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
29 config GENERIC_HARDIRQS
37 config RWSEM_GENERIC_SPINLOCK
40 config RWSEM_XCHGADD_ALGORITHM
44 config ARCH_HAS_ILOG2_U32
48 config ARCH_HAS_ILOG2_U64
52 config GENERIC_HWEIGHT
56 config GENERIC_CALIBRATE_DELAY
60 config GENERIC_FIND_NEXT_BIT
78 depends on COMPAT && SYSVIPC
81 # All PPC32s use generic nvram driver through ppc_md
86 config SCHED_NO_NO_OMIT_FRAME_POINTER
90 config ARCH_MAY_HAVE_PC_FDC
92 default !PPC_PSERIES || PCI
101 config GENERIC_TBSYNC
103 default y if PPC32 && SMP
115 config DEFAULT_UIMAGE
118 Used to allow a board to specify it wants a uImage built by default
121 menu "Processor support"
123 prompt "Processor Type"
128 bool "52xx/6xx/7xx/74xx"
132 There are four families of PowerPC chips supported. The more common
133 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
134 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
135 embedded versions (403 and 405) and the high end 64 bit Power
136 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
138 This option is the catch-all for 6xx types, including some of the
139 embedded versions. Unless there is see an option for the specific
140 chip family you are using, you want this option.
142 You do not want this if you are building a kernel for a 64 bit
143 IBM RS/6000 or an Apple G5, choose 6xx.
145 If unsure, select this option
147 Note that the kernel runs in 32-bit mode even on 64-bit chips.
150 bool "Freescale 82xx"
155 bool "Freescale 83xx"
162 bool "Freescale 85xx"
168 bool "Freescale 86xx"
174 The Freescale E600 SoCs have 74xx cores.
183 select PPC_DCR_NATIVE
187 select PPC_DCR_NATIVE
191 bool "Freescale e200"
196 bool "Optimize for POWER4"
200 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
201 The resulting binary will not work on POWER3 or RS64 processors
202 when compiled with binutils 2.15 or later.
207 default y if !POWER4_ONLY
216 # this is temp to handle compat with arch=ppc
220 # this is temp to handle compat with arch=ppc
224 # this is temp to handle compat with arch=ppc
235 config PPC_DCR_NATIVE
245 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
248 config PPC_OF_PLATFORM_PCI
250 depends on PPC64 # not supported on 32 bits yet
255 depends on E200 || E500
260 depends on E200 || E500
265 depends on 44x || E500
267 default y if E500 && PHYS_64BIT
270 bool 'Large physical address support' if E500
271 depends on 44x || E500
272 select RESOURCES_64BIT
275 This option enables kernel support for larger than 32-bit physical
276 addresses. This features is not be available on all e500 cores.
278 If in doubt, say N here.
281 bool "AltiVec Support"
282 depends on CLASSIC32 || POWER4
284 This option enables kernel support for the Altivec extensions to the
285 PowerPC processor. The kernel currently supports saving and restoring
286 altivec registers, and turning on the 'altivec enable' bit so user
287 processes can execute altivec instructions.
289 This option is only usefully if you have a processor that supports
290 altivec (G4, otherwise known as 74xx series), but does not have
291 any affect on a non-altivec cpu (it does, however add code to the
294 If in doubt, say Y here.
298 depends on E200 || E500
301 This option enables kernel support for the Signal Processing
302 Extensions (SPE) to the PowerPC processor. The kernel currently
303 supports saving and restoring SPE registers, and turning on the
304 'spe enable' bit so user processes can execute SPE instructions.
306 This option is only useful if you have a processor that supports
307 SPE (e500, otherwise known as 85xx series), but does not have any
308 effect on a non-spe cpu (it does, however add code to the kernel).
310 If in doubt, say Y here.
314 depends on 6xx || POWER3 || POWER4 || PPC64
317 config PPC_STD_MMU_32
319 depends on PPC_STD_MMU && PPC32
321 config VIRT_CPU_ACCOUNTING
322 bool "Deterministic task and CPU time accounting"
326 Select this option to enable more accurate task and CPU time
327 accounting. This is done by reading a CPU counter on each
328 kernel entry and exit and on transitions within the kernel
329 between system, softirq and hardirq state, so there is a
330 small performance impact. This also enables accounting of
331 stolen time on logically-partitioned systems running on
332 IBM POWER5-based machines.
334 If in doubt, say Y here.
337 depends on PPC_STD_MMU
338 bool "Symmetric multi-processing support"
340 This enables support for systems with more than one CPU. If you have
341 a system with only one CPU, say N. If you have a system with more
342 than one CPU, say Y. Note that the kernel does not currently
343 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
344 since they have inadequate hardware support for multiprocessor
347 If you say N here, the kernel will run on single and multiprocessor
348 machines, but will use only one CPU of a multiprocessor machine. If
349 you say Y here, the kernel will run on single-processor machines.
350 On a single-processor machine, the kernel will run faster if you say
353 If you don't know what to do here, say N.
356 int "Maximum number of CPUs (2-128)"
359 default "32" if PPC64
362 config NOT_COHERENT_CACHE
364 depends on 4xx || 8xx || E200
368 source "init/Kconfig"
370 menu "Platform support"
371 depends on PPC64 || CLASSIC32
374 prompt "Machine type"
375 default PPC_MULTIPLATFORM
377 config PPC_MULTIPLATFORM
378 bool "Generic desktop/server/laptop"
380 Select this option if configuring for an IBM pSeries or
381 RS/6000 machine, an Apple machine, or a PReP, CHRP,
382 Maple or Cell-based machine.
385 bool "Embedded 6xx/7xx/7xxx-based board"
386 depends on PPC32 && (BROKEN||BROKEN_ON_SMP)
390 depends on PPC32 && BROKEN
392 Select APUS if configuring for a PowerUP Amiga.
393 More information is available at:
394 <http://linux-apus.sourceforge.net/>.
399 depends on PPC_MPC836x || PPC_MPC832x
402 The QUICC Engine (QE) is a new generation of communications
403 coprocessors on Freescale embedded CPUs (akin to CPM in older chips).
404 Selecting this option means that you wish to build a kernel
405 for a machine with a QE coprocessor.
407 source "arch/powerpc/platforms/pseries/Kconfig"
408 source "arch/powerpc/platforms/iseries/Kconfig"
409 source "arch/powerpc/platforms/chrp/Kconfig"
410 source "arch/powerpc/platforms/52xx/Kconfig"
411 source "arch/powerpc/platforms/powermac/Kconfig"
412 source "arch/powerpc/platforms/prep/Kconfig"
413 source "arch/powerpc/platforms/maple/Kconfig"
414 source "arch/powerpc/platforms/pasemi/Kconfig"
415 source arch/powerpc/platforms/celleb/Kconfig
416 source arch/powerpc/platforms/ps3/Kconfig
417 source arch/powerpc/platforms/cell/Kconfig
421 depends on PPC_MULTIPLATFORM
423 Support for running natively on the hardware, i.e. without
424 a hypervisor. This option is not user-selectable but should
425 be selected by all platforms that need it.
427 config UDBG_RTAS_CONSOLE
428 bool "RTAS based debug console"
433 bool "BEAT based debug console"
434 depends on PPC_CELLEB
438 depends on PPC_PSERIES
444 depends on PPC_MULTIPLATFORM && PPC64
451 config RTAS_ERROR_LOGGING
457 bool "Proc interface to RTAS"
462 tristate "Firmware flash interface"
463 depends on PPC64 && RTAS_PROC
466 tristate "Support for PMI"
467 depends PPC_IBM_CELL_BLADE
469 PMI (Platform Management Interrupt) is a way to
470 communicate with the BMC (Baseboard Mangement Controller).
471 It is used in some IBM Cell blades.
478 config MPIC_BROKEN_U3
484 depends on PPC_PSERIES || PPC_ISERIES
489 depends on PPC_PSERIES
490 bool "Support for GX bus based adapters"
492 Bus device driver for GX bus based adapters.
502 config PPC_INDIRECT_IO
511 source "drivers/cpufreq/Kconfig"
514 bool "Support for Apple PowerBooks"
515 depends on CPU_FREQ && ADB_PMU && PPC32
516 select CPU_FREQ_TABLE
518 This adds support for frequency switching on Apple PowerBooks,
519 this currently includes some models of iBook & Titanium
522 config CPU_FREQ_PMAC64
523 bool "Support for some Apple G5s"
524 depends on CPU_FREQ && PPC64
525 select CPU_FREQ_TABLE
527 This adds support for frequency switching on Apple iMac G5,
528 and some of the more recent desktop G5 machines as well.
530 config PPC601_SYNC_FIX
531 bool "Workarounds for PPC601 bugs"
532 depends on 6xx && (PPC_PREP || PPC_PMAC)
534 Some versions of the PPC601 (the first PowerPC chip) have bugs which
535 mean that extra synchronization instructions are required near
536 certain instructions, typically those that make major changes to the
537 CPU state. These extra instructions reduce performance slightly.
538 If you say N here, these extra instructions will not be included,
539 resulting in a kernel which will run faster but may not run at all
540 on some systems with the PPC601 chip.
542 If in doubt, say Y here.
545 bool "On-chip CPU temperature sensor support"
548 G3 and G4 processors have an on-chip temperature sensor called the
549 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
550 temperature within 2-4 degrees Celsius. This option shows the current
551 on-die temperature in /proc/cpuinfo if the cpu supports it.
553 Unfortunately, on some chip revisions, this sensor is very inaccurate
554 and in many cases, does not work at all, so don't assume the cpu
555 temp is actually what /proc/cpuinfo says it is.
558 bool "Interrupt driven TAU driver (DANGEROUS)"
561 The TAU supports an interrupt driven mode which causes an interrupt
562 whenever the temperature goes out of range. This is the fastest way
563 to get notified the temp has exceeded a range. With this option off,
564 a timer is used to re-check the temperature periodically.
566 However, on some cpus it appears that the TAU interrupt hardware
567 is buggy and can cause a situation which would lead unexplained hard
570 Unless you are extending the TAU driver, or enjoy kernel/hardware
571 debugging, leave this option off.
574 bool "Average high and low temp"
577 The TAU hardware can compare the temperature to an upper and lower
578 bound. The default behavior is to show both the upper and lower
579 bound in /proc/cpuinfo. If the range is large, the temperature is
580 either changing a lot, or the TAU hardware is broken (likely on some
581 G4's). If the range is small (around 4 degrees), the temperature is
582 relatively stable. If you say Y here, a single temperature value,
583 halfway between the upper and lower bounds, will be reported in
586 If in doubt, say N here.
590 source arch/powerpc/platforms/embedded6xx/Kconfig
591 source arch/powerpc/platforms/4xx/Kconfig
592 source arch/powerpc/platforms/82xx/Kconfig
593 source arch/powerpc/platforms/83xx/Kconfig
594 source arch/powerpc/platforms/85xx/Kconfig
595 source arch/powerpc/platforms/86xx/Kconfig
596 source arch/powerpc/platforms/8xx/Kconfig
598 menu "Kernel options"
601 bool "High memory support"
604 source kernel/Kconfig.hz
605 source kernel/Kconfig.preempt
606 source "fs/Kconfig.binfmt"
608 # We optimistically allocate largepages from the VM, so make the limit
609 # large enough (16MB). This badly named config option is actually
611 config FORCE_MAX_ZONEORDER
614 default "9" if PPC_64K_PAGES
617 config MATH_EMULATION
618 bool "Math emulation"
619 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
621 Some PowerPC chips designed for embedded applications do not have
622 a floating-point unit and therefore do not implement the
623 floating-point instructions in the PowerPC instruction set. If you
624 say Y here, the kernel will include code to emulate a floating-point
625 unit, which will allow programs that use floating-point
629 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
630 depends on EXPERIMENTAL && PPC64
633 Cause IO segments sent to a device for DMA to be merged virtually
634 by the IOMMU when they happen to have been allocated contiguously.
635 This doesn't add pressure to the IOMMU allocator. However, some
636 drivers don't support getting large merged segments coming back
637 from *_map_sg(). Say Y if you know the drivers you are using are
638 properly handling this case.
641 bool "Support for enabling/disabling CPUs"
642 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
644 Say Y here to be able to disable and re-enable individual
645 CPUs at runtime on SMP machines.
647 Say N if you are unsure.
649 config ARCH_ENABLE_MEMORY_HOTPLUG
653 bool "kexec system call (EXPERIMENTAL)"
654 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
656 kexec is a system call that implements the ability to shutdown your
657 current kernel, and to start another kernel. It is like a reboot
658 but it is independent of the system firmware. And like a reboot
659 you can start any kernel with it, not just Linux.
661 The name comes from the similarity to the exec system call.
663 It is an ongoing process to be certain the hardware in a machine
664 is properly shutdown, so do not be surprised if this code does not
665 initially work for you. It may help to enable device hotplugging
666 support. As of this writing the exact hardware interface is
667 strongly in flux, so no good recommendation can be made.
670 bool "Build a kdump crash kernel (EXPERIMENTAL)"
671 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
673 Build a kernel suitable for use as a kdump capture kernel.
674 The kernel will be linked at a different address than normal, and
675 so can only be used for Kdump.
677 Don't change this unless you know what you are doing.
681 depends on 8xx || 8260
685 bool "PC PS/2 style Keyboard"
686 depends on 4xx || CPM2
689 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
690 default y if PPC_PREP
693 bool "Distribute interrupts on all CPUs by default"
694 depends on SMP && !MV64360
696 This option gives the kernel permission to distribute IRQs across
697 multiple CPUs. Saying N here will route all IRQs to the first
698 CPU. Generally saying Y is safe, although some problems have been
699 reported with SMP Power Macintoshes with this option enabled.
705 default y if SMP && PPC_PSERIES
710 depends on NEED_MULTIPLE_NODES
712 config ARCH_SELECT_MEMORY_MODEL
716 config ARCH_FLATMEM_ENABLE
718 depends on (PPC64 && !NUMA) || PPC32
720 config ARCH_SPARSEMEM_ENABLE
724 config ARCH_SPARSEMEM_DEFAULT
726 depends on (SMP && PPC_PSERIES) || PPC_PS3
728 config ARCH_POPULATES_NODE_MAP
733 config ARCH_MEMORY_PROBE
735 depends on MEMORY_HOTPLUG
737 # Some NUMA nodes have memory ranges that span
738 # other nodes. Even though a pfn is valid and
739 # between a node's start and end pfns, it may not
740 # reside on that node. See memmap_init_zone()
742 config NODES_SPAN_OTHER_NODES
744 depends on NEED_MULTIPLE_NODES
750 This option changes the kernel logical page size to 64k. On machines
751 without processor support for 64k pages, the kernel will simulate
752 them by loading each individual 4k page on demand transparently,
753 while on hardware with such support, it will be used to map
754 normal application pages.
757 bool "SMT (Hyperthreading) scheduler support"
758 depends on PPC64 && SMP
760 SMT scheduler support improves the CPU scheduler's decision making
761 when dealing with POWER5 cpus at a cost of slightly increased
762 overhead in some places. If unsure say N here.
764 config PROC_DEVICETREE
765 bool "Support for device tree in /proc"
768 This option adds a device-tree directory under /proc which contains
769 an image of the device tree that the kernel copies from Open
770 Firmware or other boot firmware. If unsure, say Y here.
773 bool "Default bootloader kernel arguments"
776 string "Initial kernel command string"
777 depends on CMDLINE_BOOL
778 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
780 On some platforms, there is currently no way for the boot loader to
781 pass arguments to the kernel. For these platforms, you can supply
782 some command-line options at build time by entering them here. In
783 most cases you will need to specify the root device here.
786 source kernel/power/Kconfig
790 bool "Enable seccomp to safely compute untrusted bytecode"
794 This kernel feature is useful for number crunching applications
795 that may need to compute untrusted bytecode during their
796 execution. By using pipes or other transports made available to
797 the process as file descriptors supporting the read/write
798 syscalls, it's possible to isolate those applications in
799 their own address space using seccomp. Once seccomp is
800 enabled via /proc/<pid>/seccomp, it cannot be disabled
801 and the task is only allowed to execute a few safe syscalls
802 defined by each seccomp mode.
804 If unsure, say Y. Only embedded should say N here.
815 bool "Support for ISA-bus hardware"
816 depends on PPC_PREP || PPC_CHRP
819 Find out whether you have ISA slots on your motherboard. ISA is the
820 name of a bus system, i.e. the way the CPU talks to the other stuff
821 inside your box. If you have an Apple machine, say N here; if you
822 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
823 you have an embedded board, consult your board documentation.
829 config GENERIC_ISA_DMA
831 depends on PPC64 || POWER4 || 6xx && !CPM2
846 config PPC_INDIRECT_PCI
849 default y if 40x || 44x
861 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
866 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
867 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
868 || MPC7448HPC2 || PPC_PS3
869 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
870 && !PPC_85xx && !PPC_86xx
871 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
872 default PCI_QSPAN if !4xx && !CPM2 && 8xx
874 Find out whether your system includes a PCI bus. PCI is the name of
875 a bus system, i.e. the way the CPU talks to the other stuff inside
876 your box. If you say Y here, the kernel will include drivers and
877 infrastructure code to support PCI bus devices.
885 depends on !4xx && !CPM2 && 8xx
888 Say Y here if you have a system based on a Motorola 8xx-series
889 embedded processor with a QSPAN PCI interface, otherwise say N.
893 depends on PCI && 8260
894 select PPC_INDIRECT_PCI
898 bool "Enable workaround for MPC826x erratum PCI 9"
899 depends on PCI_8260 && !ADS8272
903 prompt "IDMA channel for PCI 9 workaround"
906 config 8260_PCI9_IDMA1
909 config 8260_PCI9_IDMA2
912 config 8260_PCI9_IDMA3
915 config 8260_PCI9_IDMA4
920 source "drivers/pci/pcie/Kconfig"
922 source "drivers/pci/Kconfig"
924 source "drivers/pcmcia/Kconfig"
926 source "drivers/pci/hotplug/Kconfig"
930 menu "Advanced setup"
933 config ADVANCED_OPTIONS
934 bool "Prompt for advanced kernel configuration options"
936 This option will enable prompting for a variety of advanced kernel
937 configuration options. These options can cause the kernel to not
938 work if they are set incorrectly, but can be used to optimize certain
939 aspects of kernel memory management.
941 Unless you know what you are doing, say N here.
943 comment "Default settings for advanced configuration options are used"
944 depends on !ADVANCED_OPTIONS
946 config HIGHMEM_START_BOOL
947 bool "Set high memory pool address"
948 depends on ADVANCED_OPTIONS && HIGHMEM
950 This option allows you to set the base address of the kernel virtual
951 area used to map high memory pages. This can be useful in
952 optimizing the layout of kernel virtual memory.
954 Say N here unless you know what you are doing.
957 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
960 config LOWMEM_SIZE_BOOL
961 bool "Set maximum low memory"
962 depends on ADVANCED_OPTIONS
964 This option allows you to set the maximum amount of memory which
965 will be used as "low memory", that is, memory which the kernel can
966 access directly, without having to set up a kernel virtual mapping.
967 This can be useful in optimizing the layout of kernel virtual
970 Say N here unless you know what you are doing.
973 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
976 config KERNEL_START_BOOL
977 bool "Set custom kernel base address"
978 depends on ADVANCED_OPTIONS
980 This option allows you to set the kernel virtual address at which
981 the kernel will map low memory (the kernel image will be linked at
982 this address). This can be useful in optimizing the virtual memory
983 layout of the system.
985 Say N here unless you know what you are doing.
988 hex "Virtual address of kernel base" if KERNEL_START_BOOL
991 config TASK_SIZE_BOOL
992 bool "Set custom user task size"
993 depends on ADVANCED_OPTIONS
995 This option allows you to set the amount of virtual address space
996 allocated to user tasks. This can be useful in optimizing the
997 virtual memory layout of the system.
999 Say N here unless you know what you are doing.
1002 hex "Size of user task space" if TASK_SIZE_BOOL
1003 default "0x80000000"
1005 config CONSISTENT_START_BOOL
1006 bool "Set custom consistent memory pool address"
1007 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1009 This option allows you to set the base virtual address
1010 of the consistent memory pool. This pool of virtual
1011 memory is used to make consistent memory allocations.
1013 config CONSISTENT_START
1014 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
1015 default "0xff100000" if NOT_COHERENT_CACHE
1017 config CONSISTENT_SIZE_BOOL
1018 bool "Set custom consistent memory pool size"
1019 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1021 This option allows you to set the size of the
1022 consistent memory pool. This pool of virtual memory
1023 is used to make consistent memory allocations.
1025 config CONSISTENT_SIZE
1026 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1027 default "0x00200000" if NOT_COHERENT_CACHE
1029 config BOOT_LOAD_BOOL
1030 bool "Set the boot link/load address"
1031 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1033 This option allows you to set the initial load address of the zImage
1034 or zImage.initrd file. This can be useful if you are on a board
1035 which has a small amount of memory.
1037 Say N here unless you know what you are doing.
1040 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1041 default "0x00400000" if 40x || 8xx || 8260
1042 default "0x01000000" if 44x
1043 default "0x00800000"
1046 bool "Pinned Kernel TLBs (860 ONLY)"
1047 depends on ADVANCED_OPTIONS && 8xx
1053 default "0xc000000000000000"
1056 source "net/Kconfig"
1058 source "drivers/Kconfig"
1062 # XXX source "arch/ppc/8xx_io/Kconfig"
1064 # XXX source "arch/ppc/8260_io/Kconfig"
1066 source "arch/powerpc/sysdev/qe_lib/Kconfig"
1069 source "lib/Kconfig"
1071 menu "Instrumentation Support"
1072 depends on EXPERIMENTAL
1074 source "arch/powerpc/oprofile/Kconfig"
1077 bool "Kprobes (EXPERIMENTAL)"
1078 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
1080 Kprobes allows you to trap at almost any kernel address and
1081 execute a callback function. register_kprobe() establishes
1082 a probepoint and specifies the callback. Kprobes is useful
1083 for kernel debugging, non-intrusive instrumentation and testing.
1084 If in doubt, say "N".
1087 source "arch/powerpc/Kconfig.debug"
1089 source "security/Kconfig"
1093 depends on COMPAT && KEYS
1096 source "crypto/Kconfig"