5 select HAVE_DMA_API_DEBUG
6 select HAVE_IDE if PCI || ISA || PCMCIA
9 select SYS_SUPPORTS_APM_EMULATION
10 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
11 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
12 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
14 select HAVE_KPROBES if !XIP_KERNEL
15 select HAVE_KRETPROBES if (HAVE_KPROBES)
16 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
17 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
18 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
19 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
20 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
21 select HAVE_GENERIC_DMA_COHERENT
22 select HAVE_KERNEL_GZIP
23 select HAVE_KERNEL_LZO
24 select HAVE_KERNEL_LZMA
27 select HAVE_PERF_EVENTS
28 select PERF_USE_VMALLOC
29 select HAVE_REGS_AND_STACK_ACCESS_API
30 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
31 select HAVE_C_RECORDMCOUNT
32 select HAVE_GENERIC_HARDIRQS
33 select GENERIC_IRQ_SHOW
34 select CPU_PM if (SUSPEND || CPU_IDLE)
35 select GENERIC_PCI_IOMAP
36 select HAVE_BPF_JIT if NET
38 The ARM series is a line of low-power-consumption RISC chip designs
39 licensed by ARM Ltd and targeted at embedded applications and
40 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
41 manufactured, but legacy ARM-based PC hardware remains popular in
42 Europe. There is an ARM Linux project with a web page at
43 <http://www.arm.linux.org.uk/>.
45 config ARM_HAS_SG_CHAIN
54 config SYS_SUPPORTS_APM_EMULATION
60 config ARCH_USES_GETTIMEOFFSET
64 config GENERIC_CLOCKEVENTS
67 config GENERIC_CLOCKEVENTS_BROADCAST
69 depends on GENERIC_CLOCKEVENTS
78 select GENERIC_ALLOCATOR
89 The Extended Industry Standard Architecture (EISA) bus was
90 developed as an open alternative to the IBM MicroChannel bus.
92 The EISA bus provided some of the features of the IBM MicroChannel
93 bus while maintaining backward compatibility with cards made for
94 the older ISA bus. The EISA bus saw limited use between 1988 and
95 1995 when it was made obsolete by the PCI bus.
97 Say Y here if you are building a kernel for an EISA-based machine.
107 MicroChannel Architecture is found in some IBM PS/2 machines and
108 laptops. It is a bus system similar to PCI or ISA. See
109 <file:Documentation/mca.txt> (and especially the web page given
110 there) before attempting to build an MCA bus kernel.
112 config STACKTRACE_SUPPORT
116 config HAVE_LATENCYTOP_SUPPORT
121 config LOCKDEP_SUPPORT
125 config TRACE_IRQFLAGS_SUPPORT
129 config HARDIRQS_SW_RESEND
133 config GENERIC_IRQ_PROBE
137 config GENERIC_LOCKBREAK
140 depends on SMP && PREEMPT
142 config RWSEM_GENERIC_SPINLOCK
146 config RWSEM_XCHGADD_ALGORITHM
149 config ARCH_HAS_ILOG2_U32
152 config ARCH_HAS_ILOG2_U64
155 config ARCH_HAS_CPUFREQ
158 Internal node to signify that the ARCH has CPUFREQ support
159 and that the relevant menu configurations are displayed for
162 config ARCH_HAS_CPU_IDLE_WAIT
165 config GENERIC_HWEIGHT
169 config GENERIC_CALIBRATE_DELAY
173 config ARCH_MAY_HAVE_PC_FDC
179 config NEED_DMA_MAP_STATE
182 config ARCH_HAS_DMA_SET_COHERENT_MASK
185 config GENERIC_ISA_DMA
191 config NEED_RET_TO_USER
199 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
200 default DRAM_BASE if REMAP_VECTORS_TO_RAM
203 The base address of exception vectors.
205 config ARM_PATCH_PHYS_VIRT
206 bool "Patch physical to virtual translations at runtime" if EMBEDDED
208 depends on !XIP_KERNEL && MMU
209 depends on !ARCH_REALVIEW || !SPARSEMEM
211 Patch phys-to-virt and virt-to-phys translation functions at
212 boot and module load time according to the position of the
213 kernel in system memory.
215 This can only be used with non-XIP MMU kernels where the base
216 of physical memory is at a 16MB boundary.
218 Only disable this option if you know that you do not require
219 this feature (eg, building a kernel for a single machine) and
220 you need to shrink the kernel to the minimal size.
222 config NEED_MACH_IO_H
225 Select this when mach/io.h is required to provide special
226 definitions for this platform. The need for mach/io.h should
227 be avoided when possible.
229 config NEED_MACH_MEMORY_H
232 Select this when mach/memory.h is required to provide special
233 definitions for this platform. The need for mach/memory.h should
234 be avoided when possible.
237 hex "Physical address of main memory" if MMU
238 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
239 default DRAM_BASE if !MMU
241 Please provide the physical address corresponding to the
242 location of main memory in your system.
248 source "init/Kconfig"
250 source "kernel/Kconfig.freezer"
255 bool "MMU-based Paged Memory Management Support"
258 Select if you want MMU-based virtualised addressing space
259 support by paged memory management. If unsure, say 'Y'.
262 # The "ARM system type" choice list is ordered alphabetically by option
263 # text. Please add new entries in the option alphabetic order.
266 prompt "ARM system type"
267 default ARCH_VERSATILE
269 config ARCH_INTEGRATOR
270 bool "ARM Ltd. Integrator family"
272 select ARCH_HAS_CPUFREQ
274 select HAVE_MACH_CLKDEV
277 select GENERIC_CLOCKEVENTS
278 select PLAT_VERSATILE
279 select PLAT_VERSATILE_FPGA_IRQ
280 select NEED_MACH_IO_H
281 select NEED_MACH_MEMORY_H
284 Support for ARM's Integrator platform.
287 bool "ARM Ltd. RealView family"
290 select HAVE_MACH_CLKDEV
292 select GENERIC_CLOCKEVENTS
293 select ARCH_WANT_OPTIONAL_GPIOLIB
294 select PLAT_VERSATILE
295 select PLAT_VERSATILE_CLCD
296 select ARM_TIMER_SP804
297 select GPIO_PL061 if GPIOLIB
298 select NEED_MACH_MEMORY_H
300 This enables support for ARM Ltd RealView boards.
302 config ARCH_VERSATILE
303 bool "ARM Ltd. Versatile family"
307 select HAVE_MACH_CLKDEV
309 select GENERIC_CLOCKEVENTS
310 select ARCH_WANT_OPTIONAL_GPIOLIB
311 select PLAT_VERSATILE
312 select PLAT_VERSATILE_CLCD
313 select PLAT_VERSATILE_FPGA_IRQ
314 select ARM_TIMER_SP804
316 This enables support for ARM Ltd Versatile board.
319 bool "ARM Ltd. Versatile Express family"
320 select ARCH_WANT_OPTIONAL_GPIOLIB
322 select ARM_TIMER_SP804
324 select HAVE_MACH_CLKDEV
325 select GENERIC_CLOCKEVENTS
327 select HAVE_PATA_PLATFORM
330 select PLAT_VERSATILE
331 select PLAT_VERSATILE_CLCD
333 This enables support for the ARM Ltd Versatile Express boards.
337 select ARCH_REQUIRE_GPIOLIB
342 This enables support for systems based on the Atmel AT91RM9200,
346 bool "Broadcom BCMRING"
350 select ARM_TIMER_SP804
352 select GENERIC_CLOCKEVENTS
353 select ARCH_WANT_OPTIONAL_GPIOLIB
355 Support for Broadcom's BCMRing platform.
358 bool "Calxeda Highbank-based"
359 select ARCH_WANT_OPTIONAL_GPIOLIB
362 select ARM_TIMER_SP804
366 select GENERIC_CLOCKEVENTS
372 Support for the Calxeda Highbank SoC based boards.
375 bool "Cirrus Logic CLPS711x/EP721x-based"
377 select ARCH_USES_GETTIMEOFFSET
378 select NEED_MACH_MEMORY_H
380 Support for Cirrus Logic 711x/721x based boards.
383 bool "Cavium Networks CNS3XXX family"
385 select GENERIC_CLOCKEVENTS
387 select MIGHT_HAVE_CACHE_L2X0
388 select MIGHT_HAVE_PCI
389 select PCI_DOMAINS if PCI
391 Support for Cavium Networks CNS3XXX platform.
394 bool "Cortina Systems Gemini"
396 select ARCH_REQUIRE_GPIOLIB
397 select ARCH_USES_GETTIMEOFFSET
399 Support for the Cortina Systems Gemini family SoCs
402 bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
405 select GENERIC_CLOCKEVENTS
407 select GENERIC_IRQ_CHIP
408 select MIGHT_HAVE_CACHE_L2X0
412 Support for CSR SiRFSoC ARM Cortex A9 Platform
419 select ARCH_USES_GETTIMEOFFSET
420 select NEED_MACH_IO_H
421 select NEED_MACH_MEMORY_H
423 This is an evaluation board for the StrongARM processor available
424 from Digital. It has limited hardware on-board, including an
425 Ethernet interface, two PCMCIA sockets, two serial ports and a
434 select ARCH_REQUIRE_GPIOLIB
435 select ARCH_HAS_HOLES_MEMORYMODEL
436 select ARCH_USES_GETTIMEOFFSET
437 select NEED_MACH_MEMORY_H
439 This enables support for the Cirrus EP93xx series of CPUs.
441 config ARCH_FOOTBRIDGE
445 select GENERIC_CLOCKEVENTS
447 select NEED_MACH_IO_H
448 select NEED_MACH_MEMORY_H
450 Support for systems based on the DC21285 companion chip
451 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
454 bool "Freescale MXC/iMX-based"
455 select GENERIC_CLOCKEVENTS
456 select ARCH_REQUIRE_GPIOLIB
459 select GENERIC_IRQ_CHIP
460 select MULTI_IRQ_HANDLER
462 Support for Freescale MXC/iMX-based family of processors
465 bool "Freescale MXS-based"
466 select GENERIC_CLOCKEVENTS
467 select ARCH_REQUIRE_GPIOLIB
470 select HAVE_CLK_PREPARE
472 Support for Freescale MXS-based family of processors
475 bool "Hilscher NetX based"
479 select GENERIC_CLOCKEVENTS
481 This enables support for systems based on the Hilscher NetX Soc
484 bool "Hynix HMS720x-based"
487 select ARCH_USES_GETTIMEOFFSET
489 This enables support for systems based on the Hynix HMS720x
497 select ARCH_SUPPORTS_MSI
499 select NEED_MACH_IO_H
500 select NEED_MACH_MEMORY_H
501 select NEED_RET_TO_USER
503 Support for Intel's IOP13XX (XScale) family of processors.
509 select NEED_MACH_IO_H
510 select NEED_RET_TO_USER
513 select ARCH_REQUIRE_GPIOLIB
515 Support for Intel's 80219 and IOP32X (XScale) family of
522 select NEED_MACH_IO_H
523 select NEED_RET_TO_USER
526 select ARCH_REQUIRE_GPIOLIB
528 Support for Intel's IOP33X (XScale) family of processors.
535 select ARCH_USES_GETTIMEOFFSET
536 select NEED_MACH_IO_H
537 select NEED_MACH_MEMORY_H
539 Support for Intel's IXP23xx (XScale) family of processors.
542 bool "IXP2400/2800-based"
546 select ARCH_USES_GETTIMEOFFSET
547 select NEED_MACH_IO_H
548 select NEED_MACH_MEMORY_H
550 Support for Intel's IXP2400/2800 (XScale) family of processors.
555 select ARCH_HAS_DMA_SET_COHERENT_MASK
559 select GENERIC_CLOCKEVENTS
560 select MIGHT_HAVE_PCI
561 select NEED_MACH_IO_H
562 select DMABOUNCE if PCI
564 Support for Intel's IXP4XX (XScale) family of processors.
570 select ARCH_REQUIRE_GPIOLIB
571 select GENERIC_CLOCKEVENTS
572 select NEED_MACH_IO_H
575 Support for the Marvell Dove SoC 88AP510
578 bool "Marvell Kirkwood"
581 select ARCH_REQUIRE_GPIOLIB
582 select GENERIC_CLOCKEVENTS
583 select NEED_MACH_IO_H
586 Support for the following Marvell Kirkwood series SoCs:
587 88F6180, 88F6192 and 88F6281.
593 select ARCH_REQUIRE_GPIOLIB
596 select USB_ARCH_HAS_OHCI
598 select GENERIC_CLOCKEVENTS
600 Support for the NXP LPC32XX family of processors
603 bool "Marvell MV78xx0"
606 select ARCH_REQUIRE_GPIOLIB
607 select GENERIC_CLOCKEVENTS
608 select NEED_MACH_IO_H
611 Support for the following Marvell MV78xx0 series SoCs:
619 select ARCH_REQUIRE_GPIOLIB
620 select GENERIC_CLOCKEVENTS
623 Support for the following Marvell Orion 5x series SoCs:
624 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
625 Orion-2 (5281), Orion-1-90 (6183).
628 bool "Marvell PXA168/910/MMP2"
630 select ARCH_REQUIRE_GPIOLIB
632 select GENERIC_CLOCKEVENTS
637 select GENERIC_ALLOCATOR
639 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
642 bool "Micrel/Kendin KS8695"
644 select ARCH_REQUIRE_GPIOLIB
645 select ARCH_USES_GETTIMEOFFSET
646 select NEED_MACH_MEMORY_H
648 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
649 System-on-Chip devices.
652 bool "Nuvoton W90X900 CPU"
654 select ARCH_REQUIRE_GPIOLIB
657 select GENERIC_CLOCKEVENTS
659 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
660 At present, the w90x900 has been renamed nuc900, regarding
661 the ARM series product line, you can login the following
662 link address to know more.
664 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
665 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
671 select GENERIC_CLOCKEVENTS
675 select MIGHT_HAVE_CACHE_L2X0
676 select NEED_MACH_IO_H if PCI
677 select ARCH_HAS_CPUFREQ
679 This enables support for NVIDIA Tegra based systems (Tegra APX,
680 Tegra 6xx and Tegra 2 series).
682 config ARCH_PICOXCELL
683 bool "Picochip picoXcell"
684 select ARCH_REQUIRE_GPIOLIB
685 select ARM_PATCH_PHYS_VIRT
689 select GENERIC_CLOCKEVENTS
696 This enables support for systems based on the Picochip picoXcell
697 family of Femtocell devices. The picoxcell support requires device tree
701 bool "Philips Nexperia PNX4008 Mobile"
704 select ARCH_USES_GETTIMEOFFSET
706 This enables support for Philips PNX4008 mobile platform.
709 bool "PXA2xx/PXA3xx-based"
712 select ARCH_HAS_CPUFREQ
715 select ARCH_REQUIRE_GPIOLIB
716 select GENERIC_CLOCKEVENTS
722 select MULTI_IRQ_HANDLER
723 select ARM_CPU_SUSPEND if PM
726 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
731 select GENERIC_CLOCKEVENTS
732 select ARCH_REQUIRE_GPIOLIB
735 Support for Qualcomm MSM/QSD based systems. This runs on the
736 apps processor of the MSM/QSD and depends on a shared memory
737 interface to the modem processor which runs the baseband
738 stack and controls some vital subsystems
739 (clock and power control, etc).
742 bool "Renesas SH-Mobile / R-Mobile"
745 select HAVE_MACH_CLKDEV
747 select GENERIC_CLOCKEVENTS
748 select MIGHT_HAVE_CACHE_L2X0
751 select MULTI_IRQ_HANDLER
752 select PM_GENERIC_DOMAINS if PM
753 select NEED_MACH_MEMORY_H
755 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
761 select ARCH_MAY_HAVE_PC_FDC
762 select HAVE_PATA_PLATFORM
765 select ARCH_SPARSEMEM_ENABLE
766 select ARCH_USES_GETTIMEOFFSET
768 select NEED_MACH_IO_H
769 select NEED_MACH_MEMORY_H
771 On the Acorn Risc-PC, Linux can support the internal IDE disk and
772 CD-ROM interface, serial and parallel port, and the floppy drive.
779 select ARCH_SPARSEMEM_ENABLE
781 select ARCH_HAS_CPUFREQ
783 select GENERIC_CLOCKEVENTS
786 select ARCH_REQUIRE_GPIOLIB
788 select NEED_MACH_MEMORY_H
791 Support for StrongARM 11x0 based boards.
794 bool "Samsung S3C24XX SoCs"
796 select ARCH_HAS_CPUFREQ
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_IO_H
805 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
806 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
807 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
808 Samsung SMDK2410 development board (and derivatives).
811 bool "Samsung S3C64XX"
819 select ARCH_USES_GETTIMEOFFSET
820 select ARCH_HAS_CPUFREQ
821 select ARCH_REQUIRE_GPIOLIB
822 select SAMSUNG_CLKSRC
823 select SAMSUNG_IRQ_VIC_TIMER
824 select S3C_GPIO_TRACK
826 select USB_ARCH_HAS_OHCI
827 select SAMSUNG_GPIOLIB_4BIT
828 select HAVE_S3C2410_I2C if I2C
829 select HAVE_S3C2410_WATCHDOG if WATCHDOG
831 Samsung S3C64XX series based systems
834 bool "Samsung S5P6440 S5P6450"
840 select HAVE_S3C2410_WATCHDOG if WATCHDOG
841 select GENERIC_CLOCKEVENTS
842 select HAVE_S3C2410_I2C if I2C
843 select HAVE_S3C_RTC if RTC_CLASS
845 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
849 bool "Samsung S5PC100"
854 select ARCH_USES_GETTIMEOFFSET
855 select HAVE_S3C2410_I2C if I2C
856 select HAVE_S3C_RTC if RTC_CLASS
857 select HAVE_S3C2410_WATCHDOG if WATCHDOG
859 Samsung S5PC100 series based systems
862 bool "Samsung S5PV210/S5PC110"
864 select ARCH_SPARSEMEM_ENABLE
865 select ARCH_HAS_HOLES_MEMORYMODEL
870 select ARCH_HAS_CPUFREQ
871 select GENERIC_CLOCKEVENTS
872 select HAVE_S3C2410_I2C if I2C
873 select HAVE_S3C_RTC if RTC_CLASS
874 select HAVE_S3C2410_WATCHDOG if WATCHDOG
875 select NEED_MACH_MEMORY_H
877 Samsung S5PV210/S5PC110 series based systems
880 bool "SAMSUNG EXYNOS"
882 select ARCH_SPARSEMEM_ENABLE
883 select ARCH_HAS_HOLES_MEMORYMODEL
887 select ARCH_HAS_CPUFREQ
888 select GENERIC_CLOCKEVENTS
889 select HAVE_S3C_RTC if RTC_CLASS
890 select HAVE_S3C2410_I2C if I2C
891 select HAVE_S3C2410_WATCHDOG if WATCHDOG
892 select NEED_MACH_MEMORY_H
894 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
903 select ARCH_USES_GETTIMEOFFSET
904 select NEED_MACH_MEMORY_H
905 select NEED_MACH_IO_H
907 Support for the StrongARM based Digital DNARD machine, also known
908 as "Shark" (<http://www.shark-linux.de/shark.html>).
911 bool "ST-Ericsson U300 Series"
917 select ARM_PATCH_PHYS_VIRT
919 select GENERIC_CLOCKEVENTS
921 select HAVE_MACH_CLKDEV
923 select ARCH_REQUIRE_GPIOLIB
925 Support for ST-Ericsson U300 series mobile platforms.
928 bool "ST-Ericsson U8500 Series"
932 select GENERIC_CLOCKEVENTS
934 select ARCH_REQUIRE_GPIOLIB
935 select ARCH_HAS_CPUFREQ
937 select MIGHT_HAVE_CACHE_L2X0
939 Support for ST-Ericsson's Ux500 architecture
942 bool "STMicroelectronics Nomadik"
947 select GENERIC_CLOCKEVENTS
948 select MIGHT_HAVE_CACHE_L2X0
949 select ARCH_REQUIRE_GPIOLIB
951 Support for the Nomadik platform by ST-Ericsson
955 select GENERIC_CLOCKEVENTS
956 select ARCH_REQUIRE_GPIOLIB
960 select GENERIC_ALLOCATOR
961 select GENERIC_IRQ_CHIP
962 select ARCH_HAS_HOLES_MEMORYMODEL
964 Support for TI's DaVinci platform.
969 select ARCH_REQUIRE_GPIOLIB
970 select ARCH_HAS_CPUFREQ
972 select GENERIC_CLOCKEVENTS
973 select ARCH_HAS_HOLES_MEMORYMODEL
975 Support for TI's OMAP platform (OMAP1/2/3/4).
980 select ARCH_REQUIRE_GPIOLIB
983 select GENERIC_CLOCKEVENTS
986 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
989 bool "VIA/WonderMedia 85xx"
992 select ARCH_HAS_CPUFREQ
993 select GENERIC_CLOCKEVENTS
994 select ARCH_REQUIRE_GPIOLIB
997 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
1000 bool "Xilinx Zynq ARM Cortex A9 Platform"
1002 select GENERIC_CLOCKEVENTS
1003 select CLKDEV_LOOKUP
1007 select MIGHT_HAVE_CACHE_L2X0
1010 Support for Xilinx Zynq ARM Cortex A9 Platform
1014 # This is sorted alphabetically by mach-* pathname. However, plat-*
1015 # Kconfigs may be included either alphabetically (according to the
1016 # plat- suffix) or along side the corresponding mach-* source.
1018 source "arch/arm/mach-at91/Kconfig"
1020 source "arch/arm/mach-bcmring/Kconfig"
1022 source "arch/arm/mach-clps711x/Kconfig"
1024 source "arch/arm/mach-cns3xxx/Kconfig"
1026 source "arch/arm/mach-davinci/Kconfig"
1028 source "arch/arm/mach-dove/Kconfig"
1030 source "arch/arm/mach-ep93xx/Kconfig"
1032 source "arch/arm/mach-footbridge/Kconfig"
1034 source "arch/arm/mach-gemini/Kconfig"
1036 source "arch/arm/mach-h720x/Kconfig"
1038 source "arch/arm/mach-integrator/Kconfig"
1040 source "arch/arm/mach-iop32x/Kconfig"
1042 source "arch/arm/mach-iop33x/Kconfig"
1044 source "arch/arm/mach-iop13xx/Kconfig"
1046 source "arch/arm/mach-ixp4xx/Kconfig"
1048 source "arch/arm/mach-ixp2000/Kconfig"
1050 source "arch/arm/mach-ixp23xx/Kconfig"
1052 source "arch/arm/mach-kirkwood/Kconfig"
1054 source "arch/arm/mach-ks8695/Kconfig"
1056 source "arch/arm/mach-lpc32xx/Kconfig"
1058 source "arch/arm/mach-msm/Kconfig"
1060 source "arch/arm/mach-mv78xx0/Kconfig"
1062 source "arch/arm/plat-mxc/Kconfig"
1064 source "arch/arm/mach-mxs/Kconfig"
1066 source "arch/arm/mach-netx/Kconfig"
1068 source "arch/arm/mach-nomadik/Kconfig"
1069 source "arch/arm/plat-nomadik/Kconfig"
1071 source "arch/arm/plat-omap/Kconfig"
1073 source "arch/arm/mach-omap1/Kconfig"
1075 source "arch/arm/mach-omap2/Kconfig"
1077 source "arch/arm/mach-orion5x/Kconfig"
1079 source "arch/arm/mach-pxa/Kconfig"
1080 source "arch/arm/plat-pxa/Kconfig"
1082 source "arch/arm/mach-mmp/Kconfig"
1084 source "arch/arm/mach-realview/Kconfig"
1086 source "arch/arm/mach-sa1100/Kconfig"
1088 source "arch/arm/plat-samsung/Kconfig"
1089 source "arch/arm/plat-s3c24xx/Kconfig"
1090 source "arch/arm/plat-s5p/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-tegra/Kconfig"
1116 source "arch/arm/mach-u300/Kconfig"
1118 source "arch/arm/mach-ux500/Kconfig"
1120 source "arch/arm/mach-versatile/Kconfig"
1122 source "arch/arm/mach-vexpress/Kconfig"
1123 source "arch/arm/plat-versatile/Kconfig"
1125 source "arch/arm/mach-vt8500/Kconfig"
1127 source "arch/arm/mach-w90x900/Kconfig"
1129 # Definitions to make life easier
1135 select GENERIC_CLOCKEVENTS
1140 select GENERIC_IRQ_CHIP
1145 config PLAT_VERSATILE
1148 config ARM_TIMER_SP804
1151 select HAVE_SCHED_CLOCK
1153 source arch/arm/mm/Kconfig
1157 default 16 if ARCH_EP93XX
1161 bool "Enable iWMMXt support"
1162 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1163 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1165 Enable support for iWMMXt context switching at run time if
1166 running on a CPU that supports it.
1170 depends on CPU_XSCALE
1174 depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
1175 (!ARCH_OMAP3 || OMAP3_EMU)
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_411920
1189 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1190 depends on CPU_V6 || CPU_V6K
1192 Invalidation of the Instruction Cache operation can
1193 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1194 It does not affect the MPCore. This option enables the ARM Ltd.
1195 recommended workaround.
1197 config ARM_ERRATA_430973
1198 bool "ARM errata: Stale prediction on replaced interworking branch"
1201 This option enables the workaround for the 430973 Cortex-A8
1202 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1203 interworking branch is replaced with another code sequence at the
1204 same virtual address, whether due to self-modifying code or virtual
1205 to physical address re-mapping, Cortex-A8 does not recover from the
1206 stale interworking branch prediction. This results in Cortex-A8
1207 executing the new code sequence in the incorrect ARM or Thumb state.
1208 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1209 and also flushes the branch target cache at every context switch.
1210 Note that setting specific bits in the ACTLR register may not be
1211 available in non-secure mode.
1213 config ARM_ERRATA_458693
1214 bool "ARM errata: Processor deadlock when a false hazard is created"
1217 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1218 erratum. For very specific sequences of memory operations, it is
1219 possible for a hazard condition intended for a cache line to instead
1220 be incorrectly associated with a different cache line. This false
1221 hazard might then cause a processor deadlock. The workaround enables
1222 the L1 caching of the NEON accesses and disables the PLD instruction
1223 in the ACTLR register. Note that setting specific bits in the ACTLR
1224 register may not be available in non-secure mode.
1226 config ARM_ERRATA_460075
1227 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1230 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1231 erratum. Any asynchronous access to the L2 cache may encounter a
1232 situation in which recent store transactions to the L2 cache are lost
1233 and overwritten with stale memory contents from external memory. The
1234 workaround disables the write-allocate mode for the L2 cache via the
1235 ACTLR register. Note that setting specific bits in the ACTLR register
1236 may not be available in non-secure mode.
1238 config ARM_ERRATA_742230
1239 bool "ARM errata: DMB operation may be faulty"
1240 depends on CPU_V7 && SMP
1242 This option enables the workaround for the 742230 Cortex-A9
1243 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1244 between two write operations may not ensure the correct visibility
1245 ordering of the two writes. This workaround sets a specific bit in
1246 the diagnostic register of the Cortex-A9 which causes the DMB
1247 instruction to behave as a DSB, ensuring the correct behaviour of
1250 config ARM_ERRATA_742231
1251 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1252 depends on CPU_V7 && SMP
1254 This option enables the workaround for the 742231 Cortex-A9
1255 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1256 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1257 accessing some data located in the same cache line, may get corrupted
1258 data due to bad handling of the address hazard when the line gets
1259 replaced from one of the CPUs at the same time as another CPU is
1260 accessing it. This workaround sets specific bits in the diagnostic
1261 register of the Cortex-A9 which reduces the linefill issuing
1262 capabilities of the processor.
1264 config PL310_ERRATA_588369
1265 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1266 depends on CACHE_L2X0
1268 The PL310 L2 cache controller implements three types of Clean &
1269 Invalidate maintenance operations: by Physical Address
1270 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1271 They are architecturally defined to behave as the execution of a
1272 clean operation followed immediately by an invalidate operation,
1273 both performing to the same memory location. This functionality
1274 is not correctly implemented in PL310 as clean lines are not
1275 invalidated as a result of these operations.
1277 config ARM_ERRATA_720789
1278 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1281 This option enables the workaround for the 720789 Cortex-A9 (prior to
1282 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1283 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1284 As a consequence of this erratum, some TLB entries which should be
1285 invalidated are not, resulting in an incoherency in the system page
1286 tables. The workaround changes the TLB flushing routines to invalidate
1287 entries regardless of the ASID.
1289 config PL310_ERRATA_727915
1290 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1291 depends on CACHE_L2X0
1293 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1294 operation (offset 0x7FC). This operation runs in background so that
1295 PL310 can handle normal accesses while it is in progress. Under very
1296 rare circumstances, due to this erratum, write data can be lost when
1297 PL310 treats a cacheable write transaction during a Clean &
1298 Invalidate by Way operation.
1300 config ARM_ERRATA_743622
1301 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1304 This option enables the workaround for the 743622 Cortex-A9
1305 (r2p*) erratum. Under very rare conditions, a faulty
1306 optimisation in the Cortex-A9 Store Buffer may lead to data
1307 corruption. This workaround sets a specific bit in the diagnostic
1308 register of the Cortex-A9 which disables the Store Buffer
1309 optimisation, preventing the defect from occurring. This has no
1310 visible impact on the overall performance or power consumption of the
1313 config ARM_ERRATA_751472
1314 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1317 This option enables the workaround for the 751472 Cortex-A9 (prior
1318 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1319 completion of a following broadcasted operation if the second
1320 operation is received by a CPU before the ICIALLUIS has completed,
1321 potentially leading to corrupted entries in the cache or TLB.
1323 config PL310_ERRATA_753970
1324 bool "PL310 errata: cache sync operation may be faulty"
1325 depends on CACHE_PL310
1327 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1329 Under some condition the effect of cache sync operation on
1330 the store buffer still remains when the operation completes.
1331 This means that the store buffer is always asked to drain and
1332 this prevents it from merging any further writes. The workaround
1333 is to replace the normal offset of cache sync operation (0x730)
1334 by another offset targeting an unmapped PL310 register 0x740.
1335 This has the same effect as the cache sync operation: store buffer
1336 drain and waiting for all buffers empty.
1338 config ARM_ERRATA_754322
1339 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1342 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1343 r3p*) erratum. A speculative memory access may cause a page table walk
1344 which starts prior to an ASID switch but completes afterwards. This
1345 can populate the micro-TLB with a stale entry which may be hit with
1346 the new ASID. This workaround places two dsb instructions in the mm
1347 switching code so that no page table walks can cross the ASID switch.
1349 config ARM_ERRATA_754327
1350 bool "ARM errata: no automatic Store Buffer drain"
1351 depends on CPU_V7 && SMP
1353 This option enables the workaround for the 754327 Cortex-A9 (prior to
1354 r2p0) erratum. The Store Buffer does not have any automatic draining
1355 mechanism and therefore a livelock may occur if an external agent
1356 continuously polls a memory location waiting to observe an update.
1357 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1358 written polling loops from denying visibility of updates to memory.
1360 config ARM_ERRATA_364296
1361 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1362 depends on CPU_V6 && !SMP
1364 This options enables the workaround for the 364296 ARM1136
1365 r0p2 erratum (possible cache data corruption with
1366 hit-under-miss enabled). It sets the undocumented bit 31 in
1367 the auxiliary control register and the FI bit in the control
1368 register, thus disabling hit-under-miss without putting the
1369 processor into full low interrupt latency mode. ARM11MPCore
1372 config ARM_ERRATA_764369
1373 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1374 depends on CPU_V7 && SMP
1376 This option enables the workaround for erratum 764369
1377 affecting Cortex-A9 MPCore with two or more processors (all
1378 current revisions). Under certain timing circumstances, a data
1379 cache line maintenance operation by MVA targeting an Inner
1380 Shareable memory region may fail to proceed up to either the
1381 Point of Coherency or to the Point of Unification of the
1382 system. This workaround adds a DSB instruction before the
1383 relevant cache maintenance functions and sets a specific bit
1384 in the diagnostic control register of the SCU.
1386 config PL310_ERRATA_769419
1387 bool "PL310 errata: no automatic Store Buffer drain"
1388 depends on CACHE_L2X0
1390 On revisions of the PL310 prior to r3p2, the Store Buffer does
1391 not automatically drain. This can cause normal, non-cacheable
1392 writes to be retained when the memory system is idle, leading
1393 to suboptimal I/O performance for drivers using coherent DMA.
1394 This option adds a write barrier to the cpu_idle loop so that,
1395 on systems with an outer cache, the store buffer is drained
1400 source "arch/arm/common/Kconfig"
1410 Find out whether you have ISA slots on your motherboard. ISA is the
1411 name of a bus system, i.e. the way the CPU talks to the other stuff
1412 inside your box. Other bus systems are PCI, EISA, MicroChannel
1413 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1414 newer boards don't support it. If you have ISA, say Y, otherwise N.
1416 # Select ISA DMA controller support
1421 # Select ISA DMA interface
1426 bool "PCI support" if MIGHT_HAVE_PCI
1428 Find out whether you have a PCI motherboard. PCI is the name of a
1429 bus system, i.e. the way the CPU talks to the other stuff inside
1430 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1431 VESA. If you have PCI, say Y, otherwise N.
1437 config PCI_NANOENGINE
1438 bool "BSE nanoEngine PCI support"
1439 depends on SA1100_NANOENGINE
1441 Enable PCI on the BSE nanoEngine board.
1446 # Select the host bridge type
1447 config PCI_HOST_VIA82C505
1449 depends on PCI && ARCH_SHARK
1452 config PCI_HOST_ITE8152
1454 depends on PCI && MACH_ARMCORE
1458 source "drivers/pci/Kconfig"
1460 source "drivers/pcmcia/Kconfig"
1464 menu "Kernel Features"
1466 source "kernel/time/Kconfig"
1471 This option should be selected by machines which have an SMP-
1474 The only effect of this option is to make the SMP-related
1475 options available to the user for configuration.
1478 bool "Symmetric Multi-Processing"
1479 depends on CPU_V6K || CPU_V7
1480 depends on GENERIC_CLOCKEVENTS
1483 select USE_GENERIC_SMP_HELPERS
1484 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1486 This enables support for systems with more than one CPU. If you have
1487 a system with only one CPU, like most personal computers, say N. If
1488 you have a system with more than one CPU, say Y.
1490 If you say N here, the kernel will run on single and multiprocessor
1491 machines, but will use only one CPU of a multiprocessor machine. If
1492 you say Y here, the kernel will run on many, but not all, single
1493 processor machines. On a single processor machine, the kernel will
1494 run faster if you say N here.
1496 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1497 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1498 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1500 If you don't know what to do here, say N.
1503 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1504 depends on EXPERIMENTAL
1505 depends on SMP && !XIP_KERNEL
1508 SMP kernels contain instructions which fail on non-SMP processors.
1509 Enabling this option allows the kernel to modify itself to make
1510 these instructions safe. Disabling it allows about 1K of space
1513 If you don't know what to do here, say Y.
1515 config ARM_CPU_TOPOLOGY
1516 bool "Support cpu topology definition"
1517 depends on SMP && CPU_V7
1520 Support ARM cpu topology definition. The MPIDR register defines
1521 affinity between processors which is then used to describe the cpu
1522 topology of an ARM System.
1525 bool "Multi-core scheduler support"
1526 depends on ARM_CPU_TOPOLOGY
1528 Multi-core scheduler support improves the CPU scheduler's decision
1529 making when dealing with multi-core CPU chips at a cost of slightly
1530 increased overhead in some places. If unsure say N here.
1533 bool "SMT scheduler support"
1534 depends on ARM_CPU_TOPOLOGY
1536 Improves the CPU scheduler's decision making when dealing with
1537 MultiThreading at a cost of slightly increased overhead in some
1538 places. If unsure say N here.
1543 This option enables support for the ARM system coherency unit
1550 This options enables support for the ARM timer and watchdog unit
1553 prompt "Memory split"
1556 Select the desired split between kernel and user memory.
1558 If you are not absolutely sure what you are doing, leave this
1562 bool "3G/1G user/kernel split"
1564 bool "2G/2G user/kernel split"
1566 bool "1G/3G user/kernel split"
1571 default 0x40000000 if VMSPLIT_1G
1572 default 0x80000000 if VMSPLIT_2G
1576 int "Maximum number of CPUs (2-32)"
1582 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1583 depends on SMP && HOTPLUG && EXPERIMENTAL
1585 Say Y here to experiment with turning CPUs off and on. CPUs
1586 can be controlled through /sys/devices/system/cpu.
1589 bool "Use local timer interrupts"
1592 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1594 Enable support for local timers on SMP platforms, rather then the
1595 legacy IPI broadcast method. Local timers allows the system
1596 accounting to be spread across the timer interval, preventing a
1597 "thundering herd" at every timer tick.
1601 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1602 default 355 if ARCH_U8500
1603 default 264 if MACH_H4700
1606 Maximum number of GPIOs in the system.
1608 If unsure, leave the default value.
1610 source kernel/Kconfig.preempt
1614 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1615 ARCH_S5PV210 || ARCH_EXYNOS4
1616 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1617 default AT91_TIMER_HZ if ARCH_AT91
1618 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1621 config THUMB2_KERNEL
1622 bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
1623 depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
1625 select ARM_ASM_UNIFIED
1628 By enabling this option, the kernel will be compiled in
1629 Thumb-2 mode. A compiler/assembler that understand the unified
1630 ARM-Thumb syntax is needed.
1634 config THUMB2_AVOID_R_ARM_THM_JUMP11
1635 bool "Work around buggy Thumb-2 short branch relocations in gas"
1636 depends on THUMB2_KERNEL && MODULES
1639 Various binutils versions can resolve Thumb-2 branches to
1640 locally-defined, preemptible global symbols as short-range "b.n"
1641 branch instructions.
1643 This is a problem, because there's no guarantee the final
1644 destination of the symbol, or any candidate locations for a
1645 trampoline, are within range of the branch. For this reason, the
1646 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1647 relocation in modules at all, and it makes little sense to add
1650 The symptom is that the kernel fails with an "unsupported
1651 relocation" error when loading some modules.
1653 Until fixed tools are available, passing
1654 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1655 code which hits this problem, at the cost of a bit of extra runtime
1656 stack usage in some cases.
1658 The problem is described in more detail at:
1659 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1661 Only Thumb-2 kernels are affected.
1663 Unless you are sure your tools don't have this problem, say Y.
1665 config ARM_ASM_UNIFIED
1669 bool "Use the ARM EABI to compile the kernel"
1671 This option allows for the kernel to be compiled using the latest
1672 ARM ABI (aka EABI). This is only useful if you are using a user
1673 space environment that is also compiled with EABI.
1675 Since there are major incompatibilities between the legacy ABI and
1676 EABI, especially with regard to structure member alignment, this
1677 option also changes the kernel syscall calling convention to
1678 disambiguate both ABIs and allow for backward compatibility support
1679 (selected with CONFIG_OABI_COMPAT).
1681 To use this you need GCC version 4.0.0 or later.
1684 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1685 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1688 This option preserves the old syscall interface along with the
1689 new (ARM EABI) one. It also provides a compatibility layer to
1690 intercept syscalls that have structure arguments which layout
1691 in memory differs between the legacy ABI and the new ARM EABI
1692 (only for non "thumb" binaries). This option adds a tiny
1693 overhead to all syscalls and produces a slightly larger kernel.
1694 If you know you'll be using only pure EABI user space then you
1695 can say N here. If this option is not selected and you attempt
1696 to execute a legacy ABI binary then the result will be
1697 UNPREDICTABLE (in fact it can be predicted that it won't work
1698 at all). If in doubt say Y.
1700 config ARCH_HAS_HOLES_MEMORYMODEL
1703 config ARCH_SPARSEMEM_ENABLE
1706 config ARCH_SPARSEMEM_DEFAULT
1707 def_bool ARCH_SPARSEMEM_ENABLE
1709 config ARCH_SELECT_MEMORY_MODEL
1710 def_bool ARCH_SPARSEMEM_ENABLE
1712 config HAVE_ARCH_PFN_VALID
1713 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1716 bool "High Memory Support"
1719 The address space of ARM processors is only 4 Gigabytes large
1720 and it has to accommodate user address space, kernel address
1721 space as well as some memory mapped IO. That means that, if you
1722 have a large amount of physical memory and/or IO, not all of the
1723 memory can be "permanently mapped" by the kernel. The physical
1724 memory that is not permanently mapped is called "high memory".
1726 Depending on the selected kernel/user memory split, minimum
1727 vmalloc space and actual amount of RAM, you may not need this
1728 option which should result in a slightly faster kernel.
1733 bool "Allocate 2nd-level pagetables from highmem"
1736 config HW_PERF_EVENTS
1737 bool "Enable hardware performance counter support for perf events"
1738 depends on PERF_EVENTS && CPU_HAS_PMU
1741 Enable hardware performance counter support for perf events. If
1742 disabled, perf events will use software events only.
1746 config FORCE_MAX_ZONEORDER
1747 int "Maximum zone order" if ARCH_SHMOBILE
1748 range 11 64 if ARCH_SHMOBILE
1749 default "9" if SA1111
1752 The kernel memory allocator divides physically contiguous memory
1753 blocks into "zones", where each zone is a power of two number of
1754 pages. This option selects the largest power of two that the kernel
1755 keeps in the memory allocator. If you need to allocate very large
1756 blocks of physically contiguous memory, then you may need to
1757 increase this value.
1759 This config option is actually maximum order plus one. For example,
1760 a value of 11 means that the largest free memory block is 2^10 pages.
1763 bool "Timer and CPU usage LEDs"
1764 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1765 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1766 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1767 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1768 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1769 ARCH_AT91 || ARCH_DAVINCI || \
1770 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1772 If you say Y here, the LEDs on your machine will be used
1773 to provide useful information about your current system status.
1775 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1776 be able to select which LEDs are active using the options below. If
1777 you are compiling a kernel for the EBSA-110 or the LART however, the
1778 red LED will simply flash regularly to indicate that the system is
1779 still functional. It is safe to say Y here if you have a CATS
1780 system, but the driver will do nothing.
1783 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1784 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1785 || MACH_OMAP_PERSEUS2
1787 depends on !GENERIC_CLOCKEVENTS
1788 default y if ARCH_EBSA110
1790 If you say Y here, one of the system LEDs (the green one on the
1791 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1792 will flash regularly to indicate that the system is still
1793 operational. This is mainly useful to kernel hackers who are
1794 debugging unstable kernels.
1796 The LART uses the same LED for both Timer LED and CPU usage LED
1797 functions. You may choose to use both, but the Timer LED function
1798 will overrule the CPU usage LED.
1801 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1803 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1804 || MACH_OMAP_PERSEUS2
1807 If you say Y here, the red LED will be used to give a good real
1808 time indication of CPU usage, by lighting whenever the idle task
1809 is not currently executing.
1811 The LART uses the same LED for both Timer LED and CPU usage LED
1812 functions. You may choose to use both, but the Timer LED function
1813 will overrule the CPU usage LED.
1815 config ALIGNMENT_TRAP
1817 depends on CPU_CP15_MMU
1818 default y if !ARCH_EBSA110
1819 select HAVE_PROC_CPU if PROC_FS
1821 ARM processors cannot fetch/store information which is not
1822 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1823 address divisible by 4. On 32-bit ARM processors, these non-aligned
1824 fetch/store instructions will be emulated in software if you say
1825 here, which has a severe performance impact. This is necessary for
1826 correct operation of some network protocols. With an IP-only
1827 configuration it is safe to say N, otherwise say Y.
1829 config UACCESS_WITH_MEMCPY
1830 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1831 depends on MMU && EXPERIMENTAL
1832 default y if CPU_FEROCEON
1834 Implement faster copy_to_user and clear_user methods for CPU
1835 cores where a 8-word STM instruction give significantly higher
1836 memory write throughput than a sequence of individual 32bit stores.
1838 A possible side effect is a slight increase in scheduling latency
1839 between threads sharing the same address space if they invoke
1840 such copy operations with large buffers.
1842 However, if the CPU data cache is using a write-allocate mode,
1843 this option is unlikely to provide any performance gain.
1847 prompt "Enable seccomp to safely compute untrusted bytecode"
1849 This kernel feature is useful for number crunching applications
1850 that may need to compute untrusted bytecode during their
1851 execution. By using pipes or other transports made available to
1852 the process as file descriptors supporting the read/write
1853 syscalls, it's possible to isolate those applications in
1854 their own address space using seccomp. Once seccomp is
1855 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1856 and the task is only allowed to execute a few safe syscalls
1857 defined by each seccomp mode.
1859 config CC_STACKPROTECTOR
1860 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1861 depends on EXPERIMENTAL
1863 This option turns on the -fstack-protector GCC feature. This
1864 feature puts, at the beginning of functions, a canary value on
1865 the stack just before the return address, and validates
1866 the value just before actually returning. Stack based buffer
1867 overflows (that need to overwrite this return address) now also
1868 overwrite the canary, which gets detected and the attack is then
1869 neutralized via a kernel panic.
1870 This feature requires gcc version 4.2 or above.
1872 config DEPRECATED_PARAM_STRUCT
1873 bool "Provide old way to pass kernel parameters"
1875 This was deprecated in 2001 and announced to live on for 5 years.
1876 Some old boot loaders still use this way.
1883 bool "Flattened Device Tree support"
1885 select OF_EARLY_FLATTREE
1888 Include support for flattened device tree machine descriptions.
1890 # Compressed boot loader in ROM. Yes, we really want to ask about
1891 # TEXT and BSS so we preserve their values in the config files.
1892 config ZBOOT_ROM_TEXT
1893 hex "Compressed ROM boot loader base address"
1896 The physical address at which the ROM-able zImage is to be
1897 placed in the target. Platforms which normally make use of
1898 ROM-able zImage formats normally set this to a suitable
1899 value in their defconfig file.
1901 If ZBOOT_ROM is not enabled, this has no effect.
1903 config ZBOOT_ROM_BSS
1904 hex "Compressed ROM boot loader BSS address"
1907 The base address of an area of read/write memory in the target
1908 for the ROM-able zImage which must be available while the
1909 decompressor is running. It must be large enough to hold the
1910 entire decompressed kernel plus an additional 128 KiB.
1911 Platforms which normally make use of ROM-able zImage formats
1912 normally set this to a suitable value in their defconfig file.
1914 If ZBOOT_ROM is not enabled, this has no effect.
1917 bool "Compressed boot loader in ROM/flash"
1918 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1920 Say Y here if you intend to execute your compressed kernel image
1921 (zImage) directly from ROM or flash. If unsure, say N.
1924 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1925 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1926 default ZBOOT_ROM_NONE
1928 Include experimental SD/MMC loading code in the ROM-able zImage.
1929 With this enabled it is possible to write the the ROM-able zImage
1930 kernel image to an MMC or SD card and boot the kernel straight
1931 from the reset vector. At reset the processor Mask ROM will load
1932 the first part of the the ROM-able zImage which in turn loads the
1933 rest the kernel image to RAM.
1935 config ZBOOT_ROM_NONE
1936 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1938 Do not load image from SD or MMC
1940 config ZBOOT_ROM_MMCIF
1941 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1943 Load image from MMCIF hardware block.
1945 config ZBOOT_ROM_SH_MOBILE_SDHI
1946 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1948 Load image from SDHI hardware block
1952 config ARM_APPENDED_DTB
1953 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1954 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1956 With this option, the boot code will look for a device tree binary
1957 (DTB) appended to zImage
1958 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1960 This is meant as a backward compatibility convenience for those
1961 systems with a bootloader that can't be upgraded to accommodate
1962 the documented boot protocol using a device tree.
1964 Beware that there is very little in terms of protection against
1965 this option being confused by leftover garbage in memory that might
1966 look like a DTB header after a reboot if no actual DTB is appended
1967 to zImage. Do not leave this option active in a production kernel
1968 if you don't intend to always append a DTB. Proper passing of the
1969 location into r2 of a bootloader provided DTB is always preferable
1972 config ARM_ATAG_DTB_COMPAT
1973 bool "Supplement the appended DTB with traditional ATAG information"
1974 depends on ARM_APPENDED_DTB
1976 Some old bootloaders can't be updated to a DTB capable one, yet
1977 they provide ATAGs with memory configuration, the ramdisk address,
1978 the kernel cmdline string, etc. Such information is dynamically
1979 provided by the bootloader and can't always be stored in a static
1980 DTB. To allow a device tree enabled kernel to be used with such
1981 bootloaders, this option allows zImage to extract the information
1982 from the ATAG list and store it at run time into the appended DTB.
1985 string "Default kernel command string"
1988 On some architectures (EBSA110 and CATS), there is currently no way
1989 for the boot loader to pass arguments to the kernel. For these
1990 architectures, you should supply some command-line options at build
1991 time by entering them here. As a minimum, you should specify the
1992 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1995 prompt "Kernel command line type" if CMDLINE != ""
1996 default CMDLINE_FROM_BOOTLOADER
1998 config CMDLINE_FROM_BOOTLOADER
1999 bool "Use bootloader kernel arguments if available"
2001 Uses the command-line options passed by the boot loader. If
2002 the boot loader doesn't provide any, the default kernel command
2003 string provided in CMDLINE will be used.
2005 config CMDLINE_EXTEND
2006 bool "Extend bootloader kernel arguments"
2008 The command-line arguments provided by the boot loader will be
2009 appended to the default kernel command string.
2011 config CMDLINE_FORCE
2012 bool "Always use the default kernel command string"
2014 Always use the default kernel command string, even if the boot
2015 loader passes other arguments to the kernel.
2016 This is useful if you cannot or don't want to change the
2017 command-line options your boot loader passes to the kernel.
2021 bool "Kernel Execute-In-Place from ROM"
2022 depends on !ZBOOT_ROM && !ARM_LPAE
2024 Execute-In-Place allows the kernel to run from non-volatile storage
2025 directly addressable by the CPU, such as NOR flash. This saves RAM
2026 space since the text section of the kernel is not loaded from flash
2027 to RAM. Read-write sections, such as the data section and stack,
2028 are still copied to RAM. The XIP kernel is not compressed since
2029 it has to run directly from flash, so it will take more space to
2030 store it. The flash address used to link the kernel object files,
2031 and for storing it, is configuration dependent. Therefore, if you
2032 say Y here, you must know the proper physical address where to
2033 store the kernel image depending on your own flash memory usage.
2035 Also note that the make target becomes "make xipImage" rather than
2036 "make zImage" or "make Image". The final kernel binary to put in
2037 ROM memory will be arch/arm/boot/xipImage.
2041 config XIP_PHYS_ADDR
2042 hex "XIP Kernel Physical Location"
2043 depends on XIP_KERNEL
2044 default "0x00080000"
2046 This is the physical address in your flash memory the kernel will
2047 be linked for and stored to. This address is dependent on your
2051 bool "Kexec system call (EXPERIMENTAL)"
2052 depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
2054 kexec is a system call that implements the ability to shutdown your
2055 current kernel, and to start another kernel. It is like a reboot
2056 but it is independent of the system firmware. And like a reboot
2057 you can start any kernel with it, not just Linux.
2059 It is an ongoing process to be certain the hardware in a machine
2060 is properly shutdown, so do not be surprised if this code does not
2061 initially work for you. It may help to enable device hotplugging
2065 bool "Export atags in procfs"
2069 Should the atags used to boot the kernel be exported in an "atags"
2070 file in procfs. Useful with kexec.
2073 bool "Build kdump crash kernel (EXPERIMENTAL)"
2074 depends on EXPERIMENTAL
2076 Generate crash dump after being started by kexec. This should
2077 be normally only set in special crash dump kernels which are
2078 loaded in the main kernel with kexec-tools into a specially
2079 reserved region and then later executed after a crash by
2080 kdump/kexec. The crash dump kernel must be compiled to a
2081 memory address not used by the main kernel
2083 For more details see Documentation/kdump/kdump.txt
2085 config AUTO_ZRELADDR
2086 bool "Auto calculation of the decompressed kernel image address"
2087 depends on !ZBOOT_ROM && !ARCH_U300
2089 ZRELADDR is the physical address where the decompressed kernel
2090 image will be placed. If AUTO_ZRELADDR is selected, the address
2091 will be determined at run-time by masking the current IP with
2092 0xf8000000. This assumes the zImage being placed in the first 128MB
2093 from start of memory.
2097 menu "CPU Power Management"
2101 source "drivers/cpufreq/Kconfig"
2104 tristate "CPUfreq driver for i.MX CPUs"
2105 depends on ARCH_MXC && CPU_FREQ
2107 This enables the CPUfreq driver for i.MX CPUs.
2109 config CPU_FREQ_SA1100
2112 config CPU_FREQ_SA1110
2115 config CPU_FREQ_INTEGRATOR
2116 tristate "CPUfreq driver for ARM Integrator CPUs"
2117 depends on ARCH_INTEGRATOR && CPU_FREQ
2120 This enables the CPUfreq driver for ARM Integrator CPUs.
2122 For details, take a look at <file:Documentation/cpu-freq>.
2128 depends on CPU_FREQ && ARCH_PXA && PXA25x
2130 select CPU_FREQ_TABLE
2131 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2136 Internal configuration node for common cpufreq on Samsung SoC
2138 config CPU_FREQ_S3C24XX
2139 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2140 depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
2143 This enables the CPUfreq driver for the Samsung S3C24XX family
2146 For details, take a look at <file:Documentation/cpu-freq>.
2150 config CPU_FREQ_S3C24XX_PLL
2151 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2152 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2154 Compile in support for changing the PLL frequency from the
2155 S3C24XX series CPUfreq driver. The PLL takes time to settle
2156 after a frequency change, so by default it is not enabled.
2158 This also means that the PLL tables for the selected CPU(s) will
2159 be built which may increase the size of the kernel image.
2161 config CPU_FREQ_S3C24XX_DEBUG
2162 bool "Debug CPUfreq Samsung driver core"
2163 depends on CPU_FREQ_S3C24XX
2165 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2167 config CPU_FREQ_S3C24XX_IODEBUG
2168 bool "Debug CPUfreq Samsung driver IO timing"
2169 depends on CPU_FREQ_S3C24XX
2171 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2173 config CPU_FREQ_S3C24XX_DEBUGFS
2174 bool "Export debugfs for CPUFreq"
2175 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2177 Export status information via debugfs.
2181 source "drivers/cpuidle/Kconfig"
2185 menu "Floating point emulation"
2187 comment "At least one emulation must be selected"
2190 bool "NWFPE math emulation"
2191 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2193 Say Y to include the NWFPE floating point emulator in the kernel.
2194 This is necessary to run most binaries. Linux does not currently
2195 support floating point hardware so you need to say Y here even if
2196 your machine has an FPA or floating point co-processor podule.
2198 You may say N here if you are going to load the Acorn FPEmulator
2199 early in the bootup.
2202 bool "Support extended precision"
2203 depends on FPE_NWFPE
2205 Say Y to include 80-bit support in the kernel floating-point
2206 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2207 Note that gcc does not generate 80-bit operations by default,
2208 so in most cases this option only enlarges the size of the
2209 floating point emulator without any good reason.
2211 You almost surely want to say N here.
2214 bool "FastFPE math emulation (EXPERIMENTAL)"
2215 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2217 Say Y here to include the FAST floating point emulator in the kernel.
2218 This is an experimental much faster emulator which now also has full
2219 precision for the mantissa. It does not support any exceptions.
2220 It is very simple, and approximately 3-6 times faster than NWFPE.
2222 It should be sufficient for most programs. It may be not suitable
2223 for scientific calculations, but you have to check this for yourself.
2224 If you do not feel you need a faster FP emulation you should better
2228 bool "VFP-format floating point maths"
2229 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2231 Say Y to include VFP support code in the kernel. This is needed
2232 if your hardware includes a VFP unit.
2234 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2235 release notes and additional status information.
2237 Say N if your target does not have VFP hardware.
2245 bool "Advanced SIMD (NEON) Extension support"
2246 depends on VFPv3 && CPU_V7
2248 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2253 menu "Userspace binary formats"
2255 source "fs/Kconfig.binfmt"
2258 tristate "RISC OS personality"
2261 Say Y here to include the kernel code necessary if you want to run
2262 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2263 experimental; if this sounds frightening, say N and sleep in peace.
2264 You can also say M here to compile this support as a module (which
2265 will be called arthur).
2269 menu "Power management options"
2271 source "kernel/power/Kconfig"
2273 config ARCH_SUSPEND_POSSIBLE
2274 depends on !ARCH_S5PC100
2275 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2276 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
2279 config ARM_CPU_SUSPEND
2284 source "net/Kconfig"
2286 source "drivers/Kconfig"
2290 source "arch/arm/Kconfig.debug"
2292 source "security/Kconfig"
2294 source "crypto/Kconfig"
2296 source "lib/Kconfig"