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