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
115 select HAVE_KRETPROBES
117 select HAVE_DMA_ATTRS if PPC64
118 select USE_GENERIC_SMP_HELPERS if SMP
128 select COMPAT_BINFMT_ELF
130 config SYSVIPC_COMPAT
132 depends on COMPAT && SYSVIPC
135 # All PPC32s use generic nvram driver through ppc_md
140 config SCHED_NO_NO_OMIT_FRAME_POINTER
144 config ARCH_MAY_HAVE_PC_FDC
146 default !PPC_PSERIES || PCI
154 config PPC_UDBG_16550
158 config GENERIC_TBSYNC
160 default y if PPC32 && SMP
172 config SYS_SUPPORTS_APM_EMULATION
173 default y if PMAC_APM_EMU
176 config DEFAULT_UIMAGE
179 Used to allow a board to specify it wants a uImage built by default
187 depends on (PPC_PMAC && !SMP) || BROKEN
192 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
195 config ARCH_HIBERNATION_POSSIBLE
197 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
200 config ARCH_SUSPEND_POSSIBLE
202 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
204 config PPC_DCR_NATIVE
214 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
217 config PPC_OF_PLATFORM_PCI
220 depends on PPC64 # not supported on 32 bits yet
223 source "init/Kconfig"
225 source "arch/powerpc/sysdev/Kconfig"
226 source "arch/powerpc/platforms/Kconfig"
228 menu "Kernel options"
231 bool "High memory support"
234 source kernel/time/Kconfig
235 source kernel/Kconfig.hz
236 source kernel/Kconfig.preempt
237 source "fs/Kconfig.binfmt"
239 config HUGETLB_PAGE_SIZE_VARIABLE
241 depends on HUGETLB_PAGE
244 config MATH_EMULATION
245 bool "Math emulation"
246 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
248 Some PowerPC chips designed for embedded applications do not have
249 a floating-point unit and therefore do not implement the
250 floating-point instructions in the PowerPC instruction set. If you
251 say Y here, the kernel will include code to emulate a floating-point
252 unit, which will allow programs that use floating-point
255 config 8XX_MINIMAL_FPEMU
256 bool "Minimal math emulation for 8xx"
257 depends on 8xx && !MATH_EMULATION
259 Older arch/ppc kernels still emulated a few floating point
260 instructions such as load and store, even when full math
261 emulation is disabled. Say "Y" here if you want to preserve
264 It is recommended that you build a soft-float userspace instead.
267 bool "Enable IOMMU virtual merging"
271 Cause IO segments sent to a device for DMA to be merged virtually
272 by the IOMMU when they happen to have been allocated contiguously.
273 This doesn't add pressure to the IOMMU allocator. However, some
274 drivers don't support getting large merged segments coming back
277 Most drivers don't have this problem; it is safe to say Y here.
283 bool "Support for enabling/disabling CPUs"
284 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
286 Say Y here to be able to disable and re-enable individual
287 CPUs at runtime on SMP machines.
289 Say N if you are unsure.
291 config ARCH_ENABLE_MEMORY_HOTPLUG
294 config ARCH_HAS_WALK_MEMORY
297 config ARCH_ENABLE_MEMORY_HOTREMOVE
301 bool "kexec system call (EXPERIMENTAL)"
302 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
304 kexec is a system call that implements the ability to shutdown your
305 current kernel, and to start another kernel. It is like a reboot
306 but it is independent of the system firmware. And like a reboot
307 you can start any kernel with it, not just Linux.
309 The name comes from the similarity to the exec system call.
311 It is an ongoing process to be certain the hardware in a machine
312 is properly shutdown, so do not be surprised if this code does not
313 initially work for you. It may help to enable device hotplugging
314 support. As of this writing the exact hardware interface is
315 strongly in flux, so no good recommendation can be made.
318 bool "Build a kdump crash kernel"
319 depends on PPC_MULTIPLATFORM && PPC64
321 Build a kernel suitable for use as a kdump capture kernel.
322 The kernel will be linked at a different address than normal, and
323 so can only be used for Kdump.
325 Don't change this unless you know what you are doing.
328 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
329 depends on PPC_PSERIES && EXPERIMENTAL
331 Hypervisor-assisted dump is meant to be a kdump replacement
332 offering robustness and speed not possible without system
333 hypervisor assistence.
338 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
339 default y if PPC_PREP
342 bool "Distribute interrupts on all CPUs by default"
343 depends on SMP && !MV64360
345 This option gives the kernel permission to distribute IRQs across
346 multiple CPUs. Saying N here will route all IRQs to the first
347 CPU. Generally saying Y is safe, although some problems have been
348 reported with SMP Power Macintoshes with this option enabled.
353 default y if SMP && PPC_PSERIES
358 depends on NEED_MULTIPLE_NODES
360 config ARCH_SELECT_MEMORY_MODEL
364 config ARCH_FLATMEM_ENABLE
366 depends on (PPC64 && !NUMA) || PPC32
368 config ARCH_SPARSEMEM_ENABLE
371 select SPARSEMEM_VMEMMAP_ENABLE
373 config ARCH_SPARSEMEM_DEFAULT
375 depends on (SMP && PPC_PSERIES) || PPC_PS3
377 config ARCH_POPULATES_NODE_MAP
382 config ARCH_MEMORY_PROBE
384 depends on MEMORY_HOTPLUG
386 # Some NUMA nodes have memory ranges that span
387 # other nodes. Even though a pfn is valid and
388 # between a node's start and end pfns, it may not
389 # reside on that node. See memmap_init_zone()
391 config NODES_SPAN_OTHER_NODES
393 depends on NEED_MULTIPLE_NODES
395 config PPC_HAS_HASH_64K
403 select PPC_HAS_HASH_64K
405 This option changes the kernel logical page size to 64k. On machines
406 without processor support for 64k pages, the kernel will simulate
407 them by loading each individual 4k page on demand transparently,
408 while on hardware with such support, it will be used to map
409 normal application pages.
411 config FORCE_MAX_ZONEORDER
412 int "Maximum zone order"
413 default "9" if PPC_64K_PAGES
414 default "13" if PPC64 && !PPC_64K_PAGES
417 The kernel memory allocator divides physically contiguous memory
418 blocks into "zones", where each zone is a power of two number of
419 pages. This option selects the largest power of two that the kernel
420 keeps in the memory allocator. If you need to allocate very large
421 blocks of physically contiguous memory, then you may need to
424 This config option is actually maximum order plus one. For example,
425 a value of 11 means that the largest free memory block is 2^10 pages.
427 The page size is not necessarily 4KB. For example, on 64-bit
428 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
429 this in mind when choosing a value for this option.
431 config PPC_SUBPAGE_PROT
432 bool "Support setting protections for 4k subpages"
433 depends on PPC_64K_PAGES
435 This option adds support for a system call to allow user programs
436 to set access permissions (read/write, readonly, or no access)
437 on the 4k subpages of each 64k page.
440 bool "SMT (Hyperthreading) scheduler support"
441 depends on PPC64 && SMP
443 SMT scheduler support improves the CPU scheduler's decision making
444 when dealing with POWER5 cpus at a cost of slightly increased
445 overhead in some places. If unsure say N here.
447 config PROC_DEVICETREE
448 bool "Support for device tree in /proc"
451 This option adds a device-tree directory under /proc which contains
452 an image of the device tree that the kernel copies from Open
453 Firmware or other boot firmware. If unsure, say Y here.
456 bool "Default bootloader kernel arguments"
459 string "Initial kernel command string"
460 depends on CMDLINE_BOOL
461 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
463 On some platforms, there is currently no way for the boot loader to
464 pass arguments to the kernel. For these platforms, you can supply
465 some command-line options at build time by entering them here. In
466 most cases you will need to specify the root device here.
469 string "Additional default image types"
471 List additional targets to be built by the bootwrapper here (separated
472 by spaces). This is useful for targets that depend of device tree
473 files in the .dts directory.
475 Targets in this list will be build as part of the default build
476 target, or when the user does a 'make zImage' or a
477 'make zImage.initrd'.
479 If unsure, leave blank
482 config ARCH_WANTS_FREEZER_CONTROL
486 source kernel/power/Kconfig
490 bool "Enable seccomp to safely compute untrusted bytecode"
494 This kernel feature is useful for number crunching applications
495 that may need to compute untrusted bytecode during their
496 execution. By using pipes or other transports made available to
497 the process as file descriptors supporting the read/write
498 syscalls, it's possible to isolate those applications in
499 their own address space using seccomp. Once seccomp is
500 enabled via /proc/<pid>/seccomp, it cannot be disabled
501 and the task is only allowed to execute a few safe syscalls
502 defined by each seccomp mode.
504 If unsure, say Y. Only embedded should say N here.
510 default !PPC_ISERIES || PCI
515 bool "Support for ISA-bus hardware"
516 depends on PPC_PREP || PPC_CHRP
519 Find out whether you have ISA slots on your motherboard. ISA is the
520 name of a bus system, i.e. the way the CPU talks to the other stuff
521 inside your box. If you have an Apple machine, say N here; if you
522 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
523 you have an embedded board, consult your board documentation.
529 config GENERIC_ISA_DMA
531 depends on PPC64 || POWER4 || 6xx && !CPM2
534 config PPC_INDIRECT_PCI
537 default y if 40x || 44x
551 select PPC_INDIRECT_PCI
559 Freescale Localbus support
563 depends on PPC_83xx || QUICC_ENGINE || CPM2
565 Freescale General-purpose Timers support
567 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
572 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
573 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
575 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
576 && !PPC_85xx && !PPC_86xx
577 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
578 default PCI_QSPAN if !4xx && !CPM2 && 8xx
579 select ARCH_SUPPORTS_MSI
581 Find out whether your system includes a PCI bus. PCI is the name of
582 a bus system, i.e. the way the CPU talks to the other stuff inside
583 your box. If you say Y here, the kernel will include drivers and
584 infrastructure code to support PCI bus devices.
594 depends on !4xx && !CPM2 && 8xx
597 Say Y here if you have a system based on a Motorola 8xx-series
598 embedded processor with a QSPAN PCI interface, otherwise say N.
602 depends on PCI && 8260
603 select PPC_INDIRECT_PCI
607 bool "Enable workaround for MPC826x erratum PCI 9"
608 depends on PCI_8260 && !8272
612 prompt "IDMA channel for PCI 9 workaround"
615 config 8260_PCI9_IDMA1
618 config 8260_PCI9_IDMA2
621 config 8260_PCI9_IDMA3
624 config 8260_PCI9_IDMA4
629 source "drivers/pci/pcie/Kconfig"
631 source "drivers/pci/Kconfig"
633 source "drivers/pcmcia/Kconfig"
635 source "drivers/pci/hotplug/Kconfig"
642 bool "RapidIO support"
643 depends on HAS_RAPIDIO
645 If you say Y here, the kernel will include drivers and
646 infrastructure code to support RapidIO interconnect devices.
648 source "drivers/rapidio/Kconfig"
652 menu "Advanced setup"
655 config ADVANCED_OPTIONS
656 bool "Prompt for advanced kernel configuration options"
658 This option will enable prompting for a variety of advanced kernel
659 configuration options. These options can cause the kernel to not
660 work if they are set incorrectly, but can be used to optimize certain
661 aspects of kernel memory management.
663 Unless you know what you are doing, say N here.
665 comment "Default settings for advanced configuration options are used"
666 depends on !ADVANCED_OPTIONS
668 config LOWMEM_SIZE_BOOL
669 bool "Set maximum low memory"
670 depends on ADVANCED_OPTIONS
672 This option allows you to set the maximum amount of memory which
673 will be used as "low memory", that is, memory which the kernel can
674 access directly, without having to set up a kernel virtual mapping.
675 This can be useful in optimizing the layout of kernel virtual
678 Say N here unless you know what you are doing.
681 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
685 bool "Build a relocatable kernel (EXPERIMENTAL)"
686 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
688 This builds a kernel image that is capable of running at the
689 location the kernel is loaded at (some alignment restrictions may
692 One use is for the kexec on panic case where the recovery kernel
693 must live at a different physical address than the primary
696 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
697 it has been loaded at and the compile time physical addresses
698 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
699 setting can still be useful to bootwrappers that need to know the
700 load location of the kernel (eg. u-boot/mkimage).
702 config PAGE_OFFSET_BOOL
703 bool "Set custom page offset address"
704 depends on ADVANCED_OPTIONS
706 This option allows you to set the kernel virtual address at which
707 the kernel will map low memory. This can be useful in optimizing
708 the virtual memory layout of the system.
710 Say N here unless you know what you are doing.
713 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
716 config KERNEL_START_BOOL
717 bool "Set custom kernel base address"
718 depends on ADVANCED_OPTIONS
720 This option allows you to set the kernel virtual address at which
721 the kernel will be loaded. Normally this should match PAGE_OFFSET
722 however there are times (like kdump) that one might not want them
725 Say N here unless you know what you are doing.
728 hex "Virtual address of kernel base" if KERNEL_START_BOOL
729 default PAGE_OFFSET if PAGE_OFFSET_BOOL
730 default "0xc2000000" if CRASH_DUMP
733 config PHYSICAL_START_BOOL
734 bool "Set physical address where the kernel is loaded"
735 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
737 This gives the physical address where the kernel is loaded.
739 Say N here unless you know what you are doing.
741 config PHYSICAL_START
742 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
743 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
746 config PHYSICAL_ALIGN
748 default "0x10000000" if FSL_BOOKE
750 This value puts the alignment restrictions on physical address
751 where kernel is loaded and run from. Kernel is compiled for an
752 address which meets above alignment restriction.
754 config TASK_SIZE_BOOL
755 bool "Set custom user task size"
756 depends on ADVANCED_OPTIONS
758 This option allows you to set the amount of virtual address space
759 allocated to user tasks. This can be useful in optimizing the
760 virtual memory layout of the system.
762 Say N here unless you know what you are doing.
765 hex "Size of user task space" if TASK_SIZE_BOOL
766 default "0x80000000" if PPC_PREP || PPC_8xx
769 config CONSISTENT_START_BOOL
770 bool "Set custom consistent memory pool address"
771 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
773 This option allows you to set the base virtual address
774 of the consistent memory pool. This pool of virtual
775 memory is used to make consistent memory allocations.
777 config CONSISTENT_START
778 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
779 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
780 default "0xff100000" if NOT_COHERENT_CACHE
782 config CONSISTENT_SIZE_BOOL
783 bool "Set custom consistent memory pool size"
784 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
786 This option allows you to set the size of the
787 consistent memory pool. This pool of virtual memory
788 is used to make consistent memory allocations.
790 config CONSISTENT_SIZE
791 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
792 default "0x00200000" if NOT_COHERENT_CACHE
795 bool "Pinned Kernel TLBs (860 ONLY)"
796 depends on ADVANCED_OPTIONS && 8xx
802 default "0xc000000000000000"
805 default "0xc000000002000000" if CRASH_DUMP
806 default "0xc000000000000000"
807 config PHYSICAL_START
809 default "0x02000000" if CRASH_DUMP
815 source "drivers/Kconfig"
819 # XXX source "arch/ppc/8xx_io/Kconfig"
821 # XXX source "arch/ppc/8260_io/Kconfig"
823 source "arch/powerpc/sysdev/qe_lib/Kconfig"
827 source "arch/powerpc/Kconfig.debug"
829 source "security/Kconfig"
833 depends on COMPAT && KEYS
836 source "crypto/Kconfig"
845 source "arch/powerpc/kvm/Kconfig"