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
62 depends on COMPAT && SYSVIPC
65 # All PPC32s use generic nvram driver through ppc_md
70 config SCHED_NO_NO_OMIT_FRAME_POINTER
74 config ARCH_MAY_HAVE_PC_FDC
87 default y if PPC32 && SMP
93 Used to allow a board to specify it wants a uImage built by default
96 menu "Processor support"
98 prompt "Processor Type"
107 There are four families of PowerPC chips supported. The more common
108 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
109 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
110 embedded versions (403 and 405) and the high end 64 bit Power
111 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
113 Unless you are building a kernel for one of the embedded processor
114 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
115 Note that the kernel runs in 32-bit mode even on 64-bit chips.
118 bool "Freescale 52xx"
123 bool "Freescale 82xx"
128 bool "Freescale 83xx"
135 bool "Freescale 85xx"
150 bool "Freescale e200"
155 bool "Optimize for POWER4"
159 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
160 The resulting binary will not work on POWER3 or RS64 processors
161 when compiled with binutils 2.15 or later.
166 default y if !POWER4_ONLY
175 # this is temp to handle compat with arch=ppc
179 # this is temp to handle compat with arch=ppc
192 depends on E200 || E500
197 depends on E200 || E500
202 depends on 44x || E500
204 default y if E500 && PHYS_64BIT
207 bool 'Large physical address support' if E500
208 depends on 44x || E500
211 This option enables kernel support for larger than 32-bit physical
212 addresses. This features is not be available on all e500 cores.
214 If in doubt, say N here.
217 bool "AltiVec Support"
218 depends on CLASSIC32 || POWER4
220 This option enables kernel support for the Altivec extensions to the
221 PowerPC processor. The kernel currently supports saving and restoring
222 altivec registers, and turning on the 'altivec enable' bit so user
223 processes can execute altivec instructions.
225 This option is only usefully if you have a processor that supports
226 altivec (G4, otherwise known as 74xx series), but does not have
227 any affect on a non-altivec cpu (it does, however add code to the
230 If in doubt, say Y here.
234 depends on E200 || E500
237 This option enables kernel support for the Signal Processing
238 Extensions (SPE) to the PowerPC processor. The kernel currently
239 supports saving and restoring SPE registers, and turning on the
240 'spe enable' bit so user processes can execute SPE instructions.
242 This option is only useful if you have a processor that supports
243 SPE (e500, otherwise known as 85xx series), but does not have any
244 effect on a non-spe cpu (it does, however add code to the kernel).
246 If in doubt, say Y here.
250 depends on 6xx || POWER3 || POWER4 || PPC64
253 config PPC_STD_MMU_32
255 depends on PPC_STD_MMU && PPC32
257 config VIRT_CPU_ACCOUNTING
258 bool "Deterministic task and CPU time accounting"
262 Select this option to enable more accurate task and CPU time
263 accounting. This is done by reading a CPU counter on each
264 kernel entry and exit and on transitions within the kernel
265 between system, softirq and hardirq state, so there is a
266 small performance impact. This also enables accounting of
267 stolen time on logically-partitioned systems running on
268 IBM POWER5-based machines.
270 If in doubt, say Y here.
273 depends on PPC_STD_MMU
274 bool "Symmetric multi-processing support"
276 This enables support for systems with more than one CPU. If you have
277 a system with only one CPU, say N. If you have a system with more
278 than one CPU, say Y. Note that the kernel does not currently
279 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
280 since they have inadequate hardware support for multiprocessor
283 If you say N here, the kernel will run on single and multiprocessor
284 machines, but will use only one CPU of a multiprocessor machine. If
285 you say Y here, the kernel will run on single-processor machines.
286 On a single-processor machine, the kernel will run faster if you say
289 If you don't know what to do here, say N.
292 int "Maximum number of CPUs (2-128)"
295 default "32" if PPC64
298 config NOT_COHERENT_CACHE
300 depends on 4xx || 8xx || E200
304 source "init/Kconfig"
306 menu "Platform support"
307 depends on PPC64 || CLASSIC32
310 prompt "Machine type"
311 default PPC_MULTIPLATFORM
313 config PPC_MULTIPLATFORM
314 bool "Generic desktop/server/laptop"
316 Select this option if configuring for an IBM pSeries or
317 RS/6000 machine, an Apple machine, or a PReP, CHRP,
318 Maple or Cell-based machine.
321 bool "IBM Legacy iSeries"
325 bool "Embedded 6xx/7xx/7xxx-based board"
326 depends on PPC32 && BROKEN
330 depends on PPC32 && BROKEN
332 Select APUS if configuring for a PowerUP Amiga.
333 More information is available at:
334 <http://linux-apus.sourceforge.net/>.
338 depends on PPC_MULTIPLATFORM && PPC64
339 bool " IBM pSeries & new (POWER5-based) iSeries"
342 select RTAS_ERROR_LOGGING
343 select PPC_UDBG_16550
347 bool " Common Hardware Reference Platform (CHRP) based machines"
348 depends on PPC_MULTIPLATFORM && PPC32
350 select PPC_INDIRECT_PCI
353 select PPC_UDBG_16550
357 bool " Apple PowerMac based machines"
358 depends on PPC_MULTIPLATFORM
359 select PPC_INDIRECT_PCI if PPC32
360 select PPC_MPC106 if PPC32
365 depends on PPC_PMAC && POWER4
367 select MPIC_BROKEN_U3
368 select GENERIC_TBSYNC
373 bool " PowerPC Reference Platform (PReP) based machines"
374 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
376 select PPC_INDIRECT_PCI
377 select PPC_UDBG_16550
381 depends on PPC_MULTIPLATFORM && PPC64
382 bool " Maple 970FX Evaluation Board"
384 select MPIC_BROKEN_U3
385 select GENERIC_TBSYNC
386 select PPC_UDBG_16550
390 This option enables support for the Maple 970FX Evaluation Board.
391 For more informations, refer to <http://www.970eval.com>
394 bool " Cell Broadband Processor Architecture"
395 depends on PPC_MULTIPLATFORM && PPC64
398 select PPC_UDBG_16550
400 # Systemsim configuration
402 bool " IBM Full System Simulator (systemsim) support"
405 Support booting resulting image under IBMs Full System Simulator.
408 tristate " IBM Full System Simulator Bogus Disk Support"
411 Provides quick access to disk images in the simulator without
412 simulating a full IDE or SCSI device.
415 tristate " IBM Full System Simulator Bogus Network Support"
418 Provides quick access to a raw ethernet device in the simulator
419 without simulating any specific network device hardware.
422 depends on PPC_PSERIES
428 depends on PPC_MULTIPLATFORM && PPC64
432 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
440 config RTAS_ERROR_LOGGING
446 bool "Proc interface to RTAS"
451 tristate "Firmware flash interface"
452 depends on PPC64 && RTAS_PROC
458 config MPIC_BROKEN_U3
469 depends on PPC_PSERIES || PPC_ISERIES
474 depends on PPC_PSERIES
475 bool "Support for GX bus based adapters"
477 Bus device driver for GX bus based adapters.
487 source "drivers/cpufreq/Kconfig"
490 bool "Support for Apple PowerBooks"
491 depends on CPU_FREQ && ADB_PMU && PPC32
492 select CPU_FREQ_TABLE
494 This adds support for frequency switching on Apple PowerBooks,
495 this currently includes some models of iBook & Titanium
498 config CPU_FREQ_PMAC64
499 bool "Support for some Apple G5s"
500 depends on CPU_FREQ && PMAC_SMU && PPC64
501 select CPU_FREQ_TABLE
503 This adds support for frequency switching on Apple iMac G5,
504 and some of the more recent desktop G5 machines as well.
506 config PPC601_SYNC_FIX
507 bool "Workarounds for PPC601 bugs"
508 depends on 6xx && (PPC_PREP || PPC_PMAC)
510 Some versions of the PPC601 (the first PowerPC chip) have bugs which
511 mean that extra synchronization instructions are required near
512 certain instructions, typically those that make major changes to the
513 CPU state. These extra instructions reduce performance slightly.
514 If you say N here, these extra instructions will not be included,
515 resulting in a kernel which will run faster but may not run at all
516 on some systems with the PPC601 chip.
518 If in doubt, say Y here.
521 bool "On-chip CPU temperature sensor support"
524 G3 and G4 processors have an on-chip temperature sensor called the
525 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
526 temperature within 2-4 degrees Celsius. This option shows the current
527 on-die temperature in /proc/cpuinfo if the cpu supports it.
529 Unfortunately, on some chip revisions, this sensor is very inaccurate
530 and in many cases, does not work at all, so don't assume the cpu
531 temp is actually what /proc/cpuinfo says it is.
534 bool "Interrupt driven TAU driver (DANGEROUS)"
537 The TAU supports an interrupt driven mode which causes an interrupt
538 whenever the temperature goes out of range. This is the fastest way
539 to get notified the temp has exceeded a range. With this option off,
540 a timer is used to re-check the temperature periodically.
542 However, on some cpus it appears that the TAU interrupt hardware
543 is buggy and can cause a situation which would lead unexplained hard
546 Unless you are extending the TAU driver, or enjoy kernel/hardware
547 debugging, leave this option off.
550 bool "Average high and low temp"
553 The TAU hardware can compare the temperature to an upper and lower
554 bound. The default behavior is to show both the upper and lower
555 bound in /proc/cpuinfo. If the range is large, the temperature is
556 either changing a lot, or the TAU hardware is broken (likely on some
557 G4's). If the range is small (around 4 degrees), the temperature is
558 relatively stable. If you say Y here, a single temperature value,
559 halfway between the upper and lower bounds, will be reported in
562 If in doubt, say N here.
565 source arch/powerpc/platforms/embedded6xx/Kconfig
566 source arch/powerpc/platforms/4xx/Kconfig
567 source arch/powerpc/platforms/83xx/Kconfig
568 source arch/powerpc/platforms/85xx/Kconfig
569 source arch/powerpc/platforms/8xx/Kconfig
570 source arch/powerpc/platforms/cell/Kconfig
572 menu "Kernel options"
575 bool "High memory support"
578 source kernel/Kconfig.hz
579 source kernel/Kconfig.preempt
580 source "fs/Kconfig.binfmt"
582 # We optimistically allocate largepages from the VM, so make the limit
583 # large enough (16MB). This badly named config option is actually
585 config FORCE_MAX_ZONEORDER
588 default "9" if PPC_64K_PAGES
591 config MATH_EMULATION
592 bool "Math emulation"
593 depends on 4xx || 8xx || E200 || E500
595 Some PowerPC chips designed for embedded applications do not have
596 a floating-point unit and therefore do not implement the
597 floating-point instructions in the PowerPC instruction set. If you
598 say Y here, the kernel will include code to emulate a floating-point
599 unit, which will allow programs that use floating-point
603 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
604 depends on EXPERIMENTAL && PPC64
607 Cause IO segments sent to a device for DMA to be merged virtually
608 by the IOMMU when they happen to have been allocated contiguously.
609 This doesn't add pressure to the IOMMU allocator. However, some
610 drivers don't support getting large merged segments coming back
611 from *_map_sg(). Say Y if you know the drivers you are using are
612 properly handling this case.
615 bool "Support for enabling/disabling CPUs"
616 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
618 Say Y here to be able to disable and re-enable individual
619 CPUs at runtime on SMP machines.
621 Say N if you are unsure.
623 config ARCH_ENABLE_MEMORY_HOTPLUG
627 bool "kexec system call (EXPERIMENTAL)"
628 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
630 kexec is a system call that implements the ability to shutdown your
631 current kernel, and to start another kernel. It is like a reboot
632 but it is indepedent of the system firmware. And like a reboot
633 you can start any kernel with it, not just Linux.
635 The name comes from the similiarity to the exec system call.
637 It is an ongoing process to be certain the hardware in a machine
638 is properly shutdown, so do not be surprised if this code does not
639 initially work for you. It may help to enable device hotplugging
640 support. As of this writing the exact hardware interface is
641 strongly in flux, so no good recommendation can be made.
644 bool "Build a kdump crash kernel (EXPERIMENTAL)"
645 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
647 Build a kernel suitable for use as a kdump capture kernel.
648 The kernel will be linked at a different address than normal, and
649 so can only be used for Kdump.
651 Don't change this unless you know what you are doing.
655 depends on 8xx || 8260
659 bool "PC PS/2 style Keyboard"
660 depends on 4xx || CPM2
663 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
664 default y if PPC_PREP
667 bool "Distribute interrupts on all CPUs by default"
668 depends on SMP && !MV64360
670 This option gives the kernel permission to distribute IRQs across
671 multiple CPUs. Saying N here will route all IRQs to the first
672 CPU. Generally saying Y is safe, although some problems have been
673 reported with SMP Power Macintoshes with this option enabled.
675 source "arch/powerpc/platforms/pseries/Kconfig"
680 default y if SMP && PPC_PSERIES
685 depends on NEED_MULTIPLE_NODES
687 config ARCH_SELECT_MEMORY_MODEL
691 config ARCH_FLATMEM_ENABLE
693 depends on (PPC64 && !NUMA) || PPC32
695 config ARCH_SPARSEMEM_ENABLE
699 config ARCH_SPARSEMEM_DEFAULT
701 depends on SMP && PPC_PSERIES
705 config HAVE_ARCH_EARLY_PFN_TO_NID
707 depends on NEED_MULTIPLE_NODES
709 config ARCH_MEMORY_PROBE
711 depends on MEMORY_HOTPLUG
717 This option changes the kernel logical page size to 64k. On machines
718 without processor support for 64k pages, the kernel will simulate
719 them by loading each individual 4k page on demand transparently,
720 while on hardware with such support, it will be used to map
721 normal application pages.
724 bool "SMT (Hyperthreading) scheduler support"
725 depends on PPC64 && SMP
728 SMT scheduler support improves the CPU scheduler's decision making
729 when dealing with POWER5 cpus at a cost of slightly increased
730 overhead in some places. If unsure say N here.
732 config PROC_DEVICETREE
733 bool "Support for device tree in /proc"
736 This option adds a device-tree directory under /proc which contains
737 an image of the device tree that the kernel copies from Open
738 Firmware or other boot firmware. If unsure, say Y here.
740 source "arch/powerpc/platforms/prep/Kconfig"
743 bool "Default bootloader kernel arguments"
744 depends on !PPC_ISERIES
747 string "Initial kernel command string"
748 depends on CMDLINE_BOOL
749 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
751 On some platforms, there is currently no way for the boot loader to
752 pass arguments to the kernel. For these platforms, you can supply
753 some command-line options at build time by entering them here. In
754 most cases you will need to specify the root device here.
757 source kernel/power/Kconfig
761 bool "Enable seccomp to safely compute untrusted bytecode"
765 This kernel feature is useful for number crunching applications
766 that may need to compute untrusted bytecode during their
767 execution. By using pipes or other transports made available to
768 the process as file descriptors supporting the read/write
769 syscalls, it's possible to isolate those applications in
770 their own address space using seccomp. Once seccomp is
771 enabled via /proc/<pid>/seccomp, it cannot be disabled
772 and the task is only allowed to execute a few safe syscalls
773 defined by each seccomp mode.
775 If unsure, say Y. Only embedded should say N here.
786 bool "Support for ISA-bus hardware"
787 depends on PPC_PREP || PPC_CHRP
790 Find out whether you have ISA slots on your motherboard. ISA is the
791 name of a bus system, i.e. the way the CPU talks to the other stuff
792 inside your box. If you have an Apple machine, say N here; if you
793 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
794 you have an embedded board, consult your board documentation.
796 config GENERIC_ISA_DMA
798 depends on PPC64 || POWER4 || 6xx && !CPM2
805 config PPC_INDIRECT_PCI
808 default y if 40x || 44x
820 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
825 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
826 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx
827 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
828 default PCI_QSPAN if !4xx && !CPM2 && 8xx
830 Find out whether your system includes a PCI bus. PCI is the name of
831 a bus system, i.e. the way the CPU talks to the other stuff inside
832 your box. If you say Y here, the kernel will include drivers and
833 infrastructure code to support PCI bus devices.
841 depends on !4xx && !CPM2 && 8xx
844 Say Y here if you have a system based on a Motorola 8xx-series
845 embedded processor with a QSPAN PCI interface, otherwise say N.
849 depends on PCI && 8260
850 select PPC_INDIRECT_PCI
854 bool " Enable workaround for MPC826x erratum PCI 9"
855 depends on PCI_8260 && !ADS8272
859 prompt " IDMA channel for PCI 9 workaround"
862 config 8260_PCI9_IDMA1
865 config 8260_PCI9_IDMA2
868 config 8260_PCI9_IDMA3
871 config 8260_PCI9_IDMA4
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 "kernel/vserver/Kconfig"
1044 source "security/Kconfig"
1048 depends on COMPAT && KEYS
1051 source "crypto/Kconfig"