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 depends on COMPAT && SYSVIPC
104 # All PPC32s use generic nvram driver through ppc_md
109 config SCHED_NO_NO_OMIT_FRAME_POINTER
113 config ARCH_MAY_HAVE_PC_FDC
115 default !PPC_PSERIES || PCI
123 config PPC_UDBG_16550
127 config GENERIC_TBSYNC
129 default y if PPC32 && SMP
141 config SYS_SUPPORTS_APM_EMULATION
142 default y if PMAC_APM_EMU
145 config DEFAULT_UIMAGE
148 Used to allow a board to specify it wants a uImage built by default
156 depends on (PPC_PMAC && !SMP) || BROKEN
161 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
164 config ARCH_HIBERNATION_POSSIBLE
166 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
169 config ARCH_SUSPEND_POSSIBLE
171 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
173 config PPC_DCR_NATIVE
183 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
186 config PPC_OF_PLATFORM_PCI
189 depends on PPC64 # not supported on 32 bits yet
192 source "init/Kconfig"
194 source "arch/powerpc/sysdev/Kconfig"
195 source "arch/powerpc/platforms/Kconfig"
197 menu "Kernel options"
200 bool "High memory support"
203 source kernel/time/Kconfig
204 source kernel/Kconfig.hz
205 source kernel/Kconfig.preempt
206 source "fs/Kconfig.binfmt"
208 # We optimistically allocate largepages from the VM, so make the limit
209 # large enough (16MB). This badly named config option is actually
211 config FORCE_MAX_ZONEORDER
214 default "9" if PPC_64K_PAGES
217 config HUGETLB_PAGE_SIZE_VARIABLE
219 depends on HUGETLB_PAGE
222 config MATH_EMULATION
223 bool "Math emulation"
224 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
226 Some PowerPC chips designed for embedded applications do not have
227 a floating-point unit and therefore do not implement the
228 floating-point instructions in the PowerPC instruction set. If you
229 say Y here, the kernel will include code to emulate a floating-point
230 unit, which will allow programs that use floating-point
233 config 8XX_MINIMAL_FPEMU
234 bool "Minimal math emulation for 8xx"
235 depends on 8xx && !MATH_EMULATION
237 Older arch/ppc kernels still emulated a few floating point
238 instructions such as load and store, even when full math
239 emulation is disabled. Say "Y" here if you want to preserve
242 It is recommended that you build a soft-float userspace instead.
245 bool "Enable IOMMU virtual merging"
249 Cause IO segments sent to a device for DMA to be merged virtually
250 by the IOMMU when they happen to have been allocated contiguously.
251 This doesn't add pressure to the IOMMU allocator. However, some
252 drivers don't support getting large merged segments coming back
255 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
270 bool "kexec system call (EXPERIMENTAL)"
271 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
273 kexec is a system call that implements the ability to shutdown your
274 current kernel, and to start another kernel. It is like a reboot
275 but it is independent of the system firmware. And like a reboot
276 you can start any kernel with it, not just Linux.
278 The name comes from the similarity to the exec system call.
280 It is an ongoing process to be certain the hardware in a machine
281 is properly shutdown, so do not be surprised if this code does not
282 initially work for you. It may help to enable device hotplugging
283 support. As of this writing the exact hardware interface is
284 strongly in flux, so no good recommendation can be made.
287 bool "Build a kdump crash kernel (EXPERIMENTAL)"
288 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
290 Build a kernel suitable for use as a kdump capture kernel.
291 The kernel will be linked at a different address than normal, and
292 so can only be used for Kdump.
294 Don't change this unless you know what you are doing.
297 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
298 default y if PPC_PREP
301 bool "Distribute interrupts on all CPUs by default"
302 depends on SMP && !MV64360
304 This option gives the kernel permission to distribute IRQs across
305 multiple CPUs. Saying N here will route all IRQs to the first
306 CPU. Generally saying Y is safe, although some problems have been
307 reported with SMP Power Macintoshes with this option enabled.
312 default y if SMP && PPC_PSERIES
317 depends on NEED_MULTIPLE_NODES
319 config ARCH_SELECT_MEMORY_MODEL
323 config ARCH_FLATMEM_ENABLE
325 depends on (PPC64 && !NUMA) || PPC32
327 config ARCH_SPARSEMEM_ENABLE
330 select SPARSEMEM_VMEMMAP_ENABLE
332 config ARCH_SPARSEMEM_DEFAULT
334 depends on (SMP && PPC_PSERIES) || PPC_PS3
336 config ARCH_POPULATES_NODE_MAP
341 config ARCH_MEMORY_PROBE
343 depends on MEMORY_HOTPLUG
345 # Some NUMA nodes have memory ranges that span
346 # other nodes. Even though a pfn is valid and
347 # between a node's start and end pfns, it may not
348 # reside on that node. See memmap_init_zone()
350 config NODES_SPAN_OTHER_NODES
352 depends on NEED_MULTIPLE_NODES
354 config PPC_HAS_HASH_64K
362 select PPC_HAS_HASH_64K
364 This option changes the kernel logical page size to 64k. On machines
365 without processor support for 64k pages, the kernel will simulate
366 them by loading each individual 4k page on demand transparently,
367 while on hardware with such support, it will be used to map
368 normal application pages.
370 config PPC_SUBPAGE_PROT
371 bool "Support setting protections for 4k subpages"
372 depends on PPC_64K_PAGES
374 This option adds support for a system call to allow user programs
375 to set access permissions (read/write, readonly, or no access)
376 on the 4k subpages of each 64k page.
379 bool "SMT (Hyperthreading) scheduler support"
380 depends on PPC64 && SMP
382 SMT scheduler support improves the CPU scheduler's decision making
383 when dealing with POWER5 cpus at a cost of slightly increased
384 overhead in some places. If unsure say N here.
386 config PROC_DEVICETREE
387 bool "Support for device tree in /proc"
390 This option adds a device-tree directory under /proc which contains
391 an image of the device tree that the kernel copies from Open
392 Firmware or other boot firmware. If unsure, say Y here.
395 bool "Default bootloader kernel arguments"
398 string "Initial kernel command string"
399 depends on CMDLINE_BOOL
400 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
402 On some platforms, there is currently no way for the boot loader to
403 pass arguments to the kernel. For these platforms, you can supply
404 some command-line options at build time by entering them here. In
405 most cases you will need to specify the root device here.
408 config ARCH_WANTS_FREEZER_CONTROL
412 source kernel/power/Kconfig
416 bool "Enable seccomp to safely compute untrusted bytecode"
420 This kernel feature is useful for number crunching applications
421 that may need to compute untrusted bytecode during their
422 execution. By using pipes or other transports made available to
423 the process as file descriptors supporting the read/write
424 syscalls, it's possible to isolate those applications in
425 their own address space using seccomp. Once seccomp is
426 enabled via /proc/<pid>/seccomp, it cannot be disabled
427 and the task is only allowed to execute a few safe syscalls
428 defined by each seccomp mode.
430 If unsure, say Y. Only embedded should say N here.
432 config WANT_DEVICE_TREE
437 string "Static device tree source file"
438 depends on WANT_DEVICE_TREE
440 This specifies the device tree source (.dts) file to be
441 compiled and included when building the bootwrapper. If a
442 relative filename is given, then it will be relative to
443 arch/powerpc/boot/dts. If you are not using the bootwrapper,
444 or do not need to build a dts into the bootwrapper, this
447 For example, this is required when building a cuImage target
448 for an older U-Boot, which cannot pass a device tree itself.
449 Such a kernel will not work with a newer U-Boot that tries to
450 pass a device tree (unless you tell it not to). If your U-Boot
451 does not mention a device tree in "help bootm", then use the
452 cuImage target and specify a device tree here. Otherwise, use
453 the uImage target and leave this field blank.
459 default !PPC_ISERIES || PCI
464 bool "Support for ISA-bus hardware"
465 depends on PPC_PREP || PPC_CHRP
468 Find out whether you have ISA slots on your motherboard. ISA is the
469 name of a bus system, i.e. the way the CPU talks to the other stuff
470 inside your box. If you have an Apple machine, say N here; if you
471 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
472 you have an embedded board, consult your board documentation.
478 config GENERIC_ISA_DMA
480 depends on PPC64 || POWER4 || 6xx && !CPM2
483 config PPC_INDIRECT_PCI
486 default y if 40x || 44x
500 select PPC_INDIRECT_PCI
502 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
507 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
508 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
510 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
511 && !PPC_85xx && !PPC_86xx
512 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
513 default PCI_QSPAN if !4xx && !CPM2 && 8xx
514 select ARCH_SUPPORTS_MSI
516 Find out whether your system includes a PCI bus. PCI is the name of
517 a bus system, i.e. the way the CPU talks to the other stuff inside
518 your box. If you say Y here, the kernel will include drivers and
519 infrastructure code to support PCI bus devices.
529 depends on !4xx && !CPM2 && 8xx
532 Say Y here if you have a system based on a Motorola 8xx-series
533 embedded processor with a QSPAN PCI interface, otherwise say N.
537 depends on PCI && 8260
538 select PPC_INDIRECT_PCI
542 bool "Enable workaround for MPC826x erratum PCI 9"
543 depends on PCI_8260 && !8272
547 prompt "IDMA channel for PCI 9 workaround"
550 config 8260_PCI9_IDMA1
553 config 8260_PCI9_IDMA2
556 config 8260_PCI9_IDMA3
559 config 8260_PCI9_IDMA4
564 source "drivers/pci/pcie/Kconfig"
566 source "drivers/pci/Kconfig"
568 source "drivers/pcmcia/Kconfig"
570 source "drivers/pci/hotplug/Kconfig"
574 menu "Advanced setup"
577 config ADVANCED_OPTIONS
578 bool "Prompt for advanced kernel configuration options"
580 This option will enable prompting for a variety of advanced kernel
581 configuration options. These options can cause the kernel to not
582 work if they are set incorrectly, but can be used to optimize certain
583 aspects of kernel memory management.
585 Unless you know what you are doing, say N here.
587 comment "Default settings for advanced configuration options are used"
588 depends on !ADVANCED_OPTIONS
590 config HIGHMEM_START_BOOL
591 bool "Set high memory pool address"
592 depends on ADVANCED_OPTIONS && HIGHMEM
594 This option allows you to set the base address of the kernel virtual
595 area used to map high memory pages. This can be useful in
596 optimizing the layout of kernel virtual memory.
598 Say N here unless you know what you are doing.
601 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
604 config LOWMEM_SIZE_BOOL
605 bool "Set maximum low memory"
606 depends on ADVANCED_OPTIONS
608 This option allows you to set the maximum amount of memory which
609 will be used as "low memory", that is, memory which the kernel can
610 access directly, without having to set up a kernel virtual mapping.
611 This can be useful in optimizing the layout of kernel virtual
614 Say N here unless you know what you are doing.
617 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
620 config KERNEL_START_BOOL
621 bool "Set custom kernel base address"
622 depends on ADVANCED_OPTIONS
624 This option allows you to set the kernel virtual address at which
625 the kernel will map low memory (the kernel image will be linked at
626 this address). This can be useful in optimizing the virtual memory
627 layout of the system.
629 Say N here unless you know what you are doing.
632 hex "Virtual address of kernel base" if KERNEL_START_BOOL
635 config TASK_SIZE_BOOL
636 bool "Set custom user task size"
637 depends on ADVANCED_OPTIONS
639 This option allows you to set the amount of virtual address space
640 allocated to user tasks. This can be useful in optimizing the
641 virtual memory layout of the system.
643 Say N here unless you know what you are doing.
646 hex "Size of user task space" if TASK_SIZE_BOOL
647 default "0x80000000" if PPC_PREP || PPC_8xx
650 config CONSISTENT_START_BOOL
651 bool "Set custom consistent memory pool address"
652 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
654 This option allows you to set the base virtual address
655 of the consistent memory pool. This pool of virtual
656 memory is used to make consistent memory allocations.
658 config CONSISTENT_START
659 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
660 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
661 default "0xff100000" if NOT_COHERENT_CACHE
663 config CONSISTENT_SIZE_BOOL
664 bool "Set custom consistent memory pool size"
665 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
667 This option allows you to set the size of the
668 consistent memory pool. This pool of virtual memory
669 is used to make consistent memory allocations.
671 config CONSISTENT_SIZE
672 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
673 default "0x00200000" if NOT_COHERENT_CACHE
675 config BOOT_LOAD_BOOL
676 bool "Set the boot link/load address"
677 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
679 This option allows you to set the initial load address of the zImage
680 or zImage.initrd file. This can be useful if you are on a board
681 which has a small amount of memory.
683 Say N here unless you know what you are doing.
686 hex "Link/load address for booting" if BOOT_LOAD_BOOL
687 default "0x00400000" if 40x || 8xx || 8260
688 default "0x01000000" if 44x
692 bool "Pinned Kernel TLBs (860 ONLY)"
693 depends on ADVANCED_OPTIONS && 8xx
699 default "0xc000000000000000"
704 source "drivers/Kconfig"
708 # XXX source "arch/ppc/8xx_io/Kconfig"
710 # XXX source "arch/ppc/8260_io/Kconfig"
712 source "arch/powerpc/sysdev/qe_lib/Kconfig"
716 source "kernel/Kconfig.instrumentation"
718 source "arch/powerpc/Kconfig.debug"
720 source "security/Kconfig"
724 depends on COMPAT && KEYS
727 source "crypto/Kconfig"