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
32 config GENERIC_TIME_VSYSCALL
35 config GENERIC_CLOCKEVENTS
38 config GENERIC_HARDIRQS
42 config GENERIC_HARDIRQS_NO__DO_IRQ
46 config HAVE_SETUP_PER_CPU_AREA
49 config NEED_PER_CPU_EMBED_FIRST_CHUNK
57 int "Number of virtual interrupt numbers"
61 This defines the number of virtual interrupt numbers the kernel
62 can manage. Virtual interrupt numbers are what you see in
63 /proc/interrupts. If you configure your system to have too few,
64 drivers will fail to load or worse - handle with care.
66 config STACKTRACE_SUPPORT
70 config HAVE_LATENCYTOP_SUPPORT
73 config TRACE_IRQFLAGS_SUPPORT
77 config LOCKDEP_SUPPORT
81 config RWSEM_GENERIC_SPINLOCK
84 config RWSEM_XCHGADD_ALGORITHM
88 config GENERIC_LOCKBREAK
91 depends on SMP && PREEMPT
93 config ARCH_HAS_ILOG2_U32
97 config ARCH_HAS_ILOG2_U64
101 config GENERIC_HWEIGHT
105 config GENERIC_FIND_NEXT_BIT
112 Generic GPIO API support
114 config ARCH_NO_VIRT_TO_BUS
122 select HAVE_FTRACE_MCOUNT_RECORD
123 select HAVE_DYNAMIC_FTRACE
124 select HAVE_FUNCTION_TRACER
125 select HAVE_FUNCTION_GRAPH_TRACER
126 select ARCH_WANT_OPTIONAL_GPIOLIB
128 select HAVE_IOREMAP_PROT
129 select HAVE_EFFICIENT_UNALIGNED_ACCESS
131 select HAVE_ARCH_KGDB
132 select HAVE_KRETPROBES
133 select HAVE_ARCH_TRACEHOOK
135 select HAVE_DMA_ATTRS
136 select HAVE_DMA_API_DEBUG
137 select USE_GENERIC_SMP_HELPERS if SMP
139 select HAVE_SYSCALL_WRAPPERS if PPC64
140 select GENERIC_ATOMIC64 if PPC32
141 select HAVE_PERF_EVENTS
142 select HAVE_REGS_AND_STACK_ACCESS_API
143 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
152 select COMPAT_BINFMT_ELF
154 config SYSVIPC_COMPAT
156 depends on COMPAT && SYSVIPC
159 # All PPC32s use generic nvram driver through ppc_md
164 config SCHED_OMIT_FRAME_POINTER
168 config ARCH_MAY_HAVE_PC_FDC
170 default !PPC_PSERIES || PCI
175 config PPC_UDBG_16550
179 config GENERIC_TBSYNC
181 default y if PPC32 && SMP
193 config SYS_SUPPORTS_APM_EMULATION
194 default y if PMAC_APM_EMU
197 config DEFAULT_UIMAGE
200 Used to allow a board to specify it wants a uImage built by default
206 config ARCH_HIBERNATION_POSSIBLE
210 config ARCH_SUSPEND_POSSIBLE
212 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
213 PPC_85xx || PPC_86xx || PPC_PSERIES
215 config PPC_DCR_NATIVE
225 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
228 config PPC_OF_PLATFORM_PCI
231 depends on PPC64 # not supported on 32 bits yet
234 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
237 config PPC_ADV_DEBUG_REGS
239 depends on 40x || BOOKE
242 config PPC_ADV_DEBUG_IACS
244 depends on PPC_ADV_DEBUG_REGS
248 config PPC_ADV_DEBUG_DACS
250 depends on PPC_ADV_DEBUG_REGS
253 config PPC_ADV_DEBUG_DVCS
255 depends on PPC_ADV_DEBUG_REGS
259 config PPC_ADV_DEBUG_DAC_RANGE
261 depends on PPC_ADV_DEBUG_REGS && 44x
264 source "init/Kconfig"
266 source "kernel/Kconfig.freezer"
268 source "arch/powerpc/sysdev/Kconfig"
269 source "arch/powerpc/platforms/Kconfig"
271 menu "Kernel options"
274 bool "High memory support"
277 source kernel/time/Kconfig
278 source kernel/Kconfig.hz
279 source kernel/Kconfig.preempt
280 source "fs/Kconfig.binfmt"
282 config HUGETLB_PAGE_SIZE_VARIABLE
284 depends on HUGETLB_PAGE
287 config MATH_EMULATION
288 bool "Math emulation"
289 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
291 Some PowerPC chips designed for embedded applications do not have
292 a floating-point unit and therefore do not implement the
293 floating-point instructions in the PowerPC instruction set. If you
294 say Y here, the kernel will include code to emulate a floating-point
295 unit, which will allow programs that use floating-point
298 config 8XX_MINIMAL_FPEMU
299 bool "Minimal math emulation for 8xx"
300 depends on 8xx && !MATH_EMULATION
302 Older arch/ppc kernels still emulated a few floating point
303 instructions such as load and store, even when full math
304 emulation is disabled. Say "Y" here if you want to preserve
307 It is recommended that you build a soft-float userspace instead.
313 bool "SWIOTLB support"
317 Support for IO bounce buffering for systems without an IOMMU.
318 This allows us to DMA to the full physical address space on
319 platforms where the size of a physical address is larger
320 than the bus address. Not all platforms support this.
323 bool "Support for enabling/disabling CPUs"
324 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
326 Say Y here to be able to disable and re-enable individual
327 CPUs at runtime on SMP machines.
329 Say N if you are unsure.
331 config ARCH_CPU_PROBE_RELEASE
333 depends on HOTPLUG_CPU
335 config ARCH_ENABLE_MEMORY_HOTPLUG
338 config ARCH_HAS_WALK_MEMORY
341 config ARCH_ENABLE_MEMORY_HOTREMOVE
345 bool "kexec system call (EXPERIMENTAL)"
346 depends on (PPC_BOOK3S || FSL_BOOKE) && EXPERIMENTAL
348 kexec is a system call that implements the ability to shutdown your
349 current kernel, and to start another kernel. It is like a reboot
350 but it is independent of the system firmware. And like a reboot
351 you can start any kernel with it, not just Linux.
353 The name comes from the similarity to the exec system call.
355 It is an ongoing process to be certain the hardware in a machine
356 is properly shutdown, so do not be surprised if this code does not
357 initially work for you. It may help to enable device hotplugging
358 support. As of this writing the exact hardware interface is
359 strongly in flux, so no good recommendation can be made.
362 bool "Build a kdump crash kernel"
363 depends on PPC64 || 6xx || FSL_BOOKE
364 select RELOCATABLE if PPC64 || FSL_BOOKE
366 Build a kernel suitable for use as a kdump capture kernel.
367 The same kernel binary can be used as production kernel and dump
371 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
372 depends on PPC_PSERIES && EXPERIMENTAL
374 Hypervisor-assisted dump is meant to be a kdump replacement
375 offering robustness and speed not possible without system
376 hypervisor assistance.
381 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
382 default y if PPC_PREP
385 bool "Distribute interrupts on all CPUs by default"
386 depends on SMP && !MV64360
388 This option gives the kernel permission to distribute IRQs across
389 multiple CPUs. Saying N here will route all IRQs to the first
390 CPU. Generally saying Y is safe, although some problems have been
391 reported with SMP Power Macintoshes with this option enabled.
394 bool "Support sparse irq numbering"
397 This enables support for sparse irqs. This is useful for distro
398 kernels that want to define a high CONFIG_NR_CPUS value but still
399 want to have low kernel memory footprint on smaller machines.
401 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
402 out the irq_desc[] array in a more NUMA-friendly way. )
404 If you don't know what to do here, say N.
409 default y if SMP && PPC_PSERIES
415 depends on NEED_MULTIPLE_NODES
417 config MAX_ACTIVE_REGIONS
419 default "256" if PPC64
422 config ARCH_SELECT_MEMORY_MODEL
426 config ARCH_FLATMEM_ENABLE
428 depends on (PPC64 && !NUMA) || PPC32
430 config ARCH_SPARSEMEM_ENABLE
433 select SPARSEMEM_VMEMMAP_ENABLE
435 config ARCH_SPARSEMEM_DEFAULT
437 depends on (SMP && PPC_PSERIES) || PPC_PS3
439 config ARCH_POPULATES_NODE_MAP
442 config SYS_SUPPORTS_HUGETLBFS
444 depends on PPC_BOOK3S_64
448 config ARCH_MEMORY_PROBE
450 depends on MEMORY_HOTPLUG
452 # Some NUMA nodes have memory ranges that span
453 # other nodes. Even though a pfn is valid and
454 # between a node's start and end pfns, it may not
455 # reside on that node. See memmap_init_zone()
457 config NODES_SPAN_OTHER_NODES
459 depends on NEED_MULTIPLE_NODES
461 config PPC_HAS_HASH_64K
467 bool "Using standard binutils settings"
471 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
472 Note, that kernel will be able to run only those applications,
473 which had been compiled using binutils later than 2.17.50.0.3 with
474 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
475 the older binutils, you can patch them with a trivial patch, which
476 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
482 Select the kernel logical page size. Increasing the page size
483 will reduce software overhead at each page boundary, allow
484 hardware prefetch mechanisms to be more effective, and allow
485 larger dma transfers increasing IO efficiency and reducing
486 overhead. However the utilization of memory will increase.
487 For example, each cached file will using a multiple of the
488 page size to hold its contents and the difference between the
489 end of file and the end of page is wasted.
491 Some dedicated systems, such as software raid serving with
492 accelerated calculations, have shown significant increases.
494 If you configure a 64 bit kernel for 64k pages but the
495 processor does not support them, then the kernel will simulate
496 them with 4k pages, loading them on demand, but with the
497 reduced software overhead and larger internal fragmentation.
498 For the 32 bit kernel, a large page option will not be offered
499 unless it is supported by the configured processor.
501 If unsure, choose 4K_PAGES.
507 bool "16k page size" if 44x
510 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
511 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
513 config PPC_256K_PAGES
514 bool "256k page size" if 44x
515 depends on !STDBINUTILS
517 Make the page size 256k.
519 As the ELF standard only requires alignment to support page
520 sizes up to 64k, you will need to compile all of your user
521 space applications with a non-standard binutils settings
522 (see the STDBINUTILS description for details).
524 Say N unless you know what you are doing.
528 config FORCE_MAX_ZONEORDER
529 int "Maximum zone order"
530 range 9 64 if PPC64 && PPC_64K_PAGES
531 default "9" if PPC64 && PPC_64K_PAGES
532 range 13 64 if PPC64 && !PPC_64K_PAGES
533 default "13" if PPC64 && !PPC_64K_PAGES
534 range 9 64 if PPC32 && PPC_16K_PAGES
535 default "9" if PPC32 && PPC_16K_PAGES
536 range 7 64 if PPC32 && PPC_64K_PAGES
537 default "7" if PPC32 && PPC_64K_PAGES
538 range 5 64 if PPC32 && PPC_256K_PAGES
539 default "5" if PPC32 && PPC_256K_PAGES
543 The kernel memory allocator divides physically contiguous memory
544 blocks into "zones", where each zone is a power of two number of
545 pages. This option selects the largest power of two that the kernel
546 keeps in the memory allocator. If you need to allocate very large
547 blocks of physically contiguous memory, then you may need to
550 This config option is actually maximum order plus one. For example,
551 a value of 11 means that the largest free memory block is 2^10 pages.
553 The page size is not necessarily 4KB. For example, on 64-bit
554 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
555 this in mind when choosing a value for this option.
557 config PPC_SUBPAGE_PROT
558 bool "Support setting protections for 4k subpages"
559 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
561 This option adds support for a system call to allow user programs
562 to set access permissions (read/write, readonly, or no access)
563 on the 4k subpages of each 64k page.
566 bool "SMT (Hyperthreading) scheduler support"
567 depends on PPC64 && SMP
569 SMT scheduler support improves the CPU scheduler's decision making
570 when dealing with POWER5 cpus at a cost of slightly increased
571 overhead in some places. If unsure say N here.
574 bool "Default bootloader kernel arguments"
577 string "Initial kernel command string"
578 depends on CMDLINE_BOOL
579 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
581 On some platforms, there is currently no way for the boot loader to
582 pass arguments to the kernel. For these platforms, you can supply
583 some command-line options at build time by entering them here. In
584 most cases you will need to specify the root device here.
587 string "Additional default image types"
589 List additional targets to be built by the bootwrapper here (separated
590 by spaces). This is useful for targets that depend of device tree
591 files in the .dts directory.
593 Targets in this list will be build as part of the default build
594 target, or when the user does a 'make zImage' or a
595 'make zImage.initrd'.
597 If unsure, leave blank
600 config ARCH_WANTS_FREEZER_CONTROL
604 source kernel/power/Kconfig
608 bool "Enable seccomp to safely compute untrusted bytecode"
612 This kernel feature is useful for number crunching applications
613 that may need to compute untrusted bytecode during their
614 execution. By using pipes or other transports made available to
615 the process as file descriptors supporting the read/write
616 syscalls, it's possible to isolate those applications in
617 their own address space using seccomp. Once seccomp is
618 enabled via /proc/<pid>/seccomp, it cannot be disabled
619 and the task is only allowed to execute a few safe syscalls
620 defined by each seccomp mode.
622 If unsure, say Y. Only embedded should say N here.
628 default !PPC_ISERIES || PCI
633 bool "Support for ISA-bus hardware"
634 depends on PPC_PREP || PPC_CHRP
637 Find out whether you have ISA slots on your motherboard. ISA is the
638 name of a bus system, i.e. the way the CPU talks to the other stuff
639 inside your box. If you have an Apple machine, say N here; if you
640 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
641 you have an embedded board, consult your board documentation.
647 config NEED_DMA_MAP_STATE
648 def_bool (PPC64 || NOT_COHERENT_CACHE)
650 config NEED_SG_DMA_LENGTH
653 config GENERIC_ISA_DMA
655 depends on ISA_DMA_API
658 config PPC_INDIRECT_PCI
661 default y if 40x || 44x
675 select PPC_INDIRECT_PCI
681 depends on SUSPEND && (PPC_85xx || PPC_86xx)
683 Freescale MPC85xx/MPC86xx power management controller support
684 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
692 Freescale Localbus support
696 depends on PPC_83xx || QUICC_ENGINE || CPM2
698 Freescale General-purpose Timers support
700 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
704 # Platforms that what PCI turned unconditionally just do select PCI
705 # in their config node. Platforms that want to choose at config
706 # time should select PPC_PCI_CHOICE
707 config PPC_PCI_CHOICE
711 bool "PCI support" if PPC_PCI_CHOICE
712 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
713 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
714 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
715 default PCI_QSPAN if !4xx && !CPM2 && 8xx
716 select ARCH_SUPPORTS_MSI
718 Find out whether your system includes a PCI bus. PCI is the name of
719 a bus system, i.e. the way the CPU talks to the other stuff inside
720 your box. If you say Y here, the kernel will include drivers and
721 infrastructure code to support PCI bus devices.
731 depends on !4xx && !CPM2 && 8xx
734 Say Y here if you have a system based on a Motorola 8xx-series
735 embedded processor with a QSPAN PCI interface, otherwise say N.
739 depends on PCI && 8260
740 select PPC_INDIRECT_PCI
744 bool "Enable workaround for MPC826x erratum PCI 9"
745 depends on PCI_8260 && !8272
749 prompt "IDMA channel for PCI 9 workaround"
752 config 8260_PCI9_IDMA1
755 config 8260_PCI9_IDMA2
758 config 8260_PCI9_IDMA3
761 config 8260_PCI9_IDMA4
766 source "drivers/pci/pcie/Kconfig"
768 source "drivers/pci/Kconfig"
770 source "drivers/pcmcia/Kconfig"
772 source "drivers/pci/hotplug/Kconfig"
779 bool "RapidIO support"
780 depends on HAS_RAPIDIO
782 If you say Y here, the kernel will include drivers and
783 infrastructure code to support RapidIO interconnect devices.
785 source "drivers/rapidio/Kconfig"
789 menu "Advanced setup"
792 config ADVANCED_OPTIONS
793 bool "Prompt for advanced kernel configuration options"
795 This option will enable prompting for a variety of advanced kernel
796 configuration options. These options can cause the kernel to not
797 work if they are set incorrectly, but can be used to optimize certain
798 aspects of kernel memory management.
800 Unless you know what you are doing, say N here.
802 comment "Default settings for advanced configuration options are used"
803 depends on !ADVANCED_OPTIONS
805 config LOWMEM_SIZE_BOOL
806 bool "Set maximum low memory"
807 depends on ADVANCED_OPTIONS
809 This option allows you to set the maximum amount of memory which
810 will be used as "low memory", that is, memory which the kernel can
811 access directly, without having to set up a kernel virtual mapping.
812 This can be useful in optimizing the layout of kernel virtual
815 Say N here unless you know what you are doing.
818 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
821 config LOWMEM_CAM_NUM_BOOL
822 bool "Set number of CAMs to use to map low memory"
823 depends on ADVANCED_OPTIONS && FSL_BOOKE
825 This option allows you to set the maximum number of CAM slots that
826 will be used to map low memory. There are a limited number of slots
827 available and even more limited number that will fit in the L1 MMU.
828 However, using more entries will allow mapping more low memory. This
829 can be useful in optimizing the layout of kernel virtual memory.
831 Say N here unless you know what you are doing.
833 config LOWMEM_CAM_NUM
835 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
839 bool "Build a relocatable kernel (EXPERIMENTAL)"
840 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
842 This builds a kernel image that is capable of running at the
843 location the kernel is loaded at (some alignment restrictions may
846 One use is for the kexec on panic case where the recovery kernel
847 must live at a different physical address than the primary
850 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
851 it has been loaded at and the compile time physical addresses
852 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
853 setting can still be useful to bootwrappers that need to know the
854 load location of the kernel (eg. u-boot/mkimage).
856 config PAGE_OFFSET_BOOL
857 bool "Set custom page offset address"
858 depends on ADVANCED_OPTIONS
860 This option allows you to set the kernel virtual address at which
861 the kernel will map low memory. This can be useful in optimizing
862 the virtual memory layout of the system.
864 Say N here unless you know what you are doing.
867 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
870 config KERNEL_START_BOOL
871 bool "Set custom kernel base address"
872 depends on ADVANCED_OPTIONS
874 This option allows you to set the kernel virtual address at which
875 the kernel will be loaded. Normally this should match PAGE_OFFSET
876 however there are times (like kdump) that one might not want them
879 Say N here unless you know what you are doing.
882 hex "Virtual address of kernel base" if KERNEL_START_BOOL
883 default PAGE_OFFSET if PAGE_OFFSET_BOOL
884 default "0xc2000000" if CRASH_DUMP && !RELOCATABLE
887 config PHYSICAL_START_BOOL
888 bool "Set physical address where the kernel is loaded"
889 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
891 This gives the physical address where the kernel is loaded.
893 Say N here unless you know what you are doing.
895 config PHYSICAL_START
896 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
897 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !RELOCATABLE
900 config PHYSICAL_ALIGN
902 default "0x04000000" if FSL_BOOKE
904 This value puts the alignment restrictions on physical address
905 where kernel is loaded and run from. Kernel is compiled for an
906 address which meets above alignment restriction.
908 config TASK_SIZE_BOOL
909 bool "Set custom user task size"
910 depends on ADVANCED_OPTIONS
912 This option allows you to set the amount of virtual address space
913 allocated to user tasks. This can be useful in optimizing the
914 virtual memory layout of the system.
916 Say N here unless you know what you are doing.
919 hex "Size of user task space" if TASK_SIZE_BOOL
920 default "0x80000000" if PPC_PREP || PPC_8xx
923 config CONSISTENT_SIZE_BOOL
924 bool "Set custom consistent memory pool size"
925 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
927 This option allows you to set the size of the
928 consistent memory pool. This pool of virtual memory
929 is used to make consistent memory allocations.
931 config CONSISTENT_SIZE
932 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
933 default "0x00200000" if NOT_COHERENT_CACHE
936 bool "Pinned Kernel TLBs (860 ONLY)"
937 depends on ADVANCED_OPTIONS && 8xx
942 bool "Build a relocatable kernel"
944 This builds a kernel image that is capable of running anywhere
945 in the RMA (real memory area) at any 16k-aligned base address.
946 The kernel is linked as a position-independent executable (PIE)
947 and contains dynamic relocations which are processed early
948 in the bootup process.
950 One use is for the kexec on panic case where the recovery kernel
951 must live at a different physical address than the primary
956 default "0xc000000000000000"
959 default "0xc000000000000000"
960 config PHYSICAL_START
967 source "drivers/Kconfig"
971 source "arch/powerpc/sysdev/qe_lib/Kconfig"
975 source "arch/powerpc/Kconfig.debug"
977 source "security/Kconfig"
981 depends on COMPAT && KEYS
984 source "crypto/Kconfig"
994 source "arch/powerpc/kvm/Kconfig"