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
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.
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.
384 default y if SMP && PPC_PSERIES
390 depends on NEED_MULTIPLE_NODES
392 config MAX_ACTIVE_REGIONS
394 default "256" if PPC64
397 config ARCH_SELECT_MEMORY_MODEL
401 config ARCH_FLATMEM_ENABLE
403 depends on (PPC64 && !NUMA) || PPC32
405 config ARCH_SPARSEMEM_ENABLE
408 select SPARSEMEM_VMEMMAP_ENABLE
410 config ARCH_SPARSEMEM_DEFAULT
412 depends on (SMP && PPC_PSERIES) || PPC_PS3
414 config ARCH_POPULATES_NODE_MAP
419 config ARCH_MEMORY_PROBE
421 depends on MEMORY_HOTPLUG
423 # Some NUMA nodes have memory ranges that span
424 # other nodes. Even though a pfn is valid and
425 # between a node's start and end pfns, it may not
426 # reside on that node. See memmap_init_zone()
428 config NODES_SPAN_OTHER_NODES
430 depends on NEED_MULTIPLE_NODES
432 config PPC_HAS_HASH_64K
438 bool "Using standard binutils settings"
442 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
443 Note, that kernel will be able to run only those applications,
444 which had been compiled using binutils later than 2.17.50.0.3 with
445 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
446 the older binutils, you can patch them with a trivial patch, which
447 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
453 Select the kernel logical page size. Increasing the page size
454 will reduce software overhead at each page boundary, allow
455 hardware prefetch mechanisms to be more effective, and allow
456 larger dma transfers increasing IO efficiency and reducing
457 overhead. However the utilization of memory will increase.
458 For example, each cached file will using a multiple of the
459 page size to hold its contents and the difference between the
460 end of file and the end of page is wasted.
462 Some dedicated systems, such as software raid serving with
463 accelerated calculations, have shown significant increases.
465 If you configure a 64 bit kernel for 64k pages but the
466 processor does not support them, then the kernel will simulate
467 them with 4k pages, loading them on demand, but with the
468 reduced software overhead and larger internal fragmentation.
469 For the 32 bit kernel, a large page option will not be offered
470 unless it is supported by the configured processor.
472 If unsure, choose 4K_PAGES.
478 bool "16k page size" if 44x
481 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
482 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
484 config PPC_256K_PAGES
485 bool "256k page size" if 44x
486 depends on !STDBINUTILS
488 Make the page size 256k.
490 As the ELF standard only requires alignment to support page
491 sizes up to 64k, you will need to compile all of your user
492 space applications with a non-standard binutils settings
493 (see the STDBINUTILS description for details).
495 Say N unless you know what you are doing.
499 config FORCE_MAX_ZONEORDER
500 int "Maximum zone order"
501 range 9 64 if PPC64 && PPC_64K_PAGES
502 default "9" if PPC64 && PPC_64K_PAGES
503 range 13 64 if PPC64 && !PPC_64K_PAGES
504 default "13" if PPC64 && !PPC_64K_PAGES
505 range 9 64 if PPC32 && PPC_16K_PAGES
506 default "9" if PPC32 && PPC_16K_PAGES
507 range 7 64 if PPC32 && PPC_64K_PAGES
508 default "7" if PPC32 && PPC_64K_PAGES
509 range 5 64 if PPC32 && PPC_256K_PAGES
510 default "5" if PPC32 && PPC_256K_PAGES
514 The kernel memory allocator divides physically contiguous memory
515 blocks into "zones", where each zone is a power of two number of
516 pages. This option selects the largest power of two that the kernel
517 keeps in the memory allocator. If you need to allocate very large
518 blocks of physically contiguous memory, then you may need to
521 This config option is actually maximum order plus one. For example,
522 a value of 11 means that the largest free memory block is 2^10 pages.
524 The page size is not necessarily 4KB. For example, on 64-bit
525 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
526 this in mind when choosing a value for this option.
528 config PPC_SUBPAGE_PROT
529 bool "Support setting protections for 4k subpages"
530 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
532 This option adds support for a system call to allow user programs
533 to set access permissions (read/write, readonly, or no access)
534 on the 4k subpages of each 64k page.
537 bool "SMT (Hyperthreading) scheduler support"
538 depends on PPC64 && SMP
540 SMT scheduler support improves the CPU scheduler's decision making
541 when dealing with POWER5 cpus at a cost of slightly increased
542 overhead in some places. If unsure say N here.
544 config PROC_DEVICETREE
545 bool "Support for device tree in /proc"
548 This option adds a device-tree directory under /proc which contains
549 an image of the device tree that the kernel copies from Open
550 Firmware or other boot firmware. If unsure, say Y here.
553 bool "Default bootloader kernel arguments"
556 string "Initial kernel command string"
557 depends on CMDLINE_BOOL
558 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
560 On some platforms, there is currently no way for the boot loader to
561 pass arguments to the kernel. For these platforms, you can supply
562 some command-line options at build time by entering them here. In
563 most cases you will need to specify the root device here.
566 string "Additional default image types"
568 List additional targets to be built by the bootwrapper here (separated
569 by spaces). This is useful for targets that depend of device tree
570 files in the .dts directory.
572 Targets in this list will be build as part of the default build
573 target, or when the user does a 'make zImage' or a
574 'make zImage.initrd'.
576 If unsure, leave blank
579 config ARCH_WANTS_FREEZER_CONTROL
583 source kernel/power/Kconfig
587 bool "Enable seccomp to safely compute untrusted bytecode"
591 This kernel feature is useful for number crunching applications
592 that may need to compute untrusted bytecode during their
593 execution. By using pipes or other transports made available to
594 the process as file descriptors supporting the read/write
595 syscalls, it's possible to isolate those applications in
596 their own address space using seccomp. Once seccomp is
597 enabled via /proc/<pid>/seccomp, it cannot be disabled
598 and the task is only allowed to execute a few safe syscalls
599 defined by each seccomp mode.
601 If unsure, say Y. Only embedded should say N here.
607 default !PPC_ISERIES || PCI
612 bool "Support for ISA-bus hardware"
613 depends on PPC_PREP || PPC_CHRP
616 Find out whether you have ISA slots on your motherboard. ISA is the
617 name of a bus system, i.e. the way the CPU talks to the other stuff
618 inside your box. If you have an Apple machine, say N here; if you
619 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
620 you have an embedded board, consult your board documentation.
626 config GENERIC_ISA_DMA
628 depends on PPC64 || POWER4 || 6xx && !CPM2
631 config PPC_INDIRECT_PCI
634 default y if 40x || 44x
648 select PPC_INDIRECT_PCI
657 Freescale Localbus support
661 depends on PPC_83xx || QUICC_ENGINE || CPM2
663 Freescale General-purpose Timers support
665 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
669 # Platforms that what PCI turned unconditionally just do select PCI
670 # in their config node. Platforms that want to choose at config
671 # time should select PPC_PCI_CHOICE
672 config PPC_PCI_CHOICE
676 bool "PCI support" if PPC_PCI_CHOICE
677 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
678 && !PPC_85xx && !PPC_86xx
679 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
680 default PCI_QSPAN if !4xx && !CPM2 && 8xx
681 select ARCH_SUPPORTS_MSI
683 Find out whether your system includes a PCI bus. PCI is the name of
684 a bus system, i.e. the way the CPU talks to the other stuff inside
685 your box. If you say Y here, the kernel will include drivers and
686 infrastructure code to support PCI bus devices.
696 depends on !4xx && !CPM2 && 8xx
699 Say Y here if you have a system based on a Motorola 8xx-series
700 embedded processor with a QSPAN PCI interface, otherwise say N.
704 depends on PCI && 8260
705 select PPC_INDIRECT_PCI
709 bool "Enable workaround for MPC826x erratum PCI 9"
710 depends on PCI_8260 && !8272
714 prompt "IDMA channel for PCI 9 workaround"
717 config 8260_PCI9_IDMA1
720 config 8260_PCI9_IDMA2
723 config 8260_PCI9_IDMA3
726 config 8260_PCI9_IDMA4
731 source "drivers/pci/pcie/Kconfig"
733 source "drivers/pci/Kconfig"
735 source "drivers/pcmcia/Kconfig"
737 source "drivers/pci/hotplug/Kconfig"
744 bool "RapidIO support"
745 depends on HAS_RAPIDIO
747 If you say Y here, the kernel will include drivers and
748 infrastructure code to support RapidIO interconnect devices.
750 source "drivers/rapidio/Kconfig"
754 menu "Advanced setup"
757 config ADVANCED_OPTIONS
758 bool "Prompt for advanced kernel configuration options"
760 This option will enable prompting for a variety of advanced kernel
761 configuration options. These options can cause the kernel to not
762 work if they are set incorrectly, but can be used to optimize certain
763 aspects of kernel memory management.
765 Unless you know what you are doing, say N here.
767 comment "Default settings for advanced configuration options are used"
768 depends on !ADVANCED_OPTIONS
770 config LOWMEM_SIZE_BOOL
771 bool "Set maximum low memory"
772 depends on ADVANCED_OPTIONS
774 This option allows you to set the maximum amount of memory which
775 will be used as "low memory", that is, memory which the kernel can
776 access directly, without having to set up a kernel virtual mapping.
777 This can be useful in optimizing the layout of kernel virtual
780 Say N here unless you know what you are doing.
783 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
786 config LOWMEM_CAM_NUM_BOOL
787 bool "Set number of CAMs to use to map low memory"
788 depends on ADVANCED_OPTIONS && FSL_BOOKE
790 This option allows you to set the maximum number of CAM slots that
791 will be used to map low memory. There are a limited number of slots
792 available and even more limited number that will fit in the L1 MMU.
793 However, using more entries will allow mapping more low memory. This
794 can be useful in optimizing the layout of kernel virtual memory.
796 Say N here unless you know what you are doing.
798 config LOWMEM_CAM_NUM
800 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
804 bool "Build a relocatable kernel (EXPERIMENTAL)"
805 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
807 This builds a kernel image that is capable of running at the
808 location the kernel is loaded at (some alignment restrictions may
811 One use is for the kexec on panic case where the recovery kernel
812 must live at a different physical address than the primary
815 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
816 it has been loaded at and the compile time physical addresses
817 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
818 setting can still be useful to bootwrappers that need to know the
819 load location of the kernel (eg. u-boot/mkimage).
821 config PAGE_OFFSET_BOOL
822 bool "Set custom page offset address"
823 depends on ADVANCED_OPTIONS
825 This option allows you to set the kernel virtual address at which
826 the kernel will map low memory. This can be useful in optimizing
827 the virtual memory layout of the system.
829 Say N here unless you know what you are doing.
832 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
835 config KERNEL_START_BOOL
836 bool "Set custom kernel base address"
837 depends on ADVANCED_OPTIONS
839 This option allows you to set the kernel virtual address at which
840 the kernel will be loaded. Normally this should match PAGE_OFFSET
841 however there are times (like kdump) that one might not want them
844 Say N here unless you know what you are doing.
847 hex "Virtual address of kernel base" if KERNEL_START_BOOL
848 default PAGE_OFFSET if PAGE_OFFSET_BOOL
849 default "0xc2000000" if CRASH_DUMP
852 config PHYSICAL_START_BOOL
853 bool "Set physical address where the kernel is loaded"
854 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
856 This gives the physical address where the kernel is loaded.
858 Say N here unless you know what you are doing.
860 config PHYSICAL_START
861 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
862 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
865 config PHYSICAL_ALIGN
867 default "0x04000000" if FSL_BOOKE
869 This value puts the alignment restrictions on physical address
870 where kernel is loaded and run from. Kernel is compiled for an
871 address which meets above alignment restriction.
873 config TASK_SIZE_BOOL
874 bool "Set custom user task size"
875 depends on ADVANCED_OPTIONS
877 This option allows you to set the amount of virtual address space
878 allocated to user tasks. This can be useful in optimizing the
879 virtual memory layout of the system.
881 Say N here unless you know what you are doing.
884 hex "Size of user task space" if TASK_SIZE_BOOL
885 default "0x80000000" if PPC_PREP || PPC_8xx
888 config CONSISTENT_SIZE_BOOL
889 bool "Set custom consistent memory pool size"
890 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
892 This option allows you to set the size of the
893 consistent memory pool. This pool of virtual memory
894 is used to make consistent memory allocations.
896 config CONSISTENT_SIZE
897 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
898 default "0x00200000" if NOT_COHERENT_CACHE
901 bool "Pinned Kernel TLBs (860 ONLY)"
902 depends on ADVANCED_OPTIONS && 8xx
907 bool "Build a relocatable kernel"
909 This builds a kernel image that is capable of running anywhere
910 in the RMA (real memory area) at any 16k-aligned base address.
911 The kernel is linked as a position-independent executable (PIE)
912 and contains dynamic relocations which are processed early
913 in the bootup process.
915 One use is for the kexec on panic case where the recovery kernel
916 must live at a different physical address than the primary
921 default "0xc000000000000000"
924 default "0xc000000000000000"
925 config PHYSICAL_START
932 source "drivers/Kconfig"
936 source "arch/powerpc/sysdev/qe_lib/Kconfig"
940 source "arch/powerpc/Kconfig.debug"
942 source "security/Kconfig"
946 depends on COMPAT && KEYS
949 source "crypto/Kconfig"
959 source "arch/powerpc/kvm/Kconfig"