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 config PPC_ADV_DEBUG_REGS
245 depends on 40x || BOOKE
248 config PPC_ADV_DEBUG_IACS
250 depends on PPC_ADV_DEBUG_REGS
254 config PPC_ADV_DEBUG_DACS
256 depends on PPC_ADV_DEBUG_REGS
259 config PPC_ADV_DEBUG_DVCS
261 depends on PPC_ADV_DEBUG_REGS
265 config PPC_ADV_DEBUG_DAC_RANGE
267 depends on PPC_ADV_DEBUG_REGS && 44x
270 source "init/Kconfig"
272 source "kernel/Kconfig.freezer"
274 source "arch/powerpc/sysdev/Kconfig"
275 source "arch/powerpc/platforms/Kconfig"
277 menu "Kernel options"
280 bool "High memory support"
283 source kernel/time/Kconfig
284 source kernel/Kconfig.hz
285 source kernel/Kconfig.preempt
286 source "fs/Kconfig.binfmt"
288 config HUGETLB_PAGE_SIZE_VARIABLE
290 depends on HUGETLB_PAGE
293 config MATH_EMULATION
294 bool "Math emulation"
295 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
297 Some PowerPC chips designed for embedded applications do not have
298 a floating-point unit and therefore do not implement the
299 floating-point instructions in the PowerPC instruction set. If you
300 say Y here, the kernel will include code to emulate a floating-point
301 unit, which will allow programs that use floating-point
304 config 8XX_MINIMAL_FPEMU
305 bool "Minimal math emulation for 8xx"
306 depends on 8xx && !MATH_EMULATION
308 Older arch/ppc kernels still emulated a few floating point
309 instructions such as load and store, even when full math
310 emulation is disabled. Say "Y" here if you want to preserve
313 It is recommended that you build a soft-float userspace instead.
316 bool "Enable IOMMU virtual merging"
320 Cause IO segments sent to a device for DMA to be merged virtually
321 by the IOMMU when they happen to have been allocated contiguously.
322 This doesn't add pressure to the IOMMU allocator. However, some
323 drivers don't support getting large merged segments coming back
326 Most drivers don't have this problem; it is safe to say Y here.
332 bool "SWIOTLB support"
336 Support for IO bounce buffering for systems without an IOMMU.
337 This allows us to DMA to the full physical address space on
338 platforms where the size of a physical address is larger
339 than the bus address. Not all platforms support this.
342 bool "Support for enabling/disabling CPUs"
343 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
345 Say Y here to be able to disable and re-enable individual
346 CPUs at runtime on SMP machines.
348 Say N if you are unsure.
350 config ARCH_CPU_PROBE_RELEASE
352 depends on HOTPLUG_CPU
354 config ARCH_ENABLE_MEMORY_HOTPLUG
357 config ARCH_HAS_WALK_MEMORY
360 config ARCH_ENABLE_MEMORY_HOTREMOVE
364 bool "kexec system call (EXPERIMENTAL)"
365 depends on PPC_BOOK3S && EXPERIMENTAL
367 kexec is a system call that implements the ability to shutdown your
368 current kernel, and to start another kernel. It is like a reboot
369 but it is independent of the system firmware. And like a reboot
370 you can start any kernel with it, not just Linux.
372 The name comes from the similarity to the exec system call.
374 It is an ongoing process to be certain the hardware in a machine
375 is properly shutdown, so do not be surprised if this code does not
376 initially work for you. It may help to enable device hotplugging
377 support. As of this writing the exact hardware interface is
378 strongly in flux, so no good recommendation can be made.
381 bool "Build a kdump crash kernel"
382 depends on PPC64 || 6xx
383 select RELOCATABLE if PPC64
385 Build a kernel suitable for use as a kdump capture kernel.
386 The same kernel binary can be used as production kernel and dump
390 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
391 depends on PPC_PSERIES && EXPERIMENTAL
393 Hypervisor-assisted dump is meant to be a kdump replacement
394 offering robustness and speed not possible without system
395 hypervisor assistance.
400 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
401 default y if PPC_PREP
404 bool "Distribute interrupts on all CPUs by default"
405 depends on SMP && !MV64360
407 This option gives the kernel permission to distribute IRQs across
408 multiple CPUs. Saying N here will route all IRQs to the first
409 CPU. Generally saying Y is safe, although some problems have been
410 reported with SMP Power Macintoshes with this option enabled.
413 bool "Support sparse irq numbering"
416 This enables support for sparse irqs. This is useful for distro
417 kernels that want to define a high CONFIG_NR_CPUS value but still
418 want to have low kernel memory footprint on smaller machines.
420 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
421 out the irq_desc[] array in a more NUMA-friendly way. )
423 If you don't know what to do here, say Y.
428 default y if SMP && PPC_PSERIES
434 depends on NEED_MULTIPLE_NODES
436 config MAX_ACTIVE_REGIONS
438 default "256" if PPC64
441 config ARCH_SELECT_MEMORY_MODEL
445 config ARCH_FLATMEM_ENABLE
447 depends on (PPC64 && !NUMA) || PPC32
449 config ARCH_SPARSEMEM_ENABLE
452 select SPARSEMEM_VMEMMAP_ENABLE
454 config ARCH_SPARSEMEM_DEFAULT
456 depends on (SMP && PPC_PSERIES) || PPC_PS3
458 config ARCH_POPULATES_NODE_MAP
461 config SYS_SUPPORTS_HUGETLBFS
463 depends on PPC_BOOK3S_64
467 config ARCH_MEMORY_PROBE
469 depends on MEMORY_HOTPLUG
471 # Some NUMA nodes have memory ranges that span
472 # other nodes. Even though a pfn is valid and
473 # between a node's start and end pfns, it may not
474 # reside on that node. See memmap_init_zone()
476 config NODES_SPAN_OTHER_NODES
478 depends on NEED_MULTIPLE_NODES
480 config PPC_HAS_HASH_64K
486 bool "Using standard binutils settings"
490 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
491 Note, that kernel will be able to run only those applications,
492 which had been compiled using binutils later than 2.17.50.0.3 with
493 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
494 the older binutils, you can patch them with a trivial patch, which
495 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
501 Select the kernel logical page size. Increasing the page size
502 will reduce software overhead at each page boundary, allow
503 hardware prefetch mechanisms to be more effective, and allow
504 larger dma transfers increasing IO efficiency and reducing
505 overhead. However the utilization of memory will increase.
506 For example, each cached file will using a multiple of the
507 page size to hold its contents and the difference between the
508 end of file and the end of page is wasted.
510 Some dedicated systems, such as software raid serving with
511 accelerated calculations, have shown significant increases.
513 If you configure a 64 bit kernel for 64k pages but the
514 processor does not support them, then the kernel will simulate
515 them with 4k pages, loading them on demand, but with the
516 reduced software overhead and larger internal fragmentation.
517 For the 32 bit kernel, a large page option will not be offered
518 unless it is supported by the configured processor.
520 If unsure, choose 4K_PAGES.
526 bool "16k page size" if 44x
529 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
530 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
532 config PPC_256K_PAGES
533 bool "256k page size" if 44x
534 depends on !STDBINUTILS
536 Make the page size 256k.
538 As the ELF standard only requires alignment to support page
539 sizes up to 64k, you will need to compile all of your user
540 space applications with a non-standard binutils settings
541 (see the STDBINUTILS description for details).
543 Say N unless you know what you are doing.
547 config FORCE_MAX_ZONEORDER
548 int "Maximum zone order"
549 range 9 64 if PPC64 && PPC_64K_PAGES
550 default "9" if PPC64 && PPC_64K_PAGES
551 range 13 64 if PPC64 && !PPC_64K_PAGES
552 default "13" if PPC64 && !PPC_64K_PAGES
553 range 9 64 if PPC32 && PPC_16K_PAGES
554 default "9" if PPC32 && PPC_16K_PAGES
555 range 7 64 if PPC32 && PPC_64K_PAGES
556 default "7" if PPC32 && PPC_64K_PAGES
557 range 5 64 if PPC32 && PPC_256K_PAGES
558 default "5" if PPC32 && PPC_256K_PAGES
562 The kernel memory allocator divides physically contiguous memory
563 blocks into "zones", where each zone is a power of two number of
564 pages. This option selects the largest power of two that the kernel
565 keeps in the memory allocator. If you need to allocate very large
566 blocks of physically contiguous memory, then you may need to
569 This config option is actually maximum order plus one. For example,
570 a value of 11 means that the largest free memory block is 2^10 pages.
572 The page size is not necessarily 4KB. For example, on 64-bit
573 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
574 this in mind when choosing a value for this option.
576 config PPC_SUBPAGE_PROT
577 bool "Support setting protections for 4k subpages"
578 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
580 This option adds support for a system call to allow user programs
581 to set access permissions (read/write, readonly, or no access)
582 on the 4k subpages of each 64k page.
585 bool "SMT (Hyperthreading) scheduler support"
586 depends on PPC64 && SMP
588 SMT scheduler support improves the CPU scheduler's decision making
589 when dealing with POWER5 cpus at a cost of slightly increased
590 overhead in some places. If unsure say N here.
592 config PROC_DEVICETREE
593 bool "Support for device tree in /proc"
596 This option adds a device-tree directory under /proc which contains
597 an image of the device tree that the kernel copies from Open
598 Firmware or other boot firmware. If unsure, say Y here.
601 bool "Default bootloader kernel arguments"
604 string "Initial kernel command string"
605 depends on CMDLINE_BOOL
606 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
608 On some platforms, there is currently no way for the boot loader to
609 pass arguments to the kernel. For these platforms, you can supply
610 some command-line options at build time by entering them here. In
611 most cases you will need to specify the root device here.
614 string "Additional default image types"
616 List additional targets to be built by the bootwrapper here (separated
617 by spaces). This is useful for targets that depend of device tree
618 files in the .dts directory.
620 Targets in this list will be build as part of the default build
621 target, or when the user does a 'make zImage' or a
622 'make zImage.initrd'.
624 If unsure, leave blank
627 config ARCH_WANTS_FREEZER_CONTROL
631 source kernel/power/Kconfig
635 bool "Enable seccomp to safely compute untrusted bytecode"
639 This kernel feature is useful for number crunching applications
640 that may need to compute untrusted bytecode during their
641 execution. By using pipes or other transports made available to
642 the process as file descriptors supporting the read/write
643 syscalls, it's possible to isolate those applications in
644 their own address space using seccomp. Once seccomp is
645 enabled via /proc/<pid>/seccomp, it cannot be disabled
646 and the task is only allowed to execute a few safe syscalls
647 defined by each seccomp mode.
649 If unsure, say Y. Only embedded should say N here.
655 default !PPC_ISERIES || PCI
660 bool "Support for ISA-bus hardware"
661 depends on PPC_PREP || PPC_CHRP
664 Find out whether you have ISA slots on your motherboard. ISA is the
665 name of a bus system, i.e. the way the CPU talks to the other stuff
666 inside your box. If you have an Apple machine, say N here; if you
667 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
668 you have an embedded board, consult your board documentation.
674 config GENERIC_ISA_DMA
676 depends on PPC64 || POWER4 || 6xx && !CPM2
679 config PPC_INDIRECT_PCI
682 default y if 40x || 44x
696 select PPC_INDIRECT_PCI
702 depends on SUSPEND && (PPC_85xx || PPC_86xx)
704 Freescale MPC85xx/MPC86xx power management controller support
705 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
713 Freescale Localbus support
717 depends on PPC_83xx || QUICC_ENGINE || CPM2
719 Freescale General-purpose Timers support
721 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
725 # Platforms that what PCI turned unconditionally just do select PCI
726 # in their config node. Platforms that want to choose at config
727 # time should select PPC_PCI_CHOICE
728 config PPC_PCI_CHOICE
732 bool "PCI support" if PPC_PCI_CHOICE
733 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
734 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
735 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
736 default PCI_QSPAN if !4xx && !CPM2 && 8xx
737 select ARCH_SUPPORTS_MSI
739 Find out whether your system includes a PCI bus. PCI is the name of
740 a bus system, i.e. the way the CPU talks to the other stuff inside
741 your box. If you say Y here, the kernel will include drivers and
742 infrastructure code to support PCI bus devices.
752 depends on !4xx && !CPM2 && 8xx
755 Say Y here if you have a system based on a Motorola 8xx-series
756 embedded processor with a QSPAN PCI interface, otherwise say N.
760 depends on PCI && 8260
761 select PPC_INDIRECT_PCI
765 bool "Enable workaround for MPC826x erratum PCI 9"
766 depends on PCI_8260 && !8272
770 prompt "IDMA channel for PCI 9 workaround"
773 config 8260_PCI9_IDMA1
776 config 8260_PCI9_IDMA2
779 config 8260_PCI9_IDMA3
782 config 8260_PCI9_IDMA4
787 source "drivers/pci/pcie/Kconfig"
789 source "drivers/pci/Kconfig"
791 source "drivers/pcmcia/Kconfig"
793 source "drivers/pci/hotplug/Kconfig"
800 bool "RapidIO support"
801 depends on HAS_RAPIDIO
803 If you say Y here, the kernel will include drivers and
804 infrastructure code to support RapidIO interconnect devices.
806 source "drivers/rapidio/Kconfig"
810 menu "Advanced setup"
813 config ADVANCED_OPTIONS
814 bool "Prompt for advanced kernel configuration options"
816 This option will enable prompting for a variety of advanced kernel
817 configuration options. These options can cause the kernel to not
818 work if they are set incorrectly, but can be used to optimize certain
819 aspects of kernel memory management.
821 Unless you know what you are doing, say N here.
823 comment "Default settings for advanced configuration options are used"
824 depends on !ADVANCED_OPTIONS
826 config LOWMEM_SIZE_BOOL
827 bool "Set maximum low memory"
828 depends on ADVANCED_OPTIONS
830 This option allows you to set the maximum amount of memory which
831 will be used as "low memory", that is, memory which the kernel can
832 access directly, without having to set up a kernel virtual mapping.
833 This can be useful in optimizing the layout of kernel virtual
836 Say N here unless you know what you are doing.
839 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
842 config LOWMEM_CAM_NUM_BOOL
843 bool "Set number of CAMs to use to map low memory"
844 depends on ADVANCED_OPTIONS && FSL_BOOKE
846 This option allows you to set the maximum number of CAM slots that
847 will be used to map low memory. There are a limited number of slots
848 available and even more limited number that will fit in the L1 MMU.
849 However, using more entries will allow mapping more low memory. This
850 can be useful in optimizing the layout of kernel virtual memory.
852 Say N here unless you know what you are doing.
854 config LOWMEM_CAM_NUM
856 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
860 bool "Build a relocatable kernel (EXPERIMENTAL)"
861 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
863 This builds a kernel image that is capable of running at the
864 location the kernel is loaded at (some alignment restrictions may
867 One use is for the kexec on panic case where the recovery kernel
868 must live at a different physical address than the primary
871 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
872 it has been loaded at and the compile time physical addresses
873 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
874 setting can still be useful to bootwrappers that need to know the
875 load location of the kernel (eg. u-boot/mkimage).
877 config PAGE_OFFSET_BOOL
878 bool "Set custom page offset address"
879 depends on ADVANCED_OPTIONS
881 This option allows you to set the kernel virtual address at which
882 the kernel will map low memory. This can be useful in optimizing
883 the virtual memory layout of the system.
885 Say N here unless you know what you are doing.
888 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
891 config KERNEL_START_BOOL
892 bool "Set custom kernel base address"
893 depends on ADVANCED_OPTIONS
895 This option allows you to set the kernel virtual address at which
896 the kernel will be loaded. Normally this should match PAGE_OFFSET
897 however there are times (like kdump) that one might not want them
900 Say N here unless you know what you are doing.
903 hex "Virtual address of kernel base" if KERNEL_START_BOOL
904 default PAGE_OFFSET if PAGE_OFFSET_BOOL
905 default "0xc2000000" if CRASH_DUMP
908 config PHYSICAL_START_BOOL
909 bool "Set physical address where the kernel is loaded"
910 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
912 This gives the physical address where the kernel is loaded.
914 Say N here unless you know what you are doing.
916 config PHYSICAL_START
917 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
918 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
921 config PHYSICAL_ALIGN
923 default "0x04000000" if FSL_BOOKE
925 This value puts the alignment restrictions on physical address
926 where kernel is loaded and run from. Kernel is compiled for an
927 address which meets above alignment restriction.
929 config TASK_SIZE_BOOL
930 bool "Set custom user task size"
931 depends on ADVANCED_OPTIONS
933 This option allows you to set the amount of virtual address space
934 allocated to user tasks. This can be useful in optimizing the
935 virtual memory layout of the system.
937 Say N here unless you know what you are doing.
940 hex "Size of user task space" if TASK_SIZE_BOOL
941 default "0x80000000" if PPC_PREP || PPC_8xx
944 config CONSISTENT_SIZE_BOOL
945 bool "Set custom consistent memory pool size"
946 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
948 This option allows you to set the size of the
949 consistent memory pool. This pool of virtual memory
950 is used to make consistent memory allocations.
952 config CONSISTENT_SIZE
953 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
954 default "0x00200000" if NOT_COHERENT_CACHE
957 bool "Pinned Kernel TLBs (860 ONLY)"
958 depends on ADVANCED_OPTIONS && 8xx
963 bool "Build a relocatable kernel"
965 This builds a kernel image that is capable of running anywhere
966 in the RMA (real memory area) at any 16k-aligned base address.
967 The kernel is linked as a position-independent executable (PIE)
968 and contains dynamic relocations which are processed early
969 in the bootup process.
971 One use is for the kexec on panic case where the recovery kernel
972 must live at a different physical address than the primary
977 default "0xc000000000000000"
980 default "0xc000000000000000"
981 config PHYSICAL_START
988 source "drivers/Kconfig"
992 source "arch/powerpc/sysdev/qe_lib/Kconfig"
996 source "arch/powerpc/Kconfig.debug"
998 source "security/Kconfig"
1002 depends on COMPAT && KEYS
1005 source "crypto/Kconfig"
1012 config PPC_LIB_RHEAP
1015 source "arch/powerpc/kvm/Kconfig"