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 RWSEM_GENERIC_SPINLOCK
55 config RWSEM_XCHGADD_ALGORITHM
59 config GENERIC_LOCKBREAK
62 depends on SMP && PREEMPT
64 config ARCH_HAS_ILOG2_U32
68 config ARCH_HAS_ILOG2_U64
72 config GENERIC_HWEIGHT
76 config GENERIC_CALIBRATE_DELAY
80 config GENERIC_FIND_NEXT_BIT
87 Generic GPIO API support
89 config ARCH_NO_VIRT_TO_BUS
98 select HAVE_KRETPROBES
108 select COMPAT_BINFMT_ELF
110 config SYSVIPC_COMPAT
112 depends on COMPAT && SYSVIPC
115 # All PPC32s use generic nvram driver through ppc_md
120 config SCHED_NO_NO_OMIT_FRAME_POINTER
124 config ARCH_MAY_HAVE_PC_FDC
126 default !PPC_PSERIES || PCI
134 config PPC_UDBG_16550
138 config GENERIC_TBSYNC
140 default y if PPC32 && SMP
152 config SYS_SUPPORTS_APM_EMULATION
153 default y if PMAC_APM_EMU
156 config DEFAULT_UIMAGE
159 Used to allow a board to specify it wants a uImage built by default
167 depends on (PPC_PMAC && !SMP) || BROKEN
172 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
175 config ARCH_HIBERNATION_POSSIBLE
177 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
180 config ARCH_SUSPEND_POSSIBLE
182 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
184 config PPC_DCR_NATIVE
194 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
197 config PPC_OF_PLATFORM_PCI
200 depends on PPC64 # not supported on 32 bits yet
203 source "init/Kconfig"
205 source "arch/powerpc/sysdev/Kconfig"
206 source "arch/powerpc/platforms/Kconfig"
208 menu "Kernel options"
211 bool "High memory support"
214 source kernel/time/Kconfig
215 source kernel/Kconfig.hz
216 source kernel/Kconfig.preempt
217 source "fs/Kconfig.binfmt"
219 config HUGETLB_PAGE_SIZE_VARIABLE
221 depends on HUGETLB_PAGE
224 config MATH_EMULATION
225 bool "Math emulation"
226 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
228 Some PowerPC chips designed for embedded applications do not have
229 a floating-point unit and therefore do not implement the
230 floating-point instructions in the PowerPC instruction set. If you
231 say Y here, the kernel will include code to emulate a floating-point
232 unit, which will allow programs that use floating-point
235 config 8XX_MINIMAL_FPEMU
236 bool "Minimal math emulation for 8xx"
237 depends on 8xx && !MATH_EMULATION
239 Older arch/ppc kernels still emulated a few floating point
240 instructions such as load and store, even when full math
241 emulation is disabled. Say "Y" here if you want to preserve
244 It is recommended that you build a soft-float userspace instead.
247 bool "Enable IOMMU virtual merging"
251 Cause IO segments sent to a device for DMA to be merged virtually
252 by the IOMMU when they happen to have been allocated contiguously.
253 This doesn't add pressure to the IOMMU allocator. However, some
254 drivers don't support getting large merged segments coming back
257 Most drivers don't have this problem; it is safe to say Y here.
263 bool "Support for enabling/disabling CPUs"
264 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
266 Say Y here to be able to disable and re-enable individual
267 CPUs at runtime on SMP machines.
269 Say N if you are unsure.
271 config ARCH_ENABLE_MEMORY_HOTPLUG
274 config ARCH_HAS_WALK_MEMORY
277 config ARCH_ENABLE_MEMORY_HOTREMOVE
281 bool "kexec system call (EXPERIMENTAL)"
282 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
284 kexec is a system call that implements the ability to shutdown your
285 current kernel, and to start another kernel. It is like a reboot
286 but it is independent of the system firmware. And like a reboot
287 you can start any kernel with it, not just Linux.
289 The name comes from the similarity to the exec system call.
291 It is an ongoing process to be certain the hardware in a machine
292 is properly shutdown, so do not be surprised if this code does not
293 initially work for you. It may help to enable device hotplugging
294 support. As of this writing the exact hardware interface is
295 strongly in flux, so no good recommendation can be made.
298 bool "Build a kdump crash kernel (EXPERIMENTAL)"
299 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
301 Build a kernel suitable for use as a kdump capture kernel.
302 The kernel will be linked at a different address than normal, and
303 so can only be used for Kdump.
305 Don't change this unless you know what you are doing.
308 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
309 depends on PPC_PSERIES && EXPERIMENTAL
311 Hypervisor-assisted dump is meant to be a kdump replacement
312 offering robustness and speed not possible without system
313 hypervisor assistence.
318 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
319 default y if PPC_PREP
322 bool "Distribute interrupts on all CPUs by default"
323 depends on SMP && !MV64360
325 This option gives the kernel permission to distribute IRQs across
326 multiple CPUs. Saying N here will route all IRQs to the first
327 CPU. Generally saying Y is safe, although some problems have been
328 reported with SMP Power Macintoshes with this option enabled.
333 default y if SMP && PPC_PSERIES
338 depends on NEED_MULTIPLE_NODES
340 config ARCH_SELECT_MEMORY_MODEL
344 config ARCH_FLATMEM_ENABLE
346 depends on (PPC64 && !NUMA) || PPC32
348 config ARCH_SPARSEMEM_ENABLE
351 select SPARSEMEM_VMEMMAP_ENABLE
353 config ARCH_SPARSEMEM_DEFAULT
355 depends on (SMP && PPC_PSERIES) || PPC_PS3
357 config ARCH_POPULATES_NODE_MAP
362 config ARCH_MEMORY_PROBE
364 depends on MEMORY_HOTPLUG
366 # Some NUMA nodes have memory ranges that span
367 # other nodes. Even though a pfn is valid and
368 # between a node's start and end pfns, it may not
369 # reside on that node. See memmap_init_zone()
371 config NODES_SPAN_OTHER_NODES
373 depends on NEED_MULTIPLE_NODES
375 config PPC_HAS_HASH_64K
383 select PPC_HAS_HASH_64K
385 This option changes the kernel logical page size to 64k. On machines
386 without processor support for 64k pages, the kernel will simulate
387 them by loading each individual 4k page on demand transparently,
388 while on hardware with such support, it will be used to map
389 normal application pages.
391 config FORCE_MAX_ZONEORDER
392 int "Maximum zone order"
393 default "9" if PPC_64K_PAGES
394 default "13" if PPC64 && !PPC_64K_PAGES
397 The kernel memory allocator divides physically contiguous memory
398 blocks into "zones", where each zone is a power of two number of
399 pages. This option selects the largest power of two that the kernel
400 keeps in the memory allocator. If you need to allocate very large
401 blocks of physically contiguous memory, then you may need to
404 This config option is actually maximum order plus one. For example,
405 a value of 11 means that the largest free memory block is 2^10 pages.
407 The page size is not necessarily 4KB. For example, on 64-bit
408 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
409 this in mind when choosing a value for this option.
411 config PPC_SUBPAGE_PROT
412 bool "Support setting protections for 4k subpages"
413 depends on PPC_64K_PAGES
415 This option adds support for a system call to allow user programs
416 to set access permissions (read/write, readonly, or no access)
417 on the 4k subpages of each 64k page.
420 bool "SMT (Hyperthreading) scheduler support"
421 depends on PPC64 && SMP
423 SMT scheduler support improves the CPU scheduler's decision making
424 when dealing with POWER5 cpus at a cost of slightly increased
425 overhead in some places. If unsure say N here.
427 config PROC_DEVICETREE
428 bool "Support for device tree in /proc"
431 This option adds a device-tree directory under /proc which contains
432 an image of the device tree that the kernel copies from Open
433 Firmware or other boot firmware. If unsure, say Y here.
436 bool "Default bootloader kernel arguments"
439 string "Initial kernel command string"
440 depends on CMDLINE_BOOL
441 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
443 On some platforms, there is currently no way for the boot loader to
444 pass arguments to the kernel. For these platforms, you can supply
445 some command-line options at build time by entering them here. In
446 most cases you will need to specify the root device here.
449 config ARCH_WANTS_FREEZER_CONTROL
453 source kernel/power/Kconfig
457 bool "Enable seccomp to safely compute untrusted bytecode"
461 This kernel feature is useful for number crunching applications
462 that may need to compute untrusted bytecode during their
463 execution. By using pipes or other transports made available to
464 the process as file descriptors supporting the read/write
465 syscalls, it's possible to isolate those applications in
466 their own address space using seccomp. Once seccomp is
467 enabled via /proc/<pid>/seccomp, it cannot be disabled
468 and the task is only allowed to execute a few safe syscalls
469 defined by each seccomp mode.
471 If unsure, say Y. Only embedded should say N here.
477 default !PPC_ISERIES || PCI
482 bool "Support for ISA-bus hardware"
483 depends on PPC_PREP || PPC_CHRP
486 Find out whether you have ISA slots on your motherboard. ISA is the
487 name of a bus system, i.e. the way the CPU talks to the other stuff
488 inside your box. If you have an Apple machine, say N here; if you
489 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
490 you have an embedded board, consult your board documentation.
496 config GENERIC_ISA_DMA
498 depends on PPC64 || POWER4 || 6xx && !CPM2
501 config PPC_INDIRECT_PCI
504 default y if 40x || 44x
518 select PPC_INDIRECT_PCI
526 Freescale Localbus support
528 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
533 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
534 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
536 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
537 && !PPC_85xx && !PPC_86xx
538 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
539 default PCI_QSPAN if !4xx && !CPM2 && 8xx
540 select ARCH_SUPPORTS_MSI
542 Find out whether your system includes a PCI bus. PCI is the name of
543 a bus system, i.e. the way the CPU talks to the other stuff inside
544 your box. If you say Y here, the kernel will include drivers and
545 infrastructure code to support PCI bus devices.
555 depends on !4xx && !CPM2 && 8xx
558 Say Y here if you have a system based on a Motorola 8xx-series
559 embedded processor with a QSPAN PCI interface, otherwise say N.
563 depends on PCI && 8260
564 select PPC_INDIRECT_PCI
568 bool "Enable workaround for MPC826x erratum PCI 9"
569 depends on PCI_8260 && !8272
573 prompt "IDMA channel for PCI 9 workaround"
576 config 8260_PCI9_IDMA1
579 config 8260_PCI9_IDMA2
582 config 8260_PCI9_IDMA3
585 config 8260_PCI9_IDMA4
590 source "drivers/pci/pcie/Kconfig"
592 source "drivers/pci/Kconfig"
594 source "drivers/pcmcia/Kconfig"
596 source "drivers/pci/hotplug/Kconfig"
600 menu "Advanced setup"
603 config ADVANCED_OPTIONS
604 bool "Prompt for advanced kernel configuration options"
606 This option will enable prompting for a variety of advanced kernel
607 configuration options. These options can cause the kernel to not
608 work if they are set incorrectly, but can be used to optimize certain
609 aspects of kernel memory management.
611 Unless you know what you are doing, say N here.
613 comment "Default settings for advanced configuration options are used"
614 depends on !ADVANCED_OPTIONS
616 config HIGHMEM_START_BOOL
617 bool "Set high memory pool address"
618 depends on ADVANCED_OPTIONS && HIGHMEM
620 This option allows you to set the base address of the kernel virtual
621 area used to map high memory pages. This can be useful in
622 optimizing the layout of kernel virtual memory.
624 Say N here unless you know what you are doing.
627 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
630 config LOWMEM_SIZE_BOOL
631 bool "Set maximum low memory"
632 depends on ADVANCED_OPTIONS
634 This option allows you to set the maximum amount of memory which
635 will be used as "low memory", that is, memory which the kernel can
636 access directly, without having to set up a kernel virtual mapping.
637 This can be useful in optimizing the layout of kernel virtual
640 Say N here unless you know what you are doing.
643 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
646 config KERNEL_START_BOOL
647 bool "Set custom kernel base address"
648 depends on ADVANCED_OPTIONS
650 This option allows you to set the kernel virtual address at which
651 the kernel will map low memory (the kernel image will be linked at
652 this address). This can be useful in optimizing the virtual memory
653 layout of the system.
655 Say N here unless you know what you are doing.
658 hex "Virtual address of kernel base" if KERNEL_START_BOOL
661 config TASK_SIZE_BOOL
662 bool "Set custom user task size"
663 depends on ADVANCED_OPTIONS
665 This option allows you to set the amount of virtual address space
666 allocated to user tasks. This can be useful in optimizing the
667 virtual memory layout of the system.
669 Say N here unless you know what you are doing.
672 hex "Size of user task space" if TASK_SIZE_BOOL
673 default "0x80000000" if PPC_PREP || PPC_8xx
676 config CONSISTENT_START_BOOL
677 bool "Set custom consistent memory pool address"
678 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
680 This option allows you to set the base virtual address
681 of the consistent memory pool. This pool of virtual
682 memory is used to make consistent memory allocations.
684 config CONSISTENT_START
685 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
686 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
687 default "0xff100000" if NOT_COHERENT_CACHE
689 config CONSISTENT_SIZE_BOOL
690 bool "Set custom consistent memory pool size"
691 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
693 This option allows you to set the size of the
694 consistent memory pool. This pool of virtual memory
695 is used to make consistent memory allocations.
697 config CONSISTENT_SIZE
698 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
699 default "0x00200000" if NOT_COHERENT_CACHE
702 bool "Pinned Kernel TLBs (860 ONLY)"
703 depends on ADVANCED_OPTIONS && 8xx
709 default "0xc000000000000000"
714 source "drivers/Kconfig"
718 # XXX source "arch/ppc/8xx_io/Kconfig"
720 # XXX source "arch/ppc/8260_io/Kconfig"
722 source "arch/powerpc/sysdev/qe_lib/Kconfig"
726 source "arch/powerpc/Kconfig.debug"
728 source "security/Kconfig"
732 depends on COMPAT && KEYS
735 source "crypto/Kconfig"