2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
16 config RWSEM_GENERIC_SPINLOCK
19 config RWSEM_XCHGADD_ALGORITHM
23 config GENERIC_CALIBRATE_DELAY
27 config GENERIC_ISA_DMA
43 config SCHED_NO_NO_OMIT_FRAME_POINTER
47 # We optimistically allocate largepages from the VM, so make the limit
48 # large enough (16MB). This badly named config option is actually
50 config FORCE_MAX_ZONEORDER
58 depends on COMPAT && SYSVIPC
61 menu "Platform support"
64 prompt "Platform Type"
65 default PPC_MULTIPLATFORM
68 bool "IBM Legacy iSeries"
70 config PPC_MULTIPLATFORM
76 depends on PPC_MULTIPLATFORM
77 bool " IBM pSeries & new iSeries"
81 depends on PPC_MULTIPLATFORM
82 bool " Apple G5 based machines"
87 depends on PPC_MULTIPLATFORM
88 bool " Maple 970FX Evaluation Board"
93 This option enables support for the Maple 970FX Evaluation Board.
94 For more informations, refer to <http://www.970eval.com>
105 depends on PPC_MULTIPLATFORM
109 # VMX is pSeries only for now until somebody writes the iSeries
110 # exception vectors for it
112 bool "Support for VMX (Altivec) vector unit"
113 depends on PPC_MULTIPLATFORM
117 depends on PPC_PSERIES
118 bool "Support for shared-processor logical partitions"
121 Enabling this option will make the kernel run more efficiently
122 on logically-partitioned pSeries systems which use shared
123 processors, that is, which share physical processors between
124 two or more partitions.
127 depends on PPC_PSERIES || PPC_ISERIES
133 depends on PPC_MULTIPLATFORM
136 config MPIC_BROKEN_U3
147 bool "Support for early boot text console"
150 Say Y here to see progress messages from the boot firmware in text
151 mode. Requires an Open Firmware compatible video card.
154 bool "Optimize for POWER4"
157 Cause the compiler to optimize for POWER4 processors. The resulting
158 binary will not work on POWER3 or RS64 processors when compiled with
159 binutils 2.15 or later.
162 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
163 depends on EXPERIMENTAL
166 Cause IO segments sent to a device for DMA to be merged virtually
167 by the IOMMU when they happen to have been allocated contiguously.
168 This doesn't add pressure to the IOMMU allocator. However, some
169 drivers don't support getting large merged segments coming back
170 from *_map_sg(). Say Y if you know the drivers you are using are
171 properly handling this case.
174 bool "Symmetric multi-processing support"
176 This enables support for systems with more than one CPU. If you have
177 a system with only one CPU, say N. If you have a system with more
180 If you say N here, the kernel will run on single and multiprocessor
181 machines, but will use only one CPU of a multiprocessor machine. If
182 you say Y here, the kernel will run on single-processor machines.
183 On a single-processor machine, the kernel will run faster if you say
186 If you don't know what to do here, say Y.
189 int "Maximum number of CPUs (2-128)"
195 bool "Hardware multithreading"
196 depends on SMP && PPC_PSERIES && BROKEN
198 This option enables hardware multithreading on RS64 cpus.
199 pSeries systems p620 and p660 have such a cpu type.
201 config ARCH_SELECT_MEMORY_MODEL
204 config ARCH_FLATMEM_ENABLE
208 config ARCH_DISCONTIGMEM_ENABLE
210 depends on SMP && PPC_PSERIES
212 config ARCH_DISCONTIGMEM_DEFAULT
214 depends on ARCH_DISCONTIGMEM_ENABLE
216 config ARCH_FLATMEM_ENABLE
219 config ARCH_SPARSEMEM_ENABLE
221 depends on ARCH_DISCONTIGMEM_ENABLE
225 config HAVE_ARCH_EARLY_PFN_TO_NID
227 depends on NEED_MULTIPLE_NODES
229 # Some NUMA nodes have memory ranges that span
230 # other nodes. Even though a pfn is valid and
231 # between a node's start and end pfns, it may not
232 # reside on that node.
234 # This is a relatively temporary hack that should
235 # be able to go away when sparsemem is fully in
237 config NODES_SPAN_OTHER_NODES
239 depends on NEED_MULTIPLE_NODES
243 default y if DISCONTIGMEM || SPARSEMEM
246 bool "SMT (Hyperthreading) scheduler support"
250 SMT scheduler support improves the CPU scheduler's decision making
251 when dealing with POWER5 cpus at a cost of slightly increased
252 overhead in some places. If unsure say N here.
255 bool "Preemptible Kernel"
257 This option reduces the latency of the kernel when reacting to
258 real-time or interactive events by allowing a low priority process to
259 be preempted even if it is in kernel mode executing a system call.
261 Say Y here if you are building a kernel for a desktop, embedded
262 or real-time system. Say N if you are unsure.
265 bool "Preempt The Big Kernel Lock"
269 This option reduces the latency of the kernel by making the
270 big kernel lock preemptible.
272 Say Y here if you are building a kernel for a desktop system.
273 Say N if you are unsure.
276 bool "PCI Extended Error Handling (EEH)" if EMBEDDED
277 depends on PPC_PSERIES
278 default y if !EMBEDDED
281 # Use the generic interrupt handling code in kernel/irq/:
283 config GENERIC_HARDIRQS
289 depends on PPC_ISERIES
295 depends on PPC_PSERIES
299 bool "Proc interface to RTAS"
304 tristate "Firmware flash interface"
308 tristate "Scanlog dump interface"
309 depends on RTAS_PROC && PPC_PSERIES
312 tristate "LPAR Configuration Data"
313 depends on PPC_PSERIES || PPC_ISERIES
315 Provide system capacity information via human readable
316 <key word>=<value> pairs through a /proc/ppc64/lparcfg interface.
319 bool "Enable seccomp to safely compute untrusted bytecode"
323 This kernel feature is useful for number crunching applications
324 that may need to compute untrusted bytecode during their
325 execution. By using pipes or other transports made available to
326 the process as file descriptors supporting the read/write
327 syscalls, it's possible to isolate those applications in
328 their own address space using seccomp. Once seccomp is
329 enabled via /proc/<pid>/seccomp, it cannot be disabled
330 and the task is only allowed to execute a few safe syscalls
331 defined by each seccomp mode.
333 If unsure, say Y. Only embedded should say N here.
346 Find out whether you have ISA slots on your motherboard. ISA is the
347 name of a bus system, i.e. the way the CPU talks to the other stuff
348 inside your box. If you have an Apple machine, say N here; if you
349 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
350 you have an embedded board, consult your board documentation.
362 bool "support for PCI devices" if (EMBEDDED && PPC_ISERIES)
365 Find out whether your system includes a PCI bus. PCI is the name of
366 a bus system, i.e. the way the CPU talks to the other stuff inside
367 your box. If you say Y here, the kernel will include drivers and
368 infrastructure code to support PCI bus devices.
374 source "fs/Kconfig.binfmt"
376 source "drivers/pci/Kconfig"
379 bool "Support for hot-pluggable CPUs"
380 depends on SMP && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
383 Say Y here to be able to turn CPUs off and on.
385 Say N if you are unsure.
387 source "drivers/pcmcia/Kconfig"
389 source "drivers/pci/hotplug/Kconfig"
391 config PROC_DEVICETREE
392 bool "Support for Open Firmware device tree in /proc"
393 depends on !PPC_ISERIES
395 This option adds a device-tree directory under /proc which contains
396 an image of the device tree that the kernel copies from Open
397 Firmware. If unsure, say Y here.
400 bool "Default bootloader kernel arguments"
401 depends on !PPC_ISERIES
404 string "Initial kernel command string"
405 depends on CMDLINE_BOOL
406 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
408 On some platforms, there is currently no way for the boot loader to
409 pass arguments to the kernel. For these platforms, you can supply
410 some command-line options at build time by entering them here. In
411 most cases you will need to specify the root device here.
415 source "drivers/Kconfig"
419 menu "iSeries device drivers"
420 depends on PPC_ISERIES
423 tristate "iSeries Virtual Console Support"
426 tristate "iSeries Virtual I/O disk support"
428 If you are running on an iSeries system and you want to use
429 virtual disks created and managed by OS/400, say Y.
432 tristate "iSeries Virtual I/O CD support"
434 If you are running Linux on an IBM iSeries system and you want to
435 read a CD drive owned by OS/400, say Y here.
438 tristate "iSeries Virtual Tape Support"
440 If you are running Linux on an iSeries system and you want Linux
441 to read and/or write a tape drive owned by OS/400, say Y here.
447 depends on VIOCONS || VIODASD || VIOCD || VIOTAPE || VETH
450 source "arch/ppc64/oprofile/Kconfig"
452 source "arch/ppc64/Kconfig.debug"
454 source "security/Kconfig"
458 depends on COMPAT && KEYS
461 source "crypto/Kconfig"