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_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
8 select ARCH_WANT_IPC_PARSE_VERSION
9 select BUILDTIME_EXTABLE_SORT if MMU
10 select CPU_PM if (SUSPEND || CPU_IDLE)
11 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
12 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
13 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
14 select GENERIC_IRQ_PROBE
15 select GENERIC_IRQ_SHOW
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_SECCOMP_FILTER
25 select HAVE_ARCH_TRACEHOOK
27 select HAVE_C_RECORDMCOUNT
28 select HAVE_DEBUG_KMEMLEAK
29 select HAVE_DMA_API_DEBUG
31 select HAVE_DMA_CONTIGUOUS if MMU
32 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
33 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
34 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
35 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
36 select HAVE_GENERIC_DMA_COHERENT
37 select HAVE_GENERIC_HARDIRQS
38 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
39 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
59 select OLD_SIGSUSPEND3
62 The ARM series is a line of low-power-consumption RISC chip designs
63 licensed by ARM Ltd and targeted at embedded applications and
64 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
65 manufactured, but legacy ARM-based PC hardware remains popular in
66 Europe. There is an ARM Linux project with a web page at
67 <http://www.arm.linux.org.uk/>.
69 config ARM_HAS_SG_CHAIN
72 config NEED_SG_DMA_LENGTH
75 config ARM_DMA_USE_IOMMU
77 select ARM_HAS_SG_CHAIN
78 select NEED_SG_DMA_LENGTH
82 config ARM_DMA_IOMMU_ALIGNMENT
83 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
87 DMA mapping framework by default aligns all buffers to the smallest
88 PAGE_SIZE order which is greater than or equal to the requested buffer
89 size. This works well for buffers up to a few hundreds kilobytes, but
90 for larger buffers it just a waste of address space. Drivers which has
91 relatively small addressing window (like 64Mib) might run out of
92 virtual space with just a few allocations.
94 With this parameter you can specify the maximum PAGE_SIZE order for
95 DMA IOMMU buffers. Larger buffers will be aligned only to this
96 specified order. The order is expressed as a power of two multiplied
104 config MIGHT_HAVE_PCI
107 config SYS_SUPPORTS_APM_EMULATION
115 select GENERIC_ALLOCATOR
126 The Extended Industry Standard Architecture (EISA) bus was
127 developed as an open alternative to the IBM MicroChannel bus.
129 The EISA bus provided some of the features of the IBM MicroChannel
130 bus while maintaining backward compatibility with cards made for
131 the older ISA bus. The EISA bus saw limited use between 1988 and
132 1995 when it was made obsolete by the PCI bus.
134 Say Y here if you are building a kernel for an EISA-based machine.
141 config STACKTRACE_SUPPORT
145 config HAVE_LATENCYTOP_SUPPORT
150 config LOCKDEP_SUPPORT
154 config TRACE_IRQFLAGS_SUPPORT
158 config RWSEM_GENERIC_SPINLOCK
162 config RWSEM_XCHGADD_ALGORITHM
165 config ARCH_HAS_ILOG2_U32
168 config ARCH_HAS_ILOG2_U64
171 config ARCH_HAS_CPUFREQ
174 Internal node to signify that the ARCH has CPUFREQ support
175 and that the relevant menu configurations are displayed for
178 config GENERIC_HWEIGHT
182 config GENERIC_CALIBRATE_DELAY
186 config ARCH_MAY_HAVE_PC_FDC
192 config NEED_DMA_MAP_STATE
195 config ARCH_HAS_DMA_SET_COHERENT_MASK
198 config GENERIC_ISA_DMA
204 config NEED_RET_TO_USER
212 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
213 default DRAM_BASE if REMAP_VECTORS_TO_RAM
216 The base address of exception vectors.
218 config ARM_PATCH_PHYS_VIRT
219 bool "Patch physical to virtual translations at runtime" if EMBEDDED
221 depends on !XIP_KERNEL && MMU
222 depends on !ARCH_REALVIEW || !SPARSEMEM
224 Patch phys-to-virt and virt-to-phys translation functions at
225 boot and module load time according to the position of the
226 kernel in system memory.
228 This can only be used with non-XIP MMU kernels where the base
229 of physical memory is at a 16MB boundary.
231 Only disable this option if you know that you do not require
232 this feature (eg, building a kernel for a single machine) and
233 you need to shrink the kernel to the minimal size.
235 config NEED_MACH_GPIO_H
238 Select this when mach/gpio.h is required to provide special
239 definitions for this platform. The need for mach/gpio.h should
240 be avoided when possible.
242 config NEED_MACH_IO_H
245 Select this when mach/io.h is required to provide special
246 definitions for this platform. The need for mach/io.h should
247 be avoided when possible.
249 config NEED_MACH_MEMORY_H
252 Select this when mach/memory.h is required to provide special
253 definitions for this platform. The need for mach/memory.h should
254 be avoided when possible.
257 hex "Physical address of main memory" if MMU
258 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
259 default DRAM_BASE if !MMU
261 Please provide the physical address corresponding to the
262 location of main memory in your system.
268 source "init/Kconfig"
270 source "kernel/Kconfig.freezer"
275 bool "MMU-based Paged Memory Management Support"
278 Select if you want MMU-based virtualised addressing space
279 support by paged memory management. If unsure, say 'Y'.
282 # The "ARM system type" choice list is ordered alphabetically by option
283 # text. Please add new entries in the option alphabetic order.
286 prompt "ARM system type"
287 default ARCH_VERSATILE if !MMU
288 default ARCH_MULTIPLATFORM if MMU
290 config ARCH_MULTIPLATFORM
291 bool "Allow multiple platforms to be selected"
293 select ARM_PATCH_PHYS_VIRT
296 select MULTI_IRQ_HANDLER
300 config ARCH_INTEGRATOR
301 bool "ARM Ltd. Integrator family"
302 select ARCH_HAS_CPUFREQ
305 select COMMON_CLK_VERSATILE
306 select GENERIC_CLOCKEVENTS
309 select MULTI_IRQ_HANDLER
310 select NEED_MACH_MEMORY_H
311 select PLAT_VERSATILE
313 select VERSATILE_FPGA_IRQ
315 Support for ARM's Integrator platform.
318 bool "ARM Ltd. RealView family"
319 select ARCH_WANT_OPTIONAL_GPIOLIB
321 select ARM_TIMER_SP804
323 select COMMON_CLK_VERSATILE
324 select GENERIC_CLOCKEVENTS
325 select GPIO_PL061 if GPIOLIB
327 select NEED_MACH_MEMORY_H
328 select PLAT_VERSATILE
329 select PLAT_VERSATILE_CLCD
331 This enables support for ARM Ltd RealView boards.
333 config ARCH_VERSATILE
334 bool "ARM Ltd. Versatile family"
335 select ARCH_WANT_OPTIONAL_GPIOLIB
337 select ARM_TIMER_SP804
340 select GENERIC_CLOCKEVENTS
341 select HAVE_MACH_CLKDEV
343 select PLAT_VERSATILE
344 select PLAT_VERSATILE_CLCD
345 select PLAT_VERSATILE_CLOCK
346 select VERSATILE_FPGA_IRQ
348 This enables support for ARM Ltd Versatile board.
352 select ARCH_REQUIRE_GPIOLIB
356 select NEED_MACH_GPIO_H
357 select NEED_MACH_IO_H if PCCARD
359 select PINCTRL_AT91 if USE_OF
361 This enables support for systems based on Atmel
362 AT91RM9200 and AT91SAM9* processors.
365 bool "Broadcom BCM2835 family"
366 select ARCH_REQUIRE_GPIOLIB
368 select ARM_ERRATA_411920
369 select ARM_TIMER_SP804
374 select GENERIC_CLOCKEVENTS
375 select MULTI_IRQ_HANDLER
377 select PINCTRL_BCM2835
381 This enables support for the Broadcom BCM2835 SoC. This SoC is
382 use in the Raspberry Pi, and Roku 2 devices.
385 bool "Cavium Networks CNS3XXX family"
388 select GENERIC_CLOCKEVENTS
389 select MIGHT_HAVE_CACHE_L2X0
390 select MIGHT_HAVE_PCI
391 select PCI_DOMAINS if PCI
393 Support for Cavium Networks CNS3XXX platform.
396 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
397 select ARCH_REQUIRE_GPIOLIB
402 select GENERIC_CLOCKEVENTS
403 select MULTI_IRQ_HANDLER
404 select NEED_MACH_MEMORY_H
407 Support for Cirrus Logic 711x/721x/731x based boards.
410 bool "Cortina Systems Gemini"
411 select ARCH_REQUIRE_GPIOLIB
412 select ARCH_USES_GETTIMEOFFSET
413 select NEED_MACH_GPIO_H
416 Support for the Cortina Systems Gemini family SoCs
420 select ARCH_REQUIRE_GPIOLIB
423 select GENERIC_CLOCKEVENTS
424 select GENERIC_IRQ_CHIP
425 select MIGHT_HAVE_CACHE_L2X0
431 Support for CSR SiRFprimaII/Marco/Polo platforms
435 select ARCH_USES_GETTIMEOFFSET
438 select NEED_MACH_IO_H
439 select NEED_MACH_MEMORY_H
442 This is an evaluation board for the StrongARM processor available
443 from Digital. It has limited hardware on-board, including an
444 Ethernet interface, two PCMCIA sockets, two serial ports and a
449 select ARCH_HAS_HOLES_MEMORYMODEL
450 select ARCH_REQUIRE_GPIOLIB
451 select ARCH_USES_GETTIMEOFFSET
456 select NEED_MACH_MEMORY_H
458 This enables support for the Cirrus EP93xx series of CPUs.
460 config ARCH_FOOTBRIDGE
464 select GENERIC_CLOCKEVENTS
466 select NEED_MACH_IO_H if !MMU
467 select NEED_MACH_MEMORY_H
469 Support for systems based on the DC21285 companion chip
470 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
473 bool "Freescale MXS-based"
474 select ARCH_REQUIRE_GPIOLIB
479 select GENERIC_CLOCKEVENTS
480 select HAVE_CLK_PREPARE
481 select MULTI_IRQ_HANDLER
487 Support for Freescale MXS-based family of processors
490 bool "Hilscher NetX based"
494 select GENERIC_CLOCKEVENTS
496 This enables support for systems based on the Hilscher NetX Soc
501 select ARCH_SUPPORTS_MSI
503 select NEED_MACH_MEMORY_H
504 select NEED_RET_TO_USER
509 Support for Intel's IOP13XX (XScale) family of processors.
514 select ARCH_REQUIRE_GPIOLIB
516 select NEED_MACH_GPIO_H
517 select NEED_RET_TO_USER
521 Support for Intel's 80219 and IOP32X (XScale) family of
527 select ARCH_REQUIRE_GPIOLIB
529 select NEED_MACH_GPIO_H
530 select NEED_RET_TO_USER
534 Support for Intel's IOP33X (XScale) family of processors.
539 select ARCH_HAS_DMA_SET_COHERENT_MASK
540 select ARCH_REQUIRE_GPIOLIB
543 select DMABOUNCE if PCI
544 select GENERIC_CLOCKEVENTS
545 select MIGHT_HAVE_PCI
546 select NEED_MACH_IO_H
548 Support for Intel's IXP4XX (XScale) family of processors.
552 select ARCH_REQUIRE_GPIOLIB
554 select GENERIC_CLOCKEVENTS
555 select MIGHT_HAVE_PCI
558 select PLAT_ORION_LEGACY
559 select USB_ARCH_HAS_EHCI
561 Support for the Marvell Dove SoC 88AP510
564 bool "Marvell Kirkwood"
565 select ARCH_REQUIRE_GPIOLIB
567 select GENERIC_CLOCKEVENTS
571 select PINCTRL_KIRKWOOD
572 select PLAT_ORION_LEGACY
574 Support for the following Marvell Kirkwood series SoCs:
575 88F6180, 88F6192 and 88F6281.
578 bool "Marvell MV78xx0"
579 select ARCH_REQUIRE_GPIOLIB
581 select GENERIC_CLOCKEVENTS
583 select PLAT_ORION_LEGACY
585 Support for the following Marvell MV78xx0 series SoCs:
591 select ARCH_REQUIRE_GPIOLIB
593 select GENERIC_CLOCKEVENTS
595 select PLAT_ORION_LEGACY
597 Support for the following Marvell Orion 5x series SoCs:
598 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
599 Orion-2 (5281), Orion-1-90 (6183).
602 bool "Marvell PXA168/910/MMP2"
604 select ARCH_REQUIRE_GPIOLIB
606 select GENERIC_ALLOCATOR
607 select GENERIC_CLOCKEVENTS
610 select NEED_MACH_GPIO_H
615 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
618 bool "Micrel/Kendin KS8695"
619 select ARCH_REQUIRE_GPIOLIB
622 select GENERIC_CLOCKEVENTS
623 select NEED_MACH_MEMORY_H
625 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
626 System-on-Chip devices.
629 bool "Nuvoton W90X900 CPU"
630 select ARCH_REQUIRE_GPIOLIB
634 select GENERIC_CLOCKEVENTS
636 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
637 At present, the w90x900 has been renamed nuc900, regarding
638 the ARM series product line, you can login the following
639 link address to know more.
641 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
642 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
646 select ARCH_REQUIRE_GPIOLIB
651 select GENERIC_CLOCKEVENTS
654 select USB_ARCH_HAS_OHCI
657 Support for the NXP LPC32XX family of processors
661 select ARCH_HAS_CPUFREQ
662 select ARCH_REQUIRE_GPIOLIB
667 select GENERIC_CLOCKEVENTS
670 select MIGHT_HAVE_CACHE_L2X0
674 This enables support for NVIDIA Tegra based systems (Tegra APX,
675 Tegra 6xx and Tegra 2 series).
678 bool "PXA2xx/PXA3xx-based"
680 select ARCH_HAS_CPUFREQ
682 select ARCH_REQUIRE_GPIOLIB
683 select ARM_CPU_SUSPEND if PM
687 select GENERIC_CLOCKEVENTS
690 select MULTI_IRQ_HANDLER
691 select NEED_MACH_GPIO_H
695 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
699 select ARCH_REQUIRE_GPIOLIB
701 select GENERIC_CLOCKEVENTS
704 Support for Qualcomm MSM/QSD based systems. This runs on the
705 apps processor of the MSM/QSD and depends on a shared memory
706 interface to the modem processor which runs the baseband
707 stack and controls some vital subsystems
708 (clock and power control, etc).
711 bool "Renesas SH-Mobile / R-Mobile"
713 select GENERIC_CLOCKEVENTS
715 select HAVE_MACH_CLKDEV
717 select MIGHT_HAVE_CACHE_L2X0
718 select MULTI_IRQ_HANDLER
719 select NEED_MACH_MEMORY_H
722 select PM_GENERIC_DOMAINS if PM
725 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
730 select ARCH_MAY_HAVE_PC_FDC
731 select ARCH_SPARSEMEM_ENABLE
732 select ARCH_USES_GETTIMEOFFSET
735 select HAVE_PATA_PLATFORM
737 select NEED_MACH_IO_H
738 select NEED_MACH_MEMORY_H
742 On the Acorn Risc-PC, Linux can support the internal IDE disk and
743 CD-ROM interface, serial and parallel port, and the floppy drive.
747 select ARCH_HAS_CPUFREQ
749 select ARCH_REQUIRE_GPIOLIB
750 select ARCH_SPARSEMEM_ENABLE
755 select GENERIC_CLOCKEVENTS
758 select NEED_MACH_GPIO_H
759 select NEED_MACH_MEMORY_H
762 Support for StrongARM 11x0 based boards.
765 bool "Samsung S3C24XX SoCs"
766 select ARCH_HAS_CPUFREQ
767 select ARCH_USES_GETTIMEOFFSET
770 select HAVE_S3C2410_I2C if I2C
771 select HAVE_S3C2410_WATCHDOG if WATCHDOG
772 select HAVE_S3C_RTC if RTC_CLASS
773 select NEED_MACH_GPIO_H
774 select NEED_MACH_IO_H
776 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
777 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
778 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
779 Samsung SMDK2410 development board (and derivatives).
782 bool "Samsung S3C64XX"
783 select ARCH_HAS_CPUFREQ
784 select ARCH_REQUIRE_GPIOLIB
785 select ARCH_USES_GETTIMEOFFSET
790 select HAVE_S3C2410_I2C if I2C
791 select HAVE_S3C2410_WATCHDOG if WATCHDOG
793 select NEED_MACH_GPIO_H
797 select S3C_GPIO_TRACK
798 select SAMSUNG_CLKSRC
799 select SAMSUNG_GPIOLIB_4BIT
800 select SAMSUNG_IRQ_VIC_TIMER
801 select USB_ARCH_HAS_OHCI
803 Samsung S3C64XX series based systems
806 bool "Samsung S5P6440 S5P6450"
810 select GENERIC_CLOCKEVENTS
812 select HAVE_S3C2410_I2C if I2C
813 select HAVE_S3C2410_WATCHDOG if WATCHDOG
814 select HAVE_S3C_RTC if RTC_CLASS
815 select NEED_MACH_GPIO_H
817 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
821 bool "Samsung S5PC100"
822 select ARCH_USES_GETTIMEOFFSET
826 select HAVE_S3C2410_I2C if I2C
827 select HAVE_S3C2410_WATCHDOG if WATCHDOG
828 select HAVE_S3C_RTC if RTC_CLASS
829 select NEED_MACH_GPIO_H
831 Samsung S5PC100 series based systems
834 bool "Samsung S5PV210/S5PC110"
835 select ARCH_HAS_CPUFREQ
836 select ARCH_HAS_HOLES_MEMORYMODEL
837 select ARCH_SPARSEMEM_ENABLE
841 select GENERIC_CLOCKEVENTS
843 select HAVE_S3C2410_I2C if I2C
844 select HAVE_S3C2410_WATCHDOG if WATCHDOG
845 select HAVE_S3C_RTC if RTC_CLASS
846 select NEED_MACH_GPIO_H
847 select NEED_MACH_MEMORY_H
849 Samsung S5PV210/S5PC110 series based systems
852 bool "Samsung EXYNOS"
853 select ARCH_HAS_CPUFREQ
854 select ARCH_HAS_HOLES_MEMORYMODEL
855 select ARCH_SPARSEMEM_ENABLE
858 select GENERIC_CLOCKEVENTS
860 select HAVE_S3C2410_I2C if I2C
861 select HAVE_S3C2410_WATCHDOG if WATCHDOG
862 select HAVE_S3C_RTC if RTC_CLASS
863 select NEED_MACH_GPIO_H
864 select NEED_MACH_MEMORY_H
866 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
870 select ARCH_USES_GETTIMEOFFSET
874 select NEED_MACH_MEMORY_H
879 Support for the StrongARM based Digital DNARD machine, also known
880 as "Shark" (<http://www.shark-linux.de/shark.html>).
883 bool "ST-Ericsson U300 Series"
885 select ARCH_REQUIRE_GPIOLIB
887 select ARM_PATCH_PHYS_VIRT
893 select GENERIC_CLOCKEVENTS
897 Support for ST-Ericsson U300 series mobile platforms.
900 bool "ST-Ericsson U8500 Series"
902 select ARCH_HAS_CPUFREQ
903 select ARCH_REQUIRE_GPIOLIB
907 select GENERIC_CLOCKEVENTS
909 select MIGHT_HAVE_CACHE_L2X0
912 Support for ST-Ericsson's Ux500 architecture
915 bool "STMicroelectronics Nomadik"
916 select ARCH_REQUIRE_GPIOLIB
919 select CLKSRC_NOMADIK_MTU
922 select GENERIC_CLOCKEVENTS
923 select MIGHT_HAVE_CACHE_L2X0
926 select PINCTRL_STN8815
929 Support for the Nomadik platform by ST-Ericsson
933 select ARCH_HAS_CPUFREQ
934 select ARCH_REQUIRE_GPIOLIB
939 select GENERIC_CLOCKEVENTS
942 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
946 select ARCH_HAS_HOLES_MEMORYMODEL
947 select ARCH_REQUIRE_GPIOLIB
949 select GENERIC_ALLOCATOR
950 select GENERIC_CLOCKEVENTS
951 select GENERIC_IRQ_CHIP
953 select NEED_MACH_GPIO_H
957 Support for TI's DaVinci platform.
962 select ARCH_HAS_CPUFREQ
963 select ARCH_HAS_HOLES_MEMORYMODEL
965 select ARCH_REQUIRE_GPIOLIB
968 select GENERIC_CLOCKEVENTS
969 select GENERIC_IRQ_CHIP
973 select NEED_MACH_IO_H if PCCARD
974 select NEED_MACH_MEMORY_H
976 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
980 menu "Multiple platform selection"
981 depends on ARCH_MULTIPLATFORM
983 comment "CPU Core family selection"
986 bool "ARMv4 based platforms (FA526, StrongARM)"
987 depends on !ARCH_MULTI_V6_V7
988 select ARCH_MULTI_V4_V5
990 config ARCH_MULTI_V4T
991 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
992 depends on !ARCH_MULTI_V6_V7
993 select ARCH_MULTI_V4_V5
996 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
997 depends on !ARCH_MULTI_V6_V7
998 select ARCH_MULTI_V4_V5
1000 config ARCH_MULTI_V4_V5
1003 config ARCH_MULTI_V6
1004 bool "ARMv6 based platforms (ARM11)"
1005 select ARCH_MULTI_V6_V7
1008 config ARCH_MULTI_V7
1009 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
1011 select ARCH_MULTI_V6_V7
1012 select ARCH_VEXPRESS
1015 config ARCH_MULTI_V6_V7
1018 config ARCH_MULTI_CPU_AUTO
1019 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
1020 select ARCH_MULTI_V5
1025 # This is sorted alphabetically by mach-* pathname. However, plat-*
1026 # Kconfigs may be included either alphabetically (according to the
1027 # plat- suffix) or along side the corresponding mach-* source.
1029 source "arch/arm/mach-mvebu/Kconfig"
1031 source "arch/arm/mach-at91/Kconfig"
1033 source "arch/arm/mach-bcm/Kconfig"
1035 source "arch/arm/mach-clps711x/Kconfig"
1037 source "arch/arm/mach-cns3xxx/Kconfig"
1039 source "arch/arm/mach-davinci/Kconfig"
1041 source "arch/arm/mach-dove/Kconfig"
1043 source "arch/arm/mach-ep93xx/Kconfig"
1045 source "arch/arm/mach-footbridge/Kconfig"
1047 source "arch/arm/mach-gemini/Kconfig"
1049 source "arch/arm/mach-highbank/Kconfig"
1051 source "arch/arm/mach-integrator/Kconfig"
1053 source "arch/arm/mach-iop32x/Kconfig"
1055 source "arch/arm/mach-iop33x/Kconfig"
1057 source "arch/arm/mach-iop13xx/Kconfig"
1059 source "arch/arm/mach-ixp4xx/Kconfig"
1061 source "arch/arm/mach-kirkwood/Kconfig"
1063 source "arch/arm/mach-ks8695/Kconfig"
1065 source "arch/arm/mach-msm/Kconfig"
1067 source "arch/arm/mach-mv78xx0/Kconfig"
1069 source "arch/arm/mach-imx/Kconfig"
1071 source "arch/arm/mach-mxs/Kconfig"
1073 source "arch/arm/mach-netx/Kconfig"
1075 source "arch/arm/mach-nomadik/Kconfig"
1077 source "arch/arm/plat-omap/Kconfig"
1079 source "arch/arm/mach-omap1/Kconfig"
1081 source "arch/arm/mach-omap2/Kconfig"
1083 source "arch/arm/mach-orion5x/Kconfig"
1085 source "arch/arm/mach-picoxcell/Kconfig"
1087 source "arch/arm/mach-pxa/Kconfig"
1088 source "arch/arm/plat-pxa/Kconfig"
1090 source "arch/arm/mach-mmp/Kconfig"
1092 source "arch/arm/mach-realview/Kconfig"
1094 source "arch/arm/mach-sa1100/Kconfig"
1096 source "arch/arm/plat-samsung/Kconfig"
1098 source "arch/arm/mach-socfpga/Kconfig"
1100 source "arch/arm/plat-spear/Kconfig"
1102 source "arch/arm/mach-s3c24xx/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-sunxi/Kconfig"
1120 source "arch/arm/mach-prima2/Kconfig"
1122 source "arch/arm/mach-tegra/Kconfig"
1124 source "arch/arm/mach-u300/Kconfig"
1126 source "arch/arm/mach-ux500/Kconfig"
1128 source "arch/arm/mach-versatile/Kconfig"
1130 source "arch/arm/mach-vexpress/Kconfig"
1131 source "arch/arm/plat-versatile/Kconfig"
1133 source "arch/arm/mach-virt/Kconfig"
1135 source "arch/arm/mach-vt8500/Kconfig"
1137 source "arch/arm/mach-w90x900/Kconfig"
1139 source "arch/arm/mach-zynq/Kconfig"
1141 # Definitions to make life easier
1147 select GENERIC_CLOCKEVENTS
1153 select GENERIC_IRQ_CHIP
1156 config PLAT_ORION_LEGACY
1163 config PLAT_VERSATILE
1166 config ARM_TIMER_SP804
1170 source arch/arm/mm/Kconfig
1174 default 16 if ARCH_EP93XX
1178 bool "Enable iWMMXt support"
1179 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1180 default y if PXA27x || PXA3xx || ARCH_MMP
1182 Enable support for iWMMXt context switching at run time if
1183 running on a CPU that supports it.
1187 depends on CPU_XSCALE
1190 config MULTI_IRQ_HANDLER
1193 Allow each machine to specify it's own IRQ handler at run time.
1196 source "arch/arm/Kconfig-nommu"
1199 config ARM_ERRATA_326103
1200 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1203 Executing a SWP instruction to read-only memory does not set bit 11
1204 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1205 treat the access as a read, preventing a COW from occurring and
1206 causing the faulting task to livelock.
1208 config ARM_ERRATA_411920
1209 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1210 depends on CPU_V6 || CPU_V6K
1212 Invalidation of the Instruction Cache operation can
1213 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1214 It does not affect the MPCore. This option enables the ARM Ltd.
1215 recommended workaround.
1217 config ARM_ERRATA_430973
1218 bool "ARM errata: Stale prediction on replaced interworking branch"
1221 This option enables the workaround for the 430973 Cortex-A8
1222 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1223 interworking branch is replaced with another code sequence at the
1224 same virtual address, whether due to self-modifying code or virtual
1225 to physical address re-mapping, Cortex-A8 does not recover from the
1226 stale interworking branch prediction. This results in Cortex-A8
1227 executing the new code sequence in the incorrect ARM or Thumb state.
1228 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1229 and also flushes the branch target cache at every context switch.
1230 Note that setting specific bits in the ACTLR register may not be
1231 available in non-secure mode.
1233 config ARM_ERRATA_458693
1234 bool "ARM errata: Processor deadlock when a false hazard is created"
1236 depends on !ARCH_MULTIPLATFORM
1238 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1239 erratum. For very specific sequences of memory operations, it is
1240 possible for a hazard condition intended for a cache line to instead
1241 be incorrectly associated with a different cache line. This false
1242 hazard might then cause a processor deadlock. The workaround enables
1243 the L1 caching of the NEON accesses and disables the PLD instruction
1244 in the ACTLR register. Note that setting specific bits in the ACTLR
1245 register may not be available in non-secure mode.
1247 config ARM_ERRATA_460075
1248 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1250 depends on !ARCH_MULTIPLATFORM
1252 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1253 erratum. Any asynchronous access to the L2 cache may encounter a
1254 situation in which recent store transactions to the L2 cache are lost
1255 and overwritten with stale memory contents from external memory. The
1256 workaround disables the write-allocate mode for the L2 cache via the
1257 ACTLR register. Note that setting specific bits in the ACTLR register
1258 may not be available in non-secure mode.
1260 config ARM_ERRATA_742230
1261 bool "ARM errata: DMB operation may be faulty"
1262 depends on CPU_V7 && SMP
1263 depends on !ARCH_MULTIPLATFORM
1265 This option enables the workaround for the 742230 Cortex-A9
1266 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1267 between two write operations may not ensure the correct visibility
1268 ordering of the two writes. This workaround sets a specific bit in
1269 the diagnostic register of the Cortex-A9 which causes the DMB
1270 instruction to behave as a DSB, ensuring the correct behaviour of
1273 config ARM_ERRATA_742231
1274 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1275 depends on CPU_V7 && SMP
1276 depends on !ARCH_MULTIPLATFORM
1278 This option enables the workaround for the 742231 Cortex-A9
1279 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1280 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1281 accessing some data located in the same cache line, may get corrupted
1282 data due to bad handling of the address hazard when the line gets
1283 replaced from one of the CPUs at the same time as another CPU is
1284 accessing it. This workaround sets specific bits in the diagnostic
1285 register of the Cortex-A9 which reduces the linefill issuing
1286 capabilities of the processor.
1288 config PL310_ERRATA_588369
1289 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1290 depends on CACHE_L2X0
1292 The PL310 L2 cache controller implements three types of Clean &
1293 Invalidate maintenance operations: by Physical Address
1294 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1295 They are architecturally defined to behave as the execution of a
1296 clean operation followed immediately by an invalidate operation,
1297 both performing to the same memory location. This functionality
1298 is not correctly implemented in PL310 as clean lines are not
1299 invalidated as a result of these operations.
1301 config ARM_ERRATA_720789
1302 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1305 This option enables the workaround for the 720789 Cortex-A9 (prior to
1306 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1307 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1308 As a consequence of this erratum, some TLB entries which should be
1309 invalidated are not, resulting in an incoherency in the system page
1310 tables. The workaround changes the TLB flushing routines to invalidate
1311 entries regardless of the ASID.
1313 config PL310_ERRATA_727915
1314 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1315 depends on CACHE_L2X0
1317 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1318 operation (offset 0x7FC). This operation runs in background so that
1319 PL310 can handle normal accesses while it is in progress. Under very
1320 rare circumstances, due to this erratum, write data can be lost when
1321 PL310 treats a cacheable write transaction during a Clean &
1322 Invalidate by Way operation.
1324 config ARM_ERRATA_743622
1325 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1327 depends on !ARCH_MULTIPLATFORM
1329 This option enables the workaround for the 743622 Cortex-A9
1330 (r2p*) erratum. Under very rare conditions, a faulty
1331 optimisation in the Cortex-A9 Store Buffer may lead to data
1332 corruption. This workaround sets a specific bit in the diagnostic
1333 register of the Cortex-A9 which disables the Store Buffer
1334 optimisation, preventing the defect from occurring. This has no
1335 visible impact on the overall performance or power consumption of the
1338 config ARM_ERRATA_751472
1339 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1341 depends on !ARCH_MULTIPLATFORM
1343 This option enables the workaround for the 751472 Cortex-A9 (prior
1344 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1345 completion of a following broadcasted operation if the second
1346 operation is received by a CPU before the ICIALLUIS has completed,
1347 potentially leading to corrupted entries in the cache or TLB.
1349 config PL310_ERRATA_753970
1350 bool "PL310 errata: cache sync operation may be faulty"
1351 depends on CACHE_PL310
1353 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1355 Under some condition the effect of cache sync operation on
1356 the store buffer still remains when the operation completes.
1357 This means that the store buffer is always asked to drain and
1358 this prevents it from merging any further writes. The workaround
1359 is to replace the normal offset of cache sync operation (0x730)
1360 by another offset targeting an unmapped PL310 register 0x740.
1361 This has the same effect as the cache sync operation: store buffer
1362 drain and waiting for all buffers empty.
1364 config ARM_ERRATA_754322
1365 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1368 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1369 r3p*) erratum. A speculative memory access may cause a page table walk
1370 which starts prior to an ASID switch but completes afterwards. This
1371 can populate the micro-TLB with a stale entry which may be hit with
1372 the new ASID. This workaround places two dsb instructions in the mm
1373 switching code so that no page table walks can cross the ASID switch.
1375 config ARM_ERRATA_754327
1376 bool "ARM errata: no automatic Store Buffer drain"
1377 depends on CPU_V7 && SMP
1379 This option enables the workaround for the 754327 Cortex-A9 (prior to
1380 r2p0) erratum. The Store Buffer does not have any automatic draining
1381 mechanism and therefore a livelock may occur if an external agent
1382 continuously polls a memory location waiting to observe an update.
1383 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1384 written polling loops from denying visibility of updates to memory.
1386 config ARM_ERRATA_364296
1387 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1388 depends on CPU_V6 && !SMP
1390 This options enables the workaround for the 364296 ARM1136
1391 r0p2 erratum (possible cache data corruption with
1392 hit-under-miss enabled). It sets the undocumented bit 31 in
1393 the auxiliary control register and the FI bit in the control
1394 register, thus disabling hit-under-miss without putting the
1395 processor into full low interrupt latency mode. ARM11MPCore
1398 config ARM_ERRATA_764369
1399 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1400 depends on CPU_V7 && SMP
1402 This option enables the workaround for erratum 764369
1403 affecting Cortex-A9 MPCore with two or more processors (all
1404 current revisions). Under certain timing circumstances, a data
1405 cache line maintenance operation by MVA targeting an Inner
1406 Shareable memory region may fail to proceed up to either the
1407 Point of Coherency or to the Point of Unification of the
1408 system. This workaround adds a DSB instruction before the
1409 relevant cache maintenance functions and sets a specific bit
1410 in the diagnostic control register of the SCU.
1412 config PL310_ERRATA_769419
1413 bool "PL310 errata: no automatic Store Buffer drain"
1414 depends on CACHE_L2X0
1416 On revisions of the PL310 prior to r3p2, the Store Buffer does
1417 not automatically drain. This can cause normal, non-cacheable
1418 writes to be retained when the memory system is idle, leading
1419 to suboptimal I/O performance for drivers using coherent DMA.
1420 This option adds a write barrier to the cpu_idle loop so that,
1421 on systems with an outer cache, the store buffer is drained
1424 config ARM_ERRATA_775420
1425 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1428 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1429 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1430 operation aborts with MMU exception, it might cause the processor
1431 to deadlock. This workaround puts DSB before executing ISB if
1432 an abort may occur on cache maintenance.
1436 source "arch/arm/common/Kconfig"
1446 Find out whether you have ISA slots on your motherboard. ISA is the
1447 name of a bus system, i.e. the way the CPU talks to the other stuff
1448 inside your box. Other bus systems are PCI, EISA, MicroChannel
1449 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1450 newer boards don't support it. If you have ISA, say Y, otherwise N.
1452 # Select ISA DMA controller support
1457 # Select ISA DMA interface
1462 bool "PCI support" if MIGHT_HAVE_PCI
1464 Find out whether you have a PCI motherboard. PCI is the name of a
1465 bus system, i.e. the way the CPU talks to the other stuff inside
1466 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1467 VESA. If you have PCI, say Y, otherwise N.
1473 config PCI_NANOENGINE
1474 bool "BSE nanoEngine PCI support"
1475 depends on SA1100_NANOENGINE
1477 Enable PCI on the BSE nanoEngine board.
1482 # Select the host bridge type
1483 config PCI_HOST_VIA82C505
1485 depends on PCI && ARCH_SHARK
1488 config PCI_HOST_ITE8152
1490 depends on PCI && MACH_ARMCORE
1494 source "drivers/pci/Kconfig"
1496 source "drivers/pcmcia/Kconfig"
1500 menu "Kernel Features"
1505 This option should be selected by machines which have an SMP-
1508 The only effect of this option is to make the SMP-related
1509 options available to the user for configuration.
1512 bool "Symmetric Multi-Processing"
1513 depends on CPU_V6K || CPU_V7
1514 depends on GENERIC_CLOCKEVENTS
1517 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1518 select USE_GENERIC_SMP_HELPERS
1520 This enables support for systems with more than one CPU. If you have
1521 a system with only one CPU, like most personal computers, say N. If
1522 you have a system with more than one CPU, say Y.
1524 If you say N here, the kernel will run on single and multiprocessor
1525 machines, but will use only one CPU of a multiprocessor machine. If
1526 you say Y here, the kernel will run on many, but not all, single
1527 processor machines. On a single processor machine, the kernel will
1528 run faster if you say N here.
1530 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1531 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1532 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1534 If you don't know what to do here, say N.
1537 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1538 depends on SMP && !XIP_KERNEL
1541 SMP kernels contain instructions which fail on non-SMP processors.
1542 Enabling this option allows the kernel to modify itself to make
1543 these instructions safe. Disabling it allows about 1K of space
1546 If you don't know what to do here, say Y.
1548 config ARM_CPU_TOPOLOGY
1549 bool "Support cpu topology definition"
1550 depends on SMP && CPU_V7
1553 Support ARM cpu topology definition. The MPIDR register defines
1554 affinity between processors which is then used to describe the cpu
1555 topology of an ARM System.
1558 bool "Multi-core scheduler support"
1559 depends on ARM_CPU_TOPOLOGY
1561 Multi-core scheduler support improves the CPU scheduler's decision
1562 making when dealing with multi-core CPU chips at a cost of slightly
1563 increased overhead in some places. If unsure say N here.
1566 bool "SMT scheduler support"
1567 depends on ARM_CPU_TOPOLOGY
1569 Improves the CPU scheduler's decision making when dealing with
1570 MultiThreading at a cost of slightly increased overhead in some
1571 places. If unsure say N here.
1576 This option enables support for the ARM system coherency unit
1578 config HAVE_ARM_ARCH_TIMER
1579 bool "Architected timer support"
1581 select ARM_ARCH_TIMER
1583 This option enables support for the ARM architected timer
1588 select CLKSRC_OF if OF
1590 This options enables support for the ARM timer and watchdog unit
1593 prompt "Memory split"
1596 Select the desired split between kernel and user memory.
1598 If you are not absolutely sure what you are doing, leave this
1602 bool "3G/1G user/kernel split"
1604 bool "2G/2G user/kernel split"
1606 bool "1G/3G user/kernel split"
1611 default 0x40000000 if VMSPLIT_1G
1612 default 0x80000000 if VMSPLIT_2G
1616 int "Maximum number of CPUs (2-32)"
1622 bool "Support for hot-pluggable CPUs"
1623 depends on SMP && HOTPLUG
1625 Say Y here to experiment with turning CPUs off and on. CPUs
1626 can be controlled through /sys/devices/system/cpu.
1629 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1632 Say Y here if you want Linux to communicate with system firmware
1633 implementing the PSCI specification for CPU-centric power
1634 management operations described in ARM document number ARM DEN
1635 0022A ("Power State Coordination Interface System Software on
1639 bool "Use local timer interrupts"
1642 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1644 Enable support for local timers on SMP platforms, rather then the
1645 legacy IPI broadcast method. Local timers allows the system
1646 accounting to be spread across the timer interval, preventing a
1647 "thundering herd" at every timer tick.
1649 # The GPIO number here must be sorted by descending number. In case of
1650 # a multiplatform kernel, we just want the highest value required by the
1651 # selected platforms.
1654 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1655 default 512 if SOC_OMAP5
1656 default 355 if ARCH_U8500
1657 default 288 if ARCH_VT8500 || ARCH_SUNXI
1658 default 264 if MACH_H4700
1661 Maximum number of GPIOs in the system.
1663 If unsure, leave the default value.
1665 source kernel/Kconfig.preempt
1669 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1670 ARCH_S5PV210 || ARCH_EXYNOS4
1671 default AT91_TIMER_HZ if ARCH_AT91
1672 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1676 def_bool HIGH_RES_TIMERS
1678 config THUMB2_KERNEL
1679 bool "Compile the kernel in Thumb-2 mode"
1680 depends on CPU_V7 && !CPU_V6 && !CPU_V6K
1682 select ARM_ASM_UNIFIED
1685 By enabling this option, the kernel will be compiled in
1686 Thumb-2 mode. A compiler/assembler that understand the unified
1687 ARM-Thumb syntax is needed.
1691 config THUMB2_AVOID_R_ARM_THM_JUMP11
1692 bool "Work around buggy Thumb-2 short branch relocations in gas"
1693 depends on THUMB2_KERNEL && MODULES
1696 Various binutils versions can resolve Thumb-2 branches to
1697 locally-defined, preemptible global symbols as short-range "b.n"
1698 branch instructions.
1700 This is a problem, because there's no guarantee the final
1701 destination of the symbol, or any candidate locations for a
1702 trampoline, are within range of the branch. For this reason, the
1703 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1704 relocation in modules at all, and it makes little sense to add
1707 The symptom is that the kernel fails with an "unsupported
1708 relocation" error when loading some modules.
1710 Until fixed tools are available, passing
1711 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1712 code which hits this problem, at the cost of a bit of extra runtime
1713 stack usage in some cases.
1715 The problem is described in more detail at:
1716 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1718 Only Thumb-2 kernels are affected.
1720 Unless you are sure your tools don't have this problem, say Y.
1722 config ARM_ASM_UNIFIED
1726 bool "Use the ARM EABI to compile the kernel"
1728 This option allows for the kernel to be compiled using the latest
1729 ARM ABI (aka EABI). This is only useful if you are using a user
1730 space environment that is also compiled with EABI.
1732 Since there are major incompatibilities between the legacy ABI and
1733 EABI, especially with regard to structure member alignment, this
1734 option also changes the kernel syscall calling convention to
1735 disambiguate both ABIs and allow for backward compatibility support
1736 (selected with CONFIG_OABI_COMPAT).
1738 To use this you need GCC version 4.0.0 or later.
1741 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1742 depends on AEABI && !THUMB2_KERNEL
1745 This option preserves the old syscall interface along with the
1746 new (ARM EABI) one. It also provides a compatibility layer to
1747 intercept syscalls that have structure arguments which layout
1748 in memory differs between the legacy ABI and the new ARM EABI
1749 (only for non "thumb" binaries). This option adds a tiny
1750 overhead to all syscalls and produces a slightly larger kernel.
1751 If you know you'll be using only pure EABI user space then you
1752 can say N here. If this option is not selected and you attempt
1753 to execute a legacy ABI binary then the result will be
1754 UNPREDICTABLE (in fact it can be predicted that it won't work
1755 at all). If in doubt say Y.
1757 config ARCH_HAS_HOLES_MEMORYMODEL
1760 config ARCH_SPARSEMEM_ENABLE
1763 config ARCH_SPARSEMEM_DEFAULT
1764 def_bool ARCH_SPARSEMEM_ENABLE
1766 config ARCH_SELECT_MEMORY_MODEL
1767 def_bool ARCH_SPARSEMEM_ENABLE
1769 config HAVE_ARCH_PFN_VALID
1770 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1773 bool "High Memory Support"
1776 The address space of ARM processors is only 4 Gigabytes large
1777 and it has to accommodate user address space, kernel address
1778 space as well as some memory mapped IO. That means that, if you
1779 have a large amount of physical memory and/or IO, not all of the
1780 memory can be "permanently mapped" by the kernel. The physical
1781 memory that is not permanently mapped is called "high memory".
1783 Depending on the selected kernel/user memory split, minimum
1784 vmalloc space and actual amount of RAM, you may not need this
1785 option which should result in a slightly faster kernel.
1790 bool "Allocate 2nd-level pagetables from highmem"
1793 config HW_PERF_EVENTS
1794 bool "Enable hardware performance counter support for perf events"
1795 depends on PERF_EVENTS
1798 Enable hardware performance counter support for perf events. If
1799 disabled, perf events will use software events only.
1803 config FORCE_MAX_ZONEORDER
1804 int "Maximum zone order" if ARCH_SHMOBILE
1805 range 11 64 if ARCH_SHMOBILE
1806 default "12" if SOC_AM33XX
1807 default "9" if SA1111
1810 The kernel memory allocator divides physically contiguous memory
1811 blocks into "zones", where each zone is a power of two number of
1812 pages. This option selects the largest power of two that the kernel
1813 keeps in the memory allocator. If you need to allocate very large
1814 blocks of physically contiguous memory, then you may need to
1815 increase this value.
1817 This config option is actually maximum order plus one. For example,
1818 a value of 11 means that the largest free memory block is 2^10 pages.
1820 config ALIGNMENT_TRAP
1822 depends on CPU_CP15_MMU
1823 default y if !ARCH_EBSA110
1824 select HAVE_PROC_CPU if PROC_FS
1826 ARM processors cannot fetch/store information which is not
1827 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1828 address divisible by 4. On 32-bit ARM processors, these non-aligned
1829 fetch/store instructions will be emulated in software if you say
1830 here, which has a severe performance impact. This is necessary for
1831 correct operation of some network protocols. With an IP-only
1832 configuration it is safe to say N, otherwise say Y.
1834 config UACCESS_WITH_MEMCPY
1835 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1837 default y if CPU_FEROCEON
1839 Implement faster copy_to_user and clear_user methods for CPU
1840 cores where a 8-word STM instruction give significantly higher
1841 memory write throughput than a sequence of individual 32bit stores.
1843 A possible side effect is a slight increase in scheduling latency
1844 between threads sharing the same address space if they invoke
1845 such copy operations with large buffers.
1847 However, if the CPU data cache is using a write-allocate mode,
1848 this option is unlikely to provide any performance gain.
1852 prompt "Enable seccomp to safely compute untrusted bytecode"
1854 This kernel feature is useful for number crunching applications
1855 that may need to compute untrusted bytecode during their
1856 execution. By using pipes or other transports made available to
1857 the process as file descriptors supporting the read/write
1858 syscalls, it's possible to isolate those applications in
1859 their own address space using seccomp. Once seccomp is
1860 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1861 and the task is only allowed to execute a few safe syscalls
1862 defined by each seccomp mode.
1864 config CC_STACKPROTECTOR
1865 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1867 This option turns on the -fstack-protector GCC feature. This
1868 feature puts, at the beginning of functions, a canary value on
1869 the stack just before the return address, and validates
1870 the value just before actually returning. Stack based buffer
1871 overflows (that need to overwrite this return address) now also
1872 overwrite the canary, which gets detected and the attack is then
1873 neutralized via a kernel panic.
1874 This feature requires gcc version 4.2 or above.
1881 bool "Xen guest support on ARM (EXPERIMENTAL)"
1882 depends on ARM && AEABI && OF
1883 depends on CPU_V7 && !CPU_V6
1884 depends on !GENERIC_ATOMIC64
1886 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1893 bool "Flattened Device Tree support"
1896 select OF_EARLY_FLATTREE
1898 Include support for flattened device tree machine descriptions.
1901 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1904 This is the traditional way of passing data to the kernel at boot
1905 time. If you are solely relying on the flattened device tree (or
1906 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1907 to remove ATAGS support from your kernel binary. If unsure,
1910 config DEPRECATED_PARAM_STRUCT
1911 bool "Provide old way to pass kernel parameters"
1914 This was deprecated in 2001 and announced to live on for 5 years.
1915 Some old boot loaders still use this way.
1917 # Compressed boot loader in ROM. Yes, we really want to ask about
1918 # TEXT and BSS so we preserve their values in the config files.
1919 config ZBOOT_ROM_TEXT
1920 hex "Compressed ROM boot loader base address"
1923 The physical address at which the ROM-able zImage is to be
1924 placed in the target. Platforms which normally make use of
1925 ROM-able zImage formats normally set this to a suitable
1926 value in their defconfig file.
1928 If ZBOOT_ROM is not enabled, this has no effect.
1930 config ZBOOT_ROM_BSS
1931 hex "Compressed ROM boot loader BSS address"
1934 The base address of an area of read/write memory in the target
1935 for the ROM-able zImage which must be available while the
1936 decompressor is running. It must be large enough to hold the
1937 entire decompressed kernel plus an additional 128 KiB.
1938 Platforms which normally make use of ROM-able zImage formats
1939 normally set this to a suitable value in their defconfig file.
1941 If ZBOOT_ROM is not enabled, this has no effect.
1944 bool "Compressed boot loader in ROM/flash"
1945 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1947 Say Y here if you intend to execute your compressed kernel image
1948 (zImage) directly from ROM or flash. If unsure, say N.
1951 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1952 depends on ZBOOT_ROM && ARCH_SH7372
1953 default ZBOOT_ROM_NONE
1955 Include experimental SD/MMC loading code in the ROM-able zImage.
1956 With this enabled it is possible to write the ROM-able zImage
1957 kernel image to an MMC or SD card and boot the kernel straight
1958 from the reset vector. At reset the processor Mask ROM will load
1959 the first part of the ROM-able zImage which in turn loads the
1960 rest the kernel image to RAM.
1962 config ZBOOT_ROM_NONE
1963 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1965 Do not load image from SD or MMC
1967 config ZBOOT_ROM_MMCIF
1968 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1970 Load image from MMCIF hardware block.
1972 config ZBOOT_ROM_SH_MOBILE_SDHI
1973 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1975 Load image from SDHI hardware block
1979 config ARM_APPENDED_DTB
1980 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1981 depends on OF && !ZBOOT_ROM
1983 With this option, the boot code will look for a device tree binary
1984 (DTB) appended to zImage
1985 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1987 This is meant as a backward compatibility convenience for those
1988 systems with a bootloader that can't be upgraded to accommodate
1989 the documented boot protocol using a device tree.
1991 Beware that there is very little in terms of protection against
1992 this option being confused by leftover garbage in memory that might
1993 look like a DTB header after a reboot if no actual DTB is appended
1994 to zImage. Do not leave this option active in a production kernel
1995 if you don't intend to always append a DTB. Proper passing of the
1996 location into r2 of a bootloader provided DTB is always preferable
1999 config ARM_ATAG_DTB_COMPAT
2000 bool "Supplement the appended DTB with traditional ATAG information"
2001 depends on ARM_APPENDED_DTB
2003 Some old bootloaders can't be updated to a DTB capable one, yet
2004 they provide ATAGs with memory configuration, the ramdisk address,
2005 the kernel cmdline string, etc. Such information is dynamically
2006 provided by the bootloader and can't always be stored in a static
2007 DTB. To allow a device tree enabled kernel to be used with such
2008 bootloaders, this option allows zImage to extract the information
2009 from the ATAG list and store it at run time into the appended DTB.
2012 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
2013 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2015 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2016 bool "Use bootloader kernel arguments if available"
2018 Uses the command-line options passed by the boot loader instead of
2019 the device tree bootargs property. If the boot loader doesn't provide
2020 any, the device tree bootargs property will be used.
2022 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
2023 bool "Extend with bootloader kernel arguments"
2025 The command-line arguments provided by the boot loader will be
2026 appended to the the device tree bootargs property.
2031 string "Default kernel command string"
2034 On some architectures (EBSA110 and CATS), there is currently no way
2035 for the boot loader to pass arguments to the kernel. For these
2036 architectures, you should supply some command-line options at build
2037 time by entering them here. As a minimum, you should specify the
2038 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2041 prompt "Kernel command line type" if CMDLINE != ""
2042 default CMDLINE_FROM_BOOTLOADER
2045 config CMDLINE_FROM_BOOTLOADER
2046 bool "Use bootloader kernel arguments if available"
2048 Uses the command-line options passed by the boot loader. If
2049 the boot loader doesn't provide any, the default kernel command
2050 string provided in CMDLINE will be used.
2052 config CMDLINE_EXTEND
2053 bool "Extend bootloader kernel arguments"
2055 The command-line arguments provided by the boot loader will be
2056 appended to the default kernel command string.
2058 config CMDLINE_FORCE
2059 bool "Always use the default kernel command string"
2061 Always use the default kernel command string, even if the boot
2062 loader passes other arguments to the kernel.
2063 This is useful if you cannot or don't want to change the
2064 command-line options your boot loader passes to the kernel.
2068 bool "Kernel Execute-In-Place from ROM"
2069 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2071 Execute-In-Place allows the kernel to run from non-volatile storage
2072 directly addressable by the CPU, such as NOR flash. This saves RAM
2073 space since the text section of the kernel is not loaded from flash
2074 to RAM. Read-write sections, such as the data section and stack,
2075 are still copied to RAM. The XIP kernel is not compressed since
2076 it has to run directly from flash, so it will take more space to
2077 store it. The flash address used to link the kernel object files,
2078 and for storing it, is configuration dependent. Therefore, if you
2079 say Y here, you must know the proper physical address where to
2080 store the kernel image depending on your own flash memory usage.
2082 Also note that the make target becomes "make xipImage" rather than
2083 "make zImage" or "make Image". The final kernel binary to put in
2084 ROM memory will be arch/arm/boot/xipImage.
2088 config XIP_PHYS_ADDR
2089 hex "XIP Kernel Physical Location"
2090 depends on XIP_KERNEL
2091 default "0x00080000"
2093 This is the physical address in your flash memory the kernel will
2094 be linked for and stored to. This address is dependent on your
2098 bool "Kexec system call (EXPERIMENTAL)"
2099 depends on (!SMP || HOTPLUG_CPU)
2101 kexec is a system call that implements the ability to shutdown your
2102 current kernel, and to start another kernel. It is like a reboot
2103 but it is independent of the system firmware. And like a reboot
2104 you can start any kernel with it, not just Linux.
2106 It is an ongoing process to be certain the hardware in a machine
2107 is properly shutdown, so do not be surprised if this code does not
2108 initially work for you. It may help to enable device hotplugging
2112 bool "Export atags in procfs"
2113 depends on ATAGS && KEXEC
2116 Should the atags used to boot the kernel be exported in an "atags"
2117 file in procfs. Useful with kexec.
2120 bool "Build kdump crash kernel (EXPERIMENTAL)"
2122 Generate crash dump after being started by kexec. This should
2123 be normally only set in special crash dump kernels which are
2124 loaded in the main kernel with kexec-tools into a specially
2125 reserved region and then later executed after a crash by
2126 kdump/kexec. The crash dump kernel must be compiled to a
2127 memory address not used by the main kernel
2129 For more details see Documentation/kdump/kdump.txt
2131 config AUTO_ZRELADDR
2132 bool "Auto calculation of the decompressed kernel image address"
2133 depends on !ZBOOT_ROM && !ARCH_U300
2135 ZRELADDR is the physical address where the decompressed kernel
2136 image will be placed. If AUTO_ZRELADDR is selected, the address
2137 will be determined at run-time by masking the current IP with
2138 0xf8000000. This assumes the zImage being placed in the first 128MB
2139 from start of memory.
2143 menu "CPU Power Management"
2147 source "drivers/cpufreq/Kconfig"
2149 config CPU_FREQ_SA1100
2152 config CPU_FREQ_SA1110
2155 config CPU_FREQ_INTEGRATOR
2156 tristate "CPUfreq driver for ARM Integrator CPUs"
2157 depends on ARCH_INTEGRATOR && CPU_FREQ
2160 This enables the CPUfreq driver for ARM Integrator CPUs.
2162 For details, take a look at <file:Documentation/cpu-freq>.
2168 depends on CPU_FREQ && ARCH_PXA && PXA25x
2170 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2171 select CPU_FREQ_TABLE
2176 Internal configuration node for common cpufreq on Samsung SoC
2178 config CPU_FREQ_S3C24XX
2179 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2180 depends on ARCH_S3C24XX && CPU_FREQ
2183 This enables the CPUfreq driver for the Samsung S3C24XX family
2186 For details, take a look at <file:Documentation/cpu-freq>.
2190 config CPU_FREQ_S3C24XX_PLL
2191 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2192 depends on CPU_FREQ_S3C24XX
2194 Compile in support for changing the PLL frequency from the
2195 S3C24XX series CPUfreq driver. The PLL takes time to settle
2196 after a frequency change, so by default it is not enabled.
2198 This also means that the PLL tables for the selected CPU(s) will
2199 be built which may increase the size of the kernel image.
2201 config CPU_FREQ_S3C24XX_DEBUG
2202 bool "Debug CPUfreq Samsung driver core"
2203 depends on CPU_FREQ_S3C24XX
2205 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2207 config CPU_FREQ_S3C24XX_IODEBUG
2208 bool "Debug CPUfreq Samsung driver IO timing"
2209 depends on CPU_FREQ_S3C24XX
2211 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2213 config CPU_FREQ_S3C24XX_DEBUGFS
2214 bool "Export debugfs for CPUFreq"
2215 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2217 Export status information via debugfs.
2221 source "drivers/cpuidle/Kconfig"
2225 menu "Floating point emulation"
2227 comment "At least one emulation must be selected"
2230 bool "NWFPE math emulation"
2231 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2233 Say Y to include the NWFPE floating point emulator in the kernel.
2234 This is necessary to run most binaries. Linux does not currently
2235 support floating point hardware so you need to say Y here even if
2236 your machine has an FPA or floating point co-processor podule.
2238 You may say N here if you are going to load the Acorn FPEmulator
2239 early in the bootup.
2242 bool "Support extended precision"
2243 depends on FPE_NWFPE
2245 Say Y to include 80-bit support in the kernel floating-point
2246 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2247 Note that gcc does not generate 80-bit operations by default,
2248 so in most cases this option only enlarges the size of the
2249 floating point emulator without any good reason.
2251 You almost surely want to say N here.
2254 bool "FastFPE math emulation (EXPERIMENTAL)"
2255 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2257 Say Y here to include the FAST floating point emulator in the kernel.
2258 This is an experimental much faster emulator which now also has full
2259 precision for the mantissa. It does not support any exceptions.
2260 It is very simple, and approximately 3-6 times faster than NWFPE.
2262 It should be sufficient for most programs. It may be not suitable
2263 for scientific calculations, but you have to check this for yourself.
2264 If you do not feel you need a faster FP emulation you should better
2268 bool "VFP-format floating point maths"
2269 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2271 Say Y to include VFP support code in the kernel. This is needed
2272 if your hardware includes a VFP unit.
2274 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2275 release notes and additional status information.
2277 Say N if your target does not have VFP hardware.
2285 bool "Advanced SIMD (NEON) Extension support"
2286 depends on VFPv3 && CPU_V7
2288 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2293 menu "Userspace binary formats"
2295 source "fs/Kconfig.binfmt"
2298 tristate "RISC OS personality"
2301 Say Y here to include the kernel code necessary if you want to run
2302 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2303 experimental; if this sounds frightening, say N and sleep in peace.
2304 You can also say M here to compile this support as a module (which
2305 will be called arthur).
2309 menu "Power management options"
2311 source "kernel/power/Kconfig"
2313 config ARCH_SUSPEND_POSSIBLE
2314 depends on !ARCH_S5PC100
2315 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2316 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2319 config ARM_CPU_SUSPEND
2324 source "net/Kconfig"
2326 source "drivers/Kconfig"
2330 source "arch/arm/Kconfig.debug"
2332 source "security/Kconfig"
2334 source "crypto/Kconfig"
2336 source "lib/Kconfig"
2338 source "arch/arm/kvm/Kconfig"