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 (2-128)"
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"
264 depends on PPC32 && BROKEN
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 && BROKEN
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
388 depends on PPC_PSERIES
389 bool "Support for GX bus based adapters"
392 Bus device driver for GX bus based adapters.
398 config GENERIC_TBSYNC
400 default y if CONFIG_PPC32 && CONFIG_SMP
403 source "drivers/cpufreq/Kconfig"
406 bool "Support for Apple PowerBooks"
407 depends on CPU_FREQ && ADB_PMU && PPC32
408 select CPU_FREQ_TABLE
410 This adds support for frequency switching on Apple PowerBooks,
411 this currently includes some models of iBook & Titanium
414 config CPU_FREQ_PMAC64
415 bool "Support for some Apple G5s"
416 depends on CPU_FREQ && PMAC_SMU && PPC64
417 select CPU_FREQ_TABLE
419 This adds support for frequency switching on Apple iMac G5,
420 and some of the more recent desktop G5 machines as well.
422 config PPC601_SYNC_FIX
423 bool "Workarounds for PPC601 bugs"
424 depends on 6xx && (PPC_PREP || PPC_PMAC)
426 Some versions of the PPC601 (the first PowerPC chip) have bugs which
427 mean that extra synchronization instructions are required near
428 certain instructions, typically those that make major changes to the
429 CPU state. These extra instructions reduce performance slightly.
430 If you say N here, these extra instructions will not be included,
431 resulting in a kernel which will run faster but may not run at all
432 on some systems with the PPC601 chip.
434 If in doubt, say Y here.
437 bool "Thermal Management Support"
440 G3 and G4 processors have an on-chip temperature sensor called the
441 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
442 temperature within 2-4 degrees Celsius. This option shows the current
443 on-die temperature in /proc/cpuinfo if the cpu supports it.
445 Unfortunately, on some chip revisions, this sensor is very inaccurate
446 and in some cases, does not work at all, so don't assume the cpu
447 temp is actually what /proc/cpuinfo says it is.
450 bool "Interrupt driven TAU driver (DANGEROUS)"
453 The TAU supports an interrupt driven mode which causes an interrupt
454 whenever the temperature goes out of range. This is the fastest way
455 to get notified the temp has exceeded a range. With this option off,
456 a timer is used to re-check the temperature periodically.
458 However, on some cpus it appears that the TAU interrupt hardware
459 is buggy and can cause a situation which would lead unexplained hard
462 Unless you are extending the TAU driver, or enjoy kernel/hardware
463 debugging, leave this option off.
466 bool "Average high and low temp"
469 The TAU hardware can compare the temperature to an upper and lower
470 bound. The default behavior is to show both the upper and lower
471 bound in /proc/cpuinfo. If the range is large, the temperature is
472 either changing a lot, or the TAU hardware is broken (likely on some
473 G4's). If the range is small (around 4 degrees), the temperature is
474 relatively stable. If you say Y here, a single temperature value,
475 halfway between the upper and lower bounds, will be reported in
478 If in doubt, say N here.
481 source arch/powerpc/platforms/embedded6xx/Kconfig
482 source arch/powerpc/platforms/4xx/Kconfig
483 source arch/powerpc/platforms/85xx/Kconfig
484 source arch/powerpc/platforms/8xx/Kconfig
485 source arch/powerpc/platforms/cell/Kconfig
487 menu "Kernel options"
490 bool "High memory support"
493 source kernel/Kconfig.hz
494 source kernel/Kconfig.preempt
495 source "fs/Kconfig.binfmt"
497 # We optimistically allocate largepages from the VM, so make the limit
498 # large enough (16MB). This badly named config option is actually
500 config FORCE_MAX_ZONEORDER
503 default "9" if PPC_64K_PAGES
506 config MATH_EMULATION
507 bool "Math emulation"
508 depends on 4xx || 8xx || E200 || E500
510 Some PowerPC chips designed for embedded applications do not have
511 a floating-point unit and therefore do not implement the
512 floating-point instructions in the PowerPC instruction set. If you
513 say Y here, the kernel will include code to emulate a floating-point
514 unit, which will allow programs that use floating-point
518 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
519 depends on EXPERIMENTAL && PPC64
522 Cause IO segments sent to a device for DMA to be merged virtually
523 by the IOMMU when they happen to have been allocated contiguously.
524 This doesn't add pressure to the IOMMU allocator. However, some
525 drivers don't support getting large merged segments coming back
526 from *_map_sg(). Say Y if you know the drivers you are using are
527 properly handling this case.
530 bool "Support for enabling/disabling CPUs"
531 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
533 Say Y here to be able to disable and re-enable individual
534 CPUs at runtime on SMP machines.
536 Say N if you are unsure.
539 bool "kexec system call (EXPERIMENTAL)"
540 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
542 kexec is a system call that implements the ability to shutdown your
543 current kernel, and to start another kernel. It is like a reboot
544 but it is indepedent of the system firmware. And like a reboot
545 you can start any kernel with it, not just Linux.
547 The name comes from the similiarity to the exec system call.
549 It is an ongoing process to be certain the hardware in a machine
550 is properly shutdown, so do not be surprised if this code does not
551 initially work for you. It may help to enable device hotplugging
552 support. As of this writing the exact hardware interface is
553 strongly in flux, so no good recommendation can be made.
557 depends on 8xx || 8260
561 bool "PC PS/2 style Keyboard"
562 depends on 4xx || CPM2
565 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
566 default y if PPC_PREP
569 bool "Distribute interrupts on all CPUs by default"
570 depends on SMP && !MV64360
572 This option gives the kernel permission to distribute IRQs across
573 multiple CPUs. Saying N here will route all IRQs to the first
574 CPU. Generally saying Y is safe, although some problems have been
575 reported with SMP Power Macintoshes with this option enabled.
577 source "arch/powerpc/platforms/pseries/Kconfig"
582 default y if SMP && PPC_PSERIES
584 config ARCH_SELECT_MEMORY_MODEL
588 config ARCH_FLATMEM_ENABLE
590 depends on PPC64 && !NUMA
592 config ARCH_SPARSEMEM_ENABLE
595 config ARCH_SPARSEMEM_DEFAULT
597 depends on SMP && PPC_PSERIES
601 config HAVE_ARCH_EARLY_PFN_TO_NID
603 depends on NEED_MULTIPLE_NODES
605 config ARCH_MEMORY_PROBE
607 depends on MEMORY_HOTPLUG
613 This option changes the kernel logical page size to 64k. On machines
614 without processor support for 64k pages, the kernel will simulate
615 them by loading each individual 4k page on demand transparently,
616 while on hardware with such support, it will be used to map
617 normal application pages.
620 bool "SMT (Hyperthreading) scheduler support"
621 depends on PPC64 && SMP
624 SMT scheduler support improves the CPU scheduler's decision making
625 when dealing with POWER5 cpus at a cost of slightly increased
626 overhead in some places. If unsure say N here.
628 config PROC_DEVICETREE
629 bool "Support for device tree in /proc"
632 This option adds a device-tree directory under /proc which contains
633 an image of the device tree that the kernel copies from Open
634 Firmware or other boot firmware. If unsure, say Y here.
636 source "arch/powerpc/platforms/prep/Kconfig"
639 bool "Default bootloader kernel arguments"
640 depends on !PPC_ISERIES
643 string "Initial kernel command string"
644 depends on CMDLINE_BOOL
645 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
647 On some platforms, there is currently no way for the boot loader to
648 pass arguments to the kernel. For these platforms, you can supply
649 some command-line options at build time by entering them here. In
650 most cases you will need to specify the root device here.
653 source kernel/power/Kconfig
657 bool "Enable seccomp to safely compute untrusted bytecode"
661 This kernel feature is useful for number crunching applications
662 that may need to compute untrusted bytecode during their
663 execution. By using pipes or other transports made available to
664 the process as file descriptors supporting the read/write
665 syscalls, it's possible to isolate those applications in
666 their own address space using seccomp. Once seccomp is
667 enabled via /proc/<pid>/seccomp, it cannot be disabled
668 and the task is only allowed to execute a few safe syscalls
669 defined by each seccomp mode.
671 If unsure, say Y. Only embedded should say N here.
682 bool "Support for ISA-bus hardware"
683 depends on PPC_PREP || PPC_CHRP
686 Find out whether you have ISA slots on your motherboard. ISA is the
687 name of a bus system, i.e. the way the CPU talks to the other stuff
688 inside your box. If you have an Apple machine, say N here; if you
689 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
690 you have an embedded board, consult your board documentation.
692 config GENERIC_ISA_DMA
694 depends on PPC64 || POWER4 || 6xx && !CPM2
702 config PPC_INDIRECT_PCI
705 default y if 40x || 44x || 85xx || 83xx
714 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
719 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
720 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
721 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
722 default PCI_QSPAN if !4xx && !CPM2 && 8xx
724 Find out whether your system includes a PCI bus. PCI is the name of
725 a bus system, i.e. the way the CPU talks to the other stuff inside
726 your box. If you say Y here, the kernel will include drivers and
727 infrastructure code to support PCI bus devices.
734 bool " Supprt for 2nd PCI host controller"
735 depends on PCI && MPC834x
736 default y if MPC834x_SYS
740 depends on !4xx && !CPM2 && 8xx
743 Say Y here if you have a system based on a Motorola 8xx-series
744 embedded processor with a QSPAN PCI interface, otherwise say N.
748 depends on PCI && 8260
749 select PPC_INDIRECT_PCI
753 bool " Enable workaround for MPC826x erratum PCI 9"
754 depends on PCI_8260 && !ADS8272
758 prompt " IDMA channel for PCI 9 workaround"
761 config 8260_PCI9_IDMA1
764 config 8260_PCI9_IDMA2
767 config 8260_PCI9_IDMA3
770 config 8260_PCI9_IDMA4
775 source "drivers/pci/Kconfig"
777 source "drivers/pcmcia/Kconfig"
779 source "drivers/pci/hotplug/Kconfig"
783 menu "Advanced setup"
786 config ADVANCED_OPTIONS
787 bool "Prompt for advanced kernel configuration options"
789 This option will enable prompting for a variety of advanced kernel
790 configuration options. These options can cause the kernel to not
791 work if they are set incorrectly, but can be used to optimize certain
792 aspects of kernel memory management.
794 Unless you know what you are doing, say N here.
796 comment "Default settings for advanced configuration options are used"
797 depends on !ADVANCED_OPTIONS
799 config HIGHMEM_START_BOOL
800 bool "Set high memory pool address"
801 depends on ADVANCED_OPTIONS && HIGHMEM
803 This option allows you to set the base address of the kernel virtual
804 area used to map high memory pages. This can be useful in
805 optimizing the layout of kernel virtual memory.
807 Say N here unless you know what you are doing.
810 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
813 config LOWMEM_SIZE_BOOL
814 bool "Set maximum low memory"
815 depends on ADVANCED_OPTIONS
817 This option allows you to set the maximum amount of memory which
818 will be used as "low memory", that is, memory which the kernel can
819 access directly, without having to set up a kernel virtual mapping.
820 This can be useful in optimizing the layout of kernel virtual
823 Say N here unless you know what you are doing.
826 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
829 config KERNEL_START_BOOL
830 bool "Set custom kernel base address"
831 depends on ADVANCED_OPTIONS
833 This option allows you to set the kernel virtual address at which
834 the kernel will map low memory (the kernel image will be linked at
835 this address). This can be useful in optimizing the virtual memory
836 layout of the system.
838 Say N here unless you know what you are doing.
841 hex "Virtual address of kernel base" if KERNEL_START_BOOL
844 config TASK_SIZE_BOOL
845 bool "Set custom user task size"
846 depends on ADVANCED_OPTIONS
848 This option allows you to set the amount of virtual address space
849 allocated to user tasks. This can be useful in optimizing the
850 virtual memory layout of the system.
852 Say N here unless you know what you are doing.
855 hex "Size of user task space" if TASK_SIZE_BOOL
858 config CONSISTENT_START_BOOL
859 bool "Set custom consistent memory pool address"
860 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
862 This option allows you to set the base virtual address
863 of the the consistent memory pool. This pool of virtual
864 memory is used to make consistent memory allocations.
866 config CONSISTENT_START
867 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
868 default "0xff100000" if NOT_COHERENT_CACHE
870 config CONSISTENT_SIZE_BOOL
871 bool "Set custom consistent memory pool size"
872 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
874 This option allows you to set the size of the the
875 consistent memory pool. This pool of virtual memory
876 is used to make consistent memory allocations.
878 config CONSISTENT_SIZE
879 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
880 default "0x00200000" if NOT_COHERENT_CACHE
882 config BOOT_LOAD_BOOL
883 bool "Set the boot link/load address"
884 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
886 This option allows you to set the initial load address of the zImage
887 or zImage.initrd file. This can be useful if you are on a board
888 which has a small amount of memory.
890 Say N here unless you know what you are doing.
893 hex "Link/load address for booting" if BOOT_LOAD_BOOL
894 default "0x00400000" if 40x || 8xx || 8260
895 default "0x01000000" if 44x
899 bool "Pinned Kernel TLBs (860 ONLY)"
900 depends on ADVANCED_OPTIONS && 8xx
906 default "0xc000000000000000"
911 source "drivers/Kconfig"
915 # XXX source "arch/ppc/8xx_io/Kconfig"
917 # XXX source "arch/ppc/8260_io/Kconfig"
919 source "arch/powerpc/platforms/iseries/Kconfig"
923 menu "Instrumentation Support"
924 depends on EXPERIMENTAL
926 source "arch/powerpc/oprofile/Kconfig"
929 bool "Kprobes (EXPERIMENTAL)"
932 Kprobes allows you to trap at almost any kernel address and
933 execute a callback function. register_kprobe() establishes
934 a probepoint and specifies the callback. Kprobes is useful
935 for kernel debugging, non-intrusive instrumentation and testing.
936 If in doubt, say "N".
939 source "arch/powerpc/Kconfig.debug"
941 source "security/Kconfig"
945 depends on COMPAT && KEYS
948 source "crypto/Kconfig"