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/85xx/Kconfig
382 menu "Kernel options"
385 bool "High memory support"
388 source kernel/Kconfig.hz
389 source kernel/Kconfig.preempt
390 source "fs/Kconfig.binfmt"
392 # We optimistically allocate largepages from the VM, so make the limit
393 # large enough (16MB). This badly named config option is actually
395 config FORCE_MAX_ZONEORDER
398 default "9" if PPC_64K_PAGES
401 config MATH_EMULATION
402 bool "Math emulation"
403 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
405 Some PowerPC chips designed for embedded applications do not have
406 a floating-point unit and therefore do not implement the
407 floating-point instructions in the PowerPC instruction set. If you
408 say Y here, the kernel will include code to emulate a floating-point
409 unit, which will allow programs that use floating-point
413 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
414 depends on EXPERIMENTAL && PPC64
417 Cause IO segments sent to a device for DMA to be merged virtually
418 by the IOMMU when they happen to have been allocated contiguously.
419 This doesn't add pressure to the IOMMU allocator. However, some
420 drivers don't support getting large merged segments coming back
421 from *_map_sg(). Say Y if you know the drivers you are using are
422 properly handling this case.
425 bool "Support for enabling/disabling CPUs"
426 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
428 Say Y here to be able to disable and re-enable individual
429 CPUs at runtime on SMP machines.
431 Say N if you are unsure.
433 config ARCH_ENABLE_MEMORY_HOTPLUG
437 bool "kexec system call (EXPERIMENTAL)"
438 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
440 kexec is a system call that implements the ability to shutdown your
441 current kernel, and to start another kernel. It is like a reboot
442 but it is independent of the system firmware. And like a reboot
443 you can start any kernel with it, not just Linux.
445 The name comes from the similarity to the exec system call.
447 It is an ongoing process to be certain the hardware in a machine
448 is properly shutdown, so do not be surprised if this code does not
449 initially work for you. It may help to enable device hotplugging
450 support. As of this writing the exact hardware interface is
451 strongly in flux, so no good recommendation can be made.
454 bool "Build a kdump crash kernel (EXPERIMENTAL)"
455 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
457 Build a kernel suitable for use as a kdump capture kernel.
458 The kernel will be linked at a different address than normal, and
459 so can only be used for Kdump.
461 Don't change this unless you know what you are doing.
465 depends on 8xx || 8260
469 bool "PC PS/2 style Keyboard"
470 depends on 4xx || CPM2
473 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
474 default y if PPC_PREP
477 bool "Distribute interrupts on all CPUs by default"
478 depends on SMP && !MV64360
480 This option gives the kernel permission to distribute IRQs across
481 multiple CPUs. Saying N here will route all IRQs to the first
482 CPU. Generally saying Y is safe, although some problems have been
483 reported with SMP Power Macintoshes with this option enabled.
489 default y if SMP && PPC_PSERIES
494 depends on NEED_MULTIPLE_NODES
496 config ARCH_SELECT_MEMORY_MODEL
500 config ARCH_FLATMEM_ENABLE
502 depends on (PPC64 && !NUMA) || PPC32
504 config ARCH_SPARSEMEM_ENABLE
508 config ARCH_SPARSEMEM_DEFAULT
510 depends on (SMP && PPC_PSERIES) || PPC_PS3
512 config ARCH_POPULATES_NODE_MAP
517 config ARCH_MEMORY_PROBE
519 depends on MEMORY_HOTPLUG
521 # Some NUMA nodes have memory ranges that span
522 # other nodes. Even though a pfn is valid and
523 # between a node's start and end pfns, it may not
524 # reside on that node. See memmap_init_zone()
526 config NODES_SPAN_OTHER_NODES
528 depends on NEED_MULTIPLE_NODES
534 This option changes the kernel logical page size to 64k. On machines
535 without processor support for 64k pages, the kernel will simulate
536 them by loading each individual 4k page on demand transparently,
537 while on hardware with such support, it will be used to map
538 normal application pages.
541 bool "SMT (Hyperthreading) scheduler support"
542 depends on PPC64 && SMP
544 SMT scheduler support improves the CPU scheduler's decision making
545 when dealing with POWER5 cpus at a cost of slightly increased
546 overhead in some places. If unsure say N here.
548 config PROC_DEVICETREE
549 bool "Support for device tree in /proc"
552 This option adds a device-tree directory under /proc which contains
553 an image of the device tree that the kernel copies from Open
554 Firmware or other boot firmware. If unsure, say Y here.
557 bool "Default bootloader kernel arguments"
560 string "Initial kernel command string"
561 depends on CMDLINE_BOOL
562 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
564 On some platforms, there is currently no way for the boot loader to
565 pass arguments to the kernel. For these platforms, you can supply
566 some command-line options at build time by entering them here. In
567 most cases you will need to specify the root device here.
570 source kernel/power/Kconfig
574 bool "Enable seccomp to safely compute untrusted bytecode"
578 This kernel feature is useful for number crunching applications
579 that may need to compute untrusted bytecode during their
580 execution. By using pipes or other transports made available to
581 the process as file descriptors supporting the read/write
582 syscalls, it's possible to isolate those applications in
583 their own address space using seccomp. Once seccomp is
584 enabled via /proc/<pid>/seccomp, it cannot be disabled
585 and the task is only allowed to execute a few safe syscalls
586 defined by each seccomp mode.
588 If unsure, say Y. Only embedded should say N here.
599 bool "Support for ISA-bus hardware"
600 depends on PPC_PREP || PPC_CHRP
603 Find out whether you have ISA slots on your motherboard. ISA is the
604 name of a bus system, i.e. the way the CPU talks to the other stuff
605 inside your box. If you have an Apple machine, say N here; if you
606 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
607 you have an embedded board, consult your board documentation.
613 config GENERIC_ISA_DMA
615 depends on PPC64 || POWER4 || 6xx && !CPM2
630 config PPC_INDIRECT_PCI
633 default y if 40x || 44x
636 config PPC_INDIRECT_PCI_BE
638 depends PPC_INDIRECT_PCI
654 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
659 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
660 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
661 || MPC7448HPC2 || PPC_PS3
662 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
663 && !PPC_85xx && !PPC_86xx
664 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
665 default PCI_QSPAN if !4xx && !CPM2 && 8xx
667 Find out whether your system includes a PCI bus. PCI is the name of
668 a bus system, i.e. the way the CPU talks to the other stuff inside
669 your box. If you say Y here, the kernel will include drivers and
670 infrastructure code to support PCI bus devices.
678 depends on !4xx && !CPM2 && 8xx
681 Say Y here if you have a system based on a Motorola 8xx-series
682 embedded processor with a QSPAN PCI interface, otherwise say N.
686 depends on PCI && 8260
687 select PPC_INDIRECT_PCI
691 bool "Enable workaround for MPC826x erratum PCI 9"
692 depends on PCI_8260 && !ADS8272
696 prompt "IDMA channel for PCI 9 workaround"
699 config 8260_PCI9_IDMA1
702 config 8260_PCI9_IDMA2
705 config 8260_PCI9_IDMA3
708 config 8260_PCI9_IDMA4
713 source "drivers/pci/pcie/Kconfig"
715 source "drivers/pci/Kconfig"
717 source "drivers/pcmcia/Kconfig"
719 source "drivers/pci/hotplug/Kconfig"
723 menu "Advanced setup"
726 config ADVANCED_OPTIONS
727 bool "Prompt for advanced kernel configuration options"
729 This option will enable prompting for a variety of advanced kernel
730 configuration options. These options can cause the kernel to not
731 work if they are set incorrectly, but can be used to optimize certain
732 aspects of kernel memory management.
734 Unless you know what you are doing, say N here.
736 comment "Default settings for advanced configuration options are used"
737 depends on !ADVANCED_OPTIONS
739 config HIGHMEM_START_BOOL
740 bool "Set high memory pool address"
741 depends on ADVANCED_OPTIONS && HIGHMEM
743 This option allows you to set the base address of the kernel virtual
744 area used to map high memory pages. This can be useful in
745 optimizing the layout of kernel virtual memory.
747 Say N here unless you know what you are doing.
750 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
753 config LOWMEM_SIZE_BOOL
754 bool "Set maximum low memory"
755 depends on ADVANCED_OPTIONS
757 This option allows you to set the maximum amount of memory which
758 will be used as "low memory", that is, memory which the kernel can
759 access directly, without having to set up a kernel virtual mapping.
760 This can be useful in optimizing the layout of kernel virtual
763 Say N here unless you know what you are doing.
766 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
769 config KERNEL_START_BOOL
770 bool "Set custom kernel base address"
771 depends on ADVANCED_OPTIONS
773 This option allows you to set the kernel virtual address at which
774 the kernel will map low memory (the kernel image will be linked at
775 this address). This can be useful in optimizing the virtual memory
776 layout of the system.
778 Say N here unless you know what you are doing.
781 hex "Virtual address of kernel base" if KERNEL_START_BOOL
784 config TASK_SIZE_BOOL
785 bool "Set custom user task size"
786 depends on ADVANCED_OPTIONS
788 This option allows you to set the amount of virtual address space
789 allocated to user tasks. This can be useful in optimizing the
790 virtual memory layout of the system.
792 Say N here unless you know what you are doing.
795 hex "Size of user task space" if TASK_SIZE_BOOL
798 config CONSISTENT_START_BOOL
799 bool "Set custom consistent memory pool address"
800 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
802 This option allows you to set the base virtual address
803 of the consistent memory pool. This pool of virtual
804 memory is used to make consistent memory allocations.
806 config CONSISTENT_START
807 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
808 default "0xff100000" if NOT_COHERENT_CACHE
810 config CONSISTENT_SIZE_BOOL
811 bool "Set custom consistent memory pool size"
812 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
814 This option allows you to set the size of the
815 consistent memory pool. This pool of virtual memory
816 is used to make consistent memory allocations.
818 config CONSISTENT_SIZE
819 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
820 default "0x00200000" if NOT_COHERENT_CACHE
822 config BOOT_LOAD_BOOL
823 bool "Set the boot link/load address"
824 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
826 This option allows you to set the initial load address of the zImage
827 or zImage.initrd file. This can be useful if you are on a board
828 which has a small amount of memory.
830 Say N here unless you know what you are doing.
833 hex "Link/load address for booting" if BOOT_LOAD_BOOL
834 default "0x00400000" if 40x || 8xx || 8260
835 default "0x01000000" if 44x
839 bool "Pinned Kernel TLBs (860 ONLY)"
840 depends on ADVANCED_OPTIONS && 8xx
846 default "0xc000000000000000"
851 source "drivers/Kconfig"
855 # XXX source "arch/ppc/8xx_io/Kconfig"
857 # XXX source "arch/ppc/8260_io/Kconfig"
859 source "arch/powerpc/sysdev/qe_lib/Kconfig"
864 menu "Instrumentation Support"
865 depends on EXPERIMENTAL
867 source "arch/powerpc/oprofile/Kconfig"
870 bool "Kprobes (EXPERIMENTAL)"
871 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
873 Kprobes allows you to trap at almost any kernel address and
874 execute a callback function. register_kprobe() establishes
875 a probepoint and specifies the callback. Kprobes is useful
876 for kernel debugging, non-intrusive instrumentation and testing.
877 If in doubt, say "N".
880 source "arch/powerpc/Kconfig.debug"
882 source "security/Kconfig"
886 depends on COMPAT && KEYS
889 source "crypto/Kconfig"