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||BROKEN_ON_SMP)
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 \
448 config RTAS_ERROR_LOGGING
454 bool "Proc interface to RTAS"
459 tristate "Firmware flash interface"
460 depends on PPC64 && RTAS_PROC
466 config MPIC_BROKEN_U3
472 depends on PPC_PSERIES || PPC_ISERIES
477 depends on PPC_PSERIES
478 bool "Support for GX bus based adapters"
480 Bus device driver for GX bus based adapters.
490 source "drivers/cpufreq/Kconfig"
493 bool "Support for Apple PowerBooks"
494 depends on CPU_FREQ && ADB_PMU && PPC32
495 select CPU_FREQ_TABLE
497 This adds support for frequency switching on Apple PowerBooks,
498 this currently includes some models of iBook & Titanium
501 config CPU_FREQ_PMAC64
502 bool "Support for some Apple G5s"
503 depends on CPU_FREQ && PMAC_SMU && PPC64
504 select CPU_FREQ_TABLE
506 This adds support for frequency switching on Apple iMac G5,
507 and some of the more recent desktop G5 machines as well.
509 config PPC601_SYNC_FIX
510 bool "Workarounds for PPC601 bugs"
511 depends on 6xx && (PPC_PREP || PPC_PMAC)
513 Some versions of the PPC601 (the first PowerPC chip) have bugs which
514 mean that extra synchronization instructions are required near
515 certain instructions, typically those that make major changes to the
516 CPU state. These extra instructions reduce performance slightly.
517 If you say N here, these extra instructions will not be included,
518 resulting in a kernel which will run faster but may not run at all
519 on some systems with the PPC601 chip.
521 If in doubt, say Y here.
524 bool "On-chip CPU temperature sensor support"
527 G3 and G4 processors have an on-chip temperature sensor called the
528 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
529 temperature within 2-4 degrees Celsius. This option shows the current
530 on-die temperature in /proc/cpuinfo if the cpu supports it.
532 Unfortunately, on some chip revisions, this sensor is very inaccurate
533 and in many cases, does not work at all, so don't assume the cpu
534 temp is actually what /proc/cpuinfo says it is.
537 bool "Interrupt driven TAU driver (DANGEROUS)"
540 The TAU supports an interrupt driven mode which causes an interrupt
541 whenever the temperature goes out of range. This is the fastest way
542 to get notified the temp has exceeded a range. With this option off,
543 a timer is used to re-check the temperature periodically.
545 However, on some cpus it appears that the TAU interrupt hardware
546 is buggy and can cause a situation which would lead unexplained hard
549 Unless you are extending the TAU driver, or enjoy kernel/hardware
550 debugging, leave this option off.
553 bool "Average high and low temp"
556 The TAU hardware can compare the temperature to an upper and lower
557 bound. The default behavior is to show both the upper and lower
558 bound in /proc/cpuinfo. If the range is large, the temperature is
559 either changing a lot, or the TAU hardware is broken (likely on some
560 G4's). If the range is small (around 4 degrees), the temperature is
561 relatively stable. If you say Y here, a single temperature value,
562 halfway between the upper and lower bounds, will be reported in
565 If in doubt, say N here.
568 depends on EMBEDDED6xx
569 bool "Generic Time-of-day Clock (TODC) support"
571 This adds support for many TODC/RTC chips.
575 source arch/powerpc/platforms/embedded6xx/Kconfig
576 source arch/powerpc/platforms/4xx/Kconfig
577 source arch/powerpc/platforms/83xx/Kconfig
578 source arch/powerpc/platforms/85xx/Kconfig
579 source arch/powerpc/platforms/86xx/Kconfig
580 source arch/powerpc/platforms/8xx/Kconfig
581 source arch/powerpc/platforms/cell/Kconfig
583 menu "Kernel options"
586 bool "High memory support"
589 source kernel/Kconfig.hz
590 source kernel/Kconfig.preempt
591 source "fs/Kconfig.binfmt"
593 # We optimistically allocate largepages from the VM, so make the limit
594 # large enough (16MB). This badly named config option is actually
596 config FORCE_MAX_ZONEORDER
599 default "9" if PPC_64K_PAGES
602 config MATH_EMULATION
603 bool "Math emulation"
604 depends on 4xx || 8xx || E200 || E500
606 Some PowerPC chips designed for embedded applications do not have
607 a floating-point unit and therefore do not implement the
608 floating-point instructions in the PowerPC instruction set. If you
609 say Y here, the kernel will include code to emulate a floating-point
610 unit, which will allow programs that use floating-point
614 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
615 depends on EXPERIMENTAL && PPC64
618 Cause IO segments sent to a device for DMA to be merged virtually
619 by the IOMMU when they happen to have been allocated contiguously.
620 This doesn't add pressure to the IOMMU allocator. However, some
621 drivers don't support getting large merged segments coming back
622 from *_map_sg(). Say Y if you know the drivers you are using are
623 properly handling this case.
626 bool "Support for enabling/disabling CPUs"
627 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
629 Say Y here to be able to disable and re-enable individual
630 CPUs at runtime on SMP machines.
632 Say N if you are unsure.
635 bool "kexec system call (EXPERIMENTAL)"
636 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
638 kexec is a system call that implements the ability to shutdown your
639 current kernel, and to start another kernel. It is like a reboot
640 but it is indepedent of the system firmware. And like a reboot
641 you can start any kernel with it, not just Linux.
643 The name comes from the similiarity to the exec system call.
645 It is an ongoing process to be certain the hardware in a machine
646 is properly shutdown, so do not be surprised if this code does not
647 initially work for you. It may help to enable device hotplugging
648 support. As of this writing the exact hardware interface is
649 strongly in flux, so no good recommendation can be made.
652 bool "Build a kdump crash kernel (EXPERIMENTAL)"
653 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
655 Build a kernel suitable for use as a kdump capture kernel.
656 The kernel will be linked at a different address than normal, and
657 so can only be used for Kdump.
659 Don't change this unless you know what you are doing.
663 depends on 8xx || 8260
667 bool "PC PS/2 style Keyboard"
668 depends on 4xx || CPM2
671 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
672 default y if PPC_PREP
675 bool "Distribute interrupts on all CPUs by default"
676 depends on SMP && !MV64360
678 This option gives the kernel permission to distribute IRQs across
679 multiple CPUs. Saying N here will route all IRQs to the first
680 CPU. Generally saying Y is safe, although some problems have been
681 reported with SMP Power Macintoshes with this option enabled.
683 source "arch/powerpc/platforms/pseries/Kconfig"
688 default y if SMP && PPC_PSERIES
693 depends on NEED_MULTIPLE_NODES
695 config ARCH_SELECT_MEMORY_MODEL
699 config ARCH_FLATMEM_ENABLE
701 depends on (PPC64 && !NUMA) || PPC32
703 config ARCH_SPARSEMEM_ENABLE
707 config ARCH_SPARSEMEM_DEFAULT
709 depends on SMP && PPC_PSERIES
713 config HAVE_ARCH_EARLY_PFN_TO_NID
715 depends on NEED_MULTIPLE_NODES
717 config ARCH_MEMORY_PROBE
719 depends on MEMORY_HOTPLUG
725 This option changes the kernel logical page size to 64k. On machines
726 without processor support for 64k pages, the kernel will simulate
727 them by loading each individual 4k page on demand transparently,
728 while on hardware with such support, it will be used to map
729 normal application pages.
732 bool "SMT (Hyperthreading) scheduler support"
733 depends on PPC64 && SMP
735 SMT scheduler support improves the CPU scheduler's decision making
736 when dealing with POWER5 cpus at a cost of slightly increased
737 overhead in some places. If unsure say N here.
739 config PROC_DEVICETREE
740 bool "Support for device tree in /proc"
743 This option adds a device-tree directory under /proc which contains
744 an image of the device tree that the kernel copies from Open
745 Firmware or other boot firmware. If unsure, say Y here.
747 source "arch/powerpc/platforms/prep/Kconfig"
750 bool "Default bootloader kernel arguments"
751 depends on !PPC_ISERIES
754 string "Initial kernel command string"
755 depends on CMDLINE_BOOL
756 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
758 On some platforms, there is currently no way for the boot loader to
759 pass arguments to the kernel. For these platforms, you can supply
760 some command-line options at build time by entering them here. In
761 most cases you will need to specify the root device here.
764 source kernel/power/Kconfig
768 bool "Enable seccomp to safely compute untrusted bytecode"
772 This kernel feature is useful for number crunching applications
773 that may need to compute untrusted bytecode during their
774 execution. By using pipes or other transports made available to
775 the process as file descriptors supporting the read/write
776 syscalls, it's possible to isolate those applications in
777 their own address space using seccomp. Once seccomp is
778 enabled via /proc/<pid>/seccomp, it cannot be disabled
779 and the task is only allowed to execute a few safe syscalls
780 defined by each seccomp mode.
782 If unsure, say Y. Only embedded should say N here.
793 bool "Support for ISA-bus hardware"
794 depends on PPC_PREP || PPC_CHRP
797 Find out whether you have ISA slots on your motherboard. ISA is the
798 name of a bus system, i.e. the way the CPU talks to the other stuff
799 inside your box. If you have an Apple machine, say N here; if you
800 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
801 you have an embedded board, consult your board documentation.
803 config GENERIC_ISA_DMA
805 depends on PPC64 || POWER4 || 6xx && !CPM2
812 config PPC_INDIRECT_PCI
815 default y if 40x || 44x
827 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
832 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) \
834 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
835 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
836 default PCI_QSPAN if !4xx && !CPM2 && 8xx
838 Find out whether your system includes a PCI bus. PCI is the name of
839 a bus system, i.e. the way the CPU talks to the other stuff inside
840 your box. If you say Y here, the kernel will include drivers and
841 infrastructure code to support PCI bus devices.
849 depends on !4xx && !CPM2 && 8xx
852 Say Y here if you have a system based on a Motorola 8xx-series
853 embedded processor with a QSPAN PCI interface, otherwise say N.
857 depends on PCI && 8260
858 select PPC_INDIRECT_PCI
862 bool "Enable workaround for MPC826x erratum PCI 9"
863 depends on PCI_8260 && !ADS8272
867 prompt "IDMA channel for PCI 9 workaround"
870 config 8260_PCI9_IDMA1
873 config 8260_PCI9_IDMA2
876 config 8260_PCI9_IDMA3
879 config 8260_PCI9_IDMA4
884 source "drivers/pci/pcie/Kconfig"
886 source "drivers/pci/Kconfig"
888 source "drivers/pcmcia/Kconfig"
890 source "drivers/pci/hotplug/Kconfig"
894 menu "Advanced setup"
897 config ADVANCED_OPTIONS
898 bool "Prompt for advanced kernel configuration options"
900 This option will enable prompting for a variety of advanced kernel
901 configuration options. These options can cause the kernel to not
902 work if they are set incorrectly, but can be used to optimize certain
903 aspects of kernel memory management.
905 Unless you know what you are doing, say N here.
907 comment "Default settings for advanced configuration options are used"
908 depends on !ADVANCED_OPTIONS
910 config HIGHMEM_START_BOOL
911 bool "Set high memory pool address"
912 depends on ADVANCED_OPTIONS && HIGHMEM
914 This option allows you to set the base address of the kernel virtual
915 area used to map high memory pages. This can be useful in
916 optimizing the layout of kernel virtual memory.
918 Say N here unless you know what you are doing.
921 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
924 config LOWMEM_SIZE_BOOL
925 bool "Set maximum low memory"
926 depends on ADVANCED_OPTIONS
928 This option allows you to set the maximum amount of memory which
929 will be used as "low memory", that is, memory which the kernel can
930 access directly, without having to set up a kernel virtual mapping.
931 This can be useful in optimizing the layout of kernel virtual
934 Say N here unless you know what you are doing.
937 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
940 config KERNEL_START_BOOL
941 bool "Set custom kernel base address"
942 depends on ADVANCED_OPTIONS
944 This option allows you to set the kernel virtual address at which
945 the kernel will map low memory (the kernel image will be linked at
946 this address). This can be useful in optimizing the virtual memory
947 layout of the system.
949 Say N here unless you know what you are doing.
952 hex "Virtual address of kernel base" if KERNEL_START_BOOL
955 config TASK_SIZE_BOOL
956 bool "Set custom user task size"
957 depends on ADVANCED_OPTIONS
959 This option allows you to set the amount of virtual address space
960 allocated to user tasks. This can be useful in optimizing the
961 virtual memory layout of the system.
963 Say N here unless you know what you are doing.
966 hex "Size of user task space" if TASK_SIZE_BOOL
969 config CONSISTENT_START_BOOL
970 bool "Set custom consistent memory pool address"
971 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
973 This option allows you to set the base virtual address
974 of the the consistent memory pool. This pool of virtual
975 memory is used to make consistent memory allocations.
977 config CONSISTENT_START
978 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
979 default "0xff100000" if NOT_COHERENT_CACHE
981 config CONSISTENT_SIZE_BOOL
982 bool "Set custom consistent memory pool size"
983 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
985 This option allows you to set the size of the the
986 consistent memory pool. This pool of virtual memory
987 is used to make consistent memory allocations.
989 config CONSISTENT_SIZE
990 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
991 default "0x00200000" if NOT_COHERENT_CACHE
993 config BOOT_LOAD_BOOL
994 bool "Set the boot link/load address"
995 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
997 This option allows you to set the initial load address of the zImage
998 or zImage.initrd file. This can be useful if you are on a board
999 which has a small amount of memory.
1001 Say N here unless you know what you are doing.
1004 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1005 default "0x00400000" if 40x || 8xx || 8260
1006 default "0x01000000" if 44x
1007 default "0x00800000"
1010 bool "Pinned Kernel TLBs (860 ONLY)"
1011 depends on ADVANCED_OPTIONS && 8xx
1017 default "0xc000000000000000"
1020 source "net/Kconfig"
1022 source "drivers/Kconfig"
1026 # XXX source "arch/ppc/8xx_io/Kconfig"
1028 # XXX source "arch/ppc/8260_io/Kconfig"
1030 source "arch/powerpc/platforms/iseries/Kconfig"
1032 source "lib/Kconfig"
1034 menu "Instrumentation Support"
1035 depends on EXPERIMENTAL
1037 source "arch/powerpc/oprofile/Kconfig"
1040 bool "Kprobes (EXPERIMENTAL)"
1041 depends on PPC64 && EXPERIMENTAL && MODULES
1043 Kprobes allows you to trap at almost any kernel address and
1044 execute a callback function. register_kprobe() establishes
1045 a probepoint and specifies the callback. Kprobes is useful
1046 for kernel debugging, non-intrusive instrumentation and testing.
1047 If in doubt, say "N".
1050 source "arch/powerpc/Kconfig.debug"
1052 source "security/Kconfig"
1056 depends on COMPAT && KEYS
1059 source "crypto/Kconfig"