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 "Embedded 6xx/7xx/7xxx-based board"
343 depends on PPC32 && (BROKEN||BROKEN_ON_SMP)
347 depends on PPC32 && BROKEN
349 Select APUS if configuring for a PowerUP Amiga.
350 More information is available at:
351 <http://linux-apus.sourceforge.net/>.
356 depends on PPC_MPC836x || PPC_MPC832x
359 The QUICC Engine (QE) is a new generation of communications
360 coprocessors on Freescale embedded CPUs (akin to CPM in older chips).
361 Selecting this option means that you wish to build a kernel
362 for a machine with a QE coprocessor.
365 depends on PPC_MULTIPLATFORM && PPC64
366 bool "IBM pSeries & new (POWER5-based) iSeries"
370 select RTAS_ERROR_LOGGING
371 select PPC_UDBG_16550
375 bool "IBM Legacy iSeries"
376 depends on PPC_MULTIPLATFORM && PPC64
379 bool "Common Hardware Reference Platform (CHRP) based machines"
380 depends on PPC_MULTIPLATFORM && PPC32
383 select PPC_INDIRECT_PCI
386 select PPC_UDBG_16550
390 bool "Apple PowerMac based machines"
391 depends on PPC_MULTIPLATFORM
393 select PPC_INDIRECT_PCI if PPC32
394 select PPC_MPC106 if PPC32
399 depends on PPC_PMAC && POWER4
402 select MPIC_BROKEN_U3
403 select GENERIC_TBSYNC
408 bool "PowerPC Reference Platform (PReP) based machines"
409 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
412 select PPC_INDIRECT_PCI
413 select PPC_UDBG_16550
417 depends on PPC_MULTIPLATFORM && PPC64
418 bool "Maple 970FX Evaluation Board"
421 select MPIC_BROKEN_U3
422 select GENERIC_TBSYNC
423 select PPC_UDBG_16550
427 This option enables support for the Maple 970FX Evaluation Board.
428 For more informations, refer to <http://www.970eval.com>
431 depends on PPC_MULTIPLATFORM && PPC64
432 bool "PA Semi SoC-based platforms"
435 select PPC_UDBG_16550
436 select GENERIC_TBSYNC
438 This option enables support for PA Semi's PWRficient line
439 of SoC processors, including PA6T-1682M
445 config PPC_CELL_NATIVE
450 config PPC_IBM_CELL_BLADE
451 bool "IBM Cell Blade"
452 depends on PPC_MULTIPLATFORM && PPC64
453 select PPC_CELL_NATIVE
456 select PPC_UDBG_16550
457 select UDBG_RTAS_CONSOLE
459 config UDBG_RTAS_CONSOLE
460 bool "RTAS based debug console"
465 depends on PPC_PSERIES
471 depends on PPC_MULTIPLATFORM && PPC64
478 config RTAS_ERROR_LOGGING
484 bool "Proc interface to RTAS"
489 tristate "Firmware flash interface"
490 depends on PPC64 && RTAS_PROC
496 config MPIC_BROKEN_U3
502 depends on PPC_PSERIES || PPC_ISERIES
507 depends on PPC_PSERIES
508 bool "Support for GX bus based adapters"
510 Bus device driver for GX bus based adapters.
520 source "drivers/cpufreq/Kconfig"
523 bool "Support for Apple PowerBooks"
524 depends on CPU_FREQ && ADB_PMU && PPC32
525 select CPU_FREQ_TABLE
527 This adds support for frequency switching on Apple PowerBooks,
528 this currently includes some models of iBook & Titanium
531 config CPU_FREQ_PMAC64
532 bool "Support for some Apple G5s"
533 depends on CPU_FREQ && PPC64
534 select CPU_FREQ_TABLE
536 This adds support for frequency switching on Apple iMac G5,
537 and some of the more recent desktop G5 machines as well.
539 config PPC601_SYNC_FIX
540 bool "Workarounds for PPC601 bugs"
541 depends on 6xx && (PPC_PREP || PPC_PMAC)
543 Some versions of the PPC601 (the first PowerPC chip) have bugs which
544 mean that extra synchronization instructions are required near
545 certain instructions, typically those that make major changes to the
546 CPU state. These extra instructions reduce performance slightly.
547 If you say N here, these extra instructions will not be included,
548 resulting in a kernel which will run faster but may not run at all
549 on some systems with the PPC601 chip.
551 If in doubt, say Y here.
554 bool "On-chip CPU temperature sensor support"
557 G3 and G4 processors have an on-chip temperature sensor called the
558 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
559 temperature within 2-4 degrees Celsius. This option shows the current
560 on-die temperature in /proc/cpuinfo if the cpu supports it.
562 Unfortunately, on some chip revisions, this sensor is very inaccurate
563 and in many cases, does not work at all, so don't assume the cpu
564 temp is actually what /proc/cpuinfo says it is.
567 bool "Interrupt driven TAU driver (DANGEROUS)"
570 The TAU supports an interrupt driven mode which causes an interrupt
571 whenever the temperature goes out of range. This is the fastest way
572 to get notified the temp has exceeded a range. With this option off,
573 a timer is used to re-check the temperature periodically.
575 However, on some cpus it appears that the TAU interrupt hardware
576 is buggy and can cause a situation which would lead unexplained hard
579 Unless you are extending the TAU driver, or enjoy kernel/hardware
580 debugging, leave this option off.
583 bool "Average high and low temp"
586 The TAU hardware can compare the temperature to an upper and lower
587 bound. The default behavior is to show both the upper and lower
588 bound in /proc/cpuinfo. If the range is large, the temperature is
589 either changing a lot, or the TAU hardware is broken (likely on some
590 G4's). If the range is small (around 4 degrees), the temperature is
591 relatively stable. If you say Y here, a single temperature value,
592 halfway between the upper and lower bounds, will be reported in
595 If in doubt, say N here.
598 depends on EMBEDDED6xx
599 bool "Generic Time-of-day Clock (TODC) support"
601 This adds support for many TODC/RTC chips.
605 source arch/powerpc/platforms/embedded6xx/Kconfig
606 source arch/powerpc/platforms/4xx/Kconfig
607 source arch/powerpc/platforms/82xx/Kconfig
608 source arch/powerpc/platforms/83xx/Kconfig
609 source arch/powerpc/platforms/85xx/Kconfig
610 source arch/powerpc/platforms/86xx/Kconfig
611 source arch/powerpc/platforms/8xx/Kconfig
612 source arch/powerpc/platforms/cell/Kconfig
614 menu "Kernel options"
617 bool "High memory support"
620 source kernel/Kconfig.hz
621 source kernel/Kconfig.preempt
622 source "fs/Kconfig.binfmt"
624 # We optimistically allocate largepages from the VM, so make the limit
625 # large enough (16MB). This badly named config option is actually
627 config FORCE_MAX_ZONEORDER
630 default "9" if PPC_64K_PAGES
633 config MATH_EMULATION
634 bool "Math emulation"
635 depends on 4xx || 8xx || E200 || E500
637 Some PowerPC chips designed for embedded applications do not have
638 a floating-point unit and therefore do not implement the
639 floating-point instructions in the PowerPC instruction set. If you
640 say Y here, the kernel will include code to emulate a floating-point
641 unit, which will allow programs that use floating-point
645 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
646 depends on EXPERIMENTAL && PPC64
649 Cause IO segments sent to a device for DMA to be merged virtually
650 by the IOMMU when they happen to have been allocated contiguously.
651 This doesn't add pressure to the IOMMU allocator. However, some
652 drivers don't support getting large merged segments coming back
653 from *_map_sg(). Say Y if you know the drivers you are using are
654 properly handling this case.
657 bool "Support for enabling/disabling CPUs"
658 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
660 Say Y here to be able to disable and re-enable individual
661 CPUs at runtime on SMP machines.
663 Say N if you are unsure.
665 config ARCH_ENABLE_MEMORY_HOTPLUG
669 bool "kexec system call (EXPERIMENTAL)"
670 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
672 kexec is a system call that implements the ability to shutdown your
673 current kernel, and to start another kernel. It is like a reboot
674 but it is independent of the system firmware. And like a reboot
675 you can start any kernel with it, not just Linux.
677 The name comes from the similarity to the exec system call.
679 It is an ongoing process to be certain the hardware in a machine
680 is properly shutdown, so do not be surprised if this code does not
681 initially work for you. It may help to enable device hotplugging
682 support. As of this writing the exact hardware interface is
683 strongly in flux, so no good recommendation can be made.
686 bool "Build a kdump crash kernel (EXPERIMENTAL)"
687 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
689 Build a kernel suitable for use as a kdump capture kernel.
690 The kernel will be linked at a different address than normal, and
691 so can only be used for Kdump.
693 Don't change this unless you know what you are doing.
697 depends on 8xx || 8260
701 bool "PC PS/2 style Keyboard"
702 depends on 4xx || CPM2
705 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
706 default y if PPC_PREP
709 bool "Distribute interrupts on all CPUs by default"
710 depends on SMP && !MV64360
712 This option gives the kernel permission to distribute IRQs across
713 multiple CPUs. Saying N here will route all IRQs to the first
714 CPU. Generally saying Y is safe, although some problems have been
715 reported with SMP Power Macintoshes with this option enabled.
717 source "arch/powerpc/platforms/pseries/Kconfig"
722 default y if SMP && PPC_PSERIES
727 depends on NEED_MULTIPLE_NODES
729 config ARCH_SELECT_MEMORY_MODEL
733 config ARCH_FLATMEM_ENABLE
735 depends on (PPC64 && !NUMA) || PPC32
737 config ARCH_SPARSEMEM_ENABLE
741 config ARCH_SPARSEMEM_DEFAULT
743 depends on SMP && PPC_PSERIES
745 config ARCH_POPULATES_NODE_MAP
750 config ARCH_MEMORY_PROBE
752 depends on MEMORY_HOTPLUG
758 This option changes the kernel logical page size to 64k. On machines
759 without processor support for 64k pages, the kernel will simulate
760 them by loading each individual 4k page on demand transparently,
761 while on hardware with such support, it will be used to map
762 normal application pages.
765 bool "SMT (Hyperthreading) scheduler support"
766 depends on PPC64 && SMP
768 SMT scheduler support improves the CPU scheduler's decision making
769 when dealing with POWER5 cpus at a cost of slightly increased
770 overhead in some places. If unsure say N here.
772 config PROC_DEVICETREE
773 bool "Support for device tree in /proc"
776 This option adds a device-tree directory under /proc which contains
777 an image of the device tree that the kernel copies from Open
778 Firmware or other boot firmware. If unsure, say Y here.
780 source "arch/powerpc/platforms/prep/Kconfig"
783 bool "Default bootloader kernel arguments"
784 depends on !PPC_ISERIES
787 string "Initial kernel command string"
788 depends on CMDLINE_BOOL
789 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
791 On some platforms, there is currently no way for the boot loader to
792 pass arguments to the kernel. For these platforms, you can supply
793 some command-line options at build time by entering them here. In
794 most cases you will need to specify the root device here.
797 source kernel/power/Kconfig
801 bool "Enable seccomp to safely compute untrusted bytecode"
805 This kernel feature is useful for number crunching applications
806 that may need to compute untrusted bytecode during their
807 execution. By using pipes or other transports made available to
808 the process as file descriptors supporting the read/write
809 syscalls, it's possible to isolate those applications in
810 their own address space using seccomp. Once seccomp is
811 enabled via /proc/<pid>/seccomp, it cannot be disabled
812 and the task is only allowed to execute a few safe syscalls
813 defined by each seccomp mode.
815 If unsure, say Y. Only embedded should say N here.
826 bool "Support for ISA-bus hardware"
827 depends on PPC_PREP || PPC_CHRP
830 Find out whether you have ISA slots on your motherboard. ISA is the
831 name of a bus system, i.e. the way the CPU talks to the other stuff
832 inside your box. If you have an Apple machine, say N here; if you
833 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
834 you have an embedded board, consult your board documentation.
836 config GENERIC_ISA_DMA
838 depends on PPC64 || POWER4 || 6xx && !CPM2
853 config PPC_INDIRECT_PCI
856 default y if 40x || 44x
868 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
873 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
874 || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) || MPC7448HPC2
875 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
876 && !PPC_85xx && !PPC_86xx
877 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
878 default PCI_QSPAN if !4xx && !CPM2 && 8xx
880 Find out whether your system includes a PCI bus. PCI is the name of
881 a bus system, i.e. the way the CPU talks to the other stuff inside
882 your box. If you say Y here, the kernel will include drivers and
883 infrastructure code to support PCI bus devices.
891 depends on !4xx && !CPM2 && 8xx
894 Say Y here if you have a system based on a Motorola 8xx-series
895 embedded processor with a QSPAN PCI interface, otherwise say N.
899 depends on PCI && 8260
900 select PPC_INDIRECT_PCI
904 bool "Enable workaround for MPC826x erratum PCI 9"
905 depends on PCI_8260 && !ADS8272
909 prompt "IDMA channel for PCI 9 workaround"
912 config 8260_PCI9_IDMA1
915 config 8260_PCI9_IDMA2
918 config 8260_PCI9_IDMA3
921 config 8260_PCI9_IDMA4
926 source "drivers/pci/pcie/Kconfig"
928 source "drivers/pci/Kconfig"
930 source "drivers/pcmcia/Kconfig"
932 source "drivers/pci/hotplug/Kconfig"
936 menu "Advanced setup"
939 config ADVANCED_OPTIONS
940 bool "Prompt for advanced kernel configuration options"
942 This option will enable prompting for a variety of advanced kernel
943 configuration options. These options can cause the kernel to not
944 work if they are set incorrectly, but can be used to optimize certain
945 aspects of kernel memory management.
947 Unless you know what you are doing, say N here.
949 comment "Default settings for advanced configuration options are used"
950 depends on !ADVANCED_OPTIONS
952 config HIGHMEM_START_BOOL
953 bool "Set high memory pool address"
954 depends on ADVANCED_OPTIONS && HIGHMEM
956 This option allows you to set the base address of the kernel virtual
957 area used to map high memory pages. This can be useful in
958 optimizing the layout of kernel virtual memory.
960 Say N here unless you know what you are doing.
963 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
966 config LOWMEM_SIZE_BOOL
967 bool "Set maximum low memory"
968 depends on ADVANCED_OPTIONS
970 This option allows you to set the maximum amount of memory which
971 will be used as "low memory", that is, memory which the kernel can
972 access directly, without having to set up a kernel virtual mapping.
973 This can be useful in optimizing the layout of kernel virtual
976 Say N here unless you know what you are doing.
979 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
982 config KERNEL_START_BOOL
983 bool "Set custom kernel base address"
984 depends on ADVANCED_OPTIONS
986 This option allows you to set the kernel virtual address at which
987 the kernel will map low memory (the kernel image will be linked at
988 this address). This can be useful in optimizing the virtual memory
989 layout of the system.
991 Say N here unless you know what you are doing.
994 hex "Virtual address of kernel base" if KERNEL_START_BOOL
997 config TASK_SIZE_BOOL
998 bool "Set custom user task size"
999 depends on ADVANCED_OPTIONS
1001 This option allows you to set the amount of virtual address space
1002 allocated to user tasks. This can be useful in optimizing the
1003 virtual memory layout of the system.
1005 Say N here unless you know what you are doing.
1008 hex "Size of user task space" if TASK_SIZE_BOOL
1009 default "0x80000000"
1011 config CONSISTENT_START_BOOL
1012 bool "Set custom consistent memory pool address"
1013 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1015 This option allows you to set the base virtual address
1016 of the consistent memory pool. This pool of virtual
1017 memory is used to make consistent memory allocations.
1019 config CONSISTENT_START
1020 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
1021 default "0xff100000" if NOT_COHERENT_CACHE
1023 config CONSISTENT_SIZE_BOOL
1024 bool "Set custom consistent memory pool size"
1025 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1027 This option allows you to set the size of the
1028 consistent memory pool. This pool of virtual memory
1029 is used to make consistent memory allocations.
1031 config CONSISTENT_SIZE
1032 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1033 default "0x00200000" if NOT_COHERENT_CACHE
1035 config BOOT_LOAD_BOOL
1036 bool "Set the boot link/load address"
1037 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1039 This option allows you to set the initial load address of the zImage
1040 or zImage.initrd file. This can be useful if you are on a board
1041 which has a small amount of memory.
1043 Say N here unless you know what you are doing.
1046 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1047 default "0x00400000" if 40x || 8xx || 8260
1048 default "0x01000000" if 44x
1049 default "0x00800000"
1052 bool "Pinned Kernel TLBs (860 ONLY)"
1053 depends on ADVANCED_OPTIONS && 8xx
1059 default "0xc000000000000000"
1062 source "net/Kconfig"
1064 source "drivers/Kconfig"
1068 # XXX source "arch/ppc/8xx_io/Kconfig"
1070 # XXX source "arch/ppc/8260_io/Kconfig"
1072 source "arch/powerpc/sysdev/qe_lib/Kconfig"
1074 source "arch/powerpc/platforms/iseries/Kconfig"
1076 source "lib/Kconfig"
1078 menu "Instrumentation Support"
1079 depends on EXPERIMENTAL
1081 source "arch/powerpc/oprofile/Kconfig"
1084 bool "Kprobes (EXPERIMENTAL)"
1085 depends on PPC64 && KALLSYMS && EXPERIMENTAL && MODULES
1087 Kprobes allows you to trap at almost any kernel address and
1088 execute a callback function. register_kprobe() establishes
1089 a probepoint and specifies the callback. Kprobes is useful
1090 for kernel debugging, non-intrusive instrumentation and testing.
1091 If in doubt, say "N".
1094 source "arch/powerpc/Kconfig.debug"
1096 source "security/Kconfig"
1100 depends on COMPAT && KEYS
1103 source "crypto/Kconfig"