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)
16 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
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_KERNEL_LZMA
25 select HAVE_PERF_EVENTS
26 select PERF_USE_VMALLOC
28 The ARM series is a line of low-power-consumption RISC chip designs
29 licensed by ARM Ltd and targeted at embedded applications and
30 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
31 manufactured, but legacy ARM-based PC hardware remains popular in
32 Europe. There is an ARM Linux project with a web page at
33 <http://www.arm.linux.org.uk/>.
38 config SYS_SUPPORTS_APM_EMULATION
48 config ARCH_USES_GETTIMEOFFSET
52 config GENERIC_CLOCKEVENTS
55 config GENERIC_CLOCKEVENTS_BROADCAST
57 depends on GENERIC_CLOCKEVENTS
58 default y if SMP && !LOCAL_TIMERS
62 select GENERIC_ALLOCATOR
73 The Extended Industry Standard Architecture (EISA) bus was
74 developed as an open alternative to the IBM MicroChannel bus.
76 The EISA bus provided some of the features of the IBM MicroChannel
77 bus while maintaining backward compatibility with cards made for
78 the older ISA bus. The EISA bus saw limited use between 1988 and
79 1995 when it was made obsolete by the PCI bus.
81 Say Y here if you are building a kernel for an EISA-based machine.
91 MicroChannel Architecture is found in some IBM PS/2 machines and
92 laptops. It is a bus system similar to PCI or ISA. See
93 <file:Documentation/mca.txt> (and especially the web page given
94 there) before attempting to build an MCA bus kernel.
96 config GENERIC_HARDIRQS
100 config STACKTRACE_SUPPORT
104 config HAVE_LATENCYTOP_SUPPORT
109 config LOCKDEP_SUPPORT
113 config TRACE_IRQFLAGS_SUPPORT
117 config HARDIRQS_SW_RESEND
121 config GENERIC_IRQ_PROBE
125 config GENERIC_LOCKBREAK
128 depends on SMP && PREEMPT
130 config RWSEM_GENERIC_SPINLOCK
134 config RWSEM_XCHGADD_ALGORITHM
137 config ARCH_HAS_ILOG2_U32
140 config ARCH_HAS_ILOG2_U64
143 config ARCH_HAS_CPUFREQ
146 Internal node to signify that the ARCH has CPUFREQ support
147 and that the relevant menu configurations are displayed for
150 config GENERIC_HWEIGHT
154 config GENERIC_CALIBRATE_DELAY
158 config ARCH_MAY_HAVE_PC_FDC
164 config NEED_DMA_MAP_STATE
167 config GENERIC_ISA_DMA
176 config GENERIC_HARDIRQS_NO__DO_IRQ
179 config ARM_L1_CACHE_SHIFT_6
182 Setting ARM L1 cache line size to 64 Bytes.
186 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
187 default DRAM_BASE if REMAP_VECTORS_TO_RAM
190 The base address of exception vectors.
192 source "init/Kconfig"
194 source "kernel/Kconfig.freezer"
199 bool "MMU-based Paged Memory Management Support"
202 Select if you want MMU-based virtualised addressing space
203 support by paged memory management. If unsure, say 'Y'.
206 # The "ARM system type" choice list is ordered alphabetically by option
207 # text. Please add new entries in the option alphabetic order.
210 prompt "ARM system type"
211 default ARCH_VERSATILE
214 bool "Agilent AAEC-2000 based"
218 select ARCH_USES_GETTIMEOFFSET
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
228 select GENERIC_CLOCKEVENTS
229 select PLAT_VERSATILE
231 Support for ARM's Integrator platform.
234 bool "ARM Ltd. RealView family"
238 select GENERIC_CLOCKEVENTS
239 select ARCH_WANT_OPTIONAL_GPIOLIB
240 select PLAT_VERSATILE
241 select ARM_TIMER_SP804
242 select GPIO_PL061 if GPIOLIB
244 This enables support for ARM Ltd RealView boards.
246 config ARCH_VERSATILE
247 bool "ARM Ltd. Versatile family"
252 select GENERIC_CLOCKEVENTS
253 select ARCH_WANT_OPTIONAL_GPIOLIB
254 select PLAT_VERSATILE
255 select ARM_TIMER_SP804
257 This enables support for ARM Ltd Versatile board.
260 bool "ARM Ltd. Versatile Express family"
261 select ARCH_WANT_OPTIONAL_GPIOLIB
263 select ARM_TIMER_SP804
265 select GENERIC_CLOCKEVENTS
268 select PLAT_VERSATILE
270 This enables support for the ARM Ltd Versatile Express boards.
274 select ARCH_REQUIRE_GPIOLIB
276 select ARCH_USES_GETTIMEOFFSET
278 This enables support for systems based on the Atmel AT91RM9200,
279 AT91SAM9 and AT91CAP9 processors.
282 bool "Broadcom BCMRING"
287 select GENERIC_CLOCKEVENTS
288 select ARCH_WANT_OPTIONAL_GPIOLIB
290 Support for Broadcom's BCMRing platform.
293 bool "Cirrus Logic CLPS711x/EP721x-based"
295 select ARCH_USES_GETTIMEOFFSET
297 Support for Cirrus Logic 711x/721x based boards.
300 bool "Cavium Networks CNS3XXX family"
302 select GENERIC_CLOCKEVENTS
305 Support for Cavium Networks CNS3XXX platform.
308 bool "Cortina Systems Gemini"
310 select ARCH_REQUIRE_GPIOLIB
311 select ARCH_USES_GETTIMEOFFSET
313 Support for the Cortina Systems Gemini family SoCs
320 select ARCH_USES_GETTIMEOFFSET
322 This is an evaluation board for the StrongARM processor available
323 from Digital. It has limited hardware on-board, including an
324 Ethernet interface, two PCMCIA sockets, two serial ports and a
333 select ARCH_REQUIRE_GPIOLIB
334 select ARCH_HAS_HOLES_MEMORYMODEL
335 select ARCH_USES_GETTIMEOFFSET
337 This enables support for the Cirrus EP93xx series of CPUs.
339 config ARCH_FOOTBRIDGE
343 select ARCH_USES_GETTIMEOFFSET
345 Support for systems based on the DC21285 companion chip
346 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
349 bool "Freescale MXC/iMX-based"
350 select GENERIC_CLOCKEVENTS
351 select ARCH_REQUIRE_GPIOLIB
354 Support for Freescale MXC/iMX-based family of processors
357 bool "Freescale STMP3xxx"
360 select ARCH_REQUIRE_GPIOLIB
361 select GENERIC_CLOCKEVENTS
362 select USB_ARCH_HAS_EHCI
364 Support for systems based on the Freescale 3xxx CPUs.
367 bool "Hilscher NetX based"
370 select GENERIC_CLOCKEVENTS
372 This enables support for systems based on the Hilscher NetX Soc
375 bool "Hynix HMS720x-based"
378 select ARCH_USES_GETTIMEOFFSET
380 This enables support for systems based on the Hynix HMS720x
388 select ARCH_SUPPORTS_MSI
391 Support for Intel's IOP13XX (XScale) family of processors.
399 select ARCH_REQUIRE_GPIOLIB
401 Support for Intel's 80219 and IOP32X (XScale) family of
410 select ARCH_REQUIRE_GPIOLIB
412 Support for Intel's IOP33X (XScale) family of processors.
419 select ARCH_USES_GETTIMEOFFSET
421 Support for Intel's IXP23xx (XScale) family of processors.
424 bool "IXP2400/2800-based"
428 select ARCH_USES_GETTIMEOFFSET
430 Support for Intel's IXP2400/2800 (XScale) family of processors.
437 select GENERIC_CLOCKEVENTS
438 select DMABOUNCE if PCI
440 Support for Intel's IXP4XX (XScale) family of processors.
446 select ARCH_USES_GETTIMEOFFSET
448 Say Y here if you intend to run this kernel on a LinkUp Systems
449 L7200 Software Development Board which uses an ARM720T processor.
450 Information on this board can be obtained at:
452 <http://www.linkupsys.com/>
454 If you have any questions or comments about the Linux kernel port
455 to this board, send e-mail to <sjhill@cotw.com>.
460 select ARCH_REQUIRE_GPIOLIB
461 select GENERIC_CLOCKEVENTS
464 Support for the Marvell Dove SoC 88AP510
467 bool "Marvell Kirkwood"
470 select ARCH_REQUIRE_GPIOLIB
471 select GENERIC_CLOCKEVENTS
474 Support for the following Marvell Kirkwood series SoCs:
475 88F6180, 88F6192 and 88F6281.
478 bool "Marvell Loki (88RC8480)"
480 select GENERIC_CLOCKEVENTS
483 Support for the Marvell Loki (88RC8480) SoC.
486 bool "Marvell MV78xx0"
489 select ARCH_REQUIRE_GPIOLIB
490 select GENERIC_CLOCKEVENTS
493 Support for the following Marvell MV78xx0 series SoCs:
501 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"
512 select ARCH_REQUIRE_GPIOLIB
514 select GENERIC_CLOCKEVENTS
518 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
521 bool "Micrel/Kendin KS8695"
523 select ARCH_REQUIRE_GPIOLIB
524 select ARCH_USES_GETTIMEOFFSET
526 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
527 System-on-Chip devices.
530 bool "NetSilicon NS9xxx"
533 select GENERIC_CLOCKEVENTS
536 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
539 <http://www.digi.com/products/microprocessors/index.jsp>
542 bool "Nuvoton W90X900 CPU"
544 select ARCH_REQUIRE_GPIOLIB
546 select GENERIC_CLOCKEVENTS
548 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
549 At present, the w90x900 has been renamed nuc900, regarding
550 the ARM series product line, you can login the following
551 link address to know more.
553 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
554 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
557 bool "Nuvoton NUC93X CPU"
561 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
562 low-power and high performance MPEG-4/JPEG multimedia controller chip.
565 bool "Philips Nexperia PNX4008 Mobile"
568 select ARCH_USES_GETTIMEOFFSET
570 This enables support for Philips PNX4008 mobile platform.
573 bool "PXA2xx/PXA3xx-based"
576 select ARCH_HAS_CPUFREQ
578 select ARCH_REQUIRE_GPIOLIB
579 select GENERIC_CLOCKEVENTS
583 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
588 select GENERIC_CLOCKEVENTS
590 Support for Qualcomm MSM/QSD based systems. This runs on the
591 apps processor of the MSM/QSD and depends on a shared memory
592 interface to the modem processor which runs the baseband
593 stack and controls some vital subsystems
594 (clock and power control, etc).
597 bool "Renesas SH-Mobile"
599 Support for Renesas's SH-Mobile ARM platforms
606 select ARCH_MAY_HAVE_PC_FDC
607 select HAVE_PATA_PLATFORM
610 select ARCH_SPARSEMEM_ENABLE
611 select ARCH_USES_GETTIMEOFFSET
613 On the Acorn Risc-PC, Linux can support the internal IDE disk and
614 CD-ROM interface, serial and parallel port, and the floppy drive.
620 select ARCH_SPARSEMEM_ENABLE
622 select ARCH_HAS_CPUFREQ
624 select GENERIC_CLOCKEVENTS
627 select ARCH_REQUIRE_GPIOLIB
629 Support for StrongARM 11x0 based boards.
632 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
634 select ARCH_HAS_CPUFREQ
636 select ARCH_USES_GETTIMEOFFSET
637 select HAVE_S3C2410_I2C
639 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
640 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
641 the Samsung SMDK2410 development board (and derivatives).
643 Note, the S3C2416 and the S3C2450 are so close that they even share
644 the same SoC ID code. This means that there is no seperate machine
645 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
648 bool "Samsung S3C64XX"
654 select ARCH_USES_GETTIMEOFFSET
655 select ARCH_HAS_CPUFREQ
656 select ARCH_REQUIRE_GPIOLIB
657 select SAMSUNG_CLKSRC
658 select SAMSUNG_IRQ_VIC_TIMER
659 select SAMSUNG_IRQ_UART
660 select S3C_GPIO_TRACK
661 select S3C_GPIO_PULL_UPDOWN
662 select S3C_GPIO_CFG_S3C24XX
663 select S3C_GPIO_CFG_S3C64XX
665 select USB_ARCH_HAS_OHCI
666 select SAMSUNG_GPIOLIB_4BIT
667 select HAVE_S3C2410_I2C
668 select HAVE_S3C2410_WATCHDOG
670 Samsung S3C64XX series based systems
673 bool "Samsung S5P6440"
677 select HAVE_S3C2410_WATCHDOG
678 select ARCH_USES_GETTIMEOFFSET
679 select HAVE_S3C2410_I2C
682 Samsung S5P6440 CPU based systems
685 bool "Samsung S5P6442"
689 select ARCH_USES_GETTIMEOFFSET
690 select HAVE_S3C2410_WATCHDOG
692 Samsung S5P6442 CPU based systems
695 bool "Samsung S5PC100"
699 select ARM_L1_CACHE_SHIFT_6
700 select ARCH_USES_GETTIMEOFFSET
701 select HAVE_S3C2410_I2C
703 select HAVE_S3C2410_WATCHDOG
705 Samsung S5PC100 series based systems
708 bool "Samsung S5PV210/S5PC110"
712 select ARM_L1_CACHE_SHIFT_6
713 select ARCH_USES_GETTIMEOFFSET
714 select HAVE_S3C2410_I2C
716 select HAVE_S3C2410_WATCHDOG
718 Samsung S5PV210/S5PC110 series based systems
721 bool "Samsung S5PV310/S5PC210"
725 select GENERIC_CLOCKEVENTS
727 Samsung S5PV310 series based systems
736 select ARCH_USES_GETTIMEOFFSET
738 Support for the StrongARM based Digital DNARD machine, also known
739 as "Shark" (<http://www.shark-linux.de/shark.html>).
744 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
745 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
746 select ARCH_USES_GETTIMEOFFSET
748 Say Y here for systems based on one of the Sharp LH7A40X
749 System on a Chip processors. These CPUs include an ARM922T
750 core with a wide array of integrated devices for
751 hand-held and low-power applications.
754 bool "ST-Ericsson U300 Series"
760 select GENERIC_CLOCKEVENTS
764 Support for ST-Ericsson U300 series mobile platforms.
767 bool "ST-Ericsson U8500 Series"
770 select GENERIC_CLOCKEVENTS
772 select ARCH_REQUIRE_GPIOLIB
774 Support for ST-Ericsson's Ux500 architecture
777 bool "STMicroelectronics Nomadik"
782 select GENERIC_CLOCKEVENTS
783 select ARCH_REQUIRE_GPIOLIB
785 Support for the Nomadik platform by ST-Ericsson
789 select GENERIC_CLOCKEVENTS
790 select ARCH_REQUIRE_GPIOLIB
794 select GENERIC_ALLOCATOR
795 select ARCH_HAS_HOLES_MEMORYMODEL
797 Support for TI's DaVinci platform.
802 select ARCH_REQUIRE_GPIOLIB
803 select ARCH_HAS_CPUFREQ
804 select GENERIC_CLOCKEVENTS
805 select ARCH_HAS_HOLES_MEMORYMODEL
807 Support for TI's OMAP platform (OMAP1 and OMAP2).
812 select ARCH_REQUIRE_GPIOLIB
814 select GENERIC_CLOCKEVENTS
817 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
822 # This is sorted alphabetically by mach-* pathname. However, plat-*
823 # Kconfigs may be included either alphabetically (according to the
824 # plat- suffix) or along side the corresponding mach-* source.
826 source "arch/arm/mach-aaec2000/Kconfig"
828 source "arch/arm/mach-at91/Kconfig"
830 source "arch/arm/mach-bcmring/Kconfig"
832 source "arch/arm/mach-clps711x/Kconfig"
834 source "arch/arm/mach-cns3xxx/Kconfig"
836 source "arch/arm/mach-davinci/Kconfig"
838 source "arch/arm/mach-dove/Kconfig"
840 source "arch/arm/mach-ep93xx/Kconfig"
842 source "arch/arm/mach-footbridge/Kconfig"
844 source "arch/arm/mach-gemini/Kconfig"
846 source "arch/arm/mach-h720x/Kconfig"
848 source "arch/arm/mach-integrator/Kconfig"
850 source "arch/arm/mach-iop32x/Kconfig"
852 source "arch/arm/mach-iop33x/Kconfig"
854 source "arch/arm/mach-iop13xx/Kconfig"
856 source "arch/arm/mach-ixp4xx/Kconfig"
858 source "arch/arm/mach-ixp2000/Kconfig"
860 source "arch/arm/mach-ixp23xx/Kconfig"
862 source "arch/arm/mach-kirkwood/Kconfig"
864 source "arch/arm/mach-ks8695/Kconfig"
866 source "arch/arm/mach-lh7a40x/Kconfig"
868 source "arch/arm/mach-loki/Kconfig"
870 source "arch/arm/mach-msm/Kconfig"
872 source "arch/arm/mach-mv78xx0/Kconfig"
874 source "arch/arm/plat-mxc/Kconfig"
876 source "arch/arm/mach-netx/Kconfig"
878 source "arch/arm/mach-nomadik/Kconfig"
879 source "arch/arm/plat-nomadik/Kconfig"
881 source "arch/arm/mach-ns9xxx/Kconfig"
883 source "arch/arm/mach-nuc93x/Kconfig"
885 source "arch/arm/plat-omap/Kconfig"
887 source "arch/arm/mach-omap1/Kconfig"
889 source "arch/arm/mach-omap2/Kconfig"
891 source "arch/arm/mach-orion5x/Kconfig"
893 source "arch/arm/mach-pxa/Kconfig"
894 source "arch/arm/plat-pxa/Kconfig"
896 source "arch/arm/mach-mmp/Kconfig"
898 source "arch/arm/mach-realview/Kconfig"
900 source "arch/arm/mach-sa1100/Kconfig"
902 source "arch/arm/plat-samsung/Kconfig"
903 source "arch/arm/plat-s3c24xx/Kconfig"
904 source "arch/arm/plat-s5p/Kconfig"
906 source "arch/arm/plat-spear/Kconfig"
909 source "arch/arm/mach-s3c2400/Kconfig"
910 source "arch/arm/mach-s3c2410/Kconfig"
911 source "arch/arm/mach-s3c2412/Kconfig"
912 source "arch/arm/mach-s3c2416/Kconfig"
913 source "arch/arm/mach-s3c2440/Kconfig"
914 source "arch/arm/mach-s3c2443/Kconfig"
918 source "arch/arm/mach-s3c64xx/Kconfig"
921 source "arch/arm/mach-s5p6440/Kconfig"
923 source "arch/arm/mach-s5p6442/Kconfig"
925 source "arch/arm/mach-s5pc100/Kconfig"
927 source "arch/arm/mach-s5pv210/Kconfig"
929 source "arch/arm/mach-s5pv310/Kconfig"
931 source "arch/arm/mach-shmobile/Kconfig"
933 source "arch/arm/plat-stmp3xxx/Kconfig"
935 source "arch/arm/mach-u300/Kconfig"
937 source "arch/arm/mach-ux500/Kconfig"
939 source "arch/arm/mach-versatile/Kconfig"
941 source "arch/arm/mach-vexpress/Kconfig"
943 source "arch/arm/mach-w90x900/Kconfig"
945 # Definitions to make life easier
951 select GENERIC_CLOCKEVENTS
959 config PLAT_VERSATILE
962 config ARM_TIMER_SP804
965 source arch/arm/mm/Kconfig
968 bool "Enable iWMMXt support"
969 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
970 default y if PXA27x || PXA3xx || ARCH_MMP
972 Enable support for iWMMXt context switching at run time if
973 running on a CPU that supports it.
975 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
978 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
982 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
983 (!ARCH_OMAP3 || OMAP3_EMU)
988 source "arch/arm/Kconfig-nommu"
991 config ARM_ERRATA_411920
992 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
993 depends on CPU_V6 && !SMP
995 Invalidation of the Instruction Cache operation can
996 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
997 It does not affect the MPCore. This option enables the ARM Ltd.
998 recommended workaround.
1000 config ARM_ERRATA_430973
1001 bool "ARM errata: Stale prediction on replaced interworking branch"
1004 This option enables the workaround for the 430973 Cortex-A8
1005 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1006 interworking branch is replaced with another code sequence at the
1007 same virtual address, whether due to self-modifying code or virtual
1008 to physical address re-mapping, Cortex-A8 does not recover from the
1009 stale interworking branch prediction. This results in Cortex-A8
1010 executing the new code sequence in the incorrect ARM or Thumb state.
1011 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1012 and also flushes the branch target cache at every context switch.
1013 Note that setting specific bits in the ACTLR register may not be
1014 available in non-secure mode.
1016 config ARM_ERRATA_458693
1017 bool "ARM errata: Processor deadlock when a false hazard is created"
1020 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1021 erratum. For very specific sequences of memory operations, it is
1022 possible for a hazard condition intended for a cache line to instead
1023 be incorrectly associated with a different cache line. This false
1024 hazard might then cause a processor deadlock. The workaround enables
1025 the L1 caching of the NEON accesses and disables the PLD instruction
1026 in the ACTLR register. Note that setting specific bits in the ACTLR
1027 register may not be available in non-secure mode.
1029 config ARM_ERRATA_460075
1030 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1033 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1034 erratum. Any asynchronous access to the L2 cache may encounter a
1035 situation in which recent store transactions to the L2 cache are lost
1036 and overwritten with stale memory contents from external memory. The
1037 workaround disables the write-allocate mode for the L2 cache via the
1038 ACTLR register. Note that setting specific bits in the ACTLR register
1039 may not be available in non-secure mode.
1041 config PL310_ERRATA_588369
1042 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1043 depends on CACHE_L2X0 && ARCH_OMAP4
1045 The PL310 L2 cache controller implements three types of Clean &
1046 Invalidate maintenance operations: by Physical Address
1047 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1048 They are architecturally defined to behave as the execution of a
1049 clean operation followed immediately by an invalidate operation,
1050 both performing to the same memory location. This functionality
1051 is not correctly implemented in PL310 as clean lines are not
1052 invalidated as a result of these operations. Note that this errata
1053 uses Texas Instrument's secure monitor api.
1056 source "arch/arm/common/Kconfig"
1058 config FORCE_MAX_ZONEORDER
1071 Find out whether you have ISA slots on your motherboard. ISA is the
1072 name of a bus system, i.e. the way the CPU talks to the other stuff
1073 inside your box. Other bus systems are PCI, EISA, MicroChannel
1074 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1075 newer boards don't support it. If you have ISA, say Y, otherwise N.
1077 # Select ISA DMA controller support
1082 # Select ISA DMA interface
1087 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1089 Find out whether you have a PCI motherboard. PCI is the name of a
1090 bus system, i.e. the way the CPU talks to the other stuff inside
1091 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1092 VESA. If you have PCI, say Y, otherwise N.
1101 # Select the host bridge type
1102 config PCI_HOST_VIA82C505
1104 depends on PCI && ARCH_SHARK
1107 config PCI_HOST_ITE8152
1109 depends on PCI && MACH_ARMCORE
1113 source "drivers/pci/Kconfig"
1115 source "drivers/pcmcia/Kconfig"
1119 menu "Kernel Features"
1121 source "kernel/time/Kconfig"
1124 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1125 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1126 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1127 ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || ARCH_S5PV310)
1128 depends on GENERIC_CLOCKEVENTS
1129 select USE_GENERIC_SMP_HELPERS
1130 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 ||\
1133 This enables support for systems with more than one CPU. If you have
1134 a system with only one CPU, like most personal computers, say N. If
1135 you have a system with more than one CPU, say Y.
1137 If you say N here, the kernel will run on single and multiprocessor
1138 machines, but will use only one CPU of a multiprocessor machine. If
1139 you say Y here, the kernel will run on many, but not all, single
1140 processor machines. On a single processor machine, the kernel will
1141 run faster if you say N here.
1143 See also <file:Documentation/i386/IO-APIC.txt>,
1144 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1145 <http://www.linuxdoc.org/docs.html#howto>.
1147 If you don't know what to do here, say N.
1153 This option enables support for the ARM system coherency unit
1159 This options enables support for the ARM timer and watchdog unit
1162 prompt "Memory split"
1165 Select the desired split between kernel and user memory.
1167 If you are not absolutely sure what you are doing, leave this
1171 bool "3G/1G user/kernel split"
1173 bool "2G/2G user/kernel split"
1175 bool "1G/3G user/kernel split"
1180 default 0x40000000 if VMSPLIT_1G
1181 default 0x80000000 if VMSPLIT_2G
1185 int "Maximum number of CPUs (2-32)"
1191 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1192 depends on SMP && HOTPLUG && EXPERIMENTAL
1194 Say Y here to experiment with turning CPUs off and on. CPUs
1195 can be controlled through /sys/devices/system/cpu.
1198 bool "Use local timer interrupts"
1199 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1200 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1201 ARCH_U8500 || ARCH_S5PV310)
1203 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_S5PV310)
1205 Enable support for local timers on SMP platforms, rather then the
1206 legacy IPI broadcast method. Local timers allows the system
1207 accounting to be spread across the timer interval, preventing a
1208 "thundering herd" at every timer tick.
1210 source kernel/Kconfig.preempt
1214 default 128 if ARCH_L7200
1215 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || \
1216 ARCH_S5PV210 || ARCH_S5PV310
1217 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1218 default AT91_TIMER_HZ if ARCH_AT91
1221 config THUMB2_KERNEL
1222 bool "Compile the kernel in Thumb-2 mode"
1223 depends on CPU_V7 && EXPERIMENTAL
1225 select ARM_ASM_UNIFIED
1227 By enabling this option, the kernel will be compiled in
1228 Thumb-2 mode. A compiler/assembler that understand the unified
1229 ARM-Thumb syntax is needed.
1233 config ARM_ASM_UNIFIED
1237 bool "Use the ARM EABI to compile the kernel"
1239 This option allows for the kernel to be compiled using the latest
1240 ARM ABI (aka EABI). This is only useful if you are using a user
1241 space environment that is also compiled with EABI.
1243 Since there are major incompatibilities between the legacy ABI and
1244 EABI, especially with regard to structure member alignment, this
1245 option also changes the kernel syscall calling convention to
1246 disambiguate both ABIs and allow for backward compatibility support
1247 (selected with CONFIG_OABI_COMPAT).
1249 To use this you need GCC version 4.0.0 or later.
1252 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1253 depends on AEABI && EXPERIMENTAL
1256 This option preserves the old syscall interface along with the
1257 new (ARM EABI) one. It also provides a compatibility layer to
1258 intercept syscalls that have structure arguments which layout
1259 in memory differs between the legacy ABI and the new ARM EABI
1260 (only for non "thumb" binaries). This option adds a tiny
1261 overhead to all syscalls and produces a slightly larger kernel.
1262 If you know you'll be using only pure EABI user space then you
1263 can say N here. If this option is not selected and you attempt
1264 to execute a legacy ABI binary then the result will be
1265 UNPREDICTABLE (in fact it can be predicted that it won't work
1266 at all). If in doubt say Y.
1268 config ARCH_HAS_HOLES_MEMORYMODEL
1271 # Discontigmem is deprecated
1272 config ARCH_DISCONTIGMEM_ENABLE
1275 config ARCH_SPARSEMEM_ENABLE
1278 config ARCH_SPARSEMEM_DEFAULT
1279 def_bool ARCH_SPARSEMEM_ENABLE
1281 config ARCH_SELECT_MEMORY_MODEL
1282 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1286 default "4" if ARCH_LH7A40X
1288 depends on NEED_MULTIPLE_NODES
1291 bool "High Memory Support (EXPERIMENTAL)"
1292 depends on MMU && EXPERIMENTAL
1294 The address space of ARM processors is only 4 Gigabytes large
1295 and it has to accommodate user address space, kernel address
1296 space as well as some memory mapped IO. That means that, if you
1297 have a large amount of physical memory and/or IO, not all of the
1298 memory can be "permanently mapped" by the kernel. The physical
1299 memory that is not permanently mapped is called "high memory".
1301 Depending on the selected kernel/user memory split, minimum
1302 vmalloc space and actual amount of RAM, you may not need this
1303 option which should result in a slightly faster kernel.
1308 bool "Allocate 2nd-level pagetables from highmem"
1310 depends on !OUTER_CACHE
1312 config HW_PERF_EVENTS
1313 bool "Enable hardware performance counter support for perf events"
1314 depends on PERF_EVENTS && CPU_HAS_PMU
1317 Enable hardware performance counter support for perf events. If
1318 disabled, perf events will use software events only.
1323 bool "Timer and CPU usage LEDs"
1324 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1325 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1326 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1327 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1328 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1329 ARCH_AT91 || ARCH_DAVINCI || \
1330 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1332 If you say Y here, the LEDs on your machine will be used
1333 to provide useful information about your current system status.
1335 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1336 be able to select which LEDs are active using the options below. If
1337 you are compiling a kernel for the EBSA-110 or the LART however, the
1338 red LED will simply flash regularly to indicate that the system is
1339 still functional. It is safe to say Y here if you have a CATS
1340 system, but the driver will do nothing.
1343 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1344 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1345 || MACH_OMAP_PERSEUS2
1347 depends on !GENERIC_CLOCKEVENTS
1348 default y if ARCH_EBSA110
1350 If you say Y here, one of the system LEDs (the green one on the
1351 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1352 will flash regularly to indicate that the system is still
1353 operational. This is mainly useful to kernel hackers who are
1354 debugging unstable kernels.
1356 The LART uses the same LED for both Timer LED and CPU usage LED
1357 functions. You may choose to use both, but the Timer LED function
1358 will overrule the CPU usage LED.
1361 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1363 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1364 || MACH_OMAP_PERSEUS2
1367 If you say Y here, the red LED will be used to give a good real
1368 time indication of CPU usage, by lighting whenever the idle task
1369 is not currently executing.
1371 The LART uses the same LED for both Timer LED and CPU usage LED
1372 functions. You may choose to use both, but the Timer LED function
1373 will overrule the CPU usage LED.
1375 config ALIGNMENT_TRAP
1377 depends on CPU_CP15_MMU
1378 default y if !ARCH_EBSA110
1379 select HAVE_PROC_CPU if PROC_FS
1381 ARM processors cannot fetch/store information which is not
1382 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1383 address divisible by 4. On 32-bit ARM processors, these non-aligned
1384 fetch/store instructions will be emulated in software if you say
1385 here, which has a severe performance impact. This is necessary for
1386 correct operation of some network protocols. With an IP-only
1387 configuration it is safe to say N, otherwise say Y.
1389 config UACCESS_WITH_MEMCPY
1390 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1391 depends on MMU && EXPERIMENTAL
1392 default y if CPU_FEROCEON
1394 Implement faster copy_to_user and clear_user methods for CPU
1395 cores where a 8-word STM instruction give significantly higher
1396 memory write throughput than a sequence of individual 32bit stores.
1398 A possible side effect is a slight increase in scheduling latency
1399 between threads sharing the same address space if they invoke
1400 such copy operations with large buffers.
1402 However, if the CPU data cache is using a write-allocate mode,
1403 this option is unlikely to provide any performance gain.
1409 # Compressed boot loader in ROM. Yes, we really want to ask about
1410 # TEXT and BSS so we preserve their values in the config files.
1411 config ZBOOT_ROM_TEXT
1412 hex "Compressed ROM boot loader base address"
1415 The physical address at which the ROM-able zImage is to be
1416 placed in the target. Platforms which normally make use of
1417 ROM-able zImage formats normally set this to a suitable
1418 value in their defconfig file.
1420 If ZBOOT_ROM is not enabled, this has no effect.
1422 config ZBOOT_ROM_BSS
1423 hex "Compressed ROM boot loader BSS address"
1426 The base address of an area of read/write memory in the target
1427 for the ROM-able zImage which must be available while the
1428 decompressor is running. It must be large enough to hold the
1429 entire decompressed kernel plus an additional 128 KiB.
1430 Platforms which normally make use of ROM-able zImage formats
1431 normally set this to a suitable value in their defconfig file.
1433 If ZBOOT_ROM is not enabled, this has no effect.
1436 bool "Compressed boot loader in ROM/flash"
1437 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1439 Say Y here if you intend to execute your compressed kernel image
1440 (zImage) directly from ROM or flash. If unsure, say N.
1443 string "Default kernel command string"
1446 On some architectures (EBSA110 and CATS), there is currently no way
1447 for the boot loader to pass arguments to the kernel. For these
1448 architectures, you should supply some command-line options at build
1449 time by entering them here. As a minimum, you should specify the
1450 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1452 config CMDLINE_FORCE
1453 bool "Always use the default kernel command string"
1454 depends on CMDLINE != ""
1456 Always use the default kernel command string, even if the boot
1457 loader passes other arguments to the kernel.
1458 This is useful if you cannot or don't want to change the
1459 command-line options your boot loader passes to the kernel.
1464 bool "Kernel Execute-In-Place from ROM"
1465 depends on !ZBOOT_ROM
1467 Execute-In-Place allows the kernel to run from non-volatile storage
1468 directly addressable by the CPU, such as NOR flash. This saves RAM
1469 space since the text section of the kernel is not loaded from flash
1470 to RAM. Read-write sections, such as the data section and stack,
1471 are still copied to RAM. The XIP kernel is not compressed since
1472 it has to run directly from flash, so it will take more space to
1473 store it. The flash address used to link the kernel object files,
1474 and for storing it, is configuration dependent. Therefore, if you
1475 say Y here, you must know the proper physical address where to
1476 store the kernel image depending on your own flash memory usage.
1478 Also note that the make target becomes "make xipImage" rather than
1479 "make zImage" or "make Image". The final kernel binary to put in
1480 ROM memory will be arch/arm/boot/xipImage.
1484 config XIP_PHYS_ADDR
1485 hex "XIP Kernel Physical Location"
1486 depends on XIP_KERNEL
1487 default "0x00080000"
1489 This is the physical address in your flash memory the kernel will
1490 be linked for and stored to. This address is dependent on your
1494 bool "Kexec system call (EXPERIMENTAL)"
1495 depends on EXPERIMENTAL
1497 kexec is a system call that implements the ability to shutdown your
1498 current kernel, and to start another kernel. It is like a reboot
1499 but it is independent of the system firmware. And like a reboot
1500 you can start any kernel with it, not just Linux.
1502 It is an ongoing process to be certain the hardware in a machine
1503 is properly shutdown, so do not be surprised if this code does not
1504 initially work for you. It may help to enable device hotplugging
1508 bool "Export atags in procfs"
1512 Should the atags used to boot the kernel be exported in an "atags"
1513 file in procfs. Useful with kexec.
1517 menu "CPU Power Management"
1521 source "drivers/cpufreq/Kconfig"
1523 config CPU_FREQ_SA1100
1526 config CPU_FREQ_SA1110
1529 config CPU_FREQ_INTEGRATOR
1530 tristate "CPUfreq driver for ARM Integrator CPUs"
1531 depends on ARCH_INTEGRATOR && CPU_FREQ
1534 This enables the CPUfreq driver for ARM Integrator CPUs.
1536 For details, take a look at <file:Documentation/cpu-freq>.
1542 depends on CPU_FREQ && ARCH_PXA && PXA25x
1544 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1546 config CPU_FREQ_S3C64XX
1547 bool "CPUfreq support for Samsung S3C64XX CPUs"
1548 depends on CPU_FREQ && CPU_S3C6410
1553 Internal configuration node for common cpufreq on Samsung SoC
1555 config CPU_FREQ_S3C24XX
1556 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1557 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1560 This enables the CPUfreq driver for the Samsung S3C24XX family
1563 For details, take a look at <file:Documentation/cpu-freq>.
1567 config CPU_FREQ_S3C24XX_PLL
1568 bool "Support CPUfreq changing of PLL frequency"
1569 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1571 Compile in support for changing the PLL frequency from the
1572 S3C24XX series CPUfreq driver. The PLL takes time to settle
1573 after a frequency change, so by default it is not enabled.
1575 This also means that the PLL tables for the selected CPU(s) will
1576 be built which may increase the size of the kernel image.
1578 config CPU_FREQ_S3C24XX_DEBUG
1579 bool "Debug CPUfreq Samsung driver core"
1580 depends on CPU_FREQ_S3C24XX
1582 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1584 config CPU_FREQ_S3C24XX_IODEBUG
1585 bool "Debug CPUfreq Samsung driver IO timing"
1586 depends on CPU_FREQ_S3C24XX
1588 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1590 config CPU_FREQ_S3C24XX_DEBUGFS
1591 bool "Export debugfs for CPUFreq"
1592 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1594 Export status information via debugfs.
1598 source "drivers/cpuidle/Kconfig"
1602 menu "Floating point emulation"
1604 comment "At least one emulation must be selected"
1607 bool "NWFPE math emulation"
1608 depends on !AEABI || OABI_COMPAT
1610 Say Y to include the NWFPE floating point emulator in the kernel.
1611 This is necessary to run most binaries. Linux does not currently
1612 support floating point hardware so you need to say Y here even if
1613 your machine has an FPA or floating point co-processor podule.
1615 You may say N here if you are going to load the Acorn FPEmulator
1616 early in the bootup.
1619 bool "Support extended precision"
1620 depends on FPE_NWFPE
1622 Say Y to include 80-bit support in the kernel floating-point
1623 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1624 Note that gcc does not generate 80-bit operations by default,
1625 so in most cases this option only enlarges the size of the
1626 floating point emulator without any good reason.
1628 You almost surely want to say N here.
1631 bool "FastFPE math emulation (EXPERIMENTAL)"
1632 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1634 Say Y here to include the FAST floating point emulator in the kernel.
1635 This is an experimental much faster emulator which now also has full
1636 precision for the mantissa. It does not support any exceptions.
1637 It is very simple, and approximately 3-6 times faster than NWFPE.
1639 It should be sufficient for most programs. It may be not suitable
1640 for scientific calculations, but you have to check this for yourself.
1641 If you do not feel you need a faster FP emulation you should better
1645 bool "VFP-format floating point maths"
1646 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1648 Say Y to include VFP support code in the kernel. This is needed
1649 if your hardware includes a VFP unit.
1651 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1652 release notes and additional status information.
1654 Say N if your target does not have VFP hardware.
1662 bool "Advanced SIMD (NEON) Extension support"
1663 depends on VFPv3 && CPU_V7
1665 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1670 menu "Userspace binary formats"
1672 source "fs/Kconfig.binfmt"
1675 tristate "RISC OS personality"
1678 Say Y here to include the kernel code necessary if you want to run
1679 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1680 experimental; if this sounds frightening, say N and sleep in peace.
1681 You can also say M here to compile this support as a module (which
1682 will be called arthur).
1686 menu "Power management options"
1688 source "kernel/power/Kconfig"
1690 config ARCH_SUSPEND_POSSIBLE
1695 source "net/Kconfig"
1697 source "drivers/Kconfig"
1701 source "arch/arm/Kconfig.debug"
1703 source "security/Kconfig"
1705 source "crypto/Kconfig"
1707 source "lib/Kconfig"