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/>.
355 depends on PPC_MULTIPLATFORM && PPC64
356 bool "IBM pSeries & new (POWER5-based) iSeries"
360 select RTAS_ERROR_LOGGING
361 select PPC_UDBG_16550
365 bool "IBM Legacy iSeries"
366 depends on PPC_MULTIPLATFORM && PPC64
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>
421 depends on PPC_MULTIPLATFORM && PPC64
422 bool "PA Semi SoC-based platforms"
425 select PPC_UDBG_16550
426 select GENERIC_TBSYNC
428 This option enables support for PA Semi's PWRficient line
429 of SoC processors, including PA6T-1682M
435 config PPC_CELL_NATIVE
440 config PPC_IBM_CELL_BLADE
441 bool "IBM Cell Blade"
442 depends on PPC_MULTIPLATFORM && PPC64
443 select PPC_CELL_NATIVE
446 select PPC_UDBG_16550
447 select UDBG_RTAS_CONSOLE
449 config UDBG_RTAS_CONSOLE
450 bool "RTAS based debug console"
455 depends on PPC_PSERIES
461 depends on PPC_MULTIPLATFORM && PPC64
468 config RTAS_ERROR_LOGGING
474 bool "Proc interface to RTAS"
479 tristate "Firmware flash interface"
480 depends on PPC64 && RTAS_PROC
486 config MPIC_BROKEN_U3
492 depends on PPC_PSERIES || PPC_ISERIES
497 depends on PPC_PSERIES
498 bool "Support for GX bus based adapters"
500 Bus device driver for GX bus based adapters.
510 source "drivers/cpufreq/Kconfig"
513 bool "Support for Apple PowerBooks"
514 depends on CPU_FREQ && ADB_PMU && PPC32
515 select CPU_FREQ_TABLE
517 This adds support for frequency switching on Apple PowerBooks,
518 this currently includes some models of iBook & Titanium
521 config CPU_FREQ_PMAC64
522 bool "Support for some Apple G5s"
523 depends on CPU_FREQ && PPC64
524 select CPU_FREQ_TABLE
526 This adds support for frequency switching on Apple iMac G5,
527 and some of the more recent desktop G5 machines as well.
529 config PPC601_SYNC_FIX
530 bool "Workarounds for PPC601 bugs"
531 depends on 6xx && (PPC_PREP || PPC_PMAC)
533 Some versions of the PPC601 (the first PowerPC chip) have bugs which
534 mean that extra synchronization instructions are required near
535 certain instructions, typically those that make major changes to the
536 CPU state. These extra instructions reduce performance slightly.
537 If you say N here, these extra instructions will not be included,
538 resulting in a kernel which will run faster but may not run at all
539 on some systems with the PPC601 chip.
541 If in doubt, say Y here.
544 bool "On-chip CPU temperature sensor support"
547 G3 and G4 processors have an on-chip temperature sensor called the
548 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
549 temperature within 2-4 degrees Celsius. This option shows the current
550 on-die temperature in /proc/cpuinfo if the cpu supports it.
552 Unfortunately, on some chip revisions, this sensor is very inaccurate
553 and in many cases, does not work at all, so don't assume the cpu
554 temp is actually what /proc/cpuinfo says it is.
557 bool "Interrupt driven TAU driver (DANGEROUS)"
560 The TAU supports an interrupt driven mode which causes an interrupt
561 whenever the temperature goes out of range. This is the fastest way
562 to get notified the temp has exceeded a range. With this option off,
563 a timer is used to re-check the temperature periodically.
565 However, on some cpus it appears that the TAU interrupt hardware
566 is buggy and can cause a situation which would lead unexplained hard
569 Unless you are extending the TAU driver, or enjoy kernel/hardware
570 debugging, leave this option off.
573 bool "Average high and low temp"
576 The TAU hardware can compare the temperature to an upper and lower
577 bound. The default behavior is to show both the upper and lower
578 bound in /proc/cpuinfo. If the range is large, the temperature is
579 either changing a lot, or the TAU hardware is broken (likely on some
580 G4's). If the range is small (around 4 degrees), the temperature is
581 relatively stable. If you say Y here, a single temperature value,
582 halfway between the upper and lower bounds, will be reported in
585 If in doubt, say N here.
588 depends on EMBEDDED6xx
589 bool "Generic Time-of-day Clock (TODC) support"
591 This adds support for many TODC/RTC chips.
595 source arch/powerpc/platforms/embedded6xx/Kconfig
596 source arch/powerpc/platforms/4xx/Kconfig
597 source arch/powerpc/platforms/83xx/Kconfig
598 source arch/powerpc/platforms/85xx/Kconfig
599 source arch/powerpc/platforms/86xx/Kconfig
600 source arch/powerpc/platforms/8xx/Kconfig
601 source arch/powerpc/platforms/cell/Kconfig
603 menu "Kernel options"
606 bool "High memory support"
609 source kernel/Kconfig.hz
610 source kernel/Kconfig.preempt
611 source "fs/Kconfig.binfmt"
613 # We optimistically allocate largepages from the VM, so make the limit
614 # large enough (16MB). This badly named config option is actually
616 config FORCE_MAX_ZONEORDER
619 default "9" if PPC_64K_PAGES
622 config MATH_EMULATION
623 bool "Math emulation"
624 depends on 4xx || 8xx || E200 || E500
626 Some PowerPC chips designed for embedded applications do not have
627 a floating-point unit and therefore do not implement the
628 floating-point instructions in the PowerPC instruction set. If you
629 say Y here, the kernel will include code to emulate a floating-point
630 unit, which will allow programs that use floating-point
634 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
635 depends on EXPERIMENTAL && PPC64
638 Cause IO segments sent to a device for DMA to be merged virtually
639 by the IOMMU when they happen to have been allocated contiguously.
640 This doesn't add pressure to the IOMMU allocator. However, some
641 drivers don't support getting large merged segments coming back
642 from *_map_sg(). Say Y if you know the drivers you are using are
643 properly handling this case.
646 bool "Support for enabling/disabling CPUs"
647 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
649 Say Y here to be able to disable and re-enable individual
650 CPUs at runtime on SMP machines.
652 Say N if you are unsure.
654 config ARCH_ENABLE_MEMORY_HOTPLUG
658 bool "kexec system call (EXPERIMENTAL)"
659 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
661 kexec is a system call that implements the ability to shutdown your
662 current kernel, and to start another kernel. It is like a reboot
663 but it is independent of the system firmware. And like a reboot
664 you can start any kernel with it, not just Linux.
666 The name comes from the similarity to the exec system call.
668 It is an ongoing process to be certain the hardware in a machine
669 is properly shutdown, so do not be surprised if this code does not
670 initially work for you. It may help to enable device hotplugging
671 support. As of this writing the exact hardware interface is
672 strongly in flux, so no good recommendation can be made.
675 bool "Build a kdump crash kernel (EXPERIMENTAL)"
676 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
678 Build a kernel suitable for use as a kdump capture kernel.
679 The kernel will be linked at a different address than normal, and
680 so can only be used for Kdump.
682 Don't change this unless you know what you are doing.
686 depends on 8xx || 8260
690 bool "PC PS/2 style Keyboard"
691 depends on 4xx || CPM2
694 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
695 default y if PPC_PREP
698 bool "Distribute interrupts on all CPUs by default"
699 depends on SMP && !MV64360
701 This option gives the kernel permission to distribute IRQs across
702 multiple CPUs. Saying N here will route all IRQs to the first
703 CPU. Generally saying Y is safe, although some problems have been
704 reported with SMP Power Macintoshes with this option enabled.
706 source "arch/powerpc/platforms/pseries/Kconfig"
711 default y if SMP && PPC_PSERIES
716 depends on NEED_MULTIPLE_NODES
718 config ARCH_SELECT_MEMORY_MODEL
722 config ARCH_FLATMEM_ENABLE
724 depends on (PPC64 && !NUMA) || PPC32
726 config ARCH_SPARSEMEM_ENABLE
730 config ARCH_SPARSEMEM_DEFAULT
732 depends on SMP && PPC_PSERIES
736 config HAVE_ARCH_EARLY_PFN_TO_NID
738 depends on NEED_MULTIPLE_NODES
740 config ARCH_MEMORY_PROBE
742 depends on MEMORY_HOTPLUG
748 This option changes the kernel logical page size to 64k. On machines
749 without processor support for 64k pages, the kernel will simulate
750 them by loading each individual 4k page on demand transparently,
751 while on hardware with such support, it will be used to map
752 normal application pages.
755 bool "SMT (Hyperthreading) scheduler support"
756 depends on PPC64 && SMP
758 SMT scheduler support improves the CPU scheduler's decision making
759 when dealing with POWER5 cpus at a cost of slightly increased
760 overhead in some places. If unsure say N here.
762 config PROC_DEVICETREE
763 bool "Support for device tree in /proc"
766 This option adds a device-tree directory under /proc which contains
767 an image of the device tree that the kernel copies from Open
768 Firmware or other boot firmware. If unsure, say Y here.
770 source "arch/powerpc/platforms/prep/Kconfig"
773 bool "Default bootloader kernel arguments"
774 depends on !PPC_ISERIES
777 string "Initial kernel command string"
778 depends on CMDLINE_BOOL
779 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
781 On some platforms, there is currently no way for the boot loader to
782 pass arguments to the kernel. For these platforms, you can supply
783 some command-line options at build time by entering them here. In
784 most cases you will need to specify the root device here.
787 source kernel/power/Kconfig
791 bool "Enable seccomp to safely compute untrusted bytecode"
795 This kernel feature is useful for number crunching applications
796 that may need to compute untrusted bytecode during their
797 execution. By using pipes or other transports made available to
798 the process as file descriptors supporting the read/write
799 syscalls, it's possible to isolate those applications in
800 their own address space using seccomp. Once seccomp is
801 enabled via /proc/<pid>/seccomp, it cannot be disabled
802 and the task is only allowed to execute a few safe syscalls
803 defined by each seccomp mode.
805 If unsure, say Y. Only embedded should say N here.
816 bool "Support for ISA-bus hardware"
817 depends on PPC_PREP || PPC_CHRP
820 Find out whether you have ISA slots on your motherboard. ISA is the
821 name of a bus system, i.e. the way the CPU talks to the other stuff
822 inside your box. If you have an Apple machine, say N here; if you
823 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
824 you have an embedded board, consult your board documentation.
826 config GENERIC_ISA_DMA
828 depends on PPC64 || POWER4 || 6xx && !CPM2
843 config PPC_INDIRECT_PCI
846 default y if 40x || 44x
858 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
863 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
864 || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) || MPC7448HPC2
865 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
866 && !PPC_85xx && !PPC_86xx
867 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
868 default PCI_QSPAN if !4xx && !CPM2 && 8xx
870 Find out whether your system includes a PCI bus. PCI is the name of
871 a bus system, i.e. the way the CPU talks to the other stuff inside
872 your box. If you say Y here, the kernel will include drivers and
873 infrastructure code to support PCI bus devices.
881 depends on !4xx && !CPM2 && 8xx
884 Say Y here if you have a system based on a Motorola 8xx-series
885 embedded processor with a QSPAN PCI interface, otherwise say N.
889 depends on PCI && 8260
890 select PPC_INDIRECT_PCI
894 bool "Enable workaround for MPC826x erratum PCI 9"
895 depends on PCI_8260 && !ADS8272
899 prompt "IDMA channel for PCI 9 workaround"
902 config 8260_PCI9_IDMA1
905 config 8260_PCI9_IDMA2
908 config 8260_PCI9_IDMA3
911 config 8260_PCI9_IDMA4
916 source "drivers/pci/pcie/Kconfig"
918 source "drivers/pci/Kconfig"
920 source "drivers/pcmcia/Kconfig"
922 source "drivers/pci/hotplug/Kconfig"
926 menu "Advanced setup"
929 config ADVANCED_OPTIONS
930 bool "Prompt for advanced kernel configuration options"
932 This option will enable prompting for a variety of advanced kernel
933 configuration options. These options can cause the kernel to not
934 work if they are set incorrectly, but can be used to optimize certain
935 aspects of kernel memory management.
937 Unless you know what you are doing, say N here.
939 comment "Default settings for advanced configuration options are used"
940 depends on !ADVANCED_OPTIONS
942 config HIGHMEM_START_BOOL
943 bool "Set high memory pool address"
944 depends on ADVANCED_OPTIONS && HIGHMEM
946 This option allows you to set the base address of the kernel virtual
947 area used to map high memory pages. This can be useful in
948 optimizing the layout of kernel virtual memory.
950 Say N here unless you know what you are doing.
953 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
956 config LOWMEM_SIZE_BOOL
957 bool "Set maximum low memory"
958 depends on ADVANCED_OPTIONS
960 This option allows you to set the maximum amount of memory which
961 will be used as "low memory", that is, memory which the kernel can
962 access directly, without having to set up a kernel virtual mapping.
963 This can be useful in optimizing the layout of kernel virtual
966 Say N here unless you know what you are doing.
969 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
972 config KERNEL_START_BOOL
973 bool "Set custom kernel base address"
974 depends on ADVANCED_OPTIONS
976 This option allows you to set the kernel virtual address at which
977 the kernel will map low memory (the kernel image will be linked at
978 this address). This can be useful in optimizing the virtual memory
979 layout of the system.
981 Say N here unless you know what you are doing.
984 hex "Virtual address of kernel base" if KERNEL_START_BOOL
987 config TASK_SIZE_BOOL
988 bool "Set custom user task size"
989 depends on ADVANCED_OPTIONS
991 This option allows you to set the amount of virtual address space
992 allocated to user tasks. This can be useful in optimizing the
993 virtual memory layout of the system.
995 Say N here unless you know what you are doing.
998 hex "Size of user task space" if TASK_SIZE_BOOL
1001 config CONSISTENT_START_BOOL
1002 bool "Set custom consistent memory pool address"
1003 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1005 This option allows you to set the base virtual address
1006 of the the consistent memory pool. This pool of virtual
1007 memory is used to make consistent memory allocations.
1009 config CONSISTENT_START
1010 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
1011 default "0xff100000" if NOT_COHERENT_CACHE
1013 config CONSISTENT_SIZE_BOOL
1014 bool "Set custom consistent memory pool size"
1015 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1017 This option allows you to set the size of the the
1018 consistent memory pool. This pool of virtual memory
1019 is used to make consistent memory allocations.
1021 config CONSISTENT_SIZE
1022 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1023 default "0x00200000" if NOT_COHERENT_CACHE
1025 config BOOT_LOAD_BOOL
1026 bool "Set the boot link/load address"
1027 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1029 This option allows you to set the initial load address of the zImage
1030 or zImage.initrd file. This can be useful if you are on a board
1031 which has a small amount of memory.
1033 Say N here unless you know what you are doing.
1036 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1037 default "0x00400000" if 40x || 8xx || 8260
1038 default "0x01000000" if 44x
1039 default "0x00800000"
1042 bool "Pinned Kernel TLBs (860 ONLY)"
1043 depends on ADVANCED_OPTIONS && 8xx
1049 default "0xc000000000000000"
1052 source "net/Kconfig"
1054 source "drivers/Kconfig"
1058 # XXX source "arch/ppc/8xx_io/Kconfig"
1060 # XXX source "arch/ppc/8260_io/Kconfig"
1062 source "arch/powerpc/platforms/iseries/Kconfig"
1064 source "lib/Kconfig"
1066 menu "Instrumentation Support"
1067 depends on EXPERIMENTAL
1069 source "arch/powerpc/oprofile/Kconfig"
1072 bool "Kprobes (EXPERIMENTAL)"
1073 depends on PPC64 && EXPERIMENTAL && MODULES
1075 Kprobes allows you to trap at almost any kernel address and
1076 execute a callback function. register_kprobe() establishes
1077 a probepoint and specifies the callback. Kprobes is useful
1078 for kernel debugging, non-intrusive instrumentation and testing.
1079 If in doubt, say "N".
1082 source "arch/powerpc/Kconfig.debug"
1084 source "security/Kconfig"
1088 depends on COMPAT && KEYS
1091 source "crypto/Kconfig"