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 GENERIC_TBSYNC
304 bool " PowerPC Reference Platform (PReP) based machines"
305 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
307 select PPC_INDIRECT_PCI
311 depends on PPC_MULTIPLATFORM && PPC64
312 bool " Maple 970FX Evaluation Board"
314 select MPIC_BROKEN_U3
315 select GENERIC_TBSYNC
318 This option enables support for the Maple 970FX Evaluation Board.
319 For more informations, refer to <http://www.970eval.com>
322 bool " Cell Broadband Processor Architecture"
323 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
357 bool "Proc interface to RTAS"
362 tristate "Firmware flash interface"
363 depends on PPC64 && RTAS_PROC
369 config MPIC_BROKEN_U3
380 depends on PPC_PSERIES || PPC_ISERIES
388 config GENERIC_TBSYNC
390 default y if CONFIG_PPC32 && CONFIG_SMP
393 source "drivers/cpufreq/Kconfig"
396 bool "Support for Apple PowerBooks"
397 depends on CPU_FREQ && ADB_PMU && PPC32
398 select CPU_FREQ_TABLE
400 This adds support for frequency switching on Apple PowerBooks,
401 this currently includes some models of iBook & Titanium
404 config CPU_FREQ_PMAC64
405 bool "Support for some Apple G5s"
406 depends on CPU_FREQ && PMAC_SMU && PPC64
407 select CPU_FREQ_TABLE
409 This adds support for frequency switching on Apple iMac G5,
410 and some of the more recent desktop G5 machines as well.
412 config PPC601_SYNC_FIX
413 bool "Workarounds for PPC601 bugs"
414 depends on 6xx && (PPC_PREP || PPC_PMAC)
416 Some versions of the PPC601 (the first PowerPC chip) have bugs which
417 mean that extra synchronization instructions are required near
418 certain instructions, typically those that make major changes to the
419 CPU state. These extra instructions reduce performance slightly.
420 If you say N here, these extra instructions will not be included,
421 resulting in a kernel which will run faster but may not run at all
422 on some systems with the PPC601 chip.
424 If in doubt, say Y here.
427 bool "Thermal Management Support"
430 G3 and G4 processors have an on-chip temperature sensor called the
431 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
432 temperature within 2-4 degrees Celsius. This option shows the current
433 on-die temperature in /proc/cpuinfo if the cpu supports it.
435 Unfortunately, on some chip revisions, this sensor is very inaccurate
436 and in some cases, does not work at all, so don't assume the cpu
437 temp is actually what /proc/cpuinfo says it is.
440 bool "Interrupt driven TAU driver (DANGEROUS)"
443 The TAU supports an interrupt driven mode which causes an interrupt
444 whenever the temperature goes out of range. This is the fastest way
445 to get notified the temp has exceeded a range. With this option off,
446 a timer is used to re-check the temperature periodically.
448 However, on some cpus it appears that the TAU interrupt hardware
449 is buggy and can cause a situation which would lead unexplained hard
452 Unless you are extending the TAU driver, or enjoy kernel/hardware
453 debugging, leave this option off.
456 bool "Average high and low temp"
459 The TAU hardware can compare the temperature to an upper and lower
460 bound. The default behavior is to show both the upper and lower
461 bound in /proc/cpuinfo. If the range is large, the temperature is
462 either changing a lot, or the TAU hardware is broken (likely on some
463 G4's). If the range is small (around 4 degrees), the temperature is
464 relatively stable. If you say Y here, a single temperature value,
465 halfway between the upper and lower bounds, will be reported in
468 If in doubt, say N here.
471 source arch/powerpc/platforms/embedded6xx/Kconfig
472 source arch/powerpc/platforms/4xx/Kconfig
473 source arch/powerpc/platforms/85xx/Kconfig
474 source arch/powerpc/platforms/8xx/Kconfig
476 menu "Kernel options"
479 bool "High memory support"
482 source kernel/Kconfig.hz
483 source kernel/Kconfig.preempt
484 source "fs/Kconfig.binfmt"
486 # We optimistically allocate largepages from the VM, so make the limit
487 # large enough (16MB). This badly named config option is actually
489 config FORCE_MAX_ZONEORDER
492 default "9" if PPC_64K_PAGES
495 config MATH_EMULATION
496 bool "Math emulation"
497 depends on 4xx || 8xx || E200 || E500
499 Some PowerPC chips designed for embedded applications do not have
500 a floating-point unit and therefore do not implement the
501 floating-point instructions in the PowerPC instruction set. If you
502 say Y here, the kernel will include code to emulate a floating-point
503 unit, which will allow programs that use floating-point
507 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
508 depends on EXPERIMENTAL && PPC64
511 Cause IO segments sent to a device for DMA to be merged virtually
512 by the IOMMU when they happen to have been allocated contiguously.
513 This doesn't add pressure to the IOMMU allocator. However, some
514 drivers don't support getting large merged segments coming back
515 from *_map_sg(). Say Y if you know the drivers you are using are
516 properly handling this case.
519 bool "Support for enabling/disabling CPUs"
520 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
522 Say Y here to be able to disable and re-enable individual
523 CPUs at runtime on SMP machines.
525 Say N if you are unsure.
528 bool "kexec system call (EXPERIMENTAL)"
529 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
531 kexec is a system call that implements the ability to shutdown your
532 current kernel, and to start another kernel. It is like a reboot
533 but it is indepedent of the system firmware. And like a reboot
534 you can start any kernel with it, not just Linux.
536 The name comes from the similiarity to the exec system call.
538 It is an ongoing process to be certain the hardware in a machine
539 is properly shutdown, so do not be surprised if this code does not
540 initially work for you. It may help to enable device hotplugging
541 support. As of this writing the exact hardware interface is
542 strongly in flux, so no good recommendation can be made.
546 depends on 8xx || 8260
550 bool "PC PS/2 style Keyboard"
551 depends on 4xx || CPM2
554 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
555 default y if PPC_PREP
558 bool "Distribute interrupts on all CPUs by default"
559 depends on SMP && !MV64360
561 This option gives the kernel permission to distribute IRQs across
562 multiple CPUs. Saying N here will route all IRQs to the first
563 CPU. Generally saying Y is safe, although some problems have been
564 reported with SMP Power Macintoshes with this option enabled.
566 source "arch/powerpc/platforms/pseries/Kconfig"
571 default y if SMP && PPC_PSERIES
573 config ARCH_SELECT_MEMORY_MODEL
577 config ARCH_FLATMEM_ENABLE
579 depends on PPC64 && !NUMA
581 config ARCH_SPARSEMEM_ENABLE
584 config ARCH_SPARSEMEM_DEFAULT
586 depends on SMP && PPC_PSERIES
590 config HAVE_ARCH_EARLY_PFN_TO_NID
592 depends on NEED_MULTIPLE_NODES
594 config ARCH_MEMORY_PROBE
596 depends on MEMORY_HOTPLUG
602 This option changes the kernel logical page size to 64k. On machines
603 without processor support for 64k pages, the kernel will simulate
604 them by loading each individual 4k page on demand transparently,
605 while on hardware with such support, it will be used to map
606 normal application pages.
609 bool "SMT (Hyperthreading) scheduler support"
610 depends on PPC64 && SMP
613 SMT scheduler support improves the CPU scheduler's decision making
614 when dealing with POWER5 cpus at a cost of slightly increased
615 overhead in some places. If unsure say N here.
617 config PROC_DEVICETREE
618 bool "Support for device tree in /proc"
621 This option adds a device-tree directory under /proc which contains
622 an image of the device tree that the kernel copies from Open
623 Firmware or other boot firmware. If unsure, say Y here.
625 source "arch/powerpc/platforms/prep/Kconfig"
628 bool "Default bootloader kernel arguments"
629 depends on !PPC_ISERIES
632 string "Initial kernel command string"
633 depends on CMDLINE_BOOL
634 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
636 On some platforms, there is currently no way for the boot loader to
637 pass arguments to the kernel. For these platforms, you can supply
638 some command-line options at build time by entering them here. In
639 most cases you will need to specify the root device here.
642 source kernel/power/Kconfig
646 bool "Enable seccomp to safely compute untrusted bytecode"
650 This kernel feature is useful for number crunching applications
651 that may need to compute untrusted bytecode during their
652 execution. By using pipes or other transports made available to
653 the process as file descriptors supporting the read/write
654 syscalls, it's possible to isolate those applications in
655 their own address space using seccomp. Once seccomp is
656 enabled via /proc/<pid>/seccomp, it cannot be disabled
657 and the task is only allowed to execute a few safe syscalls
658 defined by each seccomp mode.
660 If unsure, say Y. Only embedded should say N here.
671 bool "Support for ISA-bus hardware"
672 depends on PPC_PREP || PPC_CHRP
675 Find out whether you have ISA slots on your motherboard. ISA is the
676 name of a bus system, i.e. the way the CPU talks to the other stuff
677 inside your box. If you have an Apple machine, say N here; if you
678 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
679 you have an embedded board, consult your board documentation.
681 config GENERIC_ISA_DMA
683 depends on PPC64 || POWER4 || 6xx && !CPM2
691 config PPC_INDIRECT_PCI
694 default y if 40x || 44x || 85xx || 83xx
703 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
708 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
709 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
710 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
711 default PCI_QSPAN if !4xx && !CPM2 && 8xx
713 Find out whether your system includes a PCI bus. PCI is the name of
714 a bus system, i.e. the way the CPU talks to the other stuff inside
715 your box. If you say Y here, the kernel will include drivers and
716 infrastructure code to support PCI bus devices.
723 bool " Supprt for 2nd PCI host controller"
724 depends on PCI && MPC834x
725 default y if MPC834x_SYS
729 depends on !4xx && !CPM2 && 8xx
732 Say Y here if you have a system based on a Motorola 8xx-series
733 embedded processor with a QSPAN PCI interface, otherwise say N.
737 depends on PCI && 8260
738 select PPC_INDIRECT_PCI
742 bool " Enable workaround for MPC826x erratum PCI 9"
743 depends on PCI_8260 && !ADS8272
747 prompt " IDMA channel for PCI 9 workaround"
750 config 8260_PCI9_IDMA1
753 config 8260_PCI9_IDMA2
756 config 8260_PCI9_IDMA3
759 config 8260_PCI9_IDMA4
764 source "drivers/pci/Kconfig"
766 source "drivers/pcmcia/Kconfig"
768 source "drivers/pci/hotplug/Kconfig"
772 menu "Advanced setup"
775 config ADVANCED_OPTIONS
776 bool "Prompt for advanced kernel configuration options"
778 This option will enable prompting for a variety of advanced kernel
779 configuration options. These options can cause the kernel to not
780 work if they are set incorrectly, but can be used to optimize certain
781 aspects of kernel memory management.
783 Unless you know what you are doing, say N here.
785 comment "Default settings for advanced configuration options are used"
786 depends on !ADVANCED_OPTIONS
788 config HIGHMEM_START_BOOL
789 bool "Set high memory pool address"
790 depends on ADVANCED_OPTIONS && HIGHMEM
792 This option allows you to set the base address of the kernel virtual
793 area used to map high memory pages. This can be useful in
794 optimizing the layout of kernel virtual memory.
796 Say N here unless you know what you are doing.
799 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
802 config LOWMEM_SIZE_BOOL
803 bool "Set maximum low memory"
804 depends on ADVANCED_OPTIONS
806 This option allows you to set the maximum amount of memory which
807 will be used as "low memory", that is, memory which the kernel can
808 access directly, without having to set up a kernel virtual mapping.
809 This can be useful in optimizing the layout of kernel virtual
812 Say N here unless you know what you are doing.
815 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
818 config KERNEL_START_BOOL
819 bool "Set custom kernel base address"
820 depends on ADVANCED_OPTIONS
822 This option allows you to set the kernel virtual address at which
823 the kernel will map low memory (the kernel image will be linked at
824 this address). This can be useful in optimizing the virtual memory
825 layout of the system.
827 Say N here unless you know what you are doing.
830 hex "Virtual address of kernel base" if KERNEL_START_BOOL
833 config TASK_SIZE_BOOL
834 bool "Set custom user task size"
835 depends on ADVANCED_OPTIONS
837 This option allows you to set the amount of virtual address space
838 allocated to user tasks. This can be useful in optimizing the
839 virtual memory layout of the system.
841 Say N here unless you know what you are doing.
844 hex "Size of user task space" if TASK_SIZE_BOOL
847 config CONSISTENT_START_BOOL
848 bool "Set custom consistent memory pool address"
849 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
851 This option allows you to set the base virtual address
852 of the the consistent memory pool. This pool of virtual
853 memory is used to make consistent memory allocations.
855 config CONSISTENT_START
856 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
857 default "0xff100000" if NOT_COHERENT_CACHE
859 config CONSISTENT_SIZE_BOOL
860 bool "Set custom consistent memory pool size"
861 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
863 This option allows you to set the size of the the
864 consistent memory pool. This pool of virtual memory
865 is used to make consistent memory allocations.
867 config CONSISTENT_SIZE
868 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
869 default "0x00200000" if NOT_COHERENT_CACHE
871 config BOOT_LOAD_BOOL
872 bool "Set the boot link/load address"
873 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
875 This option allows you to set the initial load address of the zImage
876 or zImage.initrd file. This can be useful if you are on a board
877 which has a small amount of memory.
879 Say N here unless you know what you are doing.
882 hex "Link/load address for booting" if BOOT_LOAD_BOOL
883 default "0x00400000" if 40x || 8xx || 8260
884 default "0x01000000" if 44x
888 bool "Pinned Kernel TLBs (860 ONLY)"
889 depends on ADVANCED_OPTIONS && 8xx
895 default "0xc000000000000000"
900 source "drivers/Kconfig"
904 # XXX source "arch/ppc/8xx_io/Kconfig"
906 # XXX source "arch/ppc/8260_io/Kconfig"
908 source "arch/powerpc/platforms/iseries/Kconfig"
912 menu "Instrumentation Support"
913 depends on EXPERIMENTAL
915 source "arch/powerpc/oprofile/Kconfig"
918 bool "Kprobes (EXPERIMENTAL)"
921 Kprobes allows you to trap at almost any kernel address and
922 execute a callback function. register_kprobe() establishes
923 a probepoint and specifies the callback. Kprobes is useful
924 for kernel debugging, non-intrusive instrumentation and testing.
925 If in doubt, say "N".
928 source "arch/powerpc/Kconfig.debug"
930 source "security/Kconfig"
934 depends on COMPAT && KEYS
937 source "crypto/Kconfig"