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 GENERIC_HARDIRQS_NO__DO_IRQ
49 config HAVE_LEGACY_PER_CPU_AREA
52 config HAVE_SETUP_PER_CPU_AREA
59 config STACKTRACE_SUPPORT
63 config HAVE_LATENCYTOP_SUPPORT
66 config TRACE_IRQFLAGS_SUPPORT
71 config LOCKDEP_SUPPORT
75 config RWSEM_GENERIC_SPINLOCK
78 config RWSEM_XCHGADD_ALGORITHM
82 config GENERIC_LOCKBREAK
85 depends on SMP && PREEMPT
87 config ARCH_HAS_ILOG2_U32
91 config ARCH_HAS_ILOG2_U64
95 config GENERIC_HWEIGHT
99 config GENERIC_FIND_NEXT_BIT
106 Generic GPIO API support
108 config ARCH_NO_VIRT_TO_BUS
114 select HAVE_FTRACE_MCOUNT_RECORD
115 select HAVE_DYNAMIC_FTRACE
116 select HAVE_FUNCTION_TRACER
117 select HAVE_FUNCTION_GRAPH_TRACER
118 select ARCH_WANT_OPTIONAL_GPIOLIB
120 select HAVE_IOREMAP_PROT
121 select HAVE_EFFICIENT_UNALIGNED_ACCESS
123 select HAVE_ARCH_KGDB
124 select HAVE_KRETPROBES
125 select HAVE_ARCH_TRACEHOOK
127 select HAVE_DMA_ATTRS if PPC64
128 select USE_GENERIC_SMP_HELPERS if SMP
130 select HAVE_SYSCALL_WRAPPERS if PPC64
131 select GENERIC_ATOMIC64 if PPC32
132 select HAVE_PERF_COUNTERS
141 select COMPAT_BINFMT_ELF
143 config SYSVIPC_COMPAT
145 depends on COMPAT && SYSVIPC
148 # All PPC32s use generic nvram driver through ppc_md
153 config SCHED_OMIT_FRAME_POINTER
157 config ARCH_MAY_HAVE_PC_FDC
159 default !PPC_PSERIES || PCI
167 config PPC_UDBG_16550
171 config GENERIC_TBSYNC
173 default y if PPC32 && SMP
185 config SYS_SUPPORTS_APM_EMULATION
186 default y if PMAC_APM_EMU
193 config DEFAULT_UIMAGE
196 Used to allow a board to specify it wants a uImage built by default
204 depends on (PPC_PMAC && !SMP) || BROKEN
209 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
212 config ARCH_HIBERNATION_POSSIBLE
214 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
217 config ARCH_SUSPEND_POSSIBLE
219 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
221 config PPC_DCR_NATIVE
231 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
234 config PPC_OF_PLATFORM_PCI
237 depends on PPC64 # not supported on 32 bits yet
240 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
243 source "init/Kconfig"
245 source "kernel/Kconfig.freezer"
247 source "arch/powerpc/sysdev/Kconfig"
248 source "arch/powerpc/platforms/Kconfig"
250 menu "Kernel options"
253 bool "High memory support"
256 source kernel/time/Kconfig
257 source kernel/Kconfig.hz
258 source kernel/Kconfig.preempt
259 source "fs/Kconfig.binfmt"
261 config HUGETLB_PAGE_SIZE_VARIABLE
263 depends on HUGETLB_PAGE
266 config MATH_EMULATION
267 bool "Math emulation"
268 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
270 Some PowerPC chips designed for embedded applications do not have
271 a floating-point unit and therefore do not implement the
272 floating-point instructions in the PowerPC instruction set. If you
273 say Y here, the kernel will include code to emulate a floating-point
274 unit, which will allow programs that use floating-point
277 config 8XX_MINIMAL_FPEMU
278 bool "Minimal math emulation for 8xx"
279 depends on 8xx && !MATH_EMULATION
281 Older arch/ppc kernels still emulated a few floating point
282 instructions such as load and store, even when full math
283 emulation is disabled. Say "Y" here if you want to preserve
286 It is recommended that you build a soft-float userspace instead.
289 bool "Enable IOMMU virtual merging"
293 Cause IO segments sent to a device for DMA to be merged virtually
294 by the IOMMU when they happen to have been allocated contiguously.
295 This doesn't add pressure to the IOMMU allocator. However, some
296 drivers don't support getting large merged segments coming back
299 Most drivers don't have this problem; it is safe to say Y here.
305 bool "SWIOTLB support"
309 Support for IO bounce buffering for systems without an IOMMU.
310 This allows us to DMA to the full physical address space on
311 platforms where the size of a physical address is larger
312 than the bus address. Not all platforms support this.
314 config PPC_NEED_DMA_SYNC_OPS
316 depends on (NOT_COHERENT_CACHE || SWIOTLB)
319 bool "Support for enabling/disabling CPUs"
320 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
322 Say Y here to be able to disable and re-enable individual
323 CPUs at runtime on SMP machines.
325 Say N if you are unsure.
327 config ARCH_ENABLE_MEMORY_HOTPLUG
330 config ARCH_HAS_WALK_MEMORY
333 config ARCH_ENABLE_MEMORY_HOTREMOVE
337 bool "kexec system call (EXPERIMENTAL)"
338 depends on PPC_BOOK3S && EXPERIMENTAL
340 kexec is a system call that implements the ability to shutdown your
341 current kernel, and to start another kernel. It is like a reboot
342 but it is independent of the system firmware. And like a reboot
343 you can start any kernel with it, not just Linux.
345 The name comes from the similarity to the exec system call.
347 It is an ongoing process to be certain the hardware in a machine
348 is properly shutdown, so do not be surprised if this code does not
349 initially work for you. It may help to enable device hotplugging
350 support. As of this writing the exact hardware interface is
351 strongly in flux, so no good recommendation can be made.
354 bool "Build a kdump crash kernel"
355 depends on PPC64 || 6xx
356 select RELOCATABLE if PPC64
358 Build a kernel suitable for use as a kdump capture kernel.
359 The same kernel binary can be used as production kernel and dump
363 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
364 depends on PPC_PSERIES && EXPERIMENTAL
366 Hypervisor-assisted dump is meant to be a kdump replacement
367 offering robustness and speed not possible without system
368 hypervisor assistance.
373 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
374 default y if PPC_PREP
377 bool "Distribute interrupts on all CPUs by default"
378 depends on SMP && !MV64360
380 This option gives the kernel permission to distribute IRQs across
381 multiple CPUs. Saying N here will route all IRQs to the first
382 CPU. Generally saying Y is safe, although some problems have been
383 reported with SMP Power Macintoshes with this option enabled.
388 default y if SMP && PPC_PSERIES
393 depends on NEED_MULTIPLE_NODES
395 config ARCH_SELECT_MEMORY_MODEL
399 config ARCH_FLATMEM_ENABLE
401 depends on (PPC64 && !NUMA) || PPC32
403 config ARCH_SPARSEMEM_ENABLE
406 select SPARSEMEM_VMEMMAP_ENABLE
408 config ARCH_SPARSEMEM_DEFAULT
410 depends on (SMP && PPC_PSERIES) || PPC_PS3
412 config ARCH_POPULATES_NODE_MAP
417 config ARCH_MEMORY_PROBE
419 depends on MEMORY_HOTPLUG
421 # Some NUMA nodes have memory ranges that span
422 # other nodes. Even though a pfn is valid and
423 # between a node's start and end pfns, it may not
424 # reside on that node. See memmap_init_zone()
426 config NODES_SPAN_OTHER_NODES
428 depends on NEED_MULTIPLE_NODES
430 config PPC_HAS_HASH_64K
436 bool "Using standard binutils settings"
440 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
441 Note, that kernel will be able to run only those applications,
442 which had been compiled using binutils later than 2.17.50.0.3 with
443 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
444 the older binutils, you can patch them with a trivial patch, which
445 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
451 Select the kernel logical page size. Increasing the page size
452 will reduce software overhead at each page boundary, allow
453 hardware prefetch mechanisms to be more effective, and allow
454 larger dma transfers increasing IO efficiency and reducing
455 overhead. However the utilization of memory will increase.
456 For example, each cached file will using a multiple of the
457 page size to hold its contents and the difference between the
458 end of file and the end of page is wasted.
460 Some dedicated systems, such as software raid serving with
461 accelerated calculations, have shown significant increases.
463 If you configure a 64 bit kernel for 64k pages but the
464 processor does not support them, then the kernel will simulate
465 them with 4k pages, loading them on demand, but with the
466 reduced software overhead and larger internal fragmentation.
467 For the 32 bit kernel, a large page option will not be offered
468 unless it is supported by the configured processor.
470 If unsure, choose 4K_PAGES.
476 bool "16k page size" if 44x
479 bool "64k page size" if 44x || PPC_STD_MMU_64
480 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
482 config PPC_256K_PAGES
483 bool "256k page size" if 44x
484 depends on !STDBINUTILS
486 Make the page size 256k.
488 As the ELF standard only requires alignment to support page
489 sizes up to 64k, you will need to compile all of your user
490 space applications with a non-standard binutils settings
491 (see the STDBINUTILS description for details).
493 Say N unless you know what you are doing.
497 config FORCE_MAX_ZONEORDER
498 int "Maximum zone order"
499 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
500 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
501 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
502 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
503 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
504 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
505 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
506 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
507 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
508 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
512 The kernel memory allocator divides physically contiguous memory
513 blocks into "zones", where each zone is a power of two number of
514 pages. This option selects the largest power of two that the kernel
515 keeps in the memory allocator. If you need to allocate very large
516 blocks of physically contiguous memory, then you may need to
519 This config option is actually maximum order plus one. For example,
520 a value of 11 means that the largest free memory block is 2^10 pages.
522 The page size is not necessarily 4KB. For example, on 64-bit
523 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
524 this in mind when choosing a value for this option.
526 config PPC_SUBPAGE_PROT
527 bool "Support setting protections for 4k subpages"
528 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
530 This option adds support for a system call to allow user programs
531 to set access permissions (read/write, readonly, or no access)
532 on the 4k subpages of each 64k page.
535 bool "SMT (Hyperthreading) scheduler support"
536 depends on PPC64 && SMP
538 SMT scheduler support improves the CPU scheduler's decision making
539 when dealing with POWER5 cpus at a cost of slightly increased
540 overhead in some places. If unsure say N here.
542 config PROC_DEVICETREE
543 bool "Support for device tree in /proc"
546 This option adds a device-tree directory under /proc which contains
547 an image of the device tree that the kernel copies from Open
548 Firmware or other boot firmware. If unsure, say Y here.
551 bool "Default bootloader kernel arguments"
554 string "Initial kernel command string"
555 depends on CMDLINE_BOOL
556 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
558 On some platforms, there is currently no way for the boot loader to
559 pass arguments to the kernel. For these platforms, you can supply
560 some command-line options at build time by entering them here. In
561 most cases you will need to specify the root device here.
564 string "Additional default image types"
566 List additional targets to be built by the bootwrapper here (separated
567 by spaces). This is useful for targets that depend of device tree
568 files in the .dts directory.
570 Targets in this list will be build as part of the default build
571 target, or when the user does a 'make zImage' or a
572 'make zImage.initrd'.
574 If unsure, leave blank
577 config ARCH_WANTS_FREEZER_CONTROL
581 source kernel/power/Kconfig
585 bool "Enable seccomp to safely compute untrusted bytecode"
589 This kernel feature is useful for number crunching applications
590 that may need to compute untrusted bytecode during their
591 execution. By using pipes or other transports made available to
592 the process as file descriptors supporting the read/write
593 syscalls, it's possible to isolate those applications in
594 their own address space using seccomp. Once seccomp is
595 enabled via /proc/<pid>/seccomp, it cannot be disabled
596 and the task is only allowed to execute a few safe syscalls
597 defined by each seccomp mode.
599 If unsure, say Y. Only embedded should say N here.
605 default !PPC_ISERIES || PCI
610 bool "Support for ISA-bus hardware"
611 depends on PPC_PREP || PPC_CHRP
614 Find out whether you have ISA slots on your motherboard. ISA is the
615 name of a bus system, i.e. the way the CPU talks to the other stuff
616 inside your box. If you have an Apple machine, say N here; if you
617 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
618 you have an embedded board, consult your board documentation.
624 config GENERIC_ISA_DMA
626 depends on PPC64 || POWER4 || 6xx && !CPM2
629 config PPC_INDIRECT_PCI
632 default y if 40x || 44x
646 select PPC_INDIRECT_PCI
655 Freescale Localbus support
659 depends on PPC_83xx || QUICC_ENGINE || CPM2
661 Freescale General-purpose Timers support
663 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
667 # Platforms that what PCI turned unconditionally just do select PCI
668 # in their config node. Platforms that want to choose at config
669 # time should select PPC_PCI_CHOICE
670 config PPC_PCI_CHOICE
674 bool "PCI support" if PPC_PCI_CHOICE
675 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
676 && !PPC_85xx && !PPC_86xx
677 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
678 default PCI_QSPAN if !4xx && !CPM2 && 8xx
679 select ARCH_SUPPORTS_MSI
681 Find out whether your system includes a PCI bus. PCI is the name of
682 a bus system, i.e. the way the CPU talks to the other stuff inside
683 your box. If you say Y here, the kernel will include drivers and
684 infrastructure code to support PCI bus devices.
694 depends on !4xx && !CPM2 && 8xx
697 Say Y here if you have a system based on a Motorola 8xx-series
698 embedded processor with a QSPAN PCI interface, otherwise say N.
702 depends on PCI && 8260
703 select PPC_INDIRECT_PCI
707 bool "Enable workaround for MPC826x erratum PCI 9"
708 depends on PCI_8260 && !8272
712 prompt "IDMA channel for PCI 9 workaround"
715 config 8260_PCI9_IDMA1
718 config 8260_PCI9_IDMA2
721 config 8260_PCI9_IDMA3
724 config 8260_PCI9_IDMA4
729 source "drivers/pci/pcie/Kconfig"
731 source "drivers/pci/Kconfig"
733 source "drivers/pcmcia/Kconfig"
735 source "drivers/pci/hotplug/Kconfig"
742 bool "RapidIO support"
743 depends on HAS_RAPIDIO
745 If you say Y here, the kernel will include drivers and
746 infrastructure code to support RapidIO interconnect devices.
748 source "drivers/rapidio/Kconfig"
752 menu "Advanced setup"
755 config ADVANCED_OPTIONS
756 bool "Prompt for advanced kernel configuration options"
758 This option will enable prompting for a variety of advanced kernel
759 configuration options. These options can cause the kernel to not
760 work if they are set incorrectly, but can be used to optimize certain
761 aspects of kernel memory management.
763 Unless you know what you are doing, say N here.
765 comment "Default settings for advanced configuration options are used"
766 depends on !ADVANCED_OPTIONS
768 config LOWMEM_SIZE_BOOL
769 bool "Set maximum low memory"
770 depends on ADVANCED_OPTIONS
772 This option allows you to set the maximum amount of memory which
773 will be used as "low memory", that is, memory which the kernel can
774 access directly, without having to set up a kernel virtual mapping.
775 This can be useful in optimizing the layout of kernel virtual
778 Say N here unless you know what you are doing.
781 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
784 config LOWMEM_CAM_NUM_BOOL
785 bool "Set number of CAMs to use to map low memory"
786 depends on ADVANCED_OPTIONS && FSL_BOOKE
788 This option allows you to set the maximum number of CAM slots that
789 will be used to map low memory. There are a limited number of slots
790 available and even more limited number that will fit in the L1 MMU.
791 However, using more entries will allow mapping more low memory. This
792 can be useful in optimizing the layout of kernel virtual memory.
794 Say N here unless you know what you are doing.
796 config LOWMEM_CAM_NUM
798 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
802 bool "Build a relocatable kernel (EXPERIMENTAL)"
803 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
805 This builds a kernel image that is capable of running at the
806 location the kernel is loaded at (some alignment restrictions may
809 One use is for the kexec on panic case where the recovery kernel
810 must live at a different physical address than the primary
813 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
814 it has been loaded at and the compile time physical addresses
815 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
816 setting can still be useful to bootwrappers that need to know the
817 load location of the kernel (eg. u-boot/mkimage).
819 config PAGE_OFFSET_BOOL
820 bool "Set custom page offset address"
821 depends on ADVANCED_OPTIONS
823 This option allows you to set the kernel virtual address at which
824 the kernel will map low memory. This can be useful in optimizing
825 the virtual memory layout of the system.
827 Say N here unless you know what you are doing.
830 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
833 config KERNEL_START_BOOL
834 bool "Set custom kernel base address"
835 depends on ADVANCED_OPTIONS
837 This option allows you to set the kernel virtual address at which
838 the kernel will be loaded. Normally this should match PAGE_OFFSET
839 however there are times (like kdump) that one might not want them
842 Say N here unless you know what you are doing.
845 hex "Virtual address of kernel base" if KERNEL_START_BOOL
846 default PAGE_OFFSET if PAGE_OFFSET_BOOL
847 default "0xc2000000" if CRASH_DUMP
850 config PHYSICAL_START_BOOL
851 bool "Set physical address where the kernel is loaded"
852 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
854 This gives the physical address where the kernel is loaded.
856 Say N here unless you know what you are doing.
858 config PHYSICAL_START
859 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
860 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
863 config PHYSICAL_ALIGN
865 default "0x04000000" if FSL_BOOKE
867 This value puts the alignment restrictions on physical address
868 where kernel is loaded and run from. Kernel is compiled for an
869 address which meets above alignment restriction.
871 config TASK_SIZE_BOOL
872 bool "Set custom user task size"
873 depends on ADVANCED_OPTIONS
875 This option allows you to set the amount of virtual address space
876 allocated to user tasks. This can be useful in optimizing the
877 virtual memory layout of the system.
879 Say N here unless you know what you are doing.
882 hex "Size of user task space" if TASK_SIZE_BOOL
883 default "0x80000000" if PPC_PREP || PPC_8xx
886 config CONSISTENT_SIZE_BOOL
887 bool "Set custom consistent memory pool size"
888 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
890 This option allows you to set the size of the
891 consistent memory pool. This pool of virtual memory
892 is used to make consistent memory allocations.
894 config CONSISTENT_SIZE
895 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
896 default "0x00200000" if NOT_COHERENT_CACHE
899 bool "Pinned Kernel TLBs (860 ONLY)"
900 depends on ADVANCED_OPTIONS && 8xx
905 bool "Build a relocatable kernel"
907 This builds a kernel image that is capable of running anywhere
908 in the RMA (real memory area) at any 16k-aligned base address.
909 The kernel is linked as a position-independent executable (PIE)
910 and contains dynamic relocations which are processed early
911 in the bootup process.
913 One use is for the kexec on panic case where the recovery kernel
914 must live at a different physical address than the primary
919 default "0xc000000000000000"
922 default "0xc000000000000000"
923 config PHYSICAL_START
930 source "drivers/Kconfig"
934 source "arch/powerpc/sysdev/qe_lib/Kconfig"
938 source "arch/powerpc/Kconfig.debug"
940 source "security/Kconfig"
944 depends on COMPAT && KEYS
947 source "crypto/Kconfig"
957 source "arch/powerpc/kvm/Kconfig"