4 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
5 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
6 select ARCH_HAVE_CUSTOM_GPIO_H
7 select ARCH_WANT_IPC_PARSE_VERSION
8 select BUILDTIME_EXTABLE_SORT if MMU
9 select CPU_PM if (SUSPEND || CPU_IDLE)
10 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
11 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
12 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
13 select GENERIC_IRQ_PROBE
14 select GENERIC_IRQ_SHOW
15 select GENERIC_PCI_IOMAP
16 select GENERIC_SMP_IDLE_THREAD
17 select GENERIC_STRNCPY_FROM_USER
18 select GENERIC_STRNLEN_USER
19 select HARDIRQS_SW_RESEND
21 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
23 select HAVE_ARCH_SECCOMP_FILTER
24 select HAVE_ARCH_TRACEHOOK
26 select HAVE_C_RECORDMCOUNT
27 select HAVE_DEBUG_KMEMLEAK
28 select HAVE_DMA_API_DEBUG
30 select HAVE_DMA_CONTIGUOUS if MMU
31 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
32 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
33 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
34 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
35 select HAVE_GENERIC_DMA_COHERENT
36 select HAVE_GENERIC_HARDIRQS
37 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
38 select HAVE_IDE if PCI || ISA || PCMCIA
40 select HAVE_KERNEL_GZIP
41 select HAVE_KERNEL_LZMA
42 select HAVE_KERNEL_LZO
44 select HAVE_KPROBES if !XIP_KERNEL
45 select HAVE_KRETPROBES if (HAVE_KPROBES)
47 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
48 select HAVE_PERF_EVENTS
49 select HAVE_REGS_AND_STACK_ACCESS_API
50 select HAVE_SYSCALL_TRACEPOINTS
53 select PERF_USE_VMALLOC
55 select SYS_SUPPORTS_APM_EMULATION
56 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
57 select MODULES_USE_ELF_REL
58 select CLONE_BACKWARDS
60 The ARM series is a line of low-power-consumption RISC chip designs
61 licensed by ARM Ltd and targeted at embedded applications and
62 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
63 manufactured, but legacy ARM-based PC hardware remains popular in
64 Europe. There is an ARM Linux project with a web page at
65 <http://www.arm.linux.org.uk/>.
67 config ARM_HAS_SG_CHAIN
70 config NEED_SG_DMA_LENGTH
73 config ARM_DMA_USE_IOMMU
75 select ARM_HAS_SG_CHAIN
76 select NEED_SG_DMA_LENGTH
84 config SYS_SUPPORTS_APM_EMULATION
92 select GENERIC_ALLOCATOR
103 The Extended Industry Standard Architecture (EISA) bus was
104 developed as an open alternative to the IBM MicroChannel bus.
106 The EISA bus provided some of the features of the IBM MicroChannel
107 bus while maintaining backward compatibility with cards made for
108 the older ISA bus. The EISA bus saw limited use between 1988 and
109 1995 when it was made obsolete by the PCI bus.
111 Say Y here if you are building a kernel for an EISA-based machine.
118 config STACKTRACE_SUPPORT
122 config HAVE_LATENCYTOP_SUPPORT
127 config LOCKDEP_SUPPORT
131 config TRACE_IRQFLAGS_SUPPORT
135 config RWSEM_GENERIC_SPINLOCK
139 config RWSEM_XCHGADD_ALGORITHM
142 config ARCH_HAS_ILOG2_U32
145 config ARCH_HAS_ILOG2_U64
148 config ARCH_HAS_CPUFREQ
151 Internal node to signify that the ARCH has CPUFREQ support
152 and that the relevant menu configurations are displayed for
155 config GENERIC_HWEIGHT
159 config GENERIC_CALIBRATE_DELAY
163 config ARCH_MAY_HAVE_PC_FDC
169 config NEED_DMA_MAP_STATE
172 config ARCH_HAS_DMA_SET_COHERENT_MASK
175 config GENERIC_ISA_DMA
181 config NEED_RET_TO_USER
189 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
190 default DRAM_BASE if REMAP_VECTORS_TO_RAM
193 The base address of exception vectors.
195 config ARM_PATCH_PHYS_VIRT
196 bool "Patch physical to virtual translations at runtime" if EMBEDDED
198 depends on !XIP_KERNEL && MMU
199 depends on !ARCH_REALVIEW || !SPARSEMEM
201 Patch phys-to-virt and virt-to-phys translation functions at
202 boot and module load time according to the position of the
203 kernel in system memory.
205 This can only be used with non-XIP MMU kernels where the base
206 of physical memory is at a 16MB boundary.
208 Only disable this option if you know that you do not require
209 this feature (eg, building a kernel for a single machine) and
210 you need to shrink the kernel to the minimal size.
212 config NEED_MACH_GPIO_H
215 Select this when mach/gpio.h is required to provide special
216 definitions for this platform. The need for mach/gpio.h should
217 be avoided when possible.
219 config NEED_MACH_IO_H
222 Select this when mach/io.h is required to provide special
223 definitions for this platform. The need for mach/io.h should
224 be avoided when possible.
226 config NEED_MACH_MEMORY_H
229 Select this when mach/memory.h is required to provide special
230 definitions for this platform. The need for mach/memory.h should
231 be avoided when possible.
234 hex "Physical address of main memory" if MMU
235 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
236 default DRAM_BASE if !MMU
238 Please provide the physical address corresponding to the
239 location of main memory in your system.
245 source "init/Kconfig"
247 source "kernel/Kconfig.freezer"
252 bool "MMU-based Paged Memory Management Support"
255 Select if you want MMU-based virtualised addressing space
256 support by paged memory management. If unsure, say 'Y'.
259 # The "ARM system type" choice list is ordered alphabetically by option
260 # text. Please add new entries in the option alphabetic order.
263 prompt "ARM system type"
264 default ARCH_MULTIPLATFORM
266 config ARCH_MULTIPLATFORM
267 bool "Allow multiple platforms to be selected"
269 select ARM_PATCH_PHYS_VIRT
272 select MULTI_IRQ_HANDLER
276 config ARCH_INTEGRATOR
277 bool "ARM Ltd. Integrator family"
278 select ARCH_HAS_CPUFREQ
281 select COMMON_CLK_VERSATILE
282 select GENERIC_CLOCKEVENTS
285 select MULTI_IRQ_HANDLER
286 select NEED_MACH_MEMORY_H
287 select PLAT_VERSATILE
289 select VERSATILE_FPGA_IRQ
291 Support for ARM's Integrator platform.
294 bool "ARM Ltd. RealView family"
295 select ARCH_WANT_OPTIONAL_GPIOLIB
297 select ARM_TIMER_SP804
299 select COMMON_CLK_VERSATILE
300 select GENERIC_CLOCKEVENTS
301 select GPIO_PL061 if GPIOLIB
303 select NEED_MACH_MEMORY_H
304 select PLAT_VERSATILE
305 select PLAT_VERSATILE_CLCD
307 This enables support for ARM Ltd RealView boards.
309 config ARCH_VERSATILE
310 bool "ARM Ltd. Versatile family"
311 select ARCH_WANT_OPTIONAL_GPIOLIB
313 select ARM_TIMER_SP804
316 select GENERIC_CLOCKEVENTS
317 select HAVE_MACH_CLKDEV
319 select PLAT_VERSATILE
320 select PLAT_VERSATILE_CLCD
321 select PLAT_VERSATILE_CLOCK
322 select VERSATILE_FPGA_IRQ
324 This enables support for ARM Ltd Versatile board.
328 select ARCH_REQUIRE_GPIOLIB
332 select NEED_MACH_GPIO_H
333 select NEED_MACH_IO_H if PCCARD
335 select PINCTRL_AT91 if USE_OF
337 This enables support for systems based on Atmel
338 AT91RM9200 and AT91SAM9* processors.
341 bool "Broadcom BCM2835 family"
342 select ARCH_REQUIRE_GPIOLIB
344 select ARM_ERRATA_411920
345 select ARM_TIMER_SP804
350 select GENERIC_CLOCKEVENTS
351 select MULTI_IRQ_HANDLER
353 select PINCTRL_BCM2835
357 This enables support for the Broadcom BCM2835 SoC. This SoC is
358 use in the Raspberry Pi, and Roku 2 devices.
361 bool "Cavium Networks CNS3XXX family"
364 select GENERIC_CLOCKEVENTS
365 select MIGHT_HAVE_CACHE_L2X0
366 select MIGHT_HAVE_PCI
367 select PCI_DOMAINS if PCI
369 Support for Cavium Networks CNS3XXX platform.
372 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
373 select ARCH_REQUIRE_GPIOLIB
378 select GENERIC_CLOCKEVENTS
379 select MULTI_IRQ_HANDLER
380 select NEED_MACH_MEMORY_H
383 Support for Cirrus Logic 711x/721x/731x based boards.
386 bool "Cortina Systems Gemini"
387 select ARCH_REQUIRE_GPIOLIB
388 select ARCH_USES_GETTIMEOFFSET
391 Support for the Cortina Systems Gemini family SoCs
395 select ARCH_REQUIRE_GPIOLIB
397 select GENERIC_CLOCKEVENTS
398 select GENERIC_IRQ_CHIP
399 select MIGHT_HAVE_CACHE_L2X0
405 Support for CSR SiRFprimaII/Marco/Polo platforms
409 select ARCH_USES_GETTIMEOFFSET
412 select NEED_MACH_IO_H
413 select NEED_MACH_MEMORY_H
416 This is an evaluation board for the StrongARM processor available
417 from Digital. It has limited hardware on-board, including an
418 Ethernet interface, two PCMCIA sockets, two serial ports and a
423 select ARCH_HAS_HOLES_MEMORYMODEL
424 select ARCH_REQUIRE_GPIOLIB
425 select ARCH_USES_GETTIMEOFFSET
430 select NEED_MACH_MEMORY_H
432 This enables support for the Cirrus EP93xx series of CPUs.
434 config ARCH_FOOTBRIDGE
438 select GENERIC_CLOCKEVENTS
440 select NEED_MACH_IO_H if !MMU
441 select NEED_MACH_MEMORY_H
443 Support for systems based on the DC21285 companion chip
444 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
447 bool "Freescale MXS-based"
448 select ARCH_REQUIRE_GPIOLIB
452 select GENERIC_CLOCKEVENTS
453 select HAVE_CLK_PREPARE
454 select MULTI_IRQ_HANDLER
459 Support for Freescale MXS-based family of processors
462 bool "Hilscher NetX based"
466 select GENERIC_CLOCKEVENTS
468 This enables support for systems based on the Hilscher NetX Soc
471 bool "Hynix HMS720x-based"
472 select ARCH_USES_GETTIMEOFFSET
476 This enables support for systems based on the Hynix HMS720x
481 select ARCH_SUPPORTS_MSI
483 select NEED_MACH_MEMORY_H
484 select NEED_RET_TO_USER
489 Support for Intel's IOP13XX (XScale) family of processors.
494 select ARCH_REQUIRE_GPIOLIB
496 select NEED_MACH_GPIO_H
497 select NEED_RET_TO_USER
501 Support for Intel's 80219 and IOP32X (XScale) family of
507 select ARCH_REQUIRE_GPIOLIB
509 select NEED_MACH_GPIO_H
510 select NEED_RET_TO_USER
514 Support for Intel's IOP33X (XScale) family of processors.
519 select ARCH_HAS_DMA_SET_COHERENT_MASK
520 select ARCH_REQUIRE_GPIOLIB
523 select DMABOUNCE if PCI
524 select GENERIC_CLOCKEVENTS
525 select MIGHT_HAVE_PCI
526 select NEED_MACH_IO_H
528 Support for Intel's IXP4XX (XScale) family of processors.
532 select ARCH_REQUIRE_GPIOLIB
533 select COMMON_CLK_DOVE
535 select GENERIC_CLOCKEVENTS
536 select MIGHT_HAVE_PCI
539 select PLAT_ORION_LEGACY
540 select USB_ARCH_HAS_EHCI
542 Support for the Marvell Dove SoC 88AP510
545 bool "Marvell Kirkwood"
546 select ARCH_REQUIRE_GPIOLIB
548 select GENERIC_CLOCKEVENTS
552 select PINCTRL_KIRKWOOD
553 select PLAT_ORION_LEGACY
555 Support for the following Marvell Kirkwood series SoCs:
556 88F6180, 88F6192 and 88F6281.
559 bool "Marvell MV78xx0"
560 select ARCH_REQUIRE_GPIOLIB
562 select GENERIC_CLOCKEVENTS
564 select PLAT_ORION_LEGACY
566 Support for the following Marvell MV78xx0 series SoCs:
572 select ARCH_REQUIRE_GPIOLIB
574 select GENERIC_CLOCKEVENTS
576 select PLAT_ORION_LEGACY
578 Support for the following Marvell Orion 5x series SoCs:
579 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
580 Orion-2 (5281), Orion-1-90 (6183).
583 bool "Marvell PXA168/910/MMP2"
585 select ARCH_REQUIRE_GPIOLIB
587 select GENERIC_ALLOCATOR
588 select GENERIC_CLOCKEVENTS
591 select NEED_MACH_GPIO_H
596 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
599 bool "Micrel/Kendin KS8695"
600 select ARCH_REQUIRE_GPIOLIB
603 select GENERIC_CLOCKEVENTS
604 select NEED_MACH_MEMORY_H
606 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
607 System-on-Chip devices.
610 bool "Nuvoton W90X900 CPU"
611 select ARCH_REQUIRE_GPIOLIB
615 select GENERIC_CLOCKEVENTS
617 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
618 At present, the w90x900 has been renamed nuc900, regarding
619 the ARM series product line, you can login the following
620 link address to know more.
622 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
623 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
627 select ARCH_REQUIRE_GPIOLIB
632 select GENERIC_CLOCKEVENTS
635 select USB_ARCH_HAS_OHCI
638 Support for the NXP LPC32XX family of processors
642 select ARCH_HAS_CPUFREQ
647 select GENERIC_CLOCKEVENTS
650 select MIGHT_HAVE_CACHE_L2X0
654 This enables support for NVIDIA Tegra based systems (Tegra APX,
655 Tegra 6xx and Tegra 2 series).
658 bool "PXA2xx/PXA3xx-based"
660 select ARCH_HAS_CPUFREQ
662 select ARCH_REQUIRE_GPIOLIB
663 select ARM_CPU_SUSPEND if PM
667 select GENERIC_CLOCKEVENTS
670 select MULTI_IRQ_HANDLER
671 select NEED_MACH_GPIO_H
675 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
679 select ARCH_REQUIRE_GPIOLIB
681 select GENERIC_CLOCKEVENTS
684 Support for Qualcomm MSM/QSD based systems. This runs on the
685 apps processor of the MSM/QSD and depends on a shared memory
686 interface to the modem processor which runs the baseband
687 stack and controls some vital subsystems
688 (clock and power control, etc).
691 bool "Renesas SH-Mobile / R-Mobile"
693 select GENERIC_CLOCKEVENTS
695 select HAVE_MACH_CLKDEV
697 select MIGHT_HAVE_CACHE_L2X0
698 select MULTI_IRQ_HANDLER
699 select NEED_MACH_MEMORY_H
701 select PM_GENERIC_DOMAINS if PM
704 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
709 select ARCH_MAY_HAVE_PC_FDC
710 select ARCH_SPARSEMEM_ENABLE
711 select ARCH_USES_GETTIMEOFFSET
714 select HAVE_PATA_PLATFORM
716 select NEED_MACH_IO_H
717 select NEED_MACH_MEMORY_H
720 On the Acorn Risc-PC, Linux can support the internal IDE disk and
721 CD-ROM interface, serial and parallel port, and the floppy drive.
725 select ARCH_HAS_CPUFREQ
727 select ARCH_REQUIRE_GPIOLIB
728 select ARCH_SPARSEMEM_ENABLE
733 select GENERIC_CLOCKEVENTS
736 select NEED_MACH_GPIO_H
737 select NEED_MACH_MEMORY_H
740 Support for StrongARM 11x0 based boards.
743 bool "Samsung S3C24XX SoCs"
744 select ARCH_HAS_CPUFREQ
745 select ARCH_USES_GETTIMEOFFSET
748 select HAVE_S3C2410_I2C if I2C
749 select HAVE_S3C2410_WATCHDOG if WATCHDOG
750 select HAVE_S3C_RTC if RTC_CLASS
751 select NEED_MACH_GPIO_H
752 select NEED_MACH_IO_H
754 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
755 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
756 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
757 Samsung SMDK2410 development board (and derivatives).
760 bool "Samsung S3C64XX"
761 select ARCH_HAS_CPUFREQ
762 select ARCH_REQUIRE_GPIOLIB
763 select ARCH_USES_GETTIMEOFFSET
768 select HAVE_S3C2410_I2C if I2C
769 select HAVE_S3C2410_WATCHDOG if WATCHDOG
771 select NEED_MACH_GPIO_H
775 select S3C_GPIO_TRACK
776 select SAMSUNG_CLKSRC
777 select SAMSUNG_GPIOLIB_4BIT
778 select SAMSUNG_IRQ_VIC_TIMER
779 select USB_ARCH_HAS_OHCI
781 Samsung S3C64XX series based systems
784 bool "Samsung S5P6440 S5P6450"
788 select GENERIC_CLOCKEVENTS
790 select HAVE_S3C2410_I2C if I2C
791 select HAVE_S3C2410_WATCHDOG if WATCHDOG
792 select HAVE_S3C_RTC if RTC_CLASS
793 select NEED_MACH_GPIO_H
795 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
799 bool "Samsung S5PC100"
800 select ARCH_USES_GETTIMEOFFSET
804 select HAVE_S3C2410_I2C if I2C
805 select HAVE_S3C2410_WATCHDOG if WATCHDOG
806 select HAVE_S3C_RTC if RTC_CLASS
807 select NEED_MACH_GPIO_H
809 Samsung S5PC100 series based systems
812 bool "Samsung S5PV210/S5PC110"
813 select ARCH_HAS_CPUFREQ
814 select ARCH_HAS_HOLES_MEMORYMODEL
815 select ARCH_SPARSEMEM_ENABLE
819 select GENERIC_CLOCKEVENTS
821 select HAVE_S3C2410_I2C if I2C
822 select HAVE_S3C2410_WATCHDOG if WATCHDOG
823 select HAVE_S3C_RTC if RTC_CLASS
824 select NEED_MACH_GPIO_H
825 select NEED_MACH_MEMORY_H
827 Samsung S5PV210/S5PC110 series based systems
830 bool "Samsung EXYNOS"
831 select ARCH_HAS_CPUFREQ
832 select ARCH_HAS_HOLES_MEMORYMODEL
833 select ARCH_SPARSEMEM_ENABLE
836 select GENERIC_CLOCKEVENTS
838 select HAVE_S3C2410_I2C if I2C
839 select HAVE_S3C2410_WATCHDOG if WATCHDOG
840 select HAVE_S3C_RTC if RTC_CLASS
841 select NEED_MACH_GPIO_H
842 select NEED_MACH_MEMORY_H
844 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
848 select ARCH_USES_GETTIMEOFFSET
852 select NEED_MACH_MEMORY_H
856 Support for the StrongARM based Digital DNARD machine, also known
857 as "Shark" (<http://www.shark-linux.de/shark.html>).
860 bool "ST-Ericsson U300 Series"
862 select ARCH_REQUIRE_GPIOLIB
864 select ARM_PATCH_PHYS_VIRT
870 select GENERIC_CLOCKEVENTS
874 Support for ST-Ericsson U300 series mobile platforms.
877 bool "ST-Ericsson U8500 Series"
879 select ARCH_HAS_CPUFREQ
880 select ARCH_REQUIRE_GPIOLIB
884 select GENERIC_CLOCKEVENTS
886 select MIGHT_HAVE_CACHE_L2X0
889 Support for ST-Ericsson's Ux500 architecture
892 bool "STMicroelectronics Nomadik"
893 select ARCH_REQUIRE_GPIOLIB
898 select GENERIC_CLOCKEVENTS
899 select MIGHT_HAVE_CACHE_L2X0
901 select PINCTRL_STN8815
904 Support for the Nomadik platform by ST-Ericsson
908 select ARCH_HAS_CPUFREQ
909 select ARCH_REQUIRE_GPIOLIB
914 select GENERIC_CLOCKEVENTS
917 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
921 select ARCH_HAS_HOLES_MEMORYMODEL
922 select ARCH_REQUIRE_GPIOLIB
924 select GENERIC_ALLOCATOR
925 select GENERIC_CLOCKEVENTS
926 select GENERIC_IRQ_CHIP
928 select NEED_MACH_GPIO_H
932 Support for TI's DaVinci platform.
937 select ARCH_HAS_CPUFREQ
938 select ARCH_HAS_HOLES_MEMORYMODEL
939 select ARCH_REQUIRE_GPIOLIB
941 select GENERIC_CLOCKEVENTS
944 Support for TI's OMAP platform (OMAP1/2/3/4).
946 config ARCH_VT8500_SINGLE
947 bool "VIA/WonderMedia 85xx"
948 select ARCH_HAS_CPUFREQ
949 select ARCH_REQUIRE_GPIOLIB
953 select GENERIC_CLOCKEVENTS
955 select MULTI_IRQ_HANDLER
959 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
963 menu "Multiple platform selection"
964 depends on ARCH_MULTIPLATFORM
966 comment "CPU Core family selection"
969 bool "ARMv4 based platforms (FA526, StrongARM)"
970 depends on !ARCH_MULTI_V6_V7
971 select ARCH_MULTI_V4_V5
973 config ARCH_MULTI_V4T
974 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
975 depends on !ARCH_MULTI_V6_V7
976 select ARCH_MULTI_V4_V5
979 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
980 depends on !ARCH_MULTI_V6_V7
981 select ARCH_MULTI_V4_V5
983 config ARCH_MULTI_V4_V5
987 bool "ARMv6 based platforms (ARM11, Scorpion, ...)"
988 select ARCH_MULTI_V6_V7
992 bool "ARMv7 based platforms (Cortex-A, PJ4, Krait)"
994 select ARCH_MULTI_V6_V7
998 config ARCH_MULTI_V6_V7
1001 config ARCH_MULTI_CPU_AUTO
1002 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
1003 select ARCH_MULTI_V5
1008 # This is sorted alphabetically by mach-* pathname. However, plat-*
1009 # Kconfigs may be included either alphabetically (according to the
1010 # plat- suffix) or along side the corresponding mach-* source.
1012 source "arch/arm/mach-mvebu/Kconfig"
1014 source "arch/arm/mach-at91/Kconfig"
1016 source "arch/arm/mach-bcm/Kconfig"
1018 source "arch/arm/mach-clps711x/Kconfig"
1020 source "arch/arm/mach-cns3xxx/Kconfig"
1022 source "arch/arm/mach-davinci/Kconfig"
1024 source "arch/arm/mach-dove/Kconfig"
1026 source "arch/arm/mach-ep93xx/Kconfig"
1028 source "arch/arm/mach-footbridge/Kconfig"
1030 source "arch/arm/mach-gemini/Kconfig"
1032 source "arch/arm/mach-h720x/Kconfig"
1034 source "arch/arm/mach-highbank/Kconfig"
1036 source "arch/arm/mach-integrator/Kconfig"
1038 source "arch/arm/mach-iop32x/Kconfig"
1040 source "arch/arm/mach-iop33x/Kconfig"
1042 source "arch/arm/mach-iop13xx/Kconfig"
1044 source "arch/arm/mach-ixp4xx/Kconfig"
1046 source "arch/arm/mach-kirkwood/Kconfig"
1048 source "arch/arm/mach-ks8695/Kconfig"
1050 source "arch/arm/mach-msm/Kconfig"
1052 source "arch/arm/mach-mv78xx0/Kconfig"
1054 source "arch/arm/mach-imx/Kconfig"
1056 source "arch/arm/mach-mxs/Kconfig"
1058 source "arch/arm/mach-netx/Kconfig"
1060 source "arch/arm/mach-nomadik/Kconfig"
1062 source "arch/arm/plat-omap/Kconfig"
1064 source "arch/arm/mach-omap1/Kconfig"
1066 source "arch/arm/mach-omap2/Kconfig"
1068 source "arch/arm/mach-orion5x/Kconfig"
1070 source "arch/arm/mach-picoxcell/Kconfig"
1072 source "arch/arm/mach-pxa/Kconfig"
1073 source "arch/arm/plat-pxa/Kconfig"
1075 source "arch/arm/mach-mmp/Kconfig"
1077 source "arch/arm/mach-realview/Kconfig"
1079 source "arch/arm/mach-sa1100/Kconfig"
1081 source "arch/arm/plat-samsung/Kconfig"
1083 source "arch/arm/mach-socfpga/Kconfig"
1085 source "arch/arm/plat-spear/Kconfig"
1087 source "arch/arm/mach-s3c24xx/Kconfig"
1090 source "arch/arm/mach-s3c64xx/Kconfig"
1093 source "arch/arm/mach-s5p64x0/Kconfig"
1095 source "arch/arm/mach-s5pc100/Kconfig"
1097 source "arch/arm/mach-s5pv210/Kconfig"
1099 source "arch/arm/mach-exynos/Kconfig"
1101 source "arch/arm/mach-shmobile/Kconfig"
1103 source "arch/arm/mach-sunxi/Kconfig"
1105 source "arch/arm/mach-prima2/Kconfig"
1107 source "arch/arm/mach-tegra/Kconfig"
1109 source "arch/arm/mach-u300/Kconfig"
1111 source "arch/arm/mach-ux500/Kconfig"
1113 source "arch/arm/mach-versatile/Kconfig"
1115 source "arch/arm/mach-vexpress/Kconfig"
1116 source "arch/arm/plat-versatile/Kconfig"
1118 source "arch/arm/mach-vt8500/Kconfig"
1120 source "arch/arm/mach-w90x900/Kconfig"
1122 source "arch/arm/mach-zynq/Kconfig"
1124 # Definitions to make life easier
1130 select GENERIC_CLOCKEVENTS
1136 select GENERIC_IRQ_CHIP
1139 config PLAT_ORION_LEGACY
1146 config PLAT_VERSATILE
1149 config ARM_TIMER_SP804
1152 select HAVE_SCHED_CLOCK
1154 source arch/arm/mm/Kconfig
1158 default 16 if ARCH_EP93XX
1162 bool "Enable iWMMXt support"
1163 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1164 default y if PXA27x || PXA3xx || ARCH_MMP
1166 Enable support for iWMMXt context switching at run time if
1167 running on a CPU that supports it.
1171 depends on CPU_XSCALE
1174 config MULTI_IRQ_HANDLER
1177 Allow each machine to specify it's own IRQ handler at run time.
1180 source "arch/arm/Kconfig-nommu"
1183 config ARM_ERRATA_326103
1184 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1187 Executing a SWP instruction to read-only memory does not set bit 11
1188 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1189 treat the access as a read, preventing a COW from occurring and
1190 causing the faulting task to livelock.
1192 config ARM_ERRATA_411920
1193 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1194 depends on CPU_V6 || CPU_V6K
1196 Invalidation of the Instruction Cache operation can
1197 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1198 It does not affect the MPCore. This option enables the ARM Ltd.
1199 recommended workaround.
1201 config ARM_ERRATA_430973
1202 bool "ARM errata: Stale prediction on replaced interworking branch"
1205 This option enables the workaround for the 430973 Cortex-A8
1206 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1207 interworking branch is replaced with another code sequence at the
1208 same virtual address, whether due to self-modifying code or virtual
1209 to physical address re-mapping, Cortex-A8 does not recover from the
1210 stale interworking branch prediction. This results in Cortex-A8
1211 executing the new code sequence in the incorrect ARM or Thumb state.
1212 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1213 and also flushes the branch target cache at every context switch.
1214 Note that setting specific bits in the ACTLR register may not be
1215 available in non-secure mode.
1217 config ARM_ERRATA_458693
1218 bool "ARM errata: Processor deadlock when a false hazard is created"
1220 depends on !ARCH_MULTIPLATFORM
1222 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1223 erratum. For very specific sequences of memory operations, it is
1224 possible for a hazard condition intended for a cache line to instead
1225 be incorrectly associated with a different cache line. This false
1226 hazard might then cause a processor deadlock. The workaround enables
1227 the L1 caching of the NEON accesses and disables the PLD instruction
1228 in the ACTLR register. Note that setting specific bits in the ACTLR
1229 register may not be available in non-secure mode.
1231 config ARM_ERRATA_460075
1232 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1234 depends on !ARCH_MULTIPLATFORM
1236 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1237 erratum. Any asynchronous access to the L2 cache may encounter a
1238 situation in which recent store transactions to the L2 cache are lost
1239 and overwritten with stale memory contents from external memory. The
1240 workaround disables the write-allocate mode for the L2 cache via the
1241 ACTLR register. Note that setting specific bits in the ACTLR register
1242 may not be available in non-secure mode.
1244 config ARM_ERRATA_742230
1245 bool "ARM errata: DMB operation may be faulty"
1246 depends on CPU_V7 && SMP
1247 depends on !ARCH_MULTIPLATFORM
1249 This option enables the workaround for the 742230 Cortex-A9
1250 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1251 between two write operations may not ensure the correct visibility
1252 ordering of the two writes. This workaround sets a specific bit in
1253 the diagnostic register of the Cortex-A9 which causes the DMB
1254 instruction to behave as a DSB, ensuring the correct behaviour of
1257 config ARM_ERRATA_742231
1258 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1259 depends on CPU_V7 && SMP
1260 depends on !ARCH_MULTIPLATFORM
1262 This option enables the workaround for the 742231 Cortex-A9
1263 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1264 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1265 accessing some data located in the same cache line, may get corrupted
1266 data due to bad handling of the address hazard when the line gets
1267 replaced from one of the CPUs at the same time as another CPU is
1268 accessing it. This workaround sets specific bits in the diagnostic
1269 register of the Cortex-A9 which reduces the linefill issuing
1270 capabilities of the processor.
1272 config PL310_ERRATA_588369
1273 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1274 depends on CACHE_L2X0
1276 The PL310 L2 cache controller implements three types of Clean &
1277 Invalidate maintenance operations: by Physical Address
1278 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1279 They are architecturally defined to behave as the execution of a
1280 clean operation followed immediately by an invalidate operation,
1281 both performing to the same memory location. This functionality
1282 is not correctly implemented in PL310 as clean lines are not
1283 invalidated as a result of these operations.
1285 config ARM_ERRATA_720789
1286 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1289 This option enables the workaround for the 720789 Cortex-A9 (prior to
1290 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1291 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1292 As a consequence of this erratum, some TLB entries which should be
1293 invalidated are not, resulting in an incoherency in the system page
1294 tables. The workaround changes the TLB flushing routines to invalidate
1295 entries regardless of the ASID.
1297 config PL310_ERRATA_727915
1298 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1299 depends on CACHE_L2X0
1301 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1302 operation (offset 0x7FC). This operation runs in background so that
1303 PL310 can handle normal accesses while it is in progress. Under very
1304 rare circumstances, due to this erratum, write data can be lost when
1305 PL310 treats a cacheable write transaction during a Clean &
1306 Invalidate by Way operation.
1308 config ARM_ERRATA_743622
1309 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1311 depends on !ARCH_MULTIPLATFORM
1313 This option enables the workaround for the 743622 Cortex-A9
1314 (r2p*) erratum. Under very rare conditions, a faulty
1315 optimisation in the Cortex-A9 Store Buffer may lead to data
1316 corruption. This workaround sets a specific bit in the diagnostic
1317 register of the Cortex-A9 which disables the Store Buffer
1318 optimisation, preventing the defect from occurring. This has no
1319 visible impact on the overall performance or power consumption of the
1322 config ARM_ERRATA_751472
1323 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1325 depends on !ARCH_MULTIPLATFORM
1327 This option enables the workaround for the 751472 Cortex-A9 (prior
1328 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1329 completion of a following broadcasted operation if the second
1330 operation is received by a CPU before the ICIALLUIS has completed,
1331 potentially leading to corrupted entries in the cache or TLB.
1333 config PL310_ERRATA_753970
1334 bool "PL310 errata: cache sync operation may be faulty"
1335 depends on CACHE_PL310
1337 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1339 Under some condition the effect of cache sync operation on
1340 the store buffer still remains when the operation completes.
1341 This means that the store buffer is always asked to drain and
1342 this prevents it from merging any further writes. The workaround
1343 is to replace the normal offset of cache sync operation (0x730)
1344 by another offset targeting an unmapped PL310 register 0x740.
1345 This has the same effect as the cache sync operation: store buffer
1346 drain and waiting for all buffers empty.
1348 config ARM_ERRATA_754322
1349 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1352 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1353 r3p*) erratum. A speculative memory access may cause a page table walk
1354 which starts prior to an ASID switch but completes afterwards. This
1355 can populate the micro-TLB with a stale entry which may be hit with
1356 the new ASID. This workaround places two dsb instructions in the mm
1357 switching code so that no page table walks can cross the ASID switch.
1359 config ARM_ERRATA_754327
1360 bool "ARM errata: no automatic Store Buffer drain"
1361 depends on CPU_V7 && SMP
1363 This option enables the workaround for the 754327 Cortex-A9 (prior to
1364 r2p0) erratum. The Store Buffer does not have any automatic draining
1365 mechanism and therefore a livelock may occur if an external agent
1366 continuously polls a memory location waiting to observe an update.
1367 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1368 written polling loops from denying visibility of updates to memory.
1370 config ARM_ERRATA_364296
1371 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1372 depends on CPU_V6 && !SMP
1374 This options enables the workaround for the 364296 ARM1136
1375 r0p2 erratum (possible cache data corruption with
1376 hit-under-miss enabled). It sets the undocumented bit 31 in
1377 the auxiliary control register and the FI bit in the control
1378 register, thus disabling hit-under-miss without putting the
1379 processor into full low interrupt latency mode. ARM11MPCore
1382 config ARM_ERRATA_764369
1383 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1384 depends on CPU_V7 && SMP
1386 This option enables the workaround for erratum 764369
1387 affecting Cortex-A9 MPCore with two or more processors (all
1388 current revisions). Under certain timing circumstances, a data
1389 cache line maintenance operation by MVA targeting an Inner
1390 Shareable memory region may fail to proceed up to either the
1391 Point of Coherency or to the Point of Unification of the
1392 system. This workaround adds a DSB instruction before the
1393 relevant cache maintenance functions and sets a specific bit
1394 in the diagnostic control register of the SCU.
1396 config PL310_ERRATA_769419
1397 bool "PL310 errata: no automatic Store Buffer drain"
1398 depends on CACHE_L2X0
1400 On revisions of the PL310 prior to r3p2, the Store Buffer does
1401 not automatically drain. This can cause normal, non-cacheable
1402 writes to be retained when the memory system is idle, leading
1403 to suboptimal I/O performance for drivers using coherent DMA.
1404 This option adds a write barrier to the cpu_idle loop so that,
1405 on systems with an outer cache, the store buffer is drained
1408 config ARM_ERRATA_775420
1409 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1412 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1413 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1414 operation aborts with MMU exception, it might cause the processor
1415 to deadlock. This workaround puts DSB before executing ISB if
1416 an abort may occur on cache maintenance.
1420 source "arch/arm/common/Kconfig"
1430 Find out whether you have ISA slots on your motherboard. ISA is the
1431 name of a bus system, i.e. the way the CPU talks to the other stuff
1432 inside your box. Other bus systems are PCI, EISA, MicroChannel
1433 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1434 newer boards don't support it. If you have ISA, say Y, otherwise N.
1436 # Select ISA DMA controller support
1441 # Select ISA DMA interface
1446 bool "PCI support" if MIGHT_HAVE_PCI
1448 Find out whether you have a PCI motherboard. PCI is the name of a
1449 bus system, i.e. the way the CPU talks to the other stuff inside
1450 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1451 VESA. If you have PCI, say Y, otherwise N.
1457 config PCI_NANOENGINE
1458 bool "BSE nanoEngine PCI support"
1459 depends on SA1100_NANOENGINE
1461 Enable PCI on the BSE nanoEngine board.
1466 # Select the host bridge type
1467 config PCI_HOST_VIA82C505
1469 depends on PCI && ARCH_SHARK
1472 config PCI_HOST_ITE8152
1474 depends on PCI && MACH_ARMCORE
1478 source "drivers/pci/Kconfig"
1480 source "drivers/pcmcia/Kconfig"
1484 menu "Kernel Features"
1489 This option should be selected by machines which have an SMP-
1492 The only effect of this option is to make the SMP-related
1493 options available to the user for configuration.
1496 bool "Symmetric Multi-Processing"
1497 depends on CPU_V6K || CPU_V7
1498 depends on GENERIC_CLOCKEVENTS
1501 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1502 select USE_GENERIC_SMP_HELPERS
1504 This enables support for systems with more than one CPU. If you have
1505 a system with only one CPU, like most personal computers, say N. If
1506 you have a system with more than one CPU, say Y.
1508 If you say N here, the kernel will run on single and multiprocessor
1509 machines, but will use only one CPU of a multiprocessor machine. If
1510 you say Y here, the kernel will run on many, but not all, single
1511 processor machines. On a single processor machine, the kernel will
1512 run faster if you say N here.
1514 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1515 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1516 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1518 If you don't know what to do here, say N.
1521 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1522 depends on EXPERIMENTAL
1523 depends on SMP && !XIP_KERNEL
1526 SMP kernels contain instructions which fail on non-SMP processors.
1527 Enabling this option allows the kernel to modify itself to make
1528 these instructions safe. Disabling it allows about 1K of space
1531 If you don't know what to do here, say Y.
1533 config ARM_CPU_TOPOLOGY
1534 bool "Support cpu topology definition"
1535 depends on SMP && CPU_V7
1538 Support ARM cpu topology definition. The MPIDR register defines
1539 affinity between processors which is then used to describe the cpu
1540 topology of an ARM System.
1543 bool "Multi-core scheduler support"
1544 depends on ARM_CPU_TOPOLOGY
1546 Multi-core scheduler support improves the CPU scheduler's decision
1547 making when dealing with multi-core CPU chips at a cost of slightly
1548 increased overhead in some places. If unsure say N here.
1551 bool "SMT scheduler support"
1552 depends on ARM_CPU_TOPOLOGY
1554 Improves the CPU scheduler's decision making when dealing with
1555 MultiThreading at a cost of slightly increased overhead in some
1556 places. If unsure say N here.
1561 This option enables support for the ARM system coherency unit
1563 config ARM_ARCH_TIMER
1564 bool "Architected timer support"
1567 This option enables support for the ARM architected timer
1573 This options enables support for the ARM timer and watchdog unit
1576 prompt "Memory split"
1579 Select the desired split between kernel and user memory.
1581 If you are not absolutely sure what you are doing, leave this
1585 bool "3G/1G user/kernel split"
1587 bool "2G/2G user/kernel split"
1589 bool "1G/3G user/kernel split"
1594 default 0x40000000 if VMSPLIT_1G
1595 default 0x80000000 if VMSPLIT_2G
1599 int "Maximum number of CPUs (2-32)"
1605 bool "Support for hot-pluggable CPUs"
1606 depends on SMP && HOTPLUG
1608 Say Y here to experiment with turning CPUs off and on. CPUs
1609 can be controlled through /sys/devices/system/cpu.
1612 bool "Use local timer interrupts"
1615 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1617 Enable support for local timers on SMP platforms, rather then the
1618 legacy IPI broadcast method. Local timers allows the system
1619 accounting to be spread across the timer interval, preventing a
1620 "thundering herd" at every timer tick.
1624 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1625 default 355 if ARCH_U8500
1626 default 264 if MACH_H4700
1627 default 512 if SOC_OMAP5
1628 default 288 if ARCH_VT8500
1631 Maximum number of GPIOs in the system.
1633 If unsure, leave the default value.
1635 source kernel/Kconfig.preempt
1639 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1640 ARCH_S5PV210 || ARCH_EXYNOS4
1641 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1642 default AT91_TIMER_HZ if ARCH_AT91
1643 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1646 config THUMB2_KERNEL
1647 bool "Compile the kernel in Thumb-2 mode"
1648 depends on CPU_V7 && !CPU_V6 && !CPU_V6K
1650 select ARM_ASM_UNIFIED
1653 By enabling this option, the kernel will be compiled in
1654 Thumb-2 mode. A compiler/assembler that understand the unified
1655 ARM-Thumb syntax is needed.
1659 config THUMB2_AVOID_R_ARM_THM_JUMP11
1660 bool "Work around buggy Thumb-2 short branch relocations in gas"
1661 depends on THUMB2_KERNEL && MODULES
1664 Various binutils versions can resolve Thumb-2 branches to
1665 locally-defined, preemptible global symbols as short-range "b.n"
1666 branch instructions.
1668 This is a problem, because there's no guarantee the final
1669 destination of the symbol, or any candidate locations for a
1670 trampoline, are within range of the branch. For this reason, the
1671 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1672 relocation in modules at all, and it makes little sense to add
1675 The symptom is that the kernel fails with an "unsupported
1676 relocation" error when loading some modules.
1678 Until fixed tools are available, passing
1679 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1680 code which hits this problem, at the cost of a bit of extra runtime
1681 stack usage in some cases.
1683 The problem is described in more detail at:
1684 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1686 Only Thumb-2 kernels are affected.
1688 Unless you are sure your tools don't have this problem, say Y.
1690 config ARM_ASM_UNIFIED
1694 bool "Use the ARM EABI to compile the kernel"
1696 This option allows for the kernel to be compiled using the latest
1697 ARM ABI (aka EABI). This is only useful if you are using a user
1698 space environment that is also compiled with EABI.
1700 Since there are major incompatibilities between the legacy ABI and
1701 EABI, especially with regard to structure member alignment, this
1702 option also changes the kernel syscall calling convention to
1703 disambiguate both ABIs and allow for backward compatibility support
1704 (selected with CONFIG_OABI_COMPAT).
1706 To use this you need GCC version 4.0.0 or later.
1709 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1710 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1713 This option preserves the old syscall interface along with the
1714 new (ARM EABI) one. It also provides a compatibility layer to
1715 intercept syscalls that have structure arguments which layout
1716 in memory differs between the legacy ABI and the new ARM EABI
1717 (only for non "thumb" binaries). This option adds a tiny
1718 overhead to all syscalls and produces a slightly larger kernel.
1719 If you know you'll be using only pure EABI user space then you
1720 can say N here. If this option is not selected and you attempt
1721 to execute a legacy ABI binary then the result will be
1722 UNPREDICTABLE (in fact it can be predicted that it won't work
1723 at all). If in doubt say Y.
1725 config ARCH_HAS_HOLES_MEMORYMODEL
1728 config ARCH_SPARSEMEM_ENABLE
1731 config ARCH_SPARSEMEM_DEFAULT
1732 def_bool ARCH_SPARSEMEM_ENABLE
1734 config ARCH_SELECT_MEMORY_MODEL
1735 def_bool ARCH_SPARSEMEM_ENABLE
1737 config HAVE_ARCH_PFN_VALID
1738 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1741 bool "High Memory Support"
1744 The address space of ARM processors is only 4 Gigabytes large
1745 and it has to accommodate user address space, kernel address
1746 space as well as some memory mapped IO. That means that, if you
1747 have a large amount of physical memory and/or IO, not all of the
1748 memory can be "permanently mapped" by the kernel. The physical
1749 memory that is not permanently mapped is called "high memory".
1751 Depending on the selected kernel/user memory split, minimum
1752 vmalloc space and actual amount of RAM, you may not need this
1753 option which should result in a slightly faster kernel.
1758 bool "Allocate 2nd-level pagetables from highmem"
1761 config HW_PERF_EVENTS
1762 bool "Enable hardware performance counter support for perf events"
1763 depends on PERF_EVENTS
1766 Enable hardware performance counter support for perf events. If
1767 disabled, perf events will use software events only.
1771 config FORCE_MAX_ZONEORDER
1772 int "Maximum zone order" if ARCH_SHMOBILE
1773 range 11 64 if ARCH_SHMOBILE
1774 default "12" if SOC_AM33XX
1775 default "9" if SA1111
1778 The kernel memory allocator divides physically contiguous memory
1779 blocks into "zones", where each zone is a power of two number of
1780 pages. This option selects the largest power of two that the kernel
1781 keeps in the memory allocator. If you need to allocate very large
1782 blocks of physically contiguous memory, then you may need to
1783 increase this value.
1785 This config option is actually maximum order plus one. For example,
1786 a value of 11 means that the largest free memory block is 2^10 pages.
1788 config ALIGNMENT_TRAP
1790 depends on CPU_CP15_MMU
1791 default y if !ARCH_EBSA110
1792 select HAVE_PROC_CPU if PROC_FS
1794 ARM processors cannot fetch/store information which is not
1795 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1796 address divisible by 4. On 32-bit ARM processors, these non-aligned
1797 fetch/store instructions will be emulated in software if you say
1798 here, which has a severe performance impact. This is necessary for
1799 correct operation of some network protocols. With an IP-only
1800 configuration it is safe to say N, otherwise say Y.
1802 config UACCESS_WITH_MEMCPY
1803 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1805 default y if CPU_FEROCEON
1807 Implement faster copy_to_user and clear_user methods for CPU
1808 cores where a 8-word STM instruction give significantly higher
1809 memory write throughput than a sequence of individual 32bit stores.
1811 A possible side effect is a slight increase in scheduling latency
1812 between threads sharing the same address space if they invoke
1813 such copy operations with large buffers.
1815 However, if the CPU data cache is using a write-allocate mode,
1816 this option is unlikely to provide any performance gain.
1820 prompt "Enable seccomp to safely compute untrusted bytecode"
1822 This kernel feature is useful for number crunching applications
1823 that may need to compute untrusted bytecode during their
1824 execution. By using pipes or other transports made available to
1825 the process as file descriptors supporting the read/write
1826 syscalls, it's possible to isolate those applications in
1827 their own address space using seccomp. Once seccomp is
1828 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1829 and the task is only allowed to execute a few safe syscalls
1830 defined by each seccomp mode.
1832 config CC_STACKPROTECTOR
1833 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1834 depends on EXPERIMENTAL
1836 This option turns on the -fstack-protector GCC feature. This
1837 feature puts, at the beginning of functions, a canary value on
1838 the stack just before the return address, and validates
1839 the value just before actually returning. Stack based buffer
1840 overflows (that need to overwrite this return address) now also
1841 overwrite the canary, which gets detected and the attack is then
1842 neutralized via a kernel panic.
1843 This feature requires gcc version 4.2 or above.
1850 bool "Xen guest support on ARM (EXPERIMENTAL)"
1851 depends on EXPERIMENTAL && ARM && OF
1852 depends on CPU_V7 && !CPU_V6
1854 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1861 bool "Flattened Device Tree support"
1864 select OF_EARLY_FLATTREE
1866 Include support for flattened device tree machine descriptions.
1869 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1872 This is the traditional way of passing data to the kernel at boot
1873 time. If you are solely relying on the flattened device tree (or
1874 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1875 to remove ATAGS support from your kernel binary. If unsure,
1878 config DEPRECATED_PARAM_STRUCT
1879 bool "Provide old way to pass kernel parameters"
1882 This was deprecated in 2001 and announced to live on for 5 years.
1883 Some old boot loaders still use this way.
1885 # Compressed boot loader in ROM. Yes, we really want to ask about
1886 # TEXT and BSS so we preserve their values in the config files.
1887 config ZBOOT_ROM_TEXT
1888 hex "Compressed ROM boot loader base address"
1891 The physical address at which the ROM-able zImage is to be
1892 placed in the target. Platforms which normally make use of
1893 ROM-able zImage formats normally set this to a suitable
1894 value in their defconfig file.
1896 If ZBOOT_ROM is not enabled, this has no effect.
1898 config ZBOOT_ROM_BSS
1899 hex "Compressed ROM boot loader BSS address"
1902 The base address of an area of read/write memory in the target
1903 for the ROM-able zImage which must be available while the
1904 decompressor is running. It must be large enough to hold the
1905 entire decompressed kernel plus an additional 128 KiB.
1906 Platforms which normally make use of ROM-able zImage formats
1907 normally set this to a suitable value in their defconfig file.
1909 If ZBOOT_ROM is not enabled, this has no effect.
1912 bool "Compressed boot loader in ROM/flash"
1913 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1915 Say Y here if you intend to execute your compressed kernel image
1916 (zImage) directly from ROM or flash. If unsure, say N.
1919 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1920 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1921 default ZBOOT_ROM_NONE
1923 Include experimental SD/MMC loading code in the ROM-able zImage.
1924 With this enabled it is possible to write the ROM-able zImage
1925 kernel image to an MMC or SD card and boot the kernel straight
1926 from the reset vector. At reset the processor Mask ROM will load
1927 the first part of the ROM-able zImage which in turn loads the
1928 rest the kernel image to RAM.
1930 config ZBOOT_ROM_NONE
1931 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1933 Do not load image from SD or MMC
1935 config ZBOOT_ROM_MMCIF
1936 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1938 Load image from MMCIF hardware block.
1940 config ZBOOT_ROM_SH_MOBILE_SDHI
1941 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1943 Load image from SDHI hardware block
1947 config ARM_APPENDED_DTB
1948 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1949 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1951 With this option, the boot code will look for a device tree binary
1952 (DTB) appended to zImage
1953 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1955 This is meant as a backward compatibility convenience for those
1956 systems with a bootloader that can't be upgraded to accommodate
1957 the documented boot protocol using a device tree.
1959 Beware that there is very little in terms of protection against
1960 this option being confused by leftover garbage in memory that might
1961 look like a DTB header after a reboot if no actual DTB is appended
1962 to zImage. Do not leave this option active in a production kernel
1963 if you don't intend to always append a DTB. Proper passing of the
1964 location into r2 of a bootloader provided DTB is always preferable
1967 config ARM_ATAG_DTB_COMPAT
1968 bool "Supplement the appended DTB with traditional ATAG information"
1969 depends on ARM_APPENDED_DTB
1971 Some old bootloaders can't be updated to a DTB capable one, yet
1972 they provide ATAGs with memory configuration, the ramdisk address,
1973 the kernel cmdline string, etc. Such information is dynamically
1974 provided by the bootloader and can't always be stored in a static
1975 DTB. To allow a device tree enabled kernel to be used with such
1976 bootloaders, this option allows zImage to extract the information
1977 from the ATAG list and store it at run time into the appended DTB.
1980 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1981 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1983 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1984 bool "Use bootloader kernel arguments if available"
1986 Uses the command-line options passed by the boot loader instead of
1987 the device tree bootargs property. If the boot loader doesn't provide
1988 any, the device tree bootargs property will be used.
1990 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1991 bool "Extend with bootloader kernel arguments"
1993 The command-line arguments provided by the boot loader will be
1994 appended to the the device tree bootargs property.
1999 string "Default kernel command string"
2002 On some architectures (EBSA110 and CATS), there is currently no way
2003 for the boot loader to pass arguments to the kernel. For these
2004 architectures, you should supply some command-line options at build
2005 time by entering them here. As a minimum, you should specify the
2006 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2009 prompt "Kernel command line type" if CMDLINE != ""
2010 default CMDLINE_FROM_BOOTLOADER
2013 config CMDLINE_FROM_BOOTLOADER
2014 bool "Use bootloader kernel arguments if available"
2016 Uses the command-line options passed by the boot loader. If
2017 the boot loader doesn't provide any, the default kernel command
2018 string provided in CMDLINE will be used.
2020 config CMDLINE_EXTEND
2021 bool "Extend bootloader kernel arguments"
2023 The command-line arguments provided by the boot loader will be
2024 appended to the default kernel command string.
2026 config CMDLINE_FORCE
2027 bool "Always use the default kernel command string"
2029 Always use the default kernel command string, even if the boot
2030 loader passes other arguments to the kernel.
2031 This is useful if you cannot or don't want to change the
2032 command-line options your boot loader passes to the kernel.
2036 bool "Kernel Execute-In-Place from ROM"
2037 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2039 Execute-In-Place allows the kernel to run from non-volatile storage
2040 directly addressable by the CPU, such as NOR flash. This saves RAM
2041 space since the text section of the kernel is not loaded from flash
2042 to RAM. Read-write sections, such as the data section and stack,
2043 are still copied to RAM. The XIP kernel is not compressed since
2044 it has to run directly from flash, so it will take more space to
2045 store it. The flash address used to link the kernel object files,
2046 and for storing it, is configuration dependent. Therefore, if you
2047 say Y here, you must know the proper physical address where to
2048 store the kernel image depending on your own flash memory usage.
2050 Also note that the make target becomes "make xipImage" rather than
2051 "make zImage" or "make Image". The final kernel binary to put in
2052 ROM memory will be arch/arm/boot/xipImage.
2056 config XIP_PHYS_ADDR
2057 hex "XIP Kernel Physical Location"
2058 depends on XIP_KERNEL
2059 default "0x00080000"
2061 This is the physical address in your flash memory the kernel will
2062 be linked for and stored to. This address is dependent on your
2066 bool "Kexec system call (EXPERIMENTAL)"
2067 depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
2069 kexec is a system call that implements the ability to shutdown your
2070 current kernel, and to start another kernel. It is like a reboot
2071 but it is independent of the system firmware. And like a reboot
2072 you can start any kernel with it, not just Linux.
2074 It is an ongoing process to be certain the hardware in a machine
2075 is properly shutdown, so do not be surprised if this code does not
2076 initially work for you. It may help to enable device hotplugging
2080 bool "Export atags in procfs"
2081 depends on ATAGS && KEXEC
2084 Should the atags used to boot the kernel be exported in an "atags"
2085 file in procfs. Useful with kexec.
2088 bool "Build kdump crash kernel (EXPERIMENTAL)"
2089 depends on EXPERIMENTAL
2091 Generate crash dump after being started by kexec. This should
2092 be normally only set in special crash dump kernels which are
2093 loaded in the main kernel with kexec-tools into a specially
2094 reserved region and then later executed after a crash by
2095 kdump/kexec. The crash dump kernel must be compiled to a
2096 memory address not used by the main kernel
2098 For more details see Documentation/kdump/kdump.txt
2100 config AUTO_ZRELADDR
2101 bool "Auto calculation of the decompressed kernel image address"
2102 depends on !ZBOOT_ROM && !ARCH_U300
2104 ZRELADDR is the physical address where the decompressed kernel
2105 image will be placed. If AUTO_ZRELADDR is selected, the address
2106 will be determined at run-time by masking the current IP with
2107 0xf8000000. This assumes the zImage being placed in the first 128MB
2108 from start of memory.
2112 menu "CPU Power Management"
2116 source "drivers/cpufreq/Kconfig"
2119 tristate "CPUfreq driver for i.MX CPUs"
2120 depends on ARCH_MXC && CPU_FREQ
2121 select CPU_FREQ_TABLE
2123 This enables the CPUfreq driver for i.MX CPUs.
2125 config CPU_FREQ_SA1100
2128 config CPU_FREQ_SA1110
2131 config CPU_FREQ_INTEGRATOR
2132 tristate "CPUfreq driver for ARM Integrator CPUs"
2133 depends on ARCH_INTEGRATOR && CPU_FREQ
2136 This enables the CPUfreq driver for ARM Integrator CPUs.
2138 For details, take a look at <file:Documentation/cpu-freq>.
2144 depends on CPU_FREQ && ARCH_PXA && PXA25x
2146 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2147 select CPU_FREQ_TABLE
2152 Internal configuration node for common cpufreq on Samsung SoC
2154 config CPU_FREQ_S3C24XX
2155 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2156 depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
2159 This enables the CPUfreq driver for the Samsung S3C24XX family
2162 For details, take a look at <file:Documentation/cpu-freq>.
2166 config CPU_FREQ_S3C24XX_PLL
2167 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2168 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2170 Compile in support for changing the PLL frequency from the
2171 S3C24XX series CPUfreq driver. The PLL takes time to settle
2172 after a frequency change, so by default it is not enabled.
2174 This also means that the PLL tables for the selected CPU(s) will
2175 be built which may increase the size of the kernel image.
2177 config CPU_FREQ_S3C24XX_DEBUG
2178 bool "Debug CPUfreq Samsung driver core"
2179 depends on CPU_FREQ_S3C24XX
2181 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2183 config CPU_FREQ_S3C24XX_IODEBUG
2184 bool "Debug CPUfreq Samsung driver IO timing"
2185 depends on CPU_FREQ_S3C24XX
2187 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2189 config CPU_FREQ_S3C24XX_DEBUGFS
2190 bool "Export debugfs for CPUFreq"
2191 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2193 Export status information via debugfs.
2197 source "drivers/cpuidle/Kconfig"
2201 menu "Floating point emulation"
2203 comment "At least one emulation must be selected"
2206 bool "NWFPE math emulation"
2207 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2209 Say Y to include the NWFPE floating point emulator in the kernel.
2210 This is necessary to run most binaries. Linux does not currently
2211 support floating point hardware so you need to say Y here even if
2212 your machine has an FPA or floating point co-processor podule.
2214 You may say N here if you are going to load the Acorn FPEmulator
2215 early in the bootup.
2218 bool "Support extended precision"
2219 depends on FPE_NWFPE
2221 Say Y to include 80-bit support in the kernel floating-point
2222 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2223 Note that gcc does not generate 80-bit operations by default,
2224 so in most cases this option only enlarges the size of the
2225 floating point emulator without any good reason.
2227 You almost surely want to say N here.
2230 bool "FastFPE math emulation (EXPERIMENTAL)"
2231 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2233 Say Y here to include the FAST floating point emulator in the kernel.
2234 This is an experimental much faster emulator which now also has full
2235 precision for the mantissa. It does not support any exceptions.
2236 It is very simple, and approximately 3-6 times faster than NWFPE.
2238 It should be sufficient for most programs. It may be not suitable
2239 for scientific calculations, but you have to check this for yourself.
2240 If you do not feel you need a faster FP emulation you should better
2244 bool "VFP-format floating point maths"
2245 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2247 Say Y to include VFP support code in the kernel. This is needed
2248 if your hardware includes a VFP unit.
2250 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2251 release notes and additional status information.
2253 Say N if your target does not have VFP hardware.
2261 bool "Advanced SIMD (NEON) Extension support"
2262 depends on VFPv3 && CPU_V7
2264 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2269 menu "Userspace binary formats"
2271 source "fs/Kconfig.binfmt"
2274 tristate "RISC OS personality"
2277 Say Y here to include the kernel code necessary if you want to run
2278 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2279 experimental; if this sounds frightening, say N and sleep in peace.
2280 You can also say M here to compile this support as a module (which
2281 will be called arthur).
2285 menu "Power management options"
2287 source "kernel/power/Kconfig"
2289 config ARCH_SUSPEND_POSSIBLE
2290 depends on !ARCH_S5PC100
2291 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2292 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2295 config ARM_CPU_SUSPEND
2300 source "net/Kconfig"
2302 source "drivers/Kconfig"
2306 source "arch/arm/Kconfig.debug"
2308 source "security/Kconfig"
2310 source "crypto/Kconfig"
2312 source "lib/Kconfig"