arch/arm/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 mainmenu "Linux Kernel Configuration"
   7
   8 config ARM
   9         bool
  10         default y
  11         select RTC_LIB
  12         select SYS_SUPPORTS_APM_EMULATION
  13         help
  14           The ARM series is a line of low-power-consumption RISC chip designs
  15           licensed by ARM Ltd and targeted at embedded applications and
  16           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  17           manufactured, but legacy ARM-based PC hardware remains popular in
  18           Europe.  There is an ARM Linux project with a web page at
  19           <http://www.arm.linux.org.uk/>.
  20
  21 config SYS_SUPPORTS_APM_EMULATION
  22         bool
  23
  24 config GENERIC_GPIO
  25         bool
  26         default n
  27
  28 config GENERIC_TIME
  29         bool
  30         default n
  31
  32 config GENERIC_CLOCKEVENTS
  33         bool
  34         default n
  35
  36 config MMU
  37         bool
  38         default y
  39
  40 config NO_IOPORT
  41         bool
  42         default n
  43
  44 config EISA
  45         bool
  46         ---help---
  47           The Extended Industry Standard Architecture (EISA) bus was
  48           developed as an open alternative to the IBM MicroChannel bus.
  49
  50           The EISA bus provided some of the features of the IBM MicroChannel
  51           bus while maintaining backward compatibility with cards made for
  52           the older ISA bus.  The EISA bus saw limited use between 1988 and
  53           1995 when it was made obsolete by the PCI bus.
  54
  55           Say Y here if you are building a kernel for an EISA-based machine.
  56
  57           Otherwise, say N.
  58
  59 config SBUS
  60         bool
  61
  62 config MCA
  63         bool
  64         help
  65           MicroChannel Architecture is found in some IBM PS/2 machines and
  66           laptops.  It is a bus system similar to PCI or ISA. See
  67           <file:Documentation/mca.txt> (and especially the web page given
  68           there) before attempting to build an MCA bus kernel.
  69
  70 config GENERIC_HARDIRQS
  71         bool
  72         default y
  73
  74 config STACKTRACE_SUPPORT
  75         bool
  76         default y
  77
  78 config LOCKDEP_SUPPORT
  79         bool
  80         default y
  81
  82 config TRACE_IRQFLAGS_SUPPORT
  83         bool
  84         default y
  85
  86 config HARDIRQS_SW_RESEND
  87         bool
  88         default y
  89
  90 config GENERIC_IRQ_PROBE
  91         bool
  92         default y
  93
  94 config GENERIC_LOCKBREAK
  95         bool
  96         default y
  97         depends on SMP && PREEMPT
  98
  99 config RWSEM_GENERIC_SPINLOCK
 100         bool
 101         default y
 102
 103 config RWSEM_XCHGADD_ALGORITHM
 104         bool
 105
 106 config ARCH_HAS_ILOG2_U32
 107         bool
 108         default n
 109
 110 config ARCH_HAS_ILOG2_U64
 111         bool
 112         default n
 113
 114 config GENERIC_HWEIGHT
 115         bool
 116         default y
 117
 118 config GENERIC_CALIBRATE_DELAY
 119         bool
 120         default y
 121
 122 config ARCH_MAY_HAVE_PC_FDC
 123         bool
 124
 125 config ZONE_DMA
 126         bool
 127         default y
 128
 129 config GENERIC_ISA_DMA
 130         bool
 131
 132 config FIQ
 133         bool
 134
 135 config ARCH_MTD_XIP
 136         bool
 137
 138 config VECTORS_BASE
 139         hex
 140         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 141         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 142         default 0x00000000
 143         help
 144           The base address of exception vectors.
 145
 146 source "init/Kconfig"
 147
 148 menu "System Type"
 149
 150 choice
 151         prompt "ARM system type"
 152         default ARCH_VERSATILE
 153
 154 config ARCH_AAEC2000
 155         bool "Agilent AAEC-2000 based"
 156         select ARM_AMBA
 157         help
 158           This enables support for systems based on the Agilent AAEC-2000
 159
 160 config ARCH_INTEGRATOR
 161         bool "ARM Ltd. Integrator family"
 162         select ARM_AMBA
 163         select ICST525
 164         help
 165           Support for ARM's Integrator platform.
 166
 167 config ARCH_REALVIEW
 168         bool "ARM Ltd. RealView family"
 169         select ARM_AMBA
 170         select ICST307
 171         help
 172           This enables support for ARM Ltd RealView boards.
 173
 174 config ARCH_VERSATILE
 175         bool "ARM Ltd. Versatile family"
 176         select ARM_AMBA
 177         select ARM_VIC
 178         select ICST307
 179         select GENERIC_TIME
 180         select GENERIC_CLOCKEVENTS
 181         help
 182           This enables support for ARM Ltd Versatile board.
 183
 184 config ARCH_AT91
 185         bool "Atmel AT91"
 186         select GENERIC_GPIO
 187         help
 188           This enables support for systems based on the Atmel AT91RM9200,
 189           AT91SAM9 and AT91CAP9 processors.
 190
 191 config ARCH_CLPS7500
 192         bool "Cirrus CL-PS7500FE"
 193         select TIMER_ACORN
 194         select ISA
 195         select NO_IOPORT
 196         help
 197           Support for the Cirrus Logic PS7500FE system-on-a-chip.
 198
 199 config ARCH_CLPS711X
 200         bool "Cirrus Logic CLPS711x/EP721x-based"
 201         help
 202           Support for Cirrus Logic 711x/721x based boards.
 203
 204 config ARCH_CO285
 205         bool "Co-EBSA285"
 206         select FOOTBRIDGE
 207         select FOOTBRIDGE_ADDIN
 208         help
 209           Support for Intel's EBSA285 companion chip.
 210
 211 config ARCH_EBSA110
 212         bool "EBSA-110"
 213         select ISA
 214         select NO_IOPORT
 215         help
 216           This is an evaluation board for the StrongARM processor available
 217           from Digital. It has limited hardware on-board, including an
 218           Ethernet interface, two PCMCIA sockets, two serial ports and a
 219           parallel port.
 220
 221 config ARCH_EP93XX
 222         bool "EP93xx-based"
 223         select ARM_AMBA
 224         select ARM_VIC
 225         select GENERIC_GPIO
 226         help
 227           This enables support for the Cirrus EP93xx series of CPUs.
 228
 229 config ARCH_FOOTBRIDGE
 230         bool "FootBridge"
 231         select FOOTBRIDGE
 232         help
 233           Support for systems based on the DC21285 companion chip
 234           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 235
 236 config ARCH_NETX
 237         bool "Hilscher NetX based"
 238         select ARM_VIC
 239         help
 240           This enables support for systems based on the Hilscher NetX Soc
 241
 242 config ARCH_H720X
 243         bool "Hynix HMS720x-based"
 244         select ISA_DMA_API
 245         help
 246           This enables support for systems based on the Hynix HMS720x
 247
 248 config ARCH_IMX
 249         bool "IMX"
 250         select GENERIC_GPIO
 251         select GENERIC_TIME
 252         select GENERIC_CLOCKEVENTS
 253         help
 254           Support for Motorola's i.MX family of processors (MX1, MXL).
 255
 256 config ARCH_IOP13XX
 257         bool "IOP13xx-based"
 258         depends on MMU
 259         select PLAT_IOP
 260         select PCI
 261         select ARCH_SUPPORTS_MSI
 262         help
 263           Support for Intel's IOP13XX (XScale) family of processors.
 264
 265 config ARCH_IOP32X
 266         bool "IOP32x-based"
 267         depends on MMU
 268         select PLAT_IOP
 269         select PCI
 270         help
 271           Support for Intel's 80219 and IOP32X (XScale) family of
 272           processors.
 273
 274 config ARCH_IOP33X
 275         bool "IOP33x-based"
 276         depends on MMU
 277         select PLAT_IOP
 278         select PCI
 279         help
 280           Support for Intel's IOP33X (XScale) family of processors.
 281
 282 config ARCH_IXP23XX
 283         bool "IXP23XX-based"
 284         depends on MMU
 285         select PCI
 286         help
 287           Support for Intel's IXP23xx (XScale) family of processors.
 288
 289 config ARCH_IXP2000
 290         bool "IXP2400/2800-based"
 291         depends on MMU
 292         select PCI
 293         help
 294           Support for Intel's IXP2400/2800 (XScale) family of processors.
 295
 296 config ARCH_IXP4XX
 297         bool "IXP4xx-based"
 298         depends on MMU
 299         select GENERIC_GPIO
 300         select GENERIC_TIME
 301         select GENERIC_CLOCKEVENTS
 302         help
 303           Support for Intel's IXP4XX (XScale) family of processors.
 304
 305 config ARCH_L7200
 306         bool "LinkUp-L7200"
 307         select FIQ
 308         help
 309           Say Y here if you intend to run this kernel on a LinkUp Systems
 310           L7200 Software Development Board which uses an ARM720T processor.
 311           Information on this board can be obtained at:
 312
 313           <http://www.linkupsys.com/>
 314
 315           If you have any questions or comments about the Linux kernel port
 316           to this board, send e-mail to <sjhill@cotw.com>.
 317
 318 config ARCH_KS8695
 319         bool "Micrel/Kendin KS8695"
 320         select GENERIC_GPIO
 321         help
 322           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 323           System-on-Chip devices.
 324
 325 config ARCH_NS9XXX
 326         bool "NetSilicon NS9xxx"
 327         select GENERIC_GPIO
 328         select GENERIC_TIME
 329         select GENERIC_CLOCKEVENTS
 330         help
 331           Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
 332           System.
 333
 334           <http://www.digi.com/products/microprocessors/index.jsp>
 335
 336 config ARCH_MXC
 337         bool "Freescale MXC/iMX-based"
 338         select ARCH_MTD_XIP
 339         help
 340           Support for Freescale MXC/iMX-based family of processors
 341
 342 config ARCH_ORION
 343         bool "Marvell Orion"
 344         depends on MMU
 345         select PCI
 346         select GENERIC_GPIO
 347         select GENERIC_TIME
 348         select GENERIC_CLOCKEVENTS
 349         help
 350           Support for Marvell Orion System on Chip family.
 351
 352 config ARCH_PNX4008
 353         bool "Philips Nexperia PNX4008 Mobile"
 354         help
 355           This enables support for Philips PNX4008 mobile platform.
 356
 357 config ARCH_PXA
 358         bool "PXA2xx/PXA3xx-based"
 359         depends on MMU
 360         select ARCH_MTD_XIP
 361         select GENERIC_GPIO
 362         select GENERIC_TIME
 363         select GENERIC_CLOCKEVENTS
 364         select TICK_ONESHOT
 365         help
 366           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 367
 368 config ARCH_RPC
 369         bool "RiscPC"
 370         select ARCH_ACORN
 371         select FIQ
 372         select TIMER_ACORN
 373         select ARCH_MAY_HAVE_PC_FDC
 374         select ISA_DMA_API
 375         select NO_IOPORT
 376         help
 377           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 378           CD-ROM interface, serial and parallel port, and the floppy drive.
 379
 380 config ARCH_SA1100
 381         bool "SA1100-based"
 382         select ISA
 383         select ARCH_DISCONTIGMEM_ENABLE
 384         select ARCH_MTD_XIP
 385         select GENERIC_GPIO
 386         select GENERIC_TIME
 387         help
 388           Support for StrongARM 11x0 based boards.
 389
 390 config ARCH_S3C2410
 391         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
 392         select GENERIC_GPIO
 393         help
 394           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 395           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 396           the Samsung SMDK2410 development board (and derivatives).
 397
 398 config ARCH_SHARK
 399         bool "Shark"
 400         select ISA
 401         select ISA_DMA
 402         select PCI
 403         help
 404           Support for the StrongARM based Digital DNARD machine, also known
 405           as "Shark" (<http://www.shark-linux.de/shark.html>).
 406
 407 config ARCH_LH7A40X
 408         bool "Sharp LH7A40X"
 409         help
 410           Say Y here for systems based on one of the Sharp LH7A40X
 411           System on a Chip processors.  These CPUs include an ARM922T
 412           core with a wide array of integrated devices for
 413           hand-held and low-power applications.
 414
 415 config ARCH_DAVINCI
 416         bool "TI DaVinci"
 417         select GENERIC_TIME
 418         select GENERIC_CLOCKEVENTS
 419         select GENERIC_GPIO
 420         help
 421           Support for TI's DaVinci platform.
 422
 423 config ARCH_OMAP
 424         bool "TI OMAP"
 425         select GENERIC_GPIO
 426         select GENERIC_TIME
 427         help
 428           Support for TI's OMAP platform (OMAP1 and OMAP2).
 429
 430 config ARCH_MSM7X00A
 431         bool "Qualcomm MSM7X00A"
 432         select GENERIC_TIME
 433         select GENERIC_CLOCKEVENTS
 434         help
 435           Support for Qualcomm MSM7X00A based systems.  This runs on the ARM11
 436           apps processor of the MSM7X00A and depends on a shared memory
 437           interface to the ARM9 modem processor which runs the baseband stack
 438           and controls some vital subsystems (clock and power control, etc).
 439           <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
 440
 441 endchoice
 442
 443 source "arch/arm/mach-clps711x/Kconfig"
 444
 445 source "arch/arm/mach-ep93xx/Kconfig"
 446
 447 source "arch/arm/mach-footbridge/Kconfig"
 448
 449 source "arch/arm/mach-integrator/Kconfig"
 450
 451 source "arch/arm/mach-iop32x/Kconfig"
 452
 453 source "arch/arm/mach-iop33x/Kconfig"
 454
 455 source "arch/arm/mach-iop13xx/Kconfig"
 456
 457 source "arch/arm/mach-ixp4xx/Kconfig"
 458
 459 source "arch/arm/mach-ixp2000/Kconfig"
 460
 461 source "arch/arm/mach-ixp23xx/Kconfig"
 462
 463 source "arch/arm/mach-pxa/Kconfig"
 464
 465 source "arch/arm/mach-sa1100/Kconfig"
 466
 467 source "arch/arm/plat-omap/Kconfig"
 468
 469 source "arch/arm/mach-omap1/Kconfig"
 470
 471 source "arch/arm/mach-omap2/Kconfig"
 472
 473 source "arch/arm/mach-orion/Kconfig"
 474
 475 source "arch/arm/plat-s3c24xx/Kconfig"
 476 source "arch/arm/plat-s3c/Kconfig"
 477
 478 if ARCH_S3C2410
 479 source "arch/arm/mach-s3c2400/Kconfig"
 480 source "arch/arm/mach-s3c2410/Kconfig"
 481 source "arch/arm/mach-s3c2412/Kconfig"
 482 source "arch/arm/mach-s3c2440/Kconfig"
 483 source "arch/arm/mach-s3c2442/Kconfig"
 484 source "arch/arm/mach-s3c2443/Kconfig"
 485 endif
 486
 487 source "arch/arm/mach-lh7a40x/Kconfig"
 488
 489 source "arch/arm/mach-imx/Kconfig"
 490
 491 source "arch/arm/mach-h720x/Kconfig"
 492
 493 source "arch/arm/mach-versatile/Kconfig"
 494
 495 source "arch/arm/mach-aaec2000/Kconfig"
 496
 497 source "arch/arm/mach-realview/Kconfig"
 498
 499 source "arch/arm/mach-at91/Kconfig"
 500
 501 source "arch/arm/plat-mxc/Kconfig"
 502
 503 source "arch/arm/mach-netx/Kconfig"
 504
 505 source "arch/arm/mach-ns9xxx/Kconfig"
 506
 507 source "arch/arm/mach-davinci/Kconfig"
 508
 509 source "arch/arm/mach-ks8695/Kconfig"
 510
 511 source "arch/arm/mach-msm/Kconfig"
 512
 513 # Definitions to make life easier
 514 config ARCH_ACORN
 515         bool
 516
 517 config PLAT_IOP
 518         bool
 519
 520 source arch/arm/mm/Kconfig
 521
 522 config IWMMXT
 523         bool "Enable iWMMXt support"
 524         depends on CPU_XSCALE || CPU_XSC3
 525         default y if PXA27x || PXA3xx
 526         help
 527           Enable support for iWMMXt context switching at run time if
 528           running on a CPU that supports it.
 529
 530 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 531 config XSCALE_PMU
 532         bool
 533         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 534         default y
 535
 536 if !MMU
 537 source "arch/arm/Kconfig-nommu"
 538 endif
 539
 540 endmenu
 541
 542 source "arch/arm/common/Kconfig"
 543
 544 config FORCE_MAX_ZONEORDER
 545         int
 546         depends on SA1111
 547         default "9"
 548
 549 menu "Bus support"
 550
 551 config ARM_AMBA
 552         bool
 553
 554 config ISA
 555         bool
 556         help
 557           Find out whether you have ISA slots on your motherboard.  ISA is the
 558           name of a bus system, i.e. the way the CPU talks to the other stuff
 559           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 560           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 561           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 562
 563 # Select ISA DMA controller support
 564 config ISA_DMA
 565         bool
 566         select ISA_DMA_API
 567
 568 # Select ISA DMA interface
 569 config ISA_DMA_API
 570         bool
 571
 572 config PCI
 573         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
 574         help
 575           Find out whether you have a PCI motherboard. PCI is the name of a
 576           bus system, i.e. the way the CPU talks to the other stuff inside
 577           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 578           VESA. If you have PCI, say Y, otherwise N.
 579
 580 config PCI_SYSCALL
 581         def_bool PCI
 582
 583 # Select the host bridge type
 584 config PCI_HOST_VIA82C505
 585         bool
 586         depends on PCI && ARCH_SHARK
 587         default y
 588
 589 config PCI_HOST_ITE8152
 590         bool
 591         depends on PCI && MACH_ARMCORE
 592         default y
 593         select DMABOUNCE
 594
 595 source "drivers/pci/Kconfig"
 596
 597 source "drivers/pcmcia/Kconfig"
 598
 599 endmenu
 600
 601 menu "Kernel Features"
 602
 603 source "kernel/time/Kconfig"
 604
 605 config SMP
 606         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 607         depends on EXPERIMENTAL && REALVIEW_MPCORE
 608         help
 609           This enables support for systems with more than one CPU. If you have
 610           a system with only one CPU, like most personal computers, say N. If
 611           you have a system with more than one CPU, say Y.
 612
 613           If you say N here, the kernel will run on single and multiprocessor
 614           machines, but will use only one CPU of a multiprocessor machine. If
 615           you say Y here, the kernel will run on many, but not all, single
 616           processor machines. On a single processor machine, the kernel will
 617           run faster if you say N here.
 618
 619           See also <file:Documentation/i386/IO-APIC.txt>,
 620           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 621           <http://www.linuxdoc.org/docs.html#howto>.
 622
 623           If you don't know what to do here, say N.
 624
 625 config NR_CPUS
 626         int "Maximum number of CPUs (2-32)"
 627         range 2 32
 628         depends on SMP
 629         default "4"
 630
 631 config HOTPLUG_CPU
 632         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 633         depends on SMP && HOTPLUG && EXPERIMENTAL
 634         help
 635           Say Y here to experiment with turning CPUs off and on.  CPUs
 636           can be controlled through /sys/devices/system/cpu.
 637
 638 config LOCAL_TIMERS
 639         bool "Use local timer interrupts"
 640         depends on SMP && REALVIEW_MPCORE
 641         default y
 642         help
 643           Enable support for local timers on SMP platforms, rather then the
 644           legacy IPI broadcast method.  Local timers allows the system
 645           accounting to be spread across the timer interval, preventing a
 646           "thundering herd" at every timer tick.
 647
 648 config PREEMPT
 649         bool "Preemptible Kernel (EXPERIMENTAL)"
 650         depends on EXPERIMENTAL
 651         help
 652           This option reduces the latency of the kernel when reacting to
 653           real-time or interactive events by allowing a low priority process to
 654           be preempted even if it is in kernel mode executing a system call.
 655           This allows applications to run more reliably even when the system is
 656           under load.
 657
 658           Say Y here if you are building a kernel for a desktop, embedded
 659           or real-time system.  Say N if you are unsure.
 660
 661 config NO_IDLE_HZ
 662         bool "Dynamic tick timer"
 663         depends on !GENERIC_CLOCKEVENTS
 664         help
 665           Select this option if you want to disable continuous timer ticks
 666           and have them programmed to occur as required. This option saves
 667           power as the system can remain in idle state for longer.
 668
 669           By default dynamic tick is disabled during the boot, and can be
 670           manually enabled with:
 671
 672             echo 1 > /sys/devices/system/timer/timer0/dyn_tick
 673
 674           Alternatively, if you want dynamic tick automatically enabled
 675           during boot, pass "dyntick=enable" via the kernel command string.
 676
 677           Please note that dynamic tick may affect the accuracy of
 678           timekeeping on some platforms depending on the implementation.
 679           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
 680           to have accurate timekeeping with dynamic tick.
 681
 682 config HZ
 683         int
 684         default 128 if ARCH_L7200
 685         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 686         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 687         default AT91_TIMER_HZ if ARCH_AT91
 688         default 100
 689
 690 config AEABI
 691         bool "Use the ARM EABI to compile the kernel"
 692         help
 693           This option allows for the kernel to be compiled using the latest
 694           ARM ABI (aka EABI).  This is only useful if you are using a user
 695           space environment that is also compiled with EABI.
 696
 697           Since there are major incompatibilities between the legacy ABI and
 698           EABI, especially with regard to structure member alignment, this
 699           option also changes the kernel syscall calling convention to
 700           disambiguate both ABIs and allow for backward compatibility support
 701           (selected with CONFIG_OABI_COMPAT).
 702
 703           To use this you need GCC version 4.0.0 or later.
 704
 705 config OABI_COMPAT
 706         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 707         depends on AEABI && EXPERIMENTAL
 708         default y
 709         help
 710           This option preserves the old syscall interface along with the
 711           new (ARM EABI) one. It also provides a compatibility layer to
 712           intercept syscalls that have structure arguments which layout
 713           in memory differs between the legacy ABI and the new ARM EABI
 714           (only for non "thumb" binaries). This option adds a tiny
 715           overhead to all syscalls and produces a slightly larger kernel.
 716           If you know you'll be using only pure EABI user space then you
 717           can say N here. If this option is not selected and you attempt
 718           to execute a legacy ABI binary then the result will be
 719           UNPREDICTABLE (in fact it can be predicted that it won't work
 720           at all). If in doubt say Y.
 721
 722 config ARCH_DISCONTIGMEM_ENABLE
 723         bool
 724         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 725         help
 726           Say Y to support efficient handling of discontiguous physical memory,
 727           for architectures which are either NUMA (Non-Uniform Memory Access)
 728           or have huge holes in the physical address space for other reasons.
 729           See <file:Documentation/vm/numa> for more.
 730
 731 config NODES_SHIFT
 732         int
 733         default "4" if ARCH_LH7A40X
 734         default "2"
 735         depends on NEED_MULTIPLE_NODES
 736
 737 source "mm/Kconfig"
 738
 739 config LEDS
 740         bool "Timer and CPU usage LEDs"
 741         depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
 742                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 743                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 744                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 745                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 746                    ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
 747                    ARCH_KS8695 || MACH_RD88F5182
 748         help
 749           If you say Y here, the LEDs on your machine will be used
 750           to provide useful information about your current system status.
 751
 752           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 753           be able to select which LEDs are active using the options below. If
 754           you are compiling a kernel for the EBSA-110 or the LART however, the
 755           red LED will simply flash regularly to indicate that the system is
 756           still functional. It is safe to say Y here if you have a CATS
 757           system, but the driver will do nothing.
 758
 759 config LEDS_TIMER
 760         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 761                             OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 762                             || MACH_OMAP_PERSEUS2
 763         depends on LEDS
 764         depends on !GENERIC_CLOCKEVENTS
 765         default y if ARCH_EBSA110
 766         help
 767           If you say Y here, one of the system LEDs (the green one on the
 768           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 769           will flash regularly to indicate that the system is still
 770           operational. This is mainly useful to kernel hackers who are
 771           debugging unstable kernels.
 772
 773           The LART uses the same LED for both Timer LED and CPU usage LED
 774           functions. You may choose to use both, but the Timer LED function
 775           will overrule the CPU usage LED.
 776
 777 config LEDS_CPU
 778         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 779                         !ARCH_OMAP) \
 780                         || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 781                         || MACH_OMAP_PERSEUS2
 782         depends on LEDS
 783         help
 784           If you say Y here, the red LED will be used to give a good real
 785           time indication of CPU usage, by lighting whenever the idle task
 786           is not currently executing.
 787
 788           The LART uses the same LED for both Timer LED and CPU usage LED
 789           functions. You may choose to use both, but the Timer LED function
 790           will overrule the CPU usage LED.
 791
 792 config ALIGNMENT_TRAP
 793         bool
 794         depends on CPU_CP15_MMU
 795         default y if !ARCH_EBSA110
 796         help
 797           ARM processors cannot fetch/store information which is not
 798           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 799           address divisible by 4. On 32-bit ARM processors, these non-aligned
 800           fetch/store instructions will be emulated in software if you say
 801           here, which has a severe performance impact. This is necessary for
 802           correct operation of some network protocols. With an IP-only
 803           configuration it is safe to say N, otherwise say Y.
 804
 805 endmenu
 806
 807 menu "Boot options"
 808
 809 # Compressed boot loader in ROM.  Yes, we really want to ask about
 810 # TEXT and BSS so we preserve their values in the config files.
 811 config ZBOOT_ROM_TEXT
 812         hex "Compressed ROM boot loader base address"
 813         default "0"
 814         help
 815           The physical address at which the ROM-able zImage is to be
 816           placed in the target.  Platforms which normally make use of
 817           ROM-able zImage formats normally set this to a suitable
 818           value in their defconfig file.
 819
 820           If ZBOOT_ROM is not enabled, this has no effect.
 821
 822 config ZBOOT_ROM_BSS
 823         hex "Compressed ROM boot loader BSS address"
 824         default "0"
 825         help
 826           The base address of an area of read/write memory in the target
 827           for the ROM-able zImage which must be available while the
 828           decompressor is running. It must be large enough to hold the
 829           entire decompressed kernel plus an additional 128 KiB.
 830           Platforms which normally make use of ROM-able zImage formats
 831           normally set this to a suitable value in their defconfig file.
 832
 833           If ZBOOT_ROM is not enabled, this has no effect.
 834
 835 config ZBOOT_ROM
 836         bool "Compressed boot loader in ROM/flash"
 837         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 838         help
 839           Say Y here if you intend to execute your compressed kernel image
 840           (zImage) directly from ROM or flash.  If unsure, say N.
 841
 842 config CMDLINE
 843         string "Default kernel command string"
 844         default ""
 845         help
 846           On some architectures (EBSA110 and CATS), there is currently no way
 847           for the boot loader to pass arguments to the kernel. For these
 848           architectures, you should supply some command-line options at build
 849           time by entering them here. As a minimum, you should specify the
 850           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 851
 852 config XIP_KERNEL
 853         bool "Kernel Execute-In-Place from ROM"
 854         depends on !ZBOOT_ROM
 855         help
 856           Execute-In-Place allows the kernel to run from non-volatile storage
 857           directly addressable by the CPU, such as NOR flash. This saves RAM
 858           space since the text section of the kernel is not loaded from flash
 859           to RAM.  Read-write sections, such as the data section and stack,
 860           are still copied to RAM.  The XIP kernel is not compressed since
 861           it has to run directly from flash, so it will take more space to
 862           store it.  The flash address used to link the kernel object files,
 863           and for storing it, is configuration dependent. Therefore, if you
 864           say Y here, you must know the proper physical address where to
 865           store the kernel image depending on your own flash memory usage.
 866
 867           Also note that the make target becomes "make xipImage" rather than
 868           "make zImage" or "make Image".  The final kernel binary to put in
 869           ROM memory will be arch/arm/boot/xipImage.
 870
 871           If unsure, say N.
 872
 873 config XIP_PHYS_ADDR
 874         hex "XIP Kernel Physical Location"
 875         depends on XIP_KERNEL
 876         default "0x00080000"
 877         help
 878           This is the physical address in your flash memory the kernel will
 879           be linked for and stored to.  This address is dependent on your
 880           own flash usage.
 881
 882 config KEXEC
 883         bool "Kexec system call (EXPERIMENTAL)"
 884         depends on EXPERIMENTAL
 885         help
 886           kexec is a system call that implements the ability to shutdown your
 887           current kernel, and to start another kernel.  It is like a reboot
 888           but it is independent of the system firmware.   And like a reboot
 889           you can start any kernel with it, not just Linux.
 890
 891           It is an ongoing process to be certain the hardware in a machine
 892           is properly shutdown, so do not be surprised if this code does not
 893           initially work for you.  It may help to enable device hotplugging
 894           support.
 895
 896 endmenu
 897
 898 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
 899
 900 menu "CPU Frequency scaling"
 901
 902 source "drivers/cpufreq/Kconfig"
 903
 904 config CPU_FREQ_SA1100
 905         bool
 906         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 907         default y
 908
 909 config CPU_FREQ_SA1110
 910         bool
 911         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 912         default y
 913
 914 config CPU_FREQ_INTEGRATOR
 915         tristate "CPUfreq driver for ARM Integrator CPUs"
 916         depends on ARCH_INTEGRATOR && CPU_FREQ
 917         default y
 918         help
 919           This enables the CPUfreq driver for ARM Integrator CPUs.
 920
 921           For details, take a look at <file:Documentation/cpu-freq>.
 922
 923           If in doubt, say Y.
 924
 925 config CPU_FREQ_IMX
 926         tristate "CPUfreq driver for i.MX CPUs"
 927         depends on ARCH_IMX && CPU_FREQ
 928         default n
 929         help
 930           This enables the CPUfreq driver for i.MX CPUs.
 931
 932           If in doubt, say N.
 933
 934 config CPU_FREQ_PXA
 935         bool
 936         depends on CPU_FREQ && ARCH_PXA && PXA25x
 937         default y
 938         select CPU_FREQ_DEFAULT_GOV_USERSPACE
 939
 940 endmenu
 941
 942 endif
 943
 944 menu "Floating point emulation"
 945
 946 comment "At least one emulation must be selected"
 947
 948 config FPE_NWFPE
 949         bool "NWFPE math emulation"
 950         depends on !AEABI || OABI_COMPAT
 951         ---help---
 952           Say Y to include the NWFPE floating point emulator in the kernel.
 953           This is necessary to run most binaries. Linux does not currently
 954           support floating point hardware so you need to say Y here even if
 955           your machine has an FPA or floating point co-processor podule.
 956
 957           You may say N here if you are going to load the Acorn FPEmulator
 958           early in the bootup.
 959
 960 config FPE_NWFPE_XP
 961         bool "Support extended precision"
 962         depends on FPE_NWFPE
 963         help
 964           Say Y to include 80-bit support in the kernel floating-point
 965           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
 966           Note that gcc does not generate 80-bit operations by default,
 967           so in most cases this option only enlarges the size of the
 968           floating point emulator without any good reason.
 969
 970           You almost surely want to say N here.
 971
 972 config FPE_FASTFPE
 973         bool "FastFPE math emulation (EXPERIMENTAL)"
 974         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
 975         ---help---
 976           Say Y here to include the FAST floating point emulator in the kernel.
 977           This is an experimental much faster emulator which now also has full
 978           precision for the mantissa.  It does not support any exceptions.
 979           It is very simple, and approximately 3-6 times faster than NWFPE.
 980
 981           It should be sufficient for most programs.  It may be not suitable
 982           for scientific calculations, but you have to check this for yourself.
 983           If you do not feel you need a faster FP emulation you should better
 984           choose NWFPE.
 985
 986 config VFP
 987         bool "VFP-format floating point maths"
 988         depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
 989         help
 990           Say Y to include VFP support code in the kernel. This is needed
 991           if your hardware includes a VFP unit.
 992
 993           Please see <file:Documentation/arm/VFP/release-notes.txt> for
 994           release notes and additional status information.
 995
 996           Say N if your target does not have VFP hardware.
 997
 998 config VFPv3
 999         bool
1000         depends on VFP
1001         default y if CPU_V7
1002
1003 config NEON
1004         bool "Advanced SIMD (NEON) Extension support"
1005         depends on VFPv3 && CPU_V7
1006         help
1007           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1008           Extension.
1009
1010 endmenu
1011
1012 menu "Userspace binary formats"
1013
1014 source "fs/Kconfig.binfmt"
1015
1016 config ARTHUR
1017         tristate "RISC OS personality"
1018         depends on !AEABI
1019         help
1020           Say Y here to include the kernel code necessary if you want to run
1021           Acorn RISC OS/Arthur binaries under Linux. This code is still very
1022           experimental; if this sounds frightening, say N and sleep in peace.
1023           You can also say M here to compile this support as a module (which
1024           will be called arthur).
1025
1026 endmenu
1027
1028 menu "Power management options"
1029
1030 source "kernel/power/Kconfig"
1031
1032 config ARCH_SUSPEND_POSSIBLE
1033         def_bool y
1034
1035 endmenu
1036
1037 source "net/Kconfig"
1038
1039 menu "Device Drivers"
1040
1041 source "drivers/base/Kconfig"
1042
1043 source "drivers/connector/Kconfig"
1044
1045 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1046 source "drivers/mtd/Kconfig"
1047 endif
1048
1049 source "drivers/parport/Kconfig"
1050
1051 source "drivers/pnp/Kconfig"
1052
1053 source "drivers/block/Kconfig"
1054
1055 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1056
1057 source "drivers/misc/Kconfig"
1058
1059 if PCMCIA || ARCH_CLPS7500 || ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX \
1060         || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
1061         || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
1062         || ARCH_IXP23XX
1063 source "drivers/ide/Kconfig"
1064 endif
1065
1066 source "drivers/scsi/Kconfig"
1067
1068 source "drivers/ata/Kconfig"
1069
1070 source "drivers/md/Kconfig"
1071
1072 source "drivers/message/fusion/Kconfig"
1073
1074 source "drivers/ieee1394/Kconfig"
1075
1076 source "drivers/message/i2o/Kconfig"
1077
1078 source "drivers/net/Kconfig"
1079
1080 source "drivers/isdn/Kconfig"
1081
1082 # input before char - char/joystick depends on it. As does USB.
1083
1084 source "drivers/input/Kconfig"
1085
1086 source "drivers/char/Kconfig"
1087
1088 source "drivers/i2c/Kconfig"
1089
1090 source "drivers/spi/Kconfig"
1091
1092 source "drivers/w1/Kconfig"
1093
1094 source "drivers/power/Kconfig"
1095
1096 source "drivers/hwmon/Kconfig"
1097
1098 source "drivers/watchdog/Kconfig"
1099
1100 source "drivers/ssb/Kconfig"
1101
1102 #source "drivers/l3/Kconfig"
1103
1104 source "drivers/mfd/Kconfig"
1105
1106 source "drivers/media/Kconfig"
1107
1108 source "drivers/video/Kconfig"
1109
1110 source "sound/Kconfig"
1111
1112 source "drivers/hid/Kconfig"
1113
1114 source "drivers/usb/Kconfig"
1115
1116 source "drivers/mmc/Kconfig"
1117
1118 source "drivers/leds/Kconfig"
1119
1120 source "drivers/rtc/Kconfig"
1121
1122 source "drivers/dma/Kconfig"
1123
1124 source "drivers/dca/Kconfig"
1125
1126 endmenu
1127
1128 source "fs/Kconfig"
1129
1130 source "arch/arm/Kconfig.instrumentation"
1131
1132 source "arch/arm/Kconfig.debug"
1133
1134 source "security/Kconfig"
1135
1136 source "crypto/Kconfig"
1137
1138 source "lib/Kconfig"