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
100 config SYSVIPC_COMPAT
102 depends on COMPAT && SYSVIPC
105 # All PPC32s use generic nvram driver through ppc_md
110 config SCHED_NO_NO_OMIT_FRAME_POINTER
114 config ARCH_MAY_HAVE_PC_FDC
116 default !PPC_PSERIES || PCI
124 config PPC_UDBG_16550
128 config GENERIC_TBSYNC
130 default y if PPC32 && SMP
142 config SYS_SUPPORTS_APM_EMULATION
143 default y if PMAC_APM_EMU
146 config DEFAULT_UIMAGE
149 Used to allow a board to specify it wants a uImage built by default
157 depends on (PPC_PMAC && !SMP) || BROKEN
162 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
165 config ARCH_HIBERNATION_POSSIBLE
167 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
170 config ARCH_SUSPEND_POSSIBLE
172 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
174 config PPC_DCR_NATIVE
184 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
187 config PPC_OF_PLATFORM_PCI
190 depends on PPC64 # not supported on 32 bits yet
193 source "init/Kconfig"
195 source "arch/powerpc/sysdev/Kconfig"
196 source "arch/powerpc/platforms/Kconfig"
198 menu "Kernel options"
201 bool "High memory support"
204 source kernel/time/Kconfig
205 source kernel/Kconfig.hz
206 source kernel/Kconfig.preempt
207 source "fs/Kconfig.binfmt"
209 # We optimistically allocate largepages from the VM, so make the limit
210 # large enough (16MB). This badly named config option is actually
212 config FORCE_MAX_ZONEORDER
215 default "9" if PPC_64K_PAGES
218 config HUGETLB_PAGE_SIZE_VARIABLE
220 depends on HUGETLB_PAGE
223 config MATH_EMULATION
224 bool "Math emulation"
225 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
227 Some PowerPC chips designed for embedded applications do not have
228 a floating-point unit and therefore do not implement the
229 floating-point instructions in the PowerPC instruction set. If you
230 say Y here, the kernel will include code to emulate a floating-point
231 unit, which will allow programs that use floating-point
234 config 8XX_MINIMAL_FPEMU
235 bool "Minimal math emulation for 8xx"
236 depends on 8xx && !MATH_EMULATION
238 Older arch/ppc kernels still emulated a few floating point
239 instructions such as load and store, even when full math
240 emulation is disabled. Say "Y" here if you want to preserve
243 It is recommended that you build a soft-float userspace instead.
246 bool "Enable IOMMU virtual merging"
250 Cause IO segments sent to a device for DMA to be merged virtually
251 by the IOMMU when they happen to have been allocated contiguously.
252 This doesn't add pressure to the IOMMU allocator. However, some
253 drivers don't support getting large merged segments coming back
256 Most drivers don't have this problem; it is safe to say Y here.
259 bool "Support for enabling/disabling CPUs"
260 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
262 Say Y here to be able to disable and re-enable individual
263 CPUs at runtime on SMP machines.
265 Say N if you are unsure.
267 config ARCH_ENABLE_MEMORY_HOTPLUG
271 bool "kexec system call (EXPERIMENTAL)"
272 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
274 kexec is a system call that implements the ability to shutdown your
275 current kernel, and to start another kernel. It is like a reboot
276 but it is independent of the system firmware. And like a reboot
277 you can start any kernel with it, not just Linux.
279 The name comes from the similarity to the exec system call.
281 It is an ongoing process to be certain the hardware in a machine
282 is properly shutdown, so do not be surprised if this code does not
283 initially work for you. It may help to enable device hotplugging
284 support. As of this writing the exact hardware interface is
285 strongly in flux, so no good recommendation can be made.
288 bool "Build a kdump crash kernel (EXPERIMENTAL)"
289 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
291 Build a kernel suitable for use as a kdump capture kernel.
292 The kernel will be linked at a different address than normal, and
293 so can only be used for Kdump.
295 Don't change this unless you know what you are doing.
298 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
299 default y if PPC_PREP
302 bool "Distribute interrupts on all CPUs by default"
303 depends on SMP && !MV64360
305 This option gives the kernel permission to distribute IRQs across
306 multiple CPUs. Saying N here will route all IRQs to the first
307 CPU. Generally saying Y is safe, although some problems have been
308 reported with SMP Power Macintoshes with this option enabled.
313 default y if SMP && PPC_PSERIES
318 depends on NEED_MULTIPLE_NODES
320 config ARCH_SELECT_MEMORY_MODEL
324 config ARCH_FLATMEM_ENABLE
326 depends on (PPC64 && !NUMA) || PPC32
328 config ARCH_SPARSEMEM_ENABLE
331 select SPARSEMEM_VMEMMAP_ENABLE
333 config ARCH_SPARSEMEM_DEFAULT
335 depends on (SMP && PPC_PSERIES) || PPC_PS3
337 config ARCH_POPULATES_NODE_MAP
342 config ARCH_MEMORY_PROBE
344 depends on MEMORY_HOTPLUG
346 # Some NUMA nodes have memory ranges that span
347 # other nodes. Even though a pfn is valid and
348 # between a node's start and end pfns, it may not
349 # reside on that node. See memmap_init_zone()
351 config NODES_SPAN_OTHER_NODES
353 depends on NEED_MULTIPLE_NODES
355 config PPC_HAS_HASH_64K
363 select PPC_HAS_HASH_64K
365 This option changes the kernel logical page size to 64k. On machines
366 without processor support for 64k pages, the kernel will simulate
367 them by loading each individual 4k page on demand transparently,
368 while on hardware with such support, it will be used to map
369 normal application pages.
371 config PPC_SUBPAGE_PROT
372 bool "Support setting protections for 4k subpages"
373 depends on PPC_64K_PAGES
375 This option adds support for a system call to allow user programs
376 to set access permissions (read/write, readonly, or no access)
377 on the 4k subpages of each 64k page.
380 bool "SMT (Hyperthreading) scheduler support"
381 depends on PPC64 && SMP
383 SMT scheduler support improves the CPU scheduler's decision making
384 when dealing with POWER5 cpus at a cost of slightly increased
385 overhead in some places. If unsure say N here.
387 config PROC_DEVICETREE
388 bool "Support for device tree in /proc"
391 This option adds a device-tree directory under /proc which contains
392 an image of the device tree that the kernel copies from Open
393 Firmware or other boot firmware. If unsure, say Y here.
396 bool "Default bootloader kernel arguments"
399 string "Initial kernel command string"
400 depends on CMDLINE_BOOL
401 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
403 On some platforms, there is currently no way for the boot loader to
404 pass arguments to the kernel. For these platforms, you can supply
405 some command-line options at build time by entering them here. In
406 most cases you will need to specify the root device here.
409 config ARCH_WANTS_FREEZER_CONTROL
413 source kernel/power/Kconfig
417 bool "Enable seccomp to safely compute untrusted bytecode"
421 This kernel feature is useful for number crunching applications
422 that may need to compute untrusted bytecode during their
423 execution. By using pipes or other transports made available to
424 the process as file descriptors supporting the read/write
425 syscalls, it's possible to isolate those applications in
426 their own address space using seccomp. Once seccomp is
427 enabled via /proc/<pid>/seccomp, it cannot be disabled
428 and the task is only allowed to execute a few safe syscalls
429 defined by each seccomp mode.
431 If unsure, say Y. Only embedded should say N here.
433 config WANT_DEVICE_TREE
438 string "Static device tree source file"
439 depends on WANT_DEVICE_TREE
441 This specifies the device tree source (.dts) file to be
442 compiled and included when building the bootwrapper. If a
443 relative filename is given, then it will be relative to
444 arch/powerpc/boot/dts. If you are not using the bootwrapper,
445 or do not need to build a dts into the bootwrapper, this
448 For example, this is required when building a cuImage target
449 for an older U-Boot, which cannot pass a device tree itself.
450 Such a kernel will not work with a newer U-Boot that tries to
451 pass a device tree (unless you tell it not to). If your U-Boot
452 does not mention a device tree in "help bootm", then use the
453 cuImage target and specify a device tree here. Otherwise, use
454 the uImage target and leave this field blank.
460 default !PPC_ISERIES || PCI
465 bool "Support for ISA-bus hardware"
466 depends on PPC_PREP || PPC_CHRP
469 Find out whether you have ISA slots on your motherboard. ISA is the
470 name of a bus system, i.e. the way the CPU talks to the other stuff
471 inside your box. If you have an Apple machine, say N here; if you
472 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
473 you have an embedded board, consult your board documentation.
479 config GENERIC_ISA_DMA
481 depends on PPC64 || POWER4 || 6xx && !CPM2
484 config PPC_INDIRECT_PCI
487 default y if 40x || 44x
501 select PPC_INDIRECT_PCI
503 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
508 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
509 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
511 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
512 && !PPC_85xx && !PPC_86xx
513 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
514 default PCI_QSPAN if !4xx && !CPM2 && 8xx
515 select ARCH_SUPPORTS_MSI
517 Find out whether your system includes a PCI bus. PCI is the name of
518 a bus system, i.e. the way the CPU talks to the other stuff inside
519 your box. If you say Y here, the kernel will include drivers and
520 infrastructure code to support PCI bus devices.
530 depends on !4xx && !CPM2 && 8xx
533 Say Y here if you have a system based on a Motorola 8xx-series
534 embedded processor with a QSPAN PCI interface, otherwise say N.
538 depends on PCI && 8260
539 select PPC_INDIRECT_PCI
543 bool "Enable workaround for MPC826x erratum PCI 9"
544 depends on PCI_8260 && !8272
548 prompt "IDMA channel for PCI 9 workaround"
551 config 8260_PCI9_IDMA1
554 config 8260_PCI9_IDMA2
557 config 8260_PCI9_IDMA3
560 config 8260_PCI9_IDMA4
565 source "drivers/pci/pcie/Kconfig"
567 source "drivers/pci/Kconfig"
569 source "drivers/pcmcia/Kconfig"
571 source "drivers/pci/hotplug/Kconfig"
575 menu "Advanced setup"
578 config ADVANCED_OPTIONS
579 bool "Prompt for advanced kernel configuration options"
581 This option will enable prompting for a variety of advanced kernel
582 configuration options. These options can cause the kernel to not
583 work if they are set incorrectly, but can be used to optimize certain
584 aspects of kernel memory management.
586 Unless you know what you are doing, say N here.
588 comment "Default settings for advanced configuration options are used"
589 depends on !ADVANCED_OPTIONS
591 config HIGHMEM_START_BOOL
592 bool "Set high memory pool address"
593 depends on ADVANCED_OPTIONS && HIGHMEM
595 This option allows you to set the base address of the kernel virtual
596 area used to map high memory pages. This can be useful in
597 optimizing the layout of kernel virtual memory.
599 Say N here unless you know what you are doing.
602 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
605 config LOWMEM_SIZE_BOOL
606 bool "Set maximum low memory"
607 depends on ADVANCED_OPTIONS
609 This option allows you to set the maximum amount of memory which
610 will be used as "low memory", that is, memory which the kernel can
611 access directly, without having to set up a kernel virtual mapping.
612 This can be useful in optimizing the layout of kernel virtual
615 Say N here unless you know what you are doing.
618 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
621 config KERNEL_START_BOOL
622 bool "Set custom kernel base address"
623 depends on ADVANCED_OPTIONS
625 This option allows you to set the kernel virtual address at which
626 the kernel will map low memory (the kernel image will be linked at
627 this address). This can be useful in optimizing the virtual memory
628 layout of the system.
630 Say N here unless you know what you are doing.
633 hex "Virtual address of kernel base" if KERNEL_START_BOOL
636 config TASK_SIZE_BOOL
637 bool "Set custom user task size"
638 depends on ADVANCED_OPTIONS
640 This option allows you to set the amount of virtual address space
641 allocated to user tasks. This can be useful in optimizing the
642 virtual memory layout of the system.
644 Say N here unless you know what you are doing.
647 hex "Size of user task space" if TASK_SIZE_BOOL
648 default "0x80000000" if PPC_PREP || PPC_8xx
651 config CONSISTENT_START_BOOL
652 bool "Set custom consistent memory pool address"
653 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
655 This option allows you to set the base virtual address
656 of the consistent memory pool. This pool of virtual
657 memory is used to make consistent memory allocations.
659 config CONSISTENT_START
660 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
661 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
662 default "0xff100000" if NOT_COHERENT_CACHE
664 config CONSISTENT_SIZE_BOOL
665 bool "Set custom consistent memory pool size"
666 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
668 This option allows you to set the size of the
669 consistent memory pool. This pool of virtual memory
670 is used to make consistent memory allocations.
672 config CONSISTENT_SIZE
673 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
674 default "0x00200000" if NOT_COHERENT_CACHE
676 config BOOT_LOAD_BOOL
677 bool "Set the boot link/load address"
678 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
680 This option allows you to set the initial load address of the zImage
681 or zImage.initrd file. This can be useful if you are on a board
682 which has a small amount of memory.
684 Say N here unless you know what you are doing.
687 hex "Link/load address for booting" if BOOT_LOAD_BOOL
688 default "0x00400000" if 40x || 8xx || 8260
689 default "0x01000000" if 44x
693 bool "Pinned Kernel TLBs (860 ONLY)"
694 depends on ADVANCED_OPTIONS && 8xx
700 default "0xc000000000000000"
705 source "drivers/Kconfig"
709 # XXX source "arch/ppc/8xx_io/Kconfig"
711 # XXX source "arch/ppc/8260_io/Kconfig"
713 source "arch/powerpc/sysdev/qe_lib/Kconfig"
717 source "kernel/Kconfig.instrumentation"
719 source "arch/powerpc/Kconfig.debug"
721 source "security/Kconfig"
725 depends on COMPAT && KEYS
728 source "crypto/Kconfig"