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 PPC32
  10         bool
  11         default y if !PPC64
  12
  13 config 64BIT
  14         bool
  15         default y if PPC64
  16
  17 config WORD_SIZE
  18         int
  19         default 64 if PPC64
  20         default 32 if !PPC64
  21
  22 config PPC_MERGE
  23         def_bool y
  24
  25 config MMU
  26         bool
  27         default y
  28
  29 config GENERIC_CMOS_UPDATE
  30         def_bool y
  31
  32 config GENERIC_TIME
  33         def_bool y
  34
  35 config GENERIC_TIME_VSYSCALL
  36         def_bool y
  37
  38 config GENERIC_CLOCKEVENTS
  39         def_bool y
  40
  41 config GENERIC_HARDIRQS
  42         bool
  43         default y
  44
  45 config ARCH_SETS_UP_PER_CPU_AREA
  46         def_bool PPC64
  47
  48 config IRQ_PER_CPU
  49         bool
  50         default y
  51
  52 config RWSEM_GENERIC_SPINLOCK
  53         bool
  54
  55 config RWSEM_XCHGADD_ALGORITHM
  56         bool
  57         default y
  58
  59 config GENERIC_LOCKBREAK
  60         bool
  61         default y
  62         depends on SMP && PREEMPT
  63
  64 config ARCH_HAS_ILOG2_U32
  65         bool
  66         default y
  67
  68 config ARCH_HAS_ILOG2_U64
  69         bool
  70         default y if 64BIT
  71
  72 config GENERIC_HWEIGHT
  73         bool
  74         default y
  75
  76 config GENERIC_CALIBRATE_DELAY
  77         bool
  78         default y
  79
  80 config GENERIC_FIND_NEXT_BIT
  81         bool
  82         default y
  83
  84 config ARCH_NO_VIRT_TO_BUS
  85         def_bool PPC64
  86
  87 config PPC
  88         bool
  89         default y
  90
  91 config EARLY_PRINTK
  92         bool
  93         default y
  94
  95 config COMPAT
  96         bool
  97         default y if PPC64
  98
  99 config SYSVIPC_COMPAT
 100         bool
 101         depends on COMPAT && SYSVIPC
 102         default y
 103
 104 # All PPC32s use generic nvram driver through ppc_md
 105 config GENERIC_NVRAM
 106         bool
 107         default y if PPC32
 108
 109 config SCHED_NO_NO_OMIT_FRAME_POINTER
 110         bool
 111         default y
 112
 113 config ARCH_MAY_HAVE_PC_FDC
 114         bool
 115         default !PPC_PSERIES || PCI
 116
 117 config PPC_OF
 118         def_bool y
 119
 120 config OF
 121         def_bool y
 122
 123 config PPC_UDBG_16550
 124         bool
 125         default n
 126
 127 config GENERIC_TBSYNC
 128         bool
 129         default y if PPC32 && SMP
 130         default n
 131
 132 config AUDIT_ARCH
 133         bool
 134         default y
 135
 136 config GENERIC_BUG
 137         bool
 138         default y
 139         depends on BUG
 140
 141 config SYS_SUPPORTS_APM_EMULATION
 142         default y if PMAC_APM_EMU
 143         bool
 144
 145 config DEFAULT_UIMAGE
 146         bool
 147         help
 148           Used to allow a board to specify it wants a uImage built by default
 149         default n
 150
 151 config PPC64_SWSUSP
 152         bool
 153         depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
 154         default y
 155
 156 config PPC_DCR_NATIVE
 157         bool
 158         default n
 159
 160 config PPC_DCR_MMIO
 161         bool
 162         default n
 163
 164 config PPC_DCR
 165         bool
 166         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 167         default y
 168
 169 config PPC_OF_PLATFORM_PCI
 170         bool
 171         depends on PPC64 # not supported on 32 bits yet
 172         default n
 173
 174 source "init/Kconfig"
 175
 176 source "arch/powerpc/platforms/Kconfig"
 177
 178 menu "Kernel options"
 179
 180 config HIGHMEM
 181         bool "High memory support"
 182         depends on PPC32
 183
 184 source kernel/time/Kconfig
 185 source kernel/Kconfig.hz
 186 source kernel/Kconfig.preempt
 187 source "fs/Kconfig.binfmt"
 188
 189 # We optimistically allocate largepages from the VM, so make the limit
 190 # large enough (16MB). This badly named config option is actually
 191 # max order + 1
 192 config FORCE_MAX_ZONEORDER
 193         int
 194         depends on PPC64
 195         default "9" if PPC_64K_PAGES
 196         default "13"
 197
 198 config HUGETLB_PAGE_SIZE_VARIABLE
 199         bool
 200         depends on HUGETLB_PAGE
 201         default y
 202
 203 config MATH_EMULATION
 204         bool "Math emulation"
 205         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 206         ---help---
 207           Some PowerPC chips designed for embedded applications do not have
 208           a floating-point unit and therefore do not implement the
 209           floating-point instructions in the PowerPC instruction set.  If you
 210           say Y here, the kernel will include code to emulate a floating-point
 211           unit, which will allow programs that use floating-point
 212           instructions to run.
 213
 214 config 8XX_MINIMAL_FPEMU
 215         bool "Minimal math emulation for 8xx"
 216         depends on 8xx && !MATH_EMULATION
 217         help
 218           Older arch/ppc kernels still emulated a few floating point
 219           instructions such as load and store, even when full math
 220           emulation is disabled.  Say "Y" here if you want to preserve
 221           this behavior.
 222
 223           It is recommended that you build a soft-float userspace instead.
 224
 225 config IOMMU_VMERGE
 226         bool "Enable IOMMU virtual merging"
 227         depends on PPC64
 228         default y
 229         help
 230           Cause IO segments sent to a device for DMA to be merged virtually
 231           by the IOMMU when they happen to have been allocated contiguously.
 232           This doesn't add pressure to the IOMMU allocator. However, some
 233           drivers don't support getting large merged segments coming back
 234           from *_map_sg().
 235
 236           Most drivers don't have this problem; it is safe to say Y here.
 237
 238 config HOTPLUG_CPU
 239         bool "Support for enabling/disabling CPUs"
 240         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 241         ---help---
 242           Say Y here to be able to disable and re-enable individual
 243           CPUs at runtime on SMP machines.
 244
 245           Say N if you are unsure.
 246
 247 config ARCH_ENABLE_MEMORY_HOTPLUG
 248         def_bool y
 249
 250 config KEXEC
 251         bool "kexec system call (EXPERIMENTAL)"
 252         depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
 253         help
 254           kexec is a system call that implements the ability to shutdown your
 255           current kernel, and to start another kernel.  It is like a reboot
 256           but it is independent of the system firmware.   And like a reboot
 257           you can start any kernel with it, not just Linux.
 258
 259           The name comes from the similarity to the exec system call.
 260
 261           It is an ongoing process to be certain the hardware in a machine
 262           is properly shutdown, so do not be surprised if this code does not
 263           initially work for you.  It may help to enable device hotplugging
 264           support.  As of this writing the exact hardware interface is
 265           strongly in flux, so no good recommendation can be made.
 266
 267 config CRASH_DUMP
 268         bool "Build a kdump crash kernel (EXPERIMENTAL)"
 269         depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
 270         help
 271           Build a kernel suitable for use as a kdump capture kernel.
 272           The kernel will be linked at a different address than normal, and
 273           so can only be used for Kdump.
 274
 275           Don't change this unless you know what you are doing.
 276
 277 config PPCBUG_NVRAM
 278         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 279         default y if PPC_PREP
 280
 281 config IRQ_ALL_CPUS
 282         bool "Distribute interrupts on all CPUs by default"
 283         depends on SMP && !MV64360
 284         help
 285           This option gives the kernel permission to distribute IRQs across
 286           multiple CPUs.  Saying N here will route all IRQs to the first
 287           CPU.  Generally saying Y is safe, although some problems have been
 288           reported with SMP Power Macintoshes with this option enabled.
 289
 290 config NUMA
 291         bool "NUMA support"
 292         depends on PPC64
 293         default y if SMP && PPC_PSERIES
 294
 295 config NODES_SHIFT
 296         int
 297         default "4"
 298         depends on NEED_MULTIPLE_NODES
 299
 300 config ARCH_SELECT_MEMORY_MODEL
 301         def_bool y
 302         depends on PPC64
 303
 304 config ARCH_FLATMEM_ENABLE
 305         def_bool y
 306         depends on (PPC64 && !NUMA) || PPC32
 307
 308 config ARCH_SPARSEMEM_ENABLE
 309         def_bool y
 310         depends on PPC64
 311         select SPARSEMEM_VMEMMAP_ENABLE
 312
 313 config ARCH_SPARSEMEM_DEFAULT
 314         def_bool y
 315         depends on (SMP && PPC_PSERIES) || PPC_PS3
 316
 317 config ARCH_POPULATES_NODE_MAP
 318         def_bool y
 319
 320 source "mm/Kconfig"
 321
 322 config ARCH_MEMORY_PROBE
 323         def_bool y
 324         depends on MEMORY_HOTPLUG
 325
 326 # Some NUMA nodes have memory ranges that span
 327 # other nodes.  Even though a pfn is valid and
 328 # between a node's start and end pfns, it may not
 329 # reside on that node.  See memmap_init_zone()
 330 # for details.
 331 config NODES_SPAN_OTHER_NODES
 332         def_bool y
 333         depends on NEED_MULTIPLE_NODES
 334
 335 config PPC_HAS_HASH_64K
 336         bool
 337         depends on PPC64
 338         default n
 339
 340 config PPC_64K_PAGES
 341         bool "64k page size"
 342         depends on PPC64
 343         select PPC_HAS_HASH_64K
 344         help
 345           This option changes the kernel logical page size to 64k. On machines
 346           without processor support for 64k pages, the kernel will simulate
 347           them by loading each individual 4k page on demand transparently,
 348           while on hardware with such support, it will be used to map
 349           normal application pages.
 350
 351 config SCHED_SMT
 352         bool "SMT (Hyperthreading) scheduler support"
 353         depends on PPC64 && SMP
 354         help
 355           SMT scheduler support improves the CPU scheduler's decision making
 356           when dealing with POWER5 cpus at a cost of slightly increased
 357           overhead in some places. If unsure say N here.
 358
 359 config PROC_DEVICETREE
 360         bool "Support for device tree in /proc"
 361         depends on PROC_FS
 362         help
 363           This option adds a device-tree directory under /proc which contains
 364           an image of the device tree that the kernel copies from Open
 365           Firmware or other boot firmware. If unsure, say Y here.
 366
 367 config CMDLINE_BOOL
 368         bool "Default bootloader kernel arguments"
 369
 370 config CMDLINE
 371         string "Initial kernel command string"
 372         depends on CMDLINE_BOOL
 373         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 374         help
 375           On some platforms, there is currently no way for the boot loader to
 376           pass arguments to the kernel. For these platforms, you can supply
 377           some command-line options at build time by entering them here.  In
 378           most cases you will need to specify the root device here.
 379
 380 if !44x || BROKEN
 381 source kernel/power/Kconfig
 382 endif
 383
 384 config SECCOMP
 385         bool "Enable seccomp to safely compute untrusted bytecode"
 386         depends on PROC_FS
 387         default y
 388         help
 389           This kernel feature is useful for number crunching applications
 390           that may need to compute untrusted bytecode during their
 391           execution. By using pipes or other transports made available to
 392           the process as file descriptors supporting the read/write
 393           syscalls, it's possible to isolate those applications in
 394           their own address space using seccomp. Once seccomp is
 395           enabled via /proc/<pid>/seccomp, it cannot be disabled
 396           and the task is only allowed to execute a few safe syscalls
 397           defined by each seccomp mode.
 398
 399           If unsure, say Y. Only embedded should say N here.
 400
 401 config WANT_DEVICE_TREE
 402         bool
 403         default n
 404
 405 config DEVICE_TREE
 406         string "Static device tree source file"
 407         depends on WANT_DEVICE_TREE
 408         help
 409           This specifies the device tree source (.dts) file to be
 410           compiled and included when building the bootwrapper.  If a
 411           relative filename is given, then it will be relative to
 412           arch/powerpc/boot/dts.  If you are not using the bootwrapper,
 413           or do not need to build a dts into the bootwrapper, this
 414           field is ignored.
 415
 416           For example, this is required when building a cuImage target
 417           for an older U-Boot, which cannot pass a device tree itself.
 418           Such a kernel will not work with a newer U-Boot that tries to
 419           pass a device tree (unless you tell it not to).  If your U-Boot
 420           does not mention a device tree in "help bootm", then use the
 421           cuImage target and specify a device tree here.  Otherwise, use
 422           the uImage target and leave this field blank.
 423
 424 endmenu
 425
 426 config ISA_DMA_API
 427         bool
 428         default y
 429
 430 menu "Bus options"
 431
 432 config ISA
 433         bool "Support for ISA-bus hardware"
 434         depends on PPC_PREP || PPC_CHRP
 435         select PPC_I8259
 436         help
 437           Find out whether you have ISA slots on your motherboard.  ISA is the
 438           name of a bus system, i.e. the way the CPU talks to the other stuff
 439           inside your box.  If you have an Apple machine, say N here; if you
 440           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 441           you have an embedded board, consult your board documentation.
 442
 443 config ZONE_DMA
 444         bool
 445         default y
 446
 447 config GENERIC_ISA_DMA
 448         bool
 449         depends on PPC64 || POWER4 || 6xx && !CPM2
 450         default y
 451
 452 config PPC_INDIRECT_PCI
 453         bool
 454         depends on PCI
 455         default y if 40x || 44x
 456         default n
 457
 458 config EISA
 459         bool
 460
 461 config SBUS
 462         bool
 463
 464 config FSL_SOC
 465         bool
 466
 467 config FSL_PCI
 468         bool
 469         select PPC_INDIRECT_PCI
 470
 471 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 472 config MCA
 473         bool
 474
 475 config PCI
 476         bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
 477                 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
 478                 || PPC_PS3
 479         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 480                 && !PPC_85xx && !PPC_86xx
 481         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 482         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 483         select ARCH_SUPPORTS_MSI
 484         help
 485           Find out whether your system includes a PCI bus. PCI is the name of
 486           a bus system, i.e. the way the CPU talks to the other stuff inside
 487           your box.  If you say Y here, the kernel will include drivers and
 488           infrastructure code to support PCI bus devices.
 489
 490 config PCI_DOMAINS
 491         def_bool PCI
 492
 493 config PCI_SYSCALL
 494         def_bool PCI
 495
 496 config PCI_QSPAN
 497         bool "QSpan PCI"
 498         depends on !4xx && !CPM2 && 8xx
 499         select PPC_I8259
 500         help
 501           Say Y here if you have a system based on a Motorola 8xx-series
 502           embedded processor with a QSPAN PCI interface, otherwise say N.
 503
 504 config PCI_8260
 505         bool
 506         depends on PCI && 8260
 507         select PPC_INDIRECT_PCI
 508         default y
 509
 510 config 8260_PCI9
 511         bool "Enable workaround for MPC826x erratum PCI 9"
 512         depends on PCI_8260 && !8272
 513         default y
 514
 515 choice
 516         prompt "IDMA channel for PCI 9 workaround"
 517         depends on 8260_PCI9
 518
 519 config 8260_PCI9_IDMA1
 520         bool "IDMA1"
 521
 522 config 8260_PCI9_IDMA2
 523         bool "IDMA2"
 524
 525 config 8260_PCI9_IDMA3
 526         bool "IDMA3"
 527
 528 config 8260_PCI9_IDMA4
 529         bool "IDMA4"
 530
 531 endchoice
 532
 533 source "drivers/pci/pcie/Kconfig"
 534
 535 source "drivers/pci/Kconfig"
 536
 537 source "drivers/pcmcia/Kconfig"
 538
 539 source "drivers/pci/hotplug/Kconfig"
 540
 541 endmenu
 542
 543 menu "Advanced setup"
 544         depends on PPC32
 545
 546 config ADVANCED_OPTIONS
 547         bool "Prompt for advanced kernel configuration options"
 548         help
 549           This option will enable prompting for a variety of advanced kernel
 550           configuration options.  These options can cause the kernel to not
 551           work if they are set incorrectly, but can be used to optimize certain
 552           aspects of kernel memory management.
 553
 554           Unless you know what you are doing, say N here.
 555
 556 comment "Default settings for advanced configuration options are used"
 557         depends on !ADVANCED_OPTIONS
 558
 559 config HIGHMEM_START_BOOL
 560         bool "Set high memory pool address"
 561         depends on ADVANCED_OPTIONS && HIGHMEM
 562         help
 563           This option allows you to set the base address of the kernel virtual
 564           area used to map high memory pages.  This can be useful in
 565           optimizing the layout of kernel virtual memory.
 566
 567           Say N here unless you know what you are doing.
 568
 569 config HIGHMEM_START
 570         hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
 571         default "0xfe000000"
 572
 573 config LOWMEM_SIZE_BOOL
 574         bool "Set maximum low memory"
 575         depends on ADVANCED_OPTIONS
 576         help
 577           This option allows you to set the maximum amount of memory which
 578           will be used as "low memory", that is, memory which the kernel can
 579           access directly, without having to set up a kernel virtual mapping.
 580           This can be useful in optimizing the layout of kernel virtual
 581           memory.
 582
 583           Say N here unless you know what you are doing.
 584
 585 config LOWMEM_SIZE
 586         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 587         default "0x30000000"
 588
 589 config KERNEL_START_BOOL
 590         bool "Set custom kernel base address"
 591         depends on ADVANCED_OPTIONS
 592         help
 593           This option allows you to set the kernel virtual address at which
 594           the kernel will map low memory (the kernel image will be linked at
 595           this address).  This can be useful in optimizing the virtual memory
 596           layout of the system.
 597
 598           Say N here unless you know what you are doing.
 599
 600 config KERNEL_START
 601         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 602         default "0xc0000000"
 603
 604 config TASK_SIZE_BOOL
 605         bool "Set custom user task size"
 606         depends on ADVANCED_OPTIONS
 607         help
 608           This option allows you to set the amount of virtual address space
 609           allocated to user tasks.  This can be useful in optimizing the
 610           virtual memory layout of the system.
 611
 612           Say N here unless you know what you are doing.
 613
 614 config TASK_SIZE
 615         hex "Size of user task space" if TASK_SIZE_BOOL
 616         default "0x80000000" if PPC_PREP || PPC_8xx
 617         default "0xc0000000"
 618
 619 config CONSISTENT_START_BOOL
 620         bool "Set custom consistent memory pool address"
 621         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 622         help
 623           This option allows you to set the base virtual address
 624           of the consistent memory pool.  This pool of virtual
 625           memory is used to make consistent memory allocations.
 626
 627 config CONSISTENT_START
 628         hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
 629         default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
 630         default "0xff100000" if NOT_COHERENT_CACHE
 631
 632 config CONSISTENT_SIZE_BOOL
 633         bool "Set custom consistent memory pool size"
 634         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 635         help
 636           This option allows you to set the size of the
 637           consistent memory pool.  This pool of virtual memory
 638           is used to make consistent memory allocations.
 639
 640 config CONSISTENT_SIZE
 641         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 642         default "0x00200000" if NOT_COHERENT_CACHE
 643
 644 config BOOT_LOAD_BOOL
 645         bool "Set the boot link/load address"
 646         depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
 647         help
 648           This option allows you to set the initial load address of the zImage
 649           or zImage.initrd file.  This can be useful if you are on a board
 650           which has a small amount of memory.
 651
 652           Say N here unless you know what you are doing.
 653
 654 config BOOT_LOAD
 655         hex "Link/load address for booting" if BOOT_LOAD_BOOL
 656         default "0x00400000" if 40x || 8xx || 8260
 657         default "0x01000000" if 44x
 658         default "0x00800000"
 659
 660 config PIN_TLB
 661         bool "Pinned Kernel TLBs (860 ONLY)"
 662         depends on ADVANCED_OPTIONS && 8xx
 663 endmenu
 664
 665 if PPC64
 666 config KERNEL_START
 667         hex
 668         default "0xc000000000000000"
 669 endif
 670
 671 source "net/Kconfig"
 672
 673 source "drivers/Kconfig"
 674
 675 source "fs/Kconfig"
 676
 677 # XXX source "arch/ppc/8xx_io/Kconfig"
 678
 679 # XXX source "arch/ppc/8260_io/Kconfig"
 680
 681 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 682
 683 source "lib/Kconfig"
 684
 685 source "kernel/Kconfig.instrumentation"
 686
 687 source "arch/powerpc/Kconfig.debug"
 688
 689 source "security/Kconfig"
 690
 691 config KEYS_COMPAT
 692         bool
 693         depends on COMPAT && KEYS
 694         default y
 695
 696 source "crypto/Kconfig"
 697
 698 config PPC_CLOCK
 699         bool
 700         default n
 701
 702 config PPC_LIB_RHEAP
 703         bool
 704