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_HARDIRQS
37 config RWSEM_GENERIC_SPINLOCK
40 config RWSEM_XCHGADD_ALGORITHM
44 config ARCH_HAS_ILOG2_U32
48 config ARCH_HAS_ILOG2_U64
52 config GENERIC_HWEIGHT
56 config GENERIC_CALIBRATE_DELAY
60 config GENERIC_FIND_NEXT_BIT
64 config ARCH_NO_VIRT_TO_BUS
81 depends on COMPAT && SYSVIPC
84 # All PPC32s use generic nvram driver through ppc_md
89 config SCHED_NO_NO_OMIT_FRAME_POINTER
93 config ARCH_MAY_HAVE_PC_FDC
95 default !PPC_PSERIES || PCI
103 config PPC_UDBG_16550
107 config GENERIC_TBSYNC
109 default y if PPC32 && SMP
121 config SYS_SUPPORTS_APM_EMULATION
122 default y if PMAC_APM_EMU
125 config DEFAULT_UIMAGE
128 Used to allow a board to specify it wants a uImage built by default
133 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
136 config PPC_DCR_NATIVE
146 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
149 config PPC_OF_PLATFORM_PCI
151 depends on PPC64 # not supported on 32 bits yet
154 source "init/Kconfig"
156 source "arch/powerpc/platforms/Kconfig"
158 menu "Kernel options"
161 bool "High memory support"
164 source kernel/Kconfig.hz
165 source kernel/Kconfig.preempt
166 source "fs/Kconfig.binfmt"
168 # We optimistically allocate largepages from the VM, so make the limit
169 # large enough (16MB). This badly named config option is actually
171 config FORCE_MAX_ZONEORDER
174 default "9" if PPC_64K_PAGES
177 config MATH_EMULATION
178 bool "Math emulation"
179 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
181 Some PowerPC chips designed for embedded applications do not have
182 a floating-point unit and therefore do not implement the
183 floating-point instructions in the PowerPC instruction set. If you
184 say Y here, the kernel will include code to emulate a floating-point
185 unit, which will allow programs that use floating-point
189 bool "Enable IOMMU virtual merging"
193 Cause IO segments sent to a device for DMA to be merged virtually
194 by the IOMMU when they happen to have been allocated contiguously.
195 This doesn't add pressure to the IOMMU allocator. However, some
196 drivers don't support getting large merged segments coming back
199 Most drivers don't have this problem; it is safe to say Y here.
202 bool "Support for enabling/disabling CPUs"
203 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
205 Say Y here to be able to disable and re-enable individual
206 CPUs at runtime on SMP machines.
208 Say N if you are unsure.
210 config ARCH_ENABLE_MEMORY_HOTPLUG
214 bool "kexec system call (EXPERIMENTAL)"
215 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
217 kexec is a system call that implements the ability to shutdown your
218 current kernel, and to start another kernel. It is like a reboot
219 but it is independent of the system firmware. And like a reboot
220 you can start any kernel with it, not just Linux.
222 The name comes from the similarity to the exec system call.
224 It is an ongoing process to be certain the hardware in a machine
225 is properly shutdown, so do not be surprised if this code does not
226 initially work for you. It may help to enable device hotplugging
227 support. As of this writing the exact hardware interface is
228 strongly in flux, so no good recommendation can be made.
231 bool "Build a kdump crash kernel (EXPERIMENTAL)"
232 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
234 Build a kernel suitable for use as a kdump capture kernel.
235 The kernel will be linked at a different address than normal, and
236 so can only be used for Kdump.
238 Don't change this unless you know what you are doing.
241 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
242 default y if PPC_PREP
245 bool "Distribute interrupts on all CPUs by default"
246 depends on SMP && !MV64360
248 This option gives the kernel permission to distribute IRQs across
249 multiple CPUs. Saying N here will route all IRQs to the first
250 CPU. Generally saying Y is safe, although some problems have been
251 reported with SMP Power Macintoshes with this option enabled.
256 default y if SMP && PPC_PSERIES
261 depends on NEED_MULTIPLE_NODES
263 config ARCH_SELECT_MEMORY_MODEL
267 config ARCH_FLATMEM_ENABLE
269 depends on (PPC64 && !NUMA) || PPC32
271 config ARCH_SPARSEMEM_ENABLE
275 config ARCH_SPARSEMEM_DEFAULT
277 depends on (SMP && PPC_PSERIES) || PPC_PS3
279 config ARCH_POPULATES_NODE_MAP
284 config ARCH_MEMORY_PROBE
286 depends on MEMORY_HOTPLUG
288 # Some NUMA nodes have memory ranges that span
289 # other nodes. Even though a pfn is valid and
290 # between a node's start and end pfns, it may not
291 # reside on that node. See memmap_init_zone()
293 config NODES_SPAN_OTHER_NODES
295 depends on NEED_MULTIPLE_NODES
297 config PPC_HAS_HASH_64K
305 select PPC_HAS_HASH_64K
307 This option changes the kernel logical page size to 64k. On machines
308 without processor support for 64k pages, the kernel will simulate
309 them by loading each individual 4k page on demand transparently,
310 while on hardware with such support, it will be used to map
311 normal application pages.
314 bool "SMT (Hyperthreading) scheduler support"
315 depends on PPC64 && SMP
317 SMT scheduler support improves the CPU scheduler's decision making
318 when dealing with POWER5 cpus at a cost of slightly increased
319 overhead in some places. If unsure say N here.
321 config PROC_DEVICETREE
322 bool "Support for device tree in /proc"
325 This option adds a device-tree directory under /proc which contains
326 an image of the device tree that the kernel copies from Open
327 Firmware or other boot firmware. If unsure, say Y here.
330 bool "Default bootloader kernel arguments"
333 string "Initial kernel command string"
334 depends on CMDLINE_BOOL
335 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
337 On some platforms, there is currently no way for the boot loader to
338 pass arguments to the kernel. For these platforms, you can supply
339 some command-line options at build time by entering them here. In
340 most cases you will need to specify the root device here.
343 source kernel/power/Kconfig
347 bool "Enable seccomp to safely compute untrusted bytecode"
351 This kernel feature is useful for number crunching applications
352 that may need to compute untrusted bytecode during their
353 execution. By using pipes or other transports made available to
354 the process as file descriptors supporting the read/write
355 syscalls, it's possible to isolate those applications in
356 their own address space using seccomp. Once seccomp is
357 enabled via /proc/<pid>/seccomp, it cannot be disabled
358 and the task is only allowed to execute a few safe syscalls
359 defined by each seccomp mode.
361 If unsure, say Y. Only embedded should say N here.
363 config WANT_DEVICE_TREE
368 string "Static device tree source file"
369 depends on WANT_DEVICE_TREE
371 This specifies the device tree source (.dts) file to be
372 compiled and included when building the bootwrapper. If a
373 relative filename is given, then it will be relative to
374 arch/powerpc/boot/dts. If you are not using the bootwrapper,
375 or do not need to build a dts into the bootwrapper, this
378 For example, this is required when building a cuImage target
379 for an older U-Boot, which cannot pass a device tree itself.
380 Such a kernel will not work with a newer U-Boot that tries to
381 pass a device tree (unless you tell it not to). If your U-Boot
382 does not mention a device tree in "help bootm", then use the
383 cuImage target and specify a device tree here. Otherwise, use
384 the uImage target and leave this field blank.
395 bool "Support for ISA-bus hardware"
396 depends on PPC_PREP || PPC_CHRP
399 Find out whether you have ISA slots on your motherboard. ISA is the
400 name of a bus system, i.e. the way the CPU talks to the other stuff
401 inside your box. If you have an Apple machine, say N here; if you
402 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
403 you have an embedded board, consult your board documentation.
409 config GENERIC_ISA_DMA
411 depends on PPC64 || POWER4 || 6xx && !CPM2
414 config PPC_INDIRECT_PCI
417 default y if 40x || 44x
431 select PPC_INDIRECT_PCI
433 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
438 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
439 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
441 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
442 && !PPC_85xx && !PPC_86xx
443 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
444 default PCI_QSPAN if !4xx && !CPM2 && 8xx
445 select ARCH_SUPPORTS_MSI
447 Find out whether your system includes a PCI bus. PCI is the name of
448 a bus system, i.e. the way the CPU talks to the other stuff inside
449 your box. If you say Y here, the kernel will include drivers and
450 infrastructure code to support PCI bus devices.
460 depends on !4xx && !CPM2 && 8xx
463 Say Y here if you have a system based on a Motorola 8xx-series
464 embedded processor with a QSPAN PCI interface, otherwise say N.
468 depends on PCI && 8260
469 select PPC_INDIRECT_PCI
473 bool "Enable workaround for MPC826x erratum PCI 9"
474 depends on PCI_8260 && !ADS8272
478 prompt "IDMA channel for PCI 9 workaround"
481 config 8260_PCI9_IDMA1
484 config 8260_PCI9_IDMA2
487 config 8260_PCI9_IDMA3
490 config 8260_PCI9_IDMA4
495 source "drivers/pci/pcie/Kconfig"
497 source "drivers/pci/Kconfig"
499 source "drivers/pcmcia/Kconfig"
501 source "drivers/pci/hotplug/Kconfig"
505 menu "Advanced setup"
508 config ADVANCED_OPTIONS
509 bool "Prompt for advanced kernel configuration options"
511 This option will enable prompting for a variety of advanced kernel
512 configuration options. These options can cause the kernel to not
513 work if they are set incorrectly, but can be used to optimize certain
514 aspects of kernel memory management.
516 Unless you know what you are doing, say N here.
518 comment "Default settings for advanced configuration options are used"
519 depends on !ADVANCED_OPTIONS
521 config HIGHMEM_START_BOOL
522 bool "Set high memory pool address"
523 depends on ADVANCED_OPTIONS && HIGHMEM
525 This option allows you to set the base address of the kernel virtual
526 area used to map high memory pages. This can be useful in
527 optimizing the layout of kernel virtual memory.
529 Say N here unless you know what you are doing.
532 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
535 config LOWMEM_SIZE_BOOL
536 bool "Set maximum low memory"
537 depends on ADVANCED_OPTIONS
539 This option allows you to set the maximum amount of memory which
540 will be used as "low memory", that is, memory which the kernel can
541 access directly, without having to set up a kernel virtual mapping.
542 This can be useful in optimizing the layout of kernel virtual
545 Say N here unless you know what you are doing.
548 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
551 config KERNEL_START_BOOL
552 bool "Set custom kernel base address"
553 depends on ADVANCED_OPTIONS
555 This option allows you to set the kernel virtual address at which
556 the kernel will map low memory (the kernel image will be linked at
557 this address). This can be useful in optimizing the virtual memory
558 layout of the system.
560 Say N here unless you know what you are doing.
563 hex "Virtual address of kernel base" if KERNEL_START_BOOL
566 config TASK_SIZE_BOOL
567 bool "Set custom user task size"
568 depends on ADVANCED_OPTIONS
570 This option allows you to set the amount of virtual address space
571 allocated to user tasks. This can be useful in optimizing the
572 virtual memory layout of the system.
574 Say N here unless you know what you are doing.
577 hex "Size of user task space" if TASK_SIZE_BOOL
580 config CONSISTENT_START_BOOL
581 bool "Set custom consistent memory pool address"
582 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
584 This option allows you to set the base virtual address
585 of the consistent memory pool. This pool of virtual
586 memory is used to make consistent memory allocations.
588 config CONSISTENT_START
589 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
590 default "0xff100000" if NOT_COHERENT_CACHE
592 config CONSISTENT_SIZE_BOOL
593 bool "Set custom consistent memory pool size"
594 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
596 This option allows you to set the size of the
597 consistent memory pool. This pool of virtual memory
598 is used to make consistent memory allocations.
600 config CONSISTENT_SIZE
601 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
602 default "0x00200000" if NOT_COHERENT_CACHE
604 config BOOT_LOAD_BOOL
605 bool "Set the boot link/load address"
606 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
608 This option allows you to set the initial load address of the zImage
609 or zImage.initrd file. This can be useful if you are on a board
610 which has a small amount of memory.
612 Say N here unless you know what you are doing.
615 hex "Link/load address for booting" if BOOT_LOAD_BOOL
616 default "0x00400000" if 40x || 8xx || 8260
617 default "0x01000000" if 44x
621 bool "Pinned Kernel TLBs (860 ONLY)"
622 depends on ADVANCED_OPTIONS && 8xx
628 default "0xc000000000000000"
633 source "drivers/Kconfig"
637 # XXX source "arch/ppc/8xx_io/Kconfig"
639 # XXX source "arch/ppc/8260_io/Kconfig"
641 source "arch/powerpc/sysdev/qe_lib/Kconfig"
645 menu "Instrumentation Support"
646 depends on EXPERIMENTAL
648 source "arch/powerpc/oprofile/Kconfig"
652 depends on !BOOKE && !4xx && KALLSYMS && MODULES
654 Kprobes allows you to trap at almost any kernel address and
655 execute a callback function. register_kprobe() establishes
656 a probepoint and specifies the callback. Kprobes is useful
657 for kernel debugging, non-intrusive instrumentation and testing.
658 If in doubt, say "N".
661 source "arch/powerpc/Kconfig.debug"
663 source "security/Kconfig"
667 depends on COMPAT && KEYS
670 source "crypto/Kconfig"