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1# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/kconfig-language.txt.
3#
4
5mainmenu "Linux/PowerPC Kernel Configuration"
6
a0ae9c7c 7source "arch/powerpc/platforms/Kconfig.cputype"
17e638bc 8
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9config PPC32
10 bool
11 default y if !PPC64
12
13config 64BIT
14 bool
15 default y if PPC64
16
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17config WORD_SIZE
18 int
19 default 64 if PPC64
20 default 32 if !PPC64
21
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22config PPC_MERGE
23 def_bool y
24
25config MMU
26 bool
27 default y
28
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29config GENERIC_CMOS_UPDATE
30 def_bool y
31
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32config GENERIC_TIME
33 def_bool y
34
35config GENERIC_TIME_VSYSCALL
36 def_bool y
37
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38config GENERIC_CLOCKEVENTS
39 def_bool y
40
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41config GENERIC_HARDIRQS
42 bool
43 default y
44
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45config IRQ_PER_CPU
46 bool
47 default y
48
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49config RWSEM_GENERIC_SPINLOCK
50 bool
51
52config RWSEM_XCHGADD_ALGORITHM
53 bool
54 default y
55
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56config ARCH_HAS_ILOG2_U32
57 bool
ef55d53c 58 default y
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59
60config ARCH_HAS_ILOG2_U64
61 bool
ef55d53c 62 default y if 64BIT
f0d1b0b3 63
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64config GENERIC_HWEIGHT
65 bool
66 default y
67
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68config GENERIC_CALIBRATE_DELAY
69 bool
70 default y
71
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72config GENERIC_FIND_NEXT_BIT
73 bool
74 default y
75
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76config ARCH_NO_VIRT_TO_BUS
77 def_bool PPC64
78
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79config PPC
80 bool
81 default y
82
83config EARLY_PRINTK
84 bool
51d3082f 85 default y
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86
87config COMPAT
88 bool
89 default y if PPC64
90
91config SYSVIPC_COMPAT
92 bool
93 depends on COMPAT && SYSVIPC
94 default y
95
96# All PPC32s use generic nvram driver through ppc_md
97config GENERIC_NVRAM
98 bool
99 default y if PPC32
100
101config SCHED_NO_NO_OMIT_FRAME_POINTER
102 bool
103 default y
104
105config ARCH_MAY_HAVE_PC_FDC
106 bool
bed59275 107 default !PPC_PSERIES || PCI
14cf11af 108
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109config PPC_OF
110 def_bool y
111
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112config OF
113 def_bool y
114
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115config PPC_UDBG_16550
116 bool
117 default n
118
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119config GENERIC_TBSYNC
120 bool
121 default y if PPC32 && SMP
122 default n
123
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124config AUDIT_ARCH
125 bool
126 default y
127
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128config GENERIC_BUG
129 bool
130 default y
131 depends on BUG
132
b3028878 133config SYS_SUPPORTS_APM_EMULATION
58da10bb 134 default y if PMAC_APM_EMU
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135 bool
136
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137config DEFAULT_UIMAGE
138 bool
139 help
140 Used to allow a board to specify it wants a uImage built by default
141 default n
142
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143config PPC64_SWSUSP
144 bool
145 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
146 default y
147
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148config PPC_DCR_NATIVE
149 bool
150 default n
151
152config PPC_DCR_MMIO
153 bool
154 default n
155
156config PPC_DCR
157 bool
158 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
159 default y
160
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161config PPC_OF_PLATFORM_PCI
162 bool
163 depends on PPC64 # not supported on 32 bits yet
164 default n
165
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166source "init/Kconfig"
167
4330f5da 168source "arch/powerpc/platforms/Kconfig"
14cf11af 169
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170menu "Kernel options"
171
172config HIGHMEM
173 bool "High memory support"
174 depends on PPC32
175
1ad74998 176source kernel/time/Kconfig
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177source kernel/Kconfig.hz
178source kernel/Kconfig.preempt
179source "fs/Kconfig.binfmt"
180
181# We optimistically allocate largepages from the VM, so make the limit
182# large enough (16MB). This badly named config option is actually
183# max order + 1
184config FORCE_MAX_ZONEORDER
185 int
186 depends on PPC64
02864867 187 default "9" if PPC_64K_PAGES
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188 default "13"
189
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190config HUGETLB_PAGE_SIZE_VARIABLE
191 bool
192 depends on HUGETLB_PAGE
193 default y
194
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195config MATH_EMULATION
196 bool "Math emulation"
4d52719a 197 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
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198 ---help---
199 Some PowerPC chips designed for embedded applications do not have
200 a floating-point unit and therefore do not implement the
201 floating-point instructions in the PowerPC instruction set. If you
202 say Y here, the kernel will include code to emulate a floating-point
203 unit, which will allow programs that use floating-point
204 instructions to run.
205
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206config 8XX_MINIMAL_FPEMU
207 bool "Minimal math emulation for 8xx"
208 depends on 8xx && !MATH_EMULATION
209 help
210 Older arch/ppc kernels still emulated a few floating point
211 instructions such as load and store, even when full math
212 emulation is disabled. Say "Y" here if you want to preserve
213 this behavior.
214
215 It is recommended that you build a soft-float userspace instead.
216
14cf11af 217config IOMMU_VMERGE
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218 bool "Enable IOMMU virtual merging"
219 depends on PPC64
220 default y
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221 help
222 Cause IO segments sent to a device for DMA to be merged virtually
223 by the IOMMU when they happen to have been allocated contiguously.
224 This doesn't add pressure to the IOMMU allocator. However, some
225 drivers don't support getting large merged segments coming back
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226 from *_map_sg().
227
228 Most drivers don't have this problem; it is safe to say Y here.
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229
230config HOTPLUG_CPU
231 bool "Support for enabling/disabling CPUs"
232 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
233 ---help---
234 Say Y here to be able to disable and re-enable individual
235 CPUs at runtime on SMP machines.
236
237 Say N if you are unsure.
238
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239config ARCH_ENABLE_MEMORY_HOTPLUG
240 def_bool y
241
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242config KEXEC
243 bool "kexec system call (EXPERIMENTAL)"
fd4ba7e2 244 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
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245 help
246 kexec is a system call that implements the ability to shutdown your
247 current kernel, and to start another kernel. It is like a reboot
1f1332f7 248 but it is independent of the system firmware. And like a reboot
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249 you can start any kernel with it, not just Linux.
250
1f1332f7 251 The name comes from the similarity to the exec system call.
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252
253 It is an ongoing process to be certain the hardware in a machine
254 is properly shutdown, so do not be surprised if this code does not
255 initially work for you. It may help to enable device hotplugging
256 support. As of this writing the exact hardware interface is
257 strongly in flux, so no good recommendation can be made.
258
e8625d46 259config CRASH_DUMP
cd9c99d7 260 bool "Build a kdump crash kernel (EXPERIMENTAL)"
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261 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
262 help
263 Build a kernel suitable for use as a kdump capture kernel.
264 The kernel will be linked at a different address than normal, and
265 so can only be used for Kdump.
266
267 Don't change this unless you know what you are doing.
268
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269config PPCBUG_NVRAM
270 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
271 default y if PPC_PREP
272
273config IRQ_ALL_CPUS
274 bool "Distribute interrupts on all CPUs by default"
275 depends on SMP && !MV64360
276 help
277 This option gives the kernel permission to distribute IRQs across
278 multiple CPUs. Saying N here will route all IRQs to the first
279 CPU. Generally saying Y is safe, although some problems have been
280 reported with SMP Power Macintoshes with this option enabled.
281
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282config NUMA
283 bool "NUMA support"
284 depends on PPC64
285 default y if SMP && PPC_PSERIES
286
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287config NODES_SHIFT
288 int
289 default "4"
290 depends on NEED_MULTIPLE_NODES
291
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292config ARCH_SELECT_MEMORY_MODEL
293 def_bool y
294 depends on PPC64
295
296config ARCH_FLATMEM_ENABLE
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297 def_bool y
298 depends on (PPC64 && !NUMA) || PPC32
14cf11af 299
45fb6cea 300config ARCH_SPARSEMEM_ENABLE
14cf11af 301 def_bool y
9100b205 302 depends on PPC64
d29eff7b 303 select SPARSEMEM_VMEMMAP_ENABLE
14cf11af 304
45fb6cea 305config ARCH_SPARSEMEM_DEFAULT
14cf11af 306 def_bool y
78bde53e 307 depends on (SMP && PPC_PSERIES) || PPC_PS3
14cf11af 308
c67c3cb4 309config ARCH_POPULATES_NODE_MAP
14cf11af 310 def_bool y
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311
312source "mm/Kconfig"
14cf11af 313
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314config ARCH_MEMORY_PROBE
315 def_bool y
316 depends on MEMORY_HOTPLUG
317
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318# Some NUMA nodes have memory ranges that span
319# other nodes. Even though a pfn is valid and
320# between a node's start and end pfns, it may not
321# reside on that node. See memmap_init_zone()
322# for details.
323config NODES_SPAN_OTHER_NODES
324 def_bool y
325 depends on NEED_MULTIPLE_NODES
326
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327config PPC_HAS_HASH_64K
328 bool
329 depends on PPC64
330 default n
331
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332config PPC_64K_PAGES
333 bool "64k page size"
863c84b9 334 depends on PPC64
16c2d476 335 select PPC_HAS_HASH_64K
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336 help
337 This option changes the kernel logical page size to 64k. On machines
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338 without processor support for 64k pages, the kernel will simulate
339 them by loading each individual 4k page on demand transparently,
340 while on hardware with such support, it will be used to map
341 normal application pages.
3c726f8d 342
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343config SCHED_SMT
344 bool "SMT (Hyperthreading) scheduler support"
345 depends on PPC64 && SMP
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346 help
347 SMT scheduler support improves the CPU scheduler's decision making
348 when dealing with POWER5 cpus at a cost of slightly increased
349 overhead in some places. If unsure say N here.
350
351config PROC_DEVICETREE
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352 bool "Support for device tree in /proc"
353 depends on PROC_FS
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354 help
355 This option adds a device-tree directory under /proc which contains
356 an image of the device tree that the kernel copies from Open
5f296755 357 Firmware or other boot firmware. If unsure, say Y here.
14cf11af 358
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359config CMDLINE_BOOL
360 bool "Default bootloader kernel arguments"
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361
362config CMDLINE
363 string "Initial kernel command string"
364 depends on CMDLINE_BOOL
365 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
366 help
367 On some platforms, there is currently no way for the boot loader to
368 pass arguments to the kernel. For these platforms, you can supply
369 some command-line options at build time by entering them here. In
370 most cases you will need to specify the root device here.
371
372if !44x || BROKEN
373source kernel/power/Kconfig
374endif
375
376config SECCOMP
377 bool "Enable seccomp to safely compute untrusted bytecode"
378 depends on PROC_FS
379 default y
380 help
381 This kernel feature is useful for number crunching applications
382 that may need to compute untrusted bytecode during their
383 execution. By using pipes or other transports made available to
384 the process as file descriptors supporting the read/write
385 syscalls, it's possible to isolate those applications in
386 their own address space using seccomp. Once seccomp is
387 enabled via /proc/<pid>/seccomp, it cannot be disabled
388 and the task is only allowed to execute a few safe syscalls
389 defined by each seccomp mode.
390
391 If unsure, say Y. Only embedded should say N here.
392
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393config WANT_DEVICE_TREE
394 bool
395 default n
396
397config DEVICE_TREE
398 string "Static device tree source file"
399 depends on WANT_DEVICE_TREE
400 help
401 This specifies the device tree source (.dts) file to be
402 compiled and included when building the bootwrapper. If a
403 relative filename is given, then it will be relative to
404 arch/powerpc/boot/dts. If you are not using the bootwrapper,
405 or do not need to build a dts into the bootwrapper, this
406 field is ignored.
407
408 For example, this is required when building a cuImage target
409 for an older U-Boot, which cannot pass a device tree itself.
410 Such a kernel will not work with a newer U-Boot that tries to
411 pass a device tree (unless you tell it not to). If your U-Boot
412 does not mention a device tree in "help bootm", then use the
413 cuImage target and specify a device tree here. Otherwise, use
414 the uImage target and leave this field blank.
415
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416endmenu
417
418config ISA_DMA_API
419 bool
420 default y
421
422menu "Bus options"
423
424config ISA
425 bool "Support for ISA-bus hardware"
426 depends on PPC_PREP || PPC_CHRP
f9bd170a 427 select PPC_I8259
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428 help
429 Find out whether you have ISA slots on your motherboard. ISA is the
430 name of a bus system, i.e. the way the CPU talks to the other stuff
431 inside your box. If you have an Apple machine, say N here; if you
432 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
433 you have an embedded board, consult your board documentation.
434
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435config ZONE_DMA
436 bool
437 default y
438
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439config GENERIC_ISA_DMA
440 bool
441 depends on PPC64 || POWER4 || 6xx && !CPM2
442 default y
443
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444config PPC_INDIRECT_PCI
445 bool
446 depends on PCI
63dafe57 447 default y if 40x || 44x
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448 default n
449
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450config EISA
451 bool
452
453config SBUS
454 bool
455
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456config FSL_SOC
457 bool
458
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459config FSL_PCI
460 bool
461 select PPC_INDIRECT_PCI
462
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463# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
464config MCA
465 bool
466
467config PCI
53158620 468 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
bed59275 469 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
d3c7ffab 470 || PPC_PS3
f21f49ea 471 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
53158620 472 && !PPC_85xx && !PPC_86xx
f21f49ea 473 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
14cf11af 474 default PCI_QSPAN if !4xx && !CPM2 && 8xx
df87ef55 475 select ARCH_SUPPORTS_MSI
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476 help
477 Find out whether your system includes a PCI bus. PCI is the name of
478 a bus system, i.e. the way the CPU talks to the other stuff inside
479 your box. If you say Y here, the kernel will include drivers and
480 infrastructure code to support PCI bus devices.
481
482config PCI_DOMAINS
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483 def_bool PCI
484
485config PCI_SYSCALL
486 def_bool PCI
14cf11af 487
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488config PCI_QSPAN
489 bool "QSpan PCI"
490 depends on !4xx && !CPM2 && 8xx
f9bd170a 491 select PPC_I8259
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492 help
493 Say Y here if you have a system based on a Motorola 8xx-series
494 embedded processor with a QSPAN PCI interface, otherwise say N.
495
496config PCI_8260
497 bool
498 depends on PCI && 8260
25635c71 499 select PPC_INDIRECT_PCI
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500 default y
501
502config 8260_PCI9
4a3ecc62 503 bool "Enable workaround for MPC826x erratum PCI 9"
e00c5498 504 depends on PCI_8260 && !8272
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505 default y
506
507choice
4a3ecc62 508 prompt "IDMA channel for PCI 9 workaround"
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509 depends on 8260_PCI9
510
511config 8260_PCI9_IDMA1
512 bool "IDMA1"
513
514config 8260_PCI9_IDMA2
515 bool "IDMA2"
516
517config 8260_PCI9_IDMA3
518 bool "IDMA3"
519
520config 8260_PCI9_IDMA4
521 bool "IDMA4"
522
523endchoice
524
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525source "drivers/pci/pcie/Kconfig"
526
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527source "drivers/pci/Kconfig"
528
529source "drivers/pcmcia/Kconfig"
530
531source "drivers/pci/hotplug/Kconfig"
532
533endmenu
534
535menu "Advanced setup"
536 depends on PPC32
537
538config ADVANCED_OPTIONS
539 bool "Prompt for advanced kernel configuration options"
540 help
541 This option will enable prompting for a variety of advanced kernel
542 configuration options. These options can cause the kernel to not
543 work if they are set incorrectly, but can be used to optimize certain
544 aspects of kernel memory management.
545
546 Unless you know what you are doing, say N here.
547
548comment "Default settings for advanced configuration options are used"
549 depends on !ADVANCED_OPTIONS
550
551config HIGHMEM_START_BOOL
552 bool "Set high memory pool address"
553 depends on ADVANCED_OPTIONS && HIGHMEM
554 help
555 This option allows you to set the base address of the kernel virtual
556 area used to map high memory pages. This can be useful in
557 optimizing the layout of kernel virtual memory.
558
559 Say N here unless you know what you are doing.
560
561config HIGHMEM_START
562 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
563 default "0xfe000000"
564
565config LOWMEM_SIZE_BOOL
566 bool "Set maximum low memory"
567 depends on ADVANCED_OPTIONS
568 help
569 This option allows you to set the maximum amount of memory which
570 will be used as "low memory", that is, memory which the kernel can
571 access directly, without having to set up a kernel virtual mapping.
572 This can be useful in optimizing the layout of kernel virtual
573 memory.
574
575 Say N here unless you know what you are doing.
576
577config LOWMEM_SIZE
578 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
579 default "0x30000000"
580
581config KERNEL_START_BOOL
582 bool "Set custom kernel base address"
583 depends on ADVANCED_OPTIONS
584 help
585 This option allows you to set the kernel virtual address at which
586 the kernel will map low memory (the kernel image will be linked at
587 this address). This can be useful in optimizing the virtual memory
588 layout of the system.
589
590 Say N here unless you know what you are doing.
591
592config KERNEL_START
593 hex "Virtual address of kernel base" if KERNEL_START_BOOL
594 default "0xc0000000"
595
596config TASK_SIZE_BOOL
597 bool "Set custom user task size"
598 depends on ADVANCED_OPTIONS
599 help
600 This option allows you to set the amount of virtual address space
601 allocated to user tasks. This can be useful in optimizing the
602 virtual memory layout of the system.
603
604 Say N here unless you know what you are doing.
605
606config TASK_SIZE
607 hex "Size of user task space" if TASK_SIZE_BOOL
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608 default "0x80000000" if PPC_PREP || PPC_8xx
609 default "0xc0000000"
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610
611config CONSISTENT_START_BOOL
612 bool "Set custom consistent memory pool address"
613 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
614 help
615 This option allows you to set the base virtual address
4b3f686d 616 of the consistent memory pool. This pool of virtual
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617 memory is used to make consistent memory allocations.
618
619config CONSISTENT_START
620 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
ccf0d68e 621 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
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622 default "0xff100000" if NOT_COHERENT_CACHE
623
624config CONSISTENT_SIZE_BOOL
625 bool "Set custom consistent memory pool size"
626 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
627 help
4b3f686d 628 This option allows you to set the size of the
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629 consistent memory pool. This pool of virtual memory
630 is used to make consistent memory allocations.
631
632config CONSISTENT_SIZE
633 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
634 default "0x00200000" if NOT_COHERENT_CACHE
635
636config BOOT_LOAD_BOOL
637 bool "Set the boot link/load address"
638 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
639 help
640 This option allows you to set the initial load address of the zImage
641 or zImage.initrd file. This can be useful if you are on a board
642 which has a small amount of memory.
643
644 Say N here unless you know what you are doing.
645
646config BOOT_LOAD
647 hex "Link/load address for booting" if BOOT_LOAD_BOOL
648 default "0x00400000" if 40x || 8xx || 8260
649 default "0x01000000" if 44x
650 default "0x00800000"
651
652config PIN_TLB
653 bool "Pinned Kernel TLBs (860 ONLY)"
654 depends on ADVANCED_OPTIONS && 8xx
655endmenu
656
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657if PPC64
658config KERNEL_START
659 hex
eeb2d218 660 default "0xc000000000000000"
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661endif
662
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663source "net/Kconfig"
664
665source "drivers/Kconfig"
666
667source "fs/Kconfig"
668
669# XXX source "arch/ppc/8xx_io/Kconfig"
670
671# XXX source "arch/ppc/8260_io/Kconfig"
672
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673source "arch/powerpc/sysdev/qe_lib/Kconfig"
674
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675source "lib/Kconfig"
676
09cadedb 677source "kernel/Kconfig.instrumentation"
cd6b0762 678
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679source "arch/powerpc/Kconfig.debug"
680
681source "security/Kconfig"
682
683config KEYS_COMPAT
684 bool
685 depends on COMPAT && KEYS
686 default y
687
688source "crypto/Kconfig"
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689
690config PPC_CLOCK
691 bool
692 default n
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693
694config PPC_LIB_RHEAP
695 bool
696