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"
9 config PPC_PM_NEEDS_RTC_LIB
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
78 depends on COMPAT && SYSVIPC
81 # All PPC32s use generic nvram driver through ppc_md
86 config SCHED_NO_NO_OMIT_FRAME_POINTER
90 config ARCH_MAY_HAVE_PC_FDC
92 default !PPC_PSERIES || PCI
101 config GENERIC_TBSYNC
103 default y if PPC32 && SMP
115 config SYS_SUPPORTS_APM_EMULATION
116 default y if PMAC_APM_EMU
119 config DEFAULT_UIMAGE
122 Used to allow a board to specify it wants a uImage built by default
127 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
130 config PPC_DCR_NATIVE
140 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
143 config PPC_OF_PLATFORM_PCI
145 depends on PPC64 # not supported on 32 bits yet
148 source "init/Kconfig"
150 source "arch/powerpc/platforms/Kconfig"
152 menu "Kernel options"
155 bool "High memory support"
158 source kernel/Kconfig.hz
159 source kernel/Kconfig.preempt
160 source "fs/Kconfig.binfmt"
162 # We optimistically allocate largepages from the VM, so make the limit
163 # large enough (16MB). This badly named config option is actually
165 config FORCE_MAX_ZONEORDER
168 default "9" if PPC_64K_PAGES
171 config MATH_EMULATION
172 bool "Math emulation"
173 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
175 Some PowerPC chips designed for embedded applications do not have
176 a floating-point unit and therefore do not implement the
177 floating-point instructions in the PowerPC instruction set. If you
178 say Y here, the kernel will include code to emulate a floating-point
179 unit, which will allow programs that use floating-point
183 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
184 depends on EXPERIMENTAL && PPC64
187 Cause IO segments sent to a device for DMA to be merged virtually
188 by the IOMMU when they happen to have been allocated contiguously.
189 This doesn't add pressure to the IOMMU allocator. However, some
190 drivers don't support getting large merged segments coming back
191 from *_map_sg(). Say Y if you know the drivers you are using are
192 properly handling this case.
195 bool "Support for enabling/disabling CPUs"
196 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
198 Say Y here to be able to disable and re-enable individual
199 CPUs at runtime on SMP machines.
201 Say N if you are unsure.
203 config ARCH_ENABLE_MEMORY_HOTPLUG
207 bool "kexec system call (EXPERIMENTAL)"
208 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
210 kexec is a system call that implements the ability to shutdown your
211 current kernel, and to start another kernel. It is like a reboot
212 but it is independent of the system firmware. And like a reboot
213 you can start any kernel with it, not just Linux.
215 The name comes from the similarity to the exec system call.
217 It is an ongoing process to be certain the hardware in a machine
218 is properly shutdown, so do not be surprised if this code does not
219 initially work for you. It may help to enable device hotplugging
220 support. As of this writing the exact hardware interface is
221 strongly in flux, so no good recommendation can be made.
224 bool "Build a kdump crash kernel (EXPERIMENTAL)"
225 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
227 Build a kernel suitable for use as a kdump capture kernel.
228 The kernel will be linked at a different address than normal, and
229 so can only be used for Kdump.
231 Don't change this unless you know what you are doing.
234 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
235 default y if PPC_PREP
238 bool "Distribute interrupts on all CPUs by default"
239 depends on SMP && !MV64360
241 This option gives the kernel permission to distribute IRQs across
242 multiple CPUs. Saying N here will route all IRQs to the first
243 CPU. Generally saying Y is safe, although some problems have been
244 reported with SMP Power Macintoshes with this option enabled.
249 default y if SMP && PPC_PSERIES
254 depends on NEED_MULTIPLE_NODES
256 config ARCH_SELECT_MEMORY_MODEL
260 config ARCH_FLATMEM_ENABLE
262 depends on (PPC64 && !NUMA) || PPC32
264 config ARCH_SPARSEMEM_ENABLE
268 config ARCH_SPARSEMEM_DEFAULT
270 depends on (SMP && PPC_PSERIES) || PPC_PS3
272 config ARCH_POPULATES_NODE_MAP
277 config ARCH_MEMORY_PROBE
279 depends on MEMORY_HOTPLUG
281 # Some NUMA nodes have memory ranges that span
282 # other nodes. Even though a pfn is valid and
283 # between a node's start and end pfns, it may not
284 # reside on that node. See memmap_init_zone()
286 config NODES_SPAN_OTHER_NODES
288 depends on NEED_MULTIPLE_NODES
290 config PPC_HAS_HASH_64K
298 select PPC_HAS_HASH_64K
300 This option changes the kernel logical page size to 64k. On machines
301 without processor support for 64k pages, the kernel will simulate
302 them by loading each individual 4k page on demand transparently,
303 while on hardware with such support, it will be used to map
304 normal application pages.
307 bool "SMT (Hyperthreading) scheduler support"
308 depends on PPC64 && SMP
310 SMT scheduler support improves the CPU scheduler's decision making
311 when dealing with POWER5 cpus at a cost of slightly increased
312 overhead in some places. If unsure say N here.
314 config PROC_DEVICETREE
315 bool "Support for device tree in /proc"
318 This option adds a device-tree directory under /proc which contains
319 an image of the device tree that the kernel copies from Open
320 Firmware or other boot firmware. If unsure, say Y here.
323 bool "Default bootloader kernel arguments"
326 string "Initial kernel command string"
327 depends on CMDLINE_BOOL
328 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
330 On some platforms, there is currently no way for the boot loader to
331 pass arguments to the kernel. For these platforms, you can supply
332 some command-line options at build time by entering them here. In
333 most cases you will need to specify the root device here.
336 source kernel/power/Kconfig
340 bool "Enable seccomp to safely compute untrusted bytecode"
344 This kernel feature is useful for number crunching applications
345 that may need to compute untrusted bytecode during their
346 execution. By using pipes or other transports made available to
347 the process as file descriptors supporting the read/write
348 syscalls, it's possible to isolate those applications in
349 their own address space using seccomp. Once seccomp is
350 enabled via /proc/<pid>/seccomp, it cannot be disabled
351 and the task is only allowed to execute a few safe syscalls
352 defined by each seccomp mode.
354 If unsure, say Y. Only embedded should say N here.
356 config WANT_DEVICE_TREE
361 string "Static device tree source file"
362 depends on WANT_DEVICE_TREE
364 This specifies the device tree source (.dts) file to be
365 compiled and included when building the bootwrapper. If a
366 relative filename is given, then it will be relative to
367 arch/powerpc/boot/dts. If you are not using the bootwrapper,
368 or do not need to build a dts into the bootwrapper, this
371 For example, this is required when building a cuImage target
372 for an older U-Boot, which cannot pass a device tree itself.
373 Such a kernel will not work with a newer U-Boot that tries to
374 pass a device tree (unless you tell it not to). If your U-Boot
375 does not mention a device tree in "help bootm", then use the
376 cuImage target and specify a device tree here. Otherwise, use
377 the uImage target and leave this field blank.
388 bool "Support for ISA-bus hardware"
389 depends on PPC_PREP || PPC_CHRP
392 Find out whether you have ISA slots on your motherboard. ISA is the
393 name of a bus system, i.e. the way the CPU talks to the other stuff
394 inside your box. If you have an Apple machine, say N here; if you
395 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
396 you have an embedded board, consult your board documentation.
402 config GENERIC_ISA_DMA
404 depends on PPC64 || POWER4 || 6xx && !CPM2
407 config PPC_INDIRECT_PCI
410 default y if 40x || 44x
413 config PPC_INDIRECT_PCI_BE
415 depends PPC_INDIRECT_PCI
431 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
436 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
437 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
438 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
439 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
440 && !PPC_85xx && !PPC_86xx
441 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
442 default PCI_QSPAN if !4xx && !CPM2 && 8xx
443 select ARCH_SUPPORTS_MSI
445 Find out whether your system includes a PCI bus. PCI is the name of
446 a bus system, i.e. the way the CPU talks to the other stuff inside
447 your box. If you say Y here, the kernel will include drivers and
448 infrastructure code to support PCI bus devices.
456 depends on !4xx && !CPM2 && 8xx
459 Say Y here if you have a system based on a Motorola 8xx-series
460 embedded processor with a QSPAN PCI interface, otherwise say N.
464 depends on PCI && 8260
465 select PPC_INDIRECT_PCI
469 bool "Enable workaround for MPC826x erratum PCI 9"
470 depends on PCI_8260 && !ADS8272
474 prompt "IDMA channel for PCI 9 workaround"
477 config 8260_PCI9_IDMA1
480 config 8260_PCI9_IDMA2
483 config 8260_PCI9_IDMA3
486 config 8260_PCI9_IDMA4
491 source "drivers/pci/pcie/Kconfig"
493 source "drivers/pci/Kconfig"
495 source "drivers/pcmcia/Kconfig"
497 source "drivers/pci/hotplug/Kconfig"
501 menu "Advanced setup"
504 config ADVANCED_OPTIONS
505 bool "Prompt for advanced kernel configuration options"
507 This option will enable prompting for a variety of advanced kernel
508 configuration options. These options can cause the kernel to not
509 work if they are set incorrectly, but can be used to optimize certain
510 aspects of kernel memory management.
512 Unless you know what you are doing, say N here.
514 comment "Default settings for advanced configuration options are used"
515 depends on !ADVANCED_OPTIONS
517 config HIGHMEM_START_BOOL
518 bool "Set high memory pool address"
519 depends on ADVANCED_OPTIONS && HIGHMEM
521 This option allows you to set the base address of the kernel virtual
522 area used to map high memory pages. This can be useful in
523 optimizing the layout of kernel virtual memory.
525 Say N here unless you know what you are doing.
528 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
531 config LOWMEM_SIZE_BOOL
532 bool "Set maximum low memory"
533 depends on ADVANCED_OPTIONS
535 This option allows you to set the maximum amount of memory which
536 will be used as "low memory", that is, memory which the kernel can
537 access directly, without having to set up a kernel virtual mapping.
538 This can be useful in optimizing the layout of kernel virtual
541 Say N here unless you know what you are doing.
544 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
547 config KERNEL_START_BOOL
548 bool "Set custom kernel base address"
549 depends on ADVANCED_OPTIONS
551 This option allows you to set the kernel virtual address at which
552 the kernel will map low memory (the kernel image will be linked at
553 this address). This can be useful in optimizing the virtual memory
554 layout of the system.
556 Say N here unless you know what you are doing.
559 hex "Virtual address of kernel base" if KERNEL_START_BOOL
562 config TASK_SIZE_BOOL
563 bool "Set custom user task size"
564 depends on ADVANCED_OPTIONS
566 This option allows you to set the amount of virtual address space
567 allocated to user tasks. This can be useful in optimizing the
568 virtual memory layout of the system.
570 Say N here unless you know what you are doing.
573 hex "Size of user task space" if TASK_SIZE_BOOL
576 config CONSISTENT_START_BOOL
577 bool "Set custom consistent memory pool address"
578 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
580 This option allows you to set the base virtual address
581 of the consistent memory pool. This pool of virtual
582 memory is used to make consistent memory allocations.
584 config CONSISTENT_START
585 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
586 default "0xff100000" if NOT_COHERENT_CACHE
588 config CONSISTENT_SIZE_BOOL
589 bool "Set custom consistent memory pool size"
590 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
592 This option allows you to set the size of the
593 consistent memory pool. This pool of virtual memory
594 is used to make consistent memory allocations.
596 config CONSISTENT_SIZE
597 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
598 default "0x00200000" if NOT_COHERENT_CACHE
600 config BOOT_LOAD_BOOL
601 bool "Set the boot link/load address"
602 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
604 This option allows you to set the initial load address of the zImage
605 or zImage.initrd file. This can be useful if you are on a board
606 which has a small amount of memory.
608 Say N here unless you know what you are doing.
611 hex "Link/load address for booting" if BOOT_LOAD_BOOL
612 default "0x00400000" if 40x || 8xx || 8260
613 default "0x01000000" if 44x
617 bool "Pinned Kernel TLBs (860 ONLY)"
618 depends on ADVANCED_OPTIONS && 8xx
624 default "0xc000000000000000"
629 source "drivers/Kconfig"
633 # XXX source "arch/ppc/8xx_io/Kconfig"
635 # XXX source "arch/ppc/8260_io/Kconfig"
637 source "arch/powerpc/sysdev/qe_lib/Kconfig"
641 menu "Instrumentation Support"
642 depends on EXPERIMENTAL
644 source "arch/powerpc/oprofile/Kconfig"
647 bool "Kprobes (EXPERIMENTAL)"
648 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
650 Kprobes allows you to trap at almost any kernel address and
651 execute a callback function. register_kprobe() establishes
652 a probepoint and specifies the callback. Kprobes is useful
653 for kernel debugging, non-intrusive instrumentation and testing.
654 If in doubt, say "N".
657 source "arch/powerpc/Kconfig.debug"
659 source "security/Kconfig"
663 depends on COMPAT && KEYS
666 source "crypto/Kconfig"