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
32 config GENERIC_HARDIRQS
36 config RWSEM_GENERIC_SPINLOCK
39 config RWSEM_XCHGADD_ALGORITHM
43 config GENERIC_CALIBRATE_DELAY
61 depends on COMPAT && SYSVIPC
64 # All PPC32s use generic nvram driver through ppc_md
69 config SCHED_NO_NO_OMIT_FRAME_POINTER
73 config ARCH_MAY_HAVE_PC_FDC
77 menu "Processor support"
79 prompt "Processor Type"
87 There are four families of PowerPC chips supported. The more common
88 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
89 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
90 embedded versions (403 and 405) and the high end 64 bit Power
91 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
93 Unless you are building a kernel for one of the embedded processor
94 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
95 Note that the kernel runs in 32-bit mode even on 64-bit chips.
101 bool "Freescale 82xx"
104 bool "Freescale 83xx"
116 bool "Freescale e200"
119 bool "Freescale e500"
123 bool "Optimize for POWER4"
127 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
128 The resulting binary will not work on POWER3 or RS64 processors
129 when compiled with binutils 2.15 or later.
134 default y if !POWER4_ONLY
146 depends on E200 || E500
151 depends on E200 || E500
156 depends on 44x || E500
158 default y if E500 && PHYS_64BIT
161 bool 'Large physical address support' if E500
162 depends on 44x || E500
165 This option enables kernel support for larger than 32-bit physical
166 addresses. This features is not be available on all e500 cores.
168 If in doubt, say N here.
171 bool "AltiVec Support"
172 depends on 6xx || POWER4
174 This option enables kernel support for the Altivec extensions to the
175 PowerPC processor. The kernel currently supports saving and restoring
176 altivec registers, and turning on the 'altivec enable' bit so user
177 processes can execute altivec instructions.
179 This option is only usefully if you have a processor that supports
180 altivec (G4, otherwise known as 74xx series), but does not have
181 any affect on a non-altivec cpu (it does, however add code to the
184 If in doubt, say Y here.
188 depends on E200 || E500
190 This option enables kernel support for the Signal Processing
191 Extensions (SPE) to the PowerPC processor. The kernel currently
192 supports saving and restoring SPE registers, and turning on the
193 'spe enable' bit so user processes can execute SPE instructions.
195 This option is only useful if you have a processor that supports
196 SPE (e500, otherwise known as 85xx series), but does not have any
197 effect on a non-spe cpu (it does, however add code to the kernel).
199 If in doubt, say Y here.
203 depends on 6xx || POWER3 || POWER4 || PPC64
206 config PPC_STD_MMU_32
208 depends on PPC_STD_MMU && PPC32
211 depends on PPC_STD_MMU
212 bool "Symmetric multi-processing support"
214 This enables support for systems with more than one CPU. If you have
215 a system with only one CPU, say N. If you have a system with more
216 than one CPU, say Y. Note that the kernel does not currently
217 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
218 since they have inadequate hardware support for multiprocessor
221 If you say N here, the kernel will run on single and multiprocessor
222 machines, but will use only one CPU of a multiprocessor machine. If
223 you say Y here, the kernel will run on single-processor machines.
224 On a single-processor machine, the kernel will run faster if you say
227 If you don't know what to do here, say N.
230 int "Maximum number of CPUs (2-32)"
233 default "32" if PPC64
236 config NOT_COHERENT_CACHE
238 depends on 4xx || 8xx || E200
242 source "init/Kconfig"
244 menu "Platform support"
245 depends on PPC64 || 6xx
248 prompt "Machine type"
249 default PPC_MULTIPLATFORM
251 config PPC_MULTIPLATFORM
252 bool "Generic desktop/server/laptop"
254 Select this option if configuring for an IBM pSeries or
255 RS/6000 machine, an Apple machine, or a PReP, CHRP,
256 Maple or Cell-based machine.
259 bool "IBM Legacy iSeries"
263 bool "Embedded 6xx/7xx/7xxx-based board"
268 depends on PPC32 && BROKEN
270 Select APUS if configuring for a PowerUP Amiga.
271 More information is available at:
272 <http://linux-apus.sourceforge.net/>.
276 depends on PPC_MULTIPLATFORM && PPC64
277 bool " IBM pSeries & new (POWER5-based) iSeries"
280 select RTAS_ERROR_LOGGING
285 bool " Common Hardware Reference Platform (CHRP) based machines"
286 depends on PPC_MULTIPLATFORM && PPC32
288 select PPC_INDIRECT_PCI
294 bool " Apple PowerMac based machines"
295 depends on PPC_MULTIPLATFORM
296 select PPC_INDIRECT_PCI if PPC32
297 select PPC_MPC106 if PPC32
302 depends on PPC_PMAC && POWER4
307 bool " PowerPC Reference Platform (PReP) based machines"
308 depends on PPC_MULTIPLATFORM && PPC32
310 select PPC_INDIRECT_PCI
314 depends on PPC_MULTIPLATFORM && PPC64
315 bool " Maple 970FX Evaluation Board"
317 select MPIC_BROKEN_U3
320 This option enables support for the Maple 970FX Evaluation Board.
321 For more informations, refer to <http://www.970eval.com>
324 bool " Cell Broadband Processor Architecture"
325 depends on PPC_MULTIPLATFORM && PPC64
331 depends on PPC_MULTIPLATFORM # for now
335 depends on PPC_PSERIES
341 depends on PPC_MULTIPLATFORM && PPC64
345 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
353 config RTAS_ERROR_LOGGING
363 config MPIC_BROKEN_U3
374 depends on PPC_PSERIES || PPC_ISERIES
382 source "drivers/cpufreq/Kconfig"
385 bool "Support for Apple PowerBooks"
386 depends on CPU_FREQ && ADB_PMU && PPC32
387 select CPU_FREQ_TABLE
389 This adds support for frequency switching on Apple PowerBooks,
390 this currently includes some models of iBook & Titanium
393 config PPC601_SYNC_FIX
394 bool "Workarounds for PPC601 bugs"
395 depends on 6xx && (PPC_PREP || PPC_PMAC)
397 Some versions of the PPC601 (the first PowerPC chip) have bugs which
398 mean that extra synchronization instructions are required near
399 certain instructions, typically those that make major changes to the
400 CPU state. These extra instructions reduce performance slightly.
401 If you say N here, these extra instructions will not be included,
402 resulting in a kernel which will run faster but may not run at all
403 on some systems with the PPC601 chip.
405 If in doubt, say Y here.
408 bool "Thermal Management Support"
411 G3 and G4 processors have an on-chip temperature sensor called the
412 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
413 temperature within 2-4 degrees Celsius. This option shows the current
414 on-die temperature in /proc/cpuinfo if the cpu supports it.
416 Unfortunately, on some chip revisions, this sensor is very inaccurate
417 and in some cases, does not work at all, so don't assume the cpu
418 temp is actually what /proc/cpuinfo says it is.
421 bool "Interrupt driven TAU driver (DANGEROUS)"
424 The TAU supports an interrupt driven mode which causes an interrupt
425 whenever the temperature goes out of range. This is the fastest way
426 to get notified the temp has exceeded a range. With this option off,
427 a timer is used to re-check the temperature periodically.
429 However, on some cpus it appears that the TAU interrupt hardware
430 is buggy and can cause a situation which would lead unexplained hard
433 Unless you are extending the TAU driver, or enjoy kernel/hardware
434 debugging, leave this option off.
437 bool "Average high and low temp"
440 The TAU hardware can compare the temperature to an upper and lower
441 bound. The default behavior is to show both the upper and lower
442 bound in /proc/cpuinfo. If the range is large, the temperature is
443 either changing a lot, or the TAU hardware is broken (likely on some
444 G4's). If the range is small (around 4 degrees), the temperature is
445 relatively stable. If you say Y here, a single temperature value,
446 halfway between the upper and lower bounds, will be reported in
449 If in doubt, say N here.
452 source arch/powerpc/platforms/embedded6xx/Kconfig
453 source arch/powerpc/platforms/4xx/Kconfig
454 source arch/powerpc/platforms/85xx/Kconfig
455 source arch/powerpc/platforms/8xx/Kconfig
457 menu "Kernel options"
460 bool "High memory support"
463 source kernel/Kconfig.hz
464 source kernel/Kconfig.preempt
465 source "fs/Kconfig.binfmt"
467 # We optimistically allocate largepages from the VM, so make the limit
468 # large enough (16MB). This badly named config option is actually
470 config FORCE_MAX_ZONEORDER
475 config MATH_EMULATION
476 bool "Math emulation"
477 depends on 4xx || 8xx || E200 || E500
479 Some PowerPC chips designed for embedded applications do not have
480 a floating-point unit and therefore do not implement the
481 floating-point instructions in the PowerPC instruction set. If you
482 say Y here, the kernel will include code to emulate a floating-point
483 unit, which will allow programs that use floating-point
487 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
488 depends on EXPERIMENTAL && PPC64
491 Cause IO segments sent to a device for DMA to be merged virtually
492 by the IOMMU when they happen to have been allocated contiguously.
493 This doesn't add pressure to the IOMMU allocator. However, some
494 drivers don't support getting large merged segments coming back
495 from *_map_sg(). Say Y if you know the drivers you are using are
496 properly handling this case.
499 bool "Support for enabling/disabling CPUs"
500 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
502 Say Y here to be able to disable and re-enable individual
503 CPUs at runtime on SMP machines.
505 Say N if you are unsure.
508 bool "kexec system call (EXPERIMENTAL)"
509 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
511 kexec is a system call that implements the ability to shutdown your
512 current kernel, and to start another kernel. It is like a reboot
513 but it is indepedent of the system firmware. And like a reboot
514 you can start any kernel with it, not just Linux.
516 The name comes from the similiarity to the exec system call.
518 It is an ongoing process to be certain the hardware in a machine
519 is properly shutdown, so do not be surprised if this code does not
520 initially work for you. It may help to enable device hotplugging
521 support. As of this writing the exact hardware interface is
522 strongly in flux, so no good recommendation can be made.
526 depends on 8xx || 8260
530 bool "PC PS/2 style Keyboard"
531 depends on 4xx || CPM2
534 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
535 default y if PPC_PREP
538 bool "Distribute interrupts on all CPUs by default"
539 depends on SMP && !MV64360
541 This option gives the kernel permission to distribute IRQs across
542 multiple CPUs. Saying N here will route all IRQs to the first
543 CPU. Generally saying Y is safe, although some problems have been
544 reported with SMP Power Macintoshes with this option enabled.
546 source "arch/powerpc/platforms/pseries/Kconfig"
551 default y if SMP && PPC_PSERIES
553 config ARCH_SELECT_MEMORY_MODEL
557 config ARCH_FLATMEM_ENABLE
559 depends on PPC64 && !NUMA
561 config ARCH_DISCONTIGMEM_ENABLE
563 depends on SMP && PPC_PSERIES
565 config ARCH_DISCONTIGMEM_DEFAULT
567 depends on ARCH_DISCONTIGMEM_ENABLE
569 config ARCH_SPARSEMEM_ENABLE
571 depends on ARCH_DISCONTIGMEM_ENABLE
575 config HAVE_ARCH_EARLY_PFN_TO_NID
577 depends on NEED_MULTIPLE_NODES
579 # Some NUMA nodes have memory ranges that span
580 # other nodes. Even though a pfn is valid and
581 # between a node's start and end pfns, it may not
582 # reside on that node.
584 # This is a relatively temporary hack that should
585 # be able to go away when sparsemem is fully in
588 config NODES_SPAN_OTHER_NODES
590 depends on NEED_MULTIPLE_NODES
593 bool "SMT (Hyperthreading) scheduler support"
594 depends on PPC64 && SMP
597 SMT scheduler support improves the CPU scheduler's decision making
598 when dealing with POWER5 cpus at a cost of slightly increased
599 overhead in some places. If unsure say N here.
601 config PROC_DEVICETREE
602 bool "Support for device tree in /proc"
605 This option adds a device-tree directory under /proc which contains
606 an image of the device tree that the kernel copies from Open
607 Firmware or other boot firmware. If unsure, say Y here.
609 source "arch/powerpc/platforms/prep/Kconfig"
612 bool "Default bootloader kernel arguments"
613 depends on !PPC_ISERIES
616 string "Initial kernel command string"
617 depends on CMDLINE_BOOL
618 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
620 On some platforms, there is currently no way for the boot loader to
621 pass arguments to the kernel. For these platforms, you can supply
622 some command-line options at build time by entering them here. In
623 most cases you will need to specify the root device here.
626 source kernel/power/Kconfig
630 bool "Enable seccomp to safely compute untrusted bytecode"
634 This kernel feature is useful for number crunching applications
635 that may need to compute untrusted bytecode during their
636 execution. By using pipes or other transports made available to
637 the process as file descriptors supporting the read/write
638 syscalls, it's possible to isolate those applications in
639 their own address space using seccomp. Once seccomp is
640 enabled via /proc/<pid>/seccomp, it cannot be disabled
641 and the task is only allowed to execute a few safe syscalls
642 defined by each seccomp mode.
644 If unsure, say Y. Only embedded should say N here.
655 bool "Support for ISA-bus hardware"
656 depends on PPC_PREP || PPC_CHRP
659 Find out whether you have ISA slots on your motherboard. ISA is the
660 name of a bus system, i.e. the way the CPU talks to the other stuff
661 inside your box. If you have an Apple machine, say N here; if you
662 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
663 you have an embedded board, consult your board documentation.
665 config GENERIC_ISA_DMA
667 depends on PPC64 || POWER4 || 6xx && !CPM2
675 config PPC_INDIRECT_PCI
678 default y if 40x || 44x || 85xx || 83xx
687 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
692 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
693 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
694 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
695 default PCI_QSPAN if !4xx && !CPM2 && 8xx
697 Find out whether your system includes a PCI bus. PCI is the name of
698 a bus system, i.e. the way the CPU talks to the other stuff inside
699 your box. If you say Y here, the kernel will include drivers and
700 infrastructure code to support PCI bus devices.
707 bool " Supprt for 2nd PCI host controller"
708 depends on PCI && MPC834x
709 default y if MPC834x_SYS
713 depends on !4xx && !CPM2 && 8xx
716 Say Y here if you have a system based on a Motorola 8xx-series
717 embedded processor with a QSPAN PCI interface, otherwise say N.
721 depends on PCI && 8260
722 select PPC_INDIRECT_PCI
726 bool " Enable workaround for MPC826x erratum PCI 9"
727 depends on PCI_8260 && !ADS8272
731 prompt " IDMA channel for PCI 9 workaround"
734 config 8260_PCI9_IDMA1
737 config 8260_PCI9_IDMA2
740 config 8260_PCI9_IDMA3
743 config 8260_PCI9_IDMA4
748 source "drivers/pci/Kconfig"
750 source "drivers/pcmcia/Kconfig"
752 source "drivers/pci/hotplug/Kconfig"
756 menu "Advanced setup"
759 config ADVANCED_OPTIONS
760 bool "Prompt for advanced kernel configuration options"
762 This option will enable prompting for a variety of advanced kernel
763 configuration options. These options can cause the kernel to not
764 work if they are set incorrectly, but can be used to optimize certain
765 aspects of kernel memory management.
767 Unless you know what you are doing, say N here.
769 comment "Default settings for advanced configuration options are used"
770 depends on !ADVANCED_OPTIONS
772 config HIGHMEM_START_BOOL
773 bool "Set high memory pool address"
774 depends on ADVANCED_OPTIONS && HIGHMEM
776 This option allows you to set the base address of the kernel virtual
777 area used to map high memory pages. This can be useful in
778 optimizing the layout of kernel virtual memory.
780 Say N here unless you know what you are doing.
783 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
786 config LOWMEM_SIZE_BOOL
787 bool "Set maximum low memory"
788 depends on ADVANCED_OPTIONS
790 This option allows you to set the maximum amount of memory which
791 will be used as "low memory", that is, memory which the kernel can
792 access directly, without having to set up a kernel virtual mapping.
793 This can be useful in optimizing the layout of kernel virtual
796 Say N here unless you know what you are doing.
799 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
802 config KERNEL_START_BOOL
803 bool "Set custom kernel base address"
804 depends on ADVANCED_OPTIONS
806 This option allows you to set the kernel virtual address at which
807 the kernel will map low memory (the kernel image will be linked at
808 this address). This can be useful in optimizing the virtual memory
809 layout of the system.
811 Say N here unless you know what you are doing.
814 hex "Virtual address of kernel base" if KERNEL_START_BOOL
817 config TASK_SIZE_BOOL
818 bool "Set custom user task size"
819 depends on ADVANCED_OPTIONS
821 This option allows you to set the amount of virtual address space
822 allocated to user tasks. This can be useful in optimizing the
823 virtual memory layout of the system.
825 Say N here unless you know what you are doing.
828 hex "Size of user task space" if TASK_SIZE_BOOL
831 config CONSISTENT_START_BOOL
832 bool "Set custom consistent memory pool address"
833 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
835 This option allows you to set the base virtual address
836 of the the consistent memory pool. This pool of virtual
837 memory is used to make consistent memory allocations.
839 config CONSISTENT_START
840 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
841 default "0xff100000" if NOT_COHERENT_CACHE
843 config CONSISTENT_SIZE_BOOL
844 bool "Set custom consistent memory pool size"
845 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
847 This option allows you to set the size of the the
848 consistent memory pool. This pool of virtual memory
849 is used to make consistent memory allocations.
851 config CONSISTENT_SIZE
852 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
853 default "0x00200000" if NOT_COHERENT_CACHE
855 config BOOT_LOAD_BOOL
856 bool "Set the boot link/load address"
857 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
859 This option allows you to set the initial load address of the zImage
860 or zImage.initrd file. This can be useful if you are on a board
861 which has a small amount of memory.
863 Say N here unless you know what you are doing.
866 hex "Link/load address for booting" if BOOT_LOAD_BOOL
867 default "0x00400000" if 40x || 8xx || 8260
868 default "0x01000000" if 44x
872 bool "Pinned Kernel TLBs (860 ONLY)"
873 depends on ADVANCED_OPTIONS && 8xx
879 default "0xc000000000000000"
884 source "drivers/Kconfig"
888 # XXX source "arch/ppc/8xx_io/Kconfig"
890 # XXX source "arch/ppc/8260_io/Kconfig"
892 source "arch/powerpc/platforms/iseries/Kconfig"
896 source "arch/powerpc/oprofile/Kconfig"
898 source "arch/powerpc/Kconfig.debug"
900 source "security/Kconfig"
904 depends on COMPAT && KEYS
907 source "crypto/Kconfig"