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
306 bool " PowerPC Reference Platform (PReP) based machines"
307 depends on PPC_MULTIPLATFORM && PPC32
309 select PPC_INDIRECT_PCI
313 depends on PPC_MULTIPLATFORM && PPC64
314 bool " Maple 970FX Evaluation Board"
316 select MPIC_BROKEN_U3
319 This option enables support for the Maple 970FX Evaluation Board.
320 For more informations, refer to <http://www.970eval.com>
323 bool " Broadband Processor Architecture"
324 depends on PPC_MULTIPLATFORM && PPC64
329 depends on PPC_MULTIPLATFORM # for now
333 depends on PPC_PSERIES
339 depends on PPC_MULTIPLATFORM && PPC64
343 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
351 config RTAS_ERROR_LOGGING
356 config MPIC_BROKEN_U3
367 depends on PPC_PSERIES || PPC_ISERIES
375 source "drivers/cpufreq/Kconfig"
378 bool "Support for Apple PowerBooks"
379 depends on CPU_FREQ && ADB_PMU && PPC32
380 select CPU_FREQ_TABLE
382 This adds support for frequency switching on Apple PowerBooks,
383 this currently includes some models of iBook & Titanium
386 config PPC601_SYNC_FIX
387 bool "Workarounds for PPC601 bugs"
388 depends on 6xx && (PPC_PREP || PPC_PMAC)
390 Some versions of the PPC601 (the first PowerPC chip) have bugs which
391 mean that extra synchronization instructions are required near
392 certain instructions, typically those that make major changes to the
393 CPU state. These extra instructions reduce performance slightly.
394 If you say N here, these extra instructions will not be included,
395 resulting in a kernel which will run faster but may not run at all
396 on some systems with the PPC601 chip.
398 If in doubt, say Y here.
401 bool "Thermal Management Support"
404 G3 and G4 processors have an on-chip temperature sensor called the
405 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
406 temperature within 2-4 degrees Celsius. This option shows the current
407 on-die temperature in /proc/cpuinfo if the cpu supports it.
409 Unfortunately, on some chip revisions, this sensor is very inaccurate
410 and in some cases, does not work at all, so don't assume the cpu
411 temp is actually what /proc/cpuinfo says it is.
414 bool "Interrupt driven TAU driver (DANGEROUS)"
417 The TAU supports an interrupt driven mode which causes an interrupt
418 whenever the temperature goes out of range. This is the fastest way
419 to get notified the temp has exceeded a range. With this option off,
420 a timer is used to re-check the temperature periodically.
422 However, on some cpus it appears that the TAU interrupt hardware
423 is buggy and can cause a situation which would lead unexplained hard
426 Unless you are extending the TAU driver, or enjoy kernel/hardware
427 debugging, leave this option off.
430 bool "Average high and low temp"
433 The TAU hardware can compare the temperature to an upper and lower
434 bound. The default behavior is to show both the upper and lower
435 bound in /proc/cpuinfo. If the range is large, the temperature is
436 either changing a lot, or the TAU hardware is broken (likely on some
437 G4's). If the range is small (around 4 degrees), the temperature is
438 relatively stable. If you say Y here, a single temperature value,
439 halfway between the upper and lower bounds, will be reported in
442 If in doubt, say N here.
445 source arch/powerpc/platforms/embedded6xx/Kconfig
446 source arch/powerpc/platforms/4xx/Kconfig
447 source arch/powerpc/platforms/85xx/Kconfig
448 source arch/powerpc/platforms/8xx/Kconfig
450 menu "Kernel options"
453 bool "High memory support"
456 source kernel/Kconfig.hz
457 source kernel/Kconfig.preempt
458 source "fs/Kconfig.binfmt"
460 # We optimistically allocate largepages from the VM, so make the limit
461 # large enough (16MB). This badly named config option is actually
463 config FORCE_MAX_ZONEORDER
468 config MATH_EMULATION
469 bool "Math emulation"
470 depends on 4xx || 8xx || E200 || E500
472 Some PowerPC chips designed for embedded applications do not have
473 a floating-point unit and therefore do not implement the
474 floating-point instructions in the PowerPC instruction set. If you
475 say Y here, the kernel will include code to emulate a floating-point
476 unit, which will allow programs that use floating-point
480 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
481 depends on EXPERIMENTAL && PPC64
484 Cause IO segments sent to a device for DMA to be merged virtually
485 by the IOMMU when they happen to have been allocated contiguously.
486 This doesn't add pressure to the IOMMU allocator. However, some
487 drivers don't support getting large merged segments coming back
488 from *_map_sg(). Say Y if you know the drivers you are using are
489 properly handling this case.
492 bool "Support for enabling/disabling CPUs"
493 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
495 Say Y here to be able to disable and re-enable individual
496 CPUs at runtime on SMP machines.
498 Say N if you are unsure.
501 bool "kexec system call (EXPERIMENTAL)"
502 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
504 kexec is a system call that implements the ability to shutdown your
505 current kernel, and to start another kernel. It is like a reboot
506 but it is indepedent of the system firmware. And like a reboot
507 you can start any kernel with it, not just Linux.
509 The name comes from the similiarity to the exec system call.
511 It is an ongoing process to be certain the hardware in a machine
512 is properly shutdown, so do not be surprised if this code does not
513 initially work for you. It may help to enable device hotplugging
514 support. As of this writing the exact hardware interface is
515 strongly in flux, so no good recommendation can be made.
519 depends on 8xx || 8260
523 bool "PC PS/2 style Keyboard"
524 depends on 4xx || CPM2
527 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
528 default y if PPC_PREP
531 bool "Distribute interrupts on all CPUs by default"
532 depends on SMP && !MV64360
534 This option gives the kernel permission to distribute IRQs across
535 multiple CPUs. Saying N here will route all IRQs to the first
536 CPU. Generally saying Y is safe, although some problems have been
537 reported with SMP Power Macintoshes with this option enabled.
539 source "arch/powerpc/platforms/pseries/Kconfig"
541 config ARCH_SELECT_MEMORY_MODEL
545 config ARCH_FLATMEM_ENABLE
547 depends on PPC64 && !NUMA
549 config ARCH_DISCONTIGMEM_ENABLE
551 depends on SMP && PPC_PSERIES
553 config ARCH_DISCONTIGMEM_DEFAULT
555 depends on ARCH_DISCONTIGMEM_ENABLE
557 config ARCH_FLATMEM_ENABLE
561 config ARCH_SPARSEMEM_ENABLE
563 depends on ARCH_DISCONTIGMEM_ENABLE
567 config HAVE_ARCH_EARLY_PFN_TO_NID
569 depends on NEED_MULTIPLE_NODES
571 # Some NUMA nodes have memory ranges that span
572 # other nodes. Even though a pfn is valid and
573 # between a node's start and end pfns, it may not
574 # reside on that node.
576 # This is a relatively temporary hack that should
577 # be able to go away when sparsemem is fully in
580 config NODES_SPAN_OTHER_NODES
582 depends on NEED_MULTIPLE_NODES
586 default y if DISCONTIGMEM || SPARSEMEM
589 bool "SMT (Hyperthreading) scheduler support"
590 depends on PPC64 && SMP
593 SMT scheduler support improves the CPU scheduler's decision making
594 when dealing with POWER5 cpus at a cost of slightly increased
595 overhead in some places. If unsure say N here.
597 config PROC_DEVICETREE
598 bool "Support for device tree in /proc"
601 This option adds a device-tree directory under /proc which contains
602 an image of the device tree that the kernel copies from Open
603 Firmware or other boot firmware. If unsure, say Y here.
605 source "arch/powerpc/platforms/prep/Kconfig"
608 bool "Default bootloader kernel arguments"
609 depends on !PPC_ISERIES
612 string "Initial kernel command string"
613 depends on CMDLINE_BOOL
614 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
616 On some platforms, there is currently no way for the boot loader to
617 pass arguments to the kernel. For these platforms, you can supply
618 some command-line options at build time by entering them here. In
619 most cases you will need to specify the root device here.
622 source kernel/power/Kconfig
626 bool "Enable seccomp to safely compute untrusted bytecode"
630 This kernel feature is useful for number crunching applications
631 that may need to compute untrusted bytecode during their
632 execution. By using pipes or other transports made available to
633 the process as file descriptors supporting the read/write
634 syscalls, it's possible to isolate those applications in
635 their own address space using seccomp. Once seccomp is
636 enabled via /proc/<pid>/seccomp, it cannot be disabled
637 and the task is only allowed to execute a few safe syscalls
638 defined by each seccomp mode.
640 If unsure, say Y. Only embedded should say N here.
651 bool "Support for ISA-bus hardware"
652 depends on PPC_PREP || PPC_CHRP
655 Find out whether you have ISA slots on your motherboard. ISA is the
656 name of a bus system, i.e. the way the CPU talks to the other stuff
657 inside your box. If you have an Apple machine, say N here; if you
658 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
659 you have an embedded board, consult your board documentation.
661 config GENERIC_ISA_DMA
663 depends on PPC64 || POWER4 || 6xx && !CPM2
671 config PPC_INDIRECT_PCI
674 default y if 40x || 44x || 85xx || 83xx
683 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
688 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
689 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
690 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
691 default PCI_QSPAN if !4xx && !CPM2 && 8xx
693 Find out whether your system includes a PCI bus. PCI is the name of
694 a bus system, i.e. the way the CPU talks to the other stuff inside
695 your box. If you say Y here, the kernel will include drivers and
696 infrastructure code to support PCI bus devices.
703 bool " Supprt for 2nd PCI host controller"
704 depends on PCI && MPC834x
705 default y if MPC834x_SYS
709 depends on !4xx && !CPM2 && 8xx
712 Say Y here if you have a system based on a Motorola 8xx-series
713 embedded processor with a QSPAN PCI interface, otherwise say N.
717 depends on PCI && 8260
718 select PPC_INDIRECT_PCI
722 bool " Enable workaround for MPC826x erratum PCI 9"
723 depends on PCI_8260 && !ADS8272
727 prompt " IDMA channel for PCI 9 workaround"
730 config 8260_PCI9_IDMA1
733 config 8260_PCI9_IDMA2
736 config 8260_PCI9_IDMA3
739 config 8260_PCI9_IDMA4
744 source "drivers/pci/Kconfig"
746 source "drivers/pcmcia/Kconfig"
748 source "drivers/pci/hotplug/Kconfig"
752 menu "Advanced setup"
755 config ADVANCED_OPTIONS
756 bool "Prompt for advanced kernel configuration options"
758 This option will enable prompting for a variety of advanced kernel
759 configuration options. These options can cause the kernel to not
760 work if they are set incorrectly, but can be used to optimize certain
761 aspects of kernel memory management.
763 Unless you know what you are doing, say N here.
765 comment "Default settings for advanced configuration options are used"
766 depends on !ADVANCED_OPTIONS
768 config HIGHMEM_START_BOOL
769 bool "Set high memory pool address"
770 depends on ADVANCED_OPTIONS && HIGHMEM
772 This option allows you to set the base address of the kernel virtual
773 area used to map high memory pages. This can be useful in
774 optimizing the layout of kernel virtual memory.
776 Say N here unless you know what you are doing.
779 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
782 config LOWMEM_SIZE_BOOL
783 bool "Set maximum low memory"
784 depends on ADVANCED_OPTIONS
786 This option allows you to set the maximum amount of memory which
787 will be used as "low memory", that is, memory which the kernel can
788 access directly, without having to set up a kernel virtual mapping.
789 This can be useful in optimizing the layout of kernel virtual
792 Say N here unless you know what you are doing.
795 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
798 config KERNEL_START_BOOL
799 bool "Set custom kernel base address"
800 depends on ADVANCED_OPTIONS
802 This option allows you to set the kernel virtual address at which
803 the kernel will map low memory (the kernel image will be linked at
804 this address). This can be useful in optimizing the virtual memory
805 layout of the system.
807 Say N here unless you know what you are doing.
810 hex "Virtual address of kernel base" if KERNEL_START_BOOL
813 config TASK_SIZE_BOOL
814 bool "Set custom user task size"
815 depends on ADVANCED_OPTIONS
817 This option allows you to set the amount of virtual address space
818 allocated to user tasks. This can be useful in optimizing the
819 virtual memory layout of the system.
821 Say N here unless you know what you are doing.
824 hex "Size of user task space" if TASK_SIZE_BOOL
827 config CONSISTENT_START_BOOL
828 bool "Set custom consistent memory pool address"
829 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
831 This option allows you to set the base virtual address
832 of the the consistent memory pool. This pool of virtual
833 memory is used to make consistent memory allocations.
835 config CONSISTENT_START
836 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
837 default "0xff100000" if NOT_COHERENT_CACHE
839 config CONSISTENT_SIZE_BOOL
840 bool "Set custom consistent memory pool size"
841 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
843 This option allows you to set the size of the the
844 consistent memory pool. This pool of virtual memory
845 is used to make consistent memory allocations.
847 config CONSISTENT_SIZE
848 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
849 default "0x00200000" if NOT_COHERENT_CACHE
851 config BOOT_LOAD_BOOL
852 bool "Set the boot link/load address"
853 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
855 This option allows you to set the initial load address of the zImage
856 or zImage.initrd file. This can be useful if you are on a board
857 which has a small amount of memory.
859 Say N here unless you know what you are doing.
862 hex "Link/load address for booting" if BOOT_LOAD_BOOL
863 default "0x00400000" if 40x || 8xx || 8260
864 default "0x01000000" if 44x
868 bool "Pinned Kernel TLBs (860 ONLY)"
869 depends on ADVANCED_OPTIONS && 8xx
875 default "0xc000000000000000"
880 source "drivers/Kconfig"
884 # XXX source "arch/ppc/8xx_io/Kconfig"
886 # XXX source "arch/ppc/8260_io/Kconfig"
888 source "arch/powerpc/platforms/iseries/Kconfig"
892 source "arch/powerpc/oprofile/Kconfig"
894 source "arch/powerpc/Kconfig.debug"
896 source "security/Kconfig"
900 depends on COMPAT && KEYS
903 source "crypto/Kconfig"