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>
410 config PPC_CELL_NATIVE
415 config PPC_IBM_CELL_BLADE
416 bool " IBM Cell Blade"
417 depends on PPC_MULTIPLATFORM && PPC64
418 select PPC_CELL_NATIVE
421 select PPC_UDBG_16550
422 select UDBG_RTAS_CONSOLE
424 config UDBG_RTAS_CONSOLE
429 depends on PPC_PSERIES
435 depends on PPC_MULTIPLATFORM && PPC64
439 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
447 config RTAS_ERROR_LOGGING
453 bool "Proc interface to RTAS"
458 tristate "Firmware flash interface"
459 depends on PPC64 && RTAS_PROC
465 config MPIC_BROKEN_U3
471 depends on PPC_PSERIES || PPC_ISERIES
476 depends on PPC_PSERIES
477 bool "Support for GX bus based adapters"
479 Bus device driver for GX bus based adapters.
489 source "drivers/cpufreq/Kconfig"
492 bool "Support for Apple PowerBooks"
493 depends on CPU_FREQ && ADB_PMU && PPC32
494 select CPU_FREQ_TABLE
496 This adds support for frequency switching on Apple PowerBooks,
497 this currently includes some models of iBook & Titanium
500 config CPU_FREQ_PMAC64
501 bool "Support for some Apple G5s"
502 depends on CPU_FREQ && PMAC_SMU && PPC64
503 select CPU_FREQ_TABLE
505 This adds support for frequency switching on Apple iMac G5,
506 and some of the more recent desktop G5 machines as well.
508 config PPC601_SYNC_FIX
509 bool "Workarounds for PPC601 bugs"
510 depends on 6xx && (PPC_PREP || PPC_PMAC)
512 Some versions of the PPC601 (the first PowerPC chip) have bugs which
513 mean that extra synchronization instructions are required near
514 certain instructions, typically those that make major changes to the
515 CPU state. These extra instructions reduce performance slightly.
516 If you say N here, these extra instructions will not be included,
517 resulting in a kernel which will run faster but may not run at all
518 on some systems with the PPC601 chip.
520 If in doubt, say Y here.
523 bool "On-chip CPU temperature sensor support"
526 G3 and G4 processors have an on-chip temperature sensor called the
527 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
528 temperature within 2-4 degrees Celsius. This option shows the current
529 on-die temperature in /proc/cpuinfo if the cpu supports it.
531 Unfortunately, on some chip revisions, this sensor is very inaccurate
532 and in many cases, does not work at all, so don't assume the cpu
533 temp is actually what /proc/cpuinfo says it is.
536 bool "Interrupt driven TAU driver (DANGEROUS)"
539 The TAU supports an interrupt driven mode which causes an interrupt
540 whenever the temperature goes out of range. This is the fastest way
541 to get notified the temp has exceeded a range. With this option off,
542 a timer is used to re-check the temperature periodically.
544 However, on some cpus it appears that the TAU interrupt hardware
545 is buggy and can cause a situation which would lead unexplained hard
548 Unless you are extending the TAU driver, or enjoy kernel/hardware
549 debugging, leave this option off.
552 bool "Average high and low temp"
555 The TAU hardware can compare the temperature to an upper and lower
556 bound. The default behavior is to show both the upper and lower
557 bound in /proc/cpuinfo. If the range is large, the temperature is
558 either changing a lot, or the TAU hardware is broken (likely on some
559 G4's). If the range is small (around 4 degrees), the temperature is
560 relatively stable. If you say Y here, a single temperature value,
561 halfway between the upper and lower bounds, will be reported in
564 If in doubt, say N here.
567 source arch/powerpc/platforms/embedded6xx/Kconfig
568 source arch/powerpc/platforms/4xx/Kconfig
569 source arch/powerpc/platforms/83xx/Kconfig
570 source arch/powerpc/platforms/85xx/Kconfig
571 source arch/powerpc/platforms/86xx/Kconfig
572 source arch/powerpc/platforms/8xx/Kconfig
573 source arch/powerpc/platforms/cell/Kconfig
575 menu "Kernel options"
578 bool "High memory support"
581 source kernel/Kconfig.hz
582 source kernel/Kconfig.preempt
583 source "fs/Kconfig.binfmt"
585 # We optimistically allocate largepages from the VM, so make the limit
586 # large enough (16MB). This badly named config option is actually
588 config FORCE_MAX_ZONEORDER
591 default "9" if PPC_64K_PAGES
594 config MATH_EMULATION
595 bool "Math emulation"
596 depends on 4xx || 8xx || E200 || E500
598 Some PowerPC chips designed for embedded applications do not have
599 a floating-point unit and therefore do not implement the
600 floating-point instructions in the PowerPC instruction set. If you
601 say Y here, the kernel will include code to emulate a floating-point
602 unit, which will allow programs that use floating-point
606 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
607 depends on EXPERIMENTAL && PPC64
610 Cause IO segments sent to a device for DMA to be merged virtually
611 by the IOMMU when they happen to have been allocated contiguously.
612 This doesn't add pressure to the IOMMU allocator. However, some
613 drivers don't support getting large merged segments coming back
614 from *_map_sg(). Say Y if you know the drivers you are using are
615 properly handling this case.
618 bool "Support for enabling/disabling CPUs"
619 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
621 Say Y here to be able to disable and re-enable individual
622 CPUs at runtime on SMP machines.
624 Say N if you are unsure.
627 bool "kexec system call (EXPERIMENTAL)"
628 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
630 kexec is a system call that implements the ability to shutdown your
631 current kernel, and to start another kernel. It is like a reboot
632 but it is indepedent of the system firmware. And like a reboot
633 you can start any kernel with it, not just Linux.
635 The name comes from the similiarity to the exec system call.
637 It is an ongoing process to be certain the hardware in a machine
638 is properly shutdown, so do not be surprised if this code does not
639 initially work for you. It may help to enable device hotplugging
640 support. As of this writing the exact hardware interface is
641 strongly in flux, so no good recommendation can be made.
644 bool "Build a kdump crash kernel (EXPERIMENTAL)"
645 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
647 Build a kernel suitable for use as a kdump capture kernel.
648 The kernel will be linked at a different address than normal, and
649 so can only be used for Kdump.
651 Don't change this unless you know what you are doing.
655 depends on 8xx || 8260
659 bool "PC PS/2 style Keyboard"
660 depends on 4xx || CPM2
663 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
664 default y if PPC_PREP
667 bool "Distribute interrupts on all CPUs by default"
668 depends on SMP && !MV64360
670 This option gives the kernel permission to distribute IRQs across
671 multiple CPUs. Saying N here will route all IRQs to the first
672 CPU. Generally saying Y is safe, although some problems have been
673 reported with SMP Power Macintoshes with this option enabled.
675 source "arch/powerpc/platforms/pseries/Kconfig"
680 default y if SMP && PPC_PSERIES
685 depends on NEED_MULTIPLE_NODES
687 config ARCH_SELECT_MEMORY_MODEL
691 config ARCH_FLATMEM_ENABLE
693 depends on (PPC64 && !NUMA) || PPC32
695 config ARCH_SPARSEMEM_ENABLE
699 config ARCH_SPARSEMEM_DEFAULT
701 depends on SMP && PPC_PSERIES
705 config HAVE_ARCH_EARLY_PFN_TO_NID
707 depends on NEED_MULTIPLE_NODES
709 config ARCH_MEMORY_PROBE
711 depends on MEMORY_HOTPLUG
717 This option changes the kernel logical page size to 64k. On machines
718 without processor support for 64k pages, the kernel will simulate
719 them by loading each individual 4k page on demand transparently,
720 while on hardware with such support, it will be used to map
721 normal application pages.
724 bool "SMT (Hyperthreading) scheduler support"
725 depends on PPC64 && SMP
727 SMT scheduler support improves the CPU scheduler's decision making
728 when dealing with POWER5 cpus at a cost of slightly increased
729 overhead in some places. If unsure say N here.
731 config PROC_DEVICETREE
732 bool "Support for device tree in /proc"
735 This option adds a device-tree directory under /proc which contains
736 an image of the device tree that the kernel copies from Open
737 Firmware or other boot firmware. If unsure, say Y here.
739 source "arch/powerpc/platforms/prep/Kconfig"
742 bool "Default bootloader kernel arguments"
743 depends on !PPC_ISERIES
746 string "Initial kernel command string"
747 depends on CMDLINE_BOOL
748 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
750 On some platforms, there is currently no way for the boot loader to
751 pass arguments to the kernel. For these platforms, you can supply
752 some command-line options at build time by entering them here. In
753 most cases you will need to specify the root device here.
756 source kernel/power/Kconfig
760 bool "Enable seccomp to safely compute untrusted bytecode"
764 This kernel feature is useful for number crunching applications
765 that may need to compute untrusted bytecode during their
766 execution. By using pipes or other transports made available to
767 the process as file descriptors supporting the read/write
768 syscalls, it's possible to isolate those applications in
769 their own address space using seccomp. Once seccomp is
770 enabled via /proc/<pid>/seccomp, it cannot be disabled
771 and the task is only allowed to execute a few safe syscalls
772 defined by each seccomp mode.
774 If unsure, say Y. Only embedded should say N here.
785 bool "Support for ISA-bus hardware"
786 depends on PPC_PREP || PPC_CHRP
789 Find out whether you have ISA slots on your motherboard. ISA is the
790 name of a bus system, i.e. the way the CPU talks to the other stuff
791 inside your box. If you have an Apple machine, say N here; if you
792 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
793 you have an embedded board, consult your board documentation.
795 config GENERIC_ISA_DMA
797 depends on PPC64 || POWER4 || 6xx && !CPM2
804 config PPC_INDIRECT_PCI
807 default y if 40x || 44x
819 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
824 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
825 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
826 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
827 default PCI_QSPAN if !4xx && !CPM2 && 8xx
829 Find out whether your system includes a PCI bus. PCI is the name of
830 a bus system, i.e. the way the CPU talks to the other stuff inside
831 your box. If you say Y here, the kernel will include drivers and
832 infrastructure code to support PCI bus devices.
840 depends on !4xx && !CPM2 && 8xx
843 Say Y here if you have a system based on a Motorola 8xx-series
844 embedded processor with a QSPAN PCI interface, otherwise say N.
848 depends on PCI && 8260
849 select PPC_INDIRECT_PCI
853 bool "Enable workaround for MPC826x erratum PCI 9"
854 depends on PCI_8260 && !ADS8272
858 prompt "IDMA channel for PCI 9 workaround"
861 config 8260_PCI9_IDMA1
864 config 8260_PCI9_IDMA2
867 config 8260_PCI9_IDMA3
870 config 8260_PCI9_IDMA4
875 source "drivers/pci/pcie/Kconfig"
877 source "drivers/pci/Kconfig"
879 source "drivers/pcmcia/Kconfig"
881 source "drivers/pci/hotplug/Kconfig"
885 menu "Advanced setup"
888 config ADVANCED_OPTIONS
889 bool "Prompt for advanced kernel configuration options"
891 This option will enable prompting for a variety of advanced kernel
892 configuration options. These options can cause the kernel to not
893 work if they are set incorrectly, but can be used to optimize certain
894 aspects of kernel memory management.
896 Unless you know what you are doing, say N here.
898 comment "Default settings for advanced configuration options are used"
899 depends on !ADVANCED_OPTIONS
901 config HIGHMEM_START_BOOL
902 bool "Set high memory pool address"
903 depends on ADVANCED_OPTIONS && HIGHMEM
905 This option allows you to set the base address of the kernel virtual
906 area used to map high memory pages. This can be useful in
907 optimizing the layout of kernel virtual memory.
909 Say N here unless you know what you are doing.
912 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
915 config LOWMEM_SIZE_BOOL
916 bool "Set maximum low memory"
917 depends on ADVANCED_OPTIONS
919 This option allows you to set the maximum amount of memory which
920 will be used as "low memory", that is, memory which the kernel can
921 access directly, without having to set up a kernel virtual mapping.
922 This can be useful in optimizing the layout of kernel virtual
925 Say N here unless you know what you are doing.
928 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
931 config KERNEL_START_BOOL
932 bool "Set custom kernel base address"
933 depends on ADVANCED_OPTIONS
935 This option allows you to set the kernel virtual address at which
936 the kernel will map low memory (the kernel image will be linked at
937 this address). This can be useful in optimizing the virtual memory
938 layout of the system.
940 Say N here unless you know what you are doing.
943 hex "Virtual address of kernel base" if KERNEL_START_BOOL
946 config TASK_SIZE_BOOL
947 bool "Set custom user task size"
948 depends on ADVANCED_OPTIONS
950 This option allows you to set the amount of virtual address space
951 allocated to user tasks. This can be useful in optimizing the
952 virtual memory layout of the system.
954 Say N here unless you know what you are doing.
957 hex "Size of user task space" if TASK_SIZE_BOOL
960 config CONSISTENT_START_BOOL
961 bool "Set custom consistent memory pool address"
962 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
964 This option allows you to set the base virtual address
965 of the the consistent memory pool. This pool of virtual
966 memory is used to make consistent memory allocations.
968 config CONSISTENT_START
969 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
970 default "0xff100000" if NOT_COHERENT_CACHE
972 config CONSISTENT_SIZE_BOOL
973 bool "Set custom consistent memory pool size"
974 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
976 This option allows you to set the size of the the
977 consistent memory pool. This pool of virtual memory
978 is used to make consistent memory allocations.
980 config CONSISTENT_SIZE
981 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
982 default "0x00200000" if NOT_COHERENT_CACHE
984 config BOOT_LOAD_BOOL
985 bool "Set the boot link/load address"
986 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
988 This option allows you to set the initial load address of the zImage
989 or zImage.initrd file. This can be useful if you are on a board
990 which has a small amount of memory.
992 Say N here unless you know what you are doing.
995 hex "Link/load address for booting" if BOOT_LOAD_BOOL
996 default "0x00400000" if 40x || 8xx || 8260
997 default "0x01000000" if 44x
1001 bool "Pinned Kernel TLBs (860 ONLY)"
1002 depends on ADVANCED_OPTIONS && 8xx
1008 default "0xc000000000000000"
1011 source "net/Kconfig"
1013 source "drivers/Kconfig"
1017 # XXX source "arch/ppc/8xx_io/Kconfig"
1019 # XXX source "arch/ppc/8260_io/Kconfig"
1021 source "arch/powerpc/platforms/iseries/Kconfig"
1023 source "lib/Kconfig"
1025 menu "Instrumentation Support"
1026 depends on EXPERIMENTAL
1028 source "arch/powerpc/oprofile/Kconfig"
1031 bool "Kprobes (EXPERIMENTAL)"
1032 depends on PPC64 && EXPERIMENTAL && MODULES
1034 Kprobes allows you to trap at almost any kernel address and
1035 execute a callback function. register_kprobe() establishes
1036 a probepoint and specifies the callback. Kprobes is useful
1037 for kernel debugging, non-intrusive instrumentation and testing.
1038 If in doubt, say "N".
1041 source "arch/powerpc/Kconfig.debug"
1043 source "security/Kconfig"
1047 depends on COMPAT && KEYS
1050 source "crypto/Kconfig"