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 HUGETLB_PAGE_SIZE_VARIABLE
192 depends on HUGETLB_PAGE
195 config MATH_EMULATION
196 bool "Math emulation"
197 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
199 Some PowerPC chips designed for embedded applications do not have
200 a floating-point unit and therefore do not implement the
201 floating-point instructions in the PowerPC instruction set. If you
202 say Y here, the kernel will include code to emulate a floating-point
203 unit, which will allow programs that use floating-point
206 config 8XX_MINIMAL_FPEMU
207 bool "Minimal math emulation for 8xx"
208 depends on 8xx && !MATH_EMULATION
210 Older arch/ppc kernels still emulated a few floating point
211 instructions such as load and store, even when full math
212 emulation is disabled. Say "Y" here if you want to preserve
215 It is recommended that you build a soft-float userspace instead.
218 bool "Enable IOMMU virtual merging"
222 Cause IO segments sent to a device for DMA to be merged virtually
223 by the IOMMU when they happen to have been allocated contiguously.
224 This doesn't add pressure to the IOMMU allocator. However, some
225 drivers don't support getting large merged segments coming back
228 Most drivers don't have this problem; it is safe to say Y here.
231 bool "Support for enabling/disabling CPUs"
232 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
234 Say Y here to be able to disable and re-enable individual
235 CPUs at runtime on SMP machines.
237 Say N if you are unsure.
239 config ARCH_ENABLE_MEMORY_HOTPLUG
243 bool "kexec system call (EXPERIMENTAL)"
244 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
246 kexec is a system call that implements the ability to shutdown your
247 current kernel, and to start another kernel. It is like a reboot
248 but it is independent of the system firmware. And like a reboot
249 you can start any kernel with it, not just Linux.
251 The name comes from the similarity to the exec system call.
253 It is an ongoing process to be certain the hardware in a machine
254 is properly shutdown, so do not be surprised if this code does not
255 initially work for you. It may help to enable device hotplugging
256 support. As of this writing the exact hardware interface is
257 strongly in flux, so no good recommendation can be made.
260 bool "Build a kdump crash kernel (EXPERIMENTAL)"
261 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
263 Build a kernel suitable for use as a kdump capture kernel.
264 The kernel will be linked at a different address than normal, and
265 so can only be used for Kdump.
267 Don't change this unless you know what you are doing.
270 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
271 default y if PPC_PREP
274 bool "Distribute interrupts on all CPUs by default"
275 depends on SMP && !MV64360
277 This option gives the kernel permission to distribute IRQs across
278 multiple CPUs. Saying N here will route all IRQs to the first
279 CPU. Generally saying Y is safe, although some problems have been
280 reported with SMP Power Macintoshes with this option enabled.
285 default y if SMP && PPC_PSERIES
290 depends on NEED_MULTIPLE_NODES
292 config ARCH_SELECT_MEMORY_MODEL
296 config ARCH_FLATMEM_ENABLE
298 depends on (PPC64 && !NUMA) || PPC32
300 config ARCH_SPARSEMEM_ENABLE
303 select SPARSEMEM_VMEMMAP_ENABLE
305 config ARCH_SPARSEMEM_DEFAULT
307 depends on (SMP && PPC_PSERIES) || PPC_PS3
309 config ARCH_POPULATES_NODE_MAP
314 config ARCH_MEMORY_PROBE
316 depends on MEMORY_HOTPLUG
318 # Some NUMA nodes have memory ranges that span
319 # other nodes. Even though a pfn is valid and
320 # between a node's start and end pfns, it may not
321 # reside on that node. See memmap_init_zone()
323 config NODES_SPAN_OTHER_NODES
325 depends on NEED_MULTIPLE_NODES
327 config PPC_HAS_HASH_64K
335 select PPC_HAS_HASH_64K
337 This option changes the kernel logical page size to 64k. On machines
338 without processor support for 64k pages, the kernel will simulate
339 them by loading each individual 4k page on demand transparently,
340 while on hardware with such support, it will be used to map
341 normal application pages.
344 bool "SMT (Hyperthreading) scheduler support"
345 depends on PPC64 && SMP
347 SMT scheduler support improves the CPU scheduler's decision making
348 when dealing with POWER5 cpus at a cost of slightly increased
349 overhead in some places. If unsure say N here.
351 config PROC_DEVICETREE
352 bool "Support for device tree in /proc"
355 This option adds a device-tree directory under /proc which contains
356 an image of the device tree that the kernel copies from Open
357 Firmware or other boot firmware. If unsure, say Y here.
360 bool "Default bootloader kernel arguments"
363 string "Initial kernel command string"
364 depends on CMDLINE_BOOL
365 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
367 On some platforms, there is currently no way for the boot loader to
368 pass arguments to the kernel. For these platforms, you can supply
369 some command-line options at build time by entering them here. In
370 most cases you will need to specify the root device here.
373 source kernel/power/Kconfig
377 bool "Enable seccomp to safely compute untrusted bytecode"
381 This kernel feature is useful for number crunching applications
382 that may need to compute untrusted bytecode during their
383 execution. By using pipes or other transports made available to
384 the process as file descriptors supporting the read/write
385 syscalls, it's possible to isolate those applications in
386 their own address space using seccomp. Once seccomp is
387 enabled via /proc/<pid>/seccomp, it cannot be disabled
388 and the task is only allowed to execute a few safe syscalls
389 defined by each seccomp mode.
391 If unsure, say Y. Only embedded should say N here.
393 config WANT_DEVICE_TREE
398 string "Static device tree source file"
399 depends on WANT_DEVICE_TREE
401 This specifies the device tree source (.dts) file to be
402 compiled and included when building the bootwrapper. If a
403 relative filename is given, then it will be relative to
404 arch/powerpc/boot/dts. If you are not using the bootwrapper,
405 or do not need to build a dts into the bootwrapper, this
408 For example, this is required when building a cuImage target
409 for an older U-Boot, which cannot pass a device tree itself.
410 Such a kernel will not work with a newer U-Boot that tries to
411 pass a device tree (unless you tell it not to). If your U-Boot
412 does not mention a device tree in "help bootm", then use the
413 cuImage target and specify a device tree here. Otherwise, use
414 the uImage target and leave this field blank.
425 bool "Support for ISA-bus hardware"
426 depends on PPC_PREP || PPC_CHRP
429 Find out whether you have ISA slots on your motherboard. ISA is the
430 name of a bus system, i.e. the way the CPU talks to the other stuff
431 inside your box. If you have an Apple machine, say N here; if you
432 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
433 you have an embedded board, consult your board documentation.
439 config GENERIC_ISA_DMA
441 depends on PPC64 || POWER4 || 6xx && !CPM2
444 config PPC_INDIRECT_PCI
447 default y if 40x || 44x
461 select PPC_INDIRECT_PCI
463 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
468 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
469 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
471 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
472 && !PPC_85xx && !PPC_86xx
473 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
474 default PCI_QSPAN if !4xx && !CPM2 && 8xx
475 select ARCH_SUPPORTS_MSI
477 Find out whether your system includes a PCI bus. PCI is the name of
478 a bus system, i.e. the way the CPU talks to the other stuff inside
479 your box. If you say Y here, the kernel will include drivers and
480 infrastructure code to support PCI bus devices.
490 depends on !4xx && !CPM2 && 8xx
493 Say Y here if you have a system based on a Motorola 8xx-series
494 embedded processor with a QSPAN PCI interface, otherwise say N.
498 depends on PCI && 8260
499 select PPC_INDIRECT_PCI
503 bool "Enable workaround for MPC826x erratum PCI 9"
504 depends on PCI_8260 && !8272
508 prompt "IDMA channel for PCI 9 workaround"
511 config 8260_PCI9_IDMA1
514 config 8260_PCI9_IDMA2
517 config 8260_PCI9_IDMA3
520 config 8260_PCI9_IDMA4
525 source "drivers/pci/pcie/Kconfig"
527 source "drivers/pci/Kconfig"
529 source "drivers/pcmcia/Kconfig"
531 source "drivers/pci/hotplug/Kconfig"
535 menu "Advanced setup"
538 config ADVANCED_OPTIONS
539 bool "Prompt for advanced kernel configuration options"
541 This option will enable prompting for a variety of advanced kernel
542 configuration options. These options can cause the kernel to not
543 work if they are set incorrectly, but can be used to optimize certain
544 aspects of kernel memory management.
546 Unless you know what you are doing, say N here.
548 comment "Default settings for advanced configuration options are used"
549 depends on !ADVANCED_OPTIONS
551 config HIGHMEM_START_BOOL
552 bool "Set high memory pool address"
553 depends on ADVANCED_OPTIONS && HIGHMEM
555 This option allows you to set the base address of the kernel virtual
556 area used to map high memory pages. This can be useful in
557 optimizing the layout of kernel virtual memory.
559 Say N here unless you know what you are doing.
562 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
565 config LOWMEM_SIZE_BOOL
566 bool "Set maximum low memory"
567 depends on ADVANCED_OPTIONS
569 This option allows you to set the maximum amount of memory which
570 will be used as "low memory", that is, memory which the kernel can
571 access directly, without having to set up a kernel virtual mapping.
572 This can be useful in optimizing the layout of kernel virtual
575 Say N here unless you know what you are doing.
578 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
581 config KERNEL_START_BOOL
582 bool "Set custom kernel base address"
583 depends on ADVANCED_OPTIONS
585 This option allows you to set the kernel virtual address at which
586 the kernel will map low memory (the kernel image will be linked at
587 this address). This can be useful in optimizing the virtual memory
588 layout of the system.
590 Say N here unless you know what you are doing.
593 hex "Virtual address of kernel base" if KERNEL_START_BOOL
596 config TASK_SIZE_BOOL
597 bool "Set custom user task size"
598 depends on ADVANCED_OPTIONS
600 This option allows you to set the amount of virtual address space
601 allocated to user tasks. This can be useful in optimizing the
602 virtual memory layout of the system.
604 Say N here unless you know what you are doing.
607 hex "Size of user task space" if TASK_SIZE_BOOL
608 default "0x80000000" if PPC_PREP || PPC_8xx
611 config CONSISTENT_START_BOOL
612 bool "Set custom consistent memory pool address"
613 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
615 This option allows you to set the base virtual address
616 of the consistent memory pool. This pool of virtual
617 memory is used to make consistent memory allocations.
619 config CONSISTENT_START
620 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
621 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
622 default "0xff100000" if NOT_COHERENT_CACHE
624 config CONSISTENT_SIZE_BOOL
625 bool "Set custom consistent memory pool size"
626 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
628 This option allows you to set the size of the
629 consistent memory pool. This pool of virtual memory
630 is used to make consistent memory allocations.
632 config CONSISTENT_SIZE
633 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
634 default "0x00200000" if NOT_COHERENT_CACHE
636 config BOOT_LOAD_BOOL
637 bool "Set the boot link/load address"
638 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
640 This option allows you to set the initial load address of the zImage
641 or zImage.initrd file. This can be useful if you are on a board
642 which has a small amount of memory.
644 Say N here unless you know what you are doing.
647 hex "Link/load address for booting" if BOOT_LOAD_BOOL
648 default "0x00400000" if 40x || 8xx || 8260
649 default "0x01000000" if 44x
653 bool "Pinned Kernel TLBs (860 ONLY)"
654 depends on ADVANCED_OPTIONS && 8xx
660 default "0xc000000000000000"
665 source "drivers/Kconfig"
669 # XXX source "arch/ppc/8xx_io/Kconfig"
671 # XXX source "arch/ppc/8260_io/Kconfig"
673 source "arch/powerpc/sysdev/qe_lib/Kconfig"
677 source "kernel/Kconfig.instrumentation"
679 source "arch/powerpc/Kconfig.debug"
681 source "security/Kconfig"
685 depends on COMPAT && KEYS
688 source "crypto/Kconfig"