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
102 select COMPAT_BINFMT_ELF
104 config SYSVIPC_COMPAT
106 depends on COMPAT && SYSVIPC
109 # All PPC32s use generic nvram driver through ppc_md
114 config SCHED_NO_NO_OMIT_FRAME_POINTER
118 config ARCH_MAY_HAVE_PC_FDC
120 default !PPC_PSERIES || PCI
128 config PPC_UDBG_16550
132 config GENERIC_TBSYNC
134 default y if PPC32 && SMP
146 config SYS_SUPPORTS_APM_EMULATION
147 default y if PMAC_APM_EMU
150 config DEFAULT_UIMAGE
153 Used to allow a board to specify it wants a uImage built by default
161 depends on (PPC_PMAC && !SMP) || BROKEN
166 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
169 config ARCH_HIBERNATION_POSSIBLE
171 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
174 config ARCH_SUSPEND_POSSIBLE
176 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
178 config PPC_DCR_NATIVE
188 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
191 config PPC_OF_PLATFORM_PCI
194 depends on PPC64 # not supported on 32 bits yet
197 source "init/Kconfig"
199 source "arch/powerpc/sysdev/Kconfig"
200 source "arch/powerpc/platforms/Kconfig"
202 menu "Kernel options"
205 bool "High memory support"
208 source kernel/time/Kconfig
209 source kernel/Kconfig.hz
210 source kernel/Kconfig.preempt
211 source "fs/Kconfig.binfmt"
213 # We optimistically allocate largepages from the VM, so make the limit
214 # large enough (16MB). This badly named config option is actually
216 config FORCE_MAX_ZONEORDER
219 default "9" if PPC_64K_PAGES
222 config HUGETLB_PAGE_SIZE_VARIABLE
224 depends on HUGETLB_PAGE
227 config MATH_EMULATION
228 bool "Math emulation"
229 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
231 Some PowerPC chips designed for embedded applications do not have
232 a floating-point unit and therefore do not implement the
233 floating-point instructions in the PowerPC instruction set. If you
234 say Y here, the kernel will include code to emulate a floating-point
235 unit, which will allow programs that use floating-point
238 config 8XX_MINIMAL_FPEMU
239 bool "Minimal math emulation for 8xx"
240 depends on 8xx && !MATH_EMULATION
242 Older arch/ppc kernels still emulated a few floating point
243 instructions such as load and store, even when full math
244 emulation is disabled. Say "Y" here if you want to preserve
247 It is recommended that you build a soft-float userspace instead.
250 bool "Enable IOMMU virtual merging"
254 Cause IO segments sent to a device for DMA to be merged virtually
255 by the IOMMU when they happen to have been allocated contiguously.
256 This doesn't add pressure to the IOMMU allocator. However, some
257 drivers don't support getting large merged segments coming back
260 Most drivers don't have this problem; it is safe to say Y here.
266 bool "Support for enabling/disabling CPUs"
267 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
269 Say Y here to be able to disable and re-enable individual
270 CPUs at runtime on SMP machines.
272 Say N if you are unsure.
274 config ARCH_ENABLE_MEMORY_HOTPLUG
277 config ARCH_HAS_WALK_MEMORY
280 config ARCH_ENABLE_MEMORY_HOTREMOVE
284 bool "kexec system call (EXPERIMENTAL)"
285 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
287 kexec is a system call that implements the ability to shutdown your
288 current kernel, and to start another kernel. It is like a reboot
289 but it is independent of the system firmware. And like a reboot
290 you can start any kernel with it, not just Linux.
292 The name comes from the similarity to the exec system call.
294 It is an ongoing process to be certain the hardware in a machine
295 is properly shutdown, so do not be surprised if this code does not
296 initially work for you. It may help to enable device hotplugging
297 support. As of this writing the exact hardware interface is
298 strongly in flux, so no good recommendation can be made.
301 bool "Build a kdump crash kernel (EXPERIMENTAL)"
302 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
304 Build a kernel suitable for use as a kdump capture kernel.
305 The kernel will be linked at a different address than normal, and
306 so can only be used for Kdump.
308 Don't change this unless you know what you are doing.
311 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
312 default y if PPC_PREP
315 bool "Distribute interrupts on all CPUs by default"
316 depends on SMP && !MV64360
318 This option gives the kernel permission to distribute IRQs across
319 multiple CPUs. Saying N here will route all IRQs to the first
320 CPU. Generally saying Y is safe, although some problems have been
321 reported with SMP Power Macintoshes with this option enabled.
326 default y if SMP && PPC_PSERIES
331 depends on NEED_MULTIPLE_NODES
333 config ARCH_SELECT_MEMORY_MODEL
337 config ARCH_FLATMEM_ENABLE
339 depends on (PPC64 && !NUMA) || PPC32
341 config ARCH_SPARSEMEM_ENABLE
344 select SPARSEMEM_VMEMMAP_ENABLE
346 config ARCH_SPARSEMEM_DEFAULT
348 depends on (SMP && PPC_PSERIES) || PPC_PS3
350 config ARCH_POPULATES_NODE_MAP
355 config ARCH_MEMORY_PROBE
357 depends on MEMORY_HOTPLUG
359 # Some NUMA nodes have memory ranges that span
360 # other nodes. Even though a pfn is valid and
361 # between a node's start and end pfns, it may not
362 # reside on that node. See memmap_init_zone()
364 config NODES_SPAN_OTHER_NODES
366 depends on NEED_MULTIPLE_NODES
368 config PPC_HAS_HASH_64K
376 select PPC_HAS_HASH_64K
378 This option changes the kernel logical page size to 64k. On machines
379 without processor support for 64k pages, the kernel will simulate
380 them by loading each individual 4k page on demand transparently,
381 while on hardware with such support, it will be used to map
382 normal application pages.
384 config PPC_SUBPAGE_PROT
385 bool "Support setting protections for 4k subpages"
386 depends on PPC_64K_PAGES
388 This option adds support for a system call to allow user programs
389 to set access permissions (read/write, readonly, or no access)
390 on the 4k subpages of each 64k page.
393 bool "SMT (Hyperthreading) scheduler support"
394 depends on PPC64 && SMP
396 SMT scheduler support improves the CPU scheduler's decision making
397 when dealing with POWER5 cpus at a cost of slightly increased
398 overhead in some places. If unsure say N here.
400 config PROC_DEVICETREE
401 bool "Support for device tree in /proc"
404 This option adds a device-tree directory under /proc which contains
405 an image of the device tree that the kernel copies from Open
406 Firmware or other boot firmware. If unsure, say Y here.
409 bool "Default bootloader kernel arguments"
412 string "Initial kernel command string"
413 depends on CMDLINE_BOOL
414 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
416 On some platforms, there is currently no way for the boot loader to
417 pass arguments to the kernel. For these platforms, you can supply
418 some command-line options at build time by entering them here. In
419 most cases you will need to specify the root device here.
422 config ARCH_WANTS_FREEZER_CONTROL
426 source kernel/power/Kconfig
430 bool "Enable seccomp to safely compute untrusted bytecode"
434 This kernel feature is useful for number crunching applications
435 that may need to compute untrusted bytecode during their
436 execution. By using pipes or other transports made available to
437 the process as file descriptors supporting the read/write
438 syscalls, it's possible to isolate those applications in
439 their own address space using seccomp. Once seccomp is
440 enabled via /proc/<pid>/seccomp, it cannot be disabled
441 and the task is only allowed to execute a few safe syscalls
442 defined by each seccomp mode.
444 If unsure, say Y. Only embedded should say N here.
450 default !PPC_ISERIES || PCI
455 bool "Support for ISA-bus hardware"
456 depends on PPC_PREP || PPC_CHRP
459 Find out whether you have ISA slots on your motherboard. ISA is the
460 name of a bus system, i.e. the way the CPU talks to the other stuff
461 inside your box. If you have an Apple machine, say N here; if you
462 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
463 you have an embedded board, consult your board documentation.
469 config GENERIC_ISA_DMA
471 depends on PPC64 || POWER4 || 6xx && !CPM2
474 config PPC_INDIRECT_PCI
477 default y if 40x || 44x
491 select PPC_INDIRECT_PCI
493 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
498 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
499 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
501 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
502 && !PPC_85xx && !PPC_86xx
503 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
504 default PCI_QSPAN if !4xx && !CPM2 && 8xx
505 select ARCH_SUPPORTS_MSI
507 Find out whether your system includes a PCI bus. PCI is the name of
508 a bus system, i.e. the way the CPU talks to the other stuff inside
509 your box. If you say Y here, the kernel will include drivers and
510 infrastructure code to support PCI bus devices.
520 depends on !4xx && !CPM2 && 8xx
523 Say Y here if you have a system based on a Motorola 8xx-series
524 embedded processor with a QSPAN PCI interface, otherwise say N.
528 depends on PCI && 8260
529 select PPC_INDIRECT_PCI
533 bool "Enable workaround for MPC826x erratum PCI 9"
534 depends on PCI_8260 && !8272
538 prompt "IDMA channel for PCI 9 workaround"
541 config 8260_PCI9_IDMA1
544 config 8260_PCI9_IDMA2
547 config 8260_PCI9_IDMA3
550 config 8260_PCI9_IDMA4
555 source "drivers/pci/pcie/Kconfig"
557 source "drivers/pci/Kconfig"
559 source "drivers/pcmcia/Kconfig"
561 source "drivers/pci/hotplug/Kconfig"
565 menu "Advanced setup"
568 config ADVANCED_OPTIONS
569 bool "Prompt for advanced kernel configuration options"
571 This option will enable prompting for a variety of advanced kernel
572 configuration options. These options can cause the kernel to not
573 work if they are set incorrectly, but can be used to optimize certain
574 aspects of kernel memory management.
576 Unless you know what you are doing, say N here.
578 comment "Default settings for advanced configuration options are used"
579 depends on !ADVANCED_OPTIONS
581 config HIGHMEM_START_BOOL
582 bool "Set high memory pool address"
583 depends on ADVANCED_OPTIONS && HIGHMEM
585 This option allows you to set the base address of the kernel virtual
586 area used to map high memory pages. This can be useful in
587 optimizing the layout of kernel virtual memory.
589 Say N here unless you know what you are doing.
592 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
595 config LOWMEM_SIZE_BOOL
596 bool "Set maximum low memory"
597 depends on ADVANCED_OPTIONS
599 This option allows you to set the maximum amount of memory which
600 will be used as "low memory", that is, memory which the kernel can
601 access directly, without having to set up a kernel virtual mapping.
602 This can be useful in optimizing the layout of kernel virtual
605 Say N here unless you know what you are doing.
608 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
611 config KERNEL_START_BOOL
612 bool "Set custom kernel base address"
613 depends on ADVANCED_OPTIONS
615 This option allows you to set the kernel virtual address at which
616 the kernel will map low memory (the kernel image will be linked at
617 this address). This can be useful in optimizing the virtual memory
618 layout of the system.
620 Say N here unless you know what you are doing.
623 hex "Virtual address of kernel base" if KERNEL_START_BOOL
626 config TASK_SIZE_BOOL
627 bool "Set custom user task size"
628 depends on ADVANCED_OPTIONS
630 This option allows you to set the amount of virtual address space
631 allocated to user tasks. This can be useful in optimizing the
632 virtual memory layout of the system.
634 Say N here unless you know what you are doing.
637 hex "Size of user task space" if TASK_SIZE_BOOL
638 default "0x80000000" if PPC_PREP || PPC_8xx
641 config CONSISTENT_START_BOOL
642 bool "Set custom consistent memory pool address"
643 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
645 This option allows you to set the base virtual address
646 of the consistent memory pool. This pool of virtual
647 memory is used to make consistent memory allocations.
649 config CONSISTENT_START
650 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
651 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
652 default "0xff100000" if NOT_COHERENT_CACHE
654 config CONSISTENT_SIZE_BOOL
655 bool "Set custom consistent memory pool size"
656 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
658 This option allows you to set the size of the
659 consistent memory pool. This pool of virtual memory
660 is used to make consistent memory allocations.
662 config CONSISTENT_SIZE
663 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
664 default "0x00200000" if NOT_COHERENT_CACHE
666 config BOOT_LOAD_BOOL
667 bool "Set the boot link/load address"
668 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
670 This option allows you to set the initial load address of the zImage
671 or zImage.initrd file. This can be useful if you are on a board
672 which has a small amount of memory.
674 Say N here unless you know what you are doing.
677 hex "Link/load address for booting" if BOOT_LOAD_BOOL
678 default "0x00400000" if 40x || 8xx || 8260
679 default "0x01000000" if 44x
683 bool "Pinned Kernel TLBs (860 ONLY)"
684 depends on ADVANCED_OPTIONS && 8xx
690 default "0xc000000000000000"
695 source "drivers/Kconfig"
699 # XXX source "arch/ppc/8xx_io/Kconfig"
701 # XXX source "arch/ppc/8260_io/Kconfig"
703 source "arch/powerpc/sysdev/qe_lib/Kconfig"
707 source "arch/powerpc/Kconfig.debug"
709 source "security/Kconfig"
713 depends on COMPAT && KEYS
716 source "crypto/Kconfig"