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
60 int "Number of virtual interrupt numbers"
64 This defines the number of virtual interrupt numbers the kernel
65 can manage. Virtual interrupt numbers are what you see in
66 /proc/interrupts. If you configure your system to have too few,
67 drivers will fail to load or worse - handle with care.
69 config STACKTRACE_SUPPORT
73 config HAVE_LATENCYTOP_SUPPORT
76 config TRACE_IRQFLAGS_SUPPORT
80 config LOCKDEP_SUPPORT
84 config RWSEM_GENERIC_SPINLOCK
87 config RWSEM_XCHGADD_ALGORITHM
91 config GENERIC_LOCKBREAK
94 depends on SMP && PREEMPT
96 config ARCH_HAS_ILOG2_U32
100 config ARCH_HAS_ILOG2_U64
104 config GENERIC_HWEIGHT
108 config GENERIC_FIND_NEXT_BIT
115 Generic GPIO API support
117 config ARCH_NO_VIRT_TO_BUS
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_DYNAMIC_FTRACE
125 select HAVE_FUNCTION_TRACER
126 select HAVE_FUNCTION_GRAPH_TRACER
127 select ARCH_WANT_OPTIONAL_GPIOLIB
129 select HAVE_IOREMAP_PROT
130 select HAVE_EFFICIENT_UNALIGNED_ACCESS
132 select HAVE_ARCH_KGDB
133 select HAVE_KRETPROBES
134 select HAVE_ARCH_TRACEHOOK
136 select HAVE_DMA_ATTRS
137 select HAVE_DMA_API_DEBUG
138 select USE_GENERIC_SMP_HELPERS if SMP
140 select HAVE_SYSCALL_WRAPPERS if PPC64
141 select GENERIC_ATOMIC64 if PPC32
142 select HAVE_PERF_EVENTS
143 select HAVE_REGS_AND_STACK_ACCESS_API
152 select COMPAT_BINFMT_ELF
154 config SYSVIPC_COMPAT
156 depends on COMPAT && SYSVIPC
159 # All PPC32s use generic nvram driver through ppc_md
164 config SCHED_OMIT_FRAME_POINTER
168 config ARCH_MAY_HAVE_PC_FDC
170 default !PPC_PSERIES || PCI
179 config PPC_UDBG_16550
183 config GENERIC_TBSYNC
185 default y if PPC32 && SMP
197 config SYS_SUPPORTS_APM_EMULATION
198 default y if PMAC_APM_EMU
205 config DEFAULT_UIMAGE
208 Used to allow a board to specify it wants a uImage built by default
214 config ARCH_HIBERNATION_POSSIBLE
218 config ARCH_SUSPEND_POSSIBLE
220 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
223 config PPC_DCR_NATIVE
233 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
236 config PPC_OF_PLATFORM_PCI
239 depends on PPC64 # not supported on 32 bits yet
242 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
245 config PPC_ADV_DEBUG_REGS
247 depends on 40x || BOOKE
250 config PPC_ADV_DEBUG_IACS
252 depends on PPC_ADV_DEBUG_REGS
256 config PPC_ADV_DEBUG_DACS
258 depends on PPC_ADV_DEBUG_REGS
261 config PPC_ADV_DEBUG_DVCS
263 depends on PPC_ADV_DEBUG_REGS
267 config PPC_ADV_DEBUG_DAC_RANGE
269 depends on PPC_ADV_DEBUG_REGS && 44x
272 source "init/Kconfig"
274 source "kernel/Kconfig.freezer"
276 source "arch/powerpc/sysdev/Kconfig"
277 source "arch/powerpc/platforms/Kconfig"
279 menu "Kernel options"
282 bool "High memory support"
285 source kernel/time/Kconfig
286 source kernel/Kconfig.hz
287 source kernel/Kconfig.preempt
288 source "fs/Kconfig.binfmt"
290 config HUGETLB_PAGE_SIZE_VARIABLE
292 depends on HUGETLB_PAGE
295 config MATH_EMULATION
296 bool "Math emulation"
297 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
299 Some PowerPC chips designed for embedded applications do not have
300 a floating-point unit and therefore do not implement the
301 floating-point instructions in the PowerPC instruction set. If you
302 say Y here, the kernel will include code to emulate a floating-point
303 unit, which will allow programs that use floating-point
306 config 8XX_MINIMAL_FPEMU
307 bool "Minimal math emulation for 8xx"
308 depends on 8xx && !MATH_EMULATION
310 Older arch/ppc kernels still emulated a few floating point
311 instructions such as load and store, even when full math
312 emulation is disabled. Say "Y" here if you want to preserve
315 It is recommended that you build a soft-float userspace instead.
321 bool "SWIOTLB support"
325 Support for IO bounce buffering for systems without an IOMMU.
326 This allows us to DMA to the full physical address space on
327 platforms where the size of a physical address is larger
328 than the bus address. Not all platforms support this.
331 bool "Support for enabling/disabling CPUs"
332 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
334 Say Y here to be able to disable and re-enable individual
335 CPUs at runtime on SMP machines.
337 Say N if you are unsure.
339 config ARCH_CPU_PROBE_RELEASE
341 depends on HOTPLUG_CPU
343 config ARCH_ENABLE_MEMORY_HOTPLUG
346 config ARCH_HAS_WALK_MEMORY
349 config ARCH_ENABLE_MEMORY_HOTREMOVE
353 bool "kexec system call (EXPERIMENTAL)"
354 depends on (PPC_BOOK3S || (FSL_BOOKE && !SMP)) && EXPERIMENTAL
356 kexec is a system call that implements the ability to shutdown your
357 current kernel, and to start another kernel. It is like a reboot
358 but it is independent of the system firmware. And like a reboot
359 you can start any kernel with it, not just Linux.
361 The name comes from the similarity to the exec system call.
363 It is an ongoing process to be certain the hardware in a machine
364 is properly shutdown, so do not be surprised if this code does not
365 initially work for you. It may help to enable device hotplugging
366 support. As of this writing the exact hardware interface is
367 strongly in flux, so no good recommendation can be made.
370 bool "Build a kdump crash kernel"
371 depends on PPC64 || 6xx
372 select RELOCATABLE if PPC64
374 Build a kernel suitable for use as a kdump capture kernel.
375 The same kernel binary can be used as production kernel and dump
379 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
380 depends on PPC_PSERIES && EXPERIMENTAL
382 Hypervisor-assisted dump is meant to be a kdump replacement
383 offering robustness and speed not possible without system
384 hypervisor assistance.
389 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
390 default y if PPC_PREP
393 bool "Distribute interrupts on all CPUs by default"
394 depends on SMP && !MV64360
396 This option gives the kernel permission to distribute IRQs across
397 multiple CPUs. Saying N here will route all IRQs to the first
398 CPU. Generally saying Y is safe, although some problems have been
399 reported with SMP Power Macintoshes with this option enabled.
402 bool "Support sparse irq numbering"
405 This enables support for sparse irqs. This is useful for distro
406 kernels that want to define a high CONFIG_NR_CPUS value but still
407 want to have low kernel memory footprint on smaller machines.
409 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
410 out the irq_desc[] array in a more NUMA-friendly way. )
412 If you don't know what to do here, say N.
417 default y if SMP && PPC_PSERIES
423 depends on NEED_MULTIPLE_NODES
425 config MAX_ACTIVE_REGIONS
427 default "256" if PPC64
430 config ARCH_SELECT_MEMORY_MODEL
434 config ARCH_FLATMEM_ENABLE
436 depends on (PPC64 && !NUMA) || PPC32
438 config ARCH_SPARSEMEM_ENABLE
441 select SPARSEMEM_VMEMMAP_ENABLE
443 config ARCH_SPARSEMEM_DEFAULT
445 depends on (SMP && PPC_PSERIES) || PPC_PS3
447 config ARCH_POPULATES_NODE_MAP
450 config SYS_SUPPORTS_HUGETLBFS
452 depends on PPC_BOOK3S_64
456 config ARCH_MEMORY_PROBE
458 depends on MEMORY_HOTPLUG
460 # Some NUMA nodes have memory ranges that span
461 # other nodes. Even though a pfn is valid and
462 # between a node's start and end pfns, it may not
463 # reside on that node. See memmap_init_zone()
465 config NODES_SPAN_OTHER_NODES
467 depends on NEED_MULTIPLE_NODES
469 config PPC_HAS_HASH_64K
475 bool "Using standard binutils settings"
479 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
480 Note, that kernel will be able to run only those applications,
481 which had been compiled using binutils later than 2.17.50.0.3 with
482 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
483 the older binutils, you can patch them with a trivial patch, which
484 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
490 Select the kernel logical page size. Increasing the page size
491 will reduce software overhead at each page boundary, allow
492 hardware prefetch mechanisms to be more effective, and allow
493 larger dma transfers increasing IO efficiency and reducing
494 overhead. However the utilization of memory will increase.
495 For example, each cached file will using a multiple of the
496 page size to hold its contents and the difference between the
497 end of file and the end of page is wasted.
499 Some dedicated systems, such as software raid serving with
500 accelerated calculations, have shown significant increases.
502 If you configure a 64 bit kernel for 64k pages but the
503 processor does not support them, then the kernel will simulate
504 them with 4k pages, loading them on demand, but with the
505 reduced software overhead and larger internal fragmentation.
506 For the 32 bit kernel, a large page option will not be offered
507 unless it is supported by the configured processor.
509 If unsure, choose 4K_PAGES.
515 bool "16k page size" if 44x
518 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
519 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
521 config PPC_256K_PAGES
522 bool "256k page size" if 44x
523 depends on !STDBINUTILS
525 Make the page size 256k.
527 As the ELF standard only requires alignment to support page
528 sizes up to 64k, you will need to compile all of your user
529 space applications with a non-standard binutils settings
530 (see the STDBINUTILS description for details).
532 Say N unless you know what you are doing.
536 config FORCE_MAX_ZONEORDER
537 int "Maximum zone order"
538 range 9 64 if PPC64 && PPC_64K_PAGES
539 default "9" if PPC64 && PPC_64K_PAGES
540 range 13 64 if PPC64 && !PPC_64K_PAGES
541 default "13" if PPC64 && !PPC_64K_PAGES
542 range 9 64 if PPC32 && PPC_16K_PAGES
543 default "9" if PPC32 && PPC_16K_PAGES
544 range 7 64 if PPC32 && PPC_64K_PAGES
545 default "7" if PPC32 && PPC_64K_PAGES
546 range 5 64 if PPC32 && PPC_256K_PAGES
547 default "5" if PPC32 && PPC_256K_PAGES
551 The kernel memory allocator divides physically contiguous memory
552 blocks into "zones", where each zone is a power of two number of
553 pages. This option selects the largest power of two that the kernel
554 keeps in the memory allocator. If you need to allocate very large
555 blocks of physically contiguous memory, then you may need to
558 This config option is actually maximum order plus one. For example,
559 a value of 11 means that the largest free memory block is 2^10 pages.
561 The page size is not necessarily 4KB. For example, on 64-bit
562 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
563 this in mind when choosing a value for this option.
565 config PPC_SUBPAGE_PROT
566 bool "Support setting protections for 4k subpages"
567 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
569 This option adds support for a system call to allow user programs
570 to set access permissions (read/write, readonly, or no access)
571 on the 4k subpages of each 64k page.
574 bool "SMT (Hyperthreading) scheduler support"
575 depends on PPC64 && SMP
577 SMT scheduler support improves the CPU scheduler's decision making
578 when dealing with POWER5 cpus at a cost of slightly increased
579 overhead in some places. If unsure say N here.
581 config PROC_DEVICETREE
582 bool "Support for device tree in /proc"
585 This option adds a device-tree directory under /proc which contains
586 an image of the device tree that the kernel copies from Open
587 Firmware or other boot firmware. If unsure, say Y here.
590 bool "Default bootloader kernel arguments"
593 string "Initial kernel command string"
594 depends on CMDLINE_BOOL
595 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
597 On some platforms, there is currently no way for the boot loader to
598 pass arguments to the kernel. For these platforms, you can supply
599 some command-line options at build time by entering them here. In
600 most cases you will need to specify the root device here.
603 string "Additional default image types"
605 List additional targets to be built by the bootwrapper here (separated
606 by spaces). This is useful for targets that depend of device tree
607 files in the .dts directory.
609 Targets in this list will be build as part of the default build
610 target, or when the user does a 'make zImage' or a
611 'make zImage.initrd'.
613 If unsure, leave blank
616 config ARCH_WANTS_FREEZER_CONTROL
620 source kernel/power/Kconfig
624 bool "Enable seccomp to safely compute untrusted bytecode"
628 This kernel feature is useful for number crunching applications
629 that may need to compute untrusted bytecode during their
630 execution. By using pipes or other transports made available to
631 the process as file descriptors supporting the read/write
632 syscalls, it's possible to isolate those applications in
633 their own address space using seccomp. Once seccomp is
634 enabled via /proc/<pid>/seccomp, it cannot be disabled
635 and the task is only allowed to execute a few safe syscalls
636 defined by each seccomp mode.
638 If unsure, say Y. Only embedded should say N here.
644 default !PPC_ISERIES || PCI
649 bool "Support for ISA-bus hardware"
650 depends on PPC_PREP || PPC_CHRP
653 Find out whether you have ISA slots on your motherboard. ISA is the
654 name of a bus system, i.e. the way the CPU talks to the other stuff
655 inside your box. If you have an Apple machine, say N here; if you
656 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
657 you have an embedded board, consult your board documentation.
663 config NEED_DMA_MAP_STATE
664 def_bool (PPC64 || NOT_COHERENT_CACHE)
666 config NEED_SG_DMA_LENGTH
669 config GENERIC_ISA_DMA
671 depends on PPC64 || POWER4 || 6xx && !CPM2
674 config PPC_INDIRECT_PCI
677 default y if 40x || 44x
691 select PPC_INDIRECT_PCI
697 depends on SUSPEND && (PPC_85xx || PPC_86xx)
699 Freescale MPC85xx/MPC86xx power management controller support
700 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
708 Freescale Localbus support
712 depends on PPC_83xx || QUICC_ENGINE || CPM2
714 Freescale General-purpose Timers support
716 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
720 # Platforms that what PCI turned unconditionally just do select PCI
721 # in their config node. Platforms that want to choose at config
722 # time should select PPC_PCI_CHOICE
723 config PPC_PCI_CHOICE
727 bool "PCI support" if PPC_PCI_CHOICE
728 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
729 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
730 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
731 default PCI_QSPAN if !4xx && !CPM2 && 8xx
732 select ARCH_SUPPORTS_MSI
734 Find out whether your system includes a PCI bus. PCI is the name of
735 a bus system, i.e. the way the CPU talks to the other stuff inside
736 your box. If you say Y here, the kernel will include drivers and
737 infrastructure code to support PCI bus devices.
747 depends on !4xx && !CPM2 && 8xx
750 Say Y here if you have a system based on a Motorola 8xx-series
751 embedded processor with a QSPAN PCI interface, otherwise say N.
755 depends on PCI && 8260
756 select PPC_INDIRECT_PCI
760 bool "Enable workaround for MPC826x erratum PCI 9"
761 depends on PCI_8260 && !8272
765 prompt "IDMA channel for PCI 9 workaround"
768 config 8260_PCI9_IDMA1
771 config 8260_PCI9_IDMA2
774 config 8260_PCI9_IDMA3
777 config 8260_PCI9_IDMA4
782 source "drivers/pci/pcie/Kconfig"
784 source "drivers/pci/Kconfig"
786 source "drivers/pcmcia/Kconfig"
788 source "drivers/pci/hotplug/Kconfig"
795 bool "RapidIO support"
796 depends on HAS_RAPIDIO
798 If you say Y here, the kernel will include drivers and
799 infrastructure code to support RapidIO interconnect devices.
801 source "drivers/rapidio/Kconfig"
805 menu "Advanced setup"
808 config ADVANCED_OPTIONS
809 bool "Prompt for advanced kernel configuration options"
811 This option will enable prompting for a variety of advanced kernel
812 configuration options. These options can cause the kernel to not
813 work if they are set incorrectly, but can be used to optimize certain
814 aspects of kernel memory management.
816 Unless you know what you are doing, say N here.
818 comment "Default settings for advanced configuration options are used"
819 depends on !ADVANCED_OPTIONS
821 config LOWMEM_SIZE_BOOL
822 bool "Set maximum low memory"
823 depends on ADVANCED_OPTIONS
825 This option allows you to set the maximum amount of memory which
826 will be used as "low memory", that is, memory which the kernel can
827 access directly, without having to set up a kernel virtual mapping.
828 This can be useful in optimizing the layout of kernel virtual
831 Say N here unless you know what you are doing.
834 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
837 config LOWMEM_CAM_NUM_BOOL
838 bool "Set number of CAMs to use to map low memory"
839 depends on ADVANCED_OPTIONS && FSL_BOOKE
841 This option allows you to set the maximum number of CAM slots that
842 will be used to map low memory. There are a limited number of slots
843 available and even more limited number that will fit in the L1 MMU.
844 However, using more entries will allow mapping more low memory. This
845 can be useful in optimizing the layout of kernel virtual memory.
847 Say N here unless you know what you are doing.
849 config LOWMEM_CAM_NUM
851 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
855 bool "Build a relocatable kernel (EXPERIMENTAL)"
856 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
858 This builds a kernel image that is capable of running at the
859 location the kernel is loaded at (some alignment restrictions may
862 One use is for the kexec on panic case where the recovery kernel
863 must live at a different physical address than the primary
866 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
867 it has been loaded at and the compile time physical addresses
868 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
869 setting can still be useful to bootwrappers that need to know the
870 load location of the kernel (eg. u-boot/mkimage).
872 config PAGE_OFFSET_BOOL
873 bool "Set custom page offset address"
874 depends on ADVANCED_OPTIONS
876 This option allows you to set the kernel virtual address at which
877 the kernel will map low memory. This can be useful in optimizing
878 the virtual memory layout of the system.
880 Say N here unless you know what you are doing.
883 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
886 config KERNEL_START_BOOL
887 bool "Set custom kernel base address"
888 depends on ADVANCED_OPTIONS
890 This option allows you to set the kernel virtual address at which
891 the kernel will be loaded. Normally this should match PAGE_OFFSET
892 however there are times (like kdump) that one might not want them
895 Say N here unless you know what you are doing.
898 hex "Virtual address of kernel base" if KERNEL_START_BOOL
899 default PAGE_OFFSET if PAGE_OFFSET_BOOL
900 default "0xc2000000" if CRASH_DUMP
903 config PHYSICAL_START_BOOL
904 bool "Set physical address where the kernel is loaded"
905 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
907 This gives the physical address where the kernel is loaded.
909 Say N here unless you know what you are doing.
911 config PHYSICAL_START
912 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
913 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
916 config PHYSICAL_ALIGN
918 default "0x04000000" if FSL_BOOKE
920 This value puts the alignment restrictions on physical address
921 where kernel is loaded and run from. Kernel is compiled for an
922 address which meets above alignment restriction.
924 config TASK_SIZE_BOOL
925 bool "Set custom user task size"
926 depends on ADVANCED_OPTIONS
928 This option allows you to set the amount of virtual address space
929 allocated to user tasks. This can be useful in optimizing the
930 virtual memory layout of the system.
932 Say N here unless you know what you are doing.
935 hex "Size of user task space" if TASK_SIZE_BOOL
936 default "0x80000000" if PPC_PREP || PPC_8xx
939 config CONSISTENT_SIZE_BOOL
940 bool "Set custom consistent memory pool size"
941 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
943 This option allows you to set the size of the
944 consistent memory pool. This pool of virtual memory
945 is used to make consistent memory allocations.
947 config CONSISTENT_SIZE
948 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
949 default "0x00200000" if NOT_COHERENT_CACHE
952 bool "Pinned Kernel TLBs (860 ONLY)"
953 depends on ADVANCED_OPTIONS && 8xx
958 bool "Build a relocatable kernel"
960 This builds a kernel image that is capable of running anywhere
961 in the RMA (real memory area) at any 16k-aligned base address.
962 The kernel is linked as a position-independent executable (PIE)
963 and contains dynamic relocations which are processed early
964 in the bootup process.
966 One use is for the kexec on panic case where the recovery kernel
967 must live at a different physical address than the primary
972 default "0xc000000000000000"
975 default "0xc000000000000000"
976 config PHYSICAL_START
983 source "drivers/Kconfig"
987 source "arch/powerpc/sysdev/qe_lib/Kconfig"
991 source "arch/powerpc/Kconfig.debug"
993 source "security/Kconfig"
997 depends on COMPAT && KEYS
1000 source "crypto/Kconfig"
1007 config PPC_LIB_RHEAP
1010 source "arch/powerpc/kvm/Kconfig"