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
151 select COMPAT_BINFMT_ELF
153 config SYSVIPC_COMPAT
155 depends on COMPAT && SYSVIPC
158 # All PPC32s use generic nvram driver through ppc_md
163 config SCHED_OMIT_FRAME_POINTER
167 config ARCH_MAY_HAVE_PC_FDC
169 default !PPC_PSERIES || PCI
177 config PPC_UDBG_16550
181 config GENERIC_TBSYNC
183 default y if PPC32 && SMP
195 config SYS_SUPPORTS_APM_EMULATION
196 default y if PMAC_APM_EMU
203 config DEFAULT_UIMAGE
206 Used to allow a board to specify it wants a uImage built by default
212 config ARCH_HIBERNATION_POSSIBLE
216 config ARCH_SUSPEND_POSSIBLE
218 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.
315 bool "Support for enabling/disabling CPUs"
316 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
318 Say Y here to be able to disable and re-enable individual
319 CPUs at runtime on SMP machines.
321 Say N if you are unsure.
323 config ARCH_ENABLE_MEMORY_HOTPLUG
326 config ARCH_HAS_WALK_MEMORY
329 config ARCH_ENABLE_MEMORY_HOTREMOVE
333 bool "kexec system call (EXPERIMENTAL)"
334 depends on PPC_BOOK3S && EXPERIMENTAL
336 kexec is a system call that implements the ability to shutdown your
337 current kernel, and to start another kernel. It is like a reboot
338 but it is independent of the system firmware. And like a reboot
339 you can start any kernel with it, not just Linux.
341 The name comes from the similarity to the exec system call.
343 It is an ongoing process to be certain the hardware in a machine
344 is properly shutdown, so do not be surprised if this code does not
345 initially work for you. It may help to enable device hotplugging
346 support. As of this writing the exact hardware interface is
347 strongly in flux, so no good recommendation can be made.
350 bool "Build a kdump crash kernel"
351 depends on PPC64 || 6xx
352 select RELOCATABLE if PPC64
354 Build a kernel suitable for use as a kdump capture kernel.
355 The same kernel binary can be used as production kernel and dump
359 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
360 depends on PPC_PSERIES && EXPERIMENTAL
362 Hypervisor-assisted dump is meant to be a kdump replacement
363 offering robustness and speed not possible without system
364 hypervisor assistance.
369 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
370 default y if PPC_PREP
373 bool "Distribute interrupts on all CPUs by default"
374 depends on SMP && !MV64360
376 This option gives the kernel permission to distribute IRQs across
377 multiple CPUs. Saying N here will route all IRQs to the first
378 CPU. Generally saying Y is safe, although some problems have been
379 reported with SMP Power Macintoshes with this option enabled.
382 bool "Support sparse irq numbering"
385 This enables support for sparse irqs. This is useful for distro
386 kernels that want to define a high CONFIG_NR_CPUS value but still
387 want to have low kernel memory footprint on smaller machines.
389 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
390 out the irq_desc[] array in a more NUMA-friendly way. )
392 If you don't know what to do here, say Y.
397 default y if SMP && PPC_PSERIES
403 depends on NEED_MULTIPLE_NODES
405 config MAX_ACTIVE_REGIONS
407 default "256" if PPC64
410 config ARCH_SELECT_MEMORY_MODEL
414 config ARCH_FLATMEM_ENABLE
416 depends on (PPC64 && !NUMA) || PPC32
418 config ARCH_SPARSEMEM_ENABLE
421 select SPARSEMEM_VMEMMAP_ENABLE
423 config ARCH_SPARSEMEM_DEFAULT
425 depends on (SMP && PPC_PSERIES) || PPC_PS3
427 config ARCH_POPULATES_NODE_MAP
430 config SYS_SUPPORTS_HUGETLBFS
432 depends on PPC_BOOK3S_64
436 config ARCH_MEMORY_PROBE
438 depends on MEMORY_HOTPLUG
440 # Some NUMA nodes have memory ranges that span
441 # other nodes. Even though a pfn is valid and
442 # between a node's start and end pfns, it may not
443 # reside on that node. See memmap_init_zone()
445 config NODES_SPAN_OTHER_NODES
447 depends on NEED_MULTIPLE_NODES
449 config PPC_HAS_HASH_64K
455 bool "Using standard binutils settings"
459 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
460 Note, that kernel will be able to run only those applications,
461 which had been compiled using binutils later than 2.17.50.0.3 with
462 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
463 the older binutils, you can patch them with a trivial patch, which
464 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
470 Select the kernel logical page size. Increasing the page size
471 will reduce software overhead at each page boundary, allow
472 hardware prefetch mechanisms to be more effective, and allow
473 larger dma transfers increasing IO efficiency and reducing
474 overhead. However the utilization of memory will increase.
475 For example, each cached file will using a multiple of the
476 page size to hold its contents and the difference between the
477 end of file and the end of page is wasted.
479 Some dedicated systems, such as software raid serving with
480 accelerated calculations, have shown significant increases.
482 If you configure a 64 bit kernel for 64k pages but the
483 processor does not support them, then the kernel will simulate
484 them with 4k pages, loading them on demand, but with the
485 reduced software overhead and larger internal fragmentation.
486 For the 32 bit kernel, a large page option will not be offered
487 unless it is supported by the configured processor.
489 If unsure, choose 4K_PAGES.
495 bool "16k page size" if 44x
498 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
499 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
501 config PPC_256K_PAGES
502 bool "256k page size" if 44x
503 depends on !STDBINUTILS
505 Make the page size 256k.
507 As the ELF standard only requires alignment to support page
508 sizes up to 64k, you will need to compile all of your user
509 space applications with a non-standard binutils settings
510 (see the STDBINUTILS description for details).
512 Say N unless you know what you are doing.
516 config FORCE_MAX_ZONEORDER
517 int "Maximum zone order"
518 range 9 64 if PPC64 && PPC_64K_PAGES
519 default "9" if PPC64 && PPC_64K_PAGES
520 range 13 64 if PPC64 && !PPC_64K_PAGES
521 default "13" if PPC64 && !PPC_64K_PAGES
522 range 9 64 if PPC32 && PPC_16K_PAGES
523 default "9" if PPC32 && PPC_16K_PAGES
524 range 7 64 if PPC32 && PPC_64K_PAGES
525 default "7" if PPC32 && PPC_64K_PAGES
526 range 5 64 if PPC32 && PPC_256K_PAGES
527 default "5" if PPC32 && PPC_256K_PAGES
531 The kernel memory allocator divides physically contiguous memory
532 blocks into "zones", where each zone is a power of two number of
533 pages. This option selects the largest power of two that the kernel
534 keeps in the memory allocator. If you need to allocate very large
535 blocks of physically contiguous memory, then you may need to
538 This config option is actually maximum order plus one. For example,
539 a value of 11 means that the largest free memory block is 2^10 pages.
541 The page size is not necessarily 4KB. For example, on 64-bit
542 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
543 this in mind when choosing a value for this option.
545 config PPC_SUBPAGE_PROT
546 bool "Support setting protections for 4k subpages"
547 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
549 This option adds support for a system call to allow user programs
550 to set access permissions (read/write, readonly, or no access)
551 on the 4k subpages of each 64k page.
554 bool "SMT (Hyperthreading) scheduler support"
555 depends on PPC64 && SMP
557 SMT scheduler support improves the CPU scheduler's decision making
558 when dealing with POWER5 cpus at a cost of slightly increased
559 overhead in some places. If unsure say N here.
561 config PROC_DEVICETREE
562 bool "Support for device tree in /proc"
565 This option adds a device-tree directory under /proc which contains
566 an image of the device tree that the kernel copies from Open
567 Firmware or other boot firmware. If unsure, say Y here.
570 bool "Default bootloader kernel arguments"
573 string "Initial kernel command string"
574 depends on CMDLINE_BOOL
575 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
577 On some platforms, there is currently no way for the boot loader to
578 pass arguments to the kernel. For these platforms, you can supply
579 some command-line options at build time by entering them here. In
580 most cases you will need to specify the root device here.
583 string "Additional default image types"
585 List additional targets to be built by the bootwrapper here (separated
586 by spaces). This is useful for targets that depend of device tree
587 files in the .dts directory.
589 Targets in this list will be build as part of the default build
590 target, or when the user does a 'make zImage' or a
591 'make zImage.initrd'.
593 If unsure, leave blank
596 config ARCH_WANTS_FREEZER_CONTROL
600 source kernel/power/Kconfig
604 bool "Enable seccomp to safely compute untrusted bytecode"
608 This kernel feature is useful for number crunching applications
609 that may need to compute untrusted bytecode during their
610 execution. By using pipes or other transports made available to
611 the process as file descriptors supporting the read/write
612 syscalls, it's possible to isolate those applications in
613 their own address space using seccomp. Once seccomp is
614 enabled via /proc/<pid>/seccomp, it cannot be disabled
615 and the task is only allowed to execute a few safe syscalls
616 defined by each seccomp mode.
618 If unsure, say Y. Only embedded should say N here.
624 default !PPC_ISERIES || PCI
629 bool "Support for ISA-bus hardware"
630 depends on PPC_PREP || PPC_CHRP
633 Find out whether you have ISA slots on your motherboard. ISA is the
634 name of a bus system, i.e. the way the CPU talks to the other stuff
635 inside your box. If you have an Apple machine, say N here; if you
636 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
637 you have an embedded board, consult your board documentation.
643 config GENERIC_ISA_DMA
645 depends on PPC64 || POWER4 || 6xx && !CPM2
648 config PPC_INDIRECT_PCI
651 default y if 40x || 44x
665 select PPC_INDIRECT_PCI
671 depends on SUSPEND && (PPC_85xx || PPC_86xx)
673 Freescale MPC85xx/MPC86xx power management controller support
674 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
682 Freescale Localbus support
686 depends on PPC_83xx || QUICC_ENGINE || CPM2
688 Freescale General-purpose Timers support
690 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
694 # Platforms that what PCI turned unconditionally just do select PCI
695 # in their config node. Platforms that want to choose at config
696 # time should select PPC_PCI_CHOICE
697 config PPC_PCI_CHOICE
701 bool "PCI support" if PPC_PCI_CHOICE
702 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
703 && !PPC_85xx && !PPC_86xx
704 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
705 default PCI_QSPAN if !4xx && !CPM2 && 8xx
706 select ARCH_SUPPORTS_MSI
708 Find out whether your system includes a PCI bus. PCI is the name of
709 a bus system, i.e. the way the CPU talks to the other stuff inside
710 your box. If you say Y here, the kernel will include drivers and
711 infrastructure code to support PCI bus devices.
721 depends on !4xx && !CPM2 && 8xx
724 Say Y here if you have a system based on a Motorola 8xx-series
725 embedded processor with a QSPAN PCI interface, otherwise say N.
729 depends on PCI && 8260
730 select PPC_INDIRECT_PCI
734 bool "Enable workaround for MPC826x erratum PCI 9"
735 depends on PCI_8260 && !8272
739 prompt "IDMA channel for PCI 9 workaround"
742 config 8260_PCI9_IDMA1
745 config 8260_PCI9_IDMA2
748 config 8260_PCI9_IDMA3
751 config 8260_PCI9_IDMA4
756 source "drivers/pci/pcie/Kconfig"
758 source "drivers/pci/Kconfig"
760 source "drivers/pcmcia/Kconfig"
762 source "drivers/pci/hotplug/Kconfig"
769 bool "RapidIO support"
770 depends on HAS_RAPIDIO
772 If you say Y here, the kernel will include drivers and
773 infrastructure code to support RapidIO interconnect devices.
775 source "drivers/rapidio/Kconfig"
779 menu "Advanced setup"
782 config ADVANCED_OPTIONS
783 bool "Prompt for advanced kernel configuration options"
785 This option will enable prompting for a variety of advanced kernel
786 configuration options. These options can cause the kernel to not
787 work if they are set incorrectly, but can be used to optimize certain
788 aspects of kernel memory management.
790 Unless you know what you are doing, say N here.
792 comment "Default settings for advanced configuration options are used"
793 depends on !ADVANCED_OPTIONS
795 config LOWMEM_SIZE_BOOL
796 bool "Set maximum low memory"
797 depends on ADVANCED_OPTIONS
799 This option allows you to set the maximum amount of memory which
800 will be used as "low memory", that is, memory which the kernel can
801 access directly, without having to set up a kernel virtual mapping.
802 This can be useful in optimizing the layout of kernel virtual
805 Say N here unless you know what you are doing.
808 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
811 config LOWMEM_CAM_NUM_BOOL
812 bool "Set number of CAMs to use to map low memory"
813 depends on ADVANCED_OPTIONS && FSL_BOOKE
815 This option allows you to set the maximum number of CAM slots that
816 will be used to map low memory. There are a limited number of slots
817 available and even more limited number that will fit in the L1 MMU.
818 However, using more entries will allow mapping more low memory. This
819 can be useful in optimizing the layout of kernel virtual memory.
821 Say N here unless you know what you are doing.
823 config LOWMEM_CAM_NUM
825 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
829 bool "Build a relocatable kernel (EXPERIMENTAL)"
830 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
832 This builds a kernel image that is capable of running at the
833 location the kernel is loaded at (some alignment restrictions may
836 One use is for the kexec on panic case where the recovery kernel
837 must live at a different physical address than the primary
840 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
841 it has been loaded at and the compile time physical addresses
842 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
843 setting can still be useful to bootwrappers that need to know the
844 load location of the kernel (eg. u-boot/mkimage).
846 config PAGE_OFFSET_BOOL
847 bool "Set custom page offset address"
848 depends on ADVANCED_OPTIONS
850 This option allows you to set the kernel virtual address at which
851 the kernel will map low memory. This can be useful in optimizing
852 the virtual memory layout of the system.
854 Say N here unless you know what you are doing.
857 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
860 config KERNEL_START_BOOL
861 bool "Set custom kernel base address"
862 depends on ADVANCED_OPTIONS
864 This option allows you to set the kernel virtual address at which
865 the kernel will be loaded. Normally this should match PAGE_OFFSET
866 however there are times (like kdump) that one might not want them
869 Say N here unless you know what you are doing.
872 hex "Virtual address of kernel base" if KERNEL_START_BOOL
873 default PAGE_OFFSET if PAGE_OFFSET_BOOL
874 default "0xc2000000" if CRASH_DUMP
877 config PHYSICAL_START_BOOL
878 bool "Set physical address where the kernel is loaded"
879 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
881 This gives the physical address where the kernel is loaded.
883 Say N here unless you know what you are doing.
885 config PHYSICAL_START
886 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
887 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
890 config PHYSICAL_ALIGN
892 default "0x04000000" if FSL_BOOKE
894 This value puts the alignment restrictions on physical address
895 where kernel is loaded and run from. Kernel is compiled for an
896 address which meets above alignment restriction.
898 config TASK_SIZE_BOOL
899 bool "Set custom user task size"
900 depends on ADVANCED_OPTIONS
902 This option allows you to set the amount of virtual address space
903 allocated to user tasks. This can be useful in optimizing the
904 virtual memory layout of the system.
906 Say N here unless you know what you are doing.
909 hex "Size of user task space" if TASK_SIZE_BOOL
910 default "0x80000000" if PPC_PREP || PPC_8xx
913 config CONSISTENT_SIZE_BOOL
914 bool "Set custom consistent memory pool size"
915 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
917 This option allows you to set the size of the
918 consistent memory pool. This pool of virtual memory
919 is used to make consistent memory allocations.
921 config CONSISTENT_SIZE
922 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
923 default "0x00200000" if NOT_COHERENT_CACHE
926 bool "Pinned Kernel TLBs (860 ONLY)"
927 depends on ADVANCED_OPTIONS && 8xx
932 bool "Build a relocatable kernel"
934 This builds a kernel image that is capable of running anywhere
935 in the RMA (real memory area) at any 16k-aligned base address.
936 The kernel is linked as a position-independent executable (PIE)
937 and contains dynamic relocations which are processed early
938 in the bootup process.
940 One use is for the kexec on panic case where the recovery kernel
941 must live at a different physical address than the primary
946 default "0xc000000000000000"
949 default "0xc000000000000000"
950 config PHYSICAL_START
957 source "drivers/Kconfig"
961 source "arch/powerpc/sysdev/qe_lib/Kconfig"
965 source "arch/powerpc/Kconfig.debug"
967 source "security/Kconfig"
971 depends on COMPAT && KEYS
974 source "crypto/Kconfig"
984 source "arch/powerpc/kvm/Kconfig"