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
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
204 config DEFAULT_UIMAGE
207 Used to allow a board to specify it wants a uImage built by default
213 config ARCH_HIBERNATION_POSSIBLE
217 config ARCH_SUSPEND_POSSIBLE
219 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_CPU_PROBE_RELEASE
326 depends on HOTPLUG_CPU
328 config ARCH_ENABLE_MEMORY_HOTPLUG
331 config ARCH_HAS_WALK_MEMORY
334 config ARCH_ENABLE_MEMORY_HOTREMOVE
338 bool "kexec system call (EXPERIMENTAL)"
339 depends on PPC_BOOK3S && EXPERIMENTAL
341 kexec is a system call that implements the ability to shutdown your
342 current kernel, and to start another kernel. It is like a reboot
343 but it is independent of the system firmware. And like a reboot
344 you can start any kernel with it, not just Linux.
346 The name comes from the similarity to the exec system call.
348 It is an ongoing process to be certain the hardware in a machine
349 is properly shutdown, so do not be surprised if this code does not
350 initially work for you. It may help to enable device hotplugging
351 support. As of this writing the exact hardware interface is
352 strongly in flux, so no good recommendation can be made.
355 bool "Build a kdump crash kernel"
356 depends on PPC64 || 6xx
357 select RELOCATABLE if PPC64
359 Build a kernel suitable for use as a kdump capture kernel.
360 The same kernel binary can be used as production kernel and dump
364 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
365 depends on PPC_PSERIES && EXPERIMENTAL
367 Hypervisor-assisted dump is meant to be a kdump replacement
368 offering robustness and speed not possible without system
369 hypervisor assistance.
374 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
375 default y if PPC_PREP
378 bool "Distribute interrupts on all CPUs by default"
379 depends on SMP && !MV64360
381 This option gives the kernel permission to distribute IRQs across
382 multiple CPUs. Saying N here will route all IRQs to the first
383 CPU. Generally saying Y is safe, although some problems have been
384 reported with SMP Power Macintoshes with this option enabled.
387 bool "Support sparse irq numbering"
390 This enables support for sparse irqs. This is useful for distro
391 kernels that want to define a high CONFIG_NR_CPUS value but still
392 want to have low kernel memory footprint on smaller machines.
394 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
395 out the irq_desc[] array in a more NUMA-friendly way. )
397 If you don't know what to do here, say Y.
402 default y if SMP && PPC_PSERIES
408 depends on NEED_MULTIPLE_NODES
410 config MAX_ACTIVE_REGIONS
412 default "256" if PPC64
415 config ARCH_SELECT_MEMORY_MODEL
419 config ARCH_FLATMEM_ENABLE
421 depends on (PPC64 && !NUMA) || PPC32
423 config ARCH_SPARSEMEM_ENABLE
426 select SPARSEMEM_VMEMMAP_ENABLE
428 config ARCH_SPARSEMEM_DEFAULT
430 depends on (SMP && PPC_PSERIES) || PPC_PS3
432 config ARCH_POPULATES_NODE_MAP
435 config SYS_SUPPORTS_HUGETLBFS
437 depends on PPC_BOOK3S_64
441 config ARCH_MEMORY_PROBE
443 depends on MEMORY_HOTPLUG
445 # Some NUMA nodes have memory ranges that span
446 # other nodes. Even though a pfn is valid and
447 # between a node's start and end pfns, it may not
448 # reside on that node. See memmap_init_zone()
450 config NODES_SPAN_OTHER_NODES
452 depends on NEED_MULTIPLE_NODES
454 config PPC_HAS_HASH_64K
460 bool "Using standard binutils settings"
464 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
465 Note, that kernel will be able to run only those applications,
466 which had been compiled using binutils later than 2.17.50.0.3 with
467 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
468 the older binutils, you can patch them with a trivial patch, which
469 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
475 Select the kernel logical page size. Increasing the page size
476 will reduce software overhead at each page boundary, allow
477 hardware prefetch mechanisms to be more effective, and allow
478 larger dma transfers increasing IO efficiency and reducing
479 overhead. However the utilization of memory will increase.
480 For example, each cached file will using a multiple of the
481 page size to hold its contents and the difference between the
482 end of file and the end of page is wasted.
484 Some dedicated systems, such as software raid serving with
485 accelerated calculations, have shown significant increases.
487 If you configure a 64 bit kernel for 64k pages but the
488 processor does not support them, then the kernel will simulate
489 them with 4k pages, loading them on demand, but with the
490 reduced software overhead and larger internal fragmentation.
491 For the 32 bit kernel, a large page option will not be offered
492 unless it is supported by the configured processor.
494 If unsure, choose 4K_PAGES.
500 bool "16k page size" if 44x
503 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
504 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
506 config PPC_256K_PAGES
507 bool "256k page size" if 44x
508 depends on !STDBINUTILS
510 Make the page size 256k.
512 As the ELF standard only requires alignment to support page
513 sizes up to 64k, you will need to compile all of your user
514 space applications with a non-standard binutils settings
515 (see the STDBINUTILS description for details).
517 Say N unless you know what you are doing.
521 config FORCE_MAX_ZONEORDER
522 int "Maximum zone order"
523 range 9 64 if PPC64 && PPC_64K_PAGES
524 default "9" if PPC64 && PPC_64K_PAGES
525 range 13 64 if PPC64 && !PPC_64K_PAGES
526 default "13" if PPC64 && !PPC_64K_PAGES
527 range 9 64 if PPC32 && PPC_16K_PAGES
528 default "9" if PPC32 && PPC_16K_PAGES
529 range 7 64 if PPC32 && PPC_64K_PAGES
530 default "7" if PPC32 && PPC_64K_PAGES
531 range 5 64 if PPC32 && PPC_256K_PAGES
532 default "5" if PPC32 && PPC_256K_PAGES
536 The kernel memory allocator divides physically contiguous memory
537 blocks into "zones", where each zone is a power of two number of
538 pages. This option selects the largest power of two that the kernel
539 keeps in the memory allocator. If you need to allocate very large
540 blocks of physically contiguous memory, then you may need to
543 This config option is actually maximum order plus one. For example,
544 a value of 11 means that the largest free memory block is 2^10 pages.
546 The page size is not necessarily 4KB. For example, on 64-bit
547 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
548 this in mind when choosing a value for this option.
550 config PPC_SUBPAGE_PROT
551 bool "Support setting protections for 4k subpages"
552 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
554 This option adds support for a system call to allow user programs
555 to set access permissions (read/write, readonly, or no access)
556 on the 4k subpages of each 64k page.
559 bool "SMT (Hyperthreading) scheduler support"
560 depends on PPC64 && SMP
562 SMT scheduler support improves the CPU scheduler's decision making
563 when dealing with POWER5 cpus at a cost of slightly increased
564 overhead in some places. If unsure say N here.
566 config PROC_DEVICETREE
567 bool "Support for device tree in /proc"
570 This option adds a device-tree directory under /proc which contains
571 an image of the device tree that the kernel copies from Open
572 Firmware or other boot firmware. If unsure, say Y here.
575 bool "Default bootloader kernel arguments"
578 string "Initial kernel command string"
579 depends on CMDLINE_BOOL
580 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
582 On some platforms, there is currently no way for the boot loader to
583 pass arguments to the kernel. For these platforms, you can supply
584 some command-line options at build time by entering them here. In
585 most cases you will need to specify the root device here.
588 string "Additional default image types"
590 List additional targets to be built by the bootwrapper here (separated
591 by spaces). This is useful for targets that depend of device tree
592 files in the .dts directory.
594 Targets in this list will be build as part of the default build
595 target, or when the user does a 'make zImage' or a
596 'make zImage.initrd'.
598 If unsure, leave blank
601 config ARCH_WANTS_FREEZER_CONTROL
605 source kernel/power/Kconfig
609 bool "Enable seccomp to safely compute untrusted bytecode"
613 This kernel feature is useful for number crunching applications
614 that may need to compute untrusted bytecode during their
615 execution. By using pipes or other transports made available to
616 the process as file descriptors supporting the read/write
617 syscalls, it's possible to isolate those applications in
618 their own address space using seccomp. Once seccomp is
619 enabled via /proc/<pid>/seccomp, it cannot be disabled
620 and the task is only allowed to execute a few safe syscalls
621 defined by each seccomp mode.
623 If unsure, say Y. Only embedded should say N here.
629 default !PPC_ISERIES || PCI
634 bool "Support for ISA-bus hardware"
635 depends on PPC_PREP || PPC_CHRP
638 Find out whether you have ISA slots on your motherboard. ISA is the
639 name of a bus system, i.e. the way the CPU talks to the other stuff
640 inside your box. If you have an Apple machine, say N here; if you
641 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
642 you have an embedded board, consult your board documentation.
648 config GENERIC_ISA_DMA
650 depends on PPC64 || POWER4 || 6xx && !CPM2
653 config PPC_INDIRECT_PCI
656 default y if 40x || 44x
670 select PPC_INDIRECT_PCI
676 depends on SUSPEND && (PPC_85xx || PPC_86xx)
678 Freescale MPC85xx/MPC86xx power management controller support
679 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
687 Freescale Localbus support
691 depends on PPC_83xx || QUICC_ENGINE || CPM2
693 Freescale General-purpose Timers support
695 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
699 # Platforms that what PCI turned unconditionally just do select PCI
700 # in their config node. Platforms that want to choose at config
701 # time should select PPC_PCI_CHOICE
702 config PPC_PCI_CHOICE
706 bool "PCI support" if PPC_PCI_CHOICE
707 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
708 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
709 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
710 default PCI_QSPAN if !4xx && !CPM2 && 8xx
711 select ARCH_SUPPORTS_MSI
713 Find out whether your system includes a PCI bus. PCI is the name of
714 a bus system, i.e. the way the CPU talks to the other stuff inside
715 your box. If you say Y here, the kernel will include drivers and
716 infrastructure code to support PCI bus devices.
726 depends on !4xx && !CPM2 && 8xx
729 Say Y here if you have a system based on a Motorola 8xx-series
730 embedded processor with a QSPAN PCI interface, otherwise say N.
734 depends on PCI && 8260
735 select PPC_INDIRECT_PCI
739 bool "Enable workaround for MPC826x erratum PCI 9"
740 depends on PCI_8260 && !8272
744 prompt "IDMA channel for PCI 9 workaround"
747 config 8260_PCI9_IDMA1
750 config 8260_PCI9_IDMA2
753 config 8260_PCI9_IDMA3
756 config 8260_PCI9_IDMA4
761 source "drivers/pci/pcie/Kconfig"
763 source "drivers/pci/Kconfig"
765 source "drivers/pcmcia/Kconfig"
767 source "drivers/pci/hotplug/Kconfig"
774 bool "RapidIO support"
775 depends on HAS_RAPIDIO
777 If you say Y here, the kernel will include drivers and
778 infrastructure code to support RapidIO interconnect devices.
780 source "drivers/rapidio/Kconfig"
784 menu "Advanced setup"
787 config ADVANCED_OPTIONS
788 bool "Prompt for advanced kernel configuration options"
790 This option will enable prompting for a variety of advanced kernel
791 configuration options. These options can cause the kernel to not
792 work if they are set incorrectly, but can be used to optimize certain
793 aspects of kernel memory management.
795 Unless you know what you are doing, say N here.
797 comment "Default settings for advanced configuration options are used"
798 depends on !ADVANCED_OPTIONS
800 config LOWMEM_SIZE_BOOL
801 bool "Set maximum low memory"
802 depends on ADVANCED_OPTIONS
804 This option allows you to set the maximum amount of memory which
805 will be used as "low memory", that is, memory which the kernel can
806 access directly, without having to set up a kernel virtual mapping.
807 This can be useful in optimizing the layout of kernel virtual
810 Say N here unless you know what you are doing.
813 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
816 config LOWMEM_CAM_NUM_BOOL
817 bool "Set number of CAMs to use to map low memory"
818 depends on ADVANCED_OPTIONS && FSL_BOOKE
820 This option allows you to set the maximum number of CAM slots that
821 will be used to map low memory. There are a limited number of slots
822 available and even more limited number that will fit in the L1 MMU.
823 However, using more entries will allow mapping more low memory. This
824 can be useful in optimizing the layout of kernel virtual memory.
826 Say N here unless you know what you are doing.
828 config LOWMEM_CAM_NUM
830 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
834 bool "Build a relocatable kernel (EXPERIMENTAL)"
835 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
837 This builds a kernel image that is capable of running at the
838 location the kernel is loaded at (some alignment restrictions may
841 One use is for the kexec on panic case where the recovery kernel
842 must live at a different physical address than the primary
845 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
846 it has been loaded at and the compile time physical addresses
847 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
848 setting can still be useful to bootwrappers that need to know the
849 load location of the kernel (eg. u-boot/mkimage).
851 config PAGE_OFFSET_BOOL
852 bool "Set custom page offset address"
853 depends on ADVANCED_OPTIONS
855 This option allows you to set the kernel virtual address at which
856 the kernel will map low memory. This can be useful in optimizing
857 the virtual memory layout of the system.
859 Say N here unless you know what you are doing.
862 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
865 config KERNEL_START_BOOL
866 bool "Set custom kernel base address"
867 depends on ADVANCED_OPTIONS
869 This option allows you to set the kernel virtual address at which
870 the kernel will be loaded. Normally this should match PAGE_OFFSET
871 however there are times (like kdump) that one might not want them
874 Say N here unless you know what you are doing.
877 hex "Virtual address of kernel base" if KERNEL_START_BOOL
878 default PAGE_OFFSET if PAGE_OFFSET_BOOL
879 default "0xc2000000" if CRASH_DUMP
882 config PHYSICAL_START_BOOL
883 bool "Set physical address where the kernel is loaded"
884 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
886 This gives the physical address where the kernel is loaded.
888 Say N here unless you know what you are doing.
890 config PHYSICAL_START
891 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
892 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
895 config PHYSICAL_ALIGN
897 default "0x04000000" if FSL_BOOKE
899 This value puts the alignment restrictions on physical address
900 where kernel is loaded and run from. Kernel is compiled for an
901 address which meets above alignment restriction.
903 config TASK_SIZE_BOOL
904 bool "Set custom user task size"
905 depends on ADVANCED_OPTIONS
907 This option allows you to set the amount of virtual address space
908 allocated to user tasks. This can be useful in optimizing the
909 virtual memory layout of the system.
911 Say N here unless you know what you are doing.
914 hex "Size of user task space" if TASK_SIZE_BOOL
915 default "0x80000000" if PPC_PREP || PPC_8xx
918 config CONSISTENT_SIZE_BOOL
919 bool "Set custom consistent memory pool size"
920 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
922 This option allows you to set the size of the
923 consistent memory pool. This pool of virtual memory
924 is used to make consistent memory allocations.
926 config CONSISTENT_SIZE
927 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
928 default "0x00200000" if NOT_COHERENT_CACHE
931 bool "Pinned Kernel TLBs (860 ONLY)"
932 depends on ADVANCED_OPTIONS && 8xx
937 bool "Build a relocatable kernel"
939 This builds a kernel image that is capable of running anywhere
940 in the RMA (real memory area) at any 16k-aligned base address.
941 The kernel is linked as a position-independent executable (PIE)
942 and contains dynamic relocations which are processed early
943 in the bootup process.
945 One use is for the kexec on panic case where the recovery kernel
946 must live at a different physical address than the primary
951 default "0xc000000000000000"
954 default "0xc000000000000000"
955 config PHYSICAL_START
962 source "drivers/Kconfig"
966 source "arch/powerpc/sysdev/qe_lib/Kconfig"
970 source "arch/powerpc/Kconfig.debug"
972 source "security/Kconfig"
976 depends on COMPAT && KEYS
979 source "crypto/Kconfig"
989 source "arch/powerpc/kvm/Kconfig"