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
332 depends on PPC_MULTIPLATFORM # for now
336 depends on PPC_PSERIES
342 depends on PPC_MULTIPLATFORM && PPC64
346 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
354 config RTAS_ERROR_LOGGING
368 config MPIC_BROKEN_U3
379 depends on PPC_PSERIES || PPC_ISERIES
387 source "drivers/cpufreq/Kconfig"
390 bool "Support for Apple PowerBooks"
391 depends on CPU_FREQ && ADB_PMU && PPC32
392 select CPU_FREQ_TABLE
394 This adds support for frequency switching on Apple PowerBooks,
395 this currently includes some models of iBook & Titanium
398 config PPC601_SYNC_FIX
399 bool "Workarounds for PPC601 bugs"
400 depends on 6xx && (PPC_PREP || PPC_PMAC)
402 Some versions of the PPC601 (the first PowerPC chip) have bugs which
403 mean that extra synchronization instructions are required near
404 certain instructions, typically those that make major changes to the
405 CPU state. These extra instructions reduce performance slightly.
406 If you say N here, these extra instructions will not be included,
407 resulting in a kernel which will run faster but may not run at all
408 on some systems with the PPC601 chip.
410 If in doubt, say Y here.
413 bool "Thermal Management Support"
416 G3 and G4 processors have an on-chip temperature sensor called the
417 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
418 temperature within 2-4 degrees Celsius. This option shows the current
419 on-die temperature in /proc/cpuinfo if the cpu supports it.
421 Unfortunately, on some chip revisions, this sensor is very inaccurate
422 and in some cases, does not work at all, so don't assume the cpu
423 temp is actually what /proc/cpuinfo says it is.
426 bool "Interrupt driven TAU driver (DANGEROUS)"
429 The TAU supports an interrupt driven mode which causes an interrupt
430 whenever the temperature goes out of range. This is the fastest way
431 to get notified the temp has exceeded a range. With this option off,
432 a timer is used to re-check the temperature periodically.
434 However, on some cpus it appears that the TAU interrupt hardware
435 is buggy and can cause a situation which would lead unexplained hard
438 Unless you are extending the TAU driver, or enjoy kernel/hardware
439 debugging, leave this option off.
442 bool "Average high and low temp"
445 The TAU hardware can compare the temperature to an upper and lower
446 bound. The default behavior is to show both the upper and lower
447 bound in /proc/cpuinfo. If the range is large, the temperature is
448 either changing a lot, or the TAU hardware is broken (likely on some
449 G4's). If the range is small (around 4 degrees), the temperature is
450 relatively stable. If you say Y here, a single temperature value,
451 halfway between the upper and lower bounds, will be reported in
454 If in doubt, say N here.
457 source arch/powerpc/platforms/embedded6xx/Kconfig
458 source arch/powerpc/platforms/4xx/Kconfig
459 source arch/powerpc/platforms/85xx/Kconfig
460 source arch/powerpc/platforms/8xx/Kconfig
462 menu "Kernel options"
465 bool "High memory support"
468 source kernel/Kconfig.hz
469 source kernel/Kconfig.preempt
470 source "fs/Kconfig.binfmt"
472 # We optimistically allocate largepages from the VM, so make the limit
473 # large enough (16MB). This badly named config option is actually
475 config FORCE_MAX_ZONEORDER
480 config MATH_EMULATION
481 bool "Math emulation"
482 depends on 4xx || 8xx || E200 || E500
484 Some PowerPC chips designed for embedded applications do not have
485 a floating-point unit and therefore do not implement the
486 floating-point instructions in the PowerPC instruction set. If you
487 say Y here, the kernel will include code to emulate a floating-point
488 unit, which will allow programs that use floating-point
492 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
493 depends on EXPERIMENTAL && PPC64
496 Cause IO segments sent to a device for DMA to be merged virtually
497 by the IOMMU when they happen to have been allocated contiguously.
498 This doesn't add pressure to the IOMMU allocator. However, some
499 drivers don't support getting large merged segments coming back
500 from *_map_sg(). Say Y if you know the drivers you are using are
501 properly handling this case.
504 bool "Support for enabling/disabling CPUs"
505 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
507 Say Y here to be able to disable and re-enable individual
508 CPUs at runtime on SMP machines.
510 Say N if you are unsure.
513 bool "kexec system call (EXPERIMENTAL)"
514 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
516 kexec is a system call that implements the ability to shutdown your
517 current kernel, and to start another kernel. It is like a reboot
518 but it is indepedent of the system firmware. And like a reboot
519 you can start any kernel with it, not just Linux.
521 The name comes from the similiarity to the exec system call.
523 It is an ongoing process to be certain the hardware in a machine
524 is properly shutdown, so do not be surprised if this code does not
525 initially work for you. It may help to enable device hotplugging
526 support. As of this writing the exact hardware interface is
527 strongly in flux, so no good recommendation can be made.
531 depends on 8xx || 8260
535 bool "PC PS/2 style Keyboard"
536 depends on 4xx || CPM2
539 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
540 default y if PPC_PREP
543 bool "Distribute interrupts on all CPUs by default"
544 depends on SMP && !MV64360
546 This option gives the kernel permission to distribute IRQs across
547 multiple CPUs. Saying N here will route all IRQs to the first
548 CPU. Generally saying Y is safe, although some problems have been
549 reported with SMP Power Macintoshes with this option enabled.
551 source "arch/powerpc/platforms/pseries/Kconfig"
556 default y if SMP && PPC_PSERIES
558 config ARCH_SELECT_MEMORY_MODEL
562 config ARCH_FLATMEM_ENABLE
564 depends on PPC64 && !NUMA
566 config ARCH_DISCONTIGMEM_ENABLE
568 depends on SMP && PPC_PSERIES
570 config ARCH_DISCONTIGMEM_DEFAULT
572 depends on ARCH_DISCONTIGMEM_ENABLE
574 config ARCH_SPARSEMEM_ENABLE
576 depends on ARCH_DISCONTIGMEM_ENABLE
580 config HAVE_ARCH_EARLY_PFN_TO_NID
582 depends on NEED_MULTIPLE_NODES
584 # Some NUMA nodes have memory ranges that span
585 # other nodes. Even though a pfn is valid and
586 # between a node's start and end pfns, it may not
587 # reside on that node.
589 # This is a relatively temporary hack that should
590 # be able to go away when sparsemem is fully in
593 config NODES_SPAN_OTHER_NODES
595 depends on NEED_MULTIPLE_NODES
598 bool "SMT (Hyperthreading) scheduler support"
599 depends on PPC64 && SMP
602 SMT scheduler support improves the CPU scheduler's decision making
603 when dealing with POWER5 cpus at a cost of slightly increased
604 overhead in some places. If unsure say N here.
606 config PROC_DEVICETREE
607 bool "Support for device tree in /proc"
610 This option adds a device-tree directory under /proc which contains
611 an image of the device tree that the kernel copies from Open
612 Firmware or other boot firmware. If unsure, say Y here.
614 source "arch/powerpc/platforms/prep/Kconfig"
617 bool "Default bootloader kernel arguments"
618 depends on !PPC_ISERIES
621 string "Initial kernel command string"
622 depends on CMDLINE_BOOL
623 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
625 On some platforms, there is currently no way for the boot loader to
626 pass arguments to the kernel. For these platforms, you can supply
627 some command-line options at build time by entering them here. In
628 most cases you will need to specify the root device here.
631 source kernel/power/Kconfig
635 bool "Enable seccomp to safely compute untrusted bytecode"
639 This kernel feature is useful for number crunching applications
640 that may need to compute untrusted bytecode during their
641 execution. By using pipes or other transports made available to
642 the process as file descriptors supporting the read/write
643 syscalls, it's possible to isolate those applications in
644 their own address space using seccomp. Once seccomp is
645 enabled via /proc/<pid>/seccomp, it cannot be disabled
646 and the task is only allowed to execute a few safe syscalls
647 defined by each seccomp mode.
649 If unsure, say Y. Only embedded should say N here.
660 bool "Support for ISA-bus hardware"
661 depends on PPC_PREP || PPC_CHRP
664 Find out whether you have ISA slots on your motherboard. ISA is the
665 name of a bus system, i.e. the way the CPU talks to the other stuff
666 inside your box. If you have an Apple machine, say N here; if you
667 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
668 you have an embedded board, consult your board documentation.
670 config GENERIC_ISA_DMA
672 depends on PPC64 || POWER4 || 6xx && !CPM2
680 config PPC_INDIRECT_PCI
683 default y if 40x || 44x || 85xx || 83xx
692 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
697 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
698 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
699 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
700 default PCI_QSPAN if !4xx && !CPM2 && 8xx
702 Find out whether your system includes a PCI bus. PCI is the name of
703 a bus system, i.e. the way the CPU talks to the other stuff inside
704 your box. If you say Y here, the kernel will include drivers and
705 infrastructure code to support PCI bus devices.
712 bool " Supprt for 2nd PCI host controller"
713 depends on PCI && MPC834x
714 default y if MPC834x_SYS
718 depends on !4xx && !CPM2 && 8xx
721 Say Y here if you have a system based on a Motorola 8xx-series
722 embedded processor with a QSPAN PCI interface, otherwise say N.
726 depends on PCI && 8260
727 select PPC_INDIRECT_PCI
731 bool " Enable workaround for MPC826x erratum PCI 9"
732 depends on PCI_8260 && !ADS8272
736 prompt " IDMA channel for PCI 9 workaround"
739 config 8260_PCI9_IDMA1
742 config 8260_PCI9_IDMA2
745 config 8260_PCI9_IDMA3
748 config 8260_PCI9_IDMA4
753 source "drivers/pci/Kconfig"
755 source "drivers/pcmcia/Kconfig"
757 source "drivers/pci/hotplug/Kconfig"
761 menu "Advanced setup"
764 config ADVANCED_OPTIONS
765 bool "Prompt for advanced kernel configuration options"
767 This option will enable prompting for a variety of advanced kernel
768 configuration options. These options can cause the kernel to not
769 work if they are set incorrectly, but can be used to optimize certain
770 aspects of kernel memory management.
772 Unless you know what you are doing, say N here.
774 comment "Default settings for advanced configuration options are used"
775 depends on !ADVANCED_OPTIONS
777 config HIGHMEM_START_BOOL
778 bool "Set high memory pool address"
779 depends on ADVANCED_OPTIONS && HIGHMEM
781 This option allows you to set the base address of the kernel virtual
782 area used to map high memory pages. This can be useful in
783 optimizing the layout of kernel virtual memory.
785 Say N here unless you know what you are doing.
788 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
791 config LOWMEM_SIZE_BOOL
792 bool "Set maximum low memory"
793 depends on ADVANCED_OPTIONS
795 This option allows you to set the maximum amount of memory which
796 will be used as "low memory", that is, memory which the kernel can
797 access directly, without having to set up a kernel virtual mapping.
798 This can be useful in optimizing the layout of kernel virtual
801 Say N here unless you know what you are doing.
804 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
807 config KERNEL_START_BOOL
808 bool "Set custom kernel base address"
809 depends on ADVANCED_OPTIONS
811 This option allows you to set the kernel virtual address at which
812 the kernel will map low memory (the kernel image will be linked at
813 this address). This can be useful in optimizing the virtual memory
814 layout of the system.
816 Say N here unless you know what you are doing.
819 hex "Virtual address of kernel base" if KERNEL_START_BOOL
822 config TASK_SIZE_BOOL
823 bool "Set custom user task size"
824 depends on ADVANCED_OPTIONS
826 This option allows you to set the amount of virtual address space
827 allocated to user tasks. This can be useful in optimizing the
828 virtual memory layout of the system.
830 Say N here unless you know what you are doing.
833 hex "Size of user task space" if TASK_SIZE_BOOL
836 config CONSISTENT_START_BOOL
837 bool "Set custom consistent memory pool address"
838 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
840 This option allows you to set the base virtual address
841 of the the consistent memory pool. This pool of virtual
842 memory is used to make consistent memory allocations.
844 config CONSISTENT_START
845 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
846 default "0xff100000" if NOT_COHERENT_CACHE
848 config CONSISTENT_SIZE_BOOL
849 bool "Set custom consistent memory pool size"
850 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
852 This option allows you to set the size of the the
853 consistent memory pool. This pool of virtual memory
854 is used to make consistent memory allocations.
856 config CONSISTENT_SIZE
857 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
858 default "0x00200000" if NOT_COHERENT_CACHE
860 config BOOT_LOAD_BOOL
861 bool "Set the boot link/load address"
862 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
864 This option allows you to set the initial load address of the zImage
865 or zImage.initrd file. This can be useful if you are on a board
866 which has a small amount of memory.
868 Say N here unless you know what you are doing.
871 hex "Link/load address for booting" if BOOT_LOAD_BOOL
872 default "0x00400000" if 40x || 8xx || 8260
873 default "0x01000000" if 44x
877 bool "Pinned Kernel TLBs (860 ONLY)"
878 depends on ADVANCED_OPTIONS && 8xx
884 default "0xc000000000000000"
889 source "drivers/Kconfig"
893 # XXX source "arch/ppc/8xx_io/Kconfig"
895 # XXX source "arch/ppc/8260_io/Kconfig"
897 source "arch/powerpc/platforms/iseries/Kconfig"
901 source "arch/powerpc/oprofile/Kconfig"
903 source "arch/powerpc/Kconfig.debug"
905 source "security/Kconfig"
909 depends on COMPAT && KEYS
912 source "crypto/Kconfig"