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
120 select HAVE_ARCH_TRACEHOOK
122 select HAVE_DMA_ATTRS if PPC64
123 select USE_GENERIC_SMP_HELPERS if SMP
133 select COMPAT_BINFMT_ELF
135 config SYSVIPC_COMPAT
137 depends on COMPAT && SYSVIPC
140 # All PPC32s use generic nvram driver through ppc_md
145 config SCHED_NO_NO_OMIT_FRAME_POINTER
149 config ARCH_MAY_HAVE_PC_FDC
151 default !PPC_PSERIES || PCI
159 config PPC_UDBG_16550
163 config GENERIC_TBSYNC
165 default y if PPC32 && SMP
177 config SYS_SUPPORTS_APM_EMULATION
178 default y if PMAC_APM_EMU
181 config DEFAULT_UIMAGE
184 Used to allow a board to specify it wants a uImage built by default
192 depends on (PPC_PMAC && !SMP) || BROKEN
197 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
200 config ARCH_HIBERNATION_POSSIBLE
202 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
205 config ARCH_SUSPEND_POSSIBLE
207 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
209 config PPC_DCR_NATIVE
219 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
222 config PPC_OF_PLATFORM_PCI
225 depends on PPC64 # not supported on 32 bits yet
228 source "init/Kconfig"
230 source "arch/powerpc/sysdev/Kconfig"
231 source "arch/powerpc/platforms/Kconfig"
233 menu "Kernel options"
236 bool "High memory support"
239 source kernel/time/Kconfig
240 source kernel/Kconfig.hz
241 source kernel/Kconfig.preempt
242 source "fs/Kconfig.binfmt"
244 config HUGETLB_PAGE_SIZE_VARIABLE
246 depends on HUGETLB_PAGE
249 config MATH_EMULATION
250 bool "Math emulation"
251 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
253 Some PowerPC chips designed for embedded applications do not have
254 a floating-point unit and therefore do not implement the
255 floating-point instructions in the PowerPC instruction set. If you
256 say Y here, the kernel will include code to emulate a floating-point
257 unit, which will allow programs that use floating-point
260 config 8XX_MINIMAL_FPEMU
261 bool "Minimal math emulation for 8xx"
262 depends on 8xx && !MATH_EMULATION
264 Older arch/ppc kernels still emulated a few floating point
265 instructions such as load and store, even when full math
266 emulation is disabled. Say "Y" here if you want to preserve
269 It is recommended that you build a soft-float userspace instead.
272 bool "Enable IOMMU virtual merging"
276 Cause IO segments sent to a device for DMA to be merged virtually
277 by the IOMMU when they happen to have been allocated contiguously.
278 This doesn't add pressure to the IOMMU allocator. However, some
279 drivers don't support getting large merged segments coming back
282 Most drivers don't have this problem; it is safe to say Y here.
288 bool "Support for enabling/disabling CPUs"
289 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
291 Say Y here to be able to disable and re-enable individual
292 CPUs at runtime on SMP machines.
294 Say N if you are unsure.
296 config ARCH_ENABLE_MEMORY_HOTPLUG
299 config ARCH_HAS_WALK_MEMORY
302 config ARCH_ENABLE_MEMORY_HOTREMOVE
306 bool "kexec system call (EXPERIMENTAL)"
307 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
309 kexec is a system call that implements the ability to shutdown your
310 current kernel, and to start another kernel. It is like a reboot
311 but it is independent of the system firmware. And like a reboot
312 you can start any kernel with it, not just Linux.
314 The name comes from the similarity to the exec system call.
316 It is an ongoing process to be certain the hardware in a machine
317 is properly shutdown, so do not be surprised if this code does not
318 initially work for you. It may help to enable device hotplugging
319 support. As of this writing the exact hardware interface is
320 strongly in flux, so no good recommendation can be made.
323 bool "Build a kdump crash kernel"
324 depends on PPC_MULTIPLATFORM && PPC64
326 Build a kernel suitable for use as a kdump capture kernel.
327 The kernel will be linked at a different address than normal, and
328 so can only be used for Kdump.
330 Don't change this unless you know what you are doing.
333 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
334 depends on PPC_PSERIES && EXPERIMENTAL
336 Hypervisor-assisted dump is meant to be a kdump replacement
337 offering robustness and speed not possible without system
338 hypervisor assistence.
343 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
344 default y if PPC_PREP
347 bool "Distribute interrupts on all CPUs by default"
348 depends on SMP && !MV64360
350 This option gives the kernel permission to distribute IRQs across
351 multiple CPUs. Saying N here will route all IRQs to the first
352 CPU. Generally saying Y is safe, although some problems have been
353 reported with SMP Power Macintoshes with this option enabled.
358 default y if SMP && PPC_PSERIES
363 depends on NEED_MULTIPLE_NODES
365 config ARCH_SELECT_MEMORY_MODEL
369 config ARCH_FLATMEM_ENABLE
371 depends on (PPC64 && !NUMA) || PPC32
373 config ARCH_SPARSEMEM_ENABLE
376 select SPARSEMEM_VMEMMAP_ENABLE
378 config ARCH_SPARSEMEM_DEFAULT
380 depends on (SMP && PPC_PSERIES) || PPC_PS3
382 config ARCH_POPULATES_NODE_MAP
387 config ARCH_MEMORY_PROBE
389 depends on MEMORY_HOTPLUG
391 # Some NUMA nodes have memory ranges that span
392 # other nodes. Even though a pfn is valid and
393 # between a node's start and end pfns, it may not
394 # reside on that node. See memmap_init_zone()
396 config NODES_SPAN_OTHER_NODES
398 depends on NEED_MULTIPLE_NODES
400 config PPC_HAS_HASH_64K
408 select PPC_HAS_HASH_64K
410 This option changes the kernel logical page size to 64k. On machines
411 without processor support for 64k pages, the kernel will simulate
412 them by loading each individual 4k page on demand transparently,
413 while on hardware with such support, it will be used to map
414 normal application pages.
416 config FORCE_MAX_ZONEORDER
417 int "Maximum zone order"
418 default "9" if PPC_64K_PAGES
419 default "13" if PPC64 && !PPC_64K_PAGES
422 The kernel memory allocator divides physically contiguous memory
423 blocks into "zones", where each zone is a power of two number of
424 pages. This option selects the largest power of two that the kernel
425 keeps in the memory allocator. If you need to allocate very large
426 blocks of physically contiguous memory, then you may need to
429 This config option is actually maximum order plus one. For example,
430 a value of 11 means that the largest free memory block is 2^10 pages.
432 The page size is not necessarily 4KB. For example, on 64-bit
433 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
434 this in mind when choosing a value for this option.
436 config PPC_SUBPAGE_PROT
437 bool "Support setting protections for 4k subpages"
438 depends on PPC_64K_PAGES
440 This option adds support for a system call to allow user programs
441 to set access permissions (read/write, readonly, or no access)
442 on the 4k subpages of each 64k page.
445 bool "SMT (Hyperthreading) scheduler support"
446 depends on PPC64 && SMP
448 SMT scheduler support improves the CPU scheduler's decision making
449 when dealing with POWER5 cpus at a cost of slightly increased
450 overhead in some places. If unsure say N here.
452 config PROC_DEVICETREE
453 bool "Support for device tree in /proc"
456 This option adds a device-tree directory under /proc which contains
457 an image of the device tree that the kernel copies from Open
458 Firmware or other boot firmware. If unsure, say Y here.
461 bool "Default bootloader kernel arguments"
464 string "Initial kernel command string"
465 depends on CMDLINE_BOOL
466 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
468 On some platforms, there is currently no way for the boot loader to
469 pass arguments to the kernel. For these platforms, you can supply
470 some command-line options at build time by entering them here. In
471 most cases you will need to specify the root device here.
474 string "Additional default image types"
476 List additional targets to be built by the bootwrapper here (separated
477 by spaces). This is useful for targets that depend of device tree
478 files in the .dts directory.
480 Targets in this list will be build as part of the default build
481 target, or when the user does a 'make zImage' or a
482 'make zImage.initrd'.
484 If unsure, leave blank
487 config ARCH_WANTS_FREEZER_CONTROL
491 source kernel/power/Kconfig
495 bool "Enable seccomp to safely compute untrusted bytecode"
499 This kernel feature is useful for number crunching applications
500 that may need to compute untrusted bytecode during their
501 execution. By using pipes or other transports made available to
502 the process as file descriptors supporting the read/write
503 syscalls, it's possible to isolate those applications in
504 their own address space using seccomp. Once seccomp is
505 enabled via /proc/<pid>/seccomp, it cannot be disabled
506 and the task is only allowed to execute a few safe syscalls
507 defined by each seccomp mode.
509 If unsure, say Y. Only embedded should say N here.
515 default !PPC_ISERIES || PCI
520 bool "Support for ISA-bus hardware"
521 depends on PPC_PREP || PPC_CHRP
524 Find out whether you have ISA slots on your motherboard. ISA is the
525 name of a bus system, i.e. the way the CPU talks to the other stuff
526 inside your box. If you have an Apple machine, say N here; if you
527 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
528 you have an embedded board, consult your board documentation.
534 config GENERIC_ISA_DMA
536 depends on PPC64 || POWER4 || 6xx && !CPM2
539 config PPC_INDIRECT_PCI
542 default y if 40x || 44x
556 select PPC_INDIRECT_PCI
564 Freescale Localbus support
568 depends on PPC_83xx || QUICC_ENGINE || CPM2
570 Freescale General-purpose Timers support
572 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
576 # Platforms that what PCI turned unconditionally just do select PCI
577 # in their config node. Platforms that want to choose at config
578 # time should select PPC_PCI_CHOICE
579 config PPC_PCI_CHOICE
583 bool "PCI support" if PPC_PCI_CHOICE
584 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
585 && !PPC_85xx && !PPC_86xx
586 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
587 default PCI_QSPAN if !4xx && !CPM2 && 8xx
588 select ARCH_SUPPORTS_MSI
590 Find out whether your system includes a PCI bus. PCI is the name of
591 a bus system, i.e. the way the CPU talks to the other stuff inside
592 your box. If you say Y here, the kernel will include drivers and
593 infrastructure code to support PCI bus devices.
603 depends on !4xx && !CPM2 && 8xx
606 Say Y here if you have a system based on a Motorola 8xx-series
607 embedded processor with a QSPAN PCI interface, otherwise say N.
611 depends on PCI && 8260
612 select PPC_INDIRECT_PCI
616 bool "Enable workaround for MPC826x erratum PCI 9"
617 depends on PCI_8260 && !8272
621 prompt "IDMA channel for PCI 9 workaround"
624 config 8260_PCI9_IDMA1
627 config 8260_PCI9_IDMA2
630 config 8260_PCI9_IDMA3
633 config 8260_PCI9_IDMA4
638 source "drivers/pci/pcie/Kconfig"
640 source "drivers/pci/Kconfig"
642 source "drivers/pcmcia/Kconfig"
644 source "drivers/pci/hotplug/Kconfig"
651 bool "RapidIO support"
652 depends on HAS_RAPIDIO
654 If you say Y here, the kernel will include drivers and
655 infrastructure code to support RapidIO interconnect devices.
657 source "drivers/rapidio/Kconfig"
661 menu "Advanced setup"
664 config ADVANCED_OPTIONS
665 bool "Prompt for advanced kernel configuration options"
667 This option will enable prompting for a variety of advanced kernel
668 configuration options. These options can cause the kernel to not
669 work if they are set incorrectly, but can be used to optimize certain
670 aspects of kernel memory management.
672 Unless you know what you are doing, say N here.
674 comment "Default settings for advanced configuration options are used"
675 depends on !ADVANCED_OPTIONS
677 config LOWMEM_SIZE_BOOL
678 bool "Set maximum low memory"
679 depends on ADVANCED_OPTIONS
681 This option allows you to set the maximum amount of memory which
682 will be used as "low memory", that is, memory which the kernel can
683 access directly, without having to set up a kernel virtual mapping.
684 This can be useful in optimizing the layout of kernel virtual
687 Say N here unless you know what you are doing.
690 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
694 bool "Build a relocatable kernel (EXPERIMENTAL)"
695 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
697 This builds a kernel image that is capable of running at the
698 location the kernel is loaded at (some alignment restrictions may
701 One use is for the kexec on panic case where the recovery kernel
702 must live at a different physical address than the primary
705 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
706 it has been loaded at and the compile time physical addresses
707 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
708 setting can still be useful to bootwrappers that need to know the
709 load location of the kernel (eg. u-boot/mkimage).
711 config PAGE_OFFSET_BOOL
712 bool "Set custom page offset address"
713 depends on ADVANCED_OPTIONS
715 This option allows you to set the kernel virtual address at which
716 the kernel will map low memory. This can be useful in optimizing
717 the virtual memory layout of the system.
719 Say N here unless you know what you are doing.
722 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
725 config KERNEL_START_BOOL
726 bool "Set custom kernel base address"
727 depends on ADVANCED_OPTIONS
729 This option allows you to set the kernel virtual address at which
730 the kernel will be loaded. Normally this should match PAGE_OFFSET
731 however there are times (like kdump) that one might not want them
734 Say N here unless you know what you are doing.
737 hex "Virtual address of kernel base" if KERNEL_START_BOOL
738 default PAGE_OFFSET if PAGE_OFFSET_BOOL
739 default "0xc2000000" if CRASH_DUMP
742 config PHYSICAL_START_BOOL
743 bool "Set physical address where the kernel is loaded"
744 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
746 This gives the physical address where the kernel is loaded.
748 Say N here unless you know what you are doing.
750 config PHYSICAL_START
751 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
752 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
755 config PHYSICAL_ALIGN
757 default "0x10000000" if FSL_BOOKE
759 This value puts the alignment restrictions on physical address
760 where kernel is loaded and run from. Kernel is compiled for an
761 address which meets above alignment restriction.
763 config TASK_SIZE_BOOL
764 bool "Set custom user task size"
765 depends on ADVANCED_OPTIONS
767 This option allows you to set the amount of virtual address space
768 allocated to user tasks. This can be useful in optimizing the
769 virtual memory layout of the system.
771 Say N here unless you know what you are doing.
774 hex "Size of user task space" if TASK_SIZE_BOOL
775 default "0x80000000" if PPC_PREP || PPC_8xx
778 config CONSISTENT_START_BOOL
779 bool "Set custom consistent memory pool address"
780 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
782 This option allows you to set the base virtual address
783 of the consistent memory pool. This pool of virtual
784 memory is used to make consistent memory allocations.
786 config CONSISTENT_START
787 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
788 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
789 default "0xff100000" if NOT_COHERENT_CACHE
791 config CONSISTENT_SIZE_BOOL
792 bool "Set custom consistent memory pool size"
793 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
795 This option allows you to set the size of the
796 consistent memory pool. This pool of virtual memory
797 is used to make consistent memory allocations.
799 config CONSISTENT_SIZE
800 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
801 default "0x00200000" if NOT_COHERENT_CACHE
804 bool "Pinned Kernel TLBs (860 ONLY)"
805 depends on ADVANCED_OPTIONS && 8xx
810 bool "Build a relocatable kernel"
812 This builds a kernel image that is capable of running anywhere
813 in the RMA (real memory area) at any 16k-aligned base address.
814 The kernel is linked as a position-independent executable (PIE)
815 and contains dynamic relocations which are processed early
816 in the bootup process.
818 One use is for the kexec on panic case where the recovery kernel
819 must live at a different physical address than the primary
824 default "0xc000000000000000"
827 default "0xc000000002000000" if CRASH_DUMP
828 default "0xc000000000000000"
829 config PHYSICAL_START
831 default "0x02000000" if CRASH_DUMP
837 source "drivers/Kconfig"
841 # XXX source "arch/ppc/8xx_io/Kconfig"
843 # XXX source "arch/ppc/8260_io/Kconfig"
845 source "arch/powerpc/sysdev/qe_lib/Kconfig"
849 source "arch/powerpc/Kconfig.debug"
851 source "security/Kconfig"
855 depends on COMPAT && KEYS
858 source "crypto/Kconfig"
868 source "arch/powerpc/kvm/Kconfig"