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_DYNAMIC_FTRACE
116 select ARCH_WANT_OPTIONAL_GPIOLIB
118 select HAVE_IOREMAP_PROT
119 select HAVE_EFFICIENT_UNALIGNED_ACCESS
121 select HAVE_ARCH_KGDB
122 select HAVE_KRETPROBES
123 select HAVE_ARCH_TRACEHOOK
125 select HAVE_DMA_ATTRS if PPC64
126 select USE_GENERIC_SMP_HELPERS if SMP
136 select COMPAT_BINFMT_ELF
138 config SYSVIPC_COMPAT
140 depends on COMPAT && SYSVIPC
143 # All PPC32s use generic nvram driver through ppc_md
148 config SCHED_NO_NO_OMIT_FRAME_POINTER
152 config ARCH_MAY_HAVE_PC_FDC
154 default !PPC_PSERIES || PCI
162 config PPC_UDBG_16550
166 config GENERIC_TBSYNC
168 default y if PPC32 && SMP
180 config SYS_SUPPORTS_APM_EMULATION
181 default y if PMAC_APM_EMU
184 config DEFAULT_UIMAGE
187 Used to allow a board to specify it wants a uImage built by default
195 depends on (PPC_PMAC && !SMP) || BROKEN
200 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
203 config ARCH_HIBERNATION_POSSIBLE
205 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
208 config ARCH_SUSPEND_POSSIBLE
210 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
212 config PPC_DCR_NATIVE
222 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
225 config PPC_OF_PLATFORM_PCI
228 depends on PPC64 # not supported on 32 bits yet
231 source "init/Kconfig"
233 source "arch/powerpc/sysdev/Kconfig"
234 source "arch/powerpc/platforms/Kconfig"
236 menu "Kernel options"
239 bool "High memory support"
242 source kernel/time/Kconfig
243 source kernel/Kconfig.hz
244 source kernel/Kconfig.preempt
245 source "fs/Kconfig.binfmt"
247 config HUGETLB_PAGE_SIZE_VARIABLE
249 depends on HUGETLB_PAGE
252 config MATH_EMULATION
253 bool "Math emulation"
254 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
256 Some PowerPC chips designed for embedded applications do not have
257 a floating-point unit and therefore do not implement the
258 floating-point instructions in the PowerPC instruction set. If you
259 say Y here, the kernel will include code to emulate a floating-point
260 unit, which will allow programs that use floating-point
263 config 8XX_MINIMAL_FPEMU
264 bool "Minimal math emulation for 8xx"
265 depends on 8xx && !MATH_EMULATION
267 Older arch/ppc kernels still emulated a few floating point
268 instructions such as load and store, even when full math
269 emulation is disabled. Say "Y" here if you want to preserve
272 It is recommended that you build a soft-float userspace instead.
275 bool "Enable IOMMU virtual merging"
279 Cause IO segments sent to a device for DMA to be merged virtually
280 by the IOMMU when they happen to have been allocated contiguously.
281 This doesn't add pressure to the IOMMU allocator. However, some
282 drivers don't support getting large merged segments coming back
285 Most drivers don't have this problem; it is safe to say Y here.
291 bool "Support for enabling/disabling CPUs"
292 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
294 Say Y here to be able to disable and re-enable individual
295 CPUs at runtime on SMP machines.
297 Say N if you are unsure.
299 config ARCH_ENABLE_MEMORY_HOTPLUG
302 config ARCH_HAS_WALK_MEMORY
305 config ARCH_ENABLE_MEMORY_HOTREMOVE
309 bool "kexec system call (EXPERIMENTAL)"
310 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
312 kexec is a system call that implements the ability to shutdown your
313 current kernel, and to start another kernel. It is like a reboot
314 but it is independent of the system firmware. And like a reboot
315 you can start any kernel with it, not just Linux.
317 The name comes from the similarity to the exec system call.
319 It is an ongoing process to be certain the hardware in a machine
320 is properly shutdown, so do not be surprised if this code does not
321 initially work for you. It may help to enable device hotplugging
322 support. As of this writing the exact hardware interface is
323 strongly in flux, so no good recommendation can be made.
326 bool "Build a kdump crash kernel"
327 depends on PPC_MULTIPLATFORM && PPC64
329 Build a kernel suitable for use as a kdump capture kernel.
330 The kernel will be linked at a different address than normal, and
331 so can only be used for Kdump.
333 Don't change this unless you know what you are doing.
336 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
337 depends on PPC_PSERIES && EXPERIMENTAL
339 Hypervisor-assisted dump is meant to be a kdump replacement
340 offering robustness and speed not possible without system
341 hypervisor assistence.
346 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
347 default y if PPC_PREP
350 bool "Distribute interrupts on all CPUs by default"
351 depends on SMP && !MV64360
353 This option gives the kernel permission to distribute IRQs across
354 multiple CPUs. Saying N here will route all IRQs to the first
355 CPU. Generally saying Y is safe, although some problems have been
356 reported with SMP Power Macintoshes with this option enabled.
361 default y if SMP && PPC_PSERIES
366 depends on NEED_MULTIPLE_NODES
368 config ARCH_SELECT_MEMORY_MODEL
372 config ARCH_FLATMEM_ENABLE
374 depends on (PPC64 && !NUMA) || PPC32
376 config ARCH_SPARSEMEM_ENABLE
379 select SPARSEMEM_VMEMMAP_ENABLE
381 config ARCH_SPARSEMEM_DEFAULT
383 depends on (SMP && PPC_PSERIES) || PPC_PS3
385 config ARCH_POPULATES_NODE_MAP
390 config ARCH_MEMORY_PROBE
392 depends on MEMORY_HOTPLUG
394 # Some NUMA nodes have memory ranges that span
395 # other nodes. Even though a pfn is valid and
396 # between a node's start and end pfns, it may not
397 # reside on that node. See memmap_init_zone()
399 config NODES_SPAN_OTHER_NODES
401 depends on NEED_MULTIPLE_NODES
403 config PPC_HAS_HASH_64K
411 select PPC_HAS_HASH_64K
413 This option changes the kernel logical page size to 64k. On machines
414 without processor support for 64k pages, the kernel will simulate
415 them by loading each individual 4k page on demand transparently,
416 while on hardware with such support, it will be used to map
417 normal application pages.
419 config FORCE_MAX_ZONEORDER
420 int "Maximum zone order"
421 range 9 64 if PPC_64K_PAGES
422 default "9" if PPC_64K_PAGES
423 range 13 64 if PPC64 && !PPC_64K_PAGES
424 default "13" if PPC64 && !PPC_64K_PAGES
428 The kernel memory allocator divides physically contiguous memory
429 blocks into "zones", where each zone is a power of two number of
430 pages. This option selects the largest power of two that the kernel
431 keeps in the memory allocator. If you need to allocate very large
432 blocks of physically contiguous memory, then you may need to
435 This config option is actually maximum order plus one. For example,
436 a value of 11 means that the largest free memory block is 2^10 pages.
438 The page size is not necessarily 4KB. For example, on 64-bit
439 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
440 this in mind when choosing a value for this option.
442 config PPC_SUBPAGE_PROT
443 bool "Support setting protections for 4k subpages"
444 depends on PPC_64K_PAGES
446 This option adds support for a system call to allow user programs
447 to set access permissions (read/write, readonly, or no access)
448 on the 4k subpages of each 64k page.
451 bool "SMT (Hyperthreading) scheduler support"
452 depends on PPC64 && SMP
454 SMT scheduler support improves the CPU scheduler's decision making
455 when dealing with POWER5 cpus at a cost of slightly increased
456 overhead in some places. If unsure say N here.
458 config PROC_DEVICETREE
459 bool "Support for device tree in /proc"
462 This option adds a device-tree directory under /proc which contains
463 an image of the device tree that the kernel copies from Open
464 Firmware or other boot firmware. If unsure, say Y here.
467 bool "Default bootloader kernel arguments"
470 string "Initial kernel command string"
471 depends on CMDLINE_BOOL
472 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
474 On some platforms, there is currently no way for the boot loader to
475 pass arguments to the kernel. For these platforms, you can supply
476 some command-line options at build time by entering them here. In
477 most cases you will need to specify the root device here.
480 string "Additional default image types"
482 List additional targets to be built by the bootwrapper here (separated
483 by spaces). This is useful for targets that depend of device tree
484 files in the .dts directory.
486 Targets in this list will be build as part of the default build
487 target, or when the user does a 'make zImage' or a
488 'make zImage.initrd'.
490 If unsure, leave blank
493 config ARCH_WANTS_FREEZER_CONTROL
497 source kernel/power/Kconfig
501 bool "Enable seccomp to safely compute untrusted bytecode"
505 This kernel feature is useful for number crunching applications
506 that may need to compute untrusted bytecode during their
507 execution. By using pipes or other transports made available to
508 the process as file descriptors supporting the read/write
509 syscalls, it's possible to isolate those applications in
510 their own address space using seccomp. Once seccomp is
511 enabled via /proc/<pid>/seccomp, it cannot be disabled
512 and the task is only allowed to execute a few safe syscalls
513 defined by each seccomp mode.
515 If unsure, say Y. Only embedded should say N here.
521 default !PPC_ISERIES || PCI
526 bool "Support for ISA-bus hardware"
527 depends on PPC_PREP || PPC_CHRP
530 Find out whether you have ISA slots on your motherboard. ISA is the
531 name of a bus system, i.e. the way the CPU talks to the other stuff
532 inside your box. If you have an Apple machine, say N here; if you
533 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
534 you have an embedded board, consult your board documentation.
540 config GENERIC_ISA_DMA
542 depends on PPC64 || POWER4 || 6xx && !CPM2
545 config PPC_INDIRECT_PCI
548 default y if 40x || 44x
562 select PPC_INDIRECT_PCI
570 Freescale Localbus support
574 depends on PPC_83xx || QUICC_ENGINE || CPM2
576 Freescale General-purpose Timers support
578 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
582 # Platforms that what PCI turned unconditionally just do select PCI
583 # in their config node. Platforms that want to choose at config
584 # time should select PPC_PCI_CHOICE
585 config PPC_PCI_CHOICE
589 bool "PCI support" if PPC_PCI_CHOICE
590 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
591 && !PPC_85xx && !PPC_86xx
592 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
593 default PCI_QSPAN if !4xx && !CPM2 && 8xx
594 select ARCH_SUPPORTS_MSI
596 Find out whether your system includes a PCI bus. PCI is the name of
597 a bus system, i.e. the way the CPU talks to the other stuff inside
598 your box. If you say Y here, the kernel will include drivers and
599 infrastructure code to support PCI bus devices.
609 depends on !4xx && !CPM2 && 8xx
612 Say Y here if you have a system based on a Motorola 8xx-series
613 embedded processor with a QSPAN PCI interface, otherwise say N.
617 depends on PCI && 8260
618 select PPC_INDIRECT_PCI
622 bool "Enable workaround for MPC826x erratum PCI 9"
623 depends on PCI_8260 && !8272
627 prompt "IDMA channel for PCI 9 workaround"
630 config 8260_PCI9_IDMA1
633 config 8260_PCI9_IDMA2
636 config 8260_PCI9_IDMA3
639 config 8260_PCI9_IDMA4
644 source "drivers/pci/pcie/Kconfig"
646 source "drivers/pci/Kconfig"
648 source "drivers/pcmcia/Kconfig"
650 source "drivers/pci/hotplug/Kconfig"
657 bool "RapidIO support"
658 depends on HAS_RAPIDIO
660 If you say Y here, the kernel will include drivers and
661 infrastructure code to support RapidIO interconnect devices.
663 source "drivers/rapidio/Kconfig"
667 menu "Advanced setup"
670 config ADVANCED_OPTIONS
671 bool "Prompt for advanced kernel configuration options"
673 This option will enable prompting for a variety of advanced kernel
674 configuration options. These options can cause the kernel to not
675 work if they are set incorrectly, but can be used to optimize certain
676 aspects of kernel memory management.
678 Unless you know what you are doing, say N here.
680 comment "Default settings for advanced configuration options are used"
681 depends on !ADVANCED_OPTIONS
683 config LOWMEM_SIZE_BOOL
684 bool "Set maximum low memory"
685 depends on ADVANCED_OPTIONS
687 This option allows you to set the maximum amount of memory which
688 will be used as "low memory", that is, memory which the kernel can
689 access directly, without having to set up a kernel virtual mapping.
690 This can be useful in optimizing the layout of kernel virtual
693 Say N here unless you know what you are doing.
696 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
700 bool "Build a relocatable kernel (EXPERIMENTAL)"
701 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
703 This builds a kernel image that is capable of running at the
704 location the kernel is loaded at (some alignment restrictions may
707 One use is for the kexec on panic case where the recovery kernel
708 must live at a different physical address than the primary
711 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
712 it has been loaded at and the compile time physical addresses
713 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
714 setting can still be useful to bootwrappers that need to know the
715 load location of the kernel (eg. u-boot/mkimage).
717 config PAGE_OFFSET_BOOL
718 bool "Set custom page offset address"
719 depends on ADVANCED_OPTIONS
721 This option allows you to set the kernel virtual address at which
722 the kernel will map low memory. This can be useful in optimizing
723 the virtual memory layout of the system.
725 Say N here unless you know what you are doing.
728 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
731 config KERNEL_START_BOOL
732 bool "Set custom kernel base address"
733 depends on ADVANCED_OPTIONS
735 This option allows you to set the kernel virtual address at which
736 the kernel will be loaded. Normally this should match PAGE_OFFSET
737 however there are times (like kdump) that one might not want them
740 Say N here unless you know what you are doing.
743 hex "Virtual address of kernel base" if KERNEL_START_BOOL
744 default PAGE_OFFSET if PAGE_OFFSET_BOOL
745 default "0xc2000000" if CRASH_DUMP
748 config PHYSICAL_START_BOOL
749 bool "Set physical address where the kernel is loaded"
750 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
752 This gives the physical address where the kernel is loaded.
754 Say N here unless you know what you are doing.
756 config PHYSICAL_START
757 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
758 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
761 config PHYSICAL_ALIGN
763 default "0x10000000" if FSL_BOOKE
765 This value puts the alignment restrictions on physical address
766 where kernel is loaded and run from. Kernel is compiled for an
767 address which meets above alignment restriction.
769 config TASK_SIZE_BOOL
770 bool "Set custom user task size"
771 depends on ADVANCED_OPTIONS
773 This option allows you to set the amount of virtual address space
774 allocated to user tasks. This can be useful in optimizing the
775 virtual memory layout of the system.
777 Say N here unless you know what you are doing.
780 hex "Size of user task space" if TASK_SIZE_BOOL
781 default "0x80000000" if PPC_PREP || PPC_8xx
784 config CONSISTENT_START_BOOL
785 bool "Set custom consistent memory pool address"
786 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
788 This option allows you to set the base virtual address
789 of the consistent memory pool. This pool of virtual
790 memory is used to make consistent memory allocations.
792 config CONSISTENT_START
793 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
794 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
795 default "0xff100000" if NOT_COHERENT_CACHE
797 config CONSISTENT_SIZE_BOOL
798 bool "Set custom consistent memory pool size"
799 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
801 This option allows you to set the size of the
802 consistent memory pool. This pool of virtual memory
803 is used to make consistent memory allocations.
805 config CONSISTENT_SIZE
806 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
807 default "0x00200000" if NOT_COHERENT_CACHE
810 bool "Pinned Kernel TLBs (860 ONLY)"
811 depends on ADVANCED_OPTIONS && 8xx
816 bool "Build a relocatable kernel"
818 This builds a kernel image that is capable of running anywhere
819 in the RMA (real memory area) at any 16k-aligned base address.
820 The kernel is linked as a position-independent executable (PIE)
821 and contains dynamic relocations which are processed early
822 in the bootup process.
824 One use is for the kexec on panic case where the recovery kernel
825 must live at a different physical address than the primary
830 default "0xc000000000000000"
833 default "0xc000000002000000" if CRASH_DUMP
834 default "0xc000000000000000"
835 config PHYSICAL_START
837 default "0x02000000" if CRASH_DUMP
843 source "drivers/Kconfig"
847 # XXX source "arch/ppc/8xx_io/Kconfig"
849 # XXX source "arch/ppc/8260_io/Kconfig"
851 source "arch/powerpc/sysdev/qe_lib/Kconfig"
855 source "arch/powerpc/Kconfig.debug"
857 source "security/Kconfig"
861 depends on COMPAT && KEYS
864 source "crypto/Kconfig"
874 source "arch/powerpc/kvm/Kconfig"