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 "kernel/Kconfig.freezer"
235 source "arch/powerpc/sysdev/Kconfig"
236 source "arch/powerpc/platforms/Kconfig"
238 menu "Kernel options"
241 bool "High memory support"
244 source kernel/time/Kconfig
245 source kernel/Kconfig.hz
246 source kernel/Kconfig.preempt
247 source "fs/Kconfig.binfmt"
249 config HUGETLB_PAGE_SIZE_VARIABLE
251 depends on HUGETLB_PAGE
254 config MATH_EMULATION
255 bool "Math emulation"
256 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
258 Some PowerPC chips designed for embedded applications do not have
259 a floating-point unit and therefore do not implement the
260 floating-point instructions in the PowerPC instruction set. If you
261 say Y here, the kernel will include code to emulate a floating-point
262 unit, which will allow programs that use floating-point
265 config 8XX_MINIMAL_FPEMU
266 bool "Minimal math emulation for 8xx"
267 depends on 8xx && !MATH_EMULATION
269 Older arch/ppc kernels still emulated a few floating point
270 instructions such as load and store, even when full math
271 emulation is disabled. Say "Y" here if you want to preserve
274 It is recommended that you build a soft-float userspace instead.
277 bool "Enable IOMMU virtual merging"
281 Cause IO segments sent to a device for DMA to be merged virtually
282 by the IOMMU when they happen to have been allocated contiguously.
283 This doesn't add pressure to the IOMMU allocator. However, some
284 drivers don't support getting large merged segments coming back
287 Most drivers don't have this problem; it is safe to say Y here.
293 bool "Support for enabling/disabling CPUs"
294 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
296 Say Y here to be able to disable and re-enable individual
297 CPUs at runtime on SMP machines.
299 Say N if you are unsure.
301 config ARCH_ENABLE_MEMORY_HOTPLUG
304 config ARCH_HAS_WALK_MEMORY
307 config ARCH_ENABLE_MEMORY_HOTREMOVE
311 bool "kexec system call (EXPERIMENTAL)"
312 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
314 kexec is a system call that implements the ability to shutdown your
315 current kernel, and to start another kernel. It is like a reboot
316 but it is independent of the system firmware. And like a reboot
317 you can start any kernel with it, not just Linux.
319 The name comes from the similarity to the exec system call.
321 It is an ongoing process to be certain the hardware in a machine
322 is properly shutdown, so do not be surprised if this code does not
323 initially work for you. It may help to enable device hotplugging
324 support. As of this writing the exact hardware interface is
325 strongly in flux, so no good recommendation can be made.
328 bool "Build a kdump crash kernel"
329 depends on PPC_MULTIPLATFORM && PPC64
331 Build a kernel suitable for use as a kdump capture kernel.
332 The kernel will be linked at a different address than normal, and
333 so can only be used for Kdump.
335 Don't change this unless you know what you are doing.
338 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
339 depends on PPC_PSERIES && EXPERIMENTAL
341 Hypervisor-assisted dump is meant to be a kdump replacement
342 offering robustness and speed not possible without system
343 hypervisor assistence.
348 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
349 default y if PPC_PREP
352 bool "Distribute interrupts on all CPUs by default"
353 depends on SMP && !MV64360
355 This option gives the kernel permission to distribute IRQs across
356 multiple CPUs. Saying N here will route all IRQs to the first
357 CPU. Generally saying Y is safe, although some problems have been
358 reported with SMP Power Macintoshes with this option enabled.
363 default y if SMP && PPC_PSERIES
368 depends on NEED_MULTIPLE_NODES
370 config ARCH_SELECT_MEMORY_MODEL
374 config ARCH_FLATMEM_ENABLE
376 depends on (PPC64 && !NUMA) || PPC32
378 config ARCH_SPARSEMEM_ENABLE
381 select SPARSEMEM_VMEMMAP_ENABLE
383 config ARCH_SPARSEMEM_DEFAULT
385 depends on (SMP && PPC_PSERIES) || PPC_PS3
387 config ARCH_POPULATES_NODE_MAP
392 config ARCH_MEMORY_PROBE
394 depends on MEMORY_HOTPLUG
396 # Some NUMA nodes have memory ranges that span
397 # other nodes. Even though a pfn is valid and
398 # between a node's start and end pfns, it may not
399 # reside on that node. See memmap_init_zone()
401 config NODES_SPAN_OTHER_NODES
403 depends on NEED_MULTIPLE_NODES
405 config PPC_HAS_HASH_64K
413 select PPC_HAS_HASH_64K
415 This option changes the kernel logical page size to 64k. On machines
416 without processor support for 64k pages, the kernel will simulate
417 them by loading each individual 4k page on demand transparently,
418 while on hardware with such support, it will be used to map
419 normal application pages.
421 config FORCE_MAX_ZONEORDER
422 int "Maximum zone order"
423 range 9 64 if PPC_64K_PAGES
424 default "9" if PPC_64K_PAGES
425 range 13 64 if PPC64 && !PPC_64K_PAGES
426 default "13" if PPC64 && !PPC_64K_PAGES
430 The kernel memory allocator divides physically contiguous memory
431 blocks into "zones", where each zone is a power of two number of
432 pages. This option selects the largest power of two that the kernel
433 keeps in the memory allocator. If you need to allocate very large
434 blocks of physically contiguous memory, then you may need to
437 This config option is actually maximum order plus one. For example,
438 a value of 11 means that the largest free memory block is 2^10 pages.
440 The page size is not necessarily 4KB. For example, on 64-bit
441 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
442 this in mind when choosing a value for this option.
444 config PPC_SUBPAGE_PROT
445 bool "Support setting protections for 4k subpages"
446 depends on PPC_64K_PAGES
448 This option adds support for a system call to allow user programs
449 to set access permissions (read/write, readonly, or no access)
450 on the 4k subpages of each 64k page.
453 bool "SMT (Hyperthreading) scheduler support"
454 depends on PPC64 && SMP
456 SMT scheduler support improves the CPU scheduler's decision making
457 when dealing with POWER5 cpus at a cost of slightly increased
458 overhead in some places. If unsure say N here.
460 config PROC_DEVICETREE
461 bool "Support for device tree in /proc"
464 This option adds a device-tree directory under /proc which contains
465 an image of the device tree that the kernel copies from Open
466 Firmware or other boot firmware. If unsure, say Y here.
469 bool "Default bootloader kernel arguments"
472 string "Initial kernel command string"
473 depends on CMDLINE_BOOL
474 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
476 On some platforms, there is currently no way for the boot loader to
477 pass arguments to the kernel. For these platforms, you can supply
478 some command-line options at build time by entering them here. In
479 most cases you will need to specify the root device here.
482 string "Additional default image types"
484 List additional targets to be built by the bootwrapper here (separated
485 by spaces). This is useful for targets that depend of device tree
486 files in the .dts directory.
488 Targets in this list will be build as part of the default build
489 target, or when the user does a 'make zImage' or a
490 'make zImage.initrd'.
492 If unsure, leave blank
495 config ARCH_WANTS_FREEZER_CONTROL
499 source kernel/power/Kconfig
503 bool "Enable seccomp to safely compute untrusted bytecode"
507 This kernel feature is useful for number crunching applications
508 that may need to compute untrusted bytecode during their
509 execution. By using pipes or other transports made available to
510 the process as file descriptors supporting the read/write
511 syscalls, it's possible to isolate those applications in
512 their own address space using seccomp. Once seccomp is
513 enabled via /proc/<pid>/seccomp, it cannot be disabled
514 and the task is only allowed to execute a few safe syscalls
515 defined by each seccomp mode.
517 If unsure, say Y. Only embedded should say N here.
523 default !PPC_ISERIES || PCI
528 bool "Support for ISA-bus hardware"
529 depends on PPC_PREP || PPC_CHRP
532 Find out whether you have ISA slots on your motherboard. ISA is the
533 name of a bus system, i.e. the way the CPU talks to the other stuff
534 inside your box. If you have an Apple machine, say N here; if you
535 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
536 you have an embedded board, consult your board documentation.
542 config GENERIC_ISA_DMA
544 depends on PPC64 || POWER4 || 6xx && !CPM2
547 config PPC_INDIRECT_PCI
550 default y if 40x || 44x
564 select PPC_INDIRECT_PCI
572 Freescale Localbus support
576 depends on PPC_83xx || QUICC_ENGINE || CPM2
578 Freescale General-purpose Timers support
580 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
584 # Platforms that what PCI turned unconditionally just do select PCI
585 # in their config node. Platforms that want to choose at config
586 # time should select PPC_PCI_CHOICE
587 config PPC_PCI_CHOICE
591 bool "PCI support" if PPC_PCI_CHOICE
592 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
593 && !PPC_85xx && !PPC_86xx
594 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
595 default PCI_QSPAN if !4xx && !CPM2 && 8xx
596 select ARCH_SUPPORTS_MSI
598 Find out whether your system includes a PCI bus. PCI is the name of
599 a bus system, i.e. the way the CPU talks to the other stuff inside
600 your box. If you say Y here, the kernel will include drivers and
601 infrastructure code to support PCI bus devices.
611 depends on !4xx && !CPM2 && 8xx
614 Say Y here if you have a system based on a Motorola 8xx-series
615 embedded processor with a QSPAN PCI interface, otherwise say N.
619 depends on PCI && 8260
620 select PPC_INDIRECT_PCI
624 bool "Enable workaround for MPC826x erratum PCI 9"
625 depends on PCI_8260 && !8272
629 prompt "IDMA channel for PCI 9 workaround"
632 config 8260_PCI9_IDMA1
635 config 8260_PCI9_IDMA2
638 config 8260_PCI9_IDMA3
641 config 8260_PCI9_IDMA4
646 source "drivers/pci/pcie/Kconfig"
648 source "drivers/pci/Kconfig"
650 source "drivers/pcmcia/Kconfig"
652 source "drivers/pci/hotplug/Kconfig"
659 bool "RapidIO support"
660 depends on HAS_RAPIDIO
662 If you say Y here, the kernel will include drivers and
663 infrastructure code to support RapidIO interconnect devices.
665 source "drivers/rapidio/Kconfig"
669 menu "Advanced setup"
672 config ADVANCED_OPTIONS
673 bool "Prompt for advanced kernel configuration options"
675 This option will enable prompting for a variety of advanced kernel
676 configuration options. These options can cause the kernel to not
677 work if they are set incorrectly, but can be used to optimize certain
678 aspects of kernel memory management.
680 Unless you know what you are doing, say N here.
682 comment "Default settings for advanced configuration options are used"
683 depends on !ADVANCED_OPTIONS
685 config LOWMEM_SIZE_BOOL
686 bool "Set maximum low memory"
687 depends on ADVANCED_OPTIONS
689 This option allows you to set the maximum amount of memory which
690 will be used as "low memory", that is, memory which the kernel can
691 access directly, without having to set up a kernel virtual mapping.
692 This can be useful in optimizing the layout of kernel virtual
695 Say N here unless you know what you are doing.
698 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
702 bool "Build a relocatable kernel (EXPERIMENTAL)"
703 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
705 This builds a kernel image that is capable of running at the
706 location the kernel is loaded at (some alignment restrictions may
709 One use is for the kexec on panic case where the recovery kernel
710 must live at a different physical address than the primary
713 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
714 it has been loaded at and the compile time physical addresses
715 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
716 setting can still be useful to bootwrappers that need to know the
717 load location of the kernel (eg. u-boot/mkimage).
719 config PAGE_OFFSET_BOOL
720 bool "Set custom page offset address"
721 depends on ADVANCED_OPTIONS
723 This option allows you to set the kernel virtual address at which
724 the kernel will map low memory. This can be useful in optimizing
725 the virtual memory layout of the system.
727 Say N here unless you know what you are doing.
730 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
733 config KERNEL_START_BOOL
734 bool "Set custom kernel base address"
735 depends on ADVANCED_OPTIONS
737 This option allows you to set the kernel virtual address at which
738 the kernel will be loaded. Normally this should match PAGE_OFFSET
739 however there are times (like kdump) that one might not want them
742 Say N here unless you know what you are doing.
745 hex "Virtual address of kernel base" if KERNEL_START_BOOL
746 default PAGE_OFFSET if PAGE_OFFSET_BOOL
747 default "0xc2000000" if CRASH_DUMP
750 config PHYSICAL_START_BOOL
751 bool "Set physical address where the kernel is loaded"
752 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
754 This gives the physical address where the kernel is loaded.
756 Say N here unless you know what you are doing.
758 config PHYSICAL_START
759 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
760 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
763 config PHYSICAL_ALIGN
765 default "0x10000000" if FSL_BOOKE
767 This value puts the alignment restrictions on physical address
768 where kernel is loaded and run from. Kernel is compiled for an
769 address which meets above alignment restriction.
771 config TASK_SIZE_BOOL
772 bool "Set custom user task size"
773 depends on ADVANCED_OPTIONS
775 This option allows you to set the amount of virtual address space
776 allocated to user tasks. This can be useful in optimizing the
777 virtual memory layout of the system.
779 Say N here unless you know what you are doing.
782 hex "Size of user task space" if TASK_SIZE_BOOL
783 default "0x80000000" if PPC_PREP || PPC_8xx
786 config CONSISTENT_START_BOOL
787 bool "Set custom consistent memory pool address"
788 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
790 This option allows you to set the base virtual address
791 of the consistent memory pool. This pool of virtual
792 memory is used to make consistent memory allocations.
794 config CONSISTENT_START
795 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
796 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
797 default "0xff100000" if NOT_COHERENT_CACHE
799 config CONSISTENT_SIZE_BOOL
800 bool "Set custom consistent memory pool size"
801 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
803 This option allows you to set the size of the
804 consistent memory pool. This pool of virtual memory
805 is used to make consistent memory allocations.
807 config CONSISTENT_SIZE
808 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
809 default "0x00200000" if NOT_COHERENT_CACHE
812 bool "Pinned Kernel TLBs (860 ONLY)"
813 depends on ADVANCED_OPTIONS && 8xx
818 bool "Build a relocatable kernel"
820 This builds a kernel image that is capable of running anywhere
821 in the RMA (real memory area) at any 16k-aligned base address.
822 The kernel is linked as a position-independent executable (PIE)
823 and contains dynamic relocations which are processed early
824 in the bootup process.
826 One use is for the kexec on panic case where the recovery kernel
827 must live at a different physical address than the primary
832 default "0xc000000000000000"
835 default "0xc000000002000000" if CRASH_DUMP
836 default "0xc000000000000000"
837 config PHYSICAL_START
839 default "0x02000000" if CRASH_DUMP
845 source "drivers/Kconfig"
849 # XXX source "arch/ppc/8xx_io/Kconfig"
851 # XXX source "arch/ppc/8260_io/Kconfig"
853 source "arch/powerpc/sysdev/qe_lib/Kconfig"
857 source "arch/powerpc/Kconfig.debug"
859 source "security/Kconfig"
863 depends on COMPAT && KEYS
866 source "crypto/Kconfig"
876 source "arch/powerpc/kvm/Kconfig"