1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
5 mainmenu "Linux/PowerPC Kernel Configuration"
7 source "arch/powerpc/platforms/Kconfig.cputype"
29 config GENERIC_CMOS_UPDATE
35 config GENERIC_TIME_VSYSCALL
38 config GENERIC_CLOCKEVENTS
41 config GENERIC_HARDIRQS
45 config HAVE_SETUP_PER_CPU_AREA
52 config STACKTRACE_SUPPORT
56 config HAVE_LATENCYTOP_SUPPORT
59 config TRACE_IRQFLAGS_SUPPORT
64 config LOCKDEP_SUPPORT
68 config RWSEM_GENERIC_SPINLOCK
71 config RWSEM_XCHGADD_ALGORITHM
75 config GENERIC_LOCKBREAK
78 depends on SMP && PREEMPT
80 config ARCH_HAS_ILOG2_U32
84 config ARCH_HAS_ILOG2_U64
88 config GENERIC_HWEIGHT
92 config GENERIC_CALIBRATE_DELAY
96 config GENERIC_FIND_NEXT_BIT
103 Generic GPIO API support
105 config ARCH_NO_VIRT_TO_BUS
111 select HAVE_DYNAMIC_FTRACE
114 select HAVE_IOREMAP_PROT
116 select HAVE_ARCH_KGDB
117 select HAVE_KRETPROBES
119 select HAVE_DMA_ATTRS if PPC64
120 select USE_GENERIC_SMP_HELPERS if SMP
130 select COMPAT_BINFMT_ELF
132 config SYSVIPC_COMPAT
134 depends on COMPAT && SYSVIPC
137 # All PPC32s use generic nvram driver through ppc_md
142 config SCHED_NO_NO_OMIT_FRAME_POINTER
146 config ARCH_MAY_HAVE_PC_FDC
148 default !PPC_PSERIES || PCI
156 config PPC_UDBG_16550
160 config GENERIC_TBSYNC
162 default y if PPC32 && SMP
174 config SYS_SUPPORTS_APM_EMULATION
175 default y if PMAC_APM_EMU
178 config DEFAULT_UIMAGE
181 Used to allow a board to specify it wants a uImage built by default
189 depends on (PPC_PMAC && !SMP) || BROKEN
194 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
197 config ARCH_HIBERNATION_POSSIBLE
199 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
202 config ARCH_SUSPEND_POSSIBLE
204 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
206 config PPC_DCR_NATIVE
216 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
219 config PPC_OF_PLATFORM_PCI
222 depends on PPC64 # not supported on 32 bits yet
225 source "init/Kconfig"
227 source "arch/powerpc/sysdev/Kconfig"
228 source "arch/powerpc/platforms/Kconfig"
230 menu "Kernel options"
233 bool "High memory support"
236 source kernel/time/Kconfig
237 source kernel/Kconfig.hz
238 source kernel/Kconfig.preempt
239 source "fs/Kconfig.binfmt"
241 config HUGETLB_PAGE_SIZE_VARIABLE
243 depends on HUGETLB_PAGE
246 config MATH_EMULATION
247 bool "Math emulation"
248 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
250 Some PowerPC chips designed for embedded applications do not have
251 a floating-point unit and therefore do not implement the
252 floating-point instructions in the PowerPC instruction set. If you
253 say Y here, the kernel will include code to emulate a floating-point
254 unit, which will allow programs that use floating-point
257 config 8XX_MINIMAL_FPEMU
258 bool "Minimal math emulation for 8xx"
259 depends on 8xx && !MATH_EMULATION
261 Older arch/ppc kernels still emulated a few floating point
262 instructions such as load and store, even when full math
263 emulation is disabled. Say "Y" here if you want to preserve
266 It is recommended that you build a soft-float userspace instead.
269 bool "Enable IOMMU virtual merging"
273 Cause IO segments sent to a device for DMA to be merged virtually
274 by the IOMMU when they happen to have been allocated contiguously.
275 This doesn't add pressure to the IOMMU allocator. However, some
276 drivers don't support getting large merged segments coming back
279 Most drivers don't have this problem; it is safe to say Y here.
285 bool "Support for enabling/disabling CPUs"
286 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
288 Say Y here to be able to disable and re-enable individual
289 CPUs at runtime on SMP machines.
291 Say N if you are unsure.
293 config ARCH_ENABLE_MEMORY_HOTPLUG
296 config ARCH_HAS_WALK_MEMORY
299 config ARCH_ENABLE_MEMORY_HOTREMOVE
303 bool "kexec system call (EXPERIMENTAL)"
304 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
306 kexec is a system call that implements the ability to shutdown your
307 current kernel, and to start another kernel. It is like a reboot
308 but it is independent of the system firmware. And like a reboot
309 you can start any kernel with it, not just Linux.
311 The name comes from the similarity to the exec system call.
313 It is an ongoing process to be certain the hardware in a machine
314 is properly shutdown, so do not be surprised if this code does not
315 initially work for you. It may help to enable device hotplugging
316 support. As of this writing the exact hardware interface is
317 strongly in flux, so no good recommendation can be made.
320 bool "Build a kdump crash kernel"
321 depends on PPC_MULTIPLATFORM && PPC64
323 Build a kernel suitable for use as a kdump capture kernel.
324 The kernel will be linked at a different address than normal, and
325 so can only be used for Kdump.
327 Don't change this unless you know what you are doing.
330 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
331 depends on PPC_PSERIES && EXPERIMENTAL
333 Hypervisor-assisted dump is meant to be a kdump replacement
334 offering robustness and speed not possible without system
335 hypervisor assistence.
340 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
341 default y if PPC_PREP
344 bool "Distribute interrupts on all CPUs by default"
345 depends on SMP && !MV64360
347 This option gives the kernel permission to distribute IRQs across
348 multiple CPUs. Saying N here will route all IRQs to the first
349 CPU. Generally saying Y is safe, although some problems have been
350 reported with SMP Power Macintoshes with this option enabled.
355 default y if SMP && PPC_PSERIES
360 depends on NEED_MULTIPLE_NODES
362 config ARCH_SELECT_MEMORY_MODEL
366 config ARCH_FLATMEM_ENABLE
368 depends on (PPC64 && !NUMA) || PPC32
370 config ARCH_SPARSEMEM_ENABLE
373 select SPARSEMEM_VMEMMAP_ENABLE
375 config ARCH_SPARSEMEM_DEFAULT
377 depends on (SMP && PPC_PSERIES) || PPC_PS3
379 config ARCH_POPULATES_NODE_MAP
384 config ARCH_MEMORY_PROBE
386 depends on MEMORY_HOTPLUG
388 # Some NUMA nodes have memory ranges that span
389 # other nodes. Even though a pfn is valid and
390 # between a node's start and end pfns, it may not
391 # reside on that node. See memmap_init_zone()
393 config NODES_SPAN_OTHER_NODES
395 depends on NEED_MULTIPLE_NODES
397 config PPC_HAS_HASH_64K
405 select PPC_HAS_HASH_64K
407 This option changes the kernel logical page size to 64k. On machines
408 without processor support for 64k pages, the kernel will simulate
409 them by loading each individual 4k page on demand transparently,
410 while on hardware with such support, it will be used to map
411 normal application pages.
413 config FORCE_MAX_ZONEORDER
414 int "Maximum zone order"
415 default "9" if PPC_64K_PAGES
416 default "13" if PPC64 && !PPC_64K_PAGES
419 The kernel memory allocator divides physically contiguous memory
420 blocks into "zones", where each zone is a power of two number of
421 pages. This option selects the largest power of two that the kernel
422 keeps in the memory allocator. If you need to allocate very large
423 blocks of physically contiguous memory, then you may need to
426 This config option is actually maximum order plus one. For example,
427 a value of 11 means that the largest free memory block is 2^10 pages.
429 The page size is not necessarily 4KB. For example, on 64-bit
430 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
431 this in mind when choosing a value for this option.
433 config PPC_SUBPAGE_PROT
434 bool "Support setting protections for 4k subpages"
435 depends on PPC_64K_PAGES
437 This option adds support for a system call to allow user programs
438 to set access permissions (read/write, readonly, or no access)
439 on the 4k subpages of each 64k page.
442 bool "SMT (Hyperthreading) scheduler support"
443 depends on PPC64 && SMP
445 SMT scheduler support improves the CPU scheduler's decision making
446 when dealing with POWER5 cpus at a cost of slightly increased
447 overhead in some places. If unsure say N here.
449 config PROC_DEVICETREE
450 bool "Support for device tree in /proc"
453 This option adds a device-tree directory under /proc which contains
454 an image of the device tree that the kernel copies from Open
455 Firmware or other boot firmware. If unsure, say Y here.
458 bool "Default bootloader kernel arguments"
461 string "Initial kernel command string"
462 depends on CMDLINE_BOOL
463 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
465 On some platforms, there is currently no way for the boot loader to
466 pass arguments to the kernel. For these platforms, you can supply
467 some command-line options at build time by entering them here. In
468 most cases you will need to specify the root device here.
471 string "Additional default image types"
473 List additional targets to be built by the bootwrapper here (separated
474 by spaces). This is useful for targets that depend of device tree
475 files in the .dts directory.
477 Targets in this list will be build as part of the default build
478 target, or when the user does a 'make zImage' or a
479 'make zImage.initrd'.
481 If unsure, leave blank
484 config ARCH_WANTS_FREEZER_CONTROL
488 source kernel/power/Kconfig
492 bool "Enable seccomp to safely compute untrusted bytecode"
496 This kernel feature is useful for number crunching applications
497 that may need to compute untrusted bytecode during their
498 execution. By using pipes or other transports made available to
499 the process as file descriptors supporting the read/write
500 syscalls, it's possible to isolate those applications in
501 their own address space using seccomp. Once seccomp is
502 enabled via /proc/<pid>/seccomp, it cannot be disabled
503 and the task is only allowed to execute a few safe syscalls
504 defined by each seccomp mode.
506 If unsure, say Y. Only embedded should say N here.
512 default !PPC_ISERIES || PCI
517 bool "Support for ISA-bus hardware"
518 depends on PPC_PREP || PPC_CHRP
521 Find out whether you have ISA slots on your motherboard. ISA is the
522 name of a bus system, i.e. the way the CPU talks to the other stuff
523 inside your box. If you have an Apple machine, say N here; if you
524 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
525 you have an embedded board, consult your board documentation.
531 config GENERIC_ISA_DMA
533 depends on PPC64 || POWER4 || 6xx && !CPM2
536 config PPC_INDIRECT_PCI
539 default y if 40x || 44x
553 select PPC_INDIRECT_PCI
561 Freescale Localbus support
565 depends on PPC_83xx || QUICC_ENGINE || CPM2
567 Freescale General-purpose Timers support
569 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
573 # Platforms that what PCI turned unconditionally just do select PCI
574 # in their config node. Platforms that want to choose at config
575 # time should select PPC_PCI_CHOICE
576 config PPC_PCI_CHOICE
580 bool "PCI support" if PPC_PCI_CHOICE
581 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
582 && !PPC_85xx && !PPC_86xx
583 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
584 default PCI_QSPAN if !4xx && !CPM2 && 8xx
585 select ARCH_SUPPORTS_MSI
587 Find out whether your system includes a PCI bus. PCI is the name of
588 a bus system, i.e. the way the CPU talks to the other stuff inside
589 your box. If you say Y here, the kernel will include drivers and
590 infrastructure code to support PCI bus devices.
600 depends on !4xx && !CPM2 && 8xx
603 Say Y here if you have a system based on a Motorola 8xx-series
604 embedded processor with a QSPAN PCI interface, otherwise say N.
608 depends on PCI && 8260
609 select PPC_INDIRECT_PCI
613 bool "Enable workaround for MPC826x erratum PCI 9"
614 depends on PCI_8260 && !8272
618 prompt "IDMA channel for PCI 9 workaround"
621 config 8260_PCI9_IDMA1
624 config 8260_PCI9_IDMA2
627 config 8260_PCI9_IDMA3
630 config 8260_PCI9_IDMA4
635 source "drivers/pci/pcie/Kconfig"
637 source "drivers/pci/Kconfig"
639 source "drivers/pcmcia/Kconfig"
641 source "drivers/pci/hotplug/Kconfig"
648 bool "RapidIO support"
649 depends on HAS_RAPIDIO
651 If you say Y here, the kernel will include drivers and
652 infrastructure code to support RapidIO interconnect devices.
654 source "drivers/rapidio/Kconfig"
658 menu "Advanced setup"
661 config ADVANCED_OPTIONS
662 bool "Prompt for advanced kernel configuration options"
664 This option will enable prompting for a variety of advanced kernel
665 configuration options. These options can cause the kernel to not
666 work if they are set incorrectly, but can be used to optimize certain
667 aspects of kernel memory management.
669 Unless you know what you are doing, say N here.
671 comment "Default settings for advanced configuration options are used"
672 depends on !ADVANCED_OPTIONS
674 config LOWMEM_SIZE_BOOL
675 bool "Set maximum low memory"
676 depends on ADVANCED_OPTIONS
678 This option allows you to set the maximum amount of memory which
679 will be used as "low memory", that is, memory which the kernel can
680 access directly, without having to set up a kernel virtual mapping.
681 This can be useful in optimizing the layout of kernel virtual
684 Say N here unless you know what you are doing.
687 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
691 bool "Build a relocatable kernel (EXPERIMENTAL)"
692 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
694 This builds a kernel image that is capable of running at the
695 location the kernel is loaded at (some alignment restrictions may
698 One use is for the kexec on panic case where the recovery kernel
699 must live at a different physical address than the primary
702 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
703 it has been loaded at and the compile time physical addresses
704 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
705 setting can still be useful to bootwrappers that need to know the
706 load location of the kernel (eg. u-boot/mkimage).
708 config PAGE_OFFSET_BOOL
709 bool "Set custom page offset address"
710 depends on ADVANCED_OPTIONS
712 This option allows you to set the kernel virtual address at which
713 the kernel will map low memory. This can be useful in optimizing
714 the virtual memory layout of the system.
716 Say N here unless you know what you are doing.
719 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
722 config KERNEL_START_BOOL
723 bool "Set custom kernel base address"
724 depends on ADVANCED_OPTIONS
726 This option allows you to set the kernel virtual address at which
727 the kernel will be loaded. Normally this should match PAGE_OFFSET
728 however there are times (like kdump) that one might not want them
731 Say N here unless you know what you are doing.
734 hex "Virtual address of kernel base" if KERNEL_START_BOOL
735 default PAGE_OFFSET if PAGE_OFFSET_BOOL
736 default "0xc2000000" if CRASH_DUMP
739 config PHYSICAL_START_BOOL
740 bool "Set physical address where the kernel is loaded"
741 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
743 This gives the physical address where the kernel is loaded.
745 Say N here unless you know what you are doing.
747 config PHYSICAL_START
748 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
749 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
752 config PHYSICAL_ALIGN
754 default "0x10000000" if FSL_BOOKE
756 This value puts the alignment restrictions on physical address
757 where kernel is loaded and run from. Kernel is compiled for an
758 address which meets above alignment restriction.
760 config TASK_SIZE_BOOL
761 bool "Set custom user task size"
762 depends on ADVANCED_OPTIONS
764 This option allows you to set the amount of virtual address space
765 allocated to user tasks. This can be useful in optimizing the
766 virtual memory layout of the system.
768 Say N here unless you know what you are doing.
771 hex "Size of user task space" if TASK_SIZE_BOOL
772 default "0x80000000" if PPC_PREP || PPC_8xx
775 config CONSISTENT_START_BOOL
776 bool "Set custom consistent memory pool address"
777 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
779 This option allows you to set the base virtual address
780 of the consistent memory pool. This pool of virtual
781 memory is used to make consistent memory allocations.
783 config CONSISTENT_START
784 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
785 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
786 default "0xff100000" if NOT_COHERENT_CACHE
788 config CONSISTENT_SIZE_BOOL
789 bool "Set custom consistent memory pool size"
790 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
792 This option allows you to set the size of the
793 consistent memory pool. This pool of virtual memory
794 is used to make consistent memory allocations.
796 config CONSISTENT_SIZE
797 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
798 default "0x00200000" if NOT_COHERENT_CACHE
801 bool "Pinned Kernel TLBs (860 ONLY)"
802 depends on ADVANCED_OPTIONS && 8xx
808 default "0xc000000000000000"
811 default "0xc000000002000000" if CRASH_DUMP
812 default "0xc000000000000000"
813 config PHYSICAL_START
815 default "0x02000000" if CRASH_DUMP
821 source "drivers/Kconfig"
825 # XXX source "arch/ppc/8xx_io/Kconfig"
827 # XXX source "arch/ppc/8260_io/Kconfig"
829 source "arch/powerpc/sysdev/qe_lib/Kconfig"
833 source "arch/powerpc/Kconfig.debug"
835 source "security/Kconfig"
839 depends on COMPAT && KEYS
842 source "crypto/Kconfig"
852 source "arch/powerpc/kvm/Kconfig"