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
154 select COMPAT_BINFMT_ELF
156 config SYSVIPC_COMPAT
158 depends on COMPAT && SYSVIPC
161 # All PPC32s use generic nvram driver through ppc_md
166 config SCHED_OMIT_FRAME_POINTER
170 config ARCH_MAY_HAVE_PC_FDC
172 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.
319 bool "SWIOTLB support"
323 Support for IO bounce buffering for systems without an IOMMU.
324 This allows us to DMA to the full physical address space on
325 platforms where the size of a physical address is larger
326 than the bus address. Not all platforms support this.
329 bool "Support for enabling/disabling CPUs"
330 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
332 Say Y here to be able to disable and re-enable individual
333 CPUs at runtime on SMP machines.
335 Say N if you are unsure.
337 config ARCH_CPU_PROBE_RELEASE
339 depends on HOTPLUG_CPU
341 config ARCH_ENABLE_MEMORY_HOTPLUG
344 config ARCH_HAS_WALK_MEMORY
347 config ARCH_ENABLE_MEMORY_HOTREMOVE
351 bool "kexec system call (EXPERIMENTAL)"
352 depends on (PPC_BOOK3S || (FSL_BOOKE && !SMP)) && EXPERIMENTAL
354 kexec is a system call that implements the ability to shutdown your
355 current kernel, and to start another kernel. It is like a reboot
356 but it is independent of the system firmware. And like a reboot
357 you can start any kernel with it, not just Linux.
359 The name comes from the similarity to the exec system call.
361 It is an ongoing process to be certain the hardware in a machine
362 is properly shutdown, so do not be surprised if this code does not
363 initially work for you. It may help to enable device hotplugging
364 support. As of this writing the exact hardware interface is
365 strongly in flux, so no good recommendation can be made.
368 bool "Build a kdump crash kernel"
369 depends on PPC64 || 6xx
370 select RELOCATABLE if PPC64
372 Build a kernel suitable for use as a kdump capture kernel.
373 The same kernel binary can be used as production kernel and dump
377 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
378 depends on PPC_PSERIES && EXPERIMENTAL
380 Hypervisor-assisted dump is meant to be a kdump replacement
381 offering robustness and speed not possible without system
382 hypervisor assistance.
387 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
388 default y if PPC_PREP
391 bool "Distribute interrupts on all CPUs by default"
392 depends on SMP && !MV64360
394 This option gives the kernel permission to distribute IRQs across
395 multiple CPUs. Saying N here will route all IRQs to the first
396 CPU. Generally saying Y is safe, although some problems have been
397 reported with SMP Power Macintoshes with this option enabled.
400 bool "Support sparse irq numbering"
403 This enables support for sparse irqs. This is useful for distro
404 kernels that want to define a high CONFIG_NR_CPUS value but still
405 want to have low kernel memory footprint on smaller machines.
407 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
408 out the irq_desc[] array in a more NUMA-friendly way. )
410 If you don't know what to do here, say Y.
415 default y if SMP && PPC_PSERIES
421 depends on NEED_MULTIPLE_NODES
423 config MAX_ACTIVE_REGIONS
425 default "256" if PPC64
428 config ARCH_SELECT_MEMORY_MODEL
432 config ARCH_FLATMEM_ENABLE
434 depends on (PPC64 && !NUMA) || PPC32
436 config ARCH_SPARSEMEM_ENABLE
439 select SPARSEMEM_VMEMMAP_ENABLE
441 config ARCH_SPARSEMEM_DEFAULT
443 depends on (SMP && PPC_PSERIES) || PPC_PS3
445 config ARCH_POPULATES_NODE_MAP
448 config SYS_SUPPORTS_HUGETLBFS
450 depends on PPC_BOOK3S_64
454 config ARCH_MEMORY_PROBE
456 depends on MEMORY_HOTPLUG
458 # Some NUMA nodes have memory ranges that span
459 # other nodes. Even though a pfn is valid and
460 # between a node's start and end pfns, it may not
461 # reside on that node. See memmap_init_zone()
463 config NODES_SPAN_OTHER_NODES
465 depends on NEED_MULTIPLE_NODES
467 config PPC_HAS_HASH_64K
473 bool "Using standard binutils settings"
477 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
478 Note, that kernel will be able to run only those applications,
479 which had been compiled using binutils later than 2.17.50.0.3 with
480 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
481 the older binutils, you can patch them with a trivial patch, which
482 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
488 Select the kernel logical page size. Increasing the page size
489 will reduce software overhead at each page boundary, allow
490 hardware prefetch mechanisms to be more effective, and allow
491 larger dma transfers increasing IO efficiency and reducing
492 overhead. However the utilization of memory will increase.
493 For example, each cached file will using a multiple of the
494 page size to hold its contents and the difference between the
495 end of file and the end of page is wasted.
497 Some dedicated systems, such as software raid serving with
498 accelerated calculations, have shown significant increases.
500 If you configure a 64 bit kernel for 64k pages but the
501 processor does not support them, then the kernel will simulate
502 them with 4k pages, loading them on demand, but with the
503 reduced software overhead and larger internal fragmentation.
504 For the 32 bit kernel, a large page option will not be offered
505 unless it is supported by the configured processor.
507 If unsure, choose 4K_PAGES.
513 bool "16k page size" if 44x
516 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
517 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
519 config PPC_256K_PAGES
520 bool "256k page size" if 44x
521 depends on !STDBINUTILS
523 Make the page size 256k.
525 As the ELF standard only requires alignment to support page
526 sizes up to 64k, you will need to compile all of your user
527 space applications with a non-standard binutils settings
528 (see the STDBINUTILS description for details).
530 Say N unless you know what you are doing.
534 config FORCE_MAX_ZONEORDER
535 int "Maximum zone order"
536 range 9 64 if PPC64 && PPC_64K_PAGES
537 default "9" if PPC64 && PPC_64K_PAGES
538 range 13 64 if PPC64 && !PPC_64K_PAGES
539 default "13" if PPC64 && !PPC_64K_PAGES
540 range 9 64 if PPC32 && PPC_16K_PAGES
541 default "9" if PPC32 && PPC_16K_PAGES
542 range 7 64 if PPC32 && PPC_64K_PAGES
543 default "7" if PPC32 && PPC_64K_PAGES
544 range 5 64 if PPC32 && PPC_256K_PAGES
545 default "5" if PPC32 && PPC_256K_PAGES
549 The kernel memory allocator divides physically contiguous memory
550 blocks into "zones", where each zone is a power of two number of
551 pages. This option selects the largest power of two that the kernel
552 keeps in the memory allocator. If you need to allocate very large
553 blocks of physically contiguous memory, then you may need to
556 This config option is actually maximum order plus one. For example,
557 a value of 11 means that the largest free memory block is 2^10 pages.
559 The page size is not necessarily 4KB. For example, on 64-bit
560 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
561 this in mind when choosing a value for this option.
563 config PPC_SUBPAGE_PROT
564 bool "Support setting protections for 4k subpages"
565 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
567 This option adds support for a system call to allow user programs
568 to set access permissions (read/write, readonly, or no access)
569 on the 4k subpages of each 64k page.
572 bool "SMT (Hyperthreading) scheduler support"
573 depends on PPC64 && SMP
575 SMT scheduler support improves the CPU scheduler's decision making
576 when dealing with POWER5 cpus at a cost of slightly increased
577 overhead in some places. If unsure say N here.
579 config PROC_DEVICETREE
580 bool "Support for device tree in /proc"
583 This option adds a device-tree directory under /proc which contains
584 an image of the device tree that the kernel copies from Open
585 Firmware or other boot firmware. If unsure, say Y here.
588 bool "Default bootloader kernel arguments"
591 string "Initial kernel command string"
592 depends on CMDLINE_BOOL
593 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
595 On some platforms, there is currently no way for the boot loader to
596 pass arguments to the kernel. For these platforms, you can supply
597 some command-line options at build time by entering them here. In
598 most cases you will need to specify the root device here.
601 string "Additional default image types"
603 List additional targets to be built by the bootwrapper here (separated
604 by spaces). This is useful for targets that depend of device tree
605 files in the .dts directory.
607 Targets in this list will be build as part of the default build
608 target, or when the user does a 'make zImage' or a
609 'make zImage.initrd'.
611 If unsure, leave blank
614 config ARCH_WANTS_FREEZER_CONTROL
618 source kernel/power/Kconfig
622 bool "Enable seccomp to safely compute untrusted bytecode"
626 This kernel feature is useful for number crunching applications
627 that may need to compute untrusted bytecode during their
628 execution. By using pipes or other transports made available to
629 the process as file descriptors supporting the read/write
630 syscalls, it's possible to isolate those applications in
631 their own address space using seccomp. Once seccomp is
632 enabled via /proc/<pid>/seccomp, it cannot be disabled
633 and the task is only allowed to execute a few safe syscalls
634 defined by each seccomp mode.
636 If unsure, say Y. Only embedded should say N here.
642 default !PPC_ISERIES || PCI
647 bool "Support for ISA-bus hardware"
648 depends on PPC_PREP || PPC_CHRP
651 Find out whether you have ISA slots on your motherboard. ISA is the
652 name of a bus system, i.e. the way the CPU talks to the other stuff
653 inside your box. If you have an Apple machine, say N here; if you
654 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
655 you have an embedded board, consult your board documentation.
661 config NEED_DMA_MAP_STATE
662 def_bool (PPC64 || NOT_COHERENT_CACHE)
664 config NEED_SG_DMA_LENGTH
667 config GENERIC_ISA_DMA
669 depends on PPC64 || POWER4 || 6xx && !CPM2
672 config PPC_INDIRECT_PCI
675 default y if 40x || 44x
689 select PPC_INDIRECT_PCI
695 depends on SUSPEND && (PPC_85xx || PPC_86xx)
697 Freescale MPC85xx/MPC86xx power management controller support
698 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
706 Freescale Localbus support
710 depends on PPC_83xx || QUICC_ENGINE || CPM2
712 Freescale General-purpose Timers support
714 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
718 # Platforms that what PCI turned unconditionally just do select PCI
719 # in their config node. Platforms that want to choose at config
720 # time should select PPC_PCI_CHOICE
721 config PPC_PCI_CHOICE
725 bool "PCI support" if PPC_PCI_CHOICE
726 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
727 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
728 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
729 default PCI_QSPAN if !4xx && !CPM2 && 8xx
730 select ARCH_SUPPORTS_MSI
732 Find out whether your system includes a PCI bus. PCI is the name of
733 a bus system, i.e. the way the CPU talks to the other stuff inside
734 your box. If you say Y here, the kernel will include drivers and
735 infrastructure code to support PCI bus devices.
745 depends on !4xx && !CPM2 && 8xx
748 Say Y here if you have a system based on a Motorola 8xx-series
749 embedded processor with a QSPAN PCI interface, otherwise say N.
753 depends on PCI && 8260
754 select PPC_INDIRECT_PCI
758 bool "Enable workaround for MPC826x erratum PCI 9"
759 depends on PCI_8260 && !8272
763 prompt "IDMA channel for PCI 9 workaround"
766 config 8260_PCI9_IDMA1
769 config 8260_PCI9_IDMA2
772 config 8260_PCI9_IDMA3
775 config 8260_PCI9_IDMA4
780 source "drivers/pci/pcie/Kconfig"
782 source "drivers/pci/Kconfig"
784 source "drivers/pcmcia/Kconfig"
786 source "drivers/pci/hotplug/Kconfig"
793 bool "RapidIO support"
794 depends on HAS_RAPIDIO
796 If you say Y here, the kernel will include drivers and
797 infrastructure code to support RapidIO interconnect devices.
799 source "drivers/rapidio/Kconfig"
803 menu "Advanced setup"
806 config ADVANCED_OPTIONS
807 bool "Prompt for advanced kernel configuration options"
809 This option will enable prompting for a variety of advanced kernel
810 configuration options. These options can cause the kernel to not
811 work if they are set incorrectly, but can be used to optimize certain
812 aspects of kernel memory management.
814 Unless you know what you are doing, say N here.
816 comment "Default settings for advanced configuration options are used"
817 depends on !ADVANCED_OPTIONS
819 config LOWMEM_SIZE_BOOL
820 bool "Set maximum low memory"
821 depends on ADVANCED_OPTIONS
823 This option allows you to set the maximum amount of memory which
824 will be used as "low memory", that is, memory which the kernel can
825 access directly, without having to set up a kernel virtual mapping.
826 This can be useful in optimizing the layout of kernel virtual
829 Say N here unless you know what you are doing.
832 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
835 config LOWMEM_CAM_NUM_BOOL
836 bool "Set number of CAMs to use to map low memory"
837 depends on ADVANCED_OPTIONS && FSL_BOOKE
839 This option allows you to set the maximum number of CAM slots that
840 will be used to map low memory. There are a limited number of slots
841 available and even more limited number that will fit in the L1 MMU.
842 However, using more entries will allow mapping more low memory. This
843 can be useful in optimizing the layout of kernel virtual memory.
845 Say N here unless you know what you are doing.
847 config LOWMEM_CAM_NUM
849 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
853 bool "Build a relocatable kernel (EXPERIMENTAL)"
854 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
856 This builds a kernel image that is capable of running at the
857 location the kernel is loaded at (some alignment restrictions may
860 One use is for the kexec on panic case where the recovery kernel
861 must live at a different physical address than the primary
864 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
865 it has been loaded at and the compile time physical addresses
866 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
867 setting can still be useful to bootwrappers that need to know the
868 load location of the kernel (eg. u-boot/mkimage).
870 config PAGE_OFFSET_BOOL
871 bool "Set custom page offset address"
872 depends on ADVANCED_OPTIONS
874 This option allows you to set the kernel virtual address at which
875 the kernel will map low memory. This can be useful in optimizing
876 the virtual memory layout of the system.
878 Say N here unless you know what you are doing.
881 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
884 config KERNEL_START_BOOL
885 bool "Set custom kernel base address"
886 depends on ADVANCED_OPTIONS
888 This option allows you to set the kernel virtual address at which
889 the kernel will be loaded. Normally this should match PAGE_OFFSET
890 however there are times (like kdump) that one might not want them
893 Say N here unless you know what you are doing.
896 hex "Virtual address of kernel base" if KERNEL_START_BOOL
897 default PAGE_OFFSET if PAGE_OFFSET_BOOL
898 default "0xc2000000" if CRASH_DUMP
901 config PHYSICAL_START_BOOL
902 bool "Set physical address where the kernel is loaded"
903 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
905 This gives the physical address where the kernel is loaded.
907 Say N here unless you know what you are doing.
909 config PHYSICAL_START
910 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
911 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
914 config PHYSICAL_ALIGN
916 default "0x04000000" if FSL_BOOKE
918 This value puts the alignment restrictions on physical address
919 where kernel is loaded and run from. Kernel is compiled for an
920 address which meets above alignment restriction.
922 config TASK_SIZE_BOOL
923 bool "Set custom user task size"
924 depends on ADVANCED_OPTIONS
926 This option allows you to set the amount of virtual address space
927 allocated to user tasks. This can be useful in optimizing the
928 virtual memory layout of the system.
930 Say N here unless you know what you are doing.
933 hex "Size of user task space" if TASK_SIZE_BOOL
934 default "0x80000000" if PPC_PREP || PPC_8xx
937 config CONSISTENT_SIZE_BOOL
938 bool "Set custom consistent memory pool size"
939 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
941 This option allows you to set the size of the
942 consistent memory pool. This pool of virtual memory
943 is used to make consistent memory allocations.
945 config CONSISTENT_SIZE
946 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
947 default "0x00200000" if NOT_COHERENT_CACHE
950 bool "Pinned Kernel TLBs (860 ONLY)"
951 depends on ADVANCED_OPTIONS && 8xx
956 bool "Build a relocatable kernel"
958 This builds a kernel image that is capable of running anywhere
959 in the RMA (real memory area) at any 16k-aligned base address.
960 The kernel is linked as a position-independent executable (PIE)
961 and contains dynamic relocations which are processed early
962 in the bootup process.
964 One use is for the kexec on panic case where the recovery kernel
965 must live at a different physical address than the primary
970 default "0xc000000000000000"
973 default "0xc000000000000000"
974 config PHYSICAL_START
981 source "drivers/Kconfig"
985 source "arch/powerpc/sysdev/qe_lib/Kconfig"
989 source "arch/powerpc/Kconfig.debug"
991 source "security/Kconfig"
995 depends on COMPAT && KEYS
998 source "crypto/Kconfig"
1005 config PPC_LIB_RHEAP
1008 source "arch/powerpc/kvm/Kconfig"