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
380 source arch/powerpc/platforms/82xx/Kconfig
381 source arch/powerpc/platforms/83xx/Kconfig
382 source arch/powerpc/platforms/85xx/Kconfig
383 source arch/powerpc/platforms/8xx/Kconfig
385 menu "Kernel options"
388 bool "High memory support"
391 source kernel/Kconfig.hz
392 source kernel/Kconfig.preempt
393 source "fs/Kconfig.binfmt"
395 # We optimistically allocate largepages from the VM, so make the limit
396 # large enough (16MB). This badly named config option is actually
398 config FORCE_MAX_ZONEORDER
401 default "9" if PPC_64K_PAGES
404 config MATH_EMULATION
405 bool "Math emulation"
406 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
408 Some PowerPC chips designed for embedded applications do not have
409 a floating-point unit and therefore do not implement the
410 floating-point instructions in the PowerPC instruction set. If you
411 say Y here, the kernel will include code to emulate a floating-point
412 unit, which will allow programs that use floating-point
416 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
417 depends on EXPERIMENTAL && PPC64
420 Cause IO segments sent to a device for DMA to be merged virtually
421 by the IOMMU when they happen to have been allocated contiguously.
422 This doesn't add pressure to the IOMMU allocator. However, some
423 drivers don't support getting large merged segments coming back
424 from *_map_sg(). Say Y if you know the drivers you are using are
425 properly handling this case.
428 bool "Support for enabling/disabling CPUs"
429 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
431 Say Y here to be able to disable and re-enable individual
432 CPUs at runtime on SMP machines.
434 Say N if you are unsure.
436 config ARCH_ENABLE_MEMORY_HOTPLUG
440 bool "kexec system call (EXPERIMENTAL)"
441 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
443 kexec is a system call that implements the ability to shutdown your
444 current kernel, and to start another kernel. It is like a reboot
445 but it is independent of the system firmware. And like a reboot
446 you can start any kernel with it, not just Linux.
448 The name comes from the similarity to the exec system call.
450 It is an ongoing process to be certain the hardware in a machine
451 is properly shutdown, so do not be surprised if this code does not
452 initially work for you. It may help to enable device hotplugging
453 support. As of this writing the exact hardware interface is
454 strongly in flux, so no good recommendation can be made.
457 bool "Build a kdump crash kernel (EXPERIMENTAL)"
458 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
460 Build a kernel suitable for use as a kdump capture kernel.
461 The kernel will be linked at a different address than normal, and
462 so can only be used for Kdump.
464 Don't change this unless you know what you are doing.
468 depends on 8xx || 8260
472 bool "PC PS/2 style Keyboard"
473 depends on 4xx || CPM2
476 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
477 default y if PPC_PREP
480 bool "Distribute interrupts on all CPUs by default"
481 depends on SMP && !MV64360
483 This option gives the kernel permission to distribute IRQs across
484 multiple CPUs. Saying N here will route all IRQs to the first
485 CPU. Generally saying Y is safe, although some problems have been
486 reported with SMP Power Macintoshes with this option enabled.
492 default y if SMP && PPC_PSERIES
497 depends on NEED_MULTIPLE_NODES
499 config ARCH_SELECT_MEMORY_MODEL
503 config ARCH_FLATMEM_ENABLE
505 depends on (PPC64 && !NUMA) || PPC32
507 config ARCH_SPARSEMEM_ENABLE
511 config ARCH_SPARSEMEM_DEFAULT
513 depends on (SMP && PPC_PSERIES) || PPC_PS3
515 config ARCH_POPULATES_NODE_MAP
520 config ARCH_MEMORY_PROBE
522 depends on MEMORY_HOTPLUG
524 # Some NUMA nodes have memory ranges that span
525 # other nodes. Even though a pfn is valid and
526 # between a node's start and end pfns, it may not
527 # reside on that node. See memmap_init_zone()
529 config NODES_SPAN_OTHER_NODES
531 depends on NEED_MULTIPLE_NODES
537 This option changes the kernel logical page size to 64k. On machines
538 without processor support for 64k pages, the kernel will simulate
539 them by loading each individual 4k page on demand transparently,
540 while on hardware with such support, it will be used to map
541 normal application pages.
544 bool "SMT (Hyperthreading) scheduler support"
545 depends on PPC64 && SMP
547 SMT scheduler support improves the CPU scheduler's decision making
548 when dealing with POWER5 cpus at a cost of slightly increased
549 overhead in some places. If unsure say N here.
551 config PROC_DEVICETREE
552 bool "Support for device tree in /proc"
555 This option adds a device-tree directory under /proc which contains
556 an image of the device tree that the kernel copies from Open
557 Firmware or other boot firmware. If unsure, say Y here.
560 bool "Default bootloader kernel arguments"
563 string "Initial kernel command string"
564 depends on CMDLINE_BOOL
565 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
567 On some platforms, there is currently no way for the boot loader to
568 pass arguments to the kernel. For these platforms, you can supply
569 some command-line options at build time by entering them here. In
570 most cases you will need to specify the root device here.
573 source kernel/power/Kconfig
577 bool "Enable seccomp to safely compute untrusted bytecode"
581 This kernel feature is useful for number crunching applications
582 that may need to compute untrusted bytecode during their
583 execution. By using pipes or other transports made available to
584 the process as file descriptors supporting the read/write
585 syscalls, it's possible to isolate those applications in
586 their own address space using seccomp. Once seccomp is
587 enabled via /proc/<pid>/seccomp, it cannot be disabled
588 and the task is only allowed to execute a few safe syscalls
589 defined by each seccomp mode.
591 If unsure, say Y. Only embedded should say N here.
602 bool "Support for ISA-bus hardware"
603 depends on PPC_PREP || PPC_CHRP
606 Find out whether you have ISA slots on your motherboard. ISA is the
607 name of a bus system, i.e. the way the CPU talks to the other stuff
608 inside your box. If you have an Apple machine, say N here; if you
609 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
610 you have an embedded board, consult your board documentation.
616 config GENERIC_ISA_DMA
618 depends on PPC64 || POWER4 || 6xx && !CPM2
633 config PPC_INDIRECT_PCI
636 default y if 40x || 44x
639 config PPC_INDIRECT_PCI_BE
641 depends PPC_INDIRECT_PCI
657 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
662 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
663 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
664 || MPC7448HPC2 || PPC_PS3
665 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
666 && !PPC_85xx && !PPC_86xx
667 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
668 default PCI_QSPAN if !4xx && !CPM2 && 8xx
670 Find out whether your system includes a PCI bus. PCI is the name of
671 a bus system, i.e. the way the CPU talks to the other stuff inside
672 your box. If you say Y here, the kernel will include drivers and
673 infrastructure code to support PCI bus devices.
681 depends on !4xx && !CPM2 && 8xx
684 Say Y here if you have a system based on a Motorola 8xx-series
685 embedded processor with a QSPAN PCI interface, otherwise say N.
689 depends on PCI && 8260
690 select PPC_INDIRECT_PCI
694 bool "Enable workaround for MPC826x erratum PCI 9"
695 depends on PCI_8260 && !ADS8272
699 prompt "IDMA channel for PCI 9 workaround"
702 config 8260_PCI9_IDMA1
705 config 8260_PCI9_IDMA2
708 config 8260_PCI9_IDMA3
711 config 8260_PCI9_IDMA4
716 source "drivers/pci/pcie/Kconfig"
718 source "drivers/pci/Kconfig"
720 source "drivers/pcmcia/Kconfig"
722 source "drivers/pci/hotplug/Kconfig"
726 menu "Advanced setup"
729 config ADVANCED_OPTIONS
730 bool "Prompt for advanced kernel configuration options"
732 This option will enable prompting for a variety of advanced kernel
733 configuration options. These options can cause the kernel to not
734 work if they are set incorrectly, but can be used to optimize certain
735 aspects of kernel memory management.
737 Unless you know what you are doing, say N here.
739 comment "Default settings for advanced configuration options are used"
740 depends on !ADVANCED_OPTIONS
742 config HIGHMEM_START_BOOL
743 bool "Set high memory pool address"
744 depends on ADVANCED_OPTIONS && HIGHMEM
746 This option allows you to set the base address of the kernel virtual
747 area used to map high memory pages. This can be useful in
748 optimizing the layout of kernel virtual memory.
750 Say N here unless you know what you are doing.
753 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
756 config LOWMEM_SIZE_BOOL
757 bool "Set maximum low memory"
758 depends on ADVANCED_OPTIONS
760 This option allows you to set the maximum amount of memory which
761 will be used as "low memory", that is, memory which the kernel can
762 access directly, without having to set up a kernel virtual mapping.
763 This can be useful in optimizing the layout of kernel virtual
766 Say N here unless you know what you are doing.
769 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
772 config KERNEL_START_BOOL
773 bool "Set custom kernel base address"
774 depends on ADVANCED_OPTIONS
776 This option allows you to set the kernel virtual address at which
777 the kernel will map low memory (the kernel image will be linked at
778 this address). This can be useful in optimizing the virtual memory
779 layout of the system.
781 Say N here unless you know what you are doing.
784 hex "Virtual address of kernel base" if KERNEL_START_BOOL
787 config TASK_SIZE_BOOL
788 bool "Set custom user task size"
789 depends on ADVANCED_OPTIONS
791 This option allows you to set the amount of virtual address space
792 allocated to user tasks. This can be useful in optimizing the
793 virtual memory layout of the system.
795 Say N here unless you know what you are doing.
798 hex "Size of user task space" if TASK_SIZE_BOOL
801 config CONSISTENT_START_BOOL
802 bool "Set custom consistent memory pool address"
803 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
805 This option allows you to set the base virtual address
806 of the consistent memory pool. This pool of virtual
807 memory is used to make consistent memory allocations.
809 config CONSISTENT_START
810 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
811 default "0xff100000" if NOT_COHERENT_CACHE
813 config CONSISTENT_SIZE_BOOL
814 bool "Set custom consistent memory pool size"
815 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
817 This option allows you to set the size of the
818 consistent memory pool. This pool of virtual memory
819 is used to make consistent memory allocations.
821 config CONSISTENT_SIZE
822 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
823 default "0x00200000" if NOT_COHERENT_CACHE
825 config BOOT_LOAD_BOOL
826 bool "Set the boot link/load address"
827 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
829 This option allows you to set the initial load address of the zImage
830 or zImage.initrd file. This can be useful if you are on a board
831 which has a small amount of memory.
833 Say N here unless you know what you are doing.
836 hex "Link/load address for booting" if BOOT_LOAD_BOOL
837 default "0x00400000" if 40x || 8xx || 8260
838 default "0x01000000" if 44x
842 bool "Pinned Kernel TLBs (860 ONLY)"
843 depends on ADVANCED_OPTIONS && 8xx
849 default "0xc000000000000000"
854 source "drivers/Kconfig"
858 # XXX source "arch/ppc/8xx_io/Kconfig"
860 # XXX source "arch/ppc/8260_io/Kconfig"
862 source "arch/powerpc/sysdev/qe_lib/Kconfig"
867 menu "Instrumentation Support"
868 depends on EXPERIMENTAL
870 source "arch/powerpc/oprofile/Kconfig"
873 bool "Kprobes (EXPERIMENTAL)"
874 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
876 Kprobes allows you to trap at almost any kernel address and
877 execute a callback function. register_kprobe() establishes
878 a probepoint and specifies the callback. Kprobes is useful
879 for kernel debugging, non-intrusive instrumentation and testing.
880 If in doubt, say "N".
883 source "arch/powerpc/Kconfig.debug"
885 source "security/Kconfig"
889 depends on COMPAT && KEYS
892 source "crypto/Kconfig"