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"
22 config ARCH_PHYS_ADDR_T_64BIT
23 def_bool PPC64 || PHYS_64BIT
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_FUNCTION_TRACER
112 select ARCH_WANT_OPTIONAL_GPIOLIB
114 select HAVE_IOREMAP_PROT
115 select HAVE_EFFICIENT_UNALIGNED_ACCESS
117 select HAVE_ARCH_KGDB
118 select HAVE_KRETPROBES
119 select HAVE_ARCH_TRACEHOOK
121 select HAVE_DMA_ATTRS if PPC64
122 select USE_GENERIC_SMP_HELPERS if SMP
132 select COMPAT_BINFMT_ELF
134 config SYSVIPC_COMPAT
136 depends on COMPAT && SYSVIPC
139 # All PPC32s use generic nvram driver through ppc_md
144 config SCHED_OMIT_FRAME_POINTER
148 config ARCH_MAY_HAVE_PC_FDC
150 default !PPC_PSERIES || PCI
158 config PPC_UDBG_16550
162 config GENERIC_TBSYNC
164 default y if PPC32 && SMP
176 config SYS_SUPPORTS_APM_EMULATION
177 default y if PMAC_APM_EMU
180 config DEFAULT_UIMAGE
183 Used to allow a board to specify it wants a uImage built by default
191 depends on (PPC_PMAC && !SMP) || BROKEN
196 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
199 config ARCH_HIBERNATION_POSSIBLE
201 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
204 config ARCH_SUSPEND_POSSIBLE
206 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
208 config PPC_DCR_NATIVE
218 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
221 config PPC_OF_PLATFORM_PCI
224 depends on PPC64 # not supported on 32 bits yet
227 source "init/Kconfig"
229 source "kernel/Kconfig.freezer"
231 source "arch/powerpc/sysdev/Kconfig"
232 source "arch/powerpc/platforms/Kconfig"
234 menu "Kernel options"
237 bool "High memory support"
240 source kernel/time/Kconfig
241 source kernel/Kconfig.hz
242 source kernel/Kconfig.preempt
243 source "fs/Kconfig.binfmt"
245 config HUGETLB_PAGE_SIZE_VARIABLE
247 depends on HUGETLB_PAGE
250 config MATH_EMULATION
251 bool "Math emulation"
252 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
254 Some PowerPC chips designed for embedded applications do not have
255 a floating-point unit and therefore do not implement the
256 floating-point instructions in the PowerPC instruction set. If you
257 say Y here, the kernel will include code to emulate a floating-point
258 unit, which will allow programs that use floating-point
261 config 8XX_MINIMAL_FPEMU
262 bool "Minimal math emulation for 8xx"
263 depends on 8xx && !MATH_EMULATION
265 Older arch/ppc kernels still emulated a few floating point
266 instructions such as load and store, even when full math
267 emulation is disabled. Say "Y" here if you want to preserve
270 It is recommended that you build a soft-float userspace instead.
273 bool "Enable IOMMU virtual merging"
277 Cause IO segments sent to a device for DMA to be merged virtually
278 by the IOMMU when they happen to have been allocated contiguously.
279 This doesn't add pressure to the IOMMU allocator. However, some
280 drivers don't support getting large merged segments coming back
283 Most drivers don't have this problem; it is safe to say Y here.
288 config PPC_NEED_DMA_SYNC_OPS
290 depends on NOT_COHERENT_CACHE
293 bool "Support for enabling/disabling CPUs"
294 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
296 Say Y here to be able to disable and re-enable individual
297 CPUs at runtime on SMP machines.
299 Say N if you are unsure.
301 config ARCH_ENABLE_MEMORY_HOTPLUG
304 config ARCH_HAS_WALK_MEMORY
307 config ARCH_ENABLE_MEMORY_HOTREMOVE
311 bool "kexec system call (EXPERIMENTAL)"
312 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
314 kexec is a system call that implements the ability to shutdown your
315 current kernel, and to start another kernel. It is like a reboot
316 but it is independent of the system firmware. And like a reboot
317 you can start any kernel with it, not just Linux.
319 The name comes from the similarity to the exec system call.
321 It is an ongoing process to be certain the hardware in a machine
322 is properly shutdown, so do not be surprised if this code does not
323 initially work for you. It may help to enable device hotplugging
324 support. As of this writing the exact hardware interface is
325 strongly in flux, so no good recommendation can be made.
328 bool "Build a kdump crash kernel"
329 depends on PPC64 || 6xx
330 select RELOCATABLE if PPC64
332 Build a kernel suitable for use as a kdump capture kernel.
333 The same kernel binary can be used as production kernel and dump
337 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
338 depends on PPC_PSERIES && EXPERIMENTAL
340 Hypervisor-assisted dump is meant to be a kdump replacement
341 offering robustness and speed not possible without system
342 hypervisor assistence.
347 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
348 default y if PPC_PREP
351 bool "Distribute interrupts on all CPUs by default"
352 depends on SMP && !MV64360
354 This option gives the kernel permission to distribute IRQs across
355 multiple CPUs. Saying N here will route all IRQs to the first
356 CPU. Generally saying Y is safe, although some problems have been
357 reported with SMP Power Macintoshes with this option enabled.
362 default y if SMP && PPC_PSERIES
367 depends on NEED_MULTIPLE_NODES
369 config ARCH_SELECT_MEMORY_MODEL
373 config ARCH_FLATMEM_ENABLE
375 depends on (PPC64 && !NUMA) || PPC32
377 config ARCH_SPARSEMEM_ENABLE
380 select SPARSEMEM_VMEMMAP_ENABLE
382 config ARCH_SPARSEMEM_DEFAULT
384 depends on (SMP && PPC_PSERIES) || PPC_PS3
386 config ARCH_POPULATES_NODE_MAP
391 config ARCH_MEMORY_PROBE
393 depends on MEMORY_HOTPLUG
395 # Some NUMA nodes have memory ranges that span
396 # other nodes. Even though a pfn is valid and
397 # between a node's start and end pfns, it may not
398 # reside on that node. See memmap_init_zone()
400 config NODES_SPAN_OTHER_NODES
402 depends on NEED_MULTIPLE_NODES
404 config PPC_HAS_HASH_64K
413 Select the kernel logical page size. Increasing the page size
414 will reduce software overhead at each page boundary, allow
415 hardware prefetch mechanisms to be more effective, and allow
416 larger dma transfers increasing IO efficiency and reducing
417 overhead. However the utilization of memory will increase.
418 For example, each cached file will using a multiple of the
419 page size to hold its contents and the difference between the
420 end of file and the end of page is wasted.
422 Some dedicated systems, such as software raid serving with
423 accelerated calculations, have shown significant increases.
425 If you configure a 64 bit kernel for 64k pages but the
426 processor does not support them, then the kernel will simulate
427 them with 4k pages, loading them on demand, but with the
428 reduced software overhead and larger internal fragmentation.
429 For the 32 bit kernel, a large page option will not be offered
430 unless it is supported by the configured processor.
432 If unsure, choose 4K_PAGES.
438 bool "16k page size" if 44x
441 bool "64k page size" if 44x || PPC_STD_MMU_64
442 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
446 config FORCE_MAX_ZONEORDER
447 int "Maximum zone order"
448 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
449 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
450 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
451 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
452 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
453 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
454 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
455 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
459 The kernel memory allocator divides physically contiguous memory
460 blocks into "zones", where each zone is a power of two number of
461 pages. This option selects the largest power of two that the kernel
462 keeps in the memory allocator. If you need to allocate very large
463 blocks of physically contiguous memory, then you may need to
466 This config option is actually maximum order plus one. For example,
467 a value of 11 means that the largest free memory block is 2^10 pages.
469 The page size is not necessarily 4KB. For example, on 64-bit
470 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
471 this in mind when choosing a value for this option.
473 config PPC_SUBPAGE_PROT
474 bool "Support setting protections for 4k subpages"
475 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
477 This option adds support for a system call to allow user programs
478 to set access permissions (read/write, readonly, or no access)
479 on the 4k subpages of each 64k page.
482 bool "SMT (Hyperthreading) scheduler support"
483 depends on PPC64 && SMP
485 SMT scheduler support improves the CPU scheduler's decision making
486 when dealing with POWER5 cpus at a cost of slightly increased
487 overhead in some places. If unsure say N here.
489 config PROC_DEVICETREE
490 bool "Support for device tree in /proc"
493 This option adds a device-tree directory under /proc which contains
494 an image of the device tree that the kernel copies from Open
495 Firmware or other boot firmware. If unsure, say Y here.
498 bool "Default bootloader kernel arguments"
501 string "Initial kernel command string"
502 depends on CMDLINE_BOOL
503 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
505 On some platforms, there is currently no way for the boot loader to
506 pass arguments to the kernel. For these platforms, you can supply
507 some command-line options at build time by entering them here. In
508 most cases you will need to specify the root device here.
511 string "Additional default image types"
513 List additional targets to be built by the bootwrapper here (separated
514 by spaces). This is useful for targets that depend of device tree
515 files in the .dts directory.
517 Targets in this list will be build as part of the default build
518 target, or when the user does a 'make zImage' or a
519 'make zImage.initrd'.
521 If unsure, leave blank
524 config ARCH_WANTS_FREEZER_CONTROL
528 source kernel/power/Kconfig
532 bool "Enable seccomp to safely compute untrusted bytecode"
536 This kernel feature is useful for number crunching applications
537 that may need to compute untrusted bytecode during their
538 execution. By using pipes or other transports made available to
539 the process as file descriptors supporting the read/write
540 syscalls, it's possible to isolate those applications in
541 their own address space using seccomp. Once seccomp is
542 enabled via /proc/<pid>/seccomp, it cannot be disabled
543 and the task is only allowed to execute a few safe syscalls
544 defined by each seccomp mode.
546 If unsure, say Y. Only embedded should say N here.
552 default !PPC_ISERIES || PCI
557 bool "Support for ISA-bus hardware"
558 depends on PPC_PREP || PPC_CHRP
561 Find out whether you have ISA slots on your motherboard. ISA is the
562 name of a bus system, i.e. the way the CPU talks to the other stuff
563 inside your box. If you have an Apple machine, say N here; if you
564 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
565 you have an embedded board, consult your board documentation.
571 config GENERIC_ISA_DMA
573 depends on PPC64 || POWER4 || 6xx && !CPM2
576 config PPC_INDIRECT_PCI
579 default y if 40x || 44x
593 select PPC_INDIRECT_PCI
601 Freescale Localbus support
605 depends on PPC_83xx || QUICC_ENGINE || CPM2
607 Freescale General-purpose Timers support
609 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
613 # Platforms that what PCI turned unconditionally just do select PCI
614 # in their config node. Platforms that want to choose at config
615 # time should select PPC_PCI_CHOICE
616 config PPC_PCI_CHOICE
620 bool "PCI support" if PPC_PCI_CHOICE
621 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
622 && !PPC_85xx && !PPC_86xx
623 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
624 default PCI_QSPAN if !4xx && !CPM2 && 8xx
625 select ARCH_SUPPORTS_MSI
627 Find out whether your system includes a PCI bus. PCI is the name of
628 a bus system, i.e. the way the CPU talks to the other stuff inside
629 your box. If you say Y here, the kernel will include drivers and
630 infrastructure code to support PCI bus devices.
640 depends on !4xx && !CPM2 && 8xx
643 Say Y here if you have a system based on a Motorola 8xx-series
644 embedded processor with a QSPAN PCI interface, otherwise say N.
648 depends on PCI && 8260
649 select PPC_INDIRECT_PCI
653 bool "Enable workaround for MPC826x erratum PCI 9"
654 depends on PCI_8260 && !8272
658 prompt "IDMA channel for PCI 9 workaround"
661 config 8260_PCI9_IDMA1
664 config 8260_PCI9_IDMA2
667 config 8260_PCI9_IDMA3
670 config 8260_PCI9_IDMA4
675 source "drivers/pci/pcie/Kconfig"
677 source "drivers/pci/Kconfig"
679 source "drivers/pcmcia/Kconfig"
681 source "drivers/pci/hotplug/Kconfig"
688 bool "RapidIO support"
689 depends on HAS_RAPIDIO
691 If you say Y here, the kernel will include drivers and
692 infrastructure code to support RapidIO interconnect devices.
694 source "drivers/rapidio/Kconfig"
698 menu "Advanced setup"
701 config ADVANCED_OPTIONS
702 bool "Prompt for advanced kernel configuration options"
704 This option will enable prompting for a variety of advanced kernel
705 configuration options. These options can cause the kernel to not
706 work if they are set incorrectly, but can be used to optimize certain
707 aspects of kernel memory management.
709 Unless you know what you are doing, say N here.
711 comment "Default settings for advanced configuration options are used"
712 depends on !ADVANCED_OPTIONS
714 config LOWMEM_SIZE_BOOL
715 bool "Set maximum low memory"
716 depends on ADVANCED_OPTIONS
718 This option allows you to set the maximum amount of memory which
719 will be used as "low memory", that is, memory which the kernel can
720 access directly, without having to set up a kernel virtual mapping.
721 This can be useful in optimizing the layout of kernel virtual
724 Say N here unless you know what you are doing.
727 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
731 bool "Build a relocatable kernel (EXPERIMENTAL)"
732 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
734 This builds a kernel image that is capable of running at the
735 location the kernel is loaded at (some alignment restrictions may
738 One use is for the kexec on panic case where the recovery kernel
739 must live at a different physical address than the primary
742 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
743 it has been loaded at and the compile time physical addresses
744 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
745 setting can still be useful to bootwrappers that need to know the
746 load location of the kernel (eg. u-boot/mkimage).
748 config PAGE_OFFSET_BOOL
749 bool "Set custom page offset address"
750 depends on ADVANCED_OPTIONS
752 This option allows you to set the kernel virtual address at which
753 the kernel will map low memory. This can be useful in optimizing
754 the virtual memory layout of the system.
756 Say N here unless you know what you are doing.
759 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
762 config KERNEL_START_BOOL
763 bool "Set custom kernel base address"
764 depends on ADVANCED_OPTIONS
766 This option allows you to set the kernel virtual address at which
767 the kernel will be loaded. Normally this should match PAGE_OFFSET
768 however there are times (like kdump) that one might not want them
771 Say N here unless you know what you are doing.
774 hex "Virtual address of kernel base" if KERNEL_START_BOOL
775 default PAGE_OFFSET if PAGE_OFFSET_BOOL
776 default "0xc2000000" if CRASH_DUMP
779 config PHYSICAL_START_BOOL
780 bool "Set physical address where the kernel is loaded"
781 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
783 This gives the physical address where the kernel is loaded.
785 Say N here unless you know what you are doing.
787 config PHYSICAL_START
788 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
789 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
792 config PHYSICAL_ALIGN
794 default "0x10000000" if FSL_BOOKE
796 This value puts the alignment restrictions on physical address
797 where kernel is loaded and run from. Kernel is compiled for an
798 address which meets above alignment restriction.
800 config TASK_SIZE_BOOL
801 bool "Set custom user task size"
802 depends on ADVANCED_OPTIONS
804 This option allows you to set the amount of virtual address space
805 allocated to user tasks. This can be useful in optimizing the
806 virtual memory layout of the system.
808 Say N here unless you know what you are doing.
811 hex "Size of user task space" if TASK_SIZE_BOOL
812 default "0x80000000" if PPC_PREP || PPC_8xx
815 config CONSISTENT_START_BOOL
816 bool "Set custom consistent memory pool address"
817 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
819 This option allows you to set the base virtual address
820 of the consistent memory pool. This pool of virtual
821 memory is used to make consistent memory allocations.
823 config CONSISTENT_START
824 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
825 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
826 default "0xff100000" if NOT_COHERENT_CACHE
828 config CONSISTENT_SIZE_BOOL
829 bool "Set custom consistent memory pool size"
830 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
832 This option allows you to set the size of the
833 consistent memory pool. This pool of virtual memory
834 is used to make consistent memory allocations.
836 config CONSISTENT_SIZE
837 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
838 default "0x00200000" if NOT_COHERENT_CACHE
841 bool "Pinned Kernel TLBs (860 ONLY)"
842 depends on ADVANCED_OPTIONS && 8xx
847 bool "Build a relocatable kernel"
849 This builds a kernel image that is capable of running anywhere
850 in the RMA (real memory area) at any 16k-aligned base address.
851 The kernel is linked as a position-independent executable (PIE)
852 and contains dynamic relocations which are processed early
853 in the bootup process.
855 One use is for the kexec on panic case where the recovery kernel
856 must live at a different physical address than the primary
861 default "0xc000000000000000"
864 default "0xc000000000000000"
865 config PHYSICAL_START
872 source "drivers/Kconfig"
876 # XXX source "arch/ppc/8xx_io/Kconfig"
878 # XXX source "arch/ppc/8260_io/Kconfig"
880 source "arch/powerpc/sysdev/qe_lib/Kconfig"
884 source "arch/powerpc/Kconfig.debug"
886 source "security/Kconfig"
890 depends on COMPAT && KEYS
893 source "crypto/Kconfig"
903 source "arch/powerpc/kvm/Kconfig"