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
74 menu "Processor support"
76 prompt "Processor Type"
84 There are four families of PowerPC chips supported. The more common
85 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
86 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
87 embedded versions (403 and 405) and the high end 64 bit Power
88 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
90 Unless you are building a kernel for one of the embedded processor
91 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
92 Note that the kernel runs in 32-bit mode even on 64-bit chips.
101 bool "Freescale 83xx"
113 bool "Freescale e200"
116 bool "Freescale e500"
120 bool "Optimize for POWER4"
124 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
125 The resulting binary will not work on POWER3 or RS64 processors
126 when compiled with binutils 2.15 or later.
131 default y if !POWER4_ONLY
143 depends on E200 || E500
148 depends on E200 || E500
153 depends on 44x || E500
155 default y if E500 && PHYS_64BIT
158 bool 'Large physical address support' if E500
159 depends on 44x || E500
162 This option enables kernel support for larger than 32-bit physical
163 addresses. This features is not be available on all e500 cores.
165 If in doubt, say N here.
168 bool "AltiVec Support"
169 depends on 6xx || POWER4
171 This option enables kernel support for the Altivec extensions to the
172 PowerPC processor. The kernel currently supports saving and restoring
173 altivec registers, and turning on the 'altivec enable' bit so user
174 processes can execute altivec instructions.
176 This option is only usefully if you have a processor that supports
177 altivec (G4, otherwise known as 74xx series), but does not have
178 any affect on a non-altivec cpu (it does, however add code to the
181 If in doubt, say Y here.
185 depends on E200 || E500
187 This option enables kernel support for the Signal Processing
188 Extensions (SPE) to the PowerPC processor. The kernel currently
189 supports saving and restoring SPE registers, and turning on the
190 'spe enable' bit so user processes can execute SPE instructions.
192 This option is only useful if you have a processor that supports
193 SPE (e500, otherwise known as 85xx series), but does not have any
194 effect on a non-spe cpu (it does, however add code to the kernel).
196 If in doubt, say Y here.
200 depends on 6xx || POWER3 || POWER4 || PPC64
203 config PPC_STD_MMU_32
205 depends on PPC_STD_MMU && PPC32
208 depends on PPC_STD_MMU
209 bool "Symmetric multi-processing support"
211 This enables support for systems with more than one CPU. If you have
212 a system with only one CPU, say N. If you have a system with more
213 than one CPU, say Y. Note that the kernel does not currently
214 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
215 since they have inadequate hardware support for multiprocessor
218 If you say N here, the kernel will run on single and multiprocessor
219 machines, but will use only one CPU of a multiprocessor machine. If
220 you say Y here, the kernel will run on single-processor machines.
221 On a single-processor machine, the kernel will run faster if you say
224 If you don't know what to do here, say N.
227 int "Maximum number of CPUs (2-128)"
230 default "32" if PPC64
233 config NOT_COHERENT_CACHE
235 depends on 4xx || 8xx || E200
239 source "init/Kconfig"
241 menu "Platform support"
242 depends on PPC64 || 6xx
245 prompt "Machine type"
246 default PPC_MULTIPLATFORM
248 config PPC_MULTIPLATFORM
249 bool "Generic desktop/server/laptop"
251 Select this option if configuring for an IBM pSeries or
252 RS/6000 machine, an Apple machine, or a PReP, CHRP,
253 Maple or Cell-based machine.
256 bool "IBM Legacy iSeries"
260 bool "Embedded 6xx/7xx/7xxx-based board"
261 depends on PPC32 && BROKEN
265 depends on PPC32 && BROKEN
267 Select APUS if configuring for a PowerUP Amiga.
268 More information is available at:
269 <http://linux-apus.sourceforge.net/>.
273 depends on PPC_MULTIPLATFORM && PPC64
274 bool " IBM pSeries & new (POWER5-based) iSeries"
277 select RTAS_ERROR_LOGGING
281 bool " Common Hardware Reference Platform (CHRP) based machines"
282 depends on PPC_MULTIPLATFORM && PPC32
284 select PPC_INDIRECT_PCI
290 bool " Apple PowerMac based machines"
291 depends on PPC_MULTIPLATFORM
292 select PPC_INDIRECT_PCI if PPC32
293 select PPC_MPC106 if PPC32
298 depends on PPC_PMAC && POWER4
300 select MPIC_BROKEN_U3
301 select GENERIC_TBSYNC
305 bool " PowerPC Reference Platform (PReP) based machines"
306 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
308 select PPC_INDIRECT_PCI
312 depends on PPC_MULTIPLATFORM && PPC64
313 bool " Maple 970FX Evaluation Board"
315 select MPIC_BROKEN_U3
316 select GENERIC_TBSYNC
319 This option enables support for the Maple 970FX Evaluation Board.
320 For more informations, refer to <http://www.970eval.com>
323 bool " Cell Broadband Processor Architecture"
324 depends on PPC_MULTIPLATFORM && PPC64
332 depends on PPC_PSERIES
338 depends on PPC_MULTIPLATFORM && PPC64
342 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
350 config RTAS_ERROR_LOGGING
356 bool "Proc interface to RTAS"
361 tristate "Firmware flash interface"
362 depends on PPC64 && RTAS_PROC
368 config MPIC_BROKEN_U3
379 bool "kernel crash dumps (EXPERIMENTAL)"
380 depends on PPC_MULTIPLATFORM
381 depends on EXPERIMENTAL
383 Build a kernel suitable for use as a kdump capture kernel.
384 The kernel will be linked at a different address than normal, and
385 so can only be used for Kdump.
387 Don't change this unless you know what you are doing.
390 depends on PPC_PSERIES || PPC_ISERIES
395 depends on PPC_PSERIES
396 bool "Support for GX bus based adapters"
398 Bus device driver for GX bus based adapters.
404 config GENERIC_TBSYNC
406 default y if CONFIG_PPC32 && CONFIG_SMP
409 source "drivers/cpufreq/Kconfig"
412 bool "Support for Apple PowerBooks"
413 depends on CPU_FREQ && ADB_PMU && PPC32
414 select CPU_FREQ_TABLE
416 This adds support for frequency switching on Apple PowerBooks,
417 this currently includes some models of iBook & Titanium
420 config CPU_FREQ_PMAC64
421 bool "Support for some Apple G5s"
422 depends on CPU_FREQ && PMAC_SMU && PPC64
423 select CPU_FREQ_TABLE
425 This adds support for frequency switching on Apple iMac G5,
426 and some of the more recent desktop G5 machines as well.
428 config PPC601_SYNC_FIX
429 bool "Workarounds for PPC601 bugs"
430 depends on 6xx && (PPC_PREP || PPC_PMAC)
432 Some versions of the PPC601 (the first PowerPC chip) have bugs which
433 mean that extra synchronization instructions are required near
434 certain instructions, typically those that make major changes to the
435 CPU state. These extra instructions reduce performance slightly.
436 If you say N here, these extra instructions will not be included,
437 resulting in a kernel which will run faster but may not run at all
438 on some systems with the PPC601 chip.
440 If in doubt, say Y here.
443 bool "Thermal Management Support"
446 G3 and G4 processors have an on-chip temperature sensor called the
447 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
448 temperature within 2-4 degrees Celsius. This option shows the current
449 on-die temperature in /proc/cpuinfo if the cpu supports it.
451 Unfortunately, on some chip revisions, this sensor is very inaccurate
452 and in some cases, does not work at all, so don't assume the cpu
453 temp is actually what /proc/cpuinfo says it is.
456 bool "Interrupt driven TAU driver (DANGEROUS)"
459 The TAU supports an interrupt driven mode which causes an interrupt
460 whenever the temperature goes out of range. This is the fastest way
461 to get notified the temp has exceeded a range. With this option off,
462 a timer is used to re-check the temperature periodically.
464 However, on some cpus it appears that the TAU interrupt hardware
465 is buggy and can cause a situation which would lead unexplained hard
468 Unless you are extending the TAU driver, or enjoy kernel/hardware
469 debugging, leave this option off.
472 bool "Average high and low temp"
475 The TAU hardware can compare the temperature to an upper and lower
476 bound. The default behavior is to show both the upper and lower
477 bound in /proc/cpuinfo. If the range is large, the temperature is
478 either changing a lot, or the TAU hardware is broken (likely on some
479 G4's). If the range is small (around 4 degrees), the temperature is
480 relatively stable. If you say Y here, a single temperature value,
481 halfway between the upper and lower bounds, will be reported in
484 If in doubt, say N here.
487 source arch/powerpc/platforms/embedded6xx/Kconfig
488 source arch/powerpc/platforms/4xx/Kconfig
489 source arch/powerpc/platforms/85xx/Kconfig
490 source arch/powerpc/platforms/8xx/Kconfig
491 source arch/powerpc/platforms/cell/Kconfig
493 menu "Kernel options"
496 bool "High memory support"
499 source kernel/Kconfig.hz
500 source kernel/Kconfig.preempt
501 source "fs/Kconfig.binfmt"
503 # We optimistically allocate largepages from the VM, so make the limit
504 # large enough (16MB). This badly named config option is actually
506 config FORCE_MAX_ZONEORDER
509 default "9" if PPC_64K_PAGES
512 config MATH_EMULATION
513 bool "Math emulation"
514 depends on 4xx || 8xx || E200 || E500
516 Some PowerPC chips designed for embedded applications do not have
517 a floating-point unit and therefore do not implement the
518 floating-point instructions in the PowerPC instruction set. If you
519 say Y here, the kernel will include code to emulate a floating-point
520 unit, which will allow programs that use floating-point
524 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
525 depends on EXPERIMENTAL && PPC64
528 Cause IO segments sent to a device for DMA to be merged virtually
529 by the IOMMU when they happen to have been allocated contiguously.
530 This doesn't add pressure to the IOMMU allocator. However, some
531 drivers don't support getting large merged segments coming back
532 from *_map_sg(). Say Y if you know the drivers you are using are
533 properly handling this case.
536 bool "Support for enabling/disabling CPUs"
537 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
539 Say Y here to be able to disable and re-enable individual
540 CPUs at runtime on SMP machines.
542 Say N if you are unsure.
545 bool "kexec system call (EXPERIMENTAL)"
546 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
548 kexec is a system call that implements the ability to shutdown your
549 current kernel, and to start another kernel. It is like a reboot
550 but it is indepedent of the system firmware. And like a reboot
551 you can start any kernel with it, not just Linux.
553 The name comes from the similiarity to the exec system call.
555 It is an ongoing process to be certain the hardware in a machine
556 is properly shutdown, so do not be surprised if this code does not
557 initially work for you. It may help to enable device hotplugging
558 support. As of this writing the exact hardware interface is
559 strongly in flux, so no good recommendation can be made.
563 depends on 8xx || 8260
567 bool "PC PS/2 style Keyboard"
568 depends on 4xx || CPM2
571 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
572 default y if PPC_PREP
575 bool "Distribute interrupts on all CPUs by default"
576 depends on SMP && !MV64360
578 This option gives the kernel permission to distribute IRQs across
579 multiple CPUs. Saying N here will route all IRQs to the first
580 CPU. Generally saying Y is safe, although some problems have been
581 reported with SMP Power Macintoshes with this option enabled.
583 source "arch/powerpc/platforms/pseries/Kconfig"
588 default y if SMP && PPC_PSERIES
590 config ARCH_SELECT_MEMORY_MODEL
594 config ARCH_FLATMEM_ENABLE
596 depends on (PPC64 && !NUMA) || PPC32
598 config ARCH_SPARSEMEM_ENABLE
602 config ARCH_SPARSEMEM_DEFAULT
604 depends on SMP && PPC_PSERIES
608 config HAVE_ARCH_EARLY_PFN_TO_NID
610 depends on NEED_MULTIPLE_NODES
612 config ARCH_MEMORY_PROBE
614 depends on MEMORY_HOTPLUG
620 This option changes the kernel logical page size to 64k. On machines
621 without processor support for 64k pages, the kernel will simulate
622 them by loading each individual 4k page on demand transparently,
623 while on hardware with such support, it will be used to map
624 normal application pages.
627 bool "SMT (Hyperthreading) scheduler support"
628 depends on PPC64 && SMP
631 SMT scheduler support improves the CPU scheduler's decision making
632 when dealing with POWER5 cpus at a cost of slightly increased
633 overhead in some places. If unsure say N here.
635 config PROC_DEVICETREE
636 bool "Support for device tree in /proc"
639 This option adds a device-tree directory under /proc which contains
640 an image of the device tree that the kernel copies from Open
641 Firmware or other boot firmware. If unsure, say Y here.
643 source "arch/powerpc/platforms/prep/Kconfig"
646 bool "Default bootloader kernel arguments"
647 depends on !PPC_ISERIES
650 string "Initial kernel command string"
651 depends on CMDLINE_BOOL
652 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
654 On some platforms, there is currently no way for the boot loader to
655 pass arguments to the kernel. For these platforms, you can supply
656 some command-line options at build time by entering them here. In
657 most cases you will need to specify the root device here.
660 source kernel/power/Kconfig
664 bool "Enable seccomp to safely compute untrusted bytecode"
668 This kernel feature is useful for number crunching applications
669 that may need to compute untrusted bytecode during their
670 execution. By using pipes or other transports made available to
671 the process as file descriptors supporting the read/write
672 syscalls, it's possible to isolate those applications in
673 their own address space using seccomp. Once seccomp is
674 enabled via /proc/<pid>/seccomp, it cannot be disabled
675 and the task is only allowed to execute a few safe syscalls
676 defined by each seccomp mode.
678 If unsure, say Y. Only embedded should say N here.
689 bool "Support for ISA-bus hardware"
690 depends on PPC_PREP || PPC_CHRP
693 Find out whether you have ISA slots on your motherboard. ISA is the
694 name of a bus system, i.e. the way the CPU talks to the other stuff
695 inside your box. If you have an Apple machine, say N here; if you
696 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
697 you have an embedded board, consult your board documentation.
699 config GENERIC_ISA_DMA
701 depends on PPC64 || POWER4 || 6xx && !CPM2
709 config PPC_INDIRECT_PCI
712 default y if 40x || 44x || 85xx || 83xx
721 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
726 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
727 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
728 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
729 default PCI_QSPAN if !4xx && !CPM2 && 8xx
731 Find out whether your system includes a PCI bus. PCI is the name of
732 a bus system, i.e. the way the CPU talks to the other stuff inside
733 your box. If you say Y here, the kernel will include drivers and
734 infrastructure code to support PCI bus devices.
741 bool " Supprt for 2nd PCI host controller"
742 depends on PCI && MPC834x
743 default y if MPC834x_SYS
747 depends on !4xx && !CPM2 && 8xx
750 Say Y here if you have a system based on a Motorola 8xx-series
751 embedded processor with a QSPAN PCI interface, otherwise say N.
755 depends on PCI && 8260
756 select PPC_INDIRECT_PCI
760 bool " Enable workaround for MPC826x erratum PCI 9"
761 depends on PCI_8260 && !ADS8272
765 prompt " IDMA channel for PCI 9 workaround"
768 config 8260_PCI9_IDMA1
771 config 8260_PCI9_IDMA2
774 config 8260_PCI9_IDMA3
777 config 8260_PCI9_IDMA4
782 source "drivers/pci/Kconfig"
784 source "drivers/pcmcia/Kconfig"
786 source "drivers/pci/hotplug/Kconfig"
790 menu "Advanced setup"
793 config ADVANCED_OPTIONS
794 bool "Prompt for advanced kernel configuration options"
796 This option will enable prompting for a variety of advanced kernel
797 configuration options. These options can cause the kernel to not
798 work if they are set incorrectly, but can be used to optimize certain
799 aspects of kernel memory management.
801 Unless you know what you are doing, say N here.
803 comment "Default settings for advanced configuration options are used"
804 depends on !ADVANCED_OPTIONS
806 config HIGHMEM_START_BOOL
807 bool "Set high memory pool address"
808 depends on ADVANCED_OPTIONS && HIGHMEM
810 This option allows you to set the base address of the kernel virtual
811 area used to map high memory pages. This can be useful in
812 optimizing the layout of kernel virtual memory.
814 Say N here unless you know what you are doing.
817 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
820 config LOWMEM_SIZE_BOOL
821 bool "Set maximum low memory"
822 depends on ADVANCED_OPTIONS
824 This option allows you to set the maximum amount of memory which
825 will be used as "low memory", that is, memory which the kernel can
826 access directly, without having to set up a kernel virtual mapping.
827 This can be useful in optimizing the layout of kernel virtual
830 Say N here unless you know what you are doing.
833 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
836 config KERNEL_START_BOOL
837 bool "Set custom kernel base address"
838 depends on ADVANCED_OPTIONS
840 This option allows you to set the kernel virtual address at which
841 the kernel will map low memory (the kernel image will be linked at
842 this address). This can be useful in optimizing the virtual memory
843 layout of the system.
845 Say N here unless you know what you are doing.
848 hex "Virtual address of kernel base" if KERNEL_START_BOOL
851 config TASK_SIZE_BOOL
852 bool "Set custom user task size"
853 depends on ADVANCED_OPTIONS
855 This option allows you to set the amount of virtual address space
856 allocated to user tasks. This can be useful in optimizing the
857 virtual memory layout of the system.
859 Say N here unless you know what you are doing.
862 hex "Size of user task space" if TASK_SIZE_BOOL
865 config CONSISTENT_START_BOOL
866 bool "Set custom consistent memory pool address"
867 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
869 This option allows you to set the base virtual address
870 of the the consistent memory pool. This pool of virtual
871 memory is used to make consistent memory allocations.
873 config CONSISTENT_START
874 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
875 default "0xff100000" if NOT_COHERENT_CACHE
877 config CONSISTENT_SIZE_BOOL
878 bool "Set custom consistent memory pool size"
879 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
881 This option allows you to set the size of the the
882 consistent memory pool. This pool of virtual memory
883 is used to make consistent memory allocations.
885 config CONSISTENT_SIZE
886 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
887 default "0x00200000" if NOT_COHERENT_CACHE
889 config BOOT_LOAD_BOOL
890 bool "Set the boot link/load address"
891 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
893 This option allows you to set the initial load address of the zImage
894 or zImage.initrd file. This can be useful if you are on a board
895 which has a small amount of memory.
897 Say N here unless you know what you are doing.
900 hex "Link/load address for booting" if BOOT_LOAD_BOOL
901 default "0x00400000" if 40x || 8xx || 8260
902 default "0x01000000" if 44x
906 bool "Pinned Kernel TLBs (860 ONLY)"
907 depends on ADVANCED_OPTIONS && 8xx
913 default "0xc000000000000000"
918 source "drivers/Kconfig"
922 # XXX source "arch/ppc/8xx_io/Kconfig"
924 # XXX source "arch/ppc/8260_io/Kconfig"
926 source "arch/powerpc/platforms/iseries/Kconfig"
930 menu "Instrumentation Support"
931 depends on EXPERIMENTAL
933 source "arch/powerpc/oprofile/Kconfig"
936 bool "Kprobes (EXPERIMENTAL)"
939 Kprobes allows you to trap at almost any kernel address and
940 execute a callback function. register_kprobe() establishes
941 a probepoint and specifies the callback. Kprobes is useful
942 for kernel debugging, non-intrusive instrumentation and testing.
943 If in doubt, say "N".
946 source "arch/powerpc/Kconfig.debug"
948 source "security/Kconfig"
952 depends on COMPAT && KEYS
955 source "crypto/Kconfig"