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 STACKTRACE_SUPPORT
56 config TRACE_IRQFLAGS_SUPPORT
61 config LOCKDEP_SUPPORT
65 config RWSEM_GENERIC_SPINLOCK
68 config RWSEM_XCHGADD_ALGORITHM
72 config GENERIC_LOCKBREAK
75 depends on SMP && PREEMPT
77 config ARCH_HAS_ILOG2_U32
81 config ARCH_HAS_ILOG2_U64
85 config GENERIC_HWEIGHT
89 config GENERIC_CALIBRATE_DELAY
93 config GENERIC_FIND_NEXT_BIT
100 Generic GPIO API support
102 config ARCH_NO_VIRT_TO_BUS
108 select HAVE_DYNAMIC_FTRACE
112 select HAVE_KRETPROBES
123 select COMPAT_BINFMT_ELF
125 config SYSVIPC_COMPAT
127 depends on COMPAT && SYSVIPC
130 # All PPC32s use generic nvram driver through ppc_md
135 config SCHED_NO_NO_OMIT_FRAME_POINTER
139 config ARCH_MAY_HAVE_PC_FDC
141 default !PPC_PSERIES || PCI
149 config PPC_UDBG_16550
153 config GENERIC_TBSYNC
155 default y if PPC32 && SMP
167 config SYS_SUPPORTS_APM_EMULATION
168 default y if PMAC_APM_EMU
171 config DEFAULT_UIMAGE
174 Used to allow a board to specify it wants a uImage built by default
182 depends on (PPC_PMAC && !SMP) || BROKEN
187 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
190 config ARCH_HIBERNATION_POSSIBLE
192 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
195 config ARCH_SUSPEND_POSSIBLE
197 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
199 config PPC_DCR_NATIVE
209 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
212 config PPC_OF_PLATFORM_PCI
215 depends on PPC64 # not supported on 32 bits yet
218 source "init/Kconfig"
220 source "arch/powerpc/sysdev/Kconfig"
221 source "arch/powerpc/platforms/Kconfig"
223 menu "Kernel options"
226 bool "High memory support"
229 source kernel/time/Kconfig
230 source kernel/Kconfig.hz
231 source kernel/Kconfig.preempt
232 source "fs/Kconfig.binfmt"
234 config HUGETLB_PAGE_SIZE_VARIABLE
236 depends on HUGETLB_PAGE
239 config MATH_EMULATION
240 bool "Math emulation"
241 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
243 Some PowerPC chips designed for embedded applications do not have
244 a floating-point unit and therefore do not implement the
245 floating-point instructions in the PowerPC instruction set. If you
246 say Y here, the kernel will include code to emulate a floating-point
247 unit, which will allow programs that use floating-point
250 config 8XX_MINIMAL_FPEMU
251 bool "Minimal math emulation for 8xx"
252 depends on 8xx && !MATH_EMULATION
254 Older arch/ppc kernels still emulated a few floating point
255 instructions such as load and store, even when full math
256 emulation is disabled. Say "Y" here if you want to preserve
259 It is recommended that you build a soft-float userspace instead.
262 bool "Enable IOMMU virtual merging"
266 Cause IO segments sent to a device for DMA to be merged virtually
267 by the IOMMU when they happen to have been allocated contiguously.
268 This doesn't add pressure to the IOMMU allocator. However, some
269 drivers don't support getting large merged segments coming back
272 Most drivers don't have this problem; it is safe to say Y here.
278 bool "Support for enabling/disabling CPUs"
279 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
281 Say Y here to be able to disable and re-enable individual
282 CPUs at runtime on SMP machines.
284 Say N if you are unsure.
286 config ARCH_ENABLE_MEMORY_HOTPLUG
289 config ARCH_HAS_WALK_MEMORY
292 config ARCH_ENABLE_MEMORY_HOTREMOVE
296 bool "kexec system call (EXPERIMENTAL)"
297 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
299 kexec is a system call that implements the ability to shutdown your
300 current kernel, and to start another kernel. It is like a reboot
301 but it is independent of the system firmware. And like a reboot
302 you can start any kernel with it, not just Linux.
304 The name comes from the similarity to the exec system call.
306 It is an ongoing process to be certain the hardware in a machine
307 is properly shutdown, so do not be surprised if this code does not
308 initially work for you. It may help to enable device hotplugging
309 support. As of this writing the exact hardware interface is
310 strongly in flux, so no good recommendation can be made.
313 bool "Build a kdump crash kernel (EXPERIMENTAL)"
314 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
316 Build a kernel suitable for use as a kdump capture kernel.
317 The kernel will be linked at a different address than normal, and
318 so can only be used for Kdump.
320 Don't change this unless you know what you are doing.
323 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
324 depends on PPC_PSERIES && EXPERIMENTAL
326 Hypervisor-assisted dump is meant to be a kdump replacement
327 offering robustness and speed not possible without system
328 hypervisor assistence.
333 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
334 default y if PPC_PREP
337 bool "Distribute interrupts on all CPUs by default"
338 depends on SMP && !MV64360
340 This option gives the kernel permission to distribute IRQs across
341 multiple CPUs. Saying N here will route all IRQs to the first
342 CPU. Generally saying Y is safe, although some problems have been
343 reported with SMP Power Macintoshes with this option enabled.
348 default y if SMP && PPC_PSERIES
353 depends on NEED_MULTIPLE_NODES
355 config ARCH_SELECT_MEMORY_MODEL
359 config ARCH_FLATMEM_ENABLE
361 depends on (PPC64 && !NUMA) || PPC32
363 config ARCH_SPARSEMEM_ENABLE
366 select SPARSEMEM_VMEMMAP_ENABLE
368 config ARCH_SPARSEMEM_DEFAULT
370 depends on (SMP && PPC_PSERIES) || PPC_PS3
372 config ARCH_POPULATES_NODE_MAP
377 config ARCH_MEMORY_PROBE
379 depends on MEMORY_HOTPLUG
381 # Some NUMA nodes have memory ranges that span
382 # other nodes. Even though a pfn is valid and
383 # between a node's start and end pfns, it may not
384 # reside on that node. See memmap_init_zone()
386 config NODES_SPAN_OTHER_NODES
388 depends on NEED_MULTIPLE_NODES
390 config PPC_HAS_HASH_64K
398 select PPC_HAS_HASH_64K
400 This option changes the kernel logical page size to 64k. On machines
401 without processor support for 64k pages, the kernel will simulate
402 them by loading each individual 4k page on demand transparently,
403 while on hardware with such support, it will be used to map
404 normal application pages.
406 config FORCE_MAX_ZONEORDER
407 int "Maximum zone order"
408 default "9" if PPC_64K_PAGES
409 default "13" if PPC64 && !PPC_64K_PAGES
412 The kernel memory allocator divides physically contiguous memory
413 blocks into "zones", where each zone is a power of two number of
414 pages. This option selects the largest power of two that the kernel
415 keeps in the memory allocator. If you need to allocate very large
416 blocks of physically contiguous memory, then you may need to
419 This config option is actually maximum order plus one. For example,
420 a value of 11 means that the largest free memory block is 2^10 pages.
422 The page size is not necessarily 4KB. For example, on 64-bit
423 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
424 this in mind when choosing a value for this option.
426 config PPC_SUBPAGE_PROT
427 bool "Support setting protections for 4k subpages"
428 depends on PPC_64K_PAGES
430 This option adds support for a system call to allow user programs
431 to set access permissions (read/write, readonly, or no access)
432 on the 4k subpages of each 64k page.
435 bool "SMT (Hyperthreading) scheduler support"
436 depends on PPC64 && SMP
438 SMT scheduler support improves the CPU scheduler's decision making
439 when dealing with POWER5 cpus at a cost of slightly increased
440 overhead in some places. If unsure say N here.
442 config PROC_DEVICETREE
443 bool "Support for device tree in /proc"
446 This option adds a device-tree directory under /proc which contains
447 an image of the device tree that the kernel copies from Open
448 Firmware or other boot firmware. If unsure, say Y here.
451 bool "Default bootloader kernel arguments"
454 string "Initial kernel command string"
455 depends on CMDLINE_BOOL
456 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
458 On some platforms, there is currently no way for the boot loader to
459 pass arguments to the kernel. For these platforms, you can supply
460 some command-line options at build time by entering them here. In
461 most cases you will need to specify the root device here.
464 config ARCH_WANTS_FREEZER_CONTROL
468 source kernel/power/Kconfig
472 bool "Enable seccomp to safely compute untrusted bytecode"
476 This kernel feature is useful for number crunching applications
477 that may need to compute untrusted bytecode during their
478 execution. By using pipes or other transports made available to
479 the process as file descriptors supporting the read/write
480 syscalls, it's possible to isolate those applications in
481 their own address space using seccomp. Once seccomp is
482 enabled via /proc/<pid>/seccomp, it cannot be disabled
483 and the task is only allowed to execute a few safe syscalls
484 defined by each seccomp mode.
486 If unsure, say Y. Only embedded should say N here.
492 default !PPC_ISERIES || PCI
497 bool "Support for ISA-bus hardware"
498 depends on PPC_PREP || PPC_CHRP
501 Find out whether you have ISA slots on your motherboard. ISA is the
502 name of a bus system, i.e. the way the CPU talks to the other stuff
503 inside your box. If you have an Apple machine, say N here; if you
504 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
505 you have an embedded board, consult your board documentation.
511 config GENERIC_ISA_DMA
513 depends on PPC64 || POWER4 || 6xx && !CPM2
516 config PPC_INDIRECT_PCI
519 default y if 40x || 44x
533 select PPC_INDIRECT_PCI
541 Freescale Localbus support
543 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
548 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
549 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
551 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
552 && !PPC_85xx && !PPC_86xx
553 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
554 default PCI_QSPAN if !4xx && !CPM2 && 8xx
555 select ARCH_SUPPORTS_MSI
557 Find out whether your system includes a PCI bus. PCI is the name of
558 a bus system, i.e. the way the CPU talks to the other stuff inside
559 your box. If you say Y here, the kernel will include drivers and
560 infrastructure code to support PCI bus devices.
570 depends on !4xx && !CPM2 && 8xx
573 Say Y here if you have a system based on a Motorola 8xx-series
574 embedded processor with a QSPAN PCI interface, otherwise say N.
578 depends on PCI && 8260
579 select PPC_INDIRECT_PCI
583 bool "Enable workaround for MPC826x erratum PCI 9"
584 depends on PCI_8260 && !8272
588 prompt "IDMA channel for PCI 9 workaround"
591 config 8260_PCI9_IDMA1
594 config 8260_PCI9_IDMA2
597 config 8260_PCI9_IDMA3
600 config 8260_PCI9_IDMA4
605 source "drivers/pci/pcie/Kconfig"
607 source "drivers/pci/Kconfig"
609 source "drivers/pcmcia/Kconfig"
611 source "drivers/pci/hotplug/Kconfig"
618 bool "RapidIO support"
619 depends on HAS_RAPIDIO
621 If you say Y here, the kernel will include drivers and
622 infrastructure code to support RapidIO interconnect devices.
624 source "drivers/rapidio/Kconfig"
628 menu "Advanced setup"
631 config ADVANCED_OPTIONS
632 bool "Prompt for advanced kernel configuration options"
634 This option will enable prompting for a variety of advanced kernel
635 configuration options. These options can cause the kernel to not
636 work if they are set incorrectly, but can be used to optimize certain
637 aspects of kernel memory management.
639 Unless you know what you are doing, say N here.
641 comment "Default settings for advanced configuration options are used"
642 depends on !ADVANCED_OPTIONS
644 config LOWMEM_SIZE_BOOL
645 bool "Set maximum low memory"
646 depends on ADVANCED_OPTIONS
648 This option allows you to set the maximum amount of memory which
649 will be used as "low memory", that is, memory which the kernel can
650 access directly, without having to set up a kernel virtual mapping.
651 This can be useful in optimizing the layout of kernel virtual
654 Say N here unless you know what you are doing.
657 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
661 bool "Build a relocatable kernel (EXPERIMENTAL)"
662 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
664 This builds a kernel image that is capable of running at the
665 location the kernel is loaded at (some alignment restrictions may
668 One use is for the kexec on panic case where the recovery kernel
669 must live at a different physical address than the primary
672 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
673 it has been loaded at and the compile time physical addresses
674 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
675 setting can still be useful to bootwrappers that need to know the
676 load location of the kernel (eg. u-boot/mkimage).
678 config PAGE_OFFSET_BOOL
679 bool "Set custom page offset address"
680 depends on ADVANCED_OPTIONS
682 This option allows you to set the kernel virtual address at which
683 the kernel will map low memory. This can be useful in optimizing
684 the virtual memory layout of the system.
686 Say N here unless you know what you are doing.
689 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
692 config KERNEL_START_BOOL
693 bool "Set custom kernel base address"
694 depends on ADVANCED_OPTIONS
696 This option allows you to set the kernel virtual address at which
697 the kernel will be loaded. Normally this should match PAGE_OFFSET
698 however there are times (like kdump) that one might not want them
701 Say N here unless you know what you are doing.
704 hex "Virtual address of kernel base" if KERNEL_START_BOOL
705 default PAGE_OFFSET if PAGE_OFFSET_BOOL
706 default "0xc2000000" if CRASH_DUMP
709 config PHYSICAL_START_BOOL
710 bool "Set physical address where the kernel is loaded"
711 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
713 This gives the physical address where the kernel is loaded.
715 Say N here unless you know what you are doing.
717 config PHYSICAL_START
718 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
719 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
722 config PHYSICAL_ALIGN
724 default "0x10000000" if FSL_BOOKE
726 This value puts the alignment restrictions on physical address
727 where kernel is loaded and run from. Kernel is compiled for an
728 address which meets above alignment restriction.
730 config TASK_SIZE_BOOL
731 bool "Set custom user task size"
732 depends on ADVANCED_OPTIONS
734 This option allows you to set the amount of virtual address space
735 allocated to user tasks. This can be useful in optimizing the
736 virtual memory layout of the system.
738 Say N here unless you know what you are doing.
741 hex "Size of user task space" if TASK_SIZE_BOOL
742 default "0x80000000" if PPC_PREP || PPC_8xx
745 config CONSISTENT_START_BOOL
746 bool "Set custom consistent memory pool address"
747 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
749 This option allows you to set the base virtual address
750 of the consistent memory pool. This pool of virtual
751 memory is used to make consistent memory allocations.
753 config CONSISTENT_START
754 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
755 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
756 default "0xff100000" if NOT_COHERENT_CACHE
758 config CONSISTENT_SIZE_BOOL
759 bool "Set custom consistent memory pool size"
760 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
762 This option allows you to set the size of the
763 consistent memory pool. This pool of virtual memory
764 is used to make consistent memory allocations.
766 config CONSISTENT_SIZE
767 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
768 default "0x00200000" if NOT_COHERENT_CACHE
771 bool "Pinned Kernel TLBs (860 ONLY)"
772 depends on ADVANCED_OPTIONS && 8xx
778 default "0xc000000000000000"
781 default "0xc000000002000000" if CRASH_DUMP
782 default "0xc000000000000000"
783 config PHYSICAL_START
785 default "0x02000000" if CRASH_DUMP
791 source "drivers/Kconfig"
795 # XXX source "arch/ppc/8xx_io/Kconfig"
797 # XXX source "arch/ppc/8260_io/Kconfig"
799 source "arch/powerpc/sysdev/qe_lib/Kconfig"
803 source "arch/powerpc/Kconfig.debug"
805 source "security/Kconfig"
809 depends on COMPAT && KEYS
812 source "crypto/Kconfig"
821 source "arch/powerpc/kvm/Kconfig"