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 "IBM Legacy iSeries"
346 bool "Embedded 6xx/7xx/7xxx-based board"
347 depends on PPC32 && (BROKEN||BROKEN_ON_SMP)
351 depends on PPC32 && BROKEN
353 Select APUS if configuring for a PowerUP Amiga.
354 More information is available at:
355 <http://linux-apus.sourceforge.net/>.
359 depends on PPC_MULTIPLATFORM && PPC64
360 bool "IBM pSeries & new (POWER5-based) iSeries"
364 select RTAS_ERROR_LOGGING
365 select PPC_UDBG_16550
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/82xx/Kconfig
598 source arch/powerpc/platforms/83xx/Kconfig
599 source arch/powerpc/platforms/85xx/Kconfig
600 source arch/powerpc/platforms/86xx/Kconfig
601 source arch/powerpc/platforms/8xx/Kconfig
602 source arch/powerpc/platforms/cell/Kconfig
604 menu "Kernel options"
607 bool "High memory support"
610 source kernel/Kconfig.hz
611 source kernel/Kconfig.preempt
612 source "fs/Kconfig.binfmt"
614 # We optimistically allocate largepages from the VM, so make the limit
615 # large enough (16MB). This badly named config option is actually
617 config FORCE_MAX_ZONEORDER
620 default "9" if PPC_64K_PAGES
623 config MATH_EMULATION
624 bool "Math emulation"
625 depends on 4xx || 8xx || E200 || E500
627 Some PowerPC chips designed for embedded applications do not have
628 a floating-point unit and therefore do not implement the
629 floating-point instructions in the PowerPC instruction set. If you
630 say Y here, the kernel will include code to emulate a floating-point
631 unit, which will allow programs that use floating-point
635 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
636 depends on EXPERIMENTAL && PPC64
639 Cause IO segments sent to a device for DMA to be merged virtually
640 by the IOMMU when they happen to have been allocated contiguously.
641 This doesn't add pressure to the IOMMU allocator. However, some
642 drivers don't support getting large merged segments coming back
643 from *_map_sg(). Say Y if you know the drivers you are using are
644 properly handling this case.
647 bool "Support for enabling/disabling CPUs"
648 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
650 Say Y here to be able to disable and re-enable individual
651 CPUs at runtime on SMP machines.
653 Say N if you are unsure.
655 config ARCH_ENABLE_MEMORY_HOTPLUG
659 bool "kexec system call (EXPERIMENTAL)"
660 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
662 kexec is a system call that implements the ability to shutdown your
663 current kernel, and to start another kernel. It is like a reboot
664 but it is independent of the system firmware. And like a reboot
665 you can start any kernel with it, not just Linux.
667 The name comes from the similarity to the exec system call.
669 It is an ongoing process to be certain the hardware in a machine
670 is properly shutdown, so do not be surprised if this code does not
671 initially work for you. It may help to enable device hotplugging
672 support. As of this writing the exact hardware interface is
673 strongly in flux, so no good recommendation can be made.
676 bool "Build a kdump crash kernel (EXPERIMENTAL)"
677 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
679 Build a kernel suitable for use as a kdump capture kernel.
680 The kernel will be linked at a different address than normal, and
681 so can only be used for Kdump.
683 Don't change this unless you know what you are doing.
687 depends on 8xx || 8260
691 bool "PC PS/2 style Keyboard"
692 depends on 4xx || CPM2
695 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
696 default y if PPC_PREP
699 bool "Distribute interrupts on all CPUs by default"
700 depends on SMP && !MV64360
702 This option gives the kernel permission to distribute IRQs across
703 multiple CPUs. Saying N here will route all IRQs to the first
704 CPU. Generally saying Y is safe, although some problems have been
705 reported with SMP Power Macintoshes with this option enabled.
707 source "arch/powerpc/platforms/pseries/Kconfig"
712 default y if SMP && PPC_PSERIES
717 depends on NEED_MULTIPLE_NODES
719 config ARCH_SELECT_MEMORY_MODEL
723 config ARCH_FLATMEM_ENABLE
725 depends on (PPC64 && !NUMA) || PPC32
727 config ARCH_SPARSEMEM_ENABLE
731 config ARCH_SPARSEMEM_DEFAULT
733 depends on SMP && PPC_PSERIES
737 config HAVE_ARCH_EARLY_PFN_TO_NID
739 depends on NEED_MULTIPLE_NODES
741 config ARCH_MEMORY_PROBE
743 depends on MEMORY_HOTPLUG
749 This option changes the kernel logical page size to 64k. On machines
750 without processor support for 64k pages, the kernel will simulate
751 them by loading each individual 4k page on demand transparently,
752 while on hardware with such support, it will be used to map
753 normal application pages.
756 bool "SMT (Hyperthreading) scheduler support"
757 depends on PPC64 && SMP
759 SMT scheduler support improves the CPU scheduler's decision making
760 when dealing with POWER5 cpus at a cost of slightly increased
761 overhead in some places. If unsure say N here.
763 config PROC_DEVICETREE
764 bool "Support for device tree in /proc"
767 This option adds a device-tree directory under /proc which contains
768 an image of the device tree that the kernel copies from Open
769 Firmware or other boot firmware. If unsure, say Y here.
771 source "arch/powerpc/platforms/prep/Kconfig"
774 bool "Default bootloader kernel arguments"
775 depends on !PPC_ISERIES
778 string "Initial kernel command string"
779 depends on CMDLINE_BOOL
780 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
782 On some platforms, there is currently no way for the boot loader to
783 pass arguments to the kernel. For these platforms, you can supply
784 some command-line options at build time by entering them here. In
785 most cases you will need to specify the root device here.
788 source kernel/power/Kconfig
792 bool "Enable seccomp to safely compute untrusted bytecode"
796 This kernel feature is useful for number crunching applications
797 that may need to compute untrusted bytecode during their
798 execution. By using pipes or other transports made available to
799 the process as file descriptors supporting the read/write
800 syscalls, it's possible to isolate those applications in
801 their own address space using seccomp. Once seccomp is
802 enabled via /proc/<pid>/seccomp, it cannot be disabled
803 and the task is only allowed to execute a few safe syscalls
804 defined by each seccomp mode.
806 If unsure, say Y. Only embedded should say N here.
817 bool "Support for ISA-bus hardware"
818 depends on PPC_PREP || PPC_CHRP
821 Find out whether you have ISA slots on your motherboard. ISA is the
822 name of a bus system, i.e. the way the CPU talks to the other stuff
823 inside your box. If you have an Apple machine, say N here; if you
824 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
825 you have an embedded board, consult your board documentation.
827 config GENERIC_ISA_DMA
829 depends on PPC64 || POWER4 || 6xx && !CPM2
844 config PPC_INDIRECT_PCI
847 default y if 40x || 44x
859 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
864 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
865 || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) || MPC7448HPC2
866 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
867 && !PPC_85xx && !PPC_86xx
868 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
869 default PCI_QSPAN if !4xx && !CPM2 && 8xx
871 Find out whether your system includes a PCI bus. PCI is the name of
872 a bus system, i.e. the way the CPU talks to the other stuff inside
873 your box. If you say Y here, the kernel will include drivers and
874 infrastructure code to support PCI bus devices.
882 depends on !4xx && !CPM2 && 8xx
885 Say Y here if you have a system based on a Motorola 8xx-series
886 embedded processor with a QSPAN PCI interface, otherwise say N.
890 depends on PCI && 8260
891 select PPC_INDIRECT_PCI
895 bool "Enable workaround for MPC826x erratum PCI 9"
896 depends on PCI_8260 && !ADS8272
900 prompt "IDMA channel for PCI 9 workaround"
903 config 8260_PCI9_IDMA1
906 config 8260_PCI9_IDMA2
909 config 8260_PCI9_IDMA3
912 config 8260_PCI9_IDMA4
917 source "drivers/pci/pcie/Kconfig"
919 source "drivers/pci/Kconfig"
921 source "drivers/pcmcia/Kconfig"
923 source "drivers/pci/hotplug/Kconfig"
927 menu "Advanced setup"
930 config ADVANCED_OPTIONS
931 bool "Prompt for advanced kernel configuration options"
933 This option will enable prompting for a variety of advanced kernel
934 configuration options. These options can cause the kernel to not
935 work if they are set incorrectly, but can be used to optimize certain
936 aspects of kernel memory management.
938 Unless you know what you are doing, say N here.
940 comment "Default settings for advanced configuration options are used"
941 depends on !ADVANCED_OPTIONS
943 config HIGHMEM_START_BOOL
944 bool "Set high memory pool address"
945 depends on ADVANCED_OPTIONS && HIGHMEM
947 This option allows you to set the base address of the kernel virtual
948 area used to map high memory pages. This can be useful in
949 optimizing the layout of kernel virtual memory.
951 Say N here unless you know what you are doing.
954 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
957 config LOWMEM_SIZE_BOOL
958 bool "Set maximum low memory"
959 depends on ADVANCED_OPTIONS
961 This option allows you to set the maximum amount of memory which
962 will be used as "low memory", that is, memory which the kernel can
963 access directly, without having to set up a kernel virtual mapping.
964 This can be useful in optimizing the layout of kernel virtual
967 Say N here unless you know what you are doing.
970 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
973 config KERNEL_START_BOOL
974 bool "Set custom kernel base address"
975 depends on ADVANCED_OPTIONS
977 This option allows you to set the kernel virtual address at which
978 the kernel will map low memory (the kernel image will be linked at
979 this address). This can be useful in optimizing the virtual memory
980 layout of the system.
982 Say N here unless you know what you are doing.
985 hex "Virtual address of kernel base" if KERNEL_START_BOOL
988 config TASK_SIZE_BOOL
989 bool "Set custom user task size"
990 depends on ADVANCED_OPTIONS
992 This option allows you to set the amount of virtual address space
993 allocated to user tasks. This can be useful in optimizing the
994 virtual memory layout of the system.
996 Say N here unless you know what you are doing.
999 hex "Size of user task space" if TASK_SIZE_BOOL
1000 default "0x80000000"
1002 config CONSISTENT_START_BOOL
1003 bool "Set custom consistent memory pool address"
1004 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1006 This option allows you to set the base virtual address
1007 of the the consistent memory pool. This pool of virtual
1008 memory is used to make consistent memory allocations.
1010 config CONSISTENT_START
1011 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
1012 default "0xff100000" if NOT_COHERENT_CACHE
1014 config CONSISTENT_SIZE_BOOL
1015 bool "Set custom consistent memory pool size"
1016 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1018 This option allows you to set the size of the the
1019 consistent memory pool. This pool of virtual memory
1020 is used to make consistent memory allocations.
1022 config CONSISTENT_SIZE
1023 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1024 default "0x00200000" if NOT_COHERENT_CACHE
1026 config BOOT_LOAD_BOOL
1027 bool "Set the boot link/load address"
1028 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1030 This option allows you to set the initial load address of the zImage
1031 or zImage.initrd file. This can be useful if you are on a board
1032 which has a small amount of memory.
1034 Say N here unless you know what you are doing.
1037 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1038 default "0x00400000" if 40x || 8xx || 8260
1039 default "0x01000000" if 44x
1040 default "0x00800000"
1043 bool "Pinned Kernel TLBs (860 ONLY)"
1044 depends on ADVANCED_OPTIONS && 8xx
1050 default "0xc000000000000000"
1053 source "net/Kconfig"
1055 source "drivers/Kconfig"
1059 # XXX source "arch/ppc/8xx_io/Kconfig"
1061 # XXX source "arch/ppc/8260_io/Kconfig"
1063 source "arch/powerpc/platforms/iseries/Kconfig"
1065 source "lib/Kconfig"
1067 menu "Instrumentation Support"
1068 depends on EXPERIMENTAL
1070 source "arch/powerpc/oprofile/Kconfig"
1073 bool "Kprobes (EXPERIMENTAL)"
1074 depends on PPC64 && EXPERIMENTAL && MODULES
1076 Kprobes allows you to trap at almost any kernel address and
1077 execute a callback function. register_kprobe() establishes
1078 a probepoint and specifies the callback. Kprobes is useful
1079 for kernel debugging, non-intrusive instrumentation and testing.
1080 If in doubt, say "N".
1083 source "arch/powerpc/Kconfig.debug"
1085 source "security/Kconfig"
1089 depends on COMPAT && KEYS
1092 source "crypto/Kconfig"