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
33 config RWSEM_GENERIC_SPINLOCK
36 config RWSEM_XCHGADD_ALGORITHM
40 config GENERIC_HWEIGHT
44 config GENERIC_CALIBRATE_DELAY
48 config GENERIC_FIND_NEXT_BIT
66 depends on COMPAT && SYSVIPC
69 # All PPC32s use generic nvram driver through ppc_md
74 config SCHED_NO_NO_OMIT_FRAME_POINTER
78 config ARCH_MAY_HAVE_PC_FDC
91 default y if PPC32 && SMP
97 Used to allow a board to specify it wants a uImage built by default
100 menu "Processor support"
102 prompt "Processor Type"
111 There are four families of PowerPC chips supported. The more common
112 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
113 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
114 embedded versions (403 and 405) and the high end 64 bit Power
115 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
117 Unless you are building a kernel for one of the embedded processor
118 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
119 Note that the kernel runs in 32-bit mode even on 64-bit chips.
122 bool "Freescale 52xx"
127 bool "Freescale 82xx"
132 bool "Freescale 83xx"
139 bool "Freescale 85xx"
145 bool "Freescale 86xx"
151 The Freescale E600 SoCs have 74xx cores.
163 bool "Freescale e200"
168 bool "Optimize for POWER4"
172 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
173 The resulting binary will not work on POWER3 or RS64 processors
174 when compiled with binutils 2.15 or later.
179 default y if !POWER4_ONLY
188 # this is temp to handle compat with arch=ppc
192 # this is temp to handle compat with arch=ppc
205 depends on E200 || E500
210 depends on E200 || E500
215 depends on 44x || E500
217 default y if E500 && PHYS_64BIT
220 bool 'Large physical address support' if E500
221 depends on 44x || E500
224 This option enables kernel support for larger than 32-bit physical
225 addresses. This features is not be available on all e500 cores.
227 If in doubt, say N here.
230 bool "AltiVec Support"
231 depends on CLASSIC32 || POWER4
233 This option enables kernel support for the Altivec extensions to the
234 PowerPC processor. The kernel currently supports saving and restoring
235 altivec registers, and turning on the 'altivec enable' bit so user
236 processes can execute altivec instructions.
238 This option is only usefully if you have a processor that supports
239 altivec (G4, otherwise known as 74xx series), but does not have
240 any affect on a non-altivec cpu (it does, however add code to the
243 If in doubt, say Y here.
247 depends on E200 || E500
250 This option enables kernel support for the Signal Processing
251 Extensions (SPE) to the PowerPC processor. The kernel currently
252 supports saving and restoring SPE registers, and turning on the
253 'spe enable' bit so user processes can execute SPE instructions.
255 This option is only useful if you have a processor that supports
256 SPE (e500, otherwise known as 85xx series), but does not have any
257 effect on a non-spe cpu (it does, however add code to the kernel).
259 If in doubt, say Y here.
263 depends on 6xx || POWER3 || POWER4 || PPC64
266 config PPC_STD_MMU_32
268 depends on PPC_STD_MMU && PPC32
270 config VIRT_CPU_ACCOUNTING
271 bool "Deterministic task and CPU time accounting"
275 Select this option to enable more accurate task and CPU time
276 accounting. This is done by reading a CPU counter on each
277 kernel entry and exit and on transitions within the kernel
278 between system, softirq and hardirq state, so there is a
279 small performance impact. This also enables accounting of
280 stolen time on logically-partitioned systems running on
281 IBM POWER5-based machines.
283 If in doubt, say Y here.
286 depends on PPC_STD_MMU
287 bool "Symmetric multi-processing support"
289 This enables support for systems with more than one CPU. If you have
290 a system with only one CPU, say N. If you have a system with more
291 than one CPU, say Y. Note that the kernel does not currently
292 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
293 since they have inadequate hardware support for multiprocessor
296 If you say N here, the kernel will run on single and multiprocessor
297 machines, but will use only one CPU of a multiprocessor machine. If
298 you say Y here, the kernel will run on single-processor machines.
299 On a single-processor machine, the kernel will run faster if you say
302 If you don't know what to do here, say N.
305 int "Maximum number of CPUs (2-128)"
308 default "32" if PPC64
311 config NOT_COHERENT_CACHE
313 depends on 4xx || 8xx || E200
317 source "init/Kconfig"
319 menu "Platform support"
320 depends on PPC64 || CLASSIC32
323 prompt "Machine type"
324 default PPC_MULTIPLATFORM
326 config PPC_MULTIPLATFORM
327 bool "Generic desktop/server/laptop"
329 Select this option if configuring for an IBM pSeries or
330 RS/6000 machine, an Apple machine, or a PReP, CHRP,
331 Maple or Cell-based machine.
334 bool "IBM Legacy iSeries"
338 bool "Embedded 6xx/7xx/7xxx-based board"
339 depends on PPC32 && BROKEN
343 depends on PPC32 && BROKEN
345 Select APUS if configuring for a PowerUP Amiga.
346 More information is available at:
347 <http://linux-apus.sourceforge.net/>.
351 depends on PPC_MULTIPLATFORM && PPC64
352 bool "IBM pSeries & new (POWER5-based) iSeries"
355 select RTAS_ERROR_LOGGING
356 select PPC_UDBG_16550
360 bool "Common Hardware Reference Platform (CHRP) based machines"
361 depends on PPC_MULTIPLATFORM && PPC32
363 select PPC_INDIRECT_PCI
366 select PPC_UDBG_16550
370 bool "Apple PowerMac based machines"
371 depends on PPC_MULTIPLATFORM
372 select PPC_INDIRECT_PCI if PPC32
373 select PPC_MPC106 if PPC32
378 depends on PPC_PMAC && POWER4
380 select MPIC_BROKEN_U3
381 select GENERIC_TBSYNC
386 bool "PowerPC Reference Platform (PReP) based machines"
387 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
389 select PPC_INDIRECT_PCI
390 select PPC_UDBG_16550
394 depends on PPC_MULTIPLATFORM && PPC64
395 bool "Maple 970FX Evaluation Board"
397 select MPIC_BROKEN_U3
398 select GENERIC_TBSYNC
399 select PPC_UDBG_16550
403 This option enables support for the Maple 970FX Evaluation Board.
404 For more informations, refer to <http://www.970eval.com>
407 bool "Cell Broadband Processor Architecture"
408 depends on PPC_MULTIPLATFORM && PPC64
411 select PPC_UDBG_16550
414 depends on PPC_PSERIES
420 depends on PPC_MULTIPLATFORM && PPC64
424 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
432 config RTAS_ERROR_LOGGING
438 bool "Proc interface to RTAS"
443 tristate "Firmware flash interface"
444 depends on PPC64 && RTAS_PROC
450 config MPIC_BROKEN_U3
461 depends on PPC_PSERIES || PPC_ISERIES
466 depends on PPC_PSERIES
467 bool "Support for GX bus based adapters"
469 Bus device driver for GX bus based adapters.
479 source "drivers/cpufreq/Kconfig"
482 bool "Support for Apple PowerBooks"
483 depends on CPU_FREQ && ADB_PMU && PPC32
484 select CPU_FREQ_TABLE
486 This adds support for frequency switching on Apple PowerBooks,
487 this currently includes some models of iBook & Titanium
490 config CPU_FREQ_PMAC64
491 bool "Support for some Apple G5s"
492 depends on CPU_FREQ && PMAC_SMU && PPC64
493 select CPU_FREQ_TABLE
495 This adds support for frequency switching on Apple iMac G5,
496 and some of the more recent desktop G5 machines as well.
498 config PPC601_SYNC_FIX
499 bool "Workarounds for PPC601 bugs"
500 depends on 6xx && (PPC_PREP || PPC_PMAC)
502 Some versions of the PPC601 (the first PowerPC chip) have bugs which
503 mean that extra synchronization instructions are required near
504 certain instructions, typically those that make major changes to the
505 CPU state. These extra instructions reduce performance slightly.
506 If you say N here, these extra instructions will not be included,
507 resulting in a kernel which will run faster but may not run at all
508 on some systems with the PPC601 chip.
510 If in doubt, say Y here.
513 bool "On-chip CPU temperature sensor support"
516 G3 and G4 processors have an on-chip temperature sensor called the
517 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
518 temperature within 2-4 degrees Celsius. This option shows the current
519 on-die temperature in /proc/cpuinfo if the cpu supports it.
521 Unfortunately, on some chip revisions, this sensor is very inaccurate
522 and in many cases, does not work at all, so don't assume the cpu
523 temp is actually what /proc/cpuinfo says it is.
526 bool "Interrupt driven TAU driver (DANGEROUS)"
529 The TAU supports an interrupt driven mode which causes an interrupt
530 whenever the temperature goes out of range. This is the fastest way
531 to get notified the temp has exceeded a range. With this option off,
532 a timer is used to re-check the temperature periodically.
534 However, on some cpus it appears that the TAU interrupt hardware
535 is buggy and can cause a situation which would lead unexplained hard
538 Unless you are extending the TAU driver, or enjoy kernel/hardware
539 debugging, leave this option off.
542 bool "Average high and low temp"
545 The TAU hardware can compare the temperature to an upper and lower
546 bound. The default behavior is to show both the upper and lower
547 bound in /proc/cpuinfo. If the range is large, the temperature is
548 either changing a lot, or the TAU hardware is broken (likely on some
549 G4's). If the range is small (around 4 degrees), the temperature is
550 relatively stable. If you say Y here, a single temperature value,
551 halfway between the upper and lower bounds, will be reported in
554 If in doubt, say N here.
557 source arch/powerpc/platforms/embedded6xx/Kconfig
558 source arch/powerpc/platforms/4xx/Kconfig
559 source arch/powerpc/platforms/83xx/Kconfig
560 source arch/powerpc/platforms/85xx/Kconfig
561 source arch/powerpc/platforms/86xx/Kconfig
562 source arch/powerpc/platforms/8xx/Kconfig
563 source arch/powerpc/platforms/cell/Kconfig
565 menu "Kernel options"
568 bool "High memory support"
571 source kernel/Kconfig.hz
572 source kernel/Kconfig.preempt
573 source "fs/Kconfig.binfmt"
575 # We optimistically allocate largepages from the VM, so make the limit
576 # large enough (16MB). This badly named config option is actually
578 config FORCE_MAX_ZONEORDER
581 default "9" if PPC_64K_PAGES
584 config MATH_EMULATION
585 bool "Math emulation"
586 depends on 4xx || 8xx || E200 || E500
588 Some PowerPC chips designed for embedded applications do not have
589 a floating-point unit and therefore do not implement the
590 floating-point instructions in the PowerPC instruction set. If you
591 say Y here, the kernel will include code to emulate a floating-point
592 unit, which will allow programs that use floating-point
596 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
597 depends on EXPERIMENTAL && PPC64
600 Cause IO segments sent to a device for DMA to be merged virtually
601 by the IOMMU when they happen to have been allocated contiguously.
602 This doesn't add pressure to the IOMMU allocator. However, some
603 drivers don't support getting large merged segments coming back
604 from *_map_sg(). Say Y if you know the drivers you are using are
605 properly handling this case.
608 bool "Support for enabling/disabling CPUs"
609 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
611 Say Y here to be able to disable and re-enable individual
612 CPUs at runtime on SMP machines.
614 Say N if you are unsure.
617 bool "kexec system call (EXPERIMENTAL)"
618 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
620 kexec is a system call that implements the ability to shutdown your
621 current kernel, and to start another kernel. It is like a reboot
622 but it is indepedent of the system firmware. And like a reboot
623 you can start any kernel with it, not just Linux.
625 The name comes from the similiarity to the exec system call.
627 It is an ongoing process to be certain the hardware in a machine
628 is properly shutdown, so do not be surprised if this code does not
629 initially work for you. It may help to enable device hotplugging
630 support. As of this writing the exact hardware interface is
631 strongly in flux, so no good recommendation can be made.
634 bool "Build a kdump crash kernel (EXPERIMENTAL)"
635 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
637 Build a kernel suitable for use as a kdump capture kernel.
638 The kernel will be linked at a different address than normal, and
639 so can only be used for Kdump.
641 Don't change this unless you know what you are doing.
645 depends on 8xx || 8260
649 bool "PC PS/2 style Keyboard"
650 depends on 4xx || CPM2
653 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
654 default y if PPC_PREP
657 bool "Distribute interrupts on all CPUs by default"
658 depends on SMP && !MV64360
660 This option gives the kernel permission to distribute IRQs across
661 multiple CPUs. Saying N here will route all IRQs to the first
662 CPU. Generally saying Y is safe, although some problems have been
663 reported with SMP Power Macintoshes with this option enabled.
665 source "arch/powerpc/platforms/pseries/Kconfig"
670 default y if SMP && PPC_PSERIES
675 depends on NEED_MULTIPLE_NODES
677 config ARCH_SELECT_MEMORY_MODEL
681 config ARCH_FLATMEM_ENABLE
683 depends on (PPC64 && !NUMA) || PPC32
685 config ARCH_SPARSEMEM_ENABLE
689 config ARCH_SPARSEMEM_DEFAULT
691 depends on SMP && PPC_PSERIES
695 config HAVE_ARCH_EARLY_PFN_TO_NID
697 depends on NEED_MULTIPLE_NODES
699 config ARCH_MEMORY_PROBE
701 depends on MEMORY_HOTPLUG
707 This option changes the kernel logical page size to 64k. On machines
708 without processor support for 64k pages, the kernel will simulate
709 them by loading each individual 4k page on demand transparently,
710 while on hardware with such support, it will be used to map
711 normal application pages.
714 bool "SMT (Hyperthreading) scheduler support"
715 depends on PPC64 && SMP
718 SMT scheduler support improves the CPU scheduler's decision making
719 when dealing with POWER5 cpus at a cost of slightly increased
720 overhead in some places. If unsure say N here.
722 config PROC_DEVICETREE
723 bool "Support for device tree in /proc"
726 This option adds a device-tree directory under /proc which contains
727 an image of the device tree that the kernel copies from Open
728 Firmware or other boot firmware. If unsure, say Y here.
730 source "arch/powerpc/platforms/prep/Kconfig"
733 bool "Default bootloader kernel arguments"
734 depends on !PPC_ISERIES
737 string "Initial kernel command string"
738 depends on CMDLINE_BOOL
739 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
741 On some platforms, there is currently no way for the boot loader to
742 pass arguments to the kernel. For these platforms, you can supply
743 some command-line options at build time by entering them here. In
744 most cases you will need to specify the root device here.
747 source kernel/power/Kconfig
751 bool "Enable seccomp to safely compute untrusted bytecode"
755 This kernel feature is useful for number crunching applications
756 that may need to compute untrusted bytecode during their
757 execution. By using pipes or other transports made available to
758 the process as file descriptors supporting the read/write
759 syscalls, it's possible to isolate those applications in
760 their own address space using seccomp. Once seccomp is
761 enabled via /proc/<pid>/seccomp, it cannot be disabled
762 and the task is only allowed to execute a few safe syscalls
763 defined by each seccomp mode.
765 If unsure, say Y. Only embedded should say N here.
776 bool "Support for ISA-bus hardware"
777 depends on PPC_PREP || PPC_CHRP
780 Find out whether you have ISA slots on your motherboard. ISA is the
781 name of a bus system, i.e. the way the CPU talks to the other stuff
782 inside your box. If you have an Apple machine, say N here; if you
783 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
784 you have an embedded board, consult your board documentation.
786 config GENERIC_ISA_DMA
788 depends on PPC64 || POWER4 || 6xx && !CPM2
793 default y if MPC8641_HPCN
796 config PPC_INDIRECT_PCI
799 default y if 40x || 44x
811 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
816 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
817 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
818 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
819 default PCI_QSPAN if !4xx && !CPM2 && 8xx
821 Find out whether your system includes a PCI bus. PCI is the name of
822 a bus system, i.e. the way the CPU talks to the other stuff inside
823 your box. If you say Y here, the kernel will include drivers and
824 infrastructure code to support PCI bus devices.
832 depends on !4xx && !CPM2 && 8xx
835 Say Y here if you have a system based on a Motorola 8xx-series
836 embedded processor with a QSPAN PCI interface, otherwise say N.
840 depends on PCI && 8260
841 select PPC_INDIRECT_PCI
845 bool "Enable workaround for MPC826x erratum PCI 9"
846 depends on PCI_8260 && !ADS8272
850 prompt "IDMA channel for PCI 9 workaround"
853 config 8260_PCI9_IDMA1
856 config 8260_PCI9_IDMA2
859 config 8260_PCI9_IDMA3
862 config 8260_PCI9_IDMA4
867 source "drivers/pci/pcie/Kconfig"
869 source "drivers/pci/Kconfig"
871 source "drivers/pcmcia/Kconfig"
873 source "drivers/pci/hotplug/Kconfig"
877 menu "Advanced setup"
880 config ADVANCED_OPTIONS
881 bool "Prompt for advanced kernel configuration options"
883 This option will enable prompting for a variety of advanced kernel
884 configuration options. These options can cause the kernel to not
885 work if they are set incorrectly, but can be used to optimize certain
886 aspects of kernel memory management.
888 Unless you know what you are doing, say N here.
890 comment "Default settings for advanced configuration options are used"
891 depends on !ADVANCED_OPTIONS
893 config HIGHMEM_START_BOOL
894 bool "Set high memory pool address"
895 depends on ADVANCED_OPTIONS && HIGHMEM
897 This option allows you to set the base address of the kernel virtual
898 area used to map high memory pages. This can be useful in
899 optimizing the layout of kernel virtual memory.
901 Say N here unless you know what you are doing.
904 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
907 config LOWMEM_SIZE_BOOL
908 bool "Set maximum low memory"
909 depends on ADVANCED_OPTIONS
911 This option allows you to set the maximum amount of memory which
912 will be used as "low memory", that is, memory which the kernel can
913 access directly, without having to set up a kernel virtual mapping.
914 This can be useful in optimizing the layout of kernel virtual
917 Say N here unless you know what you are doing.
920 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
923 config KERNEL_START_BOOL
924 bool "Set custom kernel base address"
925 depends on ADVANCED_OPTIONS
927 This option allows you to set the kernel virtual address at which
928 the kernel will map low memory (the kernel image will be linked at
929 this address). This can be useful in optimizing the virtual memory
930 layout of the system.
932 Say N here unless you know what you are doing.
935 hex "Virtual address of kernel base" if KERNEL_START_BOOL
938 config TASK_SIZE_BOOL
939 bool "Set custom user task size"
940 depends on ADVANCED_OPTIONS
942 This option allows you to set the amount of virtual address space
943 allocated to user tasks. This can be useful in optimizing the
944 virtual memory layout of the system.
946 Say N here unless you know what you are doing.
949 hex "Size of user task space" if TASK_SIZE_BOOL
952 config CONSISTENT_START_BOOL
953 bool "Set custom consistent memory pool address"
954 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
956 This option allows you to set the base virtual address
957 of the the consistent memory pool. This pool of virtual
958 memory is used to make consistent memory allocations.
960 config CONSISTENT_START
961 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
962 default "0xff100000" if NOT_COHERENT_CACHE
964 config CONSISTENT_SIZE_BOOL
965 bool "Set custom consistent memory pool size"
966 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
968 This option allows you to set the size of the the
969 consistent memory pool. This pool of virtual memory
970 is used to make consistent memory allocations.
972 config CONSISTENT_SIZE
973 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
974 default "0x00200000" if NOT_COHERENT_CACHE
976 config BOOT_LOAD_BOOL
977 bool "Set the boot link/load address"
978 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
980 This option allows you to set the initial load address of the zImage
981 or zImage.initrd file. This can be useful if you are on a board
982 which has a small amount of memory.
984 Say N here unless you know what you are doing.
987 hex "Link/load address for booting" if BOOT_LOAD_BOOL
988 default "0x00400000" if 40x || 8xx || 8260
989 default "0x01000000" if 44x
993 bool "Pinned Kernel TLBs (860 ONLY)"
994 depends on ADVANCED_OPTIONS && 8xx
1000 default "0xc000000000000000"
1003 source "net/Kconfig"
1005 source "drivers/Kconfig"
1009 # XXX source "arch/ppc/8xx_io/Kconfig"
1011 # XXX source "arch/ppc/8260_io/Kconfig"
1013 source "arch/powerpc/platforms/iseries/Kconfig"
1015 source "lib/Kconfig"
1017 menu "Instrumentation Support"
1018 depends on EXPERIMENTAL
1020 source "arch/powerpc/oprofile/Kconfig"
1023 bool "Kprobes (EXPERIMENTAL)"
1024 depends on PPC64 && EXPERIMENTAL && MODULES
1026 Kprobes allows you to trap at almost any kernel address and
1027 execute a callback function. register_kprobe() establishes
1028 a probepoint and specifies the callback. Kprobes is useful
1029 for kernel debugging, non-intrusive instrumentation and testing.
1030 If in doubt, say "N".
1033 source "arch/powerpc/Kconfig.debug"
1035 source "security/Kconfig"
1039 depends on COMPAT && KEYS
1042 source "crypto/Kconfig"