arch/arm/Kconfig

   1 config ARM
   2         bool
   3         default y
   4         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
   5         select ARCH_HAS_DEVMEM_IS_ALLOWED
   6         select ARCH_HAS_ELF_RANDOMIZE
   7         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
   8         select ARCH_HAVE_CUSTOM_GPIO_H
   9         select ARCH_HAS_GCOV_PROFILE_ALL
  10         select ARCH_MIGHT_HAVE_PC_PARPORT
  11         select ARCH_SUPPORTS_ATOMIC_RMW
  12         select ARCH_USE_BUILTIN_BSWAP
  13         select ARCH_USE_CMPXCHG_LOCKREF
  14         select ARCH_WANT_IPC_PARSE_VERSION
  15         select BUILDTIME_EXTABLE_SORT if MMU
  16         select CLONE_BACKWARDS
  17         select CPU_PM if (SUSPEND || CPU_IDLE)
  18         select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
  19         select EDAC_SUPPORT
  20         select EDAC_ATOMIC_SCRUB
  21         select GENERIC_ALLOCATOR
  22         select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
  23         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  24         select GENERIC_EARLY_IOREMAP
  25         select GENERIC_IDLE_POLL_SETUP
  26         select GENERIC_IRQ_PROBE
  27         select GENERIC_IRQ_SHOW
  28         select GENERIC_IRQ_SHOW_LEVEL
  29         select GENERIC_PCI_IOMAP
  30         select GENERIC_SCHED_CLOCK
  31         select GENERIC_SMP_IDLE_THREAD
  32         select GENERIC_STRNCPY_FROM_USER
  33         select GENERIC_STRNLEN_USER
  34         select HANDLE_DOMAIN_IRQ
  35         select HARDIRQS_SW_RESEND
  36         select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
  37         select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
  38         select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
  39         select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
  40         select HAVE_ARCH_MMAP_RND_BITS if MMU
  41         select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
  42         select HAVE_ARCH_TRACEHOOK
  43         select HAVE_ARM_SMCCC if CPU_V7
  44         select HAVE_BPF_JIT
  45         select HAVE_CC_STACKPROTECTOR
  46         select HAVE_CONTEXT_TRACKING
  47         select HAVE_C_RECORDMCOUNT
  48         select HAVE_DEBUG_KMEMLEAK
  49         select HAVE_DMA_API_DEBUG
  50         select HAVE_DMA_CONTIGUOUS if MMU
  51         select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32 && MMU
  52         select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
  53         select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  54         select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  55         select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  56         select HAVE_GENERIC_DMA_COHERENT
  57         select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  58         select HAVE_IDE if PCI || ISA || PCMCIA
  59         select HAVE_IRQ_TIME_ACCOUNTING
  60         select HAVE_KERNEL_GZIP
  61         select HAVE_KERNEL_LZ4
  62         select HAVE_KERNEL_LZMA
  63         select HAVE_KERNEL_LZO
  64         select HAVE_KERNEL_XZ
  65         select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
  66         select HAVE_KRETPROBES if (HAVE_KPROBES)
  67         select HAVE_MEMBLOCK
  68         select HAVE_MOD_ARCH_SPECIFIC
  69         select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  70         select HAVE_OPTPROBES if !THUMB2_KERNEL
  71         select HAVE_PERF_EVENTS
  72         select HAVE_PERF_REGS
  73         select HAVE_PERF_USER_STACK_DUMP
  74         select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
  75         select HAVE_REGS_AND_STACK_ACCESS_API
  76         select HAVE_SYSCALL_TRACEPOINTS
  77         select HAVE_UID16
  78         select HAVE_VIRT_CPU_ACCOUNTING_GEN
  79         select IRQ_FORCED_THREADING
  80         select MODULES_USE_ELF_REL
  81         select NO_BOOTMEM
  82         select OF_EARLY_FLATTREE if OF
  83         select OF_RESERVED_MEM if OF
  84         select OLD_SIGACTION
  85         select OLD_SIGSUSPEND3
  86         select PERF_USE_VMALLOC
  87         select RTC_LIB
  88         select SYS_SUPPORTS_APM_EMULATION
  89         # Above selects are sorted alphabetically; please add new ones
  90         # according to that.  Thanks.
  91         help
  92           The ARM series is a line of low-power-consumption RISC chip designs
  93           licensed by ARM Ltd and targeted at embedded applications and
  94           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  95           manufactured, but legacy ARM-based PC hardware remains popular in
  96           Europe.  There is an ARM Linux project with a web page at
  97           <http://www.arm.linux.org.uk/>.
  98
  99 config ARM_HAS_SG_CHAIN
 100         select ARCH_HAS_SG_CHAIN
 101         bool
 102
 103 config NEED_SG_DMA_LENGTH
 104         bool
 105
 106 config ARM_DMA_USE_IOMMU
 107         bool
 108         select ARM_HAS_SG_CHAIN
 109         select NEED_SG_DMA_LENGTH
 110
 111 if ARM_DMA_USE_IOMMU
 112
 113 config ARM_DMA_IOMMU_ALIGNMENT
 114         int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
 115         range 4 9
 116         default 8
 117         help
 118           DMA mapping framework by default aligns all buffers to the smallest
 119           PAGE_SIZE order which is greater than or equal to the requested buffer
 120           size. This works well for buffers up to a few hundreds kilobytes, but
 121           for larger buffers it just a waste of address space. Drivers which has
 122           relatively small addressing window (like 64Mib) might run out of
 123           virtual space with just a few allocations.
 124
 125           With this parameter you can specify the maximum PAGE_SIZE order for
 126           DMA IOMMU buffers. Larger buffers will be aligned only to this
 127           specified order. The order is expressed as a power of two multiplied
 128           by the PAGE_SIZE.
 129
 130 endif
 131
 132 config MIGHT_HAVE_PCI
 133         bool
 134
 135 config SYS_SUPPORTS_APM_EMULATION
 136         bool
 137
 138 config HAVE_TCM
 139         bool
 140         select GENERIC_ALLOCATOR
 141
 142 config HAVE_PROC_CPU
 143         bool
 144
 145 config NO_IOPORT_MAP
 146         bool
 147
 148 config EISA
 149         bool
 150         ---help---
 151           The Extended Industry Standard Architecture (EISA) bus was
 152           developed as an open alternative to the IBM MicroChannel bus.
 153
 154           The EISA bus provided some of the features of the IBM MicroChannel
 155           bus while maintaining backward compatibility with cards made for
 156           the older ISA bus.  The EISA bus saw limited use between 1988 and
 157           1995 when it was made obsolete by the PCI bus.
 158
 159           Say Y here if you are building a kernel for an EISA-based machine.
 160
 161           Otherwise, say N.
 162
 163 config SBUS
 164         bool
 165
 166 config STACKTRACE_SUPPORT
 167         bool
 168         default y
 169
 170 config LOCKDEP_SUPPORT
 171         bool
 172         default y
 173
 174 config TRACE_IRQFLAGS_SUPPORT
 175         bool
 176         default !CPU_V7M
 177
 178 config RWSEM_XCHGADD_ALGORITHM
 179         bool
 180         default y
 181
 182 config ARCH_HAS_ILOG2_U32
 183         bool
 184
 185 config ARCH_HAS_ILOG2_U64
 186         bool
 187
 188 config ARCH_HAS_BANDGAP
 189         bool
 190
 191 config FIX_EARLYCON_MEM
 192         def_bool y if MMU
 193
 194 config GENERIC_HWEIGHT
 195         bool
 196         default y
 197
 198 config GENERIC_CALIBRATE_DELAY
 199         bool
 200         default y
 201
 202 config ARCH_MAY_HAVE_PC_FDC
 203         bool
 204
 205 config ZONE_DMA
 206         bool
 207
 208 config NEED_DMA_MAP_STATE
 209        def_bool y
 210
 211 config ARCH_SUPPORTS_UPROBES
 212         def_bool y
 213
 214 config ARCH_HAS_DMA_SET_COHERENT_MASK
 215         bool
 216
 217 config GENERIC_ISA_DMA
 218         bool
 219
 220 config FIQ
 221         bool
 222
 223 config NEED_RET_TO_USER
 224         bool
 225
 226 config ARCH_MTD_XIP
 227         bool
 228
 229 config VECTORS_BASE
 230         hex
 231         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 232         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 233         default 0x00000000
 234         help
 235           The base address of exception vectors.  This must be two pages
 236           in size.
 237
 238 config ARM_PATCH_PHYS_VIRT
 239         bool "Patch physical to virtual translations at runtime" if EMBEDDED
 240         default y
 241         depends on !XIP_KERNEL && MMU
 242         help
 243           Patch phys-to-virt and virt-to-phys translation functions at
 244           boot and module load time according to the position of the
 245           kernel in system memory.
 246
 247           This can only be used with non-XIP MMU kernels where the base
 248           of physical memory is at a 16MB boundary.
 249
 250           Only disable this option if you know that you do not require
 251           this feature (eg, building a kernel for a single machine) and
 252           you need to shrink the kernel to the minimal size.
 253
 254 config NEED_MACH_IO_H
 255         bool
 256         help
 257           Select this when mach/io.h is required to provide special
 258           definitions for this platform.  The need for mach/io.h should
 259           be avoided when possible.
 260
 261 config NEED_MACH_MEMORY_H
 262         bool
 263         help
 264           Select this when mach/memory.h is required to provide special
 265           definitions for this platform.  The need for mach/memory.h should
 266           be avoided when possible.
 267
 268 config PHYS_OFFSET
 269         hex "Physical address of main memory" if MMU
 270         depends on !ARM_PATCH_PHYS_VIRT
 271         default DRAM_BASE if !MMU
 272         default 0x00000000 if ARCH_EBSA110 || \
 273                         ARCH_FOOTBRIDGE || \
 274                         ARCH_INTEGRATOR || \
 275                         ARCH_IOP13XX || \
 276                         ARCH_KS8695 || \
 277                         (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
 278         default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
 279         default 0x20000000 if ARCH_S5PV210
 280         default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
 281         default 0xc0000000 if ARCH_SA1100
 282         help
 283           Please provide the physical address corresponding to the
 284           location of main memory in your system.
 285
 286 config GENERIC_BUG
 287         def_bool y
 288         depends on BUG
 289
 290 config PGTABLE_LEVELS
 291         int
 292         default 3 if ARM_LPAE
 293         default 2
 294
 295 source "init/Kconfig"
 296
 297 source "kernel/Kconfig.freezer"
 298
 299 menu "System Type"
 300
 301 config MMU
 302         bool "MMU-based Paged Memory Management Support"
 303         default y
 304         help
 305           Select if you want MMU-based virtualised addressing space
 306           support by paged memory management. If unsure, say 'Y'.
 307
 308 config ARCH_MMAP_RND_BITS_MIN
 309         default 8
 310
 311 config ARCH_MMAP_RND_BITS_MAX
 312         default 14 if PAGE_OFFSET=0x40000000
 313         default 15 if PAGE_OFFSET=0x80000000
 314         default 16
 315
 316 #
 317 # The "ARM system type" choice list is ordered alphabetically by option
 318 # text.  Please add new entries in the option alphabetic order.
 319 #
 320 choice
 321         prompt "ARM system type"
 322         default ARM_SINGLE_ARMV7M if !MMU
 323         default ARCH_MULTIPLATFORM if MMU
 324
 325 config ARCH_MULTIPLATFORM
 326         bool "Allow multiple platforms to be selected"
 327         depends on MMU
 328         select ARCH_WANT_OPTIONAL_GPIOLIB
 329         select ARM_HAS_SG_CHAIN
 330         select ARM_PATCH_PHYS_VIRT
 331         select AUTO_ZRELADDR
 332         select CLKSRC_OF
 333         select COMMON_CLK
 334         select GENERIC_CLOCKEVENTS
 335         select MIGHT_HAVE_PCI
 336         select MULTI_IRQ_HANDLER
 337         select SPARSE_IRQ
 338         select USE_OF
 339
 340 config ARM_SINGLE_ARMV7M
 341         bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
 342         depends on !MMU
 343         select ARCH_WANT_OPTIONAL_GPIOLIB
 344         select ARM_NVIC
 345         select AUTO_ZRELADDR
 346         select CLKSRC_OF
 347         select COMMON_CLK
 348         select CPU_V7M
 349         select GENERIC_CLOCKEVENTS
 350         select NO_IOPORT_MAP
 351         select SPARSE_IRQ
 352         select USE_OF
 353
 354
 355 config ARCH_CLPS711X
 356         bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
 357         select ARCH_REQUIRE_GPIOLIB
 358         select AUTO_ZRELADDR
 359         select CLKSRC_MMIO
 360         select COMMON_CLK
 361         select CPU_ARM720T
 362         select GENERIC_CLOCKEVENTS
 363         select MFD_SYSCON
 364         select SOC_BUS
 365         help
 366           Support for Cirrus Logic 711x/721x/731x based boards.
 367
 368 config ARCH_GEMINI
 369         bool "Cortina Systems Gemini"
 370         select ARCH_REQUIRE_GPIOLIB
 371         select CLKSRC_MMIO
 372         select CPU_FA526
 373         select GENERIC_CLOCKEVENTS
 374         help
 375           Support for the Cortina Systems Gemini family SoCs
 376
 377 config ARCH_EBSA110
 378         bool "EBSA-110"
 379         select ARCH_USES_GETTIMEOFFSET
 380         select CPU_SA110
 381         select ISA
 382         select NEED_MACH_IO_H
 383         select NEED_MACH_MEMORY_H
 384         select NO_IOPORT_MAP
 385         help
 386           This is an evaluation board for the StrongARM processor available
 387           from Digital. It has limited hardware on-board, including an
 388           Ethernet interface, two PCMCIA sockets, two serial ports and a
 389           parallel port.
 390
 391 config ARCH_EP93XX
 392         bool "EP93xx-based"
 393         select ARCH_HAS_HOLES_MEMORYMODEL
 394         select ARCH_REQUIRE_GPIOLIB
 395         select ARM_AMBA
 396         select ARM_PATCH_PHYS_VIRT
 397         select ARM_VIC
 398         select AUTO_ZRELADDR
 399         select CLKDEV_LOOKUP
 400         select CLKSRC_MMIO
 401         select CPU_ARM920T
 402         select GENERIC_CLOCKEVENTS
 403         help
 404           This enables support for the Cirrus EP93xx series of CPUs.
 405
 406 config ARCH_FOOTBRIDGE
 407         bool "FootBridge"
 408         select CPU_SA110
 409         select FOOTBRIDGE
 410         select GENERIC_CLOCKEVENTS
 411         select HAVE_IDE
 412         select NEED_MACH_IO_H if !MMU
 413         select NEED_MACH_MEMORY_H
 414         help
 415           Support for systems based on the DC21285 companion chip
 416           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 417
 418 config ARCH_NETX
 419         bool "Hilscher NetX based"
 420         select ARM_VIC
 421         select CLKSRC_MMIO
 422         select CPU_ARM926T
 423         select GENERIC_CLOCKEVENTS
 424         help
 425           This enables support for systems based on the Hilscher NetX Soc
 426
 427 config ARCH_IOP13XX
 428         bool "IOP13xx-based"
 429         depends on MMU
 430         select CPU_XSC3
 431         select NEED_MACH_MEMORY_H
 432         select NEED_RET_TO_USER
 433         select PCI
 434         select PLAT_IOP
 435         select VMSPLIT_1G
 436         select SPARSE_IRQ
 437         help
 438           Support for Intel's IOP13XX (XScale) family of processors.
 439
 440 config ARCH_IOP32X
 441         bool "IOP32x-based"
 442         depends on MMU
 443         select ARCH_REQUIRE_GPIOLIB
 444         select CPU_XSCALE
 445         select GPIO_IOP
 446         select NEED_RET_TO_USER
 447         select PCI
 448         select PLAT_IOP
 449         help
 450           Support for Intel's 80219 and IOP32X (XScale) family of
 451           processors.
 452
 453 config ARCH_IOP33X
 454         bool "IOP33x-based"
 455         depends on MMU
 456         select ARCH_REQUIRE_GPIOLIB
 457         select CPU_XSCALE
 458         select GPIO_IOP
 459         select NEED_RET_TO_USER
 460         select PCI
 461         select PLAT_IOP
 462         help
 463           Support for Intel's IOP33X (XScale) family of processors.
 464
 465 config ARCH_IXP4XX
 466         bool "IXP4xx-based"
 467         depends on MMU
 468         select ARCH_HAS_DMA_SET_COHERENT_MASK
 469         select ARCH_REQUIRE_GPIOLIB
 470         select ARCH_SUPPORTS_BIG_ENDIAN
 471         select CLKSRC_MMIO
 472         select CPU_XSCALE
 473         select DMABOUNCE if PCI
 474         select GENERIC_CLOCKEVENTS
 475         select MIGHT_HAVE_PCI
 476         select NEED_MACH_IO_H
 477         select USB_EHCI_BIG_ENDIAN_DESC
 478         select USB_EHCI_BIG_ENDIAN_MMIO
 479         help
 480           Support for Intel's IXP4XX (XScale) family of processors.
 481
 482 config ARCH_DOVE
 483         bool "Marvell Dove"
 484         select ARCH_REQUIRE_GPIOLIB
 485         select CPU_PJ4
 486         select GENERIC_CLOCKEVENTS
 487         select MIGHT_HAVE_PCI
 488         select MULTI_IRQ_HANDLER
 489         select MVEBU_MBUS
 490         select PINCTRL
 491         select PINCTRL_DOVE
 492         select PLAT_ORION_LEGACY
 493         select SPARSE_IRQ
 494         select PM_GENERIC_DOMAINS if PM
 495         help
 496           Support for the Marvell Dove SoC 88AP510
 497
 498 config ARCH_KS8695
 499         bool "Micrel/Kendin KS8695"
 500         select ARCH_REQUIRE_GPIOLIB
 501         select CLKSRC_MMIO
 502         select CPU_ARM922T
 503         select GENERIC_CLOCKEVENTS
 504         select NEED_MACH_MEMORY_H
 505         help
 506           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 507           System-on-Chip devices.
 508
 509 config ARCH_W90X900
 510         bool "Nuvoton W90X900 CPU"
 511         select ARCH_REQUIRE_GPIOLIB
 512         select CLKDEV_LOOKUP
 513         select CLKSRC_MMIO
 514         select CPU_ARM926T
 515         select GENERIC_CLOCKEVENTS
 516         help
 517           Support for Nuvoton (Winbond logic dept.) ARM9 processor,
 518           At present, the w90x900 has been renamed nuc900, regarding
 519           the ARM series product line, you can login the following
 520           link address to know more.
 521
 522           <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
 523                 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
 524
 525 config ARCH_LPC32XX
 526         bool "NXP LPC32XX"
 527         select ARCH_REQUIRE_GPIOLIB
 528         select ARM_AMBA
 529         select CLKDEV_LOOKUP
 530         select CLKSRC_LPC32XX
 531         select COMMON_CLK
 532         select CPU_ARM926T
 533         select GENERIC_CLOCKEVENTS
 534         select MULTI_IRQ_HANDLER
 535         select SPARSE_IRQ
 536         select USE_OF
 537         help
 538           Support for the NXP LPC32XX family of processors
 539
 540 config ARCH_PXA
 541         bool "PXA2xx/PXA3xx-based"
 542         depends on MMU
 543         select ARCH_MTD_XIP
 544         select ARCH_REQUIRE_GPIOLIB
 545         select ARM_CPU_SUSPEND if PM
 546         select AUTO_ZRELADDR
 547         select COMMON_CLK
 548         select CLKDEV_LOOKUP
 549         select CLKSRC_PXA
 550         select CLKSRC_MMIO
 551         select CLKSRC_OF
 552         select CPU_XSCALE if !CPU_XSC3
 553         select GENERIC_CLOCKEVENTS
 554         select GPIO_PXA
 555         select HAVE_IDE
 556         select IRQ_DOMAIN
 557         select MULTI_IRQ_HANDLER
 558         select PLAT_PXA
 559         select SPARSE_IRQ
 560         help
 561           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 562
 563 config ARCH_RPC
 564         bool "RiscPC"
 565         depends on MMU
 566         select ARCH_ACORN
 567         select ARCH_MAY_HAVE_PC_FDC
 568         select ARCH_SPARSEMEM_ENABLE
 569         select ARCH_USES_GETTIMEOFFSET
 570         select CPU_SA110
 571         select FIQ
 572         select HAVE_IDE
 573         select HAVE_PATA_PLATFORM
 574         select ISA_DMA_API
 575         select NEED_MACH_IO_H
 576         select NEED_MACH_MEMORY_H
 577         select NO_IOPORT_MAP
 578         help
 579           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 580           CD-ROM interface, serial and parallel port, and the floppy drive.
 581
 582 config ARCH_SA1100
 583         bool "SA1100-based"
 584         select ARCH_MTD_XIP
 585         select ARCH_REQUIRE_GPIOLIB
 586         select ARCH_SPARSEMEM_ENABLE
 587         select CLKDEV_LOOKUP
 588         select CLKSRC_MMIO
 589         select CLKSRC_PXA
 590         select CLKSRC_OF if OF
 591         select CPU_FREQ
 592         select CPU_SA1100
 593         select GENERIC_CLOCKEVENTS
 594         select HAVE_IDE
 595         select IRQ_DOMAIN
 596         select ISA
 597         select MULTI_IRQ_HANDLER
 598         select NEED_MACH_MEMORY_H
 599         select SPARSE_IRQ
 600         help
 601           Support for StrongARM 11x0 based boards.
 602
 603 config ARCH_S3C24XX
 604         bool "Samsung S3C24XX SoCs"
 605         select ARCH_REQUIRE_GPIOLIB
 606         select ATAGS
 607         select CLKDEV_LOOKUP
 608         select CLKSRC_SAMSUNG_PWM
 609         select GENERIC_CLOCKEVENTS
 610         select GPIO_SAMSUNG
 611         select HAVE_S3C2410_I2C if I2C
 612         select HAVE_S3C2410_WATCHDOG if WATCHDOG
 613         select HAVE_S3C_RTC if RTC_CLASS
 614         select MULTI_IRQ_HANDLER
 615         select NEED_MACH_IO_H
 616         select SAMSUNG_ATAGS
 617         help
 618           Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
 619           and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
 620           (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
 621           Samsung SMDK2410 development board (and derivatives).
 622
 623 config ARCH_DAVINCI
 624         bool "TI DaVinci"
 625         select ARCH_HAS_HOLES_MEMORYMODEL
 626         select ARCH_REQUIRE_GPIOLIB
 627         select CLKDEV_LOOKUP
 628         select CPU_ARM926T
 629         select GENERIC_ALLOCATOR
 630         select GENERIC_CLOCKEVENTS
 631         select GENERIC_IRQ_CHIP
 632         select HAVE_IDE
 633         select USE_OF
 634         select ZONE_DMA
 635         help
 636           Support for TI's DaVinci platform.
 637
 638 config ARCH_OMAP1
 639         bool "TI OMAP1"
 640         depends on MMU
 641         select ARCH_HAS_HOLES_MEMORYMODEL
 642         select ARCH_OMAP
 643         select ARCH_REQUIRE_GPIOLIB
 644         select CLKDEV_LOOKUP
 645         select CLKSRC_MMIO
 646         select GENERIC_CLOCKEVENTS
 647         select GENERIC_IRQ_CHIP
 648         select HAVE_IDE
 649         select IRQ_DOMAIN
 650         select MULTI_IRQ_HANDLER
 651         select NEED_MACH_IO_H if PCCARD
 652         select NEED_MACH_MEMORY_H
 653         select SPARSE_IRQ
 654         help
 655           Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
 656
 657 endchoice
 658
 659 menu "Multiple platform selection"
 660         depends on ARCH_MULTIPLATFORM
 661
 662 comment "CPU Core family selection"
 663
 664 config ARCH_MULTI_V4
 665         bool "ARMv4 based platforms (FA526)"
 666         depends on !ARCH_MULTI_V6_V7
 667         select ARCH_MULTI_V4_V5
 668         select CPU_FA526
 669
 670 config ARCH_MULTI_V4T
 671         bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
 672         depends on !ARCH_MULTI_V6_V7
 673         select ARCH_MULTI_V4_V5
 674         select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
 675                 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
 676                 CPU_ARM925T || CPU_ARM940T)
 677
 678 config ARCH_MULTI_V5
 679         bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
 680         depends on !ARCH_MULTI_V6_V7
 681         select ARCH_MULTI_V4_V5
 682         select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
 683                 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
 684                 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
 685
 686 config ARCH_MULTI_V4_V5
 687         bool
 688
 689 config ARCH_MULTI_V6
 690         bool "ARMv6 based platforms (ARM11)"
 691         select ARCH_MULTI_V6_V7
 692         select CPU_V6K
 693
 694 config ARCH_MULTI_V7
 695         bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
 696         default y
 697         select ARCH_MULTI_V6_V7
 698         select CPU_V7
 699         select HAVE_SMP
 700
 701 config ARCH_MULTI_V6_V7
 702         bool
 703         select MIGHT_HAVE_CACHE_L2X0
 704
 705 config ARCH_MULTI_CPU_AUTO
 706         def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
 707         select ARCH_MULTI_V5
 708
 709 endmenu
 710
 711 config ARCH_VIRT
 712         bool "Dummy Virtual Machine"
 713         depends on ARCH_MULTI_V7
 714         select ARM_AMBA
 715         select ARM_GIC
 716         select ARM_GIC_V2M if PCI_MSI
 717         select ARM_GIC_V3
 718         select ARM_PSCI
 719         select HAVE_ARM_ARCH_TIMER
 720
 721 #
 722 # This is sorted alphabetically by mach-* pathname.  However, plat-*
 723 # Kconfigs may be included either alphabetically (according to the
 724 # plat- suffix) or along side the corresponding mach-* source.
 725 #
 726 source "arch/arm/mach-mvebu/Kconfig"
 727
 728 source "arch/arm/mach-alpine/Kconfig"
 729
 730 source "arch/arm/mach-artpec/Kconfig"
 731
 732 source "arch/arm/mach-asm9260/Kconfig"
 733
 734 source "arch/arm/mach-at91/Kconfig"
 735
 736 source "arch/arm/mach-axxia/Kconfig"
 737
 738 source "arch/arm/mach-bcm/Kconfig"
 739
 740 source "arch/arm/mach-berlin/Kconfig"
 741
 742 source "arch/arm/mach-clps711x/Kconfig"
 743
 744 source "arch/arm/mach-cns3xxx/Kconfig"
 745
 746 source "arch/arm/mach-davinci/Kconfig"
 747
 748 source "arch/arm/mach-digicolor/Kconfig"
 749
 750 source "arch/arm/mach-dove/Kconfig"
 751
 752 source "arch/arm/mach-ep93xx/Kconfig"
 753
 754 source "arch/arm/mach-footbridge/Kconfig"
 755
 756 source "arch/arm/mach-gemini/Kconfig"
 757
 758 source "arch/arm/mach-highbank/Kconfig"
 759
 760 source "arch/arm/mach-hisi/Kconfig"
 761
 762 source "arch/arm/mach-integrator/Kconfig"
 763
 764 source "arch/arm/mach-iop32x/Kconfig"
 765
 766 source "arch/arm/mach-iop33x/Kconfig"
 767
 768 source "arch/arm/mach-iop13xx/Kconfig"
 769
 770 source "arch/arm/mach-ixp4xx/Kconfig"
 771
 772 source "arch/arm/mach-keystone/Kconfig"
 773
 774 source "arch/arm/mach-ks8695/Kconfig"
 775
 776 source "arch/arm/mach-meson/Kconfig"
 777
 778 source "arch/arm/mach-moxart/Kconfig"
 779
 780 source "arch/arm/mach-mv78xx0/Kconfig"
 781
 782 source "arch/arm/mach-imx/Kconfig"
 783
 784 source "arch/arm/mach-mediatek/Kconfig"
 785
 786 source "arch/arm/mach-mxs/Kconfig"
 787
 788 source "arch/arm/mach-netx/Kconfig"
 789
 790 source "arch/arm/mach-nomadik/Kconfig"
 791
 792 source "arch/arm/mach-nspire/Kconfig"
 793
 794 source "arch/arm/plat-omap/Kconfig"
 795
 796 source "arch/arm/mach-omap1/Kconfig"
 797
 798 source "arch/arm/mach-omap2/Kconfig"
 799
 800 source "arch/arm/mach-orion5x/Kconfig"
 801
 802 source "arch/arm/mach-picoxcell/Kconfig"
 803
 804 source "arch/arm/mach-pxa/Kconfig"
 805 source "arch/arm/plat-pxa/Kconfig"
 806
 807 source "arch/arm/mach-mmp/Kconfig"
 808
 809 source "arch/arm/mach-qcom/Kconfig"
 810
 811 source "arch/arm/mach-realview/Kconfig"
 812
 813 source "arch/arm/mach-rockchip/Kconfig"
 814
 815 source "arch/arm/mach-sa1100/Kconfig"
 816
 817 source "arch/arm/mach-socfpga/Kconfig"
 818
 819 source "arch/arm/mach-spear/Kconfig"
 820
 821 source "arch/arm/mach-sti/Kconfig"
 822
 823 source "arch/arm/mach-s3c24xx/Kconfig"
 824
 825 source "arch/arm/mach-s3c64xx/Kconfig"
 826
 827 source "arch/arm/mach-s5pv210/Kconfig"
 828
 829 source "arch/arm/mach-exynos/Kconfig"
 830 source "arch/arm/plat-samsung/Kconfig"
 831
 832 source "arch/arm/mach-shmobile/Kconfig"
 833
 834 source "arch/arm/mach-sunxi/Kconfig"
 835
 836 source "arch/arm/mach-prima2/Kconfig"
 837
 838 source "arch/arm/mach-tango/Kconfig"
 839
 840 source "arch/arm/mach-tegra/Kconfig"
 841
 842 source "arch/arm/mach-u300/Kconfig"
 843
 844 source "arch/arm/mach-uniphier/Kconfig"
 845
 846 source "arch/arm/mach-ux500/Kconfig"
 847
 848 source "arch/arm/mach-versatile/Kconfig"
 849
 850 source "arch/arm/mach-vexpress/Kconfig"
 851 source "arch/arm/plat-versatile/Kconfig"
 852
 853 source "arch/arm/mach-vt8500/Kconfig"
 854
 855 source "arch/arm/mach-w90x900/Kconfig"
 856
 857 source "arch/arm/mach-zx/Kconfig"
 858
 859 source "arch/arm/mach-zynq/Kconfig"
 860
 861 # ARMv7-M architecture
 862 config ARCH_EFM32
 863         bool "Energy Micro efm32"
 864         depends on ARM_SINGLE_ARMV7M
 865         select ARCH_REQUIRE_GPIOLIB
 866         help
 867           Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
 868           processors.
 869
 870 config ARCH_LPC18XX
 871         bool "NXP LPC18xx/LPC43xx"
 872         depends on ARM_SINGLE_ARMV7M
 873         select ARCH_HAS_RESET_CONTROLLER
 874         select ARM_AMBA
 875         select CLKSRC_LPC32XX
 876         select PINCTRL
 877         help
 878           Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
 879           high performance microcontrollers.
 880
 881 config ARCH_STM32
 882         bool "STMicrolectronics STM32"
 883         depends on ARM_SINGLE_ARMV7M
 884         select ARCH_HAS_RESET_CONTROLLER
 885         select ARMV7M_SYSTICK
 886         select CLKSRC_STM32
 887         select PINCTRL
 888         select RESET_CONTROLLER
 889         help
 890           Support for STMicroelectronics STM32 processors.
 891
 892 config MACH_STM32F429
 893         bool "STMicrolectronics STM32F429"
 894         depends on ARCH_STM32
 895         default y
 896
 897 # Definitions to make life easier
 898 config ARCH_ACORN
 899         bool
 900
 901 config PLAT_IOP
 902         bool
 903         select GENERIC_CLOCKEVENTS
 904
 905 config PLAT_ORION
 906         bool
 907         select CLKSRC_MMIO
 908         select COMMON_CLK
 909         select GENERIC_IRQ_CHIP
 910         select IRQ_DOMAIN
 911
 912 config PLAT_ORION_LEGACY
 913         bool
 914         select PLAT_ORION
 915
 916 config PLAT_PXA
 917         bool
 918
 919 config PLAT_VERSATILE
 920         bool
 921
 922 source "arch/arm/firmware/Kconfig"
 923
 924 source arch/arm/mm/Kconfig
 925
 926 config IWMMXT
 927         bool "Enable iWMMXt support"
 928         depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
 929         default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
 930         help
 931           Enable support for iWMMXt context switching at run time if
 932           running on a CPU that supports it.
 933
 934 config MULTI_IRQ_HANDLER
 935         bool
 936         help
 937           Allow each machine to specify it's own IRQ handler at run time.
 938
 939 if !MMU
 940 source "arch/arm/Kconfig-nommu"
 941 endif
 942
 943 config PJ4B_ERRATA_4742
 944         bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
 945         depends on CPU_PJ4B && MACH_ARMADA_370
 946         default y
 947         help
 948           When coming out of either a Wait for Interrupt (WFI) or a Wait for
 949           Event (WFE) IDLE states, a specific timing sensitivity exists between
 950           the retiring WFI/WFE instructions and the newly issued subsequent
 951           instructions.  This sensitivity can result in a CPU hang scenario.
 952           Workaround:
 953           The software must insert either a Data Synchronization Barrier (DSB)
 954           or Data Memory Barrier (DMB) command immediately after the WFI/WFE
 955           instruction
 956
 957 config ARM_ERRATA_326103
 958         bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
 959         depends on CPU_V6
 960         help
 961           Executing a SWP instruction to read-only memory does not set bit 11
 962           of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
 963           treat the access as a read, preventing a COW from occurring and
 964           causing the faulting task to livelock.
 965
 966 config ARM_ERRATA_411920
 967         bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
 968         depends on CPU_V6 || CPU_V6K
 969         help
 970           Invalidation of the Instruction Cache operation can
 971           fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
 972           It does not affect the MPCore. This option enables the ARM Ltd.
 973           recommended workaround.
 974
 975 config ARM_ERRATA_430973
 976         bool "ARM errata: Stale prediction on replaced interworking branch"
 977         depends on CPU_V7
 978         help
 979           This option enables the workaround for the 430973 Cortex-A8
 980           r1p* erratum. If a code sequence containing an ARM/Thumb
 981           interworking branch is replaced with another code sequence at the
 982           same virtual address, whether due to self-modifying code or virtual
 983           to physical address re-mapping, Cortex-A8 does not recover from the
 984           stale interworking branch prediction. This results in Cortex-A8
 985           executing the new code sequence in the incorrect ARM or Thumb state.
 986           The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
 987           and also flushes the branch target cache at every context switch.
 988           Note that setting specific bits in the ACTLR register may not be
 989           available in non-secure mode.
 990
 991 config ARM_ERRATA_458693
 992         bool "ARM errata: Processor deadlock when a false hazard is created"
 993         depends on CPU_V7
 994         depends on !ARCH_MULTIPLATFORM
 995         help
 996           This option enables the workaround for the 458693 Cortex-A8 (r2p0)
 997           erratum. For very specific sequences of memory operations, it is
 998           possible for a hazard condition intended for a cache line to instead
 999           be incorrectly associated with a different cache line. This false
1000           hazard might then cause a processor deadlock. The workaround enables
1001           the L1 caching of the NEON accesses and disables the PLD instruction
1002           in the ACTLR register. Note that setting specific bits in the ACTLR
1003           register may not be available in non-secure mode.
1004
1005 config ARM_ERRATA_460075
1006         bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1007         depends on CPU_V7
1008         depends on !ARCH_MULTIPLATFORM
1009         help
1010           This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1011           erratum. Any asynchronous access to the L2 cache may encounter a
1012           situation in which recent store transactions to the L2 cache are lost
1013           and overwritten with stale memory contents from external memory. The
1014           workaround disables the write-allocate mode for the L2 cache via the
1015           ACTLR register. Note that setting specific bits in the ACTLR register
1016           may not be available in non-secure mode.
1017
1018 config ARM_ERRATA_742230
1019         bool "ARM errata: DMB operation may be faulty"
1020         depends on CPU_V7 && SMP
1021         depends on !ARCH_MULTIPLATFORM
1022         help
1023           This option enables the workaround for the 742230 Cortex-A9
1024           (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1025           between two write operations may not ensure the correct visibility
1026           ordering of the two writes. This workaround sets a specific bit in
1027           the diagnostic register of the Cortex-A9 which causes the DMB
1028           instruction to behave as a DSB, ensuring the correct behaviour of
1029           the two writes.
1030
1031 config ARM_ERRATA_742231
1032         bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1033         depends on CPU_V7 && SMP
1034         depends on !ARCH_MULTIPLATFORM
1035         help
1036           This option enables the workaround for the 742231 Cortex-A9
1037           (r2p0..r2p2) erratum. Under certain conditions, specific to the
1038           Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1039           accessing some data located in the same cache line, may get corrupted
1040           data due to bad handling of the address hazard when the line gets
1041           replaced from one of the CPUs at the same time as another CPU is
1042           accessing it. This workaround sets specific bits in the diagnostic
1043           register of the Cortex-A9 which reduces the linefill issuing
1044           capabilities of the processor.
1045
1046 config ARM_ERRATA_643719
1047         bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1048         depends on CPU_V7 && SMP
1049         default y
1050         help
1051           This option enables the workaround for the 643719 Cortex-A9 (prior to
1052           r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1053           register returns zero when it should return one. The workaround
1054           corrects this value, ensuring cache maintenance operations which use
1055           it behave as intended and avoiding data corruption.
1056
1057 config ARM_ERRATA_720789
1058         bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1059         depends on CPU_V7
1060         help
1061           This option enables the workaround for the 720789 Cortex-A9 (prior to
1062           r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1063           broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1064           As a consequence of this erratum, some TLB entries which should be
1065           invalidated are not, resulting in an incoherency in the system page
1066           tables. The workaround changes the TLB flushing routines to invalidate
1067           entries regardless of the ASID.
1068
1069 config ARM_ERRATA_743622
1070         bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1071         depends on CPU_V7
1072         depends on !ARCH_MULTIPLATFORM
1073         help
1074           This option enables the workaround for the 743622 Cortex-A9
1075           (r2p*) erratum. Under very rare conditions, a faulty
1076           optimisation in the Cortex-A9 Store Buffer may lead to data
1077           corruption. This workaround sets a specific bit in the diagnostic
1078           register of the Cortex-A9 which disables the Store Buffer
1079           optimisation, preventing the defect from occurring. This has no
1080           visible impact on the overall performance or power consumption of the
1081           processor.
1082
1083 config ARM_ERRATA_751472
1084         bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1085         depends on CPU_V7
1086         depends on !ARCH_MULTIPLATFORM
1087         help
1088           This option enables the workaround for the 751472 Cortex-A9 (prior
1089           to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1090           completion of a following broadcasted operation if the second
1091           operation is received by a CPU before the ICIALLUIS has completed,
1092           potentially leading to corrupted entries in the cache or TLB.
1093
1094 config ARM_ERRATA_754322
1095         bool "ARM errata: possible faulty MMU translations following an ASID switch"
1096         depends on CPU_V7
1097         help
1098           This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1099           r3p*) erratum. A speculative memory access may cause a page table walk
1100           which starts prior to an ASID switch but completes afterwards. This
1101           can populate the micro-TLB with a stale entry which may be hit with
1102           the new ASID. This workaround places two dsb instructions in the mm
1103           switching code so that no page table walks can cross the ASID switch.
1104
1105 config ARM_ERRATA_754327
1106         bool "ARM errata: no automatic Store Buffer drain"
1107         depends on CPU_V7 && SMP
1108         help
1109           This option enables the workaround for the 754327 Cortex-A9 (prior to
1110           r2p0) erratum. The Store Buffer does not have any automatic draining
1111           mechanism and therefore a livelock may occur if an external agent
1112           continuously polls a memory location waiting to observe an update.
1113           This workaround defines cpu_relax() as smp_mb(), preventing correctly
1114           written polling loops from denying visibility of updates to memory.
1115
1116 config ARM_ERRATA_364296
1117         bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1118         depends on CPU_V6
1119         help
1120           This options enables the workaround for the 364296 ARM1136
1121           r0p2 erratum (possible cache data corruption with
1122           hit-under-miss enabled). It sets the undocumented bit 31 in
1123           the auxiliary control register and the FI bit in the control
1124           register, thus disabling hit-under-miss without putting the
1125           processor into full low interrupt latency mode. ARM11MPCore
1126           is not affected.
1127
1128 config ARM_ERRATA_764369
1129         bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1130         depends on CPU_V7 && SMP
1131         help
1132           This option enables the workaround for erratum 764369
1133           affecting Cortex-A9 MPCore with two or more processors (all
1134           current revisions). Under certain timing circumstances, a data
1135           cache line maintenance operation by MVA targeting an Inner
1136           Shareable memory region may fail to proceed up to either the
1137           Point of Coherency or to the Point of Unification of the
1138           system. This workaround adds a DSB instruction before the
1139           relevant cache maintenance functions and sets a specific bit
1140           in the diagnostic control register of the SCU.
1141
1142 config ARM_ERRATA_775420
1143        bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1144        depends on CPU_V7
1145        help
1146          This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1147          r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1148          operation aborts with MMU exception, it might cause the processor
1149          to deadlock. This workaround puts DSB before executing ISB if
1150          an abort may occur on cache maintenance.
1151
1152 config ARM_ERRATA_798181
1153         bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1154         depends on CPU_V7 && SMP
1155         help
1156           On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1157           adequately shooting down all use of the old entries. This
1158           option enables the Linux kernel workaround for this erratum
1159           which sends an IPI to the CPUs that are running the same ASID
1160           as the one being invalidated.
1161
1162 config ARM_ERRATA_773022
1163         bool "ARM errata: incorrect instructions may be executed from loop buffer"
1164         depends on CPU_V7
1165         help
1166           This option enables the workaround for the 773022 Cortex-A15
1167           (up to r0p4) erratum. In certain rare sequences of code, the
1168           loop buffer may deliver incorrect instructions. This
1169           workaround disables the loop buffer to avoid the erratum.
1170
1171 endmenu
1172
1173 source "arch/arm/common/Kconfig"
1174
1175 menu "Bus support"
1176
1177 config ISA
1178         bool
1179         help
1180           Find out whether you have ISA slots on your motherboard.  ISA is the
1181           name of a bus system, i.e. the way the CPU talks to the other stuff
1182           inside your box.  Other bus systems are PCI, EISA, MicroChannel
1183           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1184           newer boards don't support it.  If you have ISA, say Y, otherwise N.
1185
1186 # Select ISA DMA controller support
1187 config ISA_DMA
1188         bool
1189         select ISA_DMA_API
1190
1191 # Select ISA DMA interface
1192 config ISA_DMA_API
1193         bool
1194
1195 config PCI
1196         bool "PCI support" if MIGHT_HAVE_PCI
1197         help
1198           Find out whether you have a PCI motherboard. PCI is the name of a
1199           bus system, i.e. the way the CPU talks to the other stuff inside
1200           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1201           VESA. If you have PCI, say Y, otherwise N.
1202
1203 config PCI_DOMAINS
1204         bool
1205         depends on PCI
1206
1207 config PCI_DOMAINS_GENERIC
1208         def_bool PCI_DOMAINS
1209
1210 config PCI_NANOENGINE
1211         bool "BSE nanoEngine PCI support"
1212         depends on SA1100_NANOENGINE
1213         help
1214           Enable PCI on the BSE nanoEngine board.
1215
1216 config PCI_SYSCALL
1217         def_bool PCI
1218
1219 config PCI_HOST_ITE8152
1220         bool
1221         depends on PCI && MACH_ARMCORE
1222         default y
1223         select DMABOUNCE
1224
1225 source "drivers/pci/Kconfig"
1226
1227 source "drivers/pcmcia/Kconfig"
1228
1229 endmenu
1230
1231 menu "Kernel Features"
1232
1233 config HAVE_SMP
1234         bool
1235         help
1236           This option should be selected by machines which have an SMP-
1237           capable CPU.
1238
1239           The only effect of this option is to make the SMP-related
1240           options available to the user for configuration.
1241
1242 config SMP
1243         bool "Symmetric Multi-Processing"
1244         depends on CPU_V6K || CPU_V7
1245         depends on GENERIC_CLOCKEVENTS
1246         depends on HAVE_SMP
1247         depends on MMU || ARM_MPU
1248         select IRQ_WORK
1249         help
1250           This enables support for systems with more than one CPU. If you have
1251           a system with only one CPU, say N. If you have a system with more
1252           than one CPU, say Y.
1253
1254           If you say N here, the kernel will run on uni- and multiprocessor
1255           machines, but will use only one CPU of a multiprocessor machine. If
1256           you say Y here, the kernel will run on many, but not all,
1257           uniprocessor machines. On a uniprocessor machine, the kernel
1258           will run faster if you say N here.
1259
1260           See also <file:Documentation/x86/i386/IO-APIC.txt>,
1261           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1262           <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1263
1264           If you don't know what to do here, say N.
1265
1266 config SMP_ON_UP
1267         bool "Allow booting SMP kernel on uniprocessor systems"
1268         depends on SMP && !XIP_KERNEL && MMU
1269         default y
1270         help
1271           SMP kernels contain instructions which fail on non-SMP processors.
1272           Enabling this option allows the kernel to modify itself to make
1273           these instructions safe.  Disabling it allows about 1K of space
1274           savings.
1275
1276           If you don't know what to do here, say Y.
1277
1278 config ARM_CPU_TOPOLOGY
1279         bool "Support cpu topology definition"
1280         depends on SMP && CPU_V7
1281         default y
1282         help
1283           Support ARM cpu topology definition. The MPIDR register defines
1284           affinity between processors which is then used to describe the cpu
1285           topology of an ARM System.
1286
1287 config SCHED_MC
1288         bool "Multi-core scheduler support"
1289         depends on ARM_CPU_TOPOLOGY
1290         help
1291           Multi-core scheduler support improves the CPU scheduler's decision
1292           making when dealing with multi-core CPU chips at a cost of slightly
1293           increased overhead in some places. If unsure say N here.
1294
1295 config SCHED_SMT
1296         bool "SMT scheduler support"
1297         depends on ARM_CPU_TOPOLOGY
1298         help
1299           Improves the CPU scheduler's decision making when dealing with
1300           MultiThreading at a cost of slightly increased overhead in some
1301           places. If unsure say N here.
1302
1303 config HAVE_ARM_SCU
1304         bool
1305         help
1306           This option enables support for the ARM system coherency unit
1307
1308 config HAVE_ARM_ARCH_TIMER
1309         bool "Architected timer support"
1310         depends on CPU_V7
1311         select ARM_ARCH_TIMER
1312         select GENERIC_CLOCKEVENTS
1313         help
1314           This option enables support for the ARM architected timer
1315
1316 config HAVE_ARM_TWD
1317         bool
1318         select CLKSRC_OF if OF
1319         help
1320           This options enables support for the ARM timer and watchdog unit
1321
1322 config MCPM
1323         bool "Multi-Cluster Power Management"
1324         depends on CPU_V7 && SMP
1325         help
1326           This option provides the common power management infrastructure
1327           for (multi-)cluster based systems, such as big.LITTLE based
1328           systems.
1329
1330 config MCPM_QUAD_CLUSTER
1331         bool
1332         depends on MCPM
1333         help
1334           To avoid wasting resources unnecessarily, MCPM only supports up
1335           to 2 clusters by default.
1336           Platforms with 3 or 4 clusters that use MCPM must select this
1337           option to allow the additional clusters to be managed.
1338
1339 config BIG_LITTLE
1340         bool "big.LITTLE support (Experimental)"
1341         depends on CPU_V7 && SMP
1342         select MCPM
1343         help
1344           This option enables support selections for the big.LITTLE
1345           system architecture.
1346
1347 config BL_SWITCHER
1348         bool "big.LITTLE switcher support"
1349         depends on BIG_LITTLE && MCPM && HOTPLUG_CPU && ARM_GIC
1350         select CPU_PM
1351         help
1352           The big.LITTLE "switcher" provides the core functionality to
1353           transparently handle transition between a cluster of A15's
1354           and a cluster of A7's in a big.LITTLE system.
1355
1356 config BL_SWITCHER_DUMMY_IF
1357         tristate "Simple big.LITTLE switcher user interface"
1358         depends on BL_SWITCHER && DEBUG_KERNEL
1359         help
1360           This is a simple and dummy char dev interface to control
1361           the big.LITTLE switcher core code.  It is meant for
1362           debugging purposes only.
1363
1364 choice
1365         prompt "Memory split"
1366         depends on MMU
1367         default VMSPLIT_3G
1368         help
1369           Select the desired split between kernel and user memory.
1370
1371           If you are not absolutely sure what you are doing, leave this
1372           option alone!
1373
1374         config VMSPLIT_3G
1375                 bool "3G/1G user/kernel split"
1376         config VMSPLIT_3G_OPT
1377                 bool "3G/1G user/kernel split (for full 1G low memory)"
1378         config VMSPLIT_2G
1379                 bool "2G/2G user/kernel split"
1380         config VMSPLIT_1G
1381                 bool "1G/3G user/kernel split"
1382 endchoice
1383
1384 config PAGE_OFFSET
1385         hex
1386         default PHYS_OFFSET if !MMU
1387         default 0x40000000 if VMSPLIT_1G
1388         default 0x80000000 if VMSPLIT_2G
1389         default 0xB0000000 if VMSPLIT_3G_OPT
1390         default 0xC0000000
1391
1392 config NR_CPUS
1393         int "Maximum number of CPUs (2-32)"
1394         range 2 32
1395         depends on SMP
1396         default "4"
1397
1398 config HOTPLUG_CPU
1399         bool "Support for hot-pluggable CPUs"
1400         depends on SMP
1401         help
1402           Say Y here to experiment with turning CPUs off and on.  CPUs
1403           can be controlled through /sys/devices/system/cpu.
1404
1405 config ARM_PSCI
1406         bool "Support for the ARM Power State Coordination Interface (PSCI)"
1407         depends on HAVE_ARM_SMCCC
1408         select ARM_PSCI_FW
1409         help
1410           Say Y here if you want Linux to communicate with system firmware
1411           implementing the PSCI specification for CPU-centric power
1412           management operations described in ARM document number ARM DEN
1413           0022A ("Power State Coordination Interface System Software on
1414           ARM processors").
1415
1416 # The GPIO number here must be sorted by descending number. In case of
1417 # a multiplatform kernel, we just want the highest value required by the
1418 # selected platforms.
1419 config ARCH_NR_GPIO
1420         int
1421         default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1422                 ARCH_ZYNQ
1423         default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1424                 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1425         default 416 if ARCH_SUNXI
1426         default 392 if ARCH_U8500
1427         default 352 if ARCH_VT8500
1428         default 288 if ARCH_ROCKCHIP
1429         default 264 if MACH_H4700
1430         default 0
1431         help
1432           Maximum number of GPIOs in the system.
1433
1434           If unsure, leave the default value.
1435
1436 source kernel/Kconfig.preempt
1437
1438 config HZ_FIXED
1439         int
1440         default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1441                 ARCH_S5PV210 || ARCH_EXYNOS4
1442         default 128 if SOC_AT91RM9200
1443         default 0
1444
1445 choice
1446         depends on HZ_FIXED = 0
1447         prompt "Timer frequency"
1448
1449 config HZ_100
1450         bool "100 Hz"
1451
1452 config HZ_200
1453         bool "200 Hz"
1454
1455 config HZ_250
1456         bool "250 Hz"
1457
1458 config HZ_300
1459         bool "300 Hz"
1460
1461 config HZ_500
1462         bool "500 Hz"
1463
1464 config HZ_1000
1465         bool "1000 Hz"
1466
1467 endchoice
1468
1469 config HZ
1470         int
1471         default HZ_FIXED if HZ_FIXED != 0
1472         default 100 if HZ_100
1473         default 200 if HZ_200
1474         default 250 if HZ_250
1475         default 300 if HZ_300
1476         default 500 if HZ_500
1477         default 1000
1478
1479 config SCHED_HRTICK
1480         def_bool HIGH_RES_TIMERS
1481
1482 config THUMB2_KERNEL
1483         bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1484         depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1485         default y if CPU_THUMBONLY
1486         select AEABI
1487         select ARM_ASM_UNIFIED
1488         select ARM_UNWIND
1489         help
1490           By enabling this option, the kernel will be compiled in
1491           Thumb-2 mode. A compiler/assembler that understand the unified
1492           ARM-Thumb syntax is needed.
1493
1494           If unsure, say N.
1495
1496 config THUMB2_AVOID_R_ARM_THM_JUMP11
1497         bool "Work around buggy Thumb-2 short branch relocations in gas"
1498         depends on THUMB2_KERNEL && MODULES
1499         default y
1500         help
1501           Various binutils versions can resolve Thumb-2 branches to
1502           locally-defined, preemptible global symbols as short-range "b.n"
1503           branch instructions.
1504
1505           This is a problem, because there's no guarantee the final
1506           destination of the symbol, or any candidate locations for a
1507           trampoline, are within range of the branch.  For this reason, the
1508           kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1509           relocation in modules at all, and it makes little sense to add
1510           support.
1511
1512           The symptom is that the kernel fails with an "unsupported
1513           relocation" error when loading some modules.
1514
1515           Until fixed tools are available, passing
1516           -fno-optimize-sibling-calls to gcc should prevent gcc generating
1517           code which hits this problem, at the cost of a bit of extra runtime
1518           stack usage in some cases.
1519
1520           The problem is described in more detail at:
1521               https://bugs.launchpad.net/binutils-linaro/+bug/725126
1522
1523           Only Thumb-2 kernels are affected.
1524
1525           Unless you are sure your tools don't have this problem, say Y.
1526
1527 config ARM_ASM_UNIFIED
1528         bool
1529
1530 config ARM_PATCH_IDIV
1531         bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()"
1532         depends on CPU_32v7 && !XIP_KERNEL
1533         default y
1534         help
1535           The ARM compiler inserts calls to __aeabi_idiv() and
1536           __aeabi_uidiv() when it needs to perform division on signed
1537           and unsigned integers. Some v7 CPUs have support for the sdiv
1538           and udiv instructions that can be used to implement those
1539           functions.
1540
1541           Enabling this option allows the kernel to modify itself to
1542           replace the first two instructions of these library functions
1543           with the sdiv or udiv plus "bx lr" instructions when the CPU
1544           it is running on supports them. Typically this will be faster
1545           and less power intensive than running the original library
1546           code to do integer division.
1547
1548 config AEABI
1549         bool "Use the ARM EABI to compile the kernel"
1550         help
1551           This option allows for the kernel to be compiled using the latest
1552           ARM ABI (aka EABI).  This is only useful if you are using a user
1553           space environment that is also compiled with EABI.
1554
1555           Since there are major incompatibilities between the legacy ABI and
1556           EABI, especially with regard to structure member alignment, this
1557           option also changes the kernel syscall calling convention to
1558           disambiguate both ABIs and allow for backward compatibility support
1559           (selected with CONFIG_OABI_COMPAT).
1560
1561           To use this you need GCC version 4.0.0 or later.
1562
1563 config OABI_COMPAT
1564         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1565         depends on AEABI && !THUMB2_KERNEL
1566         help
1567           This option preserves the old syscall interface along with the
1568           new (ARM EABI) one. It also provides a compatibility layer to
1569           intercept syscalls that have structure arguments which layout
1570           in memory differs between the legacy ABI and the new ARM EABI
1571           (only for non "thumb" binaries). This option adds a tiny
1572           overhead to all syscalls and produces a slightly larger kernel.
1573
1574           The seccomp filter system will not be available when this is
1575           selected, since there is no way yet to sensibly distinguish
1576           between calling conventions during filtering.
1577
1578           If you know you'll be using only pure EABI user space then you
1579           can say N here. If this option is not selected and you attempt
1580           to execute a legacy ABI binary then the result will be
1581           UNPREDICTABLE (in fact it can be predicted that it won't work
1582           at all). If in doubt say N.
1583
1584 config ARCH_HAS_HOLES_MEMORYMODEL
1585         bool
1586
1587 config ARCH_SPARSEMEM_ENABLE
1588         bool
1589
1590 config ARCH_SPARSEMEM_DEFAULT
1591         def_bool ARCH_SPARSEMEM_ENABLE
1592
1593 config ARCH_SELECT_MEMORY_MODEL
1594         def_bool ARCH_SPARSEMEM_ENABLE
1595
1596 config HAVE_ARCH_PFN_VALID
1597         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1598
1599 config HAVE_GENERIC_RCU_GUP
1600         def_bool y
1601         depends on ARM_LPAE
1602
1603 config HIGHMEM
1604         bool "High Memory Support"
1605         depends on MMU
1606         help
1607           The address space of ARM processors is only 4 Gigabytes large
1608           and it has to accommodate user address space, kernel address
1609           space as well as some memory mapped IO. That means that, if you
1610           have a large amount of physical memory and/or IO, not all of the
1611           memory can be "permanently mapped" by the kernel. The physical
1612           memory that is not permanently mapped is called "high memory".
1613
1614           Depending on the selected kernel/user memory split, minimum
1615           vmalloc space and actual amount of RAM, you may not need this
1616           option which should result in a slightly faster kernel.
1617
1618           If unsure, say n.
1619
1620 config HIGHPTE
1621         bool "Allocate 2nd-level pagetables from highmem" if EXPERT
1622         depends on HIGHMEM
1623         default y
1624         help
1625           The VM uses one page of physical memory for each page table.
1626           For systems with a lot of processes, this can use a lot of
1627           precious low memory, eventually leading to low memory being
1628           consumed by page tables.  Setting this option will allow
1629           user-space 2nd level page tables to reside in high memory.
1630
1631 config CPU_SW_DOMAIN_PAN
1632         bool "Enable use of CPU domains to implement privileged no-access"
1633         depends on MMU && !ARM_LPAE
1634         default y
1635         help
1636           Increase kernel security by ensuring that normal kernel accesses
1637           are unable to access userspace addresses.  This can help prevent
1638           use-after-free bugs becoming an exploitable privilege escalation
1639           by ensuring that magic values (such as LIST_POISON) will always
1640           fault when dereferenced.
1641
1642           CPUs with low-vector mappings use a best-efforts implementation.
1643           Their lower 1MB needs to remain accessible for the vectors, but
1644           the remainder of userspace will become appropriately inaccessible.
1645
1646 config HW_PERF_EVENTS
1647         def_bool y
1648         depends on ARM_PMU
1649
1650 config SYS_SUPPORTS_HUGETLBFS
1651        def_bool y
1652        depends on ARM_LPAE
1653
1654 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1655        def_bool y
1656        depends on ARM_LPAE
1657
1658 config ARCH_WANT_GENERAL_HUGETLB
1659         def_bool y
1660
1661 config ARM_MODULE_PLTS
1662         bool "Use PLTs to allow module memory to spill over into vmalloc area"
1663         depends on MODULES
1664         help
1665           Allocate PLTs when loading modules so that jumps and calls whose
1666           targets are too far away for their relative offsets to be encoded
1667           in the instructions themselves can be bounced via veneers in the
1668           module's PLT. This allows modules to be allocated in the generic
1669           vmalloc area after the dedicated module memory area has been
1670           exhausted. The modules will use slightly more memory, but after
1671           rounding up to page size, the actual memory footprint is usually
1672           the same.
1673
1674           Say y if you are getting out of memory errors while loading modules
1675
1676 source "mm/Kconfig"
1677
1678 config FORCE_MAX_ZONEORDER
1679         int "Maximum zone order"
1680         default "12" if SOC_AM33XX
1681         default "9" if SA1111 || ARCH_EFM32
1682         default "11"
1683         help
1684           The kernel memory allocator divides physically contiguous memory
1685           blocks into "zones", where each zone is a power of two number of
1686           pages.  This option selects the largest power of two that the kernel
1687           keeps in the memory allocator.  If you need to allocate very large
1688           blocks of physically contiguous memory, then you may need to
1689           increase this value.
1690
1691           This config option is actually maximum order plus one. For example,
1692           a value of 11 means that the largest free memory block is 2^10 pages.
1693
1694 config ALIGNMENT_TRAP
1695         bool
1696         depends on CPU_CP15_MMU
1697         default y if !ARCH_EBSA110
1698         select HAVE_PROC_CPU if PROC_FS
1699         help
1700           ARM processors cannot fetch/store information which is not
1701           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1702           address divisible by 4. On 32-bit ARM processors, these non-aligned
1703           fetch/store instructions will be emulated in software if you say
1704           here, which has a severe performance impact. This is necessary for
1705           correct operation of some network protocols. With an IP-only
1706           configuration it is safe to say N, otherwise say Y.
1707
1708 config UACCESS_WITH_MEMCPY
1709         bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1710         depends on MMU
1711         default y if CPU_FEROCEON
1712         help
1713           Implement faster copy_to_user and clear_user methods for CPU
1714           cores where a 8-word STM instruction give significantly higher
1715           memory write throughput than a sequence of individual 32bit stores.
1716
1717           A possible side effect is a slight increase in scheduling latency
1718           between threads sharing the same address space if they invoke
1719           such copy operations with large buffers.
1720
1721           However, if the CPU data cache is using a write-allocate mode,
1722           this option is unlikely to provide any performance gain.
1723
1724 config SECCOMP
1725         bool
1726         prompt "Enable seccomp to safely compute untrusted bytecode"
1727         ---help---
1728           This kernel feature is useful for number crunching applications
1729           that may need to compute untrusted bytecode during their
1730           execution. By using pipes or other transports made available to
1731           the process as file descriptors supporting the read/write
1732           syscalls, it's possible to isolate those applications in
1733           their own address space using seccomp. Once seccomp is
1734           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1735           and the task is only allowed to execute a few safe syscalls
1736           defined by each seccomp mode.
1737
1738 config SWIOTLB
1739         def_bool y
1740
1741 config IOMMU_HELPER
1742         def_bool SWIOTLB
1743
1744 config PARAVIRT
1745         bool "Enable paravirtualization code"
1746         help
1747           This changes the kernel so it can modify itself when it is run
1748           under a hypervisor, potentially improving performance significantly
1749           over full virtualization.
1750
1751 config PARAVIRT_TIME_ACCOUNTING
1752         bool "Paravirtual steal time accounting"
1753         select PARAVIRT
1754         default n
1755         help
1756           Select this option to enable fine granularity task steal time
1757           accounting. Time spent executing other tasks in parallel with
1758           the current vCPU is discounted from the vCPU power. To account for
1759           that, there can be a small performance impact.
1760
1761           If in doubt, say N here.
1762
1763 config XEN_DOM0
1764         def_bool y
1765         depends on XEN
1766
1767 config XEN
1768         bool "Xen guest support on ARM"
1769         depends on ARM && AEABI && OF
1770         depends on CPU_V7 && !CPU_V6
1771         depends on !GENERIC_ATOMIC64
1772         depends on MMU
1773         select ARCH_DMA_ADDR_T_64BIT
1774         select ARM_PSCI
1775         select SWIOTLB_XEN
1776         select PARAVIRT
1777         help
1778           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1779
1780 endmenu
1781
1782 menu "Boot options"
1783
1784 config USE_OF
1785         bool "Flattened Device Tree support"
1786         select IRQ_DOMAIN
1787         select OF
1788         help
1789           Include support for flattened device tree machine descriptions.
1790
1791 config ATAGS
1792         bool "Support for the traditional ATAGS boot data passing" if USE_OF
1793         default y
1794         help
1795           This is the traditional way of passing data to the kernel at boot
1796           time. If you are solely relying on the flattened device tree (or
1797           the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1798           to remove ATAGS support from your kernel binary.  If unsure,
1799           leave this to y.
1800
1801 config DEPRECATED_PARAM_STRUCT
1802         bool "Provide old way to pass kernel parameters"
1803         depends on ATAGS
1804         help
1805           This was deprecated in 2001 and announced to live on for 5 years.
1806           Some old boot loaders still use this way.
1807
1808 # Compressed boot loader in ROM.  Yes, we really want to ask about
1809 # TEXT and BSS so we preserve their values in the config files.
1810 config ZBOOT_ROM_TEXT
1811         hex "Compressed ROM boot loader base address"
1812         default "0"
1813         help
1814           The physical address at which the ROM-able zImage is to be
1815           placed in the target.  Platforms which normally make use of
1816           ROM-able zImage formats normally set this to a suitable
1817           value in their defconfig file.
1818
1819           If ZBOOT_ROM is not enabled, this has no effect.
1820
1821 config ZBOOT_ROM_BSS
1822         hex "Compressed ROM boot loader BSS address"
1823         default "0"
1824         help
1825           The base address of an area of read/write memory in the target
1826           for the ROM-able zImage which must be available while the
1827           decompressor is running. It must be large enough to hold the
1828           entire decompressed kernel plus an additional 128 KiB.
1829           Platforms which normally make use of ROM-able zImage formats
1830           normally set this to a suitable value in their defconfig file.
1831
1832           If ZBOOT_ROM is not enabled, this has no effect.
1833
1834 config ZBOOT_ROM
1835         bool "Compressed boot loader in ROM/flash"
1836         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1837         depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1838         help
1839           Say Y here if you intend to execute your compressed kernel image
1840           (zImage) directly from ROM or flash.  If unsure, say N.
1841
1842 config ARM_APPENDED_DTB
1843         bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1844         depends on OF
1845         help
1846           With this option, the boot code will look for a device tree binary
1847           (DTB) appended to zImage
1848           (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1849
1850           This is meant as a backward compatibility convenience for those
1851           systems with a bootloader that can't be upgraded to accommodate
1852           the documented boot protocol using a device tree.
1853
1854           Beware that there is very little in terms of protection against
1855           this option being confused by leftover garbage in memory that might
1856           look like a DTB header after a reboot if no actual DTB is appended
1857           to zImage.  Do not leave this option active in a production kernel
1858           if you don't intend to always append a DTB.  Proper passing of the
1859           location into r2 of a bootloader provided DTB is always preferable
1860           to this option.
1861
1862 config ARM_ATAG_DTB_COMPAT
1863         bool "Supplement the appended DTB with traditional ATAG information"
1864         depends on ARM_APPENDED_DTB
1865         help
1866           Some old bootloaders can't be updated to a DTB capable one, yet
1867           they provide ATAGs with memory configuration, the ramdisk address,
1868           the kernel cmdline string, etc.  Such information is dynamically
1869           provided by the bootloader and can't always be stored in a static
1870           DTB.  To allow a device tree enabled kernel to be used with such
1871           bootloaders, this option allows zImage to extract the information
1872           from the ATAG list and store it at run time into the appended DTB.
1873
1874 choice
1875         prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1876         default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1877
1878 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1879         bool "Use bootloader kernel arguments if available"
1880         help
1881           Uses the command-line options passed by the boot loader instead of
1882           the device tree bootargs property. If the boot loader doesn't provide
1883           any, the device tree bootargs property will be used.
1884
1885 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1886         bool "Extend with bootloader kernel arguments"
1887         help
1888           The command-line arguments provided by the boot loader will be
1889           appended to the the device tree bootargs property.
1890
1891 endchoice
1892
1893 config CMDLINE
1894         string "Default kernel command string"
1895         default ""
1896         help
1897           On some architectures (EBSA110 and CATS), there is currently no way
1898           for the boot loader to pass arguments to the kernel. For these
1899           architectures, you should supply some command-line options at build
1900           time by entering them here. As a minimum, you should specify the
1901           memory size and the root device (e.g., mem=64M root=/dev/nfs).
1902
1903 choice
1904         prompt "Kernel command line type" if CMDLINE != ""
1905         default CMDLINE_FROM_BOOTLOADER
1906         depends on ATAGS
1907
1908 config CMDLINE_FROM_BOOTLOADER
1909         bool "Use bootloader kernel arguments if available"
1910         help
1911           Uses the command-line options passed by the boot loader. If
1912           the boot loader doesn't provide any, the default kernel command
1913           string provided in CMDLINE will be used.
1914
1915 config CMDLINE_EXTEND
1916         bool "Extend bootloader kernel arguments"
1917         help
1918           The command-line arguments provided by the boot loader will be
1919           appended to the default kernel command string.
1920
1921 config CMDLINE_FORCE
1922         bool "Always use the default kernel command string"
1923         help
1924           Always use the default kernel command string, even if the boot
1925           loader passes other arguments to the kernel.
1926           This is useful if you cannot or don't want to change the
1927           command-line options your boot loader passes to the kernel.
1928 endchoice
1929
1930 config XIP_KERNEL
1931         bool "Kernel Execute-In-Place from ROM"
1932         depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1933         help
1934           Execute-In-Place allows the kernel to run from non-volatile storage
1935           directly addressable by the CPU, such as NOR flash. This saves RAM
1936           space since the text section of the kernel is not loaded from flash
1937           to RAM.  Read-write sections, such as the data section and stack,
1938           are still copied to RAM.  The XIP kernel is not compressed since
1939           it has to run directly from flash, so it will take more space to
1940           store it.  The flash address used to link the kernel object files,
1941           and for storing it, is configuration dependent. Therefore, if you
1942           say Y here, you must know the proper physical address where to
1943           store the kernel image depending on your own flash memory usage.
1944
1945           Also note that the make target becomes "make xipImage" rather than
1946           "make zImage" or "make Image".  The final kernel binary to put in
1947           ROM memory will be arch/arm/boot/xipImage.
1948
1949           If unsure, say N.
1950
1951 config XIP_PHYS_ADDR
1952         hex "XIP Kernel Physical Location"
1953         depends on XIP_KERNEL
1954         default "0x00080000"
1955         help
1956           This is the physical address in your flash memory the kernel will
1957           be linked for and stored to.  This address is dependent on your
1958           own flash usage.
1959
1960 config KEXEC
1961         bool "Kexec system call (EXPERIMENTAL)"
1962         depends on (!SMP || PM_SLEEP_SMP)
1963         depends on !CPU_V7M
1964         select KEXEC_CORE
1965         help
1966           kexec is a system call that implements the ability to shutdown your
1967           current kernel, and to start another kernel.  It is like a reboot
1968           but it is independent of the system firmware.   And like a reboot
1969           you can start any kernel with it, not just Linux.
1970
1971           It is an ongoing process to be certain the hardware in a machine
1972           is properly shutdown, so do not be surprised if this code does not
1973           initially work for you.
1974
1975 config ATAGS_PROC
1976         bool "Export atags in procfs"
1977         depends on ATAGS && KEXEC
1978         default y
1979         help
1980           Should the atags used to boot the kernel be exported in an "atags"
1981           file in procfs. Useful with kexec.
1982
1983 config CRASH_DUMP
1984         bool "Build kdump crash kernel (EXPERIMENTAL)"
1985         help
1986           Generate crash dump after being started by kexec. This should
1987           be normally only set in special crash dump kernels which are
1988           loaded in the main kernel with kexec-tools into a specially
1989           reserved region and then later executed after a crash by
1990           kdump/kexec. The crash dump kernel must be compiled to a
1991           memory address not used by the main kernel
1992
1993           For more details see Documentation/kdump/kdump.txt
1994
1995 config AUTO_ZRELADDR
1996         bool "Auto calculation of the decompressed kernel image address"
1997         help
1998           ZRELADDR is the physical address where the decompressed kernel
1999           image will be placed. If AUTO_ZRELADDR is selected, the address
2000           will be determined at run-time by masking the current IP with
2001           0xf8000000. This assumes the zImage being placed in the first 128MB
2002           from start of memory.
2003
2004 config EFI_STUB
2005         bool
2006
2007 config EFI
2008         bool "UEFI runtime support"
2009         depends on OF && !CPU_BIG_ENDIAN && MMU && AUTO_ZRELADDR && !XIP_KERNEL
2010         select UCS2_STRING
2011         select EFI_PARAMS_FROM_FDT
2012         select EFI_STUB
2013         select EFI_ARMSTUB
2014         select EFI_RUNTIME_WRAPPERS
2015         ---help---
2016           This option provides support for runtime services provided
2017           by UEFI firmware (such as non-volatile variables, realtime
2018           clock, and platform reset). A UEFI stub is also provided to
2019           allow the kernel to be booted as an EFI application. This
2020           is only useful for kernels that may run on systems that have
2021           UEFI firmware.
2022
2023 endmenu
2024
2025 menu "CPU Power Management"
2026
2027 source "drivers/cpufreq/Kconfig"
2028
2029 source "drivers/cpuidle/Kconfig"
2030
2031 endmenu
2032
2033 menu "Floating point emulation"
2034
2035 comment "At least one emulation must be selected"
2036
2037 config FPE_NWFPE
2038         bool "NWFPE math emulation"
2039         depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2040         ---help---
2041           Say Y to include the NWFPE floating point emulator in the kernel.
2042           This is necessary to run most binaries. Linux does not currently
2043           support floating point hardware so you need to say Y here even if
2044           your machine has an FPA or floating point co-processor podule.
2045
2046           You may say N here if you are going to load the Acorn FPEmulator
2047           early in the bootup.
2048
2049 config FPE_NWFPE_XP
2050         bool "Support extended precision"
2051         depends on FPE_NWFPE
2052         help
2053           Say Y to include 80-bit support in the kernel floating-point
2054           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
2055           Note that gcc does not generate 80-bit operations by default,
2056           so in most cases this option only enlarges the size of the
2057           floating point emulator without any good reason.
2058
2059           You almost surely want to say N here.
2060
2061 config FPE_FASTFPE
2062         bool "FastFPE math emulation (EXPERIMENTAL)"
2063         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2064         ---help---
2065           Say Y here to include the FAST floating point emulator in the kernel.
2066           This is an experimental much faster emulator which now also has full
2067           precision for the mantissa.  It does not support any exceptions.
2068           It is very simple, and approximately 3-6 times faster than NWFPE.
2069
2070           It should be sufficient for most programs.  It may be not suitable
2071           for scientific calculations, but you have to check this for yourself.
2072           If you do not feel you need a faster FP emulation you should better
2073           choose NWFPE.
2074
2075 config VFP
2076         bool "VFP-format floating point maths"
2077         depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2078         help
2079           Say Y to include VFP support code in the kernel. This is needed
2080           if your hardware includes a VFP unit.
2081
2082           Please see <file:Documentation/arm/VFP/release-notes.txt> for
2083           release notes and additional status information.
2084
2085           Say N if your target does not have VFP hardware.
2086
2087 config VFPv3
2088         bool
2089         depends on VFP
2090         default y if CPU_V7
2091
2092 config NEON
2093         bool "Advanced SIMD (NEON) Extension support"
2094         depends on VFPv3 && CPU_V7
2095         help
2096           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2097           Extension.
2098
2099 config KERNEL_MODE_NEON
2100         bool "Support for NEON in kernel mode"
2101         depends on NEON && AEABI
2102         help
2103           Say Y to include support for NEON in kernel mode.
2104
2105 endmenu
2106
2107 menu "Userspace binary formats"
2108
2109 source "fs/Kconfig.binfmt"
2110
2111 endmenu
2112
2113 menu "Power management options"
2114
2115 source "kernel/power/Kconfig"
2116
2117 config ARCH_SUSPEND_POSSIBLE
2118         depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2119                 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2120         def_bool y
2121
2122 config ARM_CPU_SUSPEND
2123         def_bool PM_SLEEP || BL_SWITCHER || ARM_PSCI_FW
2124         depends on ARCH_SUSPEND_POSSIBLE
2125
2126 config ARCH_HIBERNATION_POSSIBLE
2127         bool
2128         depends on MMU
2129         default y if ARCH_SUSPEND_POSSIBLE
2130
2131 endmenu
2132
2133 source "net/Kconfig"
2134
2135 source "drivers/Kconfig"
2136
2137 source "drivers/firmware/Kconfig"
2138
2139 source "fs/Kconfig"
2140
2141 source "arch/arm/Kconfig.debug"
2142
2143 source "security/Kconfig"
2144
2145 source "crypto/Kconfig"
2146 if CRYPTO
2147 source "arch/arm/crypto/Kconfig"
2148 endif
2149
2150 source "lib/Kconfig"
2151
2152 source "arch/arm/kvm/Kconfig"