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)
13 select HAVE_KPROBES if !XIP_KERNEL
14 select HAVE_KRETPROBES if (HAVE_KPROBES)
15 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
16 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
17 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
18 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
19 select HAVE_GENERIC_DMA_COHERENT
20 select HAVE_KERNEL_GZIP
21 select HAVE_KERNEL_LZO
22 select HAVE_KERNEL_LZMA
24 select HAVE_PERF_EVENTS
25 select PERF_USE_VMALLOC
26 select HAVE_REGS_AND_STACK_ACCESS_API
27 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
28 select HAVE_C_RECORDMCOUNT
29 select HAVE_GENERIC_HARDIRQS
30 select HAVE_SPARSE_IRQ
31 select GENERIC_IRQ_SHOW
32 select CPU_PM if (SUSPEND || CPU_IDLE)
34 The ARM series is a line of low-power-consumption RISC chip designs
35 licensed by ARM Ltd and targeted at embedded applications and
36 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
37 manufactured, but legacy ARM-based PC hardware remains popular in
38 Europe. There is an ARM Linux project with a web page at
39 <http://www.arm.linux.org.uk/>.
41 config ARM_HAS_SG_CHAIN
50 config SYS_SUPPORTS_APM_EMULATION
53 config HAVE_SCHED_CLOCK
59 config ARCH_USES_GETTIMEOFFSET
63 config GENERIC_CLOCKEVENTS
66 config GENERIC_CLOCKEVENTS_BROADCAST
68 depends on GENERIC_CLOCKEVENTS
77 select GENERIC_ALLOCATOR
88 The Extended Industry Standard Architecture (EISA) bus was
89 developed as an open alternative to the IBM MicroChannel bus.
91 The EISA bus provided some of the features of the IBM MicroChannel
92 bus while maintaining backward compatibility with cards made for
93 the older ISA bus. The EISA bus saw limited use between 1988 and
94 1995 when it was made obsolete by the PCI bus.
96 Say Y here if you are building a kernel for an EISA-based machine.
106 MicroChannel Architecture is found in some IBM PS/2 machines and
107 laptops. It is a bus system similar to PCI or ISA. See
108 <file:Documentation/mca.txt> (and especially the web page given
109 there) before attempting to build an MCA bus kernel.
111 config STACKTRACE_SUPPORT
115 config HAVE_LATENCYTOP_SUPPORT
120 config LOCKDEP_SUPPORT
124 config TRACE_IRQFLAGS_SUPPORT
128 config HARDIRQS_SW_RESEND
132 config GENERIC_IRQ_PROBE
136 config GENERIC_LOCKBREAK
139 depends on SMP && PREEMPT
141 config RWSEM_GENERIC_SPINLOCK
145 config RWSEM_XCHGADD_ALGORITHM
148 config ARCH_HAS_ILOG2_U32
151 config ARCH_HAS_ILOG2_U64
154 config ARCH_HAS_CPUFREQ
157 Internal node to signify that the ARCH has CPUFREQ support
158 and that the relevant menu configurations are displayed for
161 config ARCH_HAS_CPU_IDLE_WAIT
164 config GENERIC_HWEIGHT
168 config GENERIC_CALIBRATE_DELAY
172 config ARCH_MAY_HAVE_PC_FDC
178 config NEED_DMA_MAP_STATE
181 config GENERIC_ISA_DMA
192 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
193 default DRAM_BASE if REMAP_VECTORS_TO_RAM
196 The base address of exception vectors.
198 config ARM_PATCH_PHYS_VIRT
199 bool "Patch physical to virtual translations at runtime" if EMBEDDED
201 depends on !XIP_KERNEL && MMU
202 depends on !ARCH_REALVIEW || !SPARSEMEM
204 Patch phys-to-virt and virt-to-phys translation functions at
205 boot and module load time according to the position of the
206 kernel in system memory.
208 This can only be used with non-XIP MMU kernels where the base
209 of physical memory is at a 16MB boundary.
211 Only disable this option if you know that you do not require
212 this feature (eg, building a kernel for a single machine) and
213 you need to shrink the kernel to the minimal size.
215 config NEED_MACH_MEMORY_H
218 Select this when mach/memory.h is required to provide special
219 definitions for this platform. The need for mach/memory.h should
220 be avoided when possible.
223 hex "Physical address of main memory"
224 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
226 Please provide the physical address corresponding to the
227 location of main memory in your system.
233 source "init/Kconfig"
235 source "kernel/Kconfig.freezer"
240 bool "MMU-based Paged Memory Management Support"
243 Select if you want MMU-based virtualised addressing space
244 support by paged memory management. If unsure, say 'Y'.
247 # The "ARM system type" choice list is ordered alphabetically by option
248 # text. Please add new entries in the option alphabetic order.
251 prompt "ARM system type"
252 default ARCH_VERSATILE
254 config ARCH_INTEGRATOR
255 bool "ARM Ltd. Integrator family"
257 select ARCH_HAS_CPUFREQ
259 select HAVE_MACH_CLKDEV
261 select GENERIC_CLOCKEVENTS
262 select PLAT_VERSATILE
263 select PLAT_VERSATILE_FPGA_IRQ
264 select NEED_MACH_MEMORY_H
266 Support for ARM's Integrator platform.
269 bool "ARM Ltd. RealView family"
272 select HAVE_MACH_CLKDEV
274 select GENERIC_CLOCKEVENTS
275 select ARCH_WANT_OPTIONAL_GPIOLIB
276 select PLAT_VERSATILE
277 select PLAT_VERSATILE_CLCD
278 select ARM_TIMER_SP804
279 select GPIO_PL061 if GPIOLIB
280 select NEED_MACH_MEMORY_H
282 This enables support for ARM Ltd RealView boards.
284 config ARCH_VERSATILE
285 bool "ARM Ltd. Versatile family"
289 select HAVE_MACH_CLKDEV
291 select GENERIC_CLOCKEVENTS
292 select ARCH_WANT_OPTIONAL_GPIOLIB
293 select PLAT_VERSATILE
294 select PLAT_VERSATILE_CLCD
295 select PLAT_VERSATILE_FPGA_IRQ
296 select ARM_TIMER_SP804
298 This enables support for ARM Ltd Versatile board.
301 bool "ARM Ltd. Versatile Express family"
302 select ARCH_WANT_OPTIONAL_GPIOLIB
304 select ARM_TIMER_SP804
306 select HAVE_MACH_CLKDEV
307 select GENERIC_CLOCKEVENTS
309 select HAVE_PATA_PLATFORM
311 select PLAT_VERSATILE
312 select PLAT_VERSATILE_CLCD
314 This enables support for the ARM Ltd Versatile Express boards.
318 select ARCH_REQUIRE_GPIOLIB
322 This enables support for systems based on the Atmel AT91RM9200,
323 AT91SAM9 and AT91CAP9 processors.
326 bool "Broadcom BCMRING"
330 select ARM_TIMER_SP804
332 select GENERIC_CLOCKEVENTS
333 select ARCH_WANT_OPTIONAL_GPIOLIB
335 Support for Broadcom's BCMRing platform.
338 bool "Calxeda Highbank-based"
339 select ARCH_WANT_OPTIONAL_GPIOLIB
342 select ARM_TIMER_SP804
345 select GENERIC_CLOCKEVENTS
349 Support for the Calxeda Highbank SoC based boards.
352 bool "Cirrus Logic CLPS711x/EP721x-based"
354 select ARCH_USES_GETTIMEOFFSET
355 select NEED_MACH_MEMORY_H
357 Support for Cirrus Logic 711x/721x based boards.
360 bool "Cavium Networks CNS3XXX family"
362 select GENERIC_CLOCKEVENTS
364 select MIGHT_HAVE_PCI
365 select PCI_DOMAINS if PCI
367 Support for Cavium Networks CNS3XXX platform.
370 bool "Cortina Systems Gemini"
372 select ARCH_REQUIRE_GPIOLIB
373 select ARCH_USES_GETTIMEOFFSET
375 Support for the Cortina Systems Gemini family SoCs
378 bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
381 select GENERIC_CLOCKEVENTS
383 select GENERIC_IRQ_CHIP
387 Support for CSR SiRFSoC ARM Cortex A9 Platform
394 select ARCH_USES_GETTIMEOFFSET
395 select NEED_MACH_MEMORY_H
397 This is an evaluation board for the StrongARM processor available
398 from Digital. It has limited hardware on-board, including an
399 Ethernet interface, two PCMCIA sockets, two serial ports and a
408 select ARCH_REQUIRE_GPIOLIB
409 select ARCH_HAS_HOLES_MEMORYMODEL
410 select ARCH_USES_GETTIMEOFFSET
411 select NEED_MACH_MEMORY_H
412 select MULTI_IRQ_HANDLER
414 This enables support for the Cirrus EP93xx series of CPUs.
416 config ARCH_FOOTBRIDGE
420 select GENERIC_CLOCKEVENTS
422 select NEED_MACH_MEMORY_H
424 Support for systems based on the DC21285 companion chip
425 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
428 bool "Freescale MXC/iMX-based"
429 select GENERIC_CLOCKEVENTS
430 select ARCH_REQUIRE_GPIOLIB
433 select GENERIC_IRQ_CHIP
434 select HAVE_SCHED_CLOCK
435 select MULTI_IRQ_HANDLER
437 Support for Freescale MXC/iMX-based family of processors
440 bool "Freescale MXS-based"
441 select GENERIC_CLOCKEVENTS
442 select ARCH_REQUIRE_GPIOLIB
446 Support for Freescale MXS-based family of processors
449 bool "Hilscher NetX based"
453 select GENERIC_CLOCKEVENTS
454 select MULTI_IRQ_HANDLER
456 This enables support for systems based on the Hilscher NetX Soc
459 bool "Hynix HMS720x-based"
462 select ARCH_USES_GETTIMEOFFSET
464 This enables support for systems based on the Hynix HMS720x
472 select ARCH_SUPPORTS_MSI
474 select NEED_MACH_MEMORY_H
476 Support for Intel's IOP13XX (XScale) family of processors.
484 select ARCH_REQUIRE_GPIOLIB
486 Support for Intel's 80219 and IOP32X (XScale) family of
495 select ARCH_REQUIRE_GPIOLIB
497 Support for Intel's IOP33X (XScale) family of processors.
504 select ARCH_USES_GETTIMEOFFSET
505 select NEED_MACH_MEMORY_H
507 Support for Intel's IXP23xx (XScale) family of processors.
510 bool "IXP2400/2800-based"
514 select ARCH_USES_GETTIMEOFFSET
515 select NEED_MACH_MEMORY_H
517 Support for Intel's IXP2400/2800 (XScale) family of processors.
525 select GENERIC_CLOCKEVENTS
526 select HAVE_SCHED_CLOCK
527 select MIGHT_HAVE_PCI
528 select DMABOUNCE if PCI
530 Support for Intel's IXP4XX (XScale) family of processors.
536 select ARCH_REQUIRE_GPIOLIB
537 select GENERIC_CLOCKEVENTS
540 Support for the Marvell Dove SoC 88AP510
543 bool "Marvell Kirkwood"
546 select ARCH_REQUIRE_GPIOLIB
547 select GENERIC_CLOCKEVENTS
550 Support for the following Marvell Kirkwood series SoCs:
551 88F6180, 88F6192 and 88F6281.
557 select ARCH_REQUIRE_GPIOLIB
560 select USB_ARCH_HAS_OHCI
562 select GENERIC_CLOCKEVENTS
564 Support for the NXP LPC32XX family of processors
567 bool "Marvell MV78xx0"
570 select ARCH_REQUIRE_GPIOLIB
571 select GENERIC_CLOCKEVENTS
574 Support for the following Marvell MV78xx0 series SoCs:
582 select ARCH_REQUIRE_GPIOLIB
583 select GENERIC_CLOCKEVENTS
586 Support for the following Marvell Orion 5x series SoCs:
587 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
588 Orion-2 (5281), Orion-1-90 (6183).
591 bool "Marvell PXA168/910/MMP2"
593 select ARCH_REQUIRE_GPIOLIB
595 select GENERIC_CLOCKEVENTS
596 select HAVE_SCHED_CLOCK
600 select GENERIC_ALLOCATOR
602 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
605 bool "Micrel/Kendin KS8695"
607 select ARCH_REQUIRE_GPIOLIB
608 select ARCH_USES_GETTIMEOFFSET
609 select NEED_MACH_MEMORY_H
611 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
612 System-on-Chip devices.
615 bool "Nuvoton W90X900 CPU"
617 select ARCH_REQUIRE_GPIOLIB
620 select GENERIC_CLOCKEVENTS
622 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
623 At present, the w90x900 has been renamed nuc900, regarding
624 the ARM series product line, you can login the following
625 link address to know more.
627 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
628 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
634 select GENERIC_CLOCKEVENTS
637 select HAVE_SCHED_CLOCK
638 select ARCH_HAS_CPUFREQ
640 This enables support for NVIDIA Tegra based systems (Tegra APX,
641 Tegra 6xx and Tegra 2 series).
643 config ARCH_PICOXCELL
644 bool "Picochip picoXcell"
645 select ARCH_REQUIRE_GPIOLIB
646 select ARM_PATCH_PHYS_VIRT
650 select GENERIC_CLOCKEVENTS
652 select HAVE_SCHED_CLOCK
657 This enables support for systems based on the Picochip picoXcell
658 family of Femtocell devices. The picoxcell support requires device tree
662 bool "Philips Nexperia PNX4008 Mobile"
665 select ARCH_USES_GETTIMEOFFSET
667 This enables support for Philips PNX4008 mobile platform.
670 bool "PXA2xx/PXA3xx-based"
673 select ARCH_HAS_CPUFREQ
676 select ARCH_REQUIRE_GPIOLIB
677 select GENERIC_CLOCKEVENTS
678 select HAVE_SCHED_CLOCK
683 select MULTI_IRQ_HANDLER
684 select ARM_CPU_SUSPEND if PM
687 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
692 select GENERIC_CLOCKEVENTS
693 select ARCH_REQUIRE_GPIOLIB
696 Support for Qualcomm MSM/QSD based systems. This runs on the
697 apps processor of the MSM/QSD and depends on a shared memory
698 interface to the modem processor which runs the baseband
699 stack and controls some vital subsystems
700 (clock and power control, etc).
703 bool "Renesas SH-Mobile / R-Mobile"
706 select HAVE_MACH_CLKDEV
707 select GENERIC_CLOCKEVENTS
710 select MULTI_IRQ_HANDLER
711 select PM_GENERIC_DOMAINS if PM
712 select NEED_MACH_MEMORY_H
714 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
721 select ARCH_MAY_HAVE_PC_FDC
722 select HAVE_PATA_PLATFORM
725 select ARCH_SPARSEMEM_ENABLE
726 select ARCH_USES_GETTIMEOFFSET
728 select NEED_MACH_MEMORY_H
730 On the Acorn Risc-PC, Linux can support the internal IDE disk and
731 CD-ROM interface, serial and parallel port, and the floppy drive.
738 select ARCH_SPARSEMEM_ENABLE
740 select ARCH_HAS_CPUFREQ
742 select GENERIC_CLOCKEVENTS
744 select HAVE_SCHED_CLOCK
746 select ARCH_REQUIRE_GPIOLIB
748 select NEED_MACH_MEMORY_H
750 Support for StrongARM 11x0 based boards.
753 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
755 select ARCH_HAS_CPUFREQ
758 select ARCH_USES_GETTIMEOFFSET
759 select HAVE_S3C2410_I2C if I2C
761 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
762 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
763 the Samsung SMDK2410 development board (and derivatives).
765 Note, the S3C2416 and the S3C2450 are so close that they even share
766 the same SoC ID code. This means that there is no separate machine
767 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
770 bool "Samsung S3C64XX"
778 select ARCH_USES_GETTIMEOFFSET
779 select ARCH_HAS_CPUFREQ
780 select ARCH_REQUIRE_GPIOLIB
781 select SAMSUNG_CLKSRC
782 select SAMSUNG_IRQ_VIC_TIMER
783 select S3C_GPIO_TRACK
785 select USB_ARCH_HAS_OHCI
786 select SAMSUNG_GPIOLIB_4BIT
787 select HAVE_S3C2410_I2C if I2C
788 select HAVE_S3C2410_WATCHDOG if WATCHDOG
790 Samsung S3C64XX series based systems
793 bool "Samsung S5P6440 S5P6450"
799 select HAVE_S3C2410_WATCHDOG if WATCHDOG
800 select GENERIC_CLOCKEVENTS
801 select HAVE_SCHED_CLOCK
802 select HAVE_S3C2410_I2C if I2C
803 select HAVE_S3C_RTC if RTC_CLASS
805 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
809 bool "Samsung S5PC100"
814 select ARM_L1_CACHE_SHIFT_6
815 select ARCH_USES_GETTIMEOFFSET
816 select HAVE_S3C2410_I2C if I2C
817 select HAVE_S3C_RTC if RTC_CLASS
818 select HAVE_S3C2410_WATCHDOG if WATCHDOG
820 Samsung S5PC100 series based systems
823 bool "Samsung S5PV210/S5PC110"
825 select ARCH_SPARSEMEM_ENABLE
826 select ARCH_HAS_HOLES_MEMORYMODEL
831 select ARM_L1_CACHE_SHIFT_6
832 select ARCH_HAS_CPUFREQ
833 select GENERIC_CLOCKEVENTS
834 select HAVE_SCHED_CLOCK
835 select HAVE_S3C2410_I2C if I2C
836 select HAVE_S3C_RTC if RTC_CLASS
837 select HAVE_S3C2410_WATCHDOG if WATCHDOG
838 select NEED_MACH_MEMORY_H
840 Samsung S5PV210/S5PC110 series based systems
843 bool "SAMSUNG EXYNOS"
845 select ARCH_SPARSEMEM_ENABLE
846 select ARCH_HAS_HOLES_MEMORYMODEL
850 select ARCH_HAS_CPUFREQ
851 select GENERIC_CLOCKEVENTS
852 select HAVE_S3C_RTC if RTC_CLASS
853 select HAVE_S3C2410_I2C if I2C
854 select HAVE_S3C2410_WATCHDOG if WATCHDOG
855 select NEED_MACH_MEMORY_H
857 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
866 select ARCH_USES_GETTIMEOFFSET
867 select NEED_MACH_MEMORY_H
869 Support for the StrongARM based Digital DNARD machine, also known
870 as "Shark" (<http://www.shark-linux.de/shark.html>).
873 bool "Telechips TCC ARM926-based systems"
878 select GENERIC_CLOCKEVENTS
880 Support for Telechips TCC ARM926-based systems.
883 bool "ST-Ericsson U300 Series"
887 select HAVE_SCHED_CLOCK
890 select ARM_PATCH_PHYS_VIRT
892 select GENERIC_CLOCKEVENTS
894 select HAVE_MACH_CLKDEV
896 select ARCH_REQUIRE_GPIOLIB
897 select NEED_MACH_MEMORY_H
899 Support for ST-Ericsson U300 series mobile platforms.
902 bool "ST-Ericsson U8500 Series"
905 select GENERIC_CLOCKEVENTS
907 select ARCH_REQUIRE_GPIOLIB
908 select ARCH_HAS_CPUFREQ
910 Support for ST-Ericsson's Ux500 architecture
913 bool "STMicroelectronics Nomadik"
918 select GENERIC_CLOCKEVENTS
919 select ARCH_REQUIRE_GPIOLIB
920 select MULTI_IRQ_HANDLER
922 Support for the Nomadik platform by ST-Ericsson
926 select GENERIC_CLOCKEVENTS
927 select ARCH_REQUIRE_GPIOLIB
931 select GENERIC_ALLOCATOR
932 select GENERIC_IRQ_CHIP
933 select ARCH_HAS_HOLES_MEMORYMODEL
935 Support for TI's DaVinci platform.
940 select ARCH_REQUIRE_GPIOLIB
941 select ARCH_HAS_CPUFREQ
943 select GENERIC_CLOCKEVENTS
944 select HAVE_SCHED_CLOCK
945 select ARCH_HAS_HOLES_MEMORYMODEL
947 Support for TI's OMAP platform (OMAP1/2/3/4).
952 select ARCH_REQUIRE_GPIOLIB
955 select GENERIC_CLOCKEVENTS
958 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
961 bool "VIA/WonderMedia 85xx"
964 select ARCH_HAS_CPUFREQ
965 select GENERIC_CLOCKEVENTS
966 select ARCH_REQUIRE_GPIOLIB
969 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
972 bool "Xilinx Zynq ARM Cortex A9 Platform"
974 select GENERIC_CLOCKEVENTS
981 Support for Xilinx Zynq ARM Cortex A9 Platform
985 # This is sorted alphabetically by mach-* pathname. However, plat-*
986 # Kconfigs may be included either alphabetically (according to the
987 # plat- suffix) or along side the corresponding mach-* source.
989 source "arch/arm/mach-at91/Kconfig"
991 source "arch/arm/mach-bcmring/Kconfig"
993 source "arch/arm/mach-clps711x/Kconfig"
995 source "arch/arm/mach-cns3xxx/Kconfig"
997 source "arch/arm/mach-davinci/Kconfig"
999 source "arch/arm/mach-dove/Kconfig"
1001 source "arch/arm/mach-ep93xx/Kconfig"
1003 source "arch/arm/mach-footbridge/Kconfig"
1005 source "arch/arm/mach-gemini/Kconfig"
1007 source "arch/arm/mach-h720x/Kconfig"
1009 source "arch/arm/mach-integrator/Kconfig"
1011 source "arch/arm/mach-iop32x/Kconfig"
1013 source "arch/arm/mach-iop33x/Kconfig"
1015 source "arch/arm/mach-iop13xx/Kconfig"
1017 source "arch/arm/mach-ixp4xx/Kconfig"
1019 source "arch/arm/mach-ixp2000/Kconfig"
1021 source "arch/arm/mach-ixp23xx/Kconfig"
1023 source "arch/arm/mach-kirkwood/Kconfig"
1025 source "arch/arm/mach-ks8695/Kconfig"
1027 source "arch/arm/mach-lpc32xx/Kconfig"
1029 source "arch/arm/mach-msm/Kconfig"
1031 source "arch/arm/mach-mv78xx0/Kconfig"
1033 source "arch/arm/plat-mxc/Kconfig"
1035 source "arch/arm/mach-mxs/Kconfig"
1037 source "arch/arm/mach-netx/Kconfig"
1039 source "arch/arm/mach-nomadik/Kconfig"
1040 source "arch/arm/plat-nomadik/Kconfig"
1042 source "arch/arm/plat-omap/Kconfig"
1044 source "arch/arm/mach-omap1/Kconfig"
1046 source "arch/arm/mach-omap2/Kconfig"
1048 source "arch/arm/mach-orion5x/Kconfig"
1050 source "arch/arm/mach-pxa/Kconfig"
1051 source "arch/arm/plat-pxa/Kconfig"
1053 source "arch/arm/mach-mmp/Kconfig"
1055 source "arch/arm/mach-realview/Kconfig"
1057 source "arch/arm/mach-sa1100/Kconfig"
1059 source "arch/arm/plat-samsung/Kconfig"
1060 source "arch/arm/plat-s3c24xx/Kconfig"
1061 source "arch/arm/plat-s5p/Kconfig"
1063 source "arch/arm/plat-spear/Kconfig"
1065 source "arch/arm/plat-tcc/Kconfig"
1068 source "arch/arm/mach-s3c2410/Kconfig"
1069 source "arch/arm/mach-s3c2412/Kconfig"
1070 source "arch/arm/mach-s3c2416/Kconfig"
1071 source "arch/arm/mach-s3c2440/Kconfig"
1072 source "arch/arm/mach-s3c2443/Kconfig"
1076 source "arch/arm/mach-s3c64xx/Kconfig"
1079 source "arch/arm/mach-s5p64x0/Kconfig"
1081 source "arch/arm/mach-s5pc100/Kconfig"
1083 source "arch/arm/mach-s5pv210/Kconfig"
1085 source "arch/arm/mach-exynos/Kconfig"
1087 source "arch/arm/mach-shmobile/Kconfig"
1089 source "arch/arm/mach-tegra/Kconfig"
1091 source "arch/arm/mach-u300/Kconfig"
1093 source "arch/arm/mach-ux500/Kconfig"
1095 source "arch/arm/mach-versatile/Kconfig"
1097 source "arch/arm/mach-vexpress/Kconfig"
1098 source "arch/arm/plat-versatile/Kconfig"
1100 source "arch/arm/mach-vt8500/Kconfig"
1102 source "arch/arm/mach-w90x900/Kconfig"
1104 # Definitions to make life easier
1110 select GENERIC_CLOCKEVENTS
1111 select HAVE_SCHED_CLOCK
1116 select GENERIC_IRQ_CHIP
1117 select HAVE_SCHED_CLOCK
1122 config PLAT_VERSATILE
1125 config ARM_TIMER_SP804
1129 source arch/arm/mm/Kconfig
1132 bool "Enable iWMMXt support"
1133 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1134 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1136 Enable support for iWMMXt context switching at run time if
1137 running on a CPU that supports it.
1139 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
1142 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
1146 depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
1147 (!ARCH_OMAP3 || OMAP3_EMU)
1151 config MULTI_IRQ_HANDLER
1154 Allow each machine to specify it's own IRQ handler at run time.
1157 source "arch/arm/Kconfig-nommu"
1160 config ARM_ERRATA_411920
1161 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1162 depends on CPU_V6 || CPU_V6K
1164 Invalidation of the Instruction Cache operation can
1165 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1166 It does not affect the MPCore. This option enables the ARM Ltd.
1167 recommended workaround.
1169 config ARM_ERRATA_430973
1170 bool "ARM errata: Stale prediction on replaced interworking branch"
1173 This option enables the workaround for the 430973 Cortex-A8
1174 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1175 interworking branch is replaced with another code sequence at the
1176 same virtual address, whether due to self-modifying code or virtual
1177 to physical address re-mapping, Cortex-A8 does not recover from the
1178 stale interworking branch prediction. This results in Cortex-A8
1179 executing the new code sequence in the incorrect ARM or Thumb state.
1180 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1181 and also flushes the branch target cache at every context switch.
1182 Note that setting specific bits in the ACTLR register may not be
1183 available in non-secure mode.
1185 config ARM_ERRATA_458693
1186 bool "ARM errata: Processor deadlock when a false hazard is created"
1189 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1190 erratum. For very specific sequences of memory operations, it is
1191 possible for a hazard condition intended for a cache line to instead
1192 be incorrectly associated with a different cache line. This false
1193 hazard might then cause a processor deadlock. The workaround enables
1194 the L1 caching of the NEON accesses and disables the PLD instruction
1195 in the ACTLR register. Note that setting specific bits in the ACTLR
1196 register may not be available in non-secure mode.
1198 config ARM_ERRATA_460075
1199 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1202 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1203 erratum. Any asynchronous access to the L2 cache may encounter a
1204 situation in which recent store transactions to the L2 cache are lost
1205 and overwritten with stale memory contents from external memory. The
1206 workaround disables the write-allocate mode for the L2 cache via the
1207 ACTLR register. Note that setting specific bits in the ACTLR register
1208 may not be available in non-secure mode.
1210 config ARM_ERRATA_742230
1211 bool "ARM errata: DMB operation may be faulty"
1212 depends on CPU_V7 && SMP
1214 This option enables the workaround for the 742230 Cortex-A9
1215 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1216 between two write operations may not ensure the correct visibility
1217 ordering of the two writes. This workaround sets a specific bit in
1218 the diagnostic register of the Cortex-A9 which causes the DMB
1219 instruction to behave as a DSB, ensuring the correct behaviour of
1222 config ARM_ERRATA_742231
1223 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1224 depends on CPU_V7 && SMP
1226 This option enables the workaround for the 742231 Cortex-A9
1227 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1228 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1229 accessing some data located in the same cache line, may get corrupted
1230 data due to bad handling of the address hazard when the line gets
1231 replaced from one of the CPUs at the same time as another CPU is
1232 accessing it. This workaround sets specific bits in the diagnostic
1233 register of the Cortex-A9 which reduces the linefill issuing
1234 capabilities of the processor.
1236 config PL310_ERRATA_588369
1237 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1238 depends on CACHE_L2X0
1240 The PL310 L2 cache controller implements three types of Clean &
1241 Invalidate maintenance operations: by Physical Address
1242 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1243 They are architecturally defined to behave as the execution of a
1244 clean operation followed immediately by an invalidate operation,
1245 both performing to the same memory location. This functionality
1246 is not correctly implemented in PL310 as clean lines are not
1247 invalidated as a result of these operations.
1249 config ARM_ERRATA_720789
1250 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1251 depends on CPU_V7 && SMP
1253 This option enables the workaround for the 720789 Cortex-A9 (prior to
1254 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1255 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1256 As a consequence of this erratum, some TLB entries which should be
1257 invalidated are not, resulting in an incoherency in the system page
1258 tables. The workaround changes the TLB flushing routines to invalidate
1259 entries regardless of the ASID.
1261 config PL310_ERRATA_727915
1262 bool "Background Clean & Invalidate by Way operation can cause data corruption"
1263 depends on CACHE_L2X0
1265 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1266 operation (offset 0x7FC). This operation runs in background so that
1267 PL310 can handle normal accesses while it is in progress. Under very
1268 rare circumstances, due to this erratum, write data can be lost when
1269 PL310 treats a cacheable write transaction during a Clean &
1270 Invalidate by Way operation.
1272 config ARM_ERRATA_743622
1273 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1276 This option enables the workaround for the 743622 Cortex-A9
1277 (r2p0..r2p2) erratum. Under very rare conditions, a faulty
1278 optimisation in the Cortex-A9 Store Buffer may lead to data
1279 corruption. This workaround sets a specific bit in the diagnostic
1280 register of the Cortex-A9 which disables the Store Buffer
1281 optimisation, preventing the defect from occurring. This has no
1282 visible impact on the overall performance or power consumption of the
1285 config ARM_ERRATA_751472
1286 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1287 depends on CPU_V7 && SMP
1289 This option enables the workaround for the 751472 Cortex-A9 (prior
1290 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1291 completion of a following broadcasted operation if the second
1292 operation is received by a CPU before the ICIALLUIS has completed,
1293 potentially leading to corrupted entries in the cache or TLB.
1295 config ARM_ERRATA_753970
1296 bool "ARM errata: cache sync operation may be faulty"
1297 depends on CACHE_PL310
1299 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1301 Under some condition the effect of cache sync operation on
1302 the store buffer still remains when the operation completes.
1303 This means that the store buffer is always asked to drain and
1304 this prevents it from merging any further writes. The workaround
1305 is to replace the normal offset of cache sync operation (0x730)
1306 by another offset targeting an unmapped PL310 register 0x740.
1307 This has the same effect as the cache sync operation: store buffer
1308 drain and waiting for all buffers empty.
1310 config ARM_ERRATA_754322
1311 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1314 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1315 r3p*) erratum. A speculative memory access may cause a page table walk
1316 which starts prior to an ASID switch but completes afterwards. This
1317 can populate the micro-TLB with a stale entry which may be hit with
1318 the new ASID. This workaround places two dsb instructions in the mm
1319 switching code so that no page table walks can cross the ASID switch.
1321 config ARM_ERRATA_754327
1322 bool "ARM errata: no automatic Store Buffer drain"
1323 depends on CPU_V7 && SMP
1325 This option enables the workaround for the 754327 Cortex-A9 (prior to
1326 r2p0) erratum. The Store Buffer does not have any automatic draining
1327 mechanism and therefore a livelock may occur if an external agent
1328 continuously polls a memory location waiting to observe an update.
1329 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1330 written polling loops from denying visibility of updates to memory.
1332 config ARM_ERRATA_364296
1333 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1334 depends on CPU_V6 && !SMP
1336 This options enables the workaround for the 364296 ARM1136
1337 r0p2 erratum (possible cache data corruption with
1338 hit-under-miss enabled). It sets the undocumented bit 31 in
1339 the auxiliary control register and the FI bit in the control
1340 register, thus disabling hit-under-miss without putting the
1341 processor into full low interrupt latency mode. ARM11MPCore
1344 config ARM_ERRATA_764369
1345 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1346 depends on CPU_V7 && SMP
1348 This option enables the workaround for erratum 764369
1349 affecting Cortex-A9 MPCore with two or more processors (all
1350 current revisions). Under certain timing circumstances, a data
1351 cache line maintenance operation by MVA targeting an Inner
1352 Shareable memory region may fail to proceed up to either the
1353 Point of Coherency or to the Point of Unification of the
1354 system. This workaround adds a DSB instruction before the
1355 relevant cache maintenance functions and sets a specific bit
1356 in the diagnostic control register of the SCU.
1360 source "arch/arm/common/Kconfig"
1370 Find out whether you have ISA slots on your motherboard. ISA is the
1371 name of a bus system, i.e. the way the CPU talks to the other stuff
1372 inside your box. Other bus systems are PCI, EISA, MicroChannel
1373 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1374 newer boards don't support it. If you have ISA, say Y, otherwise N.
1376 # Select ISA DMA controller support
1381 # Select ISA DMA interface
1386 bool "PCI support" if MIGHT_HAVE_PCI
1388 Find out whether you have a PCI motherboard. PCI is the name of a
1389 bus system, i.e. the way the CPU talks to the other stuff inside
1390 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1391 VESA. If you have PCI, say Y, otherwise N.
1397 config PCI_NANOENGINE
1398 bool "BSE nanoEngine PCI support"
1399 depends on SA1100_NANOENGINE
1401 Enable PCI on the BSE nanoEngine board.
1406 # Select the host bridge type
1407 config PCI_HOST_VIA82C505
1409 depends on PCI && ARCH_SHARK
1412 config PCI_HOST_ITE8152
1414 depends on PCI && MACH_ARMCORE
1418 source "drivers/pci/Kconfig"
1420 source "drivers/pcmcia/Kconfig"
1424 menu "Kernel Features"
1426 source "kernel/time/Kconfig"
1429 bool "Symmetric Multi-Processing"
1430 depends on CPU_V6K || CPU_V7
1431 depends on GENERIC_CLOCKEVENTS
1432 depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
1433 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1434 ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
1435 ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE || ARCH_HIGHBANK || SOC_IMX6Q
1437 select USE_GENERIC_SMP_HELPERS
1438 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1440 This enables support for systems with more than one CPU. If you have
1441 a system with only one CPU, like most personal computers, say N. If
1442 you have a system with more than one CPU, say Y.
1444 If you say N here, the kernel will run on single and multiprocessor
1445 machines, but will use only one CPU of a multiprocessor machine. If
1446 you say Y here, the kernel will run on many, but not all, single
1447 processor machines. On a single processor machine, the kernel will
1448 run faster if you say N here.
1450 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1451 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1452 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1454 If you don't know what to do here, say N.
1457 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1458 depends on EXPERIMENTAL
1459 depends on SMP && !XIP_KERNEL
1462 SMP kernels contain instructions which fail on non-SMP processors.
1463 Enabling this option allows the kernel to modify itself to make
1464 these instructions safe. Disabling it allows about 1K of space
1467 If you don't know what to do here, say Y.
1469 config ARM_CPU_TOPOLOGY
1470 bool "Support cpu topology definition"
1471 depends on SMP && CPU_V7
1474 Support ARM cpu topology definition. The MPIDR register defines
1475 affinity between processors which is then used to describe the cpu
1476 topology of an ARM System.
1479 bool "Multi-core scheduler support"
1480 depends on ARM_CPU_TOPOLOGY
1482 Multi-core scheduler support improves the CPU scheduler's decision
1483 making when dealing with multi-core CPU chips at a cost of slightly
1484 increased overhead in some places. If unsure say N here.
1487 bool "SMT scheduler support"
1488 depends on ARM_CPU_TOPOLOGY
1490 Improves the CPU scheduler's decision making when dealing with
1491 MultiThreading at a cost of slightly increased overhead in some
1492 places. If unsure say N here.
1497 This option enables support for the ARM system coherency unit
1504 This options enables support for the ARM timer and watchdog unit
1507 prompt "Memory split"
1510 Select the desired split between kernel and user memory.
1512 If you are not absolutely sure what you are doing, leave this
1516 bool "3G/1G user/kernel split"
1518 bool "2G/2G user/kernel split"
1520 bool "1G/3G user/kernel split"
1525 default 0x40000000 if VMSPLIT_1G
1526 default 0x80000000 if VMSPLIT_2G
1530 int "Maximum number of CPUs (2-32)"
1536 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1537 depends on SMP && HOTPLUG && EXPERIMENTAL
1539 Say Y here to experiment with turning CPUs off and on. CPUs
1540 can be controlled through /sys/devices/system/cpu.
1543 bool "Use local timer interrupts"
1546 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1548 Enable support for local timers on SMP platforms, rather then the
1549 legacy IPI broadcast method. Local timers allows the system
1550 accounting to be spread across the timer interval, preventing a
1551 "thundering herd" at every timer tick.
1553 source kernel/Kconfig.preempt
1557 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
1558 ARCH_S5PV210 || ARCH_EXYNOS4
1559 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1560 default AT91_TIMER_HZ if ARCH_AT91
1561 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1564 config THUMB2_KERNEL
1565 bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
1566 depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
1568 select ARM_ASM_UNIFIED
1571 By enabling this option, the kernel will be compiled in
1572 Thumb-2 mode. A compiler/assembler that understand the unified
1573 ARM-Thumb syntax is needed.
1577 config THUMB2_AVOID_R_ARM_THM_JUMP11
1578 bool "Work around buggy Thumb-2 short branch relocations in gas"
1579 depends on THUMB2_KERNEL && MODULES
1582 Various binutils versions can resolve Thumb-2 branches to
1583 locally-defined, preemptible global symbols as short-range "b.n"
1584 branch instructions.
1586 This is a problem, because there's no guarantee the final
1587 destination of the symbol, or any candidate locations for a
1588 trampoline, are within range of the branch. For this reason, the
1589 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1590 relocation in modules at all, and it makes little sense to add
1593 The symptom is that the kernel fails with an "unsupported
1594 relocation" error when loading some modules.
1596 Until fixed tools are available, passing
1597 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1598 code which hits this problem, at the cost of a bit of extra runtime
1599 stack usage in some cases.
1601 The problem is described in more detail at:
1602 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1604 Only Thumb-2 kernels are affected.
1606 Unless you are sure your tools don't have this problem, say Y.
1608 config ARM_ASM_UNIFIED
1612 bool "Use the ARM EABI to compile the kernel"
1614 This option allows for the kernel to be compiled using the latest
1615 ARM ABI (aka EABI). This is only useful if you are using a user
1616 space environment that is also compiled with EABI.
1618 Since there are major incompatibilities between the legacy ABI and
1619 EABI, especially with regard to structure member alignment, this
1620 option also changes the kernel syscall calling convention to
1621 disambiguate both ABIs and allow for backward compatibility support
1622 (selected with CONFIG_OABI_COMPAT).
1624 To use this you need GCC version 4.0.0 or later.
1627 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1628 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1631 This option preserves the old syscall interface along with the
1632 new (ARM EABI) one. It also provides a compatibility layer to
1633 intercept syscalls that have structure arguments which layout
1634 in memory differs between the legacy ABI and the new ARM EABI
1635 (only for non "thumb" binaries). This option adds a tiny
1636 overhead to all syscalls and produces a slightly larger kernel.
1637 If you know you'll be using only pure EABI user space then you
1638 can say N here. If this option is not selected and you attempt
1639 to execute a legacy ABI binary then the result will be
1640 UNPREDICTABLE (in fact it can be predicted that it won't work
1641 at all). If in doubt say Y.
1643 config ARCH_HAS_HOLES_MEMORYMODEL
1646 config ARCH_SPARSEMEM_ENABLE
1649 config ARCH_SPARSEMEM_DEFAULT
1650 def_bool ARCH_SPARSEMEM_ENABLE
1652 config ARCH_SELECT_MEMORY_MODEL
1653 def_bool ARCH_SPARSEMEM_ENABLE
1655 config HAVE_ARCH_PFN_VALID
1656 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1659 bool "High Memory Support"
1662 The address space of ARM processors is only 4 Gigabytes large
1663 and it has to accommodate user address space, kernel address
1664 space as well as some memory mapped IO. That means that, if you
1665 have a large amount of physical memory and/or IO, not all of the
1666 memory can be "permanently mapped" by the kernel. The physical
1667 memory that is not permanently mapped is called "high memory".
1669 Depending on the selected kernel/user memory split, minimum
1670 vmalloc space and actual amount of RAM, you may not need this
1671 option which should result in a slightly faster kernel.
1676 bool "Allocate 2nd-level pagetables from highmem"
1679 config HW_PERF_EVENTS
1680 bool "Enable hardware performance counter support for perf events"
1681 depends on PERF_EVENTS && CPU_HAS_PMU
1684 Enable hardware performance counter support for perf events. If
1685 disabled, perf events will use software events only.
1689 config FORCE_MAX_ZONEORDER
1690 int "Maximum zone order" if ARCH_SHMOBILE
1691 range 11 64 if ARCH_SHMOBILE
1692 default "9" if SA1111
1695 The kernel memory allocator divides physically contiguous memory
1696 blocks into "zones", where each zone is a power of two number of
1697 pages. This option selects the largest power of two that the kernel
1698 keeps in the memory allocator. If you need to allocate very large
1699 blocks of physically contiguous memory, then you may need to
1700 increase this value.
1702 This config option is actually maximum order plus one. For example,
1703 a value of 11 means that the largest free memory block is 2^10 pages.
1706 bool "Timer and CPU usage LEDs"
1707 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1708 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1709 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1710 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1711 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1712 ARCH_AT91 || ARCH_DAVINCI || \
1713 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1715 If you say Y here, the LEDs on your machine will be used
1716 to provide useful information about your current system status.
1718 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1719 be able to select which LEDs are active using the options below. If
1720 you are compiling a kernel for the EBSA-110 or the LART however, the
1721 red LED will simply flash regularly to indicate that the system is
1722 still functional. It is safe to say Y here if you have a CATS
1723 system, but the driver will do nothing.
1726 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1727 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1728 || MACH_OMAP_PERSEUS2
1730 depends on !GENERIC_CLOCKEVENTS
1731 default y if ARCH_EBSA110
1733 If you say Y here, one of the system LEDs (the green one on the
1734 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1735 will flash regularly to indicate that the system is still
1736 operational. This is mainly useful to kernel hackers who are
1737 debugging unstable kernels.
1739 The LART uses the same LED for both Timer LED and CPU usage LED
1740 functions. You may choose to use both, but the Timer LED function
1741 will overrule the CPU usage LED.
1744 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1746 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1747 || MACH_OMAP_PERSEUS2
1750 If you say Y here, the red LED will be used to give a good real
1751 time indication of CPU usage, by lighting whenever the idle task
1752 is not currently executing.
1754 The LART uses the same LED for both Timer LED and CPU usage LED
1755 functions. You may choose to use both, but the Timer LED function
1756 will overrule the CPU usage LED.
1758 config ALIGNMENT_TRAP
1760 depends on CPU_CP15_MMU
1761 default y if !ARCH_EBSA110
1762 select HAVE_PROC_CPU if PROC_FS
1764 ARM processors cannot fetch/store information which is not
1765 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1766 address divisible by 4. On 32-bit ARM processors, these non-aligned
1767 fetch/store instructions will be emulated in software if you say
1768 here, which has a severe performance impact. This is necessary for
1769 correct operation of some network protocols. With an IP-only
1770 configuration it is safe to say N, otherwise say Y.
1772 config UACCESS_WITH_MEMCPY
1773 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1774 depends on MMU && EXPERIMENTAL
1775 default y if CPU_FEROCEON
1777 Implement faster copy_to_user and clear_user methods for CPU
1778 cores where a 8-word STM instruction give significantly higher
1779 memory write throughput than a sequence of individual 32bit stores.
1781 A possible side effect is a slight increase in scheduling latency
1782 between threads sharing the same address space if they invoke
1783 such copy operations with large buffers.
1785 However, if the CPU data cache is using a write-allocate mode,
1786 this option is unlikely to provide any performance gain.
1790 prompt "Enable seccomp to safely compute untrusted bytecode"
1792 This kernel feature is useful for number crunching applications
1793 that may need to compute untrusted bytecode during their
1794 execution. By using pipes or other transports made available to
1795 the process as file descriptors supporting the read/write
1796 syscalls, it's possible to isolate those applications in
1797 their own address space using seccomp. Once seccomp is
1798 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1799 and the task is only allowed to execute a few safe syscalls
1800 defined by each seccomp mode.
1802 config CC_STACKPROTECTOR
1803 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1804 depends on EXPERIMENTAL
1806 This option turns on the -fstack-protector GCC feature. This
1807 feature puts, at the beginning of functions, a canary value on
1808 the stack just before the return address, and validates
1809 the value just before actually returning. Stack based buffer
1810 overflows (that need to overwrite this return address) now also
1811 overwrite the canary, which gets detected and the attack is then
1812 neutralized via a kernel panic.
1813 This feature requires gcc version 4.2 or above.
1815 config DEPRECATED_PARAM_STRUCT
1816 bool "Provide old way to pass kernel parameters"
1818 This was deprecated in 2001 and announced to live on for 5 years.
1819 Some old boot loaders still use this way.
1826 bool "Flattened Device Tree support"
1828 select OF_EARLY_FLATTREE
1831 Include support for flattened device tree machine descriptions.
1833 # Compressed boot loader in ROM. Yes, we really want to ask about
1834 # TEXT and BSS so we preserve their values in the config files.
1835 config ZBOOT_ROM_TEXT
1836 hex "Compressed ROM boot loader base address"
1839 The physical address at which the ROM-able zImage is to be
1840 placed in the target. Platforms which normally make use of
1841 ROM-able zImage formats normally set this to a suitable
1842 value in their defconfig file.
1844 If ZBOOT_ROM is not enabled, this has no effect.
1846 config ZBOOT_ROM_BSS
1847 hex "Compressed ROM boot loader BSS address"
1850 The base address of an area of read/write memory in the target
1851 for the ROM-able zImage which must be available while the
1852 decompressor is running. It must be large enough to hold the
1853 entire decompressed kernel plus an additional 128 KiB.
1854 Platforms which normally make use of ROM-able zImage formats
1855 normally set this to a suitable value in their defconfig file.
1857 If ZBOOT_ROM is not enabled, this has no effect.
1860 bool "Compressed boot loader in ROM/flash"
1861 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1863 Say Y here if you intend to execute your compressed kernel image
1864 (zImage) directly from ROM or flash. If unsure, say N.
1867 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1868 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1869 default ZBOOT_ROM_NONE
1871 Include experimental SD/MMC loading code in the ROM-able zImage.
1872 With this enabled it is possible to write the the ROM-able zImage
1873 kernel image to an MMC or SD card and boot the kernel straight
1874 from the reset vector. At reset the processor Mask ROM will load
1875 the first part of the the ROM-able zImage which in turn loads the
1876 rest the kernel image to RAM.
1878 config ZBOOT_ROM_NONE
1879 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1881 Do not load image from SD or MMC
1883 config ZBOOT_ROM_MMCIF
1884 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1886 Load image from MMCIF hardware block.
1888 config ZBOOT_ROM_SH_MOBILE_SDHI
1889 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1891 Load image from SDHI hardware block
1895 config ARM_APPENDED_DTB
1896 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1897 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1899 With this option, the boot code will look for a device tree binary
1900 (DTB) appended to zImage
1901 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1903 This is meant as a backward compatibility convenience for those
1904 systems with a bootloader that can't be upgraded to accommodate
1905 the documented boot protocol using a device tree.
1907 Beware that there is very little in terms of protection against
1908 this option being confused by leftover garbage in memory that might
1909 look like a DTB header after a reboot if no actual DTB is appended
1910 to zImage. Do not leave this option active in a production kernel
1911 if you don't intend to always append a DTB. Proper passing of the
1912 location into r2 of a bootloader provided DTB is always preferable
1915 config ARM_ATAG_DTB_COMPAT
1916 bool "Supplement the appended DTB with traditional ATAG information"
1917 depends on ARM_APPENDED_DTB
1919 Some old bootloaders can't be updated to a DTB capable one, yet
1920 they provide ATAGs with memory configuration, the ramdisk address,
1921 the kernel cmdline string, etc. Such information is dynamically
1922 provided by the bootloader and can't always be stored in a static
1923 DTB. To allow a device tree enabled kernel to be used with such
1924 bootloaders, this option allows zImage to extract the information
1925 from the ATAG list and store it at run time into the appended DTB.
1928 string "Default kernel command string"
1931 On some architectures (EBSA110 and CATS), there is currently no way
1932 for the boot loader to pass arguments to the kernel. For these
1933 architectures, you should supply some command-line options at build
1934 time by entering them here. As a minimum, you should specify the
1935 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1938 prompt "Kernel command line type" if CMDLINE != ""
1939 default CMDLINE_FROM_BOOTLOADER
1941 config CMDLINE_FROM_BOOTLOADER
1942 bool "Use bootloader kernel arguments if available"
1944 Uses the command-line options passed by the boot loader. If
1945 the boot loader doesn't provide any, the default kernel command
1946 string provided in CMDLINE will be used.
1948 config CMDLINE_EXTEND
1949 bool "Extend bootloader kernel arguments"
1951 The command-line arguments provided by the boot loader will be
1952 appended to the default kernel command string.
1954 config CMDLINE_FORCE
1955 bool "Always use the default kernel command string"
1957 Always use the default kernel command string, even if the boot
1958 loader passes other arguments to the kernel.
1959 This is useful if you cannot or don't want to change the
1960 command-line options your boot loader passes to the kernel.
1964 bool "Kernel Execute-In-Place from ROM"
1965 depends on !ZBOOT_ROM
1967 Execute-In-Place allows the kernel to run from non-volatile storage
1968 directly addressable by the CPU, such as NOR flash. This saves RAM
1969 space since the text section of the kernel is not loaded from flash
1970 to RAM. Read-write sections, such as the data section and stack,
1971 are still copied to RAM. The XIP kernel is not compressed since
1972 it has to run directly from flash, so it will take more space to
1973 store it. The flash address used to link the kernel object files,
1974 and for storing it, is configuration dependent. Therefore, if you
1975 say Y here, you must know the proper physical address where to
1976 store the kernel image depending on your own flash memory usage.
1978 Also note that the make target becomes "make xipImage" rather than
1979 "make zImage" or "make Image". The final kernel binary to put in
1980 ROM memory will be arch/arm/boot/xipImage.
1984 config XIP_PHYS_ADDR
1985 hex "XIP Kernel Physical Location"
1986 depends on XIP_KERNEL
1987 default "0x00080000"
1989 This is the physical address in your flash memory the kernel will
1990 be linked for and stored to. This address is dependent on your
1994 bool "Kexec system call (EXPERIMENTAL)"
1995 depends on EXPERIMENTAL
1997 kexec is a system call that implements the ability to shutdown your
1998 current kernel, and to start another kernel. It is like a reboot
1999 but it is independent of the system firmware. And like a reboot
2000 you can start any kernel with it, not just Linux.
2002 It is an ongoing process to be certain the hardware in a machine
2003 is properly shutdown, so do not be surprised if this code does not
2004 initially work for you. It may help to enable device hotplugging
2008 bool "Export atags in procfs"
2012 Should the atags used to boot the kernel be exported in an "atags"
2013 file in procfs. Useful with kexec.
2016 bool "Build kdump crash kernel (EXPERIMENTAL)"
2017 depends on EXPERIMENTAL
2019 Generate crash dump after being started by kexec. This should
2020 be normally only set in special crash dump kernels which are
2021 loaded in the main kernel with kexec-tools into a specially
2022 reserved region and then later executed after a crash by
2023 kdump/kexec. The crash dump kernel must be compiled to a
2024 memory address not used by the main kernel
2026 For more details see Documentation/kdump/kdump.txt
2028 config AUTO_ZRELADDR
2029 bool "Auto calculation of the decompressed kernel image address"
2030 depends on !ZBOOT_ROM && !ARCH_U300
2032 ZRELADDR is the physical address where the decompressed kernel
2033 image will be placed. If AUTO_ZRELADDR is selected, the address
2034 will be determined at run-time by masking the current IP with
2035 0xf8000000. This assumes the zImage being placed in the first 128MB
2036 from start of memory.
2040 menu "CPU Power Management"
2044 source "drivers/cpufreq/Kconfig"
2047 tristate "CPUfreq driver for i.MX CPUs"
2048 depends on ARCH_MXC && CPU_FREQ
2050 This enables the CPUfreq driver for i.MX CPUs.
2052 config CPU_FREQ_SA1100
2055 config CPU_FREQ_SA1110
2058 config CPU_FREQ_INTEGRATOR
2059 tristate "CPUfreq driver for ARM Integrator CPUs"
2060 depends on ARCH_INTEGRATOR && CPU_FREQ
2063 This enables the CPUfreq driver for ARM Integrator CPUs.
2065 For details, take a look at <file:Documentation/cpu-freq>.
2071 depends on CPU_FREQ && ARCH_PXA && PXA25x
2073 select CPU_FREQ_TABLE
2074 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2079 Internal configuration node for common cpufreq on Samsung SoC
2081 config CPU_FREQ_S3C24XX
2082 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2083 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
2086 This enables the CPUfreq driver for the Samsung S3C24XX family
2089 For details, take a look at <file:Documentation/cpu-freq>.
2093 config CPU_FREQ_S3C24XX_PLL
2094 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2095 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2097 Compile in support for changing the PLL frequency from the
2098 S3C24XX series CPUfreq driver. The PLL takes time to settle
2099 after a frequency change, so by default it is not enabled.
2101 This also means that the PLL tables for the selected CPU(s) will
2102 be built which may increase the size of the kernel image.
2104 config CPU_FREQ_S3C24XX_DEBUG
2105 bool "Debug CPUfreq Samsung driver core"
2106 depends on CPU_FREQ_S3C24XX
2108 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2110 config CPU_FREQ_S3C24XX_IODEBUG
2111 bool "Debug CPUfreq Samsung driver IO timing"
2112 depends on CPU_FREQ_S3C24XX
2114 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2116 config CPU_FREQ_S3C24XX_DEBUGFS
2117 bool "Export debugfs for CPUFreq"
2118 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2120 Export status information via debugfs.
2124 source "drivers/cpuidle/Kconfig"
2128 menu "Floating point emulation"
2130 comment "At least one emulation must be selected"
2133 bool "NWFPE math emulation"
2134 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2136 Say Y to include the NWFPE floating point emulator in the kernel.
2137 This is necessary to run most binaries. Linux does not currently
2138 support floating point hardware so you need to say Y here even if
2139 your machine has an FPA or floating point co-processor podule.
2141 You may say N here if you are going to load the Acorn FPEmulator
2142 early in the bootup.
2145 bool "Support extended precision"
2146 depends on FPE_NWFPE
2148 Say Y to include 80-bit support in the kernel floating-point
2149 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2150 Note that gcc does not generate 80-bit operations by default,
2151 so in most cases this option only enlarges the size of the
2152 floating point emulator without any good reason.
2154 You almost surely want to say N here.
2157 bool "FastFPE math emulation (EXPERIMENTAL)"
2158 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2160 Say Y here to include the FAST floating point emulator in the kernel.
2161 This is an experimental much faster emulator which now also has full
2162 precision for the mantissa. It does not support any exceptions.
2163 It is very simple, and approximately 3-6 times faster than NWFPE.
2165 It should be sufficient for most programs. It may be not suitable
2166 for scientific calculations, but you have to check this for yourself.
2167 If you do not feel you need a faster FP emulation you should better
2171 bool "VFP-format floating point maths"
2172 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2174 Say Y to include VFP support code in the kernel. This is needed
2175 if your hardware includes a VFP unit.
2177 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2178 release notes and additional status information.
2180 Say N if your target does not have VFP hardware.
2188 bool "Advanced SIMD (NEON) Extension support"
2189 depends on VFPv3 && CPU_V7
2191 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2196 menu "Userspace binary formats"
2198 source "fs/Kconfig.binfmt"
2201 tristate "RISC OS personality"
2204 Say Y here to include the kernel code necessary if you want to run
2205 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2206 experimental; if this sounds frightening, say N and sleep in peace.
2207 You can also say M here to compile this support as a module (which
2208 will be called arthur).
2212 menu "Power management options"
2214 source "kernel/power/Kconfig"
2216 config ARCH_SUSPEND_POSSIBLE
2217 depends on !ARCH_S5PC100
2218 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2219 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
2222 config ARM_CPU_SUSPEND
2227 source "net/Kconfig"
2229 source "drivers/Kconfig"
2233 source "arch/arm/Kconfig.debug"
2235 source "security/Kconfig"
2237 source "crypto/Kconfig"
2239 source "lib/Kconfig"