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         select HAVE_OPROFILE
  14         select HAVE_KPROBES if (!XIP_KERNEL)
  15         select HAVE_KRETPROBES if (HAVE_KPROBES)
  16         help
  17           The ARM series is a line of low-power-consumption RISC chip designs
  18           licensed by ARM Ltd and targeted at embedded applications and
  19           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  20           manufactured, but legacy ARM-based PC hardware remains popular in
  21           Europe.  There is an ARM Linux project with a web page at
  22           <http://www.arm.linux.org.uk/>.
  23
  24 config SYS_SUPPORTS_APM_EMULATION
  25         bool
  26
  27 config GENERIC_GPIO
  28         bool
  29         default n
  30
  31 config GENERIC_TIME
  32         bool
  33         default n
  34
  35 config GENERIC_CLOCKEVENTS
  36         bool
  37         default n
  38
  39 config GENERIC_CLOCKEVENTS_BROADCAST
  40         bool
  41         depends on GENERIC_CLOCKEVENTS
  42         default y if SMP && !LOCAL_TIMERS
  43
  44 config MMU
  45         bool
  46         default y
  47
  48 config NO_IOPORT
  49         bool
  50         default n
  51
  52 config EISA
  53         bool
  54         ---help---
  55           The Extended Industry Standard Architecture (EISA) bus was
  56           developed as an open alternative to the IBM MicroChannel bus.
  57
  58           The EISA bus provided some of the features of the IBM MicroChannel
  59           bus while maintaining backward compatibility with cards made for
  60           the older ISA bus.  The EISA bus saw limited use between 1988 and
  61           1995 when it was made obsolete by the PCI bus.
  62
  63           Say Y here if you are building a kernel for an EISA-based machine.
  64
  65           Otherwise, say N.
  66
  67 config SBUS
  68         bool
  69
  70 config MCA
  71         bool
  72         help
  73           MicroChannel Architecture is found in some IBM PS/2 machines and
  74           laptops.  It is a bus system similar to PCI or ISA. See
  75           <file:Documentation/mca.txt> (and especially the web page given
  76           there) before attempting to build an MCA bus kernel.
  77
  78 config GENERIC_HARDIRQS
  79         bool
  80         default y
  81
  82 config STACKTRACE_SUPPORT
  83         bool
  84         default y
  85
  86 config LOCKDEP_SUPPORT
  87         bool
  88         default y
  89
  90 config TRACE_IRQFLAGS_SUPPORT
  91         bool
  92         default y
  93
  94 config HARDIRQS_SW_RESEND
  95         bool
  96         default y
  97
  98 config GENERIC_IRQ_PROBE
  99         bool
 100         default y
 101
 102 config GENERIC_LOCKBREAK
 103         bool
 104         default y
 105         depends on SMP && PREEMPT
 106
 107 config RWSEM_GENERIC_SPINLOCK
 108         bool
 109         default y
 110
 111 config RWSEM_XCHGADD_ALGORITHM
 112         bool
 113
 114 config ARCH_HAS_ILOG2_U32
 115         bool
 116         default n
 117
 118 config ARCH_HAS_ILOG2_U64
 119         bool
 120         default n
 121
 122 config GENERIC_HWEIGHT
 123         bool
 124         default y
 125
 126 config GENERIC_CALIBRATE_DELAY
 127         bool
 128         default y
 129
 130 config ARCH_SUPPORTS_AOUT
 131         def_bool y
 132
 133 config ARCH_MAY_HAVE_PC_FDC
 134         bool
 135
 136 config ZONE_DMA
 137         bool
 138         default y
 139
 140 config GENERIC_ISA_DMA
 141         bool
 142
 143 config FIQ
 144         bool
 145
 146 config ARCH_MTD_XIP
 147         bool
 148
 149 if OPROFILE
 150
 151 config OPROFILE_ARMV6
 152         def_bool y
 153         depends on CPU_V6 && !SMP
 154         select OPROFILE_ARM11_CORE
 155
 156 config OPROFILE_MPCORE
 157         def_bool y
 158         depends on CPU_V6 && SMP
 159         select OPROFILE_ARM11_CORE
 160
 161 config OPROFILE_ARM11_CORE
 162         bool
 163
 164 endif
 165
 166 config VECTORS_BASE
 167         hex
 168         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 169         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 170         default 0x00000000
 171         help
 172           The base address of exception vectors.
 173
 174 source "init/Kconfig"
 175
 176 menu "System Type"
 177
 178 choice
 179         prompt "ARM system type"
 180         default ARCH_VERSATILE
 181
 182 config ARCH_AAEC2000
 183         bool "Agilent AAEC-2000 based"
 184         select ARM_AMBA
 185         help
 186           This enables support for systems based on the Agilent AAEC-2000
 187
 188 config ARCH_INTEGRATOR
 189         bool "ARM Ltd. Integrator family"
 190         select ARM_AMBA
 191         select ICST525
 192         help
 193           Support for ARM's Integrator platform.
 194
 195 config ARCH_REALVIEW
 196         bool "ARM Ltd. RealView family"
 197         select ARM_AMBA
 198         select ICST307
 199         select GENERIC_TIME
 200         select GENERIC_CLOCKEVENTS
 201         help
 202           This enables support for ARM Ltd RealView boards.
 203
 204 config ARCH_VERSATILE
 205         bool "ARM Ltd. Versatile family"
 206         select ARM_AMBA
 207         select ARM_VIC
 208         select ICST307
 209         select GENERIC_TIME
 210         select GENERIC_CLOCKEVENTS
 211         help
 212           This enables support for ARM Ltd Versatile board.
 213
 214 config ARCH_AT91
 215         bool "Atmel AT91"
 216         select GENERIC_GPIO
 217         help
 218           This enables support for systems based on the Atmel AT91RM9200,
 219           AT91SAM9 and AT91CAP9 processors.
 220
 221 config ARCH_CLPS7500
 222         bool "Cirrus CL-PS7500FE"
 223         select TIMER_ACORN
 224         select ISA
 225         select NO_IOPORT
 226         select HAVE_IDE
 227         help
 228           Support for the Cirrus Logic PS7500FE system-on-a-chip.
 229
 230 config ARCH_CLPS711X
 231         bool "Cirrus Logic CLPS711x/EP721x-based"
 232         help
 233           Support for Cirrus Logic 711x/721x based boards.
 234
 235 config ARCH_CO285
 236         bool "Co-EBSA285"
 237         select FOOTBRIDGE
 238         select FOOTBRIDGE_ADDIN
 239         select HAVE_IDE
 240         help
 241           Support for Intel's EBSA285 companion chip.
 242
 243 config ARCH_EBSA110
 244         bool "EBSA-110"
 245         select ISA
 246         select NO_IOPORT
 247         help
 248           This is an evaluation board for the StrongARM processor available
 249           from Digital. It has limited hardware on-board, including an
 250           Ethernet interface, two PCMCIA sockets, two serial ports and a
 251           parallel port.
 252
 253 config ARCH_EP93XX
 254         bool "EP93xx-based"
 255         select ARM_AMBA
 256         select ARM_VIC
 257         select GENERIC_GPIO
 258         help
 259           This enables support for the Cirrus EP93xx series of CPUs.
 260
 261 config ARCH_FOOTBRIDGE
 262         bool "FootBridge"
 263         select FOOTBRIDGE
 264         select HAVE_IDE
 265         help
 266           Support for systems based on the DC21285 companion chip
 267           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 268
 269 config ARCH_NETX
 270         bool "Hilscher NetX based"
 271         select ARM_VIC
 272         help
 273           This enables support for systems based on the Hilscher NetX Soc
 274
 275 config ARCH_H720X
 276         bool "Hynix HMS720x-based"
 277         select ISA_DMA_API
 278         help
 279           This enables support for systems based on the Hynix HMS720x
 280
 281 config ARCH_IMX
 282         bool "IMX"
 283         select GENERIC_GPIO
 284         select GENERIC_TIME
 285         select GENERIC_CLOCKEVENTS
 286         help
 287           Support for Motorola's i.MX family of processors (MX1, MXL).
 288
 289 config ARCH_IOP13XX
 290         bool "IOP13xx-based"
 291         depends on MMU
 292         select PLAT_IOP
 293         select PCI
 294         select ARCH_SUPPORTS_MSI
 295         help
 296           Support for Intel's IOP13XX (XScale) family of processors.
 297
 298 config ARCH_IOP32X
 299         bool "IOP32x-based"
 300         depends on MMU
 301         select PLAT_IOP
 302         select PCI
 303         select HAVE_IDE
 304         help
 305           Support for Intel's 80219 and IOP32X (XScale) family of
 306           processors.
 307
 308 config ARCH_IOP33X
 309         bool "IOP33x-based"
 310         depends on MMU
 311         select PLAT_IOP
 312         select PCI
 313         select HAVE_IDE
 314         help
 315           Support for Intel's IOP33X (XScale) family of processors.
 316
 317 config ARCH_IXP23XX
 318         bool "IXP23XX-based"
 319         depends on MMU
 320         select HAVE_IDE
 321         select PCI
 322         help
 323           Support for Intel's IXP23xx (XScale) family of processors.
 324
 325 config ARCH_IXP2000
 326         bool "IXP2400/2800-based"
 327         depends on MMU
 328         select PCI
 329         help
 330           Support for Intel's IXP2400/2800 (XScale) family of processors.
 331
 332 config ARCH_IXP4XX
 333         bool "IXP4xx-based"
 334         depends on MMU
 335         select GENERIC_GPIO
 336         select GENERIC_TIME
 337         select GENERIC_CLOCKEVENTS
 338         select HAVE_IDE
 339         help
 340           Support for Intel's IXP4XX (XScale) family of processors.
 341
 342 config ARCH_L7200
 343         bool "LinkUp-L7200"
 344         select FIQ
 345         select HAVE_IDE
 346         help
 347           Say Y here if you intend to run this kernel on a LinkUp Systems
 348           L7200 Software Development Board which uses an ARM720T processor.
 349           Information on this board can be obtained at:
 350
 351           <http://www.linkupsys.com/>
 352
 353           If you have any questions or comments about the Linux kernel port
 354           to this board, send e-mail to <sjhill@cotw.com>.
 355
 356 config ARCH_KS8695
 357         bool "Micrel/Kendin KS8695"
 358         select GENERIC_GPIO
 359         help
 360           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 361           System-on-Chip devices.
 362
 363 config ARCH_NS9XXX
 364         bool "NetSilicon NS9xxx"
 365         select GENERIC_GPIO
 366         select GENERIC_TIME
 367         select GENERIC_CLOCKEVENTS
 368         help
 369           Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
 370           System.
 371
 372           <http://www.digi.com/products/microprocessors/index.jsp>
 373
 374 config ARCH_MXC
 375         bool "Freescale MXC/iMX-based"
 376         select ARCH_MTD_XIP
 377         help
 378           Support for Freescale MXC/iMX-based family of processors
 379
 380 config ARCH_ORION
 381         bool "Marvell Orion"
 382         depends on MMU
 383         select PCI
 384         select GENERIC_GPIO
 385         select GENERIC_TIME
 386         select GENERIC_CLOCKEVENTS
 387         help
 388           Support for Marvell Orion System on Chip family.
 389
 390 config ARCH_PNX4008
 391         bool "Philips Nexperia PNX4008 Mobile"
 392         help
 393           This enables support for Philips PNX4008 mobile platform.
 394
 395 config ARCH_PXA
 396         bool "PXA2xx/PXA3xx-based"
 397         depends on MMU
 398         select ARCH_MTD_XIP
 399         select GENERIC_GPIO
 400         select HAVE_IDE
 401         select HAVE_GPIO_LIB
 402         select GENERIC_TIME
 403         select GENERIC_CLOCKEVENTS
 404         select TICK_ONESHOT
 405         help
 406           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 407
 408 config ARCH_RPC
 409         bool "RiscPC"
 410         select ARCH_ACORN
 411         select FIQ
 412         select TIMER_ACORN
 413         select ARCH_MAY_HAVE_PC_FDC
 414         select ISA_DMA_API
 415         select NO_IOPORT
 416         select HAVE_IDE
 417         help
 418           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 419           CD-ROM interface, serial and parallel port, and the floppy drive.
 420
 421 config ARCH_SA1100
 422         bool "SA1100-based"
 423         select ISA
 424         select ARCH_DISCONTIGMEM_ENABLE
 425         select ARCH_MTD_XIP
 426         select GENERIC_GPIO
 427         select GENERIC_TIME
 428         select HAVE_IDE
 429         help
 430           Support for StrongARM 11x0 based boards.
 431
 432 config ARCH_S3C2410
 433         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
 434         select GENERIC_GPIO
 435         select HAVE_IDE
 436         help
 437           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 438           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 439           the Samsung SMDK2410 development board (and derivatives).
 440
 441 config ARCH_SHARK
 442         bool "Shark"
 443         select HAVE_IDE
 444         select ISA
 445         select ISA_DMA
 446         select PCI
 447         help
 448           Support for the StrongARM based Digital DNARD machine, also known
 449           as "Shark" (<http://www.shark-linux.de/shark.html>).
 450
 451 config ARCH_LH7A40X
 452         bool "Sharp LH7A40X"
 453         select HAVE_IDE
 454         help
 455           Say Y here for systems based on one of the Sharp LH7A40X
 456           System on a Chip processors.  These CPUs include an ARM922T
 457           core with a wide array of integrated devices for
 458           hand-held and low-power applications.
 459
 460 config ARCH_DAVINCI
 461         bool "TI DaVinci"
 462         select GENERIC_TIME
 463         select GENERIC_CLOCKEVENTS
 464         select GENERIC_GPIO
 465         help
 466           Support for TI's DaVinci platform.
 467
 468 config ARCH_OMAP
 469         bool "TI OMAP"
 470         select GENERIC_GPIO
 471         select GENERIC_TIME
 472         help
 473           Support for TI's OMAP platform (OMAP1 and OMAP2).
 474
 475 config ARCH_MSM7X00A
 476         bool "Qualcomm MSM7X00A"
 477         select GENERIC_TIME
 478         select GENERIC_CLOCKEVENTS
 479         help
 480           Support for Qualcomm MSM7X00A based systems.  This runs on the ARM11
 481           apps processor of the MSM7X00A and depends on a shared memory
 482           interface to the ARM9 modem processor which runs the baseband stack
 483           and controls some vital subsystems (clock and power control, etc).
 484           <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
 485
 486 endchoice
 487
 488 source "arch/arm/mach-clps711x/Kconfig"
 489
 490 source "arch/arm/mach-ep93xx/Kconfig"
 491
 492 source "arch/arm/mach-footbridge/Kconfig"
 493
 494 source "arch/arm/mach-integrator/Kconfig"
 495
 496 source "arch/arm/mach-iop32x/Kconfig"
 497
 498 source "arch/arm/mach-iop33x/Kconfig"
 499
 500 source "arch/arm/mach-iop13xx/Kconfig"
 501
 502 source "arch/arm/mach-ixp4xx/Kconfig"
 503
 504 source "arch/arm/mach-ixp2000/Kconfig"
 505
 506 source "arch/arm/mach-ixp23xx/Kconfig"
 507
 508 source "arch/arm/mach-pxa/Kconfig"
 509
 510 source "arch/arm/mach-sa1100/Kconfig"
 511
 512 source "arch/arm/plat-omap/Kconfig"
 513
 514 source "arch/arm/mach-omap1/Kconfig"
 515
 516 source "arch/arm/mach-omap2/Kconfig"
 517
 518 source "arch/arm/mach-orion/Kconfig"
 519
 520 source "arch/arm/plat-s3c24xx/Kconfig"
 521 source "arch/arm/plat-s3c/Kconfig"
 522
 523 if ARCH_S3C2410
 524 source "arch/arm/mach-s3c2400/Kconfig"
 525 source "arch/arm/mach-s3c2410/Kconfig"
 526 source "arch/arm/mach-s3c2412/Kconfig"
 527 source "arch/arm/mach-s3c2440/Kconfig"
 528 source "arch/arm/mach-s3c2442/Kconfig"
 529 source "arch/arm/mach-s3c2443/Kconfig"
 530 endif
 531
 532 source "arch/arm/mach-lh7a40x/Kconfig"
 533
 534 source "arch/arm/mach-imx/Kconfig"
 535
 536 source "arch/arm/mach-h720x/Kconfig"
 537
 538 source "arch/arm/mach-versatile/Kconfig"
 539
 540 source "arch/arm/mach-aaec2000/Kconfig"
 541
 542 source "arch/arm/mach-realview/Kconfig"
 543
 544 source "arch/arm/mach-at91/Kconfig"
 545
 546 source "arch/arm/plat-mxc/Kconfig"
 547
 548 source "arch/arm/mach-netx/Kconfig"
 549
 550 source "arch/arm/mach-ns9xxx/Kconfig"
 551
 552 source "arch/arm/mach-davinci/Kconfig"
 553
 554 source "arch/arm/mach-ks8695/Kconfig"
 555
 556 source "arch/arm/mach-msm/Kconfig"
 557
 558 # Definitions to make life easier
 559 config ARCH_ACORN
 560         bool
 561
 562 config PLAT_IOP
 563         bool
 564
 565 source arch/arm/mm/Kconfig
 566
 567 config IWMMXT
 568         bool "Enable iWMMXt support"
 569         depends on CPU_XSCALE || CPU_XSC3
 570         default y if PXA27x || PXA3xx
 571         help
 572           Enable support for iWMMXt context switching at run time if
 573           running on a CPU that supports it.
 574
 575 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 576 config XSCALE_PMU
 577         bool
 578         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 579         default y
 580
 581 if !MMU
 582 source "arch/arm/Kconfig-nommu"
 583 endif
 584
 585 endmenu
 586
 587 source "arch/arm/common/Kconfig"
 588
 589 config FORCE_MAX_ZONEORDER
 590         int
 591         depends on SA1111
 592         default "9"
 593
 594 menu "Bus support"
 595
 596 config ARM_AMBA
 597         bool
 598
 599 config ISA
 600         bool
 601         help
 602           Find out whether you have ISA slots on your motherboard.  ISA is the
 603           name of a bus system, i.e. the way the CPU talks to the other stuff
 604           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 605           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 606           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 607
 608 # Select ISA DMA controller support
 609 config ISA_DMA
 610         bool
 611         select ISA_DMA_API
 612
 613 # Select ISA DMA interface
 614 config ISA_DMA_API
 615         bool
 616
 617 config PCI
 618         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
 619         help
 620           Find out whether you have a PCI motherboard. PCI is the name of a
 621           bus system, i.e. the way the CPU talks to the other stuff inside
 622           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 623           VESA. If you have PCI, say Y, otherwise N.
 624
 625 config PCI_SYSCALL
 626         def_bool PCI
 627
 628 # Select the host bridge type
 629 config PCI_HOST_VIA82C505
 630         bool
 631         depends on PCI && ARCH_SHARK
 632         default y
 633
 634 config PCI_HOST_ITE8152
 635         bool
 636         depends on PCI && MACH_ARMCORE
 637         default y
 638         select DMABOUNCE
 639
 640 source "drivers/pci/Kconfig"
 641
 642 source "drivers/pcmcia/Kconfig"
 643
 644 endmenu
 645
 646 menu "Kernel Features"
 647
 648 source "kernel/time/Kconfig"
 649
 650 config SMP
 651         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 652         depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
 653         help
 654           This enables support for systems with more than one CPU. If you have
 655           a system with only one CPU, like most personal computers, say N. If
 656           you have a system with more than one CPU, say Y.
 657
 658           If you say N here, the kernel will run on single and multiprocessor
 659           machines, but will use only one CPU of a multiprocessor machine. If
 660           you say Y here, the kernel will run on many, but not all, single
 661           processor machines. On a single processor machine, the kernel will
 662           run faster if you say N here.
 663
 664           See also <file:Documentation/i386/IO-APIC.txt>,
 665           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 666           <http://www.linuxdoc.org/docs.html#howto>.
 667
 668           If you don't know what to do here, say N.
 669
 670 config NR_CPUS
 671         int "Maximum number of CPUs (2-32)"
 672         range 2 32
 673         depends on SMP
 674         default "4"
 675
 676 config HOTPLUG_CPU
 677         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 678         depends on SMP && HOTPLUG && EXPERIMENTAL
 679         help
 680           Say Y here to experiment with turning CPUs off and on.  CPUs
 681           can be controlled through /sys/devices/system/cpu.
 682
 683 config LOCAL_TIMERS
 684         bool "Use local timer interrupts"
 685         depends on SMP && REALVIEW_EB_ARM11MP
 686         default y
 687         help
 688           Enable support for local timers on SMP platforms, rather then the
 689           legacy IPI broadcast method.  Local timers allows the system
 690           accounting to be spread across the timer interval, preventing a
 691           "thundering herd" at every timer tick.
 692
 693 config PREEMPT
 694         bool "Preemptible Kernel (EXPERIMENTAL)"
 695         depends on EXPERIMENTAL
 696         help
 697           This option reduces the latency of the kernel when reacting to
 698           real-time or interactive events by allowing a low priority process to
 699           be preempted even if it is in kernel mode executing a system call.
 700           This allows applications to run more reliably even when the system is
 701           under load.
 702
 703           Say Y here if you are building a kernel for a desktop, embedded
 704           or real-time system.  Say N if you are unsure.
 705
 706 config NO_IDLE_HZ
 707         bool "Dynamic tick timer"
 708         depends on !GENERIC_CLOCKEVENTS
 709         help
 710           Select this option if you want to disable continuous timer ticks
 711           and have them programmed to occur as required. This option saves
 712           power as the system can remain in idle state for longer.
 713
 714           By default dynamic tick is disabled during the boot, and can be
 715           manually enabled with:
 716
 717             echo 1 > /sys/devices/system/timer/timer0/dyn_tick
 718
 719           Alternatively, if you want dynamic tick automatically enabled
 720           during boot, pass "dyntick=enable" via the kernel command string.
 721
 722           Please note that dynamic tick may affect the accuracy of
 723           timekeeping on some platforms depending on the implementation.
 724           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
 725           to have accurate timekeeping with dynamic tick.
 726
 727 config HZ
 728         int
 729         default 128 if ARCH_L7200
 730         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 731         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 732         default AT91_TIMER_HZ if ARCH_AT91
 733         default 100
 734
 735 config AEABI
 736         bool "Use the ARM EABI to compile the kernel"
 737         help
 738           This option allows for the kernel to be compiled using the latest
 739           ARM ABI (aka EABI).  This is only useful if you are using a user
 740           space environment that is also compiled with EABI.
 741
 742           Since there are major incompatibilities between the legacy ABI and
 743           EABI, especially with regard to structure member alignment, this
 744           option also changes the kernel syscall calling convention to
 745           disambiguate both ABIs and allow for backward compatibility support
 746           (selected with CONFIG_OABI_COMPAT).
 747
 748           To use this you need GCC version 4.0.0 or later.
 749
 750 config OABI_COMPAT
 751         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 752         depends on AEABI && EXPERIMENTAL
 753         default y
 754         help
 755           This option preserves the old syscall interface along with the
 756           new (ARM EABI) one. It also provides a compatibility layer to
 757           intercept syscalls that have structure arguments which layout
 758           in memory differs between the legacy ABI and the new ARM EABI
 759           (only for non "thumb" binaries). This option adds a tiny
 760           overhead to all syscalls and produces a slightly larger kernel.
 761           If you know you'll be using only pure EABI user space then you
 762           can say N here. If this option is not selected and you attempt
 763           to execute a legacy ABI binary then the result will be
 764           UNPREDICTABLE (in fact it can be predicted that it won't work
 765           at all). If in doubt say Y.
 766
 767 config ARCH_DISCONTIGMEM_ENABLE
 768         bool
 769         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 770         help
 771           Say Y to support efficient handling of discontiguous physical memory,
 772           for architectures which are either NUMA (Non-Uniform Memory Access)
 773           or have huge holes in the physical address space for other reasons.
 774           See <file:Documentation/vm/numa> for more.
 775
 776 config NODES_SHIFT
 777         int
 778         default "4" if ARCH_LH7A40X
 779         default "2"
 780         depends on NEED_MULTIPLE_NODES
 781
 782 source "mm/Kconfig"
 783
 784 config LEDS
 785         bool "Timer and CPU usage LEDs"
 786         depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
 787                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 788                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 789                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 790                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 791                    ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
 792                    ARCH_KS8695 || MACH_RD88F5182
 793         help
 794           If you say Y here, the LEDs on your machine will be used
 795           to provide useful information about your current system status.
 796
 797           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 798           be able to select which LEDs are active using the options below. If
 799           you are compiling a kernel for the EBSA-110 or the LART however, the
 800           red LED will simply flash regularly to indicate that the system is
 801           still functional. It is safe to say Y here if you have a CATS
 802           system, but the driver will do nothing.
 803
 804 config LEDS_TIMER
 805         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 806                             OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 807                             || MACH_OMAP_PERSEUS2
 808         depends on LEDS
 809         depends on !GENERIC_CLOCKEVENTS
 810         default y if ARCH_EBSA110
 811         help
 812           If you say Y here, one of the system LEDs (the green one on the
 813           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 814           will flash regularly to indicate that the system is still
 815           operational. This is mainly useful to kernel hackers who are
 816           debugging unstable kernels.
 817
 818           The LART uses the same LED for both Timer LED and CPU usage LED
 819           functions. You may choose to use both, but the Timer LED function
 820           will overrule the CPU usage LED.
 821
 822 config LEDS_CPU
 823         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 824                         !ARCH_OMAP) \
 825                         || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 826                         || MACH_OMAP_PERSEUS2
 827         depends on LEDS
 828         help
 829           If you say Y here, the red LED will be used to give a good real
 830           time indication of CPU usage, by lighting whenever the idle task
 831           is not currently executing.
 832
 833           The LART uses the same LED for both Timer LED and CPU usage LED
 834           functions. You may choose to use both, but the Timer LED function
 835           will overrule the CPU usage LED.
 836
 837 config ALIGNMENT_TRAP
 838         bool
 839         depends on CPU_CP15_MMU
 840         default y if !ARCH_EBSA110
 841         help
 842           ARM processors cannot fetch/store information which is not
 843           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 844           address divisible by 4. On 32-bit ARM processors, these non-aligned
 845           fetch/store instructions will be emulated in software if you say
 846           here, which has a severe performance impact. This is necessary for
 847           correct operation of some network protocols. With an IP-only
 848           configuration it is safe to say N, otherwise say Y.
 849
 850 endmenu
 851
 852 menu "Boot options"
 853
 854 # Compressed boot loader in ROM.  Yes, we really want to ask about
 855 # TEXT and BSS so we preserve their values in the config files.
 856 config ZBOOT_ROM_TEXT
 857         hex "Compressed ROM boot loader base address"
 858         default "0"
 859         help
 860           The physical address at which the ROM-able zImage is to be
 861           placed in the target.  Platforms which normally make use of
 862           ROM-able zImage formats normally set this to a suitable
 863           value in their defconfig file.
 864
 865           If ZBOOT_ROM is not enabled, this has no effect.
 866
 867 config ZBOOT_ROM_BSS
 868         hex "Compressed ROM boot loader BSS address"
 869         default "0"
 870         help
 871           The base address of an area of read/write memory in the target
 872           for the ROM-able zImage which must be available while the
 873           decompressor is running. It must be large enough to hold the
 874           entire decompressed kernel plus an additional 128 KiB.
 875           Platforms which normally make use of ROM-able zImage formats
 876           normally set this to a suitable value in their defconfig file.
 877
 878           If ZBOOT_ROM is not enabled, this has no effect.
 879
 880 config ZBOOT_ROM
 881         bool "Compressed boot loader in ROM/flash"
 882         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 883         help
 884           Say Y here if you intend to execute your compressed kernel image
 885           (zImage) directly from ROM or flash.  If unsure, say N.
 886
 887 config CMDLINE
 888         string "Default kernel command string"
 889         default ""
 890         help
 891           On some architectures (EBSA110 and CATS), there is currently no way
 892           for the boot loader to pass arguments to the kernel. For these
 893           architectures, you should supply some command-line options at build
 894           time by entering them here. As a minimum, you should specify the
 895           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 896
 897 config XIP_KERNEL
 898         bool "Kernel Execute-In-Place from ROM"
 899         depends on !ZBOOT_ROM
 900         help
 901           Execute-In-Place allows the kernel to run from non-volatile storage
 902           directly addressable by the CPU, such as NOR flash. This saves RAM
 903           space since the text section of the kernel is not loaded from flash
 904           to RAM.  Read-write sections, such as the data section and stack,
 905           are still copied to RAM.  The XIP kernel is not compressed since
 906           it has to run directly from flash, so it will take more space to
 907           store it.  The flash address used to link the kernel object files,
 908           and for storing it, is configuration dependent. Therefore, if you
 909           say Y here, you must know the proper physical address where to
 910           store the kernel image depending on your own flash memory usage.
 911
 912           Also note that the make target becomes "make xipImage" rather than
 913           "make zImage" or "make Image".  The final kernel binary to put in
 914           ROM memory will be arch/arm/boot/xipImage.
 915
 916           If unsure, say N.
 917
 918 config XIP_PHYS_ADDR
 919         hex "XIP Kernel Physical Location"
 920         depends on XIP_KERNEL
 921         default "0x00080000"
 922         help
 923           This is the physical address in your flash memory the kernel will
 924           be linked for and stored to.  This address is dependent on your
 925           own flash usage.
 926
 927 config KEXEC
 928         bool "Kexec system call (EXPERIMENTAL)"
 929         depends on EXPERIMENTAL
 930         help
 931           kexec is a system call that implements the ability to shutdown your
 932           current kernel, and to start another kernel.  It is like a reboot
 933           but it is independent of the system firmware.   And like a reboot
 934           you can start any kernel with it, not just Linux.
 935
 936           It is an ongoing process to be certain the hardware in a machine
 937           is properly shutdown, so do not be surprised if this code does not
 938           initially work for you.  It may help to enable device hotplugging
 939           support.
 940
 941 config ATAGS_PROC
 942         bool "Export atags in procfs"
 943         depends on KEXEC
 944         default y
 945         help
 946           Should the atags used to boot the kernel be exported in an "atags"
 947           file in procfs. Useful with kexec.
 948
 949 endmenu
 950
 951 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
 952
 953 menu "CPU Frequency scaling"
 954
 955 source "drivers/cpufreq/Kconfig"
 956
 957 config CPU_FREQ_SA1100
 958         bool
 959         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 960         default y
 961
 962 config CPU_FREQ_SA1110
 963         bool
 964         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 965         default y
 966
 967 config CPU_FREQ_INTEGRATOR
 968         tristate "CPUfreq driver for ARM Integrator CPUs"
 969         depends on ARCH_INTEGRATOR && CPU_FREQ
 970         default y
 971         help
 972           This enables the CPUfreq driver for ARM Integrator CPUs.
 973
 974           For details, take a look at <file:Documentation/cpu-freq>.
 975
 976           If in doubt, say Y.
 977
 978 config CPU_FREQ_IMX
 979         tristate "CPUfreq driver for i.MX CPUs"
 980         depends on ARCH_IMX && CPU_FREQ
 981         default n
 982         help
 983           This enables the CPUfreq driver for i.MX CPUs.
 984
 985           If in doubt, say N.
 986
 987 config CPU_FREQ_PXA
 988         bool
 989         depends on CPU_FREQ && ARCH_PXA && PXA25x
 990         default y
 991         select CPU_FREQ_DEFAULT_GOV_USERSPACE
 992
 993 endmenu
 994
 995 endif
 996
 997 menu "Floating point emulation"
 998
 999 comment "At least one emulation must be selected"
1000
1001 config FPE_NWFPE
1002         bool "NWFPE math emulation"
1003         depends on !AEABI || OABI_COMPAT
1004         ---help---
1005           Say Y to include the NWFPE floating point emulator in the kernel.
1006           This is necessary to run most binaries. Linux does not currently
1007           support floating point hardware so you need to say Y here even if
1008           your machine has an FPA or floating point co-processor podule.
1009
1010           You may say N here if you are going to load the Acorn FPEmulator
1011           early in the bootup.
1012
1013 config FPE_NWFPE_XP
1014         bool "Support extended precision"
1015         depends on FPE_NWFPE
1016         help
1017           Say Y to include 80-bit support in the kernel floating-point
1018           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
1019           Note that gcc does not generate 80-bit operations by default,
1020           so in most cases this option only enlarges the size of the
1021           floating point emulator without any good reason.
1022
1023           You almost surely want to say N here.
1024
1025 config FPE_FASTFPE
1026         bool "FastFPE math emulation (EXPERIMENTAL)"
1027         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1028         ---help---
1029           Say Y here to include the FAST floating point emulator in the kernel.
1030           This is an experimental much faster emulator which now also has full
1031           precision for the mantissa.  It does not support any exceptions.
1032           It is very simple, and approximately 3-6 times faster than NWFPE.
1033
1034           It should be sufficient for most programs.  It may be not suitable
1035           for scientific calculations, but you have to check this for yourself.
1036           If you do not feel you need a faster FP emulation you should better
1037           choose NWFPE.
1038
1039 config VFP
1040         bool "VFP-format floating point maths"
1041         depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1042         help
1043           Say Y to include VFP support code in the kernel. This is needed
1044           if your hardware includes a VFP unit.
1045
1046           Please see <file:Documentation/arm/VFP/release-notes.txt> for
1047           release notes and additional status information.
1048
1049           Say N if your target does not have VFP hardware.
1050
1051 config VFPv3
1052         bool
1053         depends on VFP
1054         default y if CPU_V7
1055
1056 config NEON
1057         bool "Advanced SIMD (NEON) Extension support"
1058         depends on VFPv3 && CPU_V7
1059         help
1060           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1061           Extension.
1062
1063 endmenu
1064
1065 menu "Userspace binary formats"
1066
1067 source "fs/Kconfig.binfmt"
1068
1069 config ARTHUR
1070         tristate "RISC OS personality"
1071         depends on !AEABI
1072         help
1073           Say Y here to include the kernel code necessary if you want to run
1074           Acorn RISC OS/Arthur binaries under Linux. This code is still very
1075           experimental; if this sounds frightening, say N and sleep in peace.
1076           You can also say M here to compile this support as a module (which
1077           will be called arthur).
1078
1079 endmenu
1080
1081 menu "Power management options"
1082
1083 source "kernel/power/Kconfig"
1084
1085 config ARCH_SUSPEND_POSSIBLE
1086         def_bool y
1087
1088 endmenu
1089
1090 source "net/Kconfig"
1091
1092 menu "Device Drivers"
1093
1094 source "drivers/base/Kconfig"
1095
1096 source "drivers/connector/Kconfig"
1097
1098 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1099 source "drivers/mtd/Kconfig"
1100 endif
1101
1102 source "drivers/parport/Kconfig"
1103
1104 source "drivers/pnp/Kconfig"
1105
1106 source "drivers/block/Kconfig"
1107
1108 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1109
1110 source "drivers/misc/Kconfig"
1111
1112 source "drivers/ide/Kconfig"
1113
1114 source "drivers/scsi/Kconfig"
1115
1116 source "drivers/ata/Kconfig"
1117
1118 source "drivers/md/Kconfig"
1119
1120 source "drivers/message/fusion/Kconfig"
1121
1122 source "drivers/ieee1394/Kconfig"
1123
1124 source "drivers/message/i2o/Kconfig"
1125
1126 source "drivers/net/Kconfig"
1127
1128 source "drivers/isdn/Kconfig"
1129
1130 # input before char - char/joystick depends on it. As does USB.
1131
1132 source "drivers/input/Kconfig"
1133
1134 source "drivers/char/Kconfig"
1135
1136 source "drivers/i2c/Kconfig"
1137
1138 source "drivers/spi/Kconfig"
1139
1140 source "drivers/gpio/Kconfig"
1141
1142 source "drivers/w1/Kconfig"
1143
1144 source "drivers/power/Kconfig"
1145
1146 source "drivers/hwmon/Kconfig"
1147
1148 source "drivers/watchdog/Kconfig"
1149
1150 source "drivers/ssb/Kconfig"
1151
1152 #source "drivers/l3/Kconfig"
1153
1154 source "drivers/mfd/Kconfig"
1155
1156 source "drivers/media/Kconfig"
1157
1158 source "drivers/video/Kconfig"
1159
1160 source "sound/Kconfig"
1161
1162 source "drivers/hid/Kconfig"
1163
1164 source "drivers/usb/Kconfig"
1165
1166 source "drivers/mmc/Kconfig"
1167
1168 source "drivers/leds/Kconfig"
1169
1170 source "drivers/rtc/Kconfig"
1171
1172 source "drivers/dma/Kconfig"
1173
1174 source "drivers/dca/Kconfig"
1175
1176 endmenu
1177
1178 source "fs/Kconfig"
1179
1180 source "arch/arm/Kconfig.debug"
1181
1182 source "security/Kconfig"
1183
1184 source "crypto/Kconfig"
1185
1186 source "lib/Kconfig"