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