1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
5 mainmenu "Linux/PowerPC Kernel Configuration"
11 This option selects whether a 32-bit or a 64-bit kernel
14 config PPC_PM_NEEDS_RTC_LIB
34 config GENERIC_HARDIRQS
42 config RWSEM_GENERIC_SPINLOCK
45 config RWSEM_XCHGADD_ALGORITHM
49 config ARCH_HAS_ILOG2_U32
53 config ARCH_HAS_ILOG2_U64
57 config GENERIC_HWEIGHT
61 config GENERIC_CALIBRATE_DELAY
65 config GENERIC_FIND_NEXT_BIT
83 depends on COMPAT && SYSVIPC
86 # All PPC32s use generic nvram driver through ppc_md
91 config SCHED_NO_NO_OMIT_FRAME_POINTER
95 config ARCH_MAY_HAVE_PC_FDC
97 default !PPC_PSERIES || PCI
102 config PPC_UDBG_16550
106 config GENERIC_TBSYNC
108 default y if PPC32 && SMP
120 config SYS_SUPPORTS_APM_EMULATION
121 default y if PMAC_APM_EMU
124 config DEFAULT_UIMAGE
127 Used to allow a board to specify it wants a uImage built by default
132 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
135 menu "Processor support"
137 prompt "Processor Type"
142 bool "52xx/6xx/7xx/74xx"
146 There are four families of PowerPC chips supported. The more common
147 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
148 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
149 embedded versions (403 and 405) and the high end 64 bit Power
150 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
152 This option is the catch-all for 6xx types, including some of the
153 embedded versions. Unless there is see an option for the specific
154 chip family you are using, you want this option.
156 You do not want this if you are building a kernel for a 64 bit
157 IBM RS/6000 or an Apple G5, choose 6xx.
159 If unsure, select this option
161 Note that the kernel runs in 32-bit mode even on 64-bit chips.
164 bool "Freescale 82xx"
169 bool "Freescale 83xx"
174 select WANT_DEVICE_TREE
177 bool "Freescale 85xx"
181 select WANT_DEVICE_TREE
184 bool "Freescale 86xx"
191 The Freescale E600 SoCs have 74xx cores.
200 select PPC_DCR_NATIVE
204 select PPC_DCR_NATIVE
205 select WANT_DEVICE_TREE
208 bool "Freescale e200"
213 bool "Optimize for POWER4"
217 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
218 The resulting binary will not work on POWER3 or RS64 processors
219 when compiled with binutils 2.15 or later.
224 default y if !POWER4_ONLY
233 # this is temp to handle compat with arch=ppc
237 # this is temp to handle compat with arch=ppc
241 # this is temp to handle compat with arch=ppc
252 config PPC_DCR_NATIVE
262 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
265 config PPC_OF_PLATFORM_PCI
267 depends on PPC64 # not supported on 32 bits yet
272 depends on 40x || 44x
277 depends on E200 || E500 || 44x
282 depends on E200 || E500
287 depends on 44x || E500
289 default y if E500 && PHYS_64BIT
292 bool 'Large physical address support' if E500
293 depends on 44x || E500
294 select RESOURCES_64BIT
297 This option enables kernel support for larger than 32-bit physical
298 addresses. This features is not be available on all e500 cores.
300 If in doubt, say N here.
303 bool "AltiVec Support"
304 depends on CLASSIC32 || POWER4
306 This option enables kernel support for the Altivec extensions to the
307 PowerPC processor. The kernel currently supports saving and restoring
308 altivec registers, and turning on the 'altivec enable' bit so user
309 processes can execute altivec instructions.
311 This option is only usefully if you have a processor that supports
312 altivec (G4, otherwise known as 74xx series), but does not have
313 any affect on a non-altivec cpu (it does, however add code to the
316 If in doubt, say Y here.
320 depends on E200 || E500
323 This option enables kernel support for the Signal Processing
324 Extensions (SPE) to the PowerPC processor. The kernel currently
325 supports saving and restoring SPE registers, and turning on the
326 'spe enable' bit so user processes can execute SPE instructions.
328 This option is only useful if you have a processor that supports
329 SPE (e500, otherwise known as 85xx series), but does not have any
330 effect on a non-spe cpu (it does, however add code to the kernel).
332 If in doubt, say Y here.
336 depends on 6xx || POWER3 || POWER4 || PPC64
339 config PPC_STD_MMU_32
341 depends on PPC_STD_MMU && PPC32
345 default y if HUGETLB_PAGE
348 config VIRT_CPU_ACCOUNTING
349 bool "Deterministic task and CPU time accounting"
353 Select this option to enable more accurate task and CPU time
354 accounting. This is done by reading a CPU counter on each
355 kernel entry and exit and on transitions within the kernel
356 between system, softirq and hardirq state, so there is a
357 small performance impact. This also enables accounting of
358 stolen time on logically-partitioned systems running on
359 IBM POWER5-based machines.
361 If in doubt, say Y here.
364 depends on PPC_STD_MMU
365 bool "Symmetric multi-processing support"
367 This enables support for systems with more than one CPU. If you have
368 a system with only one CPU, say N. If you have a system with more
369 than one CPU, say Y. Note that the kernel does not currently
370 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
371 since they have inadequate hardware support for multiprocessor
374 If you say N here, the kernel will run on single and multiprocessor
375 machines, but will use only one CPU of a multiprocessor machine. If
376 you say Y here, the kernel will run on single-processor machines.
377 On a single-processor machine, the kernel will run faster if you say
380 If you don't know what to do here, say N.
383 int "Maximum number of CPUs (2-128)"
386 default "32" if PPC64
389 config NOT_COHERENT_CACHE
391 depends on 4xx || 8xx || E200
394 config CONFIG_CHECK_CACHE_COHERENCY
398 source "init/Kconfig"
400 source "arch/powerpc/platforms/Kconfig"
402 menu "Kernel options"
405 bool "High memory support"
408 source kernel/Kconfig.hz
409 source kernel/Kconfig.preempt
410 source "fs/Kconfig.binfmt"
412 # We optimistically allocate largepages from the VM, so make the limit
413 # large enough (16MB). This badly named config option is actually
415 config FORCE_MAX_ZONEORDER
418 default "9" if PPC_64K_PAGES
421 config MATH_EMULATION
422 bool "Math emulation"
423 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
425 Some PowerPC chips designed for embedded applications do not have
426 a floating-point unit and therefore do not implement the
427 floating-point instructions in the PowerPC instruction set. If you
428 say Y here, the kernel will include code to emulate a floating-point
429 unit, which will allow programs that use floating-point
433 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
434 depends on EXPERIMENTAL && PPC64
437 Cause IO segments sent to a device for DMA to be merged virtually
438 by the IOMMU when they happen to have been allocated contiguously.
439 This doesn't add pressure to the IOMMU allocator. However, some
440 drivers don't support getting large merged segments coming back
441 from *_map_sg(). Say Y if you know the drivers you are using are
442 properly handling this case.
445 bool "Support for enabling/disabling CPUs"
446 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
448 Say Y here to be able to disable and re-enable individual
449 CPUs at runtime on SMP machines.
451 Say N if you are unsure.
453 config ARCH_ENABLE_MEMORY_HOTPLUG
457 bool "kexec system call (EXPERIMENTAL)"
458 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
460 kexec is a system call that implements the ability to shutdown your
461 current kernel, and to start another kernel. It is like a reboot
462 but it is independent of the system firmware. And like a reboot
463 you can start any kernel with it, not just Linux.
465 The name comes from the similarity to the exec system call.
467 It is an ongoing process to be certain the hardware in a machine
468 is properly shutdown, so do not be surprised if this code does not
469 initially work for you. It may help to enable device hotplugging
470 support. As of this writing the exact hardware interface is
471 strongly in flux, so no good recommendation can be made.
474 bool "Build a kdump crash kernel (EXPERIMENTAL)"
475 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
477 Build a kernel suitable for use as a kdump capture kernel.
478 The kernel will be linked at a different address than normal, and
479 so can only be used for Kdump.
481 Don't change this unless you know what you are doing.
484 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
485 default y if PPC_PREP
488 bool "Distribute interrupts on all CPUs by default"
489 depends on SMP && !MV64360
491 This option gives the kernel permission to distribute IRQs across
492 multiple CPUs. Saying N here will route all IRQs to the first
493 CPU. Generally saying Y is safe, although some problems have been
494 reported with SMP Power Macintoshes with this option enabled.
499 default y if SMP && PPC_PSERIES
504 depends on NEED_MULTIPLE_NODES
506 config ARCH_SELECT_MEMORY_MODEL
510 config ARCH_FLATMEM_ENABLE
512 depends on (PPC64 && !NUMA) || PPC32
514 config ARCH_SPARSEMEM_ENABLE
518 config ARCH_SPARSEMEM_DEFAULT
520 depends on (SMP && PPC_PSERIES) || PPC_PS3
522 config ARCH_POPULATES_NODE_MAP
527 config ARCH_MEMORY_PROBE
529 depends on MEMORY_HOTPLUG
531 # Some NUMA nodes have memory ranges that span
532 # other nodes. Even though a pfn is valid and
533 # between a node's start and end pfns, it may not
534 # reside on that node. See memmap_init_zone()
536 config NODES_SPAN_OTHER_NODES
538 depends on NEED_MULTIPLE_NODES
540 config PPC_HAS_HASH_64K
548 select PPC_HAS_HASH_64K
550 This option changes the kernel logical page size to 64k. On machines
551 without processor support for 64k pages, the kernel will simulate
552 them by loading each individual 4k page on demand transparently,
553 while on hardware with such support, it will be used to map
554 normal application pages.
557 bool "SMT (Hyperthreading) scheduler support"
558 depends on PPC64 && SMP
560 SMT scheduler support improves the CPU scheduler's decision making
561 when dealing with POWER5 cpus at a cost of slightly increased
562 overhead in some places. If unsure say N here.
564 config PROC_DEVICETREE
565 bool "Support for device tree in /proc"
568 This option adds a device-tree directory under /proc which contains
569 an image of the device tree that the kernel copies from Open
570 Firmware or other boot firmware. If unsure, say Y here.
573 bool "Default bootloader kernel arguments"
576 string "Initial kernel command string"
577 depends on CMDLINE_BOOL
578 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
580 On some platforms, there is currently no way for the boot loader to
581 pass arguments to the kernel. For these platforms, you can supply
582 some command-line options at build time by entering them here. In
583 most cases you will need to specify the root device here.
586 source kernel/power/Kconfig
590 bool "Enable seccomp to safely compute untrusted bytecode"
594 This kernel feature is useful for number crunching applications
595 that may need to compute untrusted bytecode during their
596 execution. By using pipes or other transports made available to
597 the process as file descriptors supporting the read/write
598 syscalls, it's possible to isolate those applications in
599 their own address space using seccomp. Once seccomp is
600 enabled via /proc/<pid>/seccomp, it cannot be disabled
601 and the task is only allowed to execute a few safe syscalls
602 defined by each seccomp mode.
604 If unsure, say Y. Only embedded should say N here.
606 config WANT_DEVICE_TREE
611 string "Static device tree source file"
612 depends on WANT_DEVICE_TREE
614 This specifies the device tree source (.dts) file to be
615 compiled and included when building the bootwrapper. If a
616 relative filename is given, then it will be relative to
617 arch/powerpc/boot/dts. If you are not using the bootwrapper,
618 or do not need to build a dts into the bootwrapper, this
621 For example, this is required when building a cuImage target
622 for an older U-Boot, which cannot pass a device tree itself.
623 Such a kernel will not work with a newer U-Boot that tries to
624 pass a device tree (unless you tell it not to). If your U-Boot
625 does not mention a device tree in "help bootm", then use the
626 cuImage target and specify a device tree here. Otherwise, use
627 the uImage target and leave this field blank.
638 bool "Support for ISA-bus hardware"
639 depends on PPC_PREP || PPC_CHRP
642 Find out whether you have ISA slots on your motherboard. ISA is the
643 name of a bus system, i.e. the way the CPU talks to the other stuff
644 inside your box. If you have an Apple machine, say N here; if you
645 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
646 you have an embedded board, consult your board documentation.
652 config GENERIC_ISA_DMA
654 depends on PPC64 || POWER4 || 6xx && !CPM2
657 config PPC_INDIRECT_PCI
660 default y if 40x || 44x
663 config PPC_INDIRECT_PCI_BE
665 depends PPC_INDIRECT_PCI
681 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
686 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
687 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
688 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
689 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
690 && !PPC_85xx && !PPC_86xx
691 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
692 default PCI_QSPAN if !4xx && !CPM2 && 8xx
693 select ARCH_SUPPORTS_MSI
695 Find out whether your system includes a PCI bus. PCI is the name of
696 a bus system, i.e. the way the CPU talks to the other stuff inside
697 your box. If you say Y here, the kernel will include drivers and
698 infrastructure code to support PCI bus devices.
708 depends on !4xx && !CPM2 && 8xx
711 Say Y here if you have a system based on a Motorola 8xx-series
712 embedded processor with a QSPAN PCI interface, otherwise say N.
716 depends on PCI && 8260
717 select PPC_INDIRECT_PCI
721 bool "Enable workaround for MPC826x erratum PCI 9"
722 depends on PCI_8260 && !ADS8272
726 prompt "IDMA channel for PCI 9 workaround"
729 config 8260_PCI9_IDMA1
732 config 8260_PCI9_IDMA2
735 config 8260_PCI9_IDMA3
738 config 8260_PCI9_IDMA4
743 source "drivers/pci/pcie/Kconfig"
745 source "drivers/pci/Kconfig"
747 source "drivers/pcmcia/Kconfig"
749 source "drivers/pci/hotplug/Kconfig"
753 menu "Advanced setup"
756 config ADVANCED_OPTIONS
757 bool "Prompt for advanced kernel configuration options"
759 This option will enable prompting for a variety of advanced kernel
760 configuration options. These options can cause the kernel to not
761 work if they are set incorrectly, but can be used to optimize certain
762 aspects of kernel memory management.
764 Unless you know what you are doing, say N here.
766 comment "Default settings for advanced configuration options are used"
767 depends on !ADVANCED_OPTIONS
769 config HIGHMEM_START_BOOL
770 bool "Set high memory pool address"
771 depends on ADVANCED_OPTIONS && HIGHMEM
773 This option allows you to set the base address of the kernel virtual
774 area used to map high memory pages. This can be useful in
775 optimizing the layout of kernel virtual memory.
777 Say N here unless you know what you are doing.
780 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
783 config LOWMEM_SIZE_BOOL
784 bool "Set maximum low memory"
785 depends on ADVANCED_OPTIONS
787 This option allows you to set the maximum amount of memory which
788 will be used as "low memory", that is, memory which the kernel can
789 access directly, without having to set up a kernel virtual mapping.
790 This can be useful in optimizing the layout of kernel virtual
793 Say N here unless you know what you are doing.
796 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
799 config KERNEL_START_BOOL
800 bool "Set custom kernel base address"
801 depends on ADVANCED_OPTIONS
803 This option allows you to set the kernel virtual address at which
804 the kernel will map low memory (the kernel image will be linked at
805 this address). This can be useful in optimizing the virtual memory
806 layout of the system.
808 Say N here unless you know what you are doing.
811 hex "Virtual address of kernel base" if KERNEL_START_BOOL
814 config TASK_SIZE_BOOL
815 bool "Set custom user task size"
816 depends on ADVANCED_OPTIONS
818 This option allows you to set the amount of virtual address space
819 allocated to user tasks. This can be useful in optimizing the
820 virtual memory layout of the system.
822 Say N here unless you know what you are doing.
825 hex "Size of user task space" if TASK_SIZE_BOOL
828 config CONSISTENT_START_BOOL
829 bool "Set custom consistent memory pool address"
830 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
832 This option allows you to set the base virtual address
833 of the consistent memory pool. This pool of virtual
834 memory is used to make consistent memory allocations.
836 config CONSISTENT_START
837 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
838 default "0xff100000" if NOT_COHERENT_CACHE
840 config CONSISTENT_SIZE_BOOL
841 bool "Set custom consistent memory pool size"
842 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
844 This option allows you to set the size of the
845 consistent memory pool. This pool of virtual memory
846 is used to make consistent memory allocations.
848 config CONSISTENT_SIZE
849 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
850 default "0x00200000" if NOT_COHERENT_CACHE
852 config BOOT_LOAD_BOOL
853 bool "Set the boot link/load address"
854 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
856 This option allows you to set the initial load address of the zImage
857 or zImage.initrd file. This can be useful if you are on a board
858 which has a small amount of memory.
860 Say N here unless you know what you are doing.
863 hex "Link/load address for booting" if BOOT_LOAD_BOOL
864 default "0x00400000" if 40x || 8xx || 8260
865 default "0x01000000" if 44x
869 bool "Pinned Kernel TLBs (860 ONLY)"
870 depends on ADVANCED_OPTIONS && 8xx
876 default "0xc000000000000000"
881 source "drivers/Kconfig"
885 # XXX source "arch/ppc/8xx_io/Kconfig"
887 # XXX source "arch/ppc/8260_io/Kconfig"
889 source "arch/powerpc/sysdev/qe_lib/Kconfig"
893 menu "Instrumentation Support"
894 depends on EXPERIMENTAL
896 source "arch/powerpc/oprofile/Kconfig"
899 bool "Kprobes (EXPERIMENTAL)"
900 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
902 Kprobes allows you to trap at almost any kernel address and
903 execute a callback function. register_kprobe() establishes
904 a probepoint and specifies the callback. Kprobes is useful
905 for kernel debugging, non-intrusive instrumentation and testing.
906 If in doubt, say "N".
909 source "arch/powerpc/Kconfig.debug"
911 source "security/Kconfig"
915 depends on COMPAT && KEYS
918 source "crypto/Kconfig"