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"
636 select ARCH_HAS_CPUFREQ
637 select ARCH_REQUIRE_GPIOLIB
638 select SAMSUNG_CLKSRC
639 select SAMSUNG_IRQ_VIC_TIMER
640 select SAMSUNG_IRQ_UART
641 select S3C_GPIO_TRACK
642 select S3C_GPIO_PULL_UPDOWN
643 select S3C_GPIO_CFG_S3C24XX
644 select S3C_GPIO_CFG_S3C64XX
646 select USB_ARCH_HAS_OHCI
647 select SAMSUNG_GPIOLIB_4BIT
649 Samsung S3C64XX series based systems
652 bool "Samsung S5P6440"
657 Samsung S5P6440 CPU based systems
660 bool "Samsung S5PC1XX"
665 Samsung S5PC1XX series based systems
675 Support for the StrongARM based Digital DNARD machine, also known
676 as "Shark" (<http://www.shark-linux.de/shark.html>).
681 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
682 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
684 Say Y here for systems based on one of the Sharp LH7A40X
685 System on a Chip processors. These CPUs include an ARM922T
686 core with a wide array of integrated devices for
687 hand-held and low-power applications.
690 bool "ST-Ericsson U300 Series"
697 select GENERIC_CLOCKEVENTS
702 Support for ST-Ericsson U300 series mobile platforms.
708 select GENERIC_CLOCKEVENTS
710 select ARCH_REQUIRE_GPIOLIB
715 select GENERIC_ALLOCATOR
716 select ARCH_HAS_HOLES_MEMORYMODEL
718 Support for TI's DaVinci platform.
724 select ARCH_REQUIRE_GPIOLIB
725 select ARCH_HAS_CPUFREQ
727 select GENERIC_CLOCKEVENTS
729 Support for TI's OMAP platform (OMAP1 and OMAP2).
732 bool "Broadcom BCMRING"
738 select GENERIC_CLOCKEVENTS
739 select ARCH_WANT_OPTIONAL_GPIOLIB
741 Support for Broadcom's BCMRing platform.
744 bool "ST-Ericsson U8500 Series"
748 select GENERIC_CLOCKEVENTS
751 Support for ST-Ericsson's Ux500 architecture
755 source "arch/arm/mach-clps711x/Kconfig"
757 source "arch/arm/mach-ep93xx/Kconfig"
759 source "arch/arm/mach-footbridge/Kconfig"
761 source "arch/arm/mach-gemini/Kconfig"
763 source "arch/arm/mach-integrator/Kconfig"
765 source "arch/arm/mach-iop32x/Kconfig"
767 source "arch/arm/mach-iop33x/Kconfig"
769 source "arch/arm/mach-iop13xx/Kconfig"
771 source "arch/arm/mach-ixp4xx/Kconfig"
773 source "arch/arm/mach-ixp2000/Kconfig"
775 source "arch/arm/mach-ixp23xx/Kconfig"
777 source "arch/arm/mach-loki/Kconfig"
779 source "arch/arm/mach-mv78xx0/Kconfig"
781 source "arch/arm/mach-pxa/Kconfig"
782 source "arch/arm/plat-pxa/Kconfig"
784 source "arch/arm/mach-mmp/Kconfig"
786 source "arch/arm/mach-sa1100/Kconfig"
788 source "arch/arm/plat-omap/Kconfig"
790 source "arch/arm/mach-omap1/Kconfig"
792 source "arch/arm/mach-omap2/Kconfig"
794 source "arch/arm/mach-orion5x/Kconfig"
796 source "arch/arm/mach-kirkwood/Kconfig"
798 source "arch/arm/mach-dove/Kconfig"
800 source "arch/arm/plat-samsung/Kconfig"
801 source "arch/arm/plat-s3c24xx/Kconfig"
802 source "arch/arm/plat-s5p/Kconfig"
803 source "arch/arm/plat-s5pc1xx/Kconfig"
806 source "arch/arm/mach-s3c2400/Kconfig"
807 source "arch/arm/mach-s3c2410/Kconfig"
808 source "arch/arm/mach-s3c2412/Kconfig"
809 source "arch/arm/mach-s3c2440/Kconfig"
810 source "arch/arm/mach-s3c2443/Kconfig"
814 source "arch/arm/mach-s3c64xx/Kconfig"
817 source "arch/arm/mach-s5p6440/Kconfig"
819 source "arch/arm/plat-stmp3xxx/Kconfig"
822 source "arch/arm/mach-s5pc100/Kconfig"
825 source "arch/arm/mach-lh7a40x/Kconfig"
827 source "arch/arm/mach-h720x/Kconfig"
829 source "arch/arm/mach-versatile/Kconfig"
831 source "arch/arm/mach-aaec2000/Kconfig"
833 source "arch/arm/mach-realview/Kconfig"
835 source "arch/arm/mach-at91/Kconfig"
837 source "arch/arm/plat-mxc/Kconfig"
839 source "arch/arm/mach-nomadik/Kconfig"
840 source "arch/arm/plat-nomadik/Kconfig"
842 source "arch/arm/mach-netx/Kconfig"
844 source "arch/arm/mach-ns9xxx/Kconfig"
846 source "arch/arm/mach-davinci/Kconfig"
848 source "arch/arm/mach-ks8695/Kconfig"
850 source "arch/arm/mach-msm/Kconfig"
852 source "arch/arm/mach-u300/Kconfig"
854 source "arch/arm/mach-w90x900/Kconfig"
856 source "arch/arm/mach-bcmring/Kconfig"
858 source "arch/arm/mach-ux500/Kconfig"
860 # Definitions to make life easier
866 select GENERIC_CLOCKEVENTS
875 source arch/arm/mm/Kconfig
878 bool "Enable iWMMXt support"
879 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
880 default y if PXA27x || PXA3xx || ARCH_MMP
882 Enable support for iWMMXt context switching at run time if
883 running on a CPU that supports it.
885 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
888 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
892 source "arch/arm/Kconfig-nommu"
895 config ARM_ERRATA_411920
896 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
897 depends on CPU_V6 && !SMP
899 Invalidation of the Instruction Cache operation can
900 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
901 It does not affect the MPCore. This option enables the ARM Ltd.
902 recommended workaround.
904 config ARM_ERRATA_430973
905 bool "ARM errata: Stale prediction on replaced interworking branch"
908 This option enables the workaround for the 430973 Cortex-A8
909 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
910 interworking branch is replaced with another code sequence at the
911 same virtual address, whether due to self-modifying code or virtual
912 to physical address re-mapping, Cortex-A8 does not recover from the
913 stale interworking branch prediction. This results in Cortex-A8
914 executing the new code sequence in the incorrect ARM or Thumb state.
915 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
916 and also flushes the branch target cache at every context switch.
917 Note that setting specific bits in the ACTLR register may not be
918 available in non-secure mode.
920 config ARM_ERRATA_458693
921 bool "ARM errata: Processor deadlock when a false hazard is created"
924 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
925 erratum. For very specific sequences of memory operations, it is
926 possible for a hazard condition intended for a cache line to instead
927 be incorrectly associated with a different cache line. This false
928 hazard might then cause a processor deadlock. The workaround enables
929 the L1 caching of the NEON accesses and disables the PLD instruction
930 in the ACTLR register. Note that setting specific bits in the ACTLR
931 register may not be available in non-secure mode.
933 config ARM_ERRATA_460075
934 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
937 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
938 erratum. Any asynchronous access to the L2 cache may encounter a
939 situation in which recent store transactions to the L2 cache are lost
940 and overwritten with stale memory contents from external memory. The
941 workaround disables the write-allocate mode for the L2 cache via the
942 ACTLR register. Note that setting specific bits in the ACTLR register
943 may not be available in non-secure mode.
947 source "arch/arm/common/Kconfig"
949 config FORCE_MAX_ZONEORDER
962 Find out whether you have ISA slots on your motherboard. ISA is the
963 name of a bus system, i.e. the way the CPU talks to the other stuff
964 inside your box. Other bus systems are PCI, EISA, MicroChannel
965 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
966 newer boards don't support it. If you have ISA, say Y, otherwise N.
968 # Select ISA DMA controller support
973 # Select ISA DMA interface
978 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
980 Find out whether you have a PCI motherboard. PCI is the name of a
981 bus system, i.e. the way the CPU talks to the other stuff inside
982 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
983 VESA. If you have PCI, say Y, otherwise N.
988 # Select the host bridge type
989 config PCI_HOST_VIA82C505
991 depends on PCI && ARCH_SHARK
994 config PCI_HOST_ITE8152
996 depends on PCI && MACH_ARMCORE
1000 source "drivers/pci/Kconfig"
1002 source "drivers/pcmcia/Kconfig"
1006 menu "Kernel Features"
1008 source "kernel/time/Kconfig"
1011 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1012 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1013 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1014 depends on GENERIC_CLOCKEVENTS
1015 select USE_GENERIC_SMP_HELPERS
1016 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1018 This enables support for systems with more than one CPU. If you have
1019 a system with only one CPU, like most personal computers, say N. If
1020 you have a system with more than one CPU, say Y.
1022 If you say N here, the kernel will run on single and multiprocessor
1023 machines, but will use only one CPU of a multiprocessor machine. If
1024 you say Y here, the kernel will run on many, but not all, single
1025 processor machines. On a single processor machine, the kernel will
1026 run faster if you say N here.
1028 See also <file:Documentation/i386/IO-APIC.txt>,
1029 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1030 <http://www.linuxdoc.org/docs.html#howto>.
1032 If you don't know what to do here, say N.
1038 This option enables support for the ARM system coherency unit
1044 This options enables support for the ARM timer and watchdog unit
1047 prompt "Memory split"
1050 Select the desired split between kernel and user memory.
1052 If you are not absolutely sure what you are doing, leave this
1056 bool "3G/1G user/kernel split"
1058 bool "2G/2G user/kernel split"
1060 bool "1G/3G user/kernel split"
1065 default 0x40000000 if VMSPLIT_1G
1066 default 0x80000000 if VMSPLIT_2G
1070 int "Maximum number of CPUs (2-32)"
1076 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1077 depends on SMP && HOTPLUG && EXPERIMENTAL
1079 Say Y here to experiment with turning CPUs off and on. CPUs
1080 can be controlled through /sys/devices/system/cpu.
1083 bool "Use local timer interrupts"
1084 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1085 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1087 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1089 Enable support for local timers on SMP platforms, rather then the
1090 legacy IPI broadcast method. Local timers allows the system
1091 accounting to be spread across the timer interval, preventing a
1092 "thundering herd" at every timer tick.
1094 source kernel/Kconfig.preempt
1098 default 128 if ARCH_L7200
1099 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440
1100 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1101 default AT91_TIMER_HZ if ARCH_AT91
1104 config THUMB2_KERNEL
1105 bool "Compile the kernel in Thumb-2 mode"
1106 depends on CPU_V7 && EXPERIMENTAL
1108 select ARM_ASM_UNIFIED
1110 By enabling this option, the kernel will be compiled in
1111 Thumb-2 mode. A compiler/assembler that understand the unified
1112 ARM-Thumb syntax is needed.
1116 config ARM_ASM_UNIFIED
1120 bool "Use the ARM EABI to compile the kernel"
1122 This option allows for the kernel to be compiled using the latest
1123 ARM ABI (aka EABI). This is only useful if you are using a user
1124 space environment that is also compiled with EABI.
1126 Since there are major incompatibilities between the legacy ABI and
1127 EABI, especially with regard to structure member alignment, this
1128 option also changes the kernel syscall calling convention to
1129 disambiguate both ABIs and allow for backward compatibility support
1130 (selected with CONFIG_OABI_COMPAT).
1132 To use this you need GCC version 4.0.0 or later.
1135 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1136 depends on AEABI && EXPERIMENTAL
1139 This option preserves the old syscall interface along with the
1140 new (ARM EABI) one. It also provides a compatibility layer to
1141 intercept syscalls that have structure arguments which layout
1142 in memory differs between the legacy ABI and the new ARM EABI
1143 (only for non "thumb" binaries). This option adds a tiny
1144 overhead to all syscalls and produces a slightly larger kernel.
1145 If you know you'll be using only pure EABI user space then you
1146 can say N here. If this option is not selected and you attempt
1147 to execute a legacy ABI binary then the result will be
1148 UNPREDICTABLE (in fact it can be predicted that it won't work
1149 at all). If in doubt say Y.
1151 config ARCH_HAS_HOLES_MEMORYMODEL
1154 # Discontigmem is deprecated
1155 config ARCH_DISCONTIGMEM_ENABLE
1158 config ARCH_SPARSEMEM_ENABLE
1161 config ARCH_SPARSEMEM_DEFAULT
1162 def_bool ARCH_SPARSEMEM_ENABLE
1164 config ARCH_SELECT_MEMORY_MODEL
1165 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1169 default "4" if ARCH_LH7A40X
1171 depends on NEED_MULTIPLE_NODES
1174 bool "High Memory Support (EXPERIMENTAL)"
1175 depends on MMU && EXPERIMENTAL
1177 The address space of ARM processors is only 4 Gigabytes large
1178 and it has to accommodate user address space, kernel address
1179 space as well as some memory mapped IO. That means that, if you
1180 have a large amount of physical memory and/or IO, not all of the
1181 memory can be "permanently mapped" by the kernel. The physical
1182 memory that is not permanently mapped is called "high memory".
1184 Depending on the selected kernel/user memory split, minimum
1185 vmalloc space and actual amount of RAM, you may not need this
1186 option which should result in a slightly faster kernel.
1191 bool "Allocate 2nd-level pagetables from highmem"
1193 depends on !OUTER_CACHE
1198 bool "Timer and CPU usage LEDs"
1199 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1200 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1201 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1202 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1203 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1204 ARCH_AT91 || ARCH_DAVINCI || \
1205 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1207 If you say Y here, the LEDs on your machine will be used
1208 to provide useful information about your current system status.
1210 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1211 be able to select which LEDs are active using the options below. If
1212 you are compiling a kernel for the EBSA-110 or the LART however, the
1213 red LED will simply flash regularly to indicate that the system is
1214 still functional. It is safe to say Y here if you have a CATS
1215 system, but the driver will do nothing.
1218 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1219 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1220 || MACH_OMAP_PERSEUS2
1222 depends on !GENERIC_CLOCKEVENTS
1223 default y if ARCH_EBSA110
1225 If you say Y here, one of the system LEDs (the green one on the
1226 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1227 will flash regularly to indicate that the system is still
1228 operational. This is mainly useful to kernel hackers who are
1229 debugging unstable kernels.
1231 The LART uses the same LED for both Timer LED and CPU usage LED
1232 functions. You may choose to use both, but the Timer LED function
1233 will overrule the CPU usage LED.
1236 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1238 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1239 || MACH_OMAP_PERSEUS2
1242 If you say Y here, the red LED will be used to give a good real
1243 time indication of CPU usage, by lighting whenever the idle task
1244 is not currently executing.
1246 The LART uses the same LED for both Timer LED and CPU usage LED
1247 functions. You may choose to use both, but the Timer LED function
1248 will overrule the CPU usage LED.
1250 config ALIGNMENT_TRAP
1252 depends on CPU_CP15_MMU
1253 default y if !ARCH_EBSA110
1255 ARM processors cannot fetch/store information which is not
1256 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1257 address divisible by 4. On 32-bit ARM processors, these non-aligned
1258 fetch/store instructions will be emulated in software if you say
1259 here, which has a severe performance impact. This is necessary for
1260 correct operation of some network protocols. With an IP-only
1261 configuration it is safe to say N, otherwise say Y.
1263 config UACCESS_WITH_MEMCPY
1264 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1265 depends on MMU && EXPERIMENTAL
1266 default y if CPU_FEROCEON
1268 Implement faster copy_to_user and clear_user methods for CPU
1269 cores where a 8-word STM instruction give significantly higher
1270 memory write throughput than a sequence of individual 32bit stores.
1272 A possible side effect is a slight increase in scheduling latency
1273 between threads sharing the same address space if they invoke
1274 such copy operations with large buffers.
1276 However, if the CPU data cache is using a write-allocate mode,
1277 this option is unlikely to provide any performance gain.
1283 # Compressed boot loader in ROM. Yes, we really want to ask about
1284 # TEXT and BSS so we preserve their values in the config files.
1285 config ZBOOT_ROM_TEXT
1286 hex "Compressed ROM boot loader base address"
1289 The physical address at which the ROM-able zImage is to be
1290 placed in the target. Platforms which normally make use of
1291 ROM-able zImage formats normally set this to a suitable
1292 value in their defconfig file.
1294 If ZBOOT_ROM is not enabled, this has no effect.
1296 config ZBOOT_ROM_BSS
1297 hex "Compressed ROM boot loader BSS address"
1300 The base address of an area of read/write memory in the target
1301 for the ROM-able zImage which must be available while the
1302 decompressor is running. It must be large enough to hold the
1303 entire decompressed kernel plus an additional 128 KiB.
1304 Platforms which normally make use of ROM-able zImage formats
1305 normally set this to a suitable value in their defconfig file.
1307 If ZBOOT_ROM is not enabled, this has no effect.
1310 bool "Compressed boot loader in ROM/flash"
1311 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1313 Say Y here if you intend to execute your compressed kernel image
1314 (zImage) directly from ROM or flash. If unsure, say N.
1317 string "Default kernel command string"
1320 On some architectures (EBSA110 and CATS), there is currently no way
1321 for the boot loader to pass arguments to the kernel. For these
1322 architectures, you should supply some command-line options at build
1323 time by entering them here. As a minimum, you should specify the
1324 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1327 bool "Kernel Execute-In-Place from ROM"
1328 depends on !ZBOOT_ROM
1330 Execute-In-Place allows the kernel to run from non-volatile storage
1331 directly addressable by the CPU, such as NOR flash. This saves RAM
1332 space since the text section of the kernel is not loaded from flash
1333 to RAM. Read-write sections, such as the data section and stack,
1334 are still copied to RAM. The XIP kernel is not compressed since
1335 it has to run directly from flash, so it will take more space to
1336 store it. The flash address used to link the kernel object files,
1337 and for storing it, is configuration dependent. Therefore, if you
1338 say Y here, you must know the proper physical address where to
1339 store the kernel image depending on your own flash memory usage.
1341 Also note that the make target becomes "make xipImage" rather than
1342 "make zImage" or "make Image". The final kernel binary to put in
1343 ROM memory will be arch/arm/boot/xipImage.
1347 config XIP_PHYS_ADDR
1348 hex "XIP Kernel Physical Location"
1349 depends on XIP_KERNEL
1350 default "0x00080000"
1352 This is the physical address in your flash memory the kernel will
1353 be linked for and stored to. This address is dependent on your
1357 bool "Kexec system call (EXPERIMENTAL)"
1358 depends on EXPERIMENTAL
1360 kexec is a system call that implements the ability to shutdown your
1361 current kernel, and to start another kernel. It is like a reboot
1362 but it is independent of the system firmware. And like a reboot
1363 you can start any kernel with it, not just Linux.
1365 It is an ongoing process to be certain the hardware in a machine
1366 is properly shutdown, so do not be surprised if this code does not
1367 initially work for you. It may help to enable device hotplugging
1371 bool "Export atags in procfs"
1375 Should the atags used to boot the kernel be exported in an "atags"
1376 file in procfs. Useful with kexec.
1380 menu "CPU Power Management"
1384 source "drivers/cpufreq/Kconfig"
1386 config CPU_FREQ_SA1100
1389 config CPU_FREQ_SA1110
1392 config CPU_FREQ_INTEGRATOR
1393 tristate "CPUfreq driver for ARM Integrator CPUs"
1394 depends on ARCH_INTEGRATOR && CPU_FREQ
1397 This enables the CPUfreq driver for ARM Integrator CPUs.
1399 For details, take a look at <file:Documentation/cpu-freq>.
1405 depends on CPU_FREQ && ARCH_PXA && PXA25x
1407 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1409 config CPU_FREQ_S3C64XX
1410 bool "CPUfreq support for Samsung S3C64XX CPUs"
1411 depends on CPU_FREQ && CPU_S3C6410
1416 Internal configuration node for common cpufreq on Samsung SoC
1418 config CPU_FREQ_S3C24XX
1419 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1420 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1423 This enables the CPUfreq driver for the Samsung S3C24XX family
1426 For details, take a look at <file:Documentation/cpu-freq>.
1430 config CPU_FREQ_S3C24XX_PLL
1431 bool "Support CPUfreq changing of PLL frequency"
1432 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1434 Compile in support for changing the PLL frequency from the
1435 S3C24XX series CPUfreq driver. The PLL takes time to settle
1436 after a frequency change, so by default it is not enabled.
1438 This also means that the PLL tables for the selected CPU(s) will
1439 be built which may increase the size of the kernel image.
1441 config CPU_FREQ_S3C24XX_DEBUG
1442 bool "Debug CPUfreq Samsung driver core"
1443 depends on CPU_FREQ_S3C24XX
1445 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1447 config CPU_FREQ_S3C24XX_IODEBUG
1448 bool "Debug CPUfreq Samsung driver IO timing"
1449 depends on CPU_FREQ_S3C24XX
1451 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1453 config CPU_FREQ_S3C24XX_DEBUGFS
1454 bool "Export debugfs for CPUFreq"
1455 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1457 Export status information via debugfs.
1461 source "drivers/cpuidle/Kconfig"
1465 menu "Floating point emulation"
1467 comment "At least one emulation must be selected"
1470 bool "NWFPE math emulation"
1471 depends on !AEABI || OABI_COMPAT
1473 Say Y to include the NWFPE floating point emulator in the kernel.
1474 This is necessary to run most binaries. Linux does not currently
1475 support floating point hardware so you need to say Y here even if
1476 your machine has an FPA or floating point co-processor podule.
1478 You may say N here if you are going to load the Acorn FPEmulator
1479 early in the bootup.
1482 bool "Support extended precision"
1483 depends on FPE_NWFPE
1485 Say Y to include 80-bit support in the kernel floating-point
1486 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1487 Note that gcc does not generate 80-bit operations by default,
1488 so in most cases this option only enlarges the size of the
1489 floating point emulator without any good reason.
1491 You almost surely want to say N here.
1494 bool "FastFPE math emulation (EXPERIMENTAL)"
1495 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1497 Say Y here to include the FAST floating point emulator in the kernel.
1498 This is an experimental much faster emulator which now also has full
1499 precision for the mantissa. It does not support any exceptions.
1500 It is very simple, and approximately 3-6 times faster than NWFPE.
1502 It should be sufficient for most programs. It may be not suitable
1503 for scientific calculations, but you have to check this for yourself.
1504 If you do not feel you need a faster FP emulation you should better
1508 bool "VFP-format floating point maths"
1509 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1511 Say Y to include VFP support code in the kernel. This is needed
1512 if your hardware includes a VFP unit.
1514 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1515 release notes and additional status information.
1517 Say N if your target does not have VFP hardware.
1525 bool "Advanced SIMD (NEON) Extension support"
1526 depends on VFPv3 && CPU_V7
1528 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1533 menu "Userspace binary formats"
1535 source "fs/Kconfig.binfmt"
1538 tristate "RISC OS personality"
1541 Say Y here to include the kernel code necessary if you want to run
1542 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1543 experimental; if this sounds frightening, say N and sleep in peace.
1544 You can also say M here to compile this support as a module (which
1545 will be called arthur).
1549 menu "Power management options"
1551 source "kernel/power/Kconfig"
1553 config ARCH_SUSPEND_POSSIBLE
1558 source "net/Kconfig"
1560 source "drivers/Kconfig"
1564 source "arch/arm/Kconfig.debug"
1566 source "security/Kconfig"
1568 source "crypto/Kconfig"
1570 source "lib/Kconfig"