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
948 source "arch/arm/Kconfig-nommu"
951 config ARM_ERRATA_411920
952 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
953 depends on CPU_V6 && !SMP
955 Invalidation of the Instruction Cache operation can
956 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
957 It does not affect the MPCore. This option enables the ARM Ltd.
958 recommended workaround.
960 config ARM_ERRATA_430973
961 bool "ARM errata: Stale prediction on replaced interworking branch"
964 This option enables the workaround for the 430973 Cortex-A8
965 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
966 interworking branch is replaced with another code sequence at the
967 same virtual address, whether due to self-modifying code or virtual
968 to physical address re-mapping, Cortex-A8 does not recover from the
969 stale interworking branch prediction. This results in Cortex-A8
970 executing the new code sequence in the incorrect ARM or Thumb state.
971 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
972 and also flushes the branch target cache at every context switch.
973 Note that setting specific bits in the ACTLR register may not be
974 available in non-secure mode.
976 config ARM_ERRATA_458693
977 bool "ARM errata: Processor deadlock when a false hazard is created"
980 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
981 erratum. For very specific sequences of memory operations, it is
982 possible for a hazard condition intended for a cache line to instead
983 be incorrectly associated with a different cache line. This false
984 hazard might then cause a processor deadlock. The workaround enables
985 the L1 caching of the NEON accesses and disables the PLD instruction
986 in the ACTLR register. Note that setting specific bits in the ACTLR
987 register may not be available in non-secure mode.
989 config ARM_ERRATA_460075
990 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
993 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
994 erratum. Any asynchronous access to the L2 cache may encounter a
995 situation in which recent store transactions to the L2 cache are lost
996 and overwritten with stale memory contents from external memory. The
997 workaround disables the write-allocate mode for the L2 cache via the
998 ACTLR register. Note that setting specific bits in the ACTLR register
999 may not be available in non-secure mode.
1001 config PL310_ERRATA_588369
1002 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1003 depends on CACHE_L2X0 && ARCH_OMAP4
1005 The PL310 L2 cache controller implements three types of Clean &
1006 Invalidate maintenance operations: by Physical Address
1007 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1008 They are architecturally defined to behave as the execution of a
1009 clean operation followed immediately by an invalidate operation,
1010 both performing to the same memory location. This functionality
1011 is not correctly implemented in PL310 as clean lines are not
1012 invalidated as a result of these operations. Note that this errata
1013 uses Texas Instrument's secure monitor api.
1016 source "arch/arm/common/Kconfig"
1018 config FORCE_MAX_ZONEORDER
1031 Find out whether you have ISA slots on your motherboard. ISA is the
1032 name of a bus system, i.e. the way the CPU talks to the other stuff
1033 inside your box. Other bus systems are PCI, EISA, MicroChannel
1034 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1035 newer boards don't support it. If you have ISA, say Y, otherwise N.
1037 # Select ISA DMA controller support
1042 # Select ISA DMA interface
1047 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1049 Find out whether you have a PCI motherboard. PCI is the name of a
1050 bus system, i.e. the way the CPU talks to the other stuff inside
1051 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1052 VESA. If you have PCI, say Y, otherwise N.
1061 # Select the host bridge type
1062 config PCI_HOST_VIA82C505
1064 depends on PCI && ARCH_SHARK
1067 config PCI_HOST_ITE8152
1069 depends on PCI && MACH_ARMCORE
1073 source "drivers/pci/Kconfig"
1075 source "drivers/pcmcia/Kconfig"
1079 menu "Kernel Features"
1081 source "kernel/time/Kconfig"
1084 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1085 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1086 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1087 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1088 depends on GENERIC_CLOCKEVENTS
1089 select USE_GENERIC_SMP_HELPERS
1090 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1092 This enables support for systems with more than one CPU. If you have
1093 a system with only one CPU, like most personal computers, say N. If
1094 you have a system with more than one CPU, say Y.
1096 If you say N here, the kernel will run on single and multiprocessor
1097 machines, but will use only one CPU of a multiprocessor machine. If
1098 you say Y here, the kernel will run on many, but not all, single
1099 processor machines. On a single processor machine, the kernel will
1100 run faster if you say N here.
1102 See also <file:Documentation/i386/IO-APIC.txt>,
1103 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1104 <http://www.linuxdoc.org/docs.html#howto>.
1106 If you don't know what to do here, say N.
1112 This option enables support for the ARM system coherency unit
1118 This options enables support for the ARM timer and watchdog unit
1121 prompt "Memory split"
1124 Select the desired split between kernel and user memory.
1126 If you are not absolutely sure what you are doing, leave this
1130 bool "3G/1G user/kernel split"
1132 bool "2G/2G user/kernel split"
1134 bool "1G/3G user/kernel split"
1139 default 0x40000000 if VMSPLIT_1G
1140 default 0x80000000 if VMSPLIT_2G
1144 int "Maximum number of CPUs (2-32)"
1150 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1151 depends on SMP && HOTPLUG && EXPERIMENTAL
1153 Say Y here to experiment with turning CPUs off and on. CPUs
1154 can be controlled through /sys/devices/system/cpu.
1157 bool "Use local timer interrupts"
1158 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1159 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1161 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1163 Enable support for local timers on SMP platforms, rather then the
1164 legacy IPI broadcast method. Local timers allows the system
1165 accounting to be spread across the timer interval, preventing a
1166 "thundering herd" at every timer tick.
1168 source kernel/Kconfig.preempt
1172 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1173 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1174 default AT91_TIMER_HZ if ARCH_AT91
1177 config THUMB2_KERNEL
1178 bool "Compile the kernel in Thumb-2 mode"
1179 depends on CPU_V7 && EXPERIMENTAL
1181 select ARM_ASM_UNIFIED
1183 By enabling this option, the kernel will be compiled in
1184 Thumb-2 mode. A compiler/assembler that understand the unified
1185 ARM-Thumb syntax is needed.
1189 config ARM_ASM_UNIFIED
1193 bool "Use the ARM EABI to compile the kernel"
1195 This option allows for the kernel to be compiled using the latest
1196 ARM ABI (aka EABI). This is only useful if you are using a user
1197 space environment that is also compiled with EABI.
1199 Since there are major incompatibilities between the legacy ABI and
1200 EABI, especially with regard to structure member alignment, this
1201 option also changes the kernel syscall calling convention to
1202 disambiguate both ABIs and allow for backward compatibility support
1203 (selected with CONFIG_OABI_COMPAT).
1205 To use this you need GCC version 4.0.0 or later.
1208 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1209 depends on AEABI && EXPERIMENTAL
1212 This option preserves the old syscall interface along with the
1213 new (ARM EABI) one. It also provides a compatibility layer to
1214 intercept syscalls that have structure arguments which layout
1215 in memory differs between the legacy ABI and the new ARM EABI
1216 (only for non "thumb" binaries). This option adds a tiny
1217 overhead to all syscalls and produces a slightly larger kernel.
1218 If you know you'll be using only pure EABI user space then you
1219 can say N here. If this option is not selected and you attempt
1220 to execute a legacy ABI binary then the result will be
1221 UNPREDICTABLE (in fact it can be predicted that it won't work
1222 at all). If in doubt say Y.
1224 config ARCH_HAS_HOLES_MEMORYMODEL
1227 # Discontigmem is deprecated
1228 config ARCH_DISCONTIGMEM_ENABLE
1231 config ARCH_SPARSEMEM_ENABLE
1234 config ARCH_SPARSEMEM_DEFAULT
1235 def_bool ARCH_SPARSEMEM_ENABLE
1237 config ARCH_SELECT_MEMORY_MODEL
1238 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1242 default "4" if ARCH_LH7A40X
1244 depends on NEED_MULTIPLE_NODES
1247 bool "High Memory Support (EXPERIMENTAL)"
1248 depends on MMU && EXPERIMENTAL
1250 The address space of ARM processors is only 4 Gigabytes large
1251 and it has to accommodate user address space, kernel address
1252 space as well as some memory mapped IO. That means that, if you
1253 have a large amount of physical memory and/or IO, not all of the
1254 memory can be "permanently mapped" by the kernel. The physical
1255 memory that is not permanently mapped is called "high memory".
1257 Depending on the selected kernel/user memory split, minimum
1258 vmalloc space and actual amount of RAM, you may not need this
1259 option which should result in a slightly faster kernel.
1264 bool "Allocate 2nd-level pagetables from highmem"
1266 depends on !OUTER_CACHE
1268 config HW_PERF_EVENTS
1269 bool "Enable hardware performance counter support for perf events"
1270 depends on PERF_EVENTS && CPU_HAS_PMU
1273 Enable hardware performance counter support for perf events. If
1274 disabled, perf events will use software events only.
1279 bool "Timer and CPU usage LEDs"
1280 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1281 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1282 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1283 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1284 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1285 ARCH_AT91 || ARCH_DAVINCI || \
1286 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1288 If you say Y here, the LEDs on your machine will be used
1289 to provide useful information about your current system status.
1291 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1292 be able to select which LEDs are active using the options below. If
1293 you are compiling a kernel for the EBSA-110 or the LART however, the
1294 red LED will simply flash regularly to indicate that the system is
1295 still functional. It is safe to say Y here if you have a CATS
1296 system, but the driver will do nothing.
1299 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1300 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1301 || MACH_OMAP_PERSEUS2
1303 depends on !GENERIC_CLOCKEVENTS
1304 default y if ARCH_EBSA110
1306 If you say Y here, one of the system LEDs (the green one on the
1307 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1308 will flash regularly to indicate that the system is still
1309 operational. This is mainly useful to kernel hackers who are
1310 debugging unstable kernels.
1312 The LART uses the same LED for both Timer LED and CPU usage LED
1313 functions. You may choose to use both, but the Timer LED function
1314 will overrule the CPU usage LED.
1317 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1319 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1320 || MACH_OMAP_PERSEUS2
1323 If you say Y here, the red LED will be used to give a good real
1324 time indication of CPU usage, by lighting whenever the idle task
1325 is not currently executing.
1327 The LART uses the same LED for both Timer LED and CPU usage LED
1328 functions. You may choose to use both, but the Timer LED function
1329 will overrule the CPU usage LED.
1331 config ALIGNMENT_TRAP
1333 depends on CPU_CP15_MMU
1334 default y if !ARCH_EBSA110
1335 select HAVE_PROC_CPU if PROC_FS
1337 ARM processors cannot fetch/store information which is not
1338 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1339 address divisible by 4. On 32-bit ARM processors, these non-aligned
1340 fetch/store instructions will be emulated in software if you say
1341 here, which has a severe performance impact. This is necessary for
1342 correct operation of some network protocols. With an IP-only
1343 configuration it is safe to say N, otherwise say Y.
1345 config UACCESS_WITH_MEMCPY
1346 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1347 depends on MMU && EXPERIMENTAL
1348 default y if CPU_FEROCEON
1350 Implement faster copy_to_user and clear_user methods for CPU
1351 cores where a 8-word STM instruction give significantly higher
1352 memory write throughput than a sequence of individual 32bit stores.
1354 A possible side effect is a slight increase in scheduling latency
1355 between threads sharing the same address space if they invoke
1356 such copy operations with large buffers.
1358 However, if the CPU data cache is using a write-allocate mode,
1359 this option is unlikely to provide any performance gain.
1365 # Compressed boot loader in ROM. Yes, we really want to ask about
1366 # TEXT and BSS so we preserve their values in the config files.
1367 config ZBOOT_ROM_TEXT
1368 hex "Compressed ROM boot loader base address"
1371 The physical address at which the ROM-able zImage is to be
1372 placed in the target. Platforms which normally make use of
1373 ROM-able zImage formats normally set this to a suitable
1374 value in their defconfig file.
1376 If ZBOOT_ROM is not enabled, this has no effect.
1378 config ZBOOT_ROM_BSS
1379 hex "Compressed ROM boot loader BSS address"
1382 The base address of an area of read/write memory in the target
1383 for the ROM-able zImage which must be available while the
1384 decompressor is running. It must be large enough to hold the
1385 entire decompressed kernel plus an additional 128 KiB.
1386 Platforms which normally make use of ROM-able zImage formats
1387 normally set this to a suitable value in their defconfig file.
1389 If ZBOOT_ROM is not enabled, this has no effect.
1392 bool "Compressed boot loader in ROM/flash"
1393 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1395 Say Y here if you intend to execute your compressed kernel image
1396 (zImage) directly from ROM or flash. If unsure, say N.
1399 string "Default kernel command string"
1402 On some architectures (EBSA110 and CATS), there is currently no way
1403 for the boot loader to pass arguments to the kernel. For these
1404 architectures, you should supply some command-line options at build
1405 time by entering them here. As a minimum, you should specify the
1406 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1408 config CMDLINE_FORCE
1409 bool "Always use the default kernel command string"
1410 depends on CMDLINE != ""
1412 Always use the default kernel command string, even if the boot
1413 loader passes other arguments to the kernel.
1414 This is useful if you cannot or don't want to change the
1415 command-line options your boot loader passes to the kernel.
1420 bool "Kernel Execute-In-Place from ROM"
1421 depends on !ZBOOT_ROM
1423 Execute-In-Place allows the kernel to run from non-volatile storage
1424 directly addressable by the CPU, such as NOR flash. This saves RAM
1425 space since the text section of the kernel is not loaded from flash
1426 to RAM. Read-write sections, such as the data section and stack,
1427 are still copied to RAM. The XIP kernel is not compressed since
1428 it has to run directly from flash, so it will take more space to
1429 store it. The flash address used to link the kernel object files,
1430 and for storing it, is configuration dependent. Therefore, if you
1431 say Y here, you must know the proper physical address where to
1432 store the kernel image depending on your own flash memory usage.
1434 Also note that the make target becomes "make xipImage" rather than
1435 "make zImage" or "make Image". The final kernel binary to put in
1436 ROM memory will be arch/arm/boot/xipImage.
1440 config XIP_PHYS_ADDR
1441 hex "XIP Kernel Physical Location"
1442 depends on XIP_KERNEL
1443 default "0x00080000"
1445 This is the physical address in your flash memory the kernel will
1446 be linked for and stored to. This address is dependent on your
1450 bool "Kexec system call (EXPERIMENTAL)"
1451 depends on EXPERIMENTAL
1453 kexec is a system call that implements the ability to shutdown your
1454 current kernel, and to start another kernel. It is like a reboot
1455 but it is independent of the system firmware. And like a reboot
1456 you can start any kernel with it, not just Linux.
1458 It is an ongoing process to be certain the hardware in a machine
1459 is properly shutdown, so do not be surprised if this code does not
1460 initially work for you. It may help to enable device hotplugging
1464 bool "Export atags in procfs"
1468 Should the atags used to boot the kernel be exported in an "atags"
1469 file in procfs. Useful with kexec.
1473 menu "CPU Power Management"
1477 source "drivers/cpufreq/Kconfig"
1479 config CPU_FREQ_SA1100
1482 config CPU_FREQ_SA1110
1485 config CPU_FREQ_INTEGRATOR
1486 tristate "CPUfreq driver for ARM Integrator CPUs"
1487 depends on ARCH_INTEGRATOR && CPU_FREQ
1490 This enables the CPUfreq driver for ARM Integrator CPUs.
1492 For details, take a look at <file:Documentation/cpu-freq>.
1498 depends on CPU_FREQ && ARCH_PXA && PXA25x
1500 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1502 config CPU_FREQ_S3C64XX
1503 bool "CPUfreq support for Samsung S3C64XX CPUs"
1504 depends on CPU_FREQ && CPU_S3C6410
1509 Internal configuration node for common cpufreq on Samsung SoC
1511 config CPU_FREQ_S3C24XX
1512 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1513 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1516 This enables the CPUfreq driver for the Samsung S3C24XX family
1519 For details, take a look at <file:Documentation/cpu-freq>.
1523 config CPU_FREQ_S3C24XX_PLL
1524 bool "Support CPUfreq changing of PLL frequency"
1525 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1527 Compile in support for changing the PLL frequency from the
1528 S3C24XX series CPUfreq driver. The PLL takes time to settle
1529 after a frequency change, so by default it is not enabled.
1531 This also means that the PLL tables for the selected CPU(s) will
1532 be built which may increase the size of the kernel image.
1534 config CPU_FREQ_S3C24XX_DEBUG
1535 bool "Debug CPUfreq Samsung driver core"
1536 depends on CPU_FREQ_S3C24XX
1538 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1540 config CPU_FREQ_S3C24XX_IODEBUG
1541 bool "Debug CPUfreq Samsung driver IO timing"
1542 depends on CPU_FREQ_S3C24XX
1544 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1546 config CPU_FREQ_S3C24XX_DEBUGFS
1547 bool "Export debugfs for CPUFreq"
1548 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1550 Export status information via debugfs.
1554 source "drivers/cpuidle/Kconfig"
1558 menu "Floating point emulation"
1560 comment "At least one emulation must be selected"
1563 bool "NWFPE math emulation"
1564 depends on !AEABI || OABI_COMPAT
1566 Say Y to include the NWFPE floating point emulator in the kernel.
1567 This is necessary to run most binaries. Linux does not currently
1568 support floating point hardware so you need to say Y here even if
1569 your machine has an FPA or floating point co-processor podule.
1571 You may say N here if you are going to load the Acorn FPEmulator
1572 early in the bootup.
1575 bool "Support extended precision"
1576 depends on FPE_NWFPE
1578 Say Y to include 80-bit support in the kernel floating-point
1579 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1580 Note that gcc does not generate 80-bit operations by default,
1581 so in most cases this option only enlarges the size of the
1582 floating point emulator without any good reason.
1584 You almost surely want to say N here.
1587 bool "FastFPE math emulation (EXPERIMENTAL)"
1588 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1590 Say Y here to include the FAST floating point emulator in the kernel.
1591 This is an experimental much faster emulator which now also has full
1592 precision for the mantissa. It does not support any exceptions.
1593 It is very simple, and approximately 3-6 times faster than NWFPE.
1595 It should be sufficient for most programs. It may be not suitable
1596 for scientific calculations, but you have to check this for yourself.
1597 If you do not feel you need a faster FP emulation you should better
1601 bool "VFP-format floating point maths"
1602 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1604 Say Y to include VFP support code in the kernel. This is needed
1605 if your hardware includes a VFP unit.
1607 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1608 release notes and additional status information.
1610 Say N if your target does not have VFP hardware.
1618 bool "Advanced SIMD (NEON) Extension support"
1619 depends on VFPv3 && CPU_V7
1621 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1626 menu "Userspace binary formats"
1628 source "fs/Kconfig.binfmt"
1631 tristate "RISC OS personality"
1634 Say Y here to include the kernel code necessary if you want to run
1635 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1636 experimental; if this sounds frightening, say N and sleep in peace.
1637 You can also say M here to compile this support as a module (which
1638 will be called arthur).
1642 menu "Power management options"
1644 source "kernel/power/Kconfig"
1646 config ARCH_SUSPEND_POSSIBLE
1651 source "net/Kconfig"
1653 source "drivers/Kconfig"
1657 source "arch/arm/Kconfig.debug"
1659 source "security/Kconfig"
1661 source "crypto/Kconfig"
1663 source "lib/Kconfig"