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
284 bool " Common Hardware Reference Platform (CHRP) based machines"
285 depends on PPC_MULTIPLATFORM && PPC32
287 select PPC_INDIRECT_PCI
293 bool " Apple PowerMac based machines"
294 depends on PPC_MULTIPLATFORM
295 select PPC_INDIRECT_PCI if PPC32
296 select PPC_MPC106 if PPC32
301 depends on PPC_PMAC && POWER4
303 select GENERIC_TBSYNC
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
318 select GENERIC_TBSYNC
321 This option enables support for the Maple 970FX Evaluation Board.
322 For more informations, refer to <http://www.970eval.com>
325 bool " Cell Broadband Processor Architecture"
326 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
360 bool "Proc interface to RTAS"
365 tristate "Firmware flash interface"
366 depends on PPC64 && RTAS_PROC
372 config MPIC_BROKEN_U3
383 depends on PPC_PSERIES || PPC_ISERIES
391 config GENERIC_TBSYNC
393 default y if CONFIG_PPC32 && CONFIG_SMP
396 source "drivers/cpufreq/Kconfig"
399 bool "Support for Apple PowerBooks"
400 depends on CPU_FREQ && ADB_PMU && PPC32
401 select CPU_FREQ_TABLE
403 This adds support for frequency switching on Apple PowerBooks,
404 this currently includes some models of iBook & Titanium
407 config PPC601_SYNC_FIX
408 bool "Workarounds for PPC601 bugs"
409 depends on 6xx && (PPC_PREP || PPC_PMAC)
411 Some versions of the PPC601 (the first PowerPC chip) have bugs which
412 mean that extra synchronization instructions are required near
413 certain instructions, typically those that make major changes to the
414 CPU state. These extra instructions reduce performance slightly.
415 If you say N here, these extra instructions will not be included,
416 resulting in a kernel which will run faster but may not run at all
417 on some systems with the PPC601 chip.
419 If in doubt, say Y here.
422 bool "Thermal Management Support"
425 G3 and G4 processors have an on-chip temperature sensor called the
426 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
427 temperature within 2-4 degrees Celsius. This option shows the current
428 on-die temperature in /proc/cpuinfo if the cpu supports it.
430 Unfortunately, on some chip revisions, this sensor is very inaccurate
431 and in some cases, does not work at all, so don't assume the cpu
432 temp is actually what /proc/cpuinfo says it is.
435 bool "Interrupt driven TAU driver (DANGEROUS)"
438 The TAU supports an interrupt driven mode which causes an interrupt
439 whenever the temperature goes out of range. This is the fastest way
440 to get notified the temp has exceeded a range. With this option off,
441 a timer is used to re-check the temperature periodically.
443 However, on some cpus it appears that the TAU interrupt hardware
444 is buggy and can cause a situation which would lead unexplained hard
447 Unless you are extending the TAU driver, or enjoy kernel/hardware
448 debugging, leave this option off.
451 bool "Average high and low temp"
454 The TAU hardware can compare the temperature to an upper and lower
455 bound. The default behavior is to show both the upper and lower
456 bound in /proc/cpuinfo. If the range is large, the temperature is
457 either changing a lot, or the TAU hardware is broken (likely on some
458 G4's). If the range is small (around 4 degrees), the temperature is
459 relatively stable. If you say Y here, a single temperature value,
460 halfway between the upper and lower bounds, will be reported in
463 If in doubt, say N here.
466 source arch/powerpc/platforms/embedded6xx/Kconfig
467 source arch/powerpc/platforms/4xx/Kconfig
468 source arch/powerpc/platforms/85xx/Kconfig
469 source arch/powerpc/platforms/8xx/Kconfig
471 menu "Kernel options"
474 bool "High memory support"
477 source kernel/Kconfig.hz
478 source kernel/Kconfig.preempt
479 source "fs/Kconfig.binfmt"
481 # We optimistically allocate largepages from the VM, so make the limit
482 # large enough (16MB). This badly named config option is actually
484 config FORCE_MAX_ZONEORDER
489 config MATH_EMULATION
490 bool "Math emulation"
491 depends on 4xx || 8xx || E200 || E500
493 Some PowerPC chips designed for embedded applications do not have
494 a floating-point unit and therefore do not implement the
495 floating-point instructions in the PowerPC instruction set. If you
496 say Y here, the kernel will include code to emulate a floating-point
497 unit, which will allow programs that use floating-point
501 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
502 depends on EXPERIMENTAL && PPC64
505 Cause IO segments sent to a device for DMA to be merged virtually
506 by the IOMMU when they happen to have been allocated contiguously.
507 This doesn't add pressure to the IOMMU allocator. However, some
508 drivers don't support getting large merged segments coming back
509 from *_map_sg(). Say Y if you know the drivers you are using are
510 properly handling this case.
513 bool "Support for enabling/disabling CPUs"
514 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
516 Say Y here to be able to disable and re-enable individual
517 CPUs at runtime on SMP machines.
519 Say N if you are unsure.
522 bool "kexec system call (EXPERIMENTAL)"
523 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
525 kexec is a system call that implements the ability to shutdown your
526 current kernel, and to start another kernel. It is like a reboot
527 but it is indepedent of the system firmware. And like a reboot
528 you can start any kernel with it, not just Linux.
530 The name comes from the similiarity to the exec system call.
532 It is an ongoing process to be certain the hardware in a machine
533 is properly shutdown, so do not be surprised if this code does not
534 initially work for you. It may help to enable device hotplugging
535 support. As of this writing the exact hardware interface is
536 strongly in flux, so no good recommendation can be made.
540 depends on 8xx || 8260
544 bool "PC PS/2 style Keyboard"
545 depends on 4xx || CPM2
548 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
549 default y if PPC_PREP
552 bool "Distribute interrupts on all CPUs by default"
553 depends on SMP && !MV64360
555 This option gives the kernel permission to distribute IRQs across
556 multiple CPUs. Saying N here will route all IRQs to the first
557 CPU. Generally saying Y is safe, although some problems have been
558 reported with SMP Power Macintoshes with this option enabled.
560 source "arch/powerpc/platforms/pseries/Kconfig"
565 default y if SMP && PPC_PSERIES
567 config ARCH_SELECT_MEMORY_MODEL
571 config ARCH_FLATMEM_ENABLE
573 depends on PPC64 && !NUMA
575 config ARCH_DISCONTIGMEM_ENABLE
577 depends on SMP && PPC_PSERIES
579 config ARCH_DISCONTIGMEM_DEFAULT
581 depends on ARCH_DISCONTIGMEM_ENABLE
583 config ARCH_SPARSEMEM_ENABLE
585 depends on ARCH_DISCONTIGMEM_ENABLE
589 config HAVE_ARCH_EARLY_PFN_TO_NID
591 depends on NEED_MULTIPLE_NODES
593 # Some NUMA nodes have memory ranges that span
594 # other nodes. Even though a pfn is valid and
595 # between a node's start and end pfns, it may not
596 # reside on that node.
598 # This is a relatively temporary hack that should
599 # be able to go away when sparsemem is fully in
602 config NODES_SPAN_OTHER_NODES
604 depends on NEED_MULTIPLE_NODES
607 bool "SMT (Hyperthreading) scheduler support"
608 depends on PPC64 && SMP
611 SMT scheduler support improves the CPU scheduler's decision making
612 when dealing with POWER5 cpus at a cost of slightly increased
613 overhead in some places. If unsure say N here.
615 config PROC_DEVICETREE
616 bool "Support for device tree in /proc"
619 This option adds a device-tree directory under /proc which contains
620 an image of the device tree that the kernel copies from Open
621 Firmware or other boot firmware. If unsure, say Y here.
623 source "arch/powerpc/platforms/prep/Kconfig"
626 bool "Default bootloader kernel arguments"
627 depends on !PPC_ISERIES
630 string "Initial kernel command string"
631 depends on CMDLINE_BOOL
632 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
634 On some platforms, there is currently no way for the boot loader to
635 pass arguments to the kernel. For these platforms, you can supply
636 some command-line options at build time by entering them here. In
637 most cases you will need to specify the root device here.
640 source kernel/power/Kconfig
644 bool "Enable seccomp to safely compute untrusted bytecode"
648 This kernel feature is useful for number crunching applications
649 that may need to compute untrusted bytecode during their
650 execution. By using pipes or other transports made available to
651 the process as file descriptors supporting the read/write
652 syscalls, it's possible to isolate those applications in
653 their own address space using seccomp. Once seccomp is
654 enabled via /proc/<pid>/seccomp, it cannot be disabled
655 and the task is only allowed to execute a few safe syscalls
656 defined by each seccomp mode.
658 If unsure, say Y. Only embedded should say N here.
669 bool "Support for ISA-bus hardware"
670 depends on PPC_PREP || PPC_CHRP
673 Find out whether you have ISA slots on your motherboard. ISA is the
674 name of a bus system, i.e. the way the CPU talks to the other stuff
675 inside your box. If you have an Apple machine, say N here; if you
676 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
677 you have an embedded board, consult your board documentation.
679 config GENERIC_ISA_DMA
681 depends on PPC64 || POWER4 || 6xx && !CPM2
689 config PPC_INDIRECT_PCI
692 default y if 40x || 44x || 85xx || 83xx
701 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
706 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
707 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
708 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
709 default PCI_QSPAN if !4xx && !CPM2 && 8xx
711 Find out whether your system includes a PCI bus. PCI is the name of
712 a bus system, i.e. the way the CPU talks to the other stuff inside
713 your box. If you say Y here, the kernel will include drivers and
714 infrastructure code to support PCI bus devices.
721 bool " Supprt for 2nd PCI host controller"
722 depends on PCI && MPC834x
723 default y if MPC834x_SYS
727 depends on !4xx && !CPM2 && 8xx
730 Say Y here if you have a system based on a Motorola 8xx-series
731 embedded processor with a QSPAN PCI interface, otherwise say N.
735 depends on PCI && 8260
736 select PPC_INDIRECT_PCI
740 bool " Enable workaround for MPC826x erratum PCI 9"
741 depends on PCI_8260 && !ADS8272
745 prompt " IDMA channel for PCI 9 workaround"
748 config 8260_PCI9_IDMA1
751 config 8260_PCI9_IDMA2
754 config 8260_PCI9_IDMA3
757 config 8260_PCI9_IDMA4
762 source "drivers/pci/Kconfig"
764 source "drivers/pcmcia/Kconfig"
766 source "drivers/pci/hotplug/Kconfig"
770 menu "Advanced setup"
773 config ADVANCED_OPTIONS
774 bool "Prompt for advanced kernel configuration options"
776 This option will enable prompting for a variety of advanced kernel
777 configuration options. These options can cause the kernel to not
778 work if they are set incorrectly, but can be used to optimize certain
779 aspects of kernel memory management.
781 Unless you know what you are doing, say N here.
783 comment "Default settings for advanced configuration options are used"
784 depends on !ADVANCED_OPTIONS
786 config HIGHMEM_START_BOOL
787 bool "Set high memory pool address"
788 depends on ADVANCED_OPTIONS && HIGHMEM
790 This option allows you to set the base address of the kernel virtual
791 area used to map high memory pages. This can be useful in
792 optimizing the layout of kernel virtual memory.
794 Say N here unless you know what you are doing.
797 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
800 config LOWMEM_SIZE_BOOL
801 bool "Set maximum low memory"
802 depends on ADVANCED_OPTIONS
804 This option allows you to set the maximum amount of memory which
805 will be used as "low memory", that is, memory which the kernel can
806 access directly, without having to set up a kernel virtual mapping.
807 This can be useful in optimizing the layout of kernel virtual
810 Say N here unless you know what you are doing.
813 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
816 config KERNEL_START_BOOL
817 bool "Set custom kernel base address"
818 depends on ADVANCED_OPTIONS
820 This option allows you to set the kernel virtual address at which
821 the kernel will map low memory (the kernel image will be linked at
822 this address). This can be useful in optimizing the virtual memory
823 layout of the system.
825 Say N here unless you know what you are doing.
828 hex "Virtual address of kernel base" if KERNEL_START_BOOL
831 config TASK_SIZE_BOOL
832 bool "Set custom user task size"
833 depends on ADVANCED_OPTIONS
835 This option allows you to set the amount of virtual address space
836 allocated to user tasks. This can be useful in optimizing the
837 virtual memory layout of the system.
839 Say N here unless you know what you are doing.
842 hex "Size of user task space" if TASK_SIZE_BOOL
845 config CONSISTENT_START_BOOL
846 bool "Set custom consistent memory pool address"
847 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
849 This option allows you to set the base virtual address
850 of the the consistent memory pool. This pool of virtual
851 memory is used to make consistent memory allocations.
853 config CONSISTENT_START
854 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
855 default "0xff100000" if NOT_COHERENT_CACHE
857 config CONSISTENT_SIZE_BOOL
858 bool "Set custom consistent memory pool size"
859 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
861 This option allows you to set the size of the the
862 consistent memory pool. This pool of virtual memory
863 is used to make consistent memory allocations.
865 config CONSISTENT_SIZE
866 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
867 default "0x00200000" if NOT_COHERENT_CACHE
869 config BOOT_LOAD_BOOL
870 bool "Set the boot link/load address"
871 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
873 This option allows you to set the initial load address of the zImage
874 or zImage.initrd file. This can be useful if you are on a board
875 which has a small amount of memory.
877 Say N here unless you know what you are doing.
880 hex "Link/load address for booting" if BOOT_LOAD_BOOL
881 default "0x00400000" if 40x || 8xx || 8260
882 default "0x01000000" if 44x
886 bool "Pinned Kernel TLBs (860 ONLY)"
887 depends on ADVANCED_OPTIONS && 8xx
893 default "0xc000000000000000"
898 source "drivers/Kconfig"
902 # XXX source "arch/ppc/8xx_io/Kconfig"
904 # XXX source "arch/ppc/8260_io/Kconfig"
906 source "arch/powerpc/platforms/iseries/Kconfig"
910 source "arch/powerpc/oprofile/Kconfig"
912 source "arch/powerpc/Kconfig.debug"
914 source "security/Kconfig"
918 depends on COMPAT && KEYS
921 source "crypto/Kconfig"