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 (EXPERIMENTAL)"
185 depends on EXPERIMENTAL && PPC64
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
192 from *_map_sg(). Say Y if you know the drivers you are using are
193 properly handling this case.
196 bool "Support for enabling/disabling CPUs"
197 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
199 Say Y here to be able to disable and re-enable individual
200 CPUs at runtime on SMP machines.
202 Say N if you are unsure.
204 config ARCH_ENABLE_MEMORY_HOTPLUG
208 bool "kexec system call (EXPERIMENTAL)"
209 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
211 kexec is a system call that implements the ability to shutdown your
212 current kernel, and to start another kernel. It is like a reboot
213 but it is independent of the system firmware. And like a reboot
214 you can start any kernel with it, not just Linux.
216 The name comes from the similarity to the exec system call.
218 It is an ongoing process to be certain the hardware in a machine
219 is properly shutdown, so do not be surprised if this code does not
220 initially work for you. It may help to enable device hotplugging
221 support. As of this writing the exact hardware interface is
222 strongly in flux, so no good recommendation can be made.
225 bool "Build a kdump crash kernel (EXPERIMENTAL)"
226 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
228 Build a kernel suitable for use as a kdump capture kernel.
229 The kernel will be linked at a different address than normal, and
230 so can only be used for Kdump.
232 Don't change this unless you know what you are doing.
235 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
236 default y if PPC_PREP
239 bool "Distribute interrupts on all CPUs by default"
240 depends on SMP && !MV64360
242 This option gives the kernel permission to distribute IRQs across
243 multiple CPUs. Saying N here will route all IRQs to the first
244 CPU. Generally saying Y is safe, although some problems have been
245 reported with SMP Power Macintoshes with this option enabled.
250 default y if SMP && PPC_PSERIES
255 depends on NEED_MULTIPLE_NODES
257 config ARCH_SELECT_MEMORY_MODEL
261 config ARCH_FLATMEM_ENABLE
263 depends on (PPC64 && !NUMA) || PPC32
265 config ARCH_SPARSEMEM_ENABLE
269 config ARCH_SPARSEMEM_DEFAULT
271 depends on (SMP && PPC_PSERIES) || PPC_PS3
273 config ARCH_POPULATES_NODE_MAP
278 config ARCH_MEMORY_PROBE
280 depends on MEMORY_HOTPLUG
282 # Some NUMA nodes have memory ranges that span
283 # other nodes. Even though a pfn is valid and
284 # between a node's start and end pfns, it may not
285 # reside on that node. See memmap_init_zone()
287 config NODES_SPAN_OTHER_NODES
289 depends on NEED_MULTIPLE_NODES
291 config PPC_HAS_HASH_64K
299 select PPC_HAS_HASH_64K
301 This option changes the kernel logical page size to 64k. On machines
302 without processor support for 64k pages, the kernel will simulate
303 them by loading each individual 4k page on demand transparently,
304 while on hardware with such support, it will be used to map
305 normal application pages.
308 bool "SMT (Hyperthreading) scheduler support"
309 depends on PPC64 && SMP
311 SMT scheduler support improves the CPU scheduler's decision making
312 when dealing with POWER5 cpus at a cost of slightly increased
313 overhead in some places. If unsure say N here.
315 config PROC_DEVICETREE
316 bool "Support for device tree in /proc"
319 This option adds a device-tree directory under /proc which contains
320 an image of the device tree that the kernel copies from Open
321 Firmware or other boot firmware. If unsure, say Y here.
324 bool "Default bootloader kernel arguments"
327 string "Initial kernel command string"
328 depends on CMDLINE_BOOL
329 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
331 On some platforms, there is currently no way for the boot loader to
332 pass arguments to the kernel. For these platforms, you can supply
333 some command-line options at build time by entering them here. In
334 most cases you will need to specify the root device here.
337 source kernel/power/Kconfig
341 bool "Enable seccomp to safely compute untrusted bytecode"
345 This kernel feature is useful for number crunching applications
346 that may need to compute untrusted bytecode during their
347 execution. By using pipes or other transports made available to
348 the process as file descriptors supporting the read/write
349 syscalls, it's possible to isolate those applications in
350 their own address space using seccomp. Once seccomp is
351 enabled via /proc/<pid>/seccomp, it cannot be disabled
352 and the task is only allowed to execute a few safe syscalls
353 defined by each seccomp mode.
355 If unsure, say Y. Only embedded should say N here.
357 config WANT_DEVICE_TREE
362 string "Static device tree source file"
363 depends on WANT_DEVICE_TREE
365 This specifies the device tree source (.dts) file to be
366 compiled and included when building the bootwrapper. If a
367 relative filename is given, then it will be relative to
368 arch/powerpc/boot/dts. If you are not using the bootwrapper,
369 or do not need to build a dts into the bootwrapper, this
372 For example, this is required when building a cuImage target
373 for an older U-Boot, which cannot pass a device tree itself.
374 Such a kernel will not work with a newer U-Boot that tries to
375 pass a device tree (unless you tell it not to). If your U-Boot
376 does not mention a device tree in "help bootm", then use the
377 cuImage target and specify a device tree here. Otherwise, use
378 the uImage target and leave this field blank.
389 bool "Support for ISA-bus hardware"
390 depends on PPC_PREP || PPC_CHRP
393 Find out whether you have ISA slots on your motherboard. ISA is the
394 name of a bus system, i.e. the way the CPU talks to the other stuff
395 inside your box. If you have an Apple machine, say N here; if you
396 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
397 you have an embedded board, consult your board documentation.
403 config GENERIC_ISA_DMA
405 depends on PPC64 || POWER4 || 6xx && !CPM2
408 config PPC_INDIRECT_PCI
411 default y if 40x || 44x
414 config PPC_INDIRECT_PCI_BE
416 depends PPC_INDIRECT_PCI
430 select PPC_INDIRECT_PCI
432 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
437 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
438 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
440 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
441 && !PPC_85xx && !PPC_86xx
442 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
443 default PCI_QSPAN if !4xx && !CPM2 && 8xx
444 select ARCH_SUPPORTS_MSI
446 Find out whether your system includes a PCI bus. PCI is the name of
447 a bus system, i.e. the way the CPU talks to the other stuff inside
448 your box. If you say Y here, the kernel will include drivers and
449 infrastructure code to support PCI bus devices.
459 depends on !4xx && !CPM2 && 8xx
462 Say Y here if you have a system based on a Motorola 8xx-series
463 embedded processor with a QSPAN PCI interface, otherwise say N.
467 depends on PCI && 8260
468 select PPC_INDIRECT_PCI
472 bool "Enable workaround for MPC826x erratum PCI 9"
473 depends on PCI_8260 && !ADS8272
477 prompt "IDMA channel for PCI 9 workaround"
480 config 8260_PCI9_IDMA1
483 config 8260_PCI9_IDMA2
486 config 8260_PCI9_IDMA3
489 config 8260_PCI9_IDMA4
494 source "drivers/pci/pcie/Kconfig"
496 source "drivers/pci/Kconfig"
498 source "drivers/pcmcia/Kconfig"
500 source "drivers/pci/hotplug/Kconfig"
504 menu "Advanced setup"
507 config ADVANCED_OPTIONS
508 bool "Prompt for advanced kernel configuration options"
510 This option will enable prompting for a variety of advanced kernel
511 configuration options. These options can cause the kernel to not
512 work if they are set incorrectly, but can be used to optimize certain
513 aspects of kernel memory management.
515 Unless you know what you are doing, say N here.
517 comment "Default settings for advanced configuration options are used"
518 depends on !ADVANCED_OPTIONS
520 config HIGHMEM_START_BOOL
521 bool "Set high memory pool address"
522 depends on ADVANCED_OPTIONS && HIGHMEM
524 This option allows you to set the base address of the kernel virtual
525 area used to map high memory pages. This can be useful in
526 optimizing the layout of kernel virtual memory.
528 Say N here unless you know what you are doing.
531 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
534 config LOWMEM_SIZE_BOOL
535 bool "Set maximum low memory"
536 depends on ADVANCED_OPTIONS
538 This option allows you to set the maximum amount of memory which
539 will be used as "low memory", that is, memory which the kernel can
540 access directly, without having to set up a kernel virtual mapping.
541 This can be useful in optimizing the layout of kernel virtual
544 Say N here unless you know what you are doing.
547 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
550 config KERNEL_START_BOOL
551 bool "Set custom kernel base address"
552 depends on ADVANCED_OPTIONS
554 This option allows you to set the kernel virtual address at which
555 the kernel will map low memory (the kernel image will be linked at
556 this address). This can be useful in optimizing the virtual memory
557 layout of the system.
559 Say N here unless you know what you are doing.
562 hex "Virtual address of kernel base" if KERNEL_START_BOOL
565 config TASK_SIZE_BOOL
566 bool "Set custom user task size"
567 depends on ADVANCED_OPTIONS
569 This option allows you to set the amount of virtual address space
570 allocated to user tasks. This can be useful in optimizing the
571 virtual memory layout of the system.
573 Say N here unless you know what you are doing.
576 hex "Size of user task space" if TASK_SIZE_BOOL
579 config CONSISTENT_START_BOOL
580 bool "Set custom consistent memory pool address"
581 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
583 This option allows you to set the base virtual address
584 of the consistent memory pool. This pool of virtual
585 memory is used to make consistent memory allocations.
587 config CONSISTENT_START
588 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
589 default "0xff100000" if NOT_COHERENT_CACHE
591 config CONSISTENT_SIZE_BOOL
592 bool "Set custom consistent memory pool size"
593 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
595 This option allows you to set the size of the
596 consistent memory pool. This pool of virtual memory
597 is used to make consistent memory allocations.
599 config CONSISTENT_SIZE
600 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
601 default "0x00200000" if NOT_COHERENT_CACHE
603 config BOOT_LOAD_BOOL
604 bool "Set the boot link/load address"
605 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
607 This option allows you to set the initial load address of the zImage
608 or zImage.initrd file. This can be useful if you are on a board
609 which has a small amount of memory.
611 Say N here unless you know what you are doing.
614 hex "Link/load address for booting" if BOOT_LOAD_BOOL
615 default "0x00400000" if 40x || 8xx || 8260
616 default "0x01000000" if 44x
620 bool "Pinned Kernel TLBs (860 ONLY)"
621 depends on ADVANCED_OPTIONS && 8xx
627 default "0xc000000000000000"
632 source "drivers/Kconfig"
636 # XXX source "arch/ppc/8xx_io/Kconfig"
638 # XXX source "arch/ppc/8260_io/Kconfig"
640 source "arch/powerpc/sysdev/qe_lib/Kconfig"
644 menu "Instrumentation Support"
645 depends on EXPERIMENTAL
647 source "arch/powerpc/oprofile/Kconfig"
651 depends on !BOOKE && !4xx && KALLSYMS && MODULES
653 Kprobes allows you to trap at almost any kernel address and
654 execute a callback function. register_kprobe() establishes
655 a probepoint and specifies the callback. Kprobes is useful
656 for kernel debugging, non-intrusive instrumentation and testing.
657 If in doubt, say "N".
660 source "arch/powerpc/Kconfig.debug"
662 source "security/Kconfig"
666 depends on COMPAT && KEYS
669 source "crypto/Kconfig"