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_CALIBRATE_DELAY
58 depends on COMPAT && SYSVIPC
61 # All PPC32s use generic nvram driver through ppc_md
66 config SCHED_NO_NO_OMIT_FRAME_POINTER
70 config ARCH_MAY_HAVE_PC_FDC
83 default y if PPC32 && SMP
86 menu "Processor support"
88 prompt "Processor Type"
97 There are four families of PowerPC chips supported. The more common
98 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
99 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
100 embedded versions (403 and 405) and the high end 64 bit Power
101 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
103 Unless you are building a kernel for one of the embedded processor
104 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
105 Note that the kernel runs in 32-bit mode even on 64-bit chips.
108 bool "Freescale 52xx"
113 bool "Freescale 82xx"
118 bool "Freescale 83xx"
134 bool "Freescale e200"
137 bool "Freescale e500"
141 bool "Optimize for POWER4"
145 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
146 The resulting binary will not work on POWER3 or RS64 processors
147 when compiled with binutils 2.15 or later.
152 default y if !POWER4_ONLY
161 # this is temp to handle compat with arch=ppc
171 depends on E200 || E500
176 depends on E200 || E500
181 depends on 44x || E500
183 default y if E500 && PHYS_64BIT
186 bool 'Large physical address support' if E500
187 depends on 44x || E500
190 This option enables kernel support for larger than 32-bit physical
191 addresses. This features is not be available on all e500 cores.
193 If in doubt, say N here.
196 bool "AltiVec Support"
197 depends on CLASSIC32 || POWER4
199 This option enables kernel support for the Altivec extensions to the
200 PowerPC processor. The kernel currently supports saving and restoring
201 altivec registers, and turning on the 'altivec enable' bit so user
202 processes can execute altivec instructions.
204 This option is only usefully if you have a processor that supports
205 altivec (G4, otherwise known as 74xx series), but does not have
206 any affect on a non-altivec cpu (it does, however add code to the
209 If in doubt, say Y here.
213 depends on E200 || E500
215 This option enables kernel support for the Signal Processing
216 Extensions (SPE) to the PowerPC processor. The kernel currently
217 supports saving and restoring SPE registers, and turning on the
218 'spe enable' bit so user processes can execute SPE instructions.
220 This option is only useful if you have a processor that supports
221 SPE (e500, otherwise known as 85xx series), but does not have any
222 effect on a non-spe cpu (it does, however add code to the kernel).
224 If in doubt, say Y here.
228 depends on 6xx || POWER3 || POWER4 || PPC64
231 config PPC_STD_MMU_32
233 depends on PPC_STD_MMU && PPC32
236 depends on PPC_STD_MMU
237 bool "Symmetric multi-processing support"
239 This enables support for systems with more than one CPU. If you have
240 a system with only one CPU, say N. If you have a system with more
241 than one CPU, say Y. Note that the kernel does not currently
242 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
243 since they have inadequate hardware support for multiprocessor
246 If you say N here, the kernel will run on single and multiprocessor
247 machines, but will use only one CPU of a multiprocessor machine. If
248 you say Y here, the kernel will run on single-processor machines.
249 On a single-processor machine, the kernel will run faster if you say
252 If you don't know what to do here, say N.
255 int "Maximum number of CPUs (2-128)"
258 default "32" if PPC64
261 config NOT_COHERENT_CACHE
263 depends on 4xx || 8xx || E200
267 source "init/Kconfig"
269 menu "Platform support"
270 depends on PPC64 || CLASSIC32
273 prompt "Machine type"
274 default PPC_MULTIPLATFORM
276 config PPC_MULTIPLATFORM
277 bool "Generic desktop/server/laptop"
279 Select this option if configuring for an IBM pSeries or
280 RS/6000 machine, an Apple machine, or a PReP, CHRP,
281 Maple or Cell-based machine.
284 bool "IBM Legacy iSeries"
288 bool "Embedded 6xx/7xx/7xxx-based board"
289 depends on PPC32 && BROKEN
293 depends on PPC32 && BROKEN
295 Select APUS if configuring for a PowerUP Amiga.
296 More information is available at:
297 <http://linux-apus.sourceforge.net/>.
301 depends on PPC_MULTIPLATFORM && PPC64
302 bool " IBM pSeries & new (POWER5-based) iSeries"
305 select RTAS_ERROR_LOGGING
306 select PPC_UDBG_16550
310 bool " Common Hardware Reference Platform (CHRP) based machines"
311 depends on PPC_MULTIPLATFORM && PPC32
313 select PPC_INDIRECT_PCI
316 select PPC_UDBG_16550
320 bool " Apple PowerMac based machines"
321 depends on PPC_MULTIPLATFORM
322 select PPC_INDIRECT_PCI if PPC32
323 select PPC_MPC106 if PPC32
328 depends on PPC_PMAC && POWER4
330 select MPIC_BROKEN_U3
331 select GENERIC_TBSYNC
335 bool " PowerPC Reference Platform (PReP) based machines"
336 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
338 select PPC_INDIRECT_PCI
339 select PPC_UDBG_16550
343 depends on PPC_MULTIPLATFORM && PPC64
344 bool " Maple 970FX Evaluation Board"
346 select MPIC_BROKEN_U3
347 select GENERIC_TBSYNC
348 select PPC_UDBG_16550
351 This option enables support for the Maple 970FX Evaluation Board.
352 For more informations, refer to <http://www.970eval.com>
355 bool " Cell Broadband Processor Architecture"
356 depends on PPC_MULTIPLATFORM && PPC64
359 select PPC_UDBG_16550
362 depends on PPC_PSERIES
368 depends on PPC_MULTIPLATFORM && PPC64
372 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
380 config RTAS_ERROR_LOGGING
386 bool "Proc interface to RTAS"
391 tristate "Firmware flash interface"
392 depends on PPC64 && RTAS_PROC
398 config MPIC_BROKEN_U3
409 depends on PPC_PSERIES || PPC_ISERIES
414 depends on PPC_PSERIES
415 bool "Support for GX bus based adapters"
417 Bus device driver for GX bus based adapters.
423 source "drivers/cpufreq/Kconfig"
426 bool "Support for Apple PowerBooks"
427 depends on CPU_FREQ && ADB_PMU && PPC32
428 select CPU_FREQ_TABLE
430 This adds support for frequency switching on Apple PowerBooks,
431 this currently includes some models of iBook & Titanium
434 config CPU_FREQ_PMAC64
435 bool "Support for some Apple G5s"
436 depends on CPU_FREQ && PMAC_SMU && PPC64
437 select CPU_FREQ_TABLE
439 This adds support for frequency switching on Apple iMac G5,
440 and some of the more recent desktop G5 machines as well.
442 config PPC601_SYNC_FIX
443 bool "Workarounds for PPC601 bugs"
444 depends on 6xx && (PPC_PREP || PPC_PMAC)
446 Some versions of the PPC601 (the first PowerPC chip) have bugs which
447 mean that extra synchronization instructions are required near
448 certain instructions, typically those that make major changes to the
449 CPU state. These extra instructions reduce performance slightly.
450 If you say N here, these extra instructions will not be included,
451 resulting in a kernel which will run faster but may not run at all
452 on some systems with the PPC601 chip.
454 If in doubt, say Y here.
457 bool "Thermal Management Support"
460 G3 and G4 processors have an on-chip temperature sensor called the
461 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
462 temperature within 2-4 degrees Celsius. This option shows the current
463 on-die temperature in /proc/cpuinfo if the cpu supports it.
465 Unfortunately, on some chip revisions, this sensor is very inaccurate
466 and in some cases, does not work at all, so don't assume the cpu
467 temp is actually what /proc/cpuinfo says it is.
470 bool "Interrupt driven TAU driver (DANGEROUS)"
473 The TAU supports an interrupt driven mode which causes an interrupt
474 whenever the temperature goes out of range. This is the fastest way
475 to get notified the temp has exceeded a range. With this option off,
476 a timer is used to re-check the temperature periodically.
478 However, on some cpus it appears that the TAU interrupt hardware
479 is buggy and can cause a situation which would lead unexplained hard
482 Unless you are extending the TAU driver, or enjoy kernel/hardware
483 debugging, leave this option off.
486 bool "Average high and low temp"
489 The TAU hardware can compare the temperature to an upper and lower
490 bound. The default behavior is to show both the upper and lower
491 bound in /proc/cpuinfo. If the range is large, the temperature is
492 either changing a lot, or the TAU hardware is broken (likely on some
493 G4's). If the range is small (around 4 degrees), the temperature is
494 relatively stable. If you say Y here, a single temperature value,
495 halfway between the upper and lower bounds, will be reported in
498 If in doubt, say N here.
501 source arch/powerpc/platforms/embedded6xx/Kconfig
502 source arch/powerpc/platforms/4xx/Kconfig
503 source arch/powerpc/platforms/83xx/Kconfig
504 source arch/powerpc/platforms/85xx/Kconfig
505 source arch/powerpc/platforms/8xx/Kconfig
506 source arch/powerpc/platforms/cell/Kconfig
508 menu "Kernel options"
511 bool "High memory support"
514 source kernel/Kconfig.hz
515 source kernel/Kconfig.preempt
516 source "fs/Kconfig.binfmt"
518 # We optimistically allocate largepages from the VM, so make the limit
519 # large enough (16MB). This badly named config option is actually
521 config FORCE_MAX_ZONEORDER
524 default "9" if PPC_64K_PAGES
527 config MATH_EMULATION
528 bool "Math emulation"
529 depends on 4xx || 8xx || E200 || E500
531 Some PowerPC chips designed for embedded applications do not have
532 a floating-point unit and therefore do not implement the
533 floating-point instructions in the PowerPC instruction set. If you
534 say Y here, the kernel will include code to emulate a floating-point
535 unit, which will allow programs that use floating-point
539 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
540 depends on EXPERIMENTAL && PPC64
543 Cause IO segments sent to a device for DMA to be merged virtually
544 by the IOMMU when they happen to have been allocated contiguously.
545 This doesn't add pressure to the IOMMU allocator. However, some
546 drivers don't support getting large merged segments coming back
547 from *_map_sg(). Say Y if you know the drivers you are using are
548 properly handling this case.
551 bool "Support for enabling/disabling CPUs"
552 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
554 Say Y here to be able to disable and re-enable individual
555 CPUs at runtime on SMP machines.
557 Say N if you are unsure.
560 bool "kexec system call (EXPERIMENTAL)"
561 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
563 kexec is a system call that implements the ability to shutdown your
564 current kernel, and to start another kernel. It is like a reboot
565 but it is indepedent of the system firmware. And like a reboot
566 you can start any kernel with it, not just Linux.
568 The name comes from the similiarity to the exec system call.
570 It is an ongoing process to be certain the hardware in a machine
571 is properly shutdown, so do not be surprised if this code does not
572 initially work for you. It may help to enable device hotplugging
573 support. As of this writing the exact hardware interface is
574 strongly in flux, so no good recommendation can be made.
577 bool "kernel crash dumps (EXPERIMENTAL)"
578 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
580 Build a kernel suitable for use as a kdump capture kernel.
581 The kernel will be linked at a different address than normal, and
582 so can only be used for Kdump.
584 Don't change this unless you know what you are doing.
588 depends on 8xx || 8260
592 bool "PC PS/2 style Keyboard"
593 depends on 4xx || CPM2
596 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
597 default y if PPC_PREP
600 bool "Distribute interrupts on all CPUs by default"
601 depends on SMP && !MV64360
603 This option gives the kernel permission to distribute IRQs across
604 multiple CPUs. Saying N here will route all IRQs to the first
605 CPU. Generally saying Y is safe, although some problems have been
606 reported with SMP Power Macintoshes with this option enabled.
608 source "arch/powerpc/platforms/pseries/Kconfig"
613 default y if SMP && PPC_PSERIES
615 config ARCH_SELECT_MEMORY_MODEL
619 config ARCH_FLATMEM_ENABLE
621 depends on (PPC64 && !NUMA) || PPC32
623 config ARCH_SPARSEMEM_ENABLE
627 config ARCH_SPARSEMEM_DEFAULT
629 depends on SMP && PPC_PSERIES
633 config HAVE_ARCH_EARLY_PFN_TO_NID
635 depends on NEED_MULTIPLE_NODES
637 config ARCH_MEMORY_PROBE
639 depends on MEMORY_HOTPLUG
645 This option changes the kernel logical page size to 64k. On machines
646 without processor support for 64k pages, the kernel will simulate
647 them by loading each individual 4k page on demand transparently,
648 while on hardware with such support, it will be used to map
649 normal application pages.
652 bool "SMT (Hyperthreading) scheduler support"
653 depends on PPC64 && SMP
656 SMT scheduler support improves the CPU scheduler's decision making
657 when dealing with POWER5 cpus at a cost of slightly increased
658 overhead in some places. If unsure say N here.
660 config PROC_DEVICETREE
661 bool "Support for device tree in /proc"
664 This option adds a device-tree directory under /proc which contains
665 an image of the device tree that the kernel copies from Open
666 Firmware or other boot firmware. If unsure, say Y here.
668 source "arch/powerpc/platforms/prep/Kconfig"
671 bool "Default bootloader kernel arguments"
672 depends on !PPC_ISERIES
675 string "Initial kernel command string"
676 depends on CMDLINE_BOOL
677 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
679 On some platforms, there is currently no way for the boot loader to
680 pass arguments to the kernel. For these platforms, you can supply
681 some command-line options at build time by entering them here. In
682 most cases you will need to specify the root device here.
685 source kernel/power/Kconfig
689 bool "Enable seccomp to safely compute untrusted bytecode"
693 This kernel feature is useful for number crunching applications
694 that may need to compute untrusted bytecode during their
695 execution. By using pipes or other transports made available to
696 the process as file descriptors supporting the read/write
697 syscalls, it's possible to isolate those applications in
698 their own address space using seccomp. Once seccomp is
699 enabled via /proc/<pid>/seccomp, it cannot be disabled
700 and the task is only allowed to execute a few safe syscalls
701 defined by each seccomp mode.
703 If unsure, say Y. Only embedded should say N here.
714 bool "Support for ISA-bus hardware"
715 depends on PPC_PREP || PPC_CHRP
718 Find out whether you have ISA slots on your motherboard. ISA is the
719 name of a bus system, i.e. the way the CPU talks to the other stuff
720 inside your box. If you have an Apple machine, say N here; if you
721 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
722 you have an embedded board, consult your board documentation.
724 config GENERIC_ISA_DMA
726 depends on PPC64 || POWER4 || 6xx && !CPM2
734 config PPC_INDIRECT_PCI
737 default y if 40x || 44x || 85xx
749 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
754 bool "PCI support" if 40x || CPM2 || PPC_83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
755 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !85xx
756 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
757 default PCI_QSPAN if !4xx && !CPM2 && 8xx
759 Find out whether your system includes a PCI bus. PCI is the name of
760 a bus system, i.e. the way the CPU talks to the other stuff inside
761 your box. If you say Y here, the kernel will include drivers and
762 infrastructure code to support PCI bus devices.
770 depends on !4xx && !CPM2 && 8xx
773 Say Y here if you have a system based on a Motorola 8xx-series
774 embedded processor with a QSPAN PCI interface, otherwise say N.
778 depends on PCI && 8260
779 select PPC_INDIRECT_PCI
783 bool " Enable workaround for MPC826x erratum PCI 9"
784 depends on PCI_8260 && !ADS8272
788 prompt " IDMA channel for PCI 9 workaround"
791 config 8260_PCI9_IDMA1
794 config 8260_PCI9_IDMA2
797 config 8260_PCI9_IDMA3
800 config 8260_PCI9_IDMA4
805 source "drivers/pci/Kconfig"
807 source "drivers/pcmcia/Kconfig"
809 source "drivers/pci/hotplug/Kconfig"
813 menu "Advanced setup"
816 config ADVANCED_OPTIONS
817 bool "Prompt for advanced kernel configuration options"
819 This option will enable prompting for a variety of advanced kernel
820 configuration options. These options can cause the kernel to not
821 work if they are set incorrectly, but can be used to optimize certain
822 aspects of kernel memory management.
824 Unless you know what you are doing, say N here.
826 comment "Default settings for advanced configuration options are used"
827 depends on !ADVANCED_OPTIONS
829 config HIGHMEM_START_BOOL
830 bool "Set high memory pool address"
831 depends on ADVANCED_OPTIONS && HIGHMEM
833 This option allows you to set the base address of the kernel virtual
834 area used to map high memory pages. This can be useful in
835 optimizing the layout of kernel virtual memory.
837 Say N here unless you know what you are doing.
840 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
843 config LOWMEM_SIZE_BOOL
844 bool "Set maximum low memory"
845 depends on ADVANCED_OPTIONS
847 This option allows you to set the maximum amount of memory which
848 will be used as "low memory", that is, memory which the kernel can
849 access directly, without having to set up a kernel virtual mapping.
850 This can be useful in optimizing the layout of kernel virtual
853 Say N here unless you know what you are doing.
856 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
859 config KERNEL_START_BOOL
860 bool "Set custom kernel base address"
861 depends on ADVANCED_OPTIONS
863 This option allows you to set the kernel virtual address at which
864 the kernel will map low memory (the kernel image will be linked at
865 this address). This can be useful in optimizing the virtual memory
866 layout of the system.
868 Say N here unless you know what you are doing.
871 hex "Virtual address of kernel base" if KERNEL_START_BOOL
874 config TASK_SIZE_BOOL
875 bool "Set custom user task size"
876 depends on ADVANCED_OPTIONS
878 This option allows you to set the amount of virtual address space
879 allocated to user tasks. This can be useful in optimizing the
880 virtual memory layout of the system.
882 Say N here unless you know what you are doing.
885 hex "Size of user task space" if TASK_SIZE_BOOL
888 config CONSISTENT_START_BOOL
889 bool "Set custom consistent memory pool address"
890 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
892 This option allows you to set the base virtual address
893 of the the consistent memory pool. This pool of virtual
894 memory is used to make consistent memory allocations.
896 config CONSISTENT_START
897 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
898 default "0xff100000" if NOT_COHERENT_CACHE
900 config CONSISTENT_SIZE_BOOL
901 bool "Set custom consistent memory pool size"
902 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
904 This option allows you to set the size of the the
905 consistent memory pool. This pool of virtual memory
906 is used to make consistent memory allocations.
908 config CONSISTENT_SIZE
909 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
910 default "0x00200000" if NOT_COHERENT_CACHE
912 config BOOT_LOAD_BOOL
913 bool "Set the boot link/load address"
914 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
916 This option allows you to set the initial load address of the zImage
917 or zImage.initrd file. This can be useful if you are on a board
918 which has a small amount of memory.
920 Say N here unless you know what you are doing.
923 hex "Link/load address for booting" if BOOT_LOAD_BOOL
924 default "0x00400000" if 40x || 8xx || 8260
925 default "0x01000000" if 44x
929 bool "Pinned Kernel TLBs (860 ONLY)"
930 depends on ADVANCED_OPTIONS && 8xx
936 default "0xc000000000000000"
941 source "drivers/Kconfig"
945 # XXX source "arch/ppc/8xx_io/Kconfig"
947 # XXX source "arch/ppc/8260_io/Kconfig"
949 source "arch/powerpc/platforms/iseries/Kconfig"
953 menu "Instrumentation Support"
954 depends on EXPERIMENTAL
956 source "arch/powerpc/oprofile/Kconfig"
959 bool "Kprobes (EXPERIMENTAL)"
962 Kprobes allows you to trap at almost any kernel address and
963 execute a callback function. register_kprobe() establishes
964 a probepoint and specifies the callback. Kprobes is useful
965 for kernel debugging, non-intrusive instrumentation and testing.
966 If in doubt, say "N".
969 source "arch/powerpc/Kconfig.debug"
971 source "security/Kconfig"
975 depends on COMPAT && KEYS
978 source "crypto/Kconfig"