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.
929 source "arch/arm/common/Kconfig"
931 config FORCE_MAX_ZONEORDER
944 Find out whether you have ISA slots on your motherboard. ISA is the
945 name of a bus system, i.e. the way the CPU talks to the other stuff
946 inside your box. Other bus systems are PCI, EISA, MicroChannel
947 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
948 newer boards don't support it. If you have ISA, say Y, otherwise N.
950 # Select ISA DMA controller support
955 # Select ISA DMA interface
960 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
962 Find out whether you have a PCI motherboard. PCI is the name of a
963 bus system, i.e. the way the CPU talks to the other stuff inside
964 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
965 VESA. If you have PCI, say Y, otherwise N.
970 # Select the host bridge type
971 config PCI_HOST_VIA82C505
973 depends on PCI && ARCH_SHARK
976 config PCI_HOST_ITE8152
978 depends on PCI && MACH_ARMCORE
982 source "drivers/pci/Kconfig"
984 source "drivers/pcmcia/Kconfig"
988 menu "Kernel Features"
990 source "kernel/time/Kconfig"
993 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
994 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
995 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
996 depends on GENERIC_CLOCKEVENTS
997 select USE_GENERIC_SMP_HELPERS
998 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1000 This enables support for systems with more than one CPU. If you have
1001 a system with only one CPU, like most personal computers, say N. If
1002 you have a system with more than one CPU, say Y.
1004 If you say N here, the kernel will run on single and multiprocessor
1005 machines, but will use only one CPU of a multiprocessor machine. If
1006 you say Y here, the kernel will run on many, but not all, single
1007 processor machines. On a single processor machine, the kernel will
1008 run faster if you say N here.
1010 See also <file:Documentation/i386/IO-APIC.txt>,
1011 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1012 <http://www.linuxdoc.org/docs.html#howto>.
1014 If you don't know what to do here, say N.
1020 This option enables support for the ARM system coherency unit
1026 This options enables support for the ARM timer and watchdog unit
1029 prompt "Memory split"
1032 Select the desired split between kernel and user memory.
1034 If you are not absolutely sure what you are doing, leave this
1038 bool "3G/1G user/kernel split"
1040 bool "2G/2G user/kernel split"
1042 bool "1G/3G user/kernel split"
1047 default 0x40000000 if VMSPLIT_1G
1048 default 0x80000000 if VMSPLIT_2G
1052 int "Maximum number of CPUs (2-32)"
1058 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1059 depends on SMP && HOTPLUG && EXPERIMENTAL
1061 Say Y here to experiment with turning CPUs off and on. CPUs
1062 can be controlled through /sys/devices/system/cpu.
1065 bool "Use local timer interrupts"
1066 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1067 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1069 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1071 Enable support for local timers on SMP platforms, rather then the
1072 legacy IPI broadcast method. Local timers allows the system
1073 accounting to be spread across the timer interval, preventing a
1074 "thundering herd" at every timer tick.
1076 source kernel/Kconfig.preempt
1080 default 128 if ARCH_L7200
1081 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1082 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1083 default AT91_TIMER_HZ if ARCH_AT91
1086 config THUMB2_KERNEL
1087 bool "Compile the kernel in Thumb-2 mode"
1088 depends on CPU_V7 && EXPERIMENTAL
1090 select ARM_ASM_UNIFIED
1092 By enabling this option, the kernel will be compiled in
1093 Thumb-2 mode. A compiler/assembler that understand the unified
1094 ARM-Thumb syntax is needed.
1098 config ARM_ASM_UNIFIED
1102 bool "Use the ARM EABI to compile the kernel"
1104 This option allows for the kernel to be compiled using the latest
1105 ARM ABI (aka EABI). This is only useful if you are using a user
1106 space environment that is also compiled with EABI.
1108 Since there are major incompatibilities between the legacy ABI and
1109 EABI, especially with regard to structure member alignment, this
1110 option also changes the kernel syscall calling convention to
1111 disambiguate both ABIs and allow for backward compatibility support
1112 (selected with CONFIG_OABI_COMPAT).
1114 To use this you need GCC version 4.0.0 or later.
1117 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1118 depends on AEABI && EXPERIMENTAL
1121 This option preserves the old syscall interface along with the
1122 new (ARM EABI) one. It also provides a compatibility layer to
1123 intercept syscalls that have structure arguments which layout
1124 in memory differs between the legacy ABI and the new ARM EABI
1125 (only for non "thumb" binaries). This option adds a tiny
1126 overhead to all syscalls and produces a slightly larger kernel.
1127 If you know you'll be using only pure EABI user space then you
1128 can say N here. If this option is not selected and you attempt
1129 to execute a legacy ABI binary then the result will be
1130 UNPREDICTABLE (in fact it can be predicted that it won't work
1131 at all). If in doubt say Y.
1133 config ARCH_HAS_HOLES_MEMORYMODEL
1136 # Discontigmem is deprecated
1137 config ARCH_DISCONTIGMEM_ENABLE
1140 config ARCH_SPARSEMEM_ENABLE
1143 config ARCH_SPARSEMEM_DEFAULT
1144 def_bool ARCH_SPARSEMEM_ENABLE
1146 config ARCH_SELECT_MEMORY_MODEL
1147 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1151 default "4" if ARCH_LH7A40X
1153 depends on NEED_MULTIPLE_NODES
1156 bool "High Memory Support (EXPERIMENTAL)"
1157 depends on MMU && EXPERIMENTAL
1159 The address space of ARM processors is only 4 Gigabytes large
1160 and it has to accommodate user address space, kernel address
1161 space as well as some memory mapped IO. That means that, if you
1162 have a large amount of physical memory and/or IO, not all of the
1163 memory can be "permanently mapped" by the kernel. The physical
1164 memory that is not permanently mapped is called "high memory".
1166 Depending on the selected kernel/user memory split, minimum
1167 vmalloc space and actual amount of RAM, you may not need this
1168 option which should result in a slightly faster kernel.
1173 bool "Allocate 2nd-level pagetables from highmem"
1175 depends on !OUTER_CACHE
1180 bool "Timer and CPU usage LEDs"
1181 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1182 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1183 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1184 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1185 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1186 ARCH_AT91 || ARCH_DAVINCI || \
1187 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1189 If you say Y here, the LEDs on your machine will be used
1190 to provide useful information about your current system status.
1192 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1193 be able to select which LEDs are active using the options below. If
1194 you are compiling a kernel for the EBSA-110 or the LART however, the
1195 red LED will simply flash regularly to indicate that the system is
1196 still functional. It is safe to say Y here if you have a CATS
1197 system, but the driver will do nothing.
1200 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1201 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1202 || MACH_OMAP_PERSEUS2
1204 depends on !GENERIC_CLOCKEVENTS
1205 default y if ARCH_EBSA110
1207 If you say Y here, one of the system LEDs (the green one on the
1208 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1209 will flash regularly to indicate that the system is still
1210 operational. This is mainly useful to kernel hackers who are
1211 debugging unstable kernels.
1213 The LART uses the same LED for both Timer LED and CPU usage LED
1214 functions. You may choose to use both, but the Timer LED function
1215 will overrule the CPU usage LED.
1218 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1220 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1221 || MACH_OMAP_PERSEUS2
1224 If you say Y here, the red LED will be used to give a good real
1225 time indication of CPU usage, by lighting whenever the idle task
1226 is not currently executing.
1228 The LART uses the same LED for both Timer LED and CPU usage LED
1229 functions. You may choose to use both, but the Timer LED function
1230 will overrule the CPU usage LED.
1232 config ALIGNMENT_TRAP
1234 depends on CPU_CP15_MMU
1235 default y if !ARCH_EBSA110
1236 select HAVE_PROC_CPU if PROC_FS
1238 ARM processors cannot fetch/store information which is not
1239 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1240 address divisible by 4. On 32-bit ARM processors, these non-aligned
1241 fetch/store instructions will be emulated in software if you say
1242 here, which has a severe performance impact. This is necessary for
1243 correct operation of some network protocols. With an IP-only
1244 configuration it is safe to say N, otherwise say Y.
1246 config UACCESS_WITH_MEMCPY
1247 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1248 depends on MMU && EXPERIMENTAL
1249 default y if CPU_FEROCEON
1251 Implement faster copy_to_user and clear_user methods for CPU
1252 cores where a 8-word STM instruction give significantly higher
1253 memory write throughput than a sequence of individual 32bit stores.
1255 A possible side effect is a slight increase in scheduling latency
1256 between threads sharing the same address space if they invoke
1257 such copy operations with large buffers.
1259 However, if the CPU data cache is using a write-allocate mode,
1260 this option is unlikely to provide any performance gain.
1266 # Compressed boot loader in ROM. Yes, we really want to ask about
1267 # TEXT and BSS so we preserve their values in the config files.
1268 config ZBOOT_ROM_TEXT
1269 hex "Compressed ROM boot loader base address"
1272 The physical address at which the ROM-able zImage is to be
1273 placed in the target. Platforms which normally make use of
1274 ROM-able zImage formats normally set this to a suitable
1275 value in their defconfig file.
1277 If ZBOOT_ROM is not enabled, this has no effect.
1279 config ZBOOT_ROM_BSS
1280 hex "Compressed ROM boot loader BSS address"
1283 The base address of an area of read/write memory in the target
1284 for the ROM-able zImage which must be available while the
1285 decompressor is running. It must be large enough to hold the
1286 entire decompressed kernel plus an additional 128 KiB.
1287 Platforms which normally make use of ROM-able zImage formats
1288 normally set this to a suitable value in their defconfig file.
1290 If ZBOOT_ROM is not enabled, this has no effect.
1293 bool "Compressed boot loader in ROM/flash"
1294 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1296 Say Y here if you intend to execute your compressed kernel image
1297 (zImage) directly from ROM or flash. If unsure, say N.
1300 string "Default kernel command string"
1303 On some architectures (EBSA110 and CATS), there is currently no way
1304 for the boot loader to pass arguments to the kernel. For these
1305 architectures, you should supply some command-line options at build
1306 time by entering them here. As a minimum, you should specify the
1307 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1310 bool "Kernel Execute-In-Place from ROM"
1311 depends on !ZBOOT_ROM
1313 Execute-In-Place allows the kernel to run from non-volatile storage
1314 directly addressable by the CPU, such as NOR flash. This saves RAM
1315 space since the text section of the kernel is not loaded from flash
1316 to RAM. Read-write sections, such as the data section and stack,
1317 are still copied to RAM. The XIP kernel is not compressed since
1318 it has to run directly from flash, so it will take more space to
1319 store it. The flash address used to link the kernel object files,
1320 and for storing it, is configuration dependent. Therefore, if you
1321 say Y here, you must know the proper physical address where to
1322 store the kernel image depending on your own flash memory usage.
1324 Also note that the make target becomes "make xipImage" rather than
1325 "make zImage" or "make Image". The final kernel binary to put in
1326 ROM memory will be arch/arm/boot/xipImage.
1330 config XIP_PHYS_ADDR
1331 hex "XIP Kernel Physical Location"
1332 depends on XIP_KERNEL
1333 default "0x00080000"
1335 This is the physical address in your flash memory the kernel will
1336 be linked for and stored to. This address is dependent on your
1340 bool "Kexec system call (EXPERIMENTAL)"
1341 depends on EXPERIMENTAL
1343 kexec is a system call that implements the ability to shutdown your
1344 current kernel, and to start another kernel. It is like a reboot
1345 but it is independent of the system firmware. And like a reboot
1346 you can start any kernel with it, not just Linux.
1348 It is an ongoing process to be certain the hardware in a machine
1349 is properly shutdown, so do not be surprised if this code does not
1350 initially work for you. It may help to enable device hotplugging
1354 bool "Export atags in procfs"
1358 Should the atags used to boot the kernel be exported in an "atags"
1359 file in procfs. Useful with kexec.
1363 menu "CPU Power Management"
1367 source "drivers/cpufreq/Kconfig"
1369 config CPU_FREQ_SA1100
1372 config CPU_FREQ_SA1110
1375 config CPU_FREQ_INTEGRATOR
1376 tristate "CPUfreq driver for ARM Integrator CPUs"
1377 depends on ARCH_INTEGRATOR && CPU_FREQ
1380 This enables the CPUfreq driver for ARM Integrator CPUs.
1382 For details, take a look at <file:Documentation/cpu-freq>.
1388 depends on CPU_FREQ && ARCH_PXA && PXA25x
1390 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1392 config CPU_FREQ_S3C64XX
1393 bool "CPUfreq support for Samsung S3C64XX CPUs"
1394 depends on CPU_FREQ && CPU_S3C6410
1399 Internal configuration node for common cpufreq on Samsung SoC
1401 config CPU_FREQ_S3C24XX
1402 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1403 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1406 This enables the CPUfreq driver for the Samsung S3C24XX family
1409 For details, take a look at <file:Documentation/cpu-freq>.
1413 config CPU_FREQ_S3C24XX_PLL
1414 bool "Support CPUfreq changing of PLL frequency"
1415 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1417 Compile in support for changing the PLL frequency from the
1418 S3C24XX series CPUfreq driver. The PLL takes time to settle
1419 after a frequency change, so by default it is not enabled.
1421 This also means that the PLL tables for the selected CPU(s) will
1422 be built which may increase the size of the kernel image.
1424 config CPU_FREQ_S3C24XX_DEBUG
1425 bool "Debug CPUfreq Samsung driver core"
1426 depends on CPU_FREQ_S3C24XX
1428 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1430 config CPU_FREQ_S3C24XX_IODEBUG
1431 bool "Debug CPUfreq Samsung driver IO timing"
1432 depends on CPU_FREQ_S3C24XX
1434 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1436 config CPU_FREQ_S3C24XX_DEBUGFS
1437 bool "Export debugfs for CPUFreq"
1438 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1440 Export status information via debugfs.
1444 source "drivers/cpuidle/Kconfig"
1448 menu "Floating point emulation"
1450 comment "At least one emulation must be selected"
1453 bool "NWFPE math emulation"
1454 depends on !AEABI || OABI_COMPAT
1456 Say Y to include the NWFPE floating point emulator in the kernel.
1457 This is necessary to run most binaries. Linux does not currently
1458 support floating point hardware so you need to say Y here even if
1459 your machine has an FPA or floating point co-processor podule.
1461 You may say N here if you are going to load the Acorn FPEmulator
1462 early in the bootup.
1465 bool "Support extended precision"
1466 depends on FPE_NWFPE
1468 Say Y to include 80-bit support in the kernel floating-point
1469 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1470 Note that gcc does not generate 80-bit operations by default,
1471 so in most cases this option only enlarges the size of the
1472 floating point emulator without any good reason.
1474 You almost surely want to say N here.
1477 bool "FastFPE math emulation (EXPERIMENTAL)"
1478 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1480 Say Y here to include the FAST floating point emulator in the kernel.
1481 This is an experimental much faster emulator which now also has full
1482 precision for the mantissa. It does not support any exceptions.
1483 It is very simple, and approximately 3-6 times faster than NWFPE.
1485 It should be sufficient for most programs. It may be not suitable
1486 for scientific calculations, but you have to check this for yourself.
1487 If you do not feel you need a faster FP emulation you should better
1491 bool "VFP-format floating point maths"
1492 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1494 Say Y to include VFP support code in the kernel. This is needed
1495 if your hardware includes a VFP unit.
1497 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1498 release notes and additional status information.
1500 Say N if your target does not have VFP hardware.
1508 bool "Advanced SIMD (NEON) Extension support"
1509 depends on VFPv3 && CPU_V7
1511 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1516 menu "Userspace binary formats"
1518 source "fs/Kconfig.binfmt"
1521 tristate "RISC OS personality"
1524 Say Y here to include the kernel code necessary if you want to run
1525 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1526 experimental; if this sounds frightening, say N and sleep in peace.
1527 You can also say M here to compile this support as a module (which
1528 will be called arthur).
1532 menu "Power management options"
1534 source "kernel/power/Kconfig"
1536 config ARCH_SUSPEND_POSSIBLE
1541 source "net/Kconfig"
1543 source "drivers/Kconfig"
1547 source "arch/arm/Kconfig.debug"
1549 source "security/Kconfig"
1551 source "crypto/Kconfig"
1553 source "lib/Kconfig"