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 config PPC_ADV_DEBUG_REGS
246 depends on 40x || BOOKE
249 config PPC_ADV_DEBUG_IACS
251 depends on PPC_ADV_DEBUG_REGS
255 config PPC_ADV_DEBUG_DACS
257 depends on PPC_ADV_DEBUG_REGS
260 config PPC_ADV_DEBUG_DVCS
262 depends on PPC_ADV_DEBUG_REGS
266 config PPC_ADV_DEBUG_DAC_RANGE
268 depends on PPC_ADV_DEBUG_REGS && 44x
271 source "init/Kconfig"
273 source "kernel/Kconfig.freezer"
275 source "arch/powerpc/sysdev/Kconfig"
276 source "arch/powerpc/platforms/Kconfig"
278 menu "Kernel options"
281 bool "High memory support"
284 source kernel/time/Kconfig
285 source kernel/Kconfig.hz
286 source kernel/Kconfig.preempt
287 source "fs/Kconfig.binfmt"
289 config HUGETLB_PAGE_SIZE_VARIABLE
291 depends on HUGETLB_PAGE
294 config MATH_EMULATION
295 bool "Math emulation"
296 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
298 Some PowerPC chips designed for embedded applications do not have
299 a floating-point unit and therefore do not implement the
300 floating-point instructions in the PowerPC instruction set. If you
301 say Y here, the kernel will include code to emulate a floating-point
302 unit, which will allow programs that use floating-point
305 config 8XX_MINIMAL_FPEMU
306 bool "Minimal math emulation for 8xx"
307 depends on 8xx && !MATH_EMULATION
309 Older arch/ppc kernels still emulated a few floating point
310 instructions such as load and store, even when full math
311 emulation is disabled. Say "Y" here if you want to preserve
314 It is recommended that you build a soft-float userspace instead.
317 bool "Enable IOMMU virtual merging"
321 Cause IO segments sent to a device for DMA to be merged virtually
322 by the IOMMU when they happen to have been allocated contiguously.
323 This doesn't add pressure to the IOMMU allocator. However, some
324 drivers don't support getting large merged segments coming back
327 Most drivers don't have this problem; it is safe to say Y here.
333 bool "SWIOTLB support"
337 Support for IO bounce buffering for systems without an IOMMU.
338 This allows us to DMA to the full physical address space on
339 platforms where the size of a physical address is larger
340 than the bus address. Not all platforms support this.
343 bool "Support for enabling/disabling CPUs"
344 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
346 Say Y here to be able to disable and re-enable individual
347 CPUs at runtime on SMP machines.
349 Say N if you are unsure.
351 config ARCH_CPU_PROBE_RELEASE
353 depends on HOTPLUG_CPU
355 config ARCH_ENABLE_MEMORY_HOTPLUG
358 config ARCH_HAS_WALK_MEMORY
361 config ARCH_ENABLE_MEMORY_HOTREMOVE
365 bool "kexec system call (EXPERIMENTAL)"
366 depends on PPC_BOOK3S && EXPERIMENTAL
368 kexec is a system call that implements the ability to shutdown your
369 current kernel, and to start another kernel. It is like a reboot
370 but it is independent of the system firmware. And like a reboot
371 you can start any kernel with it, not just Linux.
373 The name comes from the similarity to the exec system call.
375 It is an ongoing process to be certain the hardware in a machine
376 is properly shutdown, so do not be surprised if this code does not
377 initially work for you. It may help to enable device hotplugging
378 support. As of this writing the exact hardware interface is
379 strongly in flux, so no good recommendation can be made.
382 bool "Build a kdump crash kernel"
383 depends on PPC64 || 6xx
384 select RELOCATABLE if PPC64
386 Build a kernel suitable for use as a kdump capture kernel.
387 The same kernel binary can be used as production kernel and dump
391 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
392 depends on PPC_PSERIES && EXPERIMENTAL
394 Hypervisor-assisted dump is meant to be a kdump replacement
395 offering robustness and speed not possible without system
396 hypervisor assistance.
401 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
402 default y if PPC_PREP
405 bool "Distribute interrupts on all CPUs by default"
406 depends on SMP && !MV64360
408 This option gives the kernel permission to distribute IRQs across
409 multiple CPUs. Saying N here will route all IRQs to the first
410 CPU. Generally saying Y is safe, although some problems have been
411 reported with SMP Power Macintoshes with this option enabled.
414 bool "Support sparse irq numbering"
417 This enables support for sparse irqs. This is useful for distro
418 kernels that want to define a high CONFIG_NR_CPUS value but still
419 want to have low kernel memory footprint on smaller machines.
421 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
422 out the irq_desc[] array in a more NUMA-friendly way. )
424 If you don't know what to do here, say Y.
429 default y if SMP && PPC_PSERIES
435 depends on NEED_MULTIPLE_NODES
437 config MAX_ACTIVE_REGIONS
439 default "256" if PPC64
442 config ARCH_SELECT_MEMORY_MODEL
446 config ARCH_FLATMEM_ENABLE
448 depends on (PPC64 && !NUMA) || PPC32
450 config ARCH_SPARSEMEM_ENABLE
453 select SPARSEMEM_VMEMMAP_ENABLE
455 config ARCH_SPARSEMEM_DEFAULT
457 depends on (SMP && PPC_PSERIES) || PPC_PS3
459 config ARCH_POPULATES_NODE_MAP
462 config SYS_SUPPORTS_HUGETLBFS
464 depends on PPC_BOOK3S_64
468 config ARCH_MEMORY_PROBE
470 depends on MEMORY_HOTPLUG
472 # Some NUMA nodes have memory ranges that span
473 # other nodes. Even though a pfn is valid and
474 # between a node's start and end pfns, it may not
475 # reside on that node. See memmap_init_zone()
477 config NODES_SPAN_OTHER_NODES
479 depends on NEED_MULTIPLE_NODES
481 config PPC_HAS_HASH_64K
487 bool "Using standard binutils settings"
491 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
492 Note, that kernel will be able to run only those applications,
493 which had been compiled using binutils later than 2.17.50.0.3 with
494 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
495 the older binutils, you can patch them with a trivial patch, which
496 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
502 Select the kernel logical page size. Increasing the page size
503 will reduce software overhead at each page boundary, allow
504 hardware prefetch mechanisms to be more effective, and allow
505 larger dma transfers increasing IO efficiency and reducing
506 overhead. However the utilization of memory will increase.
507 For example, each cached file will using a multiple of the
508 page size to hold its contents and the difference between the
509 end of file and the end of page is wasted.
511 Some dedicated systems, such as software raid serving with
512 accelerated calculations, have shown significant increases.
514 If you configure a 64 bit kernel for 64k pages but the
515 processor does not support them, then the kernel will simulate
516 them with 4k pages, loading them on demand, but with the
517 reduced software overhead and larger internal fragmentation.
518 For the 32 bit kernel, a large page option will not be offered
519 unless it is supported by the configured processor.
521 If unsure, choose 4K_PAGES.
527 bool "16k page size" if 44x
530 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
531 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
533 config PPC_256K_PAGES
534 bool "256k page size" if 44x
535 depends on !STDBINUTILS
537 Make the page size 256k.
539 As the ELF standard only requires alignment to support page
540 sizes up to 64k, you will need to compile all of your user
541 space applications with a non-standard binutils settings
542 (see the STDBINUTILS description for details).
544 Say N unless you know what you are doing.
548 config FORCE_MAX_ZONEORDER
549 int "Maximum zone order"
550 range 9 64 if PPC64 && PPC_64K_PAGES
551 default "9" if PPC64 && PPC_64K_PAGES
552 range 13 64 if PPC64 && !PPC_64K_PAGES
553 default "13" if PPC64 && !PPC_64K_PAGES
554 range 9 64 if PPC32 && PPC_16K_PAGES
555 default "9" if PPC32 && PPC_16K_PAGES
556 range 7 64 if PPC32 && PPC_64K_PAGES
557 default "7" if PPC32 && PPC_64K_PAGES
558 range 5 64 if PPC32 && PPC_256K_PAGES
559 default "5" if PPC32 && PPC_256K_PAGES
563 The kernel memory allocator divides physically contiguous memory
564 blocks into "zones", where each zone is a power of two number of
565 pages. This option selects the largest power of two that the kernel
566 keeps in the memory allocator. If you need to allocate very large
567 blocks of physically contiguous memory, then you may need to
570 This config option is actually maximum order plus one. For example,
571 a value of 11 means that the largest free memory block is 2^10 pages.
573 The page size is not necessarily 4KB. For example, on 64-bit
574 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
575 this in mind when choosing a value for this option.
577 config PPC_SUBPAGE_PROT
578 bool "Support setting protections for 4k subpages"
579 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
581 This option adds support for a system call to allow user programs
582 to set access permissions (read/write, readonly, or no access)
583 on the 4k subpages of each 64k page.
586 bool "SMT (Hyperthreading) scheduler support"
587 depends on PPC64 && SMP
589 SMT scheduler support improves the CPU scheduler's decision making
590 when dealing with POWER5 cpus at a cost of slightly increased
591 overhead in some places. If unsure say N here.
593 config PROC_DEVICETREE
594 bool "Support for device tree in /proc"
597 This option adds a device-tree directory under /proc which contains
598 an image of the device tree that the kernel copies from Open
599 Firmware or other boot firmware. If unsure, say Y here.
602 bool "Default bootloader kernel arguments"
605 string "Initial kernel command string"
606 depends on CMDLINE_BOOL
607 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
609 On some platforms, there is currently no way for the boot loader to
610 pass arguments to the kernel. For these platforms, you can supply
611 some command-line options at build time by entering them here. In
612 most cases you will need to specify the root device here.
615 string "Additional default image types"
617 List additional targets to be built by the bootwrapper here (separated
618 by spaces). This is useful for targets that depend of device tree
619 files in the .dts directory.
621 Targets in this list will be build as part of the default build
622 target, or when the user does a 'make zImage' or a
623 'make zImage.initrd'.
625 If unsure, leave blank
628 config ARCH_WANTS_FREEZER_CONTROL
632 source kernel/power/Kconfig
636 bool "Enable seccomp to safely compute untrusted bytecode"
640 This kernel feature is useful for number crunching applications
641 that may need to compute untrusted bytecode during their
642 execution. By using pipes or other transports made available to
643 the process as file descriptors supporting the read/write
644 syscalls, it's possible to isolate those applications in
645 their own address space using seccomp. Once seccomp is
646 enabled via /proc/<pid>/seccomp, it cannot be disabled
647 and the task is only allowed to execute a few safe syscalls
648 defined by each seccomp mode.
650 If unsure, say Y. Only embedded should say N here.
656 default !PPC_ISERIES || PCI
661 bool "Support for ISA-bus hardware"
662 depends on PPC_PREP || PPC_CHRP
665 Find out whether you have ISA slots on your motherboard. ISA is the
666 name of a bus system, i.e. the way the CPU talks to the other stuff
667 inside your box. If you have an Apple machine, say N here; if you
668 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
669 you have an embedded board, consult your board documentation.
675 config NEED_DMA_MAP_STATE
676 def_bool (PPC64 || NOT_COHERENT_CACHE)
678 config GENERIC_ISA_DMA
680 depends on PPC64 || POWER4 || 6xx && !CPM2
683 config PPC_INDIRECT_PCI
686 default y if 40x || 44x
700 select PPC_INDIRECT_PCI
706 depends on SUSPEND && (PPC_85xx || PPC_86xx)
708 Freescale MPC85xx/MPC86xx power management controller support
709 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
717 Freescale Localbus support
721 depends on PPC_83xx || QUICC_ENGINE || CPM2
723 Freescale General-purpose Timers support
725 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
729 # Platforms that what PCI turned unconditionally just do select PCI
730 # in their config node. Platforms that want to choose at config
731 # time should select PPC_PCI_CHOICE
732 config PPC_PCI_CHOICE
736 bool "PCI support" if PPC_PCI_CHOICE
737 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
738 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
739 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
740 default PCI_QSPAN if !4xx && !CPM2 && 8xx
741 select ARCH_SUPPORTS_MSI
743 Find out whether your system includes a PCI bus. PCI is the name of
744 a bus system, i.e. the way the CPU talks to the other stuff inside
745 your box. If you say Y here, the kernel will include drivers and
746 infrastructure code to support PCI bus devices.
756 depends on !4xx && !CPM2 && 8xx
759 Say Y here if you have a system based on a Motorola 8xx-series
760 embedded processor with a QSPAN PCI interface, otherwise say N.
764 depends on PCI && 8260
765 select PPC_INDIRECT_PCI
769 bool "Enable workaround for MPC826x erratum PCI 9"
770 depends on PCI_8260 && !8272
774 prompt "IDMA channel for PCI 9 workaround"
777 config 8260_PCI9_IDMA1
780 config 8260_PCI9_IDMA2
783 config 8260_PCI9_IDMA3
786 config 8260_PCI9_IDMA4
791 source "drivers/pci/pcie/Kconfig"
793 source "drivers/pci/Kconfig"
795 source "drivers/pcmcia/Kconfig"
797 source "drivers/pci/hotplug/Kconfig"
804 bool "RapidIO support"
805 depends on HAS_RAPIDIO
807 If you say Y here, the kernel will include drivers and
808 infrastructure code to support RapidIO interconnect devices.
810 source "drivers/rapidio/Kconfig"
814 menu "Advanced setup"
817 config ADVANCED_OPTIONS
818 bool "Prompt for advanced kernel configuration options"
820 This option will enable prompting for a variety of advanced kernel
821 configuration options. These options can cause the kernel to not
822 work if they are set incorrectly, but can be used to optimize certain
823 aspects of kernel memory management.
825 Unless you know what you are doing, say N here.
827 comment "Default settings for advanced configuration options are used"
828 depends on !ADVANCED_OPTIONS
830 config LOWMEM_SIZE_BOOL
831 bool "Set maximum low memory"
832 depends on ADVANCED_OPTIONS
834 This option allows you to set the maximum amount of memory which
835 will be used as "low memory", that is, memory which the kernel can
836 access directly, without having to set up a kernel virtual mapping.
837 This can be useful in optimizing the layout of kernel virtual
840 Say N here unless you know what you are doing.
843 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
846 config LOWMEM_CAM_NUM_BOOL
847 bool "Set number of CAMs to use to map low memory"
848 depends on ADVANCED_OPTIONS && FSL_BOOKE
850 This option allows you to set the maximum number of CAM slots that
851 will be used to map low memory. There are a limited number of slots
852 available and even more limited number that will fit in the L1 MMU.
853 However, using more entries will allow mapping more low memory. This
854 can be useful in optimizing the layout of kernel virtual memory.
856 Say N here unless you know what you are doing.
858 config LOWMEM_CAM_NUM
860 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
864 bool "Build a relocatable kernel (EXPERIMENTAL)"
865 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
867 This builds a kernel image that is capable of running at the
868 location the kernel is loaded at (some alignment restrictions may
871 One use is for the kexec on panic case where the recovery kernel
872 must live at a different physical address than the primary
875 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
876 it has been loaded at and the compile time physical addresses
877 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
878 setting can still be useful to bootwrappers that need to know the
879 load location of the kernel (eg. u-boot/mkimage).
881 config PAGE_OFFSET_BOOL
882 bool "Set custom page offset address"
883 depends on ADVANCED_OPTIONS
885 This option allows you to set the kernel virtual address at which
886 the kernel will map low memory. This can be useful in optimizing
887 the virtual memory layout of the system.
889 Say N here unless you know what you are doing.
892 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
895 config KERNEL_START_BOOL
896 bool "Set custom kernel base address"
897 depends on ADVANCED_OPTIONS
899 This option allows you to set the kernel virtual address at which
900 the kernel will be loaded. Normally this should match PAGE_OFFSET
901 however there are times (like kdump) that one might not want them
904 Say N here unless you know what you are doing.
907 hex "Virtual address of kernel base" if KERNEL_START_BOOL
908 default PAGE_OFFSET if PAGE_OFFSET_BOOL
909 default "0xc2000000" if CRASH_DUMP
912 config PHYSICAL_START_BOOL
913 bool "Set physical address where the kernel is loaded"
914 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
916 This gives the physical address where the kernel is loaded.
918 Say N here unless you know what you are doing.
920 config PHYSICAL_START
921 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
922 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
925 config PHYSICAL_ALIGN
927 default "0x04000000" if FSL_BOOKE
929 This value puts the alignment restrictions on physical address
930 where kernel is loaded and run from. Kernel is compiled for an
931 address which meets above alignment restriction.
933 config TASK_SIZE_BOOL
934 bool "Set custom user task size"
935 depends on ADVANCED_OPTIONS
937 This option allows you to set the amount of virtual address space
938 allocated to user tasks. This can be useful in optimizing the
939 virtual memory layout of the system.
941 Say N here unless you know what you are doing.
944 hex "Size of user task space" if TASK_SIZE_BOOL
945 default "0x80000000" if PPC_PREP || PPC_8xx
948 config CONSISTENT_SIZE_BOOL
949 bool "Set custom consistent memory pool size"
950 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
952 This option allows you to set the size of the
953 consistent memory pool. This pool of virtual memory
954 is used to make consistent memory allocations.
956 config CONSISTENT_SIZE
957 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
958 default "0x00200000" if NOT_COHERENT_CACHE
961 bool "Pinned Kernel TLBs (860 ONLY)"
962 depends on ADVANCED_OPTIONS && 8xx
967 bool "Build a relocatable kernel"
969 This builds a kernel image that is capable of running anywhere
970 in the RMA (real memory area) at any 16k-aligned base address.
971 The kernel is linked as a position-independent executable (PIE)
972 and contains dynamic relocations which are processed early
973 in the bootup process.
975 One use is for the kexec on panic case where the recovery kernel
976 must live at a different physical address than the primary
981 default "0xc000000000000000"
984 default "0xc000000000000000"
985 config PHYSICAL_START
992 source "drivers/Kconfig"
996 source "arch/powerpc/sysdev/qe_lib/Kconfig"
1000 source "arch/powerpc/Kconfig.debug"
1002 source "security/Kconfig"
1006 depends on COMPAT && KEYS
1009 source "crypto/Kconfig"
1016 config PPC_LIB_RHEAP
1019 source "arch/powerpc/kvm/Kconfig"