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
142 select HAVE_PERF_EVENTS
143 select HAVE_REGS_AND_STACK_ACCESS_API
144 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
153 select COMPAT_BINFMT_ELF
155 config SYSVIPC_COMPAT
157 depends on COMPAT && SYSVIPC
160 # All PPC32s use generic nvram driver through ppc_md
165 config SCHED_OMIT_FRAME_POINTER
169 config ARCH_MAY_HAVE_PC_FDC
171 default !PPC_PSERIES || PCI
176 config PPC_UDBG_16550
180 config GENERIC_TBSYNC
182 default y if PPC32 && SMP
194 config SYS_SUPPORTS_APM_EMULATION
195 default y if PMAC_APM_EMU
198 config DEFAULT_UIMAGE
201 Used to allow a board to specify it wants a uImage built by default
207 config ARCH_HIBERNATION_POSSIBLE
211 config ARCH_SUSPEND_POSSIBLE
213 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
214 PPC_85xx || PPC_86xx || PPC_PSERIES
216 config PPC_DCR_NATIVE
226 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
229 config PPC_OF_PLATFORM_PCI
232 depends on PPC64 # not supported on 32 bits yet
235 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
238 config PPC_ADV_DEBUG_REGS
240 depends on 40x || BOOKE
243 config PPC_ADV_DEBUG_IACS
245 depends on PPC_ADV_DEBUG_REGS
249 config PPC_ADV_DEBUG_DACS
251 depends on PPC_ADV_DEBUG_REGS
254 config PPC_ADV_DEBUG_DVCS
256 depends on PPC_ADV_DEBUG_REGS
260 config PPC_ADV_DEBUG_DAC_RANGE
262 depends on PPC_ADV_DEBUG_REGS && 44x
265 source "init/Kconfig"
267 source "kernel/Kconfig.freezer"
269 source "arch/powerpc/sysdev/Kconfig"
270 source "arch/powerpc/platforms/Kconfig"
272 menu "Kernel options"
275 bool "High memory support"
278 source kernel/time/Kconfig
279 source kernel/Kconfig.hz
280 source kernel/Kconfig.preempt
281 source "fs/Kconfig.binfmt"
283 config HUGETLB_PAGE_SIZE_VARIABLE
285 depends on HUGETLB_PAGE
288 config MATH_EMULATION
289 bool "Math emulation"
290 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
292 Some PowerPC chips designed for embedded applications do not have
293 a floating-point unit and therefore do not implement the
294 floating-point instructions in the PowerPC instruction set. If you
295 say Y here, the kernel will include code to emulate a floating-point
296 unit, which will allow programs that use floating-point
299 config 8XX_MINIMAL_FPEMU
300 bool "Minimal math emulation for 8xx"
301 depends on 8xx && !MATH_EMULATION
303 Older arch/ppc kernels still emulated a few floating point
304 instructions such as load and store, even when full math
305 emulation is disabled. Say "Y" here if you want to preserve
308 It is recommended that you build a soft-float userspace instead.
314 bool "SWIOTLB support"
318 Support for IO bounce buffering for systems without an IOMMU.
319 This allows us to DMA to the full physical address space on
320 platforms where the size of a physical address is larger
321 than the bus address. Not all platforms support this.
324 bool "Support for enabling/disabling CPUs"
325 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
327 Say Y here to be able to disable and re-enable individual
328 CPUs at runtime on SMP machines.
330 Say N if you are unsure.
332 config ARCH_CPU_PROBE_RELEASE
334 depends on HOTPLUG_CPU
336 config ARCH_ENABLE_MEMORY_HOTPLUG
339 config ARCH_HAS_WALK_MEMORY
342 config ARCH_ENABLE_MEMORY_HOTREMOVE
346 bool "kexec system call (EXPERIMENTAL)"
347 depends on (PPC_BOOK3S || FSL_BOOKE) && EXPERIMENTAL
349 kexec is a system call that implements the ability to shutdown your
350 current kernel, and to start another kernel. It is like a reboot
351 but it is independent of the system firmware. And like a reboot
352 you can start any kernel with it, not just Linux.
354 The name comes from the similarity to the exec system call.
356 It is an ongoing process to be certain the hardware in a machine
357 is properly shutdown, so do not be surprised if this code does not
358 initially work for you. It may help to enable device hotplugging
359 support. As of this writing the exact hardware interface is
360 strongly in flux, so no good recommendation can be made.
363 bool "Build a kdump crash kernel"
364 depends on PPC64 || 6xx || FSL_BOOKE
365 select RELOCATABLE if PPC64 || FSL_BOOKE
367 Build a kernel suitable for use as a kdump capture kernel.
368 The same kernel binary can be used as production kernel and dump
372 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
373 depends on PPC_PSERIES && EXPERIMENTAL
375 Hypervisor-assisted dump is meant to be a kdump replacement
376 offering robustness and speed not possible without system
377 hypervisor assistance.
382 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
383 default y if PPC_PREP
386 bool "Distribute interrupts on all CPUs by default"
387 depends on SMP && !MV64360
389 This option gives the kernel permission to distribute IRQs across
390 multiple CPUs. Saying N here will route all IRQs to the first
391 CPU. Generally saying Y is safe, although some problems have been
392 reported with SMP Power Macintoshes with this option enabled.
395 bool "Support sparse irq numbering"
398 This enables support for sparse irqs. This is useful for distro
399 kernels that want to define a high CONFIG_NR_CPUS value but still
400 want to have low kernel memory footprint on smaller machines.
402 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
403 out the irq_desc[] array in a more NUMA-friendly way. )
405 If you don't know what to do here, say N.
410 default y if SMP && PPC_PSERIES
416 depends on NEED_MULTIPLE_NODES
418 config MAX_ACTIVE_REGIONS
420 default "256" if PPC64
423 config ARCH_SELECT_MEMORY_MODEL
427 config ARCH_FLATMEM_ENABLE
429 depends on (PPC64 && !NUMA) || PPC32
431 config ARCH_SPARSEMEM_ENABLE
434 select SPARSEMEM_VMEMMAP_ENABLE
436 config ARCH_SPARSEMEM_DEFAULT
438 depends on (SMP && PPC_PSERIES) || PPC_PS3
440 config ARCH_POPULATES_NODE_MAP
443 config SYS_SUPPORTS_HUGETLBFS
445 depends on PPC_BOOK3S_64
449 config ARCH_MEMORY_PROBE
451 depends on MEMORY_HOTPLUG
453 # Some NUMA nodes have memory ranges that span
454 # other nodes. Even though a pfn is valid and
455 # between a node's start and end pfns, it may not
456 # reside on that node. See memmap_init_zone()
458 config NODES_SPAN_OTHER_NODES
460 depends on NEED_MULTIPLE_NODES
462 config PPC_HAS_HASH_64K
468 bool "Using standard binutils settings"
472 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
473 Note, that kernel will be able to run only those applications,
474 which had been compiled using binutils later than 2.17.50.0.3 with
475 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
476 the older binutils, you can patch them with a trivial patch, which
477 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
483 Select the kernel logical page size. Increasing the page size
484 will reduce software overhead at each page boundary, allow
485 hardware prefetch mechanisms to be more effective, and allow
486 larger dma transfers increasing IO efficiency and reducing
487 overhead. However the utilization of memory will increase.
488 For example, each cached file will using a multiple of the
489 page size to hold its contents and the difference between the
490 end of file and the end of page is wasted.
492 Some dedicated systems, such as software raid serving with
493 accelerated calculations, have shown significant increases.
495 If you configure a 64 bit kernel for 64k pages but the
496 processor does not support them, then the kernel will simulate
497 them with 4k pages, loading them on demand, but with the
498 reduced software overhead and larger internal fragmentation.
499 For the 32 bit kernel, a large page option will not be offered
500 unless it is supported by the configured processor.
502 If unsure, choose 4K_PAGES.
508 bool "16k page size" if 44x
511 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
512 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
514 config PPC_256K_PAGES
515 bool "256k page size" if 44x
516 depends on !STDBINUTILS
518 Make the page size 256k.
520 As the ELF standard only requires alignment to support page
521 sizes up to 64k, you will need to compile all of your user
522 space applications with a non-standard binutils settings
523 (see the STDBINUTILS description for details).
525 Say N unless you know what you are doing.
529 config FORCE_MAX_ZONEORDER
530 int "Maximum zone order"
531 range 9 64 if PPC64 && PPC_64K_PAGES
532 default "9" if PPC64 && PPC_64K_PAGES
533 range 13 64 if PPC64 && !PPC_64K_PAGES
534 default "13" if PPC64 && !PPC_64K_PAGES
535 range 9 64 if PPC32 && PPC_16K_PAGES
536 default "9" if PPC32 && PPC_16K_PAGES
537 range 7 64 if PPC32 && PPC_64K_PAGES
538 default "7" if PPC32 && PPC_64K_PAGES
539 range 5 64 if PPC32 && PPC_256K_PAGES
540 default "5" if PPC32 && PPC_256K_PAGES
544 The kernel memory allocator divides physically contiguous memory
545 blocks into "zones", where each zone is a power of two number of
546 pages. This option selects the largest power of two that the kernel
547 keeps in the memory allocator. If you need to allocate very large
548 blocks of physically contiguous memory, then you may need to
551 This config option is actually maximum order plus one. For example,
552 a value of 11 means that the largest free memory block is 2^10 pages.
554 The page size is not necessarily 4KB. For example, on 64-bit
555 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
556 this in mind when choosing a value for this option.
558 config PPC_SUBPAGE_PROT
559 bool "Support setting protections for 4k subpages"
560 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
562 This option adds support for a system call to allow user programs
563 to set access permissions (read/write, readonly, or no access)
564 on the 4k subpages of each 64k page.
567 bool "SMT (Hyperthreading) scheduler support"
568 depends on PPC64 && SMP
570 SMT scheduler support improves the CPU scheduler's decision making
571 when dealing with POWER5 cpus at a cost of slightly increased
572 overhead in some places. If unsure say N 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 NEED_DMA_MAP_STATE
649 def_bool (PPC64 || NOT_COHERENT_CACHE)
651 config NEED_SG_DMA_LENGTH
654 config GENERIC_ISA_DMA
656 depends on ISA_DMA_API
659 config PPC_INDIRECT_PCI
662 default y if 40x || 44x
676 select PPC_INDIRECT_PCI
682 depends on SUSPEND && (PPC_85xx || PPC_86xx)
684 Freescale MPC85xx/MPC86xx power management controller support
685 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
693 Freescale Localbus support
697 depends on PPC_83xx || QUICC_ENGINE || CPM2
699 Freescale General-purpose Timers support
701 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
705 # Platforms that what PCI turned unconditionally just do select PCI
706 # in their config node. Platforms that want to choose at config
707 # time should select PPC_PCI_CHOICE
708 config PPC_PCI_CHOICE
712 bool "PCI support" if PPC_PCI_CHOICE
713 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
714 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
715 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
716 default PCI_QSPAN if !4xx && !CPM2 && 8xx
717 select ARCH_SUPPORTS_MSI
719 Find out whether your system includes a PCI bus. PCI is the name of
720 a bus system, i.e. the way the CPU talks to the other stuff inside
721 your box. If you say Y here, the kernel will include drivers and
722 infrastructure code to support PCI bus devices.
732 depends on !4xx && !CPM2 && 8xx
735 Say Y here if you have a system based on a Motorola 8xx-series
736 embedded processor with a QSPAN PCI interface, otherwise say N.
740 depends on PCI && 8260
741 select PPC_INDIRECT_PCI
745 bool "Enable workaround for MPC826x erratum PCI 9"
746 depends on PCI_8260 && !8272
750 prompt "IDMA channel for PCI 9 workaround"
753 config 8260_PCI9_IDMA1
756 config 8260_PCI9_IDMA2
759 config 8260_PCI9_IDMA3
762 config 8260_PCI9_IDMA4
767 source "drivers/pci/pcie/Kconfig"
769 source "drivers/pci/Kconfig"
771 source "drivers/pcmcia/Kconfig"
773 source "drivers/pci/hotplug/Kconfig"
780 bool "RapidIO support"
781 depends on HAS_RAPIDIO
783 If you say Y here, the kernel will include drivers and
784 infrastructure code to support RapidIO interconnect devices.
786 source "drivers/rapidio/Kconfig"
790 menu "Advanced setup"
793 config ADVANCED_OPTIONS
794 bool "Prompt for advanced kernel configuration options"
796 This option will enable prompting for a variety of advanced kernel
797 configuration options. These options can cause the kernel to not
798 work if they are set incorrectly, but can be used to optimize certain
799 aspects of kernel memory management.
801 Unless you know what you are doing, say N here.
803 comment "Default settings for advanced configuration options are used"
804 depends on !ADVANCED_OPTIONS
806 config LOWMEM_SIZE_BOOL
807 bool "Set maximum low memory"
808 depends on ADVANCED_OPTIONS
810 This option allows you to set the maximum amount of memory which
811 will be used as "low memory", that is, memory which the kernel can
812 access directly, without having to set up a kernel virtual mapping.
813 This can be useful in optimizing the layout of kernel virtual
816 Say N here unless you know what you are doing.
819 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
822 config LOWMEM_CAM_NUM_BOOL
823 bool "Set number of CAMs to use to map low memory"
824 depends on ADVANCED_OPTIONS && FSL_BOOKE
826 This option allows you to set the maximum number of CAM slots that
827 will be used to map low memory. There are a limited number of slots
828 available and even more limited number that will fit in the L1 MMU.
829 However, using more entries will allow mapping more low memory. This
830 can be useful in optimizing the layout of kernel virtual memory.
832 Say N here unless you know what you are doing.
834 config LOWMEM_CAM_NUM
836 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
840 bool "Build a relocatable kernel (EXPERIMENTAL)"
841 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
843 This builds a kernel image that is capable of running at the
844 location the kernel is loaded at (some alignment restrictions may
847 One use is for the kexec on panic case where the recovery kernel
848 must live at a different physical address than the primary
851 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
852 it has been loaded at and the compile time physical addresses
853 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
854 setting can still be useful to bootwrappers that need to know the
855 load location of the kernel (eg. u-boot/mkimage).
857 config PAGE_OFFSET_BOOL
858 bool "Set custom page offset address"
859 depends on ADVANCED_OPTIONS
861 This option allows you to set the kernel virtual address at which
862 the kernel will map low memory. This can be useful in optimizing
863 the virtual memory layout of the system.
865 Say N here unless you know what you are doing.
868 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
871 config KERNEL_START_BOOL
872 bool "Set custom kernel base address"
873 depends on ADVANCED_OPTIONS
875 This option allows you to set the kernel virtual address at which
876 the kernel will be loaded. Normally this should match PAGE_OFFSET
877 however there are times (like kdump) that one might not want them
880 Say N here unless you know what you are doing.
883 hex "Virtual address of kernel base" if KERNEL_START_BOOL
884 default PAGE_OFFSET if PAGE_OFFSET_BOOL
885 default "0xc2000000" if CRASH_DUMP && !RELOCATABLE
888 config PHYSICAL_START_BOOL
889 bool "Set physical address where the kernel is loaded"
890 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
892 This gives the physical address where the kernel is loaded.
894 Say N here unless you know what you are doing.
896 config PHYSICAL_START
897 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
898 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !RELOCATABLE
901 config PHYSICAL_ALIGN
903 default "0x04000000" if FSL_BOOKE
905 This value puts the alignment restrictions on physical address
906 where kernel is loaded and run from. Kernel is compiled for an
907 address which meets above alignment restriction.
909 config TASK_SIZE_BOOL
910 bool "Set custom user task size"
911 depends on ADVANCED_OPTIONS
913 This option allows you to set the amount of virtual address space
914 allocated to user tasks. This can be useful in optimizing the
915 virtual memory layout of the system.
917 Say N here unless you know what you are doing.
920 hex "Size of user task space" if TASK_SIZE_BOOL
921 default "0x80000000" if PPC_PREP || PPC_8xx
924 config CONSISTENT_SIZE_BOOL
925 bool "Set custom consistent memory pool size"
926 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
928 This option allows you to set the size of the
929 consistent memory pool. This pool of virtual memory
930 is used to make consistent memory allocations.
932 config CONSISTENT_SIZE
933 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
934 default "0x00200000" if NOT_COHERENT_CACHE
937 bool "Pinned Kernel TLBs (860 ONLY)"
938 depends on ADVANCED_OPTIONS && 8xx
943 bool "Build a relocatable kernel"
945 This builds a kernel image that is capable of running anywhere
946 in the RMA (real memory area) at any 16k-aligned base address.
947 The kernel is linked as a position-independent executable (PIE)
948 and contains dynamic relocations which are processed early
949 in the bootup process.
951 One use is for the kexec on panic case where the recovery kernel
952 must live at a different physical address than the primary
957 default "0xc000000000000000"
960 default "0xc000000000000000"
961 config PHYSICAL_START
968 source "drivers/Kconfig"
972 source "arch/powerpc/sysdev/qe_lib/Kconfig"
976 source "arch/powerpc/Kconfig.debug"
978 source "security/Kconfig"
982 depends on COMPAT && KEYS
985 source "crypto/Kconfig"
995 source "arch/powerpc/kvm/Kconfig"