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"
25 config ARCH_PHYS_ADDR_T_64BIT
26 def_bool PPC64 || PHYS_64BIT
32 config GENERIC_CMOS_UPDATE
38 config GENERIC_TIME_VSYSCALL
41 config GENERIC_CLOCKEVENTS
44 config GENERIC_HARDIRQS
48 config HAVE_SETUP_PER_CPU_AREA
55 config STACKTRACE_SUPPORT
59 config HAVE_LATENCYTOP_SUPPORT
62 config TRACE_IRQFLAGS_SUPPORT
67 config LOCKDEP_SUPPORT
71 config RWSEM_GENERIC_SPINLOCK
74 config RWSEM_XCHGADD_ALGORITHM
78 config GENERIC_LOCKBREAK
81 depends on SMP && PREEMPT
83 config ARCH_HAS_ILOG2_U32
87 config ARCH_HAS_ILOG2_U64
91 config GENERIC_HWEIGHT
95 config GENERIC_CALIBRATE_DELAY
99 config GENERIC_FIND_NEXT_BIT
106 Generic GPIO API support
108 config ARCH_NO_VIRT_TO_BUS
114 select HAVE_FUNCTION_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
135 select COMPAT_BINFMT_ELF
137 config SYSVIPC_COMPAT
139 depends on COMPAT && SYSVIPC
142 # All PPC32s use generic nvram driver through ppc_md
147 config SCHED_NO_NO_OMIT_FRAME_POINTER
151 config ARCH_MAY_HAVE_PC_FDC
153 default !PPC_PSERIES || PCI
161 config PPC_UDBG_16550
165 config GENERIC_TBSYNC
167 default y if PPC32 && SMP
179 config SYS_SUPPORTS_APM_EMULATION
180 default y if PMAC_APM_EMU
183 config DEFAULT_UIMAGE
186 Used to allow a board to specify it wants a uImage built by default
194 depends on (PPC_PMAC && !SMP) || BROKEN
199 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
202 config ARCH_HIBERNATION_POSSIBLE
204 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
207 config ARCH_SUSPEND_POSSIBLE
209 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
211 config PPC_DCR_NATIVE
221 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
224 config PPC_OF_PLATFORM_PCI
227 depends on PPC64 # not supported on 32 bits yet
230 source "init/Kconfig"
232 source "kernel/Kconfig.freezer"
234 source "arch/powerpc/sysdev/Kconfig"
235 source "arch/powerpc/platforms/Kconfig"
237 menu "Kernel options"
240 bool "High memory support"
243 source kernel/time/Kconfig
244 source kernel/Kconfig.hz
245 source kernel/Kconfig.preempt
246 source "fs/Kconfig.binfmt"
248 config HUGETLB_PAGE_SIZE_VARIABLE
250 depends on HUGETLB_PAGE
253 config MATH_EMULATION
254 bool "Math emulation"
255 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
257 Some PowerPC chips designed for embedded applications do not have
258 a floating-point unit and therefore do not implement the
259 floating-point instructions in the PowerPC instruction set. If you
260 say Y here, the kernel will include code to emulate a floating-point
261 unit, which will allow programs that use floating-point
264 config 8XX_MINIMAL_FPEMU
265 bool "Minimal math emulation for 8xx"
266 depends on 8xx && !MATH_EMULATION
268 Older arch/ppc kernels still emulated a few floating point
269 instructions such as load and store, even when full math
270 emulation is disabled. Say "Y" here if you want to preserve
273 It is recommended that you build a soft-float userspace instead.
276 bool "Enable IOMMU virtual merging"
280 Cause IO segments sent to a device for DMA to be merged virtually
281 by the IOMMU when they happen to have been allocated contiguously.
282 This doesn't add pressure to the IOMMU allocator. However, some
283 drivers don't support getting large merged segments coming back
286 Most drivers don't have this problem; it is safe to say Y here.
292 bool "Support for enabling/disabling CPUs"
293 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
295 Say Y here to be able to disable and re-enable individual
296 CPUs at runtime on SMP machines.
298 Say N if you are unsure.
300 config ARCH_ENABLE_MEMORY_HOTPLUG
303 config ARCH_HAS_WALK_MEMORY
306 config ARCH_ENABLE_MEMORY_HOTREMOVE
310 bool "kexec system call (EXPERIMENTAL)"
311 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
313 kexec is a system call that implements the ability to shutdown your
314 current kernel, and to start another kernel. It is like a reboot
315 but it is independent of the system firmware. And like a reboot
316 you can start any kernel with it, not just Linux.
318 The name comes from the similarity to the exec system call.
320 It is an ongoing process to be certain the hardware in a machine
321 is properly shutdown, so do not be surprised if this code does not
322 initially work for you. It may help to enable device hotplugging
323 support. As of this writing the exact hardware interface is
324 strongly in flux, so no good recommendation can be made.
327 bool "Build a kdump crash kernel"
328 depends on PPC_MULTIPLATFORM && PPC64
330 Build a kernel suitable for use as a kdump capture kernel.
331 The kernel will be linked at a different address than normal, and
332 so can only be used for Kdump.
334 Don't change this unless you know what you are doing.
337 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
338 depends on PPC_PSERIES && EXPERIMENTAL
340 Hypervisor-assisted dump is meant to be a kdump replacement
341 offering robustness and speed not possible without system
342 hypervisor assistence.
347 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
348 default y if PPC_PREP
351 bool "Distribute interrupts on all CPUs by default"
352 depends on SMP && !MV64360
354 This option gives the kernel permission to distribute IRQs across
355 multiple CPUs. Saying N here will route all IRQs to the first
356 CPU. Generally saying Y is safe, although some problems have been
357 reported with SMP Power Macintoshes with this option enabled.
362 default y if SMP && PPC_PSERIES
367 depends on NEED_MULTIPLE_NODES
369 config ARCH_SELECT_MEMORY_MODEL
373 config ARCH_FLATMEM_ENABLE
375 depends on (PPC64 && !NUMA) || PPC32
377 config ARCH_SPARSEMEM_ENABLE
380 select SPARSEMEM_VMEMMAP_ENABLE
382 config ARCH_SPARSEMEM_DEFAULT
384 depends on (SMP && PPC_PSERIES) || PPC_PS3
386 config ARCH_POPULATES_NODE_MAP
391 config ARCH_MEMORY_PROBE
393 depends on MEMORY_HOTPLUG
395 # Some NUMA nodes have memory ranges that span
396 # other nodes. Even though a pfn is valid and
397 # between a node's start and end pfns, it may not
398 # reside on that node. See memmap_init_zone()
400 config NODES_SPAN_OTHER_NODES
402 depends on NEED_MULTIPLE_NODES
404 config PPC_HAS_HASH_64K
412 select PPC_HAS_HASH_64K
414 This option changes the kernel logical page size to 64k. On machines
415 without processor support for 64k pages, the kernel will simulate
416 them by loading each individual 4k page on demand transparently,
417 while on hardware with such support, it will be used to map
418 normal application pages.
420 config FORCE_MAX_ZONEORDER
421 int "Maximum zone order"
422 range 9 64 if PPC_64K_PAGES
423 default "9" if PPC_64K_PAGES
424 range 13 64 if PPC64 && !PPC_64K_PAGES
425 default "13" if PPC64 && !PPC_64K_PAGES
429 The kernel memory allocator divides physically contiguous memory
430 blocks into "zones", where each zone is a power of two number of
431 pages. This option selects the largest power of two that the kernel
432 keeps in the memory allocator. If you need to allocate very large
433 blocks of physically contiguous memory, then you may need to
436 This config option is actually maximum order plus one. For example,
437 a value of 11 means that the largest free memory block is 2^10 pages.
439 The page size is not necessarily 4KB. For example, on 64-bit
440 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
441 this in mind when choosing a value for this option.
443 config PPC_SUBPAGE_PROT
444 bool "Support setting protections for 4k subpages"
445 depends on PPC_64K_PAGES
447 This option adds support for a system call to allow user programs
448 to set access permissions (read/write, readonly, or no access)
449 on the 4k subpages of each 64k page.
452 bool "SMT (Hyperthreading) scheduler support"
453 depends on PPC64 && SMP
455 SMT scheduler support improves the CPU scheduler's decision making
456 when dealing with POWER5 cpus at a cost of slightly increased
457 overhead in some places. If unsure say N here.
459 config PROC_DEVICETREE
460 bool "Support for device tree in /proc"
463 This option adds a device-tree directory under /proc which contains
464 an image of the device tree that the kernel copies from Open
465 Firmware or other boot firmware. If unsure, say Y here.
468 bool "Default bootloader kernel arguments"
471 string "Initial kernel command string"
472 depends on CMDLINE_BOOL
473 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
475 On some platforms, there is currently no way for the boot loader to
476 pass arguments to the kernel. For these platforms, you can supply
477 some command-line options at build time by entering them here. In
478 most cases you will need to specify the root device here.
481 string "Additional default image types"
483 List additional targets to be built by the bootwrapper here (separated
484 by spaces). This is useful for targets that depend of device tree
485 files in the .dts directory.
487 Targets in this list will be build as part of the default build
488 target, or when the user does a 'make zImage' or a
489 'make zImage.initrd'.
491 If unsure, leave blank
494 config ARCH_WANTS_FREEZER_CONTROL
498 source kernel/power/Kconfig
502 bool "Enable seccomp to safely compute untrusted bytecode"
506 This kernel feature is useful for number crunching applications
507 that may need to compute untrusted bytecode during their
508 execution. By using pipes or other transports made available to
509 the process as file descriptors supporting the read/write
510 syscalls, it's possible to isolate those applications in
511 their own address space using seccomp. Once seccomp is
512 enabled via /proc/<pid>/seccomp, it cannot be disabled
513 and the task is only allowed to execute a few safe syscalls
514 defined by each seccomp mode.
516 If unsure, say Y. Only embedded should say N here.
522 default !PPC_ISERIES || PCI
527 bool "Support for ISA-bus hardware"
528 depends on PPC_PREP || PPC_CHRP
531 Find out whether you have ISA slots on your motherboard. ISA is the
532 name of a bus system, i.e. the way the CPU talks to the other stuff
533 inside your box. If you have an Apple machine, say N here; if you
534 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
535 you have an embedded board, consult your board documentation.
541 config GENERIC_ISA_DMA
543 depends on PPC64 || POWER4 || 6xx && !CPM2
546 config PPC_INDIRECT_PCI
549 default y if 40x || 44x
563 select PPC_INDIRECT_PCI
571 Freescale Localbus support
575 depends on PPC_83xx || QUICC_ENGINE || CPM2
577 Freescale General-purpose Timers support
579 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
583 # Platforms that what PCI turned unconditionally just do select PCI
584 # in their config node. Platforms that want to choose at config
585 # time should select PPC_PCI_CHOICE
586 config PPC_PCI_CHOICE
590 bool "PCI support" if PPC_PCI_CHOICE
591 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
592 && !PPC_85xx && !PPC_86xx
593 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
594 default PCI_QSPAN if !4xx && !CPM2 && 8xx
595 select ARCH_SUPPORTS_MSI
597 Find out whether your system includes a PCI bus. PCI is the name of
598 a bus system, i.e. the way the CPU talks to the other stuff inside
599 your box. If you say Y here, the kernel will include drivers and
600 infrastructure code to support PCI bus devices.
610 depends on !4xx && !CPM2 && 8xx
613 Say Y here if you have a system based on a Motorola 8xx-series
614 embedded processor with a QSPAN PCI interface, otherwise say N.
618 depends on PCI && 8260
619 select PPC_INDIRECT_PCI
623 bool "Enable workaround for MPC826x erratum PCI 9"
624 depends on PCI_8260 && !8272
628 prompt "IDMA channel for PCI 9 workaround"
631 config 8260_PCI9_IDMA1
634 config 8260_PCI9_IDMA2
637 config 8260_PCI9_IDMA3
640 config 8260_PCI9_IDMA4
645 source "drivers/pci/pcie/Kconfig"
647 source "drivers/pci/Kconfig"
649 source "drivers/pcmcia/Kconfig"
651 source "drivers/pci/hotplug/Kconfig"
658 bool "RapidIO support"
659 depends on HAS_RAPIDIO
661 If you say Y here, the kernel will include drivers and
662 infrastructure code to support RapidIO interconnect devices.
664 source "drivers/rapidio/Kconfig"
668 menu "Advanced setup"
671 config ADVANCED_OPTIONS
672 bool "Prompt for advanced kernel configuration options"
674 This option will enable prompting for a variety of advanced kernel
675 configuration options. These options can cause the kernel to not
676 work if they are set incorrectly, but can be used to optimize certain
677 aspects of kernel memory management.
679 Unless you know what you are doing, say N here.
681 comment "Default settings for advanced configuration options are used"
682 depends on !ADVANCED_OPTIONS
684 config LOWMEM_SIZE_BOOL
685 bool "Set maximum low memory"
686 depends on ADVANCED_OPTIONS
688 This option allows you to set the maximum amount of memory which
689 will be used as "low memory", that is, memory which the kernel can
690 access directly, without having to set up a kernel virtual mapping.
691 This can be useful in optimizing the layout of kernel virtual
694 Say N here unless you know what you are doing.
697 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
701 bool "Build a relocatable kernel (EXPERIMENTAL)"
702 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
704 This builds a kernel image that is capable of running at the
705 location the kernel is loaded at (some alignment restrictions may
708 One use is for the kexec on panic case where the recovery kernel
709 must live at a different physical address than the primary
712 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
713 it has been loaded at and the compile time physical addresses
714 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
715 setting can still be useful to bootwrappers that need to know the
716 load location of the kernel (eg. u-boot/mkimage).
718 config PAGE_OFFSET_BOOL
719 bool "Set custom page offset address"
720 depends on ADVANCED_OPTIONS
722 This option allows you to set the kernel virtual address at which
723 the kernel will map low memory. This can be useful in optimizing
724 the virtual memory layout of the system.
726 Say N here unless you know what you are doing.
729 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
732 config KERNEL_START_BOOL
733 bool "Set custom kernel base address"
734 depends on ADVANCED_OPTIONS
736 This option allows you to set the kernel virtual address at which
737 the kernel will be loaded. Normally this should match PAGE_OFFSET
738 however there are times (like kdump) that one might not want them
741 Say N here unless you know what you are doing.
744 hex "Virtual address of kernel base" if KERNEL_START_BOOL
745 default PAGE_OFFSET if PAGE_OFFSET_BOOL
746 default "0xc2000000" if CRASH_DUMP
749 config PHYSICAL_START_BOOL
750 bool "Set physical address where the kernel is loaded"
751 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
753 This gives the physical address where the kernel is loaded.
755 Say N here unless you know what you are doing.
757 config PHYSICAL_START
758 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
759 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
762 config PHYSICAL_ALIGN
764 default "0x10000000" if FSL_BOOKE
766 This value puts the alignment restrictions on physical address
767 where kernel is loaded and run from. Kernel is compiled for an
768 address which meets above alignment restriction.
770 config TASK_SIZE_BOOL
771 bool "Set custom user task size"
772 depends on ADVANCED_OPTIONS
774 This option allows you to set the amount of virtual address space
775 allocated to user tasks. This can be useful in optimizing the
776 virtual memory layout of the system.
778 Say N here unless you know what you are doing.
781 hex "Size of user task space" if TASK_SIZE_BOOL
782 default "0x80000000" if PPC_PREP || PPC_8xx
785 config CONSISTENT_START_BOOL
786 bool "Set custom consistent memory pool address"
787 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
789 This option allows you to set the base virtual address
790 of the consistent memory pool. This pool of virtual
791 memory is used to make consistent memory allocations.
793 config CONSISTENT_START
794 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
795 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
796 default "0xff100000" if NOT_COHERENT_CACHE
798 config CONSISTENT_SIZE_BOOL
799 bool "Set custom consistent memory pool size"
800 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
802 This option allows you to set the size of the
803 consistent memory pool. This pool of virtual memory
804 is used to make consistent memory allocations.
806 config CONSISTENT_SIZE
807 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
808 default "0x00200000" if NOT_COHERENT_CACHE
811 bool "Pinned Kernel TLBs (860 ONLY)"
812 depends on ADVANCED_OPTIONS && 8xx
817 bool "Build a relocatable kernel"
819 This builds a kernel image that is capable of running anywhere
820 in the RMA (real memory area) at any 16k-aligned base address.
821 The kernel is linked as a position-independent executable (PIE)
822 and contains dynamic relocations which are processed early
823 in the bootup process.
825 One use is for the kexec on panic case where the recovery kernel
826 must live at a different physical address than the primary
831 default "0xc000000000000000"
834 default "0xc000000002000000" if CRASH_DUMP
835 default "0xc000000000000000"
836 config PHYSICAL_START
838 default "0x02000000" if CRASH_DUMP
844 source "drivers/Kconfig"
848 # XXX source "arch/ppc/8xx_io/Kconfig"
850 # XXX source "arch/ppc/8260_io/Kconfig"
852 source "arch/powerpc/sysdev/qe_lib/Kconfig"
856 source "arch/powerpc/Kconfig.debug"
858 source "security/Kconfig"
862 depends on COMPAT && KEYS
865 source "crypto/Kconfig"
875 source "arch/powerpc/kvm/Kconfig"