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
14 config PPC_PM_NEEDS_RTC_LIB
34 config GENERIC_HARDIRQS
42 config RWSEM_GENERIC_SPINLOCK
45 config RWSEM_XCHGADD_ALGORITHM
49 config ARCH_HAS_ILOG2_U32
53 config ARCH_HAS_ILOG2_U64
57 config GENERIC_HWEIGHT
61 config GENERIC_CALIBRATE_DELAY
65 config GENERIC_FIND_NEXT_BIT
83 depends on COMPAT && SYSVIPC
86 # All PPC32s use generic nvram driver through ppc_md
91 config SCHED_NO_NO_OMIT_FRAME_POINTER
95 config ARCH_MAY_HAVE_PC_FDC
97 default !PPC_PSERIES || PCI
102 config PPC_UDBG_16550
106 config GENERIC_TBSYNC
108 default y if PPC32 && SMP
120 config DEFAULT_UIMAGE
123 Used to allow a board to specify it wants a uImage built by default
126 menu "Processor support"
128 prompt "Processor Type"
133 bool "52xx/6xx/7xx/74xx"
137 There are four families of PowerPC chips supported. The more common
138 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
139 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
140 embedded versions (403 and 405) and the high end 64 bit Power
141 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
143 This option is the catch-all for 6xx types, including some of the
144 embedded versions. Unless there is see an option for the specific
145 chip family you are using, you want this option.
147 You do not want this if you are building a kernel for a 64 bit
148 IBM RS/6000 or an Apple G5, choose 6xx.
150 If unsure, select this option
152 Note that the kernel runs in 32-bit mode even on 64-bit chips.
155 bool "Freescale 82xx"
160 bool "Freescale 83xx"
167 bool "Freescale 85xx"
173 bool "Freescale 86xx"
180 The Freescale E600 SoCs have 74xx cores.
189 select PPC_DCR_NATIVE
193 select PPC_DCR_NATIVE
197 bool "Freescale e200"
202 bool "Optimize for POWER4"
206 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
207 The resulting binary will not work on POWER3 or RS64 processors
208 when compiled with binutils 2.15 or later.
213 default y if !POWER4_ONLY
222 # this is temp to handle compat with arch=ppc
226 # this is temp to handle compat with arch=ppc
230 # this is temp to handle compat with arch=ppc
241 config PPC_DCR_NATIVE
251 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
254 config PPC_OF_PLATFORM_PCI
256 depends on PPC64 # not supported on 32 bits yet
261 depends on E200 || E500
266 depends on E200 || E500
271 depends on 44x || E500
273 default y if E500 && PHYS_64BIT
276 bool 'Large physical address support' if E500
277 depends on 44x || E500
278 select RESOURCES_64BIT
281 This option enables kernel support for larger than 32-bit physical
282 addresses. This features is not be available on all e500 cores.
284 If in doubt, say N here.
287 bool "AltiVec Support"
288 depends on CLASSIC32 || POWER4
290 This option enables kernel support for the Altivec extensions to the
291 PowerPC processor. The kernel currently supports saving and restoring
292 altivec registers, and turning on the 'altivec enable' bit so user
293 processes can execute altivec instructions.
295 This option is only usefully if you have a processor that supports
296 altivec (G4, otherwise known as 74xx series), but does not have
297 any affect on a non-altivec cpu (it does, however add code to the
300 If in doubt, say Y here.
304 depends on E200 || E500
307 This option enables kernel support for the Signal Processing
308 Extensions (SPE) to the PowerPC processor. The kernel currently
309 supports saving and restoring SPE registers, and turning on the
310 'spe enable' bit so user processes can execute SPE instructions.
312 This option is only useful if you have a processor that supports
313 SPE (e500, otherwise known as 85xx series), but does not have any
314 effect on a non-spe cpu (it does, however add code to the kernel).
316 If in doubt, say Y here.
320 depends on 6xx || POWER3 || POWER4 || PPC64
323 config PPC_STD_MMU_32
325 depends on PPC_STD_MMU && PPC32
327 config VIRT_CPU_ACCOUNTING
328 bool "Deterministic task and CPU time accounting"
332 Select this option to enable more accurate task and CPU time
333 accounting. This is done by reading a CPU counter on each
334 kernel entry and exit and on transitions within the kernel
335 between system, softirq and hardirq state, so there is a
336 small performance impact. This also enables accounting of
337 stolen time on logically-partitioned systems running on
338 IBM POWER5-based machines.
340 If in doubt, say Y here.
343 depends on PPC_STD_MMU
344 bool "Symmetric multi-processing support"
346 This enables support for systems with more than one CPU. If you have
347 a system with only one CPU, say N. If you have a system with more
348 than one CPU, say Y. Note that the kernel does not currently
349 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
350 since they have inadequate hardware support for multiprocessor
353 If you say N here, the kernel will run on single and multiprocessor
354 machines, but will use only one CPU of a multiprocessor machine. If
355 you say Y here, the kernel will run on single-processor machines.
356 On a single-processor machine, the kernel will run faster if you say
359 If you don't know what to do here, say N.
362 int "Maximum number of CPUs (2-128)"
365 default "32" if PPC64
368 config NOT_COHERENT_CACHE
370 depends on 4xx || 8xx || E200
374 source "init/Kconfig"
376 source "arch/powerpc/platforms/Kconfig"
378 source arch/powerpc/platforms/embedded6xx/Kconfig
379 source arch/powerpc/platforms/4xx/Kconfig
381 menu "Kernel options"
384 bool "High memory support"
387 source kernel/Kconfig.hz
388 source kernel/Kconfig.preempt
389 source "fs/Kconfig.binfmt"
391 # We optimistically allocate largepages from the VM, so make the limit
392 # large enough (16MB). This badly named config option is actually
394 config FORCE_MAX_ZONEORDER
397 default "9" if PPC_64K_PAGES
400 config MATH_EMULATION
401 bool "Math emulation"
402 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
404 Some PowerPC chips designed for embedded applications do not have
405 a floating-point unit and therefore do not implement the
406 floating-point instructions in the PowerPC instruction set. If you
407 say Y here, the kernel will include code to emulate a floating-point
408 unit, which will allow programs that use floating-point
412 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
413 depends on EXPERIMENTAL && PPC64
416 Cause IO segments sent to a device for DMA to be merged virtually
417 by the IOMMU when they happen to have been allocated contiguously.
418 This doesn't add pressure to the IOMMU allocator. However, some
419 drivers don't support getting large merged segments coming back
420 from *_map_sg(). Say Y if you know the drivers you are using are
421 properly handling this case.
424 bool "Support for enabling/disabling CPUs"
425 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
427 Say Y here to be able to disable and re-enable individual
428 CPUs at runtime on SMP machines.
430 Say N if you are unsure.
432 config ARCH_ENABLE_MEMORY_HOTPLUG
436 bool "kexec system call (EXPERIMENTAL)"
437 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
439 kexec is a system call that implements the ability to shutdown your
440 current kernel, and to start another kernel. It is like a reboot
441 but it is independent of the system firmware. And like a reboot
442 you can start any kernel with it, not just Linux.
444 The name comes from the similarity to the exec system call.
446 It is an ongoing process to be certain the hardware in a machine
447 is properly shutdown, so do not be surprised if this code does not
448 initially work for you. It may help to enable device hotplugging
449 support. As of this writing the exact hardware interface is
450 strongly in flux, so no good recommendation can be made.
453 bool "Build a kdump crash kernel (EXPERIMENTAL)"
454 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
456 Build a kernel suitable for use as a kdump capture kernel.
457 The kernel will be linked at a different address than normal, and
458 so can only be used for Kdump.
460 Don't change this unless you know what you are doing.
464 depends on 8xx || 8260
468 bool "PC PS/2 style Keyboard"
469 depends on 4xx || CPM2
472 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
473 default y if PPC_PREP
476 bool "Distribute interrupts on all CPUs by default"
477 depends on SMP && !MV64360
479 This option gives the kernel permission to distribute IRQs across
480 multiple CPUs. Saying N here will route all IRQs to the first
481 CPU. Generally saying Y is safe, although some problems have been
482 reported with SMP Power Macintoshes with this option enabled.
488 default y if SMP && PPC_PSERIES
493 depends on NEED_MULTIPLE_NODES
495 config ARCH_SELECT_MEMORY_MODEL
499 config ARCH_FLATMEM_ENABLE
501 depends on (PPC64 && !NUMA) || PPC32
503 config ARCH_SPARSEMEM_ENABLE
507 config ARCH_SPARSEMEM_DEFAULT
509 depends on (SMP && PPC_PSERIES) || PPC_PS3
511 config ARCH_POPULATES_NODE_MAP
516 config ARCH_MEMORY_PROBE
518 depends on MEMORY_HOTPLUG
520 # Some NUMA nodes have memory ranges that span
521 # other nodes. Even though a pfn is valid and
522 # between a node's start and end pfns, it may not
523 # reside on that node. See memmap_init_zone()
525 config NODES_SPAN_OTHER_NODES
527 depends on NEED_MULTIPLE_NODES
533 This option changes the kernel logical page size to 64k. On machines
534 without processor support for 64k pages, the kernel will simulate
535 them by loading each individual 4k page on demand transparently,
536 while on hardware with such support, it will be used to map
537 normal application pages.
540 bool "SMT (Hyperthreading) scheduler support"
541 depends on PPC64 && SMP
543 SMT scheduler support improves the CPU scheduler's decision making
544 when dealing with POWER5 cpus at a cost of slightly increased
545 overhead in some places. If unsure say N here.
547 config PROC_DEVICETREE
548 bool "Support for device tree in /proc"
551 This option adds a device-tree directory under /proc which contains
552 an image of the device tree that the kernel copies from Open
553 Firmware or other boot firmware. If unsure, say Y here.
556 bool "Default bootloader kernel arguments"
559 string "Initial kernel command string"
560 depends on CMDLINE_BOOL
561 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
563 On some platforms, there is currently no way for the boot loader to
564 pass arguments to the kernel. For these platforms, you can supply
565 some command-line options at build time by entering them here. In
566 most cases you will need to specify the root device here.
569 source kernel/power/Kconfig
573 bool "Enable seccomp to safely compute untrusted bytecode"
577 This kernel feature is useful for number crunching applications
578 that may need to compute untrusted bytecode during their
579 execution. By using pipes or other transports made available to
580 the process as file descriptors supporting the read/write
581 syscalls, it's possible to isolate those applications in
582 their own address space using seccomp. Once seccomp is
583 enabled via /proc/<pid>/seccomp, it cannot be disabled
584 and the task is only allowed to execute a few safe syscalls
585 defined by each seccomp mode.
587 If unsure, say Y. Only embedded should say N here.
598 bool "Support for ISA-bus hardware"
599 depends on PPC_PREP || PPC_CHRP
602 Find out whether you have ISA slots on your motherboard. ISA is the
603 name of a bus system, i.e. the way the CPU talks to the other stuff
604 inside your box. If you have an Apple machine, say N here; if you
605 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
606 you have an embedded board, consult your board documentation.
612 config GENERIC_ISA_DMA
614 depends on PPC64 || POWER4 || 6xx && !CPM2
629 config PPC_INDIRECT_PCI
632 default y if 40x || 44x
635 config PPC_INDIRECT_PCI_BE
637 depends PPC_INDIRECT_PCI
653 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
658 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
659 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
660 || MPC7448HPC2 || PPC_PS3
661 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
662 && !PPC_85xx && !PPC_86xx
663 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
664 default PCI_QSPAN if !4xx && !CPM2 && 8xx
666 Find out whether your system includes a PCI bus. PCI is the name of
667 a bus system, i.e. the way the CPU talks to the other stuff inside
668 your box. If you say Y here, the kernel will include drivers and
669 infrastructure code to support PCI bus devices.
677 depends on !4xx && !CPM2 && 8xx
680 Say Y here if you have a system based on a Motorola 8xx-series
681 embedded processor with a QSPAN PCI interface, otherwise say N.
685 depends on PCI && 8260
686 select PPC_INDIRECT_PCI
690 bool "Enable workaround for MPC826x erratum PCI 9"
691 depends on PCI_8260 && !ADS8272
695 prompt "IDMA channel for PCI 9 workaround"
698 config 8260_PCI9_IDMA1
701 config 8260_PCI9_IDMA2
704 config 8260_PCI9_IDMA3
707 config 8260_PCI9_IDMA4
712 source "drivers/pci/pcie/Kconfig"
714 source "drivers/pci/Kconfig"
716 source "drivers/pcmcia/Kconfig"
718 source "drivers/pci/hotplug/Kconfig"
722 menu "Advanced setup"
725 config ADVANCED_OPTIONS
726 bool "Prompt for advanced kernel configuration options"
728 This option will enable prompting for a variety of advanced kernel
729 configuration options. These options can cause the kernel to not
730 work if they are set incorrectly, but can be used to optimize certain
731 aspects of kernel memory management.
733 Unless you know what you are doing, say N here.
735 comment "Default settings for advanced configuration options are used"
736 depends on !ADVANCED_OPTIONS
738 config HIGHMEM_START_BOOL
739 bool "Set high memory pool address"
740 depends on ADVANCED_OPTIONS && HIGHMEM
742 This option allows you to set the base address of the kernel virtual
743 area used to map high memory pages. This can be useful in
744 optimizing the layout of kernel virtual memory.
746 Say N here unless you know what you are doing.
749 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
752 config LOWMEM_SIZE_BOOL
753 bool "Set maximum low memory"
754 depends on ADVANCED_OPTIONS
756 This option allows you to set the maximum amount of memory which
757 will be used as "low memory", that is, memory which the kernel can
758 access directly, without having to set up a kernel virtual mapping.
759 This can be useful in optimizing the layout of kernel virtual
762 Say N here unless you know what you are doing.
765 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
768 config KERNEL_START_BOOL
769 bool "Set custom kernel base address"
770 depends on ADVANCED_OPTIONS
772 This option allows you to set the kernel virtual address at which
773 the kernel will map low memory (the kernel image will be linked at
774 this address). This can be useful in optimizing the virtual memory
775 layout of the system.
777 Say N here unless you know what you are doing.
780 hex "Virtual address of kernel base" if KERNEL_START_BOOL
783 config TASK_SIZE_BOOL
784 bool "Set custom user task size"
785 depends on ADVANCED_OPTIONS
787 This option allows you to set the amount of virtual address space
788 allocated to user tasks. This can be useful in optimizing the
789 virtual memory layout of the system.
791 Say N here unless you know what you are doing.
794 hex "Size of user task space" if TASK_SIZE_BOOL
797 config CONSISTENT_START_BOOL
798 bool "Set custom consistent memory pool address"
799 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
801 This option allows you to set the base virtual address
802 of the consistent memory pool. This pool of virtual
803 memory is used to make consistent memory allocations.
805 config CONSISTENT_START
806 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
807 default "0xff100000" if NOT_COHERENT_CACHE
809 config CONSISTENT_SIZE_BOOL
810 bool "Set custom consistent memory pool size"
811 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
813 This option allows you to set the size of the
814 consistent memory pool. This pool of virtual memory
815 is used to make consistent memory allocations.
817 config CONSISTENT_SIZE
818 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
819 default "0x00200000" if NOT_COHERENT_CACHE
821 config BOOT_LOAD_BOOL
822 bool "Set the boot link/load address"
823 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
825 This option allows you to set the initial load address of the zImage
826 or zImage.initrd file. This can be useful if you are on a board
827 which has a small amount of memory.
829 Say N here unless you know what you are doing.
832 hex "Link/load address for booting" if BOOT_LOAD_BOOL
833 default "0x00400000" if 40x || 8xx || 8260
834 default "0x01000000" if 44x
838 bool "Pinned Kernel TLBs (860 ONLY)"
839 depends on ADVANCED_OPTIONS && 8xx
845 default "0xc000000000000000"
850 source "drivers/Kconfig"
854 # XXX source "arch/ppc/8xx_io/Kconfig"
856 # XXX source "arch/ppc/8260_io/Kconfig"
858 source "arch/powerpc/sysdev/qe_lib/Kconfig"
863 menu "Instrumentation Support"
864 depends on EXPERIMENTAL
866 source "arch/powerpc/oprofile/Kconfig"
869 bool "Kprobes (EXPERIMENTAL)"
870 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
872 Kprobes allows you to trap at almost any kernel address and
873 execute a callback function. register_kprobe() establishes
874 a probepoint and specifies the callback. Kprobes is useful
875 for kernel debugging, non-intrusive instrumentation and testing.
876 If in doubt, say "N".
879 source "arch/powerpc/Kconfig.debug"
881 source "security/Kconfig"
885 depends on COMPAT && KEYS
888 source "crypto/Kconfig"