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 RWSEM_GENERIC_SPINLOCK
59 config RWSEM_XCHGADD_ALGORITHM
63 config GENERIC_LOCKBREAK
66 depends on SMP && PREEMPT
68 config ARCH_HAS_ILOG2_U32
72 config ARCH_HAS_ILOG2_U64
76 config GENERIC_HWEIGHT
80 config GENERIC_CALIBRATE_DELAY
84 config GENERIC_FIND_NEXT_BIT
91 Generic GPIO API support
93 config ARCH_NO_VIRT_TO_BUS
102 select HAVE_KRETPROBES
112 select COMPAT_BINFMT_ELF
114 config SYSVIPC_COMPAT
116 depends on COMPAT && SYSVIPC
119 # All PPC32s use generic nvram driver through ppc_md
124 config SCHED_NO_NO_OMIT_FRAME_POINTER
128 config ARCH_MAY_HAVE_PC_FDC
130 default !PPC_PSERIES || PCI
138 config PPC_UDBG_16550
142 config GENERIC_TBSYNC
144 default y if PPC32 && SMP
156 config SYS_SUPPORTS_APM_EMULATION
157 default y if PMAC_APM_EMU
160 config DEFAULT_UIMAGE
163 Used to allow a board to specify it wants a uImage built by default
171 depends on (PPC_PMAC && !SMP) || BROKEN
176 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
179 config ARCH_HIBERNATION_POSSIBLE
181 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
184 config ARCH_SUSPEND_POSSIBLE
186 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
188 config PPC_DCR_NATIVE
198 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
201 config PPC_OF_PLATFORM_PCI
204 depends on PPC64 # not supported on 32 bits yet
207 source "init/Kconfig"
209 source "arch/powerpc/sysdev/Kconfig"
210 source "arch/powerpc/platforms/Kconfig"
212 menu "Kernel options"
215 bool "High memory support"
218 source kernel/time/Kconfig
219 source kernel/Kconfig.hz
220 source kernel/Kconfig.preempt
221 source "fs/Kconfig.binfmt"
223 config HUGETLB_PAGE_SIZE_VARIABLE
225 depends on HUGETLB_PAGE
228 config MATH_EMULATION
229 bool "Math emulation"
230 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
232 Some PowerPC chips designed for embedded applications do not have
233 a floating-point unit and therefore do not implement the
234 floating-point instructions in the PowerPC instruction set. If you
235 say Y here, the kernel will include code to emulate a floating-point
236 unit, which will allow programs that use floating-point
239 config 8XX_MINIMAL_FPEMU
240 bool "Minimal math emulation for 8xx"
241 depends on 8xx && !MATH_EMULATION
243 Older arch/ppc kernels still emulated a few floating point
244 instructions such as load and store, even when full math
245 emulation is disabled. Say "Y" here if you want to preserve
248 It is recommended that you build a soft-float userspace instead.
251 bool "Enable IOMMU virtual merging"
255 Cause IO segments sent to a device for DMA to be merged virtually
256 by the IOMMU when they happen to have been allocated contiguously.
257 This doesn't add pressure to the IOMMU allocator. However, some
258 drivers don't support getting large merged segments coming back
261 Most drivers don't have this problem; it is safe to say Y here.
267 bool "Support for enabling/disabling CPUs"
268 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
270 Say Y here to be able to disable and re-enable individual
271 CPUs at runtime on SMP machines.
273 Say N if you are unsure.
275 config ARCH_ENABLE_MEMORY_HOTPLUG
278 config ARCH_HAS_WALK_MEMORY
281 config ARCH_ENABLE_MEMORY_HOTREMOVE
285 bool "kexec system call (EXPERIMENTAL)"
286 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
288 kexec is a system call that implements the ability to shutdown your
289 current kernel, and to start another kernel. It is like a reboot
290 but it is independent of the system firmware. And like a reboot
291 you can start any kernel with it, not just Linux.
293 The name comes from the similarity to the exec system call.
295 It is an ongoing process to be certain the hardware in a machine
296 is properly shutdown, so do not be surprised if this code does not
297 initially work for you. It may help to enable device hotplugging
298 support. As of this writing the exact hardware interface is
299 strongly in flux, so no good recommendation can be made.
302 bool "Build a kdump crash kernel (EXPERIMENTAL)"
303 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
305 Build a kernel suitable for use as a kdump capture kernel.
306 The kernel will be linked at a different address than normal, and
307 so can only be used for Kdump.
309 Don't change this unless you know what you are doing.
312 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
313 depends on PPC_PSERIES && EXPERIMENTAL
315 Hypervisor-assisted dump is meant to be a kdump replacement
316 offering robustness and speed not possible without system
317 hypervisor assistence.
322 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
323 default y if PPC_PREP
326 bool "Distribute interrupts on all CPUs by default"
327 depends on SMP && !MV64360
329 This option gives the kernel permission to distribute IRQs across
330 multiple CPUs. Saying N here will route all IRQs to the first
331 CPU. Generally saying Y is safe, although some problems have been
332 reported with SMP Power Macintoshes with this option enabled.
337 default y if SMP && PPC_PSERIES
342 depends on NEED_MULTIPLE_NODES
344 config ARCH_SELECT_MEMORY_MODEL
348 config ARCH_FLATMEM_ENABLE
350 depends on (PPC64 && !NUMA) || PPC32
352 config ARCH_SPARSEMEM_ENABLE
355 select SPARSEMEM_VMEMMAP_ENABLE
357 config ARCH_SPARSEMEM_DEFAULT
359 depends on (SMP && PPC_PSERIES) || PPC_PS3
361 config ARCH_POPULATES_NODE_MAP
366 config ARCH_MEMORY_PROBE
368 depends on MEMORY_HOTPLUG
370 # Some NUMA nodes have memory ranges that span
371 # other nodes. Even though a pfn is valid and
372 # between a node's start and end pfns, it may not
373 # reside on that node. See memmap_init_zone()
375 config NODES_SPAN_OTHER_NODES
377 depends on NEED_MULTIPLE_NODES
379 config PPC_HAS_HASH_64K
387 select PPC_HAS_HASH_64K
389 This option changes the kernel logical page size to 64k. On machines
390 without processor support for 64k pages, the kernel will simulate
391 them by loading each individual 4k page on demand transparently,
392 while on hardware with such support, it will be used to map
393 normal application pages.
395 config FORCE_MAX_ZONEORDER
396 int "Maximum zone order"
397 default "9" if PPC_64K_PAGES
398 default "13" if PPC64 && !PPC_64K_PAGES
401 The kernel memory allocator divides physically contiguous memory
402 blocks into "zones", where each zone is a power of two number of
403 pages. This option selects the largest power of two that the kernel
404 keeps in the memory allocator. If you need to allocate very large
405 blocks of physically contiguous memory, then you may need to
408 This config option is actually maximum order plus one. For example,
409 a value of 11 means that the largest free memory block is 2^10 pages.
411 The page size is not necessarily 4KB. For example, on 64-bit
412 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
413 this in mind when choosing a value for this option.
415 config PPC_SUBPAGE_PROT
416 bool "Support setting protections for 4k subpages"
417 depends on PPC_64K_PAGES
419 This option adds support for a system call to allow user programs
420 to set access permissions (read/write, readonly, or no access)
421 on the 4k subpages of each 64k page.
424 bool "SMT (Hyperthreading) scheduler support"
425 depends on PPC64 && SMP
427 SMT scheduler support improves the CPU scheduler's decision making
428 when dealing with POWER5 cpus at a cost of slightly increased
429 overhead in some places. If unsure say N here.
431 config PROC_DEVICETREE
432 bool "Support for device tree in /proc"
435 This option adds a device-tree directory under /proc which contains
436 an image of the device tree that the kernel copies from Open
437 Firmware or other boot firmware. If unsure, say Y here.
440 bool "Default bootloader kernel arguments"
443 string "Initial kernel command string"
444 depends on CMDLINE_BOOL
445 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
447 On some platforms, there is currently no way for the boot loader to
448 pass arguments to the kernel. For these platforms, you can supply
449 some command-line options at build time by entering them here. In
450 most cases you will need to specify the root device here.
453 config ARCH_WANTS_FREEZER_CONTROL
457 source kernel/power/Kconfig
461 bool "Enable seccomp to safely compute untrusted bytecode"
465 This kernel feature is useful for number crunching applications
466 that may need to compute untrusted bytecode during their
467 execution. By using pipes or other transports made available to
468 the process as file descriptors supporting the read/write
469 syscalls, it's possible to isolate those applications in
470 their own address space using seccomp. Once seccomp is
471 enabled via /proc/<pid>/seccomp, it cannot be disabled
472 and the task is only allowed to execute a few safe syscalls
473 defined by each seccomp mode.
475 If unsure, say Y. Only embedded should say N here.
481 default !PPC_ISERIES || PCI
486 bool "Support for ISA-bus hardware"
487 depends on PPC_PREP || PPC_CHRP
490 Find out whether you have ISA slots on your motherboard. ISA is the
491 name of a bus system, i.e. the way the CPU talks to the other stuff
492 inside your box. If you have an Apple machine, say N here; if you
493 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
494 you have an embedded board, consult your board documentation.
500 config GENERIC_ISA_DMA
502 depends on PPC64 || POWER4 || 6xx && !CPM2
505 config PPC_INDIRECT_PCI
508 default y if 40x || 44x
522 select PPC_INDIRECT_PCI
530 Freescale Localbus support
532 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
537 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
538 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
540 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
541 && !PPC_85xx && !PPC_86xx
542 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
543 default PCI_QSPAN if !4xx && !CPM2 && 8xx
544 select ARCH_SUPPORTS_MSI
546 Find out whether your system includes a PCI bus. PCI is the name of
547 a bus system, i.e. the way the CPU talks to the other stuff inside
548 your box. If you say Y here, the kernel will include drivers and
549 infrastructure code to support PCI bus devices.
559 depends on !4xx && !CPM2 && 8xx
562 Say Y here if you have a system based on a Motorola 8xx-series
563 embedded processor with a QSPAN PCI interface, otherwise say N.
567 depends on PCI && 8260
568 select PPC_INDIRECT_PCI
572 bool "Enable workaround for MPC826x erratum PCI 9"
573 depends on PCI_8260 && !8272
577 prompt "IDMA channel for PCI 9 workaround"
580 config 8260_PCI9_IDMA1
583 config 8260_PCI9_IDMA2
586 config 8260_PCI9_IDMA3
589 config 8260_PCI9_IDMA4
594 source "drivers/pci/pcie/Kconfig"
596 source "drivers/pci/Kconfig"
598 source "drivers/pcmcia/Kconfig"
600 source "drivers/pci/hotplug/Kconfig"
604 menu "Advanced setup"
607 config ADVANCED_OPTIONS
608 bool "Prompt for advanced kernel configuration options"
610 This option will enable prompting for a variety of advanced kernel
611 configuration options. These options can cause the kernel to not
612 work if they are set incorrectly, but can be used to optimize certain
613 aspects of kernel memory management.
615 Unless you know what you are doing, say N here.
617 comment "Default settings for advanced configuration options are used"
618 depends on !ADVANCED_OPTIONS
620 config HIGHMEM_START_BOOL
621 bool "Set high memory pool address"
622 depends on ADVANCED_OPTIONS && HIGHMEM
624 This option allows you to set the base address of the kernel virtual
625 area used to map high memory pages. This can be useful in
626 optimizing the layout of kernel virtual memory.
628 Say N here unless you know what you are doing.
631 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
634 config LOWMEM_SIZE_BOOL
635 bool "Set maximum low memory"
636 depends on ADVANCED_OPTIONS
638 This option allows you to set the maximum amount of memory which
639 will be used as "low memory", that is, memory which the kernel can
640 access directly, without having to set up a kernel virtual mapping.
641 This can be useful in optimizing the layout of kernel virtual
644 Say N here unless you know what you are doing.
647 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
650 config KERNEL_START_BOOL
651 bool "Set custom kernel base address"
652 depends on ADVANCED_OPTIONS
654 This option allows you to set the kernel virtual address at which
655 the kernel will map low memory (the kernel image will be linked at
656 this address). This can be useful in optimizing the virtual memory
657 layout of the system.
659 Say N here unless you know what you are doing.
662 hex "Virtual address of kernel base" if KERNEL_START_BOOL
665 config TASK_SIZE_BOOL
666 bool "Set custom user task size"
667 depends on ADVANCED_OPTIONS
669 This option allows you to set the amount of virtual address space
670 allocated to user tasks. This can be useful in optimizing the
671 virtual memory layout of the system.
673 Say N here unless you know what you are doing.
676 hex "Size of user task space" if TASK_SIZE_BOOL
677 default "0x80000000" if PPC_PREP || PPC_8xx
680 config CONSISTENT_START_BOOL
681 bool "Set custom consistent memory pool address"
682 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
684 This option allows you to set the base virtual address
685 of the consistent memory pool. This pool of virtual
686 memory is used to make consistent memory allocations.
688 config CONSISTENT_START
689 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
690 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
691 default "0xff100000" if NOT_COHERENT_CACHE
693 config CONSISTENT_SIZE_BOOL
694 bool "Set custom consistent memory pool size"
695 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
697 This option allows you to set the size of the
698 consistent memory pool. This pool of virtual memory
699 is used to make consistent memory allocations.
701 config CONSISTENT_SIZE
702 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
703 default "0x00200000" if NOT_COHERENT_CACHE
706 bool "Pinned Kernel TLBs (860 ONLY)"
707 depends on ADVANCED_OPTIONS && 8xx
713 default "0xc000000000000000"
718 source "drivers/Kconfig"
722 # XXX source "arch/ppc/8xx_io/Kconfig"
724 # XXX source "arch/ppc/8260_io/Kconfig"
726 source "arch/powerpc/sysdev/qe_lib/Kconfig"
730 source "arch/powerpc/Kconfig.debug"
732 source "security/Kconfig"
736 depends on COMPAT && KEYS
739 source "crypto/Kconfig"