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_SETUP_PER_CPU_AREA
52 config NEED_PER_CPU_EMBED_FIRST_CHUNK
59 config STACKTRACE_SUPPORT
63 config HAVE_LATENCYTOP_SUPPORT
66 config TRACE_IRQFLAGS_SUPPORT
70 config LOCKDEP_SUPPORT
74 config RWSEM_GENERIC_SPINLOCK
77 config RWSEM_XCHGADD_ALGORITHM
81 config GENERIC_LOCKBREAK
84 depends on SMP && PREEMPT
86 config ARCH_HAS_ILOG2_U32
90 config ARCH_HAS_ILOG2_U64
94 config GENERIC_HWEIGHT
98 config GENERIC_FIND_NEXT_BIT
105 Generic GPIO API support
107 config ARCH_NO_VIRT_TO_BUS
113 select HAVE_FTRACE_MCOUNT_RECORD
114 select HAVE_DYNAMIC_FTRACE
115 select HAVE_FUNCTION_TRACER
116 select HAVE_FUNCTION_GRAPH_TRACER
117 select ARCH_WANT_OPTIONAL_GPIOLIB
119 select HAVE_IOREMAP_PROT
120 select HAVE_EFFICIENT_UNALIGNED_ACCESS
122 select HAVE_ARCH_KGDB
123 select HAVE_KRETPROBES
124 select HAVE_ARCH_TRACEHOOK
126 select HAVE_DMA_ATTRS
127 select HAVE_DMA_API_DEBUG
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_EVENTS
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
168 config PPC_UDBG_16550
172 config GENERIC_TBSYNC
174 default y if PPC32 && SMP
186 config SYS_SUPPORTS_APM_EMULATION
187 default y if PMAC_APM_EMU
194 config DEFAULT_UIMAGE
197 Used to allow a board to specify it wants a uImage built by default
205 depends on (PPC_PMAC && !SMP) || BROKEN
210 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
213 config ARCH_HIBERNATION_POSSIBLE
215 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
218 config ARCH_SUSPEND_POSSIBLE
220 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
222 config PPC_DCR_NATIVE
232 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
235 config PPC_OF_PLATFORM_PCI
238 depends on PPC64 # not supported on 32 bits yet
241 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
244 source "init/Kconfig"
246 source "kernel/Kconfig.freezer"
248 source "arch/powerpc/sysdev/Kconfig"
249 source "arch/powerpc/platforms/Kconfig"
251 menu "Kernel options"
254 bool "High memory support"
257 source kernel/time/Kconfig
258 source kernel/Kconfig.hz
259 source kernel/Kconfig.preempt
260 source "fs/Kconfig.binfmt"
262 config HUGETLB_PAGE_SIZE_VARIABLE
264 depends on HUGETLB_PAGE
267 config MATH_EMULATION
268 bool "Math emulation"
269 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
271 Some PowerPC chips designed for embedded applications do not have
272 a floating-point unit and therefore do not implement the
273 floating-point instructions in the PowerPC instruction set. If you
274 say Y here, the kernel will include code to emulate a floating-point
275 unit, which will allow programs that use floating-point
278 config 8XX_MINIMAL_FPEMU
279 bool "Minimal math emulation for 8xx"
280 depends on 8xx && !MATH_EMULATION
282 Older arch/ppc kernels still emulated a few floating point
283 instructions such as load and store, even when full math
284 emulation is disabled. Say "Y" here if you want to preserve
287 It is recommended that you build a soft-float userspace instead.
290 bool "Enable IOMMU virtual merging"
294 Cause IO segments sent to a device for DMA to be merged virtually
295 by the IOMMU when they happen to have been allocated contiguously.
296 This doesn't add pressure to the IOMMU allocator. However, some
297 drivers don't support getting large merged segments coming back
300 Most drivers don't have this problem; it is safe to say Y here.
306 bool "SWIOTLB support"
310 Support for IO bounce buffering for systems without an IOMMU.
311 This allows us to DMA to the full physical address space on
312 platforms where the size of a physical address is larger
313 than the bus address. Not all platforms support this.
316 bool "Support for enabling/disabling CPUs"
317 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
319 Say Y here to be able to disable and re-enable individual
320 CPUs at runtime on SMP machines.
322 Say N if you are unsure.
324 config ARCH_ENABLE_MEMORY_HOTPLUG
327 config ARCH_HAS_WALK_MEMORY
330 config ARCH_ENABLE_MEMORY_HOTREMOVE
334 bool "kexec system call (EXPERIMENTAL)"
335 depends on PPC_BOOK3S && EXPERIMENTAL
337 kexec is a system call that implements the ability to shutdown your
338 current kernel, and to start another kernel. It is like a reboot
339 but it is independent of the system firmware. And like a reboot
340 you can start any kernel with it, not just Linux.
342 The name comes from the similarity to the exec system call.
344 It is an ongoing process to be certain the hardware in a machine
345 is properly shutdown, so do not be surprised if this code does not
346 initially work for you. It may help to enable device hotplugging
347 support. As of this writing the exact hardware interface is
348 strongly in flux, so no good recommendation can be made.
351 bool "Build a kdump crash kernel"
352 depends on PPC64 || 6xx
353 select RELOCATABLE if PPC64
355 Build a kernel suitable for use as a kdump capture kernel.
356 The same kernel binary can be used as production kernel and dump
360 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
361 depends on PPC_PSERIES && EXPERIMENTAL
363 Hypervisor-assisted dump is meant to be a kdump replacement
364 offering robustness and speed not possible without system
365 hypervisor assistance.
370 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
371 default y if PPC_PREP
374 bool "Distribute interrupts on all CPUs by default"
375 depends on SMP && !MV64360
377 This option gives the kernel permission to distribute IRQs across
378 multiple CPUs. Saying N here will route all IRQs to the first
379 CPU. Generally saying Y is safe, although some problems have been
380 reported with SMP Power Macintoshes with this option enabled.
385 default y if SMP && PPC_PSERIES
391 depends on NEED_MULTIPLE_NODES
393 config MAX_ACTIVE_REGIONS
395 default "256" if PPC64
398 config ARCH_SELECT_MEMORY_MODEL
402 config ARCH_FLATMEM_ENABLE
404 depends on (PPC64 && !NUMA) || PPC32
406 config ARCH_SPARSEMEM_ENABLE
409 select SPARSEMEM_VMEMMAP_ENABLE
411 config ARCH_SPARSEMEM_DEFAULT
413 depends on (SMP && PPC_PSERIES) || PPC_PS3
415 config ARCH_POPULATES_NODE_MAP
418 config SYS_SUPPORTS_HUGETLBFS
420 depends on PPC_BOOK3S_64
424 config ARCH_MEMORY_PROBE
426 depends on MEMORY_HOTPLUG
428 # Some NUMA nodes have memory ranges that span
429 # other nodes. Even though a pfn is valid and
430 # between a node's start and end pfns, it may not
431 # reside on that node. See memmap_init_zone()
433 config NODES_SPAN_OTHER_NODES
435 depends on NEED_MULTIPLE_NODES
437 config PPC_HAS_HASH_64K
443 bool "Using standard binutils settings"
447 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
448 Note, that kernel will be able to run only those applications,
449 which had been compiled using binutils later than 2.17.50.0.3 with
450 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
451 the older binutils, you can patch them with a trivial patch, which
452 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
458 Select the kernel logical page size. Increasing the page size
459 will reduce software overhead at each page boundary, allow
460 hardware prefetch mechanisms to be more effective, and allow
461 larger dma transfers increasing IO efficiency and reducing
462 overhead. However the utilization of memory will increase.
463 For example, each cached file will using a multiple of the
464 page size to hold its contents and the difference between the
465 end of file and the end of page is wasted.
467 Some dedicated systems, such as software raid serving with
468 accelerated calculations, have shown significant increases.
470 If you configure a 64 bit kernel for 64k pages but the
471 processor does not support them, then the kernel will simulate
472 them with 4k pages, loading them on demand, but with the
473 reduced software overhead and larger internal fragmentation.
474 For the 32 bit kernel, a large page option will not be offered
475 unless it is supported by the configured processor.
477 If unsure, choose 4K_PAGES.
483 bool "16k page size" if 44x
486 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
487 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
489 config PPC_256K_PAGES
490 bool "256k page size" if 44x
491 depends on !STDBINUTILS
493 Make the page size 256k.
495 As the ELF standard only requires alignment to support page
496 sizes up to 64k, you will need to compile all of your user
497 space applications with a non-standard binutils settings
498 (see the STDBINUTILS description for details).
500 Say N unless you know what you are doing.
504 config FORCE_MAX_ZONEORDER
505 int "Maximum zone order"
506 range 9 64 if PPC64 && PPC_64K_PAGES
507 default "9" if PPC64 && PPC_64K_PAGES
508 range 13 64 if PPC64 && !PPC_64K_PAGES
509 default "13" if PPC64 && !PPC_64K_PAGES
510 range 9 64 if PPC32 && PPC_16K_PAGES
511 default "9" if PPC32 && PPC_16K_PAGES
512 range 7 64 if PPC32 && PPC_64K_PAGES
513 default "7" if PPC32 && PPC_64K_PAGES
514 range 5 64 if PPC32 && PPC_256K_PAGES
515 default "5" if PPC32 && PPC_256K_PAGES
519 The kernel memory allocator divides physically contiguous memory
520 blocks into "zones", where each zone is a power of two number of
521 pages. This option selects the largest power of two that the kernel
522 keeps in the memory allocator. If you need to allocate very large
523 blocks of physically contiguous memory, then you may need to
526 This config option is actually maximum order plus one. For example,
527 a value of 11 means that the largest free memory block is 2^10 pages.
529 The page size is not necessarily 4KB. For example, on 64-bit
530 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
531 this in mind when choosing a value for this option.
533 config PPC_SUBPAGE_PROT
534 bool "Support setting protections for 4k subpages"
535 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
537 This option adds support for a system call to allow user programs
538 to set access permissions (read/write, readonly, or no access)
539 on the 4k subpages of each 64k page.
542 bool "SMT (Hyperthreading) scheduler support"
543 depends on PPC64 && SMP
545 SMT scheduler support improves the CPU scheduler's decision making
546 when dealing with POWER5 cpus at a cost of slightly increased
547 overhead in some places. If unsure say N here.
549 config PROC_DEVICETREE
550 bool "Support for device tree in /proc"
553 This option adds a device-tree directory under /proc which contains
554 an image of the device tree that the kernel copies from Open
555 Firmware or other boot firmware. If unsure, say Y here.
558 bool "Default bootloader kernel arguments"
561 string "Initial kernel command string"
562 depends on CMDLINE_BOOL
563 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
565 On some platforms, there is currently no way for the boot loader to
566 pass arguments to the kernel. For these platforms, you can supply
567 some command-line options at build time by entering them here. In
568 most cases you will need to specify the root device here.
571 string "Additional default image types"
573 List additional targets to be built by the bootwrapper here (separated
574 by spaces). This is useful for targets that depend of device tree
575 files in the .dts directory.
577 Targets in this list will be build as part of the default build
578 target, or when the user does a 'make zImage' or a
579 'make zImage.initrd'.
581 If unsure, leave blank
584 config ARCH_WANTS_FREEZER_CONTROL
588 source kernel/power/Kconfig
592 bool "Enable seccomp to safely compute untrusted bytecode"
596 This kernel feature is useful for number crunching applications
597 that may need to compute untrusted bytecode during their
598 execution. By using pipes or other transports made available to
599 the process as file descriptors supporting the read/write
600 syscalls, it's possible to isolate those applications in
601 their own address space using seccomp. Once seccomp is
602 enabled via /proc/<pid>/seccomp, it cannot be disabled
603 and the task is only allowed to execute a few safe syscalls
604 defined by each seccomp mode.
606 If unsure, say Y. Only embedded should say N here.
612 default !PPC_ISERIES || PCI
617 bool "Support for ISA-bus hardware"
618 depends on PPC_PREP || PPC_CHRP
621 Find out whether you have ISA slots on your motherboard. ISA is the
622 name of a bus system, i.e. the way the CPU talks to the other stuff
623 inside your box. If you have an Apple machine, say N here; if you
624 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
625 you have an embedded board, consult your board documentation.
631 config GENERIC_ISA_DMA
633 depends on PPC64 || POWER4 || 6xx && !CPM2
636 config PPC_INDIRECT_PCI
639 default y if 40x || 44x
653 select PPC_INDIRECT_PCI
662 Freescale Localbus support
666 depends on PPC_83xx || QUICC_ENGINE || CPM2
668 Freescale General-purpose Timers support
670 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
674 # Platforms that what PCI turned unconditionally just do select PCI
675 # in their config node. Platforms that want to choose at config
676 # time should select PPC_PCI_CHOICE
677 config PPC_PCI_CHOICE
681 bool "PCI support" if PPC_PCI_CHOICE
682 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
683 && !PPC_85xx && !PPC_86xx
684 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
685 default PCI_QSPAN if !4xx && !CPM2 && 8xx
686 select ARCH_SUPPORTS_MSI
688 Find out whether your system includes a PCI bus. PCI is the name of
689 a bus system, i.e. the way the CPU talks to the other stuff inside
690 your box. If you say Y here, the kernel will include drivers and
691 infrastructure code to support PCI bus devices.
701 depends on !4xx && !CPM2 && 8xx
704 Say Y here if you have a system based on a Motorola 8xx-series
705 embedded processor with a QSPAN PCI interface, otherwise say N.
709 depends on PCI && 8260
710 select PPC_INDIRECT_PCI
714 bool "Enable workaround for MPC826x erratum PCI 9"
715 depends on PCI_8260 && !8272
719 prompt "IDMA channel for PCI 9 workaround"
722 config 8260_PCI9_IDMA1
725 config 8260_PCI9_IDMA2
728 config 8260_PCI9_IDMA3
731 config 8260_PCI9_IDMA4
736 source "drivers/pci/pcie/Kconfig"
738 source "drivers/pci/Kconfig"
740 source "drivers/pcmcia/Kconfig"
742 source "drivers/pci/hotplug/Kconfig"
749 bool "RapidIO support"
750 depends on HAS_RAPIDIO
752 If you say Y here, the kernel will include drivers and
753 infrastructure code to support RapidIO interconnect devices.
755 source "drivers/rapidio/Kconfig"
759 menu "Advanced setup"
762 config ADVANCED_OPTIONS
763 bool "Prompt for advanced kernel configuration options"
765 This option will enable prompting for a variety of advanced kernel
766 configuration options. These options can cause the kernel to not
767 work if they are set incorrectly, but can be used to optimize certain
768 aspects of kernel memory management.
770 Unless you know what you are doing, say N here.
772 comment "Default settings for advanced configuration options are used"
773 depends on !ADVANCED_OPTIONS
775 config LOWMEM_SIZE_BOOL
776 bool "Set maximum low memory"
777 depends on ADVANCED_OPTIONS
779 This option allows you to set the maximum amount of memory which
780 will be used as "low memory", that is, memory which the kernel can
781 access directly, without having to set up a kernel virtual mapping.
782 This can be useful in optimizing the layout of kernel virtual
785 Say N here unless you know what you are doing.
788 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
791 config LOWMEM_CAM_NUM_BOOL
792 bool "Set number of CAMs to use to map low memory"
793 depends on ADVANCED_OPTIONS && FSL_BOOKE
795 This option allows you to set the maximum number of CAM slots that
796 will be used to map low memory. There are a limited number of slots
797 available and even more limited number that will fit in the L1 MMU.
798 However, using more entries will allow mapping more low memory. This
799 can be useful in optimizing the layout of kernel virtual memory.
801 Say N here unless you know what you are doing.
803 config LOWMEM_CAM_NUM
805 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
809 bool "Build a relocatable kernel (EXPERIMENTAL)"
810 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
812 This builds a kernel image that is capable of running at the
813 location the kernel is loaded at (some alignment restrictions may
816 One use is for the kexec on panic case where the recovery kernel
817 must live at a different physical address than the primary
820 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
821 it has been loaded at and the compile time physical addresses
822 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
823 setting can still be useful to bootwrappers that need to know the
824 load location of the kernel (eg. u-boot/mkimage).
826 config PAGE_OFFSET_BOOL
827 bool "Set custom page offset address"
828 depends on ADVANCED_OPTIONS
830 This option allows you to set the kernel virtual address at which
831 the kernel will map low memory. This can be useful in optimizing
832 the virtual memory layout of the system.
834 Say N here unless you know what you are doing.
837 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
840 config KERNEL_START_BOOL
841 bool "Set custom kernel base address"
842 depends on ADVANCED_OPTIONS
844 This option allows you to set the kernel virtual address at which
845 the kernel will be loaded. Normally this should match PAGE_OFFSET
846 however there are times (like kdump) that one might not want them
849 Say N here unless you know what you are doing.
852 hex "Virtual address of kernel base" if KERNEL_START_BOOL
853 default PAGE_OFFSET if PAGE_OFFSET_BOOL
854 default "0xc2000000" if CRASH_DUMP
857 config PHYSICAL_START_BOOL
858 bool "Set physical address where the kernel is loaded"
859 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
861 This gives the physical address where the kernel is loaded.
863 Say N here unless you know what you are doing.
865 config PHYSICAL_START
866 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
867 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
870 config PHYSICAL_ALIGN
872 default "0x04000000" if FSL_BOOKE
874 This value puts the alignment restrictions on physical address
875 where kernel is loaded and run from. Kernel is compiled for an
876 address which meets above alignment restriction.
878 config TASK_SIZE_BOOL
879 bool "Set custom user task size"
880 depends on ADVANCED_OPTIONS
882 This option allows you to set the amount of virtual address space
883 allocated to user tasks. This can be useful in optimizing the
884 virtual memory layout of the system.
886 Say N here unless you know what you are doing.
889 hex "Size of user task space" if TASK_SIZE_BOOL
890 default "0x80000000" if PPC_PREP || PPC_8xx
893 config CONSISTENT_SIZE_BOOL
894 bool "Set custom consistent memory pool size"
895 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
897 This option allows you to set the size of the
898 consistent memory pool. This pool of virtual memory
899 is used to make consistent memory allocations.
901 config CONSISTENT_SIZE
902 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
903 default "0x00200000" if NOT_COHERENT_CACHE
906 bool "Pinned Kernel TLBs (860 ONLY)"
907 depends on ADVANCED_OPTIONS && 8xx
912 bool "Build a relocatable kernel"
914 This builds a kernel image that is capable of running anywhere
915 in the RMA (real memory area) at any 16k-aligned base address.
916 The kernel is linked as a position-independent executable (PIE)
917 and contains dynamic relocations which are processed early
918 in the bootup process.
920 One use is for the kexec on panic case where the recovery kernel
921 must live at a different physical address than the primary
926 default "0xc000000000000000"
929 default "0xc000000000000000"
930 config PHYSICAL_START
937 source "drivers/Kconfig"
941 source "arch/powerpc/sysdev/qe_lib/Kconfig"
945 source "arch/powerpc/Kconfig.debug"
947 source "security/Kconfig"
951 depends on COMPAT && KEYS
954 source "crypto/Kconfig"
964 source "arch/powerpc/kvm/Kconfig"