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
89 Used to allow a board to specify it wants a uImage built by default
92 menu "Processor support"
94 prompt "Processor Type"
103 There are four families of PowerPC chips supported. The more common
104 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
105 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
106 embedded versions (403 and 405) and the high end 64 bit Power
107 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
109 Unless you are building a kernel for one of the embedded processor
110 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
111 Note that the kernel runs in 32-bit mode even on 64-bit chips.
114 bool "Freescale 52xx"
119 bool "Freescale 82xx"
124 bool "Freescale 83xx"
140 bool "Freescale e200"
143 bool "Freescale e500"
147 bool "Optimize for POWER4"
151 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
152 The resulting binary will not work on POWER3 or RS64 processors
153 when compiled with binutils 2.15 or later.
158 default y if !POWER4_ONLY
167 # this is temp to handle compat with arch=ppc
177 depends on E200 || E500
182 depends on E200 || E500
187 depends on 44x || E500
189 default y if E500 && PHYS_64BIT
192 bool 'Large physical address support' if E500
193 depends on 44x || E500
196 This option enables kernel support for larger than 32-bit physical
197 addresses. This features is not be available on all e500 cores.
199 If in doubt, say N here.
202 bool "AltiVec Support"
203 depends on CLASSIC32 || POWER4
205 This option enables kernel support for the Altivec extensions to the
206 PowerPC processor. The kernel currently supports saving and restoring
207 altivec registers, and turning on the 'altivec enable' bit so user
208 processes can execute altivec instructions.
210 This option is only usefully if you have a processor that supports
211 altivec (G4, otherwise known as 74xx series), but does not have
212 any affect on a non-altivec cpu (it does, however add code to the
215 If in doubt, say Y here.
219 depends on E200 || E500
221 This option enables kernel support for the Signal Processing
222 Extensions (SPE) to the PowerPC processor. The kernel currently
223 supports saving and restoring SPE registers, and turning on the
224 'spe enable' bit so user processes can execute SPE instructions.
226 This option is only useful if you have a processor that supports
227 SPE (e500, otherwise known as 85xx series), but does not have any
228 effect on a non-spe cpu (it does, however add code to the kernel).
230 If in doubt, say Y here.
234 depends on 6xx || POWER3 || POWER4 || PPC64
237 config PPC_STD_MMU_32
239 depends on PPC_STD_MMU && PPC32
242 depends on PPC_STD_MMU
243 bool "Symmetric multi-processing support"
245 This enables support for systems with more than one CPU. If you have
246 a system with only one CPU, say N. If you have a system with more
247 than one CPU, say Y. Note that the kernel does not currently
248 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
249 since they have inadequate hardware support for multiprocessor
252 If you say N here, the kernel will run on single and multiprocessor
253 machines, but will use only one CPU of a multiprocessor machine. If
254 you say Y here, the kernel will run on single-processor machines.
255 On a single-processor machine, the kernel will run faster if you say
258 If you don't know what to do here, say N.
261 int "Maximum number of CPUs (2-128)"
264 default "32" if PPC64
267 config NOT_COHERENT_CACHE
269 depends on 4xx || 8xx || E200
273 source "init/Kconfig"
275 menu "Platform support"
276 depends on PPC64 || CLASSIC32
279 prompt "Machine type"
280 default PPC_MULTIPLATFORM
282 config PPC_MULTIPLATFORM
283 bool "Generic desktop/server/laptop"
285 Select this option if configuring for an IBM pSeries or
286 RS/6000 machine, an Apple machine, or a PReP, CHRP,
287 Maple or Cell-based machine.
290 bool "IBM Legacy iSeries"
294 bool "Embedded 6xx/7xx/7xxx-based board"
295 depends on PPC32 && BROKEN
299 depends on PPC32 && BROKEN
301 Select APUS if configuring for a PowerUP Amiga.
302 More information is available at:
303 <http://linux-apus.sourceforge.net/>.
307 depends on PPC_MULTIPLATFORM && PPC64
308 bool " IBM pSeries & new (POWER5-based) iSeries"
311 select RTAS_ERROR_LOGGING
312 select PPC_UDBG_16550
316 bool " Common Hardware Reference Platform (CHRP) based machines"
317 depends on PPC_MULTIPLATFORM && PPC32
319 select PPC_INDIRECT_PCI
322 select PPC_UDBG_16550
326 bool " Apple PowerMac based machines"
327 depends on PPC_MULTIPLATFORM
328 select PPC_INDIRECT_PCI if PPC32
329 select PPC_MPC106 if PPC32
334 depends on PPC_PMAC && POWER4
336 select MPIC_BROKEN_U3
337 select GENERIC_TBSYNC
341 bool " PowerPC Reference Platform (PReP) based machines"
342 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
344 select PPC_INDIRECT_PCI
345 select PPC_UDBG_16550
349 depends on PPC_MULTIPLATFORM && PPC64
350 bool " Maple 970FX Evaluation Board"
352 select MPIC_BROKEN_U3
353 select GENERIC_TBSYNC
354 select PPC_UDBG_16550
357 This option enables support for the Maple 970FX Evaluation Board.
358 For more informations, refer to <http://www.970eval.com>
361 bool " Cell Broadband Processor Architecture"
362 depends on PPC_MULTIPLATFORM && PPC64
365 select PPC_UDBG_16550
368 depends on PPC_PSERIES
374 depends on PPC_MULTIPLATFORM && PPC64
378 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
386 config RTAS_ERROR_LOGGING
392 bool "Proc interface to RTAS"
397 tristate "Firmware flash interface"
398 depends on PPC64 && RTAS_PROC
404 config MPIC_BROKEN_U3
415 depends on PPC_PSERIES || PPC_ISERIES
420 depends on PPC_PSERIES
421 bool "Support for GX bus based adapters"
423 Bus device driver for GX bus based adapters.
429 source "drivers/cpufreq/Kconfig"
432 bool "Support for Apple PowerBooks"
433 depends on CPU_FREQ && ADB_PMU && PPC32
434 select CPU_FREQ_TABLE
436 This adds support for frequency switching on Apple PowerBooks,
437 this currently includes some models of iBook & Titanium
440 config CPU_FREQ_PMAC64
441 bool "Support for some Apple G5s"
442 depends on CPU_FREQ && PMAC_SMU && PPC64
443 select CPU_FREQ_TABLE
445 This adds support for frequency switching on Apple iMac G5,
446 and some of the more recent desktop G5 machines as well.
448 config PPC601_SYNC_FIX
449 bool "Workarounds for PPC601 bugs"
450 depends on 6xx && (PPC_PREP || PPC_PMAC)
452 Some versions of the PPC601 (the first PowerPC chip) have bugs which
453 mean that extra synchronization instructions are required near
454 certain instructions, typically those that make major changes to the
455 CPU state. These extra instructions reduce performance slightly.
456 If you say N here, these extra instructions will not be included,
457 resulting in a kernel which will run faster but may not run at all
458 on some systems with the PPC601 chip.
460 If in doubt, say Y here.
463 bool "Thermal Management Support"
466 G3 and G4 processors have an on-chip temperature sensor called the
467 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
468 temperature within 2-4 degrees Celsius. This option shows the current
469 on-die temperature in /proc/cpuinfo if the cpu supports it.
471 Unfortunately, on some chip revisions, this sensor is very inaccurate
472 and in some cases, does not work at all, so don't assume the cpu
473 temp is actually what /proc/cpuinfo says it is.
476 bool "Interrupt driven TAU driver (DANGEROUS)"
479 The TAU supports an interrupt driven mode which causes an interrupt
480 whenever the temperature goes out of range. This is the fastest way
481 to get notified the temp has exceeded a range. With this option off,
482 a timer is used to re-check the temperature periodically.
484 However, on some cpus it appears that the TAU interrupt hardware
485 is buggy and can cause a situation which would lead unexplained hard
488 Unless you are extending the TAU driver, or enjoy kernel/hardware
489 debugging, leave this option off.
492 bool "Average high and low temp"
495 The TAU hardware can compare the temperature to an upper and lower
496 bound. The default behavior is to show both the upper and lower
497 bound in /proc/cpuinfo. If the range is large, the temperature is
498 either changing a lot, or the TAU hardware is broken (likely on some
499 G4's). If the range is small (around 4 degrees), the temperature is
500 relatively stable. If you say Y here, a single temperature value,
501 halfway between the upper and lower bounds, will be reported in
504 If in doubt, say N here.
507 source arch/powerpc/platforms/embedded6xx/Kconfig
508 source arch/powerpc/platforms/4xx/Kconfig
509 source arch/powerpc/platforms/83xx/Kconfig
510 source arch/powerpc/platforms/85xx/Kconfig
511 source arch/powerpc/platforms/8xx/Kconfig
512 source arch/powerpc/platforms/cell/Kconfig
514 menu "Kernel options"
517 bool "High memory support"
520 source kernel/Kconfig.hz
521 source kernel/Kconfig.preempt
522 source "fs/Kconfig.binfmt"
524 # We optimistically allocate largepages from the VM, so make the limit
525 # large enough (16MB). This badly named config option is actually
527 config FORCE_MAX_ZONEORDER
530 default "9" if PPC_64K_PAGES
533 config MATH_EMULATION
534 bool "Math emulation"
535 depends on 4xx || 8xx || E200 || E500
537 Some PowerPC chips designed for embedded applications do not have
538 a floating-point unit and therefore do not implement the
539 floating-point instructions in the PowerPC instruction set. If you
540 say Y here, the kernel will include code to emulate a floating-point
541 unit, which will allow programs that use floating-point
545 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
546 depends on EXPERIMENTAL && PPC64
549 Cause IO segments sent to a device for DMA to be merged virtually
550 by the IOMMU when they happen to have been allocated contiguously.
551 This doesn't add pressure to the IOMMU allocator. However, some
552 drivers don't support getting large merged segments coming back
553 from *_map_sg(). Say Y if you know the drivers you are using are
554 properly handling this case.
557 bool "Support for enabling/disabling CPUs"
558 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
560 Say Y here to be able to disable and re-enable individual
561 CPUs at runtime on SMP machines.
563 Say N if you are unsure.
566 bool "kexec system call (EXPERIMENTAL)"
567 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
569 kexec is a system call that implements the ability to shutdown your
570 current kernel, and to start another kernel. It is like a reboot
571 but it is indepedent of the system firmware. And like a reboot
572 you can start any kernel with it, not just Linux.
574 The name comes from the similiarity to the exec system call.
576 It is an ongoing process to be certain the hardware in a machine
577 is properly shutdown, so do not be surprised if this code does not
578 initially work for you. It may help to enable device hotplugging
579 support. As of this writing the exact hardware interface is
580 strongly in flux, so no good recommendation can be made.
583 bool "kernel crash dumps (EXPERIMENTAL)"
584 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
586 Build a kernel suitable for use as a kdump capture kernel.
587 The kernel will be linked at a different address than normal, and
588 so can only be used for Kdump.
590 Don't change this unless you know what you are doing.
594 depends on 8xx || 8260
598 bool "PC PS/2 style Keyboard"
599 depends on 4xx || CPM2
602 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
603 default y if PPC_PREP
606 bool "Distribute interrupts on all CPUs by default"
607 depends on SMP && !MV64360
609 This option gives the kernel permission to distribute IRQs across
610 multiple CPUs. Saying N here will route all IRQs to the first
611 CPU. Generally saying Y is safe, although some problems have been
612 reported with SMP Power Macintoshes with this option enabled.
614 source "arch/powerpc/platforms/pseries/Kconfig"
619 default y if SMP && PPC_PSERIES
621 config ARCH_SELECT_MEMORY_MODEL
625 config ARCH_FLATMEM_ENABLE
627 depends on (PPC64 && !NUMA) || PPC32
629 config ARCH_SPARSEMEM_ENABLE
633 config ARCH_SPARSEMEM_DEFAULT
635 depends on SMP && PPC_PSERIES
639 config HAVE_ARCH_EARLY_PFN_TO_NID
641 depends on NEED_MULTIPLE_NODES
643 config ARCH_MEMORY_PROBE
645 depends on MEMORY_HOTPLUG
651 This option changes the kernel logical page size to 64k. On machines
652 without processor support for 64k pages, the kernel will simulate
653 them by loading each individual 4k page on demand transparently,
654 while on hardware with such support, it will be used to map
655 normal application pages.
658 bool "SMT (Hyperthreading) scheduler support"
659 depends on PPC64 && SMP
662 SMT scheduler support improves the CPU scheduler's decision making
663 when dealing with POWER5 cpus at a cost of slightly increased
664 overhead in some places. If unsure say N here.
666 config PROC_DEVICETREE
667 bool "Support for device tree in /proc"
670 This option adds a device-tree directory under /proc which contains
671 an image of the device tree that the kernel copies from Open
672 Firmware or other boot firmware. If unsure, say Y here.
674 source "arch/powerpc/platforms/prep/Kconfig"
677 bool "Default bootloader kernel arguments"
678 depends on !PPC_ISERIES
681 string "Initial kernel command string"
682 depends on CMDLINE_BOOL
683 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
685 On some platforms, there is currently no way for the boot loader to
686 pass arguments to the kernel. For these platforms, you can supply
687 some command-line options at build time by entering them here. In
688 most cases you will need to specify the root device here.
691 source kernel/power/Kconfig
695 bool "Enable seccomp to safely compute untrusted bytecode"
699 This kernel feature is useful for number crunching applications
700 that may need to compute untrusted bytecode during their
701 execution. By using pipes or other transports made available to
702 the process as file descriptors supporting the read/write
703 syscalls, it's possible to isolate those applications in
704 their own address space using seccomp. Once seccomp is
705 enabled via /proc/<pid>/seccomp, it cannot be disabled
706 and the task is only allowed to execute a few safe syscalls
707 defined by each seccomp mode.
709 If unsure, say Y. Only embedded should say N here.
720 bool "Support for ISA-bus hardware"
721 depends on PPC_PREP || PPC_CHRP
724 Find out whether you have ISA slots on your motherboard. ISA is the
725 name of a bus system, i.e. the way the CPU talks to the other stuff
726 inside your box. If you have an Apple machine, say N here; if you
727 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
728 you have an embedded board, consult your board documentation.
730 config GENERIC_ISA_DMA
732 depends on PPC64 || POWER4 || 6xx && !CPM2
740 config PPC_INDIRECT_PCI
743 default y if 40x || 44x || 85xx
755 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
760 bool "PCI support" if 40x || CPM2 || PPC_83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
761 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !85xx
762 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
763 default PCI_QSPAN if !4xx && !CPM2 && 8xx
765 Find out whether your system includes a PCI bus. PCI is the name of
766 a bus system, i.e. the way the CPU talks to the other stuff inside
767 your box. If you say Y here, the kernel will include drivers and
768 infrastructure code to support PCI bus devices.
776 depends on !4xx && !CPM2 && 8xx
779 Say Y here if you have a system based on a Motorola 8xx-series
780 embedded processor with a QSPAN PCI interface, otherwise say N.
784 depends on PCI && 8260
785 select PPC_INDIRECT_PCI
789 bool " Enable workaround for MPC826x erratum PCI 9"
790 depends on PCI_8260 && !ADS8272
794 prompt " IDMA channel for PCI 9 workaround"
797 config 8260_PCI9_IDMA1
800 config 8260_PCI9_IDMA2
803 config 8260_PCI9_IDMA3
806 config 8260_PCI9_IDMA4
811 source "drivers/pci/Kconfig"
813 source "drivers/pcmcia/Kconfig"
815 source "drivers/pci/hotplug/Kconfig"
819 menu "Advanced setup"
822 config ADVANCED_OPTIONS
823 bool "Prompt for advanced kernel configuration options"
825 This option will enable prompting for a variety of advanced kernel
826 configuration options. These options can cause the kernel to not
827 work if they are set incorrectly, but can be used to optimize certain
828 aspects of kernel memory management.
830 Unless you know what you are doing, say N here.
832 comment "Default settings for advanced configuration options are used"
833 depends on !ADVANCED_OPTIONS
835 config HIGHMEM_START_BOOL
836 bool "Set high memory pool address"
837 depends on ADVANCED_OPTIONS && HIGHMEM
839 This option allows you to set the base address of the kernel virtual
840 area used to map high memory pages. This can be useful in
841 optimizing the layout of kernel virtual memory.
843 Say N here unless you know what you are doing.
846 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
849 config LOWMEM_SIZE_BOOL
850 bool "Set maximum low memory"
851 depends on ADVANCED_OPTIONS
853 This option allows you to set the maximum amount of memory which
854 will be used as "low memory", that is, memory which the kernel can
855 access directly, without having to set up a kernel virtual mapping.
856 This can be useful in optimizing the layout of kernel virtual
859 Say N here unless you know what you are doing.
862 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
865 config KERNEL_START_BOOL
866 bool "Set custom kernel base address"
867 depends on ADVANCED_OPTIONS
869 This option allows you to set the kernel virtual address at which
870 the kernel will map low memory (the kernel image will be linked at
871 this address). This can be useful in optimizing the virtual memory
872 layout of the system.
874 Say N here unless you know what you are doing.
877 hex "Virtual address of kernel base" if KERNEL_START_BOOL
880 config TASK_SIZE_BOOL
881 bool "Set custom user task size"
882 depends on ADVANCED_OPTIONS
884 This option allows you to set the amount of virtual address space
885 allocated to user tasks. This can be useful in optimizing the
886 virtual memory layout of the system.
888 Say N here unless you know what you are doing.
891 hex "Size of user task space" if TASK_SIZE_BOOL
894 config CONSISTENT_START_BOOL
895 bool "Set custom consistent memory pool address"
896 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
898 This option allows you to set the base virtual address
899 of the the consistent memory pool. This pool of virtual
900 memory is used to make consistent memory allocations.
902 config CONSISTENT_START
903 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
904 default "0xff100000" if NOT_COHERENT_CACHE
906 config CONSISTENT_SIZE_BOOL
907 bool "Set custom consistent memory pool size"
908 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
910 This option allows you to set the size of the the
911 consistent memory pool. This pool of virtual memory
912 is used to make consistent memory allocations.
914 config CONSISTENT_SIZE
915 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
916 default "0x00200000" if NOT_COHERENT_CACHE
918 config BOOT_LOAD_BOOL
919 bool "Set the boot link/load address"
920 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
922 This option allows you to set the initial load address of the zImage
923 or zImage.initrd file. This can be useful if you are on a board
924 which has a small amount of memory.
926 Say N here unless you know what you are doing.
929 hex "Link/load address for booting" if BOOT_LOAD_BOOL
930 default "0x00400000" if 40x || 8xx || 8260
931 default "0x01000000" if 44x
935 bool "Pinned Kernel TLBs (860 ONLY)"
936 depends on ADVANCED_OPTIONS && 8xx
942 default "0xc000000000000000"
947 source "drivers/Kconfig"
951 # XXX source "arch/ppc/8xx_io/Kconfig"
953 # XXX source "arch/ppc/8260_io/Kconfig"
955 source "arch/powerpc/platforms/iseries/Kconfig"
959 menu "Instrumentation Support"
960 depends on EXPERIMENTAL
962 source "arch/powerpc/oprofile/Kconfig"
965 bool "Kprobes (EXPERIMENTAL)"
966 depends on PPC64 && EXPERIMENTAL && MODULES
968 Kprobes allows you to trap at almost any kernel address and
969 execute a callback function. register_kprobe() establishes
970 a probepoint and specifies the callback. Kprobes is useful
971 for kernel debugging, non-intrusive instrumentation and testing.
972 If in doubt, say "N".
975 source "arch/powerpc/Kconfig.debug"
977 source "security/Kconfig"
981 depends on COMPAT && KEYS
984 source "crypto/Kconfig"