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_HARDIRQS
46 config RWSEM_GENERIC_SPINLOCK
49 config RWSEM_XCHGADD_ALGORITHM
53 config ARCH_HAS_ILOG2_U32
57 config ARCH_HAS_ILOG2_U64
61 config GENERIC_HWEIGHT
65 config GENERIC_CALIBRATE_DELAY
69 config GENERIC_FIND_NEXT_BIT
73 config ARCH_NO_VIRT_TO_BUS
90 depends on COMPAT && SYSVIPC
93 # All PPC32s use generic nvram driver through ppc_md
98 config SCHED_NO_NO_OMIT_FRAME_POINTER
102 config ARCH_MAY_HAVE_PC_FDC
104 default !PPC_PSERIES || PCI
112 config PPC_UDBG_16550
116 config GENERIC_TBSYNC
118 default y if PPC32 && SMP
130 config SYS_SUPPORTS_APM_EMULATION
131 default y if PMAC_APM_EMU
134 config DEFAULT_UIMAGE
137 Used to allow a board to specify it wants a uImage built by default
142 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
145 config PPC_DCR_NATIVE
155 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
158 config PPC_OF_PLATFORM_PCI
160 depends on PPC64 # not supported on 32 bits yet
163 source "init/Kconfig"
165 source "arch/powerpc/platforms/Kconfig"
167 menu "Kernel options"
170 bool "High memory support"
173 source kernel/Kconfig.hz
174 source kernel/Kconfig.preempt
175 source "fs/Kconfig.binfmt"
177 # We optimistically allocate largepages from the VM, so make the limit
178 # large enough (16MB). This badly named config option is actually
180 config FORCE_MAX_ZONEORDER
183 default "9" if PPC_64K_PAGES
186 config MATH_EMULATION
187 bool "Math emulation"
188 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
190 Some PowerPC chips designed for embedded applications do not have
191 a floating-point unit and therefore do not implement the
192 floating-point instructions in the PowerPC instruction set. If you
193 say Y here, the kernel will include code to emulate a floating-point
194 unit, which will allow programs that use floating-point
198 bool "Enable IOMMU virtual merging"
202 Cause IO segments sent to a device for DMA to be merged virtually
203 by the IOMMU when they happen to have been allocated contiguously.
204 This doesn't add pressure to the IOMMU allocator. However, some
205 drivers don't support getting large merged segments coming back
208 Most drivers don't have this problem; it is safe to say Y here.
211 bool "Support for enabling/disabling CPUs"
212 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
214 Say Y here to be able to disable and re-enable individual
215 CPUs at runtime on SMP machines.
217 Say N if you are unsure.
219 config ARCH_ENABLE_MEMORY_HOTPLUG
223 bool "kexec system call (EXPERIMENTAL)"
224 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
226 kexec is a system call that implements the ability to shutdown your
227 current kernel, and to start another kernel. It is like a reboot
228 but it is independent of the system firmware. And like a reboot
229 you can start any kernel with it, not just Linux.
231 The name comes from the similarity to the exec system call.
233 It is an ongoing process to be certain the hardware in a machine
234 is properly shutdown, so do not be surprised if this code does not
235 initially work for you. It may help to enable device hotplugging
236 support. As of this writing the exact hardware interface is
237 strongly in flux, so no good recommendation can be made.
240 bool "Build a kdump crash kernel (EXPERIMENTAL)"
241 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
243 Build a kernel suitable for use as a kdump capture kernel.
244 The kernel will be linked at a different address than normal, and
245 so can only be used for Kdump.
247 Don't change this unless you know what you are doing.
250 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
251 default y if PPC_PREP
254 bool "Distribute interrupts on all CPUs by default"
255 depends on SMP && !MV64360
257 This option gives the kernel permission to distribute IRQs across
258 multiple CPUs. Saying N here will route all IRQs to the first
259 CPU. Generally saying Y is safe, although some problems have been
260 reported with SMP Power Macintoshes with this option enabled.
265 default y if SMP && PPC_PSERIES
270 depends on NEED_MULTIPLE_NODES
272 config ARCH_SELECT_MEMORY_MODEL
276 config ARCH_FLATMEM_ENABLE
278 depends on (PPC64 && !NUMA) || PPC32
280 config ARCH_SPARSEMEM_ENABLE
284 config ARCH_SPARSEMEM_DEFAULT
286 depends on (SMP && PPC_PSERIES) || PPC_PS3
288 config ARCH_POPULATES_NODE_MAP
293 config ARCH_MEMORY_PROBE
295 depends on MEMORY_HOTPLUG
297 # Some NUMA nodes have memory ranges that span
298 # other nodes. Even though a pfn is valid and
299 # between a node's start and end pfns, it may not
300 # reside on that node. See memmap_init_zone()
302 config NODES_SPAN_OTHER_NODES
304 depends on NEED_MULTIPLE_NODES
306 config PPC_HAS_HASH_64K
314 select PPC_HAS_HASH_64K
316 This option changes the kernel logical page size to 64k. On machines
317 without processor support for 64k pages, the kernel will simulate
318 them by loading each individual 4k page on demand transparently,
319 while on hardware with such support, it will be used to map
320 normal application pages.
323 bool "SMT (Hyperthreading) scheduler support"
324 depends on PPC64 && SMP
326 SMT scheduler support improves the CPU scheduler's decision making
327 when dealing with POWER5 cpus at a cost of slightly increased
328 overhead in some places. If unsure say N here.
330 config PROC_DEVICETREE
331 bool "Support for device tree in /proc"
334 This option adds a device-tree directory under /proc which contains
335 an image of the device tree that the kernel copies from Open
336 Firmware or other boot firmware. If unsure, say Y here.
339 bool "Default bootloader kernel arguments"
342 string "Initial kernel command string"
343 depends on CMDLINE_BOOL
344 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
346 On some platforms, there is currently no way for the boot loader to
347 pass arguments to the kernel. For these platforms, you can supply
348 some command-line options at build time by entering them here. In
349 most cases you will need to specify the root device here.
352 source kernel/power/Kconfig
356 bool "Enable seccomp to safely compute untrusted bytecode"
360 This kernel feature is useful for number crunching applications
361 that may need to compute untrusted bytecode during their
362 execution. By using pipes or other transports made available to
363 the process as file descriptors supporting the read/write
364 syscalls, it's possible to isolate those applications in
365 their own address space using seccomp. Once seccomp is
366 enabled via /proc/<pid>/seccomp, it cannot be disabled
367 and the task is only allowed to execute a few safe syscalls
368 defined by each seccomp mode.
370 If unsure, say Y. Only embedded should say N here.
372 config WANT_DEVICE_TREE
377 string "Static device tree source file"
378 depends on WANT_DEVICE_TREE
380 This specifies the device tree source (.dts) file to be
381 compiled and included when building the bootwrapper. If a
382 relative filename is given, then it will be relative to
383 arch/powerpc/boot/dts. If you are not using the bootwrapper,
384 or do not need to build a dts into the bootwrapper, this
387 For example, this is required when building a cuImage target
388 for an older U-Boot, which cannot pass a device tree itself.
389 Such a kernel will not work with a newer U-Boot that tries to
390 pass a device tree (unless you tell it not to). If your U-Boot
391 does not mention a device tree in "help bootm", then use the
392 cuImage target and specify a device tree here. Otherwise, use
393 the uImage target and leave this field blank.
404 bool "Support for ISA-bus hardware"
405 depends on PPC_PREP || PPC_CHRP
408 Find out whether you have ISA slots on your motherboard. ISA is the
409 name of a bus system, i.e. the way the CPU talks to the other stuff
410 inside your box. If you have an Apple machine, say N here; if you
411 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
412 you have an embedded board, consult your board documentation.
418 config GENERIC_ISA_DMA
420 depends on PPC64 || POWER4 || 6xx && !CPM2
423 config PPC_INDIRECT_PCI
426 default y if 40x || 44x
440 select PPC_INDIRECT_PCI
442 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
447 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
448 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
450 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
451 && !PPC_85xx && !PPC_86xx
452 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
453 default PCI_QSPAN if !4xx && !CPM2 && 8xx
454 select ARCH_SUPPORTS_MSI
456 Find out whether your system includes a PCI bus. PCI is the name of
457 a bus system, i.e. the way the CPU talks to the other stuff inside
458 your box. If you say Y here, the kernel will include drivers and
459 infrastructure code to support PCI bus devices.
469 depends on !4xx && !CPM2 && 8xx
472 Say Y here if you have a system based on a Motorola 8xx-series
473 embedded processor with a QSPAN PCI interface, otherwise say N.
477 depends on PCI && 8260
478 select PPC_INDIRECT_PCI
482 bool "Enable workaround for MPC826x erratum PCI 9"
483 depends on PCI_8260 && !ADS8272
487 prompt "IDMA channel for PCI 9 workaround"
490 config 8260_PCI9_IDMA1
493 config 8260_PCI9_IDMA2
496 config 8260_PCI9_IDMA3
499 config 8260_PCI9_IDMA4
504 source "drivers/pci/pcie/Kconfig"
506 source "drivers/pci/Kconfig"
508 source "drivers/pcmcia/Kconfig"
510 source "drivers/pci/hotplug/Kconfig"
514 menu "Advanced setup"
517 config ADVANCED_OPTIONS
518 bool "Prompt for advanced kernel configuration options"
520 This option will enable prompting for a variety of advanced kernel
521 configuration options. These options can cause the kernel to not
522 work if they are set incorrectly, but can be used to optimize certain
523 aspects of kernel memory management.
525 Unless you know what you are doing, say N here.
527 comment "Default settings for advanced configuration options are used"
528 depends on !ADVANCED_OPTIONS
530 config HIGHMEM_START_BOOL
531 bool "Set high memory pool address"
532 depends on ADVANCED_OPTIONS && HIGHMEM
534 This option allows you to set the base address of the kernel virtual
535 area used to map high memory pages. This can be useful in
536 optimizing the layout of kernel virtual memory.
538 Say N here unless you know what you are doing.
541 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
544 config LOWMEM_SIZE_BOOL
545 bool "Set maximum low memory"
546 depends on ADVANCED_OPTIONS
548 This option allows you to set the maximum amount of memory which
549 will be used as "low memory", that is, memory which the kernel can
550 access directly, without having to set up a kernel virtual mapping.
551 This can be useful in optimizing the layout of kernel virtual
554 Say N here unless you know what you are doing.
557 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
560 config KERNEL_START_BOOL
561 bool "Set custom kernel base address"
562 depends on ADVANCED_OPTIONS
564 This option allows you to set the kernel virtual address at which
565 the kernel will map low memory (the kernel image will be linked at
566 this address). This can be useful in optimizing the virtual memory
567 layout of the system.
569 Say N here unless you know what you are doing.
572 hex "Virtual address of kernel base" if KERNEL_START_BOOL
575 config TASK_SIZE_BOOL
576 bool "Set custom user task size"
577 depends on ADVANCED_OPTIONS
579 This option allows you to set the amount of virtual address space
580 allocated to user tasks. This can be useful in optimizing the
581 virtual memory layout of the system.
583 Say N here unless you know what you are doing.
586 hex "Size of user task space" if TASK_SIZE_BOOL
589 config CONSISTENT_START_BOOL
590 bool "Set custom consistent memory pool address"
591 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
593 This option allows you to set the base virtual address
594 of the consistent memory pool. This pool of virtual
595 memory is used to make consistent memory allocations.
597 config CONSISTENT_START
598 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
599 default "0xff100000" if NOT_COHERENT_CACHE
601 config CONSISTENT_SIZE_BOOL
602 bool "Set custom consistent memory pool size"
603 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
605 This option allows you to set the size of the
606 consistent memory pool. This pool of virtual memory
607 is used to make consistent memory allocations.
609 config CONSISTENT_SIZE
610 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
611 default "0x00200000" if NOT_COHERENT_CACHE
613 config BOOT_LOAD_BOOL
614 bool "Set the boot link/load address"
615 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
617 This option allows you to set the initial load address of the zImage
618 or zImage.initrd file. This can be useful if you are on a board
619 which has a small amount of memory.
621 Say N here unless you know what you are doing.
624 hex "Link/load address for booting" if BOOT_LOAD_BOOL
625 default "0x00400000" if 40x || 8xx || 8260
626 default "0x01000000" if 44x
630 bool "Pinned Kernel TLBs (860 ONLY)"
631 depends on ADVANCED_OPTIONS && 8xx
637 default "0xc000000000000000"
642 source "drivers/Kconfig"
646 # XXX source "arch/ppc/8xx_io/Kconfig"
648 # XXX source "arch/ppc/8260_io/Kconfig"
650 source "arch/powerpc/sysdev/qe_lib/Kconfig"
654 menu "Instrumentation Support"
655 depends on EXPERIMENTAL
657 source "arch/powerpc/oprofile/Kconfig"
661 depends on !BOOKE && !4xx && KALLSYMS && MODULES
663 Kprobes allows you to trap at almost any kernel address and
664 execute a callback function. register_kprobe() establishes
665 a probepoint and specifies the callback. Kprobes is useful
666 for kernel debugging, non-intrusive instrumentation and testing.
667 If in doubt, say "N".
670 source "arch/powerpc/Kconfig.debug"
672 source "security/Kconfig"
676 depends on COMPAT && KEYS
679 source "crypto/Kconfig"