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
180 config PPC_UDBG_16550
184 config GENERIC_TBSYNC
186 default y if PPC32 && SMP
198 config SYS_SUPPORTS_APM_EMULATION
199 default y if PMAC_APM_EMU
206 config DEFAULT_UIMAGE
209 Used to allow a board to specify it wants a uImage built by default
215 config ARCH_HIBERNATION_POSSIBLE
219 config ARCH_SUSPEND_POSSIBLE
221 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
224 config PPC_DCR_NATIVE
234 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
237 config PPC_OF_PLATFORM_PCI
240 depends on PPC64 # not supported on 32 bits yet
243 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
246 config PPC_ADV_DEBUG_REGS
248 depends on 40x || BOOKE
251 config PPC_ADV_DEBUG_IACS
253 depends on PPC_ADV_DEBUG_REGS
257 config PPC_ADV_DEBUG_DACS
259 depends on PPC_ADV_DEBUG_REGS
262 config PPC_ADV_DEBUG_DVCS
264 depends on PPC_ADV_DEBUG_REGS
268 config PPC_ADV_DEBUG_DAC_RANGE
270 depends on PPC_ADV_DEBUG_REGS && 44x
273 source "init/Kconfig"
275 source "kernel/Kconfig.freezer"
277 source "arch/powerpc/sysdev/Kconfig"
278 source "arch/powerpc/platforms/Kconfig"
280 menu "Kernel options"
283 bool "High memory support"
286 source kernel/time/Kconfig
287 source kernel/Kconfig.hz
288 source kernel/Kconfig.preempt
289 source "fs/Kconfig.binfmt"
291 config HUGETLB_PAGE_SIZE_VARIABLE
293 depends on HUGETLB_PAGE
296 config MATH_EMULATION
297 bool "Math emulation"
298 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
300 Some PowerPC chips designed for embedded applications do not have
301 a floating-point unit and therefore do not implement the
302 floating-point instructions in the PowerPC instruction set. If you
303 say Y here, the kernel will include code to emulate a floating-point
304 unit, which will allow programs that use floating-point
307 config 8XX_MINIMAL_FPEMU
308 bool "Minimal math emulation for 8xx"
309 depends on 8xx && !MATH_EMULATION
311 Older arch/ppc kernels still emulated a few floating point
312 instructions such as load and store, even when full math
313 emulation is disabled. Say "Y" here if you want to preserve
316 It is recommended that you build a soft-float userspace instead.
322 bool "SWIOTLB support"
326 Support for IO bounce buffering for systems without an IOMMU.
327 This allows us to DMA to the full physical address space on
328 platforms where the size of a physical address is larger
329 than the bus address. Not all platforms support this.
332 bool "Support for enabling/disabling CPUs"
333 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
335 Say Y here to be able to disable and re-enable individual
336 CPUs at runtime on SMP machines.
338 Say N if you are unsure.
340 config ARCH_CPU_PROBE_RELEASE
342 depends on HOTPLUG_CPU
344 config ARCH_ENABLE_MEMORY_HOTPLUG
347 config ARCH_HAS_WALK_MEMORY
350 config ARCH_ENABLE_MEMORY_HOTREMOVE
354 bool "kexec system call (EXPERIMENTAL)"
355 depends on (PPC_BOOK3S || (FSL_BOOKE && !SMP)) && EXPERIMENTAL
357 kexec is a system call that implements the ability to shutdown your
358 current kernel, and to start another kernel. It is like a reboot
359 but it is independent of the system firmware. And like a reboot
360 you can start any kernel with it, not just Linux.
362 The name comes from the similarity to the exec system call.
364 It is an ongoing process to be certain the hardware in a machine
365 is properly shutdown, so do not be surprised if this code does not
366 initially work for you. It may help to enable device hotplugging
367 support. As of this writing the exact hardware interface is
368 strongly in flux, so no good recommendation can be made.
371 bool "Build a kdump crash kernel"
372 depends on PPC64 || 6xx
373 select RELOCATABLE if PPC64
375 Build a kernel suitable for use as a kdump capture kernel.
376 The same kernel binary can be used as production kernel and dump
380 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
381 depends on PPC_PSERIES && EXPERIMENTAL
383 Hypervisor-assisted dump is meant to be a kdump replacement
384 offering robustness and speed not possible without system
385 hypervisor assistance.
390 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
391 default y if PPC_PREP
394 bool "Distribute interrupts on all CPUs by default"
395 depends on SMP && !MV64360
397 This option gives the kernel permission to distribute IRQs across
398 multiple CPUs. Saying N here will route all IRQs to the first
399 CPU. Generally saying Y is safe, although some problems have been
400 reported with SMP Power Macintoshes with this option enabled.
403 bool "Support sparse irq numbering"
406 This enables support for sparse irqs. This is useful for distro
407 kernels that want to define a high CONFIG_NR_CPUS value but still
408 want to have low kernel memory footprint on smaller machines.
410 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
411 out the irq_desc[] array in a more NUMA-friendly way. )
413 If you don't know what to do here, say Y.
418 default y if SMP && PPC_PSERIES
424 depends on NEED_MULTIPLE_NODES
426 config MAX_ACTIVE_REGIONS
428 default "256" if PPC64
431 config ARCH_SELECT_MEMORY_MODEL
435 config ARCH_FLATMEM_ENABLE
437 depends on (PPC64 && !NUMA) || PPC32
439 config ARCH_SPARSEMEM_ENABLE
442 select SPARSEMEM_VMEMMAP_ENABLE
444 config ARCH_SPARSEMEM_DEFAULT
446 depends on (SMP && PPC_PSERIES) || PPC_PS3
448 config ARCH_POPULATES_NODE_MAP
451 config SYS_SUPPORTS_HUGETLBFS
453 depends on PPC_BOOK3S_64
457 config ARCH_MEMORY_PROBE
459 depends on MEMORY_HOTPLUG
461 # Some NUMA nodes have memory ranges that span
462 # other nodes. Even though a pfn is valid and
463 # between a node's start and end pfns, it may not
464 # reside on that node. See memmap_init_zone()
466 config NODES_SPAN_OTHER_NODES
468 depends on NEED_MULTIPLE_NODES
470 config PPC_HAS_HASH_64K
476 bool "Using standard binutils settings"
480 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
481 Note, that kernel will be able to run only those applications,
482 which had been compiled using binutils later than 2.17.50.0.3 with
483 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
484 the older binutils, you can patch them with a trivial patch, which
485 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
491 Select the kernel logical page size. Increasing the page size
492 will reduce software overhead at each page boundary, allow
493 hardware prefetch mechanisms to be more effective, and allow
494 larger dma transfers increasing IO efficiency and reducing
495 overhead. However the utilization of memory will increase.
496 For example, each cached file will using a multiple of the
497 page size to hold its contents and the difference between the
498 end of file and the end of page is wasted.
500 Some dedicated systems, such as software raid serving with
501 accelerated calculations, have shown significant increases.
503 If you configure a 64 bit kernel for 64k pages but the
504 processor does not support them, then the kernel will simulate
505 them with 4k pages, loading them on demand, but with the
506 reduced software overhead and larger internal fragmentation.
507 For the 32 bit kernel, a large page option will not be offered
508 unless it is supported by the configured processor.
510 If unsure, choose 4K_PAGES.
516 bool "16k page size" if 44x
519 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
520 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
522 config PPC_256K_PAGES
523 bool "256k page size" if 44x
524 depends on !STDBINUTILS
526 Make the page size 256k.
528 As the ELF standard only requires alignment to support page
529 sizes up to 64k, you will need to compile all of your user
530 space applications with a non-standard binutils settings
531 (see the STDBINUTILS description for details).
533 Say N unless you know what you are doing.
537 config FORCE_MAX_ZONEORDER
538 int "Maximum zone order"
539 range 9 64 if PPC64 && PPC_64K_PAGES
540 default "9" if PPC64 && PPC_64K_PAGES
541 range 13 64 if PPC64 && !PPC_64K_PAGES
542 default "13" if PPC64 && !PPC_64K_PAGES
543 range 9 64 if PPC32 && PPC_16K_PAGES
544 default "9" if PPC32 && PPC_16K_PAGES
545 range 7 64 if PPC32 && PPC_64K_PAGES
546 default "7" if PPC32 && PPC_64K_PAGES
547 range 5 64 if PPC32 && PPC_256K_PAGES
548 default "5" if PPC32 && PPC_256K_PAGES
552 The kernel memory allocator divides physically contiguous memory
553 blocks into "zones", where each zone is a power of two number of
554 pages. This option selects the largest power of two that the kernel
555 keeps in the memory allocator. If you need to allocate very large
556 blocks of physically contiguous memory, then you may need to
559 This config option is actually maximum order plus one. For example,
560 a value of 11 means that the largest free memory block is 2^10 pages.
562 The page size is not necessarily 4KB. For example, on 64-bit
563 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
564 this in mind when choosing a value for this option.
566 config PPC_SUBPAGE_PROT
567 bool "Support setting protections for 4k subpages"
568 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
570 This option adds support for a system call to allow user programs
571 to set access permissions (read/write, readonly, or no access)
572 on the 4k subpages of each 64k page.
575 bool "SMT (Hyperthreading) scheduler support"
576 depends on PPC64 && SMP
578 SMT scheduler support improves the CPU scheduler's decision making
579 when dealing with POWER5 cpus at a cost of slightly increased
580 overhead in some places. If unsure say N here.
582 config PROC_DEVICETREE
583 bool "Support for device tree in /proc"
586 This option adds a device-tree directory under /proc which contains
587 an image of the device tree that the kernel copies from Open
588 Firmware or other boot firmware. If unsure, say Y here.
591 bool "Default bootloader kernel arguments"
594 string "Initial kernel command string"
595 depends on CMDLINE_BOOL
596 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
598 On some platforms, there is currently no way for the boot loader to
599 pass arguments to the kernel. For these platforms, you can supply
600 some command-line options at build time by entering them here. In
601 most cases you will need to specify the root device here.
604 string "Additional default image types"
606 List additional targets to be built by the bootwrapper here (separated
607 by spaces). This is useful for targets that depend of device tree
608 files in the .dts directory.
610 Targets in this list will be build as part of the default build
611 target, or when the user does a 'make zImage' or a
612 'make zImage.initrd'.
614 If unsure, leave blank
617 config ARCH_WANTS_FREEZER_CONTROL
621 source kernel/power/Kconfig
625 bool "Enable seccomp to safely compute untrusted bytecode"
629 This kernel feature is useful for number crunching applications
630 that may need to compute untrusted bytecode during their
631 execution. By using pipes or other transports made available to
632 the process as file descriptors supporting the read/write
633 syscalls, it's possible to isolate those applications in
634 their own address space using seccomp. Once seccomp is
635 enabled via /proc/<pid>/seccomp, it cannot be disabled
636 and the task is only allowed to execute a few safe syscalls
637 defined by each seccomp mode.
639 If unsure, say Y. Only embedded should say N here.
645 default !PPC_ISERIES || PCI
650 bool "Support for ISA-bus hardware"
651 depends on PPC_PREP || PPC_CHRP
654 Find out whether you have ISA slots on your motherboard. ISA is the
655 name of a bus system, i.e. the way the CPU talks to the other stuff
656 inside your box. If you have an Apple machine, say N here; if you
657 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
658 you have an embedded board, consult your board documentation.
664 config NEED_DMA_MAP_STATE
665 def_bool (PPC64 || NOT_COHERENT_CACHE)
667 config NEED_SG_DMA_LENGTH
670 config GENERIC_ISA_DMA
672 depends on PPC64 || POWER4 || 6xx && !CPM2
675 config PPC_INDIRECT_PCI
678 default y if 40x || 44x
692 select PPC_INDIRECT_PCI
698 depends on SUSPEND && (PPC_85xx || PPC_86xx)
700 Freescale MPC85xx/MPC86xx power management controller support
701 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
709 Freescale Localbus support
713 depends on PPC_83xx || QUICC_ENGINE || CPM2
715 Freescale General-purpose Timers support
717 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
721 # Platforms that what PCI turned unconditionally just do select PCI
722 # in their config node. Platforms that want to choose at config
723 # time should select PPC_PCI_CHOICE
724 config PPC_PCI_CHOICE
728 bool "PCI support" if PPC_PCI_CHOICE
729 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
730 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
731 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
732 default PCI_QSPAN if !4xx && !CPM2 && 8xx
733 select ARCH_SUPPORTS_MSI
735 Find out whether your system includes a PCI bus. PCI is the name of
736 a bus system, i.e. the way the CPU talks to the other stuff inside
737 your box. If you say Y here, the kernel will include drivers and
738 infrastructure code to support PCI bus devices.
748 depends on !4xx && !CPM2 && 8xx
751 Say Y here if you have a system based on a Motorola 8xx-series
752 embedded processor with a QSPAN PCI interface, otherwise say N.
756 depends on PCI && 8260
757 select PPC_INDIRECT_PCI
761 bool "Enable workaround for MPC826x erratum PCI 9"
762 depends on PCI_8260 && !8272
766 prompt "IDMA channel for PCI 9 workaround"
769 config 8260_PCI9_IDMA1
772 config 8260_PCI9_IDMA2
775 config 8260_PCI9_IDMA3
778 config 8260_PCI9_IDMA4
783 source "drivers/pci/pcie/Kconfig"
785 source "drivers/pci/Kconfig"
787 source "drivers/pcmcia/Kconfig"
789 source "drivers/pci/hotplug/Kconfig"
796 bool "RapidIO support"
797 depends on HAS_RAPIDIO
799 If you say Y here, the kernel will include drivers and
800 infrastructure code to support RapidIO interconnect devices.
802 source "drivers/rapidio/Kconfig"
806 menu "Advanced setup"
809 config ADVANCED_OPTIONS
810 bool "Prompt for advanced kernel configuration options"
812 This option will enable prompting for a variety of advanced kernel
813 configuration options. These options can cause the kernel to not
814 work if they are set incorrectly, but can be used to optimize certain
815 aspects of kernel memory management.
817 Unless you know what you are doing, say N here.
819 comment "Default settings for advanced configuration options are used"
820 depends on !ADVANCED_OPTIONS
822 config LOWMEM_SIZE_BOOL
823 bool "Set maximum low memory"
824 depends on ADVANCED_OPTIONS
826 This option allows you to set the maximum amount of memory which
827 will be used as "low memory", that is, memory which the kernel can
828 access directly, without having to set up a kernel virtual mapping.
829 This can be useful in optimizing the layout of kernel virtual
832 Say N here unless you know what you are doing.
835 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
838 config LOWMEM_CAM_NUM_BOOL
839 bool "Set number of CAMs to use to map low memory"
840 depends on ADVANCED_OPTIONS && FSL_BOOKE
842 This option allows you to set the maximum number of CAM slots that
843 will be used to map low memory. There are a limited number of slots
844 available and even more limited number that will fit in the L1 MMU.
845 However, using more entries will allow mapping more low memory. This
846 can be useful in optimizing the layout of kernel virtual memory.
848 Say N here unless you know what you are doing.
850 config LOWMEM_CAM_NUM
852 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
856 bool "Build a relocatable kernel (EXPERIMENTAL)"
857 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
859 This builds a kernel image that is capable of running at the
860 location the kernel is loaded at (some alignment restrictions may
863 One use is for the kexec on panic case where the recovery kernel
864 must live at a different physical address than the primary
867 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
868 it has been loaded at and the compile time physical addresses
869 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
870 setting can still be useful to bootwrappers that need to know the
871 load location of the kernel (eg. u-boot/mkimage).
873 config PAGE_OFFSET_BOOL
874 bool "Set custom page offset address"
875 depends on ADVANCED_OPTIONS
877 This option allows you to set the kernel virtual address at which
878 the kernel will map low memory. This can be useful in optimizing
879 the virtual memory layout of the system.
881 Say N here unless you know what you are doing.
884 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
887 config KERNEL_START_BOOL
888 bool "Set custom kernel base address"
889 depends on ADVANCED_OPTIONS
891 This option allows you to set the kernel virtual address at which
892 the kernel will be loaded. Normally this should match PAGE_OFFSET
893 however there are times (like kdump) that one might not want them
896 Say N here unless you know what you are doing.
899 hex "Virtual address of kernel base" if KERNEL_START_BOOL
900 default PAGE_OFFSET if PAGE_OFFSET_BOOL
901 default "0xc2000000" if CRASH_DUMP
904 config PHYSICAL_START_BOOL
905 bool "Set physical address where the kernel is loaded"
906 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
908 This gives the physical address where the kernel is loaded.
910 Say N here unless you know what you are doing.
912 config PHYSICAL_START
913 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
914 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
917 config PHYSICAL_ALIGN
919 default "0x04000000" if FSL_BOOKE
921 This value puts the alignment restrictions on physical address
922 where kernel is loaded and run from. Kernel is compiled for an
923 address which meets above alignment restriction.
925 config TASK_SIZE_BOOL
926 bool "Set custom user task size"
927 depends on ADVANCED_OPTIONS
929 This option allows you to set the amount of virtual address space
930 allocated to user tasks. This can be useful in optimizing the
931 virtual memory layout of the system.
933 Say N here unless you know what you are doing.
936 hex "Size of user task space" if TASK_SIZE_BOOL
937 default "0x80000000" if PPC_PREP || PPC_8xx
940 config CONSISTENT_SIZE_BOOL
941 bool "Set custom consistent memory pool size"
942 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
944 This option allows you to set the size of the
945 consistent memory pool. This pool of virtual memory
946 is used to make consistent memory allocations.
948 config CONSISTENT_SIZE
949 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
950 default "0x00200000" if NOT_COHERENT_CACHE
953 bool "Pinned Kernel TLBs (860 ONLY)"
954 depends on ADVANCED_OPTIONS && 8xx
959 bool "Build a relocatable kernel"
961 This builds a kernel image that is capable of running anywhere
962 in the RMA (real memory area) at any 16k-aligned base address.
963 The kernel is linked as a position-independent executable (PIE)
964 and contains dynamic relocations which are processed early
965 in the bootup process.
967 One use is for the kexec on panic case where the recovery kernel
968 must live at a different physical address than the primary
973 default "0xc000000000000000"
976 default "0xc000000000000000"
977 config PHYSICAL_START
984 source "drivers/Kconfig"
988 source "arch/powerpc/sysdev/qe_lib/Kconfig"
992 source "arch/powerpc/Kconfig.debug"
994 source "security/Kconfig"
998 depends on COMPAT && KEYS
1001 source "crypto/Kconfig"
1008 config PPC_LIB_RHEAP
1011 source "arch/powerpc/kvm/Kconfig"