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