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.
599 source arch/powerpc/platforms/embedded6xx/Kconfig
600 source arch/powerpc/platforms/4xx/Kconfig
601 source arch/powerpc/platforms/82xx/Kconfig
602 source arch/powerpc/platforms/83xx/Kconfig
603 source arch/powerpc/platforms/85xx/Kconfig
604 source arch/powerpc/platforms/86xx/Kconfig
605 source arch/powerpc/platforms/8xx/Kconfig
606 source arch/powerpc/platforms/cell/Kconfig
608 menu "Kernel options"
611 bool "High memory support"
614 source kernel/Kconfig.hz
615 source kernel/Kconfig.preempt
616 source "fs/Kconfig.binfmt"
618 # We optimistically allocate largepages from the VM, so make the limit
619 # large enough (16MB). This badly named config option is actually
621 config FORCE_MAX_ZONEORDER
624 default "9" if PPC_64K_PAGES
627 config MATH_EMULATION
628 bool "Math emulation"
629 depends on 4xx || 8xx || E200 || E500
631 Some PowerPC chips designed for embedded applications do not have
632 a floating-point unit and therefore do not implement the
633 floating-point instructions in the PowerPC instruction set. If you
634 say Y here, the kernel will include code to emulate a floating-point
635 unit, which will allow programs that use floating-point
639 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
640 depends on EXPERIMENTAL && PPC64
643 Cause IO segments sent to a device for DMA to be merged virtually
644 by the IOMMU when they happen to have been allocated contiguously.
645 This doesn't add pressure to the IOMMU allocator. However, some
646 drivers don't support getting large merged segments coming back
647 from *_map_sg(). Say Y if you know the drivers you are using are
648 properly handling this case.
651 bool "Support for enabling/disabling CPUs"
652 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
654 Say Y here to be able to disable and re-enable individual
655 CPUs at runtime on SMP machines.
657 Say N if you are unsure.
659 config ARCH_ENABLE_MEMORY_HOTPLUG
663 bool "kexec system call (EXPERIMENTAL)"
664 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
666 kexec is a system call that implements the ability to shutdown your
667 current kernel, and to start another kernel. It is like a reboot
668 but it is independent of the system firmware. And like a reboot
669 you can start any kernel with it, not just Linux.
671 The name comes from the similarity to the exec system call.
673 It is an ongoing process to be certain the hardware in a machine
674 is properly shutdown, so do not be surprised if this code does not
675 initially work for you. It may help to enable device hotplugging
676 support. As of this writing the exact hardware interface is
677 strongly in flux, so no good recommendation can be made.
680 bool "Build a kdump crash kernel (EXPERIMENTAL)"
681 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
683 Build a kernel suitable for use as a kdump capture kernel.
684 The kernel will be linked at a different address than normal, and
685 so can only be used for Kdump.
687 Don't change this unless you know what you are doing.
691 depends on 8xx || 8260
695 bool "PC PS/2 style Keyboard"
696 depends on 4xx || CPM2
699 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
700 default y if PPC_PREP
703 bool "Distribute interrupts on all CPUs by default"
704 depends on SMP && !MV64360
706 This option gives the kernel permission to distribute IRQs across
707 multiple CPUs. Saying N here will route all IRQs to the first
708 CPU. Generally saying Y is safe, although some problems have been
709 reported with SMP Power Macintoshes with this option enabled.
711 source "arch/powerpc/platforms/pseries/Kconfig"
716 default y if SMP && PPC_PSERIES
721 depends on NEED_MULTIPLE_NODES
723 config ARCH_SELECT_MEMORY_MODEL
727 config ARCH_FLATMEM_ENABLE
729 depends on (PPC64 && !NUMA) || PPC32
731 config ARCH_SPARSEMEM_ENABLE
735 config ARCH_SPARSEMEM_DEFAULT
737 depends on SMP && PPC_PSERIES
739 config ARCH_POPULATES_NODE_MAP
744 config ARCH_MEMORY_PROBE
746 depends on MEMORY_HOTPLUG
752 This option changes the kernel logical page size to 64k. On machines
753 without processor support for 64k pages, the kernel will simulate
754 them by loading each individual 4k page on demand transparently,
755 while on hardware with such support, it will be used to map
756 normal application pages.
759 bool "SMT (Hyperthreading) scheduler support"
760 depends on PPC64 && SMP
762 SMT scheduler support improves the CPU scheduler's decision making
763 when dealing with POWER5 cpus at a cost of slightly increased
764 overhead in some places. If unsure say N here.
766 config PROC_DEVICETREE
767 bool "Support for device tree in /proc"
770 This option adds a device-tree directory under /proc which contains
771 an image of the device tree that the kernel copies from Open
772 Firmware or other boot firmware. If unsure, say Y here.
774 source "arch/powerpc/platforms/prep/Kconfig"
777 bool "Default bootloader kernel arguments"
778 depends on !PPC_ISERIES
781 string "Initial kernel command string"
782 depends on CMDLINE_BOOL
783 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
785 On some platforms, there is currently no way for the boot loader to
786 pass arguments to the kernel. For these platforms, you can supply
787 some command-line options at build time by entering them here. In
788 most cases you will need to specify the root device here.
791 source kernel/power/Kconfig
795 bool "Enable seccomp to safely compute untrusted bytecode"
799 This kernel feature is useful for number crunching applications
800 that may need to compute untrusted bytecode during their
801 execution. By using pipes or other transports made available to
802 the process as file descriptors supporting the read/write
803 syscalls, it's possible to isolate those applications in
804 their own address space using seccomp. Once seccomp is
805 enabled via /proc/<pid>/seccomp, it cannot be disabled
806 and the task is only allowed to execute a few safe syscalls
807 defined by each seccomp mode.
809 If unsure, say Y. Only embedded should say N here.
820 bool "Support for ISA-bus hardware"
821 depends on PPC_PREP || PPC_CHRP
824 Find out whether you have ISA slots on your motherboard. ISA is the
825 name of a bus system, i.e. the way the CPU talks to the other stuff
826 inside your box. If you have an Apple machine, say N here; if you
827 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
828 you have an embedded board, consult your board documentation.
830 config GENERIC_ISA_DMA
832 depends on PPC64 || POWER4 || 6xx && !CPM2
847 config PPC_INDIRECT_PCI
850 default y if 40x || 44x
862 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
867 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
868 || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) || MPC7448HPC2
869 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
870 && !PPC_85xx && !PPC_86xx
871 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
872 default PCI_QSPAN if !4xx && !CPM2 && 8xx
874 Find out whether your system includes a PCI bus. PCI is the name of
875 a bus system, i.e. the way the CPU talks to the other stuff inside
876 your box. If you say Y here, the kernel will include drivers and
877 infrastructure code to support PCI bus devices.
885 depends on !4xx && !CPM2 && 8xx
888 Say Y here if you have a system based on a Motorola 8xx-series
889 embedded processor with a QSPAN PCI interface, otherwise say N.
893 depends on PCI && 8260
894 select PPC_INDIRECT_PCI
898 bool "Enable workaround for MPC826x erratum PCI 9"
899 depends on PCI_8260 && !ADS8272
903 prompt "IDMA channel for PCI 9 workaround"
906 config 8260_PCI9_IDMA1
909 config 8260_PCI9_IDMA2
912 config 8260_PCI9_IDMA3
915 config 8260_PCI9_IDMA4
920 source "drivers/pci/pcie/Kconfig"
922 source "drivers/pci/Kconfig"
924 source "drivers/pcmcia/Kconfig"
926 source "drivers/pci/hotplug/Kconfig"
930 menu "Advanced setup"
933 config ADVANCED_OPTIONS
934 bool "Prompt for advanced kernel configuration options"
936 This option will enable prompting for a variety of advanced kernel
937 configuration options. These options can cause the kernel to not
938 work if they are set incorrectly, but can be used to optimize certain
939 aspects of kernel memory management.
941 Unless you know what you are doing, say N here.
943 comment "Default settings for advanced configuration options are used"
944 depends on !ADVANCED_OPTIONS
946 config HIGHMEM_START_BOOL
947 bool "Set high memory pool address"
948 depends on ADVANCED_OPTIONS && HIGHMEM
950 This option allows you to set the base address of the kernel virtual
951 area used to map high memory pages. This can be useful in
952 optimizing the layout of kernel virtual memory.
954 Say N here unless you know what you are doing.
957 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
960 config LOWMEM_SIZE_BOOL
961 bool "Set maximum low memory"
962 depends on ADVANCED_OPTIONS
964 This option allows you to set the maximum amount of memory which
965 will be used as "low memory", that is, memory which the kernel can
966 access directly, without having to set up a kernel virtual mapping.
967 This can be useful in optimizing the layout of kernel virtual
970 Say N here unless you know what you are doing.
973 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
976 config KERNEL_START_BOOL
977 bool "Set custom kernel base address"
978 depends on ADVANCED_OPTIONS
980 This option allows you to set the kernel virtual address at which
981 the kernel will map low memory (the kernel image will be linked at
982 this address). This can be useful in optimizing the virtual memory
983 layout of the system.
985 Say N here unless you know what you are doing.
988 hex "Virtual address of kernel base" if KERNEL_START_BOOL
991 config TASK_SIZE_BOOL
992 bool "Set custom user task size"
993 depends on ADVANCED_OPTIONS
995 This option allows you to set the amount of virtual address space
996 allocated to user tasks. This can be useful in optimizing the
997 virtual memory layout of the system.
999 Say N here unless you know what you are doing.
1002 hex "Size of user task space" if TASK_SIZE_BOOL
1003 default "0x80000000"
1005 config CONSISTENT_START_BOOL
1006 bool "Set custom consistent memory pool address"
1007 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1009 This option allows you to set the base virtual address
1010 of the consistent memory pool. This pool of virtual
1011 memory is used to make consistent memory allocations.
1013 config CONSISTENT_START
1014 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
1015 default "0xff100000" if NOT_COHERENT_CACHE
1017 config CONSISTENT_SIZE_BOOL
1018 bool "Set custom consistent memory pool size"
1019 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1021 This option allows you to set the size of the
1022 consistent memory pool. This pool of virtual memory
1023 is used to make consistent memory allocations.
1025 config CONSISTENT_SIZE
1026 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1027 default "0x00200000" if NOT_COHERENT_CACHE
1029 config BOOT_LOAD_BOOL
1030 bool "Set the boot link/load address"
1031 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1033 This option allows you to set the initial load address of the zImage
1034 or zImage.initrd file. This can be useful if you are on a board
1035 which has a small amount of memory.
1037 Say N here unless you know what you are doing.
1040 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1041 default "0x00400000" if 40x || 8xx || 8260
1042 default "0x01000000" if 44x
1043 default "0x00800000"
1046 bool "Pinned Kernel TLBs (860 ONLY)"
1047 depends on ADVANCED_OPTIONS && 8xx
1053 default "0xc000000000000000"
1056 source "net/Kconfig"
1058 source "drivers/Kconfig"
1062 # XXX source "arch/ppc/8xx_io/Kconfig"
1064 # XXX source "arch/ppc/8260_io/Kconfig"
1066 source "arch/powerpc/sysdev/qe_lib/Kconfig"
1068 source "arch/powerpc/platforms/iseries/Kconfig"
1070 source "lib/Kconfig"
1072 menu "Instrumentation Support"
1073 depends on EXPERIMENTAL
1075 source "arch/powerpc/oprofile/Kconfig"
1078 bool "Kprobes (EXPERIMENTAL)"
1079 depends on PPC64 && KALLSYMS && EXPERIMENTAL && MODULES
1081 Kprobes allows you to trap at almost any kernel address and
1082 execute a callback function. register_kprobe() establishes
1083 a probepoint and specifies the callback. Kprobes is useful
1084 for kernel debugging, non-intrusive instrumentation and testing.
1085 If in doubt, say "N".
1088 source "arch/powerpc/Kconfig.debug"
1090 source "security/Kconfig"
1094 depends on COMPAT && KEYS
1097 source "crypto/Kconfig"