1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
5 mainmenu "Linux/PowerPC Kernel Configuration"
7 source "arch/powerpc/platforms/Kconfig.cputype"
29 config GENERIC_CMOS_UPDATE
35 config GENERIC_TIME_VSYSCALL
38 config GENERIC_CLOCKEVENTS
41 config GENERIC_HARDIRQS
45 config ARCH_SETS_UP_PER_CPU_AREA
52 config RWSEM_GENERIC_SPINLOCK
55 config RWSEM_XCHGADD_ALGORITHM
59 config GENERIC_LOCKBREAK
62 depends on SMP && PREEMPT
64 config ARCH_HAS_ILOG2_U32
68 config ARCH_HAS_ILOG2_U64
72 config GENERIC_HWEIGHT
76 config GENERIC_CALIBRATE_DELAY
80 config GENERIC_FIND_NEXT_BIT
84 config ARCH_NO_VIRT_TO_BUS
101 depends on COMPAT && SYSVIPC
104 # All PPC32s use generic nvram driver through ppc_md
109 config SCHED_NO_NO_OMIT_FRAME_POINTER
113 config ARCH_MAY_HAVE_PC_FDC
115 default !PPC_PSERIES || PCI
123 config PPC_UDBG_16550
127 config GENERIC_TBSYNC
129 default y if PPC32 && SMP
141 config SYS_SUPPORTS_APM_EMULATION
142 default y if PMAC_APM_EMU
145 config DEFAULT_UIMAGE
148 Used to allow a board to specify it wants a uImage built by default
153 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
156 config PPC_DCR_NATIVE
166 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
169 config PPC_OF_PLATFORM_PCI
171 depends on PPC64 # not supported on 32 bits yet
174 source "init/Kconfig"
176 source "arch/powerpc/platforms/Kconfig"
178 menu "Kernel options"
181 bool "High memory support"
184 source kernel/time/Kconfig
185 source kernel/Kconfig.hz
186 source kernel/Kconfig.preempt
187 source "fs/Kconfig.binfmt"
189 # We optimistically allocate largepages from the VM, so make the limit
190 # large enough (16MB). This badly named config option is actually
192 config FORCE_MAX_ZONEORDER
195 default "9" if PPC_64K_PAGES
198 config HUGETLB_PAGE_SIZE_VARIABLE
200 depends on HUGETLB_PAGE
203 config MATH_EMULATION
204 bool "Math emulation"
205 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
207 Some PowerPC chips designed for embedded applications do not have
208 a floating-point unit and therefore do not implement the
209 floating-point instructions in the PowerPC instruction set. If you
210 say Y here, the kernel will include code to emulate a floating-point
211 unit, which will allow programs that use floating-point
214 config 8XX_MINIMAL_FPEMU
215 bool "Minimal math emulation for 8xx"
216 depends on 8xx && !MATH_EMULATION
218 Older arch/ppc kernels still emulated a few floating point
219 instructions such as load and store, even when full math
220 emulation is disabled. Say "Y" here if you want to preserve
223 It is recommended that you build a soft-float userspace instead.
226 bool "Enable IOMMU virtual merging"
230 Cause IO segments sent to a device for DMA to be merged virtually
231 by the IOMMU when they happen to have been allocated contiguously.
232 This doesn't add pressure to the IOMMU allocator. However, some
233 drivers don't support getting large merged segments coming back
236 Most drivers don't have this problem; it is safe to say Y here.
239 bool "Support for enabling/disabling CPUs"
240 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
242 Say Y here to be able to disable and re-enable individual
243 CPUs at runtime on SMP machines.
245 Say N if you are unsure.
247 config ARCH_ENABLE_MEMORY_HOTPLUG
251 bool "kexec system call (EXPERIMENTAL)"
252 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
254 kexec is a system call that implements the ability to shutdown your
255 current kernel, and to start another kernel. It is like a reboot
256 but it is independent of the system firmware. And like a reboot
257 you can start any kernel with it, not just Linux.
259 The name comes from the similarity to the exec system call.
261 It is an ongoing process to be certain the hardware in a machine
262 is properly shutdown, so do not be surprised if this code does not
263 initially work for you. It may help to enable device hotplugging
264 support. As of this writing the exact hardware interface is
265 strongly in flux, so no good recommendation can be made.
268 bool "Build a kdump crash kernel (EXPERIMENTAL)"
269 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
271 Build a kernel suitable for use as a kdump capture kernel.
272 The kernel will be linked at a different address than normal, and
273 so can only be used for Kdump.
275 Don't change this unless you know what you are doing.
278 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
279 default y if PPC_PREP
282 bool "Distribute interrupts on all CPUs by default"
283 depends on SMP && !MV64360
285 This option gives the kernel permission to distribute IRQs across
286 multiple CPUs. Saying N here will route all IRQs to the first
287 CPU. Generally saying Y is safe, although some problems have been
288 reported with SMP Power Macintoshes with this option enabled.
293 default y if SMP && PPC_PSERIES
298 depends on NEED_MULTIPLE_NODES
300 config ARCH_SELECT_MEMORY_MODEL
304 config ARCH_FLATMEM_ENABLE
306 depends on (PPC64 && !NUMA) || PPC32
308 config ARCH_SPARSEMEM_ENABLE
311 select SPARSEMEM_VMEMMAP_ENABLE
313 config ARCH_SPARSEMEM_DEFAULT
315 depends on (SMP && PPC_PSERIES) || PPC_PS3
317 config ARCH_POPULATES_NODE_MAP
322 config ARCH_MEMORY_PROBE
324 depends on MEMORY_HOTPLUG
326 # Some NUMA nodes have memory ranges that span
327 # other nodes. Even though a pfn is valid and
328 # between a node's start and end pfns, it may not
329 # reside on that node. See memmap_init_zone()
331 config NODES_SPAN_OTHER_NODES
333 depends on NEED_MULTIPLE_NODES
335 config PPC_HAS_HASH_64K
343 select PPC_HAS_HASH_64K
345 This option changes the kernel logical page size to 64k. On machines
346 without processor support for 64k pages, the kernel will simulate
347 them by loading each individual 4k page on demand transparently,
348 while on hardware with such support, it will be used to map
349 normal application pages.
352 bool "SMT (Hyperthreading) scheduler support"
353 depends on PPC64 && SMP
355 SMT scheduler support improves the CPU scheduler's decision making
356 when dealing with POWER5 cpus at a cost of slightly increased
357 overhead in some places. If unsure say N here.
359 config PROC_DEVICETREE
360 bool "Support for device tree in /proc"
363 This option adds a device-tree directory under /proc which contains
364 an image of the device tree that the kernel copies from Open
365 Firmware or other boot firmware. If unsure, say Y here.
368 bool "Default bootloader kernel arguments"
371 string "Initial kernel command string"
372 depends on CMDLINE_BOOL
373 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
375 On some platforms, there is currently no way for the boot loader to
376 pass arguments to the kernel. For these platforms, you can supply
377 some command-line options at build time by entering them here. In
378 most cases you will need to specify the root device here.
381 source kernel/power/Kconfig
385 bool "Enable seccomp to safely compute untrusted bytecode"
389 This kernel feature is useful for number crunching applications
390 that may need to compute untrusted bytecode during their
391 execution. By using pipes or other transports made available to
392 the process as file descriptors supporting the read/write
393 syscalls, it's possible to isolate those applications in
394 their own address space using seccomp. Once seccomp is
395 enabled via /proc/<pid>/seccomp, it cannot be disabled
396 and the task is only allowed to execute a few safe syscalls
397 defined by each seccomp mode.
399 If unsure, say Y. Only embedded should say N here.
401 config WANT_DEVICE_TREE
406 string "Static device tree source file"
407 depends on WANT_DEVICE_TREE
409 This specifies the device tree source (.dts) file to be
410 compiled and included when building the bootwrapper. If a
411 relative filename is given, then it will be relative to
412 arch/powerpc/boot/dts. If you are not using the bootwrapper,
413 or do not need to build a dts into the bootwrapper, this
416 For example, this is required when building a cuImage target
417 for an older U-Boot, which cannot pass a device tree itself.
418 Such a kernel will not work with a newer U-Boot that tries to
419 pass a device tree (unless you tell it not to). If your U-Boot
420 does not mention a device tree in "help bootm", then use the
421 cuImage target and specify a device tree here. Otherwise, use
422 the uImage target and leave this field blank.
433 bool "Support for ISA-bus hardware"
434 depends on PPC_PREP || PPC_CHRP
437 Find out whether you have ISA slots on your motherboard. ISA is the
438 name of a bus system, i.e. the way the CPU talks to the other stuff
439 inside your box. If you have an Apple machine, say N here; if you
440 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
441 you have an embedded board, consult your board documentation.
447 config GENERIC_ISA_DMA
449 depends on PPC64 || POWER4 || 6xx && !CPM2
452 config PPC_INDIRECT_PCI
455 default y if 40x || 44x
469 select PPC_INDIRECT_PCI
471 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
476 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
477 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
479 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
480 && !PPC_85xx && !PPC_86xx
481 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
482 default PCI_QSPAN if !4xx && !CPM2 && 8xx
483 select ARCH_SUPPORTS_MSI
485 Find out whether your system includes a PCI bus. PCI is the name of
486 a bus system, i.e. the way the CPU talks to the other stuff inside
487 your box. If you say Y here, the kernel will include drivers and
488 infrastructure code to support PCI bus devices.
498 depends on !4xx && !CPM2 && 8xx
501 Say Y here if you have a system based on a Motorola 8xx-series
502 embedded processor with a QSPAN PCI interface, otherwise say N.
506 depends on PCI && 8260
507 select PPC_INDIRECT_PCI
511 bool "Enable workaround for MPC826x erratum PCI 9"
512 depends on PCI_8260 && !8272
516 prompt "IDMA channel for PCI 9 workaround"
519 config 8260_PCI9_IDMA1
522 config 8260_PCI9_IDMA2
525 config 8260_PCI9_IDMA3
528 config 8260_PCI9_IDMA4
533 source "drivers/pci/pcie/Kconfig"
535 source "drivers/pci/Kconfig"
537 source "drivers/pcmcia/Kconfig"
539 source "drivers/pci/hotplug/Kconfig"
543 menu "Advanced setup"
546 config ADVANCED_OPTIONS
547 bool "Prompt for advanced kernel configuration options"
549 This option will enable prompting for a variety of advanced kernel
550 configuration options. These options can cause the kernel to not
551 work if they are set incorrectly, but can be used to optimize certain
552 aspects of kernel memory management.
554 Unless you know what you are doing, say N here.
556 comment "Default settings for advanced configuration options are used"
557 depends on !ADVANCED_OPTIONS
559 config HIGHMEM_START_BOOL
560 bool "Set high memory pool address"
561 depends on ADVANCED_OPTIONS && HIGHMEM
563 This option allows you to set the base address of the kernel virtual
564 area used to map high memory pages. This can be useful in
565 optimizing the layout of kernel virtual memory.
567 Say N here unless you know what you are doing.
570 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
573 config LOWMEM_SIZE_BOOL
574 bool "Set maximum low memory"
575 depends on ADVANCED_OPTIONS
577 This option allows you to set the maximum amount of memory which
578 will be used as "low memory", that is, memory which the kernel can
579 access directly, without having to set up a kernel virtual mapping.
580 This can be useful in optimizing the layout of kernel virtual
583 Say N here unless you know what you are doing.
586 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
589 config KERNEL_START_BOOL
590 bool "Set custom kernel base address"
591 depends on ADVANCED_OPTIONS
593 This option allows you to set the kernel virtual address at which
594 the kernel will map low memory (the kernel image will be linked at
595 this address). This can be useful in optimizing the virtual memory
596 layout of the system.
598 Say N here unless you know what you are doing.
601 hex "Virtual address of kernel base" if KERNEL_START_BOOL
604 config TASK_SIZE_BOOL
605 bool "Set custom user task size"
606 depends on ADVANCED_OPTIONS
608 This option allows you to set the amount of virtual address space
609 allocated to user tasks. This can be useful in optimizing the
610 virtual memory layout of the system.
612 Say N here unless you know what you are doing.
615 hex "Size of user task space" if TASK_SIZE_BOOL
616 default "0x80000000" if PPC_PREP || PPC_8xx
619 config CONSISTENT_START_BOOL
620 bool "Set custom consistent memory pool address"
621 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
623 This option allows you to set the base virtual address
624 of the consistent memory pool. This pool of virtual
625 memory is used to make consistent memory allocations.
627 config CONSISTENT_START
628 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
629 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
630 default "0xff100000" if NOT_COHERENT_CACHE
632 config CONSISTENT_SIZE_BOOL
633 bool "Set custom consistent memory pool size"
634 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
636 This option allows you to set the size of the
637 consistent memory pool. This pool of virtual memory
638 is used to make consistent memory allocations.
640 config CONSISTENT_SIZE
641 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
642 default "0x00200000" if NOT_COHERENT_CACHE
644 config BOOT_LOAD_BOOL
645 bool "Set the boot link/load address"
646 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
648 This option allows you to set the initial load address of the zImage
649 or zImage.initrd file. This can be useful if you are on a board
650 which has a small amount of memory.
652 Say N here unless you know what you are doing.
655 hex "Link/load address for booting" if BOOT_LOAD_BOOL
656 default "0x00400000" if 40x || 8xx || 8260
657 default "0x01000000" if 44x
661 bool "Pinned Kernel TLBs (860 ONLY)"
662 depends on ADVANCED_OPTIONS && 8xx
668 default "0xc000000000000000"
673 source "drivers/Kconfig"
677 # XXX source "arch/ppc/8xx_io/Kconfig"
679 # XXX source "arch/ppc/8260_io/Kconfig"
681 source "arch/powerpc/sysdev/qe_lib/Kconfig"
685 source "kernel/Kconfig.instrumentation"
687 source "arch/powerpc/Kconfig.debug"
689 source "security/Kconfig"
693 depends on COMPAT && KEYS
696 source "crypto/Kconfig"