arch/powerpc/Kconfig

   1 # For a description of the syntax of this configuration file,
   2 # see Documentation/kbuild/kconfig-language.txt.
   3 #
   4
   5 mainmenu "Linux/PowerPC Kernel Configuration"
   6
   7 source "arch/powerpc/platforms/Kconfig.cputype"
   8
   9 config PPC_PM_NEEDS_RTC_LIB
  10         bool
  11         select RTC_LIB
  12         default y if PM
  13
  14 config PPC32
  15         bool
  16         default y if !PPC64
  17
  18 config 64BIT
  19         bool
  20         default y if PPC64
  21
  22 config PPC_MERGE
  23         def_bool y
  24
  25 config MMU
  26         bool
  27         default y
  28
  29 config GENERIC_HARDIRQS
  30         bool
  31         default y
  32
  33 config IRQ_PER_CPU
  34         bool
  35         default y
  36
  37 config RWSEM_GENERIC_SPINLOCK
  38         bool
  39
  40 config RWSEM_XCHGADD_ALGORITHM
  41         bool
  42         default y
  43
  44 config ARCH_HAS_ILOG2_U32
  45         bool
  46         default y
  47
  48 config ARCH_HAS_ILOG2_U64
  49         bool
  50         default y if 64BIT
  51
  52 config GENERIC_HWEIGHT
  53         bool
  54         default y
  55
  56 config GENERIC_CALIBRATE_DELAY
  57         bool
  58         default y
  59
  60 config GENERIC_FIND_NEXT_BIT
  61         bool
  62         default y
  63
  64 config PPC
  65         bool
  66         default y
  67
  68 config EARLY_PRINTK
  69         bool
  70         default y
  71
  72 config COMPAT
  73         bool
  74         default y if PPC64
  75
  76 config SYSVIPC_COMPAT
  77         bool
  78         depends on COMPAT && SYSVIPC
  79         default y
  80
  81 # All PPC32s use generic nvram driver through ppc_md
  82 config GENERIC_NVRAM
  83         bool
  84         default y if PPC32
  85
  86 config SCHED_NO_NO_OMIT_FRAME_POINTER
  87         bool
  88         default y
  89
  90 config ARCH_MAY_HAVE_PC_FDC
  91         bool
  92         default !PPC_PSERIES || PCI
  93
  94 config PPC_OF
  95         def_bool y
  96
  97 config PPC_UDBG_16550
  98         bool
  99         default n
 100
 101 config GENERIC_TBSYNC
 102         bool
 103         default y if PPC32 && SMP
 104         default n
 105
 106 config AUDIT_ARCH
 107         bool
 108         default y
 109
 110 config GENERIC_BUG
 111         bool
 112         default y
 113         depends on BUG
 114
 115 config SYS_SUPPORTS_APM_EMULATION
 116         default y if PMAC_APM_EMU
 117         bool
 118
 119 config DEFAULT_UIMAGE
 120         bool
 121         help
 122           Used to allow a board to specify it wants a uImage built by default
 123         default n
 124
 125 config PPC64_SWSUSP
 126         bool
 127         depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
 128         default y
 129
 130 config PPC_DCR_NATIVE
 131         bool
 132         default n
 133
 134 config PPC_DCR_MMIO
 135         bool
 136         default n
 137
 138 config PPC_DCR
 139         bool
 140         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 141         default y
 142
 143 config PPC_OF_PLATFORM_PCI
 144         bool
 145         depends on PPC64 # not supported on 32 bits yet
 146         default n
 147
 148 source "init/Kconfig"
 149
 150 source "arch/powerpc/platforms/Kconfig"
 151
 152 menu "Kernel options"
 153
 154 config HIGHMEM
 155         bool "High memory support"
 156         depends on PPC32
 157
 158 source kernel/Kconfig.hz
 159 source kernel/Kconfig.preempt
 160 source "fs/Kconfig.binfmt"
 161
 162 # We optimistically allocate largepages from the VM, so make the limit
 163 # large enough (16MB). This badly named config option is actually
 164 # max order + 1
 165 config FORCE_MAX_ZONEORDER
 166         int
 167         depends on PPC64
 168         default "9" if PPC_64K_PAGES
 169         default "13"
 170
 171 config MATH_EMULATION
 172         bool "Math emulation"
 173         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 174         ---help---
 175           Some PowerPC chips designed for embedded applications do not have
 176           a floating-point unit and therefore do not implement the
 177           floating-point instructions in the PowerPC instruction set.  If you
 178           say Y here, the kernel will include code to emulate a floating-point
 179           unit, which will allow programs that use floating-point
 180           instructions to run.
 181
 182 config IOMMU_VMERGE
 183         bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
 184         depends on EXPERIMENTAL && PPC64
 185         default n
 186         help
 187           Cause IO segments sent to a device for DMA to be merged virtually
 188           by the IOMMU when they happen to have been allocated contiguously.
 189           This doesn't add pressure to the IOMMU allocator. However, some
 190           drivers don't support getting large merged segments coming back
 191           from *_map_sg(). Say Y if you know the drivers you are using are
 192           properly handling this case.
 193
 194 config HOTPLUG_CPU
 195         bool "Support for enabling/disabling CPUs"
 196         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 197         ---help---
 198           Say Y here to be able to disable and re-enable individual
 199           CPUs at runtime on SMP machines.
 200
 201           Say N if you are unsure.
 202
 203 config ARCH_ENABLE_MEMORY_HOTPLUG
 204         def_bool y
 205
 206 config KEXEC
 207         bool "kexec system call (EXPERIMENTAL)"
 208         depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
 209         help
 210           kexec is a system call that implements the ability to shutdown your
 211           current kernel, and to start another kernel.  It is like a reboot
 212           but it is independent of the system firmware.   And like a reboot
 213           you can start any kernel with it, not just Linux.
 214
 215           The name comes from the similarity to the exec system call.
 216
 217           It is an ongoing process to be certain the hardware in a machine
 218           is properly shutdown, so do not be surprised if this code does not
 219           initially work for you.  It may help to enable device hotplugging
 220           support.  As of this writing the exact hardware interface is
 221           strongly in flux, so no good recommendation can be made.
 222
 223 config CRASH_DUMP
 224         bool "Build a kdump crash kernel (EXPERIMENTAL)"
 225         depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
 226         help
 227           Build a kernel suitable for use as a kdump capture kernel.
 228           The kernel will be linked at a different address than normal, and
 229           so can only be used for Kdump.
 230
 231           Don't change this unless you know what you are doing.
 232
 233 config PPCBUG_NVRAM
 234         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 235         default y if PPC_PREP
 236
 237 config IRQ_ALL_CPUS
 238         bool "Distribute interrupts on all CPUs by default"
 239         depends on SMP && !MV64360
 240         help
 241           This option gives the kernel permission to distribute IRQs across
 242           multiple CPUs.  Saying N here will route all IRQs to the first
 243           CPU.  Generally saying Y is safe, although some problems have been
 244           reported with SMP Power Macintoshes with this option enabled.
 245
 246 config NUMA
 247         bool "NUMA support"
 248         depends on PPC64
 249         default y if SMP && PPC_PSERIES
 250
 251 config NODES_SHIFT
 252         int
 253         default "4"
 254         depends on NEED_MULTIPLE_NODES
 255
 256 config ARCH_SELECT_MEMORY_MODEL
 257         def_bool y
 258         depends on PPC64
 259
 260 config ARCH_FLATMEM_ENABLE
 261         def_bool y
 262         depends on (PPC64 && !NUMA) || PPC32
 263
 264 config ARCH_SPARSEMEM_ENABLE
 265         def_bool y
 266         depends on PPC64
 267
 268 config ARCH_SPARSEMEM_DEFAULT
 269         def_bool y
 270         depends on (SMP && PPC_PSERIES) || PPC_PS3
 271
 272 config ARCH_POPULATES_NODE_MAP
 273         def_bool y
 274
 275 source "mm/Kconfig"
 276
 277 config ARCH_MEMORY_PROBE
 278         def_bool y
 279         depends on MEMORY_HOTPLUG
 280
 281 # Some NUMA nodes have memory ranges that span
 282 # other nodes.  Even though a pfn is valid and
 283 # between a node's start and end pfns, it may not
 284 # reside on that node.  See memmap_init_zone()
 285 # for details.
 286 config NODES_SPAN_OTHER_NODES
 287         def_bool y
 288         depends on NEED_MULTIPLE_NODES
 289
 290 config PPC_HAS_HASH_64K
 291         bool
 292         depends on PPC64
 293         default n
 294
 295 config PPC_64K_PAGES
 296         bool "64k page size"
 297         depends on PPC64
 298         select PPC_HAS_HASH_64K
 299         help
 300           This option changes the kernel logical page size to 64k. On machines
 301           without processor support for 64k pages, the kernel will simulate
 302           them by loading each individual 4k page on demand transparently,
 303           while on hardware with such support, it will be used to map
 304           normal application pages.
 305
 306 config SCHED_SMT
 307         bool "SMT (Hyperthreading) scheduler support"
 308         depends on PPC64 && SMP
 309         help
 310           SMT scheduler support improves the CPU scheduler's decision making
 311           when dealing with POWER5 cpus at a cost of slightly increased
 312           overhead in some places. If unsure say N here.
 313
 314 config PROC_DEVICETREE
 315         bool "Support for device tree in /proc"
 316         depends on PROC_FS
 317         help
 318           This option adds a device-tree directory under /proc which contains
 319           an image of the device tree that the kernel copies from Open
 320           Firmware or other boot firmware. If unsure, say Y here.
 321
 322 config CMDLINE_BOOL
 323         bool "Default bootloader kernel arguments"
 324
 325 config CMDLINE
 326         string "Initial kernel command string"
 327         depends on CMDLINE_BOOL
 328         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 329         help
 330           On some platforms, there is currently no way for the boot loader to
 331           pass arguments to the kernel. For these platforms, you can supply
 332           some command-line options at build time by entering them here.  In
 333           most cases you will need to specify the root device here.
 334
 335 if !44x || BROKEN
 336 source kernel/power/Kconfig
 337 endif
 338
 339 config SECCOMP
 340         bool "Enable seccomp to safely compute untrusted bytecode"
 341         depends on PROC_FS
 342         default y
 343         help
 344           This kernel feature is useful for number crunching applications
 345           that may need to compute untrusted bytecode during their
 346           execution. By using pipes or other transports made available to
 347           the process as file descriptors supporting the read/write
 348           syscalls, it's possible to isolate those applications in
 349           their own address space using seccomp. Once seccomp is
 350           enabled via /proc/<pid>/seccomp, it cannot be disabled
 351           and the task is only allowed to execute a few safe syscalls
 352           defined by each seccomp mode.
 353
 354           If unsure, say Y. Only embedded should say N here.
 355
 356 config WANT_DEVICE_TREE
 357         bool
 358         default n
 359
 360 config DEVICE_TREE
 361         string "Static device tree source file"
 362         depends on WANT_DEVICE_TREE
 363         help
 364           This specifies the device tree source (.dts) file to be
 365           compiled and included when building the bootwrapper.  If a
 366           relative filename is given, then it will be relative to
 367           arch/powerpc/boot/dts.  If you are not using the bootwrapper,
 368           or do not need to build a dts into the bootwrapper, this
 369           field is ignored.
 370
 371           For example, this is required when building a cuImage target
 372           for an older U-Boot, which cannot pass a device tree itself.
 373           Such a kernel will not work with a newer U-Boot that tries to
 374           pass a device tree (unless you tell it not to).  If your U-Boot
 375           does not mention a device tree in "help bootm", then use the
 376           cuImage target and specify a device tree here.  Otherwise, use
 377           the uImage target and leave this field blank.
 378
 379 endmenu
 380
 381 config ISA_DMA_API
 382         bool
 383         default y
 384
 385 menu "Bus options"
 386
 387 config ISA
 388         bool "Support for ISA-bus hardware"
 389         depends on PPC_PREP || PPC_CHRP
 390         select PPC_I8259
 391         help
 392           Find out whether you have ISA slots on your motherboard.  ISA is the
 393           name of a bus system, i.e. the way the CPU talks to the other stuff
 394           inside your box.  If you have an Apple machine, say N here; if you
 395           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 396           you have an embedded board, consult your board documentation.
 397
 398 config ZONE_DMA
 399         bool
 400         default y
 401
 402 config GENERIC_ISA_DMA
 403         bool
 404         depends on PPC64 || POWER4 || 6xx && !CPM2
 405         default y
 406
 407 config PPC_INDIRECT_PCI
 408         bool
 409         depends on PCI
 410         default y if 40x || 44x
 411         default n
 412
 413 config PPC_INDIRECT_PCI_BE
 414         bool
 415         depends PPC_INDIRECT_PCI
 416         default n
 417
 418 config EISA
 419         bool
 420
 421 config SBUS
 422         bool
 423
 424 config FSL_SOC
 425         bool
 426
 427 config FSL_PCIE
 428         bool
 429         depends on PPC_86xx
 430
 431 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 432 config MCA
 433         bool
 434
 435 config PCI
 436         bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
 437                 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
 438                 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
 439         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 440                 && !PPC_85xx && !PPC_86xx
 441         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 442         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 443         select ARCH_SUPPORTS_MSI
 444         help
 445           Find out whether your system includes a PCI bus. PCI is the name of
 446           a bus system, i.e. the way the CPU talks to the other stuff inside
 447           your box.  If you say Y here, the kernel will include drivers and
 448           infrastructure code to support PCI bus devices.
 449
 450 config PCI_DOMAINS
 451         bool
 452         default PCI
 453
 454 config PCI_QSPAN
 455         bool "QSpan PCI"
 456         depends on !4xx && !CPM2 && 8xx
 457         select PPC_I8259
 458         help
 459           Say Y here if you have a system based on a Motorola 8xx-series
 460           embedded processor with a QSPAN PCI interface, otherwise say N.
 461
 462 config PCI_8260
 463         bool
 464         depends on PCI && 8260
 465         select PPC_INDIRECT_PCI
 466         default y
 467
 468 config 8260_PCI9
 469         bool "Enable workaround for MPC826x erratum PCI 9"
 470         depends on PCI_8260 && !ADS8272
 471         default y
 472
 473 choice
 474         prompt "IDMA channel for PCI 9 workaround"
 475         depends on 8260_PCI9
 476
 477 config 8260_PCI9_IDMA1
 478         bool "IDMA1"
 479
 480 config 8260_PCI9_IDMA2
 481         bool "IDMA2"
 482
 483 config 8260_PCI9_IDMA3
 484         bool "IDMA3"
 485
 486 config 8260_PCI9_IDMA4
 487         bool "IDMA4"
 488
 489 endchoice
 490
 491 source "drivers/pci/pcie/Kconfig"
 492
 493 source "drivers/pci/Kconfig"
 494
 495 source "drivers/pcmcia/Kconfig"
 496
 497 source "drivers/pci/hotplug/Kconfig"
 498
 499 endmenu
 500
 501 menu "Advanced setup"
 502         depends on PPC32
 503
 504 config ADVANCED_OPTIONS
 505         bool "Prompt for advanced kernel configuration options"
 506         help
 507           This option will enable prompting for a variety of advanced kernel
 508           configuration options.  These options can cause the kernel to not
 509           work if they are set incorrectly, but can be used to optimize certain
 510           aspects of kernel memory management.
 511
 512           Unless you know what you are doing, say N here.
 513
 514 comment "Default settings for advanced configuration options are used"
 515         depends on !ADVANCED_OPTIONS
 516
 517 config HIGHMEM_START_BOOL
 518         bool "Set high memory pool address"
 519         depends on ADVANCED_OPTIONS && HIGHMEM
 520         help
 521           This option allows you to set the base address of the kernel virtual
 522           area used to map high memory pages.  This can be useful in
 523           optimizing the layout of kernel virtual memory.
 524
 525           Say N here unless you know what you are doing.
 526
 527 config HIGHMEM_START
 528         hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
 529         default "0xfe000000"
 530
 531 config LOWMEM_SIZE_BOOL
 532         bool "Set maximum low memory"
 533         depends on ADVANCED_OPTIONS
 534         help
 535           This option allows you to set the maximum amount of memory which
 536           will be used as "low memory", that is, memory which the kernel can
 537           access directly, without having to set up a kernel virtual mapping.
 538           This can be useful in optimizing the layout of kernel virtual
 539           memory.
 540
 541           Say N here unless you know what you are doing.
 542
 543 config LOWMEM_SIZE
 544         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 545         default "0x30000000"
 546
 547 config KERNEL_START_BOOL
 548         bool "Set custom kernel base address"
 549         depends on ADVANCED_OPTIONS
 550         help
 551           This option allows you to set the kernel virtual address at which
 552           the kernel will map low memory (the kernel image will be linked at
 553           this address).  This can be useful in optimizing the virtual memory
 554           layout of the system.
 555
 556           Say N here unless you know what you are doing.
 557
 558 config KERNEL_START
 559         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 560         default "0xc0000000"
 561
 562 config TASK_SIZE_BOOL
 563         bool "Set custom user task size"
 564         depends on ADVANCED_OPTIONS
 565         help
 566           This option allows you to set the amount of virtual address space
 567           allocated to user tasks.  This can be useful in optimizing the
 568           virtual memory layout of the system.
 569
 570           Say N here unless you know what you are doing.
 571
 572 config TASK_SIZE
 573         hex "Size of user task space" if TASK_SIZE_BOOL
 574         default "0x80000000"
 575
 576 config CONSISTENT_START_BOOL
 577         bool "Set custom consistent memory pool address"
 578         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 579         help
 580           This option allows you to set the base virtual address
 581           of the consistent memory pool.  This pool of virtual
 582           memory is used to make consistent memory allocations.
 583
 584 config CONSISTENT_START
 585         hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
 586         default "0xff100000" if NOT_COHERENT_CACHE
 587
 588 config CONSISTENT_SIZE_BOOL
 589         bool "Set custom consistent memory pool size"
 590         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 591         help
 592           This option allows you to set the size of the
 593           consistent memory pool.  This pool of virtual memory
 594           is used to make consistent memory allocations.
 595
 596 config CONSISTENT_SIZE
 597         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 598         default "0x00200000" if NOT_COHERENT_CACHE
 599
 600 config BOOT_LOAD_BOOL
 601         bool "Set the boot link/load address"
 602         depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
 603         help
 604           This option allows you to set the initial load address of the zImage
 605           or zImage.initrd file.  This can be useful if you are on a board
 606           which has a small amount of memory.
 607
 608           Say N here unless you know what you are doing.
 609
 610 config BOOT_LOAD
 611         hex "Link/load address for booting" if BOOT_LOAD_BOOL
 612         default "0x00400000" if 40x || 8xx || 8260
 613         default "0x01000000" if 44x
 614         default "0x00800000"
 615
 616 config PIN_TLB
 617         bool "Pinned Kernel TLBs (860 ONLY)"
 618         depends on ADVANCED_OPTIONS && 8xx
 619 endmenu
 620
 621 if PPC64
 622 config KERNEL_START
 623         hex
 624         default "0xc000000000000000"
 625 endif
 626
 627 source "net/Kconfig"
 628
 629 source "drivers/Kconfig"
 630
 631 source "fs/Kconfig"
 632
 633 # XXX source "arch/ppc/8xx_io/Kconfig"
 634
 635 # XXX source "arch/ppc/8260_io/Kconfig"
 636
 637 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 638
 639 source "lib/Kconfig"
 640
 641 menu "Instrumentation Support"
 642         depends on EXPERIMENTAL
 643
 644 source "arch/powerpc/oprofile/Kconfig"
 645
 646 config KPROBES
 647         bool "Kprobes (EXPERIMENTAL)"
 648         depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
 649         help
 650           Kprobes allows you to trap at almost any kernel address and
 651           execute a callback function.  register_kprobe() establishes
 652           a probepoint and specifies the callback.  Kprobes is useful
 653           for kernel debugging, non-intrusive instrumentation and testing.
 654           If in doubt, say "N".
 655 endmenu
 656
 657 source "arch/powerpc/Kconfig.debug"
 658
 659 source "security/Kconfig"
 660
 661 config KEYS_COMPAT
 662         bool
 663         depends on COMPAT && KEYS
 664         default y
 665
 666 source "crypto/Kconfig"