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
49 config RWSEM_GENERIC_SPINLOCK
52 config RWSEM_XCHGADD_ALGORITHM
56 config ARCH_HAS_ILOG2_U32
60 config ARCH_HAS_ILOG2_U64
64 config GENERIC_HWEIGHT
68 config GENERIC_CALIBRATE_DELAY
72 config GENERIC_FIND_NEXT_BIT
76 config ARCH_NO_VIRT_TO_BUS
93 depends on COMPAT && SYSVIPC
96 # All PPC32s use generic nvram driver through ppc_md
101 config SCHED_NO_NO_OMIT_FRAME_POINTER
105 config ARCH_MAY_HAVE_PC_FDC
107 default !PPC_PSERIES || PCI
115 config PPC_UDBG_16550
119 config GENERIC_TBSYNC
121 default y if PPC32 && SMP
133 config SYS_SUPPORTS_APM_EMULATION
134 default y if PMAC_APM_EMU
137 config DEFAULT_UIMAGE
140 Used to allow a board to specify it wants a uImage built by default
145 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
148 config PPC_DCR_NATIVE
158 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
161 config PPC_OF_PLATFORM_PCI
163 depends on PPC64 # not supported on 32 bits yet
166 source "init/Kconfig"
168 source "arch/powerpc/platforms/Kconfig"
170 menu "Kernel options"
173 bool "High memory support"
176 source kernel/time/Kconfig
177 source kernel/Kconfig.hz
178 source kernel/Kconfig.preempt
179 source "fs/Kconfig.binfmt"
181 # We optimistically allocate largepages from the VM, so make the limit
182 # large enough (16MB). This badly named config option is actually
184 config FORCE_MAX_ZONEORDER
187 default "9" if PPC_64K_PAGES
190 config MATH_EMULATION
191 bool "Math emulation"
192 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
194 Some PowerPC chips designed for embedded applications do not have
195 a floating-point unit and therefore do not implement the
196 floating-point instructions in the PowerPC instruction set. If you
197 say Y here, the kernel will include code to emulate a floating-point
198 unit, which will allow programs that use floating-point
202 bool "Enable IOMMU virtual merging"
206 Cause IO segments sent to a device for DMA to be merged virtually
207 by the IOMMU when they happen to have been allocated contiguously.
208 This doesn't add pressure to the IOMMU allocator. However, some
209 drivers don't support getting large merged segments coming back
212 Most drivers don't have this problem; it is safe to say Y here.
215 bool "Support for enabling/disabling CPUs"
216 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
218 Say Y here to be able to disable and re-enable individual
219 CPUs at runtime on SMP machines.
221 Say N if you are unsure.
223 config ARCH_ENABLE_MEMORY_HOTPLUG
227 bool "kexec system call (EXPERIMENTAL)"
228 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
230 kexec is a system call that implements the ability to shutdown your
231 current kernel, and to start another kernel. It is like a reboot
232 but it is independent of the system firmware. And like a reboot
233 you can start any kernel with it, not just Linux.
235 The name comes from the similarity to the exec system call.
237 It is an ongoing process to be certain the hardware in a machine
238 is properly shutdown, so do not be surprised if this code does not
239 initially work for you. It may help to enable device hotplugging
240 support. As of this writing the exact hardware interface is
241 strongly in flux, so no good recommendation can be made.
244 bool "Build a kdump crash kernel (EXPERIMENTAL)"
245 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
247 Build a kernel suitable for use as a kdump capture kernel.
248 The kernel will be linked at a different address than normal, and
249 so can only be used for Kdump.
251 Don't change this unless you know what you are doing.
254 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
255 default y if PPC_PREP
258 bool "Distribute interrupts on all CPUs by default"
259 depends on SMP && !MV64360
261 This option gives the kernel permission to distribute IRQs across
262 multiple CPUs. Saying N here will route all IRQs to the first
263 CPU. Generally saying Y is safe, although some problems have been
264 reported with SMP Power Macintoshes with this option enabled.
269 default y if SMP && PPC_PSERIES
274 depends on NEED_MULTIPLE_NODES
276 config ARCH_SELECT_MEMORY_MODEL
280 config ARCH_FLATMEM_ENABLE
282 depends on (PPC64 && !NUMA) || PPC32
284 config ARCH_SPARSEMEM_ENABLE
288 config ARCH_SPARSEMEM_DEFAULT
290 depends on (SMP && PPC_PSERIES) || PPC_PS3
292 config ARCH_POPULATES_NODE_MAP
297 config ARCH_MEMORY_PROBE
299 depends on MEMORY_HOTPLUG
301 # Some NUMA nodes have memory ranges that span
302 # other nodes. Even though a pfn is valid and
303 # between a node's start and end pfns, it may not
304 # reside on that node. See memmap_init_zone()
306 config NODES_SPAN_OTHER_NODES
308 depends on NEED_MULTIPLE_NODES
310 config PPC_HAS_HASH_64K
318 select PPC_HAS_HASH_64K
320 This option changes the kernel logical page size to 64k. On machines
321 without processor support for 64k pages, the kernel will simulate
322 them by loading each individual 4k page on demand transparently,
323 while on hardware with such support, it will be used to map
324 normal application pages.
327 bool "SMT (Hyperthreading) scheduler support"
328 depends on PPC64 && SMP
330 SMT scheduler support improves the CPU scheduler's decision making
331 when dealing with POWER5 cpus at a cost of slightly increased
332 overhead in some places. If unsure say N here.
334 config PROC_DEVICETREE
335 bool "Support for device tree in /proc"
338 This option adds a device-tree directory under /proc which contains
339 an image of the device tree that the kernel copies from Open
340 Firmware or other boot firmware. If unsure, say Y here.
343 bool "Default bootloader kernel arguments"
346 string "Initial kernel command string"
347 depends on CMDLINE_BOOL
348 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
350 On some platforms, there is currently no way for the boot loader to
351 pass arguments to the kernel. For these platforms, you can supply
352 some command-line options at build time by entering them here. In
353 most cases you will need to specify the root device here.
356 source kernel/power/Kconfig
360 bool "Enable seccomp to safely compute untrusted bytecode"
364 This kernel feature is useful for number crunching applications
365 that may need to compute untrusted bytecode during their
366 execution. By using pipes or other transports made available to
367 the process as file descriptors supporting the read/write
368 syscalls, it's possible to isolate those applications in
369 their own address space using seccomp. Once seccomp is
370 enabled via /proc/<pid>/seccomp, it cannot be disabled
371 and the task is only allowed to execute a few safe syscalls
372 defined by each seccomp mode.
374 If unsure, say Y. Only embedded should say N here.
376 config WANT_DEVICE_TREE
381 string "Static device tree source file"
382 depends on WANT_DEVICE_TREE
384 This specifies the device tree source (.dts) file to be
385 compiled and included when building the bootwrapper. If a
386 relative filename is given, then it will be relative to
387 arch/powerpc/boot/dts. If you are not using the bootwrapper,
388 or do not need to build a dts into the bootwrapper, this
391 For example, this is required when building a cuImage target
392 for an older U-Boot, which cannot pass a device tree itself.
393 Such a kernel will not work with a newer U-Boot that tries to
394 pass a device tree (unless you tell it not to). If your U-Boot
395 does not mention a device tree in "help bootm", then use the
396 cuImage target and specify a device tree here. Otherwise, use
397 the uImage target and leave this field blank.
408 bool "Support for ISA-bus hardware"
409 depends on PPC_PREP || PPC_CHRP
412 Find out whether you have ISA slots on your motherboard. ISA is the
413 name of a bus system, i.e. the way the CPU talks to the other stuff
414 inside your box. If you have an Apple machine, say N here; if you
415 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
416 you have an embedded board, consult your board documentation.
422 config GENERIC_ISA_DMA
424 depends on PPC64 || POWER4 || 6xx && !CPM2
427 config PPC_INDIRECT_PCI
430 default y if 40x || 44x
444 select PPC_INDIRECT_PCI
446 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
451 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
452 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
454 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
455 && !PPC_85xx && !PPC_86xx
456 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
457 default PCI_QSPAN if !4xx && !CPM2 && 8xx
458 select ARCH_SUPPORTS_MSI
460 Find out whether your system includes a PCI bus. PCI is the name of
461 a bus system, i.e. the way the CPU talks to the other stuff inside
462 your box. If you say Y here, the kernel will include drivers and
463 infrastructure code to support PCI bus devices.
473 depends on !4xx && !CPM2 && 8xx
476 Say Y here if you have a system based on a Motorola 8xx-series
477 embedded processor with a QSPAN PCI interface, otherwise say N.
481 depends on PCI && 8260
482 select PPC_INDIRECT_PCI
486 bool "Enable workaround for MPC826x erratum PCI 9"
487 depends on PCI_8260 && !ADS8272
491 prompt "IDMA channel for PCI 9 workaround"
494 config 8260_PCI9_IDMA1
497 config 8260_PCI9_IDMA2
500 config 8260_PCI9_IDMA3
503 config 8260_PCI9_IDMA4
508 source "drivers/pci/pcie/Kconfig"
510 source "drivers/pci/Kconfig"
512 source "drivers/pcmcia/Kconfig"
514 source "drivers/pci/hotplug/Kconfig"
518 menu "Advanced setup"
521 config ADVANCED_OPTIONS
522 bool "Prompt for advanced kernel configuration options"
524 This option will enable prompting for a variety of advanced kernel
525 configuration options. These options can cause the kernel to not
526 work if they are set incorrectly, but can be used to optimize certain
527 aspects of kernel memory management.
529 Unless you know what you are doing, say N here.
531 comment "Default settings for advanced configuration options are used"
532 depends on !ADVANCED_OPTIONS
534 config HIGHMEM_START_BOOL
535 bool "Set high memory pool address"
536 depends on ADVANCED_OPTIONS && HIGHMEM
538 This option allows you to set the base address of the kernel virtual
539 area used to map high memory pages. This can be useful in
540 optimizing the layout of kernel virtual memory.
542 Say N here unless you know what you are doing.
545 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
548 config LOWMEM_SIZE_BOOL
549 bool "Set maximum low memory"
550 depends on ADVANCED_OPTIONS
552 This option allows you to set the maximum amount of memory which
553 will be used as "low memory", that is, memory which the kernel can
554 access directly, without having to set up a kernel virtual mapping.
555 This can be useful in optimizing the layout of kernel virtual
558 Say N here unless you know what you are doing.
561 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
564 config KERNEL_START_BOOL
565 bool "Set custom kernel base address"
566 depends on ADVANCED_OPTIONS
568 This option allows you to set the kernel virtual address at which
569 the kernel will map low memory (the kernel image will be linked at
570 this address). This can be useful in optimizing the virtual memory
571 layout of the system.
573 Say N here unless you know what you are doing.
576 hex "Virtual address of kernel base" if KERNEL_START_BOOL
579 config TASK_SIZE_BOOL
580 bool "Set custom user task size"
581 depends on ADVANCED_OPTIONS
583 This option allows you to set the amount of virtual address space
584 allocated to user tasks. This can be useful in optimizing the
585 virtual memory layout of the system.
587 Say N here unless you know what you are doing.
590 hex "Size of user task space" if TASK_SIZE_BOOL
593 config CONSISTENT_START_BOOL
594 bool "Set custom consistent memory pool address"
595 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
597 This option allows you to set the base virtual address
598 of the consistent memory pool. This pool of virtual
599 memory is used to make consistent memory allocations.
601 config CONSISTENT_START
602 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
603 default "0xff100000" if NOT_COHERENT_CACHE
605 config CONSISTENT_SIZE_BOOL
606 bool "Set custom consistent memory pool size"
607 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
609 This option allows you to set the size of the
610 consistent memory pool. This pool of virtual memory
611 is used to make consistent memory allocations.
613 config CONSISTENT_SIZE
614 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
615 default "0x00200000" if NOT_COHERENT_CACHE
617 config BOOT_LOAD_BOOL
618 bool "Set the boot link/load address"
619 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
621 This option allows you to set the initial load address of the zImage
622 or zImage.initrd file. This can be useful if you are on a board
623 which has a small amount of memory.
625 Say N here unless you know what you are doing.
628 hex "Link/load address for booting" if BOOT_LOAD_BOOL
629 default "0x00400000" if 40x || 8xx || 8260
630 default "0x01000000" if 44x
634 bool "Pinned Kernel TLBs (860 ONLY)"
635 depends on ADVANCED_OPTIONS && 8xx
641 default "0xc000000000000000"
646 source "drivers/Kconfig"
650 # XXX source "arch/ppc/8xx_io/Kconfig"
652 # XXX source "arch/ppc/8260_io/Kconfig"
654 source "arch/powerpc/sysdev/qe_lib/Kconfig"
658 menu "Instrumentation Support"
659 depends on EXPERIMENTAL
661 source "arch/powerpc/oprofile/Kconfig"
665 depends on !BOOKE && !4xx && KALLSYMS && MODULES
667 Kprobes allows you to trap at almost any kernel address and
668 execute a callback function. register_kprobe() establishes
669 a probepoint and specifies the callback. Kprobes is useful
670 for kernel debugging, non-intrusive instrumentation and testing.
671 If in doubt, say "N".
674 source "arch/powerpc/Kconfig.debug"
676 source "security/Kconfig"
680 depends on COMPAT && KEYS
683 source "crypto/Kconfig"