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_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 "kernel/Kconfig.freezer"
232 source "arch/powerpc/sysdev/Kconfig"
233 source "arch/powerpc/platforms/Kconfig"
235 menu "Kernel options"
238 bool "High memory support"
241 source kernel/time/Kconfig
242 source kernel/Kconfig.hz
243 source kernel/Kconfig.preempt
244 source "fs/Kconfig.binfmt"
246 config HUGETLB_PAGE_SIZE_VARIABLE
248 depends on HUGETLB_PAGE
251 config MATH_EMULATION
252 bool "Math emulation"
253 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
255 Some PowerPC chips designed for embedded applications do not have
256 a floating-point unit and therefore do not implement the
257 floating-point instructions in the PowerPC instruction set. If you
258 say Y here, the kernel will include code to emulate a floating-point
259 unit, which will allow programs that use floating-point
262 config 8XX_MINIMAL_FPEMU
263 bool "Minimal math emulation for 8xx"
264 depends on 8xx && !MATH_EMULATION
266 Older arch/ppc kernels still emulated a few floating point
267 instructions such as load and store, even when full math
268 emulation is disabled. Say "Y" here if you want to preserve
271 It is recommended that you build a soft-float userspace instead.
274 bool "Enable IOMMU virtual merging"
278 Cause IO segments sent to a device for DMA to be merged virtually
279 by the IOMMU when they happen to have been allocated contiguously.
280 This doesn't add pressure to the IOMMU allocator. However, some
281 drivers don't support getting large merged segments coming back
284 Most drivers don't have this problem; it is safe to say Y here.
290 bool "Support for enabling/disabling CPUs"
291 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
293 Say Y here to be able to disable and re-enable individual
294 CPUs at runtime on SMP machines.
296 Say N if you are unsure.
298 config ARCH_ENABLE_MEMORY_HOTPLUG
301 config ARCH_HAS_WALK_MEMORY
304 config ARCH_ENABLE_MEMORY_HOTREMOVE
308 bool "kexec system call (EXPERIMENTAL)"
309 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
311 kexec is a system call that implements the ability to shutdown your
312 current kernel, and to start another kernel. It is like a reboot
313 but it is independent of the system firmware. And like a reboot
314 you can start any kernel with it, not just Linux.
316 The name comes from the similarity to the exec system call.
318 It is an ongoing process to be certain the hardware in a machine
319 is properly shutdown, so do not be surprised if this code does not
320 initially work for you. It may help to enable device hotplugging
321 support. As of this writing the exact hardware interface is
322 strongly in flux, so no good recommendation can be made.
325 bool "Build a kdump crash kernel"
326 depends on PPC_MULTIPLATFORM && PPC64
328 Build a kernel suitable for use as a kdump capture kernel.
329 The kernel will be linked at a different address than normal, and
330 so can only be used for Kdump.
332 Don't change this unless you know what you are doing.
335 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
336 depends on PPC_PSERIES && EXPERIMENTAL
338 Hypervisor-assisted dump is meant to be a kdump replacement
339 offering robustness and speed not possible without system
340 hypervisor assistence.
345 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
346 default y if PPC_PREP
349 bool "Distribute interrupts on all CPUs by default"
350 depends on SMP && !MV64360
352 This option gives the kernel permission to distribute IRQs across
353 multiple CPUs. Saying N here will route all IRQs to the first
354 CPU. Generally saying Y is safe, although some problems have been
355 reported with SMP Power Macintoshes with this option enabled.
360 default y if SMP && PPC_PSERIES
365 depends on NEED_MULTIPLE_NODES
367 config ARCH_SELECT_MEMORY_MODEL
371 config ARCH_FLATMEM_ENABLE
373 depends on (PPC64 && !NUMA) || PPC32
375 config ARCH_SPARSEMEM_ENABLE
378 select SPARSEMEM_VMEMMAP_ENABLE
380 config ARCH_SPARSEMEM_DEFAULT
382 depends on (SMP && PPC_PSERIES) || PPC_PS3
384 config ARCH_POPULATES_NODE_MAP
389 config ARCH_MEMORY_PROBE
391 depends on MEMORY_HOTPLUG
393 # Some NUMA nodes have memory ranges that span
394 # other nodes. Even though a pfn is valid and
395 # between a node's start and end pfns, it may not
396 # reside on that node. See memmap_init_zone()
398 config NODES_SPAN_OTHER_NODES
400 depends on NEED_MULTIPLE_NODES
402 config PPC_HAS_HASH_64K
410 select PPC_HAS_HASH_64K
412 This option changes the kernel logical page size to 64k. On machines
413 without processor support for 64k pages, the kernel will simulate
414 them by loading each individual 4k page on demand transparently,
415 while on hardware with such support, it will be used to map
416 normal application pages.
418 config FORCE_MAX_ZONEORDER
419 int "Maximum zone order"
420 range 9 64 if PPC_64K_PAGES
421 default "9" if PPC_64K_PAGES
422 range 13 64 if PPC64 && !PPC_64K_PAGES
423 default "13" if PPC64 && !PPC_64K_PAGES
427 The kernel memory allocator divides physically contiguous memory
428 blocks into "zones", where each zone is a power of two number of
429 pages. This option selects the largest power of two that the kernel
430 keeps in the memory allocator. If you need to allocate very large
431 blocks of physically contiguous memory, then you may need to
434 This config option is actually maximum order plus one. For example,
435 a value of 11 means that the largest free memory block is 2^10 pages.
437 The page size is not necessarily 4KB. For example, on 64-bit
438 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
439 this in mind when choosing a value for this option.
441 config PPC_SUBPAGE_PROT
442 bool "Support setting protections for 4k subpages"
443 depends on PPC_64K_PAGES
445 This option adds support for a system call to allow user programs
446 to set access permissions (read/write, readonly, or no access)
447 on the 4k subpages of each 64k page.
450 bool "SMT (Hyperthreading) scheduler support"
451 depends on PPC64 && SMP
453 SMT scheduler support improves the CPU scheduler's decision making
454 when dealing with POWER5 cpus at a cost of slightly increased
455 overhead in some places. If unsure say N here.
457 config PROC_DEVICETREE
458 bool "Support for device tree in /proc"
461 This option adds a device-tree directory under /proc which contains
462 an image of the device tree that the kernel copies from Open
463 Firmware or other boot firmware. If unsure, say Y here.
466 bool "Default bootloader kernel arguments"
469 string "Initial kernel command string"
470 depends on CMDLINE_BOOL
471 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
473 On some platforms, there is currently no way for the boot loader to
474 pass arguments to the kernel. For these platforms, you can supply
475 some command-line options at build time by entering them here. In
476 most cases you will need to specify the root device here.
479 string "Additional default image types"
481 List additional targets to be built by the bootwrapper here (separated
482 by spaces). This is useful for targets that depend of device tree
483 files in the .dts directory.
485 Targets in this list will be build as part of the default build
486 target, or when the user does a 'make zImage' or a
487 'make zImage.initrd'.
489 If unsure, leave blank
492 config ARCH_WANTS_FREEZER_CONTROL
496 source kernel/power/Kconfig
500 bool "Enable seccomp to safely compute untrusted bytecode"
504 This kernel feature is useful for number crunching applications
505 that may need to compute untrusted bytecode during their
506 execution. By using pipes or other transports made available to
507 the process as file descriptors supporting the read/write
508 syscalls, it's possible to isolate those applications in
509 their own address space using seccomp. Once seccomp is
510 enabled via /proc/<pid>/seccomp, it cannot be disabled
511 and the task is only allowed to execute a few safe syscalls
512 defined by each seccomp mode.
514 If unsure, say Y. Only embedded should say N here.
520 default !PPC_ISERIES || PCI
525 bool "Support for ISA-bus hardware"
526 depends on PPC_PREP || PPC_CHRP
529 Find out whether you have ISA slots on your motherboard. ISA is the
530 name of a bus system, i.e. the way the CPU talks to the other stuff
531 inside your box. If you have an Apple machine, say N here; if you
532 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
533 you have an embedded board, consult your board documentation.
539 config GENERIC_ISA_DMA
541 depends on PPC64 || POWER4 || 6xx && !CPM2
544 config PPC_INDIRECT_PCI
547 default y if 40x || 44x
561 select PPC_INDIRECT_PCI
569 Freescale Localbus support
573 depends on PPC_83xx || QUICC_ENGINE || CPM2
575 Freescale General-purpose Timers support
577 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
581 # Platforms that what PCI turned unconditionally just do select PCI
582 # in their config node. Platforms that want to choose at config
583 # time should select PPC_PCI_CHOICE
584 config PPC_PCI_CHOICE
588 bool "PCI support" if PPC_PCI_CHOICE
589 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
590 && !PPC_85xx && !PPC_86xx
591 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
592 default PCI_QSPAN if !4xx && !CPM2 && 8xx
593 select ARCH_SUPPORTS_MSI
595 Find out whether your system includes a PCI bus. PCI is the name of
596 a bus system, i.e. the way the CPU talks to the other stuff inside
597 your box. If you say Y here, the kernel will include drivers and
598 infrastructure code to support PCI bus devices.
608 depends on !4xx && !CPM2 && 8xx
611 Say Y here if you have a system based on a Motorola 8xx-series
612 embedded processor with a QSPAN PCI interface, otherwise say N.
616 depends on PCI && 8260
617 select PPC_INDIRECT_PCI
621 bool "Enable workaround for MPC826x erratum PCI 9"
622 depends on PCI_8260 && !8272
626 prompt "IDMA channel for PCI 9 workaround"
629 config 8260_PCI9_IDMA1
632 config 8260_PCI9_IDMA2
635 config 8260_PCI9_IDMA3
638 config 8260_PCI9_IDMA4
643 source "drivers/pci/pcie/Kconfig"
645 source "drivers/pci/Kconfig"
647 source "drivers/pcmcia/Kconfig"
649 source "drivers/pci/hotplug/Kconfig"
656 bool "RapidIO support"
657 depends on HAS_RAPIDIO
659 If you say Y here, the kernel will include drivers and
660 infrastructure code to support RapidIO interconnect devices.
662 source "drivers/rapidio/Kconfig"
666 menu "Advanced setup"
669 config ADVANCED_OPTIONS
670 bool "Prompt for advanced kernel configuration options"
672 This option will enable prompting for a variety of advanced kernel
673 configuration options. These options can cause the kernel to not
674 work if they are set incorrectly, but can be used to optimize certain
675 aspects of kernel memory management.
677 Unless you know what you are doing, say N here.
679 comment "Default settings for advanced configuration options are used"
680 depends on !ADVANCED_OPTIONS
682 config LOWMEM_SIZE_BOOL
683 bool "Set maximum low memory"
684 depends on ADVANCED_OPTIONS
686 This option allows you to set the maximum amount of memory which
687 will be used as "low memory", that is, memory which the kernel can
688 access directly, without having to set up a kernel virtual mapping.
689 This can be useful in optimizing the layout of kernel virtual
692 Say N here unless you know what you are doing.
695 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
699 bool "Build a relocatable kernel (EXPERIMENTAL)"
700 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
702 This builds a kernel image that is capable of running at the
703 location the kernel is loaded at (some alignment restrictions may
706 One use is for the kexec on panic case where the recovery kernel
707 must live at a different physical address than the primary
710 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
711 it has been loaded at and the compile time physical addresses
712 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
713 setting can still be useful to bootwrappers that need to know the
714 load location of the kernel (eg. u-boot/mkimage).
716 config PAGE_OFFSET_BOOL
717 bool "Set custom page offset address"
718 depends on ADVANCED_OPTIONS
720 This option allows you to set the kernel virtual address at which
721 the kernel will map low memory. This can be useful in optimizing
722 the virtual memory layout of the system.
724 Say N here unless you know what you are doing.
727 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
730 config KERNEL_START_BOOL
731 bool "Set custom kernel base address"
732 depends on ADVANCED_OPTIONS
734 This option allows you to set the kernel virtual address at which
735 the kernel will be loaded. Normally this should match PAGE_OFFSET
736 however there are times (like kdump) that one might not want them
739 Say N here unless you know what you are doing.
742 hex "Virtual address of kernel base" if KERNEL_START_BOOL
743 default PAGE_OFFSET if PAGE_OFFSET_BOOL
744 default "0xc2000000" if CRASH_DUMP
747 config PHYSICAL_START_BOOL
748 bool "Set physical address where the kernel is loaded"
749 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
751 This gives the physical address where the kernel is loaded.
753 Say N here unless you know what you are doing.
755 config PHYSICAL_START
756 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
757 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
760 config PHYSICAL_ALIGN
762 default "0x10000000" if FSL_BOOKE
764 This value puts the alignment restrictions on physical address
765 where kernel is loaded and run from. Kernel is compiled for an
766 address which meets above alignment restriction.
768 config TASK_SIZE_BOOL
769 bool "Set custom user task size"
770 depends on ADVANCED_OPTIONS
772 This option allows you to set the amount of virtual address space
773 allocated to user tasks. This can be useful in optimizing the
774 virtual memory layout of the system.
776 Say N here unless you know what you are doing.
779 hex "Size of user task space" if TASK_SIZE_BOOL
780 default "0x80000000" if PPC_PREP || PPC_8xx
783 config CONSISTENT_START_BOOL
784 bool "Set custom consistent memory pool address"
785 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
787 This option allows you to set the base virtual address
788 of the consistent memory pool. This pool of virtual
789 memory is used to make consistent memory allocations.
791 config CONSISTENT_START
792 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
793 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
794 default "0xff100000" if NOT_COHERENT_CACHE
796 config CONSISTENT_SIZE_BOOL
797 bool "Set custom consistent memory pool size"
798 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
800 This option allows you to set the size of the
801 consistent memory pool. This pool of virtual memory
802 is used to make consistent memory allocations.
804 config CONSISTENT_SIZE
805 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
806 default "0x00200000" if NOT_COHERENT_CACHE
809 bool "Pinned Kernel TLBs (860 ONLY)"
810 depends on ADVANCED_OPTIONS && 8xx
815 bool "Build a relocatable kernel"
817 This builds a kernel image that is capable of running anywhere
818 in the RMA (real memory area) at any 16k-aligned base address.
819 The kernel is linked as a position-independent executable (PIE)
820 and contains dynamic relocations which are processed early
821 in the bootup process.
823 One use is for the kexec on panic case where the recovery kernel
824 must live at a different physical address than the primary
829 default "0xc000000000000000"
832 default "0xc000000002000000" if CRASH_DUMP
833 default "0xc000000000000000"
834 config PHYSICAL_START
836 default "0x02000000" if CRASH_DUMP
842 source "drivers/Kconfig"
846 # XXX source "arch/ppc/8xx_io/Kconfig"
848 # XXX source "arch/ppc/8260_io/Kconfig"
850 source "arch/powerpc/sysdev/qe_lib/Kconfig"
854 source "arch/powerpc/Kconfig.debug"
856 source "security/Kconfig"
860 depends on COMPAT && KEYS
863 source "crypto/Kconfig"
873 source "arch/powerpc/kvm/Kconfig"