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 This enables support for systems based on Atmel
335 AT91RM9200 and AT91SAM9* processors.
338 bool "Broadcom BCM2835 family"
339 select ARCH_WANT_OPTIONAL_GPIOLIB
341 select ARM_ERRATA_411920
342 select ARM_TIMER_SP804
346 select GENERIC_CLOCKEVENTS
347 select MULTI_IRQ_HANDLER
351 This enables support for the Broadcom BCM2835 SoC. This SoC is
352 use in the Raspberry Pi, and Roku 2 devices.
355 bool "Cavium Networks CNS3XXX family"
358 select GENERIC_CLOCKEVENTS
359 select MIGHT_HAVE_CACHE_L2X0
360 select MIGHT_HAVE_PCI
361 select PCI_DOMAINS if PCI
363 Support for Cavium Networks CNS3XXX platform.
366 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
367 select ARCH_USES_GETTIMEOFFSET
371 select NEED_MACH_MEMORY_H
373 Support for Cirrus Logic 711x/721x/731x based boards.
376 bool "Cortina Systems Gemini"
377 select ARCH_REQUIRE_GPIOLIB
378 select ARCH_USES_GETTIMEOFFSET
381 Support for the Cortina Systems Gemini family SoCs
385 select ARCH_REQUIRE_GPIOLIB
387 select GENERIC_CLOCKEVENTS
388 select GENERIC_IRQ_CHIP
389 select MIGHT_HAVE_CACHE_L2X0
395 Support for CSR SiRFprimaII/Marco/Polo platforms
399 select ARCH_USES_GETTIMEOFFSET
402 select NEED_MACH_IO_H
403 select NEED_MACH_MEMORY_H
406 This is an evaluation board for the StrongARM processor available
407 from Digital. It has limited hardware on-board, including an
408 Ethernet interface, two PCMCIA sockets, two serial ports and a
413 select ARCH_HAS_HOLES_MEMORYMODEL
414 select ARCH_REQUIRE_GPIOLIB
415 select ARCH_USES_GETTIMEOFFSET
420 select NEED_MACH_MEMORY_H
422 This enables support for the Cirrus EP93xx series of CPUs.
424 config ARCH_FOOTBRIDGE
428 select GENERIC_CLOCKEVENTS
430 select NEED_MACH_IO_H if !MMU
431 select NEED_MACH_MEMORY_H
433 Support for systems based on the DC21285 companion chip
434 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
437 bool "Freescale MXC/iMX-based"
438 select ARCH_REQUIRE_GPIOLIB
441 select GENERIC_CLOCKEVENTS
442 select GENERIC_IRQ_CHIP
443 select MULTI_IRQ_HANDLER
447 Support for Freescale MXC/iMX-based family of processors
450 bool "Freescale MXS-based"
451 select ARCH_REQUIRE_GPIOLIB
455 select GENERIC_CLOCKEVENTS
456 select HAVE_CLK_PREPARE
457 select MULTI_IRQ_HANDLER
462 Support for Freescale MXS-based family of processors
465 bool "Hilscher NetX based"
469 select GENERIC_CLOCKEVENTS
471 This enables support for systems based on the Hilscher NetX Soc
474 bool "Hynix HMS720x-based"
475 select ARCH_USES_GETTIMEOFFSET
479 This enables support for systems based on the Hynix HMS720x
484 select ARCH_SUPPORTS_MSI
486 select NEED_MACH_MEMORY_H
487 select NEED_RET_TO_USER
492 Support for Intel's IOP13XX (XScale) family of processors.
497 select ARCH_REQUIRE_GPIOLIB
499 select NEED_MACH_GPIO_H
500 select NEED_RET_TO_USER
504 Support for Intel's 80219 and IOP32X (XScale) family of
510 select ARCH_REQUIRE_GPIOLIB
512 select NEED_MACH_GPIO_H
513 select NEED_RET_TO_USER
517 Support for Intel's IOP33X (XScale) family of processors.
522 select ARCH_HAS_DMA_SET_COHERENT_MASK
523 select ARCH_REQUIRE_GPIOLIB
526 select DMABOUNCE if PCI
527 select GENERIC_CLOCKEVENTS
528 select MIGHT_HAVE_PCI
529 select NEED_MACH_IO_H
531 Support for Intel's IXP4XX (XScale) family of processors.
535 select ARCH_REQUIRE_GPIOLIB
537 select GENERIC_CLOCKEVENTS
538 select MIGHT_HAVE_PCI
539 select PLAT_ORION_LEGACY
540 select USB_ARCH_HAS_EHCI
542 Support for the Marvell Dove SoC 88AP510
545 bool "Marvell Kirkwood"
546 select ARCH_REQUIRE_GPIOLIB
548 select GENERIC_CLOCKEVENTS
551 select PLAT_ORION_LEGACY
553 Support for the following Marvell Kirkwood series SoCs:
554 88F6180, 88F6192 and 88F6281.
557 bool "Marvell MV78xx0"
558 select ARCH_REQUIRE_GPIOLIB
560 select GENERIC_CLOCKEVENTS
562 select PLAT_ORION_LEGACY
564 Support for the following Marvell MV78xx0 series SoCs:
570 select ARCH_REQUIRE_GPIOLIB
572 select GENERIC_CLOCKEVENTS
574 select PLAT_ORION_LEGACY
576 Support for the following Marvell Orion 5x series SoCs:
577 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
578 Orion-2 (5281), Orion-1-90 (6183).
581 bool "Marvell PXA168/910/MMP2"
583 select ARCH_REQUIRE_GPIOLIB
585 select GENERIC_ALLOCATOR
586 select GENERIC_CLOCKEVENTS
589 select NEED_MACH_GPIO_H
593 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
596 bool "Micrel/Kendin KS8695"
597 select ARCH_REQUIRE_GPIOLIB
600 select GENERIC_CLOCKEVENTS
601 select NEED_MACH_MEMORY_H
603 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
604 System-on-Chip devices.
607 bool "Nuvoton W90X900 CPU"
608 select ARCH_REQUIRE_GPIOLIB
612 select GENERIC_CLOCKEVENTS
614 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
615 At present, the w90x900 has been renamed nuc900, regarding
616 the ARM series product line, you can login the following
617 link address to know more.
619 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
620 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
624 select ARCH_REQUIRE_GPIOLIB
629 select GENERIC_CLOCKEVENTS
632 select USB_ARCH_HAS_OHCI
635 Support for the NXP LPC32XX family of processors
639 select ARCH_HAS_CPUFREQ
643 select GENERIC_CLOCKEVENTS
647 select MIGHT_HAVE_CACHE_L2X0
650 This enables support for NVIDIA Tegra based systems (Tegra APX,
651 Tegra 6xx and Tegra 2 series).
654 bool "PXA2xx/PXA3xx-based"
656 select ARCH_HAS_CPUFREQ
658 select ARCH_REQUIRE_GPIOLIB
659 select ARM_CPU_SUSPEND if PM
663 select GENERIC_CLOCKEVENTS
666 select MULTI_IRQ_HANDLER
667 select NEED_MACH_GPIO_H
671 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
675 select ARCH_REQUIRE_GPIOLIB
677 select GENERIC_CLOCKEVENTS
680 Support for Qualcomm MSM/QSD based systems. This runs on the
681 apps processor of the MSM/QSD and depends on a shared memory
682 interface to the modem processor which runs the baseband
683 stack and controls some vital subsystems
684 (clock and power control, etc).
687 bool "Renesas SH-Mobile / R-Mobile"
689 select GENERIC_CLOCKEVENTS
691 select HAVE_MACH_CLKDEV
693 select MIGHT_HAVE_CACHE_L2X0
694 select MULTI_IRQ_HANDLER
695 select NEED_MACH_MEMORY_H
697 select PM_GENERIC_DOMAINS if PM
700 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
705 select ARCH_MAY_HAVE_PC_FDC
706 select ARCH_SPARSEMEM_ENABLE
707 select ARCH_USES_GETTIMEOFFSET
710 select HAVE_PATA_PLATFORM
712 select NEED_MACH_IO_H
713 select NEED_MACH_MEMORY_H
716 On the Acorn Risc-PC, Linux can support the internal IDE disk and
717 CD-ROM interface, serial and parallel port, and the floppy drive.
721 select ARCH_HAS_CPUFREQ
723 select ARCH_REQUIRE_GPIOLIB
724 select ARCH_SPARSEMEM_ENABLE
729 select GENERIC_CLOCKEVENTS
732 select NEED_MACH_GPIO_H
733 select NEED_MACH_MEMORY_H
736 Support for StrongARM 11x0 based boards.
739 bool "Samsung S3C24XX SoCs"
740 select ARCH_HAS_CPUFREQ
741 select ARCH_USES_GETTIMEOFFSET
745 select HAVE_S3C2410_I2C if I2C
746 select HAVE_S3C2410_WATCHDOG if WATCHDOG
747 select HAVE_S3C_RTC if RTC_CLASS
748 select NEED_MACH_GPIO_H
749 select NEED_MACH_IO_H
751 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
752 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
753 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
754 Samsung SMDK2410 development board (and derivatives).
757 bool "Samsung S3C64XX"
758 select ARCH_HAS_CPUFREQ
759 select ARCH_REQUIRE_GPIOLIB
760 select ARCH_USES_GETTIMEOFFSET
765 select HAVE_S3C2410_I2C if I2C
766 select HAVE_S3C2410_WATCHDOG if WATCHDOG
768 select NEED_MACH_GPIO_H
772 select S3C_GPIO_TRACK
773 select SAMSUNG_CLKSRC
774 select SAMSUNG_GPIOLIB_4BIT
775 select SAMSUNG_IRQ_VIC_TIMER
776 select USB_ARCH_HAS_OHCI
778 Samsung S3C64XX series based systems
781 bool "Samsung S5P6440 S5P6450"
785 select GENERIC_CLOCKEVENTS
788 select HAVE_S3C2410_I2C if I2C
789 select HAVE_S3C2410_WATCHDOG if WATCHDOG
790 select HAVE_S3C_RTC if RTC_CLASS
791 select NEED_MACH_GPIO_H
793 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
797 bool "Samsung S5PC100"
798 select ARCH_USES_GETTIMEOFFSET
803 select HAVE_S3C2410_I2C if I2C
804 select HAVE_S3C2410_WATCHDOG if WATCHDOG
805 select HAVE_S3C_RTC if RTC_CLASS
806 select NEED_MACH_GPIO_H
808 Samsung S5PC100 series based systems
811 bool "Samsung S5PV210/S5PC110"
812 select ARCH_HAS_CPUFREQ
813 select ARCH_HAS_HOLES_MEMORYMODEL
814 select ARCH_SPARSEMEM_ENABLE
818 select GENERIC_CLOCKEVENTS
821 select HAVE_S3C2410_I2C if I2C
822 select HAVE_S3C2410_WATCHDOG if WATCHDOG
823 select HAVE_S3C_RTC if RTC_CLASS
824 select NEED_MACH_GPIO_H
825 select NEED_MACH_MEMORY_H
827 Samsung S5PV210/S5PC110 series based systems
830 bool "Samsung EXYNOS"
831 select ARCH_HAS_CPUFREQ
832 select ARCH_HAS_HOLES_MEMORYMODEL
833 select ARCH_SPARSEMEM_ENABLE
836 select GENERIC_CLOCKEVENTS
839 select HAVE_S3C2410_I2C if I2C
840 select HAVE_S3C2410_WATCHDOG if WATCHDOG
841 select HAVE_S3C_RTC if RTC_CLASS
842 select NEED_MACH_GPIO_H
843 select NEED_MACH_MEMORY_H
845 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
849 select ARCH_USES_GETTIMEOFFSET
853 select NEED_MACH_MEMORY_H
857 Support for the StrongARM based Digital DNARD machine, also known
858 as "Shark" (<http://www.shark-linux.de/shark.html>).
861 bool "ST-Ericsson U300 Series"
863 select ARCH_REQUIRE_GPIOLIB
865 select ARM_PATCH_PHYS_VIRT
871 select GENERIC_CLOCKEVENTS
876 Support for ST-Ericsson U300 series mobile platforms.
879 bool "ST-Ericsson U8500 Series"
881 select ARCH_HAS_CPUFREQ
882 select ARCH_REQUIRE_GPIOLIB
886 select GENERIC_CLOCKEVENTS
888 select MIGHT_HAVE_CACHE_L2X0
890 Support for ST-Ericsson's Ux500 architecture
893 bool "STMicroelectronics Nomadik"
894 select ARCH_REQUIRE_GPIOLIB
899 select GENERIC_CLOCKEVENTS
900 select MIGHT_HAVE_CACHE_L2X0
902 select PINCTRL_STN8815
904 Support for the Nomadik platform by ST-Ericsson
908 select ARCH_REQUIRE_GPIOLIB
913 select GENERIC_CLOCKEVENTS
916 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
920 select ARCH_HAS_HOLES_MEMORYMODEL
921 select ARCH_REQUIRE_GPIOLIB
923 select GENERIC_ALLOCATOR
924 select GENERIC_CLOCKEVENTS
925 select GENERIC_IRQ_CHIP
927 select NEED_MACH_GPIO_H
930 Support for TI's DaVinci platform.
935 select ARCH_HAS_CPUFREQ
936 select ARCH_HAS_HOLES_MEMORYMODEL
937 select ARCH_REQUIRE_GPIOLIB
939 select GENERIC_CLOCKEVENTS
941 select NEED_MACH_GPIO_H
943 Support for TI's OMAP platform (OMAP1/2/3/4).
946 bool "VIA/WonderMedia 85xx"
947 select ARCH_HAS_CPUFREQ
948 select ARCH_REQUIRE_GPIOLIB
952 select GENERIC_CLOCKEVENTS
957 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
960 bool "Xilinx Zynq ARM Cortex A9 Platform"
965 select GENERIC_CLOCKEVENTS
967 select MIGHT_HAVE_CACHE_L2X0
970 Support for Xilinx Zynq ARM Cortex A9 Platform
973 menu "Multiple platform selection"
974 depends on ARCH_MULTIPLATFORM
976 comment "CPU Core family selection"
979 bool "ARMv4 based platforms (FA526, StrongARM)"
980 depends on !ARCH_MULTI_V6_V7
981 select ARCH_MULTI_V4_V5
983 config ARCH_MULTI_V4T
984 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
985 depends on !ARCH_MULTI_V6_V7
986 select ARCH_MULTI_V4_V5
989 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
990 depends on !ARCH_MULTI_V6_V7
991 select ARCH_MULTI_V4_V5
993 config ARCH_MULTI_V4_V5
997 bool "ARMv6 based platforms (ARM11, Scorpion, ...)"
998 select ARCH_MULTI_V6_V7
1001 config ARCH_MULTI_V7
1002 bool "ARMv7 based platforms (Cortex-A, PJ4, Krait)"
1004 select ARCH_MULTI_V6_V7
1005 select ARCH_VEXPRESS
1008 config ARCH_MULTI_V6_V7
1011 config ARCH_MULTI_CPU_AUTO
1012 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
1013 select ARCH_MULTI_V5
1018 # This is sorted alphabetically by mach-* pathname. However, plat-*
1019 # Kconfigs may be included either alphabetically (according to the
1020 # plat- suffix) or along side the corresponding mach-* source.
1022 source "arch/arm/mach-mvebu/Kconfig"
1024 source "arch/arm/mach-at91/Kconfig"
1026 source "arch/arm/mach-clps711x/Kconfig"
1028 source "arch/arm/mach-cns3xxx/Kconfig"
1030 source "arch/arm/mach-davinci/Kconfig"
1032 source "arch/arm/mach-dove/Kconfig"
1034 source "arch/arm/mach-ep93xx/Kconfig"
1036 source "arch/arm/mach-footbridge/Kconfig"
1038 source "arch/arm/mach-gemini/Kconfig"
1040 source "arch/arm/mach-h720x/Kconfig"
1042 source "arch/arm/mach-highbank/Kconfig"
1044 source "arch/arm/mach-integrator/Kconfig"
1046 source "arch/arm/mach-iop32x/Kconfig"
1048 source "arch/arm/mach-iop33x/Kconfig"
1050 source "arch/arm/mach-iop13xx/Kconfig"
1052 source "arch/arm/mach-ixp4xx/Kconfig"
1054 source "arch/arm/mach-kirkwood/Kconfig"
1056 source "arch/arm/mach-ks8695/Kconfig"
1058 source "arch/arm/mach-msm/Kconfig"
1060 source "arch/arm/mach-mv78xx0/Kconfig"
1062 source "arch/arm/plat-mxc/Kconfig"
1064 source "arch/arm/mach-mxs/Kconfig"
1066 source "arch/arm/mach-netx/Kconfig"
1068 source "arch/arm/mach-nomadik/Kconfig"
1069 source "arch/arm/plat-nomadik/Kconfig"
1071 source "arch/arm/plat-omap/Kconfig"
1073 source "arch/arm/mach-omap1/Kconfig"
1075 source "arch/arm/mach-omap2/Kconfig"
1077 source "arch/arm/mach-orion5x/Kconfig"
1079 source "arch/arm/mach-picoxcell/Kconfig"
1081 source "arch/arm/mach-pxa/Kconfig"
1082 source "arch/arm/plat-pxa/Kconfig"
1084 source "arch/arm/mach-mmp/Kconfig"
1086 source "arch/arm/mach-realview/Kconfig"
1088 source "arch/arm/mach-sa1100/Kconfig"
1090 source "arch/arm/plat-samsung/Kconfig"
1091 source "arch/arm/plat-s3c24xx/Kconfig"
1093 source "arch/arm/mach-socfpga/Kconfig"
1095 source "arch/arm/plat-spear/Kconfig"
1097 source "arch/arm/mach-s3c24xx/Kconfig"
1099 source "arch/arm/mach-s3c2412/Kconfig"
1100 source "arch/arm/mach-s3c2440/Kconfig"
1104 source "arch/arm/mach-s3c64xx/Kconfig"
1107 source "arch/arm/mach-s5p64x0/Kconfig"
1109 source "arch/arm/mach-s5pc100/Kconfig"
1111 source "arch/arm/mach-s5pv210/Kconfig"
1113 source "arch/arm/mach-exynos/Kconfig"
1115 source "arch/arm/mach-shmobile/Kconfig"
1117 source "arch/arm/mach-prima2/Kconfig"
1119 source "arch/arm/mach-tegra/Kconfig"
1121 source "arch/arm/mach-u300/Kconfig"
1123 source "arch/arm/mach-ux500/Kconfig"
1125 source "arch/arm/mach-versatile/Kconfig"
1127 source "arch/arm/mach-vexpress/Kconfig"
1128 source "arch/arm/plat-versatile/Kconfig"
1130 source "arch/arm/mach-w90x900/Kconfig"
1132 # Definitions to make life easier
1138 select GENERIC_CLOCKEVENTS
1144 select GENERIC_IRQ_CHIP
1147 config PLAT_ORION_LEGACY
1154 config PLAT_VERSATILE
1157 config ARM_TIMER_SP804
1160 select HAVE_SCHED_CLOCK
1162 source arch/arm/mm/Kconfig
1166 default 16 if ARCH_EP93XX
1170 bool "Enable iWMMXt support"
1171 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1172 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1174 Enable support for iWMMXt context switching at run time if
1175 running on a CPU that supports it.
1179 depends on CPU_XSCALE
1182 config MULTI_IRQ_HANDLER
1185 Allow each machine to specify it's own IRQ handler at run time.
1188 source "arch/arm/Kconfig-nommu"
1191 config ARM_ERRATA_326103
1192 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1195 Executing a SWP instruction to read-only memory does not set bit 11
1196 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1197 treat the access as a read, preventing a COW from occurring and
1198 causing the faulting task to livelock.
1200 config ARM_ERRATA_411920
1201 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1202 depends on CPU_V6 || CPU_V6K
1204 Invalidation of the Instruction Cache operation can
1205 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1206 It does not affect the MPCore. This option enables the ARM Ltd.
1207 recommended workaround.
1209 config ARM_ERRATA_430973
1210 bool "ARM errata: Stale prediction on replaced interworking branch"
1213 This option enables the workaround for the 430973 Cortex-A8
1214 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1215 interworking branch is replaced with another code sequence at the
1216 same virtual address, whether due to self-modifying code or virtual
1217 to physical address re-mapping, Cortex-A8 does not recover from the
1218 stale interworking branch prediction. This results in Cortex-A8
1219 executing the new code sequence in the incorrect ARM or Thumb state.
1220 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1221 and also flushes the branch target cache at every context switch.
1222 Note that setting specific bits in the ACTLR register may not be
1223 available in non-secure mode.
1225 config ARM_ERRATA_458693
1226 bool "ARM errata: Processor deadlock when a false hazard is created"
1229 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1230 erratum. For very specific sequences of memory operations, it is
1231 possible for a hazard condition intended for a cache line to instead
1232 be incorrectly associated with a different cache line. This false
1233 hazard might then cause a processor deadlock. The workaround enables
1234 the L1 caching of the NEON accesses and disables the PLD instruction
1235 in the ACTLR register. Note that setting specific bits in the ACTLR
1236 register may not be available in non-secure mode.
1238 config ARM_ERRATA_460075
1239 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1242 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1243 erratum. Any asynchronous access to the L2 cache may encounter a
1244 situation in which recent store transactions to the L2 cache are lost
1245 and overwritten with stale memory contents from external memory. The
1246 workaround disables the write-allocate mode for the L2 cache via the
1247 ACTLR register. Note that setting specific bits in the ACTLR register
1248 may not be available in non-secure mode.
1250 config ARM_ERRATA_742230
1251 bool "ARM errata: DMB operation may be faulty"
1252 depends on CPU_V7 && SMP
1254 This option enables the workaround for the 742230 Cortex-A9
1255 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1256 between two write operations may not ensure the correct visibility
1257 ordering of the two writes. This workaround sets a specific bit in
1258 the diagnostic register of the Cortex-A9 which causes the DMB
1259 instruction to behave as a DSB, ensuring the correct behaviour of
1262 config ARM_ERRATA_742231
1263 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1264 depends on CPU_V7 && SMP
1266 This option enables the workaround for the 742231 Cortex-A9
1267 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1268 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1269 accessing some data located in the same cache line, may get corrupted
1270 data due to bad handling of the address hazard when the line gets
1271 replaced from one of the CPUs at the same time as another CPU is
1272 accessing it. This workaround sets specific bits in the diagnostic
1273 register of the Cortex-A9 which reduces the linefill issuing
1274 capabilities of the processor.
1276 config PL310_ERRATA_588369
1277 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1278 depends on CACHE_L2X0
1280 The PL310 L2 cache controller implements three types of Clean &
1281 Invalidate maintenance operations: by Physical Address
1282 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1283 They are architecturally defined to behave as the execution of a
1284 clean operation followed immediately by an invalidate operation,
1285 both performing to the same memory location. This functionality
1286 is not correctly implemented in PL310 as clean lines are not
1287 invalidated as a result of these operations.
1289 config ARM_ERRATA_720789
1290 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1293 This option enables the workaround for the 720789 Cortex-A9 (prior to
1294 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1295 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1296 As a consequence of this erratum, some TLB entries which should be
1297 invalidated are not, resulting in an incoherency in the system page
1298 tables. The workaround changes the TLB flushing routines to invalidate
1299 entries regardless of the ASID.
1301 config PL310_ERRATA_727915
1302 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1303 depends on CACHE_L2X0
1305 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1306 operation (offset 0x7FC). This operation runs in background so that
1307 PL310 can handle normal accesses while it is in progress. Under very
1308 rare circumstances, due to this erratum, write data can be lost when
1309 PL310 treats a cacheable write transaction during a Clean &
1310 Invalidate by Way operation.
1312 config ARM_ERRATA_743622
1313 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1316 This option enables the workaround for the 743622 Cortex-A9
1317 (r2p*) erratum. Under very rare conditions, a faulty
1318 optimisation in the Cortex-A9 Store Buffer may lead to data
1319 corruption. This workaround sets a specific bit in the diagnostic
1320 register of the Cortex-A9 which disables the Store Buffer
1321 optimisation, preventing the defect from occurring. This has no
1322 visible impact on the overall performance or power consumption of the
1325 config ARM_ERRATA_751472
1326 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1329 This option enables the workaround for the 751472 Cortex-A9 (prior
1330 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1331 completion of a following broadcasted operation if the second
1332 operation is received by a CPU before the ICIALLUIS has completed,
1333 potentially leading to corrupted entries in the cache or TLB.
1335 config PL310_ERRATA_753970
1336 bool "PL310 errata: cache sync operation may be faulty"
1337 depends on CACHE_PL310
1339 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1341 Under some condition the effect of cache sync operation on
1342 the store buffer still remains when the operation completes.
1343 This means that the store buffer is always asked to drain and
1344 this prevents it from merging any further writes. The workaround
1345 is to replace the normal offset of cache sync operation (0x730)
1346 by another offset targeting an unmapped PL310 register 0x740.
1347 This has the same effect as the cache sync operation: store buffer
1348 drain and waiting for all buffers empty.
1350 config ARM_ERRATA_754322
1351 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1354 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1355 r3p*) erratum. A speculative memory access may cause a page table walk
1356 which starts prior to an ASID switch but completes afterwards. This
1357 can populate the micro-TLB with a stale entry which may be hit with
1358 the new ASID. This workaround places two dsb instructions in the mm
1359 switching code so that no page table walks can cross the ASID switch.
1361 config ARM_ERRATA_754327
1362 bool "ARM errata: no automatic Store Buffer drain"
1363 depends on CPU_V7 && SMP
1365 This option enables the workaround for the 754327 Cortex-A9 (prior to
1366 r2p0) erratum. The Store Buffer does not have any automatic draining
1367 mechanism and therefore a livelock may occur if an external agent
1368 continuously polls a memory location waiting to observe an update.
1369 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1370 written polling loops from denying visibility of updates to memory.
1372 config ARM_ERRATA_364296
1373 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1374 depends on CPU_V6 && !SMP
1376 This options enables the workaround for the 364296 ARM1136
1377 r0p2 erratum (possible cache data corruption with
1378 hit-under-miss enabled). It sets the undocumented bit 31 in
1379 the auxiliary control register and the FI bit in the control
1380 register, thus disabling hit-under-miss without putting the
1381 processor into full low interrupt latency mode. ARM11MPCore
1384 config ARM_ERRATA_764369
1385 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1386 depends on CPU_V7 && SMP
1388 This option enables the workaround for erratum 764369
1389 affecting Cortex-A9 MPCore with two or more processors (all
1390 current revisions). Under certain timing circumstances, a data
1391 cache line maintenance operation by MVA targeting an Inner
1392 Shareable memory region may fail to proceed up to either the
1393 Point of Coherency or to the Point of Unification of the
1394 system. This workaround adds a DSB instruction before the
1395 relevant cache maintenance functions and sets a specific bit
1396 in the diagnostic control register of the SCU.
1398 config PL310_ERRATA_769419
1399 bool "PL310 errata: no automatic Store Buffer drain"
1400 depends on CACHE_L2X0
1402 On revisions of the PL310 prior to r3p2, the Store Buffer does
1403 not automatically drain. This can cause normal, non-cacheable
1404 writes to be retained when the memory system is idle, leading
1405 to suboptimal I/O performance for drivers using coherent DMA.
1406 This option adds a write barrier to the cpu_idle loop so that,
1407 on systems with an outer cache, the store buffer is drained
1410 config ARM_ERRATA_775420
1411 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1414 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1415 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1416 operation aborts with MMU exception, it might cause the processor
1417 to deadlock. This workaround puts DSB before executing ISB if
1418 an abort may occur on cache maintenance.
1422 source "arch/arm/common/Kconfig"
1432 Find out whether you have ISA slots on your motherboard. ISA is the
1433 name of a bus system, i.e. the way the CPU talks to the other stuff
1434 inside your box. Other bus systems are PCI, EISA, MicroChannel
1435 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1436 newer boards don't support it. If you have ISA, say Y, otherwise N.
1438 # Select ISA DMA controller support
1443 # Select ISA DMA interface
1448 bool "PCI support" if MIGHT_HAVE_PCI
1450 Find out whether you have a PCI motherboard. PCI is the name of a
1451 bus system, i.e. the way the CPU talks to the other stuff inside
1452 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1453 VESA. If you have PCI, say Y, otherwise N.
1459 config PCI_NANOENGINE
1460 bool "BSE nanoEngine PCI support"
1461 depends on SA1100_NANOENGINE
1463 Enable PCI on the BSE nanoEngine board.
1468 # Select the host bridge type
1469 config PCI_HOST_VIA82C505
1471 depends on PCI && ARCH_SHARK
1474 config PCI_HOST_ITE8152
1476 depends on PCI && MACH_ARMCORE
1480 source "drivers/pci/Kconfig"
1482 source "drivers/pcmcia/Kconfig"
1486 menu "Kernel Features"
1491 This option should be selected by machines which have an SMP-
1494 The only effect of this option is to make the SMP-related
1495 options available to the user for configuration.
1498 bool "Symmetric Multi-Processing"
1499 depends on CPU_V6K || CPU_V7
1500 depends on GENERIC_CLOCKEVENTS
1503 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1504 select USE_GENERIC_SMP_HELPERS
1506 This enables support for systems with more than one CPU. If you have
1507 a system with only one CPU, like most personal computers, say N. If
1508 you have a system with more than one CPU, say Y.
1510 If you say N here, the kernel will run on single and multiprocessor
1511 machines, but will use only one CPU of a multiprocessor machine. If
1512 you say Y here, the kernel will run on many, but not all, single
1513 processor machines. On a single processor machine, the kernel will
1514 run faster if you say N here.
1516 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1517 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1518 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1520 If you don't know what to do here, say N.
1523 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1524 depends on EXPERIMENTAL
1525 depends on SMP && !XIP_KERNEL
1528 SMP kernels contain instructions which fail on non-SMP processors.
1529 Enabling this option allows the kernel to modify itself to make
1530 these instructions safe. Disabling it allows about 1K of space
1533 If you don't know what to do here, say Y.
1535 config ARM_CPU_TOPOLOGY
1536 bool "Support cpu topology definition"
1537 depends on SMP && CPU_V7
1540 Support ARM cpu topology definition. The MPIDR register defines
1541 affinity between processors which is then used to describe the cpu
1542 topology of an ARM System.
1545 bool "Multi-core scheduler support"
1546 depends on ARM_CPU_TOPOLOGY
1548 Multi-core scheduler support improves the CPU scheduler's decision
1549 making when dealing with multi-core CPU chips at a cost of slightly
1550 increased overhead in some places. If unsure say N here.
1553 bool "SMT scheduler support"
1554 depends on ARM_CPU_TOPOLOGY
1556 Improves the CPU scheduler's decision making when dealing with
1557 MultiThreading at a cost of slightly increased overhead in some
1558 places. If unsure say N here.
1563 This option enables support for the ARM system coherency unit
1565 config ARM_ARCH_TIMER
1566 bool "Architected timer support"
1569 This option enables support for the ARM architected timer
1575 This options enables support for the ARM timer and watchdog unit
1578 prompt "Memory split"
1581 Select the desired split between kernel and user memory.
1583 If you are not absolutely sure what you are doing, leave this
1587 bool "3G/1G user/kernel split"
1589 bool "2G/2G user/kernel split"
1591 bool "1G/3G user/kernel split"
1596 default 0x40000000 if VMSPLIT_1G
1597 default 0x80000000 if VMSPLIT_2G
1601 int "Maximum number of CPUs (2-32)"
1607 bool "Support for hot-pluggable CPUs"
1608 depends on SMP && HOTPLUG
1610 Say Y here to experiment with turning CPUs off and on. CPUs
1611 can be controlled through /sys/devices/system/cpu.
1614 bool "Use local timer interrupts"
1617 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1619 Enable support for local timers on SMP platforms, rather then the
1620 legacy IPI broadcast method. Local timers allows the system
1621 accounting to be spread across the timer interval, preventing a
1622 "thundering herd" at every timer tick.
1626 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1627 default 355 if ARCH_U8500
1628 default 264 if MACH_H4700
1629 default 512 if SOC_OMAP5
1630 default 288 if ARCH_VT8500
1633 Maximum number of GPIOs in the system.
1635 If unsure, leave the default value.
1637 source kernel/Kconfig.preempt
1641 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1642 ARCH_S5PV210 || ARCH_EXYNOS4
1643 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1644 default AT91_TIMER_HZ if ARCH_AT91
1645 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1648 config THUMB2_KERNEL
1649 bool "Compile the kernel in Thumb-2 mode"
1650 depends on CPU_V7 && !CPU_V6 && !CPU_V6K
1652 select ARM_ASM_UNIFIED
1655 By enabling this option, the kernel will be compiled in
1656 Thumb-2 mode. A compiler/assembler that understand the unified
1657 ARM-Thumb syntax is needed.
1661 config THUMB2_AVOID_R_ARM_THM_JUMP11
1662 bool "Work around buggy Thumb-2 short branch relocations in gas"
1663 depends on THUMB2_KERNEL && MODULES
1666 Various binutils versions can resolve Thumb-2 branches to
1667 locally-defined, preemptible global symbols as short-range "b.n"
1668 branch instructions.
1670 This is a problem, because there's no guarantee the final
1671 destination of the symbol, or any candidate locations for a
1672 trampoline, are within range of the branch. For this reason, the
1673 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1674 relocation in modules at all, and it makes little sense to add
1677 The symptom is that the kernel fails with an "unsupported
1678 relocation" error when loading some modules.
1680 Until fixed tools are available, passing
1681 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1682 code which hits this problem, at the cost of a bit of extra runtime
1683 stack usage in some cases.
1685 The problem is described in more detail at:
1686 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1688 Only Thumb-2 kernels are affected.
1690 Unless you are sure your tools don't have this problem, say Y.
1692 config ARM_ASM_UNIFIED
1696 bool "Use the ARM EABI to compile the kernel"
1698 This option allows for the kernel to be compiled using the latest
1699 ARM ABI (aka EABI). This is only useful if you are using a user
1700 space environment that is also compiled with EABI.
1702 Since there are major incompatibilities between the legacy ABI and
1703 EABI, especially with regard to structure member alignment, this
1704 option also changes the kernel syscall calling convention to
1705 disambiguate both ABIs and allow for backward compatibility support
1706 (selected with CONFIG_OABI_COMPAT).
1708 To use this you need GCC version 4.0.0 or later.
1711 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1712 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1715 This option preserves the old syscall interface along with the
1716 new (ARM EABI) one. It also provides a compatibility layer to
1717 intercept syscalls that have structure arguments which layout
1718 in memory differs between the legacy ABI and the new ARM EABI
1719 (only for non "thumb" binaries). This option adds a tiny
1720 overhead to all syscalls and produces a slightly larger kernel.
1721 If you know you'll be using only pure EABI user space then you
1722 can say N here. If this option is not selected and you attempt
1723 to execute a legacy ABI binary then the result will be
1724 UNPREDICTABLE (in fact it can be predicted that it won't work
1725 at all). If in doubt say Y.
1727 config ARCH_HAS_HOLES_MEMORYMODEL
1730 config ARCH_SPARSEMEM_ENABLE
1733 config ARCH_SPARSEMEM_DEFAULT
1734 def_bool ARCH_SPARSEMEM_ENABLE
1736 config ARCH_SELECT_MEMORY_MODEL
1737 def_bool ARCH_SPARSEMEM_ENABLE
1739 config HAVE_ARCH_PFN_VALID
1740 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1743 bool "High Memory Support"
1746 The address space of ARM processors is only 4 Gigabytes large
1747 and it has to accommodate user address space, kernel address
1748 space as well as some memory mapped IO. That means that, if you
1749 have a large amount of physical memory and/or IO, not all of the
1750 memory can be "permanently mapped" by the kernel. The physical
1751 memory that is not permanently mapped is called "high memory".
1753 Depending on the selected kernel/user memory split, minimum
1754 vmalloc space and actual amount of RAM, you may not need this
1755 option which should result in a slightly faster kernel.
1760 bool "Allocate 2nd-level pagetables from highmem"
1763 config HW_PERF_EVENTS
1764 bool "Enable hardware performance counter support for perf events"
1765 depends on PERF_EVENTS
1768 Enable hardware performance counter support for perf events. If
1769 disabled, perf events will use software events only.
1773 config FORCE_MAX_ZONEORDER
1774 int "Maximum zone order" if ARCH_SHMOBILE
1775 range 11 64 if ARCH_SHMOBILE
1776 default "12" if SOC_AM33XX
1777 default "9" if SA1111
1780 The kernel memory allocator divides physically contiguous memory
1781 blocks into "zones", where each zone is a power of two number of
1782 pages. This option selects the largest power of two that the kernel
1783 keeps in the memory allocator. If you need to allocate very large
1784 blocks of physically contiguous memory, then you may need to
1785 increase this value.
1787 This config option is actually maximum order plus one. For example,
1788 a value of 11 means that the largest free memory block is 2^10 pages.
1790 config ALIGNMENT_TRAP
1792 depends on CPU_CP15_MMU
1793 default y if !ARCH_EBSA110
1794 select HAVE_PROC_CPU if PROC_FS
1796 ARM processors cannot fetch/store information which is not
1797 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1798 address divisible by 4. On 32-bit ARM processors, these non-aligned
1799 fetch/store instructions will be emulated in software if you say
1800 here, which has a severe performance impact. This is necessary for
1801 correct operation of some network protocols. With an IP-only
1802 configuration it is safe to say N, otherwise say Y.
1804 config UACCESS_WITH_MEMCPY
1805 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1807 default y if CPU_FEROCEON
1809 Implement faster copy_to_user and clear_user methods for CPU
1810 cores where a 8-word STM instruction give significantly higher
1811 memory write throughput than a sequence of individual 32bit stores.
1813 A possible side effect is a slight increase in scheduling latency
1814 between threads sharing the same address space if they invoke
1815 such copy operations with large buffers.
1817 However, if the CPU data cache is using a write-allocate mode,
1818 this option is unlikely to provide any performance gain.
1822 prompt "Enable seccomp to safely compute untrusted bytecode"
1824 This kernel feature is useful for number crunching applications
1825 that may need to compute untrusted bytecode during their
1826 execution. By using pipes or other transports made available to
1827 the process as file descriptors supporting the read/write
1828 syscalls, it's possible to isolate those applications in
1829 their own address space using seccomp. Once seccomp is
1830 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1831 and the task is only allowed to execute a few safe syscalls
1832 defined by each seccomp mode.
1834 config CC_STACKPROTECTOR
1835 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1836 depends on EXPERIMENTAL
1838 This option turns on the -fstack-protector GCC feature. This
1839 feature puts, at the beginning of functions, a canary value on
1840 the stack just before the return address, and validates
1841 the value just before actually returning. Stack based buffer
1842 overflows (that need to overwrite this return address) now also
1843 overwrite the canary, which gets detected and the attack is then
1844 neutralized via a kernel panic.
1845 This feature requires gcc version 4.2 or above.
1852 bool "Xen guest support on ARM (EXPERIMENTAL)"
1853 depends on EXPERIMENTAL && ARM && OF
1854 depends on CPU_V7 && !CPU_V6
1856 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1863 bool "Flattened Device Tree support"
1866 select OF_EARLY_FLATTREE
1868 Include support for flattened device tree machine descriptions.
1871 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1874 This is the traditional way of passing data to the kernel at boot
1875 time. If you are solely relying on the flattened device tree (or
1876 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1877 to remove ATAGS support from your kernel binary. If unsure,
1880 config DEPRECATED_PARAM_STRUCT
1881 bool "Provide old way to pass kernel parameters"
1884 This was deprecated in 2001 and announced to live on for 5 years.
1885 Some old boot loaders still use this way.
1887 # Compressed boot loader in ROM. Yes, we really want to ask about
1888 # TEXT and BSS so we preserve their values in the config files.
1889 config ZBOOT_ROM_TEXT
1890 hex "Compressed ROM boot loader base address"
1893 The physical address at which the ROM-able zImage is to be
1894 placed in the target. Platforms which normally make use of
1895 ROM-able zImage formats normally set this to a suitable
1896 value in their defconfig file.
1898 If ZBOOT_ROM is not enabled, this has no effect.
1900 config ZBOOT_ROM_BSS
1901 hex "Compressed ROM boot loader BSS address"
1904 The base address of an area of read/write memory in the target
1905 for the ROM-able zImage which must be available while the
1906 decompressor is running. It must be large enough to hold the
1907 entire decompressed kernel plus an additional 128 KiB.
1908 Platforms which normally make use of ROM-able zImage formats
1909 normally set this to a suitable value in their defconfig file.
1911 If ZBOOT_ROM is not enabled, this has no effect.
1914 bool "Compressed boot loader in ROM/flash"
1915 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1917 Say Y here if you intend to execute your compressed kernel image
1918 (zImage) directly from ROM or flash. If unsure, say N.
1921 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1922 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1923 default ZBOOT_ROM_NONE
1925 Include experimental SD/MMC loading code in the ROM-able zImage.
1926 With this enabled it is possible to write the ROM-able zImage
1927 kernel image to an MMC or SD card and boot the kernel straight
1928 from the reset vector. At reset the processor Mask ROM will load
1929 the first part of the ROM-able zImage which in turn loads the
1930 rest the kernel image to RAM.
1932 config ZBOOT_ROM_NONE
1933 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1935 Do not load image from SD or MMC
1937 config ZBOOT_ROM_MMCIF
1938 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1940 Load image from MMCIF hardware block.
1942 config ZBOOT_ROM_SH_MOBILE_SDHI
1943 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1945 Load image from SDHI hardware block
1949 config ARM_APPENDED_DTB
1950 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1951 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1953 With this option, the boot code will look for a device tree binary
1954 (DTB) appended to zImage
1955 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1957 This is meant as a backward compatibility convenience for those
1958 systems with a bootloader that can't be upgraded to accommodate
1959 the documented boot protocol using a device tree.
1961 Beware that there is very little in terms of protection against
1962 this option being confused by leftover garbage in memory that might
1963 look like a DTB header after a reboot if no actual DTB is appended
1964 to zImage. Do not leave this option active in a production kernel
1965 if you don't intend to always append a DTB. Proper passing of the
1966 location into r2 of a bootloader provided DTB is always preferable
1969 config ARM_ATAG_DTB_COMPAT
1970 bool "Supplement the appended DTB with traditional ATAG information"
1971 depends on ARM_APPENDED_DTB
1973 Some old bootloaders can't be updated to a DTB capable one, yet
1974 they provide ATAGs with memory configuration, the ramdisk address,
1975 the kernel cmdline string, etc. Such information is dynamically
1976 provided by the bootloader and can't always be stored in a static
1977 DTB. To allow a device tree enabled kernel to be used with such
1978 bootloaders, this option allows zImage to extract the information
1979 from the ATAG list and store it at run time into the appended DTB.
1982 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1983 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1985 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1986 bool "Use bootloader kernel arguments if available"
1988 Uses the command-line options passed by the boot loader instead of
1989 the device tree bootargs property. If the boot loader doesn't provide
1990 any, the device tree bootargs property will be used.
1992 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1993 bool "Extend with bootloader kernel arguments"
1995 The command-line arguments provided by the boot loader will be
1996 appended to the the device tree bootargs property.
2001 string "Default kernel command string"
2004 On some architectures (EBSA110 and CATS), there is currently no way
2005 for the boot loader to pass arguments to the kernel. For these
2006 architectures, you should supply some command-line options at build
2007 time by entering them here. As a minimum, you should specify the
2008 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2011 prompt "Kernel command line type" if CMDLINE != ""
2012 default CMDLINE_FROM_BOOTLOADER
2015 config CMDLINE_FROM_BOOTLOADER
2016 bool "Use bootloader kernel arguments if available"
2018 Uses the command-line options passed by the boot loader. If
2019 the boot loader doesn't provide any, the default kernel command
2020 string provided in CMDLINE will be used.
2022 config CMDLINE_EXTEND
2023 bool "Extend bootloader kernel arguments"
2025 The command-line arguments provided by the boot loader will be
2026 appended to the default kernel command string.
2028 config CMDLINE_FORCE
2029 bool "Always use the default kernel command string"
2031 Always use the default kernel command string, even if the boot
2032 loader passes other arguments to the kernel.
2033 This is useful if you cannot or don't want to change the
2034 command-line options your boot loader passes to the kernel.
2038 bool "Kernel Execute-In-Place from ROM"
2039 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2041 Execute-In-Place allows the kernel to run from non-volatile storage
2042 directly addressable by the CPU, such as NOR flash. This saves RAM
2043 space since the text section of the kernel is not loaded from flash
2044 to RAM. Read-write sections, such as the data section and stack,
2045 are still copied to RAM. The XIP kernel is not compressed since
2046 it has to run directly from flash, so it will take more space to
2047 store it. The flash address used to link the kernel object files,
2048 and for storing it, is configuration dependent. Therefore, if you
2049 say Y here, you must know the proper physical address where to
2050 store the kernel image depending on your own flash memory usage.
2052 Also note that the make target becomes "make xipImage" rather than
2053 "make zImage" or "make Image". The final kernel binary to put in
2054 ROM memory will be arch/arm/boot/xipImage.
2058 config XIP_PHYS_ADDR
2059 hex "XIP Kernel Physical Location"
2060 depends on XIP_KERNEL
2061 default "0x00080000"
2063 This is the physical address in your flash memory the kernel will
2064 be linked for and stored to. This address is dependent on your
2068 bool "Kexec system call (EXPERIMENTAL)"
2069 depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
2071 kexec is a system call that implements the ability to shutdown your
2072 current kernel, and to start another kernel. It is like a reboot
2073 but it is independent of the system firmware. And like a reboot
2074 you can start any kernel with it, not just Linux.
2076 It is an ongoing process to be certain the hardware in a machine
2077 is properly shutdown, so do not be surprised if this code does not
2078 initially work for you. It may help to enable device hotplugging
2082 bool "Export atags in procfs"
2083 depends on ATAGS && KEXEC
2086 Should the atags used to boot the kernel be exported in an "atags"
2087 file in procfs. Useful with kexec.
2090 bool "Build kdump crash kernel (EXPERIMENTAL)"
2091 depends on EXPERIMENTAL
2093 Generate crash dump after being started by kexec. This should
2094 be normally only set in special crash dump kernels which are
2095 loaded in the main kernel with kexec-tools into a specially
2096 reserved region and then later executed after a crash by
2097 kdump/kexec. The crash dump kernel must be compiled to a
2098 memory address not used by the main kernel
2100 For more details see Documentation/kdump/kdump.txt
2102 config AUTO_ZRELADDR
2103 bool "Auto calculation of the decompressed kernel image address"
2104 depends on !ZBOOT_ROM && !ARCH_U300
2106 ZRELADDR is the physical address where the decompressed kernel
2107 image will be placed. If AUTO_ZRELADDR is selected, the address
2108 will be determined at run-time by masking the current IP with
2109 0xf8000000. This assumes the zImage being placed in the first 128MB
2110 from start of memory.
2114 menu "CPU Power Management"
2118 source "drivers/cpufreq/Kconfig"
2121 tristate "CPUfreq driver for i.MX CPUs"
2122 depends on ARCH_MXC && CPU_FREQ
2123 select CPU_FREQ_TABLE
2125 This enables the CPUfreq driver for i.MX CPUs.
2127 config CPU_FREQ_SA1100
2130 config CPU_FREQ_SA1110
2133 config CPU_FREQ_INTEGRATOR
2134 tristate "CPUfreq driver for ARM Integrator CPUs"
2135 depends on ARCH_INTEGRATOR && CPU_FREQ
2138 This enables the CPUfreq driver for ARM Integrator CPUs.
2140 For details, take a look at <file:Documentation/cpu-freq>.
2146 depends on CPU_FREQ && ARCH_PXA && PXA25x
2148 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2149 select CPU_FREQ_TABLE
2154 Internal configuration node for common cpufreq on Samsung SoC
2156 config CPU_FREQ_S3C24XX
2157 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2158 depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
2161 This enables the CPUfreq driver for the Samsung S3C24XX family
2164 For details, take a look at <file:Documentation/cpu-freq>.
2168 config CPU_FREQ_S3C24XX_PLL
2169 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2170 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2172 Compile in support for changing the PLL frequency from the
2173 S3C24XX series CPUfreq driver. The PLL takes time to settle
2174 after a frequency change, so by default it is not enabled.
2176 This also means that the PLL tables for the selected CPU(s) will
2177 be built which may increase the size of the kernel image.
2179 config CPU_FREQ_S3C24XX_DEBUG
2180 bool "Debug CPUfreq Samsung driver core"
2181 depends on CPU_FREQ_S3C24XX
2183 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2185 config CPU_FREQ_S3C24XX_IODEBUG
2186 bool "Debug CPUfreq Samsung driver IO timing"
2187 depends on CPU_FREQ_S3C24XX
2189 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2191 config CPU_FREQ_S3C24XX_DEBUGFS
2192 bool "Export debugfs for CPUFreq"
2193 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2195 Export status information via debugfs.
2199 source "drivers/cpuidle/Kconfig"
2203 menu "Floating point emulation"
2205 comment "At least one emulation must be selected"
2208 bool "NWFPE math emulation"
2209 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2211 Say Y to include the NWFPE floating point emulator in the kernel.
2212 This is necessary to run most binaries. Linux does not currently
2213 support floating point hardware so you need to say Y here even if
2214 your machine has an FPA or floating point co-processor podule.
2216 You may say N here if you are going to load the Acorn FPEmulator
2217 early in the bootup.
2220 bool "Support extended precision"
2221 depends on FPE_NWFPE
2223 Say Y to include 80-bit support in the kernel floating-point
2224 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2225 Note that gcc does not generate 80-bit operations by default,
2226 so in most cases this option only enlarges the size of the
2227 floating point emulator without any good reason.
2229 You almost surely want to say N here.
2232 bool "FastFPE math emulation (EXPERIMENTAL)"
2233 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2235 Say Y here to include the FAST floating point emulator in the kernel.
2236 This is an experimental much faster emulator which now also has full
2237 precision for the mantissa. It does not support any exceptions.
2238 It is very simple, and approximately 3-6 times faster than NWFPE.
2240 It should be sufficient for most programs. It may be not suitable
2241 for scientific calculations, but you have to check this for yourself.
2242 If you do not feel you need a faster FP emulation you should better
2246 bool "VFP-format floating point maths"
2247 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2249 Say Y to include VFP support code in the kernel. This is needed
2250 if your hardware includes a VFP unit.
2252 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2253 release notes and additional status information.
2255 Say N if your target does not have VFP hardware.
2263 bool "Advanced SIMD (NEON) Extension support"
2264 depends on VFPv3 && CPU_V7
2266 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2271 menu "Userspace binary formats"
2273 source "fs/Kconfig.binfmt"
2276 tristate "RISC OS personality"
2279 Say Y here to include the kernel code necessary if you want to run
2280 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2281 experimental; if this sounds frightening, say N and sleep in peace.
2282 You can also say M here to compile this support as a module (which
2283 will be called arthur).
2287 menu "Power management options"
2289 source "kernel/power/Kconfig"
2291 config ARCH_SUSPEND_POSSIBLE
2292 depends on !ARCH_S5PC100
2293 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2294 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2297 config ARM_CPU_SUSPEND
2302 source "net/Kconfig"
2304 source "drivers/Kconfig"
2308 source "arch/arm/Kconfig.debug"
2310 source "security/Kconfig"
2312 source "crypto/Kconfig"
2314 source "lib/Kconfig"