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 HAVE_SETUP_PER_CPU_AREA
52 config STACKTRACE_SUPPORT
56 config HAVE_LATENCYTOP_SUPPORT
59 config TRACE_IRQFLAGS_SUPPORT
64 config LOCKDEP_SUPPORT
68 config RWSEM_GENERIC_SPINLOCK
71 config RWSEM_XCHGADD_ALGORITHM
75 config GENERIC_LOCKBREAK
78 depends on SMP && PREEMPT
80 config ARCH_HAS_ILOG2_U32
84 config ARCH_HAS_ILOG2_U64
88 config GENERIC_HWEIGHT
92 config GENERIC_CALIBRATE_DELAY
96 config GENERIC_FIND_NEXT_BIT
103 Generic GPIO API support
105 config ARCH_NO_VIRT_TO_BUS
111 select HAVE_FTRACE_MCOUNT_RECORD
112 select HAVE_DYNAMIC_FTRACE
113 select HAVE_FUNCTION_TRACER
114 select HAVE_FUNCTION_GRAPH_TRACER
115 select ARCH_WANT_OPTIONAL_GPIOLIB
117 select HAVE_IOREMAP_PROT
118 select HAVE_EFFICIENT_UNALIGNED_ACCESS
120 select HAVE_ARCH_KGDB
121 select HAVE_KRETPROBES
122 select HAVE_ARCH_TRACEHOOK
124 select HAVE_DMA_ATTRS if PPC64
125 select USE_GENERIC_SMP_HELPERS if SMP
127 select HAVE_SYSCALL_WRAPPERS if PPC64
136 select COMPAT_BINFMT_ELF
138 config SYSVIPC_COMPAT
140 depends on COMPAT && SYSVIPC
143 # All PPC32s use generic nvram driver through ppc_md
148 config SCHED_OMIT_FRAME_POINTER
152 config ARCH_MAY_HAVE_PC_FDC
154 default !PPC_PSERIES || PCI
162 config PPC_UDBG_16550
166 config GENERIC_TBSYNC
168 default y if PPC32 && SMP
180 config SYS_SUPPORTS_APM_EMULATION
181 default y if PMAC_APM_EMU
184 config DEFAULT_UIMAGE
187 Used to allow a board to specify it wants a uImage built by default
195 depends on (PPC_PMAC && !SMP) || BROKEN
200 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
203 config ARCH_HIBERNATION_POSSIBLE
205 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
208 config ARCH_SUSPEND_POSSIBLE
210 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
212 config PPC_DCR_NATIVE
222 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
225 config PPC_OF_PLATFORM_PCI
228 depends on PPC64 # not supported on 32 bits yet
231 source "init/Kconfig"
233 source "kernel/Kconfig.freezer"
235 source "arch/powerpc/sysdev/Kconfig"
236 source "arch/powerpc/platforms/Kconfig"
238 menu "Kernel options"
241 bool "High memory support"
244 source kernel/time/Kconfig
245 source kernel/Kconfig.hz
246 source kernel/Kconfig.preempt
247 source "fs/Kconfig.binfmt"
249 config HUGETLB_PAGE_SIZE_VARIABLE
251 depends on HUGETLB_PAGE
254 config MATH_EMULATION
255 bool "Math emulation"
256 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
258 Some PowerPC chips designed for embedded applications do not have
259 a floating-point unit and therefore do not implement the
260 floating-point instructions in the PowerPC instruction set. If you
261 say Y here, the kernel will include code to emulate a floating-point
262 unit, which will allow programs that use floating-point
265 config 8XX_MINIMAL_FPEMU
266 bool "Minimal math emulation for 8xx"
267 depends on 8xx && !MATH_EMULATION
269 Older arch/ppc kernels still emulated a few floating point
270 instructions such as load and store, even when full math
271 emulation is disabled. Say "Y" here if you want to preserve
274 It is recommended that you build a soft-float userspace instead.
277 bool "Enable IOMMU virtual merging"
281 Cause IO segments sent to a device for DMA to be merged virtually
282 by the IOMMU when they happen to have been allocated contiguously.
283 This doesn't add pressure to the IOMMU allocator. However, some
284 drivers don't support getting large merged segments coming back
287 Most drivers don't have this problem; it is safe to say Y here.
292 config PPC_NEED_DMA_SYNC_OPS
294 depends on NOT_COHERENT_CACHE
297 bool "Support for enabling/disabling CPUs"
298 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
300 Say Y here to be able to disable and re-enable individual
301 CPUs at runtime on SMP machines.
303 Say N if you are unsure.
305 config ARCH_ENABLE_MEMORY_HOTPLUG
308 config ARCH_HAS_WALK_MEMORY
311 config ARCH_ENABLE_MEMORY_HOTREMOVE
315 bool "kexec system call (EXPERIMENTAL)"
316 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
318 kexec is a system call that implements the ability to shutdown your
319 current kernel, and to start another kernel. It is like a reboot
320 but it is independent of the system firmware. And like a reboot
321 you can start any kernel with it, not just Linux.
323 The name comes from the similarity to the exec system call.
325 It is an ongoing process to be certain the hardware in a machine
326 is properly shutdown, so do not be surprised if this code does not
327 initially work for you. It may help to enable device hotplugging
328 support. As of this writing the exact hardware interface is
329 strongly in flux, so no good recommendation can be made.
332 bool "Build a kdump crash kernel"
333 depends on PPC64 || 6xx
334 select RELOCATABLE if PPC64
336 Build a kernel suitable for use as a kdump capture kernel.
337 The same kernel binary can be used as production kernel and dump
341 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
342 depends on PPC_PSERIES && EXPERIMENTAL
344 Hypervisor-assisted dump is meant to be a kdump replacement
345 offering robustness and speed not possible without system
346 hypervisor assistence.
351 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
352 default y if PPC_PREP
355 bool "Distribute interrupts on all CPUs by default"
356 depends on SMP && !MV64360
358 This option gives the kernel permission to distribute IRQs across
359 multiple CPUs. Saying N here will route all IRQs to the first
360 CPU. Generally saying Y is safe, although some problems have been
361 reported with SMP Power Macintoshes with this option enabled.
366 default y if SMP && PPC_PSERIES
371 depends on NEED_MULTIPLE_NODES
373 config ARCH_SELECT_MEMORY_MODEL
377 config ARCH_FLATMEM_ENABLE
379 depends on (PPC64 && !NUMA) || PPC32
381 config ARCH_SPARSEMEM_ENABLE
384 select SPARSEMEM_VMEMMAP_ENABLE
386 config ARCH_SPARSEMEM_DEFAULT
388 depends on (SMP && PPC_PSERIES) || PPC_PS3
390 config ARCH_POPULATES_NODE_MAP
395 config ARCH_MEMORY_PROBE
397 depends on MEMORY_HOTPLUG
399 # Some NUMA nodes have memory ranges that span
400 # other nodes. Even though a pfn is valid and
401 # between a node's start and end pfns, it may not
402 # reside on that node. See memmap_init_zone()
404 config NODES_SPAN_OTHER_NODES
406 depends on NEED_MULTIPLE_NODES
408 config PPC_HAS_HASH_64K
414 bool "Using standard binutils settings"
418 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
419 Note, that kernel will be able to run only those applications,
420 which had been compiled using binutils later than 2.17.50.0.3 with
421 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
422 the older binutils, you can patch them with a trivial patch, which
423 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
429 Select the kernel logical page size. Increasing the page size
430 will reduce software overhead at each page boundary, allow
431 hardware prefetch mechanisms to be more effective, and allow
432 larger dma transfers increasing IO efficiency and reducing
433 overhead. However the utilization of memory will increase.
434 For example, each cached file will using a multiple of the
435 page size to hold its contents and the difference between the
436 end of file and the end of page is wasted.
438 Some dedicated systems, such as software raid serving with
439 accelerated calculations, have shown significant increases.
441 If you configure a 64 bit kernel for 64k pages but the
442 processor does not support them, then the kernel will simulate
443 them with 4k pages, loading them on demand, but with the
444 reduced software overhead and larger internal fragmentation.
445 For the 32 bit kernel, a large page option will not be offered
446 unless it is supported by the configured processor.
448 If unsure, choose 4K_PAGES.
454 bool "16k page size" if 44x
457 bool "64k page size" if 44x || PPC_STD_MMU_64
458 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
460 config PPC_256K_PAGES
461 bool "256k page size" if 44x
462 depends on !STDBINUTILS && (!SHMEM || BROKEN)
464 Make the page size 256k.
466 As the ELF standard only requires alignment to support page
467 sizes up to 64k, you will need to compile all of your user
468 space applications with a non-standard binutils settings
469 (see the STDBINUTILS description for details).
471 Say N unless you know what you are doing.
475 config FORCE_MAX_ZONEORDER
476 int "Maximum zone order"
477 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
478 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
479 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
480 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
481 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
482 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
483 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
484 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
485 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
486 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
490 The kernel memory allocator divides physically contiguous memory
491 blocks into "zones", where each zone is a power of two number of
492 pages. This option selects the largest power of two that the kernel
493 keeps in the memory allocator. If you need to allocate very large
494 blocks of physically contiguous memory, then you may need to
497 This config option is actually maximum order plus one. For example,
498 a value of 11 means that the largest free memory block is 2^10 pages.
500 The page size is not necessarily 4KB. For example, on 64-bit
501 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
502 this in mind when choosing a value for this option.
504 config PPC_SUBPAGE_PROT
505 bool "Support setting protections for 4k subpages"
506 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
508 This option adds support for a system call to allow user programs
509 to set access permissions (read/write, readonly, or no access)
510 on the 4k subpages of each 64k page.
513 bool "SMT (Hyperthreading) scheduler support"
514 depends on PPC64 && SMP
516 SMT scheduler support improves the CPU scheduler's decision making
517 when dealing with POWER5 cpus at a cost of slightly increased
518 overhead in some places. If unsure say N here.
520 config PROC_DEVICETREE
521 bool "Support for device tree in /proc"
524 This option adds a device-tree directory under /proc which contains
525 an image of the device tree that the kernel copies from Open
526 Firmware or other boot firmware. If unsure, say Y here.
529 bool "Default bootloader kernel arguments"
532 string "Initial kernel command string"
533 depends on CMDLINE_BOOL
534 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
536 On some platforms, there is currently no way for the boot loader to
537 pass arguments to the kernel. For these platforms, you can supply
538 some command-line options at build time by entering them here. In
539 most cases you will need to specify the root device here.
542 string "Additional default image types"
544 List additional targets to be built by the bootwrapper here (separated
545 by spaces). This is useful for targets that depend of device tree
546 files in the .dts directory.
548 Targets in this list will be build as part of the default build
549 target, or when the user does a 'make zImage' or a
550 'make zImage.initrd'.
552 If unsure, leave blank
555 config ARCH_WANTS_FREEZER_CONTROL
559 source kernel/power/Kconfig
563 bool "Enable seccomp to safely compute untrusted bytecode"
567 This kernel feature is useful for number crunching applications
568 that may need to compute untrusted bytecode during their
569 execution. By using pipes or other transports made available to
570 the process as file descriptors supporting the read/write
571 syscalls, it's possible to isolate those applications in
572 their own address space using seccomp. Once seccomp is
573 enabled via /proc/<pid>/seccomp, it cannot be disabled
574 and the task is only allowed to execute a few safe syscalls
575 defined by each seccomp mode.
577 If unsure, say Y. Only embedded should say N here.
583 default !PPC_ISERIES || PCI
588 bool "Support for ISA-bus hardware"
589 depends on PPC_PREP || PPC_CHRP
592 Find out whether you have ISA slots on your motherboard. ISA is the
593 name of a bus system, i.e. the way the CPU talks to the other stuff
594 inside your box. If you have an Apple machine, say N here; if you
595 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
596 you have an embedded board, consult your board documentation.
602 config GENERIC_ISA_DMA
604 depends on PPC64 || POWER4 || 6xx && !CPM2
607 config PPC_INDIRECT_PCI
610 default y if 40x || 44x
624 select PPC_INDIRECT_PCI
633 Freescale Localbus support
637 depends on PPC_83xx || QUICC_ENGINE || CPM2
639 Freescale General-purpose Timers support
641 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
645 # Platforms that what PCI turned unconditionally just do select PCI
646 # in their config node. Platforms that want to choose at config
647 # time should select PPC_PCI_CHOICE
648 config PPC_PCI_CHOICE
652 bool "PCI support" if PPC_PCI_CHOICE
653 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
654 && !PPC_85xx && !PPC_86xx
655 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
656 default PCI_QSPAN if !4xx && !CPM2 && 8xx
657 select ARCH_SUPPORTS_MSI
659 Find out whether your system includes a PCI bus. PCI is the name of
660 a bus system, i.e. the way the CPU talks to the other stuff inside
661 your box. If you say Y here, the kernel will include drivers and
662 infrastructure code to support PCI bus devices.
672 depends on !4xx && !CPM2 && 8xx
675 Say Y here if you have a system based on a Motorola 8xx-series
676 embedded processor with a QSPAN PCI interface, otherwise say N.
680 depends on PCI && 8260
681 select PPC_INDIRECT_PCI
685 bool "Enable workaround for MPC826x erratum PCI 9"
686 depends on PCI_8260 && !8272
690 prompt "IDMA channel for PCI 9 workaround"
693 config 8260_PCI9_IDMA1
696 config 8260_PCI9_IDMA2
699 config 8260_PCI9_IDMA3
702 config 8260_PCI9_IDMA4
707 source "drivers/pci/pcie/Kconfig"
709 source "drivers/pci/Kconfig"
711 source "drivers/pcmcia/Kconfig"
713 source "drivers/pci/hotplug/Kconfig"
720 bool "RapidIO support"
721 depends on HAS_RAPIDIO
723 If you say Y here, the kernel will include drivers and
724 infrastructure code to support RapidIO interconnect devices.
726 source "drivers/rapidio/Kconfig"
730 menu "Advanced setup"
733 config ADVANCED_OPTIONS
734 bool "Prompt for advanced kernel configuration options"
736 This option will enable prompting for a variety of advanced kernel
737 configuration options. These options can cause the kernel to not
738 work if they are set incorrectly, but can be used to optimize certain
739 aspects of kernel memory management.
741 Unless you know what you are doing, say N here.
743 comment "Default settings for advanced configuration options are used"
744 depends on !ADVANCED_OPTIONS
746 config LOWMEM_SIZE_BOOL
747 bool "Set maximum low memory"
748 depends on ADVANCED_OPTIONS
750 This option allows you to set the maximum amount of memory which
751 will be used as "low memory", that is, memory which the kernel can
752 access directly, without having to set up a kernel virtual mapping.
753 This can be useful in optimizing the layout of kernel virtual
756 Say N here unless you know what you are doing.
759 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
762 config LOWMEM_CAM_NUM_BOOL
763 bool "Set number of CAMs to use to map low memory"
764 depends on ADVANCED_OPTIONS && FSL_BOOKE
766 This option allows you to set the maximum number of CAM slots that
767 will be used to map low memory. There are a limited number of slots
768 available and even more limited number that will fit in the L1 MMU.
769 However, using more entries will allow mapping more low memory. This
770 can be useful in optimizing the layout of kernel virtual memory.
772 Say N here unless you know what you are doing.
774 config LOWMEM_CAM_NUM
775 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
779 bool "Build a relocatable kernel (EXPERIMENTAL)"
780 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
782 This builds a kernel image that is capable of running at the
783 location the kernel is loaded at (some alignment restrictions may
786 One use is for the kexec on panic case where the recovery kernel
787 must live at a different physical address than the primary
790 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
791 it has been loaded at and the compile time physical addresses
792 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
793 setting can still be useful to bootwrappers that need to know the
794 load location of the kernel (eg. u-boot/mkimage).
796 config PAGE_OFFSET_BOOL
797 bool "Set custom page offset address"
798 depends on ADVANCED_OPTIONS
800 This option allows you to set the kernel virtual address at which
801 the kernel will map low memory. This can be useful in optimizing
802 the virtual memory layout of the system.
804 Say N here unless you know what you are doing.
807 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
810 config KERNEL_START_BOOL
811 bool "Set custom kernel base address"
812 depends on ADVANCED_OPTIONS
814 This option allows you to set the kernel virtual address at which
815 the kernel will be loaded. Normally this should match PAGE_OFFSET
816 however there are times (like kdump) that one might not want them
819 Say N here unless you know what you are doing.
822 hex "Virtual address of kernel base" if KERNEL_START_BOOL
823 default PAGE_OFFSET if PAGE_OFFSET_BOOL
824 default "0xc2000000" if CRASH_DUMP
827 config PHYSICAL_START_BOOL
828 bool "Set physical address where the kernel is loaded"
829 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
831 This gives the physical address where the kernel is loaded.
833 Say N here unless you know what you are doing.
835 config PHYSICAL_START
836 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
837 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
840 config PHYSICAL_ALIGN
842 default "0x04000000" if FSL_BOOKE
844 This value puts the alignment restrictions on physical address
845 where kernel is loaded and run from. Kernel is compiled for an
846 address which meets above alignment restriction.
848 config TASK_SIZE_BOOL
849 bool "Set custom user task size"
850 depends on ADVANCED_OPTIONS
852 This option allows you to set the amount of virtual address space
853 allocated to user tasks. This can be useful in optimizing the
854 virtual memory layout of the system.
856 Say N here unless you know what you are doing.
859 hex "Size of user task space" if TASK_SIZE_BOOL
860 default "0x80000000" if PPC_PREP || PPC_8xx
864 bool "Pinned Kernel TLBs (860 ONLY)"
865 depends on ADVANCED_OPTIONS && 8xx
870 bool "Build a relocatable kernel"
872 This builds a kernel image that is capable of running anywhere
873 in the RMA (real memory area) at any 16k-aligned base address.
874 The kernel is linked as a position-independent executable (PIE)
875 and contains dynamic relocations which are processed early
876 in the bootup process.
878 One use is for the kexec on panic case where the recovery kernel
879 must live at a different physical address than the primary
884 default "0xc000000000000000"
887 default "0xc000000000000000"
888 config PHYSICAL_START
895 source "drivers/Kconfig"
899 source "arch/powerpc/sysdev/qe_lib/Kconfig"
903 source "arch/powerpc/Kconfig.debug"
905 source "security/Kconfig"
909 depends on COMPAT && KEYS
912 source "crypto/Kconfig"
922 source "arch/powerpc/kvm/Kconfig"