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 CPU_PM if (SUSPEND || CPU_IDLE)
9 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN
10 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
11 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
12 select GENERIC_IRQ_PROBE
13 select GENERIC_IRQ_SHOW
14 select GENERIC_KERNEL_THREAD
15 select GENERIC_KERNEL_EXECVE
16 select GENERIC_PCI_IOMAP
17 select GENERIC_SMP_IDLE_THREAD
18 select GENERIC_STRNCPY_FROM_USER
19 select GENERIC_STRNLEN_USER
20 select HARDIRQS_SW_RESEND
22 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
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
59 The ARM series is a line of low-power-consumption RISC chip designs
60 licensed by ARM Ltd and targeted at embedded applications and
61 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
62 manufactured, but legacy ARM-based PC hardware remains popular in
63 Europe. There is an ARM Linux project with a web page at
64 <http://www.arm.linux.org.uk/>.
66 config ARM_HAS_SG_CHAIN
69 config NEED_SG_DMA_LENGTH
72 config ARM_DMA_USE_IOMMU
74 select ARM_HAS_SG_CHAIN
75 select NEED_SG_DMA_LENGTH
83 config SYS_SUPPORTS_APM_EMULATION
91 select GENERIC_ALLOCATOR
102 The Extended Industry Standard Architecture (EISA) bus was
103 developed as an open alternative to the IBM MicroChannel bus.
105 The EISA bus provided some of the features of the IBM MicroChannel
106 bus while maintaining backward compatibility with cards made for
107 the older ISA bus. The EISA bus saw limited use between 1988 and
108 1995 when it was made obsolete by the PCI bus.
110 Say Y here if you are building a kernel for an EISA-based machine.
117 config STACKTRACE_SUPPORT
121 config HAVE_LATENCYTOP_SUPPORT
126 config LOCKDEP_SUPPORT
130 config TRACE_IRQFLAGS_SUPPORT
134 config RWSEM_GENERIC_SPINLOCK
138 config RWSEM_XCHGADD_ALGORITHM
141 config ARCH_HAS_ILOG2_U32
144 config ARCH_HAS_ILOG2_U64
147 config ARCH_HAS_CPUFREQ
150 Internal node to signify that the ARCH has CPUFREQ support
151 and that the relevant menu configurations are displayed for
154 config GENERIC_HWEIGHT
158 config GENERIC_CALIBRATE_DELAY
162 config ARCH_MAY_HAVE_PC_FDC
168 config NEED_DMA_MAP_STATE
171 config ARCH_HAS_DMA_SET_COHERENT_MASK
174 config GENERIC_ISA_DMA
180 config NEED_RET_TO_USER
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 config ARM_PATCH_PHYS_VIRT
195 bool "Patch physical to virtual translations at runtime" if EMBEDDED
197 depends on !XIP_KERNEL && MMU
198 depends on !ARCH_REALVIEW || !SPARSEMEM
200 Patch phys-to-virt and virt-to-phys translation functions at
201 boot and module load time according to the position of the
202 kernel in system memory.
204 This can only be used with non-XIP MMU kernels where the base
205 of physical memory is at a 16MB boundary.
207 Only disable this option if you know that you do not require
208 this feature (eg, building a kernel for a single machine) and
209 you need to shrink the kernel to the minimal size.
211 config NEED_MACH_GPIO_H
214 Select this when mach/gpio.h is required to provide special
215 definitions for this platform. The need for mach/gpio.h should
216 be avoided when possible.
218 config NEED_MACH_IO_H
221 Select this when mach/io.h is required to provide special
222 definitions for this platform. The need for mach/io.h should
223 be avoided when possible.
225 config NEED_MACH_MEMORY_H
228 Select this when mach/memory.h is required to provide special
229 definitions for this platform. The need for mach/memory.h should
230 be avoided when possible.
233 hex "Physical address of main memory" if MMU
234 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
235 default DRAM_BASE if !MMU
237 Please provide the physical address corresponding to the
238 location of main memory in your system.
244 source "init/Kconfig"
246 source "kernel/Kconfig.freezer"
251 bool "MMU-based Paged Memory Management Support"
254 Select if you want MMU-based virtualised addressing space
255 support by paged memory management. If unsure, say 'Y'.
258 # The "ARM system type" choice list is ordered alphabetically by option
259 # text. Please add new entries in the option alphabetic order.
262 prompt "ARM system type"
263 default ARCH_MULTIPLATFORM
265 config ARCH_MULTIPLATFORM
266 bool "Allow multiple platforms to be selected"
268 select ARM_PATCH_PHYS_VIRT
271 select MULTI_IRQ_HANDLER
275 config ARCH_INTEGRATOR
276 bool "ARM Ltd. Integrator family"
277 select ARCH_HAS_CPUFREQ
280 select COMMON_CLK_VERSATILE
281 select GENERIC_CLOCKEVENTS
284 select MULTI_IRQ_HANDLER
285 select NEED_MACH_MEMORY_H
286 select PLAT_VERSATILE
287 select PLAT_VERSATILE_FPGA_IRQ
290 Support for ARM's Integrator platform.
293 bool "ARM Ltd. RealView family"
294 select ARCH_WANT_OPTIONAL_GPIOLIB
296 select ARM_TIMER_SP804
298 select COMMON_CLK_VERSATILE
299 select GENERIC_CLOCKEVENTS
300 select GPIO_PL061 if GPIOLIB
302 select NEED_MACH_MEMORY_H
303 select PLAT_VERSATILE
304 select PLAT_VERSATILE_CLCD
306 This enables support for ARM Ltd RealView boards.
308 config ARCH_VERSATILE
309 bool "ARM Ltd. Versatile family"
310 select ARCH_WANT_OPTIONAL_GPIOLIB
312 select ARM_TIMER_SP804
315 select GENERIC_CLOCKEVENTS
316 select HAVE_MACH_CLKDEV
318 select PLAT_VERSATILE
319 select PLAT_VERSATILE_CLCD
320 select PLAT_VERSATILE_CLOCK
321 select PLAT_VERSATILE_FPGA_IRQ
323 This enables support for ARM Ltd Versatile board.
327 select ARCH_REQUIRE_GPIOLIB
331 select NEED_MACH_GPIO_H
332 select NEED_MACH_IO_H if PCCARD
334 select PINCTRL_AT91 if USE_OF
336 This enables support for systems based on Atmel
337 AT91RM9200 and AT91SAM9* processors.
340 bool "Broadcom BCM2835 family"
341 select ARCH_WANT_OPTIONAL_GPIOLIB
343 select ARM_ERRATA_411920
344 select ARM_TIMER_SP804
348 select GENERIC_CLOCKEVENTS
349 select MULTI_IRQ_HANDLER
353 This enables support for the Broadcom BCM2835 SoC. This SoC is
354 use in the Raspberry Pi, and Roku 2 devices.
357 bool "Cavium Networks CNS3XXX family"
360 select GENERIC_CLOCKEVENTS
361 select MIGHT_HAVE_CACHE_L2X0
362 select MIGHT_HAVE_PCI
363 select PCI_DOMAINS if PCI
365 Support for Cavium Networks CNS3XXX platform.
368 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
369 select ARCH_USES_GETTIMEOFFSET
373 select NEED_MACH_MEMORY_H
375 Support for Cirrus Logic 711x/721x/731x based boards.
378 bool "Cortina Systems Gemini"
379 select ARCH_REQUIRE_GPIOLIB
380 select ARCH_USES_GETTIMEOFFSET
383 Support for the Cortina Systems Gemini family SoCs
387 select ARCH_REQUIRE_GPIOLIB
389 select GENERIC_CLOCKEVENTS
390 select GENERIC_IRQ_CHIP
391 select MIGHT_HAVE_CACHE_L2X0
397 Support for CSR SiRFprimaII/Marco/Polo platforms
401 select ARCH_USES_GETTIMEOFFSET
404 select NEED_MACH_IO_H
405 select NEED_MACH_MEMORY_H
408 This is an evaluation board for the StrongARM processor available
409 from Digital. It has limited hardware on-board, including an
410 Ethernet interface, two PCMCIA sockets, two serial ports and a
415 select ARCH_HAS_HOLES_MEMORYMODEL
416 select ARCH_REQUIRE_GPIOLIB
417 select ARCH_USES_GETTIMEOFFSET
422 select NEED_MACH_MEMORY_H
424 This enables support for the Cirrus EP93xx series of CPUs.
426 config ARCH_FOOTBRIDGE
430 select GENERIC_CLOCKEVENTS
432 select NEED_MACH_IO_H if !MMU
433 select NEED_MACH_MEMORY_H
435 Support for systems based on the DC21285 companion chip
436 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
439 bool "Freescale MXC/iMX-based"
440 select ARCH_REQUIRE_GPIOLIB
443 select GENERIC_CLOCKEVENTS
444 select GENERIC_IRQ_CHIP
445 select MULTI_IRQ_HANDLER
449 Support for Freescale MXC/iMX-based family of processors
452 bool "Freescale MXS-based"
453 select ARCH_REQUIRE_GPIOLIB
457 select GENERIC_CLOCKEVENTS
458 select HAVE_CLK_PREPARE
459 select MULTI_IRQ_HANDLER
464 Support for Freescale MXS-based family of processors
467 bool "Hilscher NetX based"
471 select GENERIC_CLOCKEVENTS
473 This enables support for systems based on the Hilscher NetX Soc
476 bool "Hynix HMS720x-based"
477 select ARCH_USES_GETTIMEOFFSET
481 This enables support for systems based on the Hynix HMS720x
486 select ARCH_SUPPORTS_MSI
488 select NEED_MACH_MEMORY_H
489 select NEED_RET_TO_USER
494 Support for Intel's IOP13XX (XScale) family of processors.
499 select ARCH_REQUIRE_GPIOLIB
501 select NEED_MACH_GPIO_H
502 select NEED_RET_TO_USER
506 Support for Intel's 80219 and IOP32X (XScale) family of
512 select ARCH_REQUIRE_GPIOLIB
514 select NEED_MACH_GPIO_H
515 select NEED_RET_TO_USER
519 Support for Intel's IOP33X (XScale) family of processors.
524 select ARCH_HAS_DMA_SET_COHERENT_MASK
525 select ARCH_REQUIRE_GPIOLIB
528 select DMABOUNCE if PCI
529 select GENERIC_CLOCKEVENTS
530 select MIGHT_HAVE_PCI
531 select NEED_MACH_IO_H
533 Support for Intel's IXP4XX (XScale) family of processors.
537 select ARCH_REQUIRE_GPIOLIB
539 select GENERIC_CLOCKEVENTS
540 select MIGHT_HAVE_PCI
541 select PLAT_ORION_LEGACY
542 select USB_ARCH_HAS_EHCI
544 Support for the Marvell Dove SoC 88AP510
547 bool "Marvell Kirkwood"
548 select ARCH_REQUIRE_GPIOLIB
550 select GENERIC_CLOCKEVENTS
552 select PLAT_ORION_LEGACY
554 Support for the following Marvell Kirkwood series SoCs:
555 88F6180, 88F6192 and 88F6281.
558 bool "Marvell MV78xx0"
559 select ARCH_REQUIRE_GPIOLIB
561 select GENERIC_CLOCKEVENTS
563 select PLAT_ORION_LEGACY
565 Support for the following Marvell MV78xx0 series SoCs:
571 select ARCH_REQUIRE_GPIOLIB
573 select GENERIC_CLOCKEVENTS
575 select PLAT_ORION_LEGACY
577 Support for the following Marvell Orion 5x series SoCs:
578 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
579 Orion-2 (5281), Orion-1-90 (6183).
582 bool "Marvell PXA168/910/MMP2"
584 select ARCH_REQUIRE_GPIOLIB
586 select GENERIC_ALLOCATOR
587 select GENERIC_CLOCKEVENTS
590 select NEED_MACH_GPIO_H
594 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
597 bool "Micrel/Kendin KS8695"
598 select ARCH_REQUIRE_GPIOLIB
601 select GENERIC_CLOCKEVENTS
602 select NEED_MACH_MEMORY_H
604 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
605 System-on-Chip devices.
608 bool "Nuvoton W90X900 CPU"
609 select ARCH_REQUIRE_GPIOLIB
613 select GENERIC_CLOCKEVENTS
615 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
616 At present, the w90x900 has been renamed nuc900, regarding
617 the ARM series product line, you can login the following
618 link address to know more.
620 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
621 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
625 select ARCH_REQUIRE_GPIOLIB
630 select GENERIC_CLOCKEVENTS
633 select USB_ARCH_HAS_OHCI
636 Support for the NXP LPC32XX family of processors
640 select ARCH_HAS_CPUFREQ
644 select GENERIC_CLOCKEVENTS
648 select MIGHT_HAVE_CACHE_L2X0
651 This enables support for NVIDIA Tegra based systems (Tegra APX,
652 Tegra 6xx and Tegra 2 series).
655 bool "PXA2xx/PXA3xx-based"
657 select ARCH_HAS_CPUFREQ
659 select ARCH_REQUIRE_GPIOLIB
660 select ARM_CPU_SUSPEND if PM
664 select GENERIC_CLOCKEVENTS
667 select MULTI_IRQ_HANDLER
668 select NEED_MACH_GPIO_H
672 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
676 select ARCH_REQUIRE_GPIOLIB
678 select GENERIC_CLOCKEVENTS
681 Support for Qualcomm MSM/QSD based systems. This runs on the
682 apps processor of the MSM/QSD and depends on a shared memory
683 interface to the modem processor which runs the baseband
684 stack and controls some vital subsystems
685 (clock and power control, etc).
688 bool "Renesas SH-Mobile / R-Mobile"
690 select GENERIC_CLOCKEVENTS
692 select HAVE_MACH_CLKDEV
694 select MIGHT_HAVE_CACHE_L2X0
695 select MULTI_IRQ_HANDLER
696 select NEED_MACH_MEMORY_H
698 select PM_GENERIC_DOMAINS if PM
701 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
706 select ARCH_MAY_HAVE_PC_FDC
707 select ARCH_SPARSEMEM_ENABLE
708 select ARCH_USES_GETTIMEOFFSET
711 select HAVE_PATA_PLATFORM
713 select NEED_MACH_IO_H
714 select NEED_MACH_MEMORY_H
717 On the Acorn Risc-PC, Linux can support the internal IDE disk and
718 CD-ROM interface, serial and parallel port, and the floppy drive.
722 select ARCH_HAS_CPUFREQ
724 select ARCH_REQUIRE_GPIOLIB
725 select ARCH_SPARSEMEM_ENABLE
730 select GENERIC_CLOCKEVENTS
733 select NEED_MACH_GPIO_H
734 select NEED_MACH_MEMORY_H
737 Support for StrongARM 11x0 based boards.
740 bool "Samsung S3C24XX SoCs"
741 select ARCH_HAS_CPUFREQ
742 select ARCH_USES_GETTIMEOFFSET
746 select HAVE_S3C2410_I2C if I2C
747 select HAVE_S3C2410_WATCHDOG if WATCHDOG
748 select HAVE_S3C_RTC if RTC_CLASS
749 select NEED_MACH_GPIO_H
750 select NEED_MACH_IO_H
752 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
753 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
754 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
755 Samsung SMDK2410 development board (and derivatives).
758 bool "Samsung S3C64XX"
759 select ARCH_HAS_CPUFREQ
760 select ARCH_REQUIRE_GPIOLIB
761 select ARCH_USES_GETTIMEOFFSET
766 select HAVE_S3C2410_I2C if I2C
767 select HAVE_S3C2410_WATCHDOG if WATCHDOG
769 select NEED_MACH_GPIO_H
773 select S3C_GPIO_TRACK
774 select SAMSUNG_CLKSRC
775 select SAMSUNG_GPIOLIB_4BIT
776 select SAMSUNG_IRQ_VIC_TIMER
777 select USB_ARCH_HAS_OHCI
779 Samsung S3C64XX series based systems
782 bool "Samsung S5P6440 S5P6450"
786 select GENERIC_CLOCKEVENTS
789 select HAVE_S3C2410_I2C if I2C
790 select HAVE_S3C2410_WATCHDOG if WATCHDOG
791 select HAVE_S3C_RTC if RTC_CLASS
792 select NEED_MACH_GPIO_H
794 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
798 bool "Samsung S5PC100"
799 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
822 select HAVE_S3C2410_I2C if I2C
823 select HAVE_S3C2410_WATCHDOG if WATCHDOG
824 select HAVE_S3C_RTC if RTC_CLASS
825 select NEED_MACH_GPIO_H
826 select NEED_MACH_MEMORY_H
828 Samsung S5PV210/S5PC110 series based systems
831 bool "Samsung EXYNOS"
832 select ARCH_HAS_CPUFREQ
833 select ARCH_HAS_HOLES_MEMORYMODEL
834 select ARCH_SPARSEMEM_ENABLE
837 select GENERIC_CLOCKEVENTS
840 select HAVE_S3C2410_I2C if I2C
841 select HAVE_S3C2410_WATCHDOG if WATCHDOG
842 select HAVE_S3C_RTC if RTC_CLASS
843 select NEED_MACH_GPIO_H
844 select NEED_MACH_MEMORY_H
846 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
850 select ARCH_USES_GETTIMEOFFSET
854 select NEED_MACH_MEMORY_H
858 Support for the StrongARM based Digital DNARD machine, also known
859 as "Shark" (<http://www.shark-linux.de/shark.html>).
862 bool "ST-Ericsson U300 Series"
864 select ARCH_REQUIRE_GPIOLIB
866 select ARM_PATCH_PHYS_VIRT
872 select GENERIC_CLOCKEVENTS
877 Support for ST-Ericsson U300 series mobile platforms.
880 bool "ST-Ericsson U8500 Series"
882 select ARCH_HAS_CPUFREQ
883 select ARCH_REQUIRE_GPIOLIB
887 select GENERIC_CLOCKEVENTS
889 select MIGHT_HAVE_CACHE_L2X0
891 Support for ST-Ericsson's Ux500 architecture
894 bool "STMicroelectronics Nomadik"
895 select ARCH_REQUIRE_GPIOLIB
900 select GENERIC_CLOCKEVENTS
901 select MIGHT_HAVE_CACHE_L2X0
903 select PINCTRL_STN8815
905 Support for the Nomadik platform by ST-Ericsson
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
931 Support for TI's DaVinci platform.
936 select ARCH_HAS_CPUFREQ
937 select ARCH_HAS_HOLES_MEMORYMODEL
938 select ARCH_REQUIRE_GPIOLIB
940 select GENERIC_CLOCKEVENTS
942 select NEED_MACH_GPIO_H
944 Support for TI's OMAP platform (OMAP1/2/3/4).
947 bool "VIA/WonderMedia 85xx"
948 select ARCH_HAS_CPUFREQ
949 select ARCH_REQUIRE_GPIOLIB
953 select GENERIC_CLOCKEVENTS
958 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
961 bool "Xilinx Zynq ARM Cortex A9 Platform"
966 select GENERIC_CLOCKEVENTS
968 select MIGHT_HAVE_CACHE_L2X0
971 Support for Xilinx Zynq ARM Cortex A9 Platform
974 menu "Multiple platform selection"
975 depends on ARCH_MULTIPLATFORM
977 comment "CPU Core family selection"
980 bool "ARMv4 based platforms (FA526, StrongARM)"
981 depends on !ARCH_MULTI_V6_V7
982 select ARCH_MULTI_V4_V5
984 config ARCH_MULTI_V4T
985 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
986 depends on !ARCH_MULTI_V6_V7
987 select ARCH_MULTI_V4_V5
990 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
991 depends on !ARCH_MULTI_V6_V7
992 select ARCH_MULTI_V4_V5
994 config ARCH_MULTI_V4_V5
998 bool "ARMv6 based platforms (ARM11, Scorpion, ...)"
999 select ARCH_MULTI_V6_V7
1002 config ARCH_MULTI_V7
1003 bool "ARMv7 based platforms (Cortex-A, PJ4, Krait)"
1005 select ARCH_MULTI_V6_V7
1006 select ARCH_VEXPRESS
1009 config ARCH_MULTI_V6_V7
1012 config ARCH_MULTI_CPU_AUTO
1013 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
1014 select ARCH_MULTI_V5
1019 # This is sorted alphabetically by mach-* pathname. However, plat-*
1020 # Kconfigs may be included either alphabetically (according to the
1021 # plat- suffix) or along side the corresponding mach-* source.
1023 source "arch/arm/mach-mvebu/Kconfig"
1025 source "arch/arm/mach-at91/Kconfig"
1027 source "arch/arm/mach-clps711x/Kconfig"
1029 source "arch/arm/mach-cns3xxx/Kconfig"
1031 source "arch/arm/mach-davinci/Kconfig"
1033 source "arch/arm/mach-dove/Kconfig"
1035 source "arch/arm/mach-ep93xx/Kconfig"
1037 source "arch/arm/mach-footbridge/Kconfig"
1039 source "arch/arm/mach-gemini/Kconfig"
1041 source "arch/arm/mach-h720x/Kconfig"
1043 source "arch/arm/mach-highbank/Kconfig"
1045 source "arch/arm/mach-integrator/Kconfig"
1047 source "arch/arm/mach-iop32x/Kconfig"
1049 source "arch/arm/mach-iop33x/Kconfig"
1051 source "arch/arm/mach-iop13xx/Kconfig"
1053 source "arch/arm/mach-ixp4xx/Kconfig"
1055 source "arch/arm/mach-kirkwood/Kconfig"
1057 source "arch/arm/mach-ks8695/Kconfig"
1059 source "arch/arm/mach-msm/Kconfig"
1061 source "arch/arm/mach-mv78xx0/Kconfig"
1063 source "arch/arm/plat-mxc/Kconfig"
1065 source "arch/arm/mach-mxs/Kconfig"
1067 source "arch/arm/mach-netx/Kconfig"
1069 source "arch/arm/mach-nomadik/Kconfig"
1070 source "arch/arm/plat-nomadik/Kconfig"
1072 source "arch/arm/plat-omap/Kconfig"
1074 source "arch/arm/mach-omap1/Kconfig"
1076 source "arch/arm/mach-omap2/Kconfig"
1078 source "arch/arm/mach-orion5x/Kconfig"
1080 source "arch/arm/mach-picoxcell/Kconfig"
1082 source "arch/arm/mach-pxa/Kconfig"
1083 source "arch/arm/plat-pxa/Kconfig"
1085 source "arch/arm/mach-mmp/Kconfig"
1087 source "arch/arm/mach-realview/Kconfig"
1089 source "arch/arm/mach-sa1100/Kconfig"
1091 source "arch/arm/plat-samsung/Kconfig"
1092 source "arch/arm/plat-s3c24xx/Kconfig"
1094 source "arch/arm/mach-socfpga/Kconfig"
1096 source "arch/arm/plat-spear/Kconfig"
1098 source "arch/arm/mach-s3c24xx/Kconfig"
1100 source "arch/arm/mach-s3c2412/Kconfig"
1101 source "arch/arm/mach-s3c2440/Kconfig"
1105 source "arch/arm/mach-s3c64xx/Kconfig"
1108 source "arch/arm/mach-s5p64x0/Kconfig"
1110 source "arch/arm/mach-s5pc100/Kconfig"
1112 source "arch/arm/mach-s5pv210/Kconfig"
1114 source "arch/arm/mach-exynos/Kconfig"
1116 source "arch/arm/mach-shmobile/Kconfig"
1118 source "arch/arm/mach-prima2/Kconfig"
1120 source "arch/arm/mach-tegra/Kconfig"
1122 source "arch/arm/mach-u300/Kconfig"
1124 source "arch/arm/mach-ux500/Kconfig"
1126 source "arch/arm/mach-versatile/Kconfig"
1128 source "arch/arm/mach-vexpress/Kconfig"
1129 source "arch/arm/plat-versatile/Kconfig"
1131 source "arch/arm/mach-w90x900/Kconfig"
1133 # Definitions to make life easier
1139 select GENERIC_CLOCKEVENTS
1145 select GENERIC_IRQ_CHIP
1148 config PLAT_ORION_LEGACY
1155 config PLAT_VERSATILE
1158 config ARM_TIMER_SP804
1161 select HAVE_SCHED_CLOCK
1163 source arch/arm/mm/Kconfig
1167 default 16 if ARCH_EP93XX
1171 bool "Enable iWMMXt support"
1172 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1173 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1175 Enable support for iWMMXt context switching at run time if
1176 running on a CPU that supports it.
1180 depends on CPU_XSCALE
1183 config MULTI_IRQ_HANDLER
1186 Allow each machine to specify it's own IRQ handler at run time.
1189 source "arch/arm/Kconfig-nommu"
1192 config ARM_ERRATA_326103
1193 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1196 Executing a SWP instruction to read-only memory does not set bit 11
1197 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1198 treat the access as a read, preventing a COW from occurring and
1199 causing the faulting task to livelock.
1201 config ARM_ERRATA_411920
1202 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1203 depends on CPU_V6 || CPU_V6K
1205 Invalidation of the Instruction Cache operation can
1206 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1207 It does not affect the MPCore. This option enables the ARM Ltd.
1208 recommended workaround.
1210 config ARM_ERRATA_430973
1211 bool "ARM errata: Stale prediction on replaced interworking branch"
1214 This option enables the workaround for the 430973 Cortex-A8
1215 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1216 interworking branch is replaced with another code sequence at the
1217 same virtual address, whether due to self-modifying code or virtual
1218 to physical address re-mapping, Cortex-A8 does not recover from the
1219 stale interworking branch prediction. This results in Cortex-A8
1220 executing the new code sequence in the incorrect ARM or Thumb state.
1221 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1222 and also flushes the branch target cache at every context switch.
1223 Note that setting specific bits in the ACTLR register may not be
1224 available in non-secure mode.
1226 config ARM_ERRATA_458693
1227 bool "ARM errata: Processor deadlock when a false hazard is created"
1230 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1231 erratum. For very specific sequences of memory operations, it is
1232 possible for a hazard condition intended for a cache line to instead
1233 be incorrectly associated with a different cache line. This false
1234 hazard might then cause a processor deadlock. The workaround enables
1235 the L1 caching of the NEON accesses and disables the PLD instruction
1236 in the ACTLR register. Note that setting specific bits in the ACTLR
1237 register may not be available in non-secure mode.
1239 config ARM_ERRATA_460075
1240 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1243 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1244 erratum. Any asynchronous access to the L2 cache may encounter a
1245 situation in which recent store transactions to the L2 cache are lost
1246 and overwritten with stale memory contents from external memory. The
1247 workaround disables the write-allocate mode for the L2 cache via the
1248 ACTLR register. Note that setting specific bits in the ACTLR register
1249 may not be available in non-secure mode.
1251 config ARM_ERRATA_742230
1252 bool "ARM errata: DMB operation may be faulty"
1253 depends on CPU_V7 && SMP
1255 This option enables the workaround for the 742230 Cortex-A9
1256 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1257 between two write operations may not ensure the correct visibility
1258 ordering of the two writes. This workaround sets a specific bit in
1259 the diagnostic register of the Cortex-A9 which causes the DMB
1260 instruction to behave as a DSB, ensuring the correct behaviour of
1263 config ARM_ERRATA_742231
1264 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1265 depends on CPU_V7 && SMP
1267 This option enables the workaround for the 742231 Cortex-A9
1268 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1269 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1270 accessing some data located in the same cache line, may get corrupted
1271 data due to bad handling of the address hazard when the line gets
1272 replaced from one of the CPUs at the same time as another CPU is
1273 accessing it. This workaround sets specific bits in the diagnostic
1274 register of the Cortex-A9 which reduces the linefill issuing
1275 capabilities of the processor.
1277 config PL310_ERRATA_588369
1278 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1279 depends on CACHE_L2X0
1281 The PL310 L2 cache controller implements three types of Clean &
1282 Invalidate maintenance operations: by Physical Address
1283 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1284 They are architecturally defined to behave as the execution of a
1285 clean operation followed immediately by an invalidate operation,
1286 both performing to the same memory location. This functionality
1287 is not correctly implemented in PL310 as clean lines are not
1288 invalidated as a result of these operations.
1290 config ARM_ERRATA_720789
1291 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1294 This option enables the workaround for the 720789 Cortex-A9 (prior to
1295 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1296 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1297 As a consequence of this erratum, some TLB entries which should be
1298 invalidated are not, resulting in an incoherency in the system page
1299 tables. The workaround changes the TLB flushing routines to invalidate
1300 entries regardless of the ASID.
1302 config PL310_ERRATA_727915
1303 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1304 depends on CACHE_L2X0
1306 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1307 operation (offset 0x7FC). This operation runs in background so that
1308 PL310 can handle normal accesses while it is in progress. Under very
1309 rare circumstances, due to this erratum, write data can be lost when
1310 PL310 treats a cacheable write transaction during a Clean &
1311 Invalidate by Way operation.
1313 config ARM_ERRATA_743622
1314 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1317 This option enables the workaround for the 743622 Cortex-A9
1318 (r2p*) erratum. Under very rare conditions, a faulty
1319 optimisation in the Cortex-A9 Store Buffer may lead to data
1320 corruption. This workaround sets a specific bit in the diagnostic
1321 register of the Cortex-A9 which disables the Store Buffer
1322 optimisation, preventing the defect from occurring. This has no
1323 visible impact on the overall performance or power consumption of the
1326 config ARM_ERRATA_751472
1327 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1330 This option enables the workaround for the 751472 Cortex-A9 (prior
1331 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1332 completion of a following broadcasted operation if the second
1333 operation is received by a CPU before the ICIALLUIS has completed,
1334 potentially leading to corrupted entries in the cache or TLB.
1336 config PL310_ERRATA_753970
1337 bool "PL310 errata: cache sync operation may be faulty"
1338 depends on CACHE_PL310
1340 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1342 Under some condition the effect of cache sync operation on
1343 the store buffer still remains when the operation completes.
1344 This means that the store buffer is always asked to drain and
1345 this prevents it from merging any further writes. The workaround
1346 is to replace the normal offset of cache sync operation (0x730)
1347 by another offset targeting an unmapped PL310 register 0x740.
1348 This has the same effect as the cache sync operation: store buffer
1349 drain and waiting for all buffers empty.
1351 config ARM_ERRATA_754322
1352 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1355 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1356 r3p*) erratum. A speculative memory access may cause a page table walk
1357 which starts prior to an ASID switch but completes afterwards. This
1358 can populate the micro-TLB with a stale entry which may be hit with
1359 the new ASID. This workaround places two dsb instructions in the mm
1360 switching code so that no page table walks can cross the ASID switch.
1362 config ARM_ERRATA_754327
1363 bool "ARM errata: no automatic Store Buffer drain"
1364 depends on CPU_V7 && SMP
1366 This option enables the workaround for the 754327 Cortex-A9 (prior to
1367 r2p0) erratum. The Store Buffer does not have any automatic draining
1368 mechanism and therefore a livelock may occur if an external agent
1369 continuously polls a memory location waiting to observe an update.
1370 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1371 written polling loops from denying visibility of updates to memory.
1373 config ARM_ERRATA_364296
1374 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1375 depends on CPU_V6 && !SMP
1377 This options enables the workaround for the 364296 ARM1136
1378 r0p2 erratum (possible cache data corruption with
1379 hit-under-miss enabled). It sets the undocumented bit 31 in
1380 the auxiliary control register and the FI bit in the control
1381 register, thus disabling hit-under-miss without putting the
1382 processor into full low interrupt latency mode. ARM11MPCore
1385 config ARM_ERRATA_764369
1386 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1387 depends on CPU_V7 && SMP
1389 This option enables the workaround for erratum 764369
1390 affecting Cortex-A9 MPCore with two or more processors (all
1391 current revisions). Under certain timing circumstances, a data
1392 cache line maintenance operation by MVA targeting an Inner
1393 Shareable memory region may fail to proceed up to either the
1394 Point of Coherency or to the Point of Unification of the
1395 system. This workaround adds a DSB instruction before the
1396 relevant cache maintenance functions and sets a specific bit
1397 in the diagnostic control register of the SCU.
1399 config PL310_ERRATA_769419
1400 bool "PL310 errata: no automatic Store Buffer drain"
1401 depends on CACHE_L2X0
1403 On revisions of the PL310 prior to r3p2, the Store Buffer does
1404 not automatically drain. This can cause normal, non-cacheable
1405 writes to be retained when the memory system is idle, leading
1406 to suboptimal I/O performance for drivers using coherent DMA.
1407 This option adds a write barrier to the cpu_idle loop so that,
1408 on systems with an outer cache, the store buffer is drained
1411 config ARM_ERRATA_775420
1412 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1415 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1416 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1417 operation aborts with MMU exception, it might cause the processor
1418 to deadlock. This workaround puts DSB before executing ISB if
1419 an abort may occur on cache maintenance.
1423 source "arch/arm/common/Kconfig"
1433 Find out whether you have ISA slots on your motherboard. ISA is the
1434 name of a bus system, i.e. the way the CPU talks to the other stuff
1435 inside your box. Other bus systems are PCI, EISA, MicroChannel
1436 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1437 newer boards don't support it. If you have ISA, say Y, otherwise N.
1439 # Select ISA DMA controller support
1444 # Select ISA DMA interface
1449 bool "PCI support" if MIGHT_HAVE_PCI
1451 Find out whether you have a PCI motherboard. PCI is the name of a
1452 bus system, i.e. the way the CPU talks to the other stuff inside
1453 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1454 VESA. If you have PCI, say Y, otherwise N.
1460 config PCI_NANOENGINE
1461 bool "BSE nanoEngine PCI support"
1462 depends on SA1100_NANOENGINE
1464 Enable PCI on the BSE nanoEngine board.
1469 # Select the host bridge type
1470 config PCI_HOST_VIA82C505
1472 depends on PCI && ARCH_SHARK
1475 config PCI_HOST_ITE8152
1477 depends on PCI && MACH_ARMCORE
1481 source "drivers/pci/Kconfig"
1483 source "drivers/pcmcia/Kconfig"
1487 menu "Kernel Features"
1492 This option should be selected by machines which have an SMP-
1495 The only effect of this option is to make the SMP-related
1496 options available to the user for configuration.
1499 bool "Symmetric Multi-Processing"
1500 depends on CPU_V6K || CPU_V7
1501 depends on GENERIC_CLOCKEVENTS
1504 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1505 select USE_GENERIC_SMP_HELPERS
1507 This enables support for systems with more than one CPU. If you have
1508 a system with only one CPU, like most personal computers, say N. If
1509 you have a system with more than one CPU, say Y.
1511 If you say N here, the kernel will run on single and multiprocessor
1512 machines, but will use only one CPU of a multiprocessor machine. If
1513 you say Y here, the kernel will run on many, but not all, single
1514 processor machines. On a single processor machine, the kernel will
1515 run faster if you say N here.
1517 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1518 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1519 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1521 If you don't know what to do here, say N.
1524 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1525 depends on EXPERIMENTAL
1526 depends on SMP && !XIP_KERNEL
1529 SMP kernels contain instructions which fail on non-SMP processors.
1530 Enabling this option allows the kernel to modify itself to make
1531 these instructions safe. Disabling it allows about 1K of space
1534 If you don't know what to do here, say Y.
1536 config ARM_CPU_TOPOLOGY
1537 bool "Support cpu topology definition"
1538 depends on SMP && CPU_V7
1541 Support ARM cpu topology definition. The MPIDR register defines
1542 affinity between processors which is then used to describe the cpu
1543 topology of an ARM System.
1546 bool "Multi-core scheduler support"
1547 depends on ARM_CPU_TOPOLOGY
1549 Multi-core scheduler support improves the CPU scheduler's decision
1550 making when dealing with multi-core CPU chips at a cost of slightly
1551 increased overhead in some places. If unsure say N here.
1554 bool "SMT scheduler support"
1555 depends on ARM_CPU_TOPOLOGY
1557 Improves the CPU scheduler's decision making when dealing with
1558 MultiThreading at a cost of slightly increased overhead in some
1559 places. If unsure say N here.
1564 This option enables support for the ARM system coherency unit
1566 config ARM_ARCH_TIMER
1567 bool "Architected timer support"
1570 This option enables support for the ARM architected timer
1576 This options enables support for the ARM timer and watchdog unit
1579 prompt "Memory split"
1582 Select the desired split between kernel and user memory.
1584 If you are not absolutely sure what you are doing, leave this
1588 bool "3G/1G user/kernel split"
1590 bool "2G/2G user/kernel split"
1592 bool "1G/3G user/kernel split"
1597 default 0x40000000 if VMSPLIT_1G
1598 default 0x80000000 if VMSPLIT_2G
1602 int "Maximum number of CPUs (2-32)"
1608 bool "Support for hot-pluggable CPUs"
1609 depends on SMP && HOTPLUG
1611 Say Y here to experiment with turning CPUs off and on. CPUs
1612 can be controlled through /sys/devices/system/cpu.
1615 bool "Use local timer interrupts"
1618 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1620 Enable support for local timers on SMP platforms, rather then the
1621 legacy IPI broadcast method. Local timers allows the system
1622 accounting to be spread across the timer interval, preventing a
1623 "thundering herd" at every timer tick.
1627 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1628 default 355 if ARCH_U8500
1629 default 264 if MACH_H4700
1630 default 512 if SOC_OMAP5
1631 default 288 if ARCH_VT8500
1634 Maximum number of GPIOs in the system.
1636 If unsure, leave the default value.
1638 source kernel/Kconfig.preempt
1642 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1643 ARCH_S5PV210 || ARCH_EXYNOS4
1644 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1645 default AT91_TIMER_HZ if ARCH_AT91
1646 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1649 config THUMB2_KERNEL
1650 bool "Compile the kernel in Thumb-2 mode"
1651 depends on CPU_V7 && !CPU_V6 && !CPU_V6K
1653 select ARM_ASM_UNIFIED
1656 By enabling this option, the kernel will be compiled in
1657 Thumb-2 mode. A compiler/assembler that understand the unified
1658 ARM-Thumb syntax is needed.
1662 config THUMB2_AVOID_R_ARM_THM_JUMP11
1663 bool "Work around buggy Thumb-2 short branch relocations in gas"
1664 depends on THUMB2_KERNEL && MODULES
1667 Various binutils versions can resolve Thumb-2 branches to
1668 locally-defined, preemptible global symbols as short-range "b.n"
1669 branch instructions.
1671 This is a problem, because there's no guarantee the final
1672 destination of the symbol, or any candidate locations for a
1673 trampoline, are within range of the branch. For this reason, the
1674 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1675 relocation in modules at all, and it makes little sense to add
1678 The symptom is that the kernel fails with an "unsupported
1679 relocation" error when loading some modules.
1681 Until fixed tools are available, passing
1682 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1683 code which hits this problem, at the cost of a bit of extra runtime
1684 stack usage in some cases.
1686 The problem is described in more detail at:
1687 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1689 Only Thumb-2 kernels are affected.
1691 Unless you are sure your tools don't have this problem, say Y.
1693 config ARM_ASM_UNIFIED
1697 bool "Use the ARM EABI to compile the kernel"
1699 This option allows for the kernel to be compiled using the latest
1700 ARM ABI (aka EABI). This is only useful if you are using a user
1701 space environment that is also compiled with EABI.
1703 Since there are major incompatibilities between the legacy ABI and
1704 EABI, especially with regard to structure member alignment, this
1705 option also changes the kernel syscall calling convention to
1706 disambiguate both ABIs and allow for backward compatibility support
1707 (selected with CONFIG_OABI_COMPAT).
1709 To use this you need GCC version 4.0.0 or later.
1712 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1713 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1716 This option preserves the old syscall interface along with the
1717 new (ARM EABI) one. It also provides a compatibility layer to
1718 intercept syscalls that have structure arguments which layout
1719 in memory differs between the legacy ABI and the new ARM EABI
1720 (only for non "thumb" binaries). This option adds a tiny
1721 overhead to all syscalls and produces a slightly larger kernel.
1722 If you know you'll be using only pure EABI user space then you
1723 can say N here. If this option is not selected and you attempt
1724 to execute a legacy ABI binary then the result will be
1725 UNPREDICTABLE (in fact it can be predicted that it won't work
1726 at all). If in doubt say Y.
1728 config ARCH_HAS_HOLES_MEMORYMODEL
1731 config ARCH_SPARSEMEM_ENABLE
1734 config ARCH_SPARSEMEM_DEFAULT
1735 def_bool ARCH_SPARSEMEM_ENABLE
1737 config ARCH_SELECT_MEMORY_MODEL
1738 def_bool ARCH_SPARSEMEM_ENABLE
1740 config HAVE_ARCH_PFN_VALID
1741 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1744 bool "High Memory Support"
1747 The address space of ARM processors is only 4 Gigabytes large
1748 and it has to accommodate user address space, kernel address
1749 space as well as some memory mapped IO. That means that, if you
1750 have a large amount of physical memory and/or IO, not all of the
1751 memory can be "permanently mapped" by the kernel. The physical
1752 memory that is not permanently mapped is called "high memory".
1754 Depending on the selected kernel/user memory split, minimum
1755 vmalloc space and actual amount of RAM, you may not need this
1756 option which should result in a slightly faster kernel.
1761 bool "Allocate 2nd-level pagetables from highmem"
1764 config HW_PERF_EVENTS
1765 bool "Enable hardware performance counter support for perf events"
1766 depends on PERF_EVENTS
1769 Enable hardware performance counter support for perf events. If
1770 disabled, perf events will use software events only.
1774 config FORCE_MAX_ZONEORDER
1775 int "Maximum zone order" if ARCH_SHMOBILE
1776 range 11 64 if ARCH_SHMOBILE
1777 default "12" if SOC_AM33XX
1778 default "9" if SA1111
1781 The kernel memory allocator divides physically contiguous memory
1782 blocks into "zones", where each zone is a power of two number of
1783 pages. This option selects the largest power of two that the kernel
1784 keeps in the memory allocator. If you need to allocate very large
1785 blocks of physically contiguous memory, then you may need to
1786 increase this value.
1788 This config option is actually maximum order plus one. For example,
1789 a value of 11 means that the largest free memory block is 2^10 pages.
1791 config ALIGNMENT_TRAP
1793 depends on CPU_CP15_MMU
1794 default y if !ARCH_EBSA110
1795 select HAVE_PROC_CPU if PROC_FS
1797 ARM processors cannot fetch/store information which is not
1798 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1799 address divisible by 4. On 32-bit ARM processors, these non-aligned
1800 fetch/store instructions will be emulated in software if you say
1801 here, which has a severe performance impact. This is necessary for
1802 correct operation of some network protocols. With an IP-only
1803 configuration it is safe to say N, otherwise say Y.
1805 config UACCESS_WITH_MEMCPY
1806 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1808 default y if CPU_FEROCEON
1810 Implement faster copy_to_user and clear_user methods for CPU
1811 cores where a 8-word STM instruction give significantly higher
1812 memory write throughput than a sequence of individual 32bit stores.
1814 A possible side effect is a slight increase in scheduling latency
1815 between threads sharing the same address space if they invoke
1816 such copy operations with large buffers.
1818 However, if the CPU data cache is using a write-allocate mode,
1819 this option is unlikely to provide any performance gain.
1823 prompt "Enable seccomp to safely compute untrusted bytecode"
1825 This kernel feature is useful for number crunching applications
1826 that may need to compute untrusted bytecode during their
1827 execution. By using pipes or other transports made available to
1828 the process as file descriptors supporting the read/write
1829 syscalls, it's possible to isolate those applications in
1830 their own address space using seccomp. Once seccomp is
1831 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1832 and the task is only allowed to execute a few safe syscalls
1833 defined by each seccomp mode.
1835 config CC_STACKPROTECTOR
1836 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1837 depends on EXPERIMENTAL
1839 This option turns on the -fstack-protector GCC feature. This
1840 feature puts, at the beginning of functions, a canary value on
1841 the stack just before the return address, and validates
1842 the value just before actually returning. Stack based buffer
1843 overflows (that need to overwrite this return address) now also
1844 overwrite the canary, which gets detected and the attack is then
1845 neutralized via a kernel panic.
1846 This feature requires gcc version 4.2 or above.
1853 bool "Xen guest support on ARM (EXPERIMENTAL)"
1854 depends on EXPERIMENTAL && ARM && OF
1855 depends on CPU_V7 && !CPU_V6
1857 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1864 bool "Flattened Device Tree support"
1867 select OF_EARLY_FLATTREE
1869 Include support for flattened device tree machine descriptions.
1872 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1875 This is the traditional way of passing data to the kernel at boot
1876 time. If you are solely relying on the flattened device tree (or
1877 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1878 to remove ATAGS support from your kernel binary. If unsure,
1881 config DEPRECATED_PARAM_STRUCT
1882 bool "Provide old way to pass kernel parameters"
1885 This was deprecated in 2001 and announced to live on for 5 years.
1886 Some old boot loaders still use this way.
1888 # Compressed boot loader in ROM. Yes, we really want to ask about
1889 # TEXT and BSS so we preserve their values in the config files.
1890 config ZBOOT_ROM_TEXT
1891 hex "Compressed ROM boot loader base address"
1894 The physical address at which the ROM-able zImage is to be
1895 placed in the target. Platforms which normally make use of
1896 ROM-able zImage formats normally set this to a suitable
1897 value in their defconfig file.
1899 If ZBOOT_ROM is not enabled, this has no effect.
1901 config ZBOOT_ROM_BSS
1902 hex "Compressed ROM boot loader BSS address"
1905 The base address of an area of read/write memory in the target
1906 for the ROM-able zImage which must be available while the
1907 decompressor is running. It must be large enough to hold the
1908 entire decompressed kernel plus an additional 128 KiB.
1909 Platforms which normally make use of ROM-able zImage formats
1910 normally set this to a suitable value in their defconfig file.
1912 If ZBOOT_ROM is not enabled, this has no effect.
1915 bool "Compressed boot loader in ROM/flash"
1916 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1918 Say Y here if you intend to execute your compressed kernel image
1919 (zImage) directly from ROM or flash. If unsure, say N.
1922 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1923 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1924 default ZBOOT_ROM_NONE
1926 Include experimental SD/MMC loading code in the ROM-able zImage.
1927 With this enabled it is possible to write the ROM-able zImage
1928 kernel image to an MMC or SD card and boot the kernel straight
1929 from the reset vector. At reset the processor Mask ROM will load
1930 the first part of the ROM-able zImage which in turn loads the
1931 rest the kernel image to RAM.
1933 config ZBOOT_ROM_NONE
1934 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1936 Do not load image from SD or MMC
1938 config ZBOOT_ROM_MMCIF
1939 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1941 Load image from MMCIF hardware block.
1943 config ZBOOT_ROM_SH_MOBILE_SDHI
1944 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1946 Load image from SDHI hardware block
1950 config ARM_APPENDED_DTB
1951 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1952 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1954 With this option, the boot code will look for a device tree binary
1955 (DTB) appended to zImage
1956 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1958 This is meant as a backward compatibility convenience for those
1959 systems with a bootloader that can't be upgraded to accommodate
1960 the documented boot protocol using a device tree.
1962 Beware that there is very little in terms of protection against
1963 this option being confused by leftover garbage in memory that might
1964 look like a DTB header after a reboot if no actual DTB is appended
1965 to zImage. Do not leave this option active in a production kernel
1966 if you don't intend to always append a DTB. Proper passing of the
1967 location into r2 of a bootloader provided DTB is always preferable
1970 config ARM_ATAG_DTB_COMPAT
1971 bool "Supplement the appended DTB with traditional ATAG information"
1972 depends on ARM_APPENDED_DTB
1974 Some old bootloaders can't be updated to a DTB capable one, yet
1975 they provide ATAGs with memory configuration, the ramdisk address,
1976 the kernel cmdline string, etc. Such information is dynamically
1977 provided by the bootloader and can't always be stored in a static
1978 DTB. To allow a device tree enabled kernel to be used with such
1979 bootloaders, this option allows zImage to extract the information
1980 from the ATAG list and store it at run time into the appended DTB.
1983 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1984 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1986 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1987 bool "Use bootloader kernel arguments if available"
1989 Uses the command-line options passed by the boot loader instead of
1990 the device tree bootargs property. If the boot loader doesn't provide
1991 any, the device tree bootargs property will be used.
1993 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1994 bool "Extend with bootloader kernel arguments"
1996 The command-line arguments provided by the boot loader will be
1997 appended to the the device tree bootargs property.
2002 string "Default kernel command string"
2005 On some architectures (EBSA110 and CATS), there is currently no way
2006 for the boot loader to pass arguments to the kernel. For these
2007 architectures, you should supply some command-line options at build
2008 time by entering them here. As a minimum, you should specify the
2009 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2012 prompt "Kernel command line type" if CMDLINE != ""
2013 default CMDLINE_FROM_BOOTLOADER
2016 config CMDLINE_FROM_BOOTLOADER
2017 bool "Use bootloader kernel arguments if available"
2019 Uses the command-line options passed by the boot loader. If
2020 the boot loader doesn't provide any, the default kernel command
2021 string provided in CMDLINE will be used.
2023 config CMDLINE_EXTEND
2024 bool "Extend bootloader kernel arguments"
2026 The command-line arguments provided by the boot loader will be
2027 appended to the default kernel command string.
2029 config CMDLINE_FORCE
2030 bool "Always use the default kernel command string"
2032 Always use the default kernel command string, even if the boot
2033 loader passes other arguments to the kernel.
2034 This is useful if you cannot or don't want to change the
2035 command-line options your boot loader passes to the kernel.
2039 bool "Kernel Execute-In-Place from ROM"
2040 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2042 Execute-In-Place allows the kernel to run from non-volatile storage
2043 directly addressable by the CPU, such as NOR flash. This saves RAM
2044 space since the text section of the kernel is not loaded from flash
2045 to RAM. Read-write sections, such as the data section and stack,
2046 are still copied to RAM. The XIP kernel is not compressed since
2047 it has to run directly from flash, so it will take more space to
2048 store it. The flash address used to link the kernel object files,
2049 and for storing it, is configuration dependent. Therefore, if you
2050 say Y here, you must know the proper physical address where to
2051 store the kernel image depending on your own flash memory usage.
2053 Also note that the make target becomes "make xipImage" rather than
2054 "make zImage" or "make Image". The final kernel binary to put in
2055 ROM memory will be arch/arm/boot/xipImage.
2059 config XIP_PHYS_ADDR
2060 hex "XIP Kernel Physical Location"
2061 depends on XIP_KERNEL
2062 default "0x00080000"
2064 This is the physical address in your flash memory the kernel will
2065 be linked for and stored to. This address is dependent on your
2069 bool "Kexec system call (EXPERIMENTAL)"
2070 depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
2072 kexec is a system call that implements the ability to shutdown your
2073 current kernel, and to start another kernel. It is like a reboot
2074 but it is independent of the system firmware. And like a reboot
2075 you can start any kernel with it, not just Linux.
2077 It is an ongoing process to be certain the hardware in a machine
2078 is properly shutdown, so do not be surprised if this code does not
2079 initially work for you. It may help to enable device hotplugging
2083 bool "Export atags in procfs"
2084 depends on ATAGS && KEXEC
2087 Should the atags used to boot the kernel be exported in an "atags"
2088 file in procfs. Useful with kexec.
2091 bool "Build kdump crash kernel (EXPERIMENTAL)"
2092 depends on EXPERIMENTAL
2094 Generate crash dump after being started by kexec. This should
2095 be normally only set in special crash dump kernels which are
2096 loaded in the main kernel with kexec-tools into a specially
2097 reserved region and then later executed after a crash by
2098 kdump/kexec. The crash dump kernel must be compiled to a
2099 memory address not used by the main kernel
2101 For more details see Documentation/kdump/kdump.txt
2103 config AUTO_ZRELADDR
2104 bool "Auto calculation of the decompressed kernel image address"
2105 depends on !ZBOOT_ROM && !ARCH_U300
2107 ZRELADDR is the physical address where the decompressed kernel
2108 image will be placed. If AUTO_ZRELADDR is selected, the address
2109 will be determined at run-time by masking the current IP with
2110 0xf8000000. This assumes the zImage being placed in the first 128MB
2111 from start of memory.
2115 menu "CPU Power Management"
2119 source "drivers/cpufreq/Kconfig"
2122 tristate "CPUfreq driver for i.MX CPUs"
2123 depends on ARCH_MXC && CPU_FREQ
2124 select CPU_FREQ_TABLE
2126 This enables the CPUfreq driver for i.MX CPUs.
2128 config CPU_FREQ_SA1100
2131 config CPU_FREQ_SA1110
2134 config CPU_FREQ_INTEGRATOR
2135 tristate "CPUfreq driver for ARM Integrator CPUs"
2136 depends on ARCH_INTEGRATOR && CPU_FREQ
2139 This enables the CPUfreq driver for ARM Integrator CPUs.
2141 For details, take a look at <file:Documentation/cpu-freq>.
2147 depends on CPU_FREQ && ARCH_PXA && PXA25x
2149 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2150 select CPU_FREQ_TABLE
2155 Internal configuration node for common cpufreq on Samsung SoC
2157 config CPU_FREQ_S3C24XX
2158 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2159 depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
2162 This enables the CPUfreq driver for the Samsung S3C24XX family
2165 For details, take a look at <file:Documentation/cpu-freq>.
2169 config CPU_FREQ_S3C24XX_PLL
2170 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2171 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2173 Compile in support for changing the PLL frequency from the
2174 S3C24XX series CPUfreq driver. The PLL takes time to settle
2175 after a frequency change, so by default it is not enabled.
2177 This also means that the PLL tables for the selected CPU(s) will
2178 be built which may increase the size of the kernel image.
2180 config CPU_FREQ_S3C24XX_DEBUG
2181 bool "Debug CPUfreq Samsung driver core"
2182 depends on CPU_FREQ_S3C24XX
2184 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2186 config CPU_FREQ_S3C24XX_IODEBUG
2187 bool "Debug CPUfreq Samsung driver IO timing"
2188 depends on CPU_FREQ_S3C24XX
2190 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2192 config CPU_FREQ_S3C24XX_DEBUGFS
2193 bool "Export debugfs for CPUFreq"
2194 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2196 Export status information via debugfs.
2200 source "drivers/cpuidle/Kconfig"
2204 menu "Floating point emulation"
2206 comment "At least one emulation must be selected"
2209 bool "NWFPE math emulation"
2210 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2212 Say Y to include the NWFPE floating point emulator in the kernel.
2213 This is necessary to run most binaries. Linux does not currently
2214 support floating point hardware so you need to say Y here even if
2215 your machine has an FPA or floating point co-processor podule.
2217 You may say N here if you are going to load the Acorn FPEmulator
2218 early in the bootup.
2221 bool "Support extended precision"
2222 depends on FPE_NWFPE
2224 Say Y to include 80-bit support in the kernel floating-point
2225 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2226 Note that gcc does not generate 80-bit operations by default,
2227 so in most cases this option only enlarges the size of the
2228 floating point emulator without any good reason.
2230 You almost surely want to say N here.
2233 bool "FastFPE math emulation (EXPERIMENTAL)"
2234 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2236 Say Y here to include the FAST floating point emulator in the kernel.
2237 This is an experimental much faster emulator which now also has full
2238 precision for the mantissa. It does not support any exceptions.
2239 It is very simple, and approximately 3-6 times faster than NWFPE.
2241 It should be sufficient for most programs. It may be not suitable
2242 for scientific calculations, but you have to check this for yourself.
2243 If you do not feel you need a faster FP emulation you should better
2247 bool "VFP-format floating point maths"
2248 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2250 Say Y to include VFP support code in the kernel. This is needed
2251 if your hardware includes a VFP unit.
2253 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2254 release notes and additional status information.
2256 Say N if your target does not have VFP hardware.
2264 bool "Advanced SIMD (NEON) Extension support"
2265 depends on VFPv3 && CPU_V7
2267 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2272 menu "Userspace binary formats"
2274 source "fs/Kconfig.binfmt"
2277 tristate "RISC OS personality"
2280 Say Y here to include the kernel code necessary if you want to run
2281 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2282 experimental; if this sounds frightening, say N and sleep in peace.
2283 You can also say M here to compile this support as a module (which
2284 will be called arthur).
2288 menu "Power management options"
2290 source "kernel/power/Kconfig"
2292 config ARCH_SUSPEND_POSSIBLE
2293 depends on !ARCH_S5PC100
2294 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2295 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2298 config ARM_CPU_SUSPEND
2303 source "net/Kconfig"
2305 source "drivers/Kconfig"
2309 source "arch/arm/Kconfig.debug"
2311 source "security/Kconfig"
2313 source "crypto/Kconfig"
2315 source "lib/Kconfig"