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 range 9 64 if PPC_64K_PAGES
419 default "9" if PPC_64K_PAGES
420 range 13 64 if PPC64 && !PPC_64K_PAGES
421 default "13" if PPC64 && !PPC_64K_PAGES
425 The kernel memory allocator divides physically contiguous memory
426 blocks into "zones", where each zone is a power of two number of
427 pages. This option selects the largest power of two that the kernel
428 keeps in the memory allocator. If you need to allocate very large
429 blocks of physically contiguous memory, then you may need to
432 This config option is actually maximum order plus one. For example,
433 a value of 11 means that the largest free memory block is 2^10 pages.
435 The page size is not necessarily 4KB. For example, on 64-bit
436 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
437 this in mind when choosing a value for this option.
439 config PPC_SUBPAGE_PROT
440 bool "Support setting protections for 4k subpages"
441 depends on PPC_64K_PAGES
443 This option adds support for a system call to allow user programs
444 to set access permissions (read/write, readonly, or no access)
445 on the 4k subpages of each 64k page.
448 bool "SMT (Hyperthreading) scheduler support"
449 depends on PPC64 && SMP
451 SMT scheduler support improves the CPU scheduler's decision making
452 when dealing with POWER5 cpus at a cost of slightly increased
453 overhead in some places. If unsure say N here.
455 config PROC_DEVICETREE
456 bool "Support for device tree in /proc"
459 This option adds a device-tree directory under /proc which contains
460 an image of the device tree that the kernel copies from Open
461 Firmware or other boot firmware. If unsure, say Y here.
464 bool "Default bootloader kernel arguments"
467 string "Initial kernel command string"
468 depends on CMDLINE_BOOL
469 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
471 On some platforms, there is currently no way for the boot loader to
472 pass arguments to the kernel. For these platforms, you can supply
473 some command-line options at build time by entering them here. In
474 most cases you will need to specify the root device here.
477 string "Additional default image types"
479 List additional targets to be built by the bootwrapper here (separated
480 by spaces). This is useful for targets that depend of device tree
481 files in the .dts directory.
483 Targets in this list will be build as part of the default build
484 target, or when the user does a 'make zImage' or a
485 'make zImage.initrd'.
487 If unsure, leave blank
490 config ARCH_WANTS_FREEZER_CONTROL
494 source kernel/power/Kconfig
498 bool "Enable seccomp to safely compute untrusted bytecode"
502 This kernel feature is useful for number crunching applications
503 that may need to compute untrusted bytecode during their
504 execution. By using pipes or other transports made available to
505 the process as file descriptors supporting the read/write
506 syscalls, it's possible to isolate those applications in
507 their own address space using seccomp. Once seccomp is
508 enabled via /proc/<pid>/seccomp, it cannot be disabled
509 and the task is only allowed to execute a few safe syscalls
510 defined by each seccomp mode.
512 If unsure, say Y. Only embedded should say N here.
518 default !PPC_ISERIES || PCI
523 bool "Support for ISA-bus hardware"
524 depends on PPC_PREP || PPC_CHRP
527 Find out whether you have ISA slots on your motherboard. ISA is the
528 name of a bus system, i.e. the way the CPU talks to the other stuff
529 inside your box. If you have an Apple machine, say N here; if you
530 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
531 you have an embedded board, consult your board documentation.
537 config GENERIC_ISA_DMA
539 depends on PPC64 || POWER4 || 6xx && !CPM2
542 config PPC_INDIRECT_PCI
545 default y if 40x || 44x
559 select PPC_INDIRECT_PCI
567 Freescale Localbus support
571 depends on PPC_83xx || QUICC_ENGINE || CPM2
573 Freescale General-purpose Timers support
575 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
579 # Platforms that what PCI turned unconditionally just do select PCI
580 # in their config node. Platforms that want to choose at config
581 # time should select PPC_PCI_CHOICE
582 config PPC_PCI_CHOICE
586 bool "PCI support" if PPC_PCI_CHOICE
587 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
588 && !PPC_85xx && !PPC_86xx
589 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
590 default PCI_QSPAN if !4xx && !CPM2 && 8xx
591 select ARCH_SUPPORTS_MSI
593 Find out whether your system includes a PCI bus. PCI is the name of
594 a bus system, i.e. the way the CPU talks to the other stuff inside
595 your box. If you say Y here, the kernel will include drivers and
596 infrastructure code to support PCI bus devices.
606 depends on !4xx && !CPM2 && 8xx
609 Say Y here if you have a system based on a Motorola 8xx-series
610 embedded processor with a QSPAN PCI interface, otherwise say N.
614 depends on PCI && 8260
615 select PPC_INDIRECT_PCI
619 bool "Enable workaround for MPC826x erratum PCI 9"
620 depends on PCI_8260 && !8272
624 prompt "IDMA channel for PCI 9 workaround"
627 config 8260_PCI9_IDMA1
630 config 8260_PCI9_IDMA2
633 config 8260_PCI9_IDMA3
636 config 8260_PCI9_IDMA4
641 source "drivers/pci/pcie/Kconfig"
643 source "drivers/pci/Kconfig"
645 source "drivers/pcmcia/Kconfig"
647 source "drivers/pci/hotplug/Kconfig"
654 bool "RapidIO support"
655 depends on HAS_RAPIDIO
657 If you say Y here, the kernel will include drivers and
658 infrastructure code to support RapidIO interconnect devices.
660 source "drivers/rapidio/Kconfig"
664 menu "Advanced setup"
667 config ADVANCED_OPTIONS
668 bool "Prompt for advanced kernel configuration options"
670 This option will enable prompting for a variety of advanced kernel
671 configuration options. These options can cause the kernel to not
672 work if they are set incorrectly, but can be used to optimize certain
673 aspects of kernel memory management.
675 Unless you know what you are doing, say N here.
677 comment "Default settings for advanced configuration options are used"
678 depends on !ADVANCED_OPTIONS
680 config LOWMEM_SIZE_BOOL
681 bool "Set maximum low memory"
682 depends on ADVANCED_OPTIONS
684 This option allows you to set the maximum amount of memory which
685 will be used as "low memory", that is, memory which the kernel can
686 access directly, without having to set up a kernel virtual mapping.
687 This can be useful in optimizing the layout of kernel virtual
690 Say N here unless you know what you are doing.
693 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
697 bool "Build a relocatable kernel (EXPERIMENTAL)"
698 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
700 This builds a kernel image that is capable of running at the
701 location the kernel is loaded at (some alignment restrictions may
704 One use is for the kexec on panic case where the recovery kernel
705 must live at a different physical address than the primary
708 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
709 it has been loaded at and the compile time physical addresses
710 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
711 setting can still be useful to bootwrappers that need to know the
712 load location of the kernel (eg. u-boot/mkimage).
714 config PAGE_OFFSET_BOOL
715 bool "Set custom page offset address"
716 depends on ADVANCED_OPTIONS
718 This option allows you to set the kernel virtual address at which
719 the kernel will map low memory. This can be useful in optimizing
720 the virtual memory layout of the system.
722 Say N here unless you know what you are doing.
725 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
728 config KERNEL_START_BOOL
729 bool "Set custom kernel base address"
730 depends on ADVANCED_OPTIONS
732 This option allows you to set the kernel virtual address at which
733 the kernel will be loaded. Normally this should match PAGE_OFFSET
734 however there are times (like kdump) that one might not want them
737 Say N here unless you know what you are doing.
740 hex "Virtual address of kernel base" if KERNEL_START_BOOL
741 default PAGE_OFFSET if PAGE_OFFSET_BOOL
742 default "0xc2000000" if CRASH_DUMP
745 config PHYSICAL_START_BOOL
746 bool "Set physical address where the kernel is loaded"
747 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
749 This gives the physical address where the kernel is loaded.
751 Say N here unless you know what you are doing.
753 config PHYSICAL_START
754 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
755 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
758 config PHYSICAL_ALIGN
760 default "0x10000000" if FSL_BOOKE
762 This value puts the alignment restrictions on physical address
763 where kernel is loaded and run from. Kernel is compiled for an
764 address which meets above alignment restriction.
766 config TASK_SIZE_BOOL
767 bool "Set custom user task size"
768 depends on ADVANCED_OPTIONS
770 This option allows you to set the amount of virtual address space
771 allocated to user tasks. This can be useful in optimizing the
772 virtual memory layout of the system.
774 Say N here unless you know what you are doing.
777 hex "Size of user task space" if TASK_SIZE_BOOL
778 default "0x80000000" if PPC_PREP || PPC_8xx
781 config CONSISTENT_START_BOOL
782 bool "Set custom consistent memory pool address"
783 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
785 This option allows you to set the base virtual address
786 of the consistent memory pool. This pool of virtual
787 memory is used to make consistent memory allocations.
789 config CONSISTENT_START
790 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
791 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
792 default "0xff100000" if NOT_COHERENT_CACHE
794 config CONSISTENT_SIZE_BOOL
795 bool "Set custom consistent memory pool size"
796 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
798 This option allows you to set the size of the
799 consistent memory pool. This pool of virtual memory
800 is used to make consistent memory allocations.
802 config CONSISTENT_SIZE
803 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
804 default "0x00200000" if NOT_COHERENT_CACHE
807 bool "Pinned Kernel TLBs (860 ONLY)"
808 depends on ADVANCED_OPTIONS && 8xx
813 bool "Build a relocatable kernel"
815 This builds a kernel image that is capable of running anywhere
816 in the RMA (real memory area) at any 16k-aligned base address.
817 The kernel is linked as a position-independent executable (PIE)
818 and contains dynamic relocations which are processed early
819 in the bootup process.
821 One use is for the kexec on panic case where the recovery kernel
822 must live at a different physical address than the primary
827 default "0xc000000000000000"
830 default "0xc000000002000000" if CRASH_DUMP
831 default "0xc000000000000000"
832 config PHYSICAL_START
834 default "0x02000000" if CRASH_DUMP
840 source "drivers/Kconfig"
844 # XXX source "arch/ppc/8xx_io/Kconfig"
846 # XXX source "arch/ppc/8260_io/Kconfig"
848 source "arch/powerpc/sysdev/qe_lib/Kconfig"
852 source "arch/powerpc/Kconfig.debug"
854 source "security/Kconfig"
858 depends on COMPAT && KEYS
861 source "crypto/Kconfig"
871 source "arch/powerpc/kvm/Kconfig"