arch/arm/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 config ARM
   3         bool
   4         default y
   5         select ARCH_CLOCKSOURCE_DATA
   6         select ARCH_HAS_DEBUG_VIRTUAL
   7         select ARCH_HAS_DEVMEM_IS_ALLOWED
   8         select ARCH_HAS_ELF_RANDOMIZE
   9         select ARCH_HAS_SET_MEMORY
  10         select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
  11         select ARCH_HAS_STRICT_MODULE_RWX if MMU
  12         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  13         select ARCH_HAVE_CUSTOM_GPIO_H
  14         select ARCH_HAS_GCOV_PROFILE_ALL
  15         select ARCH_MIGHT_HAVE_PC_PARPORT
  16         select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
  17         select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if CPU_V7
  18         select ARCH_SUPPORTS_ATOMIC_RMW
  19         select ARCH_USE_BUILTIN_BSWAP
  20         select ARCH_USE_CMPXCHG_LOCKREF
  21         select ARCH_WANT_IPC_PARSE_VERSION
  22         select BUILDTIME_EXTABLE_SORT if MMU
  23         select CLONE_BACKWARDS
  24         select CPU_PM if (SUSPEND || CPU_IDLE)
  25         select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
  26         select DMA_NOOP_OPS if !MMU
  27         select EDAC_SUPPORT
  28         select EDAC_ATOMIC_SCRUB
  29         select GENERIC_ALLOCATOR
  30         select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY
  31         select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
  32         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  33         select GENERIC_CPU_AUTOPROBE
  34         select GENERIC_EARLY_IOREMAP
  35         select GENERIC_IDLE_POLL_SETUP
  36         select GENERIC_IRQ_PROBE
  37         select GENERIC_IRQ_SHOW
  38         select GENERIC_IRQ_SHOW_LEVEL
  39         select GENERIC_PCI_IOMAP
  40         select GENERIC_SCHED_CLOCK
  41         select GENERIC_SMP_IDLE_THREAD
  42         select GENERIC_STRNCPY_FROM_USER
  43         select GENERIC_STRNLEN_USER
  44         select HANDLE_DOMAIN_IRQ
  45         select HARDIRQS_SW_RESEND
  46         select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
  47         select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
  48         select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
  49         select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
  50         select HAVE_ARCH_MMAP_RND_BITS if MMU
  51         select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
  52         select HAVE_ARCH_TRACEHOOK
  53         select HAVE_ARM_SMCCC if CPU_V7
  54         select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32
  55         select HAVE_CC_STACKPROTECTOR
  56         select HAVE_CONTEXT_TRACKING
  57         select HAVE_C_RECORDMCOUNT
  58         select HAVE_DEBUG_KMEMLEAK
  59         select HAVE_DMA_API_DEBUG
  60         select HAVE_DMA_CONTIGUOUS if MMU
  61         select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32 && MMU
  62         select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
  63         select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
  64         select HAVE_EXIT_THREAD
  65         select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  66         select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  67         select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  68         select HAVE_GCC_PLUGINS
  69         select HAVE_GENERIC_DMA_COHERENT
  70         select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  71         select HAVE_IDE if PCI || ISA || PCMCIA
  72         select HAVE_IRQ_TIME_ACCOUNTING
  73         select HAVE_KERNEL_GZIP
  74         select HAVE_KERNEL_LZ4
  75         select HAVE_KERNEL_LZMA
  76         select HAVE_KERNEL_LZO
  77         select HAVE_KERNEL_XZ
  78         select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
  79         select HAVE_KRETPROBES if (HAVE_KPROBES)
  80         select HAVE_MEMBLOCK
  81         select HAVE_MOD_ARCH_SPECIFIC
  82         select HAVE_NMI
  83         select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  84         select HAVE_OPTPROBES if !THUMB2_KERNEL
  85         select HAVE_PERF_EVENTS
  86         select HAVE_PERF_REGS
  87         select HAVE_PERF_USER_STACK_DUMP
  88         select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
  89         select HAVE_REGS_AND_STACK_ACCESS_API
  90         select HAVE_SYSCALL_TRACEPOINTS
  91         select HAVE_UID16
  92         select HAVE_VIRT_CPU_ACCOUNTING_GEN
  93         select IRQ_FORCED_THREADING
  94         select MODULES_USE_ELF_REL
  95         select NO_BOOTMEM
  96         select OF_EARLY_FLATTREE if OF
  97         select OF_RESERVED_MEM if OF
  98         select OLD_SIGACTION
  99         select OLD_SIGSUSPEND3
 100         select PERF_USE_VMALLOC
 101         select RTC_LIB
 102         select SYS_SUPPORTS_APM_EMULATION
 103         # Above selects are sorted alphabetically; please add new ones
 104         # according to that.  Thanks.
 105         help
 106           The ARM series is a line of low-power-consumption RISC chip designs
 107           licensed by ARM Ltd and targeted at embedded applications and
 108           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
 109           manufactured, but legacy ARM-based PC hardware remains popular in
 110           Europe.  There is an ARM Linux project with a web page at
 111           <http://www.arm.linux.org.uk/>.
 112
 113 config ARM_HAS_SG_CHAIN
 114         select ARCH_HAS_SG_CHAIN
 115         bool
 116
 117 config NEED_SG_DMA_LENGTH
 118         bool
 119
 120 config ARM_DMA_USE_IOMMU
 121         bool
 122         select ARM_HAS_SG_CHAIN
 123         select NEED_SG_DMA_LENGTH
 124
 125 if ARM_DMA_USE_IOMMU
 126
 127 config ARM_DMA_IOMMU_ALIGNMENT
 128         int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
 129         range 4 9
 130         default 8
 131         help
 132           DMA mapping framework by default aligns all buffers to the smallest
 133           PAGE_SIZE order which is greater than or equal to the requested buffer
 134           size. This works well for buffers up to a few hundreds kilobytes, but
 135           for larger buffers it just a waste of address space. Drivers which has
 136           relatively small addressing window (like 64Mib) might run out of
 137           virtual space with just a few allocations.
 138
 139           With this parameter you can specify the maximum PAGE_SIZE order for
 140           DMA IOMMU buffers. Larger buffers will be aligned only to this
 141           specified order. The order is expressed as a power of two multiplied
 142           by the PAGE_SIZE.
 143
 144 endif
 145
 146 config MIGHT_HAVE_PCI
 147         bool
 148
 149 config SYS_SUPPORTS_APM_EMULATION
 150         bool
 151
 152 config HAVE_TCM
 153         bool
 154         select GENERIC_ALLOCATOR
 155
 156 config HAVE_PROC_CPU
 157         bool
 158
 159 config NO_IOPORT_MAP
 160         bool
 161
 162 config EISA
 163         bool
 164         ---help---
 165           The Extended Industry Standard Architecture (EISA) bus was
 166           developed as an open alternative to the IBM MicroChannel bus.
 167
 168           The EISA bus provided some of the features of the IBM MicroChannel
 169           bus while maintaining backward compatibility with cards made for
 170           the older ISA bus.  The EISA bus saw limited use between 1988 and
 171           1995 when it was made obsolete by the PCI bus.
 172
 173           Say Y here if you are building a kernel for an EISA-based machine.
 174
 175           Otherwise, say N.
 176
 177 config SBUS
 178         bool
 179
 180 config STACKTRACE_SUPPORT
 181         bool
 182         default y
 183
 184 config LOCKDEP_SUPPORT
 185         bool
 186         default y
 187
 188 config TRACE_IRQFLAGS_SUPPORT
 189         bool
 190         default !CPU_V7M
 191
 192 config RWSEM_XCHGADD_ALGORITHM
 193         bool
 194         default y
 195
 196 config ARCH_HAS_ILOG2_U32
 197         bool
 198
 199 config ARCH_HAS_ILOG2_U64
 200         bool
 201
 202 config ARCH_HAS_BANDGAP
 203         bool
 204
 205 config FIX_EARLYCON_MEM
 206         def_bool y if MMU
 207
 208 config GENERIC_HWEIGHT
 209         bool
 210         default y
 211
 212 config GENERIC_CALIBRATE_DELAY
 213         bool
 214         default y
 215
 216 config ARCH_MAY_HAVE_PC_FDC
 217         bool
 218
 219 config ZONE_DMA
 220         bool
 221
 222 config NEED_DMA_MAP_STATE
 223        def_bool y
 224
 225 config ARCH_SUPPORTS_UPROBES
 226         def_bool y
 227
 228 config ARCH_HAS_DMA_SET_COHERENT_MASK
 229         bool
 230
 231 config GENERIC_ISA_DMA
 232         bool
 233
 234 config FIQ
 235         bool
 236
 237 config NEED_RET_TO_USER
 238         bool
 239
 240 config ARCH_MTD_XIP
 241         bool
 242
 243 config VECTORS_BASE
 244         hex
 245         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 246         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 247         default 0x00000000
 248         help
 249           The base address of exception vectors.  This must be two pages
 250           in size.
 251
 252 config ARM_PATCH_PHYS_VIRT
 253         bool "Patch physical to virtual translations at runtime" if EMBEDDED
 254         default y
 255         depends on !XIP_KERNEL && MMU
 256         help
 257           Patch phys-to-virt and virt-to-phys translation functions at
 258           boot and module load time according to the position of the
 259           kernel in system memory.
 260
 261           This can only be used with non-XIP MMU kernels where the base
 262           of physical memory is at a 16MB boundary.
 263
 264           Only disable this option if you know that you do not require
 265           this feature (eg, building a kernel for a single machine) and
 266           you need to shrink the kernel to the minimal size.
 267
 268 config NEED_MACH_IO_H
 269         bool
 270         help
 271           Select this when mach/io.h is required to provide special
 272           definitions for this platform.  The need for mach/io.h should
 273           be avoided when possible.
 274
 275 config NEED_MACH_MEMORY_H
 276         bool
 277         help
 278           Select this when mach/memory.h is required to provide special
 279           definitions for this platform.  The need for mach/memory.h should
 280           be avoided when possible.
 281
 282 config PHYS_OFFSET
 283         hex "Physical address of main memory" if MMU
 284         depends on !ARM_PATCH_PHYS_VIRT
 285         default DRAM_BASE if !MMU
 286         default 0x00000000 if ARCH_EBSA110 || \
 287                         ARCH_FOOTBRIDGE || \
 288                         ARCH_INTEGRATOR || \
 289                         ARCH_IOP13XX || \
 290                         ARCH_KS8695 || \
 291                         ARCH_REALVIEW
 292         default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
 293         default 0x20000000 if ARCH_S5PV210
 294         default 0xc0000000 if ARCH_SA1100
 295         help
 296           Please provide the physical address corresponding to the
 297           location of main memory in your system.
 298
 299 config GENERIC_BUG
 300         def_bool y
 301         depends on BUG
 302
 303 config PGTABLE_LEVELS
 304         int
 305         default 3 if ARM_LPAE
 306         default 2
 307
 308 source "init/Kconfig"
 309
 310 source "kernel/Kconfig.freezer"
 311
 312 menu "System Type"
 313
 314 config MMU
 315         bool "MMU-based Paged Memory Management Support"
 316         default y
 317         help
 318           Select if you want MMU-based virtualised addressing space
 319           support by paged memory management. If unsure, say 'Y'.
 320
 321 config ARCH_MMAP_RND_BITS_MIN
 322         default 8
 323
 324 config ARCH_MMAP_RND_BITS_MAX
 325         default 14 if PAGE_OFFSET=0x40000000
 326         default 15 if PAGE_OFFSET=0x80000000
 327         default 16
 328
 329 #
 330 # The "ARM system type" choice list is ordered alphabetically by option
 331 # text.  Please add new entries in the option alphabetic order.
 332 #
 333 choice
 334         prompt "ARM system type"
 335         default ARM_SINGLE_ARMV7M if !MMU
 336         default ARCH_MULTIPLATFORM if MMU
 337
 338 config ARCH_MULTIPLATFORM
 339         bool "Allow multiple platforms to be selected"
 340         depends on MMU
 341         select ARM_HAS_SG_CHAIN
 342         select ARM_PATCH_PHYS_VIRT
 343         select AUTO_ZRELADDR
 344         select TIMER_OF
 345         select COMMON_CLK
 346         select GENERIC_CLOCKEVENTS
 347         select MIGHT_HAVE_PCI
 348         select MULTI_IRQ_HANDLER
 349         select PCI_DOMAINS if PCI
 350         select SPARSE_IRQ
 351         select USE_OF
 352
 353 config ARM_SINGLE_ARMV7M
 354         bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
 355         depends on !MMU
 356         select ARM_NVIC
 357         select AUTO_ZRELADDR
 358         select TIMER_OF
 359         select COMMON_CLK
 360         select CPU_V7M
 361         select GENERIC_CLOCKEVENTS
 362         select NO_IOPORT_MAP
 363         select SPARSE_IRQ
 364         select USE_OF
 365
 366 config ARCH_EBSA110
 367         bool "EBSA-110"
 368         select ARCH_USES_GETTIMEOFFSET
 369         select CPU_SA110
 370         select ISA
 371         select NEED_MACH_IO_H
 372         select NEED_MACH_MEMORY_H
 373         select NO_IOPORT_MAP
 374         help
 375           This is an evaluation board for the StrongARM processor available
 376           from Digital. It has limited hardware on-board, including an
 377           Ethernet interface, two PCMCIA sockets, two serial ports and a
 378           parallel port.
 379
 380 config ARCH_EP93XX
 381         bool "EP93xx-based"
 382         select ARCH_HAS_HOLES_MEMORYMODEL
 383         select ARM_AMBA
 384         imply ARM_PATCH_PHYS_VIRT
 385         select ARM_VIC
 386         select AUTO_ZRELADDR
 387         select CLKDEV_LOOKUP
 388         select CLKSRC_MMIO
 389         select CPU_ARM920T
 390         select GENERIC_CLOCKEVENTS
 391         select GPIOLIB
 392         help
 393           This enables support for the Cirrus EP93xx series of CPUs.
 394
 395 config ARCH_FOOTBRIDGE
 396         bool "FootBridge"
 397         select CPU_SA110
 398         select FOOTBRIDGE
 399         select GENERIC_CLOCKEVENTS
 400         select HAVE_IDE
 401         select NEED_MACH_IO_H if !MMU
 402         select NEED_MACH_MEMORY_H
 403         help
 404           Support for systems based on the DC21285 companion chip
 405           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 406
 407 config ARCH_NETX
 408         bool "Hilscher NetX based"
 409         select ARM_VIC
 410         select CLKSRC_MMIO
 411         select CPU_ARM926T
 412         select GENERIC_CLOCKEVENTS
 413         help
 414           This enables support for systems based on the Hilscher NetX Soc
 415
 416 config ARCH_IOP13XX
 417         bool "IOP13xx-based"
 418         depends on MMU
 419         select CPU_XSC3
 420         select NEED_MACH_MEMORY_H
 421         select NEED_RET_TO_USER
 422         select PCI
 423         select PLAT_IOP
 424         select VMSPLIT_1G
 425         select SPARSE_IRQ
 426         help
 427           Support for Intel's IOP13XX (XScale) family of processors.
 428
 429 config ARCH_IOP32X
 430         bool "IOP32x-based"
 431         depends on MMU
 432         select CPU_XSCALE
 433         select GPIO_IOP
 434         select GPIOLIB
 435         select NEED_RET_TO_USER
 436         select PCI
 437         select PLAT_IOP
 438         help
 439           Support for Intel's 80219 and IOP32X (XScale) family of
 440           processors.
 441
 442 config ARCH_IOP33X
 443         bool "IOP33x-based"
 444         depends on MMU
 445         select CPU_XSCALE
 446         select GPIO_IOP
 447         select GPIOLIB
 448         select NEED_RET_TO_USER
 449         select PCI
 450         select PLAT_IOP
 451         help
 452           Support for Intel's IOP33X (XScale) family of processors.
 453
 454 config ARCH_IXP4XX
 455         bool "IXP4xx-based"
 456         depends on MMU
 457         select ARCH_HAS_DMA_SET_COHERENT_MASK
 458         select ARCH_SUPPORTS_BIG_ENDIAN
 459         select CLKSRC_MMIO
 460         select CPU_XSCALE
 461         select DMABOUNCE if PCI
 462         select GENERIC_CLOCKEVENTS
 463         select GPIOLIB
 464         select MIGHT_HAVE_PCI
 465         select NEED_MACH_IO_H
 466         select USB_EHCI_BIG_ENDIAN_DESC
 467         select USB_EHCI_BIG_ENDIAN_MMIO
 468         help
 469           Support for Intel's IXP4XX (XScale) family of processors.
 470
 471 config ARCH_DOVE
 472         bool "Marvell Dove"
 473         select CPU_PJ4
 474         select GENERIC_CLOCKEVENTS
 475         select GPIOLIB
 476         select MIGHT_HAVE_PCI
 477         select MULTI_IRQ_HANDLER
 478         select MVEBU_MBUS
 479         select PINCTRL
 480         select PINCTRL_DOVE
 481         select PLAT_ORION_LEGACY
 482         select SPARSE_IRQ
 483         select PM_GENERIC_DOMAINS if PM
 484         help
 485           Support for the Marvell Dove SoC 88AP510
 486
 487 config ARCH_KS8695
 488         bool "Micrel/Kendin KS8695"
 489         select CLKSRC_MMIO
 490         select CPU_ARM922T
 491         select GENERIC_CLOCKEVENTS
 492         select GPIOLIB
 493         select NEED_MACH_MEMORY_H
 494         help
 495           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 496           System-on-Chip devices.
 497
 498 config ARCH_W90X900
 499         bool "Nuvoton W90X900 CPU"
 500         select CLKDEV_LOOKUP
 501         select CLKSRC_MMIO
 502         select CPU_ARM926T
 503         select GENERIC_CLOCKEVENTS
 504         select GPIOLIB
 505         help
 506           Support for Nuvoton (Winbond logic dept.) ARM9 processor,
 507           At present, the w90x900 has been renamed nuc900, regarding
 508           the ARM series product line, you can login the following
 509           link address to know more.
 510
 511           <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
 512                 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
 513
 514 config ARCH_LPC32XX
 515         bool "NXP LPC32XX"
 516         select ARM_AMBA
 517         select CLKDEV_LOOKUP
 518         select CLKSRC_LPC32XX
 519         select COMMON_CLK
 520         select CPU_ARM926T
 521         select GENERIC_CLOCKEVENTS
 522         select GPIOLIB
 523         select MULTI_IRQ_HANDLER
 524         select SPARSE_IRQ
 525         select USE_OF
 526         help
 527           Support for the NXP LPC32XX family of processors
 528
 529 config ARCH_PXA
 530         bool "PXA2xx/PXA3xx-based"
 531         depends on MMU
 532         select ARCH_MTD_XIP
 533         select ARM_CPU_SUSPEND if PM
 534         select AUTO_ZRELADDR
 535         select COMMON_CLK
 536         select CLKDEV_LOOKUP
 537         select CLKSRC_PXA
 538         select CLKSRC_MMIO
 539         select TIMER_OF
 540         select CPU_XSCALE if !CPU_XSC3
 541         select GENERIC_CLOCKEVENTS
 542         select GPIO_PXA
 543         select GPIOLIB
 544         select HAVE_IDE
 545         select IRQ_DOMAIN
 546         select MULTI_IRQ_HANDLER
 547         select PLAT_PXA
 548         select SPARSE_IRQ
 549         help
 550           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 551
 552 config ARCH_RPC
 553         bool "RiscPC"
 554         depends on MMU
 555         select ARCH_ACORN
 556         select ARCH_MAY_HAVE_PC_FDC
 557         select ARCH_SPARSEMEM_ENABLE
 558         select ARCH_USES_GETTIMEOFFSET
 559         select CPU_SA110
 560         select FIQ
 561         select HAVE_IDE
 562         select HAVE_PATA_PLATFORM
 563         select ISA_DMA_API
 564         select NEED_MACH_IO_H
 565         select NEED_MACH_MEMORY_H
 566         select NO_IOPORT_MAP
 567         help
 568           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 569           CD-ROM interface, serial and parallel port, and the floppy drive.
 570
 571 config ARCH_SA1100
 572         bool "SA1100-based"
 573         select ARCH_MTD_XIP
 574         select ARCH_SPARSEMEM_ENABLE
 575         select CLKDEV_LOOKUP
 576         select CLKSRC_MMIO
 577         select CLKSRC_PXA
 578         select TIMER_OF if OF
 579         select CPU_FREQ
 580         select CPU_SA1100
 581         select GENERIC_CLOCKEVENTS
 582         select GPIOLIB
 583         select HAVE_IDE
 584         select IRQ_DOMAIN
 585         select ISA
 586         select MULTI_IRQ_HANDLER
 587         select NEED_MACH_MEMORY_H
 588         select SPARSE_IRQ
 589         help
 590           Support for StrongARM 11x0 based boards.
 591
 592 config ARCH_S3C24XX
 593         bool "Samsung S3C24XX SoCs"
 594         select ATAGS
 595         select CLKDEV_LOOKUP
 596         select CLKSRC_SAMSUNG_PWM
 597         select GENERIC_CLOCKEVENTS
 598         select GPIO_SAMSUNG
 599         select GPIOLIB
 600         select HAVE_S3C2410_I2C if I2C
 601         select HAVE_S3C2410_WATCHDOG if WATCHDOG
 602         select HAVE_S3C_RTC if RTC_CLASS
 603         select MULTI_IRQ_HANDLER
 604         select NEED_MACH_IO_H
 605         select SAMSUNG_ATAGS
 606         help
 607           Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
 608           and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
 609           (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
 610           Samsung SMDK2410 development board (and derivatives).
 611
 612 config ARCH_DAVINCI
 613         bool "TI DaVinci"
 614         select ARCH_HAS_HOLES_MEMORYMODEL
 615         select CLKDEV_LOOKUP
 616         select CPU_ARM926T
 617         select GENERIC_ALLOCATOR
 618         select GENERIC_CLOCKEVENTS
 619         select GENERIC_IRQ_CHIP
 620         select GPIOLIB
 621         select HAVE_IDE
 622         select USE_OF
 623         select ZONE_DMA
 624         help
 625           Support for TI's DaVinci platform.
 626
 627 config ARCH_OMAP1
 628         bool "TI OMAP1"
 629         depends on MMU
 630         select ARCH_HAS_HOLES_MEMORYMODEL
 631         select ARCH_OMAP
 632         select CLKDEV_LOOKUP
 633         select CLKSRC_MMIO
 634         select GENERIC_CLOCKEVENTS
 635         select GENERIC_IRQ_CHIP
 636         select GPIOLIB
 637         select HAVE_IDE
 638         select IRQ_DOMAIN
 639         select MULTI_IRQ_HANDLER
 640         select NEED_MACH_IO_H if PCCARD
 641         select NEED_MACH_MEMORY_H
 642         select SPARSE_IRQ
 643         help
 644           Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
 645
 646 endchoice
 647
 648 menu "Multiple platform selection"
 649         depends on ARCH_MULTIPLATFORM
 650
 651 comment "CPU Core family selection"
 652
 653 config ARCH_MULTI_V4
 654         bool "ARMv4 based platforms (FA526)"
 655         depends on !ARCH_MULTI_V6_V7
 656         select ARCH_MULTI_V4_V5
 657         select CPU_FA526
 658
 659 config ARCH_MULTI_V4T
 660         bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
 661         depends on !ARCH_MULTI_V6_V7
 662         select ARCH_MULTI_V4_V5
 663         select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
 664                 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
 665                 CPU_ARM925T || CPU_ARM940T)
 666
 667 config ARCH_MULTI_V5
 668         bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
 669         depends on !ARCH_MULTI_V6_V7
 670         select ARCH_MULTI_V4_V5
 671         select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
 672                 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
 673                 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
 674
 675 config ARCH_MULTI_V4_V5
 676         bool
 677
 678 config ARCH_MULTI_V6
 679         bool "ARMv6 based platforms (ARM11)"
 680         select ARCH_MULTI_V6_V7
 681         select CPU_V6K
 682
 683 config ARCH_MULTI_V7
 684         bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
 685         default y
 686         select ARCH_MULTI_V6_V7
 687         select CPU_V7
 688         select HAVE_SMP
 689
 690 config ARCH_MULTI_V6_V7
 691         bool
 692         select MIGHT_HAVE_CACHE_L2X0
 693
 694 config ARCH_MULTI_CPU_AUTO
 695         def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
 696         select ARCH_MULTI_V5
 697
 698 endmenu
 699
 700 config ARCH_VIRT
 701         bool "Dummy Virtual Machine"
 702         depends on ARCH_MULTI_V7
 703         select ARM_AMBA
 704         select ARM_GIC
 705         select ARM_GIC_V2M if PCI
 706         select ARM_GIC_V3
 707         select ARM_GIC_V3_ITS if PCI
 708         select ARM_PSCI
 709         select HAVE_ARM_ARCH_TIMER
 710
 711 #
 712 # This is sorted alphabetically by mach-* pathname.  However, plat-*
 713 # Kconfigs may be included either alphabetically (according to the
 714 # plat- suffix) or along side the corresponding mach-* source.
 715 #
 716 source "arch/arm/mach-mvebu/Kconfig"
 717
 718 source "arch/arm/mach-actions/Kconfig"
 719
 720 source "arch/arm/mach-alpine/Kconfig"
 721
 722 source "arch/arm/mach-artpec/Kconfig"
 723
 724 source "arch/arm/mach-asm9260/Kconfig"
 725
 726 source "arch/arm/mach-at91/Kconfig"
 727
 728 source "arch/arm/mach-axxia/Kconfig"
 729
 730 source "arch/arm/mach-bcm/Kconfig"
 731
 732 source "arch/arm/mach-berlin/Kconfig"
 733
 734 source "arch/arm/mach-clps711x/Kconfig"
 735
 736 source "arch/arm/mach-cns3xxx/Kconfig"
 737
 738 source "arch/arm/mach-davinci/Kconfig"
 739
 740 source "arch/arm/mach-digicolor/Kconfig"
 741
 742 source "arch/arm/mach-dove/Kconfig"
 743
 744 source "arch/arm/mach-ep93xx/Kconfig"
 745
 746 source "arch/arm/mach-footbridge/Kconfig"
 747
 748 source "arch/arm/mach-gemini/Kconfig"
 749
 750 source "arch/arm/mach-highbank/Kconfig"
 751
 752 source "arch/arm/mach-hisi/Kconfig"
 753
 754 source "arch/arm/mach-integrator/Kconfig"
 755
 756 source "arch/arm/mach-iop32x/Kconfig"
 757
 758 source "arch/arm/mach-iop33x/Kconfig"
 759
 760 source "arch/arm/mach-iop13xx/Kconfig"
 761
 762 source "arch/arm/mach-ixp4xx/Kconfig"
 763
 764 source "arch/arm/mach-keystone/Kconfig"
 765
 766 source "arch/arm/mach-ks8695/Kconfig"
 767
 768 source "arch/arm/mach-meson/Kconfig"
 769
 770 source "arch/arm/mach-moxart/Kconfig"
 771
 772 source "arch/arm/mach-aspeed/Kconfig"
 773
 774 source "arch/arm/mach-mv78xx0/Kconfig"
 775
 776 source "arch/arm/mach-imx/Kconfig"
 777
 778 source "arch/arm/mach-mediatek/Kconfig"
 779
 780 source "arch/arm/mach-mxs/Kconfig"
 781
 782 source "arch/arm/mach-netx/Kconfig"
 783
 784 source "arch/arm/mach-nomadik/Kconfig"
 785
 786 source "arch/arm/mach-nspire/Kconfig"
 787
 788 source "arch/arm/plat-omap/Kconfig"
 789
 790 source "arch/arm/mach-omap1/Kconfig"
 791
 792 source "arch/arm/mach-omap2/Kconfig"
 793
 794 source "arch/arm/mach-orion5x/Kconfig"
 795
 796 source "arch/arm/mach-picoxcell/Kconfig"
 797
 798 source "arch/arm/mach-pxa/Kconfig"
 799 source "arch/arm/plat-pxa/Kconfig"
 800
 801 source "arch/arm/mach-mmp/Kconfig"
 802
 803 source "arch/arm/mach-oxnas/Kconfig"
 804
 805 source "arch/arm/mach-qcom/Kconfig"
 806
 807 source "arch/arm/mach-realview/Kconfig"
 808
 809 source "arch/arm/mach-rockchip/Kconfig"
 810
 811 source "arch/arm/mach-sa1100/Kconfig"
 812
 813 source "arch/arm/mach-socfpga/Kconfig"
 814
 815 source "arch/arm/mach-spear/Kconfig"
 816
 817 source "arch/arm/mach-sti/Kconfig"
 818
 819 source "arch/arm/mach-stm32/Kconfig"
 820
 821 source "arch/arm/mach-s3c24xx/Kconfig"
 822
 823 source "arch/arm/mach-s3c64xx/Kconfig"
 824
 825 source "arch/arm/mach-s5pv210/Kconfig"
 826
 827 source "arch/arm/mach-exynos/Kconfig"
 828 source "arch/arm/plat-samsung/Kconfig"
 829
 830 source "arch/arm/mach-shmobile/Kconfig"
 831
 832 source "arch/arm/mach-sunxi/Kconfig"
 833
 834 source "arch/arm/mach-prima2/Kconfig"
 835
 836 source "arch/arm/mach-tango/Kconfig"
 837
 838 source "arch/arm/mach-tegra/Kconfig"
 839
 840 source "arch/arm/mach-u300/Kconfig"
 841
 842 source "arch/arm/mach-uniphier/Kconfig"
 843
 844 source "arch/arm/mach-ux500/Kconfig"
 845
 846 source "arch/arm/mach-versatile/Kconfig"
 847
 848 source "arch/arm/mach-vexpress/Kconfig"
 849 source "arch/arm/plat-versatile/Kconfig"
 850
 851 source "arch/arm/mach-vt8500/Kconfig"
 852
 853 source "arch/arm/mach-w90x900/Kconfig"
 854
 855 source "arch/arm/mach-zx/Kconfig"
 856
 857 source "arch/arm/mach-zynq/Kconfig"
 858
 859 # ARMv7-M architecture
 860 config ARCH_EFM32
 861         bool "Energy Micro efm32"
 862         depends on ARM_SINGLE_ARMV7M
 863         select GPIOLIB
 864         help
 865           Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
 866           processors.
 867
 868 config ARCH_LPC18XX
 869         bool "NXP LPC18xx/LPC43xx"
 870         depends on ARM_SINGLE_ARMV7M
 871         select ARCH_HAS_RESET_CONTROLLER
 872         select ARM_AMBA
 873         select CLKSRC_LPC32XX
 874         select PINCTRL
 875         help
 876           Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
 877           high performance microcontrollers.
 878
 879 config ARCH_MPS2
 880         bool "ARM MPS2 platform"
 881         depends on ARM_SINGLE_ARMV7M
 882         select ARM_AMBA
 883         select CLKSRC_MPS2
 884         help
 885           Support for Cortex-M Prototyping System (or V2M-MPS2) which comes
 886           with a range of available cores like Cortex-M3/M4/M7.
 887
 888           Please, note that depends which Application Note is used memory map
 889           for the platform may vary, so adjustment of RAM base might be needed.
 890
 891 # Definitions to make life easier
 892 config ARCH_ACORN
 893         bool
 894
 895 config PLAT_IOP
 896         bool
 897         select GENERIC_CLOCKEVENTS
 898
 899 config PLAT_ORION
 900         bool
 901         select CLKSRC_MMIO
 902         select COMMON_CLK
 903         select GENERIC_IRQ_CHIP
 904         select IRQ_DOMAIN
 905
 906 config PLAT_ORION_LEGACY
 907         bool
 908         select PLAT_ORION
 909
 910 config PLAT_PXA
 911         bool
 912
 913 config PLAT_VERSATILE
 914         bool
 915
 916 source "arch/arm/firmware/Kconfig"
 917
 918 source arch/arm/mm/Kconfig
 919
 920 config IWMMXT
 921         bool "Enable iWMMXt support"
 922         depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
 923         default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
 924         help
 925           Enable support for iWMMXt context switching at run time if
 926           running on a CPU that supports it.
 927
 928 config MULTI_IRQ_HANDLER
 929         bool
 930         help
 931           Allow each machine to specify it's own IRQ handler at run time.
 932
 933 if !MMU
 934 source "arch/arm/Kconfig-nommu"
 935 endif
 936
 937 config PJ4B_ERRATA_4742
 938         bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
 939         depends on CPU_PJ4B && MACH_ARMADA_370
 940         default y
 941         help
 942           When coming out of either a Wait for Interrupt (WFI) or a Wait for
 943           Event (WFE) IDLE states, a specific timing sensitivity exists between
 944           the retiring WFI/WFE instructions and the newly issued subsequent
 945           instructions.  This sensitivity can result in a CPU hang scenario.
 946           Workaround:
 947           The software must insert either a Data Synchronization Barrier (DSB)
 948           or Data Memory Barrier (DMB) command immediately after the WFI/WFE
 949           instruction
 950
 951 config ARM_ERRATA_326103
 952         bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
 953         depends on CPU_V6
 954         help
 955           Executing a SWP instruction to read-only memory does not set bit 11
 956           of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
 957           treat the access as a read, preventing a COW from occurring and
 958           causing the faulting task to livelock.
 959
 960 config ARM_ERRATA_411920
 961         bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
 962         depends on CPU_V6 || CPU_V6K
 963         help
 964           Invalidation of the Instruction Cache operation can
 965           fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
 966           It does not affect the MPCore. This option enables the ARM Ltd.
 967           recommended workaround.
 968
 969 config ARM_ERRATA_430973
 970         bool "ARM errata: Stale prediction on replaced interworking branch"
 971         depends on CPU_V7
 972         help
 973           This option enables the workaround for the 430973 Cortex-A8
 974           r1p* erratum. If a code sequence containing an ARM/Thumb
 975           interworking branch is replaced with another code sequence at the
 976           same virtual address, whether due to self-modifying code or virtual
 977           to physical address re-mapping, Cortex-A8 does not recover from the
 978           stale interworking branch prediction. This results in Cortex-A8
 979           executing the new code sequence in the incorrect ARM or Thumb state.
 980           The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
 981           and also flushes the branch target cache at every context switch.
 982           Note that setting specific bits in the ACTLR register may not be
 983           available in non-secure mode.
 984
 985 config ARM_ERRATA_458693
 986         bool "ARM errata: Processor deadlock when a false hazard is created"
 987         depends on CPU_V7
 988         depends on !ARCH_MULTIPLATFORM
 989         help
 990           This option enables the workaround for the 458693 Cortex-A8 (r2p0)
 991           erratum. For very specific sequences of memory operations, it is
 992           possible for a hazard condition intended for a cache line to instead
 993           be incorrectly associated with a different cache line. This false
 994           hazard might then cause a processor deadlock. The workaround enables
 995           the L1 caching of the NEON accesses and disables the PLD instruction
 996           in the ACTLR register. Note that setting specific bits in the ACTLR
 997           register may not be available in non-secure mode.
 998
 999 config ARM_ERRATA_460075
1000         bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1001         depends on CPU_V7
1002         depends on !ARCH_MULTIPLATFORM
1003         help
1004           This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1005           erratum. Any asynchronous access to the L2 cache may encounter a
1006           situation in which recent store transactions to the L2 cache are lost
1007           and overwritten with stale memory contents from external memory. The
1008           workaround disables the write-allocate mode for the L2 cache via the
1009           ACTLR register. Note that setting specific bits in the ACTLR register
1010           may not be available in non-secure mode.
1011
1012 config ARM_ERRATA_742230
1013         bool "ARM errata: DMB operation may be faulty"
1014         depends on CPU_V7 && SMP
1015         depends on !ARCH_MULTIPLATFORM
1016         help
1017           This option enables the workaround for the 742230 Cortex-A9
1018           (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1019           between two write operations may not ensure the correct visibility
1020           ordering of the two writes. This workaround sets a specific bit in
1021           the diagnostic register of the Cortex-A9 which causes the DMB
1022           instruction to behave as a DSB, ensuring the correct behaviour of
1023           the two writes.
1024
1025 config ARM_ERRATA_742231
1026         bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1027         depends on CPU_V7 && SMP
1028         depends on !ARCH_MULTIPLATFORM
1029         help
1030           This option enables the workaround for the 742231 Cortex-A9
1031           (r2p0..r2p2) erratum. Under certain conditions, specific to the
1032           Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1033           accessing some data located in the same cache line, may get corrupted
1034           data due to bad handling of the address hazard when the line gets
1035           replaced from one of the CPUs at the same time as another CPU is
1036           accessing it. This workaround sets specific bits in the diagnostic
1037           register of the Cortex-A9 which reduces the linefill issuing
1038           capabilities of the processor.
1039
1040 config ARM_ERRATA_643719
1041         bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1042         depends on CPU_V7 && SMP
1043         default y
1044         help
1045           This option enables the workaround for the 643719 Cortex-A9 (prior to
1046           r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1047           register returns zero when it should return one. The workaround
1048           corrects this value, ensuring cache maintenance operations which use
1049           it behave as intended and avoiding data corruption.
1050
1051 config ARM_ERRATA_720789
1052         bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1053         depends on CPU_V7
1054         help
1055           This option enables the workaround for the 720789 Cortex-A9 (prior to
1056           r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1057           broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1058           As a consequence of this erratum, some TLB entries which should be
1059           invalidated are not, resulting in an incoherency in the system page
1060           tables. The workaround changes the TLB flushing routines to invalidate
1061           entries regardless of the ASID.
1062
1063 config ARM_ERRATA_743622
1064         bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1065         depends on CPU_V7
1066         depends on !ARCH_MULTIPLATFORM
1067         help
1068           This option enables the workaround for the 743622 Cortex-A9
1069           (r2p*) erratum. Under very rare conditions, a faulty
1070           optimisation in the Cortex-A9 Store Buffer may lead to data
1071           corruption. This workaround sets a specific bit in the diagnostic
1072           register of the Cortex-A9 which disables the Store Buffer
1073           optimisation, preventing the defect from occurring. This has no
1074           visible impact on the overall performance or power consumption of the
1075           processor.
1076
1077 config ARM_ERRATA_751472
1078         bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1079         depends on CPU_V7
1080         depends on !ARCH_MULTIPLATFORM
1081         help
1082           This option enables the workaround for the 751472 Cortex-A9 (prior
1083           to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1084           completion of a following broadcasted operation if the second
1085           operation is received by a CPU before the ICIALLUIS has completed,
1086           potentially leading to corrupted entries in the cache or TLB.
1087
1088 config ARM_ERRATA_754322
1089         bool "ARM errata: possible faulty MMU translations following an ASID switch"
1090         depends on CPU_V7
1091         help
1092           This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1093           r3p*) erratum. A speculative memory access may cause a page table walk
1094           which starts prior to an ASID switch but completes afterwards. This
1095           can populate the micro-TLB with a stale entry which may be hit with
1096           the new ASID. This workaround places two dsb instructions in the mm
1097           switching code so that no page table walks can cross the ASID switch.
1098
1099 config ARM_ERRATA_754327
1100         bool "ARM errata: no automatic Store Buffer drain"
1101         depends on CPU_V7 && SMP
1102         help
1103           This option enables the workaround for the 754327 Cortex-A9 (prior to
1104           r2p0) erratum. The Store Buffer does not have any automatic draining
1105           mechanism and therefore a livelock may occur if an external agent
1106           continuously polls a memory location waiting to observe an update.
1107           This workaround defines cpu_relax() as smp_mb(), preventing correctly
1108           written polling loops from denying visibility of updates to memory.
1109
1110 config ARM_ERRATA_364296
1111         bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1112         depends on CPU_V6
1113         help
1114           This options enables the workaround for the 364296 ARM1136
1115           r0p2 erratum (possible cache data corruption with
1116           hit-under-miss enabled). It sets the undocumented bit 31 in
1117           the auxiliary control register and the FI bit in the control
1118           register, thus disabling hit-under-miss without putting the
1119           processor into full low interrupt latency mode. ARM11MPCore
1120           is not affected.
1121
1122 config ARM_ERRATA_764369
1123         bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1124         depends on CPU_V7 && SMP
1125         help
1126           This option enables the workaround for erratum 764369
1127           affecting Cortex-A9 MPCore with two or more processors (all
1128           current revisions). Under certain timing circumstances, a data
1129           cache line maintenance operation by MVA targeting an Inner
1130           Shareable memory region may fail to proceed up to either the
1131           Point of Coherency or to the Point of Unification of the
1132           system. This workaround adds a DSB instruction before the
1133           relevant cache maintenance functions and sets a specific bit
1134           in the diagnostic control register of the SCU.
1135
1136 config ARM_ERRATA_775420
1137        bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1138        depends on CPU_V7
1139        help
1140          This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1141          r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1142          operation aborts with MMU exception, it might cause the processor
1143          to deadlock. This workaround puts DSB before executing ISB if
1144          an abort may occur on cache maintenance.
1145
1146 config ARM_ERRATA_798181
1147         bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1148         depends on CPU_V7 && SMP
1149         help
1150           On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1151           adequately shooting down all use of the old entries. This
1152           option enables the Linux kernel workaround for this erratum
1153           which sends an IPI to the CPUs that are running the same ASID
1154           as the one being invalidated.
1155
1156 config ARM_ERRATA_773022
1157         bool "ARM errata: incorrect instructions may be executed from loop buffer"
1158         depends on CPU_V7
1159         help
1160           This option enables the workaround for the 773022 Cortex-A15
1161           (up to r0p4) erratum. In certain rare sequences of code, the
1162           loop buffer may deliver incorrect instructions. This
1163           workaround disables the loop buffer to avoid the erratum.
1164
1165 config ARM_ERRATA_818325_852422
1166         bool "ARM errata: A12: some seqs of opposed cond code instrs => deadlock or corruption"
1167         depends on CPU_V7
1168         help
1169           This option enables the workaround for:
1170           - Cortex-A12 818325: Execution of an UNPREDICTABLE STR or STM
1171             instruction might deadlock.  Fixed in r0p1.
1172           - Cortex-A12 852422: Execution of a sequence of instructions might
1173             lead to either a data corruption or a CPU deadlock.  Not fixed in
1174             any Cortex-A12 cores yet.
1175           This workaround for all both errata involves setting bit[12] of the
1176           Feature Register. This bit disables an optimisation applied to a
1177           sequence of 2 instructions that use opposing condition codes.
1178
1179 config ARM_ERRATA_821420
1180         bool "ARM errata: A12: sequence of VMOV to core registers might lead to a dead lock"
1181         depends on CPU_V7
1182         help
1183           This option enables the workaround for the 821420 Cortex-A12
1184           (all revs) erratum. In very rare timing conditions, a sequence
1185           of VMOV to Core registers instructions, for which the second
1186           one is in the shadow of a branch or abort, can lead to a
1187           deadlock when the VMOV instructions are issued out-of-order.
1188
1189 config ARM_ERRATA_825619
1190         bool "ARM errata: A12: DMB NSHST/ISHST mixed ... might cause deadlock"
1191         depends on CPU_V7
1192         help
1193           This option enables the workaround for the 825619 Cortex-A12
1194           (all revs) erratum. Within rare timing constraints, executing a
1195           DMB NSHST or DMB ISHST instruction followed by a mix of Cacheable
1196           and Device/Strongly-Ordered loads and stores might cause deadlock
1197
1198 config ARM_ERRATA_852421
1199         bool "ARM errata: A17: DMB ST might fail to create order between stores"
1200         depends on CPU_V7
1201         help
1202           This option enables the workaround for the 852421 Cortex-A17
1203           (r1p0, r1p1, r1p2) erratum. Under very rare timing conditions,
1204           execution of a DMB ST instruction might fail to properly order
1205           stores from GroupA and stores from GroupB.
1206
1207 config ARM_ERRATA_852423
1208         bool "ARM errata: A17: some seqs of opposed cond code instrs => deadlock or corruption"
1209         depends on CPU_V7
1210         help
1211           This option enables the workaround for:
1212           - Cortex-A17 852423: Execution of a sequence of instructions might
1213             lead to either a data corruption or a CPU deadlock.  Not fixed in
1214             any Cortex-A17 cores yet.
1215           This is identical to Cortex-A12 erratum 852422.  It is a separate
1216           config option from the A12 erratum due to the way errata are checked
1217           for and handled.
1218
1219 endmenu
1220
1221 source "arch/arm/common/Kconfig"
1222
1223 menu "Bus support"
1224
1225 config ISA
1226         bool
1227         help
1228           Find out whether you have ISA slots on your motherboard.  ISA is the
1229           name of a bus system, i.e. the way the CPU talks to the other stuff
1230           inside your box.  Other bus systems are PCI, EISA, MicroChannel
1231           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1232           newer boards don't support it.  If you have ISA, say Y, otherwise N.
1233
1234 # Select ISA DMA controller support
1235 config ISA_DMA
1236         bool
1237         select ISA_DMA_API
1238
1239 # Select ISA DMA interface
1240 config ISA_DMA_API
1241         bool
1242
1243 config PCI
1244         bool "PCI support" if MIGHT_HAVE_PCI
1245         help
1246           Find out whether you have a PCI motherboard. PCI is the name of a
1247           bus system, i.e. the way the CPU talks to the other stuff inside
1248           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1249           VESA. If you have PCI, say Y, otherwise N.
1250
1251 config PCI_DOMAINS
1252         bool
1253         depends on PCI
1254
1255 config PCI_DOMAINS_GENERIC
1256         def_bool PCI_DOMAINS
1257
1258 config PCI_NANOENGINE
1259         bool "BSE nanoEngine PCI support"
1260         depends on SA1100_NANOENGINE
1261         help
1262           Enable PCI on the BSE nanoEngine board.
1263
1264 config PCI_SYSCALL
1265         def_bool PCI
1266
1267 config PCI_HOST_ITE8152
1268         bool
1269         depends on PCI && MACH_ARMCORE
1270         default y
1271         select DMABOUNCE
1272
1273 source "drivers/pci/Kconfig"
1274
1275 source "drivers/pcmcia/Kconfig"
1276
1277 endmenu
1278
1279 menu "Kernel Features"
1280
1281 config HAVE_SMP
1282         bool
1283         help
1284           This option should be selected by machines which have an SMP-
1285           capable CPU.
1286
1287           The only effect of this option is to make the SMP-related
1288           options available to the user for configuration.
1289
1290 config SMP
1291         bool "Symmetric Multi-Processing"
1292         depends on CPU_V6K || CPU_V7
1293         depends on GENERIC_CLOCKEVENTS
1294         depends on HAVE_SMP
1295         depends on MMU || ARM_MPU
1296         select IRQ_WORK
1297         help
1298           This enables support for systems with more than one CPU. If you have
1299           a system with only one CPU, say N. If you have a system with more
1300           than one CPU, say Y.
1301
1302           If you say N here, the kernel will run on uni- and multiprocessor
1303           machines, but will use only one CPU of a multiprocessor machine. If
1304           you say Y here, the kernel will run on many, but not all,
1305           uniprocessor machines. On a uniprocessor machine, the kernel
1306           will run faster if you say N here.
1307
1308           See also <file:Documentation/x86/i386/IO-APIC.txt>,
1309           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1310           <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1311
1312           If you don't know what to do here, say N.
1313
1314 config SMP_ON_UP
1315         bool "Allow booting SMP kernel on uniprocessor systems"
1316         depends on SMP && !XIP_KERNEL && MMU
1317         default y
1318         help
1319           SMP kernels contain instructions which fail on non-SMP processors.
1320           Enabling this option allows the kernel to modify itself to make
1321           these instructions safe.  Disabling it allows about 1K of space
1322           savings.
1323
1324           If you don't know what to do here, say Y.
1325
1326 config ARM_CPU_TOPOLOGY
1327         bool "Support cpu topology definition"
1328         depends on SMP && CPU_V7
1329         default y
1330         help
1331           Support ARM cpu topology definition. The MPIDR register defines
1332           affinity between processors which is then used to describe the cpu
1333           topology of an ARM System.
1334
1335 config SCHED_MC
1336         bool "Multi-core scheduler support"
1337         depends on ARM_CPU_TOPOLOGY
1338         help
1339           Multi-core scheduler support improves the CPU scheduler's decision
1340           making when dealing with multi-core CPU chips at a cost of slightly
1341           increased overhead in some places. If unsure say N here.
1342
1343 config SCHED_SMT
1344         bool "SMT scheduler support"
1345         depends on ARM_CPU_TOPOLOGY
1346         help
1347           Improves the CPU scheduler's decision making when dealing with
1348           MultiThreading at a cost of slightly increased overhead in some
1349           places. If unsure say N here.
1350
1351 config HAVE_ARM_SCU
1352         bool
1353         help
1354           This option enables support for the ARM system coherency unit
1355
1356 config HAVE_ARM_ARCH_TIMER
1357         bool "Architected timer support"
1358         depends on CPU_V7
1359         select ARM_ARCH_TIMER
1360         select GENERIC_CLOCKEVENTS
1361         help
1362           This option enables support for the ARM architected timer
1363
1364 config HAVE_ARM_TWD
1365         bool
1366         select TIMER_OF if OF
1367         help
1368           This options enables support for the ARM timer and watchdog unit
1369
1370 config MCPM
1371         bool "Multi-Cluster Power Management"
1372         depends on CPU_V7 && SMP
1373         help
1374           This option provides the common power management infrastructure
1375           for (multi-)cluster based systems, such as big.LITTLE based
1376           systems.
1377
1378 config MCPM_QUAD_CLUSTER
1379         bool
1380         depends on MCPM
1381         help
1382           To avoid wasting resources unnecessarily, MCPM only supports up
1383           to 2 clusters by default.
1384           Platforms with 3 or 4 clusters that use MCPM must select this
1385           option to allow the additional clusters to be managed.
1386
1387 config BIG_LITTLE
1388         bool "big.LITTLE support (Experimental)"
1389         depends on CPU_V7 && SMP
1390         select MCPM
1391         help
1392           This option enables support selections for the big.LITTLE
1393           system architecture.
1394
1395 config BL_SWITCHER
1396         bool "big.LITTLE switcher support"
1397         depends on BIG_LITTLE && MCPM && HOTPLUG_CPU && ARM_GIC
1398         select CPU_PM
1399         help
1400           The big.LITTLE "switcher" provides the core functionality to
1401           transparently handle transition between a cluster of A15's
1402           and a cluster of A7's in a big.LITTLE system.
1403
1404 config BL_SWITCHER_DUMMY_IF
1405         tristate "Simple big.LITTLE switcher user interface"
1406         depends on BL_SWITCHER && DEBUG_KERNEL
1407         help
1408           This is a simple and dummy char dev interface to control
1409           the big.LITTLE switcher core code.  It is meant for
1410           debugging purposes only.
1411
1412 choice
1413         prompt "Memory split"
1414         depends on MMU
1415         default VMSPLIT_3G
1416         help
1417           Select the desired split between kernel and user memory.
1418
1419           If you are not absolutely sure what you are doing, leave this
1420           option alone!
1421
1422         config VMSPLIT_3G
1423                 bool "3G/1G user/kernel split"
1424         config VMSPLIT_3G_OPT
1425                 depends on !ARM_LPAE
1426                 bool "3G/1G user/kernel split (for full 1G low memory)"
1427         config VMSPLIT_2G
1428                 bool "2G/2G user/kernel split"
1429         config VMSPLIT_1G
1430                 bool "1G/3G user/kernel split"
1431 endchoice
1432
1433 config PAGE_OFFSET
1434         hex
1435         default PHYS_OFFSET if !MMU
1436         default 0x40000000 if VMSPLIT_1G
1437         default 0x80000000 if VMSPLIT_2G
1438         default 0xB0000000 if VMSPLIT_3G_OPT
1439         default 0xC0000000
1440
1441 config NR_CPUS
1442         int "Maximum number of CPUs (2-32)"
1443         range 2 32
1444         depends on SMP
1445         default "4"
1446
1447 config HOTPLUG_CPU
1448         bool "Support for hot-pluggable CPUs"
1449         depends on SMP
1450         help
1451           Say Y here to experiment with turning CPUs off and on.  CPUs
1452           can be controlled through /sys/devices/system/cpu.
1453
1454 config ARM_PSCI
1455         bool "Support for the ARM Power State Coordination Interface (PSCI)"
1456         depends on HAVE_ARM_SMCCC
1457         select ARM_PSCI_FW
1458         help
1459           Say Y here if you want Linux to communicate with system firmware
1460           implementing the PSCI specification for CPU-centric power
1461           management operations described in ARM document number ARM DEN
1462           0022A ("Power State Coordination Interface System Software on
1463           ARM processors").
1464
1465 # The GPIO number here must be sorted by descending number. In case of
1466 # a multiplatform kernel, we just want the highest value required by the
1467 # selected platforms.
1468 config ARCH_NR_GPIO
1469         int
1470         default 2048 if ARCH_SOCFPGA
1471         default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1472                 ARCH_ZYNQ
1473         default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1474                 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1475         default 416 if ARCH_SUNXI
1476         default 392 if ARCH_U8500
1477         default 352 if ARCH_VT8500
1478         default 288 if ARCH_ROCKCHIP
1479         default 264 if MACH_H4700
1480         default 0
1481         help
1482           Maximum number of GPIOs in the system.
1483
1484           If unsure, leave the default value.
1485
1486 source kernel/Kconfig.preempt
1487
1488 config HZ_FIXED
1489         int
1490         default 200 if ARCH_EBSA110
1491         default 128 if SOC_AT91RM9200
1492         default 0
1493
1494 choice
1495         depends on HZ_FIXED = 0
1496         prompt "Timer frequency"
1497
1498 config HZ_100
1499         bool "100 Hz"
1500
1501 config HZ_200
1502         bool "200 Hz"
1503
1504 config HZ_250
1505         bool "250 Hz"
1506
1507 config HZ_300
1508         bool "300 Hz"
1509
1510 config HZ_500
1511         bool "500 Hz"
1512
1513 config HZ_1000
1514         bool "1000 Hz"
1515
1516 endchoice
1517
1518 config HZ
1519         int
1520         default HZ_FIXED if HZ_FIXED != 0
1521         default 100 if HZ_100
1522         default 200 if HZ_200
1523         default 250 if HZ_250
1524         default 300 if HZ_300
1525         default 500 if HZ_500
1526         default 1000
1527
1528 config SCHED_HRTICK
1529         def_bool HIGH_RES_TIMERS
1530
1531 config THUMB2_KERNEL
1532         bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1533         depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1534         default y if CPU_THUMBONLY
1535         select ARM_ASM_UNIFIED
1536         select ARM_UNWIND
1537         help
1538           By enabling this option, the kernel will be compiled in
1539           Thumb-2 mode. A compiler/assembler that understand the unified
1540           ARM-Thumb syntax is needed.
1541
1542           If unsure, say N.
1543
1544 config THUMB2_AVOID_R_ARM_THM_JUMP11
1545         bool "Work around buggy Thumb-2 short branch relocations in gas"
1546         depends on THUMB2_KERNEL && MODULES
1547         default y
1548         help
1549           Various binutils versions can resolve Thumb-2 branches to
1550           locally-defined, preemptible global symbols as short-range "b.n"
1551           branch instructions.
1552
1553           This is a problem, because there's no guarantee the final
1554           destination of the symbol, or any candidate locations for a
1555           trampoline, are within range of the branch.  For this reason, the
1556           kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1557           relocation in modules at all, and it makes little sense to add
1558           support.
1559
1560           The symptom is that the kernel fails with an "unsupported
1561           relocation" error when loading some modules.
1562
1563           Until fixed tools are available, passing
1564           -fno-optimize-sibling-calls to gcc should prevent gcc generating
1565           code which hits this problem, at the cost of a bit of extra runtime
1566           stack usage in some cases.
1567
1568           The problem is described in more detail at:
1569               https://bugs.launchpad.net/binutils-linaro/+bug/725126
1570
1571           Only Thumb-2 kernels are affected.
1572
1573           Unless you are sure your tools don't have this problem, say Y.
1574
1575 config ARM_ASM_UNIFIED
1576         bool
1577
1578 config ARM_PATCH_IDIV
1579         bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()"
1580         depends on CPU_32v7 && !XIP_KERNEL
1581         default y
1582         help
1583           The ARM compiler inserts calls to __aeabi_idiv() and
1584           __aeabi_uidiv() when it needs to perform division on signed
1585           and unsigned integers. Some v7 CPUs have support for the sdiv
1586           and udiv instructions that can be used to implement those
1587           functions.
1588
1589           Enabling this option allows the kernel to modify itself to
1590           replace the first two instructions of these library functions
1591           with the sdiv or udiv plus "bx lr" instructions when the CPU
1592           it is running on supports them. Typically this will be faster
1593           and less power intensive than running the original library
1594           code to do integer division.
1595
1596 config AEABI
1597         bool "Use the ARM EABI to compile the kernel" if !CPU_V7 && !CPU_V7M && !CPU_V6 && !CPU_V6K
1598         default CPU_V7 || CPU_V7M || CPU_V6 || CPU_V6K
1599         help
1600           This option allows for the kernel to be compiled using the latest
1601           ARM ABI (aka EABI).  This is only useful if you are using a user
1602           space environment that is also compiled with EABI.
1603
1604           Since there are major incompatibilities between the legacy ABI and
1605           EABI, especially with regard to structure member alignment, this
1606           option also changes the kernel syscall calling convention to
1607           disambiguate both ABIs and allow for backward compatibility support
1608           (selected with CONFIG_OABI_COMPAT).
1609
1610           To use this you need GCC version 4.0.0 or later.
1611
1612 config OABI_COMPAT
1613         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1614         depends on AEABI && !THUMB2_KERNEL
1615         help
1616           This option preserves the old syscall interface along with the
1617           new (ARM EABI) one. It also provides a compatibility layer to
1618           intercept syscalls that have structure arguments which layout
1619           in memory differs between the legacy ABI and the new ARM EABI
1620           (only for non "thumb" binaries). This option adds a tiny
1621           overhead to all syscalls and produces a slightly larger kernel.
1622
1623           The seccomp filter system will not be available when this is
1624           selected, since there is no way yet to sensibly distinguish
1625           between calling conventions during filtering.
1626
1627           If you know you'll be using only pure EABI user space then you
1628           can say N here. If this option is not selected and you attempt
1629           to execute a legacy ABI binary then the result will be
1630           UNPREDICTABLE (in fact it can be predicted that it won't work
1631           at all). If in doubt say N.
1632
1633 config ARCH_HAS_HOLES_MEMORYMODEL
1634         bool
1635
1636 config ARCH_SPARSEMEM_ENABLE
1637         bool
1638
1639 config ARCH_SPARSEMEM_DEFAULT
1640         def_bool ARCH_SPARSEMEM_ENABLE
1641
1642 config ARCH_SELECT_MEMORY_MODEL
1643         def_bool ARCH_SPARSEMEM_ENABLE
1644
1645 config HAVE_ARCH_PFN_VALID
1646         def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1647
1648 config HAVE_GENERIC_GUP
1649         def_bool y
1650         depends on ARM_LPAE
1651
1652 config HIGHMEM
1653         bool "High Memory Support"
1654         depends on MMU
1655         help
1656           The address space of ARM processors is only 4 Gigabytes large
1657           and it has to accommodate user address space, kernel address
1658           space as well as some memory mapped IO. That means that, if you
1659           have a large amount of physical memory and/or IO, not all of the
1660           memory can be "permanently mapped" by the kernel. The physical
1661           memory that is not permanently mapped is called "high memory".
1662
1663           Depending on the selected kernel/user memory split, minimum
1664           vmalloc space and actual amount of RAM, you may not need this
1665           option which should result in a slightly faster kernel.
1666
1667           If unsure, say n.
1668
1669 config HIGHPTE
1670         bool "Allocate 2nd-level pagetables from highmem" if EXPERT
1671         depends on HIGHMEM
1672         default y
1673         help
1674           The VM uses one page of physical memory for each page table.
1675           For systems with a lot of processes, this can use a lot of
1676           precious low memory, eventually leading to low memory being
1677           consumed by page tables.  Setting this option will allow
1678           user-space 2nd level page tables to reside in high memory.
1679
1680 config CPU_SW_DOMAIN_PAN
1681         bool "Enable use of CPU domains to implement privileged no-access"
1682         depends on MMU && !ARM_LPAE
1683         default y
1684         help
1685           Increase kernel security by ensuring that normal kernel accesses
1686           are unable to access userspace addresses.  This can help prevent
1687           use-after-free bugs becoming an exploitable privilege escalation
1688           by ensuring that magic values (such as LIST_POISON) will always
1689           fault when dereferenced.
1690
1691           CPUs with low-vector mappings use a best-efforts implementation.
1692           Their lower 1MB needs to remain accessible for the vectors, but
1693           the remainder of userspace will become appropriately inaccessible.
1694
1695 config HW_PERF_EVENTS
1696         def_bool y
1697         depends on ARM_PMU
1698
1699 config SYS_SUPPORTS_HUGETLBFS
1700        def_bool y
1701        depends on ARM_LPAE
1702
1703 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1704        def_bool y
1705        depends on ARM_LPAE
1706
1707 config ARCH_WANT_GENERAL_HUGETLB
1708         def_bool y
1709
1710 config ARM_MODULE_PLTS
1711         bool "Use PLTs to allow module memory to spill over into vmalloc area"
1712         depends on MODULES
1713         help
1714           Allocate PLTs when loading modules so that jumps and calls whose
1715           targets are too far away for their relative offsets to be encoded
1716           in the instructions themselves can be bounced via veneers in the
1717           module's PLT. This allows modules to be allocated in the generic
1718           vmalloc area after the dedicated module memory area has been
1719           exhausted. The modules will use slightly more memory, but after
1720           rounding up to page size, the actual memory footprint is usually
1721           the same.
1722
1723           Say y if you are getting out of memory errors while loading modules
1724
1725 source "mm/Kconfig"
1726
1727 config FORCE_MAX_ZONEORDER
1728         int "Maximum zone order"
1729         default "12" if SOC_AM33XX
1730         default "9" if SA1111 || ARCH_EFM32
1731         default "11"
1732         help
1733           The kernel memory allocator divides physically contiguous memory
1734           blocks into "zones", where each zone is a power of two number of
1735           pages.  This option selects the largest power of two that the kernel
1736           keeps in the memory allocator.  If you need to allocate very large
1737           blocks of physically contiguous memory, then you may need to
1738           increase this value.
1739
1740           This config option is actually maximum order plus one. For example,
1741           a value of 11 means that the largest free memory block is 2^10 pages.
1742
1743 config ALIGNMENT_TRAP
1744         bool
1745         depends on CPU_CP15_MMU
1746         default y if !ARCH_EBSA110
1747         select HAVE_PROC_CPU if PROC_FS
1748         help
1749           ARM processors cannot fetch/store information which is not
1750           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1751           address divisible by 4. On 32-bit ARM processors, these non-aligned
1752           fetch/store instructions will be emulated in software if you say
1753           here, which has a severe performance impact. This is necessary for
1754           correct operation of some network protocols. With an IP-only
1755           configuration it is safe to say N, otherwise say Y.
1756
1757 config UACCESS_WITH_MEMCPY
1758         bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1759         depends on MMU
1760         default y if CPU_FEROCEON
1761         help
1762           Implement faster copy_to_user and clear_user methods for CPU
1763           cores where a 8-word STM instruction give significantly higher
1764           memory write throughput than a sequence of individual 32bit stores.
1765
1766           A possible side effect is a slight increase in scheduling latency
1767           between threads sharing the same address space if they invoke
1768           such copy operations with large buffers.
1769
1770           However, if the CPU data cache is using a write-allocate mode,
1771           this option is unlikely to provide any performance gain.
1772
1773 config SECCOMP
1774         bool
1775         prompt "Enable seccomp to safely compute untrusted bytecode"
1776         ---help---
1777           This kernel feature is useful for number crunching applications
1778           that may need to compute untrusted bytecode during their
1779           execution. By using pipes or other transports made available to
1780           the process as file descriptors supporting the read/write
1781           syscalls, it's possible to isolate those applications in
1782           their own address space using seccomp. Once seccomp is
1783           enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1784           and the task is only allowed to execute a few safe syscalls
1785           defined by each seccomp mode.
1786
1787 config SWIOTLB
1788         def_bool y
1789
1790 config IOMMU_HELPER
1791         def_bool SWIOTLB
1792
1793 config PARAVIRT
1794         bool "Enable paravirtualization code"
1795         help
1796           This changes the kernel so it can modify itself when it is run
1797           under a hypervisor, potentially improving performance significantly
1798           over full virtualization.
1799
1800 config PARAVIRT_TIME_ACCOUNTING
1801         bool "Paravirtual steal time accounting"
1802         select PARAVIRT
1803         default n
1804         help
1805           Select this option to enable fine granularity task steal time
1806           accounting. Time spent executing other tasks in parallel with
1807           the current vCPU is discounted from the vCPU power. To account for
1808           that, there can be a small performance impact.
1809
1810           If in doubt, say N here.
1811
1812 config XEN_DOM0
1813         def_bool y
1814         depends on XEN
1815
1816 config XEN
1817         bool "Xen guest support on ARM"
1818         depends on ARM && AEABI && OF
1819         depends on CPU_V7 && !CPU_V6
1820         depends on !GENERIC_ATOMIC64
1821         depends on MMU
1822         select ARCH_DMA_ADDR_T_64BIT
1823         select ARM_PSCI
1824         select SWIOTLB_XEN
1825         select PARAVIRT
1826         help
1827           Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1828
1829 endmenu
1830
1831 menu "Boot options"
1832
1833 config USE_OF
1834         bool "Flattened Device Tree support"
1835         select IRQ_DOMAIN
1836         select OF
1837         help
1838           Include support for flattened device tree machine descriptions.
1839
1840 config ATAGS
1841         bool "Support for the traditional ATAGS boot data passing" if USE_OF
1842         default y
1843         help
1844           This is the traditional way of passing data to the kernel at boot
1845           time. If you are solely relying on the flattened device tree (or
1846           the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1847           to remove ATAGS support from your kernel binary.  If unsure,
1848           leave this to y.
1849
1850 config DEPRECATED_PARAM_STRUCT
1851         bool "Provide old way to pass kernel parameters"
1852         depends on ATAGS
1853         help
1854           This was deprecated in 2001 and announced to live on for 5 years.
1855           Some old boot loaders still use this way.
1856
1857 # Compressed boot loader in ROM.  Yes, we really want to ask about
1858 # TEXT and BSS so we preserve their values in the config files.
1859 config ZBOOT_ROM_TEXT
1860         hex "Compressed ROM boot loader base address"
1861         default "0"
1862         help
1863           The physical address at which the ROM-able zImage is to be
1864           placed in the target.  Platforms which normally make use of
1865           ROM-able zImage formats normally set this to a suitable
1866           value in their defconfig file.
1867
1868           If ZBOOT_ROM is not enabled, this has no effect.
1869
1870 config ZBOOT_ROM_BSS
1871         hex "Compressed ROM boot loader BSS address"
1872         default "0"
1873         help
1874           The base address of an area of read/write memory in the target
1875           for the ROM-able zImage which must be available while the
1876           decompressor is running. It must be large enough to hold the
1877           entire decompressed kernel plus an additional 128 KiB.
1878           Platforms which normally make use of ROM-able zImage formats
1879           normally set this to a suitable value in their defconfig file.
1880
1881           If ZBOOT_ROM is not enabled, this has no effect.
1882
1883 config ZBOOT_ROM
1884         bool "Compressed boot loader in ROM/flash"
1885         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1886         depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1887         help
1888           Say Y here if you intend to execute your compressed kernel image
1889           (zImage) directly from ROM or flash.  If unsure, say N.
1890
1891 config ARM_APPENDED_DTB
1892         bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1893         depends on OF
1894         help
1895           With this option, the boot code will look for a device tree binary
1896           (DTB) appended to zImage
1897           (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1898
1899           This is meant as a backward compatibility convenience for those
1900           systems with a bootloader that can't be upgraded to accommodate
1901           the documented boot protocol using a device tree.
1902
1903           Beware that there is very little in terms of protection against
1904           this option being confused by leftover garbage in memory that might
1905           look like a DTB header after a reboot if no actual DTB is appended
1906           to zImage.  Do not leave this option active in a production kernel
1907           if you don't intend to always append a DTB.  Proper passing of the
1908           location into r2 of a bootloader provided DTB is always preferable
1909           to this option.
1910
1911 config ARM_ATAG_DTB_COMPAT
1912         bool "Supplement the appended DTB with traditional ATAG information"
1913         depends on ARM_APPENDED_DTB
1914         help
1915           Some old bootloaders can't be updated to a DTB capable one, yet
1916           they provide ATAGs with memory configuration, the ramdisk address,
1917           the kernel cmdline string, etc.  Such information is dynamically
1918           provided by the bootloader and can't always be stored in a static
1919           DTB.  To allow a device tree enabled kernel to be used with such
1920           bootloaders, this option allows zImage to extract the information
1921           from the ATAG list and store it at run time into the appended DTB.
1922
1923 choice
1924         prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1925         default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1926
1927 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1928         bool "Use bootloader kernel arguments if available"
1929         help
1930           Uses the command-line options passed by the boot loader instead of
1931           the device tree bootargs property. If the boot loader doesn't provide
1932           any, the device tree bootargs property will be used.
1933
1934 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1935         bool "Extend with bootloader kernel arguments"
1936         help
1937           The command-line arguments provided by the boot loader will be
1938           appended to the the device tree bootargs property.
1939
1940 endchoice
1941
1942 config CMDLINE
1943         string "Default kernel command string"
1944         default ""
1945         help
1946           On some architectures (EBSA110 and CATS), there is currently no way
1947           for the boot loader to pass arguments to the kernel. For these
1948           architectures, you should supply some command-line options at build
1949           time by entering them here. As a minimum, you should specify the
1950           memory size and the root device (e.g., mem=64M root=/dev/nfs).
1951
1952 choice
1953         prompt "Kernel command line type" if CMDLINE != ""
1954         default CMDLINE_FROM_BOOTLOADER
1955         depends on ATAGS
1956
1957 config CMDLINE_FROM_BOOTLOADER
1958         bool "Use bootloader kernel arguments if available"
1959         help
1960           Uses the command-line options passed by the boot loader. If
1961           the boot loader doesn't provide any, the default kernel command
1962           string provided in CMDLINE will be used.
1963
1964 config CMDLINE_EXTEND
1965         bool "Extend bootloader kernel arguments"
1966         help
1967           The command-line arguments provided by the boot loader will be
1968           appended to the default kernel command string.
1969
1970 config CMDLINE_FORCE
1971         bool "Always use the default kernel command string"
1972         help
1973           Always use the default kernel command string, even if the boot
1974           loader passes other arguments to the kernel.
1975           This is useful if you cannot or don't want to change the
1976           command-line options your boot loader passes to the kernel.
1977 endchoice
1978
1979 config XIP_KERNEL
1980         bool "Kernel Execute-In-Place from ROM"
1981         depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1982         help
1983           Execute-In-Place allows the kernel to run from non-volatile storage
1984           directly addressable by the CPU, such as NOR flash. This saves RAM
1985           space since the text section of the kernel is not loaded from flash
1986           to RAM.  Read-write sections, such as the data section and stack,
1987           are still copied to RAM.  The XIP kernel is not compressed since
1988           it has to run directly from flash, so it will take more space to
1989           store it.  The flash address used to link the kernel object files,
1990           and for storing it, is configuration dependent. Therefore, if you
1991           say Y here, you must know the proper physical address where to
1992           store the kernel image depending on your own flash memory usage.
1993
1994           Also note that the make target becomes "make xipImage" rather than
1995           "make zImage" or "make Image".  The final kernel binary to put in
1996           ROM memory will be arch/arm/boot/xipImage.
1997
1998           If unsure, say N.
1999
2000 config XIP_PHYS_ADDR
2001         hex "XIP Kernel Physical Location"
2002         depends on XIP_KERNEL
2003         default "0x00080000"
2004         help
2005           This is the physical address in your flash memory the kernel will
2006           be linked for and stored to.  This address is dependent on your
2007           own flash usage.
2008
2009 config KEXEC
2010         bool "Kexec system call (EXPERIMENTAL)"
2011         depends on (!SMP || PM_SLEEP_SMP)
2012         depends on !CPU_V7M
2013         select KEXEC_CORE
2014         help
2015           kexec is a system call that implements the ability to shutdown your
2016           current kernel, and to start another kernel.  It is like a reboot
2017           but it is independent of the system firmware.   And like a reboot
2018           you can start any kernel with it, not just Linux.
2019
2020           It is an ongoing process to be certain the hardware in a machine
2021           is properly shutdown, so do not be surprised if this code does not
2022           initially work for you.
2023
2024 config ATAGS_PROC
2025         bool "Export atags in procfs"
2026         depends on ATAGS && KEXEC
2027         default y
2028         help
2029           Should the atags used to boot the kernel be exported in an "atags"
2030           file in procfs. Useful with kexec.
2031
2032 config CRASH_DUMP
2033         bool "Build kdump crash kernel (EXPERIMENTAL)"
2034         help
2035           Generate crash dump after being started by kexec. This should
2036           be normally only set in special crash dump kernels which are
2037           loaded in the main kernel with kexec-tools into a specially
2038           reserved region and then later executed after a crash by
2039           kdump/kexec. The crash dump kernel must be compiled to a
2040           memory address not used by the main kernel
2041
2042           For more details see Documentation/kdump/kdump.txt
2043
2044 config AUTO_ZRELADDR
2045         bool "Auto calculation of the decompressed kernel image address"
2046         help
2047           ZRELADDR is the physical address where the decompressed kernel
2048           image will be placed. If AUTO_ZRELADDR is selected, the address
2049           will be determined at run-time by masking the current IP with
2050           0xf8000000. This assumes the zImage being placed in the first 128MB
2051           from start of memory.
2052
2053 config EFI_STUB
2054         bool
2055
2056 config EFI
2057         bool "UEFI runtime support"
2058         depends on OF && !CPU_BIG_ENDIAN && MMU && AUTO_ZRELADDR && !XIP_KERNEL
2059         select UCS2_STRING
2060         select EFI_PARAMS_FROM_FDT
2061         select EFI_STUB
2062         select EFI_ARMSTUB
2063         select EFI_RUNTIME_WRAPPERS
2064         ---help---
2065           This option provides support for runtime services provided
2066           by UEFI firmware (such as non-volatile variables, realtime
2067           clock, and platform reset). A UEFI stub is also provided to
2068           allow the kernel to be booted as an EFI application. This
2069           is only useful for kernels that may run on systems that have
2070           UEFI firmware.
2071
2072 config DMI
2073         bool "Enable support for SMBIOS (DMI) tables"
2074         depends on EFI
2075         default y
2076         help
2077           This enables SMBIOS/DMI feature for systems.
2078
2079           This option is only useful on systems that have UEFI firmware.
2080           However, even with this option, the resultant kernel should
2081           continue to boot on existing non-UEFI platforms.
2082
2083           NOTE: This does *NOT* enable or encourage the use of DMI quirks,
2084           i.e., the the practice of identifying the platform via DMI to
2085           decide whether certain workarounds for buggy hardware and/or
2086           firmware need to be enabled. This would require the DMI subsystem
2087           to be enabled much earlier than we do on ARM, which is non-trivial.
2088
2089 endmenu
2090
2091 menu "CPU Power Management"
2092
2093 source "drivers/cpufreq/Kconfig"
2094
2095 source "drivers/cpuidle/Kconfig"
2096
2097 endmenu
2098
2099 menu "Floating point emulation"
2100
2101 comment "At least one emulation must be selected"
2102
2103 config FPE_NWFPE
2104         bool "NWFPE math emulation"
2105         depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2106         ---help---
2107           Say Y to include the NWFPE floating point emulator in the kernel.
2108           This is necessary to run most binaries. Linux does not currently
2109           support floating point hardware so you need to say Y here even if
2110           your machine has an FPA or floating point co-processor podule.
2111
2112           You may say N here if you are going to load the Acorn FPEmulator
2113           early in the bootup.
2114
2115 config FPE_NWFPE_XP
2116         bool "Support extended precision"
2117         depends on FPE_NWFPE
2118         help
2119           Say Y to include 80-bit support in the kernel floating-point
2120           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
2121           Note that gcc does not generate 80-bit operations by default,
2122           so in most cases this option only enlarges the size of the
2123           floating point emulator without any good reason.
2124
2125           You almost surely want to say N here.
2126
2127 config FPE_FASTFPE
2128         bool "FastFPE math emulation (EXPERIMENTAL)"
2129         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2130         ---help---
2131           Say Y here to include the FAST floating point emulator in the kernel.
2132           This is an experimental much faster emulator which now also has full
2133           precision for the mantissa.  It does not support any exceptions.
2134           It is very simple, and approximately 3-6 times faster than NWFPE.
2135
2136           It should be sufficient for most programs.  It may be not suitable
2137           for scientific calculations, but you have to check this for yourself.
2138           If you do not feel you need a faster FP emulation you should better
2139           choose NWFPE.
2140
2141 config VFP
2142         bool "VFP-format floating point maths"
2143         depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2144         help
2145           Say Y to include VFP support code in the kernel. This is needed
2146           if your hardware includes a VFP unit.
2147
2148           Please see <file:Documentation/arm/VFP/release-notes.txt> for
2149           release notes and additional status information.
2150
2151           Say N if your target does not have VFP hardware.
2152
2153 config VFPv3
2154         bool
2155         depends on VFP
2156         default y if CPU_V7
2157
2158 config NEON
2159         bool "Advanced SIMD (NEON) Extension support"
2160         depends on VFPv3 && CPU_V7
2161         help
2162           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2163           Extension.
2164
2165 config KERNEL_MODE_NEON
2166         bool "Support for NEON in kernel mode"
2167         depends on NEON && AEABI
2168         help
2169           Say Y to include support for NEON in kernel mode.
2170
2171 endmenu
2172
2173 menu "Userspace binary formats"
2174
2175 source "fs/Kconfig.binfmt"
2176
2177 endmenu
2178
2179 menu "Power management options"
2180
2181 source "kernel/power/Kconfig"
2182
2183 config ARCH_SUSPEND_POSSIBLE
2184         depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2185                 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2186         def_bool y
2187
2188 config ARM_CPU_SUSPEND
2189         def_bool PM_SLEEP || BL_SWITCHER || ARM_PSCI_FW
2190         depends on ARCH_SUSPEND_POSSIBLE
2191
2192 config ARCH_HIBERNATION_POSSIBLE
2193         bool
2194         depends on MMU
2195         default y if ARCH_SUSPEND_POSSIBLE
2196
2197 endmenu
2198
2199 source "net/Kconfig"
2200
2201 source "drivers/Kconfig"
2202
2203 source "drivers/firmware/Kconfig"
2204
2205 source "fs/Kconfig"
2206
2207 source "arch/arm/Kconfig.debug"
2208
2209 source "security/Kconfig"
2210
2211 source "crypto/Kconfig"
2212 if CRYPTO
2213 source "arch/arm/crypto/Kconfig"
2214 endif
2215
2216 source "lib/Kconfig"
2217
2218 source "arch/arm/kvm/Kconfig"