arch/sh/Kconfig

   1 config SUPERH
   2         def_bool y
   3         select EXPERT
   4         select CLKDEV_LOOKUP
   5         select HAVE_IDE if HAS_IOPORT
   6         select HAVE_MEMBLOCK
   7         select HAVE_OPROFILE
   8         select HAVE_GENERIC_DMA_COHERENT
   9         select HAVE_ARCH_TRACEHOOK
  10         select HAVE_DMA_API_DEBUG
  11         select HAVE_DMA_ATTRS
  12         select HAVE_IRQ_WORK
  13         select HAVE_PERF_EVENTS
  14         select PERF_USE_VMALLOC
  15         select HAVE_KERNEL_GZIP
  16         select HAVE_KERNEL_BZIP2
  17         select HAVE_KERNEL_LZMA
  18         select HAVE_KERNEL_XZ
  19         select HAVE_KERNEL_LZO
  20         select HAVE_SYSCALL_TRACEPOINTS
  21         select HAVE_REGS_AND_STACK_ACCESS_API
  22         select HAVE_GENERIC_HARDIRQS
  23         select HAVE_SPARSE_IRQ
  24         select RTC_LIB
  25         select GENERIC_ATOMIC64
  26         # Support the deprecated APIs until MFD and GPIOLIB catch up.
  27         select GENERIC_HARDIRQS_NO_DEPRECATED if !MFD_SUPPORT && !GPIOLIB
  28         select GENERIC_IRQ_SHOW
  29         help
  30           The SuperH is a RISC processor targeted for use in embedded systems
  31           and consumer electronics; it was also used in the Sega Dreamcast
  32           gaming console.  The SuperH port has a home page at
  33           <http://www.linux-sh.org/>.
  34
  35 config SUPERH32
  36         def_bool ARCH = "sh"
  37         select HAVE_KPROBES
  38         select HAVE_KRETPROBES
  39         select HAVE_IOREMAP_PROT if MMU && !X2TLB
  40         select HAVE_FUNCTION_TRACER
  41         select HAVE_FTRACE_MCOUNT_RECORD
  42         select HAVE_DYNAMIC_FTRACE
  43         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  44         select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
  45         select HAVE_FUNCTION_GRAPH_TRACER
  46         select HAVE_ARCH_KGDB
  47         select HAVE_HW_BREAKPOINT
  48         select HAVE_MIXED_BREAKPOINTS_REGS
  49         select PERF_EVENTS
  50         select ARCH_HIBERNATION_POSSIBLE if MMU
  51         select SPARSE_IRQ
  52
  53 config SUPERH64
  54         def_bool ARCH = "sh64"
  55
  56 config ARCH_DEFCONFIG
  57         string
  58         default "arch/sh/configs/shx3_defconfig" if SUPERH32
  59         default "arch/sh/configs/cayman_defconfig" if SUPERH64
  60
  61 config RWSEM_GENERIC_SPINLOCK
  62         def_bool y
  63
  64 config RWSEM_XCHGADD_ALGORITHM
  65         bool
  66
  67 config GENERIC_BUG
  68         def_bool y
  69         depends on BUG && SUPERH32
  70
  71 config GENERIC_CSUM
  72         def_bool y
  73         depends on SUPERH64
  74
  75 config GENERIC_FIND_NEXT_BIT
  76         def_bool y
  77
  78 config GENERIC_FIND_BIT_LE
  79         def_bool y
  80
  81 config GENERIC_HWEIGHT
  82         def_bool y
  83
  84 config IRQ_PER_CPU
  85         def_bool y
  86
  87 config GENERIC_GPIO
  88         def_bool n
  89
  90 config GENERIC_CALIBRATE_DELAY
  91         bool
  92
  93 config GENERIC_IOMAP
  94         bool
  95
  96 config GENERIC_CLOCKEVENTS
  97         def_bool y
  98
  99 config GENERIC_CLOCKEVENTS_BROADCAST
 100         bool
 101
 102 config GENERIC_CMOS_UPDATE
 103         def_bool y
 104         depends on SH_SH03 || SH_DREAMCAST
 105
 106 config GENERIC_LOCKBREAK
 107         def_bool y
 108         depends on SMP && PREEMPT
 109
 110 config SYS_SUPPORTS_PM
 111         bool
 112         depends on !SMP
 113
 114 config ARCH_SUSPEND_POSSIBLE
 115         def_bool n
 116
 117 config ARCH_HIBERNATION_POSSIBLE
 118         def_bool n
 119
 120 config SYS_SUPPORTS_APM_EMULATION
 121         bool
 122         select ARCH_SUSPEND_POSSIBLE
 123
 124 config SYS_SUPPORTS_HUGETLBFS
 125         bool
 126
 127 config SYS_SUPPORTS_SMP
 128         bool
 129
 130 config SYS_SUPPORTS_NUMA
 131         bool
 132
 133 config SYS_SUPPORTS_PCI
 134         bool
 135
 136 config SYS_SUPPORTS_CMT
 137         bool
 138
 139 config SYS_SUPPORTS_MTU2
 140         bool
 141
 142 config SYS_SUPPORTS_TMU
 143         bool
 144
 145 config STACKTRACE_SUPPORT
 146         def_bool y
 147
 148 config LOCKDEP_SUPPORT
 149         def_bool y
 150
 151 config HAVE_LATENCYTOP_SUPPORT
 152         def_bool y
 153
 154 config ARCH_HAS_ILOG2_U32
 155         def_bool n
 156
 157 config ARCH_HAS_ILOG2_U64
 158         def_bool n
 159
 160 config ARCH_NO_VIRT_TO_BUS
 161         def_bool y
 162
 163 config ARCH_HAS_DEFAULT_IDLE
 164         def_bool y
 165
 166 config ARCH_HAS_CPU_IDLE_WAIT
 167         def_bool y
 168
 169 config NO_IOPORT
 170         def_bool !PCI
 171         depends on !SH_CAYMAN && !SH_SH4202_MICRODEV
 172
 173 config IO_TRAPPED
 174         bool
 175
 176 config DMA_COHERENT
 177         bool
 178
 179 config DMA_NONCOHERENT
 180         def_bool !DMA_COHERENT
 181
 182 config NEED_DMA_MAP_STATE
 183         def_bool DMA_NONCOHERENT
 184
 185 config NEED_SG_DMA_LENGTH
 186         def_bool y
 187
 188 source "init/Kconfig"
 189
 190 source "kernel/Kconfig.freezer"
 191
 192 menu "System type"
 193
 194 #
 195 # Processor families
 196 #
 197 config CPU_SH2
 198         bool
 199
 200 config CPU_SH2A
 201         bool
 202         select CPU_SH2
 203         select UNCACHED_MAPPING
 204
 205 config CPU_SH3
 206         bool
 207         select CPU_HAS_INTEVT
 208         select CPU_HAS_SR_RB
 209         select SYS_SUPPORTS_TMU
 210
 211 config CPU_SH4
 212         bool
 213         select CPU_HAS_INTEVT
 214         select CPU_HAS_SR_RB
 215         select CPU_HAS_FPU if !CPU_SH4AL_DSP
 216         select SYS_SUPPORTS_TMU
 217         select SYS_SUPPORTS_HUGETLBFS if MMU
 218
 219 config CPU_SH4A
 220         bool
 221         select CPU_SH4
 222
 223 config CPU_SH4AL_DSP
 224         bool
 225         select CPU_SH4A
 226         select CPU_HAS_DSP
 227
 228 config CPU_SH5
 229         bool
 230         select CPU_HAS_FPU
 231         select SYS_SUPPORTS_TMU
 232         select SYS_SUPPORTS_HUGETLBFS if MMU
 233
 234 config CPU_SHX2
 235         bool
 236
 237 config CPU_SHX3
 238         bool
 239         select DMA_COHERENT
 240         select SYS_SUPPORTS_SMP
 241         select SYS_SUPPORTS_NUMA
 242
 243 config ARCH_SHMOBILE
 244         bool
 245         select ARCH_SUSPEND_POSSIBLE
 246         select PM
 247         select PM_RUNTIME
 248
 249 config CPU_HAS_PMU
 250        depends on CPU_SH4 || CPU_SH4A
 251        default y
 252        bool
 253
 254 if SUPERH32
 255
 256 choice
 257         prompt "Processor sub-type selection"
 258
 259 #
 260 # Processor subtypes
 261 #
 262
 263 # SH-2 Processor Support
 264
 265 config CPU_SUBTYPE_SH7619
 266         bool "Support SH7619 processor"
 267         select CPU_SH2
 268         select SYS_SUPPORTS_CMT
 269
 270 # SH-2A Processor Support
 271
 272 config CPU_SUBTYPE_SH7201
 273         bool "Support SH7201 processor"
 274         select CPU_SH2A
 275         select CPU_HAS_FPU
 276         select SYS_SUPPORTS_MTU2
 277
 278 config CPU_SUBTYPE_SH7203
 279         bool "Support SH7203 processor"
 280         select CPU_SH2A
 281         select CPU_HAS_FPU
 282         select SYS_SUPPORTS_CMT
 283         select SYS_SUPPORTS_MTU2
 284         select ARCH_WANT_OPTIONAL_GPIOLIB
 285
 286 config CPU_SUBTYPE_SH7206
 287         bool "Support SH7206 processor"
 288         select CPU_SH2A
 289         select SYS_SUPPORTS_CMT
 290         select SYS_SUPPORTS_MTU2
 291
 292 config CPU_SUBTYPE_SH7263
 293         bool "Support SH7263 processor"
 294         select CPU_SH2A
 295         select CPU_HAS_FPU
 296         select SYS_SUPPORTS_CMT
 297         select SYS_SUPPORTS_MTU2
 298
 299 config CPU_SUBTYPE_MXG
 300         bool "Support MX-G processor"
 301         select CPU_SH2A
 302         select SYS_SUPPORTS_MTU2
 303         help
 304           Select MX-G if running on an R8A03022BG part.
 305
 306 # SH-3 Processor Support
 307
 308 config CPU_SUBTYPE_SH7705
 309         bool "Support SH7705 processor"
 310         select CPU_SH3
 311
 312 config CPU_SUBTYPE_SH7706
 313         bool "Support SH7706 processor"
 314         select CPU_SH3
 315         help
 316           Select SH7706 if you have a 133 Mhz SH-3 HD6417706 CPU.
 317
 318 config CPU_SUBTYPE_SH7707
 319         bool "Support SH7707 processor"
 320         select CPU_SH3
 321         help
 322           Select SH7707 if you have a  60 Mhz SH-3 HD6417707 CPU.
 323
 324 config CPU_SUBTYPE_SH7708
 325         bool "Support SH7708 processor"
 326         select CPU_SH3
 327         help
 328           Select SH7708 if you have a  60 Mhz SH-3 HD6417708S or
 329           if you have a 100 Mhz SH-3 HD6417708R CPU.
 330
 331 config CPU_SUBTYPE_SH7709
 332         bool "Support SH7709 processor"
 333         select CPU_SH3
 334         help
 335           Select SH7709 if you have a  80 Mhz SH-3 HD6417709 CPU.
 336
 337 config CPU_SUBTYPE_SH7710
 338         bool "Support SH7710 processor"
 339         select CPU_SH3
 340         select CPU_HAS_DSP
 341         help
 342           Select SH7710 if you have a SH3-DSP SH7710 CPU.
 343
 344 config CPU_SUBTYPE_SH7712
 345         bool "Support SH7712 processor"
 346         select CPU_SH3
 347         select CPU_HAS_DSP
 348         help
 349           Select SH7712 if you have a SH3-DSP SH7712 CPU.
 350
 351 config CPU_SUBTYPE_SH7720
 352         bool "Support SH7720 processor"
 353         select CPU_SH3
 354         select CPU_HAS_DSP
 355         select SYS_SUPPORTS_CMT
 356         select ARCH_WANT_OPTIONAL_GPIOLIB
 357         select USB_ARCH_HAS_OHCI
 358         help
 359           Select SH7720 if you have a SH3-DSP SH7720 CPU.
 360
 361 config CPU_SUBTYPE_SH7721
 362         bool "Support SH7721 processor"
 363         select CPU_SH3
 364         select CPU_HAS_DSP
 365         select SYS_SUPPORTS_CMT
 366         select USB_ARCH_HAS_OHCI
 367         help
 368           Select SH7721 if you have a SH3-DSP SH7721 CPU.
 369
 370 # SH-4 Processor Support
 371
 372 config CPU_SUBTYPE_SH7750
 373         bool "Support SH7750 processor"
 374         select CPU_SH4
 375         help
 376           Select SH7750 if you have a 200 Mhz SH-4 HD6417750 CPU.
 377
 378 config CPU_SUBTYPE_SH7091
 379         bool "Support SH7091 processor"
 380         select CPU_SH4
 381         help
 382           Select SH7091 if you have an SH-4 based Sega device (such as
 383           the Dreamcast, Naomi, and Naomi 2).
 384
 385 config CPU_SUBTYPE_SH7750R
 386         bool "Support SH7750R processor"
 387         select CPU_SH4
 388
 389 config CPU_SUBTYPE_SH7750S
 390         bool "Support SH7750S processor"
 391         select CPU_SH4
 392
 393 config CPU_SUBTYPE_SH7751
 394         bool "Support SH7751 processor"
 395         select CPU_SH4
 396         help
 397           Select SH7751 if you have a 166 Mhz SH-4 HD6417751 CPU,
 398           or if you have a HD6417751R CPU.
 399
 400 config CPU_SUBTYPE_SH7751R
 401         bool "Support SH7751R processor"
 402         select CPU_SH4
 403
 404 config CPU_SUBTYPE_SH7760
 405         bool "Support SH7760 processor"
 406         select CPU_SH4
 407
 408 config CPU_SUBTYPE_SH4_202
 409         bool "Support SH4-202 processor"
 410         select CPU_SH4
 411
 412 # SH-4A Processor Support
 413
 414 config CPU_SUBTYPE_SH7723
 415         bool "Support SH7723 processor"
 416         select CPU_SH4A
 417         select CPU_SHX2
 418         select ARCH_SHMOBILE
 419         select ARCH_SPARSEMEM_ENABLE
 420         select SYS_SUPPORTS_CMT
 421         select ARCH_WANT_OPTIONAL_GPIOLIB
 422         help
 423           Select SH7723 if you have an SH-MobileR2 CPU.
 424
 425 config CPU_SUBTYPE_SH7724
 426         bool "Support SH7724 processor"
 427         select CPU_SH4A
 428         select CPU_SHX2
 429         select ARCH_SHMOBILE
 430         select ARCH_SPARSEMEM_ENABLE
 431         select SYS_SUPPORTS_CMT
 432         select ARCH_WANT_OPTIONAL_GPIOLIB
 433         help
 434           Select SH7724 if you have an SH-MobileR2R CPU.
 435
 436 config CPU_SUBTYPE_SH7757
 437         bool "Support SH7757 processor"
 438         select CPU_SH4A
 439         select CPU_SHX2
 440         select ARCH_WANT_OPTIONAL_GPIOLIB
 441         select USB_ARCH_HAS_OHCI
 442         select USB_ARCH_HAS_EHCI
 443         help
 444           Select SH7757 if you have a SH4A SH7757 CPU.
 445
 446 config CPU_SUBTYPE_SH7763
 447         bool "Support SH7763 processor"
 448         select CPU_SH4A
 449         select USB_ARCH_HAS_OHCI
 450         help
 451           Select SH7763 if you have a SH4A SH7763(R5S77631) CPU.
 452
 453 config CPU_SUBTYPE_SH7770
 454         bool "Support SH7770 processor"
 455         select CPU_SH4A
 456
 457 config CPU_SUBTYPE_SH7780
 458         bool "Support SH7780 processor"
 459         select CPU_SH4A
 460
 461 config CPU_SUBTYPE_SH7785
 462         bool "Support SH7785 processor"
 463         select CPU_SH4A
 464         select CPU_SHX2
 465         select ARCH_SPARSEMEM_ENABLE
 466         select SYS_SUPPORTS_NUMA
 467         select ARCH_WANT_OPTIONAL_GPIOLIB
 468
 469 config CPU_SUBTYPE_SH7786
 470         bool "Support SH7786 processor"
 471         select CPU_SH4A
 472         select CPU_SHX3
 473         select CPU_HAS_PTEAEX
 474         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 475         select ARCH_WANT_OPTIONAL_GPIOLIB
 476         select USB_ARCH_HAS_OHCI
 477         select USB_ARCH_HAS_EHCI
 478
 479 config CPU_SUBTYPE_SHX3
 480         bool "Support SH-X3 processor"
 481         select CPU_SH4A
 482         select CPU_SHX3
 483         select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 484         select ARCH_REQUIRE_GPIOLIB
 485
 486 # SH4AL-DSP Processor Support
 487
 488 config CPU_SUBTYPE_SH7343
 489         bool "Support SH7343 processor"
 490         select CPU_SH4AL_DSP
 491         select ARCH_SHMOBILE
 492         select SYS_SUPPORTS_CMT
 493
 494 config CPU_SUBTYPE_SH7722
 495         bool "Support SH7722 processor"
 496         select CPU_SH4AL_DSP
 497         select CPU_SHX2
 498         select ARCH_SHMOBILE
 499         select ARCH_SPARSEMEM_ENABLE
 500         select SYS_SUPPORTS_NUMA
 501         select SYS_SUPPORTS_CMT
 502         select ARCH_WANT_OPTIONAL_GPIOLIB
 503
 504 config CPU_SUBTYPE_SH7366
 505         bool "Support SH7366 processor"
 506         select CPU_SH4AL_DSP
 507         select CPU_SHX2
 508         select ARCH_SHMOBILE
 509         select ARCH_SPARSEMEM_ENABLE
 510         select SYS_SUPPORTS_NUMA
 511         select SYS_SUPPORTS_CMT
 512
 513 endchoice
 514
 515 endif
 516
 517 if SUPERH64
 518
 519 choice
 520         prompt "Processor sub-type selection"
 521
 522 # SH-5 Processor Support
 523
 524 config CPU_SUBTYPE_SH5_101
 525         bool "Support SH5-101 processor"
 526         select CPU_SH5
 527
 528 config CPU_SUBTYPE_SH5_103
 529         bool "Support SH5-103 processor"
 530         select CPU_SH5
 531
 532 endchoice
 533
 534 endif
 535
 536 source "arch/sh/mm/Kconfig"
 537
 538 source "arch/sh/Kconfig.cpu"
 539
 540 source "arch/sh/boards/Kconfig"
 541
 542 menu "Timer and clock configuration"
 543
 544 config SH_TIMER_TMU
 545         bool "TMU timer driver"
 546         depends on SYS_SUPPORTS_TMU
 547         default y
 548         help
 549           This enables the build of the TMU timer driver.
 550
 551 config SH_TIMER_CMT
 552         bool "CMT timer driver"
 553         depends on SYS_SUPPORTS_CMT
 554         default y
 555         help
 556           This enables build of the CMT timer driver.
 557
 558 config SH_TIMER_MTU2
 559         bool "MTU2 timer driver"
 560         depends on SYS_SUPPORTS_MTU2
 561         default y
 562         help
 563           This enables build of the MTU2 timer driver.
 564
 565 config SH_PCLK_FREQ
 566         int "Peripheral clock frequency (in Hz)"
 567         depends on SH_CLK_CPG_LEGACY
 568         default "31250000" if CPU_SUBTYPE_SH7619
 569         default "33333333" if CPU_SUBTYPE_SH7770 || \
 570                               CPU_SUBTYPE_SH7760 || \
 571                               CPU_SUBTYPE_SH7705 || \
 572                               CPU_SUBTYPE_SH7203 || \
 573                               CPU_SUBTYPE_SH7206 || \
 574                               CPU_SUBTYPE_SH7263 || \
 575                               CPU_SUBTYPE_MXG
 576         default "60000000" if CPU_SUBTYPE_SH7751 || CPU_SUBTYPE_SH7751R
 577         default "66000000" if CPU_SUBTYPE_SH4_202
 578         default "50000000"
 579         help
 580           This option is used to specify the peripheral clock frequency.
 581           This is necessary for determining the reference clock value on
 582           platforms lacking an RTC.
 583
 584 config SH_CLK_CPG
 585         def_bool y
 586
 587 config SH_CLK_CPG_LEGACY
 588         depends on SH_CLK_CPG
 589         def_bool y if !CPU_SUBTYPE_SH7785 && !ARCH_SHMOBILE && \
 590                       !CPU_SHX3 && !CPU_SUBTYPE_SH7757
 591
 592 source "kernel/time/Kconfig"
 593
 594 endmenu
 595
 596 menu "CPU Frequency scaling"
 597
 598 source "drivers/cpufreq/Kconfig"
 599
 600 config SH_CPU_FREQ
 601         tristate "SuperH CPU Frequency driver"
 602         depends on CPU_FREQ
 603         select CPU_FREQ_TABLE
 604         help
 605           This adds the cpufreq driver for SuperH. Any CPU that supports
 606           clock rate rounding through the clock framework can use this
 607           driver. While it will make the kernel slightly larger, this is
 608           harmless for CPUs that don't support rate rounding. The driver
 609           will also generate a notice in the boot log before disabling
 610           itself if the CPU in question is not capable of rate rounding.
 611
 612           For details, take a look at <file:Documentation/cpu-freq>.
 613
 614           If unsure, say N.
 615
 616 endmenu
 617
 618 source "arch/sh/drivers/Kconfig"
 619
 620 endmenu
 621
 622 menu "Kernel features"
 623
 624 source kernel/Kconfig.hz
 625
 626 config KEXEC
 627         bool "kexec system call (EXPERIMENTAL)"
 628         depends on SUPERH32 && EXPERIMENTAL && MMU
 629         help
 630           kexec is a system call that implements the ability to shutdown your
 631           current kernel, and to start another kernel.  It is like a reboot
 632           but it is independent of the system firmware.  And like a reboot
 633           you can start any kernel with it, not just Linux.
 634
 635           The name comes from the similarity to the exec system call.
 636
 637           It is an ongoing process to be certain the hardware in a machine
 638           is properly shutdown, so do not be surprised if this code does not
 639           initially work for you.  It may help to enable device hotplugging
 640           support.  As of this writing the exact hardware interface is
 641           strongly in flux, so no good recommendation can be made.
 642
 643 config CRASH_DUMP
 644         bool "kernel crash dumps (EXPERIMENTAL)"
 645         depends on SUPERH32 && EXPERIMENTAL && BROKEN_ON_SMP
 646         help
 647           Generate crash dump after being started by kexec.
 648           This should be normally only set in special crash dump kernels
 649           which are loaded in the main kernel with kexec-tools into
 650           a specially reserved region and then later executed after
 651           a crash by kdump/kexec. The crash dump kernel must be compiled
 652           to a memory address not used by the main kernel using
 653           MEMORY_START.
 654
 655           For more details see Documentation/kdump/kdump.txt
 656
 657 config KEXEC_JUMP
 658         bool "kexec jump (EXPERIMENTAL)"
 659         depends on SUPERH32 && KEXEC && HIBERNATION && EXPERIMENTAL
 660         help
 661           Jump between original kernel and kexeced kernel and invoke
 662           code via KEXEC
 663
 664 config SECCOMP
 665         bool "Enable seccomp to safely compute untrusted bytecode"
 666         depends on PROC_FS
 667         help
 668           This kernel feature is useful for number crunching applications
 669           that may need to compute untrusted bytecode during their
 670           execution. By using pipes or other transports made available to
 671           the process as file descriptors supporting the read/write
 672           syscalls, it's possible to isolate those applications in
 673           their own address space using seccomp. Once seccomp is
 674           enabled via prctl, it cannot be disabled and the task is only
 675           allowed to execute a few safe syscalls defined by each seccomp
 676           mode.
 677
 678           If unsure, say N.
 679
 680 config SMP
 681         bool "Symmetric multi-processing support"
 682         depends on SYS_SUPPORTS_SMP
 683         select USE_GENERIC_SMP_HELPERS
 684         ---help---
 685           This enables support for systems with more than one CPU. If you have
 686           a system with only one CPU, like most personal computers, say N. If
 687           you have a system with more than one CPU, say Y.
 688
 689           If you say N here, the kernel will run on single and multiprocessor
 690           machines, but will use only one CPU of a multiprocessor machine. If
 691           you say Y here, the kernel will run on many, but not all,
 692           singleprocessor machines. On a singleprocessor machine, the kernel
 693           will run faster if you say N here.
 694
 695           People using multiprocessor machines who say Y here should also say
 696           Y to "Enhanced Real Time Clock Support", below.
 697
 698           See also <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO
 699           available at <http://www.tldp.org/docs.html#howto>.
 700
 701           If you don't know what to do here, say N.
 702
 703 config NR_CPUS
 704         int "Maximum number of CPUs (2-32)"
 705         range 2 32
 706         depends on SMP
 707         default "4" if CPU_SUBTYPE_SHX3
 708         default "2"
 709         help
 710           This allows you to specify the maximum number of CPUs which this
 711           kernel will support.  The maximum supported value is 32 and the
 712           minimum value which makes sense is 2.
 713
 714           This is purely to save memory - each supported CPU adds
 715           approximately eight kilobytes to the kernel image.
 716
 717 config HOTPLUG_CPU
 718         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 719         depends on SMP && HOTPLUG && EXPERIMENTAL
 720         help
 721           Say Y here to experiment with turning CPUs off and on.  CPUs
 722           can be controlled through /sys/devices/system/cpu.
 723
 724 source "kernel/Kconfig.preempt"
 725
 726 config GUSA
 727         def_bool y
 728         depends on !SMP && SUPERH32
 729         help
 730           This enables support for gUSA (general UserSpace Atomicity).
 731           This is the default implementation for both UP and non-ll/sc
 732           CPUs, and is used by the libc, amongst others.
 733
 734           For additional information, design information can be found
 735           in <http://lc.linux.or.jp/lc2002/papers/niibe0919p.pdf>.
 736
 737           This should only be disabled for special cases where alternate
 738           atomicity implementations exist.
 739
 740 config GUSA_RB
 741         bool "Implement atomic operations by roll-back (gRB) (EXPERIMENTAL)"
 742         depends on GUSA && CPU_SH3 || (CPU_SH4 && !CPU_SH4A)
 743         help
 744           Enabling this option will allow the kernel to implement some
 745           atomic operations using a software implementation of load-locked/
 746           store-conditional (LLSC). On machines which do not have hardware
 747           LLSC, this should be more efficient than the other alternative of
 748           disabling interrupts around the atomic sequence.
 749
 750 config HW_PERF_EVENTS
 751         bool "Enable hardware performance counter support for perf events"
 752         depends on PERF_EVENTS && CPU_HAS_PMU
 753         default y
 754         help
 755           Enable hardware performance counter support for perf events. If
 756           disabled, perf events will use software events only.
 757
 758 source "drivers/sh/Kconfig"
 759
 760 endmenu
 761
 762 menu "Boot options"
 763
 764 config ZERO_PAGE_OFFSET
 765         hex
 766         default "0x00010000" if PAGE_SIZE_64KB || SH_RTS7751R2D || \
 767                                 SH_7751_SOLUTION_ENGINE
 768         default "0x00004000" if PAGE_SIZE_16KB || SH_SH03
 769         default "0x00002000" if PAGE_SIZE_8KB
 770         default "0x00001000"
 771         help
 772           This sets the default offset of zero page.
 773
 774 config BOOT_LINK_OFFSET
 775         hex
 776         default "0x00210000" if SH_SHMIN
 777         default "0x00400000" if SH_CAYMAN
 778         default "0x00810000" if SH_7780_SOLUTION_ENGINE
 779         default "0x009e0000" if SH_TITAN
 780         default "0x01800000" if SH_SDK7780
 781         default "0x02000000" if SH_EDOSK7760
 782         default "0x00800000"
 783         help
 784           This option allows you to set the link address offset of the zImage.
 785           This can be useful if you are on a board which has a small amount of
 786           memory.
 787
 788 config ENTRY_OFFSET
 789         hex
 790         default "0x00001000" if PAGE_SIZE_4KB
 791         default "0x00002000" if PAGE_SIZE_8KB
 792         default "0x00004000" if PAGE_SIZE_16KB
 793         default "0x00010000" if PAGE_SIZE_64KB
 794         default "0x00000000"
 795
 796 config ROMIMAGE_MMCIF
 797         bool "Include MMCIF loader in romImage (EXPERIMENTAL)"
 798         depends on CPU_SUBTYPE_SH7724 && EXPERIMENTAL
 799         help
 800           Say Y here to include experimental MMCIF loading code in
 801           romImage. With this enabled it is possible to write the romImage
 802           kernel image to an MMC card and boot the kernel straight from
 803           the reset vector. At reset the processor Mask ROM will load the
 804           first part of the romImage which in turn loads the rest the kernel
 805           image to RAM using the MMCIF hardware block.
 806
 807 choice
 808         prompt "Kernel command line"
 809         optional
 810         default CMDLINE_OVERWRITE
 811         help
 812           Setting this option allows the kernel command line arguments
 813           to be set.
 814
 815 config CMDLINE_OVERWRITE
 816         bool "Overwrite bootloader kernel arguments"
 817         help
 818           Given string will overwrite any arguments passed in by
 819           a bootloader.
 820
 821 config CMDLINE_EXTEND
 822         bool "Extend bootloader kernel arguments"
 823         help
 824           Given string will be concatenated with arguments passed in
 825           by a bootloader.
 826
 827 endchoice
 828
 829 config CMDLINE
 830         string "Kernel command line arguments string"
 831         depends on CMDLINE_OVERWRITE || CMDLINE_EXTEND
 832         default "console=ttySC1,115200"
 833
 834 endmenu
 835
 836 menu "Bus options"
 837
 838 config SUPERHYWAY
 839         tristate "SuperHyway Bus support"
 840         depends on CPU_SUBTYPE_SH4_202
 841
 842 config MAPLE
 843         bool "Maple Bus support"
 844         depends on SH_DREAMCAST
 845         help
 846          The Maple Bus is SEGA's serial communication bus for peripherals
 847          on the Dreamcast. Without this bus support you won't be able to
 848          get your Dreamcast keyboard etc to work, so most users
 849          probably want to say 'Y' here, unless you are only using the
 850          Dreamcast with a serial line terminal or a remote network
 851          connection.
 852
 853 config PCI
 854         bool "PCI support"
 855         depends on SYS_SUPPORTS_PCI
 856         select PCI_DOMAINS
 857         help
 858           Find out whether you have a PCI motherboard. PCI is the name of a
 859           bus system, i.e. the way the CPU talks to the other stuff inside
 860           your box. If you have PCI, say Y, otherwise N.
 861
 862 config PCI_DOMAINS
 863         bool
 864
 865 source "drivers/pci/pcie/Kconfig"
 866
 867 source "drivers/pci/Kconfig"
 868
 869 source "drivers/pcmcia/Kconfig"
 870
 871 source "drivers/pci/hotplug/Kconfig"
 872
 873 endmenu
 874
 875 menu "Executable file formats"
 876
 877 source "fs/Kconfig.binfmt"
 878
 879 endmenu
 880
 881 menu "Power management options (EXPERIMENTAL)"
 882 depends on EXPERIMENTAL
 883
 884 source "kernel/power/Kconfig"
 885
 886 source "drivers/cpuidle/Kconfig"
 887
 888 endmenu
 889
 890 source "net/Kconfig"
 891
 892 source "drivers/Kconfig"
 893
 894 source "fs/Kconfig"
 895
 896 source "arch/sh/Kconfig.debug"
 897
 898 source "security/Kconfig"
 899
 900 source "crypto/Kconfig"
 901
 902 menuconfig VIRTUALIZATION
 903         bool "Virtualization"
 904         default n
 905         ---help---
 906           Say Y here to get to see options for using your Linux host to run other
 907           operating systems inside virtual machines (guests).
 908           This option alone does not add any kernel code.
 909
 910           If you say N, all options in this submenu will be skipped and disabled.
 911
 912 if VIRTUALIZATION
 913
 914 source drivers/virtio/Kconfig
 915
 916 endif # VIRTUALIZATION
 917
 918 source "lib/Kconfig"