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
84 config ARCH_NO_VIRT_TO_BUS
93 select HAVE_KRETPROBES
103 select COMPAT_BINFMT_ELF
105 config SYSVIPC_COMPAT
107 depends on COMPAT && SYSVIPC
110 # All PPC32s use generic nvram driver through ppc_md
115 config SCHED_NO_NO_OMIT_FRAME_POINTER
119 config ARCH_MAY_HAVE_PC_FDC
121 default !PPC_PSERIES || PCI
129 config PPC_UDBG_16550
133 config GENERIC_TBSYNC
135 default y if PPC32 && SMP
147 config SYS_SUPPORTS_APM_EMULATION
148 default y if PMAC_APM_EMU
151 config DEFAULT_UIMAGE
154 Used to allow a board to specify it wants a uImage built by default
162 depends on (PPC_PMAC && !SMP) || BROKEN
167 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
170 config ARCH_HIBERNATION_POSSIBLE
172 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
175 config ARCH_SUSPEND_POSSIBLE
177 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
179 config PPC_DCR_NATIVE
189 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
192 config PPC_OF_PLATFORM_PCI
195 depends on PPC64 # not supported on 32 bits yet
198 source "init/Kconfig"
200 source "arch/powerpc/sysdev/Kconfig"
201 source "arch/powerpc/platforms/Kconfig"
203 menu "Kernel options"
206 bool "High memory support"
209 source kernel/time/Kconfig
210 source kernel/Kconfig.hz
211 source kernel/Kconfig.preempt
212 source "fs/Kconfig.binfmt"
214 config HUGETLB_PAGE_SIZE_VARIABLE
216 depends on HUGETLB_PAGE
219 config MATH_EMULATION
220 bool "Math emulation"
221 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
223 Some PowerPC chips designed for embedded applications do not have
224 a floating-point unit and therefore do not implement the
225 floating-point instructions in the PowerPC instruction set. If you
226 say Y here, the kernel will include code to emulate a floating-point
227 unit, which will allow programs that use floating-point
230 config 8XX_MINIMAL_FPEMU
231 bool "Minimal math emulation for 8xx"
232 depends on 8xx && !MATH_EMULATION
234 Older arch/ppc kernels still emulated a few floating point
235 instructions such as load and store, even when full math
236 emulation is disabled. Say "Y" here if you want to preserve
239 It is recommended that you build a soft-float userspace instead.
242 bool "Enable IOMMU virtual merging"
246 Cause IO segments sent to a device for DMA to be merged virtually
247 by the IOMMU when they happen to have been allocated contiguously.
248 This doesn't add pressure to the IOMMU allocator. However, some
249 drivers don't support getting large merged segments coming back
252 Most drivers don't have this problem; it is safe to say Y here.
258 bool "Support for enabling/disabling CPUs"
259 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
261 Say Y here to be able to disable and re-enable individual
262 CPUs at runtime on SMP machines.
264 Say N if you are unsure.
266 config ARCH_ENABLE_MEMORY_HOTPLUG
269 config ARCH_HAS_WALK_MEMORY
272 config ARCH_ENABLE_MEMORY_HOTREMOVE
276 bool "kexec system call (EXPERIMENTAL)"
277 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
279 kexec is a system call that implements the ability to shutdown your
280 current kernel, and to start another kernel. It is like a reboot
281 but it is independent of the system firmware. And like a reboot
282 you can start any kernel with it, not just Linux.
284 The name comes from the similarity to the exec system call.
286 It is an ongoing process to be certain the hardware in a machine
287 is properly shutdown, so do not be surprised if this code does not
288 initially work for you. It may help to enable device hotplugging
289 support. As of this writing the exact hardware interface is
290 strongly in flux, so no good recommendation can be made.
293 bool "Build a kdump crash kernel (EXPERIMENTAL)"
294 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
296 Build a kernel suitable for use as a kdump capture kernel.
297 The kernel will be linked at a different address than normal, and
298 so can only be used for Kdump.
300 Don't change this unless you know what you are doing.
303 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
304 depends on PPC_PSERIES && EXPERIMENTAL
306 Hypervisor-assisted dump is meant to be a kdump replacement
307 offering robustness and speed not possible without system
308 hypervisor assistence.
313 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
314 default y if PPC_PREP
317 bool "Distribute interrupts on all CPUs by default"
318 depends on SMP && !MV64360
320 This option gives the kernel permission to distribute IRQs across
321 multiple CPUs. Saying N here will route all IRQs to the first
322 CPU. Generally saying Y is safe, although some problems have been
323 reported with SMP Power Macintoshes with this option enabled.
328 default y if SMP && PPC_PSERIES
333 depends on NEED_MULTIPLE_NODES
335 config ARCH_SELECT_MEMORY_MODEL
339 config ARCH_FLATMEM_ENABLE
341 depends on (PPC64 && !NUMA) || PPC32
343 config ARCH_SPARSEMEM_ENABLE
346 select SPARSEMEM_VMEMMAP_ENABLE
348 config ARCH_SPARSEMEM_DEFAULT
350 depends on (SMP && PPC_PSERIES) || PPC_PS3
352 config ARCH_POPULATES_NODE_MAP
357 config ARCH_MEMORY_PROBE
359 depends on MEMORY_HOTPLUG
361 # Some NUMA nodes have memory ranges that span
362 # other nodes. Even though a pfn is valid and
363 # between a node's start and end pfns, it may not
364 # reside on that node. See memmap_init_zone()
366 config NODES_SPAN_OTHER_NODES
368 depends on NEED_MULTIPLE_NODES
370 config PPC_HAS_HASH_64K
378 select PPC_HAS_HASH_64K
380 This option changes the kernel logical page size to 64k. On machines
381 without processor support for 64k pages, the kernel will simulate
382 them by loading each individual 4k page on demand transparently,
383 while on hardware with such support, it will be used to map
384 normal application pages.
386 config FORCE_MAX_ZONEORDER
387 int "Maximum zone order"
388 default "9" if PPC_64K_PAGES
389 default "13" if PPC64 && !PPC_64K_PAGES
392 The kernel memory allocator divides physically contiguous memory
393 blocks into "zones", where each zone is a power of two number of
394 pages. This option selects the largest power of two that the kernel
395 keeps in the memory allocator. If you need to allocate very large
396 blocks of physically contiguous memory, then you may need to
399 This config option is actually maximum order plus one. For example,
400 a value of 11 means that the largest free memory block is 2^10 pages.
402 The page size is not necessarily 4KB. For example, on 64-bit
403 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
404 this in mind when choosing a value for this option.
406 config PPC_SUBPAGE_PROT
407 bool "Support setting protections for 4k subpages"
408 depends on PPC_64K_PAGES
410 This option adds support for a system call to allow user programs
411 to set access permissions (read/write, readonly, or no access)
412 on the 4k subpages of each 64k page.
415 bool "SMT (Hyperthreading) scheduler support"
416 depends on PPC64 && SMP
418 SMT scheduler support improves the CPU scheduler's decision making
419 when dealing with POWER5 cpus at a cost of slightly increased
420 overhead in some places. If unsure say N here.
422 config PROC_DEVICETREE
423 bool "Support for device tree in /proc"
426 This option adds a device-tree directory under /proc which contains
427 an image of the device tree that the kernel copies from Open
428 Firmware or other boot firmware. If unsure, say Y here.
431 bool "Default bootloader kernel arguments"
434 string "Initial kernel command string"
435 depends on CMDLINE_BOOL
436 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
438 On some platforms, there is currently no way for the boot loader to
439 pass arguments to the kernel. For these platforms, you can supply
440 some command-line options at build time by entering them here. In
441 most cases you will need to specify the root device here.
444 config ARCH_WANTS_FREEZER_CONTROL
448 source kernel/power/Kconfig
452 bool "Enable seccomp to safely compute untrusted bytecode"
456 This kernel feature is useful for number crunching applications
457 that may need to compute untrusted bytecode during their
458 execution. By using pipes or other transports made available to
459 the process as file descriptors supporting the read/write
460 syscalls, it's possible to isolate those applications in
461 their own address space using seccomp. Once seccomp is
462 enabled via /proc/<pid>/seccomp, it cannot be disabled
463 and the task is only allowed to execute a few safe syscalls
464 defined by each seccomp mode.
466 If unsure, say Y. Only embedded should say N here.
472 default !PPC_ISERIES || PCI
477 bool "Support for ISA-bus hardware"
478 depends on PPC_PREP || PPC_CHRP
481 Find out whether you have ISA slots on your motherboard. ISA is the
482 name of a bus system, i.e. the way the CPU talks to the other stuff
483 inside your box. If you have an Apple machine, say N here; if you
484 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
485 you have an embedded board, consult your board documentation.
491 config GENERIC_ISA_DMA
493 depends on PPC64 || POWER4 || 6xx && !CPM2
496 config PPC_INDIRECT_PCI
499 default y if 40x || 44x
513 select PPC_INDIRECT_PCI
518 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
523 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
524 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
526 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
527 && !PPC_85xx && !PPC_86xx
528 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
529 default PCI_QSPAN if !4xx && !CPM2 && 8xx
530 select ARCH_SUPPORTS_MSI
532 Find out whether your system includes a PCI bus. PCI is the name of
533 a bus system, i.e. the way the CPU talks to the other stuff inside
534 your box. If you say Y here, the kernel will include drivers and
535 infrastructure code to support PCI bus devices.
545 depends on !4xx && !CPM2 && 8xx
548 Say Y here if you have a system based on a Motorola 8xx-series
549 embedded processor with a QSPAN PCI interface, otherwise say N.
553 depends on PCI && 8260
554 select PPC_INDIRECT_PCI
558 bool "Enable workaround for MPC826x erratum PCI 9"
559 depends on PCI_8260 && !8272
563 prompt "IDMA channel for PCI 9 workaround"
566 config 8260_PCI9_IDMA1
569 config 8260_PCI9_IDMA2
572 config 8260_PCI9_IDMA3
575 config 8260_PCI9_IDMA4
580 source "drivers/pci/pcie/Kconfig"
582 source "drivers/pci/Kconfig"
584 source "drivers/pcmcia/Kconfig"
586 source "drivers/pci/hotplug/Kconfig"
590 menu "Advanced setup"
593 config ADVANCED_OPTIONS
594 bool "Prompt for advanced kernel configuration options"
596 This option will enable prompting for a variety of advanced kernel
597 configuration options. These options can cause the kernel to not
598 work if they are set incorrectly, but can be used to optimize certain
599 aspects of kernel memory management.
601 Unless you know what you are doing, say N here.
603 comment "Default settings for advanced configuration options are used"
604 depends on !ADVANCED_OPTIONS
606 config HIGHMEM_START_BOOL
607 bool "Set high memory pool address"
608 depends on ADVANCED_OPTIONS && HIGHMEM
610 This option allows you to set the base address of the kernel virtual
611 area used to map high memory pages. This can be useful in
612 optimizing the layout of kernel virtual memory.
614 Say N here unless you know what you are doing.
617 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
620 config LOWMEM_SIZE_BOOL
621 bool "Set maximum low memory"
622 depends on ADVANCED_OPTIONS
624 This option allows you to set the maximum amount of memory which
625 will be used as "low memory", that is, memory which the kernel can
626 access directly, without having to set up a kernel virtual mapping.
627 This can be useful in optimizing the layout of kernel virtual
630 Say N here unless you know what you are doing.
633 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
636 config KERNEL_START_BOOL
637 bool "Set custom kernel base address"
638 depends on ADVANCED_OPTIONS
640 This option allows you to set the kernel virtual address at which
641 the kernel will map low memory (the kernel image will be linked at
642 this address). This can be useful in optimizing the virtual memory
643 layout of the system.
645 Say N here unless you know what you are doing.
648 hex "Virtual address of kernel base" if KERNEL_START_BOOL
651 config TASK_SIZE_BOOL
652 bool "Set custom user task size"
653 depends on ADVANCED_OPTIONS
655 This option allows you to set the amount of virtual address space
656 allocated to user tasks. This can be useful in optimizing the
657 virtual memory layout of the system.
659 Say N here unless you know what you are doing.
662 hex "Size of user task space" if TASK_SIZE_BOOL
663 default "0x80000000" if PPC_PREP || PPC_8xx
666 config CONSISTENT_START_BOOL
667 bool "Set custom consistent memory pool address"
668 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
670 This option allows you to set the base virtual address
671 of the consistent memory pool. This pool of virtual
672 memory is used to make consistent memory allocations.
674 config CONSISTENT_START
675 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
676 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
677 default "0xff100000" if NOT_COHERENT_CACHE
679 config CONSISTENT_SIZE_BOOL
680 bool "Set custom consistent memory pool size"
681 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
683 This option allows you to set the size of the
684 consistent memory pool. This pool of virtual memory
685 is used to make consistent memory allocations.
687 config CONSISTENT_SIZE
688 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
689 default "0x00200000" if NOT_COHERENT_CACHE
691 config BOOT_LOAD_BOOL
692 bool "Set the boot link/load address"
693 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
695 This option allows you to set the initial load address of the zImage
696 or zImage.initrd file. This can be useful if you are on a board
697 which has a small amount of memory.
699 Say N here unless you know what you are doing.
702 hex "Link/load address for booting" if BOOT_LOAD_BOOL
703 default "0x00400000" if 40x || 8xx || 8260
704 default "0x01000000" if 44x
708 bool "Pinned Kernel TLBs (860 ONLY)"
709 depends on ADVANCED_OPTIONS && 8xx
715 default "0xc000000000000000"
720 source "drivers/Kconfig"
724 # XXX source "arch/ppc/8xx_io/Kconfig"
726 # XXX source "arch/ppc/8260_io/Kconfig"
728 source "arch/powerpc/sysdev/qe_lib/Kconfig"
732 source "arch/powerpc/Kconfig.debug"
734 source "security/Kconfig"
738 depends on COMPAT && KEYS
741 source "crypto/Kconfig"