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
25 The ARM series is a line of low-power-consumption RISC chip designs
26 licensed by ARM Ltd and targeted at embedded applications and
27 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
28 manufactured, but legacy ARM-based PC hardware remains popular in
29 Europe. There is an ARM Linux project with a web page at
30 <http://www.arm.linux.org.uk/>.
35 config SYS_SUPPORTS_APM_EMULATION
44 config GENERIC_CLOCKEVENTS
47 config GENERIC_CLOCKEVENTS_BROADCAST
49 depends on GENERIC_CLOCKEVENTS
50 default y if SMP && !LOCAL_TIMERS
54 select GENERIC_ALLOCATOR
65 The Extended Industry Standard Architecture (EISA) bus was
66 developed as an open alternative to the IBM MicroChannel bus.
68 The EISA bus provided some of the features of the IBM MicroChannel
69 bus while maintaining backward compatibility with cards made for
70 the older ISA bus. The EISA bus saw limited use between 1988 and
71 1995 when it was made obsolete by the PCI bus.
73 Say Y here if you are building a kernel for an EISA-based machine.
83 MicroChannel Architecture is found in some IBM PS/2 machines and
84 laptops. It is a bus system similar to PCI or ISA. See
85 <file:Documentation/mca.txt> (and especially the web page given
86 there) before attempting to build an MCA bus kernel.
88 config GENERIC_HARDIRQS
92 config STACKTRACE_SUPPORT
96 config HAVE_LATENCYTOP_SUPPORT
101 config LOCKDEP_SUPPORT
105 config TRACE_IRQFLAGS_SUPPORT
109 config HARDIRQS_SW_RESEND
113 config GENERIC_IRQ_PROBE
117 config GENERIC_LOCKBREAK
120 depends on SMP && PREEMPT
122 config RWSEM_GENERIC_SPINLOCK
126 config RWSEM_XCHGADD_ALGORITHM
129 config ARCH_HAS_ILOG2_U32
132 config ARCH_HAS_ILOG2_U64
135 config ARCH_HAS_CPUFREQ
138 Internal node to signify that the ARCH has CPUFREQ support
139 and that the relevant menu configurations are displayed for
142 config GENERIC_HWEIGHT
146 config GENERIC_CALIBRATE_DELAY
150 config ARCH_MAY_HAVE_PC_FDC
156 config GENERIC_ISA_DMA
165 config GENERIC_HARDIRQS_NO__DO_IRQ
170 config OPROFILE_ARMV6
172 depends on CPU_V6 && !SMP
173 select OPROFILE_ARM11_CORE
175 config OPROFILE_MPCORE
177 depends on CPU_V6 && SMP
178 select OPROFILE_ARM11_CORE
180 config OPROFILE_ARM11_CORE
183 config OPROFILE_ARMV7
185 depends on CPU_V7 && !SMP
192 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
193 default DRAM_BASE if REMAP_VECTORS_TO_RAM
196 The base address of exception vectors.
198 source "init/Kconfig"
200 source "kernel/Kconfig.freezer"
205 bool "MMU-based Paged Memory Management Support"
208 Select if you want MMU-based virtualised addressing space
209 support by paged memory management. If unsure, say 'Y'.
212 prompt "ARM system type"
213 default ARCH_VERSATILE
216 bool "Agilent AAEC-2000 based"
221 This enables support for systems based on the Agilent AAEC-2000
223 config ARCH_INTEGRATOR
224 bool "ARM Ltd. Integrator family"
226 select ARCH_HAS_CPUFREQ
231 Support for ARM's Integrator platform.
234 bool "ARM Ltd. RealView family"
240 select GENERIC_CLOCKEVENTS
241 select ARCH_WANT_OPTIONAL_GPIOLIB
243 This enables support for ARM Ltd RealView boards.
245 config ARCH_VERSATILE
246 bool "ARM Ltd. Versatile family"
253 select GENERIC_CLOCKEVENTS
254 select ARCH_WANT_OPTIONAL_GPIOLIB
256 This enables support for ARM Ltd Versatile board.
261 select ARCH_REQUIRE_GPIOLIB
264 This enables support for systems based on the Atmel AT91RM9200,
265 AT91SAM9 and AT91CAP9 processors.
268 bool "Cirrus Logic CLPS711x/EP721x-based"
271 Support for Cirrus Logic 711x/721x based boards.
274 bool "Cortina Systems Gemini"
277 select ARCH_REQUIRE_GPIOLIB
279 Support for the Cortina Systems Gemini family SoCs
287 This is an evaluation board for the StrongARM processor available
288 from Digital. It has limited hardware on-board, including an
289 Ethernet interface, two PCMCIA sockets, two serial ports and a
300 select ARCH_REQUIRE_GPIOLIB
301 select ARCH_HAS_HOLES_MEMORYMODEL
303 This enables support for the Cirrus EP93xx series of CPUs.
305 config ARCH_FOOTBRIDGE
310 Support for systems based on the DC21285 companion chip
311 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
314 bool "Freescale MXC/iMX-based"
316 select GENERIC_CLOCKEVENTS
319 select ARCH_REQUIRE_GPIOLIB
322 Support for Freescale MXC/iMX-based family of processors
325 bool "Freescale STMP3xxx"
329 select ARCH_REQUIRE_GPIOLIB
331 select GENERIC_CLOCKEVENTS
333 select USB_ARCH_HAS_EHCI
335 Support for systems based on the Freescale 3xxx CPUs.
338 bool "Hilscher NetX based"
341 select GENERIC_CLOCKEVENTS
344 This enables support for systems based on the Hilscher NetX Soc
347 bool "Hynix HMS720x-based"
351 This enables support for systems based on the Hynix HMS720x
354 bool "STMicroelectronics Nomadik"
361 select GENERIC_CLOCKEVENTS
363 select ARCH_REQUIRE_GPIOLIB
365 Support for the Nomadik platform by ST-Ericsson
373 select ARCH_SUPPORTS_MSI
376 Support for Intel's IOP13XX (XScale) family of processors.
385 select ARCH_REQUIRE_GPIOLIB
387 Support for Intel's 80219 and IOP32X (XScale) family of
397 select ARCH_REQUIRE_GPIOLIB
399 Support for Intel's IOP33X (XScale) family of processors.
407 Support for Intel's IXP23xx (XScale) family of processors.
410 bool "IXP2400/2800-based"
415 Support for Intel's IXP2400/2800 (XScale) family of processors.
423 select GENERIC_CLOCKEVENTS
424 select DMABOUNCE if PCI
426 Support for Intel's IXP4XX (XScale) family of processors.
433 Say Y here if you intend to run this kernel on a LinkUp Systems
434 L7200 Software Development Board which uses an ARM720T processor.
435 Information on this board can be obtained at:
437 <http://www.linkupsys.com/>
439 If you have any questions or comments about the Linux kernel port
440 to this board, send e-mail to <sjhill@cotw.com>.
446 select ARCH_REQUIRE_GPIOLIB
448 select GENERIC_CLOCKEVENTS
451 Support for the Marvell Dove SoC 88AP510
454 bool "Marvell Kirkwood"
458 select ARCH_REQUIRE_GPIOLIB
460 select GENERIC_CLOCKEVENTS
463 Support for the following Marvell Kirkwood series SoCs:
464 88F6180, 88F6192 and 88F6281.
467 bool "Marvell Loki (88RC8480)"
470 select GENERIC_CLOCKEVENTS
473 Support for the Marvell Loki (88RC8480) SoC.
476 bool "Marvell MV78xx0"
480 select ARCH_REQUIRE_GPIOLIB
482 select GENERIC_CLOCKEVENTS
485 Support for the following Marvell MV78xx0 series SoCs:
494 select ARCH_REQUIRE_GPIOLIB
496 select GENERIC_CLOCKEVENTS
499 Support for the following Marvell Orion 5x series SoCs:
500 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
501 Orion-2 (5281), Orion-1-90 (6183).
504 bool "Marvell PXA168/910"
507 select ARCH_REQUIRE_GPIOLIB
511 select GENERIC_CLOCKEVENTS
515 Support for Marvell's PXA168/910 processor line.
518 bool "Micrel/Kendin KS8695"
521 select ARCH_REQUIRE_GPIOLIB
523 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
524 System-on-Chip devices.
527 bool "NetSilicon NS9xxx"
531 select GENERIC_CLOCKEVENTS
534 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
537 <http://www.digi.com/products/microprocessors/index.jsp>
540 bool "Nuvoton W90X900 CPU"
542 select ARCH_REQUIRE_GPIOLIB
547 select GENERIC_CLOCKEVENTS
549 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
550 At present, the w90x900 has been renamed nuc900, regarding
551 the ARM series product line, you can login the following
552 link address to know more.
554 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
555 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
558 bool "Philips Nexperia PNX4008 Mobile"
562 This enables support for Philips PNX4008 mobile platform.
565 bool "PXA2xx/PXA3xx-based"
568 select ARCH_HAS_CPUFREQ
572 select ARCH_REQUIRE_GPIOLIB
574 select GENERIC_CLOCKEVENTS
578 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
584 select GENERIC_CLOCKEVENTS
586 Support for Qualcomm MSM7K based systems. This runs on the ARM11
587 apps processor of the MSM7K and depends on a shared memory
588 interface to the ARM9 modem processor which runs the baseband stack
589 and controls some vital subsystems (clock and power control, etc).
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"
636 select ARCH_HAS_CPUFREQ
638 Samsung S3C64XX series based systems
641 bool "Samsung S5PC1XX"
646 Samsung S5PC1XX series based systems
656 Support for the StrongARM based Digital DNARD machine, also known
657 as "Shark" (<http://www.shark-linux.de/shark.html>).
662 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
663 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
665 Say Y here for systems based on one of the Sharp LH7A40X
666 System on a Chip processors. These CPUs include an ARM922T
667 core with a wide array of integrated devices for
668 hand-held and low-power applications.
671 bool "ST-Ericsson U300 Series"
678 select GENERIC_CLOCKEVENTS
683 Support for ST-Ericsson U300 series mobile platforms.
689 select GENERIC_CLOCKEVENTS
691 select ARCH_REQUIRE_GPIOLIB
696 select GENERIC_ALLOCATOR
697 select ARCH_HAS_HOLES_MEMORYMODEL
699 Support for TI's DaVinci platform.
705 select ARCH_REQUIRE_GPIOLIB
706 select ARCH_HAS_CPUFREQ
708 select GENERIC_CLOCKEVENTS
710 Support for TI's OMAP platform (OMAP1 and OMAP2).
713 bool "Broadcom BCMRING"
719 select GENERIC_CLOCKEVENTS
720 select ARCH_WANT_OPTIONAL_GPIOLIB
722 Support for Broadcom's BCMRing platform.
725 bool "ST-Ericsson U8500 Series"
729 select GENERIC_CLOCKEVENTS
732 Support for ST-Ericsson's Ux500 architecture
736 source "arch/arm/mach-clps711x/Kconfig"
738 source "arch/arm/mach-ep93xx/Kconfig"
740 source "arch/arm/mach-footbridge/Kconfig"
742 source "arch/arm/mach-gemini/Kconfig"
744 source "arch/arm/mach-integrator/Kconfig"
746 source "arch/arm/mach-iop32x/Kconfig"
748 source "arch/arm/mach-iop33x/Kconfig"
750 source "arch/arm/mach-iop13xx/Kconfig"
752 source "arch/arm/mach-ixp4xx/Kconfig"
754 source "arch/arm/mach-ixp2000/Kconfig"
756 source "arch/arm/mach-ixp23xx/Kconfig"
758 source "arch/arm/mach-loki/Kconfig"
760 source "arch/arm/mach-mv78xx0/Kconfig"
762 source "arch/arm/mach-pxa/Kconfig"
763 source "arch/arm/plat-pxa/Kconfig"
765 source "arch/arm/mach-mmp/Kconfig"
767 source "arch/arm/mach-sa1100/Kconfig"
769 source "arch/arm/plat-omap/Kconfig"
771 source "arch/arm/mach-omap1/Kconfig"
773 source "arch/arm/mach-omap2/Kconfig"
775 source "arch/arm/mach-orion5x/Kconfig"
777 source "arch/arm/mach-kirkwood/Kconfig"
779 source "arch/arm/mach-dove/Kconfig"
781 source "arch/arm/plat-samsung/Kconfig"
782 source "arch/arm/plat-s3c24xx/Kconfig"
783 source "arch/arm/plat-s3c64xx/Kconfig"
784 source "arch/arm/plat-s3c/Kconfig"
785 source "arch/arm/plat-s5pc1xx/Kconfig"
788 source "arch/arm/mach-s3c2400/Kconfig"
789 source "arch/arm/mach-s3c2410/Kconfig"
790 source "arch/arm/mach-s3c2412/Kconfig"
791 source "arch/arm/mach-s3c2440/Kconfig"
792 source "arch/arm/mach-s3c2442/Kconfig"
793 source "arch/arm/mach-s3c2443/Kconfig"
797 source "arch/arm/mach-s3c6400/Kconfig"
798 source "arch/arm/mach-s3c6410/Kconfig"
801 source "arch/arm/plat-stmp3xxx/Kconfig"
804 source "arch/arm/mach-s5pc100/Kconfig"
807 source "arch/arm/mach-lh7a40x/Kconfig"
809 source "arch/arm/mach-h720x/Kconfig"
811 source "arch/arm/mach-versatile/Kconfig"
813 source "arch/arm/mach-aaec2000/Kconfig"
815 source "arch/arm/mach-realview/Kconfig"
817 source "arch/arm/mach-at91/Kconfig"
819 source "arch/arm/plat-mxc/Kconfig"
821 source "arch/arm/mach-nomadik/Kconfig"
822 source "arch/arm/plat-nomadik/Kconfig"
824 source "arch/arm/mach-netx/Kconfig"
826 source "arch/arm/mach-ns9xxx/Kconfig"
828 source "arch/arm/mach-davinci/Kconfig"
830 source "arch/arm/mach-ks8695/Kconfig"
832 source "arch/arm/mach-msm/Kconfig"
834 source "arch/arm/mach-u300/Kconfig"
836 source "arch/arm/mach-w90x900/Kconfig"
838 source "arch/arm/mach-bcmring/Kconfig"
840 source "arch/arm/mach-ux500/Kconfig"
842 # Definitions to make life easier
848 select GENERIC_CLOCKEVENTS
857 source arch/arm/mm/Kconfig
860 bool "Enable iWMMXt support"
861 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
862 default y if PXA27x || PXA3xx || ARCH_MMP
864 Enable support for iWMMXt context switching at run time if
865 running on a CPU that supports it.
867 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
870 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
874 source "arch/arm/Kconfig-nommu"
877 config ARM_ERRATA_411920
878 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
879 depends on CPU_V6 && !SMP
881 Invalidation of the Instruction Cache operation can
882 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
883 It does not affect the MPCore. This option enables the ARM Ltd.
884 recommended workaround.
886 config ARM_ERRATA_430973
887 bool "ARM errata: Stale prediction on replaced interworking branch"
890 This option enables the workaround for the 430973 Cortex-A8
891 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
892 interworking branch is replaced with another code sequence at the
893 same virtual address, whether due to self-modifying code or virtual
894 to physical address re-mapping, Cortex-A8 does not recover from the
895 stale interworking branch prediction. This results in Cortex-A8
896 executing the new code sequence in the incorrect ARM or Thumb state.
897 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
898 and also flushes the branch target cache at every context switch.
899 Note that setting specific bits in the ACTLR register may not be
900 available in non-secure mode.
902 config ARM_ERRATA_458693
903 bool "ARM errata: Processor deadlock when a false hazard is created"
906 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
907 erratum. For very specific sequences of memory operations, it is
908 possible for a hazard condition intended for a cache line to instead
909 be incorrectly associated with a different cache line. This false
910 hazard might then cause a processor deadlock. The workaround enables
911 the L1 caching of the NEON accesses and disables the PLD instruction
912 in the ACTLR register. Note that setting specific bits in the ACTLR
913 register may not be available in non-secure mode.
915 config ARM_ERRATA_460075
916 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
919 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
920 erratum. Any asynchronous access to the L2 cache may encounter a
921 situation in which recent store transactions to the L2 cache are lost
922 and overwritten with stale memory contents from external memory. The
923 workaround disables the write-allocate mode for the L2 cache via the
924 ACTLR register. Note that setting specific bits in the ACTLR register
925 may not be available in non-secure mode.
927 config PL310_ERRATA_588369
928 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
929 depends on CACHE_L2X0 && ARCH_OMAP4
931 The PL310 L2 cache controller implements three types of Clean &
932 Invalidate maintenance operations: by Physical Address
933 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
934 They are architecturally defined to behave as the execution of a
935 clean operation followed immediately by an invalidate operation,
936 both performing to the same memory location. This functionality
937 is not correctly implemented in PL310 as clean lines are not
938 invalidated as a result of these operations. Note that this errata
939 uses Texas Instrument's secure monitor api.
942 source "arch/arm/common/Kconfig"
944 config FORCE_MAX_ZONEORDER
957 Find out whether you have ISA slots on your motherboard. ISA is the
958 name of a bus system, i.e. the way the CPU talks to the other stuff
959 inside your box. Other bus systems are PCI, EISA, MicroChannel
960 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
961 newer boards don't support it. If you have ISA, say Y, otherwise N.
963 # Select ISA DMA controller support
968 # Select ISA DMA interface
973 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
975 Find out whether you have a PCI motherboard. PCI is the name of a
976 bus system, i.e. the way the CPU talks to the other stuff inside
977 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
978 VESA. If you have PCI, say Y, otherwise N.
983 # Select the host bridge type
984 config PCI_HOST_VIA82C505
986 depends on PCI && ARCH_SHARK
989 config PCI_HOST_ITE8152
991 depends on PCI && MACH_ARMCORE
995 source "drivers/pci/Kconfig"
997 source "drivers/pcmcia/Kconfig"
1001 menu "Kernel Features"
1003 source "kernel/time/Kconfig"
1006 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1007 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1008 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1009 depends on GENERIC_CLOCKEVENTS
1010 select USE_GENERIC_SMP_HELPERS
1011 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1013 This enables support for systems with more than one CPU. If you have
1014 a system with only one CPU, like most personal computers, say N. If
1015 you have a system with more than one CPU, say Y.
1017 If you say N here, the kernel will run on single and multiprocessor
1018 machines, but will use only one CPU of a multiprocessor machine. If
1019 you say Y here, the kernel will run on many, but not all, single
1020 processor machines. On a single processor machine, the kernel will
1021 run faster if you say N here.
1023 See also <file:Documentation/i386/IO-APIC.txt>,
1024 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1025 <http://www.linuxdoc.org/docs.html#howto>.
1027 If you don't know what to do here, say N.
1033 This option enables support for the ARM system coherency unit
1039 This options enables support for the ARM timer and watchdog unit
1042 prompt "Memory split"
1045 Select the desired split between kernel and user memory.
1047 If you are not absolutely sure what you are doing, leave this
1051 bool "3G/1G user/kernel split"
1053 bool "2G/2G user/kernel split"
1055 bool "1G/3G user/kernel split"
1060 default 0x40000000 if VMSPLIT_1G
1061 default 0x80000000 if VMSPLIT_2G
1065 int "Maximum number of CPUs (2-32)"
1071 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1072 depends on SMP && HOTPLUG && EXPERIMENTAL
1074 Say Y here to experiment with turning CPUs off and on. CPUs
1075 can be controlled through /sys/devices/system/cpu.
1078 bool "Use local timer interrupts"
1079 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1080 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1082 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1084 Enable support for local timers on SMP platforms, rather then the
1085 legacy IPI broadcast method. Local timers allows the system
1086 accounting to be spread across the timer interval, preventing a
1087 "thundering herd" at every timer tick.
1089 source kernel/Kconfig.preempt
1093 default 128 if ARCH_L7200
1094 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1095 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1096 default AT91_TIMER_HZ if ARCH_AT91
1099 config THUMB2_KERNEL
1100 bool "Compile the kernel in Thumb-2 mode"
1101 depends on CPU_V7 && EXPERIMENTAL
1103 select ARM_ASM_UNIFIED
1105 By enabling this option, the kernel will be compiled in
1106 Thumb-2 mode. A compiler/assembler that understand the unified
1107 ARM-Thumb syntax is needed.
1111 config ARM_ASM_UNIFIED
1115 bool "Use the ARM EABI to compile the kernel"
1117 This option allows for the kernel to be compiled using the latest
1118 ARM ABI (aka EABI). This is only useful if you are using a user
1119 space environment that is also compiled with EABI.
1121 Since there are major incompatibilities between the legacy ABI and
1122 EABI, especially with regard to structure member alignment, this
1123 option also changes the kernel syscall calling convention to
1124 disambiguate both ABIs and allow for backward compatibility support
1125 (selected with CONFIG_OABI_COMPAT).
1127 To use this you need GCC version 4.0.0 or later.
1130 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1131 depends on AEABI && EXPERIMENTAL
1134 This option preserves the old syscall interface along with the
1135 new (ARM EABI) one. It also provides a compatibility layer to
1136 intercept syscalls that have structure arguments which layout
1137 in memory differs between the legacy ABI and the new ARM EABI
1138 (only for non "thumb" binaries). This option adds a tiny
1139 overhead to all syscalls and produces a slightly larger kernel.
1140 If you know you'll be using only pure EABI user space then you
1141 can say N here. If this option is not selected and you attempt
1142 to execute a legacy ABI binary then the result will be
1143 UNPREDICTABLE (in fact it can be predicted that it won't work
1144 at all). If in doubt say Y.
1146 config ARCH_HAS_HOLES_MEMORYMODEL
1149 # Discontigmem is deprecated
1150 config ARCH_DISCONTIGMEM_ENABLE
1153 config ARCH_SPARSEMEM_ENABLE
1156 config ARCH_SPARSEMEM_DEFAULT
1157 def_bool ARCH_SPARSEMEM_ENABLE
1159 config ARCH_SELECT_MEMORY_MODEL
1160 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1164 default "4" if ARCH_LH7A40X
1166 depends on NEED_MULTIPLE_NODES
1169 bool "High Memory Support (EXPERIMENTAL)"
1170 depends on MMU && EXPERIMENTAL
1172 The address space of ARM processors is only 4 Gigabytes large
1173 and it has to accommodate user address space, kernel address
1174 space as well as some memory mapped IO. That means that, if you
1175 have a large amount of physical memory and/or IO, not all of the
1176 memory can be "permanently mapped" by the kernel. The physical
1177 memory that is not permanently mapped is called "high memory".
1179 Depending on the selected kernel/user memory split, minimum
1180 vmalloc space and actual amount of RAM, you may not need this
1181 option which should result in a slightly faster kernel.
1186 bool "Allocate 2nd-level pagetables from highmem"
1188 depends on !OUTER_CACHE
1193 bool "Timer and CPU usage LEDs"
1194 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1195 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1196 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1197 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1198 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1199 ARCH_AT91 || ARCH_DAVINCI || \
1200 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1202 If you say Y here, the LEDs on your machine will be used
1203 to provide useful information about your current system status.
1205 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1206 be able to select which LEDs are active using the options below. If
1207 you are compiling a kernel for the EBSA-110 or the LART however, the
1208 red LED will simply flash regularly to indicate that the system is
1209 still functional. It is safe to say Y here if you have a CATS
1210 system, but the driver will do nothing.
1213 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1214 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1215 || MACH_OMAP_PERSEUS2
1217 depends on !GENERIC_CLOCKEVENTS
1218 default y if ARCH_EBSA110
1220 If you say Y here, one of the system LEDs (the green one on the
1221 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1222 will flash regularly to indicate that the system is still
1223 operational. This is mainly useful to kernel hackers who are
1224 debugging unstable kernels.
1226 The LART uses the same LED for both Timer LED and CPU usage LED
1227 functions. You may choose to use both, but the Timer LED function
1228 will overrule the CPU usage LED.
1231 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1233 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1234 || MACH_OMAP_PERSEUS2
1237 If you say Y here, the red LED will be used to give a good real
1238 time indication of CPU usage, by lighting whenever the idle task
1239 is not currently executing.
1241 The LART uses the same LED for both Timer LED and CPU usage LED
1242 functions. You may choose to use both, but the Timer LED function
1243 will overrule the CPU usage LED.
1245 config ALIGNMENT_TRAP
1247 depends on CPU_CP15_MMU
1248 default y if !ARCH_EBSA110
1249 select HAVE_PROC_CPU if PROC_FS
1251 ARM processors cannot fetch/store information which is not
1252 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1253 address divisible by 4. On 32-bit ARM processors, these non-aligned
1254 fetch/store instructions will be emulated in software if you say
1255 here, which has a severe performance impact. This is necessary for
1256 correct operation of some network protocols. With an IP-only
1257 configuration it is safe to say N, otherwise say Y.
1259 config UACCESS_WITH_MEMCPY
1260 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1261 depends on MMU && EXPERIMENTAL
1262 default y if CPU_FEROCEON
1264 Implement faster copy_to_user and clear_user methods for CPU
1265 cores where a 8-word STM instruction give significantly higher
1266 memory write throughput than a sequence of individual 32bit stores.
1268 A possible side effect is a slight increase in scheduling latency
1269 between threads sharing the same address space if they invoke
1270 such copy operations with large buffers.
1272 However, if the CPU data cache is using a write-allocate mode,
1273 this option is unlikely to provide any performance gain.
1279 # Compressed boot loader in ROM. Yes, we really want to ask about
1280 # TEXT and BSS so we preserve their values in the config files.
1281 config ZBOOT_ROM_TEXT
1282 hex "Compressed ROM boot loader base address"
1285 The physical address at which the ROM-able zImage is to be
1286 placed in the target. Platforms which normally make use of
1287 ROM-able zImage formats normally set this to a suitable
1288 value in their defconfig file.
1290 If ZBOOT_ROM is not enabled, this has no effect.
1292 config ZBOOT_ROM_BSS
1293 hex "Compressed ROM boot loader BSS address"
1296 The base address of an area of read/write memory in the target
1297 for the ROM-able zImage which must be available while the
1298 decompressor is running. It must be large enough to hold the
1299 entire decompressed kernel plus an additional 128 KiB.
1300 Platforms which normally make use of ROM-able zImage formats
1301 normally set this to a suitable value in their defconfig file.
1303 If ZBOOT_ROM is not enabled, this has no effect.
1306 bool "Compressed boot loader in ROM/flash"
1307 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1309 Say Y here if you intend to execute your compressed kernel image
1310 (zImage) directly from ROM or flash. If unsure, say N.
1313 string "Default kernel command string"
1316 On some architectures (EBSA110 and CATS), there is currently no way
1317 for the boot loader to pass arguments to the kernel. For these
1318 architectures, you should supply some command-line options at build
1319 time by entering them here. As a minimum, you should specify the
1320 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1323 bool "Kernel Execute-In-Place from ROM"
1324 depends on !ZBOOT_ROM
1326 Execute-In-Place allows the kernel to run from non-volatile storage
1327 directly addressable by the CPU, such as NOR flash. This saves RAM
1328 space since the text section of the kernel is not loaded from flash
1329 to RAM. Read-write sections, such as the data section and stack,
1330 are still copied to RAM. The XIP kernel is not compressed since
1331 it has to run directly from flash, so it will take more space to
1332 store it. The flash address used to link the kernel object files,
1333 and for storing it, is configuration dependent. Therefore, if you
1334 say Y here, you must know the proper physical address where to
1335 store the kernel image depending on your own flash memory usage.
1337 Also note that the make target becomes "make xipImage" rather than
1338 "make zImage" or "make Image". The final kernel binary to put in
1339 ROM memory will be arch/arm/boot/xipImage.
1343 config XIP_PHYS_ADDR
1344 hex "XIP Kernel Physical Location"
1345 depends on XIP_KERNEL
1346 default "0x00080000"
1348 This is the physical address in your flash memory the kernel will
1349 be linked for and stored to. This address is dependent on your
1353 bool "Kexec system call (EXPERIMENTAL)"
1354 depends on EXPERIMENTAL
1356 kexec is a system call that implements the ability to shutdown your
1357 current kernel, and to start another kernel. It is like a reboot
1358 but it is independent of the system firmware. And like a reboot
1359 you can start any kernel with it, not just Linux.
1361 It is an ongoing process to be certain the hardware in a machine
1362 is properly shutdown, so do not be surprised if this code does not
1363 initially work for you. It may help to enable device hotplugging
1367 bool "Export atags in procfs"
1371 Should the atags used to boot the kernel be exported in an "atags"
1372 file in procfs. Useful with kexec.
1376 menu "CPU Power Management"
1380 source "drivers/cpufreq/Kconfig"
1382 config CPU_FREQ_SA1100
1385 config CPU_FREQ_SA1110
1388 config CPU_FREQ_INTEGRATOR
1389 tristate "CPUfreq driver for ARM Integrator CPUs"
1390 depends on ARCH_INTEGRATOR && CPU_FREQ
1393 This enables the CPUfreq driver for ARM Integrator CPUs.
1395 For details, take a look at <file:Documentation/cpu-freq>.
1401 depends on CPU_FREQ && ARCH_PXA && PXA25x
1403 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1405 config CPU_FREQ_S3C64XX
1406 bool "CPUfreq support for Samsung S3C64XX CPUs"
1407 depends on CPU_FREQ && CPU_S3C6410
1412 Internal configuration node for common cpufreq on Samsung SoC
1414 config CPU_FREQ_S3C24XX
1415 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1416 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1419 This enables the CPUfreq driver for the Samsung S3C24XX family
1422 For details, take a look at <file:Documentation/cpu-freq>.
1426 config CPU_FREQ_S3C24XX_PLL
1427 bool "Support CPUfreq changing of PLL frequency"
1428 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1430 Compile in support for changing the PLL frequency from the
1431 S3C24XX series CPUfreq driver. The PLL takes time to settle
1432 after a frequency change, so by default it is not enabled.
1434 This also means that the PLL tables for the selected CPU(s) will
1435 be built which may increase the size of the kernel image.
1437 config CPU_FREQ_S3C24XX_DEBUG
1438 bool "Debug CPUfreq Samsung driver core"
1439 depends on CPU_FREQ_S3C24XX
1441 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1443 config CPU_FREQ_S3C24XX_IODEBUG
1444 bool "Debug CPUfreq Samsung driver IO timing"
1445 depends on CPU_FREQ_S3C24XX
1447 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1449 config CPU_FREQ_S3C24XX_DEBUGFS
1450 bool "Export debugfs for CPUFreq"
1451 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1453 Export status information via debugfs.
1457 source "drivers/cpuidle/Kconfig"
1461 menu "Floating point emulation"
1463 comment "At least one emulation must be selected"
1466 bool "NWFPE math emulation"
1467 depends on !AEABI || OABI_COMPAT
1469 Say Y to include the NWFPE floating point emulator in the kernel.
1470 This is necessary to run most binaries. Linux does not currently
1471 support floating point hardware so you need to say Y here even if
1472 your machine has an FPA or floating point co-processor podule.
1474 You may say N here if you are going to load the Acorn FPEmulator
1475 early in the bootup.
1478 bool "Support extended precision"
1479 depends on FPE_NWFPE
1481 Say Y to include 80-bit support in the kernel floating-point
1482 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1483 Note that gcc does not generate 80-bit operations by default,
1484 so in most cases this option only enlarges the size of the
1485 floating point emulator without any good reason.
1487 You almost surely want to say N here.
1490 bool "FastFPE math emulation (EXPERIMENTAL)"
1491 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1493 Say Y here to include the FAST floating point emulator in the kernel.
1494 This is an experimental much faster emulator which now also has full
1495 precision for the mantissa. It does not support any exceptions.
1496 It is very simple, and approximately 3-6 times faster than NWFPE.
1498 It should be sufficient for most programs. It may be not suitable
1499 for scientific calculations, but you have to check this for yourself.
1500 If you do not feel you need a faster FP emulation you should better
1504 bool "VFP-format floating point maths"
1505 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1507 Say Y to include VFP support code in the kernel. This is needed
1508 if your hardware includes a VFP unit.
1510 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1511 release notes and additional status information.
1513 Say N if your target does not have VFP hardware.
1521 bool "Advanced SIMD (NEON) Extension support"
1522 depends on VFPv3 && CPU_V7
1524 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1529 menu "Userspace binary formats"
1531 source "fs/Kconfig.binfmt"
1534 tristate "RISC OS personality"
1537 Say Y here to include the kernel code necessary if you want to run
1538 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1539 experimental; if this sounds frightening, say N and sleep in peace.
1540 You can also say M here to compile this support as a module (which
1541 will be called arthur).
1545 menu "Power management options"
1547 source "kernel/power/Kconfig"
1549 config ARCH_SUSPEND_POSSIBLE
1554 source "net/Kconfig"
1556 source "drivers/Kconfig"
1560 source "arch/arm/Kconfig.debug"
1562 source "security/Kconfig"
1564 source "crypto/Kconfig"
1566 source "lib/Kconfig"