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
638 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
639 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
640 the Samsung SMDK2410 development board (and derivatives).
642 Note, the S3C2416 and the S3C2450 are so close that they even share
643 the same SoC ID code. This means that there is no seperate machine
644 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
647 bool "Samsung S3C64XX"
653 select ARCH_USES_GETTIMEOFFSET
654 select ARCH_HAS_CPUFREQ
655 select ARCH_REQUIRE_GPIOLIB
656 select SAMSUNG_CLKSRC
657 select SAMSUNG_IRQ_VIC_TIMER
658 select SAMSUNG_IRQ_UART
659 select S3C_GPIO_TRACK
660 select S3C_GPIO_PULL_UPDOWN
661 select S3C_GPIO_CFG_S3C24XX
662 select S3C_GPIO_CFG_S3C64XX
664 select USB_ARCH_HAS_OHCI
665 select SAMSUNG_GPIOLIB_4BIT
667 Samsung S3C64XX series based systems
670 bool "Samsung S5P6440"
675 Samsung S5P6440 CPU based systems
678 bool "Samsung S5P6442"
683 Samsung S5P6442 CPU based systems
686 bool "Samsung S5PC1XX"
690 select ARM_L1_CACHE_SHIFT_6
692 Samsung S5PC1XX series based systems
695 bool "Samsung S5PV210/S5PC110"
699 select ARM_L1_CACHE_SHIFT_6
701 Samsung S5PV210/S5PC110 series based systems
710 select ARCH_USES_GETTIMEOFFSET
712 Support for the StrongARM based Digital DNARD machine, also known
713 as "Shark" (<http://www.shark-linux.de/shark.html>).
718 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
719 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
720 select ARCH_USES_GETTIMEOFFSET
722 Say Y here for systems based on one of the Sharp LH7A40X
723 System on a Chip processors. These CPUs include an ARM922T
724 core with a wide array of integrated devices for
725 hand-held and low-power applications.
728 bool "ST-Ericsson U300 Series"
734 select GENERIC_CLOCKEVENTS
738 Support for ST-Ericsson U300 series mobile platforms.
741 bool "ST-Ericsson U8500 Series"
744 select GENERIC_CLOCKEVENTS
746 select ARCH_REQUIRE_GPIOLIB
748 Support for ST-Ericsson's Ux500 architecture
751 bool "STMicroelectronics Nomadik"
756 select GENERIC_CLOCKEVENTS
757 select ARCH_REQUIRE_GPIOLIB
759 Support for the Nomadik platform by ST-Ericsson
763 select GENERIC_CLOCKEVENTS
764 select ARCH_REQUIRE_GPIOLIB
768 select GENERIC_ALLOCATOR
769 select ARCH_HAS_HOLES_MEMORYMODEL
771 Support for TI's DaVinci platform.
776 select ARCH_REQUIRE_GPIOLIB
777 select ARCH_HAS_CPUFREQ
778 select GENERIC_CLOCKEVENTS
779 select ARCH_HAS_HOLES_MEMORYMODEL
781 Support for TI's OMAP platform (OMAP1 and OMAP2).
786 select ARCH_REQUIRE_GPIOLIB
788 select GENERIC_CLOCKEVENTS
791 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
796 # This is sorted alphabetically by mach-* pathname. However, plat-*
797 # Kconfigs may be included either alphabetically (according to the
798 # plat- suffix) or along side the corresponding mach-* source.
800 source "arch/arm/mach-aaec2000/Kconfig"
802 source "arch/arm/mach-at91/Kconfig"
804 source "arch/arm/mach-bcmring/Kconfig"
806 source "arch/arm/mach-clps711x/Kconfig"
808 source "arch/arm/mach-cns3xxx/Kconfig"
810 source "arch/arm/mach-davinci/Kconfig"
812 source "arch/arm/mach-dove/Kconfig"
814 source "arch/arm/mach-ep93xx/Kconfig"
816 source "arch/arm/mach-footbridge/Kconfig"
818 source "arch/arm/mach-gemini/Kconfig"
820 source "arch/arm/mach-h720x/Kconfig"
822 source "arch/arm/mach-integrator/Kconfig"
824 source "arch/arm/mach-iop32x/Kconfig"
826 source "arch/arm/mach-iop33x/Kconfig"
828 source "arch/arm/mach-iop13xx/Kconfig"
830 source "arch/arm/mach-ixp4xx/Kconfig"
832 source "arch/arm/mach-ixp2000/Kconfig"
834 source "arch/arm/mach-ixp23xx/Kconfig"
836 source "arch/arm/mach-kirkwood/Kconfig"
838 source "arch/arm/mach-ks8695/Kconfig"
840 source "arch/arm/mach-lh7a40x/Kconfig"
842 source "arch/arm/mach-loki/Kconfig"
844 source "arch/arm/mach-msm/Kconfig"
846 source "arch/arm/mach-mv78xx0/Kconfig"
848 source "arch/arm/plat-mxc/Kconfig"
850 source "arch/arm/mach-netx/Kconfig"
852 source "arch/arm/mach-nomadik/Kconfig"
853 source "arch/arm/plat-nomadik/Kconfig"
855 source "arch/arm/mach-ns9xxx/Kconfig"
857 source "arch/arm/mach-nuc93x/Kconfig"
859 source "arch/arm/plat-omap/Kconfig"
861 source "arch/arm/mach-omap1/Kconfig"
863 source "arch/arm/mach-omap2/Kconfig"
865 source "arch/arm/mach-orion5x/Kconfig"
867 source "arch/arm/mach-pxa/Kconfig"
868 source "arch/arm/plat-pxa/Kconfig"
870 source "arch/arm/mach-mmp/Kconfig"
872 source "arch/arm/mach-realview/Kconfig"
874 source "arch/arm/mach-sa1100/Kconfig"
876 source "arch/arm/plat-samsung/Kconfig"
877 source "arch/arm/plat-s3c24xx/Kconfig"
878 source "arch/arm/plat-s5p/Kconfig"
879 source "arch/arm/plat-s5pc1xx/Kconfig"
880 source "arch/arm/plat-spear/Kconfig"
883 source "arch/arm/mach-s3c2400/Kconfig"
884 source "arch/arm/mach-s3c2410/Kconfig"
885 source "arch/arm/mach-s3c2412/Kconfig"
886 source "arch/arm/mach-s3c2416/Kconfig"
887 source "arch/arm/mach-s3c2440/Kconfig"
888 source "arch/arm/mach-s3c2443/Kconfig"
892 source "arch/arm/mach-s3c64xx/Kconfig"
895 source "arch/arm/mach-s5p6440/Kconfig"
897 source "arch/arm/mach-s5p6442/Kconfig"
900 source "arch/arm/mach-s5pc100/Kconfig"
903 source "arch/arm/mach-s5pv210/Kconfig"
905 source "arch/arm/mach-shmobile/Kconfig"
907 source "arch/arm/plat-stmp3xxx/Kconfig"
909 source "arch/arm/mach-u300/Kconfig"
911 source "arch/arm/mach-ux500/Kconfig"
913 source "arch/arm/mach-versatile/Kconfig"
915 source "arch/arm/mach-vexpress/Kconfig"
917 source "arch/arm/mach-w90x900/Kconfig"
919 # Definitions to make life easier
925 select GENERIC_CLOCKEVENTS
933 config PLAT_VERSATILE
936 config ARM_TIMER_SP804
939 source arch/arm/mm/Kconfig
942 bool "Enable iWMMXt support"
943 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
944 default y if PXA27x || PXA3xx || ARCH_MMP
946 Enable support for iWMMXt context switching at run time if
947 running on a CPU that supports it.
949 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
952 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
956 depends on CPU_V6 || CPU_V7 || XSCALE_PMU
961 source "arch/arm/Kconfig-nommu"
964 config ARM_ERRATA_411920
965 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
966 depends on CPU_V6 && !SMP
968 Invalidation of the Instruction Cache operation can
969 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
970 It does not affect the MPCore. This option enables the ARM Ltd.
971 recommended workaround.
973 config ARM_ERRATA_430973
974 bool "ARM errata: Stale prediction on replaced interworking branch"
977 This option enables the workaround for the 430973 Cortex-A8
978 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
979 interworking branch is replaced with another code sequence at the
980 same virtual address, whether due to self-modifying code or virtual
981 to physical address re-mapping, Cortex-A8 does not recover from the
982 stale interworking branch prediction. This results in Cortex-A8
983 executing the new code sequence in the incorrect ARM or Thumb state.
984 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
985 and also flushes the branch target cache at every context switch.
986 Note that setting specific bits in the ACTLR register may not be
987 available in non-secure mode.
989 config ARM_ERRATA_458693
990 bool "ARM errata: Processor deadlock when a false hazard is created"
993 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
994 erratum. For very specific sequences of memory operations, it is
995 possible for a hazard condition intended for a cache line to instead
996 be incorrectly associated with a different cache line. This false
997 hazard might then cause a processor deadlock. The workaround enables
998 the L1 caching of the NEON accesses and disables the PLD instruction
999 in the ACTLR register. Note that setting specific bits in the ACTLR
1000 register may not be available in non-secure mode.
1002 config ARM_ERRATA_460075
1003 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1006 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1007 erratum. Any asynchronous access to the L2 cache may encounter a
1008 situation in which recent store transactions to the L2 cache are lost
1009 and overwritten with stale memory contents from external memory. The
1010 workaround disables the write-allocate mode for the L2 cache via the
1011 ACTLR register. Note that setting specific bits in the ACTLR register
1012 may not be available in non-secure mode.
1014 config PL310_ERRATA_588369
1015 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1016 depends on CACHE_L2X0 && ARCH_OMAP4
1018 The PL310 L2 cache controller implements three types of Clean &
1019 Invalidate maintenance operations: by Physical Address
1020 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1021 They are architecturally defined to behave as the execution of a
1022 clean operation followed immediately by an invalidate operation,
1023 both performing to the same memory location. This functionality
1024 is not correctly implemented in PL310 as clean lines are not
1025 invalidated as a result of these operations. Note that this errata
1026 uses Texas Instrument's secure monitor api.
1029 source "arch/arm/common/Kconfig"
1031 config FORCE_MAX_ZONEORDER
1044 Find out whether you have ISA slots on your motherboard. ISA is the
1045 name of a bus system, i.e. the way the CPU talks to the other stuff
1046 inside your box. Other bus systems are PCI, EISA, MicroChannel
1047 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1048 newer boards don't support it. If you have ISA, say Y, otherwise N.
1050 # Select ISA DMA controller support
1055 # Select ISA DMA interface
1060 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1062 Find out whether you have a PCI motherboard. PCI is the name of a
1063 bus system, i.e. the way the CPU talks to the other stuff inside
1064 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1065 VESA. If you have PCI, say Y, otherwise N.
1074 # Select the host bridge type
1075 config PCI_HOST_VIA82C505
1077 depends on PCI && ARCH_SHARK
1080 config PCI_HOST_ITE8152
1082 depends on PCI && MACH_ARMCORE
1086 source "drivers/pci/Kconfig"
1088 source "drivers/pcmcia/Kconfig"
1092 menu "Kernel Features"
1094 source "kernel/time/Kconfig"
1097 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1098 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1099 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1100 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1101 depends on GENERIC_CLOCKEVENTS
1102 select USE_GENERIC_SMP_HELPERS
1103 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1105 This enables support for systems with more than one CPU. If you have
1106 a system with only one CPU, like most personal computers, say N. If
1107 you have a system with more than one CPU, say Y.
1109 If you say N here, the kernel will run on single and multiprocessor
1110 machines, but will use only one CPU of a multiprocessor machine. If
1111 you say Y here, the kernel will run on many, but not all, single
1112 processor machines. On a single processor machine, the kernel will
1113 run faster if you say N here.
1115 See also <file:Documentation/i386/IO-APIC.txt>,
1116 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1117 <http://www.linuxdoc.org/docs.html#howto>.
1119 If you don't know what to do here, say N.
1125 This option enables support for the ARM system coherency unit
1131 This options enables support for the ARM timer and watchdog unit
1134 prompt "Memory split"
1137 Select the desired split between kernel and user memory.
1139 If you are not absolutely sure what you are doing, leave this
1143 bool "3G/1G user/kernel split"
1145 bool "2G/2G user/kernel split"
1147 bool "1G/3G user/kernel split"
1152 default 0x40000000 if VMSPLIT_1G
1153 default 0x80000000 if VMSPLIT_2G
1157 int "Maximum number of CPUs (2-32)"
1163 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1164 depends on SMP && HOTPLUG && EXPERIMENTAL
1166 Say Y here to experiment with turning CPUs off and on. CPUs
1167 can be controlled through /sys/devices/system/cpu.
1170 bool "Use local timer interrupts"
1171 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1172 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1174 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1176 Enable support for local timers on SMP platforms, rather then the
1177 legacy IPI broadcast method. Local timers allows the system
1178 accounting to be spread across the timer interval, preventing a
1179 "thundering herd" at every timer tick.
1181 source kernel/Kconfig.preempt
1185 default 128 if ARCH_L7200
1186 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1187 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1188 default AT91_TIMER_HZ if ARCH_AT91
1191 config THUMB2_KERNEL
1192 bool "Compile the kernel in Thumb-2 mode"
1193 depends on CPU_V7 && EXPERIMENTAL
1195 select ARM_ASM_UNIFIED
1197 By enabling this option, the kernel will be compiled in
1198 Thumb-2 mode. A compiler/assembler that understand the unified
1199 ARM-Thumb syntax is needed.
1203 config ARM_ASM_UNIFIED
1207 bool "Use the ARM EABI to compile the kernel"
1209 This option allows for the kernel to be compiled using the latest
1210 ARM ABI (aka EABI). This is only useful if you are using a user
1211 space environment that is also compiled with EABI.
1213 Since there are major incompatibilities between the legacy ABI and
1214 EABI, especially with regard to structure member alignment, this
1215 option also changes the kernel syscall calling convention to
1216 disambiguate both ABIs and allow for backward compatibility support
1217 (selected with CONFIG_OABI_COMPAT).
1219 To use this you need GCC version 4.0.0 or later.
1222 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1223 depends on AEABI && EXPERIMENTAL
1226 This option preserves the old syscall interface along with the
1227 new (ARM EABI) one. It also provides a compatibility layer to
1228 intercept syscalls that have structure arguments which layout
1229 in memory differs between the legacy ABI and the new ARM EABI
1230 (only for non "thumb" binaries). This option adds a tiny
1231 overhead to all syscalls and produces a slightly larger kernel.
1232 If you know you'll be using only pure EABI user space then you
1233 can say N here. If this option is not selected and you attempt
1234 to execute a legacy ABI binary then the result will be
1235 UNPREDICTABLE (in fact it can be predicted that it won't work
1236 at all). If in doubt say Y.
1238 config ARCH_HAS_HOLES_MEMORYMODEL
1241 # Discontigmem is deprecated
1242 config ARCH_DISCONTIGMEM_ENABLE
1245 config ARCH_SPARSEMEM_ENABLE
1248 config ARCH_SPARSEMEM_DEFAULT
1249 def_bool ARCH_SPARSEMEM_ENABLE
1251 config ARCH_SELECT_MEMORY_MODEL
1252 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1256 default "4" if ARCH_LH7A40X
1258 depends on NEED_MULTIPLE_NODES
1261 bool "High Memory Support (EXPERIMENTAL)"
1262 depends on MMU && EXPERIMENTAL
1264 The address space of ARM processors is only 4 Gigabytes large
1265 and it has to accommodate user address space, kernel address
1266 space as well as some memory mapped IO. That means that, if you
1267 have a large amount of physical memory and/or IO, not all of the
1268 memory can be "permanently mapped" by the kernel. The physical
1269 memory that is not permanently mapped is called "high memory".
1271 Depending on the selected kernel/user memory split, minimum
1272 vmalloc space and actual amount of RAM, you may not need this
1273 option which should result in a slightly faster kernel.
1278 bool "Allocate 2nd-level pagetables from highmem"
1280 depends on !OUTER_CACHE
1282 config HW_PERF_EVENTS
1283 bool "Enable hardware performance counter support for perf events"
1284 depends on PERF_EVENTS && CPU_HAS_PMU
1287 Enable hardware performance counter support for perf events. If
1288 disabled, perf events will use software events only.
1293 bool "Timer and CPU usage LEDs"
1294 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1295 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1296 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1297 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1298 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1299 ARCH_AT91 || ARCH_DAVINCI || \
1300 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1302 If you say Y here, the LEDs on your machine will be used
1303 to provide useful information about your current system status.
1305 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1306 be able to select which LEDs are active using the options below. If
1307 you are compiling a kernel for the EBSA-110 or the LART however, the
1308 red LED will simply flash regularly to indicate that the system is
1309 still functional. It is safe to say Y here if you have a CATS
1310 system, but the driver will do nothing.
1313 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1314 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1315 || MACH_OMAP_PERSEUS2
1317 depends on !GENERIC_CLOCKEVENTS
1318 default y if ARCH_EBSA110
1320 If you say Y here, one of the system LEDs (the green one on the
1321 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1322 will flash regularly to indicate that the system is still
1323 operational. This is mainly useful to kernel hackers who are
1324 debugging unstable kernels.
1326 The LART uses the same LED for both Timer LED and CPU usage LED
1327 functions. You may choose to use both, but the Timer LED function
1328 will overrule the CPU usage LED.
1331 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1333 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1334 || MACH_OMAP_PERSEUS2
1337 If you say Y here, the red LED will be used to give a good real
1338 time indication of CPU usage, by lighting whenever the idle task
1339 is not currently executing.
1341 The LART uses the same LED for both Timer LED and CPU usage LED
1342 functions. You may choose to use both, but the Timer LED function
1343 will overrule the CPU usage LED.
1345 config ALIGNMENT_TRAP
1347 depends on CPU_CP15_MMU
1348 default y if !ARCH_EBSA110
1349 select HAVE_PROC_CPU if PROC_FS
1351 ARM processors cannot fetch/store information which is not
1352 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1353 address divisible by 4. On 32-bit ARM processors, these non-aligned
1354 fetch/store instructions will be emulated in software if you say
1355 here, which has a severe performance impact. This is necessary for
1356 correct operation of some network protocols. With an IP-only
1357 configuration it is safe to say N, otherwise say Y.
1359 config UACCESS_WITH_MEMCPY
1360 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1361 depends on MMU && EXPERIMENTAL
1362 default y if CPU_FEROCEON
1364 Implement faster copy_to_user and clear_user methods for CPU
1365 cores where a 8-word STM instruction give significantly higher
1366 memory write throughput than a sequence of individual 32bit stores.
1368 A possible side effect is a slight increase in scheduling latency
1369 between threads sharing the same address space if they invoke
1370 such copy operations with large buffers.
1372 However, if the CPU data cache is using a write-allocate mode,
1373 this option is unlikely to provide any performance gain.
1379 # Compressed boot loader in ROM. Yes, we really want to ask about
1380 # TEXT and BSS so we preserve their values in the config files.
1381 config ZBOOT_ROM_TEXT
1382 hex "Compressed ROM boot loader base address"
1385 The physical address at which the ROM-able zImage is to be
1386 placed in the target. Platforms which normally make use of
1387 ROM-able zImage formats normally set this to a suitable
1388 value in their defconfig file.
1390 If ZBOOT_ROM is not enabled, this has no effect.
1392 config ZBOOT_ROM_BSS
1393 hex "Compressed ROM boot loader BSS address"
1396 The base address of an area of read/write memory in the target
1397 for the ROM-able zImage which must be available while the
1398 decompressor is running. It must be large enough to hold the
1399 entire decompressed kernel plus an additional 128 KiB.
1400 Platforms which normally make use of ROM-able zImage formats
1401 normally set this to a suitable value in their defconfig file.
1403 If ZBOOT_ROM is not enabled, this has no effect.
1406 bool "Compressed boot loader in ROM/flash"
1407 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1409 Say Y here if you intend to execute your compressed kernel image
1410 (zImage) directly from ROM or flash. If unsure, say N.
1413 string "Default kernel command string"
1416 On some architectures (EBSA110 and CATS), there is currently no way
1417 for the boot loader to pass arguments to the kernel. For these
1418 architectures, you should supply some command-line options at build
1419 time by entering them here. As a minimum, you should specify the
1420 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1423 bool "Kernel Execute-In-Place from ROM"
1424 depends on !ZBOOT_ROM
1426 Execute-In-Place allows the kernel to run from non-volatile storage
1427 directly addressable by the CPU, such as NOR flash. This saves RAM
1428 space since the text section of the kernel is not loaded from flash
1429 to RAM. Read-write sections, such as the data section and stack,
1430 are still copied to RAM. The XIP kernel is not compressed since
1431 it has to run directly from flash, so it will take more space to
1432 store it. The flash address used to link the kernel object files,
1433 and for storing it, is configuration dependent. Therefore, if you
1434 say Y here, you must know the proper physical address where to
1435 store the kernel image depending on your own flash memory usage.
1437 Also note that the make target becomes "make xipImage" rather than
1438 "make zImage" or "make Image". The final kernel binary to put in
1439 ROM memory will be arch/arm/boot/xipImage.
1443 config XIP_PHYS_ADDR
1444 hex "XIP Kernel Physical Location"
1445 depends on XIP_KERNEL
1446 default "0x00080000"
1448 This is the physical address in your flash memory the kernel will
1449 be linked for and stored to. This address is dependent on your
1453 bool "Kexec system call (EXPERIMENTAL)"
1454 depends on EXPERIMENTAL
1456 kexec is a system call that implements the ability to shutdown your
1457 current kernel, and to start another kernel. It is like a reboot
1458 but it is independent of the system firmware. And like a reboot
1459 you can start any kernel with it, not just Linux.
1461 It is an ongoing process to be certain the hardware in a machine
1462 is properly shutdown, so do not be surprised if this code does not
1463 initially work for you. It may help to enable device hotplugging
1467 bool "Export atags in procfs"
1471 Should the atags used to boot the kernel be exported in an "atags"
1472 file in procfs. Useful with kexec.
1476 menu "CPU Power Management"
1480 source "drivers/cpufreq/Kconfig"
1482 config CPU_FREQ_SA1100
1485 config CPU_FREQ_SA1110
1488 config CPU_FREQ_INTEGRATOR
1489 tristate "CPUfreq driver for ARM Integrator CPUs"
1490 depends on ARCH_INTEGRATOR && CPU_FREQ
1493 This enables the CPUfreq driver for ARM Integrator CPUs.
1495 For details, take a look at <file:Documentation/cpu-freq>.
1501 depends on CPU_FREQ && ARCH_PXA && PXA25x
1503 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1505 config CPU_FREQ_S3C64XX
1506 bool "CPUfreq support for Samsung S3C64XX CPUs"
1507 depends on CPU_FREQ && CPU_S3C6410
1512 Internal configuration node for common cpufreq on Samsung SoC
1514 config CPU_FREQ_S3C24XX
1515 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1516 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1519 This enables the CPUfreq driver for the Samsung S3C24XX family
1522 For details, take a look at <file:Documentation/cpu-freq>.
1526 config CPU_FREQ_S3C24XX_PLL
1527 bool "Support CPUfreq changing of PLL frequency"
1528 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1530 Compile in support for changing the PLL frequency from the
1531 S3C24XX series CPUfreq driver. The PLL takes time to settle
1532 after a frequency change, so by default it is not enabled.
1534 This also means that the PLL tables for the selected CPU(s) will
1535 be built which may increase the size of the kernel image.
1537 config CPU_FREQ_S3C24XX_DEBUG
1538 bool "Debug CPUfreq Samsung driver core"
1539 depends on CPU_FREQ_S3C24XX
1541 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1543 config CPU_FREQ_S3C24XX_IODEBUG
1544 bool "Debug CPUfreq Samsung driver IO timing"
1545 depends on CPU_FREQ_S3C24XX
1547 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1549 config CPU_FREQ_S3C24XX_DEBUGFS
1550 bool "Export debugfs for CPUFreq"
1551 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1553 Export status information via debugfs.
1557 source "drivers/cpuidle/Kconfig"
1561 menu "Floating point emulation"
1563 comment "At least one emulation must be selected"
1566 bool "NWFPE math emulation"
1567 depends on !AEABI || OABI_COMPAT
1569 Say Y to include the NWFPE floating point emulator in the kernel.
1570 This is necessary to run most binaries. Linux does not currently
1571 support floating point hardware so you need to say Y here even if
1572 your machine has an FPA or floating point co-processor podule.
1574 You may say N here if you are going to load the Acorn FPEmulator
1575 early in the bootup.
1578 bool "Support extended precision"
1579 depends on FPE_NWFPE
1581 Say Y to include 80-bit support in the kernel floating-point
1582 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1583 Note that gcc does not generate 80-bit operations by default,
1584 so in most cases this option only enlarges the size of the
1585 floating point emulator without any good reason.
1587 You almost surely want to say N here.
1590 bool "FastFPE math emulation (EXPERIMENTAL)"
1591 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1593 Say Y here to include the FAST floating point emulator in the kernel.
1594 This is an experimental much faster emulator which now also has full
1595 precision for the mantissa. It does not support any exceptions.
1596 It is very simple, and approximately 3-6 times faster than NWFPE.
1598 It should be sufficient for most programs. It may be not suitable
1599 for scientific calculations, but you have to check this for yourself.
1600 If you do not feel you need a faster FP emulation you should better
1604 bool "VFP-format floating point maths"
1605 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1607 Say Y to include VFP support code in the kernel. This is needed
1608 if your hardware includes a VFP unit.
1610 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1611 release notes and additional status information.
1613 Say N if your target does not have VFP hardware.
1621 bool "Advanced SIMD (NEON) Extension support"
1622 depends on VFPv3 && CPU_V7
1624 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1629 menu "Userspace binary formats"
1631 source "fs/Kconfig.binfmt"
1634 tristate "RISC OS personality"
1637 Say Y here to include the kernel code necessary if you want to run
1638 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1639 experimental; if this sounds frightening, say N and sleep in peace.
1640 You can also say M here to compile this support as a module (which
1641 will be called arthur).
1645 menu "Power management options"
1647 source "kernel/power/Kconfig"
1649 config ARCH_SUSPEND_POSSIBLE
1654 source "net/Kconfig"
1656 source "drivers/Kconfig"
1660 source "arch/arm/Kconfig.debug"
1662 source "security/Kconfig"
1664 source "crypto/Kconfig"
1666 source "lib/Kconfig"