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"
24 config GENERIC_HARDIRQS
32 config RWSEM_GENERIC_SPINLOCK
35 config RWSEM_XCHGADD_ALGORITHM
39 config ARCH_HAS_ILOG2_U32
43 config ARCH_HAS_ILOG2_U64
47 config GENERIC_HWEIGHT
51 config GENERIC_CALIBRATE_DELAY
55 config GENERIC_FIND_NEXT_BIT
59 config ARCH_NO_VIRT_TO_BUS
76 depends on COMPAT && SYSVIPC
79 # All PPC32s use generic nvram driver through ppc_md
84 config SCHED_NO_NO_OMIT_FRAME_POINTER
88 config ARCH_MAY_HAVE_PC_FDC
90 default !PPC_PSERIES || PCI
102 config GENERIC_TBSYNC
104 default y if PPC32 && SMP
116 config SYS_SUPPORTS_APM_EMULATION
117 default y if PMAC_APM_EMU
120 config DEFAULT_UIMAGE
123 Used to allow a board to specify it wants a uImage built by default
128 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
131 config PPC_DCR_NATIVE
141 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
144 config PPC_OF_PLATFORM_PCI
146 depends on PPC64 # not supported on 32 bits yet
149 source "init/Kconfig"
151 source "arch/powerpc/platforms/Kconfig"
153 menu "Kernel options"
156 bool "High memory support"
159 source kernel/Kconfig.hz
160 source kernel/Kconfig.preempt
161 source "fs/Kconfig.binfmt"
163 # We optimistically allocate largepages from the VM, so make the limit
164 # large enough (16MB). This badly named config option is actually
166 config FORCE_MAX_ZONEORDER
169 default "9" if PPC_64K_PAGES
172 config MATH_EMULATION
173 bool "Math emulation"
174 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
176 Some PowerPC chips designed for embedded applications do not have
177 a floating-point unit and therefore do not implement the
178 floating-point instructions in the PowerPC instruction set. If you
179 say Y here, the kernel will include code to emulate a floating-point
180 unit, which will allow programs that use floating-point
184 bool "Enable IOMMU virtual merging"
188 Cause IO segments sent to a device for DMA to be merged virtually
189 by the IOMMU when they happen to have been allocated contiguously.
190 This doesn't add pressure to the IOMMU allocator. However, some
191 drivers don't support getting large merged segments coming back
194 Most drivers don't have this problem; it is safe to say Y here.
197 bool "Support for enabling/disabling CPUs"
198 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
200 Say Y here to be able to disable and re-enable individual
201 CPUs at runtime on SMP machines.
203 Say N if you are unsure.
205 config ARCH_ENABLE_MEMORY_HOTPLUG
209 bool "kexec system call (EXPERIMENTAL)"
210 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
212 kexec is a system call that implements the ability to shutdown your
213 current kernel, and to start another kernel. It is like a reboot
214 but it is independent of the system firmware. And like a reboot
215 you can start any kernel with it, not just Linux.
217 The name comes from the similarity to the exec system call.
219 It is an ongoing process to be certain the hardware in a machine
220 is properly shutdown, so do not be surprised if this code does not
221 initially work for you. It may help to enable device hotplugging
222 support. As of this writing the exact hardware interface is
223 strongly in flux, so no good recommendation can be made.
226 bool "Build a kdump crash kernel (EXPERIMENTAL)"
227 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
229 Build a kernel suitable for use as a kdump capture kernel.
230 The kernel will be linked at a different address than normal, and
231 so can only be used for Kdump.
233 Don't change this unless you know what you are doing.
236 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
237 default y if PPC_PREP
240 bool "Distribute interrupts on all CPUs by default"
241 depends on SMP && !MV64360
243 This option gives the kernel permission to distribute IRQs across
244 multiple CPUs. Saying N here will route all IRQs to the first
245 CPU. Generally saying Y is safe, although some problems have been
246 reported with SMP Power Macintoshes with this option enabled.
251 default y if SMP && PPC_PSERIES
256 depends on NEED_MULTIPLE_NODES
258 config ARCH_SELECT_MEMORY_MODEL
262 config ARCH_FLATMEM_ENABLE
264 depends on (PPC64 && !NUMA) || PPC32
266 config ARCH_SPARSEMEM_ENABLE
270 config ARCH_SPARSEMEM_DEFAULT
272 depends on (SMP && PPC_PSERIES) || PPC_PS3
274 config ARCH_POPULATES_NODE_MAP
279 config ARCH_MEMORY_PROBE
281 depends on MEMORY_HOTPLUG
283 # Some NUMA nodes have memory ranges that span
284 # other nodes. Even though a pfn is valid and
285 # between a node's start and end pfns, it may not
286 # reside on that node. See memmap_init_zone()
288 config NODES_SPAN_OTHER_NODES
290 depends on NEED_MULTIPLE_NODES
292 config PPC_HAS_HASH_64K
300 select PPC_HAS_HASH_64K
302 This option changes the kernel logical page size to 64k. On machines
303 without processor support for 64k pages, the kernel will simulate
304 them by loading each individual 4k page on demand transparently,
305 while on hardware with such support, it will be used to map
306 normal application pages.
309 bool "SMT (Hyperthreading) scheduler support"
310 depends on PPC64 && SMP
312 SMT scheduler support improves the CPU scheduler's decision making
313 when dealing with POWER5 cpus at a cost of slightly increased
314 overhead in some places. If unsure say N here.
316 config PROC_DEVICETREE
317 bool "Support for device tree in /proc"
320 This option adds a device-tree directory under /proc which contains
321 an image of the device tree that the kernel copies from Open
322 Firmware or other boot firmware. If unsure, say Y here.
325 bool "Default bootloader kernel arguments"
328 string "Initial kernel command string"
329 depends on CMDLINE_BOOL
330 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
332 On some platforms, there is currently no way for the boot loader to
333 pass arguments to the kernel. For these platforms, you can supply
334 some command-line options at build time by entering them here. In
335 most cases you will need to specify the root device here.
338 source kernel/power/Kconfig
342 bool "Enable seccomp to safely compute untrusted bytecode"
346 This kernel feature is useful for number crunching applications
347 that may need to compute untrusted bytecode during their
348 execution. By using pipes or other transports made available to
349 the process as file descriptors supporting the read/write
350 syscalls, it's possible to isolate those applications in
351 their own address space using seccomp. Once seccomp is
352 enabled via /proc/<pid>/seccomp, it cannot be disabled
353 and the task is only allowed to execute a few safe syscalls
354 defined by each seccomp mode.
356 If unsure, say Y. Only embedded should say N here.
358 config WANT_DEVICE_TREE
363 string "Static device tree source file"
364 depends on WANT_DEVICE_TREE
366 This specifies the device tree source (.dts) file to be
367 compiled and included when building the bootwrapper. If a
368 relative filename is given, then it will be relative to
369 arch/powerpc/boot/dts. If you are not using the bootwrapper,
370 or do not need to build a dts into the bootwrapper, this
373 For example, this is required when building a cuImage target
374 for an older U-Boot, which cannot pass a device tree itself.
375 Such a kernel will not work with a newer U-Boot that tries to
376 pass a device tree (unless you tell it not to). If your U-Boot
377 does not mention a device tree in "help bootm", then use the
378 cuImage target and specify a device tree here. Otherwise, use
379 the uImage target and leave this field blank.
390 bool "Support for ISA-bus hardware"
391 depends on PPC_PREP || PPC_CHRP
394 Find out whether you have ISA slots on your motherboard. ISA is the
395 name of a bus system, i.e. the way the CPU talks to the other stuff
396 inside your box. If you have an Apple machine, say N here; if you
397 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
398 you have an embedded board, consult your board documentation.
404 config GENERIC_ISA_DMA
406 depends on PPC64 || POWER4 || 6xx && !CPM2
409 config PPC_INDIRECT_PCI
412 default y if 40x || 44x
426 select PPC_INDIRECT_PCI
428 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
433 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
434 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
436 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
437 && !PPC_85xx && !PPC_86xx
438 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
439 default PCI_QSPAN if !4xx && !CPM2 && 8xx
440 select ARCH_SUPPORTS_MSI
442 Find out whether your system includes a PCI bus. PCI is the name of
443 a bus system, i.e. the way the CPU talks to the other stuff inside
444 your box. If you say Y here, the kernel will include drivers and
445 infrastructure code to support PCI bus devices.
455 depends on !4xx && !CPM2 && 8xx
458 Say Y here if you have a system based on a Motorola 8xx-series
459 embedded processor with a QSPAN PCI interface, otherwise say N.
463 depends on PCI && 8260
464 select PPC_INDIRECT_PCI
468 bool "Enable workaround for MPC826x erratum PCI 9"
469 depends on PCI_8260 && !ADS8272
473 prompt "IDMA channel for PCI 9 workaround"
476 config 8260_PCI9_IDMA1
479 config 8260_PCI9_IDMA2
482 config 8260_PCI9_IDMA3
485 config 8260_PCI9_IDMA4
490 source "drivers/pci/pcie/Kconfig"
492 source "drivers/pci/Kconfig"
494 source "drivers/pcmcia/Kconfig"
496 source "drivers/pci/hotplug/Kconfig"
500 menu "Advanced setup"
503 config ADVANCED_OPTIONS
504 bool "Prompt for advanced kernel configuration options"
506 This option will enable prompting for a variety of advanced kernel
507 configuration options. These options can cause the kernel to not
508 work if they are set incorrectly, but can be used to optimize certain
509 aspects of kernel memory management.
511 Unless you know what you are doing, say N here.
513 comment "Default settings for advanced configuration options are used"
514 depends on !ADVANCED_OPTIONS
516 config HIGHMEM_START_BOOL
517 bool "Set high memory pool address"
518 depends on ADVANCED_OPTIONS && HIGHMEM
520 This option allows you to set the base address of the kernel virtual
521 area used to map high memory pages. This can be useful in
522 optimizing the layout of kernel virtual memory.
524 Say N here unless you know what you are doing.
527 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
530 config LOWMEM_SIZE_BOOL
531 bool "Set maximum low memory"
532 depends on ADVANCED_OPTIONS
534 This option allows you to set the maximum amount of memory which
535 will be used as "low memory", that is, memory which the kernel can
536 access directly, without having to set up a kernel virtual mapping.
537 This can be useful in optimizing the layout of kernel virtual
540 Say N here unless you know what you are doing.
543 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
546 config KERNEL_START_BOOL
547 bool "Set custom kernel base address"
548 depends on ADVANCED_OPTIONS
550 This option allows you to set the kernel virtual address at which
551 the kernel will map low memory (the kernel image will be linked at
552 this address). This can be useful in optimizing the virtual memory
553 layout of the system.
555 Say N here unless you know what you are doing.
558 hex "Virtual address of kernel base" if KERNEL_START_BOOL
561 config TASK_SIZE_BOOL
562 bool "Set custom user task size"
563 depends on ADVANCED_OPTIONS
565 This option allows you to set the amount of virtual address space
566 allocated to user tasks. This can be useful in optimizing the
567 virtual memory layout of the system.
569 Say N here unless you know what you are doing.
572 hex "Size of user task space" if TASK_SIZE_BOOL
575 config CONSISTENT_START_BOOL
576 bool "Set custom consistent memory pool address"
577 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
579 This option allows you to set the base virtual address
580 of the consistent memory pool. This pool of virtual
581 memory is used to make consistent memory allocations.
583 config CONSISTENT_START
584 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
585 default "0xff100000" if NOT_COHERENT_CACHE
587 config CONSISTENT_SIZE_BOOL
588 bool "Set custom consistent memory pool size"
589 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
591 This option allows you to set the size of the
592 consistent memory pool. This pool of virtual memory
593 is used to make consistent memory allocations.
595 config CONSISTENT_SIZE
596 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
597 default "0x00200000" if NOT_COHERENT_CACHE
599 config BOOT_LOAD_BOOL
600 bool "Set the boot link/load address"
601 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
603 This option allows you to set the initial load address of the zImage
604 or zImage.initrd file. This can be useful if you are on a board
605 which has a small amount of memory.
607 Say N here unless you know what you are doing.
610 hex "Link/load address for booting" if BOOT_LOAD_BOOL
611 default "0x00400000" if 40x || 8xx || 8260
612 default "0x01000000" if 44x
616 bool "Pinned Kernel TLBs (860 ONLY)"
617 depends on ADVANCED_OPTIONS && 8xx
623 default "0xc000000000000000"
628 source "drivers/Kconfig"
632 # XXX source "arch/ppc/8xx_io/Kconfig"
634 # XXX source "arch/ppc/8260_io/Kconfig"
636 source "arch/powerpc/sysdev/qe_lib/Kconfig"
640 menu "Instrumentation Support"
641 depends on EXPERIMENTAL
643 source "arch/powerpc/oprofile/Kconfig"
647 depends on !BOOKE && !4xx && KALLSYMS && MODULES
649 Kprobes allows you to trap at almost any kernel address and
650 execute a callback function. register_kprobe() establishes
651 a probepoint and specifies the callback. Kprobes is useful
652 for kernel debugging, non-intrusive instrumentation and testing.
653 If in doubt, say "N".
656 source "arch/powerpc/Kconfig.debug"
658 source "security/Kconfig"
662 depends on COMPAT && KEYS
665 source "crypto/Kconfig"