Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

Linux/arch/arm/Kconfig

  1 config ARM
  2         bool
  3         default y
  4         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  5         select ARCH_HAS_ELF_RANDOMIZE
  6         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  7         select ARCH_HAVE_CUSTOM_GPIO_H
  8         select ARCH_HAS_GCOV_PROFILE_ALL
  9         select ARCH_MIGHT_HAVE_PC_PARPORT
 10         select ARCH_SUPPORTS_ATOMIC_RMW
 11         select ARCH_USE_BUILTIN_BSWAP
 12         select ARCH_USE_CMPXCHG_LOCKREF
 13         select ARCH_WANT_IPC_PARSE_VERSION
 14         select BUILDTIME_EXTABLE_SORT if MMU
 15         select CLONE_BACKWARDS
 16         select CPU_PM if (SUSPEND || CPU_IDLE)
 17         select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
 18         select EDAC_SUPPORT
 19         select EDAC_ATOMIC_SCRUB
 20         select GENERIC_ALLOCATOR
 21         select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
 22         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 23         select GENERIC_IDLE_POLL_SETUP
 24         select GENERIC_IRQ_PROBE
 25         select GENERIC_IRQ_SHOW
 26         select GENERIC_IRQ_SHOW_LEVEL
 27         select GENERIC_PCI_IOMAP
 28         select GENERIC_SCHED_CLOCK
 29         select GENERIC_SMP_IDLE_THREAD
 30         select GENERIC_STRNCPY_FROM_USER
 31         select GENERIC_STRNLEN_USER
 32         select HANDLE_DOMAIN_IRQ
 33         select HARDIRQS_SW_RESEND
 34         select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
 35         select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
 36         select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32
 37         select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32
 38         select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
 39         select HAVE_ARCH_TRACEHOOK
 40         select HAVE_BPF_JIT
 41         select HAVE_CC_STACKPROTECTOR
 42         select HAVE_CONTEXT_TRACKING
 43         select HAVE_C_RECORDMCOUNT
 44         select HAVE_DEBUG_KMEMLEAK
 45         select HAVE_DMA_API_DEBUG
 46         select HAVE_DMA_ATTRS
 47         select HAVE_DMA_CONTIGUOUS if MMU
 48         select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32
 49         select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
 50         select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
 51         select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
 52         select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
 53         select HAVE_GENERIC_DMA_COHERENT
 54         select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
 55         select HAVE_IDE if PCI || ISA || PCMCIA
 56         select HAVE_IRQ_TIME_ACCOUNTING
 57         select HAVE_KERNEL_GZIP
 58         select HAVE_KERNEL_LZ4
 59         select HAVE_KERNEL_LZMA
 60         select HAVE_KERNEL_LZO
 61         select HAVE_KERNEL_XZ
 62         select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
 63         select HAVE_KRETPROBES if (HAVE_KPROBES)
 64         select HAVE_MEMBLOCK
 65         select HAVE_MOD_ARCH_SPECIFIC
 66         select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
 67         select HAVE_OPTPROBES if !THUMB2_KERNEL
 68         select HAVE_PERF_EVENTS
 69         select HAVE_PERF_REGS
 70         select HAVE_PERF_USER_STACK_DUMP
 71         select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
 72         select HAVE_REGS_AND_STACK_ACCESS_API
 73         select HAVE_SYSCALL_TRACEPOINTS
 74         select HAVE_UID16
 75         select HAVE_VIRT_CPU_ACCOUNTING_GEN
 76         select IRQ_FORCED_THREADING
 77         select MODULES_USE_ELF_REL
 78         select NO_BOOTMEM
 79         select OF_EARLY_FLATTREE if OF
 80         select OF_RESERVED_MEM if OF
 81         select OLD_SIGACTION
 82         select OLD_SIGSUSPEND3
 83         select PERF_USE_VMALLOC
 84         select RTC_LIB
 85         select SYS_SUPPORTS_APM_EMULATION
 86         # Above selects are sorted alphabetically; please add new ones
 87         # according to that.  Thanks.
 88         help
 89           The ARM series is a line of low-power-consumption RISC chip designs
 90           licensed by ARM Ltd and targeted at embedded applications and
 91           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
 92           manufactured, but legacy ARM-based PC hardware remains popular in
 93           Europe.  There is an ARM Linux project with a web page at
 94           <http://www.arm.linux.org.uk/>.
 95 
 96 config ARM_HAS_SG_CHAIN
 97         select ARCH_HAS_SG_CHAIN
 98         bool
 99 
100 config NEED_SG_DMA_LENGTH
101         bool
102 
103 config ARM_DMA_USE_IOMMU
104         bool
105         select ARM_HAS_SG_CHAIN
106         select NEED_SG_DMA_LENGTH
107 
108 if ARM_DMA_USE_IOMMU
109 
110 config ARM_DMA_IOMMU_ALIGNMENT
111         int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
112         range 4 9
113         default 8
114         help
115           DMA mapping framework by default aligns all buffers to the smallest
116           PAGE_SIZE order which is greater than or equal to the requested buffer
117           size. This works well for buffers up to a few hundreds kilobytes, but
118           for larger buffers it just a waste of address space. Drivers which has
119           relatively small addressing window (like 64Mib) might run out of
120           virtual space with just a few allocations.
121 
122           With this parameter you can specify the maximum PAGE_SIZE order for
123           DMA IOMMU buffers. Larger buffers will be aligned only to this
124           specified order. The order is expressed as a power of two multiplied
125           by the PAGE_SIZE.
126 
127 endif
128 
129 config MIGHT_HAVE_PCI
130         bool
131 
132 config SYS_SUPPORTS_APM_EMULATION
133         bool
134 
135 config HAVE_TCM
136         bool
137         select GENERIC_ALLOCATOR
138 
139 config HAVE_PROC_CPU
140         bool
141 
142 config NO_IOPORT_MAP
143         bool
144 
145 config EISA
146         bool
147         ---help---
148           The Extended Industry Standard Architecture (EISA) bus was
149           developed as an open alternative to the IBM MicroChannel bus.
150 
151           The EISA bus provided some of the features of the IBM MicroChannel
152           bus while maintaining backward compatibility with cards made for
153           the older ISA bus.  The EISA bus saw limited use between 1988 and
154           1995 when it was made obsolete by the PCI bus.
155 
156           Say Y here if you are building a kernel for an EISA-based machine.
157 
158           Otherwise, say N.
159 
160 config SBUS
161         bool
162 
163 config STACKTRACE_SUPPORT
164         bool
165         default y
166 
167 config HAVE_LATENCYTOP_SUPPORT
168         bool
169         depends on !SMP
170         default y
171 
172 config LOCKDEP_SUPPORT
173         bool
174         default y
175 
176 config TRACE_IRQFLAGS_SUPPORT
177         bool
178         default !CPU_V7M
179 
180 config RWSEM_XCHGADD_ALGORITHM
181         bool
182         default y
183 
184 config ARCH_HAS_ILOG2_U32
185         bool
186 
187 config ARCH_HAS_ILOG2_U64
188         bool
189 
190 config ARCH_HAS_BANDGAP
191         bool
192 
193 config FIX_EARLYCON_MEM
194         def_bool y if MMU
195 
196 config GENERIC_HWEIGHT
197         bool
198         default y
199 
200 config GENERIC_CALIBRATE_DELAY
201         bool
202         default y
203 
204 config ARCH_MAY_HAVE_PC_FDC
205         bool
206 
207 config ZONE_DMA
208         bool
209 
210 config NEED_DMA_MAP_STATE
211        def_bool y
212 
213 config ARCH_SUPPORTS_UPROBES
214         def_bool y
215 
216 config ARCH_HAS_DMA_SET_COHERENT_MASK
217         bool
218 
219 config GENERIC_ISA_DMA
220         bool
221 
222 config FIQ
223         bool
224 
225 config NEED_RET_TO_USER
226         bool
227 
228 config ARCH_MTD_XIP
229         bool
230 
231 config VECTORS_BASE
232         hex
233         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
234         default DRAM_BASE if REMAP_VECTORS_TO_RAM
235         default 0x00000000
236         help
237           The base address of exception vectors.  This must be two pages
238           in size.
239 
240 config ARM_PATCH_PHYS_VIRT
241         bool "Patch physical to virtual translations at runtime" if EMBEDDED
242         default y
243         depends on !XIP_KERNEL && MMU
244         depends on !ARCH_REALVIEW || !SPARSEMEM
245         help
246           Patch phys-to-virt and virt-to-phys translation functions at
247           boot and module load time according to the position of the
248           kernel in system memory.
249 
250           This can only be used with non-XIP MMU kernels where the base
251           of physical memory is at a 16MB boundary.
252 
253           Only disable this option if you know that you do not require
254           this feature (eg, building a kernel for a single machine) and
255           you need to shrink the kernel to the minimal size.
256 
257 config NEED_MACH_IO_H
258         bool
259         help
260           Select this when mach/io.h is required to provide special
261           definitions for this platform.  The need for mach/io.h should
262           be avoided when possible.
263 
264 config NEED_MACH_MEMORY_H
265         bool
266         help
267           Select this when mach/memory.h is required to provide special
268           definitions for this platform.  The need for mach/memory.h should
269           be avoided when possible.
270 
271 config PHYS_OFFSET
272         hex "Physical address of main memory" if MMU
273         depends on !ARM_PATCH_PHYS_VIRT
274         default DRAM_BASE if !MMU
275         default 0x00000000 if ARCH_EBSA110 || \
276                         ARCH_FOOTBRIDGE || \
277                         ARCH_INTEGRATOR || \
278                         ARCH_IOP13XX || \
279                         ARCH_KS8695 || \
280                         (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
281         default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
282         default 0x20000000 if ARCH_S5PV210
283         default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
284         default 0xc0000000 if ARCH_SA1100
285         help
286           Please provide the physical address corresponding to the
287           location of main memory in your system.
288 
289 config GENERIC_BUG
290         def_bool y
291         depends on BUG
292 
293 config PGTABLE_LEVELS
294         int
295         default 3 if ARM_LPAE
296         default 2
297 
298 source "init/Kconfig"
299 
300 source "kernel/Kconfig.freezer"
301 
302 menu "System Type"
303 
304 config MMU
305         bool "MMU-based Paged Memory Management Support"
306         default y
307         help
308           Select if you want MMU-based virtualised addressing space
309           support by paged memory management. If unsure, say 'Y'.
310 
311 #
312 # The "ARM system type" choice list is ordered alphabetically by option
313 # text.  Please add new entries in the option alphabetic order.
314 #
315 choice
316         prompt "ARM system type"
317         default ARCH_VERSATILE if !MMU
318         default ARCH_MULTIPLATFORM if MMU
319 
320 config ARCH_MULTIPLATFORM
321         bool "Allow multiple platforms to be selected"
322         depends on MMU
323         select ARCH_WANT_OPTIONAL_GPIOLIB
324         select ARM_HAS_SG_CHAIN
325         select ARM_PATCH_PHYS_VIRT
326         select AUTO_ZRELADDR
327         select CLKSRC_OF
328         select COMMON_CLK
329         select GENERIC_CLOCKEVENTS
330         select MIGHT_HAVE_PCI
331         select MULTI_IRQ_HANDLER
332         select SPARSE_IRQ
333         select USE_OF
334 
335 config ARM_SINGLE_ARMV7M
336         bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
337         depends on !MMU
338         select ARCH_WANT_OPTIONAL_GPIOLIB
339         select ARM_NVIC
340         select AUTO_ZRELADDR
341         select CLKSRC_OF
342         select COMMON_CLK
343         select CPU_V7M
344         select GENERIC_CLOCKEVENTS
345         select NO_IOPORT_MAP
346         select SPARSE_IRQ
347         select USE_OF
348 
349 config ARCH_REALVIEW
350         bool "ARM Ltd. RealView family"
351         select ARCH_WANT_OPTIONAL_GPIOLIB
352         select ARM_AMBA
353         select ARM_TIMER_SP804
354         select COMMON_CLK
355         select COMMON_CLK_VERSATILE
356         select GENERIC_CLOCKEVENTS
357         select GPIO_PL061 if GPIOLIB
358         select ICST
359         select NEED_MACH_MEMORY_H
360         select PLAT_VERSATILE
361         select PLAT_VERSATILE_SCHED_CLOCK
362         help
363           This enables support for ARM Ltd RealView boards.
364 
365 config ARCH_VERSATILE
366         bool "ARM Ltd. Versatile family"
367         select ARCH_WANT_OPTIONAL_GPIOLIB
368         select ARM_AMBA
369         select ARM_TIMER_SP804
370         select ARM_VIC
371         select CLKDEV_LOOKUP
372         select GENERIC_CLOCKEVENTS
373         select HAVE_MACH_CLKDEV
374         select ICST
375         select PLAT_VERSATILE
376         select PLAT_VERSATILE_CLOCK
377         select PLAT_VERSATILE_SCHED_CLOCK
378         select VERSATILE_FPGA_IRQ
379         help
380           This enables support for ARM Ltd Versatile board.
381 
382 config ARCH_CLPS711X
383         bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
384         select ARCH_REQUIRE_GPIOLIB
385         select AUTO_ZRELADDR
386         select CLKSRC_MMIO
387         select COMMON_CLK
388         select CPU_ARM720T
389         select GENERIC_CLOCKEVENTS
390         select MFD_SYSCON
391         select SOC_BUS
392         help
393           Support for Cirrus Logic 711x/721x/731x based boards.
394 
395 config ARCH_GEMINI
396         bool "Cortina Systems Gemini"
397         select ARCH_REQUIRE_GPIOLIB
398         select CLKSRC_MMIO
399         select CPU_FA526
400         select GENERIC_CLOCKEVENTS
401         help
402           Support for the Cortina Systems Gemini family SoCs
403 
404 config ARCH_EBSA110
405         bool "EBSA-110"
406         select ARCH_USES_GETTIMEOFFSET
407         select CPU_SA110
408         select ISA
409         select NEED_MACH_IO_H
410         select NEED_MACH_MEMORY_H
411         select NO_IOPORT_MAP
412         help
413           This is an evaluation board for the StrongARM processor available
414           from Digital. It has limited hardware on-board, including an
415           Ethernet interface, two PCMCIA sockets, two serial ports and a
416           parallel port.
417 
418 config ARCH_EP93XX
419         bool "EP93xx-based"
420         select ARCH_HAS_HOLES_MEMORYMODEL
421         select ARCH_REQUIRE_GPIOLIB
422         select ARM_AMBA
423         select ARM_PATCH_PHYS_VIRT
424         select ARM_VIC
425         select AUTO_ZRELADDR
426         select CLKDEV_LOOKUP
427         select CLKSRC_MMIO
428         select CPU_ARM920T
429         select GENERIC_CLOCKEVENTS
430         help
431           This enables support for the Cirrus EP93xx series of CPUs.
432 
433 config ARCH_FOOTBRIDGE
434         bool "FootBridge"
435         select CPU_SA110
436         select FOOTBRIDGE
437         select GENERIC_CLOCKEVENTS
438         select HAVE_IDE
439         select NEED_MACH_IO_H if !MMU
440         select NEED_MACH_MEMORY_H
441         help
442           Support for systems based on the DC21285 companion chip
443           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
444 
445 config ARCH_NETX
446         bool "Hilscher NetX based"
447         select ARM_VIC
448         select CLKSRC_MMIO
449         select CPU_ARM926T
450         select GENERIC_CLOCKEVENTS
451         help
452           This enables support for systems based on the Hilscher NetX Soc
453 
454 config ARCH_IOP13XX
455         bool "IOP13xx-based"
456         depends on MMU
457         select CPU_XSC3
458         select NEED_MACH_MEMORY_H
459         select NEED_RET_TO_USER
460         select PCI
461         select PLAT_IOP
462         select VMSPLIT_1G
463         select SPARSE_IRQ
464         help
465           Support for Intel's IOP13XX (XScale) family of processors.
466 
467 config ARCH_IOP32X
468         bool "IOP32x-based"
469         depends on MMU
470         select ARCH_REQUIRE_GPIOLIB
471         select CPU_XSCALE
472         select GPIO_IOP
473         select NEED_RET_TO_USER
474         select PCI
475         select PLAT_IOP
476         help
477           Support for Intel's 80219 and IOP32X (XScale) family of
478           processors.
479 
480 config ARCH_IOP33X
481         bool "IOP33x-based"
482         depends on MMU
483         select ARCH_REQUIRE_GPIOLIB
484         select CPU_XSCALE
485         select GPIO_IOP
486         select NEED_RET_TO_USER
487         select PCI
488         select PLAT_IOP
489         help
490           Support for Intel's IOP33X (XScale) family of processors.
491 
492 config ARCH_IXP4XX
493         bool "IXP4xx-based"
494         depends on MMU
495         select ARCH_HAS_DMA_SET_COHERENT_MASK
496         select ARCH_REQUIRE_GPIOLIB
497         select ARCH_SUPPORTS_BIG_ENDIAN
498         select CLKSRC_MMIO
499         select CPU_XSCALE
500         select DMABOUNCE if PCI
501         select GENERIC_CLOCKEVENTS
502         select MIGHT_HAVE_PCI
503         select NEED_MACH_IO_H
504         select USB_EHCI_BIG_ENDIAN_DESC
505         select USB_EHCI_BIG_ENDIAN_MMIO
506         help
507           Support for Intel's IXP4XX (XScale) family of processors.
508 
509 config ARCH_DOVE
510         bool "Marvell Dove"
511         select ARCH_REQUIRE_GPIOLIB
512         select CPU_PJ4
513         select GENERIC_CLOCKEVENTS
514         select MIGHT_HAVE_PCI
515         select MVEBU_MBUS
516         select PINCTRL
517         select PINCTRL_DOVE
518         select PLAT_ORION_LEGACY
519         help
520           Support for the Marvell Dove SoC 88AP510
521 
522 config ARCH_MV78XX0
523         bool "Marvell MV78xx0"
524         select ARCH_REQUIRE_GPIOLIB
525         select CPU_FEROCEON
526         select GENERIC_CLOCKEVENTS
527         select MVEBU_MBUS
528         select PCI
529         select PLAT_ORION_LEGACY
530         help
531           Support for the following Marvell MV78xx0 series SoCs:
532           MV781x0, MV782x0.
533 
534 config ARCH_ORION5X
535         bool "Marvell Orion"
536         depends on MMU
537         select ARCH_REQUIRE_GPIOLIB
538         select CPU_FEROCEON
539         select GENERIC_CLOCKEVENTS
540         select MVEBU_MBUS
541         select PCI
542         select PLAT_ORION_LEGACY
543         select MULTI_IRQ_HANDLER
544         help
545           Support for the following Marvell Orion 5x series SoCs:
546           Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
547           Orion-2 (5281), Orion-1-90 (6183).
548 
549 config ARCH_MMP
550         bool "Marvell PXA168/910/MMP2"
551         depends on MMU
552         select ARCH_REQUIRE_GPIOLIB
553         select CLKDEV_LOOKUP
554         select GENERIC_ALLOCATOR
555         select GENERIC_CLOCKEVENTS
556         select GPIO_PXA
557         select IRQ_DOMAIN
558         select MULTI_IRQ_HANDLER
559         select PINCTRL
560         select PLAT_PXA
561         select SPARSE_IRQ
562         help
563           Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
564 
565 config ARCH_KS8695
566         bool "Micrel/Kendin KS8695"
567         select ARCH_REQUIRE_GPIOLIB
568         select CLKSRC_MMIO
569         select CPU_ARM922T
570         select GENERIC_CLOCKEVENTS
571         select NEED_MACH_MEMORY_H
572         help
573           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
574           System-on-Chip devices.
575 
576 config ARCH_W90X900
577         bool "Nuvoton W90X900 CPU"
578         select ARCH_REQUIRE_GPIOLIB
579         select CLKDEV_LOOKUP
580         select CLKSRC_MMIO
581         select CPU_ARM926T
582         select GENERIC_CLOCKEVENTS
583         help
584           Support for Nuvoton (Winbond logic dept.) ARM9 processor,
585           At present, the w90x900 has been renamed nuc900, regarding
586           the ARM series product line, you can login the following
587           link address to know more.
588 
589           <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
590                 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
591 
592 config ARCH_LPC32XX
593         bool "NXP LPC32XX"
594         select ARCH_REQUIRE_GPIOLIB
595         select ARM_AMBA
596         select CLKDEV_LOOKUP
597         select CLKSRC_MMIO
598         select CPU_ARM926T
599         select GENERIC_CLOCKEVENTS
600         select HAVE_IDE
601         select USE_OF
602         help
603           Support for the NXP LPC32XX family of processors
604 
605 config ARCH_PXA
606         bool "PXA2xx/PXA3xx-based"
607         depends on MMU
608         select ARCH_MTD_XIP
609         select ARCH_REQUIRE_GPIOLIB
610         select ARM_CPU_SUSPEND if PM
611         select AUTO_ZRELADDR
612         select COMMON_CLK
613         select CLKDEV_LOOKUP
614         select CLKSRC_MMIO
615         select CLKSRC_OF
616         select GENERIC_CLOCKEVENTS
617         select GPIO_PXA
618         select HAVE_IDE
619         select IRQ_DOMAIN
620         select MULTI_IRQ_HANDLER
621         select PLAT_PXA
622         select SPARSE_IRQ
623         help
624           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
625 
626 config ARCH_RPC
627         bool "RiscPC"
628         depends on MMU
629         select ARCH_ACORN
630         select ARCH_MAY_HAVE_PC_FDC
631         select ARCH_SPARSEMEM_ENABLE
632         select ARCH_USES_GETTIMEOFFSET
633         select CPU_SA110
634         select FIQ
635         select HAVE_IDE
636         select HAVE_PATA_PLATFORM
637         select ISA_DMA_API
638         select NEED_MACH_IO_H
639         select NEED_MACH_MEMORY_H
640         select NO_IOPORT_MAP
641         select VIRT_TO_BUS
642         help
643           On the Acorn Risc-PC, Linux can support the internal IDE disk and
644           CD-ROM interface, serial and parallel port, and the floppy drive.
645 
646 config ARCH_SA1100
647         bool "SA1100-based"
648         select ARCH_MTD_XIP
649         select ARCH_REQUIRE_GPIOLIB
650         select ARCH_SPARSEMEM_ENABLE
651         select CLKDEV_LOOKUP
652         select CLKSRC_MMIO
653         select CPU_FREQ
654         select CPU_SA1100
655         select GENERIC_CLOCKEVENTS
656         select HAVE_IDE
657         select IRQ_DOMAIN
658         select ISA
659         select MULTI_IRQ_HANDLER
660         select NEED_MACH_MEMORY_H
661         select SPARSE_IRQ
662         help
663           Support for StrongARM 11x0 based boards.
664 
665 config ARCH_S3C24XX
666         bool "Samsung S3C24XX SoCs"
667         select ARCH_REQUIRE_GPIOLIB
668         select ATAGS
669         select CLKDEV_LOOKUP
670         select CLKSRC_SAMSUNG_PWM
671         select GENERIC_CLOCKEVENTS
672         select GPIO_SAMSUNG
673         select HAVE_S3C2410_I2C if I2C
674         select HAVE_S3C2410_WATCHDOG if WATCHDOG
675         select HAVE_S3C_RTC if RTC_CLASS
676         select MULTI_IRQ_HANDLER
677         select NEED_MACH_IO_H
678         select SAMSUNG_ATAGS
679         help
680           Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
681           and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
682           (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
683           Samsung SMDK2410 development board (and derivatives).
684 
685 config ARCH_S3C64XX
686         bool "Samsung S3C64XX"
687         select ARCH_REQUIRE_GPIOLIB
688         select ARM_AMBA
689         select ARM_VIC
690         select ATAGS
691         select CLKDEV_LOOKUP
692         select CLKSRC_SAMSUNG_PWM
693         select COMMON_CLK_SAMSUNG
694         select CPU_V6K
695         select GENERIC_CLOCKEVENTS
696         select GPIO_SAMSUNG
697         select HAVE_S3C2410_I2C if I2C
698         select HAVE_S3C2410_WATCHDOG if WATCHDOG
699         select HAVE_TCM
700         select NO_IOPORT_MAP
701         select PLAT_SAMSUNG
702         select PM_GENERIC_DOMAINS if PM
703         select S3C_DEV_NAND
704         select S3C_GPIO_TRACK
705         select SAMSUNG_ATAGS
706         select SAMSUNG_WAKEMASK
707         select SAMSUNG_WDT_RESET
708         help
709           Samsung S3C64XX series based systems
710 
711 config ARCH_DAVINCI
712         bool "TI DaVinci"
713         select ARCH_HAS_HOLES_MEMORYMODEL
714         select ARCH_REQUIRE_GPIOLIB
715         select CLKDEV_LOOKUP
716         select GENERIC_ALLOCATOR
717         select GENERIC_CLOCKEVENTS
718         select GENERIC_IRQ_CHIP
719         select HAVE_IDE
720         select USE_OF
721         select ZONE_DMA
722         help
723           Support for TI's DaVinci platform.
724 
725 config ARCH_OMAP1
726         bool "TI OMAP1"
727         depends on MMU
728         select ARCH_HAS_HOLES_MEMORYMODEL
729         select ARCH_OMAP
730         select ARCH_REQUIRE_GPIOLIB
731         select CLKDEV_LOOKUP
732         select CLKSRC_MMIO
733         select GENERIC_CLOCKEVENTS
734         select GENERIC_IRQ_CHIP
735         select HAVE_IDE
736         select IRQ_DOMAIN
737         select MULTI_IRQ_HANDLER
738         select NEED_MACH_IO_H if PCCARD
739         select NEED_MACH_MEMORY_H
740         select SPARSE_IRQ
741         help
742           Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
743 
744 endchoice
745 
746 menu "Multiple platform selection"
747         depends on ARCH_MULTIPLATFORM
748 
749 comment "CPU Core family selection"
750 
751 config ARCH_MULTI_V4
752         bool "ARMv4 based platforms (FA526)"
753         depends on !ARCH_MULTI_V6_V7
754         select ARCH_MULTI_V4_V5
755         select CPU_FA526
756 
757 config ARCH_MULTI_V4T
758         bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
759         depends on !ARCH_MULTI_V6_V7
760         select ARCH_MULTI_V4_V5
761         select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
762                 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
763                 CPU_ARM925T || CPU_ARM940T)
764 
765 config ARCH_MULTI_V5
766         bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
767         depends on !ARCH_MULTI_V6_V7
768         select ARCH_MULTI_V4_V5
769         select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
770                 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
771                 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
772 
773 config ARCH_MULTI_V4_V5
774         bool
775 
776 config ARCH_MULTI_V6
777         bool "ARMv6 based platforms (ARM11)"
778         select ARCH_MULTI_V6_V7
779         select CPU_V6K
780 
781 config ARCH_MULTI_V7
782         bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
783         default y
784         select ARCH_MULTI_V6_V7
785         select CPU_V7
786         select HAVE_SMP
787 
788 config ARCH_MULTI_V6_V7
789         bool
790         select MIGHT_HAVE_CACHE_L2X0
791 
792 config ARCH_MULTI_CPU_AUTO
793         def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
794         select ARCH_MULTI_V5
795 
796 endmenu
797 
798 config ARCH_VIRT
799         bool "Dummy Virtual Machine" if ARCH_MULTI_V7
800         select ARM_AMBA
801         select ARM_GIC
802         select ARM_GIC_V3
803         select ARM_PSCI
804         select HAVE_ARM_ARCH_TIMER
805 
806 #
807 # This is sorted alphabetically by mach-* pathname.  However, plat-*
808 # Kconfigs may be included either alphabetically (according to the
809 # plat- suffix) or along side the corresponding mach-* source.
810 #
811 source "arch/arm/mach-mvebu/Kconfig"
812 
813 source "arch/arm/mach-alpine/Kconfig"
814 
815 source "arch/arm/mach-asm9260/Kconfig"
816 
817 source "arch/arm/mach-at91/Kconfig"
818 
819 source "arch/arm/mach-axxia/Kconfig"
820 
821 source "arch/arm/mach-bcm/Kconfig"
822 
823 source "arch/arm/mach-berlin/Kconfig"
824 
825 source "arch/arm/mach-clps711x/Kconfig"
826 
827 source "arch/arm/mach-cns3xxx/Kconfig"
828 
829 source "arch/arm/mach-davinci/Kconfig"
830 
831 source "arch/arm/mach-digicolor/Kconfig"
832 
833 source "arch/arm/mach-dove/Kconfig"
834 
835 source "arch/arm/mach-ep93xx/Kconfig"
836 
837 source "arch/arm/mach-footbridge/Kconfig"
838 
839 source "arch/arm/mach-gemini/Kconfig"
840 
841 source "arch/arm/mach-highbank/Kconfig"
842 
843 source "arch/arm/mach-hisi/Kconfig"
844 
845 source "arch/arm/mach-integrator/Kconfig"
846 
847 source "arch/arm/mach-iop32x/Kconfig"
848 
849 source "arch/arm/mach-iop33x/Kconfig"
850 
851 source "arch/arm/mach-iop13xx/Kconfig"
852 
853 source "arch/arm/mach-ixp4xx/Kconfig"
854 
855 source "arch/arm/mach-keystone/Kconfig"
856 
857 source "arch/arm/mach-ks8695/Kconfig"
858 
859 source "arch/arm/mach-meson/Kconfig"
860 
861 source "arch/arm/mach-moxart/Kconfig"
862 
863 source "arch/arm/mach-mv78xx0/Kconfig"
864 
865 source "arch/arm/mach-imx/Kconfig"
866 
867 source "arch/arm/mach-mediatek/Kconfig"
868 
869 source "arch/arm/mach-mxs/Kconfig"
870 
871 source "arch/arm/mach-netx/Kconfig"
872 
873 source "arch/arm/mach-nomadik/Kconfig"
874 
875 source "arch/arm/mach-nspire/Kconfig"
876 
877 source "arch/arm/plat-omap/Kconfig"
878 
879 source "arch/arm/mach-omap1/Kconfig"
880 
881 source "arch/arm/mach-omap2/Kconfig"
882 
883 source "arch/arm/mach-orion5x/Kconfig"
884 
885 source "arch/arm/mach-picoxcell/Kconfig"
886 
887 source "arch/arm/mach-pxa/Kconfig"
888 source "arch/arm/plat-pxa/Kconfig"
889 
890 source "arch/arm/mach-mmp/Kconfig"
891 
892 source "arch/arm/mach-qcom/Kconfig"
893 
894 source "arch/arm/mach-realview/Kconfig"
895 
896 source "arch/arm/mach-rockchip/Kconfig"
897 
898 source "arch/arm/mach-sa1100/Kconfig"
899 
900 source "arch/arm/mach-socfpga/Kconfig"
901 
902 source "arch/arm/mach-spear/Kconfig"
903 
904 source "arch/arm/mach-sti/Kconfig"
905 
906 source "arch/arm/mach-s3c24xx/Kconfig"
907 
908 source "arch/arm/mach-s3c64xx/Kconfig"
909 
910 source "arch/arm/mach-s5pv210/Kconfig"
911 
912 source "arch/arm/mach-exynos/Kconfig"
913 source "arch/arm/plat-samsung/Kconfig"
914 
915 source "arch/arm/mach-shmobile/Kconfig"
916 
917 source "arch/arm/mach-sunxi/Kconfig"
918 
919 source "arch/arm/mach-prima2/Kconfig"
920 
921 source "arch/arm/mach-tegra/Kconfig"
922 
923 source "arch/arm/mach-u300/Kconfig"
924 
925 source "arch/arm/mach-uniphier/Kconfig"
926 
927 source "arch/arm/mach-ux500/Kconfig"
928 
929 source "arch/arm/mach-versatile/Kconfig"
930 
931 source "arch/arm/mach-vexpress/Kconfig"
932 source "arch/arm/plat-versatile/Kconfig"
933 
934 source "arch/arm/mach-vt8500/Kconfig"
935 
936 source "arch/arm/mach-w90x900/Kconfig"
937 
938 source "arch/arm/mach-zx/Kconfig"
939 
940 source "arch/arm/mach-zynq/Kconfig"
941 
942 # ARMv7-M architecture
943 config ARCH_EFM32
944         bool "Energy Micro efm32"
945         depends on ARM_SINGLE_ARMV7M
946         select ARCH_REQUIRE_GPIOLIB
947         help
948           Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
949           processors.
950 
951 config ARCH_LPC18XX
952         bool "NXP LPC18xx/LPC43xx"
953         depends on ARM_SINGLE_ARMV7M
954         select ARCH_HAS_RESET_CONTROLLER
955         select ARM_AMBA
956         select CLKSRC_LPC32XX
957         select PINCTRL
958         help
959           Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
960           high performance microcontrollers.
961 
962 config ARCH_STM32
963         bool "STMicrolectronics STM32"
964         depends on ARM_SINGLE_ARMV7M
965         select ARCH_HAS_RESET_CONTROLLER
966         select ARMV7M_SYSTICK
967         select CLKSRC_STM32
968         select RESET_CONTROLLER
969         help
970           Support for STMicroelectronics STM32 processors.
971 
972 # Definitions to make life easier
973 config ARCH_ACORN
974         bool
975 
976 config PLAT_IOP
977         bool
978         select GENERIC_CLOCKEVENTS
979 
980 config PLAT_ORION
981         bool
982         select CLKSRC_MMIO
983         select COMMON_CLK
984         select GENERIC_IRQ_CHIP
985         select IRQ_DOMAIN
986 
987 config PLAT_ORION_LEGACY
988         bool
989         select PLAT_ORION
990 
991 config PLAT_PXA
992         bool
993 
994 config PLAT_VERSATILE
995         bool
996 
997 source "arch/arm/firmware/Kconfig"
998 
999 source arch/arm/mm/Kconfig
1000 
1001 config IWMMXT
1002         bool "Enable iWMMXt support"
1003         depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1004         default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1005         help
1006           Enable support for iWMMXt context switching at run time if
1007           running on a CPU that supports it.
1008 
1009 config MULTI_IRQ_HANDLER
1010         bool
1011         help
1012           Allow each machine to specify it's own IRQ handler at run time.
1013 
1014 if !MMU
1015 source "arch/arm/Kconfig-nommu"
1016 endif
1017 
1018 config PJ4B_ERRATA_4742
1019         bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1020         depends on CPU_PJ4B && MACH_ARMADA_370
1021         default y
1022         help
1023           When coming out of either a Wait for Interrupt (WFI) or a Wait for
1024           Event (WFE) IDLE states, a specific timing sensitivity exists between
1025           the retiring WFI/WFE instructions and the newly issued subsequent
1026           instructions.  This sensitivity can result in a CPU hang scenario.
1027           Workaround:
1028           The software must insert either a Data Synchronization Barrier (DSB)
1029           or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1030           instruction
1031 
1032 config ARM_ERRATA_326103
1033         bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1034         depends on CPU_V6
1035         help
1036           Executing a SWP instruction to read-only memory does not set bit 11
1037           of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1038           treat the access as a read, preventing a COW from occurring and
1039           causing the faulting task to livelock.
1040 
1041 config ARM_ERRATA_411920
1042         bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1043         depends on CPU_V6 || CPU_V6K
1044         help
1045           Invalidation of the Instruction Cache operation can
1046           fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1047           It does not affect the MPCore. This option enables the ARM Ltd.
1048           recommended workaround.
1049 
1050 config ARM_ERRATA_430973
1051         bool "ARM errata: Stale prediction on replaced interworking branch"
1052         depends on CPU_V7
1053         help
1054           This option enables the workaround for the 430973 Cortex-A8
1055           r1p* erratum. If a code sequence containing an ARM/Thumb
1056           interworking branch is replaced with another code sequence at the
1057           same virtual address, whether due to self-modifying code or virtual
1058           to physical address re-mapping, Cortex-A8 does not recover from the
1059           stale interworking branch prediction. This results in Cortex-A8
1060           executing the new code sequence in the incorrect ARM or Thumb state.
1061           The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1062           and also flushes the branch target cache at every context switch.
1063           Note that setting specific bits in the ACTLR register may not be
1064           available in non-secure mode.
1065 
1066 config ARM_ERRATA_458693
1067         bool "ARM errata: Processor deadlock when a false hazard is created"
1068         depends on CPU_V7
1069         depends on !ARCH_MULTIPLATFORM
1070         help
1071           This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1072           erratum. For very specific sequences of memory operations, it is
1073           possible for a hazard condition intended for a cache line to instead
1074           be incorrectly associated with a different cache line. This false
1075           hazard might then cause a processor deadlock. The workaround enables
1076           the L1 caching of the NEON accesses and disables the PLD instruction
1077           in the ACTLR register. Note that setting specific bits in the ACTLR
1078           register may not be available in non-secure mode.
1079 
1080 config ARM_ERRATA_460075
1081         bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1082         depends on CPU_V7
1083         depends on !ARCH_MULTIPLATFORM
1084         help
1085           This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1086           erratum. Any asynchronous access to the L2 cache may encounter a
1087           situation in which recent store transactions to the L2 cache are lost
1088           and overwritten with stale memory contents from external memory. The
1089           workaround disables the write-allocate mode for the L2 cache via the
1090           ACTLR register. Note that setting specific bits in the ACTLR register
1091           may not be available in non-secure mode.
1092 
1093 config ARM_ERRATA_742230
1094         bool "ARM errata: DMB operation may be faulty"
1095         depends on CPU_V7 && SMP
1096         depends on !ARCH_MULTIPLATFORM
1097         help
1098           This option enables the workaround for the 742230 Cortex-A9
1099           (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1100           between two write operations may not ensure the correct visibility
1101           ordering of the two writes. This workaround sets a specific bit in
1102           the diagnostic register of the Cortex-A9 which causes the DMB
1103           instruction to behave as a DSB, ensuring the correct behaviour of
1104           the two writes.
1105 
1106 config ARM_ERRATA_742231
1107         bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1108         depends on CPU_V7 && SMP
1109         depends on !ARCH_MULTIPLATFORM
1110         help
1111           This option enables the workaround for the 742231 Cortex-A9
1112           (r2p0..r2p2) erratum. Under certain conditions, specific to the
1113           Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1114           accessing some data located in the same cache line, may get corrupted
1115           data due to bad handling of the address hazard when the line gets
1116           replaced from one of the CPUs at the same time as another CPU is
1117           accessing it. This workaround sets specific bits in the diagnostic
1118           register of the Cortex-A9 which reduces the linefill issuing
1119           capabilities of the processor.
1120 
1121 config ARM_ERRATA_643719
1122         bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1123         depends on CPU_V7 && SMP
1124         default y
1125         help
1126           This option enables the workaround for the 643719 Cortex-A9 (prior to
1127           r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1128           register returns zero when it should return one. The workaround
1129           corrects this value, ensuring cache maintenance operations which use
1130           it behave as intended and avoiding data corruption.
1131 
1132 config ARM_ERRATA_720789
1133         bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1134         depends on CPU_V7
1135         help
1136           This option enables the workaround for the 720789 Cortex-A9 (prior to
1137           r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1138           broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1139           As a consequence of this erratum, some TLB entries which should be
1140           invalidated are not, resulting in an incoherency in the system page
1141           tables. The workaround changes the TLB flushing routines to invalidate
1142           entries regardless of the ASID.
1143 
1144 config ARM_ERRATA_743622
1145         bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1146         depends on CPU_V7
1147         depends on !ARCH_MULTIPLATFORM
1148         help
1149           This option enables the workaround for the 743622 Cortex-A9
1150           (r2p*) erratum. Under very rare conditions, a faulty
1151           optimisation in the Cortex-A9 Store Buffer may lead to data
1152           corruption. This workaround sets a specific bit in the diagnostic
1153           register of the Cortex-A9 which disables the Store Buffer
1154           optimisation, preventing the defect from occurring. This has no
1155           visible impact on the overall performance or power consumption of the
1156           processor.
1157 
1158 config ARM_ERRATA_751472
1159         bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1160         depends on CPU_V7
1161         depends on !ARCH_MULTIPLATFORM
1162         help
1163           This option enables the workaround for the 751472 Cortex-A9 (prior
1164           to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1165           completion of a following broadcasted operation if the second
1166           operation is received by a CPU before the ICIALLUIS has completed,
1167           potentially leading to corrupted entries in the cache or TLB.
1168 
1169 config ARM_ERRATA_754322
1170         bool "ARM errata: possible faulty MMU translations following an ASID switch"
1171         depends on CPU_V7
1172         help
1173           This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1174           r3p*) erratum. A speculative memory access may cause a page table walk
1175           which starts prior to an ASID switch but completes afterwards. This
1176           can populate the micro-TLB with a stale entry which may be hit with
1177           the new ASID. This workaround places two dsb instructions in the mm
1178           switching code so that no page table walks can cross the ASID switch.
1179 
1180 config ARM_ERRATA_754327
1181         bool "ARM errata: no automatic Store Buffer drain"
1182         depends on CPU_V7 && SMP
1183         help
1184           This option enables the workaround for the 754327 Cortex-A9 (prior to
1185           r2p0) erratum. The Store Buffer does not have any automatic draining
1186           mechanism and therefore a livelock may occur if an external agent
1187           continuously polls a memory location waiting to observe an update.
1188           This workaround defines cpu_relax() as smp_mb(), preventing correctly
1189           written polling loops from denying visibility of updates to memory.
1190 
1191 config ARM_ERRATA_364296
1192         bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1193         depends on CPU_V6
1194         help
1195           This options enables the workaround for the 364296 ARM1136
1196           r0p2 erratum (possible cache data corruption with
1197           hit-under-miss enabled). It sets the undocumented bit 31 in
1198           the auxiliary control register and the FI bit in the control
1199           register, thus disabling hit-under-miss without putting the
1200           processor into full low interrupt latency mode. ARM11MPCore
1201           is not affected.
1202 
1203 config ARM_ERRATA_764369
1204         bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1205         depends on CPU_V7 && SMP
1206         help
1207           This option enables the workaround for erratum 764369
1208           affecting Cortex-A9 MPCore with two or more processors (all
1209           current revisions). Under certain timing circumstances, a data
1210           cache line maintenance operation by MVA targeting an Inner
1211           Shareable memory region may fail to proceed up to either the
1212           Point of Coherency or to the Point of Unification of the
1213           system. This workaround adds a DSB instruction before the
1214           relevant cache maintenance functions and sets a specific bit
1215           in the diagnostic control register of the SCU.
1216 
1217 config ARM_ERRATA_775420
1218        bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1219        depends on CPU_V7
1220        help
1221          This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1222          r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1223          operation aborts with MMU exception, it might cause the processor
1224          to deadlock. This workaround puts DSB before executing ISB if
1225          an abort may occur on cache maintenance.
1226 
1227 config ARM_ERRATA_798181
1228         bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1229         depends on CPU_V7 && SMP
1230         help
1231           On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1232           adequately shooting down all use of the old entries. This
1233           option enables the Linux kernel workaround for this erratum
1234           which sends an IPI to the CPUs that are running the same ASID
1235           as the one being invalidated.
1236 
1237 config ARM_ERRATA_773022
1238         bool "ARM errata: incorrect instructions may be executed from loop buffer"
1239         depends on CPU_V7
1240         help
1241           This option enables the workaround for the 773022 Cortex-A15
1242           (up to r0p4) erratum. In certain rare sequences of code, the
1243           loop buffer may deliver incorrect instructions. This
1244           workaround disables the loop buffer to avoid the erratum.
1245 
1246 endmenu
1247 
1248 source "arch/arm/common/Kconfig"
1249 
1250 menu "Bus support"
1251 
1252 config ISA
1253         bool
1254         help
1255           Find out whether you have ISA slots on your motherboard.  ISA is the
1256           name of a bus system, i.e. the way the CPU talks to the other stuff
1257           inside your box.  Other bus systems are PCI, EISA, MicroChannel
1258           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1259           newer boards don't support it.  If you have ISA, say Y, otherwise N.
1260 
1261 # Select ISA DMA controller support
1262 config ISA_DMA
1263         bool
1264         select ISA_DMA_API
1265 
1266 # Select ISA DMA interface
1267 config ISA_DMA_API
1268         bool
1269 
1270 config PCI
1271         bool "PCI support" if MIGHT_HAVE_PCI
1272         help
1273           Find out whether you have a PCI motherboard. PCI is the name of a
1274           bus system, i.e. the way the CPU talks to the other stuff inside
1275           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1276           VESA. If you have PCI, say Y, otherwise N.
1277 
1278 config PCI_DOMAINS
1279         bool
1280         depends on PCI
1281 
1282 config PCI_DOMAINS_GENERIC
1283         def_bool PCI_DOMAINS
1284 
1285 config PCI_NANOENGINE
1286         bool "BSE nanoEngine PCI support"
1287         depends on SA1100_NANOENGINE
1288         help
1289           Enable PCI on the BSE nanoEngine board.
1290 
1291 config PCI_SYSCALL
1292         def_bool PCI
1293 
1294 config PCI_HOST_ITE8152
1295         bool
1296         depends on PCI && MACH_ARMCORE
1297         default y
1298         select DMABOUNCE
1299 
1300 source "drivers/pci/Kconfig"
1301 source "drivers/pci/pcie/Kconfig"
1302 
1303 source "drivers/pcmcia/Kconfig"
1304 
1305 endmenu
1306 
1307 menu "Kernel Features"
1308 
1309 config HAVE_SMP
1310         bool
1311         help
1312           This option should be selected by machines which have an SMP-
1313           capable CPU.
1314 
1315           The only effect of this option is to make the SMP-related
1316           options available to the user for configuration.
1317 
1318 config SMP
1319         bool "Symmetric Multi-Processing"
1320         depends on CPU_V6K || CPU_V7
1321         depends on GENERIC_CLOCKEVENTS
1322         depends on HAVE_SMP
1323         depends on MMU || ARM_MPU
1324         select IRQ_WORK
1325         help
1326           This enables support for systems with more than one CPU. If you have
1327           a system with only one CPU, say N. If you have a system with more
1328           than one CPU, say Y.
1329 
1330           If you say N here, the kernel will run on uni- and multiprocessor
1331           machines, but will use only one CPU of a multiprocessor machine. If
1332           you say Y here, the kernel will run on many, but not all,
1333           uniprocessor machines. On a uniprocessor machine, the kernel
1334           will run faster if you say N here.
1335 
1336           See also <file:Documentation/x86/i386/IO-APIC.txt>,
1337           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1338           <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1339 
1340           If you don't know what to do here, say N.
1341 
1342 config SMP_ON_UP
1343         bool "Allow booting SMP kernel on uniprocessor systems"
1344         depends on SMP && !XIP_KERNEL && MMU
1345         default y
1346         help
1347           SMP kernels contain instructions which fail on non-SMP processors.
1348           Enabling this option allows the kernel to modify itself to make
1349           these instructions safe.  Disabling it allows about 1K of space
1350           savings.
1351 
1352           If you don't know what to do here, say Y.
1353 
1354 config ARM_CPU_TOPOLOGY
1355         bool "Support cpu topology definition"
1356         depends on SMP && CPU_V7
1357         default y
1358         help
1359           Support ARM cpu topology definition. The MPIDR register defines
1360           affinity between processors which is then used to describe the cpu
1361           topology of an ARM System.
1362 
1363 config SCHED_MC
1364         bool "Multi-core scheduler support"
1365         depends on ARM_CPU_TOPOLOGY
1366         help
1367           Multi-core scheduler support improves the CPU scheduler's decision
1368           making when dealing with multi-core CPU chips at a cost of slightly
1369           increased overhead in some places. If unsure say N here.
1370 
1371 config SCHED_SMT
1372         bool "SMT scheduler support"
1373         depends on ARM_CPU_TOPOLOGY
1374         help
1375           Improves the CPU scheduler's decision making when dealing with
1376           MultiThreading at a cost of slightly increased overhead in some
1377           places. If unsure say N here.
1378 
1379 config HAVE_ARM_SCU
1380         bool
1381         help
1382           This option enables support for the ARM system coherency unit
1383 
1384 config HAVE_ARM_ARCH_TIMER
1385         bool "Architected timer support"
1386         depends on CPU_V7
1387         select ARM_ARCH_TIMER
1388         select GENERIC_CLOCKEVENTS
1389         help
1390           This option enables support for the ARM architected timer
1391 
1392 config HAVE_ARM_TWD
1393         bool
1394         select CLKSRC_OF if OF
1395         help
1396           This options enables support for the ARM timer and watchdog unit
1397 
1398 config MCPM
1399         bool "Multi-Cluster Power Management"
1400         depends on CPU_V7 && SMP
1401         help
1402           This option provides the common power management infrastructure
1403           for (multi-)cluster based systems, such as big.LITTLE based
1404           systems.
1405 
1406 config MCPM_QUAD_CLUSTER
1407         bool
1408         depends on MCPM
1409         help
1410           To avoid wasting resources unnecessarily, MCPM only supports up
1411           to 2 clusters by default.
1412           Platforms with 3 or 4 clusters that use MCPM must select this
1413           option to allow the additional clusters to be managed.
1414 
1415 config BIG_LITTLE
1416         bool "big.LITTLE support (Experimental)"
1417         depends on CPU_V7 && SMP
1418         select MCPM
1419         help
1420           This option enables support selections for the big.LITTLE
1421           system architecture.
1422 
1423 config BL_SWITCHER
1424         bool "big.LITTLE switcher support"
1425         depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1426         select ARM_CPU_SUSPEND
1427         select CPU_PM
1428         help
1429           The big.LITTLE "switcher" provides the core functionality to
1430           transparently handle transition between a cluster of A15's
1431           and a cluster of A7's in a big.LITTLE system.
1432 
1433 config BL_SWITCHER_DUMMY_IF
1434         tristate "Simple big.LITTLE switcher user interface"
1435         depends on BL_SWITCHER && DEBUG_KERNEL
1436         help
1437           This is a simple and dummy char dev interface to control
1438           the big.LITTLE switcher core code.  It is meant for
1439           debugging purposes only.
1440 
1441 choice
1442         prompt "Memory split"
1443         depends on MMU
1444         default VMSPLIT_3G
1445         help
1446           Select the desired split between kernel and user memory.
1447 
1448           If you are not absolutely sure what you are doing, leave this
1449           option alone!
1450 
1451         config VMSPLIT_3G
1452                 bool "3G/1G user/kernel split"
1453         config VMSPLIT_3G_OPT
1454                 bool "3G/1G user/kernel split (for full 1G low memory)"
1455         config VMSPLIT_2G
1456                 bool "2G/2G user/kernel split"
1457         config VMSPLIT_1G
1458                 bool "1G/3G user/kernel split"
1459 endchoice
1460 
1461 config PAGE_OFFSET
1462         hex
1463         default PHYS_OFFSET if !MMU
1464         default 0x40000000 if VMSPLIT_1G
1465         default 0x80000000 if VMSPLIT_2G
1466         default 0xB0000000 if VMSPLIT_3G_OPT
1467         default 0xC0000000
1468 
1469 config NR_CPUS
1470         int "Maximum number of CPUs (2-32)"
1471         range 2 32
1472         depends on SMP
1473         default "4"
1474 
1475 config HOTPLUG_CPU
1476         bool "Support for hot-pluggable CPUs"
1477         depends on SMP
1478         help
1479           Say Y here to experiment with turning CPUs off and on.  CPUs
1480           can be controlled through /sys/devices/system/cpu.
1481 
1482 config ARM_PSCI
1483         bool "Support for the ARM Power State Coordination Interface (PSCI)"
1484         depends on CPU_V7
1485         select ARM_PSCI_FW
1486         help
1487           Say Y here if you want Linux to communicate with system firmware
1488           implementing the PSCI specification for CPU-centric power
1489           management operations described in ARM document number ARM DEN
1490           0022A ("Power State Coordination Interface System Software on
1491           ARM processors").
1492 
1493 # The GPIO number here must be sorted by descending number. In case of
1494 # a multiplatform kernel, we just want the highest value required by the
1495 # selected platforms.
1496 config ARCH_NR_GPIO
1497         int
1498         default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1499                 ARCH_ZYNQ
1500         default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1501                 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1502         default 416 if ARCH_SUNXI
1503         default 392 if ARCH_U8500
1504         default 352 if ARCH_VT8500
1505         default 288 if ARCH_ROCKCHIP
1506         default 264 if MACH_H4700
1507         default 0
1508         help
1509           Maximum number of GPIOs in the system.
1510 
1511           If unsure, leave the default value.
1512 
1513 source kernel/Kconfig.preempt
1514 
1515 config HZ_FIXED
1516         int
1517         default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1518                 ARCH_S5PV210 || ARCH_EXYNOS4
1519         default 128 if SOC_AT91RM9200
1520         default 0
1521 
1522 choice
1523         depends on HZ_FIXED = 0
1524         prompt "Timer frequency"
1525 
1526 config HZ_100
1527         bool "100 Hz"
1528 
1529 config HZ_200
1530         bool "200 Hz"
1531 
1532 config HZ_250
1533         bool "250 Hz"
1534 
1535 config HZ_300
1536         bool "300 Hz"
1537 
1538 config HZ_500
1539         bool "500 Hz"
1540 
1541 config HZ_1000
1542         bool "1000 Hz"
1543 
1544 endchoice
1545 
1546 config HZ
1547         int
1548         default HZ_FIXED if HZ_FIXED != 0
1549         default 100 if HZ_100
1550         default 200 if HZ_200
1551         default 250 if HZ_250
1552         default 300 if HZ_300
1553         default 500 if HZ_500
1554         default 1000
1555 
1556 config SCHED_HRTICK
1557         def_bool HIGH_RES_TIMERS
1558 
1559 config THUMB2_KERNEL
1560         bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1561         depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1562         default y if CPU_THUMBONLY
1563         select AEABI
1564         select ARM_ASM_UNIFIED
1565         select ARM_UNWIND
1566         help
1567           By enabling this option, the kernel will be compiled in
1568           Thumb-2 mode. A compiler/assembler that understand the unified
1569           ARM-Thumb syntax is needed.
1570 
1571           If unsure, say N.
1572 
1573 config THUMB2_AVOID_R_ARM_THM_JUMP11
1574         bool "Work around buggy Thumb-2 short branch relocations in gas"
1575         depends on THUMB2_KERNEL && MODULES
1576         default y
1577         help
1578           Various binutils versions can resolve Thumb-2 branches to
1579           locally-defined, preemptible global symbols as short-range "b.n"
1580           branch instructions.
1581 
1582           This is a problem, because there's no guarantee the final
1583           destination of the symbol, or any candidate locations for a
1584           trampoline, are within range of the branch.  For this reason, the
1585           kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1586           relocation in modules at all, and it makes little sense to add
1587           support.
1588 
1589           The symptom is that the kernel fails with an "unsupported
1590           relocation" error when loading some modules.
1591 
1592           Until fixed tools are available, passing
1593           -fno-optimize-sibling-calls to gcc should prevent gcc generating
1594           code which hits this problem, at the cost of a bit of extra runtime
1595           stack usage in some cases.
1596 
1597           The problem is described in more detail at:
1598               https://bugs.launchpad.net/binutils-linaro/+bug/725126
1599 
1600           Only Thumb-2 kernels are affected.
1601 
1602           Unless you are sure your tools don't have this problem, say Y.
1603 
1604 config ARM_ASM_UNIFIED
1605         bool
1606 
1607 config AEABI
1608         bool "Use the ARM EABI to compile the kernel"
1609         help
1610           This option allows for the kernel to be compiled using the latest
1611           ARM ABI (aka EABI).  This is only useful if you are using a user
1612           space environment that is also compiled with EABI.
1613 
1614           Since there are major incompatibilities between the legacy ABI and
1615           EABI, especially with regard to structure member alignment, this
1616           option also changes the kernel syscall calling convention to
1617           disambiguate both ABIs and allow for backward compatibility support
1618           (selected with CONFIG_OABI_COMPAT).
1619 
1620           To use this you need GCC version 4.0.0 or later.
1621 
1622 config OABI_COMPAT
1623         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1624         depends on AEABI && !THUMB2_KERNEL
1625         help
1626           This option preserves the old syscall interface along with the
1627           new (ARM EABI) one. It also provides a compatibility layer to
1628           intercept syscalls that have structure arguments which layout
1629           in memory differs between the legacy ABI and the new ARM EABI
1630           (only for non "thumb" binaries). This option adds a tiny
1631           overhead to all syscalls and produces a slightly larger kernel.
1632 
1633           The seccomp filter system will not be available when this is
1634           selected, since there is no way yet to sensibly distinguish
1635           between calling conventions during filtering.
1636 
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 N.
1642 
1643 config ARCH_HAS_HOLES_MEMORYMODEL
1644         bool
1645 
1646 config ARCH_SPARSEMEM_ENABLE
1647         bool
1648 
1649 config ARCH_SPARSEMEM_DEFAULT
1650         def_bool ARCH_SPARSEMEM_ENABLE
1651 
1652 config ARCH_SELECT_MEMORY_MODEL
1653         def_bool ARCH_SPARSEMEM_ENABLE
1654 
1655 config HAVE_ARCH_PFN_VALID
1656         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1657 
1658 config HAVE_GENERIC_RCU_GUP
1659         def_bool y
1660         depends on ARM_LPAE
1661 
1662 config HIGHMEM
1663         bool "High Memory Support"
1664         depends on MMU
1665         help
1666           The address space of ARM processors is only 4 Gigabytes large
1667           and it has to accommodate user address space, kernel address
1668           space as well as some memory mapped IO. That means that, if you
1669           have a large amount of physical memory and/or IO, not all of the
1670           memory can be "permanently mapped" by the kernel. The physical
1671           memory that is not permanently mapped is called "high memory".
1672 
1673           Depending on the selected kernel/user memory split, minimum
1674           vmalloc space and actual amount of RAM, you may not need this
1675           option which should result in a slightly faster kernel.
1676 
1677           If unsure, say n.
1678 
1679 config HIGHPTE
1680         bool "Allocate 2nd-level pagetables from highmem" if EXPERT
1681         depends on HIGHMEM
1682         default y
1683         help
1684           The VM uses one page of physical memory for each page table.
1685           For systems with a lot of processes, this can use a lot of
1686           precious low memory, eventually leading to low memory being
1687           consumed by page tables.  Setting this option will allow
1688           user-space 2nd level page tables to reside in high memory.
1689 
1690 config CPU_SW_DOMAIN_PAN
1691         bool "Enable use of CPU domains to implement privileged no-access"
1692         depends on MMU && !ARM_LPAE
1693         default y
1694         help
1695           Increase kernel security by ensuring that normal kernel accesses
1696           are unable to access userspace addresses.  This can help prevent
1697           use-after-free bugs becoming an exploitable privilege escalation
1698           by ensuring that magic values (such as LIST_POISON) will always
1699           fault when dereferenced.
1700 
1701           CPUs with low-vector mappings use a best-efforts implementation.
1702           Their lower 1MB needs to remain accessible for the vectors, but
1703           the remainder of userspace will become appropriately inaccessible.
1704 
1705 config HW_PERF_EVENTS
1706         def_bool y
1707         depends on ARM_PMU
1708 
1709 config SYS_SUPPORTS_HUGETLBFS
1710        def_bool y
1711        depends on ARM_LPAE
1712 
1713 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1714        def_bool y
1715        depends on ARM_LPAE
1716 
1717 config ARCH_WANT_GENERAL_HUGETLB
1718         def_bool y
1719 
1720 config ARM_MODULE_PLTS
1721         bool "Use PLTs to allow module memory to spill over into vmalloc area"
1722         depends on MODULES
1723         help
1724           Allocate PLTs when loading modules so that jumps and calls whose
1725           targets are too far away for their relative offsets to be encoded
1726           in the instructions themselves can be bounced via veneers in the
1727           module's PLT. This allows modules to be allocated in the generic
1728           vmalloc area after the dedicated module memory area has been
1729           exhausted. The modules will use slightly more memory, but after
1730           rounding up to page size, the actual memory footprint is usually
1731           the same.
1732 
1733           Say y if you are getting out of memory errors while loading modules
1734 
1735 source "mm/Kconfig"
1736 
1737 config FORCE_MAX_ZONEORDER
1738         int "Maximum zone order"
1739         default "12" if SOC_AM33XX
1740         default "9" if SA1111 || ARCH_EFM32
1741         default "11"
1742         help
1743           The kernel memory allocator divides physically contiguous memory
1744           blocks into "zones", where each zone is a power of two number of
1745           pages.  This option selects the largest power of two that the kernel
1746           keeps in the memory allocator.  If you need to allocate very large
1747           blocks of physically contiguous memory, then you may need to
1748           increase this value.
1749 
1750           This config option is actually maximum order plus one. For example,
1751           a value of 11 means that the largest free memory block is 2^10 pages.
1752 
1753 config ALIGNMENT_TRAP
1754         bool
1755         depends on CPU_CP15_MMU
1756         default y if !ARCH_EBSA110
1757         select HAVE_PROC_CPU if PROC_FS
1758         help
1759           ARM processors cannot fetch/store information which is not
1760           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1761           address divisible by 4. On 32-bit ARM processors, these non-aligned
1762           fetch/store instructions will be emulated in software if you say
1763           here, which has a severe performance impact. This is necessary for
1764           correct operation of some network protocols. With an IP-only
1765           configuration it is safe to say N, otherwise say Y.
1766 
1767 config UACCESS_WITH_MEMCPY
1768         bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1769         depends on MMU
1770         default y if CPU_FEROCEON
1771         help
1772           Implement faster copy_to_user and clear_user methods for CPU
1773           cores where a 8-word STM instruction give significantly higher
1774           memory write throughput than a sequence of individual 32bit stores.
1775 
1776           A possible side effect is a slight increase in scheduling latency
1777           between threads sharing the same address space if they invoke
1778           such copy operations with large buffers.
1779 
1780           However, if the CPU data cache is using a write-allocate mode,
1781           this option is unlikely to provide any performance gain.
1782 
1783 config SECCOMP
1784         bool
1785         prompt "Enable seccomp to safely compute untrusted bytecode"
1786         ---help---
1787           This kernel feature is useful for number crunching applications
1788           that may need to compute untrusted bytecode during their
1789           execution. By using pipes or other transports made available to
1790           the process as file descriptors supporting the read/write
1791           syscalls, it's possible to isolate those applications in
1792           their own address space using seccomp. Once seccomp is
1793           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1794           and the task is only allowed to execute a few safe syscalls
1795           defined by each seccomp mode.
1796 
1797 config SWIOTLB
1798         def_bool y
1799 
1800 config IOMMU_HELPER
1801         def_bool SWIOTLB
1802 
1803 config XEN_DOM0
1804         def_bool y
1805         depends on XEN
1806 
1807 config XEN
1808         bool "Xen guest support on ARM"
1809         depends on ARM && AEABI && OF
1810         depends on CPU_V7 && !CPU_V6
1811         depends on !GENERIC_ATOMIC64
1812         depends on MMU
1813         select ARCH_DMA_ADDR_T_64BIT
1814         select ARM_PSCI
1815         select SWIOTLB_XEN
1816         help
1817           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1818 
1819 endmenu
1820 
1821 menu "Boot options"
1822 
1823 config USE_OF
1824         bool "Flattened Device Tree support"
1825         select IRQ_DOMAIN
1826         select OF
1827         help
1828           Include support for flattened device tree machine descriptions.
1829 
1830 config ATAGS
1831         bool "Support for the traditional ATAGS boot data passing" if USE_OF
1832         default y
1833         help
1834           This is the traditional way of passing data to the kernel at boot
1835           time. If you are solely relying on the flattened device tree (or
1836           the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1837           to remove ATAGS support from your kernel binary.  If unsure,
1838           leave this to y.
1839 
1840 config DEPRECATED_PARAM_STRUCT
1841         bool "Provide old way to pass kernel parameters"
1842         depends on ATAGS
1843         help
1844           This was deprecated in 2001 and announced to live on for 5 years.
1845           Some old boot loaders still use this way.
1846 
1847 # Compressed boot loader in ROM.  Yes, we really want to ask about
1848 # TEXT and BSS so we preserve their values in the config files.
1849 config ZBOOT_ROM_TEXT
1850         hex "Compressed ROM boot loader base address"
1851         default "0"
1852         help
1853           The physical address at which the ROM-able zImage is to be
1854           placed in the target.  Platforms which normally make use of
1855           ROM-able zImage formats normally set this to a suitable
1856           value in their defconfig file.
1857 
1858           If ZBOOT_ROM is not enabled, this has no effect.
1859 
1860 config ZBOOT_ROM_BSS
1861         hex "Compressed ROM boot loader BSS address"
1862         default "0"
1863         help
1864           The base address of an area of read/write memory in the target
1865           for the ROM-able zImage which must be available while the
1866           decompressor is running. It must be large enough to hold the
1867           entire decompressed kernel plus an additional 128 KiB.
1868           Platforms which normally make use of ROM-able zImage formats
1869           normally set this to a suitable value in their defconfig file.
1870 
1871           If ZBOOT_ROM is not enabled, this has no effect.
1872 
1873 config ZBOOT_ROM
1874         bool "Compressed boot loader in ROM/flash"
1875         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1876         depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1877         help
1878           Say Y here if you intend to execute your compressed kernel image
1879           (zImage) directly from ROM or flash.  If unsure, say N.
1880 
1881 config ARM_APPENDED_DTB
1882         bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1883         depends on OF
1884         help
1885           With this option, the boot code will look for a device tree binary
1886           (DTB) appended to zImage
1887           (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1888 
1889           This is meant as a backward compatibility convenience for those
1890           systems with a bootloader that can't be upgraded to accommodate
1891           the documented boot protocol using a device tree.
1892 
1893           Beware that there is very little in terms of protection against
1894           this option being confused by leftover garbage in memory that might
1895           look like a DTB header after a reboot if no actual DTB is appended
1896           to zImage.  Do not leave this option active in a production kernel
1897           if you don't intend to always append a DTB.  Proper passing of the
1898           location into r2 of a bootloader provided DTB is always preferable
1899           to this option.
1900 
1901 config ARM_ATAG_DTB_COMPAT
1902         bool "Supplement the appended DTB with traditional ATAG information"
1903         depends on ARM_APPENDED_DTB
1904         help
1905           Some old bootloaders can't be updated to a DTB capable one, yet
1906           they provide ATAGs with memory configuration, the ramdisk address,
1907           the kernel cmdline string, etc.  Such information is dynamically
1908           provided by the bootloader and can't always be stored in a static
1909           DTB.  To allow a device tree enabled kernel to be used with such
1910           bootloaders, this option allows zImage to extract the information
1911           from the ATAG list and store it at run time into the appended DTB.
1912 
1913 choice
1914         prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1915         default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1916 
1917 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1918         bool "Use bootloader kernel arguments if available"
1919         help
1920           Uses the command-line options passed by the boot loader instead of
1921           the device tree bootargs property. If the boot loader doesn't provide
1922           any, the device tree bootargs property will be used.
1923 
1924 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1925         bool "Extend with bootloader kernel arguments"
1926         help
1927           The command-line arguments provided by the boot loader will be
1928           appended to the the device tree bootargs property.
1929 
1930 endchoice
1931 
1932 config CMDLINE
1933         string "Default kernel command string"
1934         default ""
1935         help
1936           On some architectures (EBSA110 and CATS), there is currently no way
1937           for the boot loader to pass arguments to the kernel. For these
1938           architectures, you should supply some command-line options at build
1939           time by entering them here. As a minimum, you should specify the
1940           memory size and the root device (e.g., mem=64M root=/dev/nfs).
1941 
1942 choice
1943         prompt "Kernel command line type" if CMDLINE != ""
1944         default CMDLINE_FROM_BOOTLOADER
1945         depends on ATAGS
1946 
1947 config CMDLINE_FROM_BOOTLOADER
1948         bool "Use bootloader kernel arguments if available"
1949         help
1950           Uses the command-line options passed by the boot loader. If
1951           the boot loader doesn't provide any, the default kernel command
1952           string provided in CMDLINE will be used.
1953 
1954 config CMDLINE_EXTEND
1955         bool "Extend bootloader kernel arguments"
1956         help
1957           The command-line arguments provided by the boot loader will be
1958           appended to the default kernel command string.
1959 
1960 config CMDLINE_FORCE
1961         bool "Always use the default kernel command string"
1962         help
1963           Always use the default kernel command string, even if the boot
1964           loader passes other arguments to the kernel.
1965           This is useful if you cannot or don't want to change the
1966           command-line options your boot loader passes to the kernel.
1967 endchoice
1968 
1969 config XIP_KERNEL
1970         bool "Kernel Execute-In-Place from ROM"
1971         depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1972         help
1973           Execute-In-Place allows the kernel to run from non-volatile storage
1974           directly addressable by the CPU, such as NOR flash. This saves RAM
1975           space since the text section of the kernel is not loaded from flash
1976           to RAM.  Read-write sections, such as the data section and stack,
1977           are still copied to RAM.  The XIP kernel is not compressed since
1978           it has to run directly from flash, so it will take more space to
1979           store it.  The flash address used to link the kernel object files,
1980           and for storing it, is configuration dependent. Therefore, if you
1981           say Y here, you must know the proper physical address where to
1982           store the kernel image depending on your own flash memory usage.
1983 
1984           Also note that the make target becomes "make xipImage" rather than
1985           "make zImage" or "make Image".  The final kernel binary to put in
1986           ROM memory will be arch/arm/boot/xipImage.
1987 
1988           If unsure, say N.
1989 
1990 config XIP_PHYS_ADDR
1991         hex "XIP Kernel Physical Location"
1992         depends on XIP_KERNEL
1993         default "0x00080000"
1994         help
1995           This is the physical address in your flash memory the kernel will
1996           be linked for and stored to.  This address is dependent on your
1997           own flash usage.
1998 
1999 config KEXEC
2000         bool "Kexec system call (EXPERIMENTAL)"
2001         depends on (!SMP || PM_SLEEP_SMP)
2002         depends on !CPU_V7M
2003         select KEXEC_CORE
2004         help
2005           kexec is a system call that implements the ability to shutdown your
2006           current kernel, and to start another kernel.  It is like a reboot
2007           but it is independent of the system firmware.   And like a reboot
2008           you can start any kernel with it, not just Linux.
2009 
2010           It is an ongoing process to be certain the hardware in a machine
2011           is properly shutdown, so do not be surprised if this code does not
2012           initially work for you.
2013 
2014 config ATAGS_PROC
2015         bool "Export atags in procfs"
2016         depends on ATAGS && KEXEC
2017         default y
2018         help
2019           Should the atags used to boot the kernel be exported in an "atags"
2020           file in procfs. Useful with kexec.
2021 
2022 config CRASH_DUMP
2023         bool "Build kdump crash kernel (EXPERIMENTAL)"
2024         help
2025           Generate crash dump after being started by kexec. This should
2026           be normally only set in special crash dump kernels which are
2027           loaded in the main kernel with kexec-tools into a specially
2028           reserved region and then later executed after a crash by
2029           kdump/kexec. The crash dump kernel must be compiled to a
2030           memory address not used by the main kernel
2031 
2032           For more details see Documentation/kdump/kdump.txt
2033 
2034 config AUTO_ZRELADDR
2035         bool "Auto calculation of the decompressed kernel image address"
2036         help
2037           ZRELADDR is the physical address where the decompressed kernel
2038           image will be placed. If AUTO_ZRELADDR is selected, the address
2039           will be determined at run-time by masking the current IP with
2040           0xf8000000. This assumes the zImage being placed in the first 128MB
2041           from start of memory.
2042 
2043 endmenu
2044 
2045 menu "CPU Power Management"
2046 
2047 source "drivers/cpufreq/Kconfig"
2048 
2049 source "drivers/cpuidle/Kconfig"
2050 
2051 endmenu
2052 
2053 menu "Floating point emulation"
2054 
2055 comment "At least one emulation must be selected"
2056 
2057 config FPE_NWFPE
2058         bool "NWFPE math emulation"
2059         depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2060         ---help---
2061           Say Y to include the NWFPE floating point emulator in the kernel.
2062           This is necessary to run most binaries. Linux does not currently
2063           support floating point hardware so you need to say Y here even if
2064           your machine has an FPA or floating point co-processor podule.
2065 
2066           You may say N here if you are going to load the Acorn FPEmulator
2067           early in the bootup.
2068 
2069 config FPE_NWFPE_XP
2070         bool "Support extended precision"
2071         depends on FPE_NWFPE
2072         help
2073           Say Y to include 80-bit support in the kernel floating-point
2074           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
2075           Note that gcc does not generate 80-bit operations by default,
2076           so in most cases this option only enlarges the size of the
2077           floating point emulator without any good reason.
2078 
2079           You almost surely want to say N here.
2080 
2081 config FPE_FASTFPE
2082         bool "FastFPE math emulation (EXPERIMENTAL)"
2083         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2084         ---help---
2085           Say Y here to include the FAST floating point emulator in the kernel.
2086           This is an experimental much faster emulator which now also has full
2087           precision for the mantissa.  It does not support any exceptions.
2088           It is very simple, and approximately 3-6 times faster than NWFPE.
2089 
2090           It should be sufficient for most programs.  It may be not suitable
2091           for scientific calculations, but you have to check this for yourself.
2092           If you do not feel you need a faster FP emulation you should better
2093           choose NWFPE.
2094 
2095 config VFP
2096         bool "VFP-format floating point maths"
2097         depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2098         help
2099           Say Y to include VFP support code in the kernel. This is needed
2100           if your hardware includes a VFP unit.
2101 
2102           Please see <file:Documentation/arm/VFP/release-notes.txt> for
2103           release notes and additional status information.
2104 
2105           Say N if your target does not have VFP hardware.
2106 
2107 config VFPv3
2108         bool
2109         depends on VFP
2110         default y if CPU_V7
2111 
2112 config NEON
2113         bool "Advanced SIMD (NEON) Extension support"
2114         depends on VFPv3 && CPU_V7
2115         help
2116           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2117           Extension.
2118 
2119 config KERNEL_MODE_NEON
2120         bool "Support for NEON in kernel mode"
2121         depends on NEON && AEABI
2122         help
2123           Say Y to include support for NEON in kernel mode.
2124 
2125 endmenu
2126 
2127 menu "Userspace binary formats"
2128 
2129 source "fs/Kconfig.binfmt"
2130 
2131 endmenu
2132 
2133 menu "Power management options"
2134 
2135 source "kernel/power/Kconfig"
2136 
2137 config ARCH_SUSPEND_POSSIBLE
2138         depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2139                 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2140         def_bool y
2141 
2142 config ARM_CPU_SUSPEND
2143         def_bool PM_SLEEP
2144 
2145 config ARCH_HIBERNATION_POSSIBLE
2146         bool
2147         depends on MMU
2148         default y if ARCH_SUSPEND_POSSIBLE
2149 
2150 endmenu
2151 
2152 source "net/Kconfig"
2153 
2154 source "drivers/Kconfig"
2155 
2156 source "drivers/firmware/Kconfig"
2157 
2158 source "fs/Kconfig"
2159 
2160 source "arch/arm/Kconfig.debug"
2161 
2162 source "security/Kconfig"
2163 
2164 source "crypto/Kconfig"
2165 if CRYPTO
2166 source "arch/arm/crypto/Kconfig"
2167 endif
2168 
2169 source "lib/Kconfig"
2170 
2171 source "arch/arm/kvm/Kconfig"

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