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 HAVE_AOUT
  12         select HAVE_IDE
  13         select RTC_LIB
  14         select SYS_SUPPORTS_APM_EMULATION
  15         select HAVE_OPROFILE
  16         select HAVE_ARCH_KGDB
  17         select HAVE_KPROBES if (!XIP_KERNEL)
  18         select HAVE_KRETPROBES if (HAVE_KPROBES)
  19         select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  20         select HAVE_GENERIC_DMA_COHERENT
  21         help
  22           The ARM series is a line of low-power-consumption RISC chip designs
  23           licensed by ARM Ltd and targeted at embedded applications and
  24           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  25           manufactured, but legacy ARM-based PC hardware remains popular in
  26           Europe.  There is an ARM Linux project with a web page at
  27           <http://www.arm.linux.org.uk/>.
  28
  29 config HAVE_PWM
  30         bool
  31
  32 config SYS_SUPPORTS_APM_EMULATION
  33         bool
  34
  35 config GENERIC_GPIO
  36         bool
  37         default n
  38
  39 config GENERIC_TIME
  40         bool
  41         default n
  42
  43 config GENERIC_CLOCKEVENTS
  44         bool
  45         default n
  46
  47 config GENERIC_CLOCKEVENTS_BROADCAST
  48         bool
  49         depends on GENERIC_CLOCKEVENTS
  50         default y if SMP && !LOCAL_TIMERS
  51
  52 config MMU
  53         bool
  54         default y
  55
  56 config NO_IOPORT
  57         bool
  58         default n
  59
  60 config EISA
  61         bool
  62         ---help---
  63           The Extended Industry Standard Architecture (EISA) bus was
  64           developed as an open alternative to the IBM MicroChannel bus.
  65
  66           The EISA bus provided some of the features of the IBM MicroChannel
  67           bus while maintaining backward compatibility with cards made for
  68           the older ISA bus.  The EISA bus saw limited use between 1988 and
  69           1995 when it was made obsolete by the PCI bus.
  70
  71           Say Y here if you are building a kernel for an EISA-based machine.
  72
  73           Otherwise, say N.
  74
  75 config SBUS
  76         bool
  77
  78 config MCA
  79         bool
  80         help
  81           MicroChannel Architecture is found in some IBM PS/2 machines and
  82           laptops.  It is a bus system similar to PCI or ISA. See
  83           <file:Documentation/mca.txt> (and especially the web page given
  84           there) before attempting to build an MCA bus kernel.
  85
  86 config GENERIC_HARDIRQS
  87         bool
  88         default y
  89
  90 config STACKTRACE_SUPPORT
  91         bool
  92         default y
  93
  94 config HAVE_LATENCYTOP_SUPPORT
  95         bool
  96         depends on !SMP
  97         default y
  98
  99 config LOCKDEP_SUPPORT
 100         bool
 101         default y
 102
 103 config TRACE_IRQFLAGS_SUPPORT
 104         bool
 105         default y
 106
 107 config HARDIRQS_SW_RESEND
 108         bool
 109         default y
 110
 111 config GENERIC_IRQ_PROBE
 112         bool
 113         default y
 114
 115 config GENERIC_LOCKBREAK
 116         bool
 117         default y
 118         depends on SMP && PREEMPT
 119
 120 config RWSEM_GENERIC_SPINLOCK
 121         bool
 122         default y
 123
 124 config RWSEM_XCHGADD_ALGORITHM
 125         bool
 126
 127 config ARCH_HAS_ILOG2_U32
 128         bool
 129         default n
 130
 131 config ARCH_HAS_ILOG2_U64
 132         bool
 133         default n
 134
 135 config GENERIC_HWEIGHT
 136         bool
 137         default y
 138
 139 config GENERIC_CALIBRATE_DELAY
 140         bool
 141         default y
 142
 143 config ARCH_MAY_HAVE_PC_FDC
 144         bool
 145
 146 config ZONE_DMA
 147         bool
 148
 149 config GENERIC_ISA_DMA
 150         bool
 151
 152 config FIQ
 153         bool
 154
 155 config ARCH_MTD_XIP
 156         bool
 157
 158 config GENERIC_HARDIRQS_NO__DO_IRQ
 159         bool
 160         def_bool y
 161
 162 if OPROFILE
 163
 164 config OPROFILE_ARMV6
 165         def_bool y
 166         depends on CPU_V6 && !SMP
 167         select OPROFILE_ARM11_CORE
 168
 169 config OPROFILE_MPCORE
 170         def_bool y
 171         depends on CPU_V6 && SMP
 172         select OPROFILE_ARM11_CORE
 173
 174 config OPROFILE_ARM11_CORE
 175         bool
 176
 177 config OPROFILE_ARMV7
 178         def_bool y
 179         depends on CPU_V7 && !SMP
 180         bool
 181
 182 endif
 183
 184 config VECTORS_BASE
 185         hex
 186         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 187         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 188         default 0x00000000
 189         help
 190           The base address of exception vectors.
 191
 192 source "init/Kconfig"
 193
 194 source "kernel/Kconfig.freezer"
 195
 196 menu "System Type"
 197
 198 choice
 199         prompt "ARM system type"
 200         default ARCH_VERSATILE
 201
 202 config ARCH_AAEC2000
 203         bool "Agilent AAEC-2000 based"
 204         select ARM_AMBA
 205         select HAVE_CLK
 206         help
 207           This enables support for systems based on the Agilent AAEC-2000
 208
 209 config ARCH_INTEGRATOR
 210         bool "ARM Ltd. Integrator family"
 211         select ARM_AMBA
 212         select HAVE_CLK
 213         select COMMON_CLKDEV
 214         select ICST525
 215         help
 216           Support for ARM's Integrator platform.
 217
 218 config ARCH_REALVIEW
 219         bool "ARM Ltd. RealView family"
 220         select ARM_AMBA
 221         select HAVE_CLK
 222         select COMMON_CLKDEV
 223         select ICST307
 224         select GENERIC_TIME
 225         select GENERIC_CLOCKEVENTS
 226         help
 227           This enables support for ARM Ltd RealView boards.
 228
 229 config ARCH_VERSATILE
 230         bool "ARM Ltd. Versatile family"
 231         select ARM_AMBA
 232         select ARM_VIC
 233         select HAVE_CLK
 234         select COMMON_CLKDEV
 235         select ICST307
 236         select GENERIC_TIME
 237         select GENERIC_CLOCKEVENTS
 238         help
 239           This enables support for ARM Ltd Versatile board.
 240
 241 config ARCH_AT91
 242         bool "Atmel AT91"
 243         select GENERIC_GPIO
 244         select HAVE_CLK
 245         help
 246           This enables support for systems based on the Atmel AT91RM9200,
 247           AT91SAM9 and AT91CAP9 processors.
 248
 249 config ARCH_CLPS7500
 250         bool "Cirrus CL-PS7500FE"
 251         select TIMER_ACORN
 252         select ISA
 253         select NO_IOPORT
 254         select ARCH_SPARSEMEM_ENABLE
 255         help
 256           Support for the Cirrus Logic PS7500FE system-on-a-chip.
 257
 258 config ARCH_CLPS711X
 259         bool "Cirrus Logic CLPS711x/EP721x-based"
 260         help
 261           Support for Cirrus Logic 711x/721x based boards.
 262
 263 config ARCH_EBSA110
 264         bool "EBSA-110"
 265         select ISA
 266         select NO_IOPORT
 267         help
 268           This is an evaluation board for the StrongARM processor available
 269           from Digital. It has limited hardware on-board, including an
 270           Ethernet interface, two PCMCIA sockets, two serial ports and a
 271           parallel port.
 272
 273 config ARCH_EP93XX
 274         bool "EP93xx-based"
 275         select ARM_AMBA
 276         select ARM_VIC
 277         select GENERIC_GPIO
 278         select HAVE_CLK
 279         select ARCH_REQUIRE_GPIOLIB
 280         help
 281           This enables support for the Cirrus EP93xx series of CPUs.
 282
 283 config ARCH_FOOTBRIDGE
 284         bool "FootBridge"
 285         select FOOTBRIDGE
 286         help
 287           Support for systems based on the DC21285 companion chip
 288           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 289
 290 config ARCH_NETX
 291         bool "Hilscher NetX based"
 292         select ARM_VIC
 293         help
 294           This enables support for systems based on the Hilscher NetX Soc
 295
 296 config ARCH_H720X
 297         bool "Hynix HMS720x-based"
 298         select ISA_DMA_API
 299         help
 300           This enables support for systems based on the Hynix HMS720x
 301
 302 config ARCH_IMX
 303         bool "IMX"
 304         select GENERIC_GPIO
 305         select GENERIC_TIME
 306         select GENERIC_CLOCKEVENTS
 307         help
 308           Support for Motorola's i.MX family of processors (MX1, MXL).
 309
 310 config ARCH_IOP13XX
 311         bool "IOP13xx-based"
 312         depends on MMU
 313         select PLAT_IOP
 314         select PCI
 315         select ARCH_SUPPORTS_MSI
 316         select VMSPLIT_1G
 317         help
 318           Support for Intel's IOP13XX (XScale) family of processors.
 319
 320 config ARCH_IOP32X
 321         bool "IOP32x-based"
 322         depends on MMU
 323         select PLAT_IOP
 324         select PCI
 325         select GENERIC_GPIO
 326         select ARCH_REQUIRE_GPIOLIB
 327         help
 328           Support for Intel's 80219 and IOP32X (XScale) family of
 329           processors.
 330
 331 config ARCH_IOP33X
 332         bool "IOP33x-based"
 333         depends on MMU
 334         select PLAT_IOP
 335         select PCI
 336         select GENERIC_GPIO
 337         select ARCH_REQUIRE_GPIOLIB
 338         help
 339           Support for Intel's IOP33X (XScale) family of processors.
 340
 341 config ARCH_IXP23XX
 342         bool "IXP23XX-based"
 343         depends on MMU
 344         select PCI
 345         help
 346           Support for Intel's IXP23xx (XScale) family of processors.
 347
 348 config ARCH_IXP2000
 349         bool "IXP2400/2800-based"
 350         depends on MMU
 351         select PCI
 352         help
 353           Support for Intel's IXP2400/2800 (XScale) family of processors.
 354
 355 config ARCH_IXP4XX
 356         bool "IXP4xx-based"
 357         depends on MMU
 358         select GENERIC_GPIO
 359         select GENERIC_TIME
 360         select GENERIC_CLOCKEVENTS
 361         select DMABOUNCE if PCI
 362         help
 363           Support for Intel's IXP4XX (XScale) family of processors.
 364
 365 config ARCH_L7200
 366         bool "LinkUp-L7200"
 367         select FIQ
 368         help
 369           Say Y here if you intend to run this kernel on a LinkUp Systems
 370           L7200 Software Development Board which uses an ARM720T processor.
 371           Information on this board can be obtained at:
 372
 373           <http://www.linkupsys.com/>
 374
 375           If you have any questions or comments about the Linux kernel port
 376           to this board, send e-mail to <sjhill@cotw.com>.
 377
 378 config ARCH_KIRKWOOD
 379         bool "Marvell Kirkwood"
 380         select PCI
 381         select GENERIC_TIME
 382         select GENERIC_CLOCKEVENTS
 383         select PLAT_ORION
 384         help
 385           Support for the following Marvell Kirkwood series SoCs:
 386           88F6180, 88F6192 and 88F6281.
 387
 388 config ARCH_KS8695
 389         bool "Micrel/Kendin KS8695"
 390         select GENERIC_GPIO
 391         help
 392           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 393           System-on-Chip devices.
 394
 395 config ARCH_NS9XXX
 396         bool "NetSilicon NS9xxx"
 397         select GENERIC_GPIO
 398         select GENERIC_TIME
 399         select GENERIC_CLOCKEVENTS
 400         select HAVE_CLK
 401         help
 402           Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
 403           System.
 404
 405           <http://www.digi.com/products/microprocessors/index.jsp>
 406
 407 config ARCH_LOKI
 408         bool "Marvell Loki (88RC8480)"
 409         select GENERIC_TIME
 410         select GENERIC_CLOCKEVENTS
 411         select PLAT_ORION
 412         help
 413           Support for the Marvell Loki (88RC8480) SoC.
 414
 415 config ARCH_MV78XX0
 416         bool "Marvell MV78xx0"
 417         select PCI
 418         select GENERIC_TIME
 419         select GENERIC_CLOCKEVENTS
 420         select PLAT_ORION
 421         help
 422           Support for the following Marvell MV78xx0 series SoCs:
 423           MV781x0, MV782x0.
 424
 425 config ARCH_MXC
 426         bool "Freescale MXC/iMX-based"
 427         select GENERIC_TIME
 428         select GENERIC_CLOCKEVENTS
 429         select ARCH_MTD_XIP
 430         select GENERIC_GPIO
 431         select ARCH_REQUIRE_GPIOLIB
 432         help
 433           Support for Freescale MXC/iMX-based family of processors
 434
 435 config ARCH_ORION5X
 436         bool "Marvell Orion"
 437         depends on MMU
 438         select PCI
 439         select GENERIC_GPIO
 440         select GENERIC_TIME
 441         select GENERIC_CLOCKEVENTS
 442         select PLAT_ORION
 443         help
 444           Support for the following Marvell Orion 5x series SoCs:
 445           Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
 446           Orion-2 (5281), Orion-1-90 (6183).
 447
 448 config ARCH_PNX4008
 449         bool "Philips Nexperia PNX4008 Mobile"
 450         select HAVE_CLK
 451         help
 452           This enables support for Philips PNX4008 mobile platform.
 453
 454 config ARCH_PXA
 455         bool "PXA2xx/PXA3xx-based"
 456         depends on MMU
 457         select ARCH_MTD_XIP
 458         select GENERIC_GPIO
 459         select HAVE_CLK
 460         select ARCH_REQUIRE_GPIOLIB
 461         select GENERIC_TIME
 462         select GENERIC_CLOCKEVENTS
 463         select TICK_ONESHOT
 464         help
 465           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 466
 467 config ARCH_RPC
 468         bool "RiscPC"
 469         select ARCH_ACORN
 470         select FIQ
 471         select TIMER_ACORN
 472         select ARCH_MAY_HAVE_PC_FDC
 473         select HAVE_PATA_PLATFORM
 474         select ISA_DMA_API
 475         select NO_IOPORT
 476         select ARCH_SPARSEMEM_ENABLE
 477         help
 478           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 479           CD-ROM interface, serial and parallel port, and the floppy drive.
 480
 481 config ARCH_SA1100
 482         bool "SA1100-based"
 483         select ISA
 484         select ARCH_SPARSEMEM_ENABLE
 485         select ARCH_MTD_XIP
 486         select GENERIC_GPIO
 487         select GENERIC_TIME
 488         select GENERIC_CLOCKEVENTS
 489         select HAVE_CLK
 490         select TICK_ONESHOT
 491         select ARCH_REQUIRE_GPIOLIB
 492         help
 493           Support for StrongARM 11x0 based boards.
 494
 495 config ARCH_S3C2410
 496         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
 497         select GENERIC_GPIO
 498         select HAVE_CLK
 499         help
 500           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 501           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 502           the Samsung SMDK2410 development board (and derivatives).
 503
 504 config ARCH_SHARK
 505         bool "Shark"
 506         select ISA
 507         select ISA_DMA
 508         select ZONE_DMA
 509         select PCI
 510         help
 511           Support for the StrongARM based Digital DNARD machine, also known
 512           as "Shark" (<http://www.shark-linux.de/shark.html>).
 513
 514 config ARCH_LH7A40X
 515         bool "Sharp LH7A40X"
 516         select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
 517         select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
 518         help
 519           Say Y here for systems based on one of the Sharp LH7A40X
 520           System on a Chip processors.  These CPUs include an ARM922T
 521           core with a wide array of integrated devices for
 522           hand-held and low-power applications.
 523
 524 config ARCH_DAVINCI
 525         bool "TI DaVinci"
 526         select GENERIC_TIME
 527         select GENERIC_CLOCKEVENTS
 528         select GENERIC_GPIO
 529         select ARCH_REQUIRE_GPIOLIB
 530         select HAVE_CLK
 531         select ZONE_DMA
 532         help
 533           Support for TI's DaVinci platform.
 534
 535 config ARCH_OMAP
 536         bool "TI OMAP"
 537         select GENERIC_GPIO
 538         select HAVE_CLK
 539         select ARCH_REQUIRE_GPIOLIB
 540         select GENERIC_TIME
 541         select GENERIC_CLOCKEVENTS
 542         help
 543           Support for TI's OMAP platform (OMAP1 and OMAP2).
 544
 545 config ARCH_MSM
 546         bool "Qualcomm MSM"
 547         select GENERIC_TIME
 548         select GENERIC_CLOCKEVENTS
 549         help
 550           Support for Qualcomm MSM7K based systems.  This runs on the ARM11
 551           apps processor of the MSM7K and depends on a shared memory
 552           interface to the ARM9 modem processor which runs the baseband stack
 553           and controls some vital subsystems (clock and power control, etc).
 554
 555 endchoice
 556
 557 source "arch/arm/mach-clps711x/Kconfig"
 558
 559 source "arch/arm/mach-ep93xx/Kconfig"
 560
 561 source "arch/arm/mach-footbridge/Kconfig"
 562
 563 source "arch/arm/mach-integrator/Kconfig"
 564
 565 source "arch/arm/mach-iop32x/Kconfig"
 566
 567 source "arch/arm/mach-iop33x/Kconfig"
 568
 569 source "arch/arm/mach-iop13xx/Kconfig"
 570
 571 source "arch/arm/mach-ixp4xx/Kconfig"
 572
 573 source "arch/arm/mach-ixp2000/Kconfig"
 574
 575 source "arch/arm/mach-ixp23xx/Kconfig"
 576
 577 source "arch/arm/mach-loki/Kconfig"
 578
 579 source "arch/arm/mach-mv78xx0/Kconfig"
 580
 581 source "arch/arm/mach-pxa/Kconfig"
 582
 583 source "arch/arm/mach-sa1100/Kconfig"
 584
 585 source "arch/arm/plat-omap/Kconfig"
 586
 587 source "arch/arm/mach-omap1/Kconfig"
 588
 589 source "arch/arm/mach-omap2/Kconfig"
 590
 591 source "arch/arm/mach-orion5x/Kconfig"
 592
 593 source "arch/arm/mach-kirkwood/Kconfig"
 594
 595 source "arch/arm/plat-s3c24xx/Kconfig"
 596 source "arch/arm/plat-s3c/Kconfig"
 597
 598 if ARCH_S3C2410
 599 source "arch/arm/mach-s3c2400/Kconfig"
 600 source "arch/arm/mach-s3c2410/Kconfig"
 601 source "arch/arm/mach-s3c2412/Kconfig"
 602 source "arch/arm/mach-s3c2440/Kconfig"
 603 source "arch/arm/mach-s3c2442/Kconfig"
 604 source "arch/arm/mach-s3c2443/Kconfig"
 605 endif
 606
 607 source "arch/arm/mach-lh7a40x/Kconfig"
 608
 609 source "arch/arm/mach-imx/Kconfig"
 610
 611 source "arch/arm/mach-h720x/Kconfig"
 612
 613 source "arch/arm/mach-versatile/Kconfig"
 614
 615 source "arch/arm/mach-aaec2000/Kconfig"
 616
 617 source "arch/arm/mach-realview/Kconfig"
 618
 619 source "arch/arm/mach-at91/Kconfig"
 620
 621 source "arch/arm/plat-mxc/Kconfig"
 622
 623 source "arch/arm/mach-netx/Kconfig"
 624
 625 source "arch/arm/mach-ns9xxx/Kconfig"
 626
 627 source "arch/arm/mach-davinci/Kconfig"
 628
 629 source "arch/arm/mach-ks8695/Kconfig"
 630
 631 source "arch/arm/mach-msm/Kconfig"
 632
 633 # Definitions to make life easier
 634 config ARCH_ACORN
 635         bool
 636
 637 config PLAT_IOP
 638         bool
 639
 640 config PLAT_ORION
 641         bool
 642
 643 source arch/arm/mm/Kconfig
 644
 645 config IWMMXT
 646         bool "Enable iWMMXt support"
 647         depends on CPU_XSCALE || CPU_XSC3
 648         default y if PXA27x || PXA3xx
 649         help
 650           Enable support for iWMMXt context switching at run time if
 651           running on a CPU that supports it.
 652
 653 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 654 config XSCALE_PMU
 655         bool
 656         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 657         default y
 658
 659 if !MMU
 660 source "arch/arm/Kconfig-nommu"
 661 endif
 662
 663 endmenu
 664
 665 source "arch/arm/common/Kconfig"
 666
 667 config FORCE_MAX_ZONEORDER
 668         int
 669         depends on SA1111
 670         default "9"
 671
 672 menu "Bus support"
 673
 674 config ARM_AMBA
 675         bool
 676
 677 config ISA
 678         bool
 679         help
 680           Find out whether you have ISA slots on your motherboard.  ISA is the
 681           name of a bus system, i.e. the way the CPU talks to the other stuff
 682           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 683           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 684           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 685
 686 # Select ISA DMA controller support
 687 config ISA_DMA
 688         bool
 689         select ISA_DMA_API
 690
 691 # Select ISA DMA interface
 692 config ISA_DMA_API
 693         bool
 694
 695 config PCI
 696         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
 697         help
 698           Find out whether you have a PCI motherboard. PCI is the name of a
 699           bus system, i.e. the way the CPU talks to the other stuff inside
 700           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 701           VESA. If you have PCI, say Y, otherwise N.
 702
 703 config PCI_SYSCALL
 704         def_bool PCI
 705
 706 # Select the host bridge type
 707 config PCI_HOST_VIA82C505
 708         bool
 709         depends on PCI && ARCH_SHARK
 710         default y
 711
 712 config PCI_HOST_ITE8152
 713         bool
 714         depends on PCI && MACH_ARMCORE
 715         default y
 716         select DMABOUNCE
 717
 718 source "drivers/pci/Kconfig"
 719
 720 source "drivers/pcmcia/Kconfig"
 721
 722 endmenu
 723
 724 menu "Kernel Features"
 725
 726 source "kernel/time/Kconfig"
 727
 728 config SMP
 729         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 730         depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 731         select USE_GENERIC_SMP_HELPERS
 732         help
 733           This enables support for systems with more than one CPU. If you have
 734           a system with only one CPU, like most personal computers, say N. If
 735           you have a system with more than one CPU, say Y.
 736
 737           If you say N here, the kernel will run on single and multiprocessor
 738           machines, but will use only one CPU of a multiprocessor machine. If
 739           you say Y here, the kernel will run on many, but not all, single
 740           processor machines. On a single processor machine, the kernel will
 741           run faster if you say N here.
 742
 743           See also <file:Documentation/i386/IO-APIC.txt>,
 744           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 745           <http://www.linuxdoc.org/docs.html#howto>.
 746
 747           If you don't know what to do here, say N.
 748
 749 choice
 750         prompt "Memory split"
 751         default VMSPLIT_3G
 752         help
 753           Select the desired split between kernel and user memory.
 754
 755           If you are not absolutely sure what you are doing, leave this
 756           option alone!
 757
 758         config VMSPLIT_3G
 759                 bool "3G/1G user/kernel split"
 760         config VMSPLIT_2G
 761                 bool "2G/2G user/kernel split"
 762         config VMSPLIT_1G
 763                 bool "1G/3G user/kernel split"
 764 endchoice
 765
 766 config PAGE_OFFSET
 767         hex
 768         default 0x40000000 if VMSPLIT_1G
 769         default 0x80000000 if VMSPLIT_2G
 770         default 0xC0000000
 771
 772 config NR_CPUS
 773         int "Maximum number of CPUs (2-32)"
 774         range 2 32
 775         depends on SMP
 776         default "4"
 777
 778 config HOTPLUG_CPU
 779         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 780         depends on SMP && HOTPLUG && EXPERIMENTAL
 781         help
 782           Say Y here to experiment with turning CPUs off and on.  CPUs
 783           can be controlled through /sys/devices/system/cpu.
 784
 785 config LOCAL_TIMERS
 786         bool "Use local timer interrupts"
 787         depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 788         default y
 789         help
 790           Enable support for local timers on SMP platforms, rather then the
 791           legacy IPI broadcast method.  Local timers allows the system
 792           accounting to be spread across the timer interval, preventing a
 793           "thundering herd" at every timer tick.
 794
 795 config PREEMPT
 796         bool "Preemptible Kernel (EXPERIMENTAL)"
 797         depends on EXPERIMENTAL
 798         help
 799           This option reduces the latency of the kernel when reacting to
 800           real-time or interactive events by allowing a low priority process to
 801           be preempted even if it is in kernel mode executing a system call.
 802           This allows applications to run more reliably even when the system is
 803           under load.
 804
 805           Say Y here if you are building a kernel for a desktop, embedded
 806           or real-time system.  Say N if you are unsure.
 807
 808 config HZ
 809         int
 810         default 128 if ARCH_L7200
 811         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 812         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 813         default AT91_TIMER_HZ if ARCH_AT91
 814         default 100
 815
 816 config AEABI
 817         bool "Use the ARM EABI to compile the kernel"
 818         help
 819           This option allows for the kernel to be compiled using the latest
 820           ARM ABI (aka EABI).  This is only useful if you are using a user
 821           space environment that is also compiled with EABI.
 822
 823           Since there are major incompatibilities between the legacy ABI and
 824           EABI, especially with regard to structure member alignment, this
 825           option also changes the kernel syscall calling convention to
 826           disambiguate both ABIs and allow for backward compatibility support
 827           (selected with CONFIG_OABI_COMPAT).
 828
 829           To use this you need GCC version 4.0.0 or later.
 830
 831 config OABI_COMPAT
 832         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 833         depends on AEABI && EXPERIMENTAL
 834         default y
 835         help
 836           This option preserves the old syscall interface along with the
 837           new (ARM EABI) one. It also provides a compatibility layer to
 838           intercept syscalls that have structure arguments which layout
 839           in memory differs between the legacy ABI and the new ARM EABI
 840           (only for non "thumb" binaries). This option adds a tiny
 841           overhead to all syscalls and produces a slightly larger kernel.
 842           If you know you'll be using only pure EABI user space then you
 843           can say N here. If this option is not selected and you attempt
 844           to execute a legacy ABI binary then the result will be
 845           UNPREDICTABLE (in fact it can be predicted that it won't work
 846           at all). If in doubt say Y.
 847
 848 config ARCH_FLATMEM_HAS_HOLES
 849         bool
 850         default y
 851         depends on FLATMEM
 852
 853 # Discontigmem is deprecated
 854 config ARCH_DISCONTIGMEM_ENABLE
 855         bool
 856
 857 config ARCH_SPARSEMEM_ENABLE
 858         bool
 859
 860 config ARCH_SPARSEMEM_DEFAULT
 861         def_bool ARCH_SPARSEMEM_ENABLE
 862
 863 config ARCH_SELECT_MEMORY_MODEL
 864         def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
 865
 866 config NODES_SHIFT
 867         int
 868         default "4" if ARCH_LH7A40X
 869         default "2"
 870         depends on NEED_MULTIPLE_NODES
 871
 872 source "mm/Kconfig"
 873
 874 config LEDS
 875         bool "Timer and CPU usage LEDs"
 876         depends on ARCH_CDB89712 || ARCH_EBSA110 || \
 877                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 878                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 879                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 880                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 881                    ARCH_AT91 || ARCH_DAVINCI || \
 882                    ARCH_KS8695 || MACH_RD88F5182
 883         help
 884           If you say Y here, the LEDs on your machine will be used
 885           to provide useful information about your current system status.
 886
 887           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 888           be able to select which LEDs are active using the options below. If
 889           you are compiling a kernel for the EBSA-110 or the LART however, the
 890           red LED will simply flash regularly to indicate that the system is
 891           still functional. It is safe to say Y here if you have a CATS
 892           system, but the driver will do nothing.
 893
 894 config LEDS_TIMER
 895         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 896                             OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 897                             || MACH_OMAP_PERSEUS2
 898         depends on LEDS
 899         depends on !GENERIC_CLOCKEVENTS
 900         default y if ARCH_EBSA110
 901         help
 902           If you say Y here, one of the system LEDs (the green one on the
 903           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 904           will flash regularly to indicate that the system is still
 905           operational. This is mainly useful to kernel hackers who are
 906           debugging unstable kernels.
 907
 908           The LART uses the same LED for both Timer LED and CPU usage LED
 909           functions. You may choose to use both, but the Timer LED function
 910           will overrule the CPU usage LED.
 911
 912 config LEDS_CPU
 913         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 914                         !ARCH_OMAP) \
 915                         || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 916                         || MACH_OMAP_PERSEUS2
 917         depends on LEDS
 918         help
 919           If you say Y here, the red LED will be used to give a good real
 920           time indication of CPU usage, by lighting whenever the idle task
 921           is not currently executing.
 922
 923           The LART uses the same LED for both Timer LED and CPU usage LED
 924           functions. You may choose to use both, but the Timer LED function
 925           will overrule the CPU usage LED.
 926
 927 config ALIGNMENT_TRAP
 928         bool
 929         depends on CPU_CP15_MMU
 930         default y if !ARCH_EBSA110
 931         help
 932           ARM processors cannot fetch/store information which is not
 933           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 934           address divisible by 4. On 32-bit ARM processors, these non-aligned
 935           fetch/store instructions will be emulated in software if you say
 936           here, which has a severe performance impact. This is necessary for
 937           correct operation of some network protocols. With an IP-only
 938           configuration it is safe to say N, otherwise say Y.
 939
 940 endmenu
 941
 942 menu "Boot options"
 943
 944 # Compressed boot loader in ROM.  Yes, we really want to ask about
 945 # TEXT and BSS so we preserve their values in the config files.
 946 config ZBOOT_ROM_TEXT
 947         hex "Compressed ROM boot loader base address"
 948         default "0"
 949         help
 950           The physical address at which the ROM-able zImage is to be
 951           placed in the target.  Platforms which normally make use of
 952           ROM-able zImage formats normally set this to a suitable
 953           value in their defconfig file.
 954
 955           If ZBOOT_ROM is not enabled, this has no effect.
 956
 957 config ZBOOT_ROM_BSS
 958         hex "Compressed ROM boot loader BSS address"
 959         default "0"
 960         help
 961           The base address of an area of read/write memory in the target
 962           for the ROM-able zImage which must be available while the
 963           decompressor is running. It must be large enough to hold the
 964           entire decompressed kernel plus an additional 128 KiB.
 965           Platforms which normally make use of ROM-able zImage formats
 966           normally set this to a suitable value in their defconfig file.
 967
 968           If ZBOOT_ROM is not enabled, this has no effect.
 969
 970 config ZBOOT_ROM
 971         bool "Compressed boot loader in ROM/flash"
 972         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 973         help
 974           Say Y here if you intend to execute your compressed kernel image
 975           (zImage) directly from ROM or flash.  If unsure, say N.
 976
 977 config CMDLINE
 978         string "Default kernel command string"
 979         default ""
 980         help
 981           On some architectures (EBSA110 and CATS), there is currently no way
 982           for the boot loader to pass arguments to the kernel. For these
 983           architectures, you should supply some command-line options at build
 984           time by entering them here. As a minimum, you should specify the
 985           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 986
 987 config XIP_KERNEL
 988         bool "Kernel Execute-In-Place from ROM"
 989         depends on !ZBOOT_ROM
 990         help
 991           Execute-In-Place allows the kernel to run from non-volatile storage
 992           directly addressable by the CPU, such as NOR flash. This saves RAM
 993           space since the text section of the kernel is not loaded from flash
 994           to RAM.  Read-write sections, such as the data section and stack,
 995           are still copied to RAM.  The XIP kernel is not compressed since
 996           it has to run directly from flash, so it will take more space to
 997           store it.  The flash address used to link the kernel object files,
 998           and for storing it, is configuration dependent. Therefore, if you
 999           say Y here, you must know the proper physical address where to
1000           store the kernel image depending on your own flash memory usage.
1001
1002           Also note that the make target becomes "make xipImage" rather than
1003           "make zImage" or "make Image".  The final kernel binary to put in
1004           ROM memory will be arch/arm/boot/xipImage.
1005
1006           If unsure, say N.
1007
1008 config XIP_PHYS_ADDR
1009         hex "XIP Kernel Physical Location"
1010         depends on XIP_KERNEL
1011         default "0x00080000"
1012         help
1013           This is the physical address in your flash memory the kernel will
1014           be linked for and stored to.  This address is dependent on your
1015           own flash usage.
1016
1017 config KEXEC
1018         bool "Kexec system call (EXPERIMENTAL)"
1019         depends on EXPERIMENTAL
1020         help
1021           kexec is a system call that implements the ability to shutdown your
1022           current kernel, and to start another kernel.  It is like a reboot
1023           but it is independent of the system firmware.   And like a reboot
1024           you can start any kernel with it, not just Linux.
1025
1026           It is an ongoing process to be certain the hardware in a machine
1027           is properly shutdown, so do not be surprised if this code does not
1028           initially work for you.  It may help to enable device hotplugging
1029           support.
1030
1031 config ATAGS_PROC
1032         bool "Export atags in procfs"
1033         depends on KEXEC
1034         default y
1035         help
1036           Should the atags used to boot the kernel be exported in an "atags"
1037           file in procfs. Useful with kexec.
1038
1039 endmenu
1040
1041 menu "CPU Power Management"
1042
1043 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1044
1045 source "drivers/cpufreq/Kconfig"
1046
1047 config CPU_FREQ_SA1100
1048         bool
1049         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1050         default y
1051
1052 config CPU_FREQ_SA1110
1053         bool
1054         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1055         default y
1056
1057 config CPU_FREQ_INTEGRATOR
1058         tristate "CPUfreq driver for ARM Integrator CPUs"
1059         depends on ARCH_INTEGRATOR && CPU_FREQ
1060         default y
1061         help
1062           This enables the CPUfreq driver for ARM Integrator CPUs.
1063
1064           For details, take a look at <file:Documentation/cpu-freq>.
1065
1066           If in doubt, say Y.
1067
1068 config CPU_FREQ_IMX
1069         tristate "CPUfreq driver for i.MX CPUs"
1070         depends on ARCH_IMX && CPU_FREQ
1071         default n
1072         help
1073           This enables the CPUfreq driver for i.MX CPUs.
1074
1075           If in doubt, say N.
1076
1077 config CPU_FREQ_PXA
1078         bool
1079         depends on CPU_FREQ && ARCH_PXA && PXA25x
1080         default y
1081         select CPU_FREQ_DEFAULT_GOV_USERSPACE
1082
1083 endif
1084
1085 source "drivers/cpuidle/Kconfig"
1086
1087 endmenu
1088
1089 menu "Floating point emulation"
1090
1091 comment "At least one emulation must be selected"
1092
1093 config FPE_NWFPE
1094         bool "NWFPE math emulation"
1095         depends on !AEABI || OABI_COMPAT
1096         ---help---
1097           Say Y to include the NWFPE floating point emulator in the kernel.
1098           This is necessary to run most binaries. Linux does not currently
1099           support floating point hardware so you need to say Y here even if
1100           your machine has an FPA or floating point co-processor podule.
1101
1102           You may say N here if you are going to load the Acorn FPEmulator
1103           early in the bootup.
1104
1105 config FPE_NWFPE_XP
1106         bool "Support extended precision"
1107         depends on FPE_NWFPE
1108         help
1109           Say Y to include 80-bit support in the kernel floating-point
1110           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
1111           Note that gcc does not generate 80-bit operations by default,
1112           so in most cases this option only enlarges the size of the
1113           floating point emulator without any good reason.
1114
1115           You almost surely want to say N here.
1116
1117 config FPE_FASTFPE
1118         bool "FastFPE math emulation (EXPERIMENTAL)"
1119         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1120         ---help---
1121           Say Y here to include the FAST floating point emulator in the kernel.
1122           This is an experimental much faster emulator which now also has full
1123           precision for the mantissa.  It does not support any exceptions.
1124           It is very simple, and approximately 3-6 times faster than NWFPE.
1125
1126           It should be sufficient for most programs.  It may be not suitable
1127           for scientific calculations, but you have to check this for yourself.
1128           If you do not feel you need a faster FP emulation you should better
1129           choose NWFPE.
1130
1131 config VFP
1132         bool "VFP-format floating point maths"
1133         depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1134         help
1135           Say Y to include VFP support code in the kernel. This is needed
1136           if your hardware includes a VFP unit.
1137
1138           Please see <file:Documentation/arm/VFP/release-notes.txt> for
1139           release notes and additional status information.
1140
1141           Say N if your target does not have VFP hardware.
1142
1143 config VFPv3
1144         bool
1145         depends on VFP
1146         default y if CPU_V7
1147
1148 config NEON
1149         bool "Advanced SIMD (NEON) Extension support"
1150         depends on VFPv3 && CPU_V7
1151         help
1152           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1153           Extension.
1154
1155 endmenu
1156
1157 menu "Userspace binary formats"
1158
1159 source "fs/Kconfig.binfmt"
1160
1161 config ARTHUR
1162         tristate "RISC OS personality"
1163         depends on !AEABI
1164         help
1165           Say Y here to include the kernel code necessary if you want to run
1166           Acorn RISC OS/Arthur binaries under Linux. This code is still very
1167           experimental; if this sounds frightening, say N and sleep in peace.
1168           You can also say M here to compile this support as a module (which
1169           will be called arthur).
1170
1171 endmenu
1172
1173 menu "Power management options"
1174
1175 source "kernel/power/Kconfig"
1176
1177 config ARCH_SUSPEND_POSSIBLE
1178         def_bool y
1179
1180 endmenu
1181
1182 source "net/Kconfig"
1183
1184 menu "Device Drivers"
1185
1186 source "drivers/base/Kconfig"
1187
1188 source "drivers/connector/Kconfig"
1189
1190 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1191 source "drivers/mtd/Kconfig"
1192 endif
1193
1194 source "drivers/parport/Kconfig"
1195
1196 source "drivers/pnp/Kconfig"
1197
1198 source "drivers/block/Kconfig"
1199
1200 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1201
1202 source "drivers/misc/Kconfig"
1203
1204 source "drivers/ide/Kconfig"
1205
1206 source "drivers/scsi/Kconfig"
1207
1208 source "drivers/ata/Kconfig"
1209
1210 source "drivers/md/Kconfig"
1211
1212 source "drivers/message/fusion/Kconfig"
1213
1214 source "drivers/ieee1394/Kconfig"
1215
1216 source "drivers/message/i2o/Kconfig"
1217
1218 source "drivers/net/Kconfig"
1219
1220 source "drivers/isdn/Kconfig"
1221
1222 # input before char - char/joystick depends on it. As does USB.
1223
1224 source "drivers/input/Kconfig"
1225
1226 source "drivers/char/Kconfig"
1227
1228 source "drivers/i2c/Kconfig"
1229
1230 source "drivers/spi/Kconfig"
1231
1232 source "drivers/gpio/Kconfig"
1233
1234 source "drivers/w1/Kconfig"
1235
1236 source "drivers/power/Kconfig"
1237
1238 source "drivers/hwmon/Kconfig"
1239
1240 source "drivers/thermal/Kconfig"
1241
1242 source "drivers/watchdog/Kconfig"
1243
1244 source "drivers/ssb/Kconfig"
1245
1246 #source "drivers/l3/Kconfig"
1247
1248 source "drivers/mfd/Kconfig"
1249
1250 source "drivers/media/Kconfig"
1251
1252 source "drivers/video/Kconfig"
1253
1254 source "sound/Kconfig"
1255
1256 source "drivers/hid/Kconfig"
1257
1258 source "drivers/usb/Kconfig"
1259
1260 source "drivers/uwb/Kconfig"
1261
1262 source "drivers/mmc/Kconfig"
1263
1264 source "drivers/memstick/Kconfig"
1265
1266 source "drivers/accessibility/Kconfig"
1267
1268 source "drivers/leds/Kconfig"
1269
1270 source "drivers/rtc/Kconfig"
1271
1272 source "drivers/dma/Kconfig"
1273
1274 source "drivers/dca/Kconfig"
1275
1276 source "drivers/auxdisplay/Kconfig"
1277
1278 source "drivers/regulator/Kconfig"
1279
1280 source "drivers/uio/Kconfig"
1281
1282 endmenu
1283
1284 source "fs/Kconfig"
1285
1286 source "arch/arm/Kconfig.debug"
1287
1288 source "security/Kconfig"
1289
1290 source "crypto/Kconfig"
1291
1292 source "lib/Kconfig"