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.
445 select ARCH_REQUIRE_GPIOLIB
446 select GENERIC_CLOCKEVENTS
449 Support for the Marvell Dove SoC 88AP510
452 bool "Marvell Kirkwood"
455 select ARCH_REQUIRE_GPIOLIB
456 select GENERIC_CLOCKEVENTS
459 Support for the following Marvell Kirkwood series SoCs:
460 88F6180, 88F6192 and 88F6281.
463 bool "Marvell Loki (88RC8480)"
465 select GENERIC_CLOCKEVENTS
468 Support for the Marvell Loki (88RC8480) SoC.
471 bool "Marvell MV78xx0"
474 select ARCH_REQUIRE_GPIOLIB
475 select GENERIC_CLOCKEVENTS
478 Support for the following Marvell MV78xx0 series SoCs:
486 select ARCH_REQUIRE_GPIOLIB
487 select GENERIC_CLOCKEVENTS
490 Support for the following Marvell Orion 5x series SoCs:
491 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
492 Orion-2 (5281), Orion-1-90 (6183).
495 bool "Marvell PXA168/910/MMP2"
497 select ARCH_REQUIRE_GPIOLIB
499 select GENERIC_CLOCKEVENTS
503 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
506 bool "Micrel/Kendin KS8695"
508 select ARCH_REQUIRE_GPIOLIB
509 select ARCH_USES_GETTIMEOFFSET
511 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
512 System-on-Chip devices.
515 bool "NetSilicon NS9xxx"
518 select GENERIC_CLOCKEVENTS
521 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
524 <http://www.digi.com/products/microprocessors/index.jsp>
527 bool "Nuvoton W90X900 CPU"
529 select ARCH_REQUIRE_GPIOLIB
531 select GENERIC_CLOCKEVENTS
533 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
534 At present, the w90x900 has been renamed nuc900, regarding
535 the ARM series product line, you can login the following
536 link address to know more.
538 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
539 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
542 bool "Nuvoton NUC93X CPU"
546 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
547 low-power and high performance MPEG-4/JPEG multimedia controller chip.
550 bool "Philips Nexperia PNX4008 Mobile"
553 select ARCH_USES_GETTIMEOFFSET
555 This enables support for Philips PNX4008 mobile platform.
558 bool "PXA2xx/PXA3xx-based"
561 select ARCH_HAS_CPUFREQ
563 select ARCH_REQUIRE_GPIOLIB
564 select GENERIC_CLOCKEVENTS
568 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
573 select GENERIC_CLOCKEVENTS
575 Support for Qualcomm MSM/QSD based systems. This runs on the
576 apps processor of the MSM/QSD and depends on a shared memory
577 interface to the modem processor which runs the baseband
578 stack and controls some vital subsystems
579 (clock and power control, etc).
582 bool "Renesas SH-Mobile"
584 Support for Renesas's SH-Mobile ARM platforms
591 select ARCH_MAY_HAVE_PC_FDC
592 select HAVE_PATA_PLATFORM
595 select ARCH_SPARSEMEM_ENABLE
596 select ARCH_USES_GETTIMEOFFSET
598 On the Acorn Risc-PC, Linux can support the internal IDE disk and
599 CD-ROM interface, serial and parallel port, and the floppy drive.
605 select ARCH_SPARSEMEM_ENABLE
607 select ARCH_HAS_CPUFREQ
609 select GENERIC_CLOCKEVENTS
612 select ARCH_REQUIRE_GPIOLIB
614 Support for StrongARM 11x0 based boards.
617 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
619 select ARCH_HAS_CPUFREQ
621 select ARCH_USES_GETTIMEOFFSET
623 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
624 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
625 the Samsung SMDK2410 development board (and derivatives).
627 Note, the S3C2416 and the S3C2450 are so close that they even share
628 the same SoC ID code. This means that there is no seperate machine
629 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
632 bool "Samsung S3C64XX"
638 select ARCH_USES_GETTIMEOFFSET
639 select ARCH_HAS_CPUFREQ
640 select ARCH_REQUIRE_GPIOLIB
641 select SAMSUNG_CLKSRC
642 select SAMSUNG_IRQ_VIC_TIMER
643 select SAMSUNG_IRQ_UART
644 select S3C_GPIO_TRACK
645 select S3C_GPIO_PULL_UPDOWN
646 select S3C_GPIO_CFG_S3C24XX
647 select S3C_GPIO_CFG_S3C64XX
649 select USB_ARCH_HAS_OHCI
650 select SAMSUNG_GPIOLIB_4BIT
652 Samsung S3C64XX series based systems
655 bool "Samsung S5P6440"
659 select ARCH_USES_GETTIMEOFFSET
661 Samsung S5P6440 CPU based systems
664 bool "Samsung S5P6442"
668 select ARCH_USES_GETTIMEOFFSET
670 Samsung S5P6442 CPU based systems
673 bool "Samsung S5PC100"
677 select ARM_L1_CACHE_SHIFT_6
678 select ARCH_USES_GETTIMEOFFSET
680 Samsung S5PC100 series based systems
683 bool "Samsung S5PV210/S5PC110"
687 select ARM_L1_CACHE_SHIFT_6
688 select ARCH_USES_GETTIMEOFFSET
690 Samsung S5PV210/S5PC110 series based systems
699 select ARCH_USES_GETTIMEOFFSET
701 Support for the StrongARM based Digital DNARD machine, also known
702 as "Shark" (<http://www.shark-linux.de/shark.html>).
707 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
708 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
709 select ARCH_USES_GETTIMEOFFSET
711 Say Y here for systems based on one of the Sharp LH7A40X
712 System on a Chip processors. These CPUs include an ARM922T
713 core with a wide array of integrated devices for
714 hand-held and low-power applications.
717 bool "ST-Ericsson U300 Series"
723 select GENERIC_CLOCKEVENTS
727 Support for ST-Ericsson U300 series mobile platforms.
730 bool "ST-Ericsson U8500 Series"
733 select GENERIC_CLOCKEVENTS
735 select ARCH_REQUIRE_GPIOLIB
737 Support for ST-Ericsson's Ux500 architecture
740 bool "STMicroelectronics Nomadik"
745 select GENERIC_CLOCKEVENTS
746 select ARCH_REQUIRE_GPIOLIB
748 Support for the Nomadik platform by ST-Ericsson
752 select GENERIC_CLOCKEVENTS
753 select ARCH_REQUIRE_GPIOLIB
757 select GENERIC_ALLOCATOR
758 select ARCH_HAS_HOLES_MEMORYMODEL
760 Support for TI's DaVinci platform.
765 select ARCH_REQUIRE_GPIOLIB
766 select ARCH_HAS_CPUFREQ
767 select GENERIC_CLOCKEVENTS
768 select ARCH_HAS_HOLES_MEMORYMODEL
770 Support for TI's OMAP platform (OMAP1 and OMAP2).
775 select ARCH_REQUIRE_GPIOLIB
777 select GENERIC_CLOCKEVENTS
780 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
785 # This is sorted alphabetically by mach-* pathname. However, plat-*
786 # Kconfigs may be included either alphabetically (according to the
787 # plat- suffix) or along side the corresponding mach-* source.
789 source "arch/arm/mach-aaec2000/Kconfig"
791 source "arch/arm/mach-at91/Kconfig"
793 source "arch/arm/mach-bcmring/Kconfig"
795 source "arch/arm/mach-clps711x/Kconfig"
797 source "arch/arm/mach-cns3xxx/Kconfig"
799 source "arch/arm/mach-davinci/Kconfig"
801 source "arch/arm/mach-dove/Kconfig"
803 source "arch/arm/mach-ep93xx/Kconfig"
805 source "arch/arm/mach-footbridge/Kconfig"
807 source "arch/arm/mach-gemini/Kconfig"
809 source "arch/arm/mach-h720x/Kconfig"
811 source "arch/arm/mach-integrator/Kconfig"
813 source "arch/arm/mach-iop32x/Kconfig"
815 source "arch/arm/mach-iop33x/Kconfig"
817 source "arch/arm/mach-iop13xx/Kconfig"
819 source "arch/arm/mach-ixp4xx/Kconfig"
821 source "arch/arm/mach-ixp2000/Kconfig"
823 source "arch/arm/mach-ixp23xx/Kconfig"
825 source "arch/arm/mach-kirkwood/Kconfig"
827 source "arch/arm/mach-ks8695/Kconfig"
829 source "arch/arm/mach-lh7a40x/Kconfig"
831 source "arch/arm/mach-loki/Kconfig"
833 source "arch/arm/mach-msm/Kconfig"
835 source "arch/arm/mach-mv78xx0/Kconfig"
837 source "arch/arm/plat-mxc/Kconfig"
839 source "arch/arm/mach-netx/Kconfig"
841 source "arch/arm/mach-nomadik/Kconfig"
842 source "arch/arm/plat-nomadik/Kconfig"
844 source "arch/arm/mach-ns9xxx/Kconfig"
846 source "arch/arm/mach-nuc93x/Kconfig"
848 source "arch/arm/plat-omap/Kconfig"
850 source "arch/arm/mach-omap1/Kconfig"
852 source "arch/arm/mach-omap2/Kconfig"
854 source "arch/arm/mach-orion5x/Kconfig"
856 source "arch/arm/mach-pxa/Kconfig"
857 source "arch/arm/plat-pxa/Kconfig"
859 source "arch/arm/mach-mmp/Kconfig"
861 source "arch/arm/mach-realview/Kconfig"
863 source "arch/arm/mach-sa1100/Kconfig"
865 source "arch/arm/plat-samsung/Kconfig"
866 source "arch/arm/plat-s3c24xx/Kconfig"
867 source "arch/arm/plat-s5p/Kconfig"
869 source "arch/arm/plat-spear/Kconfig"
872 source "arch/arm/mach-s3c2400/Kconfig"
873 source "arch/arm/mach-s3c2410/Kconfig"
874 source "arch/arm/mach-s3c2412/Kconfig"
875 source "arch/arm/mach-s3c2416/Kconfig"
876 source "arch/arm/mach-s3c2440/Kconfig"
877 source "arch/arm/mach-s3c2443/Kconfig"
881 source "arch/arm/mach-s3c64xx/Kconfig"
884 source "arch/arm/mach-s5p6440/Kconfig"
886 source "arch/arm/mach-s5p6442/Kconfig"
888 source "arch/arm/mach-s5pc100/Kconfig"
890 source "arch/arm/mach-s5pv210/Kconfig"
892 source "arch/arm/mach-shmobile/Kconfig"
894 source "arch/arm/plat-stmp3xxx/Kconfig"
896 source "arch/arm/mach-u300/Kconfig"
898 source "arch/arm/mach-ux500/Kconfig"
900 source "arch/arm/mach-versatile/Kconfig"
902 source "arch/arm/mach-vexpress/Kconfig"
904 source "arch/arm/mach-w90x900/Kconfig"
906 # Definitions to make life easier
912 select GENERIC_CLOCKEVENTS
920 config PLAT_VERSATILE
923 config ARM_TIMER_SP804
926 source arch/arm/mm/Kconfig
929 bool "Enable iWMMXt support"
930 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
931 default y if PXA27x || PXA3xx || ARCH_MMP
933 Enable support for iWMMXt context switching at run time if
934 running on a CPU that supports it.
936 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
939 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
943 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
944 (!ARCH_OMAP3 || OMAP3_EMU)
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.
1062 # Select the host bridge type
1063 config PCI_HOST_VIA82C505
1065 depends on PCI && ARCH_SHARK
1068 config PCI_HOST_ITE8152
1070 depends on PCI && MACH_ARMCORE
1074 source "drivers/pci/Kconfig"
1076 source "drivers/pcmcia/Kconfig"
1080 menu "Kernel Features"
1082 source "kernel/time/Kconfig"
1085 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1086 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1087 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1088 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1089 depends on GENERIC_CLOCKEVENTS
1090 select USE_GENERIC_SMP_HELPERS
1091 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1093 This enables support for systems with more than one CPU. If you have
1094 a system with only one CPU, like most personal computers, say N. If
1095 you have a system with more than one CPU, say Y.
1097 If you say N here, the kernel will run on single and multiprocessor
1098 machines, but will use only one CPU of a multiprocessor machine. If
1099 you say Y here, the kernel will run on many, but not all, single
1100 processor machines. On a single processor machine, the kernel will
1101 run faster if you say N here.
1103 See also <file:Documentation/i386/IO-APIC.txt>,
1104 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1105 <http://www.linuxdoc.org/docs.html#howto>.
1107 If you don't know what to do here, say N.
1113 This option enables support for the ARM system coherency unit
1119 This options enables support for the ARM timer and watchdog unit
1122 prompt "Memory split"
1125 Select the desired split between kernel and user memory.
1127 If you are not absolutely sure what you are doing, leave this
1131 bool "3G/1G user/kernel split"
1133 bool "2G/2G user/kernel split"
1135 bool "1G/3G user/kernel split"
1140 default 0x40000000 if VMSPLIT_1G
1141 default 0x80000000 if VMSPLIT_2G
1145 int "Maximum number of CPUs (2-32)"
1151 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1152 depends on SMP && HOTPLUG && EXPERIMENTAL
1154 Say Y here to experiment with turning CPUs off and on. CPUs
1155 can be controlled through /sys/devices/system/cpu.
1158 bool "Use local timer interrupts"
1159 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1160 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1162 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1164 Enable support for local timers on SMP platforms, rather then the
1165 legacy IPI broadcast method. Local timers allows the system
1166 accounting to be spread across the timer interval, preventing a
1167 "thundering herd" at every timer tick.
1169 source kernel/Kconfig.preempt
1173 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1174 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1175 default AT91_TIMER_HZ if ARCH_AT91
1178 config THUMB2_KERNEL
1179 bool "Compile the kernel in Thumb-2 mode"
1180 depends on CPU_V7 && EXPERIMENTAL
1182 select ARM_ASM_UNIFIED
1184 By enabling this option, the kernel will be compiled in
1185 Thumb-2 mode. A compiler/assembler that understand the unified
1186 ARM-Thumb syntax is needed.
1190 config ARM_ASM_UNIFIED
1194 bool "Use the ARM EABI to compile the kernel"
1196 This option allows for the kernel to be compiled using the latest
1197 ARM ABI (aka EABI). This is only useful if you are using a user
1198 space environment that is also compiled with EABI.
1200 Since there are major incompatibilities between the legacy ABI and
1201 EABI, especially with regard to structure member alignment, this
1202 option also changes the kernel syscall calling convention to
1203 disambiguate both ABIs and allow for backward compatibility support
1204 (selected with CONFIG_OABI_COMPAT).
1206 To use this you need GCC version 4.0.0 or later.
1209 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1210 depends on AEABI && EXPERIMENTAL
1213 This option preserves the old syscall interface along with the
1214 new (ARM EABI) one. It also provides a compatibility layer to
1215 intercept syscalls that have structure arguments which layout
1216 in memory differs between the legacy ABI and the new ARM EABI
1217 (only for non "thumb" binaries). This option adds a tiny
1218 overhead to all syscalls and produces a slightly larger kernel.
1219 If you know you'll be using only pure EABI user space then you
1220 can say N here. If this option is not selected and you attempt
1221 to execute a legacy ABI binary then the result will be
1222 UNPREDICTABLE (in fact it can be predicted that it won't work
1223 at all). If in doubt say Y.
1225 config ARCH_HAS_HOLES_MEMORYMODEL
1228 # Discontigmem is deprecated
1229 config ARCH_DISCONTIGMEM_ENABLE
1232 config ARCH_SPARSEMEM_ENABLE
1235 config ARCH_SPARSEMEM_DEFAULT
1236 def_bool ARCH_SPARSEMEM_ENABLE
1238 config ARCH_SELECT_MEMORY_MODEL
1239 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1243 default "4" if ARCH_LH7A40X
1245 depends on NEED_MULTIPLE_NODES
1248 bool "High Memory Support (EXPERIMENTAL)"
1249 depends on MMU && EXPERIMENTAL
1251 The address space of ARM processors is only 4 Gigabytes large
1252 and it has to accommodate user address space, kernel address
1253 space as well as some memory mapped IO. That means that, if you
1254 have a large amount of physical memory and/or IO, not all of the
1255 memory can be "permanently mapped" by the kernel. The physical
1256 memory that is not permanently mapped is called "high memory".
1258 Depending on the selected kernel/user memory split, minimum
1259 vmalloc space and actual amount of RAM, you may not need this
1260 option which should result in a slightly faster kernel.
1265 bool "Allocate 2nd-level pagetables from highmem"
1267 depends on !OUTER_CACHE
1269 config HW_PERF_EVENTS
1270 bool "Enable hardware performance counter support for perf events"
1271 depends on PERF_EVENTS && CPU_HAS_PMU
1274 Enable hardware performance counter support for perf events. If
1275 disabled, perf events will use software events only.
1280 bool "Timer and CPU usage LEDs"
1281 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1282 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1283 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1284 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1285 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1286 ARCH_AT91 || ARCH_DAVINCI || \
1287 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1289 If you say Y here, the LEDs on your machine will be used
1290 to provide useful information about your current system status.
1292 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1293 be able to select which LEDs are active using the options below. If
1294 you are compiling a kernel for the EBSA-110 or the LART however, the
1295 red LED will simply flash regularly to indicate that the system is
1296 still functional. It is safe to say Y here if you have a CATS
1297 system, but the driver will do nothing.
1300 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1301 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1302 || MACH_OMAP_PERSEUS2
1304 depends on !GENERIC_CLOCKEVENTS
1305 default y if ARCH_EBSA110
1307 If you say Y here, one of the system LEDs (the green one on the
1308 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1309 will flash regularly to indicate that the system is still
1310 operational. This is mainly useful to kernel hackers who are
1311 debugging unstable kernels.
1313 The LART uses the same LED for both Timer LED and CPU usage LED
1314 functions. You may choose to use both, but the Timer LED function
1315 will overrule the CPU usage LED.
1318 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1320 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1321 || MACH_OMAP_PERSEUS2
1324 If you say Y here, the red LED will be used to give a good real
1325 time indication of CPU usage, by lighting whenever the idle task
1326 is not currently executing.
1328 The LART uses the same LED for both Timer LED and CPU usage LED
1329 functions. You may choose to use both, but the Timer LED function
1330 will overrule the CPU usage LED.
1332 config ALIGNMENT_TRAP
1334 depends on CPU_CP15_MMU
1335 default y if !ARCH_EBSA110
1336 select HAVE_PROC_CPU if PROC_FS
1338 ARM processors cannot fetch/store information which is not
1339 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1340 address divisible by 4. On 32-bit ARM processors, these non-aligned
1341 fetch/store instructions will be emulated in software if you say
1342 here, which has a severe performance impact. This is necessary for
1343 correct operation of some network protocols. With an IP-only
1344 configuration it is safe to say N, otherwise say Y.
1346 config UACCESS_WITH_MEMCPY
1347 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1348 depends on MMU && EXPERIMENTAL
1349 default y if CPU_FEROCEON
1351 Implement faster copy_to_user and clear_user methods for CPU
1352 cores where a 8-word STM instruction give significantly higher
1353 memory write throughput than a sequence of individual 32bit stores.
1355 A possible side effect is a slight increase in scheduling latency
1356 between threads sharing the same address space if they invoke
1357 such copy operations with large buffers.
1359 However, if the CPU data cache is using a write-allocate mode,
1360 this option is unlikely to provide any performance gain.
1366 # Compressed boot loader in ROM. Yes, we really want to ask about
1367 # TEXT and BSS so we preserve their values in the config files.
1368 config ZBOOT_ROM_TEXT
1369 hex "Compressed ROM boot loader base address"
1372 The physical address at which the ROM-able zImage is to be
1373 placed in the target. Platforms which normally make use of
1374 ROM-able zImage formats normally set this to a suitable
1375 value in their defconfig file.
1377 If ZBOOT_ROM is not enabled, this has no effect.
1379 config ZBOOT_ROM_BSS
1380 hex "Compressed ROM boot loader BSS address"
1383 The base address of an area of read/write memory in the target
1384 for the ROM-able zImage which must be available while the
1385 decompressor is running. It must be large enough to hold the
1386 entire decompressed kernel plus an additional 128 KiB.
1387 Platforms which normally make use of ROM-able zImage formats
1388 normally set this to a suitable value in their defconfig file.
1390 If ZBOOT_ROM is not enabled, this has no effect.
1393 bool "Compressed boot loader in ROM/flash"
1394 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1396 Say Y here if you intend to execute your compressed kernel image
1397 (zImage) directly from ROM or flash. If unsure, say N.
1400 string "Default kernel command string"
1403 On some architectures (EBSA110 and CATS), there is currently no way
1404 for the boot loader to pass arguments to the kernel. For these
1405 architectures, you should supply some command-line options at build
1406 time by entering them here. As a minimum, you should specify the
1407 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1409 config CMDLINE_FORCE
1410 bool "Always use the default kernel command string"
1411 depends on CMDLINE != ""
1413 Always use the default kernel command string, even if the boot
1414 loader passes other arguments to the kernel.
1415 This is useful if you cannot or don't want to change the
1416 command-line options your boot loader passes to the kernel.
1421 bool "Kernel Execute-In-Place from ROM"
1422 depends on !ZBOOT_ROM
1424 Execute-In-Place allows the kernel to run from non-volatile storage
1425 directly addressable by the CPU, such as NOR flash. This saves RAM
1426 space since the text section of the kernel is not loaded from flash
1427 to RAM. Read-write sections, such as the data section and stack,
1428 are still copied to RAM. The XIP kernel is not compressed since
1429 it has to run directly from flash, so it will take more space to
1430 store it. The flash address used to link the kernel object files,
1431 and for storing it, is configuration dependent. Therefore, if you
1432 say Y here, you must know the proper physical address where to
1433 store the kernel image depending on your own flash memory usage.
1435 Also note that the make target becomes "make xipImage" rather than
1436 "make zImage" or "make Image". The final kernel binary to put in
1437 ROM memory will be arch/arm/boot/xipImage.
1441 config XIP_PHYS_ADDR
1442 hex "XIP Kernel Physical Location"
1443 depends on XIP_KERNEL
1444 default "0x00080000"
1446 This is the physical address in your flash memory the kernel will
1447 be linked for and stored to. This address is dependent on your
1451 bool "Kexec system call (EXPERIMENTAL)"
1452 depends on EXPERIMENTAL
1454 kexec is a system call that implements the ability to shutdown your
1455 current kernel, and to start another kernel. It is like a reboot
1456 but it is independent of the system firmware. And like a reboot
1457 you can start any kernel with it, not just Linux.
1459 It is an ongoing process to be certain the hardware in a machine
1460 is properly shutdown, so do not be surprised if this code does not
1461 initially work for you. It may help to enable device hotplugging
1465 bool "Export atags in procfs"
1469 Should the atags used to boot the kernel be exported in an "atags"
1470 file in procfs. Useful with kexec.
1474 menu "CPU Power Management"
1478 source "drivers/cpufreq/Kconfig"
1480 config CPU_FREQ_SA1100
1483 config CPU_FREQ_SA1110
1486 config CPU_FREQ_INTEGRATOR
1487 tristate "CPUfreq driver for ARM Integrator CPUs"
1488 depends on ARCH_INTEGRATOR && CPU_FREQ
1491 This enables the CPUfreq driver for ARM Integrator CPUs.
1493 For details, take a look at <file:Documentation/cpu-freq>.
1499 depends on CPU_FREQ && ARCH_PXA && PXA25x
1501 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1503 config CPU_FREQ_S3C64XX
1504 bool "CPUfreq support for Samsung S3C64XX CPUs"
1505 depends on CPU_FREQ && CPU_S3C6410
1510 Internal configuration node for common cpufreq on Samsung SoC
1512 config CPU_FREQ_S3C24XX
1513 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1514 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1517 This enables the CPUfreq driver for the Samsung S3C24XX family
1520 For details, take a look at <file:Documentation/cpu-freq>.
1524 config CPU_FREQ_S3C24XX_PLL
1525 bool "Support CPUfreq changing of PLL frequency"
1526 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1528 Compile in support for changing the PLL frequency from the
1529 S3C24XX series CPUfreq driver. The PLL takes time to settle
1530 after a frequency change, so by default it is not enabled.
1532 This also means that the PLL tables for the selected CPU(s) will
1533 be built which may increase the size of the kernel image.
1535 config CPU_FREQ_S3C24XX_DEBUG
1536 bool "Debug CPUfreq Samsung driver core"
1537 depends on CPU_FREQ_S3C24XX
1539 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1541 config CPU_FREQ_S3C24XX_IODEBUG
1542 bool "Debug CPUfreq Samsung driver IO timing"
1543 depends on CPU_FREQ_S3C24XX
1545 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1547 config CPU_FREQ_S3C24XX_DEBUGFS
1548 bool "Export debugfs for CPUFreq"
1549 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1551 Export status information via debugfs.
1555 source "drivers/cpuidle/Kconfig"
1559 menu "Floating point emulation"
1561 comment "At least one emulation must be selected"
1564 bool "NWFPE math emulation"
1565 depends on !AEABI || OABI_COMPAT
1567 Say Y to include the NWFPE floating point emulator in the kernel.
1568 This is necessary to run most binaries. Linux does not currently
1569 support floating point hardware so you need to say Y here even if
1570 your machine has an FPA or floating point co-processor podule.
1572 You may say N here if you are going to load the Acorn FPEmulator
1573 early in the bootup.
1576 bool "Support extended precision"
1577 depends on FPE_NWFPE
1579 Say Y to include 80-bit support in the kernel floating-point
1580 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1581 Note that gcc does not generate 80-bit operations by default,
1582 so in most cases this option only enlarges the size of the
1583 floating point emulator without any good reason.
1585 You almost surely want to say N here.
1588 bool "FastFPE math emulation (EXPERIMENTAL)"
1589 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1591 Say Y here to include the FAST floating point emulator in the kernel.
1592 This is an experimental much faster emulator which now also has full
1593 precision for the mantissa. It does not support any exceptions.
1594 It is very simple, and approximately 3-6 times faster than NWFPE.
1596 It should be sufficient for most programs. It may be not suitable
1597 for scientific calculations, but you have to check this for yourself.
1598 If you do not feel you need a faster FP emulation you should better
1602 bool "VFP-format floating point maths"
1603 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1605 Say Y to include VFP support code in the kernel. This is needed
1606 if your hardware includes a VFP unit.
1608 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1609 release notes and additional status information.
1611 Say N if your target does not have VFP hardware.
1619 bool "Advanced SIMD (NEON) Extension support"
1620 depends on VFPv3 && CPU_V7
1622 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1627 menu "Userspace binary formats"
1629 source "fs/Kconfig.binfmt"
1632 tristate "RISC OS personality"
1635 Say Y here to include the kernel code necessary if you want to run
1636 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1637 experimental; if this sounds frightening, say N and sleep in peace.
1638 You can also say M here to compile this support as a module (which
1639 will be called arthur).
1643 menu "Power management options"
1645 source "kernel/power/Kconfig"
1647 config ARCH_SUSPEND_POSSIBLE
1652 source "net/Kconfig"
1654 source "drivers/Kconfig"
1658 source "arch/arm/Kconfig.debug"
1660 source "security/Kconfig"
1662 source "crypto/Kconfig"
1664 source "lib/Kconfig"