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 # We optimistically allocate largepages from the VM, so make the limit
215 # large enough (16MB). This badly named config option is actually
217 config FORCE_MAX_ZONEORDER
220 default "9" if PPC_64K_PAGES
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 PPC_SUBPAGE_PROT
396 bool "Support setting protections for 4k subpages"
397 depends on PPC_64K_PAGES
399 This option adds support for a system call to allow user programs
400 to set access permissions (read/write, readonly, or no access)
401 on the 4k subpages of each 64k page.
404 bool "SMT (Hyperthreading) scheduler support"
405 depends on PPC64 && SMP
407 SMT scheduler support improves the CPU scheduler's decision making
408 when dealing with POWER5 cpus at a cost of slightly increased
409 overhead in some places. If unsure say N here.
411 config PROC_DEVICETREE
412 bool "Support for device tree in /proc"
415 This option adds a device-tree directory under /proc which contains
416 an image of the device tree that the kernel copies from Open
417 Firmware or other boot firmware. If unsure, say Y here.
420 bool "Default bootloader kernel arguments"
423 string "Initial kernel command string"
424 depends on CMDLINE_BOOL
425 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
427 On some platforms, there is currently no way for the boot loader to
428 pass arguments to the kernel. For these platforms, you can supply
429 some command-line options at build time by entering them here. In
430 most cases you will need to specify the root device here.
433 config ARCH_WANTS_FREEZER_CONTROL
437 source kernel/power/Kconfig
441 bool "Enable seccomp to safely compute untrusted bytecode"
445 This kernel feature is useful for number crunching applications
446 that may need to compute untrusted bytecode during their
447 execution. By using pipes or other transports made available to
448 the process as file descriptors supporting the read/write
449 syscalls, it's possible to isolate those applications in
450 their own address space using seccomp. Once seccomp is
451 enabled via /proc/<pid>/seccomp, it cannot be disabled
452 and the task is only allowed to execute a few safe syscalls
453 defined by each seccomp mode.
455 If unsure, say Y. Only embedded should say N here.
461 default !PPC_ISERIES || PCI
466 bool "Support for ISA-bus hardware"
467 depends on PPC_PREP || PPC_CHRP
470 Find out whether you have ISA slots on your motherboard. ISA is the
471 name of a bus system, i.e. the way the CPU talks to the other stuff
472 inside your box. If you have an Apple machine, say N here; if you
473 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
474 you have an embedded board, consult your board documentation.
480 config GENERIC_ISA_DMA
482 depends on PPC64 || POWER4 || 6xx && !CPM2
485 config PPC_INDIRECT_PCI
488 default y if 40x || 44x
502 select PPC_INDIRECT_PCI
504 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
509 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
510 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
512 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
513 && !PPC_85xx && !PPC_86xx
514 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
515 default PCI_QSPAN if !4xx && !CPM2 && 8xx
516 select ARCH_SUPPORTS_MSI
518 Find out whether your system includes a PCI bus. PCI is the name of
519 a bus system, i.e. the way the CPU talks to the other stuff inside
520 your box. If you say Y here, the kernel will include drivers and
521 infrastructure code to support PCI bus devices.
531 depends on !4xx && !CPM2 && 8xx
534 Say Y here if you have a system based on a Motorola 8xx-series
535 embedded processor with a QSPAN PCI interface, otherwise say N.
539 depends on PCI && 8260
540 select PPC_INDIRECT_PCI
544 bool "Enable workaround for MPC826x erratum PCI 9"
545 depends on PCI_8260 && !8272
549 prompt "IDMA channel for PCI 9 workaround"
552 config 8260_PCI9_IDMA1
555 config 8260_PCI9_IDMA2
558 config 8260_PCI9_IDMA3
561 config 8260_PCI9_IDMA4
566 source "drivers/pci/pcie/Kconfig"
568 source "drivers/pci/Kconfig"
570 source "drivers/pcmcia/Kconfig"
572 source "drivers/pci/hotplug/Kconfig"
576 menu "Advanced setup"
579 config ADVANCED_OPTIONS
580 bool "Prompt for advanced kernel configuration options"
582 This option will enable prompting for a variety of advanced kernel
583 configuration options. These options can cause the kernel to not
584 work if they are set incorrectly, but can be used to optimize certain
585 aspects of kernel memory management.
587 Unless you know what you are doing, say N here.
589 comment "Default settings for advanced configuration options are used"
590 depends on !ADVANCED_OPTIONS
592 config HIGHMEM_START_BOOL
593 bool "Set high memory pool address"
594 depends on ADVANCED_OPTIONS && HIGHMEM
596 This option allows you to set the base address of the kernel virtual
597 area used to map high memory pages. This can be useful in
598 optimizing the layout of kernel virtual memory.
600 Say N here unless you know what you are doing.
603 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
606 config LOWMEM_SIZE_BOOL
607 bool "Set maximum low memory"
608 depends on ADVANCED_OPTIONS
610 This option allows you to set the maximum amount of memory which
611 will be used as "low memory", that is, memory which the kernel can
612 access directly, without having to set up a kernel virtual mapping.
613 This can be useful in optimizing the layout of kernel virtual
616 Say N here unless you know what you are doing.
619 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
622 config KERNEL_START_BOOL
623 bool "Set custom kernel base address"
624 depends on ADVANCED_OPTIONS
626 This option allows you to set the kernel virtual address at which
627 the kernel will map low memory (the kernel image will be linked at
628 this address). This can be useful in optimizing the virtual memory
629 layout of the system.
631 Say N here unless you know what you are doing.
634 hex "Virtual address of kernel base" if KERNEL_START_BOOL
637 config TASK_SIZE_BOOL
638 bool "Set custom user task size"
639 depends on ADVANCED_OPTIONS
641 This option allows you to set the amount of virtual address space
642 allocated to user tasks. This can be useful in optimizing the
643 virtual memory layout of the system.
645 Say N here unless you know what you are doing.
648 hex "Size of user task space" if TASK_SIZE_BOOL
649 default "0x80000000" if PPC_PREP || PPC_8xx
652 config CONSISTENT_START_BOOL
653 bool "Set custom consistent memory pool address"
654 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
656 This option allows you to set the base virtual address
657 of the consistent memory pool. This pool of virtual
658 memory is used to make consistent memory allocations.
660 config CONSISTENT_START
661 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
662 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
663 default "0xff100000" if NOT_COHERENT_CACHE
665 config CONSISTENT_SIZE_BOOL
666 bool "Set custom consistent memory pool size"
667 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
669 This option allows you to set the size of the
670 consistent memory pool. This pool of virtual memory
671 is used to make consistent memory allocations.
673 config CONSISTENT_SIZE
674 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
675 default "0x00200000" if NOT_COHERENT_CACHE
677 config BOOT_LOAD_BOOL
678 bool "Set the boot link/load address"
679 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
681 This option allows you to set the initial load address of the zImage
682 or zImage.initrd file. This can be useful if you are on a board
683 which has a small amount of memory.
685 Say N here unless you know what you are doing.
688 hex "Link/load address for booting" if BOOT_LOAD_BOOL
689 default "0x00400000" if 40x || 8xx || 8260
690 default "0x01000000" if 44x
694 bool "Pinned Kernel TLBs (860 ONLY)"
695 depends on ADVANCED_OPTIONS && 8xx
701 default "0xc000000000000000"
706 source "drivers/Kconfig"
710 # XXX source "arch/ppc/8xx_io/Kconfig"
712 # XXX source "arch/ppc/8260_io/Kconfig"
714 source "arch/powerpc/sysdev/qe_lib/Kconfig"
718 source "arch/powerpc/Kconfig.debug"
720 source "security/Kconfig"
724 depends on COMPAT && KEYS
727 source "crypto/Kconfig"