1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
5 mainmenu "Linux/PowerPC Kernel Configuration"
11 This option selects whether a 32-bit or a 64-bit kernel
29 config GENERIC_HARDIRQS
33 config RWSEM_GENERIC_SPINLOCK
36 config RWSEM_XCHGADD_ALGORITHM
40 config GENERIC_HWEIGHT
44 config GENERIC_CALIBRATE_DELAY
48 config GENERIC_FIND_NEXT_BIT
66 depends on COMPAT && SYSVIPC
69 # All PPC32s use generic nvram driver through ppc_md
74 config SCHED_NO_NO_OMIT_FRAME_POINTER
78 config ARCH_MAY_HAVE_PC_FDC
91 default y if PPC32 && SMP
97 Used to allow a board to specify it wants a uImage built by default
100 menu "Processor support"
102 prompt "Processor Type"
111 There are four families of PowerPC chips supported. The more common
112 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
113 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
114 embedded versions (403 and 405) and the high end 64 bit Power
115 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
117 Unless you are building a kernel for one of the embedded processor
118 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
119 Note that the kernel runs in 32-bit mode even on 64-bit chips.
122 bool "Freescale 52xx"
127 bool "Freescale 82xx"
132 bool "Freescale 83xx"
139 bool "Freescale 85xx"
145 bool "Freescale 86xx"
151 The Freescale E600 SoCs have 74xx cores.
163 bool "Freescale e200"
168 bool "Optimize for POWER4"
172 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
173 The resulting binary will not work on POWER3 or RS64 processors
174 when compiled with binutils 2.15 or later.
179 default y if !POWER4_ONLY
188 # this is temp to handle compat with arch=ppc
192 # this is temp to handle compat with arch=ppc
205 depends on E200 || E500
210 depends on E200 || E500
215 depends on 44x || E500
217 default y if E500 && PHYS_64BIT
220 bool 'Large physical address support' if E500
221 depends on 44x || E500
224 This option enables kernel support for larger than 32-bit physical
225 addresses. This features is not be available on all e500 cores.
227 If in doubt, say N here.
230 bool "AltiVec Support"
231 depends on CLASSIC32 || POWER4
233 This option enables kernel support for the Altivec extensions to the
234 PowerPC processor. The kernel currently supports saving and restoring
235 altivec registers, and turning on the 'altivec enable' bit so user
236 processes can execute altivec instructions.
238 This option is only usefully if you have a processor that supports
239 altivec (G4, otherwise known as 74xx series), but does not have
240 any affect on a non-altivec cpu (it does, however add code to the
243 If in doubt, say Y here.
247 depends on E200 || E500
250 This option enables kernel support for the Signal Processing
251 Extensions (SPE) to the PowerPC processor. The kernel currently
252 supports saving and restoring SPE registers, and turning on the
253 'spe enable' bit so user processes can execute SPE instructions.
255 This option is only useful if you have a processor that supports
256 SPE (e500, otherwise known as 85xx series), but does not have any
257 effect on a non-spe cpu (it does, however add code to the kernel).
259 If in doubt, say Y here.
263 depends on 6xx || POWER3 || POWER4 || PPC64
266 config PPC_STD_MMU_32
268 depends on PPC_STD_MMU && PPC32
270 config VIRT_CPU_ACCOUNTING
271 bool "Deterministic task and CPU time accounting"
275 Select this option to enable more accurate task and CPU time
276 accounting. This is done by reading a CPU counter on each
277 kernel entry and exit and on transitions within the kernel
278 between system, softirq and hardirq state, so there is a
279 small performance impact. This also enables accounting of
280 stolen time on logically-partitioned systems running on
281 IBM POWER5-based machines.
283 If in doubt, say Y here.
286 depends on PPC_STD_MMU
287 bool "Symmetric multi-processing support"
289 This enables support for systems with more than one CPU. If you have
290 a system with only one CPU, say N. If you have a system with more
291 than one CPU, say Y. Note that the kernel does not currently
292 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
293 since they have inadequate hardware support for multiprocessor
296 If you say N here, the kernel will run on single and multiprocessor
297 machines, but will use only one CPU of a multiprocessor machine. If
298 you say Y here, the kernel will run on single-processor machines.
299 On a single-processor machine, the kernel will run faster if you say
302 If you don't know what to do here, say N.
305 int "Maximum number of CPUs (2-128)"
308 default "32" if PPC64
311 config NOT_COHERENT_CACHE
313 depends on 4xx || 8xx || E200
317 source "init/Kconfig"
319 menu "Platform support"
320 depends on PPC64 || CLASSIC32
323 prompt "Machine type"
324 default PPC_MULTIPLATFORM
326 config PPC_MULTIPLATFORM
327 bool "Generic desktop/server/laptop"
329 Select this option if configuring for an IBM pSeries or
330 RS/6000 machine, an Apple machine, or a PReP, CHRP,
331 Maple or Cell-based machine.
334 bool "IBM Legacy iSeries"
338 bool "Embedded 6xx/7xx/7xxx-based board"
339 depends on PPC32 && BROKEN
343 depends on PPC32 && BROKEN
345 Select APUS if configuring for a PowerUP Amiga.
346 More information is available at:
347 <http://linux-apus.sourceforge.net/>.
351 depends on PPC_MULTIPLATFORM && PPC64
352 bool "IBM pSeries & new (POWER5-based) iSeries"
355 select RTAS_ERROR_LOGGING
356 select PPC_UDBG_16550
360 bool "Common Hardware Reference Platform (CHRP) based machines"
361 depends on PPC_MULTIPLATFORM && PPC32
363 select PPC_INDIRECT_PCI
366 select PPC_UDBG_16550
370 bool "Apple PowerMac based machines"
371 depends on PPC_MULTIPLATFORM
372 select PPC_INDIRECT_PCI if PPC32
373 select PPC_MPC106 if PPC32
378 depends on PPC_PMAC && POWER4
380 select MPIC_BROKEN_U3
381 select GENERIC_TBSYNC
386 bool "PowerPC Reference Platform (PReP) based machines"
387 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
389 select PPC_INDIRECT_PCI
390 select PPC_UDBG_16550
394 depends on PPC_MULTIPLATFORM && PPC64
395 bool "Maple 970FX Evaluation Board"
397 select MPIC_BROKEN_U3
398 select GENERIC_TBSYNC
399 select PPC_UDBG_16550
403 This option enables support for the Maple 970FX Evaluation Board.
404 For more informations, refer to <http://www.970eval.com>
410 config PPC_CELL_NATIVE
415 config PPC_IBM_CELL_BLADE
416 bool " IBM Cell Blade"
417 depends on PPC_MULTIPLATFORM && PPC64
418 select PPC_CELL_NATIVE
421 select PPC_UDBG_16550
423 config UDBG_RTAS_CONSOLE
428 depends on PPC_PSERIES
434 depends on PPC_MULTIPLATFORM && PPC64
438 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
446 config RTAS_ERROR_LOGGING
452 bool "Proc interface to RTAS"
457 tristate "Firmware flash interface"
458 depends on PPC64 && RTAS_PROC
464 config MPIC_BROKEN_U3
470 depends on PPC_PSERIES || PPC_ISERIES
475 depends on PPC_PSERIES
476 bool "Support for GX bus based adapters"
478 Bus device driver for GX bus based adapters.
488 source "drivers/cpufreq/Kconfig"
491 bool "Support for Apple PowerBooks"
492 depends on CPU_FREQ && ADB_PMU && PPC32
493 select CPU_FREQ_TABLE
495 This adds support for frequency switching on Apple PowerBooks,
496 this currently includes some models of iBook & Titanium
499 config CPU_FREQ_PMAC64
500 bool "Support for some Apple G5s"
501 depends on CPU_FREQ && PMAC_SMU && PPC64
502 select CPU_FREQ_TABLE
504 This adds support for frequency switching on Apple iMac G5,
505 and some of the more recent desktop G5 machines as well.
507 config PPC601_SYNC_FIX
508 bool "Workarounds for PPC601 bugs"
509 depends on 6xx && (PPC_PREP || PPC_PMAC)
511 Some versions of the PPC601 (the first PowerPC chip) have bugs which
512 mean that extra synchronization instructions are required near
513 certain instructions, typically those that make major changes to the
514 CPU state. These extra instructions reduce performance slightly.
515 If you say N here, these extra instructions will not be included,
516 resulting in a kernel which will run faster but may not run at all
517 on some systems with the PPC601 chip.
519 If in doubt, say Y here.
522 bool "On-chip CPU temperature sensor support"
525 G3 and G4 processors have an on-chip temperature sensor called the
526 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
527 temperature within 2-4 degrees Celsius. This option shows the current
528 on-die temperature in /proc/cpuinfo if the cpu supports it.
530 Unfortunately, on some chip revisions, this sensor is very inaccurate
531 and in many cases, does not work at all, so don't assume the cpu
532 temp is actually what /proc/cpuinfo says it is.
535 bool "Interrupt driven TAU driver (DANGEROUS)"
538 The TAU supports an interrupt driven mode which causes an interrupt
539 whenever the temperature goes out of range. This is the fastest way
540 to get notified the temp has exceeded a range. With this option off,
541 a timer is used to re-check the temperature periodically.
543 However, on some cpus it appears that the TAU interrupt hardware
544 is buggy and can cause a situation which would lead unexplained hard
547 Unless you are extending the TAU driver, or enjoy kernel/hardware
548 debugging, leave this option off.
551 bool "Average high and low temp"
554 The TAU hardware can compare the temperature to an upper and lower
555 bound. The default behavior is to show both the upper and lower
556 bound in /proc/cpuinfo. If the range is large, the temperature is
557 either changing a lot, or the TAU hardware is broken (likely on some
558 G4's). If the range is small (around 4 degrees), the temperature is
559 relatively stable. If you say Y here, a single temperature value,
560 halfway between the upper and lower bounds, will be reported in
563 If in doubt, say N here.
566 source arch/powerpc/platforms/embedded6xx/Kconfig
567 source arch/powerpc/platforms/4xx/Kconfig
568 source arch/powerpc/platforms/83xx/Kconfig
569 source arch/powerpc/platforms/85xx/Kconfig
570 source arch/powerpc/platforms/86xx/Kconfig
571 source arch/powerpc/platforms/8xx/Kconfig
572 source arch/powerpc/platforms/cell/Kconfig
574 menu "Kernel options"
577 bool "High memory support"
580 source kernel/Kconfig.hz
581 source kernel/Kconfig.preempt
582 source "fs/Kconfig.binfmt"
584 # We optimistically allocate largepages from the VM, so make the limit
585 # large enough (16MB). This badly named config option is actually
587 config FORCE_MAX_ZONEORDER
590 default "9" if PPC_64K_PAGES
593 config MATH_EMULATION
594 bool "Math emulation"
595 depends on 4xx || 8xx || E200 || E500
597 Some PowerPC chips designed for embedded applications do not have
598 a floating-point unit and therefore do not implement the
599 floating-point instructions in the PowerPC instruction set. If you
600 say Y here, the kernel will include code to emulate a floating-point
601 unit, which will allow programs that use floating-point
605 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
606 depends on EXPERIMENTAL && PPC64
609 Cause IO segments sent to a device for DMA to be merged virtually
610 by the IOMMU when they happen to have been allocated contiguously.
611 This doesn't add pressure to the IOMMU allocator. However, some
612 drivers don't support getting large merged segments coming back
613 from *_map_sg(). Say Y if you know the drivers you are using are
614 properly handling this case.
617 bool "Support for enabling/disabling CPUs"
618 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
620 Say Y here to be able to disable and re-enable individual
621 CPUs at runtime on SMP machines.
623 Say N if you are unsure.
626 bool "kexec system call (EXPERIMENTAL)"
627 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
629 kexec is a system call that implements the ability to shutdown your
630 current kernel, and to start another kernel. It is like a reboot
631 but it is indepedent of the system firmware. And like a reboot
632 you can start any kernel with it, not just Linux.
634 The name comes from the similiarity to the exec system call.
636 It is an ongoing process to be certain the hardware in a machine
637 is properly shutdown, so do not be surprised if this code does not
638 initially work for you. It may help to enable device hotplugging
639 support. As of this writing the exact hardware interface is
640 strongly in flux, so no good recommendation can be made.
643 bool "Build a kdump crash kernel (EXPERIMENTAL)"
644 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
646 Build a kernel suitable for use as a kdump capture kernel.
647 The kernel will be linked at a different address than normal, and
648 so can only be used for Kdump.
650 Don't change this unless you know what you are doing.
654 depends on 8xx || 8260
658 bool "PC PS/2 style Keyboard"
659 depends on 4xx || CPM2
662 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
663 default y if PPC_PREP
666 bool "Distribute interrupts on all CPUs by default"
667 depends on SMP && !MV64360
669 This option gives the kernel permission to distribute IRQs across
670 multiple CPUs. Saying N here will route all IRQs to the first
671 CPU. Generally saying Y is safe, although some problems have been
672 reported with SMP Power Macintoshes with this option enabled.
674 source "arch/powerpc/platforms/pseries/Kconfig"
679 default y if SMP && PPC_PSERIES
684 depends on NEED_MULTIPLE_NODES
686 config ARCH_SELECT_MEMORY_MODEL
690 config ARCH_FLATMEM_ENABLE
692 depends on (PPC64 && !NUMA) || PPC32
694 config ARCH_SPARSEMEM_ENABLE
698 config ARCH_SPARSEMEM_DEFAULT
700 depends on SMP && PPC_PSERIES
704 config HAVE_ARCH_EARLY_PFN_TO_NID
706 depends on NEED_MULTIPLE_NODES
708 config ARCH_MEMORY_PROBE
710 depends on MEMORY_HOTPLUG
716 This option changes the kernel logical page size to 64k. On machines
717 without processor support for 64k pages, the kernel will simulate
718 them by loading each individual 4k page on demand transparently,
719 while on hardware with such support, it will be used to map
720 normal application pages.
723 bool "SMT (Hyperthreading) scheduler support"
724 depends on PPC64 && SMP
726 SMT scheduler support improves the CPU scheduler's decision making
727 when dealing with POWER5 cpus at a cost of slightly increased
728 overhead in some places. If unsure say N here.
730 config PROC_DEVICETREE
731 bool "Support for device tree in /proc"
734 This option adds a device-tree directory under /proc which contains
735 an image of the device tree that the kernel copies from Open
736 Firmware or other boot firmware. If unsure, say Y here.
738 source "arch/powerpc/platforms/prep/Kconfig"
741 bool "Default bootloader kernel arguments"
742 depends on !PPC_ISERIES
745 string "Initial kernel command string"
746 depends on CMDLINE_BOOL
747 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
749 On some platforms, there is currently no way for the boot loader to
750 pass arguments to the kernel. For these platforms, you can supply
751 some command-line options at build time by entering them here. In
752 most cases you will need to specify the root device here.
755 source kernel/power/Kconfig
759 bool "Enable seccomp to safely compute untrusted bytecode"
763 This kernel feature is useful for number crunching applications
764 that may need to compute untrusted bytecode during their
765 execution. By using pipes or other transports made available to
766 the process as file descriptors supporting the read/write
767 syscalls, it's possible to isolate those applications in
768 their own address space using seccomp. Once seccomp is
769 enabled via /proc/<pid>/seccomp, it cannot be disabled
770 and the task is only allowed to execute a few safe syscalls
771 defined by each seccomp mode.
773 If unsure, say Y. Only embedded should say N here.
784 bool "Support for ISA-bus hardware"
785 depends on PPC_PREP || PPC_CHRP
788 Find out whether you have ISA slots on your motherboard. ISA is the
789 name of a bus system, i.e. the way the CPU talks to the other stuff
790 inside your box. If you have an Apple machine, say N here; if you
791 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
792 you have an embedded board, consult your board documentation.
794 config GENERIC_ISA_DMA
796 depends on PPC64 || POWER4 || 6xx && !CPM2
803 config PPC_INDIRECT_PCI
806 default y if 40x || 44x
818 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
823 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
824 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
825 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
826 default PCI_QSPAN if !4xx && !CPM2 && 8xx
828 Find out whether your system includes a PCI bus. PCI is the name of
829 a bus system, i.e. the way the CPU talks to the other stuff inside
830 your box. If you say Y here, the kernel will include drivers and
831 infrastructure code to support PCI bus devices.
839 depends on !4xx && !CPM2 && 8xx
842 Say Y here if you have a system based on a Motorola 8xx-series
843 embedded processor with a QSPAN PCI interface, otherwise say N.
847 depends on PCI && 8260
848 select PPC_INDIRECT_PCI
852 bool "Enable workaround for MPC826x erratum PCI 9"
853 depends on PCI_8260 && !ADS8272
857 prompt "IDMA channel for PCI 9 workaround"
860 config 8260_PCI9_IDMA1
863 config 8260_PCI9_IDMA2
866 config 8260_PCI9_IDMA3
869 config 8260_PCI9_IDMA4
874 source "drivers/pci/pcie/Kconfig"
876 source "drivers/pci/Kconfig"
878 source "drivers/pcmcia/Kconfig"
880 source "drivers/pci/hotplug/Kconfig"
884 menu "Advanced setup"
887 config ADVANCED_OPTIONS
888 bool "Prompt for advanced kernel configuration options"
890 This option will enable prompting for a variety of advanced kernel
891 configuration options. These options can cause the kernel to not
892 work if they are set incorrectly, but can be used to optimize certain
893 aspects of kernel memory management.
895 Unless you know what you are doing, say N here.
897 comment "Default settings for advanced configuration options are used"
898 depends on !ADVANCED_OPTIONS
900 config HIGHMEM_START_BOOL
901 bool "Set high memory pool address"
902 depends on ADVANCED_OPTIONS && HIGHMEM
904 This option allows you to set the base address of the kernel virtual
905 area used to map high memory pages. This can be useful in
906 optimizing the layout of kernel virtual memory.
908 Say N here unless you know what you are doing.
911 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
914 config LOWMEM_SIZE_BOOL
915 bool "Set maximum low memory"
916 depends on ADVANCED_OPTIONS
918 This option allows you to set the maximum amount of memory which
919 will be used as "low memory", that is, memory which the kernel can
920 access directly, without having to set up a kernel virtual mapping.
921 This can be useful in optimizing the layout of kernel virtual
924 Say N here unless you know what you are doing.
927 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
930 config KERNEL_START_BOOL
931 bool "Set custom kernel base address"
932 depends on ADVANCED_OPTIONS
934 This option allows you to set the kernel virtual address at which
935 the kernel will map low memory (the kernel image will be linked at
936 this address). This can be useful in optimizing the virtual memory
937 layout of the system.
939 Say N here unless you know what you are doing.
942 hex "Virtual address of kernel base" if KERNEL_START_BOOL
945 config TASK_SIZE_BOOL
946 bool "Set custom user task size"
947 depends on ADVANCED_OPTIONS
949 This option allows you to set the amount of virtual address space
950 allocated to user tasks. This can be useful in optimizing the
951 virtual memory layout of the system.
953 Say N here unless you know what you are doing.
956 hex "Size of user task space" if TASK_SIZE_BOOL
959 config CONSISTENT_START_BOOL
960 bool "Set custom consistent memory pool address"
961 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
963 This option allows you to set the base virtual address
964 of the the consistent memory pool. This pool of virtual
965 memory is used to make consistent memory allocations.
967 config CONSISTENT_START
968 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
969 default "0xff100000" if NOT_COHERENT_CACHE
971 config CONSISTENT_SIZE_BOOL
972 bool "Set custom consistent memory pool size"
973 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
975 This option allows you to set the size of the the
976 consistent memory pool. This pool of virtual memory
977 is used to make consistent memory allocations.
979 config CONSISTENT_SIZE
980 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
981 default "0x00200000" if NOT_COHERENT_CACHE
983 config BOOT_LOAD_BOOL
984 bool "Set the boot link/load address"
985 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
987 This option allows you to set the initial load address of the zImage
988 or zImage.initrd file. This can be useful if you are on a board
989 which has a small amount of memory.
991 Say N here unless you know what you are doing.
994 hex "Link/load address for booting" if BOOT_LOAD_BOOL
995 default "0x00400000" if 40x || 8xx || 8260
996 default "0x01000000" if 44x
1000 bool "Pinned Kernel TLBs (860 ONLY)"
1001 depends on ADVANCED_OPTIONS && 8xx
1007 default "0xc000000000000000"
1010 source "net/Kconfig"
1012 source "drivers/Kconfig"
1016 # XXX source "arch/ppc/8xx_io/Kconfig"
1018 # XXX source "arch/ppc/8260_io/Kconfig"
1020 source "arch/powerpc/platforms/iseries/Kconfig"
1022 source "lib/Kconfig"
1024 menu "Instrumentation Support"
1025 depends on EXPERIMENTAL
1027 source "arch/powerpc/oprofile/Kconfig"
1030 bool "Kprobes (EXPERIMENTAL)"
1031 depends on PPC64 && EXPERIMENTAL && MODULES
1033 Kprobes allows you to trap at almost any kernel address and
1034 execute a callback function. register_kprobe() establishes
1035 a probepoint and specifies the callback. Kprobes is useful
1036 for kernel debugging, non-intrusive instrumentation and testing.
1037 If in doubt, say "N".
1040 source "arch/powerpc/Kconfig.debug"
1042 source "security/Kconfig"
1046 depends on COMPAT && KEYS
1049 source "crypto/Kconfig"