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 (CPU_V6 || CPU_V6K || CPU_V7)
12 select SYS_SUPPORTS_APM_EMULATION
13 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
14 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
15 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
17 select HAVE_ARCH_TRACEHOOK
18 select HAVE_KPROBES if !XIP_KERNEL
19 select HAVE_KRETPROBES if (HAVE_KPROBES)
20 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
21 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
22 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
23 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
24 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
25 select HAVE_GENERIC_DMA_COHERENT
26 select HAVE_KERNEL_GZIP
27 select HAVE_KERNEL_LZO
28 select HAVE_KERNEL_LZMA
31 select HAVE_PERF_EVENTS
32 select PERF_USE_VMALLOC
33 select HAVE_REGS_AND_STACK_ACCESS_API
34 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
35 select HAVE_C_RECORDMCOUNT
36 select HAVE_GENERIC_HARDIRQS
37 select HARDIRQS_SW_RESEND
38 select GENERIC_IRQ_PROBE
39 select GENERIC_IRQ_SHOW
40 select GENERIC_IRQ_PROBE
41 select HARDIRQS_SW_RESEND
42 select CPU_PM if (SUSPEND || CPU_IDLE)
43 select GENERIC_PCI_IOMAP
45 select GENERIC_SMP_IDLE_THREAD
47 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
48 select GENERIC_STRNCPY_FROM_USER
49 select GENERIC_STRNLEN_USER
50 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN
52 The ARM series is a line of low-power-consumption RISC chip designs
53 licensed by ARM Ltd and targeted at embedded applications and
54 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
55 manufactured, but legacy ARM-based PC hardware remains popular in
56 Europe. There is an ARM Linux project with a web page at
57 <http://www.arm.linux.org.uk/>.
59 config ARM_HAS_SG_CHAIN
62 config NEED_SG_DMA_LENGTH
65 config ARM_DMA_USE_IOMMU
66 select NEED_SG_DMA_LENGTH
67 select ARM_HAS_SG_CHAIN
76 config SYS_SUPPORTS_APM_EMULATION
84 select GENERIC_ALLOCATOR
95 The Extended Industry Standard Architecture (EISA) bus was
96 developed as an open alternative to the IBM MicroChannel bus.
98 The EISA bus provided some of the features of the IBM MicroChannel
99 bus while maintaining backward compatibility with cards made for
100 the older ISA bus. The EISA bus saw limited use between 1988 and
101 1995 when it was made obsolete by the PCI bus.
103 Say Y here if you are building a kernel for an EISA-based machine.
110 config STACKTRACE_SUPPORT
114 config HAVE_LATENCYTOP_SUPPORT
119 config LOCKDEP_SUPPORT
123 config TRACE_IRQFLAGS_SUPPORT
127 config GENERIC_LOCKBREAK
130 depends on SMP && PREEMPT
132 config RWSEM_GENERIC_SPINLOCK
136 config RWSEM_XCHGADD_ALGORITHM
139 config ARCH_HAS_ILOG2_U32
142 config ARCH_HAS_ILOG2_U64
145 config ARCH_HAS_CPUFREQ
148 Internal node to signify that the ARCH has CPUFREQ support
149 and that the relevant menu configurations are displayed for
152 config GENERIC_HWEIGHT
156 config GENERIC_CALIBRATE_DELAY
160 config ARCH_MAY_HAVE_PC_FDC
166 config NEED_DMA_MAP_STATE
169 config ARCH_HAS_DMA_SET_COHERENT_MASK
172 config GENERIC_ISA_DMA
178 config NEED_RET_TO_USER
186 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
187 default DRAM_BASE if REMAP_VECTORS_TO_RAM
190 The base address of exception vectors.
192 config ARM_PATCH_PHYS_VIRT
193 bool "Patch physical to virtual translations at runtime" if EMBEDDED
195 depends on !XIP_KERNEL && MMU
196 depends on !ARCH_REALVIEW || !SPARSEMEM
198 Patch phys-to-virt and virt-to-phys translation functions at
199 boot and module load time according to the position of the
200 kernel in system memory.
202 This can only be used with non-XIP MMU kernels where the base
203 of physical memory is at a 16MB boundary.
205 Only disable this option if you know that you do not require
206 this feature (eg, building a kernel for a single machine) and
207 you need to shrink the kernel to the minimal size.
209 config NEED_MACH_IO_H
212 Select this when mach/io.h is required to provide special
213 definitions for this platform. The need for mach/io.h should
214 be avoided when possible.
216 config NEED_MACH_MEMORY_H
219 Select this when mach/memory.h is required to provide special
220 definitions for this platform. The need for mach/memory.h should
221 be avoided when possible.
224 hex "Physical address of main memory" if MMU
225 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
226 default DRAM_BASE if !MMU
228 Please provide the physical address corresponding to the
229 location of main memory in your system.
235 source "init/Kconfig"
237 source "kernel/Kconfig.freezer"
242 bool "MMU-based Paged Memory Management Support"
245 Select if you want MMU-based virtualised addressing space
246 support by paged memory management. If unsure, say 'Y'.
249 # The "ARM system type" choice list is ordered alphabetically by option
250 # text. Please add new entries in the option alphabetic order.
253 prompt "ARM system type"
254 default ARCH_VERSATILE
257 bool "Altera SOCFPGA family"
258 select ARCH_WANT_OPTIONAL_GPIOLIB
266 select DW_APB_TIMER_OF
267 select GENERIC_CLOCKEVENTS
268 select GPIO_PL061 if GPIOLIB
273 This enables support for Altera SOCFPGA Cyclone V platform
275 config ARCH_INTEGRATOR
276 bool "ARM Ltd. Integrator family"
278 select ARCH_HAS_CPUFREQ
283 select GENERIC_CLOCKEVENTS
284 select PLAT_VERSATILE
285 select PLAT_VERSATILE_FPGA_IRQ
286 select NEED_MACH_IO_H
287 select NEED_MACH_MEMORY_H
289 select MULTI_IRQ_HANDLER
291 Support for ARM's Integrator platform.
294 bool "ARM Ltd. RealView family"
297 select HAVE_MACH_CLKDEV
299 select GENERIC_CLOCKEVENTS
300 select ARCH_WANT_OPTIONAL_GPIOLIB
301 select PLAT_VERSATILE
302 select PLAT_VERSATILE_CLOCK
303 select PLAT_VERSATILE_CLCD
304 select ARM_TIMER_SP804
305 select GPIO_PL061 if GPIOLIB
306 select NEED_MACH_MEMORY_H
308 This enables support for ARM Ltd RealView boards.
310 config ARCH_VERSATILE
311 bool "ARM Ltd. Versatile family"
315 select HAVE_MACH_CLKDEV
317 select GENERIC_CLOCKEVENTS
318 select ARCH_WANT_OPTIONAL_GPIOLIB
319 select NEED_MACH_IO_H if PCI
320 select PLAT_VERSATILE
321 select PLAT_VERSATILE_CLOCK
322 select PLAT_VERSATILE_CLCD
323 select PLAT_VERSATILE_FPGA_IRQ
324 select ARM_TIMER_SP804
326 This enables support for ARM Ltd Versatile board.
329 bool "ARM Ltd. Versatile Express family"
330 select ARCH_WANT_OPTIONAL_GPIOLIB
332 select ARM_TIMER_SP804
335 select GENERIC_CLOCKEVENTS
337 select HAVE_PATA_PLATFORM
340 select PLAT_VERSATILE
341 select PLAT_VERSATILE_CLCD
342 select REGULATOR_FIXED_VOLTAGE if REGULATOR
344 This enables support for the ARM Ltd Versatile Express boards.
348 select ARCH_REQUIRE_GPIOLIB
352 select NEED_MACH_IO_H if PCCARD
354 This enables support for systems based on Atmel
355 AT91RM9200 and AT91SAM9* processors.
358 bool "Broadcom BCMRING"
362 select ARM_TIMER_SP804
364 select GENERIC_CLOCKEVENTS
365 select ARCH_WANT_OPTIONAL_GPIOLIB
367 Support for Broadcom's BCMRing platform.
370 bool "Calxeda Highbank-based"
371 select ARCH_WANT_OPTIONAL_GPIOLIB
374 select ARM_TIMER_SP804
379 select GENERIC_CLOCKEVENTS
385 Support for the Calxeda Highbank SoC based boards.
388 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
390 select ARCH_USES_GETTIMEOFFSET
391 select NEED_MACH_MEMORY_H
393 Support for Cirrus Logic 711x/721x/731x based boards.
396 bool "Cavium Networks CNS3XXX family"
398 select GENERIC_CLOCKEVENTS
400 select MIGHT_HAVE_CACHE_L2X0
401 select MIGHT_HAVE_PCI
402 select PCI_DOMAINS if PCI
404 Support for Cavium Networks CNS3XXX platform.
407 bool "Cortina Systems Gemini"
409 select ARCH_REQUIRE_GPIOLIB
410 select ARCH_USES_GETTIMEOFFSET
412 Support for the Cortina Systems Gemini family SoCs
415 bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
418 select ARCH_REQUIRE_GPIOLIB
419 select GENERIC_CLOCKEVENTS
421 select GENERIC_IRQ_CHIP
422 select MIGHT_HAVE_CACHE_L2X0
428 Support for CSR SiRFSoC ARM Cortex A9 Platform
435 select ARCH_USES_GETTIMEOFFSET
436 select NEED_MACH_IO_H
437 select NEED_MACH_MEMORY_H
439 This is an evaluation board for the StrongARM processor available
440 from Digital. It has limited hardware on-board, including an
441 Ethernet interface, two PCMCIA sockets, two serial ports and a
450 select ARCH_REQUIRE_GPIOLIB
451 select ARCH_HAS_HOLES_MEMORYMODEL
452 select ARCH_USES_GETTIMEOFFSET
453 select NEED_MACH_MEMORY_H
455 This enables support for the Cirrus EP93xx series of CPUs.
457 config ARCH_FOOTBRIDGE
461 select GENERIC_CLOCKEVENTS
463 select NEED_MACH_IO_H
464 select NEED_MACH_MEMORY_H
466 Support for systems based on the DC21285 companion chip
467 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
470 bool "Freescale MXC/iMX-based"
471 select GENERIC_CLOCKEVENTS
472 select ARCH_REQUIRE_GPIOLIB
475 select GENERIC_IRQ_CHIP
476 select MULTI_IRQ_HANDLER
480 Support for Freescale MXC/iMX-based family of processors
483 bool "Freescale MXS-based"
484 select GENERIC_CLOCKEVENTS
485 select ARCH_REQUIRE_GPIOLIB
489 select HAVE_CLK_PREPARE
493 Support for Freescale MXS-based family of processors
496 bool "Hilscher NetX based"
500 select GENERIC_CLOCKEVENTS
502 This enables support for systems based on the Hilscher NetX Soc
505 bool "Hynix HMS720x-based"
508 select ARCH_USES_GETTIMEOFFSET
510 This enables support for systems based on the Hynix HMS720x
518 select ARCH_SUPPORTS_MSI
520 select NEED_MACH_IO_H
521 select NEED_MACH_MEMORY_H
522 select NEED_RET_TO_USER
524 Support for Intel's IOP13XX (XScale) family of processors.
530 select NEED_MACH_IO_H
531 select NEED_RET_TO_USER
534 select ARCH_REQUIRE_GPIOLIB
536 Support for Intel's 80219 and IOP32X (XScale) family of
543 select NEED_MACH_IO_H
544 select NEED_RET_TO_USER
547 select ARCH_REQUIRE_GPIOLIB
549 Support for Intel's IOP33X (XScale) family of processors.
554 select ARCH_HAS_DMA_SET_COHERENT_MASK
557 select ARCH_REQUIRE_GPIOLIB
558 select GENERIC_CLOCKEVENTS
559 select MIGHT_HAVE_PCI
560 select NEED_MACH_IO_H
561 select DMABOUNCE if PCI
563 Support for Intel's IXP4XX (XScale) family of processors.
566 bool "Marvell SOCs with Device Tree support"
567 select GENERIC_CLOCKEVENTS
568 select MULTI_IRQ_HANDLER
571 select GENERIC_IRQ_CHIP
575 Support for the Marvell SoC Family with device tree support
581 select ARCH_REQUIRE_GPIOLIB
582 select GENERIC_CLOCKEVENTS
583 select NEED_MACH_IO_H
586 Support for the Marvell Dove SoC 88AP510
589 bool "Marvell Kirkwood"
592 select ARCH_REQUIRE_GPIOLIB
593 select GENERIC_CLOCKEVENTS
594 select NEED_MACH_IO_H
597 Support for the following Marvell Kirkwood series SoCs:
598 88F6180, 88F6192 and 88F6281.
604 select ARCH_REQUIRE_GPIOLIB
607 select USB_ARCH_HAS_OHCI
609 select GENERIC_CLOCKEVENTS
613 Support for the NXP LPC32XX family of processors
616 bool "Marvell MV78xx0"
619 select ARCH_REQUIRE_GPIOLIB
620 select GENERIC_CLOCKEVENTS
621 select NEED_MACH_IO_H
624 Support for the following Marvell MV78xx0 series SoCs:
632 select ARCH_REQUIRE_GPIOLIB
633 select GENERIC_CLOCKEVENTS
634 select NEED_MACH_IO_H
637 Support for the following Marvell Orion 5x series SoCs:
638 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
639 Orion-2 (5281), Orion-1-90 (6183).
642 bool "Marvell PXA168/910/MMP2"
644 select ARCH_REQUIRE_GPIOLIB
646 select GENERIC_CLOCKEVENTS
651 select GENERIC_ALLOCATOR
653 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
656 bool "Micrel/Kendin KS8695"
658 select ARCH_REQUIRE_GPIOLIB
659 select ARCH_USES_GETTIMEOFFSET
660 select NEED_MACH_MEMORY_H
662 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
663 System-on-Chip devices.
666 bool "Nuvoton W90X900 CPU"
668 select ARCH_REQUIRE_GPIOLIB
671 select GENERIC_CLOCKEVENTS
673 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
674 At present, the w90x900 has been renamed nuc900, regarding
675 the ARM series product line, you can login the following
676 link address to know more.
678 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
679 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
685 select GENERIC_CLOCKEVENTS
689 select MIGHT_HAVE_CACHE_L2X0
690 select NEED_MACH_IO_H if PCI
691 select ARCH_HAS_CPUFREQ
694 This enables support for NVIDIA Tegra based systems (Tegra APX,
695 Tegra 6xx and Tegra 2 series).
697 config ARCH_PICOXCELL
698 bool "Picochip picoXcell"
699 select ARCH_REQUIRE_GPIOLIB
700 select ARM_PATCH_PHYS_VIRT
704 select DW_APB_TIMER_OF
705 select GENERIC_CLOCKEVENTS
712 This enables support for systems based on the Picochip picoXcell
713 family of Femtocell devices. The picoxcell support requires device tree
717 bool "Philips Nexperia PNX4008 Mobile"
720 select ARCH_USES_GETTIMEOFFSET
722 This enables support for Philips PNX4008 mobile platform.
725 bool "PXA2xx/PXA3xx-based"
728 select ARCH_HAS_CPUFREQ
731 select ARCH_REQUIRE_GPIOLIB
732 select GENERIC_CLOCKEVENTS
737 select MULTI_IRQ_HANDLER
738 select ARM_CPU_SUSPEND if PM
741 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
746 select GENERIC_CLOCKEVENTS
747 select ARCH_REQUIRE_GPIOLIB
750 Support for Qualcomm MSM/QSD based systems. This runs on the
751 apps processor of the MSM/QSD and depends on a shared memory
752 interface to the modem processor which runs the baseband
753 stack and controls some vital subsystems
754 (clock and power control, etc).
757 bool "Renesas SH-Mobile / R-Mobile"
760 select HAVE_MACH_CLKDEV
762 select GENERIC_CLOCKEVENTS
763 select MIGHT_HAVE_CACHE_L2X0
766 select MULTI_IRQ_HANDLER
767 select PM_GENERIC_DOMAINS if PM
768 select NEED_MACH_MEMORY_H
770 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
776 select ARCH_MAY_HAVE_PC_FDC
777 select HAVE_PATA_PLATFORM
780 select ARCH_SPARSEMEM_ENABLE
781 select ARCH_USES_GETTIMEOFFSET
783 select NEED_MACH_IO_H
784 select NEED_MACH_MEMORY_H
786 On the Acorn Risc-PC, Linux can support the internal IDE disk and
787 CD-ROM interface, serial and parallel port, and the floppy drive.
794 select ARCH_SPARSEMEM_ENABLE
796 select ARCH_HAS_CPUFREQ
798 select GENERIC_CLOCKEVENTS
800 select ARCH_REQUIRE_GPIOLIB
802 select NEED_MACH_MEMORY_H
805 Support for StrongARM 11x0 based boards.
808 bool "Samsung S3C24XX SoCs"
810 select ARCH_HAS_CPUFREQ
813 select ARCH_USES_GETTIMEOFFSET
814 select HAVE_S3C2410_I2C if I2C
815 select HAVE_S3C_RTC if RTC_CLASS
816 select HAVE_S3C2410_WATCHDOG if WATCHDOG
817 select NEED_MACH_IO_H
819 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
820 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
821 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
822 Samsung SMDK2410 development board (and derivatives).
825 bool "Samsung S3C64XX"
833 select ARCH_USES_GETTIMEOFFSET
834 select ARCH_HAS_CPUFREQ
835 select ARCH_REQUIRE_GPIOLIB
836 select SAMSUNG_CLKSRC
837 select SAMSUNG_IRQ_VIC_TIMER
838 select S3C_GPIO_TRACK
840 select USB_ARCH_HAS_OHCI
841 select SAMSUNG_GPIOLIB_4BIT
842 select HAVE_S3C2410_I2C if I2C
843 select HAVE_S3C2410_WATCHDOG if WATCHDOG
845 Samsung S3C64XX series based systems
848 bool "Samsung S5P6440 S5P6450"
854 select HAVE_S3C2410_WATCHDOG if WATCHDOG
855 select GENERIC_CLOCKEVENTS
856 select HAVE_S3C2410_I2C if I2C
857 select HAVE_S3C_RTC if RTC_CLASS
859 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
863 bool "Samsung S5PC100"
868 select ARCH_USES_GETTIMEOFFSET
869 select HAVE_S3C2410_I2C if I2C
870 select HAVE_S3C_RTC if RTC_CLASS
871 select HAVE_S3C2410_WATCHDOG if WATCHDOG
873 Samsung S5PC100 series based systems
876 bool "Samsung S5PV210/S5PC110"
878 select ARCH_SPARSEMEM_ENABLE
879 select ARCH_HAS_HOLES_MEMORYMODEL
884 select ARCH_HAS_CPUFREQ
885 select GENERIC_CLOCKEVENTS
886 select HAVE_S3C2410_I2C if I2C
887 select HAVE_S3C_RTC if RTC_CLASS
888 select HAVE_S3C2410_WATCHDOG if WATCHDOG
889 select NEED_MACH_MEMORY_H
891 Samsung S5PV210/S5PC110 series based systems
894 bool "SAMSUNG EXYNOS"
896 select ARCH_SPARSEMEM_ENABLE
897 select ARCH_HAS_HOLES_MEMORYMODEL
901 select ARCH_HAS_CPUFREQ
902 select GENERIC_CLOCKEVENTS
903 select HAVE_S3C_RTC if RTC_CLASS
904 select HAVE_S3C2410_I2C if I2C
905 select HAVE_S3C2410_WATCHDOG if WATCHDOG
906 select NEED_MACH_MEMORY_H
908 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
917 select ARCH_USES_GETTIMEOFFSET
918 select NEED_MACH_MEMORY_H
919 select NEED_MACH_IO_H
921 Support for the StrongARM based Digital DNARD machine, also known
922 as "Shark" (<http://www.shark-linux.de/shark.html>).
925 bool "ST-Ericsson U300 Series"
931 select ARM_PATCH_PHYS_VIRT
933 select GENERIC_CLOCKEVENTS
937 select ARCH_REQUIRE_GPIOLIB
939 Support for ST-Ericsson U300 series mobile platforms.
942 bool "ST-Ericsson U8500 Series"
946 select GENERIC_CLOCKEVENTS
948 select ARCH_REQUIRE_GPIOLIB
949 select ARCH_HAS_CPUFREQ
951 select MIGHT_HAVE_CACHE_L2X0
953 Support for ST-Ericsson's Ux500 architecture
956 bool "STMicroelectronics Nomadik"
961 select GENERIC_CLOCKEVENTS
963 select MIGHT_HAVE_CACHE_L2X0
964 select ARCH_REQUIRE_GPIOLIB
966 Support for the Nomadik platform by ST-Ericsson
970 select GENERIC_CLOCKEVENTS
971 select ARCH_REQUIRE_GPIOLIB
975 select GENERIC_ALLOCATOR
976 select GENERIC_IRQ_CHIP
977 select ARCH_HAS_HOLES_MEMORYMODEL
979 Support for TI's DaVinci platform.
985 select ARCH_REQUIRE_GPIOLIB
986 select ARCH_HAS_CPUFREQ
988 select GENERIC_CLOCKEVENTS
989 select ARCH_HAS_HOLES_MEMORYMODEL
991 Support for TI's OMAP platform (OMAP1/2/3/4).
996 select ARCH_REQUIRE_GPIOLIB
1000 select GENERIC_CLOCKEVENTS
1003 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
1006 bool "VIA/WonderMedia 85xx"
1009 select ARCH_HAS_CPUFREQ
1010 select GENERIC_CLOCKEVENTS
1011 select ARCH_REQUIRE_GPIOLIB
1014 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
1017 bool "Xilinx Zynq ARM Cortex A9 Platform"
1019 select GENERIC_CLOCKEVENTS
1020 select CLKDEV_LOOKUP
1024 select MIGHT_HAVE_CACHE_L2X0
1027 Support for Xilinx Zynq ARM Cortex A9 Platform
1031 # This is sorted alphabetically by mach-* pathname. However, plat-*
1032 # Kconfigs may be included either alphabetically (according to the
1033 # plat- suffix) or along side the corresponding mach-* source.
1035 source "arch/arm/mach-mvebu/Kconfig"
1037 source "arch/arm/mach-at91/Kconfig"
1039 source "arch/arm/mach-bcmring/Kconfig"
1041 source "arch/arm/mach-clps711x/Kconfig"
1043 source "arch/arm/mach-cns3xxx/Kconfig"
1045 source "arch/arm/mach-davinci/Kconfig"
1047 source "arch/arm/mach-dove/Kconfig"
1049 source "arch/arm/mach-ep93xx/Kconfig"
1051 source "arch/arm/mach-footbridge/Kconfig"
1053 source "arch/arm/mach-gemini/Kconfig"
1055 source "arch/arm/mach-h720x/Kconfig"
1057 source "arch/arm/mach-integrator/Kconfig"
1059 source "arch/arm/mach-iop32x/Kconfig"
1061 source "arch/arm/mach-iop33x/Kconfig"
1063 source "arch/arm/mach-iop13xx/Kconfig"
1065 source "arch/arm/mach-ixp4xx/Kconfig"
1067 source "arch/arm/mach-kirkwood/Kconfig"
1069 source "arch/arm/mach-ks8695/Kconfig"
1071 source "arch/arm/mach-msm/Kconfig"
1073 source "arch/arm/mach-mv78xx0/Kconfig"
1075 source "arch/arm/plat-mxc/Kconfig"
1077 source "arch/arm/mach-mxs/Kconfig"
1079 source "arch/arm/mach-netx/Kconfig"
1081 source "arch/arm/mach-nomadik/Kconfig"
1082 source "arch/arm/plat-nomadik/Kconfig"
1084 source "arch/arm/plat-omap/Kconfig"
1086 source "arch/arm/mach-omap1/Kconfig"
1088 source "arch/arm/mach-omap2/Kconfig"
1090 source "arch/arm/mach-orion5x/Kconfig"
1092 source "arch/arm/mach-pxa/Kconfig"
1093 source "arch/arm/plat-pxa/Kconfig"
1095 source "arch/arm/mach-mmp/Kconfig"
1097 source "arch/arm/mach-realview/Kconfig"
1099 source "arch/arm/mach-sa1100/Kconfig"
1101 source "arch/arm/plat-samsung/Kconfig"
1102 source "arch/arm/plat-s3c24xx/Kconfig"
1104 source "arch/arm/plat-spear/Kconfig"
1106 source "arch/arm/mach-s3c24xx/Kconfig"
1108 source "arch/arm/mach-s3c2412/Kconfig"
1109 source "arch/arm/mach-s3c2440/Kconfig"
1113 source "arch/arm/mach-s3c64xx/Kconfig"
1116 source "arch/arm/mach-s5p64x0/Kconfig"
1118 source "arch/arm/mach-s5pc100/Kconfig"
1120 source "arch/arm/mach-s5pv210/Kconfig"
1122 source "arch/arm/mach-exynos/Kconfig"
1124 source "arch/arm/mach-shmobile/Kconfig"
1126 source "arch/arm/mach-tegra/Kconfig"
1128 source "arch/arm/mach-u300/Kconfig"
1130 source "arch/arm/mach-ux500/Kconfig"
1132 source "arch/arm/mach-versatile/Kconfig"
1134 source "arch/arm/mach-vexpress/Kconfig"
1135 source "arch/arm/plat-versatile/Kconfig"
1137 source "arch/arm/mach-vt8500/Kconfig"
1139 source "arch/arm/mach-w90x900/Kconfig"
1141 # Definitions to make life easier
1147 select GENERIC_CLOCKEVENTS
1152 select GENERIC_IRQ_CHIP
1158 config PLAT_VERSATILE
1161 config ARM_TIMER_SP804
1164 select HAVE_SCHED_CLOCK
1166 source arch/arm/mm/Kconfig
1170 default 16 if ARCH_EP93XX
1174 bool "Enable iWMMXt support"
1175 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1176 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1178 Enable support for iWMMXt context switching at run time if
1179 running on a CPU that supports it.
1183 depends on CPU_XSCALE
1187 depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
1188 (!ARCH_OMAP3 || OMAP3_EMU)
1192 config MULTI_IRQ_HANDLER
1195 Allow each machine to specify it's own IRQ handler at run time.
1198 source "arch/arm/Kconfig-nommu"
1201 config ARM_ERRATA_326103
1202 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1205 Executing a SWP instruction to read-only memory does not set bit 11
1206 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1207 treat the access as a read, preventing a COW from occurring and
1208 causing the faulting task to livelock.
1210 config ARM_ERRATA_411920
1211 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1212 depends on CPU_V6 || CPU_V6K
1214 Invalidation of the Instruction Cache operation can
1215 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1216 It does not affect the MPCore. This option enables the ARM Ltd.
1217 recommended workaround.
1219 config ARM_ERRATA_430973
1220 bool "ARM errata: Stale prediction on replaced interworking branch"
1223 This option enables the workaround for the 430973 Cortex-A8
1224 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1225 interworking branch is replaced with another code sequence at the
1226 same virtual address, whether due to self-modifying code or virtual
1227 to physical address re-mapping, Cortex-A8 does not recover from the
1228 stale interworking branch prediction. This results in Cortex-A8
1229 executing the new code sequence in the incorrect ARM or Thumb state.
1230 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1231 and also flushes the branch target cache at every context switch.
1232 Note that setting specific bits in the ACTLR register may not be
1233 available in non-secure mode.
1235 config ARM_ERRATA_458693
1236 bool "ARM errata: Processor deadlock when a false hazard is created"
1239 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1240 erratum. For very specific sequences of memory operations, it is
1241 possible for a hazard condition intended for a cache line to instead
1242 be incorrectly associated with a different cache line. This false
1243 hazard might then cause a processor deadlock. The workaround enables
1244 the L1 caching of the NEON accesses and disables the PLD instruction
1245 in the ACTLR register. Note that setting specific bits in the ACTLR
1246 register may not be available in non-secure mode.
1248 config ARM_ERRATA_460075
1249 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1252 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1253 erratum. Any asynchronous access to the L2 cache may encounter a
1254 situation in which recent store transactions to the L2 cache are lost
1255 and overwritten with stale memory contents from external memory. The
1256 workaround disables the write-allocate mode for the L2 cache via the
1257 ACTLR register. Note that setting specific bits in the ACTLR register
1258 may not be available in non-secure mode.
1260 config ARM_ERRATA_742230
1261 bool "ARM errata: DMB operation may be faulty"
1262 depends on CPU_V7 && SMP
1264 This option enables the workaround for the 742230 Cortex-A9
1265 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1266 between two write operations may not ensure the correct visibility
1267 ordering of the two writes. This workaround sets a specific bit in
1268 the diagnostic register of the Cortex-A9 which causes the DMB
1269 instruction to behave as a DSB, ensuring the correct behaviour of
1272 config ARM_ERRATA_742231
1273 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1274 depends on CPU_V7 && SMP
1276 This option enables the workaround for the 742231 Cortex-A9
1277 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1278 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1279 accessing some data located in the same cache line, may get corrupted
1280 data due to bad handling of the address hazard when the line gets
1281 replaced from one of the CPUs at the same time as another CPU is
1282 accessing it. This workaround sets specific bits in the diagnostic
1283 register of the Cortex-A9 which reduces the linefill issuing
1284 capabilities of the processor.
1286 config PL310_ERRATA_588369
1287 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1288 depends on CACHE_L2X0
1290 The PL310 L2 cache controller implements three types of Clean &
1291 Invalidate maintenance operations: by Physical Address
1292 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1293 They are architecturally defined to behave as the execution of a
1294 clean operation followed immediately by an invalidate operation,
1295 both performing to the same memory location. This functionality
1296 is not correctly implemented in PL310 as clean lines are not
1297 invalidated as a result of these operations.
1299 config ARM_ERRATA_720789
1300 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1303 This option enables the workaround for the 720789 Cortex-A9 (prior to
1304 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1305 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1306 As a consequence of this erratum, some TLB entries which should be
1307 invalidated are not, resulting in an incoherency in the system page
1308 tables. The workaround changes the TLB flushing routines to invalidate
1309 entries regardless of the ASID.
1311 config PL310_ERRATA_727915
1312 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1313 depends on CACHE_L2X0
1315 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1316 operation (offset 0x7FC). This operation runs in background so that
1317 PL310 can handle normal accesses while it is in progress. Under very
1318 rare circumstances, due to this erratum, write data can be lost when
1319 PL310 treats a cacheable write transaction during a Clean &
1320 Invalidate by Way operation.
1322 config ARM_ERRATA_743622
1323 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1326 This option enables the workaround for the 743622 Cortex-A9
1327 (r2p*) erratum. Under very rare conditions, a faulty
1328 optimisation in the Cortex-A9 Store Buffer may lead to data
1329 corruption. This workaround sets a specific bit in the diagnostic
1330 register of the Cortex-A9 which disables the Store Buffer
1331 optimisation, preventing the defect from occurring. This has no
1332 visible impact on the overall performance or power consumption of the
1335 config ARM_ERRATA_751472
1336 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1339 This option enables the workaround for the 751472 Cortex-A9 (prior
1340 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1341 completion of a following broadcasted operation if the second
1342 operation is received by a CPU before the ICIALLUIS has completed,
1343 potentially leading to corrupted entries in the cache or TLB.
1345 config PL310_ERRATA_753970
1346 bool "PL310 errata: cache sync operation may be faulty"
1347 depends on CACHE_PL310
1349 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1351 Under some condition the effect of cache sync operation on
1352 the store buffer still remains when the operation completes.
1353 This means that the store buffer is always asked to drain and
1354 this prevents it from merging any further writes. The workaround
1355 is to replace the normal offset of cache sync operation (0x730)
1356 by another offset targeting an unmapped PL310 register 0x740.
1357 This has the same effect as the cache sync operation: store buffer
1358 drain and waiting for all buffers empty.
1360 config ARM_ERRATA_754322
1361 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1364 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1365 r3p*) erratum. A speculative memory access may cause a page table walk
1366 which starts prior to an ASID switch but completes afterwards. This
1367 can populate the micro-TLB with a stale entry which may be hit with
1368 the new ASID. This workaround places two dsb instructions in the mm
1369 switching code so that no page table walks can cross the ASID switch.
1371 config ARM_ERRATA_754327
1372 bool "ARM errata: no automatic Store Buffer drain"
1373 depends on CPU_V7 && SMP
1375 This option enables the workaround for the 754327 Cortex-A9 (prior to
1376 r2p0) erratum. The Store Buffer does not have any automatic draining
1377 mechanism and therefore a livelock may occur if an external agent
1378 continuously polls a memory location waiting to observe an update.
1379 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1380 written polling loops from denying visibility of updates to memory.
1382 config ARM_ERRATA_364296
1383 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1384 depends on CPU_V6 && !SMP
1386 This options enables the workaround for the 364296 ARM1136
1387 r0p2 erratum (possible cache data corruption with
1388 hit-under-miss enabled). It sets the undocumented bit 31 in
1389 the auxiliary control register and the FI bit in the control
1390 register, thus disabling hit-under-miss without putting the
1391 processor into full low interrupt latency mode. ARM11MPCore
1394 config ARM_ERRATA_764369
1395 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1396 depends on CPU_V7 && SMP
1398 This option enables the workaround for erratum 764369
1399 affecting Cortex-A9 MPCore with two or more processors (all
1400 current revisions). Under certain timing circumstances, a data
1401 cache line maintenance operation by MVA targeting an Inner
1402 Shareable memory region may fail to proceed up to either the
1403 Point of Coherency or to the Point of Unification of the
1404 system. This workaround adds a DSB instruction before the
1405 relevant cache maintenance functions and sets a specific bit
1406 in the diagnostic control register of the SCU.
1408 config PL310_ERRATA_769419
1409 bool "PL310 errata: no automatic Store Buffer drain"
1410 depends on CACHE_L2X0
1412 On revisions of the PL310 prior to r3p2, the Store Buffer does
1413 not automatically drain. This can cause normal, non-cacheable
1414 writes to be retained when the memory system is idle, leading
1415 to suboptimal I/O performance for drivers using coherent DMA.
1416 This option adds a write barrier to the cpu_idle loop so that,
1417 on systems with an outer cache, the store buffer is drained
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 USE_GENERIC_SMP_HELPERS
1504 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
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 (EXPERIMENTAL)"
1608 depends on SMP && HOTPLUG && EXPERIMENTAL
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
1632 Maximum number of GPIOs in the system.
1634 If unsure, leave the default value.
1636 source kernel/Kconfig.preempt
1640 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1641 ARCH_S5PV210 || ARCH_EXYNOS4
1642 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1643 default AT91_TIMER_HZ if ARCH_AT91
1644 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1647 config THUMB2_KERNEL
1648 bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
1649 depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
1651 select ARM_ASM_UNIFIED
1654 By enabling this option, the kernel will be compiled in
1655 Thumb-2 mode. A compiler/assembler that understand the unified
1656 ARM-Thumb syntax is needed.
1660 config THUMB2_AVOID_R_ARM_THM_JUMP11
1661 bool "Work around buggy Thumb-2 short branch relocations in gas"
1662 depends on THUMB2_KERNEL && MODULES
1665 Various binutils versions can resolve Thumb-2 branches to
1666 locally-defined, preemptible global symbols as short-range "b.n"
1667 branch instructions.
1669 This is a problem, because there's no guarantee the final
1670 destination of the symbol, or any candidate locations for a
1671 trampoline, are within range of the branch. For this reason, the
1672 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1673 relocation in modules at all, and it makes little sense to add
1676 The symptom is that the kernel fails with an "unsupported
1677 relocation" error when loading some modules.
1679 Until fixed tools are available, passing
1680 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1681 code which hits this problem, at the cost of a bit of extra runtime
1682 stack usage in some cases.
1684 The problem is described in more detail at:
1685 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1687 Only Thumb-2 kernels are affected.
1689 Unless you are sure your tools don't have this problem, say Y.
1691 config ARM_ASM_UNIFIED
1695 bool "Use the ARM EABI to compile the kernel"
1697 This option allows for the kernel to be compiled using the latest
1698 ARM ABI (aka EABI). This is only useful if you are using a user
1699 space environment that is also compiled with EABI.
1701 Since there are major incompatibilities between the legacy ABI and
1702 EABI, especially with regard to structure member alignment, this
1703 option also changes the kernel syscall calling convention to
1704 disambiguate both ABIs and allow for backward compatibility support
1705 (selected with CONFIG_OABI_COMPAT).
1707 To use this you need GCC version 4.0.0 or later.
1710 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1711 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1714 This option preserves the old syscall interface along with the
1715 new (ARM EABI) one. It also provides a compatibility layer to
1716 intercept syscalls that have structure arguments which layout
1717 in memory differs between the legacy ABI and the new ARM EABI
1718 (only for non "thumb" binaries). This option adds a tiny
1719 overhead to all syscalls and produces a slightly larger kernel.
1720 If you know you'll be using only pure EABI user space then you
1721 can say N here. If this option is not selected and you attempt
1722 to execute a legacy ABI binary then the result will be
1723 UNPREDICTABLE (in fact it can be predicted that it won't work
1724 at all). If in doubt say Y.
1726 config ARCH_HAS_HOLES_MEMORYMODEL
1729 config ARCH_SPARSEMEM_ENABLE
1732 config ARCH_SPARSEMEM_DEFAULT
1733 def_bool ARCH_SPARSEMEM_ENABLE
1735 config ARCH_SELECT_MEMORY_MODEL
1736 def_bool ARCH_SPARSEMEM_ENABLE
1738 config HAVE_ARCH_PFN_VALID
1739 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1742 bool "High Memory Support"
1745 The address space of ARM processors is only 4 Gigabytes large
1746 and it has to accommodate user address space, kernel address
1747 space as well as some memory mapped IO. That means that, if you
1748 have a large amount of physical memory and/or IO, not all of the
1749 memory can be "permanently mapped" by the kernel. The physical
1750 memory that is not permanently mapped is called "high memory".
1752 Depending on the selected kernel/user memory split, minimum
1753 vmalloc space and actual amount of RAM, you may not need this
1754 option which should result in a slightly faster kernel.
1759 bool "Allocate 2nd-level pagetables from highmem"
1762 config HW_PERF_EVENTS
1763 bool "Enable hardware performance counter support for perf events"
1764 depends on PERF_EVENTS && CPU_HAS_PMU
1767 Enable hardware performance counter support for perf events. If
1768 disabled, perf events will use software events only.
1772 config FORCE_MAX_ZONEORDER
1773 int "Maximum zone order" if ARCH_SHMOBILE
1774 range 11 64 if ARCH_SHMOBILE
1775 default "9" if SA1111
1778 The kernel memory allocator divides physically contiguous memory
1779 blocks into "zones", where each zone is a power of two number of
1780 pages. This option selects the largest power of two that the kernel
1781 keeps in the memory allocator. If you need to allocate very large
1782 blocks of physically contiguous memory, then you may need to
1783 increase this value.
1785 This config option is actually maximum order plus one. For example,
1786 a value of 11 means that the largest free memory block is 2^10 pages.
1789 bool "Timer and CPU usage LEDs"
1790 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1791 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1792 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1793 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1794 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1795 ARCH_AT91 || ARCH_DAVINCI || \
1796 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1798 If you say Y here, the LEDs on your machine will be used
1799 to provide useful information about your current system status.
1801 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1802 be able to select which LEDs are active using the options below. If
1803 you are compiling a kernel for the EBSA-110 or the LART however, the
1804 red LED will simply flash regularly to indicate that the system is
1805 still functional. It is safe to say Y here if you have a CATS
1806 system, but the driver will do nothing.
1809 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1810 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1811 || MACH_OMAP_PERSEUS2
1813 depends on !GENERIC_CLOCKEVENTS
1814 default y if ARCH_EBSA110
1816 If you say Y here, one of the system LEDs (the green one on the
1817 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1818 will flash regularly to indicate that the system is still
1819 operational. This is mainly useful to kernel hackers who are
1820 debugging unstable kernels.
1822 The LART uses the same LED for both Timer LED and CPU usage LED
1823 functions. You may choose to use both, but the Timer LED function
1824 will overrule the CPU usage LED.
1827 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1829 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1830 || MACH_OMAP_PERSEUS2
1833 If you say Y here, the red LED will be used to give a good real
1834 time indication of CPU usage, by lighting whenever the idle task
1835 is not currently executing.
1837 The LART uses the same LED for both Timer LED and CPU usage LED
1838 functions. You may choose to use both, but the Timer LED function
1839 will overrule the CPU usage LED.
1841 config ALIGNMENT_TRAP
1843 depends on CPU_CP15_MMU
1844 default y if !ARCH_EBSA110
1845 select HAVE_PROC_CPU if PROC_FS
1847 ARM processors cannot fetch/store information which is not
1848 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1849 address divisible by 4. On 32-bit ARM processors, these non-aligned
1850 fetch/store instructions will be emulated in software if you say
1851 here, which has a severe performance impact. This is necessary for
1852 correct operation of some network protocols. With an IP-only
1853 configuration it is safe to say N, otherwise say Y.
1855 config UACCESS_WITH_MEMCPY
1856 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1857 depends on MMU && EXPERIMENTAL
1858 default y if CPU_FEROCEON
1860 Implement faster copy_to_user and clear_user methods for CPU
1861 cores where a 8-word STM instruction give significantly higher
1862 memory write throughput than a sequence of individual 32bit stores.
1864 A possible side effect is a slight increase in scheduling latency
1865 between threads sharing the same address space if they invoke
1866 such copy operations with large buffers.
1868 However, if the CPU data cache is using a write-allocate mode,
1869 this option is unlikely to provide any performance gain.
1873 prompt "Enable seccomp to safely compute untrusted bytecode"
1875 This kernel feature is useful for number crunching applications
1876 that may need to compute untrusted bytecode during their
1877 execution. By using pipes or other transports made available to
1878 the process as file descriptors supporting the read/write
1879 syscalls, it's possible to isolate those applications in
1880 their own address space using seccomp. Once seccomp is
1881 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1882 and the task is only allowed to execute a few safe syscalls
1883 defined by each seccomp mode.
1885 config CC_STACKPROTECTOR
1886 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1887 depends on EXPERIMENTAL
1889 This option turns on the -fstack-protector GCC feature. This
1890 feature puts, at the beginning of functions, a canary value on
1891 the stack just before the return address, and validates
1892 the value just before actually returning. Stack based buffer
1893 overflows (that need to overwrite this return address) now also
1894 overwrite the canary, which gets detected and the attack is then
1895 neutralized via a kernel panic.
1896 This feature requires gcc version 4.2 or above.
1898 config DEPRECATED_PARAM_STRUCT
1899 bool "Provide old way to pass kernel parameters"
1901 This was deprecated in 2001 and announced to live on for 5 years.
1902 Some old boot loaders still use this way.
1909 bool "Flattened Device Tree support"
1911 select OF_EARLY_FLATTREE
1914 Include support for flattened device tree machine descriptions.
1916 # Compressed boot loader in ROM. Yes, we really want to ask about
1917 # TEXT and BSS so we preserve their values in the config files.
1918 config ZBOOT_ROM_TEXT
1919 hex "Compressed ROM boot loader base address"
1922 The physical address at which the ROM-able zImage is to be
1923 placed in the target. Platforms which normally make use of
1924 ROM-able zImage formats normally set this to a suitable
1925 value in their defconfig file.
1927 If ZBOOT_ROM is not enabled, this has no effect.
1929 config ZBOOT_ROM_BSS
1930 hex "Compressed ROM boot loader BSS address"
1933 The base address of an area of read/write memory in the target
1934 for the ROM-able zImage which must be available while the
1935 decompressor is running. It must be large enough to hold the
1936 entire decompressed kernel plus an additional 128 KiB.
1937 Platforms which normally make use of ROM-able zImage formats
1938 normally set this to a suitable value in their defconfig file.
1940 If ZBOOT_ROM is not enabled, this has no effect.
1943 bool "Compressed boot loader in ROM/flash"
1944 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1946 Say Y here if you intend to execute your compressed kernel image
1947 (zImage) directly from ROM or flash. If unsure, say N.
1950 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1951 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1952 default ZBOOT_ROM_NONE
1954 Include experimental SD/MMC loading code in the ROM-able zImage.
1955 With this enabled it is possible to write the ROM-able zImage
1956 kernel image to an MMC or SD card and boot the kernel straight
1957 from the reset vector. At reset the processor Mask ROM will load
1958 the first part of the ROM-able zImage which in turn loads the
1959 rest the kernel image to RAM.
1961 config ZBOOT_ROM_NONE
1962 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1964 Do not load image from SD or MMC
1966 config ZBOOT_ROM_MMCIF
1967 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1969 Load image from MMCIF hardware block.
1971 config ZBOOT_ROM_SH_MOBILE_SDHI
1972 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1974 Load image from SDHI hardware block
1978 config ARM_APPENDED_DTB
1979 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1980 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1982 With this option, the boot code will look for a device tree binary
1983 (DTB) appended to zImage
1984 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1986 This is meant as a backward compatibility convenience for those
1987 systems with a bootloader that can't be upgraded to accommodate
1988 the documented boot protocol using a device tree.
1990 Beware that there is very little in terms of protection against
1991 this option being confused by leftover garbage in memory that might
1992 look like a DTB header after a reboot if no actual DTB is appended
1993 to zImage. Do not leave this option active in a production kernel
1994 if you don't intend to always append a DTB. Proper passing of the
1995 location into r2 of a bootloader provided DTB is always preferable
1998 config ARM_ATAG_DTB_COMPAT
1999 bool "Supplement the appended DTB with traditional ATAG information"
2000 depends on ARM_APPENDED_DTB
2002 Some old bootloaders can't be updated to a DTB capable one, yet
2003 they provide ATAGs with memory configuration, the ramdisk address,
2004 the kernel cmdline string, etc. Such information is dynamically
2005 provided by the bootloader and can't always be stored in a static
2006 DTB. To allow a device tree enabled kernel to be used with such
2007 bootloaders, this option allows zImage to extract the information
2008 from the ATAG list and store it at run time into the appended DTB.
2011 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
2012 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2014 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2015 bool "Use bootloader kernel arguments if available"
2017 Uses the command-line options passed by the boot loader instead of
2018 the device tree bootargs property. If the boot loader doesn't provide
2019 any, the device tree bootargs property will be used.
2021 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
2022 bool "Extend with bootloader kernel arguments"
2024 The command-line arguments provided by the boot loader will be
2025 appended to the the device tree bootargs property.
2030 string "Default kernel command string"
2033 On some architectures (EBSA110 and CATS), there is currently no way
2034 for the boot loader to pass arguments to the kernel. For these
2035 architectures, you should supply some command-line options at build
2036 time by entering them here. As a minimum, you should specify the
2037 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2040 prompt "Kernel command line type" if CMDLINE != ""
2041 default CMDLINE_FROM_BOOTLOADER
2043 config CMDLINE_FROM_BOOTLOADER
2044 bool "Use bootloader kernel arguments if available"
2046 Uses the command-line options passed by the boot loader. If
2047 the boot loader doesn't provide any, the default kernel command
2048 string provided in CMDLINE will be used.
2050 config CMDLINE_EXTEND
2051 bool "Extend bootloader kernel arguments"
2053 The command-line arguments provided by the boot loader will be
2054 appended to the default kernel command string.
2056 config CMDLINE_FORCE
2057 bool "Always use the default kernel command string"
2059 Always use the default kernel command string, even if the boot
2060 loader passes other arguments to the kernel.
2061 This is useful if you cannot or don't want to change the
2062 command-line options your boot loader passes to the kernel.
2066 bool "Kernel Execute-In-Place from ROM"
2067 depends on !ZBOOT_ROM && !ARM_LPAE
2069 Execute-In-Place allows the kernel to run from non-volatile storage
2070 directly addressable by the CPU, such as NOR flash. This saves RAM
2071 space since the text section of the kernel is not loaded from flash
2072 to RAM. Read-write sections, such as the data section and stack,
2073 are still copied to RAM. The XIP kernel is not compressed since
2074 it has to run directly from flash, so it will take more space to
2075 store it. The flash address used to link the kernel object files,
2076 and for storing it, is configuration dependent. Therefore, if you
2077 say Y here, you must know the proper physical address where to
2078 store the kernel image depending on your own flash memory usage.
2080 Also note that the make target becomes "make xipImage" rather than
2081 "make zImage" or "make Image". The final kernel binary to put in
2082 ROM memory will be arch/arm/boot/xipImage.
2086 config XIP_PHYS_ADDR
2087 hex "XIP Kernel Physical Location"
2088 depends on XIP_KERNEL
2089 default "0x00080000"
2091 This is the physical address in your flash memory the kernel will
2092 be linked for and stored to. This address is dependent on your
2096 bool "Kexec system call (EXPERIMENTAL)"
2097 depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
2099 kexec is a system call that implements the ability to shutdown your
2100 current kernel, and to start another kernel. It is like a reboot
2101 but it is independent of the system firmware. And like a reboot
2102 you can start any kernel with it, not just Linux.
2104 It is an ongoing process to be certain the hardware in a machine
2105 is properly shutdown, so do not be surprised if this code does not
2106 initially work for you. It may help to enable device hotplugging
2110 bool "Export atags in procfs"
2114 Should the atags used to boot the kernel be exported in an "atags"
2115 file in procfs. Useful with kexec.
2118 bool "Build kdump crash kernel (EXPERIMENTAL)"
2119 depends on EXPERIMENTAL
2121 Generate crash dump after being started by kexec. This should
2122 be normally only set in special crash dump kernels which are
2123 loaded in the main kernel with kexec-tools into a specially
2124 reserved region and then later executed after a crash by
2125 kdump/kexec. The crash dump kernel must be compiled to a
2126 memory address not used by the main kernel
2128 For more details see Documentation/kdump/kdump.txt
2130 config AUTO_ZRELADDR
2131 bool "Auto calculation of the decompressed kernel image address"
2132 depends on !ZBOOT_ROM && !ARCH_U300
2134 ZRELADDR is the physical address where the decompressed kernel
2135 image will be placed. If AUTO_ZRELADDR is selected, the address
2136 will be determined at run-time by masking the current IP with
2137 0xf8000000. This assumes the zImage being placed in the first 128MB
2138 from start of memory.
2142 menu "CPU Power Management"
2146 source "drivers/cpufreq/Kconfig"
2149 tristate "CPUfreq driver for i.MX CPUs"
2150 depends on ARCH_MXC && CPU_FREQ
2152 This enables the CPUfreq driver for i.MX CPUs.
2154 config CPU_FREQ_SA1100
2157 config CPU_FREQ_SA1110
2160 config CPU_FREQ_INTEGRATOR
2161 tristate "CPUfreq driver for ARM Integrator CPUs"
2162 depends on ARCH_INTEGRATOR && CPU_FREQ
2165 This enables the CPUfreq driver for ARM Integrator CPUs.
2167 For details, take a look at <file:Documentation/cpu-freq>.
2173 depends on CPU_FREQ && ARCH_PXA && PXA25x
2175 select CPU_FREQ_TABLE
2176 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2181 Internal configuration node for common cpufreq on Samsung SoC
2183 config CPU_FREQ_S3C24XX
2184 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2185 depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
2188 This enables the CPUfreq driver for the Samsung S3C24XX family
2191 For details, take a look at <file:Documentation/cpu-freq>.
2195 config CPU_FREQ_S3C24XX_PLL
2196 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2197 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2199 Compile in support for changing the PLL frequency from the
2200 S3C24XX series CPUfreq driver. The PLL takes time to settle
2201 after a frequency change, so by default it is not enabled.
2203 This also means that the PLL tables for the selected CPU(s) will
2204 be built which may increase the size of the kernel image.
2206 config CPU_FREQ_S3C24XX_DEBUG
2207 bool "Debug CPUfreq Samsung driver core"
2208 depends on CPU_FREQ_S3C24XX
2210 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2212 config CPU_FREQ_S3C24XX_IODEBUG
2213 bool "Debug CPUfreq Samsung driver IO timing"
2214 depends on CPU_FREQ_S3C24XX
2216 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2218 config CPU_FREQ_S3C24XX_DEBUGFS
2219 bool "Export debugfs for CPUFreq"
2220 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2222 Export status information via debugfs.
2226 source "drivers/cpuidle/Kconfig"
2230 menu "Floating point emulation"
2232 comment "At least one emulation must be selected"
2235 bool "NWFPE math emulation"
2236 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2238 Say Y to include the NWFPE floating point emulator in the kernel.
2239 This is necessary to run most binaries. Linux does not currently
2240 support floating point hardware so you need to say Y here even if
2241 your machine has an FPA or floating point co-processor podule.
2243 You may say N here if you are going to load the Acorn FPEmulator
2244 early in the bootup.
2247 bool "Support extended precision"
2248 depends on FPE_NWFPE
2250 Say Y to include 80-bit support in the kernel floating-point
2251 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2252 Note that gcc does not generate 80-bit operations by default,
2253 so in most cases this option only enlarges the size of the
2254 floating point emulator without any good reason.
2256 You almost surely want to say N here.
2259 bool "FastFPE math emulation (EXPERIMENTAL)"
2260 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2262 Say Y here to include the FAST floating point emulator in the kernel.
2263 This is an experimental much faster emulator which now also has full
2264 precision for the mantissa. It does not support any exceptions.
2265 It is very simple, and approximately 3-6 times faster than NWFPE.
2267 It should be sufficient for most programs. It may be not suitable
2268 for scientific calculations, but you have to check this for yourself.
2269 If you do not feel you need a faster FP emulation you should better
2273 bool "VFP-format floating point maths"
2274 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2276 Say Y to include VFP support code in the kernel. This is needed
2277 if your hardware includes a VFP unit.
2279 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2280 release notes and additional status information.
2282 Say N if your target does not have VFP hardware.
2290 bool "Advanced SIMD (NEON) Extension support"
2291 depends on VFPv3 && CPU_V7
2293 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2298 menu "Userspace binary formats"
2300 source "fs/Kconfig.binfmt"
2303 tristate "RISC OS personality"
2306 Say Y here to include the kernel code necessary if you want to run
2307 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2308 experimental; if this sounds frightening, say N and sleep in peace.
2309 You can also say M here to compile this support as a module (which
2310 will be called arthur).
2314 menu "Power management options"
2316 source "kernel/power/Kconfig"
2318 config ARCH_SUSPEND_POSSIBLE
2319 depends on !ARCH_S5PC100 && !ARCH_TEGRA
2320 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2321 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2324 config ARM_CPU_SUSPEND
2329 source "net/Kconfig"
2331 source "drivers/Kconfig"
2335 source "arch/arm/Kconfig.debug"
2337 source "security/Kconfig"
2339 source "crypto/Kconfig"
2341 source "lib/Kconfig"