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_DISCONTIGMEM_ENABLE
203 depends on SMP && PPC_PSERIES
205 config ARCH_DISCONTIGMEM_DEFAULT
207 depends on ARCH_DISCONTIGMEM_ENABLE
209 config ARCH_FLATMEM_ENABLE
216 depends on DISCONTIGMEM
219 bool "SMT (Hyperthreading) scheduler support"
223 SMT scheduler support improves the CPU scheduler's decision making
224 when dealing with POWER5 cpus at a cost of slightly increased
225 overhead in some places. If unsure say N here.
228 bool "Preemptible Kernel"
230 This option reduces the latency of the kernel when reacting to
231 real-time or interactive events by allowing a low priority process to
232 be preempted even if it is in kernel mode executing a system call.
234 Say Y here if you are building a kernel for a desktop, embedded
235 or real-time system. Say N if you are unsure.
238 bool "Preempt The Big Kernel Lock"
242 This option reduces the latency of the kernel by making the
243 big kernel lock preemptible.
245 Say Y here if you are building a kernel for a desktop system.
246 Say N if you are unsure.
249 bool "PCI Extended Error Handling (EEH)" if EMBEDDED
250 depends on PPC_PSERIES
251 default y if !EMBEDDED
254 # Use the generic interrupt handling code in kernel/irq/:
256 config GENERIC_HARDIRQS
262 depends on PPC_ISERIES
268 depends on PPC_PSERIES
272 bool "Proc interface to RTAS"
277 tristate "Firmware flash interface"
281 tristate "Scanlog dump interface"
282 depends on RTAS_PROC && PPC_PSERIES
285 tristate "LPAR Configuration Data"
286 depends on PPC_PSERIES || PPC_ISERIES
288 Provide system capacity information via human readable
289 <key word>=<value> pairs through a /proc/ppc64/lparcfg interface.
292 bool "Enable seccomp to safely compute untrusted bytecode"
296 This kernel feature is useful for number crunching applications
297 that may need to compute untrusted bytecode during their
298 execution. By using pipes or other transports made available to
299 the process as file descriptors supporting the read/write
300 syscalls, it's possible to isolate those applications in
301 their own address space using seccomp. Once seccomp is
302 enabled via /proc/<pid>/seccomp, it cannot be disabled
303 and the task is only allowed to execute a few safe syscalls
304 defined by each seccomp mode.
306 If unsure, say Y. Only embedded should say N here.
319 Find out whether you have ISA slots on your motherboard. ISA is the
320 name of a bus system, i.e. the way the CPU talks to the other stuff
321 inside your box. If you have an Apple machine, say N here; if you
322 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
323 you have an embedded board, consult your board documentation.
335 bool "support for PCI devices" if (EMBEDDED && PPC_ISERIES)
338 Find out whether your system includes a PCI bus. PCI is the name of
339 a bus system, i.e. the way the CPU talks to the other stuff inside
340 your box. If you say Y here, the kernel will include drivers and
341 infrastructure code to support PCI bus devices.
347 source "fs/Kconfig.binfmt"
349 source "drivers/pci/Kconfig"
352 bool "Support for hot-pluggable CPUs"
353 depends on SMP && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
356 Say Y here to be able to turn CPUs off and on.
358 Say N if you are unsure.
360 source "drivers/pcmcia/Kconfig"
362 source "drivers/pci/hotplug/Kconfig"
364 config PROC_DEVICETREE
365 bool "Support for Open Firmware device tree in /proc"
366 depends on !PPC_ISERIES
368 This option adds a device-tree directory under /proc which contains
369 an image of the device tree that the kernel copies from Open
370 Firmware. If unsure, say Y here.
373 bool "Default bootloader kernel arguments"
374 depends on !PPC_ISERIES
377 string "Initial kernel command string"
378 depends on CMDLINE_BOOL
379 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
381 On some platforms, there is currently no way for the boot loader to
382 pass arguments to the kernel. For these platforms, you can supply
383 some command-line options at build time by entering them here. In
384 most cases you will need to specify the root device here.
388 source "drivers/Kconfig"
392 menu "iSeries device drivers"
393 depends on PPC_ISERIES
396 tristate "iSeries Virtual Console Support"
399 tristate "iSeries Virtual I/O disk support"
401 If you are running on an iSeries system and you want to use
402 virtual disks created and managed by OS/400, say Y.
405 tristate "iSeries Virtual I/O CD support"
407 If you are running Linux on an IBM iSeries system and you want to
408 read a CD drive owned by OS/400, say Y here.
411 tristate "iSeries Virtual Tape Support"
413 If you are running Linux on an iSeries system and you want Linux
414 to read and/or write a tape drive owned by OS/400, say Y here.
420 depends on VIOCONS || VIODASD || VIOCD || VIOTAPE || VETH
423 source "arch/ppc64/oprofile/Kconfig"
425 source "arch/ppc64/Kconfig.debug"
427 source "security/Kconfig"
431 depends on COMPAT && KEYS
434 source "crypto/Kconfig"