2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
14 select SYS_SUPPORTS_APM_EMULATION
15 select GENERIC_ATOMIC64 if (!CPU_32v6K)
18 select HAVE_KPROBES if (!XIP_KERNEL)
19 select HAVE_KRETPROBES if (HAVE_KPROBES)
20 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
21 select HAVE_GENERIC_DMA_COHERENT
22 select HAVE_KERNEL_GZIP
23 select HAVE_KERNEL_LZO
24 select HAVE_PERF_EVENTS
25 select PERF_USE_VMALLOC
27 The ARM series is a line of low-power-consumption RISC chip designs
28 licensed by ARM Ltd and targeted at embedded applications and
29 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
30 manufactured, but legacy ARM-based PC hardware remains popular in
31 Europe. There is an ARM Linux project with a web page at
32 <http://www.arm.linux.org.uk/>.
37 config SYS_SUPPORTS_APM_EMULATION
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
67 The Extended Industry Standard Architecture (EISA) bus was
68 developed as an open alternative to the IBM MicroChannel bus.
70 The EISA bus provided some of the features of the IBM MicroChannel
71 bus while maintaining backward compatibility with cards made for
72 the older ISA bus. The EISA bus saw limited use between 1988 and
73 1995 when it was made obsolete by the PCI bus.
75 Say Y here if you are building a kernel for an EISA-based machine.
85 MicroChannel Architecture is found in some IBM PS/2 machines and
86 laptops. It is a bus system similar to PCI or ISA. See
87 <file:Documentation/mca.txt> (and especially the web page given
88 there) before attempting to build an MCA bus kernel.
90 config GENERIC_HARDIRQS
94 config STACKTRACE_SUPPORT
98 config HAVE_LATENCYTOP_SUPPORT
103 config LOCKDEP_SUPPORT
107 config TRACE_IRQFLAGS_SUPPORT
111 config HARDIRQS_SW_RESEND
115 config GENERIC_IRQ_PROBE
119 config GENERIC_LOCKBREAK
122 depends on SMP && PREEMPT
124 config RWSEM_GENERIC_SPINLOCK
128 config RWSEM_XCHGADD_ALGORITHM
131 config ARCH_HAS_ILOG2_U32
134 config ARCH_HAS_ILOG2_U64
137 config ARCH_HAS_CPUFREQ
140 Internal node to signify that the ARCH has CPUFREQ support
141 and that the relevant menu configurations are displayed for
144 config GENERIC_HWEIGHT
148 config GENERIC_CALIBRATE_DELAY
152 config ARCH_MAY_HAVE_PC_FDC
158 config GENERIC_ISA_DMA
167 config GENERIC_HARDIRQS_NO__DO_IRQ
170 config ARM_L1_CACHE_SHIFT_6
173 Setting ARM L1 cache line size to 64 Bytes.
177 config OPROFILE_ARMV6
179 depends on CPU_V6 && !SMP
180 select OPROFILE_ARM11_CORE
182 config OPROFILE_MPCORE
184 depends on CPU_V6 && SMP
185 select OPROFILE_ARM11_CORE
187 config OPROFILE_ARM11_CORE
190 config OPROFILE_ARMV7
192 depends on CPU_V7 && !SMP
199 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
200 default DRAM_BASE if REMAP_VECTORS_TO_RAM
203 The base address of exception vectors.
205 source "init/Kconfig"
207 source "kernel/Kconfig.freezer"
212 bool "MMU-based Paged Memory Management Support"
215 Select if you want MMU-based virtualised addressing space
216 support by paged memory management. If unsure, say 'Y'.
219 prompt "ARM system type"
220 default ARCH_VERSATILE
223 bool "Agilent AAEC-2000 based"
228 This enables support for systems based on the Agilent AAEC-2000
230 config ARCH_INTEGRATOR
231 bool "ARM Ltd. Integrator family"
233 select ARCH_HAS_CPUFREQ
238 Support for ARM's Integrator platform.
241 bool "ARM Ltd. RealView family"
247 select GENERIC_CLOCKEVENTS
248 select ARCH_WANT_OPTIONAL_GPIOLIB
250 This enables support for ARM Ltd RealView boards.
252 config ARCH_VERSATILE
253 bool "ARM Ltd. Versatile family"
260 select GENERIC_CLOCKEVENTS
261 select ARCH_WANT_OPTIONAL_GPIOLIB
263 This enables support for ARM Ltd Versatile board.
268 select ARCH_REQUIRE_GPIOLIB
271 This enables support for systems based on the Atmel AT91RM9200,
272 AT91SAM9 and AT91CAP9 processors.
275 bool "Cirrus Logic CLPS711x/EP721x-based"
278 Support for Cirrus Logic 711x/721x based boards.
281 bool "Cortina Systems Gemini"
284 select ARCH_REQUIRE_GPIOLIB
286 Support for the Cortina Systems Gemini family SoCs
294 This is an evaluation board for the StrongARM processor available
295 from Digital. It has limited hardware on-board, including an
296 Ethernet interface, two PCMCIA sockets, two serial ports and a
307 select ARCH_REQUIRE_GPIOLIB
308 select ARCH_HAS_HOLES_MEMORYMODEL
310 This enables support for the Cirrus EP93xx series of CPUs.
312 config ARCH_FOOTBRIDGE
317 Support for systems based on the DC21285 companion chip
318 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
321 bool "Freescale MXC/iMX-based"
323 select GENERIC_CLOCKEVENTS
324 select ARCH_REQUIRE_GPIOLIB
328 Support for Freescale MXC/iMX-based family of processors
331 bool "Freescale STMP3xxx"
335 select ARCH_REQUIRE_GPIOLIB
337 select GENERIC_CLOCKEVENTS
339 select USB_ARCH_HAS_EHCI
341 Support for systems based on the Freescale 3xxx CPUs.
344 bool "Hilscher NetX based"
347 select GENERIC_CLOCKEVENTS
350 This enables support for systems based on the Hilscher NetX Soc
353 bool "Hynix HMS720x-based"
357 This enables support for systems based on the Hynix HMS720x
360 bool "STMicroelectronics Nomadik"
367 select GENERIC_CLOCKEVENTS
369 select ARCH_REQUIRE_GPIOLIB
371 Support for the Nomadik platform by ST-Ericsson
379 select ARCH_SUPPORTS_MSI
382 Support for Intel's IOP13XX (XScale) family of processors.
391 select ARCH_REQUIRE_GPIOLIB
393 Support for Intel's 80219 and IOP32X (XScale) family of
403 select ARCH_REQUIRE_GPIOLIB
405 Support for Intel's IOP33X (XScale) family of processors.
413 Support for Intel's IXP23xx (XScale) family of processors.
416 bool "IXP2400/2800-based"
421 Support for Intel's IXP2400/2800 (XScale) family of processors.
429 select GENERIC_CLOCKEVENTS
430 select DMABOUNCE if PCI
432 Support for Intel's IXP4XX (XScale) family of processors.
439 Say Y here if you intend to run this kernel on a LinkUp Systems
440 L7200 Software Development Board which uses an ARM720T processor.
441 Information on this board can be obtained at:
443 <http://www.linkupsys.com/>
445 If you have any questions or comments about the Linux kernel port
446 to this board, send e-mail to <sjhill@cotw.com>.
452 select ARCH_REQUIRE_GPIOLIB
454 select GENERIC_CLOCKEVENTS
457 Support for the Marvell Dove SoC 88AP510
460 bool "Marvell Kirkwood"
464 select ARCH_REQUIRE_GPIOLIB
466 select GENERIC_CLOCKEVENTS
469 Support for the following Marvell Kirkwood series SoCs:
470 88F6180, 88F6192 and 88F6281.
473 bool "Marvell Loki (88RC8480)"
476 select GENERIC_CLOCKEVENTS
479 Support for the Marvell Loki (88RC8480) SoC.
482 bool "Marvell MV78xx0"
486 select ARCH_REQUIRE_GPIOLIB
488 select GENERIC_CLOCKEVENTS
491 Support for the following Marvell MV78xx0 series SoCs:
500 select ARCH_REQUIRE_GPIOLIB
502 select GENERIC_CLOCKEVENTS
505 Support for the following Marvell Orion 5x series SoCs:
506 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
507 Orion-2 (5281), Orion-1-90 (6183).
510 bool "Marvell PXA168/910/MMP2"
513 select ARCH_REQUIRE_GPIOLIB
517 select GENERIC_CLOCKEVENTS
521 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
524 bool "Micrel/Kendin KS8695"
527 select ARCH_REQUIRE_GPIOLIB
529 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
530 System-on-Chip devices.
533 bool "NetSilicon NS9xxx"
537 select GENERIC_CLOCKEVENTS
540 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
543 <http://www.digi.com/products/microprocessors/index.jsp>
546 bool "Nuvoton W90X900 CPU"
548 select ARCH_REQUIRE_GPIOLIB
553 select GENERIC_CLOCKEVENTS
555 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
556 At present, the w90x900 has been renamed nuc900, regarding
557 the ARM series product line, you can login the following
558 link address to know more.
560 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
561 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
564 bool "Nuvoton NUC93X CPU"
569 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
570 low-power and high performance MPEG-4/JPEG multimedia controller chip.
573 bool "Philips Nexperia PNX4008 Mobile"
578 This enables support for Philips PNX4008 mobile platform.
581 bool "PXA2xx/PXA3xx-based"
584 select ARCH_HAS_CPUFREQ
588 select ARCH_REQUIRE_GPIOLIB
590 select GENERIC_CLOCKEVENTS
594 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
600 select GENERIC_CLOCKEVENTS
602 Support for Qualcomm MSM7K based systems. This runs on the ARM11
603 apps processor of the MSM7K and depends on a shared memory
604 interface to the ARM9 modem processor which runs the baseband stack
605 and controls some vital subsystems (clock and power control, etc).
608 bool "Renesas SH-Mobile"
610 Support for Renesas's SH-Mobile ARM platforms
617 select ARCH_MAY_HAVE_PC_FDC
618 select HAVE_PATA_PLATFORM
621 select ARCH_SPARSEMEM_ENABLE
623 On the Acorn Risc-PC, Linux can support the internal IDE disk and
624 CD-ROM interface, serial and parallel port, and the floppy drive.
630 select ARCH_SPARSEMEM_ENABLE
632 select ARCH_HAS_CPUFREQ
636 select GENERIC_CLOCKEVENTS
639 select ARCH_REQUIRE_GPIOLIB
641 Support for StrongARM 11x0 based boards.
644 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
646 select ARCH_HAS_CPUFREQ
649 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
650 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
651 the Samsung SMDK2410 development board (and derivatives).
654 bool "Samsung S3C64XX"
661 select ARCH_HAS_CPUFREQ
662 select ARCH_REQUIRE_GPIOLIB
663 select SAMSUNG_CLKSRC
664 select SAMSUNG_IRQ_VIC_TIMER
665 select SAMSUNG_IRQ_UART
666 select S3C_GPIO_TRACK
667 select S3C_GPIO_PULL_UPDOWN
668 select S3C_GPIO_CFG_S3C24XX
669 select S3C_GPIO_CFG_S3C64XX
671 select USB_ARCH_HAS_OHCI
672 select SAMSUNG_GPIOLIB_4BIT
674 Samsung S3C64XX series based systems
677 bool "Samsung S5P6440"
682 Samsung S5P6440 CPU based systems
685 bool "Samsung S5P6442"
690 Samsung S5P6442 CPU based systems
693 bool "Samsung S5PC1XX"
697 select ARM_L1_CACHE_SHIFT_6
699 Samsung S5PC1XX series based systems
702 bool "Samsung S5PV210/S5PC110"
706 select ARM_L1_CACHE_SHIFT_6
708 Samsung S5PV210/S5PC110 series based systems
718 Support for the StrongARM based Digital DNARD machine, also known
719 as "Shark" (<http://www.shark-linux.de/shark.html>).
724 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
725 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
727 Say Y here for systems based on one of the Sharp LH7A40X
728 System on a Chip processors. These CPUs include an ARM922T
729 core with a wide array of integrated devices for
730 hand-held and low-power applications.
733 bool "ST-Ericsson U300 Series"
740 select GENERIC_CLOCKEVENTS
745 Support for ST-Ericsson U300 series mobile platforms.
751 select GENERIC_CLOCKEVENTS
753 select ARCH_REQUIRE_GPIOLIB
758 select GENERIC_ALLOCATOR
759 select ARCH_HAS_HOLES_MEMORYMODEL
761 Support for TI's DaVinci platform.
767 select ARCH_REQUIRE_GPIOLIB
768 select ARCH_HAS_CPUFREQ
770 select GENERIC_CLOCKEVENTS
771 select ARCH_HAS_HOLES_MEMORYMODEL
773 Support for TI's OMAP platform (OMAP1 and OMAP2).
776 bool "Broadcom BCMRING"
782 select GENERIC_CLOCKEVENTS
783 select ARCH_WANT_OPTIONAL_GPIOLIB
785 Support for Broadcom's BCMRing platform.
788 bool "ST-Ericsson U8500 Series"
792 select GENERIC_CLOCKEVENTS
795 Support for ST-Ericsson's Ux500 architecture
799 source "arch/arm/mach-aaec2000/Kconfig"
801 source "arch/arm/mach-at91/Kconfig"
803 source "arch/arm/mach-bcmring/Kconfig"
805 source "arch/arm/mach-clps711x/Kconfig"
807 source "arch/arm/mach-davinci/Kconfig"
809 source "arch/arm/mach-dove/Kconfig"
811 source "arch/arm/mach-ep93xx/Kconfig"
813 source "arch/arm/mach-footbridge/Kconfig"
815 source "arch/arm/mach-gemini/Kconfig"
817 source "arch/arm/mach-h720x/Kconfig"
819 source "arch/arm/mach-integrator/Kconfig"
821 source "arch/arm/mach-iop32x/Kconfig"
823 source "arch/arm/mach-iop33x/Kconfig"
825 source "arch/arm/mach-iop13xx/Kconfig"
827 source "arch/arm/mach-ixp4xx/Kconfig"
829 source "arch/arm/mach-ixp2000/Kconfig"
831 source "arch/arm/mach-ixp23xx/Kconfig"
833 source "arch/arm/mach-kirkwood/Kconfig"
835 source "arch/arm/mach-ks8695/Kconfig"
837 source "arch/arm/mach-lh7a40x/Kconfig"
839 source "arch/arm/mach-loki/Kconfig"
841 source "arch/arm/mach-msm/Kconfig"
843 source "arch/arm/mach-mv78xx0/Kconfig"
845 source "arch/arm/plat-mxc/Kconfig"
847 source "arch/arm/mach-netx/Kconfig"
849 source "arch/arm/mach-nomadik/Kconfig"
850 source "arch/arm/plat-nomadik/Kconfig"
852 source "arch/arm/mach-ns9xxx/Kconfig"
854 source "arch/arm/mach-nuc93x/Kconfig"
856 source "arch/arm/plat-omap/Kconfig"
858 source "arch/arm/mach-omap1/Kconfig"
860 source "arch/arm/mach-omap2/Kconfig"
862 source "arch/arm/mach-orion5x/Kconfig"
864 source "arch/arm/mach-pxa/Kconfig"
865 source "arch/arm/plat-pxa/Kconfig"
867 source "arch/arm/mach-mmp/Kconfig"
869 source "arch/arm/mach-realview/Kconfig"
871 source "arch/arm/mach-sa1100/Kconfig"
873 source "arch/arm/plat-samsung/Kconfig"
874 source "arch/arm/plat-s3c24xx/Kconfig"
875 source "arch/arm/plat-s5p/Kconfig"
876 source "arch/arm/plat-s5pc1xx/Kconfig"
879 source "arch/arm/mach-s3c2400/Kconfig"
880 source "arch/arm/mach-s3c2410/Kconfig"
881 source "arch/arm/mach-s3c2412/Kconfig"
882 source "arch/arm/mach-s3c2440/Kconfig"
883 source "arch/arm/mach-s3c2443/Kconfig"
887 source "arch/arm/mach-s3c64xx/Kconfig"
890 source "arch/arm/mach-s5p6440/Kconfig"
892 source "arch/arm/mach-s5p6442/Kconfig"
895 source "arch/arm/mach-s5pc100/Kconfig"
898 source "arch/arm/mach-s5pv210/Kconfig"
900 source "arch/arm/mach-shmobile/Kconfig"
902 source "arch/arm/plat-stmp3xxx/Kconfig"
904 source "arch/arm/mach-u300/Kconfig"
906 source "arch/arm/mach-ux500/Kconfig"
908 source "arch/arm/mach-versatile/Kconfig"
910 source "arch/arm/mach-w90x900/Kconfig"
912 # Definitions to make life easier
918 select GENERIC_CLOCKEVENTS
927 source arch/arm/mm/Kconfig
930 bool "Enable iWMMXt support"
931 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
932 default y if PXA27x || PXA3xx || ARCH_MMP
934 Enable support for iWMMXt context switching at run time if
935 running on a CPU that supports it.
937 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
940 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
944 depends on CPU_V6 || CPU_V7 || XSCALE_PMU
949 source "arch/arm/Kconfig-nommu"
952 config ARM_ERRATA_411920
953 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
954 depends on CPU_V6 && !SMP
956 Invalidation of the Instruction Cache operation can
957 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
958 It does not affect the MPCore. This option enables the ARM Ltd.
959 recommended workaround.
961 config ARM_ERRATA_430973
962 bool "ARM errata: Stale prediction on replaced interworking branch"
965 This option enables the workaround for the 430973 Cortex-A8
966 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
967 interworking branch is replaced with another code sequence at the
968 same virtual address, whether due to self-modifying code or virtual
969 to physical address re-mapping, Cortex-A8 does not recover from the
970 stale interworking branch prediction. This results in Cortex-A8
971 executing the new code sequence in the incorrect ARM or Thumb state.
972 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
973 and also flushes the branch target cache at every context switch.
974 Note that setting specific bits in the ACTLR register may not be
975 available in non-secure mode.
977 config ARM_ERRATA_458693
978 bool "ARM errata: Processor deadlock when a false hazard is created"
981 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
982 erratum. For very specific sequences of memory operations, it is
983 possible for a hazard condition intended for a cache line to instead
984 be incorrectly associated with a different cache line. This false
985 hazard might then cause a processor deadlock. The workaround enables
986 the L1 caching of the NEON accesses and disables the PLD instruction
987 in the ACTLR register. Note that setting specific bits in the ACTLR
988 register may not be available in non-secure mode.
990 config ARM_ERRATA_460075
991 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
994 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
995 erratum. Any asynchronous access to the L2 cache may encounter a
996 situation in which recent store transactions to the L2 cache are lost
997 and overwritten with stale memory contents from external memory. The
998 workaround disables the write-allocate mode for the L2 cache via the
999 ACTLR register. Note that setting specific bits in the ACTLR register
1000 may not be available in non-secure mode.
1002 config PL310_ERRATA_588369
1003 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1004 depends on CACHE_L2X0 && ARCH_OMAP4
1006 The PL310 L2 cache controller implements three types of Clean &
1007 Invalidate maintenance operations: by Physical Address
1008 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1009 They are architecturally defined to behave as the execution of a
1010 clean operation followed immediately by an invalidate operation,
1011 both performing to the same memory location. This functionality
1012 is not correctly implemented in PL310 as clean lines are not
1013 invalidated as a result of these operations. Note that this errata
1014 uses Texas Instrument's secure monitor api.
1017 source "arch/arm/common/Kconfig"
1019 config FORCE_MAX_ZONEORDER
1032 Find out whether you have ISA slots on your motherboard. ISA is the
1033 name of a bus system, i.e. the way the CPU talks to the other stuff
1034 inside your box. Other bus systems are PCI, EISA, MicroChannel
1035 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1036 newer boards don't support it. If you have ISA, say Y, otherwise N.
1038 # Select ISA DMA controller support
1043 # Select ISA DMA interface
1048 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1050 Find out whether you have a PCI motherboard. PCI is the name of a
1051 bus system, i.e. the way the CPU talks to the other stuff inside
1052 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1053 VESA. If you have PCI, say Y, otherwise N.
1058 # Select the host bridge type
1059 config PCI_HOST_VIA82C505
1061 depends on PCI && ARCH_SHARK
1064 config PCI_HOST_ITE8152
1066 depends on PCI && MACH_ARMCORE
1070 source "drivers/pci/Kconfig"
1072 source "drivers/pcmcia/Kconfig"
1076 menu "Kernel Features"
1078 source "kernel/time/Kconfig"
1081 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1082 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1083 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1084 depends on GENERIC_CLOCKEVENTS
1085 select USE_GENERIC_SMP_HELPERS
1086 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1088 This enables support for systems with more than one CPU. If you have
1089 a system with only one CPU, like most personal computers, say N. If
1090 you have a system with more than one CPU, say Y.
1092 If you say N here, the kernel will run on single and multiprocessor
1093 machines, but will use only one CPU of a multiprocessor machine. If
1094 you say Y here, the kernel will run on many, but not all, single
1095 processor machines. On a single processor machine, the kernel will
1096 run faster if you say N here.
1098 See also <file:Documentation/i386/IO-APIC.txt>,
1099 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1100 <http://www.linuxdoc.org/docs.html#howto>.
1102 If you don't know what to do here, say N.
1108 This option enables support for the ARM system coherency unit
1114 This options enables support for the ARM timer and watchdog unit
1117 prompt "Memory split"
1120 Select the desired split between kernel and user memory.
1122 If you are not absolutely sure what you are doing, leave this
1126 bool "3G/1G user/kernel split"
1128 bool "2G/2G user/kernel split"
1130 bool "1G/3G user/kernel split"
1135 default 0x40000000 if VMSPLIT_1G
1136 default 0x80000000 if VMSPLIT_2G
1140 int "Maximum number of CPUs (2-32)"
1146 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1147 depends on SMP && HOTPLUG && EXPERIMENTAL
1149 Say Y here to experiment with turning CPUs off and on. CPUs
1150 can be controlled through /sys/devices/system/cpu.
1153 bool "Use local timer interrupts"
1154 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1155 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1157 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1159 Enable support for local timers on SMP platforms, rather then the
1160 legacy IPI broadcast method. Local timers allows the system
1161 accounting to be spread across the timer interval, preventing a
1162 "thundering herd" at every timer tick.
1164 source kernel/Kconfig.preempt
1168 default 128 if ARCH_L7200
1169 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1170 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1171 default AT91_TIMER_HZ if ARCH_AT91
1174 config THUMB2_KERNEL
1175 bool "Compile the kernel in Thumb-2 mode"
1176 depends on CPU_V7 && EXPERIMENTAL
1178 select ARM_ASM_UNIFIED
1180 By enabling this option, the kernel will be compiled in
1181 Thumb-2 mode. A compiler/assembler that understand the unified
1182 ARM-Thumb syntax is needed.
1186 config ARM_ASM_UNIFIED
1190 bool "Use the ARM EABI to compile the kernel"
1192 This option allows for the kernel to be compiled using the latest
1193 ARM ABI (aka EABI). This is only useful if you are using a user
1194 space environment that is also compiled with EABI.
1196 Since there are major incompatibilities between the legacy ABI and
1197 EABI, especially with regard to structure member alignment, this
1198 option also changes the kernel syscall calling convention to
1199 disambiguate both ABIs and allow for backward compatibility support
1200 (selected with CONFIG_OABI_COMPAT).
1202 To use this you need GCC version 4.0.0 or later.
1205 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1206 depends on AEABI && EXPERIMENTAL
1209 This option preserves the old syscall interface along with the
1210 new (ARM EABI) one. It also provides a compatibility layer to
1211 intercept syscalls that have structure arguments which layout
1212 in memory differs between the legacy ABI and the new ARM EABI
1213 (only for non "thumb" binaries). This option adds a tiny
1214 overhead to all syscalls and produces a slightly larger kernel.
1215 If you know you'll be using only pure EABI user space then you
1216 can say N here. If this option is not selected and you attempt
1217 to execute a legacy ABI binary then the result will be
1218 UNPREDICTABLE (in fact it can be predicted that it won't work
1219 at all). If in doubt say Y.
1221 config ARCH_HAS_HOLES_MEMORYMODEL
1224 # Discontigmem is deprecated
1225 config ARCH_DISCONTIGMEM_ENABLE
1228 config ARCH_SPARSEMEM_ENABLE
1231 config ARCH_SPARSEMEM_DEFAULT
1232 def_bool ARCH_SPARSEMEM_ENABLE
1234 config ARCH_SELECT_MEMORY_MODEL
1235 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1239 default "4" if ARCH_LH7A40X
1241 depends on NEED_MULTIPLE_NODES
1244 bool "High Memory Support (EXPERIMENTAL)"
1245 depends on MMU && EXPERIMENTAL
1247 The address space of ARM processors is only 4 Gigabytes large
1248 and it has to accommodate user address space, kernel address
1249 space as well as some memory mapped IO. That means that, if you
1250 have a large amount of physical memory and/or IO, not all of the
1251 memory can be "permanently mapped" by the kernel. The physical
1252 memory that is not permanently mapped is called "high memory".
1254 Depending on the selected kernel/user memory split, minimum
1255 vmalloc space and actual amount of RAM, you may not need this
1256 option which should result in a slightly faster kernel.
1261 bool "Allocate 2nd-level pagetables from highmem"
1263 depends on !OUTER_CACHE
1265 config HW_PERF_EVENTS
1266 bool "Enable hardware performance counter support for perf events"
1267 depends on PERF_EVENTS && CPU_HAS_PMU && (CPU_V6 || CPU_V7)
1270 Enable hardware performance counter support for perf events. If
1271 disabled, perf events will use software events only.
1276 bool "Timer and CPU usage LEDs"
1277 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1278 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1279 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1280 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1281 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1282 ARCH_AT91 || ARCH_DAVINCI || \
1283 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1285 If you say Y here, the LEDs on your machine will be used
1286 to provide useful information about your current system status.
1288 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1289 be able to select which LEDs are active using the options below. If
1290 you are compiling a kernel for the EBSA-110 or the LART however, the
1291 red LED will simply flash regularly to indicate that the system is
1292 still functional. It is safe to say Y here if you have a CATS
1293 system, but the driver will do nothing.
1296 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1297 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1298 || MACH_OMAP_PERSEUS2
1300 depends on !GENERIC_CLOCKEVENTS
1301 default y if ARCH_EBSA110
1303 If you say Y here, one of the system LEDs (the green one on the
1304 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1305 will flash regularly to indicate that the system is still
1306 operational. This is mainly useful to kernel hackers who are
1307 debugging unstable kernels.
1309 The LART uses the same LED for both Timer LED and CPU usage LED
1310 functions. You may choose to use both, but the Timer LED function
1311 will overrule the CPU usage LED.
1314 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1316 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1317 || MACH_OMAP_PERSEUS2
1320 If you say Y here, the red LED will be used to give a good real
1321 time indication of CPU usage, by lighting whenever the idle task
1322 is not currently executing.
1324 The LART uses the same LED for both Timer LED and CPU usage LED
1325 functions. You may choose to use both, but the Timer LED function
1326 will overrule the CPU usage LED.
1328 config ALIGNMENT_TRAP
1330 depends on CPU_CP15_MMU
1331 default y if !ARCH_EBSA110
1332 select HAVE_PROC_CPU if PROC_FS
1334 ARM processors cannot fetch/store information which is not
1335 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1336 address divisible by 4. On 32-bit ARM processors, these non-aligned
1337 fetch/store instructions will be emulated in software if you say
1338 here, which has a severe performance impact. This is necessary for
1339 correct operation of some network protocols. With an IP-only
1340 configuration it is safe to say N, otherwise say Y.
1342 config UACCESS_WITH_MEMCPY
1343 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1344 depends on MMU && EXPERIMENTAL
1345 default y if CPU_FEROCEON
1347 Implement faster copy_to_user and clear_user methods for CPU
1348 cores where a 8-word STM instruction give significantly higher
1349 memory write throughput than a sequence of individual 32bit stores.
1351 A possible side effect is a slight increase in scheduling latency
1352 between threads sharing the same address space if they invoke
1353 such copy operations with large buffers.
1355 However, if the CPU data cache is using a write-allocate mode,
1356 this option is unlikely to provide any performance gain.
1362 # Compressed boot loader in ROM. Yes, we really want to ask about
1363 # TEXT and BSS so we preserve their values in the config files.
1364 config ZBOOT_ROM_TEXT
1365 hex "Compressed ROM boot loader base address"
1368 The physical address at which the ROM-able zImage is to be
1369 placed in the target. Platforms which normally make use of
1370 ROM-able zImage formats normally set this to a suitable
1371 value in their defconfig file.
1373 If ZBOOT_ROM is not enabled, this has no effect.
1375 config ZBOOT_ROM_BSS
1376 hex "Compressed ROM boot loader BSS address"
1379 The base address of an area of read/write memory in the target
1380 for the ROM-able zImage which must be available while the
1381 decompressor is running. It must be large enough to hold the
1382 entire decompressed kernel plus an additional 128 KiB.
1383 Platforms which normally make use of ROM-able zImage formats
1384 normally set this to a suitable value in their defconfig file.
1386 If ZBOOT_ROM is not enabled, this has no effect.
1389 bool "Compressed boot loader in ROM/flash"
1390 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1392 Say Y here if you intend to execute your compressed kernel image
1393 (zImage) directly from ROM or flash. If unsure, say N.
1396 string "Default kernel command string"
1399 On some architectures (EBSA110 and CATS), there is currently no way
1400 for the boot loader to pass arguments to the kernel. For these
1401 architectures, you should supply some command-line options at build
1402 time by entering them here. As a minimum, you should specify the
1403 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1406 bool "Kernel Execute-In-Place from ROM"
1407 depends on !ZBOOT_ROM
1409 Execute-In-Place allows the kernel to run from non-volatile storage
1410 directly addressable by the CPU, such as NOR flash. This saves RAM
1411 space since the text section of the kernel is not loaded from flash
1412 to RAM. Read-write sections, such as the data section and stack,
1413 are still copied to RAM. The XIP kernel is not compressed since
1414 it has to run directly from flash, so it will take more space to
1415 store it. The flash address used to link the kernel object files,
1416 and for storing it, is configuration dependent. Therefore, if you
1417 say Y here, you must know the proper physical address where to
1418 store the kernel image depending on your own flash memory usage.
1420 Also note that the make target becomes "make xipImage" rather than
1421 "make zImage" or "make Image". The final kernel binary to put in
1422 ROM memory will be arch/arm/boot/xipImage.
1426 config XIP_PHYS_ADDR
1427 hex "XIP Kernel Physical Location"
1428 depends on XIP_KERNEL
1429 default "0x00080000"
1431 This is the physical address in your flash memory the kernel will
1432 be linked for and stored to. This address is dependent on your
1436 bool "Kexec system call (EXPERIMENTAL)"
1437 depends on EXPERIMENTAL
1439 kexec is a system call that implements the ability to shutdown your
1440 current kernel, and to start another kernel. It is like a reboot
1441 but it is independent of the system firmware. And like a reboot
1442 you can start any kernel with it, not just Linux.
1444 It is an ongoing process to be certain the hardware in a machine
1445 is properly shutdown, so do not be surprised if this code does not
1446 initially work for you. It may help to enable device hotplugging
1450 bool "Export atags in procfs"
1454 Should the atags used to boot the kernel be exported in an "atags"
1455 file in procfs. Useful with kexec.
1459 menu "CPU Power Management"
1463 source "drivers/cpufreq/Kconfig"
1465 config CPU_FREQ_SA1100
1468 config CPU_FREQ_SA1110
1471 config CPU_FREQ_INTEGRATOR
1472 tristate "CPUfreq driver for ARM Integrator CPUs"
1473 depends on ARCH_INTEGRATOR && CPU_FREQ
1476 This enables the CPUfreq driver for ARM Integrator CPUs.
1478 For details, take a look at <file:Documentation/cpu-freq>.
1484 depends on CPU_FREQ && ARCH_PXA && PXA25x
1486 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1488 config CPU_FREQ_S3C64XX
1489 bool "CPUfreq support for Samsung S3C64XX CPUs"
1490 depends on CPU_FREQ && CPU_S3C6410
1495 Internal configuration node for common cpufreq on Samsung SoC
1497 config CPU_FREQ_S3C24XX
1498 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1499 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1502 This enables the CPUfreq driver for the Samsung S3C24XX family
1505 For details, take a look at <file:Documentation/cpu-freq>.
1509 config CPU_FREQ_S3C24XX_PLL
1510 bool "Support CPUfreq changing of PLL frequency"
1511 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1513 Compile in support for changing the PLL frequency from the
1514 S3C24XX series CPUfreq driver. The PLL takes time to settle
1515 after a frequency change, so by default it is not enabled.
1517 This also means that the PLL tables for the selected CPU(s) will
1518 be built which may increase the size of the kernel image.
1520 config CPU_FREQ_S3C24XX_DEBUG
1521 bool "Debug CPUfreq Samsung driver core"
1522 depends on CPU_FREQ_S3C24XX
1524 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1526 config CPU_FREQ_S3C24XX_IODEBUG
1527 bool "Debug CPUfreq Samsung driver IO timing"
1528 depends on CPU_FREQ_S3C24XX
1530 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1532 config CPU_FREQ_S3C24XX_DEBUGFS
1533 bool "Export debugfs for CPUFreq"
1534 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1536 Export status information via debugfs.
1540 source "drivers/cpuidle/Kconfig"
1544 menu "Floating point emulation"
1546 comment "At least one emulation must be selected"
1549 bool "NWFPE math emulation"
1550 depends on !AEABI || OABI_COMPAT
1552 Say Y to include the NWFPE floating point emulator in the kernel.
1553 This is necessary to run most binaries. Linux does not currently
1554 support floating point hardware so you need to say Y here even if
1555 your machine has an FPA or floating point co-processor podule.
1557 You may say N here if you are going to load the Acorn FPEmulator
1558 early in the bootup.
1561 bool "Support extended precision"
1562 depends on FPE_NWFPE
1564 Say Y to include 80-bit support in the kernel floating-point
1565 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1566 Note that gcc does not generate 80-bit operations by default,
1567 so in most cases this option only enlarges the size of the
1568 floating point emulator without any good reason.
1570 You almost surely want to say N here.
1573 bool "FastFPE math emulation (EXPERIMENTAL)"
1574 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1576 Say Y here to include the FAST floating point emulator in the kernel.
1577 This is an experimental much faster emulator which now also has full
1578 precision for the mantissa. It does not support any exceptions.
1579 It is very simple, and approximately 3-6 times faster than NWFPE.
1581 It should be sufficient for most programs. It may be not suitable
1582 for scientific calculations, but you have to check this for yourself.
1583 If you do not feel you need a faster FP emulation you should better
1587 bool "VFP-format floating point maths"
1588 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1590 Say Y to include VFP support code in the kernel. This is needed
1591 if your hardware includes a VFP unit.
1593 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1594 release notes and additional status information.
1596 Say N if your target does not have VFP hardware.
1604 bool "Advanced SIMD (NEON) Extension support"
1605 depends on VFPv3 && CPU_V7
1607 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1612 menu "Userspace binary formats"
1614 source "fs/Kconfig.binfmt"
1617 tristate "RISC OS personality"
1620 Say Y here to include the kernel code necessary if you want to run
1621 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1622 experimental; if this sounds frightening, say N and sleep in peace.
1623 You can also say M here to compile this support as a module (which
1624 will be called arthur).
1628 menu "Power management options"
1630 source "kernel/power/Kconfig"
1632 config ARCH_SUSPEND_POSSIBLE
1637 source "net/Kconfig"
1639 source "drivers/Kconfig"
1643 source "arch/arm/Kconfig.debug"
1645 source "security/Kconfig"
1647 source "crypto/Kconfig"
1649 source "lib/Kconfig"