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
201 config 8XX_MINIMAL_FPEMU
202 bool "Minimal math emulation for 8xx"
203 depends on 8xx && !MATH_EMULATION
205 Older arch/ppc kernels still emulated a few floating point
206 instructions such as load and store, even when full math
207 emulation is disabled. Say "Y" here if you want to preserve
210 It is recommended that you build a soft-float userspace instead.
213 bool "Enable IOMMU virtual merging"
217 Cause IO segments sent to a device for DMA to be merged virtually
218 by the IOMMU when they happen to have been allocated contiguously.
219 This doesn't add pressure to the IOMMU allocator. However, some
220 drivers don't support getting large merged segments coming back
223 Most drivers don't have this problem; it is safe to say Y here.
226 bool "Support for enabling/disabling CPUs"
227 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
229 Say Y here to be able to disable and re-enable individual
230 CPUs at runtime on SMP machines.
232 Say N if you are unsure.
234 config ARCH_ENABLE_MEMORY_HOTPLUG
238 bool "kexec system call (EXPERIMENTAL)"
239 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
241 kexec is a system call that implements the ability to shutdown your
242 current kernel, and to start another kernel. It is like a reboot
243 but it is independent of the system firmware. And like a reboot
244 you can start any kernel with it, not just Linux.
246 The name comes from the similarity to the exec system call.
248 It is an ongoing process to be certain the hardware in a machine
249 is properly shutdown, so do not be surprised if this code does not
250 initially work for you. It may help to enable device hotplugging
251 support. As of this writing the exact hardware interface is
252 strongly in flux, so no good recommendation can be made.
255 bool "Build a kdump crash kernel (EXPERIMENTAL)"
256 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
258 Build a kernel suitable for use as a kdump capture kernel.
259 The kernel will be linked at a different address than normal, and
260 so can only be used for Kdump.
262 Don't change this unless you know what you are doing.
265 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
266 default y if PPC_PREP
269 bool "Distribute interrupts on all CPUs by default"
270 depends on SMP && !MV64360
272 This option gives the kernel permission to distribute IRQs across
273 multiple CPUs. Saying N here will route all IRQs to the first
274 CPU. Generally saying Y is safe, although some problems have been
275 reported with SMP Power Macintoshes with this option enabled.
280 default y if SMP && PPC_PSERIES
285 depends on NEED_MULTIPLE_NODES
287 config ARCH_SELECT_MEMORY_MODEL
291 config ARCH_FLATMEM_ENABLE
293 depends on (PPC64 && !NUMA) || PPC32
295 config ARCH_SPARSEMEM_ENABLE
298 select SPARSEMEM_VMEMMAP_ENABLE
300 config ARCH_SPARSEMEM_DEFAULT
302 depends on (SMP && PPC_PSERIES) || PPC_PS3
304 config ARCH_POPULATES_NODE_MAP
309 config ARCH_MEMORY_PROBE
311 depends on MEMORY_HOTPLUG
313 # Some NUMA nodes have memory ranges that span
314 # other nodes. Even though a pfn is valid and
315 # between a node's start and end pfns, it may not
316 # reside on that node. See memmap_init_zone()
318 config NODES_SPAN_OTHER_NODES
320 depends on NEED_MULTIPLE_NODES
322 config PPC_HAS_HASH_64K
330 select PPC_HAS_HASH_64K
332 This option changes the kernel logical page size to 64k. On machines
333 without processor support for 64k pages, the kernel will simulate
334 them by loading each individual 4k page on demand transparently,
335 while on hardware with such support, it will be used to map
336 normal application pages.
339 bool "SMT (Hyperthreading) scheduler support"
340 depends on PPC64 && SMP
342 SMT scheduler support improves the CPU scheduler's decision making
343 when dealing with POWER5 cpus at a cost of slightly increased
344 overhead in some places. If unsure say N here.
346 config PROC_DEVICETREE
347 bool "Support for device tree in /proc"
350 This option adds a device-tree directory under /proc which contains
351 an image of the device tree that the kernel copies from Open
352 Firmware or other boot firmware. If unsure, say Y here.
355 bool "Default bootloader kernel arguments"
358 string "Initial kernel command string"
359 depends on CMDLINE_BOOL
360 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
362 On some platforms, there is currently no way for the boot loader to
363 pass arguments to the kernel. For these platforms, you can supply
364 some command-line options at build time by entering them here. In
365 most cases you will need to specify the root device here.
368 source kernel/power/Kconfig
372 bool "Enable seccomp to safely compute untrusted bytecode"
376 This kernel feature is useful for number crunching applications
377 that may need to compute untrusted bytecode during their
378 execution. By using pipes or other transports made available to
379 the process as file descriptors supporting the read/write
380 syscalls, it's possible to isolate those applications in
381 their own address space using seccomp. Once seccomp is
382 enabled via /proc/<pid>/seccomp, it cannot be disabled
383 and the task is only allowed to execute a few safe syscalls
384 defined by each seccomp mode.
386 If unsure, say Y. Only embedded should say N here.
388 config WANT_DEVICE_TREE
393 string "Static device tree source file"
394 depends on WANT_DEVICE_TREE
396 This specifies the device tree source (.dts) file to be
397 compiled and included when building the bootwrapper. If a
398 relative filename is given, then it will be relative to
399 arch/powerpc/boot/dts. If you are not using the bootwrapper,
400 or do not need to build a dts into the bootwrapper, this
403 For example, this is required when building a cuImage target
404 for an older U-Boot, which cannot pass a device tree itself.
405 Such a kernel will not work with a newer U-Boot that tries to
406 pass a device tree (unless you tell it not to). If your U-Boot
407 does not mention a device tree in "help bootm", then use the
408 cuImage target and specify a device tree here. Otherwise, use
409 the uImage target and leave this field blank.
420 bool "Support for ISA-bus hardware"
421 depends on PPC_PREP || PPC_CHRP
424 Find out whether you have ISA slots on your motherboard. ISA is the
425 name of a bus system, i.e. the way the CPU talks to the other stuff
426 inside your box. If you have an Apple machine, say N here; if you
427 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
428 you have an embedded board, consult your board documentation.
434 config GENERIC_ISA_DMA
436 depends on PPC64 || POWER4 || 6xx && !CPM2
439 config PPC_INDIRECT_PCI
442 default y if 40x || 44x
456 select PPC_INDIRECT_PCI
458 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
463 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
464 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
466 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
467 && !PPC_85xx && !PPC_86xx
468 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
469 default PCI_QSPAN if !4xx && !CPM2 && 8xx
470 select ARCH_SUPPORTS_MSI
472 Find out whether your system includes a PCI bus. PCI is the name of
473 a bus system, i.e. the way the CPU talks to the other stuff inside
474 your box. If you say Y here, the kernel will include drivers and
475 infrastructure code to support PCI bus devices.
485 depends on !4xx && !CPM2 && 8xx
488 Say Y here if you have a system based on a Motorola 8xx-series
489 embedded processor with a QSPAN PCI interface, otherwise say N.
493 depends on PCI && 8260
494 select PPC_INDIRECT_PCI
498 bool "Enable workaround for MPC826x erratum PCI 9"
499 depends on PCI_8260 && !8272
503 prompt "IDMA channel for PCI 9 workaround"
506 config 8260_PCI9_IDMA1
509 config 8260_PCI9_IDMA2
512 config 8260_PCI9_IDMA3
515 config 8260_PCI9_IDMA4
520 source "drivers/pci/pcie/Kconfig"
522 source "drivers/pci/Kconfig"
524 source "drivers/pcmcia/Kconfig"
526 source "drivers/pci/hotplug/Kconfig"
530 menu "Advanced setup"
533 config ADVANCED_OPTIONS
534 bool "Prompt for advanced kernel configuration options"
536 This option will enable prompting for a variety of advanced kernel
537 configuration options. These options can cause the kernel to not
538 work if they are set incorrectly, but can be used to optimize certain
539 aspects of kernel memory management.
541 Unless you know what you are doing, say N here.
543 comment "Default settings for advanced configuration options are used"
544 depends on !ADVANCED_OPTIONS
546 config HIGHMEM_START_BOOL
547 bool "Set high memory pool address"
548 depends on ADVANCED_OPTIONS && HIGHMEM
550 This option allows you to set the base address of the kernel virtual
551 area used to map high memory pages. This can be useful in
552 optimizing the layout of kernel virtual memory.
554 Say N here unless you know what you are doing.
557 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
560 config LOWMEM_SIZE_BOOL
561 bool "Set maximum low memory"
562 depends on ADVANCED_OPTIONS
564 This option allows you to set the maximum amount of memory which
565 will be used as "low memory", that is, memory which the kernel can
566 access directly, without having to set up a kernel virtual mapping.
567 This can be useful in optimizing the layout of kernel virtual
570 Say N here unless you know what you are doing.
573 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
576 config KERNEL_START_BOOL
577 bool "Set custom kernel base address"
578 depends on ADVANCED_OPTIONS
580 This option allows you to set the kernel virtual address at which
581 the kernel will map low memory (the kernel image will be linked at
582 this address). This can be useful in optimizing the virtual memory
583 layout of the system.
585 Say N here unless you know what you are doing.
588 hex "Virtual address of kernel base" if KERNEL_START_BOOL
591 config TASK_SIZE_BOOL
592 bool "Set custom user task size"
593 depends on ADVANCED_OPTIONS
595 This option allows you to set the amount of virtual address space
596 allocated to user tasks. This can be useful in optimizing the
597 virtual memory layout of the system.
599 Say N here unless you know what you are doing.
602 hex "Size of user task space" if TASK_SIZE_BOOL
603 default "0x80000000" if PPC_PREP || PPC_8xx
606 config CONSISTENT_START_BOOL
607 bool "Set custom consistent memory pool address"
608 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
610 This option allows you to set the base virtual address
611 of the consistent memory pool. This pool of virtual
612 memory is used to make consistent memory allocations.
614 config CONSISTENT_START
615 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
616 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
617 default "0xff100000" if NOT_COHERENT_CACHE
619 config CONSISTENT_SIZE_BOOL
620 bool "Set custom consistent memory pool size"
621 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
623 This option allows you to set the size of the
624 consistent memory pool. This pool of virtual memory
625 is used to make consistent memory allocations.
627 config CONSISTENT_SIZE
628 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
629 default "0x00200000" if NOT_COHERENT_CACHE
631 config BOOT_LOAD_BOOL
632 bool "Set the boot link/load address"
633 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
635 This option allows you to set the initial load address of the zImage
636 or zImage.initrd file. This can be useful if you are on a board
637 which has a small amount of memory.
639 Say N here unless you know what you are doing.
642 hex "Link/load address for booting" if BOOT_LOAD_BOOL
643 default "0x00400000" if 40x || 8xx || 8260
644 default "0x01000000" if 44x
648 bool "Pinned Kernel TLBs (860 ONLY)"
649 depends on ADVANCED_OPTIONS && 8xx
655 default "0xc000000000000000"
660 source "drivers/Kconfig"
664 # XXX source "arch/ppc/8xx_io/Kconfig"
666 # XXX source "arch/ppc/8260_io/Kconfig"
668 source "arch/powerpc/sysdev/qe_lib/Kconfig"
672 source "kernel/Kconfig.instrumentation"
674 source "arch/powerpc/Kconfig.debug"
676 source "security/Kconfig"
680 depends on COMPAT && KEYS
683 source "crypto/Kconfig"