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
37 config HAVE_SCHED_CLOCK
46 config GENERIC_CLOCKEVENTS
49 config GENERIC_CLOCKEVENTS_BROADCAST
51 depends on GENERIC_CLOCKEVENTS
52 default y if SMP && !LOCAL_TIMERS
56 select GENERIC_ALLOCATOR
64 The Extended Industry Standard Architecture (EISA) bus was
65 developed as an open alternative to the IBM MicroChannel bus.
67 The EISA bus provided some of the features of the IBM MicroChannel
68 bus while maintaining backward compatibility with cards made for
69 the older ISA bus. The EISA bus saw limited use between 1988 and
70 1995 when it was made obsolete by the PCI bus.
72 Say Y here if you are building a kernel for an EISA-based machine.
82 MicroChannel Architecture is found in some IBM PS/2 machines and
83 laptops. It is a bus system similar to PCI or ISA. See
84 <file:Documentation/mca.txt> (and especially the web page given
85 there) before attempting to build an MCA bus kernel.
87 config GENERIC_HARDIRQS
91 config STACKTRACE_SUPPORT
95 config HAVE_LATENCYTOP_SUPPORT
100 config LOCKDEP_SUPPORT
104 config TRACE_IRQFLAGS_SUPPORT
108 config HARDIRQS_SW_RESEND
112 config GENERIC_IRQ_PROBE
116 config GENERIC_LOCKBREAK
119 depends on SMP && PREEMPT
121 config RWSEM_GENERIC_SPINLOCK
125 config RWSEM_XCHGADD_ALGORITHM
128 config ARCH_HAS_ILOG2_U32
131 config ARCH_HAS_ILOG2_U64
134 config ARCH_HAS_CPUFREQ
137 Internal node to signify that the ARCH has CPUFREQ support
138 and that the relevant menu configurations are displayed for
141 config GENERIC_HWEIGHT
145 config GENERIC_CALIBRATE_DELAY
149 config ARCH_MAY_HAVE_PC_FDC
155 config GENERIC_ISA_DMA
164 config GENERIC_HARDIRQS_NO__DO_IRQ
169 config OPROFILE_ARMV6
171 depends on CPU_V6 && !SMP
172 select OPROFILE_ARM11_CORE
174 config OPROFILE_MPCORE
176 depends on CPU_V6 && SMP
177 select OPROFILE_ARM11_CORE
179 config OPROFILE_ARM11_CORE
182 config OPROFILE_ARMV7
184 depends on CPU_V7 && !SMP
191 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
192 default DRAM_BASE if REMAP_VECTORS_TO_RAM
195 The base address of exception vectors.
197 source "init/Kconfig"
199 source "kernel/Kconfig.freezer"
204 bool "MMU-based Paged Memory Management Support"
207 Select if you want MMU-based virtualised addressing space
208 support by paged memory management. If unsure, say 'Y'.
211 prompt "ARM system type"
212 default ARCH_VERSATILE
215 bool "Agilent AAEC-2000 based"
220 This enables support for systems based on the Agilent AAEC-2000
222 config ARCH_INTEGRATOR
223 bool "ARM Ltd. Integrator family"
225 select ARCH_HAS_CPUFREQ
230 Support for ARM's Integrator platform.
233 bool "ARM Ltd. RealView family"
239 select GENERIC_CLOCKEVENTS
240 select ARCH_WANT_OPTIONAL_GPIOLIB
242 This enables support for ARM Ltd RealView boards.
244 config ARCH_VERSATILE
245 bool "ARM Ltd. Versatile family"
252 select GENERIC_CLOCKEVENTS
253 select ARCH_WANT_OPTIONAL_GPIOLIB
255 This enables support for ARM Ltd Versatile board.
260 select ARCH_REQUIRE_GPIOLIB
263 This enables support for systems based on the Atmel AT91RM9200,
264 AT91SAM9 and AT91CAP9 processors.
267 bool "Cirrus Logic CLPS711x/EP721x-based"
270 Support for Cirrus Logic 711x/721x based boards.
273 bool "Cortina Systems Gemini"
276 select ARCH_REQUIRE_GPIOLIB
278 Support for the Cortina Systems Gemini family SoCs
286 This is an evaluation board for the StrongARM processor available
287 from Digital. It has limited hardware on-board, including an
288 Ethernet interface, two PCMCIA sockets, two serial ports and a
299 select ARCH_REQUIRE_GPIOLIB
300 select ARCH_HAS_HOLES_MEMORYMODEL
302 This enables support for the Cirrus EP93xx series of CPUs.
304 config ARCH_FOOTBRIDGE
309 Support for systems based on the DC21285 companion chip
310 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
313 bool "Freescale MXC/iMX-based"
315 select GENERIC_CLOCKEVENTS
318 select ARCH_REQUIRE_GPIOLIB
321 Support for Freescale MXC/iMX-based family of processors
324 bool "Freescale STMP3xxx"
328 select ARCH_REQUIRE_GPIOLIB
330 select GENERIC_CLOCKEVENTS
332 select USB_ARCH_HAS_EHCI
334 Support for systems based on the Freescale 3xxx CPUs.
337 bool "Hilscher NetX based"
340 select GENERIC_CLOCKEVENTS
343 This enables support for systems based on the Hilscher NetX Soc
346 bool "Hynix HMS720x-based"
350 This enables support for systems based on the Hynix HMS720x
353 bool "STMicroelectronics Nomadik"
360 select GENERIC_CLOCKEVENTS
362 select ARCH_REQUIRE_GPIOLIB
364 Support for the Nomadik platform by ST-Ericsson
372 select ARCH_SUPPORTS_MSI
375 Support for Intel's IOP13XX (XScale) family of processors.
384 select ARCH_REQUIRE_GPIOLIB
386 Support for Intel's 80219 and IOP32X (XScale) family of
396 select ARCH_REQUIRE_GPIOLIB
398 Support for Intel's IOP33X (XScale) family of processors.
406 Support for Intel's IXP23xx (XScale) family of processors.
409 bool "IXP2400/2800-based"
414 Support for Intel's IXP2400/2800 (XScale) family of processors.
422 select GENERIC_CLOCKEVENTS
423 select DMABOUNCE if PCI
425 Support for Intel's IXP4XX (XScale) family of processors.
432 Say Y here if you intend to run this kernel on a LinkUp Systems
433 L7200 Software Development Board which uses an ARM720T processor.
434 Information on this board can be obtained at:
436 <http://www.linkupsys.com/>
438 If you have any questions or comments about the Linux kernel port
439 to this board, send e-mail to <sjhill@cotw.com>.
442 bool "Marvell Kirkwood"
446 select ARCH_REQUIRE_GPIOLIB
448 select GENERIC_CLOCKEVENTS
451 Support for the following Marvell Kirkwood series SoCs:
452 88F6180, 88F6192 and 88F6281.
455 bool "Marvell Loki (88RC8480)"
458 select GENERIC_CLOCKEVENTS
461 Support for the Marvell Loki (88RC8480) SoC.
464 bool "Marvell MV78xx0"
468 select ARCH_REQUIRE_GPIOLIB
470 select GENERIC_CLOCKEVENTS
473 Support for the following Marvell MV78xx0 series SoCs:
482 select ARCH_REQUIRE_GPIOLIB
484 select GENERIC_CLOCKEVENTS
487 Support for the following Marvell Orion 5x series SoCs:
488 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
489 Orion-2 (5281), Orion-1-90 (6183).
492 bool "Marvell PXA168/910"
495 select ARCH_REQUIRE_GPIOLIB
499 select GENERIC_CLOCKEVENTS
503 Support for Marvell's PXA168/910 processor line.
506 bool "Micrel/Kendin KS8695"
509 select ARCH_REQUIRE_GPIOLIB
511 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
512 System-on-Chip devices.
515 bool "NetSilicon NS9xxx"
519 select GENERIC_CLOCKEVENTS
522 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
525 <http://www.digi.com/products/microprocessors/index.jsp>
528 bool "Nuvoton W90X900 CPU"
530 select ARCH_REQUIRE_GPIOLIB
535 select GENERIC_CLOCKEVENTS
537 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
538 At present, the w90x900 has been renamed nuc900, regarding
539 the ARM series product line, you can login the following
540 link address to know more.
542 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
543 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
546 bool "Philips Nexperia PNX4008 Mobile"
550 This enables support for Philips PNX4008 mobile platform.
553 bool "PXA2xx/PXA3xx-based"
556 select ARCH_HAS_CPUFREQ
560 select ARCH_REQUIRE_GPIOLIB
562 select GENERIC_CLOCKEVENTS
566 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
572 select GENERIC_CLOCKEVENTS
574 Support for Qualcomm MSM7K based systems. This runs on the ARM11
575 apps processor of the MSM7K and depends on a shared memory
576 interface to the ARM9 modem processor which runs the baseband stack
577 and controls some vital subsystems (clock and power control, etc).
584 select ARCH_MAY_HAVE_PC_FDC
585 select HAVE_PATA_PLATFORM
588 select ARCH_SPARSEMEM_ENABLE
590 On the Acorn Risc-PC, Linux can support the internal IDE disk and
591 CD-ROM interface, serial and parallel port, and the floppy drive.
597 select ARCH_SPARSEMEM_ENABLE
599 select ARCH_HAS_CPUFREQ
602 select GENERIC_CLOCKEVENTS
605 select ARCH_REQUIRE_GPIOLIB
607 Support for StrongARM 11x0 based boards.
610 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
612 select ARCH_HAS_CPUFREQ
615 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
616 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
617 the Samsung SMDK2410 development board (and derivatives).
620 bool "Samsung S3C64XX"
623 select ARCH_HAS_CPUFREQ
625 Samsung S3C64XX series based systems
628 bool "Samsung S5PC1XX"
633 Samsung S5PC1XX series based systems
643 Support for the StrongARM based Digital DNARD machine, also known
644 as "Shark" (<http://www.shark-linux.de/shark.html>).
649 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
650 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
652 Say Y here for systems based on one of the Sharp LH7A40X
653 System on a Chip processors. These CPUs include an ARM922T
654 core with a wide array of integrated devices for
655 hand-held and low-power applications.
658 bool "ST-Ericsson U300 Series"
665 select GENERIC_CLOCKEVENTS
670 Support for ST-Ericsson U300 series mobile platforms.
676 select GENERIC_CLOCKEVENTS
678 select ARCH_REQUIRE_GPIOLIB
683 select GENERIC_ALLOCATOR
685 Support for TI's DaVinci platform.
691 select ARCH_REQUIRE_GPIOLIB
692 select ARCH_HAS_CPUFREQ
694 select GENERIC_CLOCKEVENTS
696 Support for TI's OMAP platform (OMAP1 and OMAP2).
699 bool "Broadcom BCMRING"
705 select GENERIC_CLOCKEVENTS
706 select ARCH_WANT_OPTIONAL_GPIOLIB
708 Support for Broadcom's BCMRing platform.
711 bool "Rockchip Soc Rk29"
715 select HAVE_SCHED_CLOCK
716 select ARCH_HAS_CPUFREQ
718 select GENERIC_CLOCKEVENTS
719 select ARCH_REQUIRE_GPIOLIB
725 Support for Rockchip RK29 soc.
729 source "arch/arm/mach-clps711x/Kconfig"
731 source "arch/arm/mach-ep93xx/Kconfig"
733 source "arch/arm/mach-footbridge/Kconfig"
735 source "arch/arm/mach-gemini/Kconfig"
737 source "arch/arm/mach-integrator/Kconfig"
739 source "arch/arm/mach-iop32x/Kconfig"
741 source "arch/arm/mach-iop33x/Kconfig"
743 source "arch/arm/mach-iop13xx/Kconfig"
745 source "arch/arm/mach-ixp4xx/Kconfig"
747 source "arch/arm/mach-ixp2000/Kconfig"
749 source "arch/arm/mach-ixp23xx/Kconfig"
751 source "arch/arm/mach-loki/Kconfig"
753 source "arch/arm/mach-mv78xx0/Kconfig"
755 source "arch/arm/mach-pxa/Kconfig"
756 source "arch/arm/plat-pxa/Kconfig"
758 source "arch/arm/mach-mmp/Kconfig"
760 source "arch/arm/mach-sa1100/Kconfig"
762 source "arch/arm/plat-omap/Kconfig"
764 source "arch/arm/mach-omap1/Kconfig"
766 source "arch/arm/mach-omap2/Kconfig"
768 source "arch/arm/mach-orion5x/Kconfig"
770 source "arch/arm/mach-kirkwood/Kconfig"
772 source "arch/arm/plat-s3c24xx/Kconfig"
773 source "arch/arm/plat-s3c64xx/Kconfig"
774 source "arch/arm/plat-s3c/Kconfig"
775 source "arch/arm/plat-s5pc1xx/Kconfig"
778 source "arch/arm/mach-s3c2400/Kconfig"
779 source "arch/arm/mach-s3c2410/Kconfig"
780 source "arch/arm/mach-s3c2412/Kconfig"
781 source "arch/arm/mach-s3c2440/Kconfig"
782 source "arch/arm/mach-s3c2442/Kconfig"
783 source "arch/arm/mach-s3c2443/Kconfig"
787 source "arch/arm/mach-s3c6400/Kconfig"
788 source "arch/arm/mach-s3c6410/Kconfig"
791 source "arch/arm/plat-stmp3xxx/Kconfig"
794 source "arch/arm/mach-s5pc100/Kconfig"
797 source "arch/arm/mach-lh7a40x/Kconfig"
799 source "arch/arm/mach-h720x/Kconfig"
801 source "arch/arm/mach-versatile/Kconfig"
803 source "arch/arm/mach-aaec2000/Kconfig"
805 source "arch/arm/mach-realview/Kconfig"
807 source "arch/arm/mach-at91/Kconfig"
809 source "arch/arm/plat-mxc/Kconfig"
811 source "arch/arm/mach-nomadik/Kconfig"
813 source "arch/arm/mach-netx/Kconfig"
815 source "arch/arm/mach-ns9xxx/Kconfig"
817 source "arch/arm/mach-davinci/Kconfig"
819 source "arch/arm/mach-ks8695/Kconfig"
821 source "arch/arm/mach-msm/Kconfig"
823 source "arch/arm/mach-u300/Kconfig"
825 source "arch/arm/mach-w90x900/Kconfig"
827 source "arch/arm/mach-bcmring/Kconfig"
829 source "arch/arm/mach-rk29/Kconfig"
831 # Definitions to make life easier
844 source arch/arm/mm/Kconfig
847 bool "Enable iWMMXt support"
848 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
849 default y if PXA27x || PXA3xx || ARCH_MMP
851 Enable support for iWMMXt context switching at run time if
852 running on a CPU that supports it.
854 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
857 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
861 source "arch/arm/Kconfig-nommu"
864 config ARM_ERRATA_411920
865 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
866 depends on CPU_V6 && !SMP
868 Invalidation of the Instruction Cache operation can
869 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
870 It does not affect the MPCore. This option enables the ARM Ltd.
871 recommended workaround.
873 config ARM_ERRATA_430973
874 bool "ARM errata: Stale prediction on replaced interworking branch"
877 This option enables the workaround for the 430973 Cortex-A8
878 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
879 interworking branch is replaced with another code sequence at the
880 same virtual address, whether due to self-modifying code or virtual
881 to physical address re-mapping, Cortex-A8 does not recover from the
882 stale interworking branch prediction. This results in Cortex-A8
883 executing the new code sequence in the incorrect ARM or Thumb state.
884 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
885 and also flushes the branch target cache at every context switch.
886 Note that setting specific bits in the ACTLR register may not be
887 available in non-secure mode.
889 config ARM_ERRATA_458693
890 bool "ARM errata: Processor deadlock when a false hazard is created"
893 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
894 erratum. For very specific sequences of memory operations, it is
895 possible for a hazard condition intended for a cache line to instead
896 be incorrectly associated with a different cache line. This false
897 hazard might then cause a processor deadlock. The workaround enables
898 the L1 caching of the NEON accesses and disables the PLD instruction
899 in the ACTLR register. Note that setting specific bits in the ACTLR
900 register may not be available in non-secure mode.
902 config ARM_ERRATA_460075
903 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
906 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
907 erratum. Any asynchronous access to the L2 cache may encounter a
908 situation in which recent store transactions to the L2 cache are lost
909 and overwritten with stale memory contents from external memory. The
910 workaround disables the write-allocate mode for the L2 cache via the
911 ACTLR register. Note that setting specific bits in the ACTLR register
912 may not be available in non-secure mode.
914 config ARM_ERRATA_720789
915 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
916 depends on CPU_V7 && SMP
918 This option enables the workaround for the 720789 Cortex-A9 (prior to
919 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
920 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
921 As a consequence of this erratum, some TLB entries which should be
922 invalidated are not, resulting in an incoherency in the system page
923 tables. The workaround changes the TLB flushing routines to invalidate
924 entries regardless of the ASID.
928 source "arch/arm/common/Kconfig"
930 config FORCE_MAX_ZONEORDER
943 Find out whether you have ISA slots on your motherboard. ISA is the
944 name of a bus system, i.e. the way the CPU talks to the other stuff
945 inside your box. Other bus systems are PCI, EISA, MicroChannel
946 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
947 newer boards don't support it. If you have ISA, say Y, otherwise N.
949 # Select ISA DMA controller support
954 # Select ISA DMA interface
959 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
961 Find out whether you have a PCI motherboard. PCI is the name of a
962 bus system, i.e. the way the CPU talks to the other stuff inside
963 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
964 VESA. If you have PCI, say Y, otherwise N.
969 # Select the host bridge type
970 config PCI_HOST_VIA82C505
972 depends on PCI && ARCH_SHARK
975 config PCI_HOST_ITE8152
977 depends on PCI && MACH_ARMCORE
981 source "drivers/pci/Kconfig"
983 source "drivers/pcmcia/Kconfig"
987 menu "Kernel Features"
989 source "kernel/time/Kconfig"
992 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
993 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
994 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
995 depends on GENERIC_CLOCKEVENTS
996 select USE_GENERIC_SMP_HELPERS
997 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
999 This enables support for systems with more than one CPU. If you have
1000 a system with only one CPU, like most personal computers, say N. If
1001 you have a system with more than one CPU, say Y.
1003 If you say N here, the kernel will run on single and multiprocessor
1004 machines, but will use only one CPU of a multiprocessor machine. If
1005 you say Y here, the kernel will run on many, but not all, single
1006 processor machines. On a single processor machine, the kernel will
1007 run faster if you say N here.
1009 See also <file:Documentation/i386/IO-APIC.txt>,
1010 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1011 <http://www.linuxdoc.org/docs.html#howto>.
1013 If you don't know what to do here, say N.
1019 This option enables support for the ARM system coherency unit
1025 This options enables support for the ARM timer and watchdog unit
1028 prompt "Memory split"
1031 Select the desired split between kernel and user memory.
1033 If you are not absolutely sure what you are doing, leave this
1037 bool "3G/1G user/kernel split"
1039 bool "2G/2G user/kernel split"
1041 bool "1G/3G user/kernel split"
1046 default 0x40000000 if VMSPLIT_1G
1047 default 0x80000000 if VMSPLIT_2G
1051 int "Maximum number of CPUs (2-32)"
1057 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1058 depends on SMP && HOTPLUG && EXPERIMENTAL
1060 Say Y here to experiment with turning CPUs off and on. CPUs
1061 can be controlled through /sys/devices/system/cpu.
1064 bool "Use local timer interrupts"
1065 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1066 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1068 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
1070 Enable support for local timers on SMP platforms, rather then the
1071 legacy IPI broadcast method. Local timers allows the system
1072 accounting to be spread across the timer interval, preventing a
1073 "thundering herd" at every timer tick.
1075 source kernel/Kconfig.preempt
1079 default 128 if ARCH_L7200
1080 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1081 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1082 default AT91_TIMER_HZ if ARCH_AT91
1085 config THUMB2_KERNEL
1086 bool "Compile the kernel in Thumb-2 mode"
1087 depends on CPU_V7 && EXPERIMENTAL
1089 select ARM_ASM_UNIFIED
1091 By enabling this option, the kernel will be compiled in
1092 Thumb-2 mode. A compiler/assembler that understand the unified
1093 ARM-Thumb syntax is needed.
1097 config ARM_ASM_UNIFIED
1101 bool "Use the ARM EABI to compile the kernel"
1103 This option allows for the kernel to be compiled using the latest
1104 ARM ABI (aka EABI). This is only useful if you are using a user
1105 space environment that is also compiled with EABI.
1107 Since there are major incompatibilities between the legacy ABI and
1108 EABI, especially with regard to structure member alignment, this
1109 option also changes the kernel syscall calling convention to
1110 disambiguate both ABIs and allow for backward compatibility support
1111 (selected with CONFIG_OABI_COMPAT).
1113 To use this you need GCC version 4.0.0 or later.
1116 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1117 depends on AEABI && EXPERIMENTAL
1120 This option preserves the old syscall interface along with the
1121 new (ARM EABI) one. It also provides a compatibility layer to
1122 intercept syscalls that have structure arguments which layout
1123 in memory differs between the legacy ABI and the new ARM EABI
1124 (only for non "thumb" binaries). This option adds a tiny
1125 overhead to all syscalls and produces a slightly larger kernel.
1126 If you know you'll be using only pure EABI user space then you
1127 can say N here. If this option is not selected and you attempt
1128 to execute a legacy ABI binary then the result will be
1129 UNPREDICTABLE (in fact it can be predicted that it won't work
1130 at all). If in doubt say Y.
1132 config ARCH_HAS_HOLES_MEMORYMODEL
1135 # Discontigmem is deprecated
1136 config ARCH_DISCONTIGMEM_ENABLE
1139 config ARCH_SPARSEMEM_ENABLE
1142 config ARCH_SPARSEMEM_DEFAULT
1143 def_bool ARCH_SPARSEMEM_ENABLE
1145 config ARCH_SELECT_MEMORY_MODEL
1146 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1150 default "4" if ARCH_LH7A40X
1152 depends on NEED_MULTIPLE_NODES
1155 bool "High Memory Support (EXPERIMENTAL)"
1156 depends on MMU && EXPERIMENTAL
1158 The address space of ARM processors is only 4 Gigabytes large
1159 and it has to accommodate user address space, kernel address
1160 space as well as some memory mapped IO. That means that, if you
1161 have a large amount of physical memory and/or IO, not all of the
1162 memory can be "permanently mapped" by the kernel. The physical
1163 memory that is not permanently mapped is called "high memory".
1165 Depending on the selected kernel/user memory split, minimum
1166 vmalloc space and actual amount of RAM, you may not need this
1167 option which should result in a slightly faster kernel.
1172 bool "Allocate 2nd-level pagetables from highmem"
1174 depends on !OUTER_CACHE
1179 bool "Timer and CPU usage LEDs"
1180 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1181 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1182 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1183 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1184 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1185 ARCH_AT91 || ARCH_DAVINCI || \
1186 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1188 If you say Y here, the LEDs on your machine will be used
1189 to provide useful information about your current system status.
1191 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1192 be able to select which LEDs are active using the options below. If
1193 you are compiling a kernel for the EBSA-110 or the LART however, the
1194 red LED will simply flash regularly to indicate that the system is
1195 still functional. It is safe to say Y here if you have a CATS
1196 system, but the driver will do nothing.
1199 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1200 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1201 || MACH_OMAP_PERSEUS2
1203 depends on !GENERIC_CLOCKEVENTS
1204 default y if ARCH_EBSA110
1206 If you say Y here, one of the system LEDs (the green one on the
1207 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1208 will flash regularly to indicate that the system is still
1209 operational. This is mainly useful to kernel hackers who are
1210 debugging unstable kernels.
1212 The LART uses the same LED for both Timer LED and CPU usage LED
1213 functions. You may choose to use both, but the Timer LED function
1214 will overrule the CPU usage LED.
1217 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1219 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1220 || MACH_OMAP_PERSEUS2
1223 If you say Y here, the red LED will be used to give a good real
1224 time indication of CPU usage, by lighting whenever the idle task
1225 is not currently executing.
1227 The LART uses the same LED for both Timer LED and CPU usage LED
1228 functions. You may choose to use both, but the Timer LED function
1229 will overrule the CPU usage LED.
1231 config ALIGNMENT_TRAP
1233 depends on CPU_CP15_MMU
1234 default y if !ARCH_EBSA110
1236 ARM processors cannot fetch/store information which is not
1237 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1238 address divisible by 4. On 32-bit ARM processors, these non-aligned
1239 fetch/store instructions will be emulated in software if you say
1240 here, which has a severe performance impact. This is necessary for
1241 correct operation of some network protocols. With an IP-only
1242 configuration it is safe to say N, otherwise say Y.
1244 config UACCESS_WITH_MEMCPY
1245 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1246 depends on MMU && EXPERIMENTAL
1247 default y if CPU_FEROCEON
1249 Implement faster copy_to_user and clear_user methods for CPU
1250 cores where a 8-word STM instruction give significantly higher
1251 memory write throughput than a sequence of individual 32bit stores.
1253 A possible side effect is a slight increase in scheduling latency
1254 between threads sharing the same address space if they invoke
1255 such copy operations with large buffers.
1257 However, if the CPU data cache is using a write-allocate mode,
1258 this option is unlikely to provide any performance gain.
1264 # Compressed boot loader in ROM. Yes, we really want to ask about
1265 # TEXT and BSS so we preserve their values in the config files.
1266 config ZBOOT_ROM_TEXT
1267 hex "Compressed ROM boot loader base address"
1270 The physical address at which the ROM-able zImage is to be
1271 placed in the target. Platforms which normally make use of
1272 ROM-able zImage formats normally set this to a suitable
1273 value in their defconfig file.
1275 If ZBOOT_ROM is not enabled, this has no effect.
1277 config ZBOOT_ROM_BSS
1278 hex "Compressed ROM boot loader BSS address"
1281 The base address of an area of read/write memory in the target
1282 for the ROM-able zImage which must be available while the
1283 decompressor is running. It must be large enough to hold the
1284 entire decompressed kernel plus an additional 128 KiB.
1285 Platforms which normally make use of ROM-able zImage formats
1286 normally set this to a suitable value in their defconfig file.
1288 If ZBOOT_ROM is not enabled, this has no effect.
1291 bool "Compressed boot loader in ROM/flash"
1292 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1294 Say Y here if you intend to execute your compressed kernel image
1295 (zImage) directly from ROM or flash. If unsure, say N.
1298 string "Default kernel command string"
1301 On some architectures (EBSA110 and CATS), there is currently no way
1302 for the boot loader to pass arguments to the kernel. For these
1303 architectures, you should supply some command-line options at build
1304 time by entering them here. As a minimum, you should specify the
1305 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1308 bool "Kernel Execute-In-Place from ROM"
1309 depends on !ZBOOT_ROM
1311 Execute-In-Place allows the kernel to run from non-volatile storage
1312 directly addressable by the CPU, such as NOR flash. This saves RAM
1313 space since the text section of the kernel is not loaded from flash
1314 to RAM. Read-write sections, such as the data section and stack,
1315 are still copied to RAM. The XIP kernel is not compressed since
1316 it has to run directly from flash, so it will take more space to
1317 store it. The flash address used to link the kernel object files,
1318 and for storing it, is configuration dependent. Therefore, if you
1319 say Y here, you must know the proper physical address where to
1320 store the kernel image depending on your own flash memory usage.
1322 Also note that the make target becomes "make xipImage" rather than
1323 "make zImage" or "make Image". The final kernel binary to put in
1324 ROM memory will be arch/arm/boot/xipImage.
1328 config XIP_PHYS_ADDR
1329 hex "XIP Kernel Physical Location"
1330 depends on XIP_KERNEL
1331 default "0x00080000"
1333 This is the physical address in your flash memory the kernel will
1334 be linked for and stored to. This address is dependent on your
1338 bool "Kexec system call (EXPERIMENTAL)"
1339 depends on EXPERIMENTAL
1341 kexec is a system call that implements the ability to shutdown your
1342 current kernel, and to start another kernel. It is like a reboot
1343 but it is independent of the system firmware. And like a reboot
1344 you can start any kernel with it, not just Linux.
1346 It is an ongoing process to be certain the hardware in a machine
1347 is properly shutdown, so do not be surprised if this code does not
1348 initially work for you. It may help to enable device hotplugging
1352 bool "Export atags in procfs"
1356 Should the atags used to boot the kernel be exported in an "atags"
1357 file in procfs. Useful with kexec.
1361 menu "CPU Power Management"
1365 source "drivers/cpufreq/Kconfig"
1367 config CPU_FREQ_SA1100
1369 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1372 config CPU_FREQ_SA1110
1374 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1377 config CPU_FREQ_INTEGRATOR
1378 tristate "CPUfreq driver for ARM Integrator CPUs"
1379 depends on ARCH_INTEGRATOR && CPU_FREQ
1382 This enables the CPUfreq driver for ARM Integrator CPUs.
1384 For details, take a look at <file:Documentation/cpu-freq>.
1390 depends on CPU_FREQ && ARCH_PXA && PXA25x
1392 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1394 config CPU_FREQ_S3C64XX
1395 bool "CPUfreq support for Samsung S3C64XX CPUs"
1396 depends on CPU_FREQ && CPU_S3C6410
1401 Internal configuration node for common cpufreq on Samsung SoC
1403 config CPU_FREQ_S3C24XX
1404 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1405 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1408 This enables the CPUfreq driver for the Samsung S3C24XX family
1411 For details, take a look at <file:Documentation/cpu-freq>.
1415 config CPU_FREQ_S3C24XX_PLL
1416 bool "Support CPUfreq changing of PLL frequency"
1417 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1419 Compile in support for changing the PLL frequency from the
1420 S3C24XX series CPUfreq driver. The PLL takes time to settle
1421 after a frequency change, so by default it is not enabled.
1423 This also means that the PLL tables for the selected CPU(s) will
1424 be built which may increase the size of the kernel image.
1426 config CPU_FREQ_S3C24XX_DEBUG
1427 bool "Debug CPUfreq Samsung driver core"
1428 depends on CPU_FREQ_S3C24XX
1430 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1432 config CPU_FREQ_S3C24XX_IODEBUG
1433 bool "Debug CPUfreq Samsung driver IO timing"
1434 depends on CPU_FREQ_S3C24XX
1436 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1438 config CPU_FREQ_S3C24XX_DEBUGFS
1439 bool "Export debugfs for CPUFreq"
1440 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1442 Export status information via debugfs.
1446 source "drivers/cpuidle/Kconfig"
1450 menu "Floating point emulation"
1452 comment "At least one emulation must be selected"
1455 bool "NWFPE math emulation"
1456 depends on !AEABI || OABI_COMPAT
1458 Say Y to include the NWFPE floating point emulator in the kernel.
1459 This is necessary to run most binaries. Linux does not currently
1460 support floating point hardware so you need to say Y here even if
1461 your machine has an FPA or floating point co-processor podule.
1463 You may say N here if you are going to load the Acorn FPEmulator
1464 early in the bootup.
1467 bool "Support extended precision"
1468 depends on FPE_NWFPE
1470 Say Y to include 80-bit support in the kernel floating-point
1471 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1472 Note that gcc does not generate 80-bit operations by default,
1473 so in most cases this option only enlarges the size of the
1474 floating point emulator without any good reason.
1476 You almost surely want to say N here.
1479 bool "FastFPE math emulation (EXPERIMENTAL)"
1480 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1482 Say Y here to include the FAST floating point emulator in the kernel.
1483 This is an experimental much faster emulator which now also has full
1484 precision for the mantissa. It does not support any exceptions.
1485 It is very simple, and approximately 3-6 times faster than NWFPE.
1487 It should be sufficient for most programs. It may be not suitable
1488 for scientific calculations, but you have to check this for yourself.
1489 If you do not feel you need a faster FP emulation you should better
1493 bool "VFP-format floating point maths"
1494 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1496 Say Y to include VFP support code in the kernel. This is needed
1497 if your hardware includes a VFP unit.
1499 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1500 release notes and additional status information.
1502 Say N if your target does not have VFP hardware.
1510 bool "Advanced SIMD (NEON) Extension support"
1511 depends on VFPv3 && CPU_V7
1513 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1518 menu "Userspace binary formats"
1520 source "fs/Kconfig.binfmt"
1523 tristate "RISC OS personality"
1526 Say Y here to include the kernel code necessary if you want to run
1527 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1528 experimental; if this sounds frightening, say N and sleep in peace.
1529 You can also say M here to compile this support as a module (which
1530 will be called arthur).
1534 menu "Power management options"
1536 source "kernel/power/Kconfig"
1538 config ARCH_SUSPEND_POSSIBLE
1543 source "net/Kconfig"
1545 source "drivers/Kconfig"
1549 source "arch/arm/Kconfig.debug"
1551 source "security/Kconfig"
1553 source "crypto/Kconfig"
1555 source "lib/Kconfig"