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