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_FUNCTION_TRACER
112 select ARCH_WANT_OPTIONAL_GPIOLIB
114 select HAVE_IOREMAP_PROT
115 select HAVE_EFFICIENT_UNALIGNED_ACCESS
117 select HAVE_ARCH_KGDB
118 select HAVE_KRETPROBES
119 select HAVE_ARCH_TRACEHOOK
121 select HAVE_DMA_ATTRS if PPC64
122 select USE_GENERIC_SMP_HELPERS if SMP
132 select COMPAT_BINFMT_ELF
134 config SYSVIPC_COMPAT
136 depends on COMPAT && SYSVIPC
139 # All PPC32s use generic nvram driver through ppc_md
144 config SCHED_OMIT_FRAME_POINTER
148 config ARCH_MAY_HAVE_PC_FDC
150 default !PPC_PSERIES || PCI
158 config PPC_UDBG_16550
162 config GENERIC_TBSYNC
164 default y if PPC32 && SMP
176 config SYS_SUPPORTS_APM_EMULATION
177 default y if PMAC_APM_EMU
180 config DEFAULT_UIMAGE
183 Used to allow a board to specify it wants a uImage built by default
191 depends on (PPC_PMAC && !SMP) || BROKEN
196 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
199 config ARCH_HIBERNATION_POSSIBLE
201 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
204 config ARCH_SUSPEND_POSSIBLE
206 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
208 config PPC_DCR_NATIVE
218 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
221 config PPC_OF_PLATFORM_PCI
224 depends on PPC64 # not supported on 32 bits yet
227 source "init/Kconfig"
229 source "kernel/Kconfig.freezer"
231 source "arch/powerpc/sysdev/Kconfig"
232 source "arch/powerpc/platforms/Kconfig"
234 menu "Kernel options"
237 bool "High memory support"
240 source kernel/time/Kconfig
241 source kernel/Kconfig.hz
242 source kernel/Kconfig.preempt
243 source "fs/Kconfig.binfmt"
245 config HUGETLB_PAGE_SIZE_VARIABLE
247 depends on HUGETLB_PAGE
250 config MATH_EMULATION
251 bool "Math emulation"
252 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
254 Some PowerPC chips designed for embedded applications do not have
255 a floating-point unit and therefore do not implement the
256 floating-point instructions in the PowerPC instruction set. If you
257 say Y here, the kernel will include code to emulate a floating-point
258 unit, which will allow programs that use floating-point
261 config 8XX_MINIMAL_FPEMU
262 bool "Minimal math emulation for 8xx"
263 depends on 8xx && !MATH_EMULATION
265 Older arch/ppc kernels still emulated a few floating point
266 instructions such as load and store, even when full math
267 emulation is disabled. Say "Y" here if you want to preserve
270 It is recommended that you build a soft-float userspace instead.
273 bool "Enable IOMMU virtual merging"
277 Cause IO segments sent to a device for DMA to be merged virtually
278 by the IOMMU when they happen to have been allocated contiguously.
279 This doesn't add pressure to the IOMMU allocator. However, some
280 drivers don't support getting large merged segments coming back
283 Most drivers don't have this problem; it is safe to say Y here.
288 config PPC_NEED_DMA_SYNC_OPS
290 depends on NOT_COHERENT_CACHE
293 bool "Support for enabling/disabling CPUs"
294 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
296 Say Y here to be able to disable and re-enable individual
297 CPUs at runtime on SMP machines.
299 Say N if you are unsure.
301 config ARCH_ENABLE_MEMORY_HOTPLUG
304 config ARCH_HAS_WALK_MEMORY
307 config ARCH_ENABLE_MEMORY_HOTREMOVE
311 bool "kexec system call (EXPERIMENTAL)"
312 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
314 kexec is a system call that implements the ability to shutdown your
315 current kernel, and to start another kernel. It is like a reboot
316 but it is independent of the system firmware. And like a reboot
317 you can start any kernel with it, not just Linux.
319 The name comes from the similarity to the exec system call.
321 It is an ongoing process to be certain the hardware in a machine
322 is properly shutdown, so do not be surprised if this code does not
323 initially work for you. It may help to enable device hotplugging
324 support. As of this writing the exact hardware interface is
325 strongly in flux, so no good recommendation can be made.
328 bool "Build a kdump crash kernel"
329 depends on (PPC64 && RELOCATABLE) || 6xx
331 Build a kernel suitable for use as a kdump capture kernel.
332 The same kernel binary can be used as production kernel and dump
336 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
337 depends on PPC_PSERIES && EXPERIMENTAL
339 Hypervisor-assisted dump is meant to be a kdump replacement
340 offering robustness and speed not possible without system
341 hypervisor assistence.
346 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
347 default y if PPC_PREP
350 bool "Distribute interrupts on all CPUs by default"
351 depends on SMP && !MV64360
353 This option gives the kernel permission to distribute IRQs across
354 multiple CPUs. Saying N here will route all IRQs to the first
355 CPU. Generally saying Y is safe, although some problems have been
356 reported with SMP Power Macintoshes with this option enabled.
361 default y if SMP && PPC_PSERIES
366 depends on NEED_MULTIPLE_NODES
368 config ARCH_SELECT_MEMORY_MODEL
372 config ARCH_FLATMEM_ENABLE
374 depends on (PPC64 && !NUMA) || PPC32
376 config ARCH_SPARSEMEM_ENABLE
379 select SPARSEMEM_VMEMMAP_ENABLE
381 config ARCH_SPARSEMEM_DEFAULT
383 depends on (SMP && PPC_PSERIES) || PPC_PS3
385 config ARCH_POPULATES_NODE_MAP
390 config ARCH_MEMORY_PROBE
392 depends on MEMORY_HOTPLUG
394 # Some NUMA nodes have memory ranges that span
395 # other nodes. Even though a pfn is valid and
396 # between a node's start and end pfns, it may not
397 # reside on that node. See memmap_init_zone()
399 config NODES_SPAN_OTHER_NODES
401 depends on NEED_MULTIPLE_NODES
403 config PPC_HAS_HASH_64K
412 Select the kernel logical page size. Increasing the page size
413 will reduce software overhead at each page boundary, allow
414 hardware prefetch mechanisms to be more effective, and allow
415 larger dma transfers increasing IO efficiency and reducing
416 overhead. However the utilization of memory will increase.
417 For example, each cached file will using a multiple of the
418 page size to hold its contents and the difference between the
419 end of file and the end of page is wasted.
421 Some dedicated systems, such as software raid serving with
422 accelerated calculations, have shown significant increases.
424 If you configure a 64 bit kernel for 64k pages but the
425 processor does not support them, then the kernel will simulate
426 them with 4k pages, loading them on demand, but with the
427 reduced software overhead and larger internal fragmentation.
428 For the 32 bit kernel, a large page option will not be offered
429 unless it is supported by the configured processor.
431 If unsure, choose 4K_PAGES.
437 bool "16k page size" if 44x
440 bool "64k page size" if 44x || PPC_STD_MMU_64
441 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
445 config FORCE_MAX_ZONEORDER
446 int "Maximum zone order"
447 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
448 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
449 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
450 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
451 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
452 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
453 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
454 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
458 The kernel memory allocator divides physically contiguous memory
459 blocks into "zones", where each zone is a power of two number of
460 pages. This option selects the largest power of two that the kernel
461 keeps in the memory allocator. If you need to allocate very large
462 blocks of physically contiguous memory, then you may need to
465 This config option is actually maximum order plus one. For example,
466 a value of 11 means that the largest free memory block is 2^10 pages.
468 The page size is not necessarily 4KB. For example, on 64-bit
469 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
470 this in mind when choosing a value for this option.
472 config PPC_SUBPAGE_PROT
473 bool "Support setting protections for 4k subpages"
474 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
476 This option adds support for a system call to allow user programs
477 to set access permissions (read/write, readonly, or no access)
478 on the 4k subpages of each 64k page.
481 bool "SMT (Hyperthreading) scheduler support"
482 depends on PPC64 && SMP
484 SMT scheduler support improves the CPU scheduler's decision making
485 when dealing with POWER5 cpus at a cost of slightly increased
486 overhead in some places. If unsure say N here.
488 config PROC_DEVICETREE
489 bool "Support for device tree in /proc"
492 This option adds a device-tree directory under /proc which contains
493 an image of the device tree that the kernel copies from Open
494 Firmware or other boot firmware. If unsure, say Y here.
497 bool "Default bootloader kernel arguments"
500 string "Initial kernel command string"
501 depends on CMDLINE_BOOL
502 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
504 On some platforms, there is currently no way for the boot loader to
505 pass arguments to the kernel. For these platforms, you can supply
506 some command-line options at build time by entering them here. In
507 most cases you will need to specify the root device here.
510 string "Additional default image types"
512 List additional targets to be built by the bootwrapper here (separated
513 by spaces). This is useful for targets that depend of device tree
514 files in the .dts directory.
516 Targets in this list will be build as part of the default build
517 target, or when the user does a 'make zImage' or a
518 'make zImage.initrd'.
520 If unsure, leave blank
523 config ARCH_WANTS_FREEZER_CONTROL
527 source kernel/power/Kconfig
531 bool "Enable seccomp to safely compute untrusted bytecode"
535 This kernel feature is useful for number crunching applications
536 that may need to compute untrusted bytecode during their
537 execution. By using pipes or other transports made available to
538 the process as file descriptors supporting the read/write
539 syscalls, it's possible to isolate those applications in
540 their own address space using seccomp. Once seccomp is
541 enabled via /proc/<pid>/seccomp, it cannot be disabled
542 and the task is only allowed to execute a few safe syscalls
543 defined by each seccomp mode.
545 If unsure, say Y. Only embedded should say N here.
551 default !PPC_ISERIES || PCI
556 bool "Support for ISA-bus hardware"
557 depends on PPC_PREP || PPC_CHRP
560 Find out whether you have ISA slots on your motherboard. ISA is the
561 name of a bus system, i.e. the way the CPU talks to the other stuff
562 inside your box. If you have an Apple machine, say N here; if you
563 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
564 you have an embedded board, consult your board documentation.
570 config GENERIC_ISA_DMA
572 depends on PPC64 || POWER4 || 6xx && !CPM2
575 config PPC_INDIRECT_PCI
578 default y if 40x || 44x
592 select PPC_INDIRECT_PCI
600 Freescale Localbus support
604 depends on PPC_83xx || QUICC_ENGINE || CPM2
606 Freescale General-purpose Timers support
608 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
612 # Platforms that what PCI turned unconditionally just do select PCI
613 # in their config node. Platforms that want to choose at config
614 # time should select PPC_PCI_CHOICE
615 config PPC_PCI_CHOICE
619 bool "PCI support" if PPC_PCI_CHOICE
620 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
621 && !PPC_85xx && !PPC_86xx
622 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
623 default PCI_QSPAN if !4xx && !CPM2 && 8xx
624 select ARCH_SUPPORTS_MSI
626 Find out whether your system includes a PCI bus. PCI is the name of
627 a bus system, i.e. the way the CPU talks to the other stuff inside
628 your box. If you say Y here, the kernel will include drivers and
629 infrastructure code to support PCI bus devices.
639 depends on !4xx && !CPM2 && 8xx
642 Say Y here if you have a system based on a Motorola 8xx-series
643 embedded processor with a QSPAN PCI interface, otherwise say N.
647 depends on PCI && 8260
648 select PPC_INDIRECT_PCI
652 bool "Enable workaround for MPC826x erratum PCI 9"
653 depends on PCI_8260 && !8272
657 prompt "IDMA channel for PCI 9 workaround"
660 config 8260_PCI9_IDMA1
663 config 8260_PCI9_IDMA2
666 config 8260_PCI9_IDMA3
669 config 8260_PCI9_IDMA4
674 source "drivers/pci/pcie/Kconfig"
676 source "drivers/pci/Kconfig"
678 source "drivers/pcmcia/Kconfig"
680 source "drivers/pci/hotplug/Kconfig"
687 bool "RapidIO support"
688 depends on HAS_RAPIDIO
690 If you say Y here, the kernel will include drivers and
691 infrastructure code to support RapidIO interconnect devices.
693 source "drivers/rapidio/Kconfig"
697 menu "Advanced setup"
700 config ADVANCED_OPTIONS
701 bool "Prompt for advanced kernel configuration options"
703 This option will enable prompting for a variety of advanced kernel
704 configuration options. These options can cause the kernel to not
705 work if they are set incorrectly, but can be used to optimize certain
706 aspects of kernel memory management.
708 Unless you know what you are doing, say N here.
710 comment "Default settings for advanced configuration options are used"
711 depends on !ADVANCED_OPTIONS
713 config LOWMEM_SIZE_BOOL
714 bool "Set maximum low memory"
715 depends on ADVANCED_OPTIONS
717 This option allows you to set the maximum amount of memory which
718 will be used as "low memory", that is, memory which the kernel can
719 access directly, without having to set up a kernel virtual mapping.
720 This can be useful in optimizing the layout of kernel virtual
723 Say N here unless you know what you are doing.
726 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
730 bool "Build a relocatable kernel (EXPERIMENTAL)"
731 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
733 This builds a kernel image that is capable of running at the
734 location the kernel is loaded at (some alignment restrictions may
737 One use is for the kexec on panic case where the recovery kernel
738 must live at a different physical address than the primary
741 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
742 it has been loaded at and the compile time physical addresses
743 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
744 setting can still be useful to bootwrappers that need to know the
745 load location of the kernel (eg. u-boot/mkimage).
747 config PAGE_OFFSET_BOOL
748 bool "Set custom page offset address"
749 depends on ADVANCED_OPTIONS
751 This option allows you to set the kernel virtual address at which
752 the kernel will map low memory. This can be useful in optimizing
753 the virtual memory layout of the system.
755 Say N here unless you know what you are doing.
758 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
761 config KERNEL_START_BOOL
762 bool "Set custom kernel base address"
763 depends on ADVANCED_OPTIONS
765 This option allows you to set the kernel virtual address at which
766 the kernel will be loaded. Normally this should match PAGE_OFFSET
767 however there are times (like kdump) that one might not want them
770 Say N here unless you know what you are doing.
773 hex "Virtual address of kernel base" if KERNEL_START_BOOL
774 default PAGE_OFFSET if PAGE_OFFSET_BOOL
775 default "0xc2000000" if CRASH_DUMP
778 config PHYSICAL_START_BOOL
779 bool "Set physical address where the kernel is loaded"
780 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
782 This gives the physical address where the kernel is loaded.
784 Say N here unless you know what you are doing.
786 config PHYSICAL_START
787 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
788 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
791 config PHYSICAL_ALIGN
793 default "0x10000000" if FSL_BOOKE
795 This value puts the alignment restrictions on physical address
796 where kernel is loaded and run from. Kernel is compiled for an
797 address which meets above alignment restriction.
799 config TASK_SIZE_BOOL
800 bool "Set custom user task size"
801 depends on ADVANCED_OPTIONS
803 This option allows you to set the amount of virtual address space
804 allocated to user tasks. This can be useful in optimizing the
805 virtual memory layout of the system.
807 Say N here unless you know what you are doing.
810 hex "Size of user task space" if TASK_SIZE_BOOL
811 default "0x80000000" if PPC_PREP || PPC_8xx
814 config CONSISTENT_START_BOOL
815 bool "Set custom consistent memory pool address"
816 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
818 This option allows you to set the base virtual address
819 of the consistent memory pool. This pool of virtual
820 memory is used to make consistent memory allocations.
822 config CONSISTENT_START
823 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
824 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
825 default "0xff100000" if NOT_COHERENT_CACHE
827 config CONSISTENT_SIZE_BOOL
828 bool "Set custom consistent memory pool size"
829 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
831 This option allows you to set the size of the
832 consistent memory pool. This pool of virtual memory
833 is used to make consistent memory allocations.
835 config CONSISTENT_SIZE
836 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
837 default "0x00200000" if NOT_COHERENT_CACHE
840 bool "Pinned Kernel TLBs (860 ONLY)"
841 depends on ADVANCED_OPTIONS && 8xx
846 bool "Build a relocatable kernel"
848 This builds a kernel image that is capable of running anywhere
849 in the RMA (real memory area) at any 16k-aligned base address.
850 The kernel is linked as a position-independent executable (PIE)
851 and contains dynamic relocations which are processed early
852 in the bootup process.
854 One use is for the kexec on panic case where the recovery kernel
855 must live at a different physical address than the primary
860 default "0xc000000000000000"
863 default "0xc000000000000000"
864 config PHYSICAL_START
871 source "drivers/Kconfig"
875 # XXX source "arch/ppc/8xx_io/Kconfig"
877 # XXX source "arch/ppc/8260_io/Kconfig"
879 source "arch/powerpc/sysdev/qe_lib/Kconfig"
883 source "arch/powerpc/Kconfig.debug"
885 source "security/Kconfig"
889 depends on COMPAT && KEYS
892 source "crypto/Kconfig"
902 source "arch/powerpc/kvm/Kconfig"