2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
19 config RWSEM_GENERIC_SPINLOCK
22 config RWSEM_XCHGADD_ALGORITHM
26 config GENERIC_CALIBRATE_DELAY
30 config GENERIC_ISA_DMA
42 config SCHED_NO_NO_OMIT_FRAME_POINTER
46 config ARCH_MAY_HAVE_PC_FDC
50 # We optimistically allocate largepages from the VM, so make the limit
51 # large enough (16MB). This badly named config option is actually
53 config FORCE_MAX_ZONEORDER
61 depends on COMPAT && SYSVIPC
64 menu "Platform support"
67 prompt "Platform Type"
68 default PPC_MULTIPLATFORM
71 bool "IBM Legacy iSeries"
73 config PPC_MULTIPLATFORM
79 depends on PPC_MULTIPLATFORM
80 bool " IBM pSeries & new iSeries"
84 bool " Broadband Processor Architecture"
85 depends on PPC_MULTIPLATFORM
88 depends on PPC_MULTIPLATFORM
89 bool " Apple G5 based machines"
95 depends on PPC_MULTIPLATFORM
96 bool " Maple 970FX Evaluation Board"
102 This option enables support for the Maple 970FX Evaluation Board.
103 For more informations, refer to <http://www.970eval.com>
114 depends on PPC_MULTIPLATFORM
119 depends on PPC_PSERIES
124 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
129 depends on PPC_PSERIES
138 # VMX is pSeries only for now until somebody writes the iSeries
139 # exception vectors for it
141 bool "Support for VMX (Altivec) vector unit"
142 depends on PPC_MULTIPLATFORM
146 depends on PPC_PSERIES
147 bool "Support for shared-processor logical partitions"
150 Enabling this option will make the kernel run more efficiently
151 on logically-partitioned pSeries systems which use shared
152 processors, that is, which share physical processors between
153 two or more partitions.
156 bool "kexec system call (EXPERIMENTAL)"
157 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
159 kexec is a system call that implements the ability to shutdown your
160 current kernel, and to start another kernel. It is like a reboot
161 but it is indepedent of the system firmware. And like a reboot
162 you can start any kernel with it, not just Linux.
164 The name comes from the similiarity to the exec system call.
166 It is an ongoing process to be certain the hardware in a machine
167 is properly shutdown, so do not be surprised if this code does not
168 initially work for you. It may help to enable device hotplugging
169 support. As of this writing the exact hardware interface is
170 strongly in flux, so no good recommendation can be made.
173 depends on PPC_PSERIES || PPC_ISERIES
179 depends on PPC_MULTIPLATFORM
182 config MPIC_BROKEN_U3
187 config GENERIC_TBSYNC
196 bool "Support for early boot text console"
199 Say Y here to see progress messages from the boot firmware in text
200 mode. Requires an Open Firmware compatible video card.
209 bool "Optimize for POWER4"
212 Cause the compiler to optimize for POWER4 processors. The resulting
213 binary will not work on POWER3 or RS64 processors when compiled with
214 binutils 2.15 or later.
217 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
218 depends on EXPERIMENTAL
221 Cause IO segments sent to a device for DMA to be merged virtually
222 by the IOMMU when they happen to have been allocated contiguously.
223 This doesn't add pressure to the IOMMU allocator. However, some
224 drivers don't support getting large merged segments coming back
225 from *_map_sg(). Say Y if you know the drivers you are using are
226 properly handling this case.
229 bool "Symmetric multi-processing support"
231 This enables support for systems with more than one CPU. If you have
232 a system with only one CPU, say N. If you have a system with more
235 If you say N here, the kernel will run on single and multiprocessor
236 machines, but will use only one CPU of a multiprocessor machine. If
237 you say Y here, the kernel will run on single-processor machines.
238 On a single-processor machine, the kernel will run faster if you say
241 If you don't know what to do here, say Y.
244 int "Maximum number of CPUs (2-128)"
250 bool "Hardware multithreading"
251 depends on SMP && PPC_PSERIES && BROKEN
253 This option enables hardware multithreading on RS64 cpus.
254 pSeries systems p620 and p660 have such a cpu type.
258 default y if SMP && PPC_PSERIES
260 config ARCH_SELECT_MEMORY_MODEL
263 config ARCH_FLATMEM_ENABLE
267 config ARCH_DISCONTIGMEM_ENABLE
269 depends on SMP && PPC_PSERIES
271 config ARCH_DISCONTIGMEM_DEFAULT
273 depends on ARCH_DISCONTIGMEM_ENABLE
275 config ARCH_SPARSEMEM_ENABLE
277 depends on ARCH_DISCONTIGMEM_ENABLE
281 config HAVE_ARCH_EARLY_PFN_TO_NID
283 depends on NEED_MULTIPLE_NODES
285 # Some NUMA nodes have memory ranges that span
286 # other nodes. Even though a pfn is valid and
287 # between a node's start and end pfns, it may not
288 # reside on that node.
290 # This is a relatively temporary hack that should
291 # be able to go away when sparsemem is fully in
293 config NODES_SPAN_OTHER_NODES
295 depends on NEED_MULTIPLE_NODES
298 bool "SMT (Hyperthreading) scheduler support"
302 SMT scheduler support improves the CPU scheduler's decision making
303 when dealing with POWER5 cpus at a cost of slightly increased
304 overhead in some places. If unsure say N here.
306 source "kernel/Kconfig.preempt"
307 source kernel/Kconfig.hz
310 bool "PCI Extended Error Handling (EEH)" if EMBEDDED
311 depends on PPC_PSERIES
312 default y if !EMBEDDED
315 # Use the generic interrupt handling code in kernel/irq/:
317 config GENERIC_HARDIRQS
323 depends on PPC_PSERIES || PPC_BPA
326 config RTAS_ERROR_LOGGING
332 bool "Proc interface to RTAS"
337 tristate "Firmware flash interface"
341 tristate "Scanlog dump interface"
342 depends on RTAS_PROC && PPC_PSERIES
345 tristate "LPAR Configuration Data"
346 depends on PPC_PSERIES || PPC_ISERIES
348 Provide system capacity information via human readable
349 <key word>=<value> pairs through a /proc/ppc64/lparcfg interface.
352 bool "Enable seccomp to safely compute untrusted bytecode"
356 This kernel feature is useful for number crunching applications
357 that may need to compute untrusted bytecode during their
358 execution. By using pipes or other transports made available to
359 the process as file descriptors supporting the read/write
360 syscalls, it's possible to isolate those applications in
361 their own address space using seccomp. Once seccomp is
362 enabled via /proc/<pid>/seccomp, it cannot be disabled
363 and the task is only allowed to execute a few safe syscalls
364 defined by each seccomp mode.
366 If unsure, say Y. Only embedded should say N here.
368 source "fs/Kconfig.binfmt"
371 bool "Support for hot-pluggable CPUs"
372 depends on SMP && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
375 Say Y here to be able to turn CPUs off and on.
377 Say N if you are unsure.
379 config PROC_DEVICETREE
380 bool "Support for Open Firmware device tree in /proc"
382 This option adds a device-tree directory under /proc which contains
383 an image of the device tree that the kernel copies from Open
384 Firmware. If unsure, say Y here.
387 bool "Default bootloader kernel arguments"
388 depends on !PPC_ISERIES
391 string "Initial kernel command string"
392 depends on CMDLINE_BOOL
393 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
395 On some platforms, there is currently no way for the boot loader to
396 pass arguments to the kernel. For these platforms, you can supply
397 some command-line options at build time by entering them here. In
398 most cases you will need to specify the root device here.
411 Find out whether you have ISA slots on your motherboard. ISA is the
412 name of a bus system, i.e. the way the CPU talks to the other stuff
413 inside your box. If you have an Apple machine, say N here; if you
414 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
415 you have an embedded board, consult your board documentation.
427 bool "support for PCI devices" if (EMBEDDED && PPC_ISERIES)
430 Find out whether your system includes a PCI bus. PCI is the name of
431 a bus system, i.e. the way the CPU talks to the other stuff inside
432 your box. If you say Y here, the kernel will include drivers and
433 infrastructure code to support PCI bus devices.
439 source "drivers/pci/Kconfig"
441 source "drivers/pcmcia/Kconfig"
443 source "drivers/pci/hotplug/Kconfig"
449 source "drivers/Kconfig"
453 menu "iSeries device drivers"
454 depends on PPC_ISERIES
457 tristate "iSeries Virtual Console Support"
460 tristate "iSeries Virtual I/O disk support"
462 If you are running on an iSeries system and you want to use
463 virtual disks created and managed by OS/400, say Y.
466 tristate "iSeries Virtual I/O CD support"
468 If you are running Linux on an IBM iSeries system and you want to
469 read a CD drive owned by OS/400, say Y here.
472 tristate "iSeries Virtual Tape Support"
474 If you are running Linux on an iSeries system and you want Linux
475 to read and/or write a tape drive owned by OS/400, say Y here.
481 depends on VIOCONS || VIODASD || VIOCD || VIOTAPE || VETH
484 source "arch/powerpc/oprofile/Kconfig"
486 source "arch/ppc64/Kconfig.debug"
488 source "security/Kconfig"
492 depends on COMPAT && KEYS
495 source "crypto/Kconfig"