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
168 config ARM_L1_CACHE_SHIFT_6
171 Setting ARM L1 cache line size to 64 Bytes.
175 config OPROFILE_ARMV6
177 depends on CPU_V6 && !SMP
178 select OPROFILE_ARM11_CORE
180 config OPROFILE_MPCORE
182 depends on CPU_V6 && SMP
183 select OPROFILE_ARM11_CORE
185 config OPROFILE_ARM11_CORE
188 config OPROFILE_ARMV7
190 depends on CPU_V7 && !SMP
197 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
198 default DRAM_BASE if REMAP_VECTORS_TO_RAM
201 The base address of exception vectors.
203 source "init/Kconfig"
205 source "kernel/Kconfig.freezer"
210 bool "MMU-based Paged Memory Management Support"
213 Select if you want MMU-based virtualised addressing space
214 support by paged memory management. If unsure, say 'Y'.
217 prompt "ARM system type"
218 default ARCH_VERSATILE
221 bool "Agilent AAEC-2000 based"
226 This enables support for systems based on the Agilent AAEC-2000
228 config ARCH_INTEGRATOR
229 bool "ARM Ltd. Integrator family"
231 select ARCH_HAS_CPUFREQ
236 Support for ARM's Integrator platform.
239 bool "ARM Ltd. RealView family"
245 select GENERIC_CLOCKEVENTS
246 select ARCH_WANT_OPTIONAL_GPIOLIB
248 This enables support for ARM Ltd RealView boards.
250 config ARCH_VERSATILE
251 bool "ARM Ltd. Versatile family"
258 select GENERIC_CLOCKEVENTS
259 select ARCH_WANT_OPTIONAL_GPIOLIB
261 This enables support for ARM Ltd Versatile board.
266 select ARCH_REQUIRE_GPIOLIB
269 This enables support for systems based on the Atmel AT91RM9200,
270 AT91SAM9 and AT91CAP9 processors.
273 bool "Cirrus Logic CLPS711x/EP721x-based"
276 Support for Cirrus Logic 711x/721x based boards.
279 bool "Cortina Systems Gemini"
282 select ARCH_REQUIRE_GPIOLIB
284 Support for the Cortina Systems Gemini family SoCs
292 This is an evaluation board for the StrongARM processor available
293 from Digital. It has limited hardware on-board, including an
294 Ethernet interface, two PCMCIA sockets, two serial ports and a
305 select ARCH_REQUIRE_GPIOLIB
306 select ARCH_HAS_HOLES_MEMORYMODEL
308 This enables support for the Cirrus EP93xx series of CPUs.
310 config ARCH_FOOTBRIDGE
315 Support for systems based on the DC21285 companion chip
316 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
319 bool "Freescale MXC/iMX-based"
321 select GENERIC_CLOCKEVENTS
324 select ARCH_REQUIRE_GPIOLIB
327 Support for Freescale MXC/iMX-based family of processors
330 bool "Freescale STMP3xxx"
334 select ARCH_REQUIRE_GPIOLIB
336 select GENERIC_CLOCKEVENTS
338 select USB_ARCH_HAS_EHCI
340 Support for systems based on the Freescale 3xxx CPUs.
343 bool "Hilscher NetX based"
346 select GENERIC_CLOCKEVENTS
349 This enables support for systems based on the Hilscher NetX Soc
352 bool "Hynix HMS720x-based"
356 This enables support for systems based on the Hynix HMS720x
359 bool "STMicroelectronics Nomadik"
366 select GENERIC_CLOCKEVENTS
368 select ARCH_REQUIRE_GPIOLIB
370 Support for the Nomadik platform by ST-Ericsson
378 select ARCH_SUPPORTS_MSI
381 Support for Intel's IOP13XX (XScale) family of processors.
390 select ARCH_REQUIRE_GPIOLIB
392 Support for Intel's 80219 and IOP32X (XScale) family of
402 select ARCH_REQUIRE_GPIOLIB
404 Support for Intel's IOP33X (XScale) family of processors.
412 Support for Intel's IXP23xx (XScale) family of processors.
415 bool "IXP2400/2800-based"
420 Support for Intel's IXP2400/2800 (XScale) family of processors.
428 select GENERIC_CLOCKEVENTS
429 select DMABOUNCE if PCI
431 Support for Intel's IXP4XX (XScale) family of processors.
438 Say Y here if you intend to run this kernel on a LinkUp Systems
439 L7200 Software Development Board which uses an ARM720T processor.
440 Information on this board can be obtained at:
442 <http://www.linkupsys.com/>
444 If you have any questions or comments about the Linux kernel port
445 to this board, send e-mail to <sjhill@cotw.com>.
451 select ARCH_REQUIRE_GPIOLIB
453 select GENERIC_CLOCKEVENTS
456 Support for the Marvell Dove SoC 88AP510
459 bool "Marvell Kirkwood"
463 select ARCH_REQUIRE_GPIOLIB
465 select GENERIC_CLOCKEVENTS
468 Support for the following Marvell Kirkwood series SoCs:
469 88F6180, 88F6192 and 88F6281.
472 bool "Marvell Loki (88RC8480)"
475 select GENERIC_CLOCKEVENTS
478 Support for the Marvell Loki (88RC8480) SoC.
481 bool "Marvell MV78xx0"
485 select ARCH_REQUIRE_GPIOLIB
487 select GENERIC_CLOCKEVENTS
490 Support for the following Marvell MV78xx0 series SoCs:
499 select ARCH_REQUIRE_GPIOLIB
501 select GENERIC_CLOCKEVENTS
504 Support for the following Marvell Orion 5x series SoCs:
505 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
506 Orion-2 (5281), Orion-1-90 (6183).
509 bool "Marvell PXA168/910"
512 select ARCH_REQUIRE_GPIOLIB
516 select GENERIC_CLOCKEVENTS
520 Support for Marvell's PXA168/910 processor line.
523 bool "Micrel/Kendin KS8695"
526 select ARCH_REQUIRE_GPIOLIB
528 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
529 System-on-Chip devices.
532 bool "NetSilicon NS9xxx"
536 select GENERIC_CLOCKEVENTS
539 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
542 <http://www.digi.com/products/microprocessors/index.jsp>
545 bool "Nuvoton W90X900 CPU"
547 select ARCH_REQUIRE_GPIOLIB
552 select GENERIC_CLOCKEVENTS
554 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
555 At present, the w90x900 has been renamed nuc900, regarding
556 the ARM series product line, you can login the following
557 link address to know more.
559 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
560 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
563 bool "Philips Nexperia PNX4008 Mobile"
567 This enables support for Philips PNX4008 mobile platform.
570 bool "PXA2xx/PXA3xx-based"
573 select ARCH_HAS_CPUFREQ
577 select ARCH_REQUIRE_GPIOLIB
579 select GENERIC_CLOCKEVENTS
583 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
589 select GENERIC_CLOCKEVENTS
591 Support for Qualcomm MSM7K based systems. This runs on the ARM11
592 apps processor of the MSM7K and depends on a shared memory
593 interface to the ARM9 modem processor which runs the baseband stack
594 and controls some vital subsystems (clock and power control, etc).
601 select ARCH_MAY_HAVE_PC_FDC
602 select HAVE_PATA_PLATFORM
605 select ARCH_SPARSEMEM_ENABLE
607 On the Acorn Risc-PC, Linux can support the internal IDE disk and
608 CD-ROM interface, serial and parallel port, and the floppy drive.
614 select ARCH_SPARSEMEM_ENABLE
616 select ARCH_HAS_CPUFREQ
620 select GENERIC_CLOCKEVENTS
623 select ARCH_REQUIRE_GPIOLIB
625 Support for StrongARM 11x0 based boards.
628 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
630 select ARCH_HAS_CPUFREQ
633 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
634 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
635 the Samsung SMDK2410 development board (and derivatives).
638 bool "Samsung S3C64XX"
641 select ARCH_HAS_CPUFREQ
643 Samsung S3C64XX series based systems
646 bool "Samsung S5PC1XX"
650 select ARM_L1_CACHE_SHIFT_6
652 Samsung S5PC1XX series based systems
662 Support for the StrongARM based Digital DNARD machine, also known
663 as "Shark" (<http://www.shark-linux.de/shark.html>).
668 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
669 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
671 Say Y here for systems based on one of the Sharp LH7A40X
672 System on a Chip processors. These CPUs include an ARM922T
673 core with a wide array of integrated devices for
674 hand-held and low-power applications.
677 bool "ST-Ericsson U300 Series"
684 select GENERIC_CLOCKEVENTS
689 Support for ST-Ericsson U300 series mobile platforms.
695 select GENERIC_CLOCKEVENTS
697 select ARCH_REQUIRE_GPIOLIB
702 select GENERIC_ALLOCATOR
703 select ARCH_HAS_HOLES_MEMORYMODEL
705 Support for TI's DaVinci platform.
711 select ARCH_REQUIRE_GPIOLIB
712 select ARCH_HAS_CPUFREQ
714 select GENERIC_CLOCKEVENTS
716 Support for TI's OMAP platform (OMAP1 and OMAP2).
719 bool "Broadcom BCMRING"
725 select GENERIC_CLOCKEVENTS
726 select ARCH_WANT_OPTIONAL_GPIOLIB
728 Support for Broadcom's BCMRing platform.
731 bool "ST-Ericsson U8500 Series"
735 select GENERIC_CLOCKEVENTS
738 Support for ST-Ericsson's Ux500 architecture
742 source "arch/arm/mach-clps711x/Kconfig"
744 source "arch/arm/mach-ep93xx/Kconfig"
746 source "arch/arm/mach-footbridge/Kconfig"
748 source "arch/arm/mach-gemini/Kconfig"
750 source "arch/arm/mach-integrator/Kconfig"
752 source "arch/arm/mach-iop32x/Kconfig"
754 source "arch/arm/mach-iop33x/Kconfig"
756 source "arch/arm/mach-iop13xx/Kconfig"
758 source "arch/arm/mach-ixp4xx/Kconfig"
760 source "arch/arm/mach-ixp2000/Kconfig"
762 source "arch/arm/mach-ixp23xx/Kconfig"
764 source "arch/arm/mach-loki/Kconfig"
766 source "arch/arm/mach-mv78xx0/Kconfig"
768 source "arch/arm/mach-pxa/Kconfig"
769 source "arch/arm/plat-pxa/Kconfig"
771 source "arch/arm/mach-mmp/Kconfig"
773 source "arch/arm/mach-sa1100/Kconfig"
775 source "arch/arm/plat-omap/Kconfig"
777 source "arch/arm/mach-omap1/Kconfig"
779 source "arch/arm/mach-omap2/Kconfig"
781 source "arch/arm/mach-orion5x/Kconfig"
783 source "arch/arm/mach-kirkwood/Kconfig"
785 source "arch/arm/mach-dove/Kconfig"
787 source "arch/arm/plat-samsung/Kconfig"
788 source "arch/arm/plat-s3c24xx/Kconfig"
789 source "arch/arm/plat-s3c64xx/Kconfig"
790 source "arch/arm/plat-s3c/Kconfig"
791 source "arch/arm/plat-s5pc1xx/Kconfig"
794 source "arch/arm/mach-s3c2400/Kconfig"
795 source "arch/arm/mach-s3c2410/Kconfig"
796 source "arch/arm/mach-s3c2412/Kconfig"
797 source "arch/arm/mach-s3c2440/Kconfig"
798 source "arch/arm/mach-s3c2442/Kconfig"
799 source "arch/arm/mach-s3c2443/Kconfig"
803 source "arch/arm/mach-s3c6400/Kconfig"
804 source "arch/arm/mach-s3c6410/Kconfig"
807 source "arch/arm/plat-stmp3xxx/Kconfig"
810 source "arch/arm/mach-s5pc100/Kconfig"
813 source "arch/arm/mach-lh7a40x/Kconfig"
815 source "arch/arm/mach-h720x/Kconfig"
817 source "arch/arm/mach-versatile/Kconfig"
819 source "arch/arm/mach-aaec2000/Kconfig"
821 source "arch/arm/mach-realview/Kconfig"
823 source "arch/arm/mach-at91/Kconfig"
825 source "arch/arm/plat-mxc/Kconfig"
827 source "arch/arm/mach-nomadik/Kconfig"
828 source "arch/arm/plat-nomadik/Kconfig"
830 source "arch/arm/mach-netx/Kconfig"
832 source "arch/arm/mach-ns9xxx/Kconfig"
834 source "arch/arm/mach-davinci/Kconfig"
836 source "arch/arm/mach-ks8695/Kconfig"
838 source "arch/arm/mach-msm/Kconfig"
840 source "arch/arm/mach-u300/Kconfig"
842 source "arch/arm/mach-w90x900/Kconfig"
844 source "arch/arm/mach-bcmring/Kconfig"
846 source "arch/arm/mach-ux500/Kconfig"
848 # Definitions to make life easier
854 select GENERIC_CLOCKEVENTS
863 source arch/arm/mm/Kconfig
866 bool "Enable iWMMXt support"
867 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
868 default y if PXA27x || PXA3xx || ARCH_MMP
870 Enable support for iWMMXt context switching at run time if
871 running on a CPU that supports it.
873 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
876 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
880 source "arch/arm/Kconfig-nommu"
883 config ARM_ERRATA_411920
884 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
885 depends on CPU_V6 && !SMP
887 Invalidation of the Instruction Cache operation can
888 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
889 It does not affect the MPCore. This option enables the ARM Ltd.
890 recommended workaround.
892 config ARM_ERRATA_430973
893 bool "ARM errata: Stale prediction on replaced interworking branch"
896 This option enables the workaround for the 430973 Cortex-A8
897 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
898 interworking branch is replaced with another code sequence at the
899 same virtual address, whether due to self-modifying code or virtual
900 to physical address re-mapping, Cortex-A8 does not recover from the
901 stale interworking branch prediction. This results in Cortex-A8
902 executing the new code sequence in the incorrect ARM or Thumb state.
903 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
904 and also flushes the branch target cache at every context switch.
905 Note that setting specific bits in the ACTLR register may not be
906 available in non-secure mode.
908 config ARM_ERRATA_458693
909 bool "ARM errata: Processor deadlock when a false hazard is created"
912 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
913 erratum. For very specific sequences of memory operations, it is
914 possible for a hazard condition intended for a cache line to instead
915 be incorrectly associated with a different cache line. This false
916 hazard might then cause a processor deadlock. The workaround enables
917 the L1 caching of the NEON accesses and disables the PLD instruction
918 in the ACTLR register. Note that setting specific bits in the ACTLR
919 register may not be available in non-secure mode.
921 config ARM_ERRATA_460075
922 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
925 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
926 erratum. Any asynchronous access to the L2 cache may encounter a
927 situation in which recent store transactions to the L2 cache are lost
928 and overwritten with stale memory contents from external memory. The
929 workaround disables the write-allocate mode for the L2 cache via the
930 ACTLR register. Note that setting specific bits in the ACTLR register
931 may not be available in non-secure mode.
933 config PL310_ERRATA_588369
934 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
935 depends on CACHE_L2X0 && ARCH_OMAP4
937 The PL310 L2 cache controller implements three types of Clean &
938 Invalidate maintenance operations: by Physical Address
939 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
940 They are architecturally defined to behave as the execution of a
941 clean operation followed immediately by an invalidate operation,
942 both performing to the same memory location. This functionality
943 is not correctly implemented in PL310 as clean lines are not
944 invalidated as a result of these operations. Note that this errata
945 uses Texas Instrument's secure monitor api.
948 source "arch/arm/common/Kconfig"
950 config FORCE_MAX_ZONEORDER
963 Find out whether you have ISA slots on your motherboard. ISA is the
964 name of a bus system, i.e. the way the CPU talks to the other stuff
965 inside your box. Other bus systems are PCI, EISA, MicroChannel
966 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
967 newer boards don't support it. If you have ISA, say Y, otherwise N.
969 # Select ISA DMA controller support
974 # Select ISA DMA interface
979 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
981 Find out whether you have a PCI motherboard. PCI is the name of a
982 bus system, i.e. the way the CPU talks to the other stuff inside
983 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
984 VESA. If you have PCI, say Y, otherwise N.
989 # Select the host bridge type
990 config PCI_HOST_VIA82C505
992 depends on PCI && ARCH_SHARK
995 config PCI_HOST_ITE8152
997 depends on PCI && MACH_ARMCORE
1001 source "drivers/pci/Kconfig"
1003 source "drivers/pcmcia/Kconfig"
1007 menu "Kernel Features"
1009 source "kernel/time/Kconfig"
1012 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1013 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1014 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1015 depends on GENERIC_CLOCKEVENTS
1016 select USE_GENERIC_SMP_HELPERS
1017 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1019 This enables support for systems with more than one CPU. If you have
1020 a system with only one CPU, like most personal computers, say N. If
1021 you have a system with more than one CPU, say Y.
1023 If you say N here, the kernel will run on single and multiprocessor
1024 machines, but will use only one CPU of a multiprocessor machine. If
1025 you say Y here, the kernel will run on many, but not all, single
1026 processor machines. On a single processor machine, the kernel will
1027 run faster if you say N here.
1029 See also <file:Documentation/i386/IO-APIC.txt>,
1030 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1031 <http://www.linuxdoc.org/docs.html#howto>.
1033 If you don't know what to do here, say N.
1039 This option enables support for the ARM system coherency unit
1045 This options enables support for the ARM timer and watchdog unit
1048 prompt "Memory split"
1051 Select the desired split between kernel and user memory.
1053 If you are not absolutely sure what you are doing, leave this
1057 bool "3G/1G user/kernel split"
1059 bool "2G/2G user/kernel split"
1061 bool "1G/3G user/kernel split"
1066 default 0x40000000 if VMSPLIT_1G
1067 default 0x80000000 if VMSPLIT_2G
1071 int "Maximum number of CPUs (2-32)"
1077 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1078 depends on SMP && HOTPLUG && EXPERIMENTAL
1080 Say Y here to experiment with turning CPUs off and on. CPUs
1081 can be controlled through /sys/devices/system/cpu.
1084 bool "Use local timer interrupts"
1085 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1086 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1088 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1090 Enable support for local timers on SMP platforms, rather then the
1091 legacy IPI broadcast method. Local timers allows the system
1092 accounting to be spread across the timer interval, preventing a
1093 "thundering herd" at every timer tick.
1095 source kernel/Kconfig.preempt
1099 default 128 if ARCH_L7200
1100 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1101 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1102 default AT91_TIMER_HZ if ARCH_AT91
1105 config THUMB2_KERNEL
1106 bool "Compile the kernel in Thumb-2 mode"
1107 depends on CPU_V7 && EXPERIMENTAL
1109 select ARM_ASM_UNIFIED
1111 By enabling this option, the kernel will be compiled in
1112 Thumb-2 mode. A compiler/assembler that understand the unified
1113 ARM-Thumb syntax is needed.
1117 config ARM_ASM_UNIFIED
1121 bool "Use the ARM EABI to compile the kernel"
1123 This option allows for the kernel to be compiled using the latest
1124 ARM ABI (aka EABI). This is only useful if you are using a user
1125 space environment that is also compiled with EABI.
1127 Since there are major incompatibilities between the legacy ABI and
1128 EABI, especially with regard to structure member alignment, this
1129 option also changes the kernel syscall calling convention to
1130 disambiguate both ABIs and allow for backward compatibility support
1131 (selected with CONFIG_OABI_COMPAT).
1133 To use this you need GCC version 4.0.0 or later.
1136 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1137 depends on AEABI && EXPERIMENTAL
1140 This option preserves the old syscall interface along with the
1141 new (ARM EABI) one. It also provides a compatibility layer to
1142 intercept syscalls that have structure arguments which layout
1143 in memory differs between the legacy ABI and the new ARM EABI
1144 (only for non "thumb" binaries). This option adds a tiny
1145 overhead to all syscalls and produces a slightly larger kernel.
1146 If you know you'll be using only pure EABI user space then you
1147 can say N here. If this option is not selected and you attempt
1148 to execute a legacy ABI binary then the result will be
1149 UNPREDICTABLE (in fact it can be predicted that it won't work
1150 at all). If in doubt say Y.
1152 config ARCH_HAS_HOLES_MEMORYMODEL
1155 # Discontigmem is deprecated
1156 config ARCH_DISCONTIGMEM_ENABLE
1159 config ARCH_SPARSEMEM_ENABLE
1162 config ARCH_SPARSEMEM_DEFAULT
1163 def_bool ARCH_SPARSEMEM_ENABLE
1165 config ARCH_SELECT_MEMORY_MODEL
1166 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1170 default "4" if ARCH_LH7A40X
1172 depends on NEED_MULTIPLE_NODES
1175 bool "High Memory Support (EXPERIMENTAL)"
1176 depends on MMU && EXPERIMENTAL
1178 The address space of ARM processors is only 4 Gigabytes large
1179 and it has to accommodate user address space, kernel address
1180 space as well as some memory mapped IO. That means that, if you
1181 have a large amount of physical memory and/or IO, not all of the
1182 memory can be "permanently mapped" by the kernel. The physical
1183 memory that is not permanently mapped is called "high memory".
1185 Depending on the selected kernel/user memory split, minimum
1186 vmalloc space and actual amount of RAM, you may not need this
1187 option which should result in a slightly faster kernel.
1192 bool "Allocate 2nd-level pagetables from highmem"
1194 depends on !OUTER_CACHE
1199 bool "Timer and CPU usage LEDs"
1200 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1201 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1202 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1203 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1204 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1205 ARCH_AT91 || ARCH_DAVINCI || \
1206 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1208 If you say Y here, the LEDs on your machine will be used
1209 to provide useful information about your current system status.
1211 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1212 be able to select which LEDs are active using the options below. If
1213 you are compiling a kernel for the EBSA-110 or the LART however, the
1214 red LED will simply flash regularly to indicate that the system is
1215 still functional. It is safe to say Y here if you have a CATS
1216 system, but the driver will do nothing.
1219 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1220 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1221 || MACH_OMAP_PERSEUS2
1223 depends on !GENERIC_CLOCKEVENTS
1224 default y if ARCH_EBSA110
1226 If you say Y here, one of the system LEDs (the green one on the
1227 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1228 will flash regularly to indicate that the system is still
1229 operational. This is mainly useful to kernel hackers who are
1230 debugging unstable kernels.
1232 The LART uses the same LED for both Timer LED and CPU usage LED
1233 functions. You may choose to use both, but the Timer LED function
1234 will overrule the CPU usage LED.
1237 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1239 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1240 || MACH_OMAP_PERSEUS2
1243 If you say Y here, the red LED will be used to give a good real
1244 time indication of CPU usage, by lighting whenever the idle task
1245 is not currently executing.
1247 The LART uses the same LED for both Timer LED and CPU usage LED
1248 functions. You may choose to use both, but the Timer LED function
1249 will overrule the CPU usage LED.
1251 config ALIGNMENT_TRAP
1253 depends on CPU_CP15_MMU
1254 default y if !ARCH_EBSA110
1255 select HAVE_PROC_CPU if PROC_FS
1257 ARM processors cannot fetch/store information which is not
1258 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1259 address divisible by 4. On 32-bit ARM processors, these non-aligned
1260 fetch/store instructions will be emulated in software if you say
1261 here, which has a severe performance impact. This is necessary for
1262 correct operation of some network protocols. With an IP-only
1263 configuration it is safe to say N, otherwise say Y.
1265 config UACCESS_WITH_MEMCPY
1266 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1267 depends on MMU && EXPERIMENTAL
1268 default y if CPU_FEROCEON
1270 Implement faster copy_to_user and clear_user methods for CPU
1271 cores where a 8-word STM instruction give significantly higher
1272 memory write throughput than a sequence of individual 32bit stores.
1274 A possible side effect is a slight increase in scheduling latency
1275 between threads sharing the same address space if they invoke
1276 such copy operations with large buffers.
1278 However, if the CPU data cache is using a write-allocate mode,
1279 this option is unlikely to provide any performance gain.
1285 # Compressed boot loader in ROM. Yes, we really want to ask about
1286 # TEXT and BSS so we preserve their values in the config files.
1287 config ZBOOT_ROM_TEXT
1288 hex "Compressed ROM boot loader base address"
1291 The physical address at which the ROM-able zImage is to be
1292 placed in the target. Platforms which normally make use of
1293 ROM-able zImage formats normally set this to a suitable
1294 value in their defconfig file.
1296 If ZBOOT_ROM is not enabled, this has no effect.
1298 config ZBOOT_ROM_BSS
1299 hex "Compressed ROM boot loader BSS address"
1302 The base address of an area of read/write memory in the target
1303 for the ROM-able zImage which must be available while the
1304 decompressor is running. It must be large enough to hold the
1305 entire decompressed kernel plus an additional 128 KiB.
1306 Platforms which normally make use of ROM-able zImage formats
1307 normally set this to a suitable value in their defconfig file.
1309 If ZBOOT_ROM is not enabled, this has no effect.
1312 bool "Compressed boot loader in ROM/flash"
1313 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1315 Say Y here if you intend to execute your compressed kernel image
1316 (zImage) directly from ROM or flash. If unsure, say N.
1319 string "Default kernel command string"
1322 On some architectures (EBSA110 and CATS), there is currently no way
1323 for the boot loader to pass arguments to the kernel. For these
1324 architectures, you should supply some command-line options at build
1325 time by entering them here. As a minimum, you should specify the
1326 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1329 bool "Kernel Execute-In-Place from ROM"
1330 depends on !ZBOOT_ROM
1332 Execute-In-Place allows the kernel to run from non-volatile storage
1333 directly addressable by the CPU, such as NOR flash. This saves RAM
1334 space since the text section of the kernel is not loaded from flash
1335 to RAM. Read-write sections, such as the data section and stack,
1336 are still copied to RAM. The XIP kernel is not compressed since
1337 it has to run directly from flash, so it will take more space to
1338 store it. The flash address used to link the kernel object files,
1339 and for storing it, is configuration dependent. Therefore, if you
1340 say Y here, you must know the proper physical address where to
1341 store the kernel image depending on your own flash memory usage.
1343 Also note that the make target becomes "make xipImage" rather than
1344 "make zImage" or "make Image". The final kernel binary to put in
1345 ROM memory will be arch/arm/boot/xipImage.
1349 config XIP_PHYS_ADDR
1350 hex "XIP Kernel Physical Location"
1351 depends on XIP_KERNEL
1352 default "0x00080000"
1354 This is the physical address in your flash memory the kernel will
1355 be linked for and stored to. This address is dependent on your
1359 bool "Kexec system call (EXPERIMENTAL)"
1360 depends on EXPERIMENTAL
1362 kexec is a system call that implements the ability to shutdown your
1363 current kernel, and to start another kernel. It is like a reboot
1364 but it is independent of the system firmware. And like a reboot
1365 you can start any kernel with it, not just Linux.
1367 It is an ongoing process to be certain the hardware in a machine
1368 is properly shutdown, so do not be surprised if this code does not
1369 initially work for you. It may help to enable device hotplugging
1373 bool "Export atags in procfs"
1377 Should the atags used to boot the kernel be exported in an "atags"
1378 file in procfs. Useful with kexec.
1382 menu "CPU Power Management"
1386 source "drivers/cpufreq/Kconfig"
1388 config CPU_FREQ_SA1100
1391 config CPU_FREQ_SA1110
1394 config CPU_FREQ_INTEGRATOR
1395 tristate "CPUfreq driver for ARM Integrator CPUs"
1396 depends on ARCH_INTEGRATOR && CPU_FREQ
1399 This enables the CPUfreq driver for ARM Integrator CPUs.
1401 For details, take a look at <file:Documentation/cpu-freq>.
1407 depends on CPU_FREQ && ARCH_PXA && PXA25x
1409 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1411 config CPU_FREQ_S3C64XX
1412 bool "CPUfreq support for Samsung S3C64XX CPUs"
1413 depends on CPU_FREQ && CPU_S3C6410
1418 Internal configuration node for common cpufreq on Samsung SoC
1420 config CPU_FREQ_S3C24XX
1421 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1422 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1425 This enables the CPUfreq driver for the Samsung S3C24XX family
1428 For details, take a look at <file:Documentation/cpu-freq>.
1432 config CPU_FREQ_S3C24XX_PLL
1433 bool "Support CPUfreq changing of PLL frequency"
1434 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1436 Compile in support for changing the PLL frequency from the
1437 S3C24XX series CPUfreq driver. The PLL takes time to settle
1438 after a frequency change, so by default it is not enabled.
1440 This also means that the PLL tables for the selected CPU(s) will
1441 be built which may increase the size of the kernel image.
1443 config CPU_FREQ_S3C24XX_DEBUG
1444 bool "Debug CPUfreq Samsung driver core"
1445 depends on CPU_FREQ_S3C24XX
1447 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1449 config CPU_FREQ_S3C24XX_IODEBUG
1450 bool "Debug CPUfreq Samsung driver IO timing"
1451 depends on CPU_FREQ_S3C24XX
1453 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1455 config CPU_FREQ_S3C24XX_DEBUGFS
1456 bool "Export debugfs for CPUFreq"
1457 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1459 Export status information via debugfs.
1463 source "drivers/cpuidle/Kconfig"
1467 menu "Floating point emulation"
1469 comment "At least one emulation must be selected"
1472 bool "NWFPE math emulation"
1473 depends on !AEABI || OABI_COMPAT
1475 Say Y to include the NWFPE floating point emulator in the kernel.
1476 This is necessary to run most binaries. Linux does not currently
1477 support floating point hardware so you need to say Y here even if
1478 your machine has an FPA or floating point co-processor podule.
1480 You may say N here if you are going to load the Acorn FPEmulator
1481 early in the bootup.
1484 bool "Support extended precision"
1485 depends on FPE_NWFPE
1487 Say Y to include 80-bit support in the kernel floating-point
1488 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1489 Note that gcc does not generate 80-bit operations by default,
1490 so in most cases this option only enlarges the size of the
1491 floating point emulator without any good reason.
1493 You almost surely want to say N here.
1496 bool "FastFPE math emulation (EXPERIMENTAL)"
1497 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1499 Say Y here to include the FAST floating point emulator in the kernel.
1500 This is an experimental much faster emulator which now also has full
1501 precision for the mantissa. It does not support any exceptions.
1502 It is very simple, and approximately 3-6 times faster than NWFPE.
1504 It should be sufficient for most programs. It may be not suitable
1505 for scientific calculations, but you have to check this for yourself.
1506 If you do not feel you need a faster FP emulation you should better
1510 bool "VFP-format floating point maths"
1511 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1513 Say Y to include VFP support code in the kernel. This is needed
1514 if your hardware includes a VFP unit.
1516 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1517 release notes and additional status information.
1519 Say N if your target does not have VFP hardware.
1527 bool "Advanced SIMD (NEON) Extension support"
1528 depends on VFPv3 && CPU_V7
1530 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1535 menu "Userspace binary formats"
1537 source "fs/Kconfig.binfmt"
1540 tristate "RISC OS personality"
1543 Say Y here to include the kernel code necessary if you want to run
1544 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1545 experimental; if this sounds frightening, say N and sleep in peace.
1546 You can also say M here to compile this support as a module (which
1547 will be called arthur).
1551 menu "Power management options"
1553 source "kernel/power/Kconfig"
1555 config ARCH_SUSPEND_POSSIBLE
1560 source "net/Kconfig"
1562 source "drivers/Kconfig"
1566 source "arch/arm/Kconfig.debug"
1568 source "security/Kconfig"
1570 source "crypto/Kconfig"
1572 source "lib/Kconfig"