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
17 select HAVE_KPROBES if (!XIP_KERNEL)
18 select HAVE_KRETPROBES if (HAVE_KPROBES)
19 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
20 select HAVE_GENERIC_DMA_COHERENT
21 select HAVE_KERNEL_GZIP
22 select HAVE_KERNEL_LZO
24 The ARM series is a line of low-power-consumption RISC chip designs
25 licensed by ARM Ltd and targeted at embedded applications and
26 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
27 manufactured, but legacy ARM-based PC hardware remains popular in
28 Europe. There is an ARM Linux project with a web page at
29 <http://www.arm.linux.org.uk/>.
34 config SYS_SUPPORTS_APM_EMULATION
43 config GENERIC_CLOCKEVENTS
46 config GENERIC_CLOCKEVENTS_BROADCAST
48 depends on GENERIC_CLOCKEVENTS
49 default y if SMP && !LOCAL_TIMERS
53 select GENERIC_ALLOCATOR
61 The Extended Industry Standard Architecture (EISA) bus was
62 developed as an open alternative to the IBM MicroChannel bus.
64 The EISA bus provided some of the features of the IBM MicroChannel
65 bus while maintaining backward compatibility with cards made for
66 the older ISA bus. The EISA bus saw limited use between 1988 and
67 1995 when it was made obsolete by the PCI bus.
69 Say Y here if you are building a kernel for an EISA-based machine.
79 MicroChannel Architecture is found in some IBM PS/2 machines and
80 laptops. It is a bus system similar to PCI or ISA. See
81 <file:Documentation/mca.txt> (and especially the web page given
82 there) before attempting to build an MCA bus kernel.
84 config GENERIC_HARDIRQS
88 config STACKTRACE_SUPPORT
92 config HAVE_LATENCYTOP_SUPPORT
97 config LOCKDEP_SUPPORT
101 config TRACE_IRQFLAGS_SUPPORT
105 config HARDIRQS_SW_RESEND
109 config GENERIC_IRQ_PROBE
113 config GENERIC_LOCKBREAK
116 depends on SMP && PREEMPT
118 config RWSEM_GENERIC_SPINLOCK
122 config RWSEM_XCHGADD_ALGORITHM
125 config ARCH_HAS_ILOG2_U32
128 config ARCH_HAS_ILOG2_U64
131 config ARCH_HAS_CPUFREQ
134 Internal node to signify that the ARCH has CPUFREQ support
135 and that the relevant menu configurations are displayed for
138 config GENERIC_HWEIGHT
142 config GENERIC_CALIBRATE_DELAY
146 config ARCH_MAY_HAVE_PC_FDC
152 config GENERIC_ISA_DMA
161 config GENERIC_HARDIRQS_NO__DO_IRQ
166 config OPROFILE_ARMV6
168 depends on CPU_V6 && !SMP
169 select OPROFILE_ARM11_CORE
171 config OPROFILE_MPCORE
173 depends on CPU_V6 && SMP
174 select OPROFILE_ARM11_CORE
176 config OPROFILE_ARM11_CORE
179 config OPROFILE_ARMV7
181 depends on CPU_V7 && !SMP
188 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
189 default DRAM_BASE if REMAP_VECTORS_TO_RAM
192 The base address of exception vectors.
194 source "init/Kconfig"
196 source "kernel/Kconfig.freezer"
201 bool "MMU-based Paged Memory Management Support"
204 Select if you want MMU-based virtualised addressing space
205 support by paged memory management. If unsure, say 'Y'.
208 prompt "ARM system type"
209 default ARCH_VERSATILE
212 bool "Agilent AAEC-2000 based"
217 This enables support for systems based on the Agilent AAEC-2000
219 config ARCH_INTEGRATOR
220 bool "ARM Ltd. Integrator family"
222 select ARCH_HAS_CPUFREQ
227 Support for ARM's Integrator platform.
230 bool "ARM Ltd. RealView family"
236 select GENERIC_CLOCKEVENTS
237 select ARCH_WANT_OPTIONAL_GPIOLIB
239 This enables support for ARM Ltd RealView boards.
241 config ARCH_VERSATILE
242 bool "ARM Ltd. Versatile family"
249 select GENERIC_CLOCKEVENTS
250 select ARCH_WANT_OPTIONAL_GPIOLIB
252 This enables support for ARM Ltd Versatile board.
257 select ARCH_REQUIRE_GPIOLIB
260 This enables support for systems based on the Atmel AT91RM9200,
261 AT91SAM9 and AT91CAP9 processors.
264 bool "Cirrus Logic CLPS711x/EP721x-based"
267 Support for Cirrus Logic 711x/721x based boards.
270 bool "Cortina Systems Gemini"
273 select ARCH_REQUIRE_GPIOLIB
275 Support for the Cortina Systems Gemini family SoCs
283 This is an evaluation board for the StrongARM processor available
284 from Digital. It has limited hardware on-board, including an
285 Ethernet interface, two PCMCIA sockets, two serial ports and a
296 select ARCH_REQUIRE_GPIOLIB
297 select ARCH_HAS_HOLES_MEMORYMODEL
299 This enables support for the Cirrus EP93xx series of CPUs.
301 config ARCH_FOOTBRIDGE
306 Support for systems based on the DC21285 companion chip
307 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
310 bool "Freescale MXC/iMX-based"
312 select GENERIC_CLOCKEVENTS
315 select ARCH_REQUIRE_GPIOLIB
318 Support for Freescale MXC/iMX-based family of processors
321 bool "Freescale STMP3xxx"
325 select ARCH_REQUIRE_GPIOLIB
327 select GENERIC_CLOCKEVENTS
329 select USB_ARCH_HAS_EHCI
331 Support for systems based on the Freescale 3xxx CPUs.
334 bool "Hilscher NetX based"
337 select GENERIC_CLOCKEVENTS
340 This enables support for systems based on the Hilscher NetX Soc
343 bool "Hynix HMS720x-based"
347 This enables support for systems based on the Hynix HMS720x
350 bool "STMicroelectronics Nomadik"
357 select GENERIC_CLOCKEVENTS
359 select ARCH_REQUIRE_GPIOLIB
361 Support for the Nomadik platform by ST-Ericsson
369 select ARCH_SUPPORTS_MSI
372 Support for Intel's IOP13XX (XScale) family of processors.
381 select ARCH_REQUIRE_GPIOLIB
383 Support for Intel's 80219 and IOP32X (XScale) family of
393 select ARCH_REQUIRE_GPIOLIB
395 Support for Intel's IOP33X (XScale) family of processors.
403 Support for Intel's IXP23xx (XScale) family of processors.
406 bool "IXP2400/2800-based"
411 Support for Intel's IXP2400/2800 (XScale) family of processors.
419 select GENERIC_CLOCKEVENTS
420 select DMABOUNCE if PCI
422 Support for Intel's IXP4XX (XScale) family of processors.
429 Say Y here if you intend to run this kernel on a LinkUp Systems
430 L7200 Software Development Board which uses an ARM720T processor.
431 Information on this board can be obtained at:
433 <http://www.linkupsys.com/>
435 If you have any questions or comments about the Linux kernel port
436 to this board, send e-mail to <sjhill@cotw.com>.
442 select ARCH_REQUIRE_GPIOLIB
444 select GENERIC_CLOCKEVENTS
447 Support for the Marvell Dove SoC 88AP510
450 bool "Marvell Kirkwood"
454 select ARCH_REQUIRE_GPIOLIB
456 select GENERIC_CLOCKEVENTS
459 Support for the following Marvell Kirkwood series SoCs:
460 88F6180, 88F6192 and 88F6281.
463 bool "Marvell Loki (88RC8480)"
466 select GENERIC_CLOCKEVENTS
469 Support for the Marvell Loki (88RC8480) SoC.
472 bool "Marvell MV78xx0"
476 select ARCH_REQUIRE_GPIOLIB
478 select GENERIC_CLOCKEVENTS
481 Support for the following Marvell MV78xx0 series SoCs:
490 select ARCH_REQUIRE_GPIOLIB
492 select GENERIC_CLOCKEVENTS
495 Support for the following Marvell Orion 5x series SoCs:
496 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
497 Orion-2 (5281), Orion-1-90 (6183).
500 bool "Marvell PXA168/910"
503 select ARCH_REQUIRE_GPIOLIB
507 select GENERIC_CLOCKEVENTS
511 Support for Marvell's PXA168/910 processor line.
514 bool "Micrel/Kendin KS8695"
517 select ARCH_REQUIRE_GPIOLIB
519 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
520 System-on-Chip devices.
523 bool "NetSilicon NS9xxx"
527 select GENERIC_CLOCKEVENTS
530 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
533 <http://www.digi.com/products/microprocessors/index.jsp>
536 bool "Nuvoton W90X900 CPU"
538 select ARCH_REQUIRE_GPIOLIB
543 select GENERIC_CLOCKEVENTS
545 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
546 At present, the w90x900 has been renamed nuc900, regarding
547 the ARM series product line, you can login the following
548 link address to know more.
550 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
551 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
554 bool "Philips Nexperia PNX4008 Mobile"
558 This enables support for Philips PNX4008 mobile platform.
561 bool "PXA2xx/PXA3xx-based"
564 select ARCH_HAS_CPUFREQ
568 select ARCH_REQUIRE_GPIOLIB
570 select GENERIC_CLOCKEVENTS
574 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
580 select GENERIC_CLOCKEVENTS
582 Support for Qualcomm MSM7K based systems. This runs on the ARM11
583 apps processor of the MSM7K and depends on a shared memory
584 interface to the ARM9 modem processor which runs the baseband stack
585 and controls some vital subsystems (clock and power control, etc).
592 select ARCH_MAY_HAVE_PC_FDC
593 select HAVE_PATA_PLATFORM
596 select ARCH_SPARSEMEM_ENABLE
598 On the Acorn Risc-PC, Linux can support the internal IDE disk and
599 CD-ROM interface, serial and parallel port, and the floppy drive.
605 select ARCH_SPARSEMEM_ENABLE
607 select ARCH_HAS_CPUFREQ
611 select GENERIC_CLOCKEVENTS
614 select ARCH_REQUIRE_GPIOLIB
616 Support for StrongARM 11x0 based boards.
619 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
621 select ARCH_HAS_CPUFREQ
624 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
625 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
626 the Samsung SMDK2410 development board (and derivatives).
629 bool "Samsung S3C64XX"
632 select ARCH_HAS_CPUFREQ
634 Samsung S3C64XX series based systems
637 bool "Samsung S5PC1XX"
642 Samsung S5PC1XX series based systems
652 Support for the StrongARM based Digital DNARD machine, also known
653 as "Shark" (<http://www.shark-linux.de/shark.html>).
658 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
659 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
661 Say Y here for systems based on one of the Sharp LH7A40X
662 System on a Chip processors. These CPUs include an ARM922T
663 core with a wide array of integrated devices for
664 hand-held and low-power applications.
667 bool "ST-Ericsson U300 Series"
674 select GENERIC_CLOCKEVENTS
679 Support for ST-Ericsson U300 series mobile platforms.
685 select GENERIC_CLOCKEVENTS
687 select ARCH_REQUIRE_GPIOLIB
692 select GENERIC_ALLOCATOR
693 select ARCH_HAS_HOLES_MEMORYMODEL
695 Support for TI's DaVinci platform.
701 select ARCH_REQUIRE_GPIOLIB
702 select ARCH_HAS_CPUFREQ
704 select GENERIC_CLOCKEVENTS
706 Support for TI's OMAP platform (OMAP1 and OMAP2).
709 bool "Broadcom BCMRING"
715 select GENERIC_CLOCKEVENTS
716 select ARCH_WANT_OPTIONAL_GPIOLIB
718 Support for Broadcom's BCMRing platform.
721 bool "ST-Ericsson U8500 Series"
725 select GENERIC_CLOCKEVENTS
728 Support for ST-Ericsson's Ux500 architecture
732 source "arch/arm/mach-aaec2000/Kconfig"
734 source "arch/arm/mach-at91/Kconfig"
736 source "arch/arm/mach-bcmring/Kconfig"
738 source "arch/arm/mach-clps711x/Kconfig"
740 source "arch/arm/mach-davinci/Kconfig"
742 source "arch/arm/mach-dove/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-h720x/Kconfig"
752 source "arch/arm/mach-integrator/Kconfig"
754 source "arch/arm/mach-iop32x/Kconfig"
756 source "arch/arm/mach-iop33x/Kconfig"
758 source "arch/arm/mach-iop13xx/Kconfig"
760 source "arch/arm/mach-ixp4xx/Kconfig"
762 source "arch/arm/mach-ixp2000/Kconfig"
764 source "arch/arm/mach-ixp23xx/Kconfig"
766 source "arch/arm/mach-kirkwood/Kconfig"
768 source "arch/arm/mach-ks8695/Kconfig"
770 source "arch/arm/mach-lh7a40x/Kconfig"
772 source "arch/arm/mach-loki/Kconfig"
774 source "arch/arm/mach-msm/Kconfig"
776 source "arch/arm/mach-mv78xx0/Kconfig"
778 source "arch/arm/plat-mxc/Kconfig"
780 source "arch/arm/mach-netx/Kconfig"
782 source "arch/arm/mach-nomadik/Kconfig"
783 source "arch/arm/plat-nomadik/Kconfig"
785 source "arch/arm/mach-ns9xxx/Kconfig"
787 source "arch/arm/plat-omap/Kconfig"
789 source "arch/arm/mach-omap1/Kconfig"
791 source "arch/arm/mach-omap2/Kconfig"
793 source "arch/arm/mach-orion5x/Kconfig"
795 source "arch/arm/mach-pxa/Kconfig"
796 source "arch/arm/plat-pxa/Kconfig"
798 source "arch/arm/mach-mmp/Kconfig"
800 source "arch/arm/mach-realview/Kconfig"
802 source "arch/arm/mach-sa1100/Kconfig"
804 source "arch/arm/plat-samsung/Kconfig"
805 source "arch/arm/plat-s3c24xx/Kconfig"
806 source "arch/arm/plat-s3c64xx/Kconfig"
807 source "arch/arm/plat-s3c/Kconfig"
808 source "arch/arm/plat-s5pc1xx/Kconfig"
811 source "arch/arm/mach-s3c2400/Kconfig"
812 source "arch/arm/mach-s3c2410/Kconfig"
813 source "arch/arm/mach-s3c2412/Kconfig"
814 source "arch/arm/mach-s3c2440/Kconfig"
815 source "arch/arm/mach-s3c2442/Kconfig"
816 source "arch/arm/mach-s3c2443/Kconfig"
820 source "arch/arm/mach-s3c6400/Kconfig"
821 source "arch/arm/mach-s3c6410/Kconfig"
824 source "arch/arm/plat-stmp3xxx/Kconfig"
827 source "arch/arm/mach-s5pc100/Kconfig"
830 source "arch/arm/mach-u300/Kconfig"
832 source "arch/arm/mach-ux500/Kconfig"
834 source "arch/arm/mach-versatile/Kconfig"
836 source "arch/arm/mach-w90x900/Kconfig"
838 # Definitions to make life easier
844 select GENERIC_CLOCKEVENTS
853 source arch/arm/mm/Kconfig
856 bool "Enable iWMMXt support"
857 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
858 default y if PXA27x || PXA3xx || ARCH_MMP
860 Enable support for iWMMXt context switching at run time if
861 running on a CPU that supports it.
863 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
866 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
870 source "arch/arm/Kconfig-nommu"
873 config ARM_ERRATA_411920
874 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
875 depends on CPU_V6 && !SMP
877 Invalidation of the Instruction Cache operation can
878 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
879 It does not affect the MPCore. This option enables the ARM Ltd.
880 recommended workaround.
882 config ARM_ERRATA_430973
883 bool "ARM errata: Stale prediction on replaced interworking branch"
886 This option enables the workaround for the 430973 Cortex-A8
887 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
888 interworking branch is replaced with another code sequence at the
889 same virtual address, whether due to self-modifying code or virtual
890 to physical address re-mapping, Cortex-A8 does not recover from the
891 stale interworking branch prediction. This results in Cortex-A8
892 executing the new code sequence in the incorrect ARM or Thumb state.
893 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
894 and also flushes the branch target cache at every context switch.
895 Note that setting specific bits in the ACTLR register may not be
896 available in non-secure mode.
898 config ARM_ERRATA_458693
899 bool "ARM errata: Processor deadlock when a false hazard is created"
902 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
903 erratum. For very specific sequences of memory operations, it is
904 possible for a hazard condition intended for a cache line to instead
905 be incorrectly associated with a different cache line. This false
906 hazard might then cause a processor deadlock. The workaround enables
907 the L1 caching of the NEON accesses and disables the PLD instruction
908 in the ACTLR register. Note that setting specific bits in the ACTLR
909 register may not be available in non-secure mode.
911 config ARM_ERRATA_460075
912 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
915 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
916 erratum. Any asynchronous access to the L2 cache may encounter a
917 situation in which recent store transactions to the L2 cache are lost
918 and overwritten with stale memory contents from external memory. The
919 workaround disables the write-allocate mode for the L2 cache via the
920 ACTLR register. Note that setting specific bits in the ACTLR register
921 may not be available in non-secure mode.
925 source "arch/arm/common/Kconfig"
927 config FORCE_MAX_ZONEORDER
940 Find out whether you have ISA slots on your motherboard. ISA is the
941 name of a bus system, i.e. the way the CPU talks to the other stuff
942 inside your box. Other bus systems are PCI, EISA, MicroChannel
943 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
944 newer boards don't support it. If you have ISA, say Y, otherwise N.
946 # Select ISA DMA controller support
951 # Select ISA DMA interface
956 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
958 Find out whether you have a PCI motherboard. PCI is the name of a
959 bus system, i.e. the way the CPU talks to the other stuff inside
960 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
961 VESA. If you have PCI, say Y, otherwise N.
966 # Select the host bridge type
967 config PCI_HOST_VIA82C505
969 depends on PCI && ARCH_SHARK
972 config PCI_HOST_ITE8152
974 depends on PCI && MACH_ARMCORE
978 source "drivers/pci/Kconfig"
980 source "drivers/pcmcia/Kconfig"
984 menu "Kernel Features"
986 source "kernel/time/Kconfig"
989 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
990 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
991 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
992 depends on GENERIC_CLOCKEVENTS
993 select USE_GENERIC_SMP_HELPERS
994 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
996 This enables support for systems with more than one CPU. If you have
997 a system with only one CPU, like most personal computers, say N. If
998 you have a system with more than one CPU, say Y.
1000 If you say N here, the kernel will run on single and multiprocessor
1001 machines, but will use only one CPU of a multiprocessor machine. If
1002 you say Y here, the kernel will run on many, but not all, single
1003 processor machines. On a single processor machine, the kernel will
1004 run faster if you say N here.
1006 See also <file:Documentation/i386/IO-APIC.txt>,
1007 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1008 <http://www.linuxdoc.org/docs.html#howto>.
1010 If you don't know what to do here, say N.
1016 This option enables support for the ARM system coherency unit
1022 This options enables support for the ARM timer and watchdog unit
1025 prompt "Memory split"
1028 Select the desired split between kernel and user memory.
1030 If you are not absolutely sure what you are doing, leave this
1034 bool "3G/1G user/kernel split"
1036 bool "2G/2G user/kernel split"
1038 bool "1G/3G user/kernel split"
1043 default 0x40000000 if VMSPLIT_1G
1044 default 0x80000000 if VMSPLIT_2G
1048 int "Maximum number of CPUs (2-32)"
1054 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1055 depends on SMP && HOTPLUG && EXPERIMENTAL
1057 Say Y here to experiment with turning CPUs off and on. CPUs
1058 can be controlled through /sys/devices/system/cpu.
1061 bool "Use local timer interrupts"
1062 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1063 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1065 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1067 Enable support for local timers on SMP platforms, rather then the
1068 legacy IPI broadcast method. Local timers allows the system
1069 accounting to be spread across the timer interval, preventing a
1070 "thundering herd" at every timer tick.
1072 source kernel/Kconfig.preempt
1076 default 128 if ARCH_L7200
1077 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1078 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1079 default AT91_TIMER_HZ if ARCH_AT91
1082 config THUMB2_KERNEL
1083 bool "Compile the kernel in Thumb-2 mode"
1084 depends on CPU_V7 && EXPERIMENTAL
1086 select ARM_ASM_UNIFIED
1088 By enabling this option, the kernel will be compiled in
1089 Thumb-2 mode. A compiler/assembler that understand the unified
1090 ARM-Thumb syntax is needed.
1094 config ARM_ASM_UNIFIED
1098 bool "Use the ARM EABI to compile the kernel"
1100 This option allows for the kernel to be compiled using the latest
1101 ARM ABI (aka EABI). This is only useful if you are using a user
1102 space environment that is also compiled with EABI.
1104 Since there are major incompatibilities between the legacy ABI and
1105 EABI, especially with regard to structure member alignment, this
1106 option also changes the kernel syscall calling convention to
1107 disambiguate both ABIs and allow for backward compatibility support
1108 (selected with CONFIG_OABI_COMPAT).
1110 To use this you need GCC version 4.0.0 or later.
1113 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1114 depends on AEABI && EXPERIMENTAL
1117 This option preserves the old syscall interface along with the
1118 new (ARM EABI) one. It also provides a compatibility layer to
1119 intercept syscalls that have structure arguments which layout
1120 in memory differs between the legacy ABI and the new ARM EABI
1121 (only for non "thumb" binaries). This option adds a tiny
1122 overhead to all syscalls and produces a slightly larger kernel.
1123 If you know you'll be using only pure EABI user space then you
1124 can say N here. If this option is not selected and you attempt
1125 to execute a legacy ABI binary then the result will be
1126 UNPREDICTABLE (in fact it can be predicted that it won't work
1127 at all). If in doubt say Y.
1129 config ARCH_HAS_HOLES_MEMORYMODEL
1132 # Discontigmem is deprecated
1133 config ARCH_DISCONTIGMEM_ENABLE
1136 config ARCH_SPARSEMEM_ENABLE
1139 config ARCH_SPARSEMEM_DEFAULT
1140 def_bool ARCH_SPARSEMEM_ENABLE
1142 config ARCH_SELECT_MEMORY_MODEL
1143 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1147 default "4" if ARCH_LH7A40X
1149 depends on NEED_MULTIPLE_NODES
1152 bool "High Memory Support (EXPERIMENTAL)"
1153 depends on MMU && EXPERIMENTAL
1155 The address space of ARM processors is only 4 Gigabytes large
1156 and it has to accommodate user address space, kernel address
1157 space as well as some memory mapped IO. That means that, if you
1158 have a large amount of physical memory and/or IO, not all of the
1159 memory can be "permanently mapped" by the kernel. The physical
1160 memory that is not permanently mapped is called "high memory".
1162 Depending on the selected kernel/user memory split, minimum
1163 vmalloc space and actual amount of RAM, you may not need this
1164 option which should result in a slightly faster kernel.
1169 bool "Allocate 2nd-level pagetables from highmem"
1171 depends on !OUTER_CACHE
1176 bool "Timer and CPU usage LEDs"
1177 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1178 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1179 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1180 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1181 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1182 ARCH_AT91 || ARCH_DAVINCI || \
1183 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1185 If you say Y here, the LEDs on your machine will be used
1186 to provide useful information about your current system status.
1188 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1189 be able to select which LEDs are active using the options below. If
1190 you are compiling a kernel for the EBSA-110 or the LART however, the
1191 red LED will simply flash regularly to indicate that the system is
1192 still functional. It is safe to say Y here if you have a CATS
1193 system, but the driver will do nothing.
1196 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1197 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1198 || MACH_OMAP_PERSEUS2
1200 depends on !GENERIC_CLOCKEVENTS
1201 default y if ARCH_EBSA110
1203 If you say Y here, one of the system LEDs (the green one on the
1204 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1205 will flash regularly to indicate that the system is still
1206 operational. This is mainly useful to kernel hackers who are
1207 debugging unstable kernels.
1209 The LART uses the same LED for both Timer LED and CPU usage LED
1210 functions. You may choose to use both, but the Timer LED function
1211 will overrule the CPU usage LED.
1214 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1216 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1217 || MACH_OMAP_PERSEUS2
1220 If you say Y here, the red LED will be used to give a good real
1221 time indication of CPU usage, by lighting whenever the idle task
1222 is not currently executing.
1224 The LART uses the same LED for both Timer LED and CPU usage LED
1225 functions. You may choose to use both, but the Timer LED function
1226 will overrule the CPU usage LED.
1228 config ALIGNMENT_TRAP
1230 depends on CPU_CP15_MMU
1231 default y if !ARCH_EBSA110
1233 ARM processors cannot fetch/store information which is not
1234 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1235 address divisible by 4. On 32-bit ARM processors, these non-aligned
1236 fetch/store instructions will be emulated in software if you say
1237 here, which has a severe performance impact. This is necessary for
1238 correct operation of some network protocols. With an IP-only
1239 configuration it is safe to say N, otherwise say Y.
1241 config UACCESS_WITH_MEMCPY
1242 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1243 depends on MMU && EXPERIMENTAL
1244 default y if CPU_FEROCEON
1246 Implement faster copy_to_user and clear_user methods for CPU
1247 cores where a 8-word STM instruction give significantly higher
1248 memory write throughput than a sequence of individual 32bit stores.
1250 A possible side effect is a slight increase in scheduling latency
1251 between threads sharing the same address space if they invoke
1252 such copy operations with large buffers.
1254 However, if the CPU data cache is using a write-allocate mode,
1255 this option is unlikely to provide any performance gain.
1261 # Compressed boot loader in ROM. Yes, we really want to ask about
1262 # TEXT and BSS so we preserve their values in the config files.
1263 config ZBOOT_ROM_TEXT
1264 hex "Compressed ROM boot loader base address"
1267 The physical address at which the ROM-able zImage is to be
1268 placed in the target. Platforms which normally make use of
1269 ROM-able zImage formats normally set this to a suitable
1270 value in their defconfig file.
1272 If ZBOOT_ROM is not enabled, this has no effect.
1274 config ZBOOT_ROM_BSS
1275 hex "Compressed ROM boot loader BSS address"
1278 The base address of an area of read/write memory in the target
1279 for the ROM-able zImage which must be available while the
1280 decompressor is running. It must be large enough to hold the
1281 entire decompressed kernel plus an additional 128 KiB.
1282 Platforms which normally make use of ROM-able zImage formats
1283 normally set this to a suitable value in their defconfig file.
1285 If ZBOOT_ROM is not enabled, this has no effect.
1288 bool "Compressed boot loader in ROM/flash"
1289 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1291 Say Y here if you intend to execute your compressed kernel image
1292 (zImage) directly from ROM or flash. If unsure, say N.
1295 string "Default kernel command string"
1298 On some architectures (EBSA110 and CATS), there is currently no way
1299 for the boot loader to pass arguments to the kernel. For these
1300 architectures, you should supply some command-line options at build
1301 time by entering them here. As a minimum, you should specify the
1302 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1305 bool "Kernel Execute-In-Place from ROM"
1306 depends on !ZBOOT_ROM
1308 Execute-In-Place allows the kernel to run from non-volatile storage
1309 directly addressable by the CPU, such as NOR flash. This saves RAM
1310 space since the text section of the kernel is not loaded from flash
1311 to RAM. Read-write sections, such as the data section and stack,
1312 are still copied to RAM. The XIP kernel is not compressed since
1313 it has to run directly from flash, so it will take more space to
1314 store it. The flash address used to link the kernel object files,
1315 and for storing it, is configuration dependent. Therefore, if you
1316 say Y here, you must know the proper physical address where to
1317 store the kernel image depending on your own flash memory usage.
1319 Also note that the make target becomes "make xipImage" rather than
1320 "make zImage" or "make Image". The final kernel binary to put in
1321 ROM memory will be arch/arm/boot/xipImage.
1325 config XIP_PHYS_ADDR
1326 hex "XIP Kernel Physical Location"
1327 depends on XIP_KERNEL
1328 default "0x00080000"
1330 This is the physical address in your flash memory the kernel will
1331 be linked for and stored to. This address is dependent on your
1335 bool "Kexec system call (EXPERIMENTAL)"
1336 depends on EXPERIMENTAL
1338 kexec is a system call that implements the ability to shutdown your
1339 current kernel, and to start another kernel. It is like a reboot
1340 but it is independent of the system firmware. And like a reboot
1341 you can start any kernel with it, not just Linux.
1343 It is an ongoing process to be certain the hardware in a machine
1344 is properly shutdown, so do not be surprised if this code does not
1345 initially work for you. It may help to enable device hotplugging
1349 bool "Export atags in procfs"
1353 Should the atags used to boot the kernel be exported in an "atags"
1354 file in procfs. Useful with kexec.
1358 menu "CPU Power Management"
1362 source "drivers/cpufreq/Kconfig"
1364 config CPU_FREQ_SA1100
1367 config CPU_FREQ_SA1110
1370 config CPU_FREQ_INTEGRATOR
1371 tristate "CPUfreq driver for ARM Integrator CPUs"
1372 depends on ARCH_INTEGRATOR && CPU_FREQ
1375 This enables the CPUfreq driver for ARM Integrator CPUs.
1377 For details, take a look at <file:Documentation/cpu-freq>.
1383 depends on CPU_FREQ && ARCH_PXA && PXA25x
1385 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1387 config CPU_FREQ_S3C64XX
1388 bool "CPUfreq support for Samsung S3C64XX CPUs"
1389 depends on CPU_FREQ && CPU_S3C6410
1394 Internal configuration node for common cpufreq on Samsung SoC
1396 config CPU_FREQ_S3C24XX
1397 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1398 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1401 This enables the CPUfreq driver for the Samsung S3C24XX family
1404 For details, take a look at <file:Documentation/cpu-freq>.
1408 config CPU_FREQ_S3C24XX_PLL
1409 bool "Support CPUfreq changing of PLL frequency"
1410 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1412 Compile in support for changing the PLL frequency from the
1413 S3C24XX series CPUfreq driver. The PLL takes time to settle
1414 after a frequency change, so by default it is not enabled.
1416 This also means that the PLL tables for the selected CPU(s) will
1417 be built which may increase the size of the kernel image.
1419 config CPU_FREQ_S3C24XX_DEBUG
1420 bool "Debug CPUfreq Samsung driver core"
1421 depends on CPU_FREQ_S3C24XX
1423 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1425 config CPU_FREQ_S3C24XX_IODEBUG
1426 bool "Debug CPUfreq Samsung driver IO timing"
1427 depends on CPU_FREQ_S3C24XX
1429 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1431 config CPU_FREQ_S3C24XX_DEBUGFS
1432 bool "Export debugfs for CPUFreq"
1433 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1435 Export status information via debugfs.
1439 source "drivers/cpuidle/Kconfig"
1443 menu "Floating point emulation"
1445 comment "At least one emulation must be selected"
1448 bool "NWFPE math emulation"
1449 depends on !AEABI || OABI_COMPAT
1451 Say Y to include the NWFPE floating point emulator in the kernel.
1452 This is necessary to run most binaries. Linux does not currently
1453 support floating point hardware so you need to say Y here even if
1454 your machine has an FPA or floating point co-processor podule.
1456 You may say N here if you are going to load the Acorn FPEmulator
1457 early in the bootup.
1460 bool "Support extended precision"
1461 depends on FPE_NWFPE
1463 Say Y to include 80-bit support in the kernel floating-point
1464 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1465 Note that gcc does not generate 80-bit operations by default,
1466 so in most cases this option only enlarges the size of the
1467 floating point emulator without any good reason.
1469 You almost surely want to say N here.
1472 bool "FastFPE math emulation (EXPERIMENTAL)"
1473 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1475 Say Y here to include the FAST floating point emulator in the kernel.
1476 This is an experimental much faster emulator which now also has full
1477 precision for the mantissa. It does not support any exceptions.
1478 It is very simple, and approximately 3-6 times faster than NWFPE.
1480 It should be sufficient for most programs. It may be not suitable
1481 for scientific calculations, but you have to check this for yourself.
1482 If you do not feel you need a faster FP emulation you should better
1486 bool "VFP-format floating point maths"
1487 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1489 Say Y to include VFP support code in the kernel. This is needed
1490 if your hardware includes a VFP unit.
1492 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1493 release notes and additional status information.
1495 Say N if your target does not have VFP hardware.
1503 bool "Advanced SIMD (NEON) Extension support"
1504 depends on VFPv3 && CPU_V7
1506 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1511 menu "Userspace binary formats"
1513 source "fs/Kconfig.binfmt"
1516 tristate "RISC OS personality"
1519 Say Y here to include the kernel code necessary if you want to run
1520 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1521 experimental; if this sounds frightening, say N and sleep in peace.
1522 You can also say M here to compile this support as a module (which
1523 will be called arthur).
1527 menu "Power management options"
1529 source "kernel/power/Kconfig"
1531 config ARCH_SUSPEND_POSSIBLE
1536 source "net/Kconfig"
1538 source "drivers/Kconfig"
1542 source "arch/arm/Kconfig.debug"
1544 source "security/Kconfig"
1546 source "crypto/Kconfig"
1548 source "lib/Kconfig"