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 "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
313 default y if PPC_PREP
316 bool "Distribute interrupts on all CPUs by default"
317 depends on SMP && !MV64360
319 This option gives the kernel permission to distribute IRQs across
320 multiple CPUs. Saying N here will route all IRQs to the first
321 CPU. Generally saying Y is safe, although some problems have been
322 reported with SMP Power Macintoshes with this option enabled.
327 default y if SMP && PPC_PSERIES
332 depends on NEED_MULTIPLE_NODES
334 config ARCH_SELECT_MEMORY_MODEL
338 config ARCH_FLATMEM_ENABLE
340 depends on (PPC64 && !NUMA) || PPC32
342 config ARCH_SPARSEMEM_ENABLE
345 select SPARSEMEM_VMEMMAP_ENABLE
347 config ARCH_SPARSEMEM_DEFAULT
349 depends on (SMP && PPC_PSERIES) || PPC_PS3
351 config ARCH_POPULATES_NODE_MAP
356 config ARCH_MEMORY_PROBE
358 depends on MEMORY_HOTPLUG
360 # Some NUMA nodes have memory ranges that span
361 # other nodes. Even though a pfn is valid and
362 # between a node's start and end pfns, it may not
363 # reside on that node. See memmap_init_zone()
365 config NODES_SPAN_OTHER_NODES
367 depends on NEED_MULTIPLE_NODES
369 config PPC_HAS_HASH_64K
377 select PPC_HAS_HASH_64K
379 This option changes the kernel logical page size to 64k. On machines
380 without processor support for 64k pages, the kernel will simulate
381 them by loading each individual 4k page on demand transparently,
382 while on hardware with such support, it will be used to map
383 normal application pages.
385 config PPC_SUBPAGE_PROT
386 bool "Support setting protections for 4k subpages"
387 depends on PPC_64K_PAGES
389 This option adds support for a system call to allow user programs
390 to set access permissions (read/write, readonly, or no access)
391 on the 4k subpages of each 64k page.
394 bool "SMT (Hyperthreading) scheduler support"
395 depends on PPC64 && SMP
397 SMT scheduler support improves the CPU scheduler's decision making
398 when dealing with POWER5 cpus at a cost of slightly increased
399 overhead in some places. If unsure say N here.
401 config PROC_DEVICETREE
402 bool "Support for device tree in /proc"
405 This option adds a device-tree directory under /proc which contains
406 an image of the device tree that the kernel copies from Open
407 Firmware or other boot firmware. If unsure, say Y here.
410 bool "Default bootloader kernel arguments"
413 string "Initial kernel command string"
414 depends on CMDLINE_BOOL
415 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
417 On some platforms, there is currently no way for the boot loader to
418 pass arguments to the kernel. For these platforms, you can supply
419 some command-line options at build time by entering them here. In
420 most cases you will need to specify the root device here.
423 config ARCH_WANTS_FREEZER_CONTROL
427 source kernel/power/Kconfig
431 bool "Enable seccomp to safely compute untrusted bytecode"
435 This kernel feature is useful for number crunching applications
436 that may need to compute untrusted bytecode during their
437 execution. By using pipes or other transports made available to
438 the process as file descriptors supporting the read/write
439 syscalls, it's possible to isolate those applications in
440 their own address space using seccomp. Once seccomp is
441 enabled via /proc/<pid>/seccomp, it cannot be disabled
442 and the task is only allowed to execute a few safe syscalls
443 defined by each seccomp mode.
445 If unsure, say Y. Only embedded should say N here.
451 default !PPC_ISERIES || PCI
456 bool "Support for ISA-bus hardware"
457 depends on PPC_PREP || PPC_CHRP
460 Find out whether you have ISA slots on your motherboard. ISA is the
461 name of a bus system, i.e. the way the CPU talks to the other stuff
462 inside your box. If you have an Apple machine, say N here; if you
463 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
464 you have an embedded board, consult your board documentation.
470 config GENERIC_ISA_DMA
472 depends on PPC64 || POWER4 || 6xx && !CPM2
475 config PPC_INDIRECT_PCI
478 default y if 40x || 44x
492 select PPC_INDIRECT_PCI
494 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
499 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
500 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
502 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
503 && !PPC_85xx && !PPC_86xx
504 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
505 default PCI_QSPAN if !4xx && !CPM2 && 8xx
506 select ARCH_SUPPORTS_MSI
508 Find out whether your system includes a PCI bus. PCI is the name of
509 a bus system, i.e. the way the CPU talks to the other stuff inside
510 your box. If you say Y here, the kernel will include drivers and
511 infrastructure code to support PCI bus devices.
521 depends on !4xx && !CPM2 && 8xx
524 Say Y here if you have a system based on a Motorola 8xx-series
525 embedded processor with a QSPAN PCI interface, otherwise say N.
529 depends on PCI && 8260
530 select PPC_INDIRECT_PCI
534 bool "Enable workaround for MPC826x erratum PCI 9"
535 depends on PCI_8260 && !8272
539 prompt "IDMA channel for PCI 9 workaround"
542 config 8260_PCI9_IDMA1
545 config 8260_PCI9_IDMA2
548 config 8260_PCI9_IDMA3
551 config 8260_PCI9_IDMA4
556 source "drivers/pci/pcie/Kconfig"
558 source "drivers/pci/Kconfig"
560 source "drivers/pcmcia/Kconfig"
562 source "drivers/pci/hotplug/Kconfig"
566 menu "Advanced setup"
569 config ADVANCED_OPTIONS
570 bool "Prompt for advanced kernel configuration options"
572 This option will enable prompting for a variety of advanced kernel
573 configuration options. These options can cause the kernel to not
574 work if they are set incorrectly, but can be used to optimize certain
575 aspects of kernel memory management.
577 Unless you know what you are doing, say N here.
579 comment "Default settings for advanced configuration options are used"
580 depends on !ADVANCED_OPTIONS
582 config HIGHMEM_START_BOOL
583 bool "Set high memory pool address"
584 depends on ADVANCED_OPTIONS && HIGHMEM
586 This option allows you to set the base address of the kernel virtual
587 area used to map high memory pages. This can be useful in
588 optimizing the layout of kernel virtual memory.
590 Say N here unless you know what you are doing.
593 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
596 config LOWMEM_SIZE_BOOL
597 bool "Set maximum low memory"
598 depends on ADVANCED_OPTIONS
600 This option allows you to set the maximum amount of memory which
601 will be used as "low memory", that is, memory which the kernel can
602 access directly, without having to set up a kernel virtual mapping.
603 This can be useful in optimizing the layout of kernel virtual
606 Say N here unless you know what you are doing.
609 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
612 config KERNEL_START_BOOL
613 bool "Set custom kernel base address"
614 depends on ADVANCED_OPTIONS
616 This option allows you to set the kernel virtual address at which
617 the kernel will map low memory (the kernel image will be linked at
618 this address). This can be useful in optimizing the virtual memory
619 layout of the system.
621 Say N here unless you know what you are doing.
624 hex "Virtual address of kernel base" if KERNEL_START_BOOL
627 config TASK_SIZE_BOOL
628 bool "Set custom user task size"
629 depends on ADVANCED_OPTIONS
631 This option allows you to set the amount of virtual address space
632 allocated to user tasks. This can be useful in optimizing the
633 virtual memory layout of the system.
635 Say N here unless you know what you are doing.
638 hex "Size of user task space" if TASK_SIZE_BOOL
639 default "0x80000000" if PPC_PREP || PPC_8xx
642 config CONSISTENT_START_BOOL
643 bool "Set custom consistent memory pool address"
644 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
646 This option allows you to set the base virtual address
647 of the consistent memory pool. This pool of virtual
648 memory is used to make consistent memory allocations.
650 config CONSISTENT_START
651 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
652 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
653 default "0xff100000" if NOT_COHERENT_CACHE
655 config CONSISTENT_SIZE_BOOL
656 bool "Set custom consistent memory pool size"
657 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
659 This option allows you to set the size of the
660 consistent memory pool. This pool of virtual memory
661 is used to make consistent memory allocations.
663 config CONSISTENT_SIZE
664 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
665 default "0x00200000" if NOT_COHERENT_CACHE
667 config BOOT_LOAD_BOOL
668 bool "Set the boot link/load address"
669 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
671 This option allows you to set the initial load address of the zImage
672 or zImage.initrd file. This can be useful if you are on a board
673 which has a small amount of memory.
675 Say N here unless you know what you are doing.
678 hex "Link/load address for booting" if BOOT_LOAD_BOOL
679 default "0x00400000" if 40x || 8xx || 8260
680 default "0x01000000" if 44x
684 bool "Pinned Kernel TLBs (860 ONLY)"
685 depends on ADVANCED_OPTIONS && 8xx
691 default "0xc000000000000000"
696 source "drivers/Kconfig"
700 # XXX source "arch/ppc/8xx_io/Kconfig"
702 # XXX source "arch/ppc/8260_io/Kconfig"
704 source "arch/powerpc/sysdev/qe_lib/Kconfig"
708 source "arch/powerpc/Kconfig.debug"
710 source "security/Kconfig"
714 depends on COMPAT && KEYS
717 source "crypto/Kconfig"