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
101 config SYSVIPC_COMPAT
103 depends on COMPAT && SYSVIPC
106 # All PPC32s use generic nvram driver through ppc_md
111 config SCHED_NO_NO_OMIT_FRAME_POINTER
115 config ARCH_MAY_HAVE_PC_FDC
117 default !PPC_PSERIES || PCI
125 config PPC_UDBG_16550
129 config GENERIC_TBSYNC
131 default y if PPC32 && SMP
143 config SYS_SUPPORTS_APM_EMULATION
144 default y if PMAC_APM_EMU
147 config DEFAULT_UIMAGE
150 Used to allow a board to specify it wants a uImage built by default
158 depends on (PPC_PMAC && !SMP) || BROKEN
163 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
166 config ARCH_HIBERNATION_POSSIBLE
168 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
171 config ARCH_SUSPEND_POSSIBLE
173 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
175 config PPC_DCR_NATIVE
185 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
188 config PPC_OF_PLATFORM_PCI
191 depends on PPC64 # not supported on 32 bits yet
194 source "init/Kconfig"
196 source "arch/powerpc/sysdev/Kconfig"
197 source "arch/powerpc/platforms/Kconfig"
199 menu "Kernel options"
202 bool "High memory support"
205 source kernel/time/Kconfig
206 source kernel/Kconfig.hz
207 source kernel/Kconfig.preempt
208 source "fs/Kconfig.binfmt"
210 # We optimistically allocate largepages from the VM, so make the limit
211 # large enough (16MB). This badly named config option is actually
213 config FORCE_MAX_ZONEORDER
216 default "9" if PPC_64K_PAGES
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
275 bool "kexec system call (EXPERIMENTAL)"
276 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
278 kexec is a system call that implements the ability to shutdown your
279 current kernel, and to start another kernel. It is like a reboot
280 but it is independent of the system firmware. And like a reboot
281 you can start any kernel with it, not just Linux.
283 The name comes from the similarity to the exec system call.
285 It is an ongoing process to be certain the hardware in a machine
286 is properly shutdown, so do not be surprised if this code does not
287 initially work for you. It may help to enable device hotplugging
288 support. As of this writing the exact hardware interface is
289 strongly in flux, so no good recommendation can be made.
292 bool "Build a kdump crash kernel (EXPERIMENTAL)"
293 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
295 Build a kernel suitable for use as a kdump capture kernel.
296 The kernel will be linked at a different address than normal, and
297 so can only be used for Kdump.
299 Don't change this unless you know what you are doing.
302 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
303 default y if PPC_PREP
306 bool "Distribute interrupts on all CPUs by default"
307 depends on SMP && !MV64360
309 This option gives the kernel permission to distribute IRQs across
310 multiple CPUs. Saying N here will route all IRQs to the first
311 CPU. Generally saying Y is safe, although some problems have been
312 reported with SMP Power Macintoshes with this option enabled.
317 default y if SMP && PPC_PSERIES
322 depends on NEED_MULTIPLE_NODES
324 config ARCH_SELECT_MEMORY_MODEL
328 config ARCH_FLATMEM_ENABLE
330 depends on (PPC64 && !NUMA) || PPC32
332 config ARCH_SPARSEMEM_ENABLE
335 select SPARSEMEM_VMEMMAP_ENABLE
337 config ARCH_SPARSEMEM_DEFAULT
339 depends on (SMP && PPC_PSERIES) || PPC_PS3
341 config ARCH_POPULATES_NODE_MAP
346 config ARCH_MEMORY_PROBE
348 depends on MEMORY_HOTPLUG
350 # Some NUMA nodes have memory ranges that span
351 # other nodes. Even though a pfn is valid and
352 # between a node's start and end pfns, it may not
353 # reside on that node. See memmap_init_zone()
355 config NODES_SPAN_OTHER_NODES
357 depends on NEED_MULTIPLE_NODES
359 config PPC_HAS_HASH_64K
367 select PPC_HAS_HASH_64K
369 This option changes the kernel logical page size to 64k. On machines
370 without processor support for 64k pages, the kernel will simulate
371 them by loading each individual 4k page on demand transparently,
372 while on hardware with such support, it will be used to map
373 normal application pages.
375 config PPC_SUBPAGE_PROT
376 bool "Support setting protections for 4k subpages"
377 depends on PPC_64K_PAGES
379 This option adds support for a system call to allow user programs
380 to set access permissions (read/write, readonly, or no access)
381 on the 4k subpages of each 64k page.
384 bool "SMT (Hyperthreading) scheduler support"
385 depends on PPC64 && SMP
387 SMT scheduler support improves the CPU scheduler's decision making
388 when dealing with POWER5 cpus at a cost of slightly increased
389 overhead in some places. If unsure say N here.
391 config PROC_DEVICETREE
392 bool "Support for device tree in /proc"
395 This option adds a device-tree directory under /proc which contains
396 an image of the device tree that the kernel copies from Open
397 Firmware or other boot firmware. If unsure, say Y here.
400 bool "Default bootloader kernel arguments"
403 string "Initial kernel command string"
404 depends on CMDLINE_BOOL
405 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
407 On some platforms, there is currently no way for the boot loader to
408 pass arguments to the kernel. For these platforms, you can supply
409 some command-line options at build time by entering them here. In
410 most cases you will need to specify the root device here.
413 config ARCH_WANTS_FREEZER_CONTROL
417 source kernel/power/Kconfig
421 bool "Enable seccomp to safely compute untrusted bytecode"
425 This kernel feature is useful for number crunching applications
426 that may need to compute untrusted bytecode during their
427 execution. By using pipes or other transports made available to
428 the process as file descriptors supporting the read/write
429 syscalls, it's possible to isolate those applications in
430 their own address space using seccomp. Once seccomp is
431 enabled via /proc/<pid>/seccomp, it cannot be disabled
432 and the task is only allowed to execute a few safe syscalls
433 defined by each seccomp mode.
435 If unsure, say Y. Only embedded should say N here.
437 config WANT_DEVICE_TREE
442 string "Static device tree source file"
443 depends on WANT_DEVICE_TREE
445 This specifies the device tree source (.dts) file to be
446 compiled and included when building the bootwrapper. If a
447 relative filename is given, then it will be relative to
448 arch/powerpc/boot/dts. If you are not using the bootwrapper,
449 or do not need to build a dts into the bootwrapper, this
452 For example, this is required when building a cuImage target
453 for an older U-Boot, which cannot pass a device tree itself.
454 Such a kernel will not work with a newer U-Boot that tries to
455 pass a device tree (unless you tell it not to). If your U-Boot
456 does not mention a device tree in "help bootm", then use the
457 cuImage target and specify a device tree here. Otherwise, use
458 the uImage target and leave this field blank.
464 default !PPC_ISERIES || PCI
469 bool "Support for ISA-bus hardware"
470 depends on PPC_PREP || PPC_CHRP
473 Find out whether you have ISA slots on your motherboard. ISA is the
474 name of a bus system, i.e. the way the CPU talks to the other stuff
475 inside your box. If you have an Apple machine, say N here; if you
476 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
477 you have an embedded board, consult your board documentation.
483 config GENERIC_ISA_DMA
485 depends on PPC64 || POWER4 || 6xx && !CPM2
488 config PPC_INDIRECT_PCI
491 default y if 40x || 44x
505 select PPC_INDIRECT_PCI
507 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
512 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
513 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
515 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
516 && !PPC_85xx && !PPC_86xx
517 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
518 default PCI_QSPAN if !4xx && !CPM2 && 8xx
519 select ARCH_SUPPORTS_MSI
521 Find out whether your system includes a PCI bus. PCI is the name of
522 a bus system, i.e. the way the CPU talks to the other stuff inside
523 your box. If you say Y here, the kernel will include drivers and
524 infrastructure code to support PCI bus devices.
534 depends on !4xx && !CPM2 && 8xx
537 Say Y here if you have a system based on a Motorola 8xx-series
538 embedded processor with a QSPAN PCI interface, otherwise say N.
542 depends on PCI && 8260
543 select PPC_INDIRECT_PCI
547 bool "Enable workaround for MPC826x erratum PCI 9"
548 depends on PCI_8260 && !8272
552 prompt "IDMA channel for PCI 9 workaround"
555 config 8260_PCI9_IDMA1
558 config 8260_PCI9_IDMA2
561 config 8260_PCI9_IDMA3
564 config 8260_PCI9_IDMA4
569 source "drivers/pci/pcie/Kconfig"
571 source "drivers/pci/Kconfig"
573 source "drivers/pcmcia/Kconfig"
575 source "drivers/pci/hotplug/Kconfig"
579 menu "Advanced setup"
582 config ADVANCED_OPTIONS
583 bool "Prompt for advanced kernel configuration options"
585 This option will enable prompting for a variety of advanced kernel
586 configuration options. These options can cause the kernel to not
587 work if they are set incorrectly, but can be used to optimize certain
588 aspects of kernel memory management.
590 Unless you know what you are doing, say N here.
592 comment "Default settings for advanced configuration options are used"
593 depends on !ADVANCED_OPTIONS
595 config HIGHMEM_START_BOOL
596 bool "Set high memory pool address"
597 depends on ADVANCED_OPTIONS && HIGHMEM
599 This option allows you to set the base address of the kernel virtual
600 area used to map high memory pages. This can be useful in
601 optimizing the layout of kernel virtual memory.
603 Say N here unless you know what you are doing.
606 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
609 config LOWMEM_SIZE_BOOL
610 bool "Set maximum low memory"
611 depends on ADVANCED_OPTIONS
613 This option allows you to set the maximum amount of memory which
614 will be used as "low memory", that is, memory which the kernel can
615 access directly, without having to set up a kernel virtual mapping.
616 This can be useful in optimizing the layout of kernel virtual
619 Say N here unless you know what you are doing.
622 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
625 config KERNEL_START_BOOL
626 bool "Set custom kernel base address"
627 depends on ADVANCED_OPTIONS
629 This option allows you to set the kernel virtual address at which
630 the kernel will map low memory (the kernel image will be linked at
631 this address). This can be useful in optimizing the virtual memory
632 layout of the system.
634 Say N here unless you know what you are doing.
637 hex "Virtual address of kernel base" if KERNEL_START_BOOL
640 config TASK_SIZE_BOOL
641 bool "Set custom user task size"
642 depends on ADVANCED_OPTIONS
644 This option allows you to set the amount of virtual address space
645 allocated to user tasks. This can be useful in optimizing the
646 virtual memory layout of the system.
648 Say N here unless you know what you are doing.
651 hex "Size of user task space" if TASK_SIZE_BOOL
652 default "0x80000000" if PPC_PREP || PPC_8xx
655 config CONSISTENT_START_BOOL
656 bool "Set custom consistent memory pool address"
657 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
659 This option allows you to set the base virtual address
660 of the consistent memory pool. This pool of virtual
661 memory is used to make consistent memory allocations.
663 config CONSISTENT_START
664 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
665 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
666 default "0xff100000" if NOT_COHERENT_CACHE
668 config CONSISTENT_SIZE_BOOL
669 bool "Set custom consistent memory pool size"
670 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
672 This option allows you to set the size of the
673 consistent memory pool. This pool of virtual memory
674 is used to make consistent memory allocations.
676 config CONSISTENT_SIZE
677 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
678 default "0x00200000" if NOT_COHERENT_CACHE
680 config BOOT_LOAD_BOOL
681 bool "Set the boot link/load address"
682 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
684 This option allows you to set the initial load address of the zImage
685 or zImage.initrd file. This can be useful if you are on a board
686 which has a small amount of memory.
688 Say N here unless you know what you are doing.
691 hex "Link/load address for booting" if BOOT_LOAD_BOOL
692 default "0x00400000" if 40x || 8xx || 8260
693 default "0x01000000" if 44x
697 bool "Pinned Kernel TLBs (860 ONLY)"
698 depends on ADVANCED_OPTIONS && 8xx
704 default "0xc000000000000000"
709 source "drivers/Kconfig"
713 # XXX source "arch/ppc/8xx_io/Kconfig"
715 # XXX source "arch/ppc/8260_io/Kconfig"
717 source "arch/powerpc/sysdev/qe_lib/Kconfig"
721 source "arch/powerpc/Kconfig.debug"
723 source "security/Kconfig"
727 depends on COMPAT && KEYS
730 source "crypto/Kconfig"