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"
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_DYNAMIC_FTRACE
113 select ARCH_WANT_OPTIONAL_GPIOLIB
115 select HAVE_IOREMAP_PROT
116 select HAVE_EFFICIENT_UNALIGNED_ACCESS
118 select HAVE_ARCH_KGDB
119 select HAVE_KRETPROBES
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_NO_NO_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 "arch/powerpc/sysdev/Kconfig"
230 source "arch/powerpc/platforms/Kconfig"
232 menu "Kernel options"
235 bool "High memory support"
238 source kernel/time/Kconfig
239 source kernel/Kconfig.hz
240 source kernel/Kconfig.preempt
241 source "fs/Kconfig.binfmt"
243 config HUGETLB_PAGE_SIZE_VARIABLE
245 depends on HUGETLB_PAGE
248 config MATH_EMULATION
249 bool "Math emulation"
250 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
252 Some PowerPC chips designed for embedded applications do not have
253 a floating-point unit and therefore do not implement the
254 floating-point instructions in the PowerPC instruction set. If you
255 say Y here, the kernel will include code to emulate a floating-point
256 unit, which will allow programs that use floating-point
259 config 8XX_MINIMAL_FPEMU
260 bool "Minimal math emulation for 8xx"
261 depends on 8xx && !MATH_EMULATION
263 Older arch/ppc kernels still emulated a few floating point
264 instructions such as load and store, even when full math
265 emulation is disabled. Say "Y" here if you want to preserve
268 It is recommended that you build a soft-float userspace instead.
271 bool "Enable IOMMU virtual merging"
275 Cause IO segments sent to a device for DMA to be merged virtually
276 by the IOMMU when they happen to have been allocated contiguously.
277 This doesn't add pressure to the IOMMU allocator. However, some
278 drivers don't support getting large merged segments coming back
281 Most drivers don't have this problem; it is safe to say Y here.
287 bool "Support for enabling/disabling CPUs"
288 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
290 Say Y here to be able to disable and re-enable individual
291 CPUs at runtime on SMP machines.
293 Say N if you are unsure.
295 config ARCH_ENABLE_MEMORY_HOTPLUG
298 config ARCH_HAS_WALK_MEMORY
301 config ARCH_ENABLE_MEMORY_HOTREMOVE
305 bool "kexec system call (EXPERIMENTAL)"
306 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
308 kexec is a system call that implements the ability to shutdown your
309 current kernel, and to start another kernel. It is like a reboot
310 but it is independent of the system firmware. And like a reboot
311 you can start any kernel with it, not just Linux.
313 The name comes from the similarity to the exec system call.
315 It is an ongoing process to be certain the hardware in a machine
316 is properly shutdown, so do not be surprised if this code does not
317 initially work for you. It may help to enable device hotplugging
318 support. As of this writing the exact hardware interface is
319 strongly in flux, so no good recommendation can be made.
322 bool "Build a kdump crash kernel"
323 depends on PPC_MULTIPLATFORM && PPC64
325 Build a kernel suitable for use as a kdump capture kernel.
326 The kernel will be linked at a different address than normal, and
327 so can only be used for Kdump.
329 Don't change this unless you know what you are doing.
332 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
333 depends on PPC_PSERIES && EXPERIMENTAL
335 Hypervisor-assisted dump is meant to be a kdump replacement
336 offering robustness and speed not possible without system
337 hypervisor assistence.
342 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
343 default y if PPC_PREP
346 bool "Distribute interrupts on all CPUs by default"
347 depends on SMP && !MV64360
349 This option gives the kernel permission to distribute IRQs across
350 multiple CPUs. Saying N here will route all IRQs to the first
351 CPU. Generally saying Y is safe, although some problems have been
352 reported with SMP Power Macintoshes with this option enabled.
357 default y if SMP && PPC_PSERIES
362 depends on NEED_MULTIPLE_NODES
364 config ARCH_SELECT_MEMORY_MODEL
368 config ARCH_FLATMEM_ENABLE
370 depends on (PPC64 && !NUMA) || PPC32
372 config ARCH_SPARSEMEM_ENABLE
375 select SPARSEMEM_VMEMMAP_ENABLE
377 config ARCH_SPARSEMEM_DEFAULT
379 depends on (SMP && PPC_PSERIES) || PPC_PS3
381 config ARCH_POPULATES_NODE_MAP
386 config ARCH_MEMORY_PROBE
388 depends on MEMORY_HOTPLUG
390 # Some NUMA nodes have memory ranges that span
391 # other nodes. Even though a pfn is valid and
392 # between a node's start and end pfns, it may not
393 # reside on that node. See memmap_init_zone()
395 config NODES_SPAN_OTHER_NODES
397 depends on NEED_MULTIPLE_NODES
399 config PPC_HAS_HASH_64K
407 select PPC_HAS_HASH_64K
409 This option changes the kernel logical page size to 64k. On machines
410 without processor support for 64k pages, the kernel will simulate
411 them by loading each individual 4k page on demand transparently,
412 while on hardware with such support, it will be used to map
413 normal application pages.
415 config FORCE_MAX_ZONEORDER
416 int "Maximum zone order"
417 default "9" if PPC_64K_PAGES
418 default "13" if PPC64 && !PPC_64K_PAGES
421 The kernel memory allocator divides physically contiguous memory
422 blocks into "zones", where each zone is a power of two number of
423 pages. This option selects the largest power of two that the kernel
424 keeps in the memory allocator. If you need to allocate very large
425 blocks of physically contiguous memory, then you may need to
428 This config option is actually maximum order plus one. For example,
429 a value of 11 means that the largest free memory block is 2^10 pages.
431 The page size is not necessarily 4KB. For example, on 64-bit
432 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
433 this in mind when choosing a value for this option.
435 config PPC_SUBPAGE_PROT
436 bool "Support setting protections for 4k subpages"
437 depends on PPC_64K_PAGES
439 This option adds support for a system call to allow user programs
440 to set access permissions (read/write, readonly, or no access)
441 on the 4k subpages of each 64k page.
444 bool "SMT (Hyperthreading) scheduler support"
445 depends on PPC64 && SMP
447 SMT scheduler support improves the CPU scheduler's decision making
448 when dealing with POWER5 cpus at a cost of slightly increased
449 overhead in some places. If unsure say N here.
451 config PROC_DEVICETREE
452 bool "Support for device tree in /proc"
455 This option adds a device-tree directory under /proc which contains
456 an image of the device tree that the kernel copies from Open
457 Firmware or other boot firmware. If unsure, say Y here.
460 bool "Default bootloader kernel arguments"
463 string "Initial kernel command string"
464 depends on CMDLINE_BOOL
465 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
467 On some platforms, there is currently no way for the boot loader to
468 pass arguments to the kernel. For these platforms, you can supply
469 some command-line options at build time by entering them here. In
470 most cases you will need to specify the root device here.
473 string "Additional default image types"
475 List additional targets to be built by the bootwrapper here (separated
476 by spaces). This is useful for targets that depend of device tree
477 files in the .dts directory.
479 Targets in this list will be build as part of the default build
480 target, or when the user does a 'make zImage' or a
481 'make zImage.initrd'.
483 If unsure, leave blank
486 config ARCH_WANTS_FREEZER_CONTROL
490 source kernel/power/Kconfig
494 bool "Enable seccomp to safely compute untrusted bytecode"
498 This kernel feature is useful for number crunching applications
499 that may need to compute untrusted bytecode during their
500 execution. By using pipes or other transports made available to
501 the process as file descriptors supporting the read/write
502 syscalls, it's possible to isolate those applications in
503 their own address space using seccomp. Once seccomp is
504 enabled via /proc/<pid>/seccomp, it cannot be disabled
505 and the task is only allowed to execute a few safe syscalls
506 defined by each seccomp mode.
508 If unsure, say Y. Only embedded should say N here.
514 default !PPC_ISERIES || PCI
519 bool "Support for ISA-bus hardware"
520 depends on PPC_PREP || PPC_CHRP
523 Find out whether you have ISA slots on your motherboard. ISA is the
524 name of a bus system, i.e. the way the CPU talks to the other stuff
525 inside your box. If you have an Apple machine, say N here; if you
526 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
527 you have an embedded board, consult your board documentation.
533 config GENERIC_ISA_DMA
535 depends on PPC64 || POWER4 || 6xx && !CPM2
538 config PPC_INDIRECT_PCI
541 default y if 40x || 44x
555 select PPC_INDIRECT_PCI
563 Freescale Localbus support
567 depends on PPC_83xx || QUICC_ENGINE || CPM2
569 Freescale General-purpose Timers support
571 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
575 # Platforms that what PCI turned unconditionally just do select PCI
576 # in their config node. Platforms that want to choose at config
577 # time should select PPC_PCI_CHOICE
578 config PPC_PCI_CHOICE
582 bool "PCI support" if PPC_PCI_CHOICE
583 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
584 && !PPC_85xx && !PPC_86xx
585 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
586 default PCI_QSPAN if !4xx && !CPM2 && 8xx
587 select ARCH_SUPPORTS_MSI
589 Find out whether your system includes a PCI bus. PCI is the name of
590 a bus system, i.e. the way the CPU talks to the other stuff inside
591 your box. If you say Y here, the kernel will include drivers and
592 infrastructure code to support PCI bus devices.
602 depends on !4xx && !CPM2 && 8xx
605 Say Y here if you have a system based on a Motorola 8xx-series
606 embedded processor with a QSPAN PCI interface, otherwise say N.
610 depends on PCI && 8260
611 select PPC_INDIRECT_PCI
615 bool "Enable workaround for MPC826x erratum PCI 9"
616 depends on PCI_8260 && !8272
620 prompt "IDMA channel for PCI 9 workaround"
623 config 8260_PCI9_IDMA1
626 config 8260_PCI9_IDMA2
629 config 8260_PCI9_IDMA3
632 config 8260_PCI9_IDMA4
637 source "drivers/pci/pcie/Kconfig"
639 source "drivers/pci/Kconfig"
641 source "drivers/pcmcia/Kconfig"
643 source "drivers/pci/hotplug/Kconfig"
650 bool "RapidIO support"
651 depends on HAS_RAPIDIO
653 If you say Y here, the kernel will include drivers and
654 infrastructure code to support RapidIO interconnect devices.
656 source "drivers/rapidio/Kconfig"
660 menu "Advanced setup"
663 config ADVANCED_OPTIONS
664 bool "Prompt for advanced kernel configuration options"
666 This option will enable prompting for a variety of advanced kernel
667 configuration options. These options can cause the kernel to not
668 work if they are set incorrectly, but can be used to optimize certain
669 aspects of kernel memory management.
671 Unless you know what you are doing, say N here.
673 comment "Default settings for advanced configuration options are used"
674 depends on !ADVANCED_OPTIONS
676 config LOWMEM_SIZE_BOOL
677 bool "Set maximum low memory"
678 depends on ADVANCED_OPTIONS
680 This option allows you to set the maximum amount of memory which
681 will be used as "low memory", that is, memory which the kernel can
682 access directly, without having to set up a kernel virtual mapping.
683 This can be useful in optimizing the layout of kernel virtual
686 Say N here unless you know what you are doing.
689 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
693 bool "Build a relocatable kernel (EXPERIMENTAL)"
694 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
696 This builds a kernel image that is capable of running at the
697 location the kernel is loaded at (some alignment restrictions may
700 One use is for the kexec on panic case where the recovery kernel
701 must live at a different physical address than the primary
704 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
705 it has been loaded at and the compile time physical addresses
706 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
707 setting can still be useful to bootwrappers that need to know the
708 load location of the kernel (eg. u-boot/mkimage).
710 config PAGE_OFFSET_BOOL
711 bool "Set custom page offset address"
712 depends on ADVANCED_OPTIONS
714 This option allows you to set the kernel virtual address at which
715 the kernel will map low memory. This can be useful in optimizing
716 the virtual memory layout of the system.
718 Say N here unless you know what you are doing.
721 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
724 config KERNEL_START_BOOL
725 bool "Set custom kernel base address"
726 depends on ADVANCED_OPTIONS
728 This option allows you to set the kernel virtual address at which
729 the kernel will be loaded. Normally this should match PAGE_OFFSET
730 however there are times (like kdump) that one might not want them
733 Say N here unless you know what you are doing.
736 hex "Virtual address of kernel base" if KERNEL_START_BOOL
737 default PAGE_OFFSET if PAGE_OFFSET_BOOL
738 default "0xc2000000" if CRASH_DUMP
741 config PHYSICAL_START_BOOL
742 bool "Set physical address where the kernel is loaded"
743 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
745 This gives the physical address where the kernel is loaded.
747 Say N here unless you know what you are doing.
749 config PHYSICAL_START
750 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
751 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
754 config PHYSICAL_ALIGN
756 default "0x10000000" if FSL_BOOKE
758 This value puts the alignment restrictions on physical address
759 where kernel is loaded and run from. Kernel is compiled for an
760 address which meets above alignment restriction.
762 config TASK_SIZE_BOOL
763 bool "Set custom user task size"
764 depends on ADVANCED_OPTIONS
766 This option allows you to set the amount of virtual address space
767 allocated to user tasks. This can be useful in optimizing the
768 virtual memory layout of the system.
770 Say N here unless you know what you are doing.
773 hex "Size of user task space" if TASK_SIZE_BOOL
774 default "0x80000000" if PPC_PREP || PPC_8xx
777 config CONSISTENT_START_BOOL
778 bool "Set custom consistent memory pool address"
779 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
781 This option allows you to set the base virtual address
782 of the consistent memory pool. This pool of virtual
783 memory is used to make consistent memory allocations.
785 config CONSISTENT_START
786 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
787 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
788 default "0xff100000" if NOT_COHERENT_CACHE
790 config CONSISTENT_SIZE_BOOL
791 bool "Set custom consistent memory pool size"
792 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
794 This option allows you to set the size of the
795 consistent memory pool. This pool of virtual memory
796 is used to make consistent memory allocations.
798 config CONSISTENT_SIZE
799 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
800 default "0x00200000" if NOT_COHERENT_CACHE
803 bool "Pinned Kernel TLBs (860 ONLY)"
804 depends on ADVANCED_OPTIONS && 8xx
810 default "0xc000000000000000"
813 default "0xc000000002000000" if CRASH_DUMP
814 default "0xc000000000000000"
815 config PHYSICAL_START
817 default "0x02000000" if CRASH_DUMP
823 source "drivers/Kconfig"
827 # XXX source "arch/ppc/8xx_io/Kconfig"
829 # XXX source "arch/ppc/8260_io/Kconfig"
831 source "arch/powerpc/sysdev/qe_lib/Kconfig"
835 source "arch/powerpc/Kconfig.debug"
837 source "security/Kconfig"
841 depends on COMPAT && KEYS
844 source "crypto/Kconfig"
854 source "arch/powerpc/kvm/Kconfig"