2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
15 select SYS_SUPPORTS_APM_EMULATION
16 select GENERIC_ATOMIC64 if (!CPU_32v6K)
17 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
19 select HAVE_KPROBES if (!XIP_KERNEL)
20 select HAVE_KRETPROBES if (HAVE_KPROBES)
21 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
22 select HAVE_GENERIC_DMA_COHERENT
23 select HAVE_KERNEL_GZIP
24 select HAVE_KERNEL_LZO
25 select HAVE_KERNEL_LZMA
26 select HAVE_PERF_EVENTS
27 select PERF_USE_VMALLOC
28 select HAVE_REGS_AND_STACK_ACCESS_API
30 The ARM series is a line of low-power-consumption RISC chip designs
31 licensed by ARM Ltd and targeted at embedded applications and
32 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
33 manufactured, but legacy ARM-based PC hardware remains popular in
34 Europe. There is an ARM Linux project with a web page at
35 <http://www.arm.linux.org.uk/>.
40 config SYS_SUPPORTS_APM_EMULATION
50 config ARCH_USES_GETTIMEOFFSET
54 config GENERIC_CLOCKEVENTS
57 config GENERIC_CLOCKEVENTS_BROADCAST
59 depends on GENERIC_CLOCKEVENTS
60 default y if SMP && !LOCAL_TIMERS
64 select GENERIC_ALLOCATOR
75 The Extended Industry Standard Architecture (EISA) bus was
76 developed as an open alternative to the IBM MicroChannel bus.
78 The EISA bus provided some of the features of the IBM MicroChannel
79 bus while maintaining backward compatibility with cards made for
80 the older ISA bus. The EISA bus saw limited use between 1988 and
81 1995 when it was made obsolete by the PCI bus.
83 Say Y here if you are building a kernel for an EISA-based machine.
93 MicroChannel Architecture is found in some IBM PS/2 machines and
94 laptops. It is a bus system similar to PCI or ISA. See
95 <file:Documentation/mca.txt> (and especially the web page given
96 there) before attempting to build an MCA bus kernel.
98 config GENERIC_HARDIRQS
102 config STACKTRACE_SUPPORT
106 config HAVE_LATENCYTOP_SUPPORT
111 config LOCKDEP_SUPPORT
115 config TRACE_IRQFLAGS_SUPPORT
119 config HARDIRQS_SW_RESEND
123 config GENERIC_IRQ_PROBE
127 config GENERIC_LOCKBREAK
130 depends on SMP && PREEMPT
132 config RWSEM_GENERIC_SPINLOCK
136 config RWSEM_XCHGADD_ALGORITHM
139 config ARCH_HAS_ILOG2_U32
142 config ARCH_HAS_ILOG2_U64
145 config ARCH_HAS_CPUFREQ
148 Internal node to signify that the ARCH has CPUFREQ support
149 and that the relevant menu configurations are displayed for
152 config GENERIC_HWEIGHT
156 config GENERIC_CALIBRATE_DELAY
160 config ARCH_MAY_HAVE_PC_FDC
166 config NEED_DMA_MAP_STATE
169 config GENERIC_ISA_DMA
178 config GENERIC_HARDIRQS_NO__DO_IRQ
181 config ARM_L1_CACHE_SHIFT_6
184 Setting ARM L1 cache line size to 64 Bytes.
188 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
189 default DRAM_BASE if REMAP_VECTORS_TO_RAM
192 The base address of exception vectors.
194 source "init/Kconfig"
196 source "kernel/Kconfig.freezer"
201 bool "MMU-based Paged Memory Management Support"
204 Select if you want MMU-based virtualised addressing space
205 support by paged memory management. If unsure, say 'Y'.
208 # The "ARM system type" choice list is ordered alphabetically by option
209 # text. Please add new entries in the option alphabetic order.
212 prompt "ARM system type"
213 default ARCH_VERSATILE
216 bool "Agilent AAEC-2000 based"
220 select ARCH_USES_GETTIMEOFFSET
222 This enables support for systems based on the Agilent AAEC-2000
224 config ARCH_INTEGRATOR
225 bool "ARM Ltd. Integrator family"
227 select ARCH_HAS_CPUFREQ
230 select GENERIC_CLOCKEVENTS
231 select PLAT_VERSATILE
233 Support for ARM's Integrator platform.
236 bool "ARM Ltd. RealView family"
240 select GENERIC_CLOCKEVENTS
241 select ARCH_WANT_OPTIONAL_GPIOLIB
242 select PLAT_VERSATILE
243 select ARM_TIMER_SP804
244 select GPIO_PL061 if GPIOLIB
246 This enables support for ARM Ltd RealView boards.
248 config ARCH_VERSATILE
249 bool "ARM Ltd. Versatile family"
254 select GENERIC_CLOCKEVENTS
255 select ARCH_WANT_OPTIONAL_GPIOLIB
256 select PLAT_VERSATILE
257 select ARM_TIMER_SP804
259 This enables support for ARM Ltd Versatile board.
262 bool "ARM Ltd. Versatile Express family"
263 select ARCH_WANT_OPTIONAL_GPIOLIB
265 select ARM_TIMER_SP804
267 select GENERIC_CLOCKEVENTS
270 select PLAT_VERSATILE
272 This enables support for the ARM Ltd Versatile Express boards.
276 select ARCH_REQUIRE_GPIOLIB
278 select ARCH_USES_GETTIMEOFFSET
280 This enables support for systems based on the Atmel AT91RM9200,
281 AT91SAM9 and AT91CAP9 processors.
284 bool "Broadcom BCMRING"
289 select GENERIC_CLOCKEVENTS
290 select ARCH_WANT_OPTIONAL_GPIOLIB
292 Support for Broadcom's BCMRing platform.
295 bool "Cirrus Logic CLPS711x/EP721x-based"
297 select ARCH_USES_GETTIMEOFFSET
299 Support for Cirrus Logic 711x/721x based boards.
302 bool "Cavium Networks CNS3XXX family"
304 select GENERIC_CLOCKEVENTS
307 Support for Cavium Networks CNS3XXX platform.
310 bool "Cortina Systems Gemini"
312 select ARCH_REQUIRE_GPIOLIB
313 select ARCH_USES_GETTIMEOFFSET
315 Support for the Cortina Systems Gemini family SoCs
322 select ARCH_USES_GETTIMEOFFSET
324 This is an evaluation board for the StrongARM processor available
325 from Digital. It has limited hardware on-board, including an
326 Ethernet interface, two PCMCIA sockets, two serial ports and a
335 select ARCH_REQUIRE_GPIOLIB
336 select ARCH_HAS_HOLES_MEMORYMODEL
337 select ARCH_USES_GETTIMEOFFSET
339 This enables support for the Cirrus EP93xx series of CPUs.
341 config ARCH_FOOTBRIDGE
345 select ARCH_USES_GETTIMEOFFSET
347 Support for systems based on the DC21285 companion chip
348 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
351 bool "Freescale MXC/iMX-based"
352 select GENERIC_CLOCKEVENTS
353 select ARCH_REQUIRE_GPIOLIB
356 Support for Freescale MXC/iMX-based family of processors
359 bool "Freescale STMP3xxx"
362 select ARCH_REQUIRE_GPIOLIB
363 select GENERIC_CLOCKEVENTS
364 select USB_ARCH_HAS_EHCI
366 Support for systems based on the Freescale 3xxx CPUs.
369 bool "Hilscher NetX based"
372 select GENERIC_CLOCKEVENTS
374 This enables support for systems based on the Hilscher NetX Soc
377 bool "Hynix HMS720x-based"
380 select ARCH_USES_GETTIMEOFFSET
382 This enables support for systems based on the Hynix HMS720x
390 select ARCH_SUPPORTS_MSI
393 Support for Intel's IOP13XX (XScale) family of processors.
401 select ARCH_REQUIRE_GPIOLIB
403 Support for Intel's 80219 and IOP32X (XScale) family of
412 select ARCH_REQUIRE_GPIOLIB
414 Support for Intel's IOP33X (XScale) family of processors.
421 select ARCH_USES_GETTIMEOFFSET
423 Support for Intel's IXP23xx (XScale) family of processors.
426 bool "IXP2400/2800-based"
430 select ARCH_USES_GETTIMEOFFSET
432 Support for Intel's IXP2400/2800 (XScale) family of processors.
439 select GENERIC_CLOCKEVENTS
440 select DMABOUNCE if PCI
442 Support for Intel's IXP4XX (XScale) family of processors.
447 select ARCH_REQUIRE_GPIOLIB
448 select GENERIC_CLOCKEVENTS
451 Support for the Marvell Dove SoC 88AP510
454 bool "Marvell Kirkwood"
457 select ARCH_REQUIRE_GPIOLIB
458 select GENERIC_CLOCKEVENTS
461 Support for the following Marvell Kirkwood series SoCs:
462 88F6180, 88F6192 and 88F6281.
465 bool "Marvell Loki (88RC8480)"
467 select GENERIC_CLOCKEVENTS
470 Support for the Marvell Loki (88RC8480) SoC.
473 bool "Marvell MV78xx0"
476 select ARCH_REQUIRE_GPIOLIB
477 select GENERIC_CLOCKEVENTS
480 Support for the following Marvell MV78xx0 series SoCs:
488 select ARCH_REQUIRE_GPIOLIB
489 select GENERIC_CLOCKEVENTS
492 Support for the following Marvell Orion 5x series SoCs:
493 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
494 Orion-2 (5281), Orion-1-90 (6183).
497 bool "Marvell PXA168/910/MMP2"
499 select ARCH_REQUIRE_GPIOLIB
501 select GENERIC_CLOCKEVENTS
505 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
508 bool "Micrel/Kendin KS8695"
510 select ARCH_REQUIRE_GPIOLIB
511 select ARCH_USES_GETTIMEOFFSET
513 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
514 System-on-Chip devices.
517 bool "NetSilicon NS9xxx"
520 select GENERIC_CLOCKEVENTS
523 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
526 <http://www.digi.com/products/microprocessors/index.jsp>
529 bool "Nuvoton W90X900 CPU"
531 select ARCH_REQUIRE_GPIOLIB
533 select GENERIC_CLOCKEVENTS
535 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
536 At present, the w90x900 has been renamed nuc900, regarding
537 the ARM series product line, you can login the following
538 link address to know more.
540 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
541 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
544 bool "Nuvoton NUC93X CPU"
548 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
549 low-power and high performance MPEG-4/JPEG multimedia controller chip.
552 bool "Philips Nexperia PNX4008 Mobile"
555 select ARCH_USES_GETTIMEOFFSET
557 This enables support for Philips PNX4008 mobile platform.
560 bool "PXA2xx/PXA3xx-based"
563 select ARCH_HAS_CPUFREQ
565 select ARCH_REQUIRE_GPIOLIB
566 select GENERIC_CLOCKEVENTS
570 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
575 select GENERIC_CLOCKEVENTS
577 Support for Qualcomm MSM/QSD based systems. This runs on the
578 apps processor of the MSM/QSD and depends on a shared memory
579 interface to the modem processor which runs the baseband
580 stack and controls some vital subsystems
581 (clock and power control, etc).
584 bool "Renesas SH-Mobile"
586 Support for Renesas's SH-Mobile ARM platforms
593 select ARCH_MAY_HAVE_PC_FDC
594 select HAVE_PATA_PLATFORM
597 select ARCH_SPARSEMEM_ENABLE
598 select ARCH_USES_GETTIMEOFFSET
600 On the Acorn Risc-PC, Linux can support the internal IDE disk and
601 CD-ROM interface, serial and parallel port, and the floppy drive.
607 select ARCH_SPARSEMEM_ENABLE
609 select ARCH_HAS_CPUFREQ
611 select GENERIC_CLOCKEVENTS
614 select ARCH_REQUIRE_GPIOLIB
616 Support for StrongARM 11x0 based boards.
619 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
621 select ARCH_HAS_CPUFREQ
623 select ARCH_USES_GETTIMEOFFSET
625 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
626 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
627 the Samsung SMDK2410 development board (and derivatives).
629 Note, the S3C2416 and the S3C2450 are so close that they even share
630 the same SoC ID code. This means that there is no seperate machine
631 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
634 bool "Samsung S3C64XX"
640 select ARCH_USES_GETTIMEOFFSET
641 select ARCH_HAS_CPUFREQ
642 select ARCH_REQUIRE_GPIOLIB
643 select SAMSUNG_CLKSRC
644 select SAMSUNG_IRQ_VIC_TIMER
645 select SAMSUNG_IRQ_UART
646 select S3C_GPIO_TRACK
647 select S3C_GPIO_PULL_UPDOWN
648 select S3C_GPIO_CFG_S3C24XX
649 select S3C_GPIO_CFG_S3C64XX
651 select USB_ARCH_HAS_OHCI
652 select SAMSUNG_GPIOLIB_4BIT
654 Samsung S3C64XX series based systems
657 bool "Samsung S5P6440"
661 select ARCH_USES_GETTIMEOFFSET
663 Samsung S5P6440 CPU based systems
666 bool "Samsung S5P6442"
670 select ARCH_USES_GETTIMEOFFSET
672 Samsung S5P6442 CPU based systems
675 bool "Samsung S5PC100"
679 select ARM_L1_CACHE_SHIFT_6
680 select ARCH_USES_GETTIMEOFFSET
682 Samsung S5PC100 series based systems
685 bool "Samsung S5PV210/S5PC110"
689 select ARM_L1_CACHE_SHIFT_6
690 select ARCH_USES_GETTIMEOFFSET
692 Samsung S5PV210/S5PC110 series based systems
701 select ARCH_USES_GETTIMEOFFSET
703 Support for the StrongARM based Digital DNARD machine, also known
704 as "Shark" (<http://www.shark-linux.de/shark.html>).
709 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
710 select ARCH_USES_GETTIMEOFFSET
712 Say Y here for systems based on one of the Sharp LH7A40X
713 System on a Chip processors. These CPUs include an ARM922T
714 core with a wide array of integrated devices for
715 hand-held and low-power applications.
718 bool "ST-Ericsson U300 Series"
724 select GENERIC_CLOCKEVENTS
728 Support for ST-Ericsson U300 series mobile platforms.
731 bool "ST-Ericsson U8500 Series"
734 select GENERIC_CLOCKEVENTS
736 select ARCH_REQUIRE_GPIOLIB
738 Support for ST-Ericsson's Ux500 architecture
741 bool "STMicroelectronics Nomadik"
746 select GENERIC_CLOCKEVENTS
747 select ARCH_REQUIRE_GPIOLIB
749 Support for the Nomadik platform by ST-Ericsson
753 select GENERIC_CLOCKEVENTS
754 select ARCH_REQUIRE_GPIOLIB
758 select GENERIC_ALLOCATOR
759 select ARCH_HAS_HOLES_MEMORYMODEL
761 Support for TI's DaVinci platform.
766 select ARCH_REQUIRE_GPIOLIB
767 select ARCH_HAS_CPUFREQ
768 select GENERIC_CLOCKEVENTS
769 select ARCH_HAS_HOLES_MEMORYMODEL
771 Support for TI's OMAP platform (OMAP1 and OMAP2).
776 select ARCH_REQUIRE_GPIOLIB
778 select GENERIC_CLOCKEVENTS
781 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
786 # This is sorted alphabetically by mach-* pathname. However, plat-*
787 # Kconfigs may be included either alphabetically (according to the
788 # plat- suffix) or along side the corresponding mach-* source.
790 source "arch/arm/mach-aaec2000/Kconfig"
792 source "arch/arm/mach-at91/Kconfig"
794 source "arch/arm/mach-bcmring/Kconfig"
796 source "arch/arm/mach-clps711x/Kconfig"
798 source "arch/arm/mach-cns3xxx/Kconfig"
800 source "arch/arm/mach-davinci/Kconfig"
802 source "arch/arm/mach-dove/Kconfig"
804 source "arch/arm/mach-ep93xx/Kconfig"
806 source "arch/arm/mach-footbridge/Kconfig"
808 source "arch/arm/mach-gemini/Kconfig"
810 source "arch/arm/mach-h720x/Kconfig"
812 source "arch/arm/mach-integrator/Kconfig"
814 source "arch/arm/mach-iop32x/Kconfig"
816 source "arch/arm/mach-iop33x/Kconfig"
818 source "arch/arm/mach-iop13xx/Kconfig"
820 source "arch/arm/mach-ixp4xx/Kconfig"
822 source "arch/arm/mach-ixp2000/Kconfig"
824 source "arch/arm/mach-ixp23xx/Kconfig"
826 source "arch/arm/mach-kirkwood/Kconfig"
828 source "arch/arm/mach-ks8695/Kconfig"
830 source "arch/arm/mach-lh7a40x/Kconfig"
832 source "arch/arm/mach-loki/Kconfig"
834 source "arch/arm/mach-msm/Kconfig"
836 source "arch/arm/mach-mv78xx0/Kconfig"
838 source "arch/arm/plat-mxc/Kconfig"
840 source "arch/arm/mach-netx/Kconfig"
842 source "arch/arm/mach-nomadik/Kconfig"
843 source "arch/arm/plat-nomadik/Kconfig"
845 source "arch/arm/mach-ns9xxx/Kconfig"
847 source "arch/arm/mach-nuc93x/Kconfig"
849 source "arch/arm/plat-omap/Kconfig"
851 source "arch/arm/mach-omap1/Kconfig"
853 source "arch/arm/mach-omap2/Kconfig"
855 source "arch/arm/mach-orion5x/Kconfig"
857 source "arch/arm/mach-pxa/Kconfig"
858 source "arch/arm/plat-pxa/Kconfig"
860 source "arch/arm/mach-mmp/Kconfig"
862 source "arch/arm/mach-realview/Kconfig"
864 source "arch/arm/mach-sa1100/Kconfig"
866 source "arch/arm/plat-samsung/Kconfig"
867 source "arch/arm/plat-s3c24xx/Kconfig"
868 source "arch/arm/plat-s5p/Kconfig"
870 source "arch/arm/plat-spear/Kconfig"
873 source "arch/arm/mach-s3c2400/Kconfig"
874 source "arch/arm/mach-s3c2410/Kconfig"
875 source "arch/arm/mach-s3c2412/Kconfig"
876 source "arch/arm/mach-s3c2416/Kconfig"
877 source "arch/arm/mach-s3c2440/Kconfig"
878 source "arch/arm/mach-s3c2443/Kconfig"
882 source "arch/arm/mach-s3c64xx/Kconfig"
885 source "arch/arm/mach-s5p6440/Kconfig"
887 source "arch/arm/mach-s5p6442/Kconfig"
889 source "arch/arm/mach-s5pc100/Kconfig"
891 source "arch/arm/mach-s5pv210/Kconfig"
893 source "arch/arm/mach-shmobile/Kconfig"
895 source "arch/arm/plat-stmp3xxx/Kconfig"
897 source "arch/arm/mach-u300/Kconfig"
899 source "arch/arm/mach-ux500/Kconfig"
901 source "arch/arm/mach-versatile/Kconfig"
903 source "arch/arm/mach-vexpress/Kconfig"
905 source "arch/arm/mach-w90x900/Kconfig"
907 # Definitions to make life easier
913 select GENERIC_CLOCKEVENTS
921 config PLAT_VERSATILE
924 config ARM_TIMER_SP804
927 source arch/arm/mm/Kconfig
930 bool "Enable iWMMXt support"
931 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
932 default y if PXA27x || PXA3xx || ARCH_MMP
934 Enable support for iWMMXt context switching at run time if
935 running on a CPU that supports it.
937 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
940 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
944 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
945 (!ARCH_OMAP3 || OMAP3_EMU)
950 source "arch/arm/Kconfig-nommu"
953 config ARM_ERRATA_411920
954 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
955 depends on CPU_V6 && !SMP
957 Invalidation of the Instruction Cache operation can
958 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
959 It does not affect the MPCore. This option enables the ARM Ltd.
960 recommended workaround.
962 config ARM_ERRATA_430973
963 bool "ARM errata: Stale prediction on replaced interworking branch"
966 This option enables the workaround for the 430973 Cortex-A8
967 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
968 interworking branch is replaced with another code sequence at the
969 same virtual address, whether due to self-modifying code or virtual
970 to physical address re-mapping, Cortex-A8 does not recover from the
971 stale interworking branch prediction. This results in Cortex-A8
972 executing the new code sequence in the incorrect ARM or Thumb state.
973 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
974 and also flushes the branch target cache at every context switch.
975 Note that setting specific bits in the ACTLR register may not be
976 available in non-secure mode.
978 config ARM_ERRATA_458693
979 bool "ARM errata: Processor deadlock when a false hazard is created"
982 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
983 erratum. For very specific sequences of memory operations, it is
984 possible for a hazard condition intended for a cache line to instead
985 be incorrectly associated with a different cache line. This false
986 hazard might then cause a processor deadlock. The workaround enables
987 the L1 caching of the NEON accesses and disables the PLD instruction
988 in the ACTLR register. Note that setting specific bits in the ACTLR
989 register may not be available in non-secure mode.
991 config ARM_ERRATA_460075
992 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
995 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
996 erratum. Any asynchronous access to the L2 cache may encounter a
997 situation in which recent store transactions to the L2 cache are lost
998 and overwritten with stale memory contents from external memory. The
999 workaround disables the write-allocate mode for the L2 cache via the
1000 ACTLR register. Note that setting specific bits in the ACTLR register
1001 may not be available in non-secure mode.
1003 config PL310_ERRATA_588369
1004 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1005 depends on CACHE_L2X0 && ARCH_OMAP4
1007 The PL310 L2 cache controller implements three types of Clean &
1008 Invalidate maintenance operations: by Physical Address
1009 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1010 They are architecturally defined to behave as the execution of a
1011 clean operation followed immediately by an invalidate operation,
1012 both performing to the same memory location. This functionality
1013 is not correctly implemented in PL310 as clean lines are not
1014 invalidated as a result of these operations. Note that this errata
1015 uses Texas Instrument's secure monitor api.
1018 source "arch/arm/common/Kconfig"
1028 Find out whether you have ISA slots on your motherboard. ISA is the
1029 name of a bus system, i.e. the way the CPU talks to the other stuff
1030 inside your box. Other bus systems are PCI, EISA, MicroChannel
1031 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1032 newer boards don't support it. If you have ISA, say Y, otherwise N.
1034 # Select ISA DMA controller support
1039 # Select ISA DMA interface
1044 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1046 Find out whether you have a PCI motherboard. PCI is the name of a
1047 bus system, i.e. the way the CPU talks to the other stuff inside
1048 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1049 VESA. If you have PCI, say Y, otherwise N.
1058 # Select the host bridge type
1059 config PCI_HOST_VIA82C505
1061 depends on PCI && ARCH_SHARK
1064 config PCI_HOST_ITE8152
1066 depends on PCI && MACH_ARMCORE
1070 source "drivers/pci/Kconfig"
1072 source "drivers/pcmcia/Kconfig"
1076 menu "Kernel Features"
1078 source "kernel/time/Kconfig"
1081 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1082 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1083 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1084 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1085 depends on GENERIC_CLOCKEVENTS
1086 select USE_GENERIC_SMP_HELPERS
1087 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1089 This enables support for systems with more than one CPU. If you have
1090 a system with only one CPU, like most personal computers, say N. If
1091 you have a system with more than one CPU, say Y.
1093 If you say N here, the kernel will run on single and multiprocessor
1094 machines, but will use only one CPU of a multiprocessor machine. If
1095 you say Y here, the kernel will run on many, but not all, single
1096 processor machines. On a single processor machine, the kernel will
1097 run faster if you say N here.
1099 See also <file:Documentation/i386/IO-APIC.txt>,
1100 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1101 <http://www.linuxdoc.org/docs.html#howto>.
1103 If you don't know what to do here, say N.
1109 This option enables support for the ARM system coherency unit
1115 This options enables support for the ARM timer and watchdog unit
1118 prompt "Memory split"
1121 Select the desired split between kernel and user memory.
1123 If you are not absolutely sure what you are doing, leave this
1127 bool "3G/1G user/kernel split"
1129 bool "2G/2G user/kernel split"
1131 bool "1G/3G user/kernel split"
1136 default 0x40000000 if VMSPLIT_1G
1137 default 0x80000000 if VMSPLIT_2G
1141 int "Maximum number of CPUs (2-32)"
1147 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1148 depends on SMP && HOTPLUG && EXPERIMENTAL
1150 Say Y here to experiment with turning CPUs off and on. CPUs
1151 can be controlled through /sys/devices/system/cpu.
1154 bool "Use local timer interrupts"
1155 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1156 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1157 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1159 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_VEXPRESS || ARCH_OMAP4 || ARCH_U8500)
1161 Enable support for local timers on SMP platforms, rather then the
1162 legacy IPI broadcast method. Local timers allows the system
1163 accounting to be spread across the timer interval, preventing a
1164 "thundering herd" at every timer tick.
1166 source kernel/Kconfig.preempt
1170 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1171 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1172 default AT91_TIMER_HZ if ARCH_AT91
1173 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1176 config THUMB2_KERNEL
1177 bool "Compile the kernel in Thumb-2 mode"
1178 depends on CPU_V7 && EXPERIMENTAL
1180 select ARM_ASM_UNIFIED
1182 By enabling this option, the kernel will be compiled in
1183 Thumb-2 mode. A compiler/assembler that understand the unified
1184 ARM-Thumb syntax is needed.
1188 config ARM_ASM_UNIFIED
1192 bool "Use the ARM EABI to compile the kernel"
1194 This option allows for the kernel to be compiled using the latest
1195 ARM ABI (aka EABI). This is only useful if you are using a user
1196 space environment that is also compiled with EABI.
1198 Since there are major incompatibilities between the legacy ABI and
1199 EABI, especially with regard to structure member alignment, this
1200 option also changes the kernel syscall calling convention to
1201 disambiguate both ABIs and allow for backward compatibility support
1202 (selected with CONFIG_OABI_COMPAT).
1204 To use this you need GCC version 4.0.0 or later.
1207 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1208 depends on AEABI && EXPERIMENTAL
1211 This option preserves the old syscall interface along with the
1212 new (ARM EABI) one. It also provides a compatibility layer to
1213 intercept syscalls that have structure arguments which layout
1214 in memory differs between the legacy ABI and the new ARM EABI
1215 (only for non "thumb" binaries). This option adds a tiny
1216 overhead to all syscalls and produces a slightly larger kernel.
1217 If you know you'll be using only pure EABI user space then you
1218 can say N here. If this option is not selected and you attempt
1219 to execute a legacy ABI binary then the result will be
1220 UNPREDICTABLE (in fact it can be predicted that it won't work
1221 at all). If in doubt say Y.
1223 config ARCH_HAS_HOLES_MEMORYMODEL
1226 config ARCH_SPARSEMEM_ENABLE
1229 config ARCH_SPARSEMEM_DEFAULT
1230 def_bool ARCH_SPARSEMEM_ENABLE
1232 config ARCH_SELECT_MEMORY_MODEL
1233 def_bool ARCH_SPARSEMEM_ENABLE
1236 bool "High Memory Support (EXPERIMENTAL)"
1237 depends on MMU && EXPERIMENTAL
1239 The address space of ARM processors is only 4 Gigabytes large
1240 and it has to accommodate user address space, kernel address
1241 space as well as some memory mapped IO. That means that, if you
1242 have a large amount of physical memory and/or IO, not all of the
1243 memory can be "permanently mapped" by the kernel. The physical
1244 memory that is not permanently mapped is called "high memory".
1246 Depending on the selected kernel/user memory split, minimum
1247 vmalloc space and actual amount of RAM, you may not need this
1248 option which should result in a slightly faster kernel.
1253 bool "Allocate 2nd-level pagetables from highmem"
1255 depends on !OUTER_CACHE
1257 config HW_PERF_EVENTS
1258 bool "Enable hardware performance counter support for perf events"
1259 depends on PERF_EVENTS && CPU_HAS_PMU
1262 Enable hardware performance counter support for perf events. If
1263 disabled, perf events will use software events only.
1266 bool "Support sparse irq numbering"
1267 depends on EXPERIMENTAL
1269 This enables support for sparse irqs. This is useful in general
1270 as most CPUs have a fairly sparse array of IRQ vectors, which
1271 the irq_desc then maps directly on to. Systems with a high
1272 number of off-chip IRQs will want to treat this as
1273 experimental until they have been independently verified.
1275 If you don't know what to do here, say N.
1279 config FORCE_MAX_ZONEORDER
1280 int "Maximum zone order" if ARCH_SHMOBILE
1281 range 11 64 if ARCH_SHMOBILE
1282 default "9" if SA1111
1285 The kernel memory allocator divides physically contiguous memory
1286 blocks into "zones", where each zone is a power of two number of
1287 pages. This option selects the largest power of two that the kernel
1288 keeps in the memory allocator. If you need to allocate very large
1289 blocks of physically contiguous memory, then you may need to
1290 increase this value.
1292 This config option is actually maximum order plus one. For example,
1293 a value of 11 means that the largest free memory block is 2^10 pages.
1296 bool "Timer and CPU usage LEDs"
1297 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1298 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1299 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1300 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1301 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1302 ARCH_AT91 || ARCH_DAVINCI || \
1303 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1305 If you say Y here, the LEDs on your machine will be used
1306 to provide useful information about your current system status.
1308 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1309 be able to select which LEDs are active using the options below. If
1310 you are compiling a kernel for the EBSA-110 or the LART however, the
1311 red LED will simply flash regularly to indicate that the system is
1312 still functional. It is safe to say Y here if you have a CATS
1313 system, but the driver will do nothing.
1316 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1317 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1318 || MACH_OMAP_PERSEUS2
1320 depends on !GENERIC_CLOCKEVENTS
1321 default y if ARCH_EBSA110
1323 If you say Y here, one of the system LEDs (the green one on the
1324 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1325 will flash regularly to indicate that the system is still
1326 operational. This is mainly useful to kernel hackers who are
1327 debugging unstable kernels.
1329 The LART uses the same LED for both Timer LED and CPU usage LED
1330 functions. You may choose to use both, but the Timer LED function
1331 will overrule the CPU usage LED.
1334 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1336 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1337 || MACH_OMAP_PERSEUS2
1340 If you say Y here, the red LED will be used to give a good real
1341 time indication of CPU usage, by lighting whenever the idle task
1342 is not currently executing.
1344 The LART uses the same LED for both Timer LED and CPU usage LED
1345 functions. You may choose to use both, but the Timer LED function
1346 will overrule the CPU usage LED.
1348 config ALIGNMENT_TRAP
1350 depends on CPU_CP15_MMU
1351 default y if !ARCH_EBSA110
1352 select HAVE_PROC_CPU if PROC_FS
1354 ARM processors cannot fetch/store information which is not
1355 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1356 address divisible by 4. On 32-bit ARM processors, these non-aligned
1357 fetch/store instructions will be emulated in software if you say
1358 here, which has a severe performance impact. This is necessary for
1359 correct operation of some network protocols. With an IP-only
1360 configuration it is safe to say N, otherwise say Y.
1362 config UACCESS_WITH_MEMCPY
1363 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1364 depends on MMU && EXPERIMENTAL
1365 default y if CPU_FEROCEON
1367 Implement faster copy_to_user and clear_user methods for CPU
1368 cores where a 8-word STM instruction give significantly higher
1369 memory write throughput than a sequence of individual 32bit stores.
1371 A possible side effect is a slight increase in scheduling latency
1372 between threads sharing the same address space if they invoke
1373 such copy operations with large buffers.
1375 However, if the CPU data cache is using a write-allocate mode,
1376 this option is unlikely to provide any performance gain.
1382 # Compressed boot loader in ROM. Yes, we really want to ask about
1383 # TEXT and BSS so we preserve their values in the config files.
1384 config ZBOOT_ROM_TEXT
1385 hex "Compressed ROM boot loader base address"
1388 The physical address at which the ROM-able zImage is to be
1389 placed in the target. Platforms which normally make use of
1390 ROM-able zImage formats normally set this to a suitable
1391 value in their defconfig file.
1393 If ZBOOT_ROM is not enabled, this has no effect.
1395 config ZBOOT_ROM_BSS
1396 hex "Compressed ROM boot loader BSS address"
1399 The base address of an area of read/write memory in the target
1400 for the ROM-able zImage which must be available while the
1401 decompressor is running. It must be large enough to hold the
1402 entire decompressed kernel plus an additional 128 KiB.
1403 Platforms which normally make use of ROM-able zImage formats
1404 normally set this to a suitable value in their defconfig file.
1406 If ZBOOT_ROM is not enabled, this has no effect.
1409 bool "Compressed boot loader in ROM/flash"
1410 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1412 Say Y here if you intend to execute your compressed kernel image
1413 (zImage) directly from ROM or flash. If unsure, say N.
1416 string "Default kernel command string"
1419 On some architectures (EBSA110 and CATS), there is currently no way
1420 for the boot loader to pass arguments to the kernel. For these
1421 architectures, you should supply some command-line options at build
1422 time by entering them here. As a minimum, you should specify the
1423 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1425 config CMDLINE_FORCE
1426 bool "Always use the default kernel command string"
1427 depends on CMDLINE != ""
1429 Always use the default kernel command string, even if the boot
1430 loader passes other arguments to the kernel.
1431 This is useful if you cannot or don't want to change the
1432 command-line options your boot loader passes to the kernel.
1437 bool "Kernel Execute-In-Place from ROM"
1438 depends on !ZBOOT_ROM
1440 Execute-In-Place allows the kernel to run from non-volatile storage
1441 directly addressable by the CPU, such as NOR flash. This saves RAM
1442 space since the text section of the kernel is not loaded from flash
1443 to RAM. Read-write sections, such as the data section and stack,
1444 are still copied to RAM. The XIP kernel is not compressed since
1445 it has to run directly from flash, so it will take more space to
1446 store it. The flash address used to link the kernel object files,
1447 and for storing it, is configuration dependent. Therefore, if you
1448 say Y here, you must know the proper physical address where to
1449 store the kernel image depending on your own flash memory usage.
1451 Also note that the make target becomes "make xipImage" rather than
1452 "make zImage" or "make Image". The final kernel binary to put in
1453 ROM memory will be arch/arm/boot/xipImage.
1457 config XIP_PHYS_ADDR
1458 hex "XIP Kernel Physical Location"
1459 depends on XIP_KERNEL
1460 default "0x00080000"
1462 This is the physical address in your flash memory the kernel will
1463 be linked for and stored to. This address is dependent on your
1467 bool "Kexec system call (EXPERIMENTAL)"
1468 depends on EXPERIMENTAL
1470 kexec is a system call that implements the ability to shutdown your
1471 current kernel, and to start another kernel. It is like a reboot
1472 but it is independent of the system firmware. And like a reboot
1473 you can start any kernel with it, not just Linux.
1475 It is an ongoing process to be certain the hardware in a machine
1476 is properly shutdown, so do not be surprised if this code does not
1477 initially work for you. It may help to enable device hotplugging
1481 bool "Export atags in procfs"
1485 Should the atags used to boot the kernel be exported in an "atags"
1486 file in procfs. Useful with kexec.
1490 menu "CPU Power Management"
1494 source "drivers/cpufreq/Kconfig"
1496 config CPU_FREQ_SA1100
1499 config CPU_FREQ_SA1110
1502 config CPU_FREQ_INTEGRATOR
1503 tristate "CPUfreq driver for ARM Integrator CPUs"
1504 depends on ARCH_INTEGRATOR && CPU_FREQ
1507 This enables the CPUfreq driver for ARM Integrator CPUs.
1509 For details, take a look at <file:Documentation/cpu-freq>.
1515 depends on CPU_FREQ && ARCH_PXA && PXA25x
1517 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1519 config CPU_FREQ_S3C64XX
1520 bool "CPUfreq support for Samsung S3C64XX CPUs"
1521 depends on CPU_FREQ && CPU_S3C6410
1526 Internal configuration node for common cpufreq on Samsung SoC
1528 config CPU_FREQ_S3C24XX
1529 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1530 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1533 This enables the CPUfreq driver for the Samsung S3C24XX family
1536 For details, take a look at <file:Documentation/cpu-freq>.
1540 config CPU_FREQ_S3C24XX_PLL
1541 bool "Support CPUfreq changing of PLL frequency"
1542 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1544 Compile in support for changing the PLL frequency from the
1545 S3C24XX series CPUfreq driver. The PLL takes time to settle
1546 after a frequency change, so by default it is not enabled.
1548 This also means that the PLL tables for the selected CPU(s) will
1549 be built which may increase the size of the kernel image.
1551 config CPU_FREQ_S3C24XX_DEBUG
1552 bool "Debug CPUfreq Samsung driver core"
1553 depends on CPU_FREQ_S3C24XX
1555 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1557 config CPU_FREQ_S3C24XX_IODEBUG
1558 bool "Debug CPUfreq Samsung driver IO timing"
1559 depends on CPU_FREQ_S3C24XX
1561 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1563 config CPU_FREQ_S3C24XX_DEBUGFS
1564 bool "Export debugfs for CPUFreq"
1565 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1567 Export status information via debugfs.
1571 source "drivers/cpuidle/Kconfig"
1575 menu "Floating point emulation"
1577 comment "At least one emulation must be selected"
1580 bool "NWFPE math emulation"
1581 depends on !AEABI || OABI_COMPAT
1583 Say Y to include the NWFPE floating point emulator in the kernel.
1584 This is necessary to run most binaries. Linux does not currently
1585 support floating point hardware so you need to say Y here even if
1586 your machine has an FPA or floating point co-processor podule.
1588 You may say N here if you are going to load the Acorn FPEmulator
1589 early in the bootup.
1592 bool "Support extended precision"
1593 depends on FPE_NWFPE
1595 Say Y to include 80-bit support in the kernel floating-point
1596 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1597 Note that gcc does not generate 80-bit operations by default,
1598 so in most cases this option only enlarges the size of the
1599 floating point emulator without any good reason.
1601 You almost surely want to say N here.
1604 bool "FastFPE math emulation (EXPERIMENTAL)"
1605 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1607 Say Y here to include the FAST floating point emulator in the kernel.
1608 This is an experimental much faster emulator which now also has full
1609 precision for the mantissa. It does not support any exceptions.
1610 It is very simple, and approximately 3-6 times faster than NWFPE.
1612 It should be sufficient for most programs. It may be not suitable
1613 for scientific calculations, but you have to check this for yourself.
1614 If you do not feel you need a faster FP emulation you should better
1618 bool "VFP-format floating point maths"
1619 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1621 Say Y to include VFP support code in the kernel. This is needed
1622 if your hardware includes a VFP unit.
1624 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1625 release notes and additional status information.
1627 Say N if your target does not have VFP hardware.
1635 bool "Advanced SIMD (NEON) Extension support"
1636 depends on VFPv3 && CPU_V7
1638 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1643 menu "Userspace binary formats"
1645 source "fs/Kconfig.binfmt"
1648 tristate "RISC OS personality"
1651 Say Y here to include the kernel code necessary if you want to run
1652 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1653 experimental; if this sounds frightening, say N and sleep in peace.
1654 You can also say M here to compile this support as a module (which
1655 will be called arthur).
1659 menu "Power management options"
1661 source "kernel/power/Kconfig"
1663 config ARCH_SUSPEND_POSSIBLE
1668 source "net/Kconfig"
1670 source "drivers/Kconfig"
1674 source "arch/arm/Kconfig.debug"
1676 source "security/Kconfig"
1678 source "crypto/Kconfig"
1680 source "lib/Kconfig"