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
125 select HAVE_FTRACE_MCOUNT_RECORD
126 select HAVE_DYNAMIC_FTRACE
127 select HAVE_FUNCTION_TRACER
128 select HAVE_FUNCTION_GRAPH_TRACER
129 select ARCH_WANT_OPTIONAL_GPIOLIB
131 select HAVE_IOREMAP_PROT
132 select HAVE_EFFICIENT_UNALIGNED_ACCESS
134 select HAVE_ARCH_KGDB
135 select HAVE_KRETPROBES
136 select HAVE_ARCH_TRACEHOOK
138 select HAVE_DMA_ATTRS
139 select HAVE_DMA_API_DEBUG
140 select USE_GENERIC_SMP_HELPERS if SMP
142 select HAVE_SYSCALL_WRAPPERS if PPC64
143 select GENERIC_ATOMIC64 if PPC32
144 select HAVE_PERF_EVENTS
145 select HAVE_REGS_AND_STACK_ACCESS_API
146 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
155 select COMPAT_BINFMT_ELF
157 config SYSVIPC_COMPAT
159 depends on COMPAT && SYSVIPC
162 # All PPC32s use generic nvram driver through ppc_md
167 config SCHED_OMIT_FRAME_POINTER
171 config ARCH_MAY_HAVE_PC_FDC
173 default !PPC_PSERIES || PCI
178 config PPC_UDBG_16550
182 config GENERIC_TBSYNC
184 default y if PPC32 && SMP
196 config SYS_SUPPORTS_APM_EMULATION
197 default y if PMAC_APM_EMU
200 config DEFAULT_UIMAGE
203 Used to allow a board to specify it wants a uImage built by default
209 config ARCH_HIBERNATION_POSSIBLE
213 config ARCH_SUSPEND_POSSIBLE
215 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
216 PPC_85xx || PPC_86xx || PPC_PSERIES
218 config PPC_DCR_NATIVE
228 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
231 config PPC_OF_PLATFORM_PCI
234 depends on PPC64 # not supported on 32 bits yet
237 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
240 config PPC_ADV_DEBUG_REGS
242 depends on 40x || BOOKE
245 config PPC_ADV_DEBUG_IACS
247 depends on PPC_ADV_DEBUG_REGS
251 config PPC_ADV_DEBUG_DACS
253 depends on PPC_ADV_DEBUG_REGS
256 config PPC_ADV_DEBUG_DVCS
258 depends on PPC_ADV_DEBUG_REGS
262 config PPC_ADV_DEBUG_DAC_RANGE
264 depends on PPC_ADV_DEBUG_REGS && 44x
267 source "init/Kconfig"
269 source "kernel/Kconfig.freezer"
271 source "arch/powerpc/sysdev/Kconfig"
272 source "arch/powerpc/platforms/Kconfig"
274 menu "Kernel options"
277 bool "High memory support"
280 source kernel/time/Kconfig
281 source kernel/Kconfig.hz
282 source kernel/Kconfig.preempt
283 source "fs/Kconfig.binfmt"
285 config HUGETLB_PAGE_SIZE_VARIABLE
287 depends on HUGETLB_PAGE
290 config MATH_EMULATION
291 bool "Math emulation"
292 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
294 Some PowerPC chips designed for embedded applications do not have
295 a floating-point unit and therefore do not implement the
296 floating-point instructions in the PowerPC instruction set. If you
297 say Y here, the kernel will include code to emulate a floating-point
298 unit, which will allow programs that use floating-point
301 config 8XX_MINIMAL_FPEMU
302 bool "Minimal math emulation for 8xx"
303 depends on 8xx && !MATH_EMULATION
305 Older arch/ppc kernels still emulated a few floating point
306 instructions such as load and store, even when full math
307 emulation is disabled. Say "Y" here if you want to preserve
310 It is recommended that you build a soft-float userspace instead.
316 bool "SWIOTLB support"
320 Support for IO bounce buffering for systems without an IOMMU.
321 This allows us to DMA to the full physical address space on
322 platforms where the size of a physical address is larger
323 than the bus address. Not all platforms support this.
326 bool "Support for enabling/disabling CPUs"
327 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
329 Say Y here to be able to disable and re-enable individual
330 CPUs at runtime on SMP machines.
332 Say N if you are unsure.
334 config ARCH_CPU_PROBE_RELEASE
336 depends on HOTPLUG_CPU
338 config ARCH_ENABLE_MEMORY_HOTPLUG
341 config ARCH_HAS_WALK_MEMORY
344 config ARCH_ENABLE_MEMORY_HOTREMOVE
348 bool "kexec system call (EXPERIMENTAL)"
349 depends on (PPC_BOOK3S || FSL_BOOKE) && EXPERIMENTAL
351 kexec is a system call that implements the ability to shutdown your
352 current kernel, and to start another kernel. It is like a reboot
353 but it is independent of the system firmware. And like a reboot
354 you can start any kernel with it, not just Linux.
356 The name comes from the similarity to the exec system call.
358 It is an ongoing process to be certain the hardware in a machine
359 is properly shutdown, so do not be surprised if this code does not
360 initially work for you. It may help to enable device hotplugging
361 support. As of this writing the exact hardware interface is
362 strongly in flux, so no good recommendation can be made.
365 bool "Build a kdump crash kernel"
366 depends on PPC64 || 6xx || FSL_BOOKE
367 select RELOCATABLE if PPC64 || FSL_BOOKE
369 Build a kernel suitable for use as a kdump capture kernel.
370 The same kernel binary can be used as production kernel and dump
374 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
375 depends on PPC_PSERIES && EXPERIMENTAL
377 Hypervisor-assisted dump is meant to be a kdump replacement
378 offering robustness and speed not possible without system
379 hypervisor assistance.
384 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
385 default y if PPC_PREP
388 bool "Distribute interrupts on all CPUs by default"
389 depends on SMP && !MV64360
391 This option gives the kernel permission to distribute IRQs across
392 multiple CPUs. Saying N here will route all IRQs to the first
393 CPU. Generally saying Y is safe, although some problems have been
394 reported with SMP Power Macintoshes with this option enabled.
397 bool "Support sparse irq numbering"
400 This enables support for sparse irqs. This is useful for distro
401 kernels that want to define a high CONFIG_NR_CPUS value but still
402 want to have low kernel memory footprint on smaller machines.
404 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
405 out the irq_desc[] array in a more NUMA-friendly way. )
407 If you don't know what to do here, say N.
412 default y if SMP && PPC_PSERIES
418 depends on NEED_MULTIPLE_NODES
420 config MAX_ACTIVE_REGIONS
422 default "256" if PPC64
425 config ARCH_SELECT_MEMORY_MODEL
429 config ARCH_FLATMEM_ENABLE
431 depends on (PPC64 && !NUMA) || PPC32
433 config ARCH_SPARSEMEM_ENABLE
436 select SPARSEMEM_VMEMMAP_ENABLE
438 config ARCH_SPARSEMEM_DEFAULT
440 depends on (SMP && PPC_PSERIES) || PPC_PS3
442 config ARCH_POPULATES_NODE_MAP
445 config SYS_SUPPORTS_HUGETLBFS
447 depends on PPC_BOOK3S_64
451 config ARCH_MEMORY_PROBE
453 depends on MEMORY_HOTPLUG
455 # Some NUMA nodes have memory ranges that span
456 # other nodes. Even though a pfn is valid and
457 # between a node's start and end pfns, it may not
458 # reside on that node. See memmap_init_zone()
460 config NODES_SPAN_OTHER_NODES
462 depends on NEED_MULTIPLE_NODES
464 config PPC_HAS_HASH_64K
470 bool "Using standard binutils settings"
474 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
475 Note, that kernel will be able to run only those applications,
476 which had been compiled using binutils later than 2.17.50.0.3 with
477 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
478 the older binutils, you can patch them with a trivial patch, which
479 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
485 Select the kernel logical page size. Increasing the page size
486 will reduce software overhead at each page boundary, allow
487 hardware prefetch mechanisms to be more effective, and allow
488 larger dma transfers increasing IO efficiency and reducing
489 overhead. However the utilization of memory will increase.
490 For example, each cached file will using a multiple of the
491 page size to hold its contents and the difference between the
492 end of file and the end of page is wasted.
494 Some dedicated systems, such as software raid serving with
495 accelerated calculations, have shown significant increases.
497 If you configure a 64 bit kernel for 64k pages but the
498 processor does not support them, then the kernel will simulate
499 them with 4k pages, loading them on demand, but with the
500 reduced software overhead and larger internal fragmentation.
501 For the 32 bit kernel, a large page option will not be offered
502 unless it is supported by the configured processor.
504 If unsure, choose 4K_PAGES.
510 bool "16k page size" if 44x
513 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
514 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
516 config PPC_256K_PAGES
517 bool "256k page size" if 44x
518 depends on !STDBINUTILS
520 Make the page size 256k.
522 As the ELF standard only requires alignment to support page
523 sizes up to 64k, you will need to compile all of your user
524 space applications with a non-standard binutils settings
525 (see the STDBINUTILS description for details).
527 Say N unless you know what you are doing.
531 config FORCE_MAX_ZONEORDER
532 int "Maximum zone order"
533 range 9 64 if PPC64 && PPC_64K_PAGES
534 default "9" if PPC64 && PPC_64K_PAGES
535 range 13 64 if PPC64 && !PPC_64K_PAGES
536 default "13" if PPC64 && !PPC_64K_PAGES
537 range 9 64 if PPC32 && PPC_16K_PAGES
538 default "9" if PPC32 && PPC_16K_PAGES
539 range 7 64 if PPC32 && PPC_64K_PAGES
540 default "7" if PPC32 && PPC_64K_PAGES
541 range 5 64 if PPC32 && PPC_256K_PAGES
542 default "5" if PPC32 && PPC_256K_PAGES
546 The kernel memory allocator divides physically contiguous memory
547 blocks into "zones", where each zone is a power of two number of
548 pages. This option selects the largest power of two that the kernel
549 keeps in the memory allocator. If you need to allocate very large
550 blocks of physically contiguous memory, then you may need to
553 This config option is actually maximum order plus one. For example,
554 a value of 11 means that the largest free memory block is 2^10 pages.
556 The page size is not necessarily 4KB. For example, on 64-bit
557 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
558 this in mind when choosing a value for this option.
560 config PPC_SUBPAGE_PROT
561 bool "Support setting protections for 4k subpages"
562 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
564 This option adds support for a system call to allow user programs
565 to set access permissions (read/write, readonly, or no access)
566 on the 4k subpages of each 64k page.
569 bool "SMT (Hyperthreading) scheduler support"
570 depends on PPC64 && SMP
572 SMT scheduler support improves the CPU scheduler's decision making
573 when dealing with POWER5 cpus at a cost of slightly increased
574 overhead in some places. If unsure say N here.
577 bool "Default bootloader kernel arguments"
580 string "Initial kernel command string"
581 depends on CMDLINE_BOOL
582 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
584 On some platforms, there is currently no way for the boot loader to
585 pass arguments to the kernel. For these platforms, you can supply
586 some command-line options at build time by entering them here. In
587 most cases you will need to specify the root device here.
590 string "Additional default image types"
592 List additional targets to be built by the bootwrapper here (separated
593 by spaces). This is useful for targets that depend of device tree
594 files in the .dts directory.
596 Targets in this list will be build as part of the default build
597 target, or when the user does a 'make zImage' or a
598 'make zImage.initrd'.
600 If unsure, leave blank
603 config ARCH_WANTS_FREEZER_CONTROL
607 source kernel/power/Kconfig
611 bool "Enable seccomp to safely compute untrusted bytecode"
615 This kernel feature is useful for number crunching applications
616 that may need to compute untrusted bytecode during their
617 execution. By using pipes or other transports made available to
618 the process as file descriptors supporting the read/write
619 syscalls, it's possible to isolate those applications in
620 their own address space using seccomp. Once seccomp is
621 enabled via /proc/<pid>/seccomp, it cannot be disabled
622 and the task is only allowed to execute a few safe syscalls
623 defined by each seccomp mode.
625 If unsure, say Y. Only embedded should say N here.
631 default !PPC_ISERIES || PCI
636 bool "Support for ISA-bus hardware"
637 depends on PPC_PREP || PPC_CHRP
640 Find out whether you have ISA slots on your motherboard. ISA is the
641 name of a bus system, i.e. the way the CPU talks to the other stuff
642 inside your box. If you have an Apple machine, say N here; if you
643 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
644 you have an embedded board, consult your board documentation.
650 config NEED_DMA_MAP_STATE
651 def_bool (PPC64 || NOT_COHERENT_CACHE)
653 config NEED_SG_DMA_LENGTH
656 config GENERIC_ISA_DMA
658 depends on ISA_DMA_API
661 config PPC_INDIRECT_PCI
664 default y if 40x || 44x
678 select PPC_INDIRECT_PCI
684 depends on SUSPEND && (PPC_85xx || PPC_86xx)
686 Freescale MPC85xx/MPC86xx power management controller support
687 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
695 Freescale Localbus support
699 depends on PPC_83xx || QUICC_ENGINE || CPM2
701 Freescale General-purpose Timers support
703 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
707 # Platforms that what PCI turned unconditionally just do select PCI
708 # in their config node. Platforms that want to choose at config
709 # time should select PPC_PCI_CHOICE
710 config PPC_PCI_CHOICE
714 bool "PCI support" if PPC_PCI_CHOICE
715 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
716 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
717 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
718 default PCI_QSPAN if !4xx && !CPM2 && 8xx
719 select ARCH_SUPPORTS_MSI
721 Find out whether your system includes a PCI bus. PCI is the name of
722 a bus system, i.e. the way the CPU talks to the other stuff inside
723 your box. If you say Y here, the kernel will include drivers and
724 infrastructure code to support PCI bus devices.
734 depends on !4xx && !CPM2 && 8xx
737 Say Y here if you have a system based on a Motorola 8xx-series
738 embedded processor with a QSPAN PCI interface, otherwise say N.
742 depends on PCI && 8260
743 select PPC_INDIRECT_PCI
747 bool "Enable workaround for MPC826x erratum PCI 9"
748 depends on PCI_8260 && !8272
752 prompt "IDMA channel for PCI 9 workaround"
755 config 8260_PCI9_IDMA1
758 config 8260_PCI9_IDMA2
761 config 8260_PCI9_IDMA3
764 config 8260_PCI9_IDMA4
769 source "drivers/pci/pcie/Kconfig"
771 source "drivers/pci/Kconfig"
773 source "drivers/pcmcia/Kconfig"
775 source "drivers/pci/hotplug/Kconfig"
782 bool "RapidIO support"
783 depends on HAS_RAPIDIO
785 If you say Y here, the kernel will include drivers and
786 infrastructure code to support RapidIO interconnect devices.
788 source "drivers/rapidio/Kconfig"
792 menu "Advanced setup"
795 config ADVANCED_OPTIONS
796 bool "Prompt for advanced kernel configuration options"
798 This option will enable prompting for a variety of advanced kernel
799 configuration options. These options can cause the kernel to not
800 work if they are set incorrectly, but can be used to optimize certain
801 aspects of kernel memory management.
803 Unless you know what you are doing, say N here.
805 comment "Default settings for advanced configuration options are used"
806 depends on !ADVANCED_OPTIONS
808 config LOWMEM_SIZE_BOOL
809 bool "Set maximum low memory"
810 depends on ADVANCED_OPTIONS
812 This option allows you to set the maximum amount of memory which
813 will be used as "low memory", that is, memory which the kernel can
814 access directly, without having to set up a kernel virtual mapping.
815 This can be useful in optimizing the layout of kernel virtual
818 Say N here unless you know what you are doing.
821 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
824 config LOWMEM_CAM_NUM_BOOL
825 bool "Set number of CAMs to use to map low memory"
826 depends on ADVANCED_OPTIONS && FSL_BOOKE
828 This option allows you to set the maximum number of CAM slots that
829 will be used to map low memory. There are a limited number of slots
830 available and even more limited number that will fit in the L1 MMU.
831 However, using more entries will allow mapping more low memory. This
832 can be useful in optimizing the layout of kernel virtual memory.
834 Say N here unless you know what you are doing.
836 config LOWMEM_CAM_NUM
838 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
842 bool "Build a relocatable kernel (EXPERIMENTAL)"
843 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
845 This builds a kernel image that is capable of running at the
846 location the kernel is loaded at (some alignment restrictions may
849 One use is for the kexec on panic case where the recovery kernel
850 must live at a different physical address than the primary
853 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
854 it has been loaded at and the compile time physical addresses
855 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
856 setting can still be useful to bootwrappers that need to know the
857 load location of the kernel (eg. u-boot/mkimage).
859 config PAGE_OFFSET_BOOL
860 bool "Set custom page offset address"
861 depends on ADVANCED_OPTIONS
863 This option allows you to set the kernel virtual address at which
864 the kernel will map low memory. This can be useful in optimizing
865 the virtual memory layout of the system.
867 Say N here unless you know what you are doing.
870 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
873 config KERNEL_START_BOOL
874 bool "Set custom kernel base address"
875 depends on ADVANCED_OPTIONS
877 This option allows you to set the kernel virtual address at which
878 the kernel will be loaded. Normally this should match PAGE_OFFSET
879 however there are times (like kdump) that one might not want them
882 Say N here unless you know what you are doing.
885 hex "Virtual address of kernel base" if KERNEL_START_BOOL
886 default PAGE_OFFSET if PAGE_OFFSET_BOOL
887 default "0xc2000000" if CRASH_DUMP && !RELOCATABLE
890 config PHYSICAL_START_BOOL
891 bool "Set physical address where the kernel is loaded"
892 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
894 This gives the physical address where the kernel is loaded.
896 Say N here unless you know what you are doing.
898 config PHYSICAL_START
899 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
900 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !RELOCATABLE
903 config PHYSICAL_ALIGN
905 default "0x04000000" if FSL_BOOKE
907 This value puts the alignment restrictions on physical address
908 where kernel is loaded and run from. Kernel is compiled for an
909 address which meets above alignment restriction.
911 config TASK_SIZE_BOOL
912 bool "Set custom user task size"
913 depends on ADVANCED_OPTIONS
915 This option allows you to set the amount of virtual address space
916 allocated to user tasks. This can be useful in optimizing the
917 virtual memory layout of the system.
919 Say N here unless you know what you are doing.
922 hex "Size of user task space" if TASK_SIZE_BOOL
923 default "0x80000000" if PPC_PREP || PPC_8xx
926 config CONSISTENT_SIZE_BOOL
927 bool "Set custom consistent memory pool size"
928 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
930 This option allows you to set the size of the
931 consistent memory pool. This pool of virtual memory
932 is used to make consistent memory allocations.
934 config CONSISTENT_SIZE
935 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
936 default "0x00200000" if NOT_COHERENT_CACHE
939 bool "Pinned Kernel TLBs (860 ONLY)"
940 depends on ADVANCED_OPTIONS && 8xx
945 bool "Build a relocatable kernel"
947 This builds a kernel image that is capable of running anywhere
948 in the RMA (real memory area) at any 16k-aligned base address.
949 The kernel is linked as a position-independent executable (PIE)
950 and contains dynamic relocations which are processed early
951 in the bootup process.
953 One use is for the kexec on panic case where the recovery kernel
954 must live at a different physical address than the primary
959 default "0xc000000000000000"
962 default "0xc000000000000000"
963 config PHYSICAL_START
970 source "drivers/Kconfig"
974 source "arch/powerpc/sysdev/qe_lib/Kconfig"
978 source "arch/powerpc/Kconfig.debug"
980 source "security/Kconfig"
984 depends on COMPAT && KEYS
987 source "crypto/Kconfig"
997 source "arch/powerpc/kvm/Kconfig"