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 HAVE_GPIO_LIB
 472         select GENERIC_TIME
 473         select GENERIC_CLOCKEVENTS
 474         help
 475           Support for TI's OMAP platform (OMAP1 and OMAP2).
 476
 477 config ARCH_MSM7X00A
 478         bool "Qualcomm MSM7X00A"
 479         select GENERIC_TIME
 480         select GENERIC_CLOCKEVENTS
 481         help
 482           Support for Qualcomm MSM7X00A based systems.  This runs on the ARM11
 483           apps processor of the MSM7X00A and depends on a shared memory
 484           interface to the ARM9 modem processor which runs the baseband stack
 485           and controls some vital subsystems (clock and power control, etc).
 486           <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
 487
 488 endchoice
 489
 490 source "arch/arm/mach-clps711x/Kconfig"
 491
 492 source "arch/arm/mach-ep93xx/Kconfig"
 493
 494 source "arch/arm/mach-footbridge/Kconfig"
 495
 496 source "arch/arm/mach-integrator/Kconfig"
 497
 498 source "arch/arm/mach-iop32x/Kconfig"
 499
 500 source "arch/arm/mach-iop33x/Kconfig"
 501
 502 source "arch/arm/mach-iop13xx/Kconfig"
 503
 504 source "arch/arm/mach-ixp4xx/Kconfig"
 505
 506 source "arch/arm/mach-ixp2000/Kconfig"
 507
 508 source "arch/arm/mach-ixp23xx/Kconfig"
 509
 510 source "arch/arm/mach-pxa/Kconfig"
 511
 512 source "arch/arm/mach-sa1100/Kconfig"
 513
 514 source "arch/arm/plat-omap/Kconfig"
 515
 516 source "arch/arm/mach-omap1/Kconfig"
 517
 518 source "arch/arm/mach-omap2/Kconfig"
 519
 520 source "arch/arm/mach-orion/Kconfig"
 521
 522 source "arch/arm/plat-s3c24xx/Kconfig"
 523 source "arch/arm/plat-s3c/Kconfig"
 524
 525 if ARCH_S3C2410
 526 source "arch/arm/mach-s3c2400/Kconfig"
 527 source "arch/arm/mach-s3c2410/Kconfig"
 528 source "arch/arm/mach-s3c2412/Kconfig"
 529 source "arch/arm/mach-s3c2440/Kconfig"
 530 source "arch/arm/mach-s3c2442/Kconfig"
 531 source "arch/arm/mach-s3c2443/Kconfig"
 532 endif
 533
 534 source "arch/arm/mach-lh7a40x/Kconfig"
 535
 536 source "arch/arm/mach-imx/Kconfig"
 537
 538 source "arch/arm/mach-h720x/Kconfig"
 539
 540 source "arch/arm/mach-versatile/Kconfig"
 541
 542 source "arch/arm/mach-aaec2000/Kconfig"
 543
 544 source "arch/arm/mach-realview/Kconfig"
 545
 546 source "arch/arm/mach-at91/Kconfig"
 547
 548 source "arch/arm/plat-mxc/Kconfig"
 549
 550 source "arch/arm/mach-netx/Kconfig"
 551
 552 source "arch/arm/mach-ns9xxx/Kconfig"
 553
 554 source "arch/arm/mach-davinci/Kconfig"
 555
 556 source "arch/arm/mach-ks8695/Kconfig"
 557
 558 source "arch/arm/mach-msm/Kconfig"
 559
 560 # Definitions to make life easier
 561 config ARCH_ACORN
 562         bool
 563
 564 config PLAT_IOP
 565         bool
 566
 567 source arch/arm/mm/Kconfig
 568
 569 config IWMMXT
 570         bool "Enable iWMMXt support"
 571         depends on CPU_XSCALE || CPU_XSC3
 572         default y if PXA27x || PXA3xx
 573         help
 574           Enable support for iWMMXt context switching at run time if
 575           running on a CPU that supports it.
 576
 577 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 578 config XSCALE_PMU
 579         bool
 580         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 581         default y
 582
 583 if !MMU
 584 source "arch/arm/Kconfig-nommu"
 585 endif
 586
 587 endmenu
 588
 589 source "arch/arm/common/Kconfig"
 590
 591 config FORCE_MAX_ZONEORDER
 592         int
 593         depends on SA1111
 594         default "9"
 595
 596 menu "Bus support"
 597
 598 config ARM_AMBA
 599         bool
 600
 601 config ISA
 602         bool
 603         help
 604           Find out whether you have ISA slots on your motherboard.  ISA is the
 605           name of a bus system, i.e. the way the CPU talks to the other stuff
 606           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 607           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 608           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 609
 610 # Select ISA DMA controller support
 611 config ISA_DMA
 612         bool
 613         select ISA_DMA_API
 614
 615 # Select ISA DMA interface
 616 config ISA_DMA_API
 617         bool
 618
 619 config PCI
 620         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
 621         help
 622           Find out whether you have a PCI motherboard. PCI is the name of a
 623           bus system, i.e. the way the CPU talks to the other stuff inside
 624           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 625           VESA. If you have PCI, say Y, otherwise N.
 626
 627 config PCI_SYSCALL
 628         def_bool PCI
 629
 630 # Select the host bridge type
 631 config PCI_HOST_VIA82C505
 632         bool
 633         depends on PCI && ARCH_SHARK
 634         default y
 635
 636 config PCI_HOST_ITE8152
 637         bool
 638         depends on PCI && MACH_ARMCORE
 639         default y
 640         select DMABOUNCE
 641
 642 source "drivers/pci/Kconfig"
 643
 644 source "drivers/pcmcia/Kconfig"
 645
 646 endmenu
 647
 648 menu "Kernel Features"
 649
 650 source "kernel/time/Kconfig"
 651
 652 config SMP
 653         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 654         depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
 655         help
 656           This enables support for systems with more than one CPU. If you have
 657           a system with only one CPU, like most personal computers, say N. If
 658           you have a system with more than one CPU, say Y.
 659
 660           If you say N here, the kernel will run on single and multiprocessor
 661           machines, but will use only one CPU of a multiprocessor machine. If
 662           you say Y here, the kernel will run on many, but not all, single
 663           processor machines. On a single processor machine, the kernel will
 664           run faster if you say N here.
 665
 666           See also <file:Documentation/i386/IO-APIC.txt>,
 667           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 668           <http://www.linuxdoc.org/docs.html#howto>.
 669
 670           If you don't know what to do here, say N.
 671
 672 config NR_CPUS
 673         int "Maximum number of CPUs (2-32)"
 674         range 2 32
 675         depends on SMP
 676         default "4"
 677
 678 config HOTPLUG_CPU
 679         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 680         depends on SMP && HOTPLUG && EXPERIMENTAL
 681         help
 682           Say Y here to experiment with turning CPUs off and on.  CPUs
 683           can be controlled through /sys/devices/system/cpu.
 684
 685 config LOCAL_TIMERS
 686         bool "Use local timer interrupts"
 687         depends on SMP && REALVIEW_EB_ARM11MP
 688         default y
 689         help
 690           Enable support for local timers on SMP platforms, rather then the
 691           legacy IPI broadcast method.  Local timers allows the system
 692           accounting to be spread across the timer interval, preventing a
 693           "thundering herd" at every timer tick.
 694
 695 config PREEMPT
 696         bool "Preemptible Kernel (EXPERIMENTAL)"
 697         depends on EXPERIMENTAL
 698         help
 699           This option reduces the latency of the kernel when reacting to
 700           real-time or interactive events by allowing a low priority process to
 701           be preempted even if it is in kernel mode executing a system call.
 702           This allows applications to run more reliably even when the system is
 703           under load.
 704
 705           Say Y here if you are building a kernel for a desktop, embedded
 706           or real-time system.  Say N if you are unsure.
 707
 708 config NO_IDLE_HZ
 709         bool "Dynamic tick timer"
 710         depends on !GENERIC_CLOCKEVENTS
 711         help
 712           Select this option if you want to disable continuous timer ticks
 713           and have them programmed to occur as required. This option saves
 714           power as the system can remain in idle state for longer.
 715
 716           By default dynamic tick is disabled during the boot, and can be
 717           manually enabled with:
 718
 719             echo 1 > /sys/devices/system/timer/timer0/dyn_tick
 720
 721           Alternatively, if you want dynamic tick automatically enabled
 722           during boot, pass "dyntick=enable" via the kernel command string.
 723
 724           Please note that dynamic tick may affect the accuracy of
 725           timekeeping on some platforms depending on the implementation.
 726           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
 727           to have accurate timekeeping with dynamic tick.
 728
 729 config HZ
 730         int
 731         default 128 if ARCH_L7200
 732         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 733         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 734         default AT91_TIMER_HZ if ARCH_AT91
 735         default 100
 736
 737 config AEABI
 738         bool "Use the ARM EABI to compile the kernel"
 739         help
 740           This option allows for the kernel to be compiled using the latest
 741           ARM ABI (aka EABI).  This is only useful if you are using a user
 742           space environment that is also compiled with EABI.
 743
 744           Since there are major incompatibilities between the legacy ABI and
 745           EABI, especially with regard to structure member alignment, this
 746           option also changes the kernel syscall calling convention to
 747           disambiguate both ABIs and allow for backward compatibility support
 748           (selected with CONFIG_OABI_COMPAT).
 749
 750           To use this you need GCC version 4.0.0 or later.
 751
 752 config OABI_COMPAT
 753         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 754         depends on AEABI && EXPERIMENTAL
 755         default y
 756         help
 757           This option preserves the old syscall interface along with the
 758           new (ARM EABI) one. It also provides a compatibility layer to
 759           intercept syscalls that have structure arguments which layout
 760           in memory differs between the legacy ABI and the new ARM EABI
 761           (only for non "thumb" binaries). This option adds a tiny
 762           overhead to all syscalls and produces a slightly larger kernel.
 763           If you know you'll be using only pure EABI user space then you
 764           can say N here. If this option is not selected and you attempt
 765           to execute a legacy ABI binary then the result will be
 766           UNPREDICTABLE (in fact it can be predicted that it won't work
 767           at all). If in doubt say Y.
 768
 769 config ARCH_DISCONTIGMEM_ENABLE
 770         bool
 771         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 772         help
 773           Say Y to support efficient handling of discontiguous physical memory,
 774           for architectures which are either NUMA (Non-Uniform Memory Access)
 775           or have huge holes in the physical address space for other reasons.
 776           See <file:Documentation/vm/numa> for more.
 777
 778 config NODES_SHIFT
 779         int
 780         default "4" if ARCH_LH7A40X
 781         default "2"
 782         depends on NEED_MULTIPLE_NODES
 783
 784 source "mm/Kconfig"
 785
 786 config LEDS
 787         bool "Timer and CPU usage LEDs"
 788         depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
 789                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 790                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 791                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 792                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 793                    ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
 794                    ARCH_KS8695 || MACH_RD88F5182
 795         help
 796           If you say Y here, the LEDs on your machine will be used
 797           to provide useful information about your current system status.
 798
 799           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 800           be able to select which LEDs are active using the options below. If
 801           you are compiling a kernel for the EBSA-110 or the LART however, the
 802           red LED will simply flash regularly to indicate that the system is
 803           still functional. It is safe to say Y here if you have a CATS
 804           system, but the driver will do nothing.
 805
 806 config LEDS_TIMER
 807         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 808                             OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 809                             || MACH_OMAP_PERSEUS2
 810         depends on LEDS
 811         depends on !GENERIC_CLOCKEVENTS
 812         default y if ARCH_EBSA110
 813         help
 814           If you say Y here, one of the system LEDs (the green one on the
 815           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 816           will flash regularly to indicate that the system is still
 817           operational. This is mainly useful to kernel hackers who are
 818           debugging unstable kernels.
 819
 820           The LART uses the same LED for both Timer LED and CPU usage LED
 821           functions. You may choose to use both, but the Timer LED function
 822           will overrule the CPU usage LED.
 823
 824 config LEDS_CPU
 825         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 826                         !ARCH_OMAP) \
 827                         || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 828                         || MACH_OMAP_PERSEUS2
 829         depends on LEDS
 830         help
 831           If you say Y here, the red LED will be used to give a good real
 832           time indication of CPU usage, by lighting whenever the idle task
 833           is not currently executing.
 834
 835           The LART uses the same LED for both Timer LED and CPU usage LED
 836           functions. You may choose to use both, but the Timer LED function
 837           will overrule the CPU usage LED.
 838
 839 config ALIGNMENT_TRAP
 840         bool
 841         depends on CPU_CP15_MMU
 842         default y if !ARCH_EBSA110
 843         help
 844           ARM processors cannot fetch/store information which is not
 845           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 846           address divisible by 4. On 32-bit ARM processors, these non-aligned
 847           fetch/store instructions will be emulated in software if you say
 848           here, which has a severe performance impact. This is necessary for
 849           correct operation of some network protocols. With an IP-only
 850           configuration it is safe to say N, otherwise say Y.
 851
 852 endmenu
 853
 854 menu "Boot options"
 855
 856 # Compressed boot loader in ROM.  Yes, we really want to ask about
 857 # TEXT and BSS so we preserve their values in the config files.
 858 config ZBOOT_ROM_TEXT
 859         hex "Compressed ROM boot loader base address"
 860         default "0"
 861         help
 862           The physical address at which the ROM-able zImage is to be
 863           placed in the target.  Platforms which normally make use of
 864           ROM-able zImage formats normally set this to a suitable
 865           value in their defconfig file.
 866
 867           If ZBOOT_ROM is not enabled, this has no effect.
 868
 869 config ZBOOT_ROM_BSS
 870         hex "Compressed ROM boot loader BSS address"
 871         default "0"
 872         help
 873           The base address of an area of read/write memory in the target
 874           for the ROM-able zImage which must be available while the
 875           decompressor is running. It must be large enough to hold the
 876           entire decompressed kernel plus an additional 128 KiB.
 877           Platforms which normally make use of ROM-able zImage formats
 878           normally set this to a suitable value in their defconfig file.
 879
 880           If ZBOOT_ROM is not enabled, this has no effect.
 881
 882 config ZBOOT_ROM
 883         bool "Compressed boot loader in ROM/flash"
 884         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 885         help
 886           Say Y here if you intend to execute your compressed kernel image
 887           (zImage) directly from ROM or flash.  If unsure, say N.
 888
 889 config CMDLINE
 890         string "Default kernel command string"
 891         default ""
 892         help
 893           On some architectures (EBSA110 and CATS), there is currently no way
 894           for the boot loader to pass arguments to the kernel. For these
 895           architectures, you should supply some command-line options at build
 896           time by entering them here. As a minimum, you should specify the
 897           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 898
 899 config XIP_KERNEL
 900         bool "Kernel Execute-In-Place from ROM"
 901         depends on !ZBOOT_ROM
 902         help
 903           Execute-In-Place allows the kernel to run from non-volatile storage
 904           directly addressable by the CPU, such as NOR flash. This saves RAM
 905           space since the text section of the kernel is not loaded from flash
 906           to RAM.  Read-write sections, such as the data section and stack,
 907           are still copied to RAM.  The XIP kernel is not compressed since
 908           it has to run directly from flash, so it will take more space to
 909           store it.  The flash address used to link the kernel object files,
 910           and for storing it, is configuration dependent. Therefore, if you
 911           say Y here, you must know the proper physical address where to
 912           store the kernel image depending on your own flash memory usage.
 913
 914           Also note that the make target becomes "make xipImage" rather than
 915           "make zImage" or "make Image".  The final kernel binary to put in
 916           ROM memory will be arch/arm/boot/xipImage.
 917
 918           If unsure, say N.
 919
 920 config XIP_PHYS_ADDR
 921         hex "XIP Kernel Physical Location"
 922         depends on XIP_KERNEL
 923         default "0x00080000"
 924         help
 925           This is the physical address in your flash memory the kernel will
 926           be linked for and stored to.  This address is dependent on your
 927           own flash usage.
 928
 929 config KEXEC
 930         bool "Kexec system call (EXPERIMENTAL)"
 931         depends on EXPERIMENTAL
 932         help
 933           kexec is a system call that implements the ability to shutdown your
 934           current kernel, and to start another kernel.  It is like a reboot
 935           but it is independent of the system firmware.   And like a reboot
 936           you can start any kernel with it, not just Linux.
 937
 938           It is an ongoing process to be certain the hardware in a machine
 939           is properly shutdown, so do not be surprised if this code does not
 940           initially work for you.  It may help to enable device hotplugging
 941           support.
 942
 943 config ATAGS_PROC
 944         bool "Export atags in procfs"
 945         depends on KEXEC
 946         default y
 947         help
 948           Should the atags used to boot the kernel be exported in an "atags"
 949           file in procfs. Useful with kexec.
 950
 951 endmenu
 952
 953 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
 954
 955 menu "CPU Frequency scaling"
 956
 957 source "drivers/cpufreq/Kconfig"
 958
 959 config CPU_FREQ_SA1100
 960         bool
 961         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 962         default y
 963
 964 config CPU_FREQ_SA1110
 965         bool
 966         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 967         default y
 968
 969 config CPU_FREQ_INTEGRATOR
 970         tristate "CPUfreq driver for ARM Integrator CPUs"
 971         depends on ARCH_INTEGRATOR && CPU_FREQ
 972         default y
 973         help
 974           This enables the CPUfreq driver for ARM Integrator CPUs.
 975
 976           For details, take a look at <file:Documentation/cpu-freq>.
 977
 978           If in doubt, say Y.
 979
 980 config CPU_FREQ_IMX
 981         tristate "CPUfreq driver for i.MX CPUs"
 982         depends on ARCH_IMX && CPU_FREQ
 983         default n
 984         help
 985           This enables the CPUfreq driver for i.MX CPUs.
 986
 987           If in doubt, say N.
 988
 989 config CPU_FREQ_PXA
 990         bool
 991         depends on CPU_FREQ && ARCH_PXA && PXA25x
 992         default y
 993         select CPU_FREQ_DEFAULT_GOV_USERSPACE
 994
 995 endmenu
 996
 997 endif
 998
 999 menu "Floating point emulation"
1000
1001 comment "At least one emulation must be selected"
1002
1003 config FPE_NWFPE
1004         bool "NWFPE math emulation"
1005         depends on !AEABI || OABI_COMPAT
1006         ---help---
1007           Say Y to include the NWFPE floating point emulator in the kernel.
1008           This is necessary to run most binaries. Linux does not currently
1009           support floating point hardware so you need to say Y here even if
1010           your machine has an FPA or floating point co-processor podule.
1011
1012           You may say N here if you are going to load the Acorn FPEmulator
1013           early in the bootup.
1014
1015 config FPE_NWFPE_XP
1016         bool "Support extended precision"
1017         depends on FPE_NWFPE
1018         help
1019           Say Y to include 80-bit support in the kernel floating-point
1020           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
1021           Note that gcc does not generate 80-bit operations by default,
1022           so in most cases this option only enlarges the size of the
1023           floating point emulator without any good reason.
1024
1025           You almost surely want to say N here.
1026
1027 config FPE_FASTFPE
1028         bool "FastFPE math emulation (EXPERIMENTAL)"
1029         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1030         ---help---
1031           Say Y here to include the FAST floating point emulator in the kernel.
1032           This is an experimental much faster emulator which now also has full
1033           precision for the mantissa.  It does not support any exceptions.
1034           It is very simple, and approximately 3-6 times faster than NWFPE.
1035
1036           It should be sufficient for most programs.  It may be not suitable
1037           for scientific calculations, but you have to check this for yourself.
1038           If you do not feel you need a faster FP emulation you should better
1039           choose NWFPE.
1040
1041 config VFP
1042         bool "VFP-format floating point maths"
1043         depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1044         help
1045           Say Y to include VFP support code in the kernel. This is needed
1046           if your hardware includes a VFP unit.
1047
1048           Please see <file:Documentation/arm/VFP/release-notes.txt> for
1049           release notes and additional status information.
1050
1051           Say N if your target does not have VFP hardware.
1052
1053 config VFPv3
1054         bool
1055         depends on VFP
1056         default y if CPU_V7
1057
1058 config NEON
1059         bool "Advanced SIMD (NEON) Extension support"
1060         depends on VFPv3 && CPU_V7
1061         help
1062           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1063           Extension.
1064
1065 endmenu
1066
1067 menu "Userspace binary formats"
1068
1069 source "fs/Kconfig.binfmt"
1070
1071 config ARTHUR
1072         tristate "RISC OS personality"
1073         depends on !AEABI
1074         help
1075           Say Y here to include the kernel code necessary if you want to run
1076           Acorn RISC OS/Arthur binaries under Linux. This code is still very
1077           experimental; if this sounds frightening, say N and sleep in peace.
1078           You can also say M here to compile this support as a module (which
1079           will be called arthur).
1080
1081 endmenu
1082
1083 menu "Power management options"
1084
1085 source "kernel/power/Kconfig"
1086
1087 config ARCH_SUSPEND_POSSIBLE
1088         def_bool y
1089
1090 endmenu
1091
1092 source "net/Kconfig"
1093
1094 menu "Device Drivers"
1095
1096 source "drivers/base/Kconfig"
1097
1098 source "drivers/connector/Kconfig"
1099
1100 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1101 source "drivers/mtd/Kconfig"
1102 endif
1103
1104 source "drivers/parport/Kconfig"
1105
1106 source "drivers/pnp/Kconfig"
1107
1108 source "drivers/block/Kconfig"
1109
1110 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1111
1112 source "drivers/misc/Kconfig"
1113
1114 source "drivers/ide/Kconfig"
1115
1116 source "drivers/scsi/Kconfig"
1117
1118 source "drivers/ata/Kconfig"
1119
1120 source "drivers/md/Kconfig"
1121
1122 source "drivers/message/fusion/Kconfig"
1123
1124 source "drivers/ieee1394/Kconfig"
1125
1126 source "drivers/message/i2o/Kconfig"
1127
1128 source "drivers/net/Kconfig"
1129
1130 source "drivers/isdn/Kconfig"
1131
1132 # input before char - char/joystick depends on it. As does USB.
1133
1134 source "drivers/input/Kconfig"
1135
1136 source "drivers/char/Kconfig"
1137
1138 source "drivers/i2c/Kconfig"
1139
1140 source "drivers/spi/Kconfig"
1141
1142 source "drivers/gpio/Kconfig"
1143
1144 source "drivers/w1/Kconfig"
1145
1146 source "drivers/power/Kconfig"
1147
1148 source "drivers/hwmon/Kconfig"
1149
1150 source "drivers/watchdog/Kconfig"
1151
1152 source "drivers/ssb/Kconfig"
1153
1154 #source "drivers/l3/Kconfig"
1155
1156 source "drivers/mfd/Kconfig"
1157
1158 source "drivers/media/Kconfig"
1159
1160 source "drivers/video/Kconfig"
1161
1162 source "sound/Kconfig"
1163
1164 source "drivers/hid/Kconfig"
1165
1166 source "drivers/usb/Kconfig"
1167
1168 source "drivers/mmc/Kconfig"
1169
1170 source "drivers/leds/Kconfig"
1171
1172 source "drivers/rtc/Kconfig"
1173
1174 source "drivers/dma/Kconfig"
1175
1176 source "drivers/dca/Kconfig"
1177
1178 endmenu
1179
1180 source "fs/Kconfig"
1181
1182 source "arch/arm/Kconfig.debug"
1183
1184 source "security/Kconfig"
1185
1186 source "crypto/Kconfig"
1187
1188 source "lib/Kconfig"