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 select COMPAT_BINFMT_ELF
102 config SYSVIPC_COMPAT
104 depends on COMPAT && SYSVIPC
107 # All PPC32s use generic nvram driver through ppc_md
112 config SCHED_NO_NO_OMIT_FRAME_POINTER
116 config ARCH_MAY_HAVE_PC_FDC
118 default !PPC_PSERIES || PCI
126 config PPC_UDBG_16550
130 config GENERIC_TBSYNC
132 default y if PPC32 && SMP
144 config SYS_SUPPORTS_APM_EMULATION
145 default y if PMAC_APM_EMU
148 config DEFAULT_UIMAGE
151 Used to allow a board to specify it wants a uImage built by default
159 depends on (PPC_PMAC && !SMP) || BROKEN
164 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
167 config ARCH_HIBERNATION_POSSIBLE
169 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
172 config ARCH_SUSPEND_POSSIBLE
174 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
176 config PPC_DCR_NATIVE
186 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
189 config PPC_OF_PLATFORM_PCI
192 depends on PPC64 # not supported on 32 bits yet
195 source "init/Kconfig"
197 source "arch/powerpc/sysdev/Kconfig"
198 source "arch/powerpc/platforms/Kconfig"
200 menu "Kernel options"
203 bool "High memory support"
206 source kernel/time/Kconfig
207 source kernel/Kconfig.hz
208 source kernel/Kconfig.preempt
209 source "fs/Kconfig.binfmt"
211 # We optimistically allocate largepages from the VM, so make the limit
212 # large enough (16MB). This badly named config option is actually
214 config FORCE_MAX_ZONEORDER
217 default "9" if PPC_64K_PAGES
220 config HUGETLB_PAGE_SIZE_VARIABLE
222 depends on HUGETLB_PAGE
225 config MATH_EMULATION
226 bool "Math emulation"
227 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
229 Some PowerPC chips designed for embedded applications do not have
230 a floating-point unit and therefore do not implement the
231 floating-point instructions in the PowerPC instruction set. If you
232 say Y here, the kernel will include code to emulate a floating-point
233 unit, which will allow programs that use floating-point
236 config 8XX_MINIMAL_FPEMU
237 bool "Minimal math emulation for 8xx"
238 depends on 8xx && !MATH_EMULATION
240 Older arch/ppc kernels still emulated a few floating point
241 instructions such as load and store, even when full math
242 emulation is disabled. Say "Y" here if you want to preserve
245 It is recommended that you build a soft-float userspace instead.
248 bool "Enable IOMMU virtual merging"
252 Cause IO segments sent to a device for DMA to be merged virtually
253 by the IOMMU when they happen to have been allocated contiguously.
254 This doesn't add pressure to the IOMMU allocator. However, some
255 drivers don't support getting large merged segments coming back
258 Most drivers don't have this problem; it is safe to say Y here.
264 bool "Support for enabling/disabling CPUs"
265 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
267 Say Y here to be able to disable and re-enable individual
268 CPUs at runtime on SMP machines.
270 Say N if you are unsure.
272 config ARCH_ENABLE_MEMORY_HOTPLUG
275 config ARCH_HAS_WALK_MEMORY
278 config ARCH_ENABLE_MEMORY_HOTREMOVE
282 bool "kexec system call (EXPERIMENTAL)"
283 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
285 kexec is a system call that implements the ability to shutdown your
286 current kernel, and to start another kernel. It is like a reboot
287 but it is independent of the system firmware. And like a reboot
288 you can start any kernel with it, not just Linux.
290 The name comes from the similarity to the exec system call.
292 It is an ongoing process to be certain the hardware in a machine
293 is properly shutdown, so do not be surprised if this code does not
294 initially work for you. It may help to enable device hotplugging
295 support. As of this writing the exact hardware interface is
296 strongly in flux, so no good recommendation can be made.
299 bool "Build a kdump crash kernel (EXPERIMENTAL)"
300 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
302 Build a kernel suitable for use as a kdump capture kernel.
303 The kernel will be linked at a different address than normal, and
304 so can only be used for Kdump.
306 Don't change this unless you know what you are doing.
309 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
310 default y if PPC_PREP
313 bool "Distribute interrupts on all CPUs by default"
314 depends on SMP && !MV64360
316 This option gives the kernel permission to distribute IRQs across
317 multiple CPUs. Saying N here will route all IRQs to the first
318 CPU. Generally saying Y is safe, although some problems have been
319 reported with SMP Power Macintoshes with this option enabled.
324 default y if SMP && PPC_PSERIES
329 depends on NEED_MULTIPLE_NODES
331 config ARCH_SELECT_MEMORY_MODEL
335 config ARCH_FLATMEM_ENABLE
337 depends on (PPC64 && !NUMA) || PPC32
339 config ARCH_SPARSEMEM_ENABLE
342 select SPARSEMEM_VMEMMAP_ENABLE
344 config ARCH_SPARSEMEM_DEFAULT
346 depends on (SMP && PPC_PSERIES) || PPC_PS3
348 config ARCH_POPULATES_NODE_MAP
353 config ARCH_MEMORY_PROBE
355 depends on MEMORY_HOTPLUG
357 # Some NUMA nodes have memory ranges that span
358 # other nodes. Even though a pfn is valid and
359 # between a node's start and end pfns, it may not
360 # reside on that node. See memmap_init_zone()
362 config NODES_SPAN_OTHER_NODES
364 depends on NEED_MULTIPLE_NODES
366 config PPC_HAS_HASH_64K
374 select PPC_HAS_HASH_64K
376 This option changes the kernel logical page size to 64k. On machines
377 without processor support for 64k pages, the kernel will simulate
378 them by loading each individual 4k page on demand transparently,
379 while on hardware with such support, it will be used to map
380 normal application pages.
382 config PPC_SUBPAGE_PROT
383 bool "Support setting protections for 4k subpages"
384 depends on PPC_64K_PAGES
386 This option adds support for a system call to allow user programs
387 to set access permissions (read/write, readonly, or no access)
388 on the 4k subpages of each 64k page.
391 bool "SMT (Hyperthreading) scheduler support"
392 depends on PPC64 && SMP
394 SMT scheduler support improves the CPU scheduler's decision making
395 when dealing with POWER5 cpus at a cost of slightly increased
396 overhead in some places. If unsure say N here.
398 config PROC_DEVICETREE
399 bool "Support for device tree in /proc"
402 This option adds a device-tree directory under /proc which contains
403 an image of the device tree that the kernel copies from Open
404 Firmware or other boot firmware. If unsure, say Y here.
407 bool "Default bootloader kernel arguments"
410 string "Initial kernel command string"
411 depends on CMDLINE_BOOL
412 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
414 On some platforms, there is currently no way for the boot loader to
415 pass arguments to the kernel. For these platforms, you can supply
416 some command-line options at build time by entering them here. In
417 most cases you will need to specify the root device here.
420 config ARCH_WANTS_FREEZER_CONTROL
424 source kernel/power/Kconfig
428 bool "Enable seccomp to safely compute untrusted bytecode"
432 This kernel feature is useful for number crunching applications
433 that may need to compute untrusted bytecode during their
434 execution. By using pipes or other transports made available to
435 the process as file descriptors supporting the read/write
436 syscalls, it's possible to isolate those applications in
437 their own address space using seccomp. Once seccomp is
438 enabled via /proc/<pid>/seccomp, it cannot be disabled
439 and the task is only allowed to execute a few safe syscalls
440 defined by each seccomp mode.
442 If unsure, say Y. Only embedded should say N here.
444 config WANT_DEVICE_TREE
452 default !PPC_ISERIES || PCI
457 bool "Support for ISA-bus hardware"
458 depends on PPC_PREP || PPC_CHRP
461 Find out whether you have ISA slots on your motherboard. ISA is the
462 name of a bus system, i.e. the way the CPU talks to the other stuff
463 inside your box. If you have an Apple machine, say N here; if you
464 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
465 you have an embedded board, consult your board documentation.
471 config GENERIC_ISA_DMA
473 depends on PPC64 || POWER4 || 6xx && !CPM2
476 config PPC_INDIRECT_PCI
479 default y if 40x || 44x
493 select PPC_INDIRECT_PCI
495 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
500 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
501 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
503 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
504 && !PPC_85xx && !PPC_86xx
505 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
506 default PCI_QSPAN if !4xx && !CPM2 && 8xx
507 select ARCH_SUPPORTS_MSI
509 Find out whether your system includes a PCI bus. PCI is the name of
510 a bus system, i.e. the way the CPU talks to the other stuff inside
511 your box. If you say Y here, the kernel will include drivers and
512 infrastructure code to support PCI bus devices.
522 depends on !4xx && !CPM2 && 8xx
525 Say Y here if you have a system based on a Motorola 8xx-series
526 embedded processor with a QSPAN PCI interface, otherwise say N.
530 depends on PCI && 8260
531 select PPC_INDIRECT_PCI
535 bool "Enable workaround for MPC826x erratum PCI 9"
536 depends on PCI_8260 && !8272
540 prompt "IDMA channel for PCI 9 workaround"
543 config 8260_PCI9_IDMA1
546 config 8260_PCI9_IDMA2
549 config 8260_PCI9_IDMA3
552 config 8260_PCI9_IDMA4
557 source "drivers/pci/pcie/Kconfig"
559 source "drivers/pci/Kconfig"
561 source "drivers/pcmcia/Kconfig"
563 source "drivers/pci/hotplug/Kconfig"
567 menu "Advanced setup"
570 config ADVANCED_OPTIONS
571 bool "Prompt for advanced kernel configuration options"
573 This option will enable prompting for a variety of advanced kernel
574 configuration options. These options can cause the kernel to not
575 work if they are set incorrectly, but can be used to optimize certain
576 aspects of kernel memory management.
578 Unless you know what you are doing, say N here.
580 comment "Default settings for advanced configuration options are used"
581 depends on !ADVANCED_OPTIONS
583 config HIGHMEM_START_BOOL
584 bool "Set high memory pool address"
585 depends on ADVANCED_OPTIONS && HIGHMEM
587 This option allows you to set the base address of the kernel virtual
588 area used to map high memory pages. This can be useful in
589 optimizing the layout of kernel virtual memory.
591 Say N here unless you know what you are doing.
594 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
597 config LOWMEM_SIZE_BOOL
598 bool "Set maximum low memory"
599 depends on ADVANCED_OPTIONS
601 This option allows you to set the maximum amount of memory which
602 will be used as "low memory", that is, memory which the kernel can
603 access directly, without having to set up a kernel virtual mapping.
604 This can be useful in optimizing the layout of kernel virtual
607 Say N here unless you know what you are doing.
610 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
613 config KERNEL_START_BOOL
614 bool "Set custom kernel base address"
615 depends on ADVANCED_OPTIONS
617 This option allows you to set the kernel virtual address at which
618 the kernel will map low memory (the kernel image will be linked at
619 this address). This can be useful in optimizing the virtual memory
620 layout of the system.
622 Say N here unless you know what you are doing.
625 hex "Virtual address of kernel base" if KERNEL_START_BOOL
628 config TASK_SIZE_BOOL
629 bool "Set custom user task size"
630 depends on ADVANCED_OPTIONS
632 This option allows you to set the amount of virtual address space
633 allocated to user tasks. This can be useful in optimizing the
634 virtual memory layout of the system.
636 Say N here unless you know what you are doing.
639 hex "Size of user task space" if TASK_SIZE_BOOL
640 default "0x80000000" if PPC_PREP || PPC_8xx
643 config CONSISTENT_START_BOOL
644 bool "Set custom consistent memory pool address"
645 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
647 This option allows you to set the base virtual address
648 of the consistent memory pool. This pool of virtual
649 memory is used to make consistent memory allocations.
651 config CONSISTENT_START
652 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
653 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
654 default "0xff100000" if NOT_COHERENT_CACHE
656 config CONSISTENT_SIZE_BOOL
657 bool "Set custom consistent memory pool size"
658 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
660 This option allows you to set the size of the
661 consistent memory pool. This pool of virtual memory
662 is used to make consistent memory allocations.
664 config CONSISTENT_SIZE
665 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
666 default "0x00200000" if NOT_COHERENT_CACHE
668 config BOOT_LOAD_BOOL
669 bool "Set the boot link/load address"
670 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
672 This option allows you to set the initial load address of the zImage
673 or zImage.initrd file. This can be useful if you are on a board
674 which has a small amount of memory.
676 Say N here unless you know what you are doing.
679 hex "Link/load address for booting" if BOOT_LOAD_BOOL
680 default "0x00400000" if 40x || 8xx || 8260
681 default "0x01000000" if 44x
685 bool "Pinned Kernel TLBs (860 ONLY)"
686 depends on ADVANCED_OPTIONS && 8xx
692 default "0xc000000000000000"
697 source "drivers/Kconfig"
701 # XXX source "arch/ppc/8xx_io/Kconfig"
703 # XXX source "arch/ppc/8260_io/Kconfig"
705 source "arch/powerpc/sysdev/qe_lib/Kconfig"
709 source "arch/powerpc/Kconfig.debug"
711 source "security/Kconfig"
715 depends on COMPAT && KEYS
718 source "crypto/Kconfig"