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 GENERIC_HWEIGHT
48 config GENERIC_CALIBRATE_DELAY
52 config GENERIC_FIND_NEXT_BIT
70 depends on COMPAT && SYSVIPC
73 # All PPC32s use generic nvram driver through ppc_md
78 config SCHED_NO_NO_OMIT_FRAME_POINTER
82 config ARCH_MAY_HAVE_PC_FDC
95 default y if PPC32 && SMP
102 config DEFAULT_UIMAGE
105 Used to allow a board to specify it wants a uImage built by default
108 menu "Processor support"
110 prompt "Processor Type"
119 There are four families of PowerPC chips supported. The more common
120 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
121 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
122 embedded versions (403 and 405) and the high end 64 bit Power
123 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
125 Unless you are building a kernel for one of the embedded processor
126 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
127 Note that the kernel runs in 32-bit mode even on 64-bit chips.
130 bool "Freescale 52xx"
135 bool "Freescale 82xx"
140 bool "Freescale 83xx"
147 bool "Freescale 85xx"
153 bool "Freescale 86xx"
159 The Freescale E600 SoCs have 74xx cores.
171 bool "Freescale e200"
176 bool "Optimize for POWER4"
180 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
181 The resulting binary will not work on POWER3 or RS64 processors
182 when compiled with binutils 2.15 or later.
187 default y if !POWER4_ONLY
196 # this is temp to handle compat with arch=ppc
200 # this is temp to handle compat with arch=ppc
213 depends on E200 || E500
218 depends on E200 || E500
223 depends on 44x || E500
225 default y if E500 && PHYS_64BIT
228 bool 'Large physical address support' if E500
229 depends on 44x || E500
232 This option enables kernel support for larger than 32-bit physical
233 addresses. This features is not be available on all e500 cores.
235 If in doubt, say N here.
238 bool "AltiVec Support"
239 depends on CLASSIC32 || POWER4
241 This option enables kernel support for the Altivec extensions to the
242 PowerPC processor. The kernel currently supports saving and restoring
243 altivec registers, and turning on the 'altivec enable' bit so user
244 processes can execute altivec instructions.
246 This option is only usefully if you have a processor that supports
247 altivec (G4, otherwise known as 74xx series), but does not have
248 any affect on a non-altivec cpu (it does, however add code to the
251 If in doubt, say Y here.
255 depends on E200 || E500
258 This option enables kernel support for the Signal Processing
259 Extensions (SPE) to the PowerPC processor. The kernel currently
260 supports saving and restoring SPE registers, and turning on the
261 'spe enable' bit so user processes can execute SPE instructions.
263 This option is only useful if you have a processor that supports
264 SPE (e500, otherwise known as 85xx series), but does not have any
265 effect on a non-spe cpu (it does, however add code to the kernel).
267 If in doubt, say Y here.
271 depends on 6xx || POWER3 || POWER4 || PPC64
274 config PPC_STD_MMU_32
276 depends on PPC_STD_MMU && PPC32
278 config VIRT_CPU_ACCOUNTING
279 bool "Deterministic task and CPU time accounting"
283 Select this option to enable more accurate task and CPU time
284 accounting. This is done by reading a CPU counter on each
285 kernel entry and exit and on transitions within the kernel
286 between system, softirq and hardirq state, so there is a
287 small performance impact. This also enables accounting of
288 stolen time on logically-partitioned systems running on
289 IBM POWER5-based machines.
291 If in doubt, say Y here.
294 depends on PPC_STD_MMU
295 bool "Symmetric multi-processing support"
297 This enables support for systems with more than one CPU. If you have
298 a system with only one CPU, say N. If you have a system with more
299 than one CPU, say Y. Note that the kernel does not currently
300 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
301 since they have inadequate hardware support for multiprocessor
304 If you say N here, the kernel will run on single and multiprocessor
305 machines, but will use only one CPU of a multiprocessor machine. If
306 you say Y here, the kernel will run on single-processor machines.
307 On a single-processor machine, the kernel will run faster if you say
310 If you don't know what to do here, say N.
313 int "Maximum number of CPUs (2-128)"
316 default "32" if PPC64
319 config NOT_COHERENT_CACHE
321 depends on 4xx || 8xx || E200
325 source "init/Kconfig"
327 menu "Platform support"
328 depends on PPC64 || CLASSIC32
331 prompt "Machine type"
332 default PPC_MULTIPLATFORM
334 config PPC_MULTIPLATFORM
335 bool "Generic desktop/server/laptop"
337 Select this option if configuring for an IBM pSeries or
338 RS/6000 machine, an Apple machine, or a PReP, CHRP,
339 Maple or Cell-based machine.
342 bool "IBM Legacy iSeries"
346 bool "Embedded 6xx/7xx/7xxx-based board"
347 depends on PPC32 && (BROKEN||BROKEN_ON_SMP)
351 depends on PPC32 && BROKEN
353 Select APUS if configuring for a PowerUP Amiga.
354 More information is available at:
355 <http://linux-apus.sourceforge.net/>.
359 depends on PPC_MULTIPLATFORM && PPC64
360 bool "IBM pSeries & new (POWER5-based) iSeries"
364 select RTAS_ERROR_LOGGING
365 select PPC_UDBG_16550
369 bool "Common Hardware Reference Platform (CHRP) based machines"
370 depends on PPC_MULTIPLATFORM && PPC32
373 select PPC_INDIRECT_PCI
376 select PPC_UDBG_16550
380 bool "Apple PowerMac based machines"
381 depends on PPC_MULTIPLATFORM
383 select PPC_INDIRECT_PCI if PPC32
384 select PPC_MPC106 if PPC32
389 depends on PPC_PMAC && POWER4
392 select MPIC_BROKEN_U3
393 select GENERIC_TBSYNC
398 bool "PowerPC Reference Platform (PReP) based machines"
399 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
402 select PPC_INDIRECT_PCI
403 select PPC_UDBG_16550
407 depends on PPC_MULTIPLATFORM && PPC64
408 bool "Maple 970FX Evaluation Board"
411 select MPIC_BROKEN_U3
412 select GENERIC_TBSYNC
413 select PPC_UDBG_16550
417 This option enables support for the Maple 970FX Evaluation Board.
418 For more informations, refer to <http://www.970eval.com>
424 config PPC_CELL_NATIVE
429 config PPC_IBM_CELL_BLADE
430 bool "IBM Cell Blade"
431 depends on PPC_MULTIPLATFORM && PPC64
432 select PPC_CELL_NATIVE
435 select PPC_UDBG_16550
436 select UDBG_RTAS_CONSOLE
438 config UDBG_RTAS_CONSOLE
442 # Systemsim configuration
444 bool " IBM Full System Simulator (systemsim) support"
447 Support booting resulting image under IBMs Full System Simulator.
450 tristate " IBM Full System Simulator Bogus Disk Support"
453 Provides quick access to disk images in the simulator without
454 simulating a full IDE or SCSI device.
457 tristate " IBM Full System Simulator Bogus Network Support"
460 Provides quick access to a raw ethernet device in the simulator
461 without simulating any specific network device hardware.
464 depends on PPC_PSERIES
470 depends on PPC_MULTIPLATFORM && PPC64
477 config RTAS_ERROR_LOGGING
483 bool "Proc interface to RTAS"
488 tristate "Firmware flash interface"
489 depends on PPC64 && RTAS_PROC
495 config MPIC_BROKEN_U3
501 depends on PPC_PSERIES || PPC_ISERIES
506 depends on PPC_PSERIES
507 bool "Support for GX bus based adapters"
509 Bus device driver for GX bus based adapters.
519 source "drivers/cpufreq/Kconfig"
522 bool "Support for Apple PowerBooks"
523 depends on CPU_FREQ && ADB_PMU && PPC32
524 select CPU_FREQ_TABLE
526 This adds support for frequency switching on Apple PowerBooks,
527 this currently includes some models of iBook & Titanium
530 config CPU_FREQ_PMAC64
531 bool "Support for some Apple G5s"
532 depends on CPU_FREQ && PPC64
533 select CPU_FREQ_TABLE
535 This adds support for frequency switching on Apple iMac G5,
536 and some of the more recent desktop G5 machines as well.
538 config PPC601_SYNC_FIX
539 bool "Workarounds for PPC601 bugs"
540 depends on 6xx && (PPC_PREP || PPC_PMAC)
542 Some versions of the PPC601 (the first PowerPC chip) have bugs which
543 mean that extra synchronization instructions are required near
544 certain instructions, typically those that make major changes to the
545 CPU state. These extra instructions reduce performance slightly.
546 If you say N here, these extra instructions will not be included,
547 resulting in a kernel which will run faster but may not run at all
548 on some systems with the PPC601 chip.
550 If in doubt, say Y here.
553 bool "On-chip CPU temperature sensor support"
556 G3 and G4 processors have an on-chip temperature sensor called the
557 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
558 temperature within 2-4 degrees Celsius. This option shows the current
559 on-die temperature in /proc/cpuinfo if the cpu supports it.
561 Unfortunately, on some chip revisions, this sensor is very inaccurate
562 and in many cases, does not work at all, so don't assume the cpu
563 temp is actually what /proc/cpuinfo says it is.
566 bool "Interrupt driven TAU driver (DANGEROUS)"
569 The TAU supports an interrupt driven mode which causes an interrupt
570 whenever the temperature goes out of range. This is the fastest way
571 to get notified the temp has exceeded a range. With this option off,
572 a timer is used to re-check the temperature periodically.
574 However, on some cpus it appears that the TAU interrupt hardware
575 is buggy and can cause a situation which would lead unexplained hard
578 Unless you are extending the TAU driver, or enjoy kernel/hardware
579 debugging, leave this option off.
582 bool "Average high and low temp"
585 The TAU hardware can compare the temperature to an upper and lower
586 bound. The default behavior is to show both the upper and lower
587 bound in /proc/cpuinfo. If the range is large, the temperature is
588 either changing a lot, or the TAU hardware is broken (likely on some
589 G4's). If the range is small (around 4 degrees), the temperature is
590 relatively stable. If you say Y here, a single temperature value,
591 halfway between the upper and lower bounds, will be reported in
594 If in doubt, say N here.
597 depends on EMBEDDED6xx
598 bool "Generic Time-of-day Clock (TODC) support"
600 This adds support for many TODC/RTC chips.
604 source arch/powerpc/platforms/embedded6xx/Kconfig
605 source arch/powerpc/platforms/4xx/Kconfig
606 source arch/powerpc/platforms/83xx/Kconfig
607 source arch/powerpc/platforms/85xx/Kconfig
608 source arch/powerpc/platforms/86xx/Kconfig
609 source arch/powerpc/platforms/8xx/Kconfig
610 source arch/powerpc/platforms/cell/Kconfig
612 menu "Kernel options"
615 bool "High memory support"
618 source kernel/Kconfig.hz
619 source kernel/Kconfig.preempt
620 source "fs/Kconfig.binfmt"
622 # We optimistically allocate largepages from the VM, so make the limit
623 # large enough (16MB). This badly named config option is actually
625 config FORCE_MAX_ZONEORDER
628 default "9" if PPC_64K_PAGES
631 config MATH_EMULATION
632 bool "Math emulation"
633 depends on 4xx || 8xx || E200 || E500
635 Some PowerPC chips designed for embedded applications do not have
636 a floating-point unit and therefore do not implement the
637 floating-point instructions in the PowerPC instruction set. If you
638 say Y here, the kernel will include code to emulate a floating-point
639 unit, which will allow programs that use floating-point
643 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
644 depends on EXPERIMENTAL && PPC64
647 Cause IO segments sent to a device for DMA to be merged virtually
648 by the IOMMU when they happen to have been allocated contiguously.
649 This doesn't add pressure to the IOMMU allocator. However, some
650 drivers don't support getting large merged segments coming back
651 from *_map_sg(). Say Y if you know the drivers you are using are
652 properly handling this case.
655 bool "Support for enabling/disabling CPUs"
656 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
658 Say Y here to be able to disable and re-enable individual
659 CPUs at runtime on SMP machines.
661 Say N if you are unsure.
663 config ARCH_ENABLE_MEMORY_HOTPLUG
667 bool "kexec system call (EXPERIMENTAL)"
668 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
670 kexec is a system call that implements the ability to shutdown your
671 current kernel, and to start another kernel. It is like a reboot
672 but it is independent of the system firmware. And like a reboot
673 you can start any kernel with it, not just Linux.
675 The name comes from the similarity to the exec system call.
677 It is an ongoing process to be certain the hardware in a machine
678 is properly shutdown, so do not be surprised if this code does not
679 initially work for you. It may help to enable device hotplugging
680 support. As of this writing the exact hardware interface is
681 strongly in flux, so no good recommendation can be made.
684 bool "Build a kdump crash kernel (EXPERIMENTAL)"
685 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
687 Build a kernel suitable for use as a kdump capture kernel.
688 The kernel will be linked at a different address than normal, and
689 so can only be used for Kdump.
691 Don't change this unless you know what you are doing.
695 depends on 8xx || 8260
699 bool "PC PS/2 style Keyboard"
700 depends on 4xx || CPM2
703 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
704 default y if PPC_PREP
707 bool "Distribute interrupts on all CPUs by default"
708 depends on SMP && !MV64360
710 This option gives the kernel permission to distribute IRQs across
711 multiple CPUs. Saying N here will route all IRQs to the first
712 CPU. Generally saying Y is safe, although some problems have been
713 reported with SMP Power Macintoshes with this option enabled.
715 source "arch/powerpc/platforms/pseries/Kconfig"
720 default y if SMP && PPC_PSERIES
725 depends on NEED_MULTIPLE_NODES
727 config ARCH_SELECT_MEMORY_MODEL
731 config ARCH_FLATMEM_ENABLE
733 depends on (PPC64 && !NUMA) || PPC32
735 config ARCH_SPARSEMEM_ENABLE
739 config ARCH_SPARSEMEM_DEFAULT
741 depends on SMP && PPC_PSERIES
745 config HAVE_ARCH_EARLY_PFN_TO_NID
747 depends on NEED_MULTIPLE_NODES
749 config ARCH_MEMORY_PROBE
751 depends on MEMORY_HOTPLUG
753 # Some NUMA nodes have memory ranges that span
754 # other nodes. Even though a pfn is valid and
755 # between a node's start and end pfns, it may not
756 # reside on that node. See memmap_init_zone()
758 config NODES_SPAN_OTHER_NODES
760 depends on NEED_MULTIPLE_NODES
766 This option changes the kernel logical page size to 64k. On machines
767 without processor support for 64k pages, the kernel will simulate
768 them by loading each individual 4k page on demand transparently,
769 while on hardware with such support, it will be used to map
770 normal application pages.
773 bool "SMT (Hyperthreading) scheduler support"
774 depends on PPC64 && SMP
776 SMT scheduler support improves the CPU scheduler's decision making
777 when dealing with POWER5 cpus at a cost of slightly increased
778 overhead in some places. If unsure say N here.
780 config PROC_DEVICETREE
781 bool "Support for device tree in /proc"
784 This option adds a device-tree directory under /proc which contains
785 an image of the device tree that the kernel copies from Open
786 Firmware or other boot firmware. If unsure, say Y here.
788 source "arch/powerpc/platforms/prep/Kconfig"
791 bool "Default bootloader kernel arguments"
792 depends on !PPC_ISERIES
795 string "Initial kernel command string"
796 depends on CMDLINE_BOOL
797 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
799 On some platforms, there is currently no way for the boot loader to
800 pass arguments to the kernel. For these platforms, you can supply
801 some command-line options at build time by entering them here. In
802 most cases you will need to specify the root device here.
805 source kernel/power/Kconfig
809 bool "Enable seccomp to safely compute untrusted bytecode"
813 This kernel feature is useful for number crunching applications
814 that may need to compute untrusted bytecode during their
815 execution. By using pipes or other transports made available to
816 the process as file descriptors supporting the read/write
817 syscalls, it's possible to isolate those applications in
818 their own address space using seccomp. Once seccomp is
819 enabled via /proc/<pid>/seccomp, it cannot be disabled
820 and the task is only allowed to execute a few safe syscalls
821 defined by each seccomp mode.
823 If unsure, say Y. Only embedded should say N here.
834 bool "Support for ISA-bus hardware"
835 depends on PPC_PREP || PPC_CHRP
838 Find out whether you have ISA slots on your motherboard. ISA is the
839 name of a bus system, i.e. the way the CPU talks to the other stuff
840 inside your box. If you have an Apple machine, say N here; if you
841 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
842 you have an embedded board, consult your board documentation.
844 config GENERIC_ISA_DMA
846 depends on PPC64 || POWER4 || 6xx && !CPM2
861 config PPC_INDIRECT_PCI
864 default y if 40x || 44x
876 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
881 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
882 || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) || MPC7448HPC2
883 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
884 && !PPC_85xx && !PPC_86xx
885 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
886 default PCI_QSPAN if !4xx && !CPM2 && 8xx
888 Find out whether your system includes a PCI bus. PCI is the name of
889 a bus system, i.e. the way the CPU talks to the other stuff inside
890 your box. If you say Y here, the kernel will include drivers and
891 infrastructure code to support PCI bus devices.
899 depends on !4xx && !CPM2 && 8xx
902 Say Y here if you have a system based on a Motorola 8xx-series
903 embedded processor with a QSPAN PCI interface, otherwise say N.
907 depends on PCI && 8260
908 select PPC_INDIRECT_PCI
912 bool "Enable workaround for MPC826x erratum PCI 9"
913 depends on PCI_8260 && !ADS8272
917 prompt "IDMA channel for PCI 9 workaround"
920 config 8260_PCI9_IDMA1
923 config 8260_PCI9_IDMA2
926 config 8260_PCI9_IDMA3
929 config 8260_PCI9_IDMA4
934 source "drivers/pci/pcie/Kconfig"
936 source "drivers/pci/Kconfig"
938 source "drivers/pcmcia/Kconfig"
940 source "drivers/pci/hotplug/Kconfig"
944 menu "Advanced setup"
947 config ADVANCED_OPTIONS
948 bool "Prompt for advanced kernel configuration options"
950 This option will enable prompting for a variety of advanced kernel
951 configuration options. These options can cause the kernel to not
952 work if they are set incorrectly, but can be used to optimize certain
953 aspects of kernel memory management.
955 Unless you know what you are doing, say N here.
957 comment "Default settings for advanced configuration options are used"
958 depends on !ADVANCED_OPTIONS
960 config HIGHMEM_START_BOOL
961 bool "Set high memory pool address"
962 depends on ADVANCED_OPTIONS && HIGHMEM
964 This option allows you to set the base address of the kernel virtual
965 area used to map high memory pages. This can be useful in
966 optimizing the layout of kernel virtual memory.
968 Say N here unless you know what you are doing.
971 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
974 config LOWMEM_SIZE_BOOL
975 bool "Set maximum low memory"
976 depends on ADVANCED_OPTIONS
978 This option allows you to set the maximum amount of memory which
979 will be used as "low memory", that is, memory which the kernel can
980 access directly, without having to set up a kernel virtual mapping.
981 This can be useful in optimizing the layout of kernel virtual
984 Say N here unless you know what you are doing.
987 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
990 config KERNEL_START_BOOL
991 bool "Set custom kernel base address"
992 depends on ADVANCED_OPTIONS
994 This option allows you to set the kernel virtual address at which
995 the kernel will map low memory (the kernel image will be linked at
996 this address). This can be useful in optimizing the virtual memory
997 layout of the system.
999 Say N here unless you know what you are doing.
1002 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1003 default "0xc0000000"
1005 config TASK_SIZE_BOOL
1006 bool "Set custom user task size"
1007 depends on ADVANCED_OPTIONS
1009 This option allows you to set the amount of virtual address space
1010 allocated to user tasks. This can be useful in optimizing the
1011 virtual memory layout of the system.
1013 Say N here unless you know what you are doing.
1016 hex "Size of user task space" if TASK_SIZE_BOOL
1017 default "0x80000000"
1019 config CONSISTENT_START_BOOL
1020 bool "Set custom consistent memory pool address"
1021 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1023 This option allows you to set the base virtual address
1024 of the the consistent memory pool. This pool of virtual
1025 memory is used to make consistent memory allocations.
1027 config CONSISTENT_START
1028 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
1029 default "0xff100000" if NOT_COHERENT_CACHE
1031 config CONSISTENT_SIZE_BOOL
1032 bool "Set custom consistent memory pool size"
1033 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1035 This option allows you to set the size of the the
1036 consistent memory pool. This pool of virtual memory
1037 is used to make consistent memory allocations.
1039 config CONSISTENT_SIZE
1040 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1041 default "0x00200000" if NOT_COHERENT_CACHE
1043 config BOOT_LOAD_BOOL
1044 bool "Set the boot link/load address"
1045 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1047 This option allows you to set the initial load address of the zImage
1048 or zImage.initrd file. This can be useful if you are on a board
1049 which has a small amount of memory.
1051 Say N here unless you know what you are doing.
1054 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1055 default "0x00400000" if 40x || 8xx || 8260
1056 default "0x01000000" if 44x
1057 default "0x00800000"
1060 bool "Pinned Kernel TLBs (860 ONLY)"
1061 depends on ADVANCED_OPTIONS && 8xx
1067 default "0xc000000000000000"
1070 source "net/Kconfig"
1072 source "drivers/Kconfig"
1076 # XXX source "arch/ppc/8xx_io/Kconfig"
1078 # XXX source "arch/ppc/8260_io/Kconfig"
1080 source "arch/powerpc/platforms/iseries/Kconfig"
1082 source "lib/Kconfig"
1084 menu "Instrumentation Support"
1085 depends on EXPERIMENTAL
1087 source "arch/powerpc/oprofile/Kconfig"
1090 bool "Kprobes (EXPERIMENTAL)"
1091 depends on PPC64 && EXPERIMENTAL && MODULES
1093 Kprobes allows you to trap at almost any kernel address and
1094 execute a callback function. register_kprobe() establishes
1095 a probepoint and specifies the callback. Kprobes is useful
1096 for kernel debugging, non-intrusive instrumentation and testing.
1097 If in doubt, say "N".
1100 source "arch/powerpc/Kconfig.debug"
1102 source "kernel/vserver/Kconfig"
1104 source "security/Kconfig"
1108 depends on COMPAT && KEYS
1111 source "crypto/Kconfig"