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).
588 bool "Renesas SH-Mobile"
590 Support for Renesas's SH-Mobile ARM platforms
597 select ARCH_MAY_HAVE_PC_FDC
598 select HAVE_PATA_PLATFORM
601 select ARCH_SPARSEMEM_ENABLE
603 On the Acorn Risc-PC, Linux can support the internal IDE disk and
604 CD-ROM interface, serial and parallel port, and the floppy drive.
610 select ARCH_SPARSEMEM_ENABLE
612 select ARCH_HAS_CPUFREQ
616 select GENERIC_CLOCKEVENTS
619 select ARCH_REQUIRE_GPIOLIB
621 Support for StrongARM 11x0 based boards.
624 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
626 select ARCH_HAS_CPUFREQ
629 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
630 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
631 the Samsung SMDK2410 development board (and derivatives).
634 bool "Samsung S3C64XX"
637 select ARCH_HAS_CPUFREQ
639 Samsung S3C64XX series based systems
642 bool "Samsung S5PC1XX"
647 Samsung S5PC1XX series based systems
657 Support for the StrongARM based Digital DNARD machine, also known
658 as "Shark" (<http://www.shark-linux.de/shark.html>).
663 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
664 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
666 Say Y here for systems based on one of the Sharp LH7A40X
667 System on a Chip processors. These CPUs include an ARM922T
668 core with a wide array of integrated devices for
669 hand-held and low-power applications.
672 bool "ST-Ericsson U300 Series"
679 select GENERIC_CLOCKEVENTS
684 Support for ST-Ericsson U300 series mobile platforms.
690 select GENERIC_CLOCKEVENTS
692 select ARCH_REQUIRE_GPIOLIB
697 select GENERIC_ALLOCATOR
698 select ARCH_HAS_HOLES_MEMORYMODEL
700 Support for TI's DaVinci platform.
706 select ARCH_REQUIRE_GPIOLIB
707 select ARCH_HAS_CPUFREQ
709 select GENERIC_CLOCKEVENTS
710 select ARCH_HAS_HOLES_MEMORYMODEL
712 Support for TI's OMAP platform (OMAP1 and OMAP2).
715 bool "Broadcom BCMRING"
721 select GENERIC_CLOCKEVENTS
722 select ARCH_WANT_OPTIONAL_GPIOLIB
724 Support for Broadcom's BCMRing platform.
727 bool "ST-Ericsson U8500 Series"
731 select GENERIC_CLOCKEVENTS
734 Support for ST-Ericsson's Ux500 architecture
738 source "arch/arm/mach-aaec2000/Kconfig"
740 source "arch/arm/mach-at91/Kconfig"
742 source "arch/arm/mach-bcmring/Kconfig"
744 source "arch/arm/mach-clps711x/Kconfig"
746 source "arch/arm/mach-davinci/Kconfig"
748 source "arch/arm/mach-dove/Kconfig"
750 source "arch/arm/mach-ep93xx/Kconfig"
752 source "arch/arm/mach-footbridge/Kconfig"
754 source "arch/arm/mach-gemini/Kconfig"
756 source "arch/arm/mach-h720x/Kconfig"
758 source "arch/arm/mach-integrator/Kconfig"
760 source "arch/arm/mach-iop32x/Kconfig"
762 source "arch/arm/mach-iop33x/Kconfig"
764 source "arch/arm/mach-iop13xx/Kconfig"
766 source "arch/arm/mach-ixp4xx/Kconfig"
768 source "arch/arm/mach-ixp2000/Kconfig"
770 source "arch/arm/mach-ixp23xx/Kconfig"
772 source "arch/arm/mach-kirkwood/Kconfig"
774 source "arch/arm/mach-ks8695/Kconfig"
776 source "arch/arm/mach-lh7a40x/Kconfig"
778 source "arch/arm/mach-loki/Kconfig"
780 source "arch/arm/mach-msm/Kconfig"
782 source "arch/arm/mach-mv78xx0/Kconfig"
784 source "arch/arm/plat-mxc/Kconfig"
786 source "arch/arm/mach-netx/Kconfig"
788 source "arch/arm/mach-nomadik/Kconfig"
789 source "arch/arm/plat-nomadik/Kconfig"
791 source "arch/arm/mach-ns9xxx/Kconfig"
793 source "arch/arm/plat-omap/Kconfig"
795 source "arch/arm/mach-omap1/Kconfig"
797 source "arch/arm/mach-omap2/Kconfig"
799 source "arch/arm/mach-orion5x/Kconfig"
801 source "arch/arm/mach-pxa/Kconfig"
802 source "arch/arm/plat-pxa/Kconfig"
804 source "arch/arm/mach-mmp/Kconfig"
806 source "arch/arm/mach-realview/Kconfig"
808 source "arch/arm/mach-sa1100/Kconfig"
810 source "arch/arm/plat-samsung/Kconfig"
811 source "arch/arm/plat-s3c24xx/Kconfig"
812 source "arch/arm/plat-s3c64xx/Kconfig"
813 source "arch/arm/plat-s3c/Kconfig"
814 source "arch/arm/plat-s5pc1xx/Kconfig"
817 source "arch/arm/mach-s3c2400/Kconfig"
818 source "arch/arm/mach-s3c2410/Kconfig"
819 source "arch/arm/mach-s3c2412/Kconfig"
820 source "arch/arm/mach-s3c2440/Kconfig"
821 source "arch/arm/mach-s3c2442/Kconfig"
822 source "arch/arm/mach-s3c2443/Kconfig"
826 source "arch/arm/mach-s3c6400/Kconfig"
827 source "arch/arm/mach-s3c6410/Kconfig"
830 source "arch/arm/mach-shmobile/Kconfig"
832 source "arch/arm/plat-stmp3xxx/Kconfig"
835 source "arch/arm/mach-s5pc100/Kconfig"
838 source "arch/arm/mach-u300/Kconfig"
840 source "arch/arm/mach-ux500/Kconfig"
842 source "arch/arm/mach-versatile/Kconfig"
844 source "arch/arm/mach-w90x900/Kconfig"
846 # Definitions to make life easier
852 select GENERIC_CLOCKEVENTS
861 source arch/arm/mm/Kconfig
864 bool "Enable iWMMXt support"
865 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
866 default y if PXA27x || PXA3xx || ARCH_MMP
868 Enable support for iWMMXt context switching at run time if
869 running on a CPU that supports it.
871 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
874 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
878 source "arch/arm/Kconfig-nommu"
881 config ARM_ERRATA_411920
882 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
883 depends on CPU_V6 && !SMP
885 Invalidation of the Instruction Cache operation can
886 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
887 It does not affect the MPCore. This option enables the ARM Ltd.
888 recommended workaround.
890 config ARM_ERRATA_430973
891 bool "ARM errata: Stale prediction on replaced interworking branch"
894 This option enables the workaround for the 430973 Cortex-A8
895 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
896 interworking branch is replaced with another code sequence at the
897 same virtual address, whether due to self-modifying code or virtual
898 to physical address re-mapping, Cortex-A8 does not recover from the
899 stale interworking branch prediction. This results in Cortex-A8
900 executing the new code sequence in the incorrect ARM or Thumb state.
901 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
902 and also flushes the branch target cache at every context switch.
903 Note that setting specific bits in the ACTLR register may not be
904 available in non-secure mode.
906 config ARM_ERRATA_458693
907 bool "ARM errata: Processor deadlock when a false hazard is created"
910 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
911 erratum. For very specific sequences of memory operations, it is
912 possible for a hazard condition intended for a cache line to instead
913 be incorrectly associated with a different cache line. This false
914 hazard might then cause a processor deadlock. The workaround enables
915 the L1 caching of the NEON accesses and disables the PLD instruction
916 in the ACTLR register. Note that setting specific bits in the ACTLR
917 register may not be available in non-secure mode.
919 config ARM_ERRATA_460075
920 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
923 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
924 erratum. Any asynchronous access to the L2 cache may encounter a
925 situation in which recent store transactions to the L2 cache are lost
926 and overwritten with stale memory contents from external memory. The
927 workaround disables the write-allocate mode for the L2 cache via the
928 ACTLR register. Note that setting specific bits in the ACTLR register
929 may not be available in non-secure mode.
933 source "arch/arm/common/Kconfig"
935 config FORCE_MAX_ZONEORDER
948 Find out whether you have ISA slots on your motherboard. ISA is the
949 name of a bus system, i.e. the way the CPU talks to the other stuff
950 inside your box. Other bus systems are PCI, EISA, MicroChannel
951 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
952 newer boards don't support it. If you have ISA, say Y, otherwise N.
954 # Select ISA DMA controller support
959 # Select ISA DMA interface
964 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
966 Find out whether you have a PCI motherboard. PCI is the name of a
967 bus system, i.e. the way the CPU talks to the other stuff inside
968 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
969 VESA. If you have PCI, say Y, otherwise N.
974 # Select the host bridge type
975 config PCI_HOST_VIA82C505
977 depends on PCI && ARCH_SHARK
980 config PCI_HOST_ITE8152
982 depends on PCI && MACH_ARMCORE
986 source "drivers/pci/Kconfig"
988 source "drivers/pcmcia/Kconfig"
992 menu "Kernel Features"
994 source "kernel/time/Kconfig"
997 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
998 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
999 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1000 depends on GENERIC_CLOCKEVENTS
1001 select USE_GENERIC_SMP_HELPERS
1002 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1004 This enables support for systems with more than one CPU. If you have
1005 a system with only one CPU, like most personal computers, say N. If
1006 you have a system with more than one CPU, say Y.
1008 If you say N here, the kernel will run on single and multiprocessor
1009 machines, but will use only one CPU of a multiprocessor machine. If
1010 you say Y here, the kernel will run on many, but not all, single
1011 processor machines. On a single processor machine, the kernel will
1012 run faster if you say N here.
1014 See also <file:Documentation/i386/IO-APIC.txt>,
1015 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1016 <http://www.linuxdoc.org/docs.html#howto>.
1018 If you don't know what to do here, say N.
1024 This option enables support for the ARM system coherency unit
1030 This options enables support for the ARM timer and watchdog unit
1033 prompt "Memory split"
1036 Select the desired split between kernel and user memory.
1038 If you are not absolutely sure what you are doing, leave this
1042 bool "3G/1G user/kernel split"
1044 bool "2G/2G user/kernel split"
1046 bool "1G/3G user/kernel split"
1051 default 0x40000000 if VMSPLIT_1G
1052 default 0x80000000 if VMSPLIT_2G
1056 int "Maximum number of CPUs (2-32)"
1062 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1063 depends on SMP && HOTPLUG && EXPERIMENTAL
1065 Say Y here to experiment with turning CPUs off and on. CPUs
1066 can be controlled through /sys/devices/system/cpu.
1069 bool "Use local timer interrupts"
1070 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1071 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1073 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1075 Enable support for local timers on SMP platforms, rather then the
1076 legacy IPI broadcast method. Local timers allows the system
1077 accounting to be spread across the timer interval, preventing a
1078 "thundering herd" at every timer tick.
1080 source kernel/Kconfig.preempt
1084 default 128 if ARCH_L7200
1085 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1086 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1087 default AT91_TIMER_HZ if ARCH_AT91
1090 config THUMB2_KERNEL
1091 bool "Compile the kernel in Thumb-2 mode"
1092 depends on CPU_V7 && EXPERIMENTAL
1094 select ARM_ASM_UNIFIED
1096 By enabling this option, the kernel will be compiled in
1097 Thumb-2 mode. A compiler/assembler that understand the unified
1098 ARM-Thumb syntax is needed.
1102 config ARM_ASM_UNIFIED
1106 bool "Use the ARM EABI to compile the kernel"
1108 This option allows for the kernel to be compiled using the latest
1109 ARM ABI (aka EABI). This is only useful if you are using a user
1110 space environment that is also compiled with EABI.
1112 Since there are major incompatibilities between the legacy ABI and
1113 EABI, especially with regard to structure member alignment, this
1114 option also changes the kernel syscall calling convention to
1115 disambiguate both ABIs and allow for backward compatibility support
1116 (selected with CONFIG_OABI_COMPAT).
1118 To use this you need GCC version 4.0.0 or later.
1121 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1122 depends on AEABI && EXPERIMENTAL
1125 This option preserves the old syscall interface along with the
1126 new (ARM EABI) one. It also provides a compatibility layer to
1127 intercept syscalls that have structure arguments which layout
1128 in memory differs between the legacy ABI and the new ARM EABI
1129 (only for non "thumb" binaries). This option adds a tiny
1130 overhead to all syscalls and produces a slightly larger kernel.
1131 If you know you'll be using only pure EABI user space then you
1132 can say N here. If this option is not selected and you attempt
1133 to execute a legacy ABI binary then the result will be
1134 UNPREDICTABLE (in fact it can be predicted that it won't work
1135 at all). If in doubt say Y.
1137 config ARCH_HAS_HOLES_MEMORYMODEL
1140 # Discontigmem is deprecated
1141 config ARCH_DISCONTIGMEM_ENABLE
1144 config ARCH_SPARSEMEM_ENABLE
1147 config ARCH_SPARSEMEM_DEFAULT
1148 def_bool ARCH_SPARSEMEM_ENABLE
1150 config ARCH_SELECT_MEMORY_MODEL
1151 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1155 default "4" if ARCH_LH7A40X
1157 depends on NEED_MULTIPLE_NODES
1160 bool "High Memory Support (EXPERIMENTAL)"
1161 depends on MMU && EXPERIMENTAL
1163 The address space of ARM processors is only 4 Gigabytes large
1164 and it has to accommodate user address space, kernel address
1165 space as well as some memory mapped IO. That means that, if you
1166 have a large amount of physical memory and/or IO, not all of the
1167 memory can be "permanently mapped" by the kernel. The physical
1168 memory that is not permanently mapped is called "high memory".
1170 Depending on the selected kernel/user memory split, minimum
1171 vmalloc space and actual amount of RAM, you may not need this
1172 option which should result in a slightly faster kernel.
1177 bool "Allocate 2nd-level pagetables from highmem"
1179 depends on !OUTER_CACHE
1184 bool "Timer and CPU usage LEDs"
1185 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1186 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1187 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1188 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1189 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1190 ARCH_AT91 || ARCH_DAVINCI || \
1191 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1193 If you say Y here, the LEDs on your machine will be used
1194 to provide useful information about your current system status.
1196 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1197 be able to select which LEDs are active using the options below. If
1198 you are compiling a kernel for the EBSA-110 or the LART however, the
1199 red LED will simply flash regularly to indicate that the system is
1200 still functional. It is safe to say Y here if you have a CATS
1201 system, but the driver will do nothing.
1204 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1205 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1206 || MACH_OMAP_PERSEUS2
1208 depends on !GENERIC_CLOCKEVENTS
1209 default y if ARCH_EBSA110
1211 If you say Y here, one of the system LEDs (the green one on the
1212 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1213 will flash regularly to indicate that the system is still
1214 operational. This is mainly useful to kernel hackers who are
1215 debugging unstable kernels.
1217 The LART uses the same LED for both Timer LED and CPU usage LED
1218 functions. You may choose to use both, but the Timer LED function
1219 will overrule the CPU usage LED.
1222 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1224 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1225 || MACH_OMAP_PERSEUS2
1228 If you say Y here, the red LED will be used to give a good real
1229 time indication of CPU usage, by lighting whenever the idle task
1230 is not currently executing.
1232 The LART uses the same LED for both Timer LED and CPU usage LED
1233 functions. You may choose to use both, but the Timer LED function
1234 will overrule the CPU usage LED.
1236 config ALIGNMENT_TRAP
1238 depends on CPU_CP15_MMU
1239 default y if !ARCH_EBSA110
1241 ARM processors cannot fetch/store information which is not
1242 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1243 address divisible by 4. On 32-bit ARM processors, these non-aligned
1244 fetch/store instructions will be emulated in software if you say
1245 here, which has a severe performance impact. This is necessary for
1246 correct operation of some network protocols. With an IP-only
1247 configuration it is safe to say N, otherwise say Y.
1249 config UACCESS_WITH_MEMCPY
1250 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1251 depends on MMU && EXPERIMENTAL
1252 default y if CPU_FEROCEON
1254 Implement faster copy_to_user and clear_user methods for CPU
1255 cores where a 8-word STM instruction give significantly higher
1256 memory write throughput than a sequence of individual 32bit stores.
1258 A possible side effect is a slight increase in scheduling latency
1259 between threads sharing the same address space if they invoke
1260 such copy operations with large buffers.
1262 However, if the CPU data cache is using a write-allocate mode,
1263 this option is unlikely to provide any performance gain.
1269 # Compressed boot loader in ROM. Yes, we really want to ask about
1270 # TEXT and BSS so we preserve their values in the config files.
1271 config ZBOOT_ROM_TEXT
1272 hex "Compressed ROM boot loader base address"
1275 The physical address at which the ROM-able zImage is to be
1276 placed in the target. Platforms which normally make use of
1277 ROM-able zImage formats normally set this to a suitable
1278 value in their defconfig file.
1280 If ZBOOT_ROM is not enabled, this has no effect.
1282 config ZBOOT_ROM_BSS
1283 hex "Compressed ROM boot loader BSS address"
1286 The base address of an area of read/write memory in the target
1287 for the ROM-able zImage which must be available while the
1288 decompressor is running. It must be large enough to hold the
1289 entire decompressed kernel plus an additional 128 KiB.
1290 Platforms which normally make use of ROM-able zImage formats
1291 normally set this to a suitable value in their defconfig file.
1293 If ZBOOT_ROM is not enabled, this has no effect.
1296 bool "Compressed boot loader in ROM/flash"
1297 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1299 Say Y here if you intend to execute your compressed kernel image
1300 (zImage) directly from ROM or flash. If unsure, say N.
1303 string "Default kernel command string"
1306 On some architectures (EBSA110 and CATS), there is currently no way
1307 for the boot loader to pass arguments to the kernel. For these
1308 architectures, you should supply some command-line options at build
1309 time by entering them here. As a minimum, you should specify the
1310 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1313 bool "Kernel Execute-In-Place from ROM"
1314 depends on !ZBOOT_ROM
1316 Execute-In-Place allows the kernel to run from non-volatile storage
1317 directly addressable by the CPU, such as NOR flash. This saves RAM
1318 space since the text section of the kernel is not loaded from flash
1319 to RAM. Read-write sections, such as the data section and stack,
1320 are still copied to RAM. The XIP kernel is not compressed since
1321 it has to run directly from flash, so it will take more space to
1322 store it. The flash address used to link the kernel object files,
1323 and for storing it, is configuration dependent. Therefore, if you
1324 say Y here, you must know the proper physical address where to
1325 store the kernel image depending on your own flash memory usage.
1327 Also note that the make target becomes "make xipImage" rather than
1328 "make zImage" or "make Image". The final kernel binary to put in
1329 ROM memory will be arch/arm/boot/xipImage.
1333 config XIP_PHYS_ADDR
1334 hex "XIP Kernel Physical Location"
1335 depends on XIP_KERNEL
1336 default "0x00080000"
1338 This is the physical address in your flash memory the kernel will
1339 be linked for and stored to. This address is dependent on your
1343 bool "Kexec system call (EXPERIMENTAL)"
1344 depends on EXPERIMENTAL
1346 kexec is a system call that implements the ability to shutdown your
1347 current kernel, and to start another kernel. It is like a reboot
1348 but it is independent of the system firmware. And like a reboot
1349 you can start any kernel with it, not just Linux.
1351 It is an ongoing process to be certain the hardware in a machine
1352 is properly shutdown, so do not be surprised if this code does not
1353 initially work for you. It may help to enable device hotplugging
1357 bool "Export atags in procfs"
1361 Should the atags used to boot the kernel be exported in an "atags"
1362 file in procfs. Useful with kexec.
1366 menu "CPU Power Management"
1370 source "drivers/cpufreq/Kconfig"
1372 config CPU_FREQ_SA1100
1375 config CPU_FREQ_SA1110
1378 config CPU_FREQ_INTEGRATOR
1379 tristate "CPUfreq driver for ARM Integrator CPUs"
1380 depends on ARCH_INTEGRATOR && CPU_FREQ
1383 This enables the CPUfreq driver for ARM Integrator CPUs.
1385 For details, take a look at <file:Documentation/cpu-freq>.
1391 depends on CPU_FREQ && ARCH_PXA && PXA25x
1393 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1395 config CPU_FREQ_S3C64XX
1396 bool "CPUfreq support for Samsung S3C64XX CPUs"
1397 depends on CPU_FREQ && CPU_S3C6410
1402 Internal configuration node for common cpufreq on Samsung SoC
1404 config CPU_FREQ_S3C24XX
1405 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1406 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1409 This enables the CPUfreq driver for the Samsung S3C24XX family
1412 For details, take a look at <file:Documentation/cpu-freq>.
1416 config CPU_FREQ_S3C24XX_PLL
1417 bool "Support CPUfreq changing of PLL frequency"
1418 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1420 Compile in support for changing the PLL frequency from the
1421 S3C24XX series CPUfreq driver. The PLL takes time to settle
1422 after a frequency change, so by default it is not enabled.
1424 This also means that the PLL tables for the selected CPU(s) will
1425 be built which may increase the size of the kernel image.
1427 config CPU_FREQ_S3C24XX_DEBUG
1428 bool "Debug CPUfreq Samsung driver core"
1429 depends on CPU_FREQ_S3C24XX
1431 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1433 config CPU_FREQ_S3C24XX_IODEBUG
1434 bool "Debug CPUfreq Samsung driver IO timing"
1435 depends on CPU_FREQ_S3C24XX
1437 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1439 config CPU_FREQ_S3C24XX_DEBUGFS
1440 bool "Export debugfs for CPUFreq"
1441 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1443 Export status information via debugfs.
1447 source "drivers/cpuidle/Kconfig"
1451 menu "Floating point emulation"
1453 comment "At least one emulation must be selected"
1456 bool "NWFPE math emulation"
1457 depends on !AEABI || OABI_COMPAT
1459 Say Y to include the NWFPE floating point emulator in the kernel.
1460 This is necessary to run most binaries. Linux does not currently
1461 support floating point hardware so you need to say Y here even if
1462 your machine has an FPA or floating point co-processor podule.
1464 You may say N here if you are going to load the Acorn FPEmulator
1465 early in the bootup.
1468 bool "Support extended precision"
1469 depends on FPE_NWFPE
1471 Say Y to include 80-bit support in the kernel floating-point
1472 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1473 Note that gcc does not generate 80-bit operations by default,
1474 so in most cases this option only enlarges the size of the
1475 floating point emulator without any good reason.
1477 You almost surely want to say N here.
1480 bool "FastFPE math emulation (EXPERIMENTAL)"
1481 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1483 Say Y here to include the FAST floating point emulator in the kernel.
1484 This is an experimental much faster emulator which now also has full
1485 precision for the mantissa. It does not support any exceptions.
1486 It is very simple, and approximately 3-6 times faster than NWFPE.
1488 It should be sufficient for most programs. It may be not suitable
1489 for scientific calculations, but you have to check this for yourself.
1490 If you do not feel you need a faster FP emulation you should better
1494 bool "VFP-format floating point maths"
1495 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1497 Say Y to include VFP support code in the kernel. This is needed
1498 if your hardware includes a VFP unit.
1500 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1501 release notes and additional status information.
1503 Say N if your target does not have VFP hardware.
1511 bool "Advanced SIMD (NEON) Extension support"
1512 depends on VFPv3 && CPU_V7
1514 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1519 menu "Userspace binary formats"
1521 source "fs/Kconfig.binfmt"
1524 tristate "RISC OS personality"
1527 Say Y here to include the kernel code necessary if you want to run
1528 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1529 experimental; if this sounds frightening, say N and sleep in peace.
1530 You can also say M here to compile this support as a module (which
1531 will be called arthur).
1535 menu "Power management options"
1537 source "kernel/power/Kconfig"
1539 config ARCH_SUSPEND_POSSIBLE
1544 source "net/Kconfig"
1546 source "drivers/Kconfig"
1550 source "arch/arm/Kconfig.debug"
1552 source "security/Kconfig"
1554 source "crypto/Kconfig"
1556 source "lib/Kconfig"