4 select ARCH_HAVE_CUSTOM_GPIO_H
6 select HAVE_DMA_API_DEBUG
7 select HAVE_IDE if PCI || ISA || PCMCIA
9 select HAVE_DMA_CONTIGUOUS if MMU
12 select SYS_SUPPORTS_APM_EMULATION
13 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
14 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
15 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
16 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
18 select HAVE_ARCH_TRACEHOOK
19 select HAVE_SYSCALL_TRACEPOINTS
20 select HAVE_KPROBES if !XIP_KERNEL
21 select HAVE_KRETPROBES if (HAVE_KPROBES)
22 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
23 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
24 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
25 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
26 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
27 select HAVE_GENERIC_DMA_COHERENT
28 select HAVE_KERNEL_GZIP
29 select HAVE_KERNEL_LZO
30 select HAVE_KERNEL_LZMA
33 select HAVE_PERF_EVENTS
34 select PERF_USE_VMALLOC
35 select HAVE_REGS_AND_STACK_ACCESS_API
36 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
37 select HAVE_C_RECORDMCOUNT
38 select HAVE_GENERIC_HARDIRQS
39 select HARDIRQS_SW_RESEND
40 select GENERIC_IRQ_PROBE
41 select GENERIC_IRQ_SHOW
43 select ARCH_WANT_IPC_PARSE_VERSION
44 select HARDIRQS_SW_RESEND
45 select CPU_PM if (SUSPEND || CPU_IDLE)
46 select GENERIC_PCI_IOMAP
48 select GENERIC_SMP_IDLE_THREAD
50 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
51 select GENERIC_STRNCPY_FROM_USER
52 select GENERIC_STRNLEN_USER
53 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN
55 The ARM series is a line of low-power-consumption RISC chip designs
56 licensed by ARM Ltd and targeted at embedded applications and
57 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
58 manufactured, but legacy ARM-based PC hardware remains popular in
59 Europe. There is an ARM Linux project with a web page at
60 <http://www.arm.linux.org.uk/>.
62 config ARM_HAS_SG_CHAIN
65 config NEED_SG_DMA_LENGTH
68 config ARM_DMA_USE_IOMMU
69 select NEED_SG_DMA_LENGTH
70 select ARM_HAS_SG_CHAIN
79 config SYS_SUPPORTS_APM_EMULATION
87 select GENERIC_ALLOCATOR
98 The Extended Industry Standard Architecture (EISA) bus was
99 developed as an open alternative to the IBM MicroChannel bus.
101 The EISA bus provided some of the features of the IBM MicroChannel
102 bus while maintaining backward compatibility with cards made for
103 the older ISA bus. The EISA bus saw limited use between 1988 and
104 1995 when it was made obsolete by the PCI bus.
106 Say Y here if you are building a kernel for an EISA-based machine.
113 config STACKTRACE_SUPPORT
117 config HAVE_LATENCYTOP_SUPPORT
122 config LOCKDEP_SUPPORT
126 config TRACE_IRQFLAGS_SUPPORT
130 config RWSEM_GENERIC_SPINLOCK
134 config RWSEM_XCHGADD_ALGORITHM
137 config ARCH_HAS_ILOG2_U32
140 config ARCH_HAS_ILOG2_U64
143 config ARCH_HAS_CPUFREQ
146 Internal node to signify that the ARCH has CPUFREQ support
147 and that the relevant menu configurations are displayed for
150 config GENERIC_HWEIGHT
154 config GENERIC_CALIBRATE_DELAY
158 config ARCH_MAY_HAVE_PC_FDC
164 config NEED_DMA_MAP_STATE
167 config ARCH_HAS_DMA_SET_COHERENT_MASK
170 config GENERIC_ISA_DMA
176 config NEED_RET_TO_USER
184 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
185 default DRAM_BASE if REMAP_VECTORS_TO_RAM
188 The base address of exception vectors.
190 config ARM_PATCH_PHYS_VIRT
191 bool "Patch physical to virtual translations at runtime" if EMBEDDED
193 depends on !XIP_KERNEL && MMU
194 depends on !ARCH_REALVIEW || !SPARSEMEM
196 Patch phys-to-virt and virt-to-phys translation functions at
197 boot and module load time according to the position of the
198 kernel in system memory.
200 This can only be used with non-XIP MMU kernels where the base
201 of physical memory is at a 16MB boundary.
203 Only disable this option if you know that you do not require
204 this feature (eg, building a kernel for a single machine) and
205 you need to shrink the kernel to the minimal size.
207 config NEED_MACH_GPIO_H
210 Select this when mach/gpio.h is required to provide special
211 definitions for this platform. The need for mach/gpio.h should
212 be avoided when possible.
214 config NEED_MACH_IO_H
217 Select this when mach/io.h is required to provide special
218 definitions for this platform. The need for mach/io.h should
219 be avoided when possible.
221 config NEED_MACH_MEMORY_H
224 Select this when mach/memory.h is required to provide special
225 definitions for this platform. The need for mach/memory.h should
226 be avoided when possible.
229 hex "Physical address of main memory" if MMU
230 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
231 default DRAM_BASE if !MMU
233 Please provide the physical address corresponding to the
234 location of main memory in your system.
240 source "init/Kconfig"
242 source "kernel/Kconfig.freezer"
247 bool "MMU-based Paged Memory Management Support"
250 Select if you want MMU-based virtualised addressing space
251 support by paged memory management. If unsure, say 'Y'.
254 # The "ARM system type" choice list is ordered alphabetically by option
255 # text. Please add new entries in the option alphabetic order.
258 prompt "ARM system type"
259 default ARCH_MULTIPLATFORM
261 config ARCH_MULTIPLATFORM
262 bool "Allow multiple platforms to be selected"
263 select ARM_PATCH_PHYS_VIRT
266 select MULTI_IRQ_HANDLER
271 config ARCH_INTEGRATOR
272 bool "ARM Ltd. Integrator family"
274 select ARCH_HAS_CPUFREQ
276 select COMMON_CLK_VERSATILE
279 select GENERIC_CLOCKEVENTS
280 select PLAT_VERSATILE
281 select PLAT_VERSATILE_FPGA_IRQ
282 select NEED_MACH_MEMORY_H
284 select MULTI_IRQ_HANDLER
286 Support for ARM's Integrator platform.
289 bool "ARM Ltd. RealView family"
292 select COMMON_CLK_VERSATILE
294 select GENERIC_CLOCKEVENTS
295 select ARCH_WANT_OPTIONAL_GPIOLIB
296 select PLAT_VERSATILE
297 select PLAT_VERSATILE_CLCD
298 select ARM_TIMER_SP804
299 select GPIO_PL061 if GPIOLIB
300 select NEED_MACH_MEMORY_H
302 This enables support for ARM Ltd RealView boards.
304 config ARCH_VERSATILE
305 bool "ARM Ltd. Versatile family"
309 select HAVE_MACH_CLKDEV
311 select GENERIC_CLOCKEVENTS
312 select ARCH_WANT_OPTIONAL_GPIOLIB
313 select PLAT_VERSATILE
314 select PLAT_VERSATILE_CLOCK
315 select PLAT_VERSATILE_CLCD
316 select PLAT_VERSATILE_FPGA_IRQ
317 select ARM_TIMER_SP804
319 This enables support for ARM Ltd Versatile board.
323 select ARCH_REQUIRE_GPIOLIB
327 select NEED_MACH_GPIO_H
328 select NEED_MACH_IO_H if PCCARD
330 This enables support for systems based on Atmel
331 AT91RM9200 and AT91SAM9* processors.
334 bool "Broadcom BCM2835 family"
335 select ARCH_WANT_OPTIONAL_GPIOLIB
337 select ARM_ERRATA_411920
338 select ARM_TIMER_SP804
342 select GENERIC_CLOCKEVENTS
343 select MULTI_IRQ_HANDLER
347 This enables support for the Broadcom BCM2835 SoC. This SoC is
348 use in the Raspberry Pi, and Roku 2 devices.
351 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
353 select ARCH_USES_GETTIMEOFFSET
356 select NEED_MACH_MEMORY_H
358 Support for Cirrus Logic 711x/721x/731x based boards.
361 bool "Cavium Networks CNS3XXX family"
363 select GENERIC_CLOCKEVENTS
365 select MIGHT_HAVE_CACHE_L2X0
366 select MIGHT_HAVE_PCI
367 select PCI_DOMAINS if PCI
369 Support for Cavium Networks CNS3XXX platform.
372 bool "Cortina Systems Gemini"
374 select ARCH_REQUIRE_GPIOLIB
375 select ARCH_USES_GETTIMEOFFSET
377 Support for the Cortina Systems Gemini family SoCs
382 select ARCH_REQUIRE_GPIOLIB
383 select GENERIC_CLOCKEVENTS
385 select GENERIC_IRQ_CHIP
386 select MIGHT_HAVE_CACHE_L2X0
391 Support for CSR SiRFprimaII/Marco/Polo platforms
398 select ARCH_USES_GETTIMEOFFSET
399 select NEED_MACH_IO_H
400 select NEED_MACH_MEMORY_H
402 This is an evaluation board for the StrongARM processor available
403 from Digital. It has limited hardware on-board, including an
404 Ethernet interface, two PCMCIA sockets, two serial ports and a
413 select ARCH_REQUIRE_GPIOLIB
414 select ARCH_HAS_HOLES_MEMORYMODEL
415 select ARCH_USES_GETTIMEOFFSET
416 select NEED_MACH_MEMORY_H
418 This enables support for the Cirrus EP93xx series of CPUs.
420 config ARCH_FOOTBRIDGE
424 select GENERIC_CLOCKEVENTS
426 select NEED_MACH_IO_H if !MMU
427 select NEED_MACH_MEMORY_H
429 Support for systems based on the DC21285 companion chip
430 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
433 bool "Freescale MXC/iMX-based"
434 select GENERIC_CLOCKEVENTS
435 select ARCH_REQUIRE_GPIOLIB
438 select GENERIC_IRQ_CHIP
439 select MULTI_IRQ_HANDLER
443 Support for Freescale MXC/iMX-based family of processors
446 bool "Freescale MXS-based"
447 select GENERIC_CLOCKEVENTS
448 select ARCH_REQUIRE_GPIOLIB
452 select HAVE_CLK_PREPARE
453 select MULTI_IRQ_HANDLER
458 Support for Freescale MXS-based family of processors
461 bool "Hilscher NetX based"
465 select GENERIC_CLOCKEVENTS
467 This enables support for systems based on the Hilscher NetX Soc
470 bool "Hynix HMS720x-based"
473 select ARCH_USES_GETTIMEOFFSET
475 This enables support for systems based on the Hynix HMS720x
483 select ARCH_SUPPORTS_MSI
485 select NEED_MACH_MEMORY_H
486 select NEED_RET_TO_USER
488 Support for Intel's IOP13XX (XScale) family of processors.
494 select NEED_MACH_GPIO_H
495 select NEED_MACH_IO_H
496 select NEED_RET_TO_USER
499 select ARCH_REQUIRE_GPIOLIB
501 Support for Intel's 80219 and IOP32X (XScale) family of
508 select NEED_MACH_GPIO_H
509 select NEED_MACH_IO_H
510 select NEED_RET_TO_USER
513 select ARCH_REQUIRE_GPIOLIB
515 Support for Intel's IOP33X (XScale) family of processors.
520 select ARCH_HAS_DMA_SET_COHERENT_MASK
523 select ARCH_REQUIRE_GPIOLIB
524 select GENERIC_CLOCKEVENTS
525 select MIGHT_HAVE_PCI
526 select NEED_MACH_IO_H
527 select DMABOUNCE if PCI
529 Support for Intel's IXP4XX (XScale) family of processors.
534 select ARCH_REQUIRE_GPIOLIB
535 select GENERIC_CLOCKEVENTS
536 select MIGHT_HAVE_PCI
537 select PLAT_ORION_LEGACY
538 select USB_ARCH_HAS_EHCI
540 Support for the Marvell Dove SoC 88AP510
543 bool "Marvell Kirkwood"
546 select ARCH_REQUIRE_GPIOLIB
547 select GENERIC_CLOCKEVENTS
548 select PLAT_ORION_LEGACY
550 Support for the following Marvell Kirkwood series SoCs:
551 88F6180, 88F6192 and 88F6281.
557 select ARCH_REQUIRE_GPIOLIB
560 select USB_ARCH_HAS_OHCI
562 select GENERIC_CLOCKEVENTS
566 Support for the NXP LPC32XX family of processors
569 bool "Marvell MV78xx0"
572 select ARCH_REQUIRE_GPIOLIB
573 select GENERIC_CLOCKEVENTS
574 select PLAT_ORION_LEGACY
576 Support for the following Marvell MV78xx0 series SoCs:
584 select ARCH_REQUIRE_GPIOLIB
585 select GENERIC_CLOCKEVENTS
586 select PLAT_ORION_LEGACY
588 Support for the following Marvell Orion 5x series SoCs:
589 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
590 Orion-2 (5281), Orion-1-90 (6183).
593 bool "Marvell PXA168/910/MMP2"
595 select ARCH_REQUIRE_GPIOLIB
597 select GENERIC_CLOCKEVENTS
602 select GENERIC_ALLOCATOR
603 select NEED_MACH_GPIO_H
605 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
608 bool "Micrel/Kendin KS8695"
610 select ARCH_REQUIRE_GPIOLIB
611 select NEED_MACH_MEMORY_H
613 select GENERIC_CLOCKEVENTS
615 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
616 System-on-Chip devices.
619 bool "Nuvoton W90X900 CPU"
621 select ARCH_REQUIRE_GPIOLIB
624 select GENERIC_CLOCKEVENTS
626 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
627 At present, the w90x900 has been renamed nuc900, regarding
628 the ARM series product line, you can login the following
629 link address to know more.
631 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
632 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
638 select GENERIC_CLOCKEVENTS
642 select MIGHT_HAVE_CACHE_L2X0
643 select ARCH_HAS_CPUFREQ
647 This enables support for NVIDIA Tegra based systems (Tegra APX,
648 Tegra 6xx and Tegra 2 series).
651 bool "PXA2xx/PXA3xx-based"
654 select ARCH_HAS_CPUFREQ
657 select ARCH_REQUIRE_GPIOLIB
658 select GENERIC_CLOCKEVENTS
663 select MULTI_IRQ_HANDLER
664 select ARM_CPU_SUSPEND if PM
666 select NEED_MACH_GPIO_H
668 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
673 select GENERIC_CLOCKEVENTS
674 select ARCH_REQUIRE_GPIOLIB
677 Support for Qualcomm MSM/QSD based systems. This runs on the
678 apps processor of the MSM/QSD and depends on a shared memory
679 interface to the modem processor which runs the baseband
680 stack and controls some vital subsystems
681 (clock and power control, etc).
684 bool "Renesas SH-Mobile / R-Mobile"
687 select HAVE_MACH_CLKDEV
689 select GENERIC_CLOCKEVENTS
690 select MIGHT_HAVE_CACHE_L2X0
693 select MULTI_IRQ_HANDLER
694 select PM_GENERIC_DOMAINS if PM
695 select NEED_MACH_MEMORY_H
697 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
703 select ARCH_MAY_HAVE_PC_FDC
704 select HAVE_PATA_PLATFORM
707 select ARCH_SPARSEMEM_ENABLE
708 select ARCH_USES_GETTIMEOFFSET
710 select NEED_MACH_IO_H
711 select NEED_MACH_MEMORY_H
713 On the Acorn Risc-PC, Linux can support the internal IDE disk and
714 CD-ROM interface, serial and parallel port, and the floppy drive.
721 select ARCH_SPARSEMEM_ENABLE
723 select ARCH_HAS_CPUFREQ
725 select GENERIC_CLOCKEVENTS
727 select ARCH_REQUIRE_GPIOLIB
729 select NEED_MACH_GPIO_H
730 select NEED_MACH_MEMORY_H
733 Support for StrongARM 11x0 based boards.
736 bool "Samsung S3C24XX SoCs"
738 select ARCH_HAS_CPUFREQ
741 select ARCH_USES_GETTIMEOFFSET
742 select HAVE_S3C2410_I2C if I2C
743 select HAVE_S3C_RTC if RTC_CLASS
744 select HAVE_S3C2410_WATCHDOG if WATCHDOG
745 select NEED_MACH_GPIO_H
746 select NEED_MACH_IO_H
748 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
749 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
750 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
751 Samsung SMDK2410 development board (and derivatives).
754 bool "Samsung S3C64XX"
762 select ARCH_USES_GETTIMEOFFSET
763 select ARCH_HAS_CPUFREQ
764 select ARCH_REQUIRE_GPIOLIB
765 select SAMSUNG_CLKSRC
766 select SAMSUNG_IRQ_VIC_TIMER
767 select S3C_GPIO_TRACK
769 select USB_ARCH_HAS_OHCI
770 select SAMSUNG_GPIOLIB_4BIT
771 select HAVE_S3C2410_I2C if I2C
772 select HAVE_S3C2410_WATCHDOG if WATCHDOG
773 select NEED_MACH_GPIO_H
775 Samsung S3C64XX series based systems
778 bool "Samsung S5P6440 S5P6450"
784 select HAVE_S3C2410_WATCHDOG if WATCHDOG
785 select GENERIC_CLOCKEVENTS
786 select HAVE_S3C2410_I2C if I2C
787 select HAVE_S3C_RTC if RTC_CLASS
788 select NEED_MACH_GPIO_H
790 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
794 bool "Samsung S5PC100"
799 select ARCH_USES_GETTIMEOFFSET
800 select HAVE_S3C2410_I2C if I2C
801 select HAVE_S3C_RTC if RTC_CLASS
802 select HAVE_S3C2410_WATCHDOG if WATCHDOG
803 select NEED_MACH_GPIO_H
805 Samsung S5PC100 series based systems
808 bool "Samsung S5PV210/S5PC110"
810 select ARCH_SPARSEMEM_ENABLE
811 select ARCH_HAS_HOLES_MEMORYMODEL
816 select ARCH_HAS_CPUFREQ
817 select GENERIC_CLOCKEVENTS
818 select HAVE_S3C2410_I2C if I2C
819 select HAVE_S3C_RTC if RTC_CLASS
820 select HAVE_S3C2410_WATCHDOG if WATCHDOG
821 select NEED_MACH_GPIO_H
822 select NEED_MACH_MEMORY_H
824 Samsung S5PV210/S5PC110 series based systems
827 bool "SAMSUNG EXYNOS"
829 select ARCH_SPARSEMEM_ENABLE
830 select ARCH_HAS_HOLES_MEMORYMODEL
834 select ARCH_HAS_CPUFREQ
835 select GENERIC_CLOCKEVENTS
836 select HAVE_S3C_RTC if RTC_CLASS
837 select HAVE_S3C2410_I2C if I2C
838 select HAVE_S3C2410_WATCHDOG if WATCHDOG
839 select NEED_MACH_GPIO_H
840 select NEED_MACH_MEMORY_H
842 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
851 select ARCH_USES_GETTIMEOFFSET
852 select NEED_MACH_MEMORY_H
854 Support for the StrongARM based Digital DNARD machine, also known
855 as "Shark" (<http://www.shark-linux.de/shark.html>).
858 bool "ST-Ericsson U300 Series"
864 select ARM_PATCH_PHYS_VIRT
866 select GENERIC_CLOCKEVENTS
870 select ARCH_REQUIRE_GPIOLIB
873 Support for ST-Ericsson U300 series mobile platforms.
876 bool "ST-Ericsson U8500 Series"
880 select GENERIC_CLOCKEVENTS
882 select ARCH_REQUIRE_GPIOLIB
883 select ARCH_HAS_CPUFREQ
885 select MIGHT_HAVE_CACHE_L2X0
887 Support for ST-Ericsson's Ux500 architecture
890 bool "STMicroelectronics Nomadik"
895 select GENERIC_CLOCKEVENTS
897 select PINCTRL_STN8815
898 select MIGHT_HAVE_CACHE_L2X0
899 select ARCH_REQUIRE_GPIOLIB
901 Support for the Nomadik platform by ST-Ericsson
905 select GENERIC_CLOCKEVENTS
906 select ARCH_REQUIRE_GPIOLIB
910 select GENERIC_ALLOCATOR
911 select GENERIC_IRQ_CHIP
912 select ARCH_HAS_HOLES_MEMORYMODEL
913 select NEED_MACH_GPIO_H
915 Support for TI's DaVinci platform.
921 select ARCH_REQUIRE_GPIOLIB
922 select ARCH_HAS_CPUFREQ
924 select GENERIC_CLOCKEVENTS
925 select ARCH_HAS_HOLES_MEMORYMODEL
926 select NEED_MACH_GPIO_H
928 Support for TI's OMAP platform (OMAP1/2/3/4).
933 select ARCH_REQUIRE_GPIOLIB
937 select GENERIC_CLOCKEVENTS
940 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
943 bool "VIA/WonderMedia 85xx"
946 select ARCH_HAS_CPUFREQ
947 select GENERIC_CLOCKEVENTS
948 select ARCH_REQUIRE_GPIOLIB
954 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
957 bool "Xilinx Zynq ARM Cortex A9 Platform"
959 select GENERIC_CLOCKEVENTS
964 select MIGHT_HAVE_CACHE_L2X0
967 Support for Xilinx Zynq ARM Cortex A9 Platform
970 menu "Multiple platform selection"
971 depends on ARCH_MULTIPLATFORM
973 comment "CPU Core family selection"
976 bool "ARMv4 based platforms (FA526, StrongARM)"
977 select ARCH_MULTI_V4_V5
978 depends on !ARCH_MULTI_V6_V7
980 config ARCH_MULTI_V4T
981 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
982 select ARCH_MULTI_V4_V5
983 depends on !ARCH_MULTI_V6_V7
986 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
987 select ARCH_MULTI_V4_V5
988 depends on !ARCH_MULTI_V6_V7
990 config ARCH_MULTI_V4_V5
994 bool "ARMv6 based platforms (ARM11, Scorpion, ...)"
996 select ARCH_MULTI_V6_V7
999 bool "ARMv7 based platforms (Cortex-A, PJ4, Krait)"
1001 select ARCH_VEXPRESS
1003 select ARCH_MULTI_V6_V7
1005 config ARCH_MULTI_V6_V7
1008 config ARCH_MULTI_CPU_AUTO
1009 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
1010 select ARCH_MULTI_V5
1015 # This is sorted alphabetically by mach-* pathname. However, plat-*
1016 # Kconfigs may be included either alphabetically (according to the
1017 # plat- suffix) or along side the corresponding mach-* source.
1019 source "arch/arm/mach-mvebu/Kconfig"
1021 source "arch/arm/mach-at91/Kconfig"
1023 source "arch/arm/mach-clps711x/Kconfig"
1025 source "arch/arm/mach-cns3xxx/Kconfig"
1027 source "arch/arm/mach-davinci/Kconfig"
1029 source "arch/arm/mach-dove/Kconfig"
1031 source "arch/arm/mach-ep93xx/Kconfig"
1033 source "arch/arm/mach-footbridge/Kconfig"
1035 source "arch/arm/mach-gemini/Kconfig"
1037 source "arch/arm/mach-h720x/Kconfig"
1039 source "arch/arm/mach-highbank/Kconfig"
1041 source "arch/arm/mach-integrator/Kconfig"
1043 source "arch/arm/mach-iop32x/Kconfig"
1045 source "arch/arm/mach-iop33x/Kconfig"
1047 source "arch/arm/mach-iop13xx/Kconfig"
1049 source "arch/arm/mach-ixp4xx/Kconfig"
1051 source "arch/arm/mach-kirkwood/Kconfig"
1053 source "arch/arm/mach-ks8695/Kconfig"
1055 source "arch/arm/mach-msm/Kconfig"
1057 source "arch/arm/mach-mv78xx0/Kconfig"
1059 source "arch/arm/plat-mxc/Kconfig"
1061 source "arch/arm/mach-mxs/Kconfig"
1063 source "arch/arm/mach-netx/Kconfig"
1065 source "arch/arm/mach-nomadik/Kconfig"
1066 source "arch/arm/plat-nomadik/Kconfig"
1068 source "arch/arm/plat-omap/Kconfig"
1070 source "arch/arm/mach-omap1/Kconfig"
1072 source "arch/arm/mach-omap2/Kconfig"
1074 source "arch/arm/mach-orion5x/Kconfig"
1076 source "arch/arm/mach-picoxcell/Kconfig"
1078 source "arch/arm/mach-pxa/Kconfig"
1079 source "arch/arm/plat-pxa/Kconfig"
1081 source "arch/arm/mach-mmp/Kconfig"
1083 source "arch/arm/mach-realview/Kconfig"
1085 source "arch/arm/mach-sa1100/Kconfig"
1087 source "arch/arm/plat-samsung/Kconfig"
1088 source "arch/arm/plat-s3c24xx/Kconfig"
1090 source "arch/arm/mach-socfpga/Kconfig"
1092 source "arch/arm/plat-spear/Kconfig"
1094 source "arch/arm/mach-s3c24xx/Kconfig"
1096 source "arch/arm/mach-s3c2412/Kconfig"
1097 source "arch/arm/mach-s3c2440/Kconfig"
1101 source "arch/arm/mach-s3c64xx/Kconfig"
1104 source "arch/arm/mach-s5p64x0/Kconfig"
1106 source "arch/arm/mach-s5pc100/Kconfig"
1108 source "arch/arm/mach-s5pv210/Kconfig"
1110 source "arch/arm/mach-exynos/Kconfig"
1112 source "arch/arm/mach-shmobile/Kconfig"
1114 source "arch/arm/mach-prima2/Kconfig"
1116 source "arch/arm/mach-tegra/Kconfig"
1118 source "arch/arm/mach-u300/Kconfig"
1120 source "arch/arm/mach-ux500/Kconfig"
1122 source "arch/arm/mach-versatile/Kconfig"
1124 source "arch/arm/mach-vexpress/Kconfig"
1125 source "arch/arm/plat-versatile/Kconfig"
1127 source "arch/arm/mach-w90x900/Kconfig"
1129 # Definitions to make life easier
1135 select GENERIC_CLOCKEVENTS
1140 select GENERIC_IRQ_CHIP
1144 config PLAT_ORION_LEGACY
1151 config PLAT_VERSATILE
1154 config ARM_TIMER_SP804
1157 select HAVE_SCHED_CLOCK
1159 source arch/arm/mm/Kconfig
1163 default 16 if ARCH_EP93XX
1167 bool "Enable iWMMXt support"
1168 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1169 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1171 Enable support for iWMMXt context switching at run time if
1172 running on a CPU that supports it.
1176 depends on CPU_XSCALE
1179 config MULTI_IRQ_HANDLER
1182 Allow each machine to specify it's own IRQ handler at run time.
1185 source "arch/arm/Kconfig-nommu"
1188 config ARM_ERRATA_326103
1189 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1192 Executing a SWP instruction to read-only memory does not set bit 11
1193 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1194 treat the access as a read, preventing a COW from occurring and
1195 causing the faulting task to livelock.
1197 config ARM_ERRATA_411920
1198 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1199 depends on CPU_V6 || CPU_V6K
1201 Invalidation of the Instruction Cache operation can
1202 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1203 It does not affect the MPCore. This option enables the ARM Ltd.
1204 recommended workaround.
1206 config ARM_ERRATA_430973
1207 bool "ARM errata: Stale prediction on replaced interworking branch"
1210 This option enables the workaround for the 430973 Cortex-A8
1211 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1212 interworking branch is replaced with another code sequence at the
1213 same virtual address, whether due to self-modifying code or virtual
1214 to physical address re-mapping, Cortex-A8 does not recover from the
1215 stale interworking branch prediction. This results in Cortex-A8
1216 executing the new code sequence in the incorrect ARM or Thumb state.
1217 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1218 and also flushes the branch target cache at every context switch.
1219 Note that setting specific bits in the ACTLR register may not be
1220 available in non-secure mode.
1222 config ARM_ERRATA_458693
1223 bool "ARM errata: Processor deadlock when a false hazard is created"
1226 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1227 erratum. For very specific sequences of memory operations, it is
1228 possible for a hazard condition intended for a cache line to instead
1229 be incorrectly associated with a different cache line. This false
1230 hazard might then cause a processor deadlock. The workaround enables
1231 the L1 caching of the NEON accesses and disables the PLD instruction
1232 in the ACTLR register. Note that setting specific bits in the ACTLR
1233 register may not be available in non-secure mode.
1235 config ARM_ERRATA_460075
1236 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1239 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1240 erratum. Any asynchronous access to the L2 cache may encounter a
1241 situation in which recent store transactions to the L2 cache are lost
1242 and overwritten with stale memory contents from external memory. The
1243 workaround disables the write-allocate mode for the L2 cache via the
1244 ACTLR register. Note that setting specific bits in the ACTLR register
1245 may not be available in non-secure mode.
1247 config ARM_ERRATA_742230
1248 bool "ARM errata: DMB operation may be faulty"
1249 depends on CPU_V7 && SMP
1251 This option enables the workaround for the 742230 Cortex-A9
1252 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1253 between two write operations may not ensure the correct visibility
1254 ordering of the two writes. This workaround sets a specific bit in
1255 the diagnostic register of the Cortex-A9 which causes the DMB
1256 instruction to behave as a DSB, ensuring the correct behaviour of
1259 config ARM_ERRATA_742231
1260 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1261 depends on CPU_V7 && SMP
1263 This option enables the workaround for the 742231 Cortex-A9
1264 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1265 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1266 accessing some data located in the same cache line, may get corrupted
1267 data due to bad handling of the address hazard when the line gets
1268 replaced from one of the CPUs at the same time as another CPU is
1269 accessing it. This workaround sets specific bits in the diagnostic
1270 register of the Cortex-A9 which reduces the linefill issuing
1271 capabilities of the processor.
1273 config PL310_ERRATA_588369
1274 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1275 depends on CACHE_L2X0
1277 The PL310 L2 cache controller implements three types of Clean &
1278 Invalidate maintenance operations: by Physical Address
1279 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1280 They are architecturally defined to behave as the execution of a
1281 clean operation followed immediately by an invalidate operation,
1282 both performing to the same memory location. This functionality
1283 is not correctly implemented in PL310 as clean lines are not
1284 invalidated as a result of these operations.
1286 config ARM_ERRATA_720789
1287 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1290 This option enables the workaround for the 720789 Cortex-A9 (prior to
1291 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1292 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1293 As a consequence of this erratum, some TLB entries which should be
1294 invalidated are not, resulting in an incoherency in the system page
1295 tables. The workaround changes the TLB flushing routines to invalidate
1296 entries regardless of the ASID.
1298 config PL310_ERRATA_727915
1299 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1300 depends on CACHE_L2X0
1302 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1303 operation (offset 0x7FC). This operation runs in background so that
1304 PL310 can handle normal accesses while it is in progress. Under very
1305 rare circumstances, due to this erratum, write data can be lost when
1306 PL310 treats a cacheable write transaction during a Clean &
1307 Invalidate by Way operation.
1309 config ARM_ERRATA_743622
1310 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1313 This option enables the workaround for the 743622 Cortex-A9
1314 (r2p*) erratum. Under very rare conditions, a faulty
1315 optimisation in the Cortex-A9 Store Buffer may lead to data
1316 corruption. This workaround sets a specific bit in the diagnostic
1317 register of the Cortex-A9 which disables the Store Buffer
1318 optimisation, preventing the defect from occurring. This has no
1319 visible impact on the overall performance or power consumption of the
1322 config ARM_ERRATA_751472
1323 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1326 This option enables the workaround for the 751472 Cortex-A9 (prior
1327 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1328 completion of a following broadcasted operation if the second
1329 operation is received by a CPU before the ICIALLUIS has completed,
1330 potentially leading to corrupted entries in the cache or TLB.
1332 config PL310_ERRATA_753970
1333 bool "PL310 errata: cache sync operation may be faulty"
1334 depends on CACHE_PL310
1336 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1338 Under some condition the effect of cache sync operation on
1339 the store buffer still remains when the operation completes.
1340 This means that the store buffer is always asked to drain and
1341 this prevents it from merging any further writes. The workaround
1342 is to replace the normal offset of cache sync operation (0x730)
1343 by another offset targeting an unmapped PL310 register 0x740.
1344 This has the same effect as the cache sync operation: store buffer
1345 drain and waiting for all buffers empty.
1347 config ARM_ERRATA_754322
1348 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1351 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1352 r3p*) erratum. A speculative memory access may cause a page table walk
1353 which starts prior to an ASID switch but completes afterwards. This
1354 can populate the micro-TLB with a stale entry which may be hit with
1355 the new ASID. This workaround places two dsb instructions in the mm
1356 switching code so that no page table walks can cross the ASID switch.
1358 config ARM_ERRATA_754327
1359 bool "ARM errata: no automatic Store Buffer drain"
1360 depends on CPU_V7 && SMP
1362 This option enables the workaround for the 754327 Cortex-A9 (prior to
1363 r2p0) erratum. The Store Buffer does not have any automatic draining
1364 mechanism and therefore a livelock may occur if an external agent
1365 continuously polls a memory location waiting to observe an update.
1366 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1367 written polling loops from denying visibility of updates to memory.
1369 config ARM_ERRATA_364296
1370 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1371 depends on CPU_V6 && !SMP
1373 This options enables the workaround for the 364296 ARM1136
1374 r0p2 erratum (possible cache data corruption with
1375 hit-under-miss enabled). It sets the undocumented bit 31 in
1376 the auxiliary control register and the FI bit in the control
1377 register, thus disabling hit-under-miss without putting the
1378 processor into full low interrupt latency mode. ARM11MPCore
1381 config ARM_ERRATA_764369
1382 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1383 depends on CPU_V7 && SMP
1385 This option enables the workaround for erratum 764369
1386 affecting Cortex-A9 MPCore with two or more processors (all
1387 current revisions). Under certain timing circumstances, a data
1388 cache line maintenance operation by MVA targeting an Inner
1389 Shareable memory region may fail to proceed up to either the
1390 Point of Coherency or to the Point of Unification of the
1391 system. This workaround adds a DSB instruction before the
1392 relevant cache maintenance functions and sets a specific bit
1393 in the diagnostic control register of the SCU.
1395 config PL310_ERRATA_769419
1396 bool "PL310 errata: no automatic Store Buffer drain"
1397 depends on CACHE_L2X0
1399 On revisions of the PL310 prior to r3p2, the Store Buffer does
1400 not automatically drain. This can cause normal, non-cacheable
1401 writes to be retained when the memory system is idle, leading
1402 to suboptimal I/O performance for drivers using coherent DMA.
1403 This option adds a write barrier to the cpu_idle loop so that,
1404 on systems with an outer cache, the store buffer is drained
1407 config ARM_ERRATA_775420
1408 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1411 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1412 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1413 operation aborts with MMU exception, it might cause the processor
1414 to deadlock. This workaround puts DSB before executing ISB if
1415 an abort may occur on cache maintenance.
1419 source "arch/arm/common/Kconfig"
1429 Find out whether you have ISA slots on your motherboard. ISA is the
1430 name of a bus system, i.e. the way the CPU talks to the other stuff
1431 inside your box. Other bus systems are PCI, EISA, MicroChannel
1432 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1433 newer boards don't support it. If you have ISA, say Y, otherwise N.
1435 # Select ISA DMA controller support
1440 # Select ISA DMA interface
1445 bool "PCI support" if MIGHT_HAVE_PCI
1447 Find out whether you have a PCI motherboard. PCI is the name of a
1448 bus system, i.e. the way the CPU talks to the other stuff inside
1449 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1450 VESA. If you have PCI, say Y, otherwise N.
1456 config PCI_NANOENGINE
1457 bool "BSE nanoEngine PCI support"
1458 depends on SA1100_NANOENGINE
1460 Enable PCI on the BSE nanoEngine board.
1465 # Select the host bridge type
1466 config PCI_HOST_VIA82C505
1468 depends on PCI && ARCH_SHARK
1471 config PCI_HOST_ITE8152
1473 depends on PCI && MACH_ARMCORE
1477 source "drivers/pci/Kconfig"
1479 source "drivers/pcmcia/Kconfig"
1483 menu "Kernel Features"
1488 This option should be selected by machines which have an SMP-
1491 The only effect of this option is to make the SMP-related
1492 options available to the user for configuration.
1495 bool "Symmetric Multi-Processing"
1496 depends on CPU_V6K || CPU_V7
1497 depends on GENERIC_CLOCKEVENTS
1500 select USE_GENERIC_SMP_HELPERS
1501 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1503 This enables support for systems with more than one CPU. If you have
1504 a system with only one CPU, like most personal computers, say N. If
1505 you have a system with more than one CPU, say Y.
1507 If you say N here, the kernel will run on single and multiprocessor
1508 machines, but will use only one CPU of a multiprocessor machine. If
1509 you say Y here, the kernel will run on many, but not all, single
1510 processor machines. On a single processor machine, the kernel will
1511 run faster if you say N here.
1513 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1514 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1515 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1517 If you don't know what to do here, say N.
1520 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1521 depends on EXPERIMENTAL
1522 depends on SMP && !XIP_KERNEL
1525 SMP kernels contain instructions which fail on non-SMP processors.
1526 Enabling this option allows the kernel to modify itself to make
1527 these instructions safe. Disabling it allows about 1K of space
1530 If you don't know what to do here, say Y.
1532 config ARM_CPU_TOPOLOGY
1533 bool "Support cpu topology definition"
1534 depends on SMP && CPU_V7
1537 Support ARM cpu topology definition. The MPIDR register defines
1538 affinity between processors which is then used to describe the cpu
1539 topology of an ARM System.
1542 bool "Multi-core scheduler support"
1543 depends on ARM_CPU_TOPOLOGY
1545 Multi-core scheduler support improves the CPU scheduler's decision
1546 making when dealing with multi-core CPU chips at a cost of slightly
1547 increased overhead in some places. If unsure say N here.
1550 bool "SMT scheduler support"
1551 depends on ARM_CPU_TOPOLOGY
1553 Improves the CPU scheduler's decision making when dealing with
1554 MultiThreading at a cost of slightly increased overhead in some
1555 places. If unsure say N here.
1560 This option enables support for the ARM system coherency unit
1562 config ARM_ARCH_TIMER
1563 bool "Architected timer support"
1566 This option enables support for the ARM architected timer
1572 This options enables support for the ARM timer and watchdog unit
1575 prompt "Memory split"
1578 Select the desired split between kernel and user memory.
1580 If you are not absolutely sure what you are doing, leave this
1584 bool "3G/1G user/kernel split"
1586 bool "2G/2G user/kernel split"
1588 bool "1G/3G user/kernel split"
1593 default 0x40000000 if VMSPLIT_1G
1594 default 0x80000000 if VMSPLIT_2G
1598 int "Maximum number of CPUs (2-32)"
1604 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1605 depends on SMP && HOTPLUG && EXPERIMENTAL
1607 Say Y here to experiment with turning CPUs off and on. CPUs
1608 can be controlled through /sys/devices/system/cpu.
1611 bool "Use local timer interrupts"
1614 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1616 Enable support for local timers on SMP platforms, rather then the
1617 legacy IPI broadcast method. Local timers allows the system
1618 accounting to be spread across the timer interval, preventing a
1619 "thundering herd" at every timer tick.
1623 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1624 default 355 if ARCH_U8500
1625 default 264 if MACH_H4700
1626 default 512 if SOC_OMAP5
1627 default 288 if ARCH_VT8500
1630 Maximum number of GPIOs in the system.
1632 If unsure, leave the default value.
1634 source kernel/Kconfig.preempt
1638 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1639 ARCH_S5PV210 || ARCH_EXYNOS4
1640 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1641 default AT91_TIMER_HZ if ARCH_AT91
1642 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1645 config THUMB2_KERNEL
1646 bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
1647 depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
1649 select ARM_ASM_UNIFIED
1652 By enabling this option, the kernel will be compiled in
1653 Thumb-2 mode. A compiler/assembler that understand the unified
1654 ARM-Thumb syntax is needed.
1658 config THUMB2_AVOID_R_ARM_THM_JUMP11
1659 bool "Work around buggy Thumb-2 short branch relocations in gas"
1660 depends on THUMB2_KERNEL && MODULES
1663 Various binutils versions can resolve Thumb-2 branches to
1664 locally-defined, preemptible global symbols as short-range "b.n"
1665 branch instructions.
1667 This is a problem, because there's no guarantee the final
1668 destination of the symbol, or any candidate locations for a
1669 trampoline, are within range of the branch. For this reason, the
1670 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1671 relocation in modules at all, and it makes little sense to add
1674 The symptom is that the kernel fails with an "unsupported
1675 relocation" error when loading some modules.
1677 Until fixed tools are available, passing
1678 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1679 code which hits this problem, at the cost of a bit of extra runtime
1680 stack usage in some cases.
1682 The problem is described in more detail at:
1683 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1685 Only Thumb-2 kernels are affected.
1687 Unless you are sure your tools don't have this problem, say Y.
1689 config ARM_ASM_UNIFIED
1693 bool "Use the ARM EABI to compile the kernel"
1695 This option allows for the kernel to be compiled using the latest
1696 ARM ABI (aka EABI). This is only useful if you are using a user
1697 space environment that is also compiled with EABI.
1699 Since there are major incompatibilities between the legacy ABI and
1700 EABI, especially with regard to structure member alignment, this
1701 option also changes the kernel syscall calling convention to
1702 disambiguate both ABIs and allow for backward compatibility support
1703 (selected with CONFIG_OABI_COMPAT).
1705 To use this you need GCC version 4.0.0 or later.
1708 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1709 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1712 This option preserves the old syscall interface along with the
1713 new (ARM EABI) one. It also provides a compatibility layer to
1714 intercept syscalls that have structure arguments which layout
1715 in memory differs between the legacy ABI and the new ARM EABI
1716 (only for non "thumb" binaries). This option adds a tiny
1717 overhead to all syscalls and produces a slightly larger kernel.
1718 If you know you'll be using only pure EABI user space then you
1719 can say N here. If this option is not selected and you attempt
1720 to execute a legacy ABI binary then the result will be
1721 UNPREDICTABLE (in fact it can be predicted that it won't work
1722 at all). If in doubt say Y.
1724 config ARCH_HAS_HOLES_MEMORYMODEL
1727 config ARCH_SPARSEMEM_ENABLE
1730 config ARCH_SPARSEMEM_DEFAULT
1731 def_bool ARCH_SPARSEMEM_ENABLE
1733 config ARCH_SELECT_MEMORY_MODEL
1734 def_bool ARCH_SPARSEMEM_ENABLE
1736 config HAVE_ARCH_PFN_VALID
1737 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1740 bool "High Memory Support"
1743 The address space of ARM processors is only 4 Gigabytes large
1744 and it has to accommodate user address space, kernel address
1745 space as well as some memory mapped IO. That means that, if you
1746 have a large amount of physical memory and/or IO, not all of the
1747 memory can be "permanently mapped" by the kernel. The physical
1748 memory that is not permanently mapped is called "high memory".
1750 Depending on the selected kernel/user memory split, minimum
1751 vmalloc space and actual amount of RAM, you may not need this
1752 option which should result in a slightly faster kernel.
1757 bool "Allocate 2nd-level pagetables from highmem"
1760 config HW_PERF_EVENTS
1761 bool "Enable hardware performance counter support for perf events"
1762 depends on PERF_EVENTS
1765 Enable hardware performance counter support for perf events. If
1766 disabled, perf events will use software events only.
1770 config FORCE_MAX_ZONEORDER
1771 int "Maximum zone order" if ARCH_SHMOBILE
1772 range 11 64 if ARCH_SHMOBILE
1773 default "9" if SA1111
1776 The kernel memory allocator divides physically contiguous memory
1777 blocks into "zones", where each zone is a power of two number of
1778 pages. This option selects the largest power of two that the kernel
1779 keeps in the memory allocator. If you need to allocate very large
1780 blocks of physically contiguous memory, then you may need to
1781 increase this value.
1783 This config option is actually maximum order plus one. For example,
1784 a value of 11 means that the largest free memory block is 2^10 pages.
1786 config ALIGNMENT_TRAP
1788 depends on CPU_CP15_MMU
1789 default y if !ARCH_EBSA110
1790 select HAVE_PROC_CPU if PROC_FS
1792 ARM processors cannot fetch/store information which is not
1793 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1794 address divisible by 4. On 32-bit ARM processors, these non-aligned
1795 fetch/store instructions will be emulated in software if you say
1796 here, which has a severe performance impact. This is necessary for
1797 correct operation of some network protocols. With an IP-only
1798 configuration it is safe to say N, otherwise say Y.
1800 config UACCESS_WITH_MEMCPY
1801 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1803 default y if CPU_FEROCEON
1805 Implement faster copy_to_user and clear_user methods for CPU
1806 cores where a 8-word STM instruction give significantly higher
1807 memory write throughput than a sequence of individual 32bit stores.
1809 A possible side effect is a slight increase in scheduling latency
1810 between threads sharing the same address space if they invoke
1811 such copy operations with large buffers.
1813 However, if the CPU data cache is using a write-allocate mode,
1814 this option is unlikely to provide any performance gain.
1818 prompt "Enable seccomp to safely compute untrusted bytecode"
1820 This kernel feature is useful for number crunching applications
1821 that may need to compute untrusted bytecode during their
1822 execution. By using pipes or other transports made available to
1823 the process as file descriptors supporting the read/write
1824 syscalls, it's possible to isolate those applications in
1825 their own address space using seccomp. Once seccomp is
1826 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1827 and the task is only allowed to execute a few safe syscalls
1828 defined by each seccomp mode.
1830 config CC_STACKPROTECTOR
1831 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1832 depends on EXPERIMENTAL
1834 This option turns on the -fstack-protector GCC feature. This
1835 feature puts, at the beginning of functions, a canary value on
1836 the stack just before the return address, and validates
1837 the value just before actually returning. Stack based buffer
1838 overflows (that need to overwrite this return address) now also
1839 overwrite the canary, which gets detected and the attack is then
1840 neutralized via a kernel panic.
1841 This feature requires gcc version 4.2 or above.
1848 bool "Xen guest support on ARM (EXPERIMENTAL)"
1849 depends on EXPERIMENTAL && ARM && OF
1851 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1858 bool "Flattened Device Tree support"
1860 select OF_EARLY_FLATTREE
1863 Include support for flattened device tree machine descriptions.
1866 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1869 This is the traditional way of passing data to the kernel at boot
1870 time. If you are solely relying on the flattened device tree (or
1871 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1872 to remove ATAGS support from your kernel binary. If unsure,
1875 config DEPRECATED_PARAM_STRUCT
1876 bool "Provide old way to pass kernel parameters"
1879 This was deprecated in 2001 and announced to live on for 5 years.
1880 Some old boot loaders still use this way.
1882 # Compressed boot loader in ROM. Yes, we really want to ask about
1883 # TEXT and BSS so we preserve their values in the config files.
1884 config ZBOOT_ROM_TEXT
1885 hex "Compressed ROM boot loader base address"
1888 The physical address at which the ROM-able zImage is to be
1889 placed in the target. Platforms which normally make use of
1890 ROM-able zImage formats normally set this to a suitable
1891 value in their defconfig file.
1893 If ZBOOT_ROM is not enabled, this has no effect.
1895 config ZBOOT_ROM_BSS
1896 hex "Compressed ROM boot loader BSS address"
1899 The base address of an area of read/write memory in the target
1900 for the ROM-able zImage which must be available while the
1901 decompressor is running. It must be large enough to hold the
1902 entire decompressed kernel plus an additional 128 KiB.
1903 Platforms which normally make use of ROM-able zImage formats
1904 normally set this to a suitable value in their defconfig file.
1906 If ZBOOT_ROM is not enabled, this has no effect.
1909 bool "Compressed boot loader in ROM/flash"
1910 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1912 Say Y here if you intend to execute your compressed kernel image
1913 (zImage) directly from ROM or flash. If unsure, say N.
1916 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1917 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1918 default ZBOOT_ROM_NONE
1920 Include experimental SD/MMC loading code in the ROM-able zImage.
1921 With this enabled it is possible to write the ROM-able zImage
1922 kernel image to an MMC or SD card and boot the kernel straight
1923 from the reset vector. At reset the processor Mask ROM will load
1924 the first part of the ROM-able zImage which in turn loads the
1925 rest the kernel image to RAM.
1927 config ZBOOT_ROM_NONE
1928 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1930 Do not load image from SD or MMC
1932 config ZBOOT_ROM_MMCIF
1933 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1935 Load image from MMCIF hardware block.
1937 config ZBOOT_ROM_SH_MOBILE_SDHI
1938 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1940 Load image from SDHI hardware block
1944 config ARM_APPENDED_DTB
1945 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1946 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1948 With this option, the boot code will look for a device tree binary
1949 (DTB) appended to zImage
1950 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1952 This is meant as a backward compatibility convenience for those
1953 systems with a bootloader that can't be upgraded to accommodate
1954 the documented boot protocol using a device tree.
1956 Beware that there is very little in terms of protection against
1957 this option being confused by leftover garbage in memory that might
1958 look like a DTB header after a reboot if no actual DTB is appended
1959 to zImage. Do not leave this option active in a production kernel
1960 if you don't intend to always append a DTB. Proper passing of the
1961 location into r2 of a bootloader provided DTB is always preferable
1964 config ARM_ATAG_DTB_COMPAT
1965 bool "Supplement the appended DTB with traditional ATAG information"
1966 depends on ARM_APPENDED_DTB
1968 Some old bootloaders can't be updated to a DTB capable one, yet
1969 they provide ATAGs with memory configuration, the ramdisk address,
1970 the kernel cmdline string, etc. Such information is dynamically
1971 provided by the bootloader and can't always be stored in a static
1972 DTB. To allow a device tree enabled kernel to be used with such
1973 bootloaders, this option allows zImage to extract the information
1974 from the ATAG list and store it at run time into the appended DTB.
1977 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1978 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1980 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1981 bool "Use bootloader kernel arguments if available"
1983 Uses the command-line options passed by the boot loader instead of
1984 the device tree bootargs property. If the boot loader doesn't provide
1985 any, the device tree bootargs property will be used.
1987 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1988 bool "Extend with bootloader kernel arguments"
1990 The command-line arguments provided by the boot loader will be
1991 appended to the the device tree bootargs property.
1996 string "Default kernel command string"
1999 On some architectures (EBSA110 and CATS), there is currently no way
2000 for the boot loader to pass arguments to the kernel. For these
2001 architectures, you should supply some command-line options at build
2002 time by entering them here. As a minimum, you should specify the
2003 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2006 prompt "Kernel command line type" if CMDLINE != ""
2007 default CMDLINE_FROM_BOOTLOADER
2010 config CMDLINE_FROM_BOOTLOADER
2011 bool "Use bootloader kernel arguments if available"
2013 Uses the command-line options passed by the boot loader. If
2014 the boot loader doesn't provide any, the default kernel command
2015 string provided in CMDLINE will be used.
2017 config CMDLINE_EXTEND
2018 bool "Extend bootloader kernel arguments"
2020 The command-line arguments provided by the boot loader will be
2021 appended to the default kernel command string.
2023 config CMDLINE_FORCE
2024 bool "Always use the default kernel command string"
2026 Always use the default kernel command string, even if the boot
2027 loader passes other arguments to the kernel.
2028 This is useful if you cannot or don't want to change the
2029 command-line options your boot loader passes to the kernel.
2033 bool "Kernel Execute-In-Place from ROM"
2034 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2036 Execute-In-Place allows the kernel to run from non-volatile storage
2037 directly addressable by the CPU, such as NOR flash. This saves RAM
2038 space since the text section of the kernel is not loaded from flash
2039 to RAM. Read-write sections, such as the data section and stack,
2040 are still copied to RAM. The XIP kernel is not compressed since
2041 it has to run directly from flash, so it will take more space to
2042 store it. The flash address used to link the kernel object files,
2043 and for storing it, is configuration dependent. Therefore, if you
2044 say Y here, you must know the proper physical address where to
2045 store the kernel image depending on your own flash memory usage.
2047 Also note that the make target becomes "make xipImage" rather than
2048 "make zImage" or "make Image". The final kernel binary to put in
2049 ROM memory will be arch/arm/boot/xipImage.
2053 config XIP_PHYS_ADDR
2054 hex "XIP Kernel Physical Location"
2055 depends on XIP_KERNEL
2056 default "0x00080000"
2058 This is the physical address in your flash memory the kernel will
2059 be linked for and stored to. This address is dependent on your
2063 bool "Kexec system call (EXPERIMENTAL)"
2064 depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
2066 kexec is a system call that implements the ability to shutdown your
2067 current kernel, and to start another kernel. It is like a reboot
2068 but it is independent of the system firmware. And like a reboot
2069 you can start any kernel with it, not just Linux.
2071 It is an ongoing process to be certain the hardware in a machine
2072 is properly shutdown, so do not be surprised if this code does not
2073 initially work for you. It may help to enable device hotplugging
2077 bool "Export atags in procfs"
2078 depends on ATAGS && KEXEC
2081 Should the atags used to boot the kernel be exported in an "atags"
2082 file in procfs. Useful with kexec.
2085 bool "Build kdump crash kernel (EXPERIMENTAL)"
2086 depends on EXPERIMENTAL
2088 Generate crash dump after being started by kexec. This should
2089 be normally only set in special crash dump kernels which are
2090 loaded in the main kernel with kexec-tools into a specially
2091 reserved region and then later executed after a crash by
2092 kdump/kexec. The crash dump kernel must be compiled to a
2093 memory address not used by the main kernel
2095 For more details see Documentation/kdump/kdump.txt
2097 config AUTO_ZRELADDR
2098 bool "Auto calculation of the decompressed kernel image address"
2099 depends on !ZBOOT_ROM && !ARCH_U300
2101 ZRELADDR is the physical address where the decompressed kernel
2102 image will be placed. If AUTO_ZRELADDR is selected, the address
2103 will be determined at run-time by masking the current IP with
2104 0xf8000000. This assumes the zImage being placed in the first 128MB
2105 from start of memory.
2109 menu "CPU Power Management"
2113 source "drivers/cpufreq/Kconfig"
2116 tristate "CPUfreq driver for i.MX CPUs"
2117 depends on ARCH_MXC && CPU_FREQ
2118 select CPU_FREQ_TABLE
2120 This enables the CPUfreq driver for i.MX CPUs.
2122 config CPU_FREQ_SA1100
2125 config CPU_FREQ_SA1110
2128 config CPU_FREQ_INTEGRATOR
2129 tristate "CPUfreq driver for ARM Integrator CPUs"
2130 depends on ARCH_INTEGRATOR && CPU_FREQ
2133 This enables the CPUfreq driver for ARM Integrator CPUs.
2135 For details, take a look at <file:Documentation/cpu-freq>.
2141 depends on CPU_FREQ && ARCH_PXA && PXA25x
2143 select CPU_FREQ_TABLE
2144 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2149 Internal configuration node for common cpufreq on Samsung SoC
2151 config CPU_FREQ_S3C24XX
2152 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2153 depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
2156 This enables the CPUfreq driver for the Samsung S3C24XX family
2159 For details, take a look at <file:Documentation/cpu-freq>.
2163 config CPU_FREQ_S3C24XX_PLL
2164 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2165 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2167 Compile in support for changing the PLL frequency from the
2168 S3C24XX series CPUfreq driver. The PLL takes time to settle
2169 after a frequency change, so by default it is not enabled.
2171 This also means that the PLL tables for the selected CPU(s) will
2172 be built which may increase the size of the kernel image.
2174 config CPU_FREQ_S3C24XX_DEBUG
2175 bool "Debug CPUfreq Samsung driver core"
2176 depends on CPU_FREQ_S3C24XX
2178 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2180 config CPU_FREQ_S3C24XX_IODEBUG
2181 bool "Debug CPUfreq Samsung driver IO timing"
2182 depends on CPU_FREQ_S3C24XX
2184 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2186 config CPU_FREQ_S3C24XX_DEBUGFS
2187 bool "Export debugfs for CPUFreq"
2188 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2190 Export status information via debugfs.
2194 source "drivers/cpuidle/Kconfig"
2198 menu "Floating point emulation"
2200 comment "At least one emulation must be selected"
2203 bool "NWFPE math emulation"
2204 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2206 Say Y to include the NWFPE floating point emulator in the kernel.
2207 This is necessary to run most binaries. Linux does not currently
2208 support floating point hardware so you need to say Y here even if
2209 your machine has an FPA or floating point co-processor podule.
2211 You may say N here if you are going to load the Acorn FPEmulator
2212 early in the bootup.
2215 bool "Support extended precision"
2216 depends on FPE_NWFPE
2218 Say Y to include 80-bit support in the kernel floating-point
2219 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2220 Note that gcc does not generate 80-bit operations by default,
2221 so in most cases this option only enlarges the size of the
2222 floating point emulator without any good reason.
2224 You almost surely want to say N here.
2227 bool "FastFPE math emulation (EXPERIMENTAL)"
2228 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2230 Say Y here to include the FAST floating point emulator in the kernel.
2231 This is an experimental much faster emulator which now also has full
2232 precision for the mantissa. It does not support any exceptions.
2233 It is very simple, and approximately 3-6 times faster than NWFPE.
2235 It should be sufficient for most programs. It may be not suitable
2236 for scientific calculations, but you have to check this for yourself.
2237 If you do not feel you need a faster FP emulation you should better
2241 bool "VFP-format floating point maths"
2242 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2244 Say Y to include VFP support code in the kernel. This is needed
2245 if your hardware includes a VFP unit.
2247 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2248 release notes and additional status information.
2250 Say N if your target does not have VFP hardware.
2258 bool "Advanced SIMD (NEON) Extension support"
2259 depends on VFPv3 && CPU_V7
2261 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2266 menu "Userspace binary formats"
2268 source "fs/Kconfig.binfmt"
2271 tristate "RISC OS personality"
2274 Say Y here to include the kernel code necessary if you want to run
2275 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2276 experimental; if this sounds frightening, say N and sleep in peace.
2277 You can also say M here to compile this support as a module (which
2278 will be called arthur).
2282 menu "Power management options"
2284 source "kernel/power/Kconfig"
2286 config ARCH_SUSPEND_POSSIBLE
2287 depends on !ARCH_S5PC100
2288 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2289 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2292 config ARM_CPU_SUSPEND
2297 source "net/Kconfig"
2299 source "drivers/Kconfig"
2303 source "arch/arm/Kconfig.debug"
2305 source "security/Kconfig"
2307 source "crypto/Kconfig"
2309 source "lib/Kconfig"