
544 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
545 System-on-Chip devices.
548 bool "NetSilicon NS9xxx"
552 select GENERIC_CLOCKEVENTS
555 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
558 <http://www.digi.com/products/microprocessors/index.jsp>
561 bool "Nuvoton W90X900 CPU"
563 select ARCH_REQUIRE_GPIOLIB
568 select GENERIC_CLOCKEVENTS
570 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
571 At present, the w90x900 has been renamed nuc900, regarding
572 the ARM series product line, you can login the following
573 link address to know more.
575 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
576 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
579 bool "Nuvoton NUC93X CPU"
584 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
585 low-power and high performance MPEG-4/JPEG multimedia controller chip.
588 bool "Philips Nexperia PNX4008 Mobile"
593 This enables support for Philips PNX4008 mobile platform.
596 bool "PXA2xx/PXA3xx-based"
599 select ARCH_HAS_CPUFREQ
603 select ARCH_REQUIRE_GPIOLIB
605 select GENERIC_CLOCKEVENTS
609 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
615 select GENERIC_CLOCKEVENTS
617 Support for Qualcomm MSM/QSD based systems. This runs on the
618 apps processor of the MSM/QSD and depends on a shared memory
619 interface to the modem processor which runs the baseband
620 stack and controls some vital subsystems
621 (clock and power control, etc).
624 bool "Renesas SH-Mobile"
626 Support for Renesas's SH-Mobile ARM platforms
633 select ARCH_MAY_HAVE_PC_FDC
634 select HAVE_PATA_PLATFORM
637 select ARCH_SPARSEMEM_ENABLE
639 On the Acorn Risc-PC, Linux can support the internal IDE disk and
640 CD-ROM interface, serial and parallel port, and the floppy drive.
646 select ARCH_SPARSEMEM_ENABLE
648 select ARCH_HAS_CPUFREQ
652 select GENERIC_CLOCKEVENTS
655 select ARCH_REQUIRE_GPIOLIB
657 Support for StrongARM 11x0 based boards.
660 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
662 select ARCH_HAS_CPUFREQ
665 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
666 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
667 the Samsung SMDK2410 development board (and derivatives).
669 Note, the S3C2416 and the S3C2450 are so close that they even share
670 the same SoC ID code. This means that there is no seperate machine
671 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
674 bool "Samsung S3C64XX"
681 select ARCH_HAS_CPUFREQ
682 select ARCH_REQUIRE_GPIOLIB
683 select SAMSUNG_CLKSRC
684 select SAMSUNG_IRQ_VIC_TIMER
685 select SAMSUNG_IRQ_UART
686 select S3C_GPIO_TRACK
687 select S3C_GPIO_PULL_UPDOWN
688 select S3C_GPIO_CFG_S3C24XX
689 select S3C_GPIO_CFG_S3C64XX
691 select USB_ARCH_HAS_OHCI
692 select SAMSUNG_GPIOLIB_4BIT
694 Samsung S3C64XX series based systems
697 bool "Samsung S5P6440"
702 Samsung S5P6440 CPU based systems
705 bool "Samsung S5P6442"
710 Samsung S5P6442 CPU based systems
713 bool "Samsung S5PC1XX"
717 select ARM_L1_CACHE_SHIFT_6
719 Samsung S5PC1XX series based systems
722 bool "Samsung S5PV210/S5PC110"
726 select ARM_L1_CACHE_SHIFT_6
728 Samsung S5PV210/S5PC110 series based systems
738 Support for the StrongARM based Digital DNARD machine, also known
739 as "Shark" (<http://www.shark-linux.de/shark.html>).
744 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
745 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
747 Say Y here for systems based on one of the Sharp LH7A40X
748 System on a Chip processors. These CPUs include an ARM922T
749 core with a wide array of integrated devices for
750 hand-held and low-power applications.
753 bool "ST-Ericsson U300 Series"
760 select GENERIC_CLOCKEVENTS
765 Support for ST-Ericsson U300 series mobile platforms.
768 bool "ST-Ericsson U8500 Series"
772 select GENERIC_CLOCKEVENTS
775 Support for ST-Ericsson's Ux500 architecture
778 bool "STMicroelectronics Nomadik"
785 select GENERIC_CLOCKEVENTS
787 select ARCH_REQUIRE_GPIOLIB
789 Support for the Nomadik platform by ST-Ericsson
795 select GENERIC_CLOCKEVENTS
797 select ARCH_REQUIRE_GPIOLIB
802 select GENERIC_ALLOCATOR
803 select ARCH_HAS_HOLES_MEMORYMODEL
805 Support for TI's DaVinci platform.
811 select ARCH_REQUIRE_GPIOLIB
812 select ARCH_HAS_CPUFREQ
814 select GENERIC_CLOCKEVENTS
815 select ARCH_HAS_HOLES_MEMORYMODEL
817 Support for TI's OMAP platform (OMAP1 and OMAP2).
822 # This is sorted alphabetically by mach-* pathname. However, plat-*
823 # Kconfigs may be included either alphabetically (according to the
824 # plat- suffix) or along side the corresponding mach-* source.
826 source "arch/arm/mach-aaec2000/Kconfig"
828 source "arch/arm/mach-at91/Kconfig"
830 source "arch/arm/mach-bcmring/Kconfig"
832 source "arch/arm/mach-clps711x/Kconfig"
834 source "arch/arm/mach-cns3xxx/Kconfig"
836 source "arch/arm/mach-davinci/Kconfig"
838 source "arch/arm/mach-dove/Kconfig"
840 source "arch/arm/mach-ep93xx/Kconfig"
842 source "arch/arm/mach-footbridge/Kconfig"
844 source "arch/arm/mach-gemini/Kconfig"
846 source "arch/arm/mach-h720x/Kconfig"
848 source "arch/arm/mach-integrator/Kconfig"
850 source "arch/arm/mach-iop32x/Kconfig"
852 source "arch/arm/mach-iop33x/Kconfig"
854 source "arch/arm/mach-iop13xx/Kconfig"
856 source "arch/arm/mach-ixp4xx/Kconfig"
858 source "arch/arm/mach-ixp2000/Kconfig"
860 source "arch/arm/mach-ixp23xx/Kconfig"
862 source "arch/arm/mach-kirkwood/Kconfig"
864 source "arch/arm/mach-ks8695/Kconfig"
866 source "arch/arm/mach-lh7a40x/Kconfig"
868 source "arch/arm/mach-loki/Kconfig"
870 source "arch/arm/mach-msm/Kconfig"
872 source "arch/arm/mach-mv78xx0/Kconfig"
874 source "arch/arm/plat-mxc/Kconfig"
876 source "arch/arm/mach-netx/Kconfig"
878 source "arch/arm/mach-nomadik/Kconfig"
879 source "arch/arm/plat-nomadik/Kconfig"
881 source "arch/arm/mach-ns9xxx/Kconfig"
883 source "arch/arm/mach-nuc93x/Kconfig"
885 source "arch/arm/plat-omap/Kconfig"
887 source "arch/arm/mach-omap1/Kconfig"
889 source "arch/arm/mach-omap2/Kconfig"
891 source "arch/arm/mach-orion5x/Kconfig"
893 source "arch/arm/mach-pxa/Kconfig"
894 source "arch/arm/plat-pxa/Kconfig"
896 source "arch/arm/mach-mmp/Kconfig"
898 source "arch/arm/mach-realview/Kconfig"
900 source "arch/arm/mach-sa1100/Kconfig"
902 source "arch/arm/plat-samsung/Kconfig"
903 source "arch/arm/plat-s3c24xx/Kconfig"
904 source "arch/arm/plat-s5p/Kconfig"
905 source "arch/arm/plat-s5pc1xx/Kconfig"
908 source "arch/arm/mach-s3c2400/Kconfig"
909 source "arch/arm/mach-s3c2410/Kconfig"
910 source "arch/arm/mach-s3c2412/Kconfig"
911 source "arch/arm/mach-s3c2416/Kconfig"
912 source "arch/arm/mach-s3c2440/Kconfig"
913 source "arch/arm/mach-s3c2443/Kconfig"
917 source "arch/arm/mach-s3c64xx/Kconfig"
920 source "arch/arm/mach-s5p6440/Kconfig"
922 source "arch/arm/mach-s5p6442/Kconfig"
925 source "arch/arm/mach-s5pc100/Kconfig"
928 source "arch/arm/mach-s5pv210/Kconfig"
930 source "arch/arm/mach-shmobile/Kconfig"
932 source "arch/arm/plat-stmp3xxx/Kconfig"
934 source "arch/arm/mach-u300/Kconfig"
936 source "arch/arm/mach-ux500/Kconfig"
938 source "arch/arm/mach-versatile/Kconfig"
940 source "arch/arm/mach-w90x900/Kconfig"
942 # Definitions to make life easier
948 select GENERIC_CLOCKEVENTS
957 source arch/arm/mm/Kconfig
960 bool "Enable iWMMXt support"
961 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
962 default y if PXA27x || PXA3xx || ARCH_MMP
964 Enable support for iWMMXt context switching at run time if
965 running on a CPU that supports it.
967 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
970 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
974 depends on CPU_V6 || CPU_V7 || XSCALE_PMU
979 source "arch/arm/Kconfig-nommu"
982 config ARM_ERRATA_411920
983 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
984 depends on CPU_V6 && !SMP
986 Invalidation of the Instruction Cache operation can
987 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
988 It does not affect the MPCore. This option enables the ARM Ltd.
989 recommended workaround.
991 config ARM_ERRATA_430973
992 bool "ARM errata: Stale prediction on replaced interworking branch"
995 This option enables the workaround for the 430973 Cortex-A8
996 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
997 interworking branch is replaced with another code sequence at the
998 same virtual address, whether due to self-modifying code or virtual
999 to physical address re-mapping, Cortex-A8 does not recover from the
1000 stale interworking branch prediction. This results in Cortex-A8
1001 executing the new code sequence in the incorrect ARM or Thumb state.
1002 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1003 and also flushes the branch target cache at every context switch.
1004 Note that setting specific bits in the ACTLR register may not be
1005 available in non-secure mode.
1007 config ARM_ERRATA_458693
1008 bool "ARM errata: Processor deadlock when a false hazard is created"
1011 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1012 erratum. For very specific sequences of memory operations, it is
1013 possible for a hazard condition intended for a cache line to instead
1014 be incorrectly associated with a different cache line. This false
1015 hazard might then cause a processor deadlock. The workaround enables
1016 the L1 caching of the NEON accesses and disables the PLD instruction
1017 in the ACTLR register. Note that setting specific bits in the ACTLR
1018 register may not be available in non-secure mode.
1020 config ARM_ERRATA_460075
1021 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1024 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1025 erratum. Any asynchronous access to the L2 cache may encounter a
1026 situation in which recent store transactions to the L2 cache are lost
1027 and overwritten with stale memory contents from external memory. The
1028 workaround disables the write-allocate mode for the L2 cache via the
1029 ACTLR register. Note that setting specific bits in the ACTLR register
1030 may not be available in non-secure mode.
1032 config PL310_ERRATA_588369
1033 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1034 depends on CACHE_L2X0 && ARCH_OMAP4
1036 The PL310 L2 cache controller implements three types of Clean &
1037 Invalidate maintenance operations: by Physical Address
1038 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1039 They are architecturally defined to behave as the execution of a
1040 clean operation followed immediately by an invalidate operation,
1041 both performing to the same memory location. This functionality
1042 is not correctly implemented in PL310 as clean lines are not
1043 invalidated as a result of these operations. Note that this errata
1044 uses Texas Instrument's secure monitor api.
1047 source "arch/arm/common/Kconfig"
1049 config FORCE_MAX_ZONEORDER
1062 Find out whether you have ISA slots on your motherboard. ISA is the
1063 name of a bus system, i.e. the way the CPU talks to the other stuff
1064 inside your box. Other bus systems are PCI, EISA, MicroChannel
1065 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1066 newer boards don't support it. If you have ISA, say Y, otherwise N.
1068 # Select ISA DMA controller support
1073 # Select ISA DMA interface
1078 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1080 Find out whether you have a PCI motherboard. PCI is the name of a
1081 bus system, i.e. the way the CPU talks to the other stuff inside
1082 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1083 VESA. If you have PCI, say Y, otherwise N.
1088 # Select the host bridge type
1089 config PCI_HOST_VIA82C505
1091 depends on PCI && ARCH_SHARK
1094 config PCI_HOST_ITE8152
1096 depends on PCI && MACH_ARMCORE
1100 source "drivers/pci/Kconfig"
1102 source "drivers/pcmcia/Kconfig"
1106 menu "Kernel Features"
1108 source "kernel/time/Kconfig"
1111 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1112 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1113 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1114 depends on GENERIC_CLOCKEVENTS
1115 select USE_GENERIC_SMP_HELPERS
1116 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1118 This enables support for systems with more than one CPU. If you have
1119 a system with only one CPU, like most personal computers, say N. If
1120 you have a system with more than one CPU, say Y.
1122 If you say N here, the kernel will run on single and multiprocessor
1123 machines, but will use only one CPU of a multiprocessor machine. If
1124 you say Y here, the kernel will run on many, but not all, single
1125 processor machines. On a single processor machine, the kernel will
1126 run faster if you say N here.
1128 See also <file:Documentation/i386/IO-APIC.txt>,
1129 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1130 <http://www.linuxdoc.org/docs.html#howto>.
1132 If you don't know what to do here, say N.
1138 This option enables support for the ARM system coherency unit
1144 This options enables support for the ARM timer and watchdog unit
1147 prompt "Memory split"
1150 Select the desired split between kernel and user memory.
1152 If you are not absolutely sure what you are doing, leave this
1156 bool "3G/1G user/kernel split"
1158 bool "2G/2G user/kernel split"
1160 bool "1G/3G user/kernel split"
1165 default 0x40000000 if VMSPLIT_1G
1166 default 0x80000000 if VMSPLIT_2G
1170 int "Maximum number of CPUs (2-32)"
1176 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1177 depends on SMP && HOTPLUG && EXPERIMENTAL
1179 Say Y here to experiment with turning CPUs off and on. CPUs
1180 can be controlled through /sys/devices/system/cpu.
1183 bool "Use local timer interrupts"
1184 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1185 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1187 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1189 Enable support for local timers on SMP platforms, rather then the
1190 legacy IPI broadcast method. Local timers allows the system
1191 accounting to be spread across the timer interval, preventing a
1192 "thundering herd" at every timer tick.
1194 source kernel/Kconfig.preempt
1198 default 128 if ARCH_L7200
1199 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1200 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1201 default AT91_TIMER_HZ if ARCH_AT91
1204 config THUMB2_KERNEL
1205 bool "Compile the kernel in Thumb-2 mode"
1206 depends on CPU_V7 && EXPERIMENTAL
1208 select ARM_ASM_UNIFIED
1210 By enabling this option, the kernel will be compiled in
1211 Thumb-2 mode. A compiler/assembler that understand the unified
1212 ARM-Thumb syntax is needed.
1216 config ARM_ASM_UNIFIED
1220 bool "Use the ARM EABI to compile the kernel"
1222 This option allows for the kernel to be compiled using the latest
1223 ARM ABI (aka EABI). This is only useful if you are using a user
1224 space environment that is also compiled with EABI.
1226 Since there are major incompatibilities between the legacy ABI and
1227 EABI, especially with regard to structure member alignment, this
1228 option also changes the kernel syscall calling convention to
1229 disambiguate both ABIs and allow for backward compatibility support
1230 (selected with CONFIG_OABI_COMPAT).
1232 To use this you need GCC version 4.0.0 or later.
1235 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1236 depends on AEABI && EXPERIMENTAL
1239 This option preserves the old syscall interface along with the
1240 new (ARM EABI) one. It also provides a compatibility layer to
1241 intercept syscalls that have structure arguments which layout
1242 in memory differs between the legacy ABI and the new ARM EABI
1243 (only for non "thumb" binaries). This option adds a tiny
1244 overhead to all syscalls and produces a slightly larger kernel.
1245 If you know you'll be using only pure EABI user space then you
1246 can say N here. If this option is not selected and you attempt
1247 to execute a legacy ABI binary then the result will be
1248 UNPREDICTABLE (in fact it can be predicted that it won't work
1249 at all). If in doubt say Y.
1251 config ARCH_HAS_HOLES_MEMORYMODEL
1254 # Discontigmem is deprecated
1255 config ARCH_DISCONTIGMEM_ENABLE
1258 config ARCH_SPARSEMEM_ENABLE
1261 config ARCH_SPARSEMEM_DEFAULT
1262 def_bool ARCH_SPARSEMEM_ENABLE
1264 config ARCH_SELECT_MEMORY_MODEL
1265 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1269 default "4" if ARCH_LH7A40X
1271 depends on NEED_MULTIPLE_NODES
1274 bool "High Memory Support (EXPERIMENTAL)"
1275 depends on MMU && EXPERIMENTAL
1277 The address space of ARM processors is only 4 Gigabytes large
1278 and it has to accommodate user address space, kernel address
1279 space as well as some memory mapped IO. That means that, if you
1280 have a large amount of physical memory and/or IO, not all of the
1281 memory can be "permanently mapped" by the kernel. The physical
1282 memory that is not permanently mapped is called "high memory".
1284 Depending on the selected kernel/user memory split, minimum
1285 vmalloc space and actual amount of RAM, you may not need this
1286 option which should result in a slightly faster kernel.
1291 bool "Allocate 2nd-level pagetables from highmem"
1293 depends on !OUTER_CACHE
1295 config HW_PERF_EVENTS
1296 bool "Enable hardware performance counter support for perf events"
1297 depends on PERF_EVENTS && CPU_HAS_PMU && (CPU_V6 || CPU_V7)
1300 Enable hardware performance counter support for perf events. If
1301 disabled, perf events will use software events only.
1306 bool "Timer and CPU usage LEDs"
1307 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1308 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1309 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1310 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1311 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1312 ARCH_AT91 || ARCH_DAVINCI || \
1313 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1315 If you say Y here, the LEDs on your machine will be used
1316 to provide useful information about your current system status.
1318 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1319 be able to select which LEDs are active using the options below. If
1320 you are compiling a kernel for the EBSA-110 or the LART however, the
1321 red LED will simply flash regularly to indicate that the system is
1322 still functional. It is safe to say Y here if you have a CATS
1323 system, but the driver will do nothing.
1326 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1327 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1328 || MACH_OMAP_PERSEUS2
1330 depends on !GENERIC_CLOCKEVENTS
1331 default y if ARCH_EBSA110
1333 If you say Y here, one of the system LEDs (the green one on the
1334 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1335 will flash regularly to indicate that the system is still
1336 operational. This is mainly useful to kernel hackers who are
1337 debugging unstable kernels.
1339 The LART uses the same LED for both Timer LED and CPU usage LED
1340 functions. You may choose to use both, but the Timer LED function
1341 will overrule the CPU usage LED.
1344 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1346 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1347 || MACH_OMAP_PERSEUS2
1350 If you say Y here, the red LED will be used to give a good real
1351 time indication of CPU usage, by lighting whenever the idle task
1352 is not currently executing.
1354 The LART uses the same LED for both Timer LED and CPU usage LED
1355 functions. You may choose to use both, but the Timer LED function
1356 will overrule the CPU usage LED.
1358 config ALIGNMENT_TRAP
1360 depends on CPU_CP15_MMU
1361 default y if !ARCH_EBSA110
1362 select HAVE_PROC_CPU if PROC_FS
1364 ARM processors cannot fetch/store information which is not
1365 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1366 address divisible by 4. On 32-bit ARM processors, these non-aligned
1367 fetch/store instructions will be emulated in software if you say
1368 here, which has a severe performance impact. This is necessary for
1369 correct operation of some network protocols. With an IP-only
1370 configuration it is safe to say N, otherwise say Y.
1372 config UACCESS_WITH_MEMCPY
1373 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1374 depends on MMU && EXPERIMENTAL
1375 default y if CPU_FEROCEON
1377 Implement faster copy_to_user and clear_user methods for CPU
1378 cores where a 8-word STM instruction give significantly higher
1379 memory write throughput than a sequence of individual 32bit stores.
1381 A possible side effect is a slight increase in scheduling latency
1382 between threads sharing the same address space if they invoke
1383 such copy operations with large buffers.
1385 However, if the CPU data cache is using a write-allocate mode,
1386 this option is unlikely to provide any performance gain.
1392 # Compressed boot loader in ROM. Yes, we really want to ask about
1393 # TEXT and BSS so we preserve their values in the config files.
1394 config ZBOOT_ROM_TEXT
1395 hex "Compressed ROM boot loader base address"
1398 The physical address at which the ROM-able zImage is to be
1399 placed in the target. Platforms which normally make use of
1400 ROM-able zImage formats normally set this to a suitable
1401 value in their defconfig file.
1403 If ZBOOT_ROM is not enabled, this has no effect.
1405 config ZBOOT_ROM_BSS
1406 hex "Compressed ROM boot loader BSS address"
1409 The base address of an area of read/write memory in the target
1410 for the ROM-able zImage which must be available while the
1411 decompressor is running. It must be large enough to hold the
1412 entire decompressed kernel plus an additional 128 KiB.
1413 Platforms which normally make use of ROM-able zImage formats
1414 normally set this to a suitable value in their defconfig file.
1416 If ZBOOT_ROM is not enabled, this has no effect.
1419 bool "Compressed boot loader in ROM/flash"
1420 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1422 Say Y here if you intend to execute your compressed kernel image
1423 (zImage) directly from ROM or flash. If unsure, say N.
1426 string "Default kernel command string"
1429 On some architectures (EBSA110 and CATS), there is currently no way
1430 for the boot loader to pass arguments to the kernel. For these
1431 architectures, you should supply some command-line options at build
1432 time by entering them here. As a minimum, you should specify the
1433 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1436 bool "Kernel Execute-In-Place from ROM"
1437 depends on !ZBOOT_ROM
1439 Execute-In-Place allows the kernel to run from non-volatile storage
1440 directly addressable by the CPU, such as NOR flash. This saves RAM
1441 space since the text section of the kernel is not loaded from flash
1442 to RAM. Read-write sections, such as the data section and stack,
1443 are still copied to RAM. The XIP kernel is not compressed since
1444 it has to run directly from flash, so it will take more space to
1445 store it. The flash address used to link the kernel object files,
1446 and for storing it, is configuration dependent. Therefore, if you
1447 say Y here, you must know the proper physical address where to
1448 store the kernel image depending on your own flash memory usage.
1450 Also note that the make target becomes "make xipImage" rather than
1451 "make zImage" or "make Image". The final kernel binary to put in
1452 ROM memory will be arch/arm/boot/xipImage.
1456 config XIP_PHYS_ADDR
1457 hex "XIP Kernel Physical Location"
1458 depends on XIP_KERNEL
1459 default "0x00080000"
1461 This is the physical address in your flash memory the kernel will
1462 be linked for and stored to. This address is dependent on your
1466 bool "Kexec system call (EXPERIMENTAL)"
1467 depends on EXPERIMENTAL
1469 kexec is a system call that implements the ability to shutdown your
1470 current kernel, and to start another kernel. It is like a reboot
1471 but it is independent of the system firmware. And like a reboot
1472 you can start any kernel with it, not just Linux.
1474 It is an ongoing process to be certain the hardware in a machine
1475 is properly shutdown, so do not be surprised if this code does not
1476 initially work for you. It may help to enable device hotplugging
1480 bool "Export atags in procfs"
1484 Should the atags used to boot the kernel be exported in an "atags"
1485 file in procfs. Useful with kexec.
1489 menu "CPU Power Management"
1493 source "drivers/cpufreq/Kconfig"
1495 config CPU_FREQ_SA1100
1498 config CPU_FREQ_SA1110
1501 config CPU_FREQ_INTEGRATOR
1502 tristate "CPUfreq driver for ARM Integrator CPUs"
1503 depends on ARCH_INTEGRATOR && CPU_FREQ
1506 This enables the CPUfreq driver for ARM Integrator CPUs.
1508 For details, take a look at <file:Documentation/cpu-freq>.
1514 depends on CPU_FREQ && ARCH_PXA && PXA25x
1516 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1518 config CPU_FREQ_S3C64XX
1519 bool "CPUfreq support for Samsung S3C64XX CPUs"
1520 depends on CPU_FREQ && CPU_S3C6410
1525 Internal configuration node for common cpufreq on Samsung SoC
1527 config CPU_FREQ_S3C24XX
1528 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1529 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1532 This enables the CPUfreq driver for the Samsung S3C24XX family
1535 For details, take a look at <file:Documentation/cpu-freq>.
1539 config CPU_FREQ_S3C24XX_PLL
1540 bool "Support CPUfreq changing of PLL frequency"
1541 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1543 Compile in support for changing the PLL frequency from the
1544 S3C24XX series CPUfreq driver. The PLL takes time to settle
1545 after a frequency change, so by default it is not enabled.
1547 This also means that the PLL tables for the selected CPU(s) will
1548 be built which may increase the size of the kernel image.
1550 config CPU_FREQ_S3C24XX_DEBUG
1551 bool "Debug CPUfreq Samsung driver core"
1552 depends on CPU_FREQ_S3C24XX
1554 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1556 config CPU_FREQ_S3C24XX_IODEBUG
1557 bool "Debug CPUfreq Samsung driver IO timing"
1558 depends on CPU_FREQ_S3C24XX
1560 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1562 config CPU_FREQ_S3C24XX_DEBUGFS
1563 bool "Export debugfs for CPUFreq"
1564 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1566 Export status information via debugfs.
1570 source "drivers/cpuidle/Kconfig"
1574 menu "Floating point emulation"
1576 comment "At least one emulation must be selected"
1579 bool "NWFPE math emulation"
1580 depends on !AEABI || OABI_COMPAT
1582 Say Y to include the NWFPE floating point emulator in the kernel.
1583 This is necessary to run most binaries. Linux does not currently
1584 support floating point hardware so you need to say Y here even if
1585 your machine has an FPA or floating point co-processor podule.
1587 You may say N here if you are going to load the Acorn FPEmulator
1588 early in the bootup.
1591 bool "Support extended precision"
1592 depends on FPE_NWFPE
1594 Say Y to include 80-bit support in the kernel floating-point
1595 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1596 Note that gcc does not generate 80-bit operations by default,
1597 so in most cases this option only enlarges the size of the
1598 floating point emulator without any good reason.
1600 You almost surely want to say N here.
1603 bool "FastFPE math emulation (EXPERIMENTAL)"
1604 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1606 Say Y here to include the FAST floating point emulator in the kernel.
1607 This is an experimental much faster emulator which now also has full
1608 precision for the mantissa. It does not support any exceptions.
1609 It is very simple, and approximately 3-6 times faster than NWFPE.
1611 It should be sufficient for most programs. It may be not suitable
1612 for scientific calculations, but you have to check this for yourself.
1613 If you do not feel you need a faster FP emulation you should better
1617 bool "VFP-format floating point maths"
1618 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1620 Say Y to include VFP support code in the kernel. This is needed
1621 if your hardware includes a VFP unit.
1623 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1624 release notes and additional status information.
1626 Say N if your target does not have VFP hardware.
1634 bool "Advanced SIMD (NEON) Extension support"
1635 depends on VFPv3 && CPU_V7
1637 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1642 menu "Userspace binary formats"
1644 source "fs/Kconfig.binfmt"
1647 tristate "RISC OS personality"
1650 Say Y here to include the kernel code necessary if you want to run
1651 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1652 experimental; if this sounds frightening, say N and sleep in peace.
1653 You can also say M here to compile this support as a module (which
1654 will be called arthur).
1658 menu "Power management options"
1660 source "kernel/power/Kconfig"
1662 config ARCH_SUSPEND_POSSIBLE
1667 source "net/Kconfig"
1669 source "drivers/Kconfig"
1673 source "arch/arm/Kconfig.debug"
1675 source "security/Kconfig"
1677 source "crypto/Kconfig"
1679 source "lib/Kconfig"