Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / arch / arm / Kconfig
1 config ARM
2 bool
3 default y
4 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
5 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
6 select ARCH_HAVE_CUSTOM_GPIO_H
7 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
8 select ARCH_WANT_IPC_PARSE_VERSION
9 select BUILDTIME_EXTABLE_SORT if MMU
10 select CPU_PM if (SUSPEND || CPU_IDLE)
11 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
12 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
13 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
14 select GENERIC_IRQ_PROBE
15 select GENERIC_IRQ_SHOW
16 select GENERIC_PCI_IOMAP
17 select GENERIC_SMP_IDLE_THREAD
18 select GENERIC_IDLE_POLL_SETUP
19 select GENERIC_STRNCPY_FROM_USER
20 select GENERIC_STRNLEN_USER
21 select HARDIRQS_SW_RESEND
22 select HAVE_AOUT
23 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
24 select HAVE_ARCH_KGDB
25 select HAVE_ARCH_SECCOMP_FILTER
26 select HAVE_ARCH_TRACEHOOK
27 select HAVE_BPF_JIT
28 select HAVE_C_RECORDMCOUNT
29 select HAVE_DEBUG_KMEMLEAK
30 select HAVE_DMA_API_DEBUG
31 select HAVE_DMA_ATTRS
32 select HAVE_DMA_CONTIGUOUS if MMU
33 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
34 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
35 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
36 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
37 select HAVE_GENERIC_DMA_COHERENT
38 select HAVE_GENERIC_HARDIRQS
39 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
40 select HAVE_IDE if PCI || ISA || PCMCIA
41 select HAVE_IRQ_TIME_ACCOUNTING
42 select HAVE_KERNEL_GZIP
43 select HAVE_KERNEL_LZMA
44 select HAVE_KERNEL_LZO
45 select HAVE_KERNEL_XZ
46 select HAVE_KPROBES if !XIP_KERNEL
47 select HAVE_KRETPROBES if (HAVE_KPROBES)
48 select HAVE_MEMBLOCK
49 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
50 select HAVE_PERF_EVENTS
51 select HAVE_REGS_AND_STACK_ACCESS_API
52 select HAVE_SYSCALL_TRACEPOINTS
53 select HAVE_UID16
54 select KTIME_SCALAR
55 select PERF_USE_VMALLOC
56 select RTC_LIB
57 select SYS_SUPPORTS_APM_EMULATION
58 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
59 select MODULES_USE_ELF_REL
60 select CLONE_BACKWARDS
61 select OLD_SIGSUSPEND3
62 select OLD_SIGACTION
63 select HAVE_CONTEXT_TRACKING
64 help
65 The ARM series is a line of low-power-consumption RISC chip designs
66 licensed by ARM Ltd and targeted at embedded applications and
67 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
68 manufactured, but legacy ARM-based PC hardware remains popular in
69 Europe. There is an ARM Linux project with a web page at
70 <http://www.arm.linux.org.uk/>.
71
72 config ARM_HAS_SG_CHAIN
73 bool
74
75 config NEED_SG_DMA_LENGTH
76 bool
77
78 config ARM_DMA_USE_IOMMU
79 bool
80 select ARM_HAS_SG_CHAIN
81 select NEED_SG_DMA_LENGTH
82
83 if ARM_DMA_USE_IOMMU
84
85 config ARM_DMA_IOMMU_ALIGNMENT
86 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
87 range 4 9
88 default 8
89 help
90 DMA mapping framework by default aligns all buffers to the smallest
91 PAGE_SIZE order which is greater than or equal to the requested buffer
92 size. This works well for buffers up to a few hundreds kilobytes, but
93 for larger buffers it just a waste of address space. Drivers which has
94 relatively small addressing window (like 64Mib) might run out of
95 virtual space with just a few allocations.
96
97 With this parameter you can specify the maximum PAGE_SIZE order for
98 DMA IOMMU buffers. Larger buffers will be aligned only to this
99 specified order. The order is expressed as a power of two multiplied
100 by the PAGE_SIZE.
101
102 endif
103
104 config HAVE_PWM
105 bool
106
107 config MIGHT_HAVE_PCI
108 bool
109
110 config SYS_SUPPORTS_APM_EMULATION
111 bool
112
113 config HAVE_TCM
114 bool
115 select GENERIC_ALLOCATOR
116
117 config HAVE_PROC_CPU
118 bool
119
120 config NO_IOPORT
121 bool
122
123 config EISA
124 bool
125 ---help---
126 The Extended Industry Standard Architecture (EISA) bus was
127 developed as an open alternative to the IBM MicroChannel bus.
128
129 The EISA bus provided some of the features of the IBM MicroChannel
130 bus while maintaining backward compatibility with cards made for
131 the older ISA bus. The EISA bus saw limited use between 1988 and
132 1995 when it was made obsolete by the PCI bus.
133
134 Say Y here if you are building a kernel for an EISA-based machine.
135
136 Otherwise, say N.
137
138 config SBUS
139 bool
140
141 config STACKTRACE_SUPPORT
142 bool
143 default y
144
145 config HAVE_LATENCYTOP_SUPPORT
146 bool
147 depends on !SMP
148 default y
149
150 config LOCKDEP_SUPPORT
151 bool
152 default y
153
154 config TRACE_IRQFLAGS_SUPPORT
155 bool
156 default y
157
158 config RWSEM_GENERIC_SPINLOCK
159 bool
160 default y
161
162 config RWSEM_XCHGADD_ALGORITHM
163 bool
164
165 config ARCH_HAS_ILOG2_U32
166 bool
167
168 config ARCH_HAS_ILOG2_U64
169 bool
170
171 config ARCH_HAS_CPUFREQ
172 bool
173 help
174 Internal node to signify that the ARCH has CPUFREQ support
175 and that the relevant menu configurations are displayed for
176 it.
177
178 config GENERIC_HWEIGHT
179 bool
180 default y
181
182 config GENERIC_CALIBRATE_DELAY
183 bool
184 default y
185
186 config ARCH_MAY_HAVE_PC_FDC
187 bool
188
189 config ZONE_DMA
190 bool
191
192 config NEED_DMA_MAP_STATE
193 def_bool y
194
195 config ARCH_HAS_DMA_SET_COHERENT_MASK
196 bool
197
198 config GENERIC_ISA_DMA
199 bool
200
201 config FIQ
202 bool
203
204 config NEED_RET_TO_USER
205 bool
206
207 config ARCH_MTD_XIP
208 bool
209
210 config VECTORS_BASE
211 hex
212 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
213 default DRAM_BASE if REMAP_VECTORS_TO_RAM
214 default 0x00000000
215 help
216 The base address of exception vectors.
217
218 config ARM_PATCH_PHYS_VIRT
219 bool "Patch physical to virtual translations at runtime" if EMBEDDED
220 default y
221 depends on !XIP_KERNEL && MMU
222 depends on !ARCH_REALVIEW || !SPARSEMEM
223 help
224 Patch phys-to-virt and virt-to-phys translation functions at
225 boot and module load time according to the position of the
226 kernel in system memory.
227
228 This can only be used with non-XIP MMU kernels where the base
229 of physical memory is at a 16MB boundary.
230
231 Only disable this option if you know that you do not require
232 this feature (eg, building a kernel for a single machine) and
233 you need to shrink the kernel to the minimal size.
234
235 config NEED_MACH_GPIO_H
236 bool
237 help
238 Select this when mach/gpio.h is required to provide special
239 definitions for this platform. The need for mach/gpio.h should
240 be avoided when possible.
241
242 config NEED_MACH_IO_H
243 bool
244 help
245 Select this when mach/io.h is required to provide special
246 definitions for this platform. The need for mach/io.h should
247 be avoided when possible.
248
249 config NEED_MACH_MEMORY_H
250 bool
251 help
252 Select this when mach/memory.h is required to provide special
253 definitions for this platform. The need for mach/memory.h should
254 be avoided when possible.
255
256 config PHYS_OFFSET
257 hex "Physical address of main memory" if MMU
258 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
259 default DRAM_BASE if !MMU
260 help
261 Please provide the physical address corresponding to the
262 location of main memory in your system.
263
264 config GENERIC_BUG
265 def_bool y
266 depends on BUG
267
268 source "init/Kconfig"
269
270 source "kernel/Kconfig.freezer"
271
272 menu "System Type"
273
274 config MMU
275 bool "MMU-based Paged Memory Management Support"
276 default y
277 help
278 Select if you want MMU-based virtualised addressing space
279 support by paged memory management. If unsure, say 'Y'.
280
281 #
282 # The "ARM system type" choice list is ordered alphabetically by option
283 # text. Please add new entries in the option alphabetic order.
284 #
285 choice
286 prompt "ARM system type"
287 default ARCH_VERSATILE if !MMU
288 default ARCH_MULTIPLATFORM if MMU
289
290 config ARCH_MULTIPLATFORM
291 bool "Allow multiple platforms to be selected"
292 depends on MMU
293 select ARM_PATCH_PHYS_VIRT
294 select AUTO_ZRELADDR
295 select COMMON_CLK
296 select MULTI_IRQ_HANDLER
297 select SPARSE_IRQ
298 select USE_OF
299
300 config ARCH_INTEGRATOR
301 bool "ARM Ltd. Integrator family"
302 select ARCH_HAS_CPUFREQ
303 select ARM_AMBA
304 select COMMON_CLK
305 select COMMON_CLK_VERSATILE
306 select GENERIC_CLOCKEVENTS
307 select HAVE_TCM
308 select ICST
309 select MULTI_IRQ_HANDLER
310 select NEED_MACH_MEMORY_H
311 select PLAT_VERSATILE
312 select SPARSE_IRQ
313 select VERSATILE_FPGA_IRQ
314 help
315 Support for ARM's Integrator platform.
316
317 config ARCH_REALVIEW
318 bool "ARM Ltd. RealView family"
319 select ARCH_WANT_OPTIONAL_GPIOLIB
320 select ARM_AMBA
321 select ARM_TIMER_SP804
322 select COMMON_CLK
323 select COMMON_CLK_VERSATILE
324 select GENERIC_CLOCKEVENTS
325 select GPIO_PL061 if GPIOLIB
326 select ICST
327 select NEED_MACH_MEMORY_H
328 select PLAT_VERSATILE
329 select PLAT_VERSATILE_CLCD
330 help
331 This enables support for ARM Ltd RealView boards.
332
333 config ARCH_VERSATILE
334 bool "ARM Ltd. Versatile family"
335 select ARCH_WANT_OPTIONAL_GPIOLIB
336 select ARM_AMBA
337 select ARM_TIMER_SP804
338 select ARM_VIC
339 select CLKDEV_LOOKUP
340 select GENERIC_CLOCKEVENTS
341 select HAVE_MACH_CLKDEV
342 select ICST
343 select PLAT_VERSATILE
344 select PLAT_VERSATILE_CLCD
345 select PLAT_VERSATILE_CLOCK
346 select VERSATILE_FPGA_IRQ
347 help
348 This enables support for ARM Ltd Versatile board.
349
350 config ARCH_AT91
351 bool "Atmel AT91"
352 select ARCH_REQUIRE_GPIOLIB
353 select CLKDEV_LOOKUP
354 select HAVE_CLK
355 select IRQ_DOMAIN
356 select NEED_MACH_GPIO_H
357 select NEED_MACH_IO_H if PCCARD
358 select PINCTRL
359 select PINCTRL_AT91 if USE_OF
360 help
361 This enables support for systems based on Atmel
362 AT91RM9200 and AT91SAM9* processors.
363
364 config ARCH_CLPS711X
365 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
366 select ARCH_REQUIRE_GPIOLIB
367 select AUTO_ZRELADDR
368 select CLKDEV_LOOKUP
369 select CLKSRC_MMIO
370 select COMMON_CLK
371 select CPU_ARM720T
372 select GENERIC_CLOCKEVENTS
373 select MFD_SYSCON
374 select MULTI_IRQ_HANDLER
375 select SPARSE_IRQ
376 help
377 Support for Cirrus Logic 711x/721x/731x based boards.
378
379 config ARCH_GEMINI
380 bool "Cortina Systems Gemini"
381 select ARCH_REQUIRE_GPIOLIB
382 select ARCH_USES_GETTIMEOFFSET
383 select NEED_MACH_GPIO_H
384 select CPU_FA526
385 help
386 Support for the Cortina Systems Gemini family SoCs
387
388 config ARCH_EBSA110
389 bool "EBSA-110"
390 select ARCH_USES_GETTIMEOFFSET
391 select CPU_SA110
392 select ISA
393 select NEED_MACH_IO_H
394 select NEED_MACH_MEMORY_H
395 select NO_IOPORT
396 help
397 This is an evaluation board for the StrongARM processor available
398 from Digital. It has limited hardware on-board, including an
399 Ethernet interface, two PCMCIA sockets, two serial ports and a
400 parallel port.
401
402 config ARCH_EP93XX
403 bool "EP93xx-based"
404 select ARCH_HAS_HOLES_MEMORYMODEL
405 select ARCH_REQUIRE_GPIOLIB
406 select ARCH_USES_GETTIMEOFFSET
407 select ARM_AMBA
408 select ARM_VIC
409 select CLKDEV_LOOKUP
410 select CPU_ARM920T
411 select NEED_MACH_MEMORY_H
412 help
413 This enables support for the Cirrus EP93xx series of CPUs.
414
415 config ARCH_FOOTBRIDGE
416 bool "FootBridge"
417 select CPU_SA110
418 select FOOTBRIDGE
419 select GENERIC_CLOCKEVENTS
420 select HAVE_IDE
421 select NEED_MACH_IO_H if !MMU
422 select NEED_MACH_MEMORY_H
423 help
424 Support for systems based on the DC21285 companion chip
425 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
426
427 config ARCH_NETX
428 bool "Hilscher NetX based"
429 select ARM_VIC
430 select CLKSRC_MMIO
431 select CPU_ARM926T
432 select GENERIC_CLOCKEVENTS
433 help
434 This enables support for systems based on the Hilscher NetX Soc
435
436 config ARCH_IOP13XX
437 bool "IOP13xx-based"
438 depends on MMU
439 select ARCH_SUPPORTS_MSI
440 select CPU_XSC3
441 select NEED_MACH_MEMORY_H
442 select NEED_RET_TO_USER
443 select PCI
444 select PLAT_IOP
445 select VMSPLIT_1G
446 help
447 Support for Intel's IOP13XX (XScale) family of processors.
448
449 config ARCH_IOP32X
450 bool "IOP32x-based"
451 depends on MMU
452 select ARCH_REQUIRE_GPIOLIB
453 select CPU_XSCALE
454 select NEED_MACH_GPIO_H
455 select NEED_RET_TO_USER
456 select PCI
457 select PLAT_IOP
458 help
459 Support for Intel's 80219 and IOP32X (XScale) family of
460 processors.
461
462 config ARCH_IOP33X
463 bool "IOP33x-based"
464 depends on MMU
465 select ARCH_REQUIRE_GPIOLIB
466 select CPU_XSCALE
467 select NEED_MACH_GPIO_H
468 select NEED_RET_TO_USER
469 select PCI
470 select PLAT_IOP
471 help
472 Support for Intel's IOP33X (XScale) family of processors.
473
474 config ARCH_IXP4XX
475 bool "IXP4xx-based"
476 depends on MMU
477 select ARCH_HAS_DMA_SET_COHERENT_MASK
478 select ARCH_REQUIRE_GPIOLIB
479 select CLKSRC_MMIO
480 select CPU_XSCALE
481 select DMABOUNCE if PCI
482 select GENERIC_CLOCKEVENTS
483 select MIGHT_HAVE_PCI
484 select NEED_MACH_IO_H
485 select USB_EHCI_BIG_ENDIAN_MMIO
486 select USB_EHCI_BIG_ENDIAN_DESC
487 help
488 Support for Intel's IXP4XX (XScale) family of processors.
489
490 config ARCH_DOVE
491 bool "Marvell Dove"
492 select ARCH_REQUIRE_GPIOLIB
493 select CPU_PJ4
494 select GENERIC_CLOCKEVENTS
495 select MIGHT_HAVE_PCI
496 select PINCTRL
497 select PINCTRL_DOVE
498 select PLAT_ORION_LEGACY
499 select USB_ARCH_HAS_EHCI
500 select MVEBU_MBUS
501 help
502 Support for the Marvell Dove SoC 88AP510
503
504 config ARCH_KIRKWOOD
505 bool "Marvell Kirkwood"
506 select ARCH_HAS_CPUFREQ
507 select ARCH_REQUIRE_GPIOLIB
508 select CPU_FEROCEON
509 select GENERIC_CLOCKEVENTS
510 select PCI
511 select PCI_QUIRKS
512 select PINCTRL
513 select PINCTRL_KIRKWOOD
514 select PLAT_ORION_LEGACY
515 select MVEBU_MBUS
516 help
517 Support for the following Marvell Kirkwood series SoCs:
518 88F6180, 88F6192 and 88F6281.
519
520 config ARCH_MV78XX0
521 bool "Marvell MV78xx0"
522 select ARCH_REQUIRE_GPIOLIB
523 select CPU_FEROCEON
524 select GENERIC_CLOCKEVENTS
525 select PCI
526 select PLAT_ORION_LEGACY
527 select MVEBU_MBUS
528 help
529 Support for the following Marvell MV78xx0 series SoCs:
530 MV781x0, MV782x0.
531
532 config ARCH_ORION5X
533 bool "Marvell Orion"
534 depends on MMU
535 select ARCH_REQUIRE_GPIOLIB
536 select CPU_FEROCEON
537 select GENERIC_CLOCKEVENTS
538 select PCI
539 select PLAT_ORION_LEGACY
540 select MVEBU_MBUS
541 help
542 Support for the following Marvell Orion 5x series SoCs:
543 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
544 Orion-2 (5281), Orion-1-90 (6183).
545
546 config ARCH_MMP
547 bool "Marvell PXA168/910/MMP2"
548 depends on MMU
549 select ARCH_REQUIRE_GPIOLIB
550 select CLKDEV_LOOKUP
551 select GENERIC_ALLOCATOR
552 select GENERIC_CLOCKEVENTS
553 select GPIO_PXA
554 select IRQ_DOMAIN
555 select NEED_MACH_GPIO_H
556 select PINCTRL
557 select PLAT_PXA
558 select SPARSE_IRQ
559 help
560 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
561
562 config ARCH_KS8695
563 bool "Micrel/Kendin KS8695"
564 select ARCH_REQUIRE_GPIOLIB
565 select CLKSRC_MMIO
566 select CPU_ARM922T
567 select GENERIC_CLOCKEVENTS
568 select NEED_MACH_MEMORY_H
569 help
570 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
571 System-on-Chip devices.
572
573 config ARCH_W90X900
574 bool "Nuvoton W90X900 CPU"
575 select ARCH_REQUIRE_GPIOLIB
576 select CLKDEV_LOOKUP
577 select CLKSRC_MMIO
578 select CPU_ARM926T
579 select GENERIC_CLOCKEVENTS
580 help
581 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
582 At present, the w90x900 has been renamed nuc900, regarding
583 the ARM series product line, you can login the following
584 link address to know more.
585
586 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
587 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
588
589 config ARCH_LPC32XX
590 bool "NXP LPC32XX"
591 select ARCH_REQUIRE_GPIOLIB
592 select ARM_AMBA
593 select CLKDEV_LOOKUP
594 select CLKSRC_MMIO
595 select CPU_ARM926T
596 select GENERIC_CLOCKEVENTS
597 select HAVE_IDE
598 select HAVE_PWM
599 select USB_ARCH_HAS_OHCI
600 select USE_OF
601 help
602 Support for the NXP LPC32XX family of processors
603
604 config ARCH_PXA
605 bool "PXA2xx/PXA3xx-based"
606 depends on MMU
607 select ARCH_HAS_CPUFREQ
608 select ARCH_MTD_XIP
609 select ARCH_REQUIRE_GPIOLIB
610 select ARM_CPU_SUSPEND if PM
611 select AUTO_ZRELADDR
612 select CLKDEV_LOOKUP
613 select CLKSRC_MMIO
614 select GENERIC_CLOCKEVENTS
615 select GPIO_PXA
616 select HAVE_IDE
617 select MULTI_IRQ_HANDLER
618 select NEED_MACH_GPIO_H
619 select PLAT_PXA
620 select SPARSE_IRQ
621 help
622 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
623
624 config ARCH_MSM
625 bool "Qualcomm MSM"
626 select ARCH_REQUIRE_GPIOLIB
627 select CLKDEV_LOOKUP
628 select COMMON_CLK
629 select GENERIC_CLOCKEVENTS
630 help
631 Support for Qualcomm MSM/QSD based systems. This runs on the
632 apps processor of the MSM/QSD and depends on a shared memory
633 interface to the modem processor which runs the baseband
634 stack and controls some vital subsystems
635 (clock and power control, etc).
636
637 config ARCH_SHMOBILE
638 bool "Renesas SH-Mobile / R-Mobile"
639 select ARM_PATCH_PHYS_VIRT
640 select CLKDEV_LOOKUP
641 select GENERIC_CLOCKEVENTS
642 select HAVE_ARM_SCU if SMP
643 select HAVE_ARM_TWD if LOCAL_TIMERS
644 select HAVE_CLK
645 select HAVE_MACH_CLKDEV
646 select HAVE_SMP
647 select MIGHT_HAVE_CACHE_L2X0
648 select MULTI_IRQ_HANDLER
649 select NO_IOPORT
650 select PINCTRL
651 select PM_GENERIC_DOMAINS if PM
652 select SPARSE_IRQ
653 help
654 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
655
656 config ARCH_RPC
657 bool "RiscPC"
658 select ARCH_ACORN
659 select ARCH_MAY_HAVE_PC_FDC
660 select ARCH_SPARSEMEM_ENABLE
661 select ARCH_USES_GETTIMEOFFSET
662 select FIQ
663 select HAVE_IDE
664 select HAVE_PATA_PLATFORM
665 select ISA_DMA_API
666 select NEED_MACH_IO_H
667 select NEED_MACH_MEMORY_H
668 select NO_IOPORT
669 select VIRT_TO_BUS
670 help
671 On the Acorn Risc-PC, Linux can support the internal IDE disk and
672 CD-ROM interface, serial and parallel port, and the floppy drive.
673
674 config ARCH_SA1100
675 bool "SA1100-based"
676 select ARCH_HAS_CPUFREQ
677 select ARCH_MTD_XIP
678 select ARCH_REQUIRE_GPIOLIB
679 select ARCH_SPARSEMEM_ENABLE
680 select CLKDEV_LOOKUP
681 select CLKSRC_MMIO
682 select CPU_FREQ
683 select CPU_SA1100
684 select GENERIC_CLOCKEVENTS
685 select HAVE_IDE
686 select ISA
687 select NEED_MACH_GPIO_H
688 select NEED_MACH_MEMORY_H
689 select SPARSE_IRQ
690 help
691 Support for StrongARM 11x0 based boards.
692
693 config ARCH_S3C24XX
694 bool "Samsung S3C24XX SoCs"
695 select ARCH_HAS_CPUFREQ
696 select ARCH_REQUIRE_GPIOLIB
697 select CLKDEV_LOOKUP
698 select CLKSRC_MMIO
699 select GENERIC_CLOCKEVENTS
700 select GPIO_SAMSUNG
701 select HAVE_CLK
702 select HAVE_S3C2410_I2C if I2C
703 select HAVE_S3C2410_WATCHDOG if WATCHDOG
704 select HAVE_S3C_RTC if RTC_CLASS
705 select MULTI_IRQ_HANDLER
706 select NEED_MACH_GPIO_H
707 select NEED_MACH_IO_H
708 select SAMSUNG_ATAGS
709 help
710 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
711 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
712 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
713 Samsung SMDK2410 development board (and derivatives).
714
715 config ARCH_S3C64XX
716 bool "Samsung S3C64XX"
717 select ARCH_HAS_CPUFREQ
718 select ARCH_REQUIRE_GPIOLIB
719 select ARM_VIC
720 select CLKDEV_LOOKUP
721 select CLKSRC_MMIO
722 select CPU_V6
723 select GENERIC_CLOCKEVENTS
724 select GPIO_SAMSUNG
725 select HAVE_CLK
726 select HAVE_S3C2410_I2C if I2C
727 select HAVE_S3C2410_WATCHDOG if WATCHDOG
728 select HAVE_TCM
729 select NEED_MACH_GPIO_H
730 select NO_IOPORT
731 select PLAT_SAMSUNG
732 select S3C_DEV_NAND
733 select S3C_GPIO_TRACK
734 select SAMSUNG_ATAGS
735 select SAMSUNG_CLKSRC
736 select SAMSUNG_GPIOLIB_4BIT
737 select SAMSUNG_IRQ_VIC_TIMER
738 select SAMSUNG_WDT_RESET
739 select USB_ARCH_HAS_OHCI
740 help
741 Samsung S3C64XX series based systems
742
743 config ARCH_S5P64X0
744 bool "Samsung S5P6440 S5P6450"
745 select CLKDEV_LOOKUP
746 select CLKSRC_MMIO
747 select CPU_V6
748 select GENERIC_CLOCKEVENTS
749 select GPIO_SAMSUNG
750 select HAVE_CLK
751 select HAVE_S3C2410_I2C if I2C
752 select HAVE_S3C2410_WATCHDOG if WATCHDOG
753 select HAVE_S3C_RTC if RTC_CLASS
754 select NEED_MACH_GPIO_H
755 select SAMSUNG_WDT_RESET
756 select SAMSUNG_ATAGS
757 help
758 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
759 SMDK6450.
760
761 config ARCH_S5PC100
762 bool "Samsung S5PC100"
763 select ARCH_REQUIRE_GPIOLIB
764 select CLKDEV_LOOKUP
765 select CLKSRC_MMIO
766 select CPU_V7
767 select GENERIC_CLOCKEVENTS
768 select GPIO_SAMSUNG
769 select HAVE_CLK
770 select HAVE_S3C2410_I2C if I2C
771 select HAVE_S3C2410_WATCHDOG if WATCHDOG
772 select HAVE_S3C_RTC if RTC_CLASS
773 select NEED_MACH_GPIO_H
774 select SAMSUNG_WDT_RESET
775 select SAMSUNG_ATAGS
776 help
777 Samsung S5PC100 series based systems
778
779 config ARCH_S5PV210
780 bool "Samsung S5PV210/S5PC110"
781 select ARCH_HAS_CPUFREQ
782 select ARCH_HAS_HOLES_MEMORYMODEL
783 select ARCH_SPARSEMEM_ENABLE
784 select CLKDEV_LOOKUP
785 select CLKSRC_MMIO
786 select CPU_V7
787 select GENERIC_CLOCKEVENTS
788 select GPIO_SAMSUNG
789 select HAVE_CLK
790 select HAVE_S3C2410_I2C if I2C
791 select HAVE_S3C2410_WATCHDOG if WATCHDOG
792 select HAVE_S3C_RTC if RTC_CLASS
793 select NEED_MACH_GPIO_H
794 select NEED_MACH_MEMORY_H
795 select SAMSUNG_ATAGS
796 help
797 Samsung S5PV210/S5PC110 series based systems
798
799 config ARCH_EXYNOS
800 bool "Samsung EXYNOS"
801 select ARCH_HAS_CPUFREQ
802 select ARCH_HAS_HOLES_MEMORYMODEL
803 select ARCH_REQUIRE_GPIOLIB
804 select ARCH_SPARSEMEM_ENABLE
805 select ARM_GIC
806 select CLKDEV_LOOKUP
807 select COMMON_CLK
808 select CPU_V7
809 select GENERIC_CLOCKEVENTS
810 select HAVE_CLK
811 select HAVE_S3C2410_I2C if I2C
812 select HAVE_S3C2410_WATCHDOG if WATCHDOG
813 select HAVE_S3C_RTC if RTC_CLASS
814 select NEED_MACH_MEMORY_H
815 select SPARSE_IRQ
816 select USE_OF
817 help
818 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
819
820 config ARCH_SHARK
821 bool "Shark"
822 select ARCH_USES_GETTIMEOFFSET
823 select CPU_SA110
824 select ISA
825 select ISA_DMA
826 select NEED_MACH_MEMORY_H
827 select PCI
828 select VIRT_TO_BUS
829 select ZONE_DMA
830 help
831 Support for the StrongARM based Digital DNARD machine, also known
832 as "Shark" (<http://www.shark-linux.de/shark.html>).
833
834 config ARCH_DAVINCI
835 bool "TI DaVinci"
836 select ARCH_HAS_HOLES_MEMORYMODEL
837 select ARCH_REQUIRE_GPIOLIB
838 select CLKDEV_LOOKUP
839 select GENERIC_ALLOCATOR
840 select GENERIC_CLOCKEVENTS
841 select GENERIC_IRQ_CHIP
842 select HAVE_IDE
843 select NEED_MACH_GPIO_H
844 select TI_PRIV_EDMA
845 select USE_OF
846 select ZONE_DMA
847 help
848 Support for TI's DaVinci platform.
849
850 config ARCH_OMAP1
851 bool "TI OMAP1"
852 depends on MMU
853 select ARCH_HAS_CPUFREQ
854 select ARCH_HAS_HOLES_MEMORYMODEL
855 select ARCH_OMAP
856 select ARCH_REQUIRE_GPIOLIB
857 select CLKDEV_LOOKUP
858 select CLKSRC_MMIO
859 select GENERIC_CLOCKEVENTS
860 select GENERIC_IRQ_CHIP
861 select HAVE_CLK
862 select HAVE_IDE
863 select IRQ_DOMAIN
864 select NEED_MACH_IO_H if PCCARD
865 select NEED_MACH_MEMORY_H
866 help
867 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
868
869 endchoice
870
871 menu "Multiple platform selection"
872 depends on ARCH_MULTIPLATFORM
873
874 comment "CPU Core family selection"
875
876 config ARCH_MULTI_V4T
877 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
878 depends on !ARCH_MULTI_V6_V7
879 select ARCH_MULTI_V4_V5
880 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
881 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
882 CPU_ARM925T || CPU_ARM940T)
883
884 config ARCH_MULTI_V5
885 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
886 depends on !ARCH_MULTI_V6_V7
887 select ARCH_MULTI_V4_V5
888 select CPU_ARM926T if (!CPU_ARM946E || CPU_ARM1020 || \
889 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
890 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
891
892 config ARCH_MULTI_V4_V5
893 bool
894
895 config ARCH_MULTI_V6
896 bool "ARMv6 based platforms (ARM11)"
897 select ARCH_MULTI_V6_V7
898 select CPU_V6
899
900 config ARCH_MULTI_V7
901 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
902 default y
903 select ARCH_MULTI_V6_V7
904 select CPU_V7
905
906 config ARCH_MULTI_V6_V7
907 bool
908
909 config ARCH_MULTI_CPU_AUTO
910 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
911 select ARCH_MULTI_V5
912
913 endmenu
914
915 #
916 # This is sorted alphabetically by mach-* pathname. However, plat-*
917 # Kconfigs may be included either alphabetically (according to the
918 # plat- suffix) or along side the corresponding mach-* source.
919 #
920 source "arch/arm/mach-mvebu/Kconfig"
921
922 source "arch/arm/mach-at91/Kconfig"
923
924 source "arch/arm/mach-bcm/Kconfig"
925
926 source "arch/arm/mach-bcm2835/Kconfig"
927
928 source "arch/arm/mach-clps711x/Kconfig"
929
930 source "arch/arm/mach-cns3xxx/Kconfig"
931
932 source "arch/arm/mach-davinci/Kconfig"
933
934 source "arch/arm/mach-dove/Kconfig"
935
936 source "arch/arm/mach-ep93xx/Kconfig"
937
938 source "arch/arm/mach-footbridge/Kconfig"
939
940 source "arch/arm/mach-gemini/Kconfig"
941
942 source "arch/arm/mach-highbank/Kconfig"
943
944 source "arch/arm/mach-integrator/Kconfig"
945
946 source "arch/arm/mach-iop32x/Kconfig"
947
948 source "arch/arm/mach-iop33x/Kconfig"
949
950 source "arch/arm/mach-iop13xx/Kconfig"
951
952 source "arch/arm/mach-ixp4xx/Kconfig"
953
954 source "arch/arm/mach-keystone/Kconfig"
955
956 source "arch/arm/mach-kirkwood/Kconfig"
957
958 source "arch/arm/mach-ks8695/Kconfig"
959
960 source "arch/arm/mach-msm/Kconfig"
961
962 source "arch/arm/mach-mv78xx0/Kconfig"
963
964 source "arch/arm/mach-imx/Kconfig"
965
966 source "arch/arm/mach-mxs/Kconfig"
967
968 source "arch/arm/mach-netx/Kconfig"
969
970 source "arch/arm/mach-nomadik/Kconfig"
971
972 source "arch/arm/mach-nspire/Kconfig"
973
974 source "arch/arm/plat-omap/Kconfig"
975
976 source "arch/arm/mach-omap1/Kconfig"
977
978 source "arch/arm/mach-omap2/Kconfig"
979
980 source "arch/arm/mach-orion5x/Kconfig"
981
982 source "arch/arm/mach-picoxcell/Kconfig"
983
984 source "arch/arm/mach-pxa/Kconfig"
985 source "arch/arm/plat-pxa/Kconfig"
986
987 source "arch/arm/mach-mmp/Kconfig"
988
989 source "arch/arm/mach-realview/Kconfig"
990
991 source "arch/arm/mach-rockchip/Kconfig"
992
993 source "arch/arm/mach-sa1100/Kconfig"
994
995 source "arch/arm/plat-samsung/Kconfig"
996
997 source "arch/arm/mach-socfpga/Kconfig"
998
999 source "arch/arm/mach-spear/Kconfig"
1000
1001 source "arch/arm/mach-sti/Kconfig"
1002
1003 source "arch/arm/mach-s3c24xx/Kconfig"
1004
1005 if ARCH_S3C64XX
1006 source "arch/arm/mach-s3c64xx/Kconfig"
1007 endif
1008
1009 source "arch/arm/mach-s5p64x0/Kconfig"
1010
1011 source "arch/arm/mach-s5pc100/Kconfig"
1012
1013 source "arch/arm/mach-s5pv210/Kconfig"
1014
1015 source "arch/arm/mach-exynos/Kconfig"
1016
1017 source "arch/arm/mach-shmobile/Kconfig"
1018
1019 source "arch/arm/mach-sunxi/Kconfig"
1020
1021 source "arch/arm/mach-prima2/Kconfig"
1022
1023 source "arch/arm/mach-tegra/Kconfig"
1024
1025 source "arch/arm/mach-u300/Kconfig"
1026
1027 source "arch/arm/mach-ux500/Kconfig"
1028
1029 source "arch/arm/mach-versatile/Kconfig"
1030
1031 source "arch/arm/mach-vexpress/Kconfig"
1032 source "arch/arm/plat-versatile/Kconfig"
1033
1034 source "arch/arm/mach-virt/Kconfig"
1035
1036 source "arch/arm/mach-vt8500/Kconfig"
1037
1038 source "arch/arm/mach-w90x900/Kconfig"
1039
1040 source "arch/arm/mach-zynq/Kconfig"
1041
1042 # Definitions to make life easier
1043 config ARCH_ACORN
1044 bool
1045
1046 config PLAT_IOP
1047 bool
1048 select GENERIC_CLOCKEVENTS
1049
1050 config PLAT_ORION
1051 bool
1052 select CLKSRC_MMIO
1053 select COMMON_CLK
1054 select GENERIC_IRQ_CHIP
1055 select IRQ_DOMAIN
1056
1057 config PLAT_ORION_LEGACY
1058 bool
1059 select PLAT_ORION
1060
1061 config PLAT_PXA
1062 bool
1063
1064 config PLAT_VERSATILE
1065 bool
1066
1067 config ARM_TIMER_SP804
1068 bool
1069 select CLKSRC_MMIO
1070 select CLKSRC_OF if OF
1071
1072 source arch/arm/mm/Kconfig
1073
1074 config ARM_NR_BANKS
1075 int
1076 default 16 if ARCH_EP93XX
1077 default 8
1078
1079 config IWMMXT
1080 bool "Enable iWMMXt support" if !CPU_PJ4
1081 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1082 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
1083 help
1084 Enable support for iWMMXt context switching at run time if
1085 running on a CPU that supports it.
1086
1087 config XSCALE_PMU
1088 bool
1089 depends on CPU_XSCALE
1090 default y
1091
1092 config MULTI_IRQ_HANDLER
1093 bool
1094 help
1095 Allow each machine to specify it's own IRQ handler at run time.
1096
1097 if !MMU
1098 source "arch/arm/Kconfig-nommu"
1099 endif
1100
1101 config PJ4B_ERRATA_4742
1102 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1103 depends on CPU_PJ4B && MACH_ARMADA_370
1104 default y
1105 help
1106 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1107 Event (WFE) IDLE states, a specific timing sensitivity exists between
1108 the retiring WFI/WFE instructions and the newly issued subsequent
1109 instructions. This sensitivity can result in a CPU hang scenario.
1110 Workaround:
1111 The software must insert either a Data Synchronization Barrier (DSB)
1112 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1113 instruction
1114
1115 config ARM_ERRATA_326103
1116 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1117 depends on CPU_V6
1118 help
1119 Executing a SWP instruction to read-only memory does not set bit 11
1120 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1121 treat the access as a read, preventing a COW from occurring and
1122 causing the faulting task to livelock.
1123
1124 config ARM_ERRATA_411920
1125 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1126 depends on CPU_V6 || CPU_V6K
1127 help
1128 Invalidation of the Instruction Cache operation can
1129 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1130 It does not affect the MPCore. This option enables the ARM Ltd.
1131 recommended workaround.
1132
1133 config ARM_ERRATA_430973
1134 bool "ARM errata: Stale prediction on replaced interworking branch"
1135 depends on CPU_V7
1136 help
1137 This option enables the workaround for the 430973 Cortex-A8
1138 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1139 interworking branch is replaced with another code sequence at the
1140 same virtual address, whether due to self-modifying code or virtual
1141 to physical address re-mapping, Cortex-A8 does not recover from the
1142 stale interworking branch prediction. This results in Cortex-A8
1143 executing the new code sequence in the incorrect ARM or Thumb state.
1144 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1145 and also flushes the branch target cache at every context switch.
1146 Note that setting specific bits in the ACTLR register may not be
1147 available in non-secure mode.
1148
1149 config ARM_ERRATA_458693
1150 bool "ARM errata: Processor deadlock when a false hazard is created"
1151 depends on CPU_V7
1152 depends on !ARCH_MULTIPLATFORM
1153 help
1154 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1155 erratum. For very specific sequences of memory operations, it is
1156 possible for a hazard condition intended for a cache line to instead
1157 be incorrectly associated with a different cache line. This false
1158 hazard might then cause a processor deadlock. The workaround enables
1159 the L1 caching of the NEON accesses and disables the PLD instruction
1160 in the ACTLR register. Note that setting specific bits in the ACTLR
1161 register may not be available in non-secure mode.
1162
1163 config ARM_ERRATA_460075
1164 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1165 depends on CPU_V7
1166 depends on !ARCH_MULTIPLATFORM
1167 help
1168 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1169 erratum. Any asynchronous access to the L2 cache may encounter a
1170 situation in which recent store transactions to the L2 cache are lost
1171 and overwritten with stale memory contents from external memory. The
1172 workaround disables the write-allocate mode for the L2 cache via the
1173 ACTLR register. Note that setting specific bits in the ACTLR register
1174 may not be available in non-secure mode.
1175
1176 config ARM_ERRATA_742230
1177 bool "ARM errata: DMB operation may be faulty"
1178 depends on CPU_V7 && SMP
1179 depends on !ARCH_MULTIPLATFORM
1180 help
1181 This option enables the workaround for the 742230 Cortex-A9
1182 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1183 between two write operations may not ensure the correct visibility
1184 ordering of the two writes. This workaround sets a specific bit in
1185 the diagnostic register of the Cortex-A9 which causes the DMB
1186 instruction to behave as a DSB, ensuring the correct behaviour of
1187 the two writes.
1188
1189 config ARM_ERRATA_742231
1190 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1191 depends on CPU_V7 && SMP
1192 depends on !ARCH_MULTIPLATFORM
1193 help
1194 This option enables the workaround for the 742231 Cortex-A9
1195 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1196 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1197 accessing some data located in the same cache line, may get corrupted
1198 data due to bad handling of the address hazard when the line gets
1199 replaced from one of the CPUs at the same time as another CPU is
1200 accessing it. This workaround sets specific bits in the diagnostic
1201 register of the Cortex-A9 which reduces the linefill issuing
1202 capabilities of the processor.
1203
1204 config PL310_ERRATA_588369
1205 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1206 depends on CACHE_L2X0
1207 help
1208 The PL310 L2 cache controller implements three types of Clean &
1209 Invalidate maintenance operations: by Physical Address
1210 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1211 They are architecturally defined to behave as the execution of a
1212 clean operation followed immediately by an invalidate operation,
1213 both performing to the same memory location. This functionality
1214 is not correctly implemented in PL310 as clean lines are not
1215 invalidated as a result of these operations.
1216
1217 config ARM_ERRATA_643719
1218 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1219 depends on CPU_V7 && SMP
1220 help
1221 This option enables the workaround for the 643719 Cortex-A9 (prior to
1222 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1223 register returns zero when it should return one. The workaround
1224 corrects this value, ensuring cache maintenance operations which use
1225 it behave as intended and avoiding data corruption.
1226
1227 config ARM_ERRATA_720789
1228 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1229 depends on CPU_V7
1230 help
1231 This option enables the workaround for the 720789 Cortex-A9 (prior to
1232 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1233 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1234 As a consequence of this erratum, some TLB entries which should be
1235 invalidated are not, resulting in an incoherency in the system page
1236 tables. The workaround changes the TLB flushing routines to invalidate
1237 entries regardless of the ASID.
1238
1239 config PL310_ERRATA_727915
1240 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1241 depends on CACHE_L2X0
1242 help
1243 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1244 operation (offset 0x7FC). This operation runs in background so that
1245 PL310 can handle normal accesses while it is in progress. Under very
1246 rare circumstances, due to this erratum, write data can be lost when
1247 PL310 treats a cacheable write transaction during a Clean &
1248 Invalidate by Way operation.
1249
1250 config ARM_ERRATA_743622
1251 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1252 depends on CPU_V7
1253 depends on !ARCH_MULTIPLATFORM
1254 help
1255 This option enables the workaround for the 743622 Cortex-A9
1256 (r2p*) erratum. Under very rare conditions, a faulty
1257 optimisation in the Cortex-A9 Store Buffer may lead to data
1258 corruption. This workaround sets a specific bit in the diagnostic
1259 register of the Cortex-A9 which disables the Store Buffer
1260 optimisation, preventing the defect from occurring. This has no
1261 visible impact on the overall performance or power consumption of the
1262 processor.
1263
1264 config ARM_ERRATA_751472
1265 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1266 depends on CPU_V7
1267 depends on !ARCH_MULTIPLATFORM
1268 help
1269 This option enables the workaround for the 751472 Cortex-A9 (prior
1270 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1271 completion of a following broadcasted operation if the second
1272 operation is received by a CPU before the ICIALLUIS has completed,
1273 potentially leading to corrupted entries in the cache or TLB.
1274
1275 config PL310_ERRATA_753970
1276 bool "PL310 errata: cache sync operation may be faulty"
1277 depends on CACHE_PL310
1278 help
1279 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1280
1281 Under some condition the effect of cache sync operation on
1282 the store buffer still remains when the operation completes.
1283 This means that the store buffer is always asked to drain and
1284 this prevents it from merging any further writes. The workaround
1285 is to replace the normal offset of cache sync operation (0x730)
1286 by another offset targeting an unmapped PL310 register 0x740.
1287 This has the same effect as the cache sync operation: store buffer
1288 drain and waiting for all buffers empty.
1289
1290 config ARM_ERRATA_754322
1291 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1292 depends on CPU_V7
1293 help
1294 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1295 r3p*) erratum. A speculative memory access may cause a page table walk
1296 which starts prior to an ASID switch but completes afterwards. This
1297 can populate the micro-TLB with a stale entry which may be hit with
1298 the new ASID. This workaround places two dsb instructions in the mm
1299 switching code so that no page table walks can cross the ASID switch.
1300
1301 config ARM_ERRATA_754327
1302 bool "ARM errata: no automatic Store Buffer drain"
1303 depends on CPU_V7 && SMP
1304 help
1305 This option enables the workaround for the 754327 Cortex-A9 (prior to
1306 r2p0) erratum. The Store Buffer does not have any automatic draining
1307 mechanism and therefore a livelock may occur if an external agent
1308 continuously polls a memory location waiting to observe an update.
1309 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1310 written polling loops from denying visibility of updates to memory.
1311
1312 config ARM_ERRATA_364296
1313 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1314 depends on CPU_V6 && !SMP
1315 help
1316 This options enables the workaround for the 364296 ARM1136
1317 r0p2 erratum (possible cache data corruption with
1318 hit-under-miss enabled). It sets the undocumented bit 31 in
1319 the auxiliary control register and the FI bit in the control
1320 register, thus disabling hit-under-miss without putting the
1321 processor into full low interrupt latency mode. ARM11MPCore
1322 is not affected.
1323
1324 config ARM_ERRATA_764369
1325 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1326 depends on CPU_V7 && SMP
1327 help
1328 This option enables the workaround for erratum 764369
1329 affecting Cortex-A9 MPCore with two or more processors (all
1330 current revisions). Under certain timing circumstances, a data
1331 cache line maintenance operation by MVA targeting an Inner
1332 Shareable memory region may fail to proceed up to either the
1333 Point of Coherency or to the Point of Unification of the
1334 system. This workaround adds a DSB instruction before the
1335 relevant cache maintenance functions and sets a specific bit
1336 in the diagnostic control register of the SCU.
1337
1338 config PL310_ERRATA_769419
1339 bool "PL310 errata: no automatic Store Buffer drain"
1340 depends on CACHE_L2X0
1341 help
1342 On revisions of the PL310 prior to r3p2, the Store Buffer does
1343 not automatically drain. This can cause normal, non-cacheable
1344 writes to be retained when the memory system is idle, leading
1345 to suboptimal I/O performance for drivers using coherent DMA.
1346 This option adds a write barrier to the cpu_idle loop so that,
1347 on systems with an outer cache, the store buffer is drained
1348 explicitly.
1349
1350 config ARM_ERRATA_775420
1351 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1352 depends on CPU_V7
1353 help
1354 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1355 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1356 operation aborts with MMU exception, it might cause the processor
1357 to deadlock. This workaround puts DSB before executing ISB if
1358 an abort may occur on cache maintenance.
1359
1360 config ARM_ERRATA_798181
1361 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1362 depends on CPU_V7 && SMP
1363 help
1364 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1365 adequately shooting down all use of the old entries. This
1366 option enables the Linux kernel workaround for this erratum
1367 which sends an IPI to the CPUs that are running the same ASID
1368 as the one being invalidated.
1369
1370 endmenu
1371
1372 source "arch/arm/common/Kconfig"
1373
1374 menu "Bus support"
1375
1376 config ARM_AMBA
1377 bool
1378
1379 config ISA
1380 bool
1381 help
1382 Find out whether you have ISA slots on your motherboard. ISA is the
1383 name of a bus system, i.e. the way the CPU talks to the other stuff
1384 inside your box. Other bus systems are PCI, EISA, MicroChannel
1385 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1386 newer boards don't support it. If you have ISA, say Y, otherwise N.
1387
1388 # Select ISA DMA controller support
1389 config ISA_DMA
1390 bool
1391 select ISA_DMA_API
1392
1393 # Select ISA DMA interface
1394 config ISA_DMA_API
1395 bool
1396
1397 config PCI
1398 bool "PCI support" if MIGHT_HAVE_PCI
1399 help
1400 Find out whether you have a PCI motherboard. PCI is the name of a
1401 bus system, i.e. the way the CPU talks to the other stuff inside
1402 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1403 VESA. If you have PCI, say Y, otherwise N.
1404
1405 config PCI_DOMAINS
1406 bool
1407 depends on PCI
1408
1409 config PCI_NANOENGINE
1410 bool "BSE nanoEngine PCI support"
1411 depends on SA1100_NANOENGINE
1412 help
1413 Enable PCI on the BSE nanoEngine board.
1414
1415 config PCI_SYSCALL
1416 def_bool PCI
1417
1418 # Select the host bridge type
1419 config PCI_HOST_VIA82C505
1420 bool
1421 depends on PCI && ARCH_SHARK
1422 default y
1423
1424 config PCI_HOST_ITE8152
1425 bool
1426 depends on PCI && MACH_ARMCORE
1427 default y
1428 select DMABOUNCE
1429
1430 source "drivers/pci/Kconfig"
1431 source "drivers/pci/pcie/Kconfig"
1432
1433 source "drivers/pcmcia/Kconfig"
1434
1435 endmenu
1436
1437 menu "Kernel Features"
1438
1439 config HAVE_SMP
1440 bool
1441 help
1442 This option should be selected by machines which have an SMP-
1443 capable CPU.
1444
1445 The only effect of this option is to make the SMP-related
1446 options available to the user for configuration.
1447
1448 config SMP
1449 bool "Symmetric Multi-Processing"
1450 depends on CPU_V6K || CPU_V7
1451 depends on GENERIC_CLOCKEVENTS
1452 depends on HAVE_SMP
1453 depends on MMU
1454 select USE_GENERIC_SMP_HELPERS
1455 help
1456 This enables support for systems with more than one CPU. If you have
1457 a system with only one CPU, like most personal computers, say N. If
1458 you have a system with more than one CPU, say Y.
1459
1460 If you say N here, the kernel will run on single and multiprocessor
1461 machines, but will use only one CPU of a multiprocessor machine. If
1462 you say Y here, the kernel will run on many, but not all, single
1463 processor machines. On a single processor machine, the kernel will
1464 run faster if you say N here.
1465
1466 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1467 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1468 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1469
1470 If you don't know what to do here, say N.
1471
1472 config SMP_ON_UP
1473 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1474 depends on SMP && !XIP_KERNEL
1475 default y
1476 help
1477 SMP kernels contain instructions which fail on non-SMP processors.
1478 Enabling this option allows the kernel to modify itself to make
1479 these instructions safe. Disabling it allows about 1K of space
1480 savings.
1481
1482 If you don't know what to do here, say Y.
1483
1484 config ARM_CPU_TOPOLOGY
1485 bool "Support cpu topology definition"
1486 depends on SMP && CPU_V7
1487 default y
1488 help
1489 Support ARM cpu topology definition. The MPIDR register defines
1490 affinity between processors which is then used to describe the cpu
1491 topology of an ARM System.
1492
1493 config SCHED_MC
1494 bool "Multi-core scheduler support"
1495 depends on ARM_CPU_TOPOLOGY
1496 help
1497 Multi-core scheduler support improves the CPU scheduler's decision
1498 making when dealing with multi-core CPU chips at a cost of slightly
1499 increased overhead in some places. If unsure say N here.
1500
1501 config SCHED_SMT
1502 bool "SMT scheduler support"
1503 depends on ARM_CPU_TOPOLOGY
1504 help
1505 Improves the CPU scheduler's decision making when dealing with
1506 MultiThreading at a cost of slightly increased overhead in some
1507 places. If unsure say N here.
1508
1509 config HAVE_ARM_SCU
1510 bool
1511 help
1512 This option enables support for the ARM system coherency unit
1513
1514 config HAVE_ARM_ARCH_TIMER
1515 bool "Architected timer support"
1516 depends on CPU_V7
1517 select ARM_ARCH_TIMER
1518 help
1519 This option enables support for the ARM architected timer
1520
1521 config HAVE_ARM_TWD
1522 bool
1523 depends on SMP
1524 select CLKSRC_OF if OF
1525 help
1526 This options enables support for the ARM timer and watchdog unit
1527
1528 config MCPM
1529 bool "Multi-Cluster Power Management"
1530 depends on CPU_V7 && SMP
1531 help
1532 This option provides the common power management infrastructure
1533 for (multi-)cluster based systems, such as big.LITTLE based
1534 systems.
1535
1536 choice
1537 prompt "Memory split"
1538 default VMSPLIT_3G
1539 help
1540 Select the desired split between kernel and user memory.
1541
1542 If you are not absolutely sure what you are doing, leave this
1543 option alone!
1544
1545 config VMSPLIT_3G
1546 bool "3G/1G user/kernel split"
1547 config VMSPLIT_2G
1548 bool "2G/2G user/kernel split"
1549 config VMSPLIT_1G
1550 bool "1G/3G user/kernel split"
1551 endchoice
1552
1553 config PAGE_OFFSET
1554 hex
1555 default 0x40000000 if VMSPLIT_1G
1556 default 0x80000000 if VMSPLIT_2G
1557 default 0xC0000000
1558
1559 config NR_CPUS
1560 int "Maximum number of CPUs (2-32)"
1561 range 2 32
1562 depends on SMP
1563 default "4"
1564
1565 config HOTPLUG_CPU
1566 bool "Support for hot-pluggable CPUs"
1567 depends on SMP
1568 help
1569 Say Y here to experiment with turning CPUs off and on. CPUs
1570 can be controlled through /sys/devices/system/cpu.
1571
1572 config ARM_PSCI
1573 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1574 depends on CPU_V7
1575 help
1576 Say Y here if you want Linux to communicate with system firmware
1577 implementing the PSCI specification for CPU-centric power
1578 management operations described in ARM document number ARM DEN
1579 0022A ("Power State Coordination Interface System Software on
1580 ARM processors").
1581
1582 config LOCAL_TIMERS
1583 bool "Use local timer interrupts"
1584 depends on SMP
1585 default y
1586 help
1587 Enable support for local timers on SMP platforms, rather then the
1588 legacy IPI broadcast method. Local timers allows the system
1589 accounting to be spread across the timer interval, preventing a
1590 "thundering herd" at every timer tick.
1591
1592 # The GPIO number here must be sorted by descending number. In case of
1593 # a multiplatform kernel, we just want the highest value required by the
1594 # selected platforms.
1595 config ARCH_NR_GPIO
1596 int
1597 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1598 default 512 if SOC_OMAP5
1599 default 512 if ARCH_KEYSTONE
1600 default 392 if ARCH_U8500
1601 default 352 if ARCH_VT8500
1602 default 288 if ARCH_SUNXI
1603 default 264 if MACH_H4700
1604 default 0
1605 help
1606 Maximum number of GPIOs in the system.
1607
1608 If unsure, leave the default value.
1609
1610 source kernel/Kconfig.preempt
1611
1612 config HZ
1613 int
1614 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1615 ARCH_S5PV210 || ARCH_EXYNOS4
1616 default AT91_TIMER_HZ if ARCH_AT91
1617 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1618 default 100
1619
1620 config SCHED_HRTICK
1621 def_bool HIGH_RES_TIMERS
1622
1623 config THUMB2_KERNEL
1624 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1625 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1626 default y if CPU_THUMBONLY
1627 select AEABI
1628 select ARM_ASM_UNIFIED
1629 select ARM_UNWIND
1630 help
1631 By enabling this option, the kernel will be compiled in
1632 Thumb-2 mode. A compiler/assembler that understand the unified
1633 ARM-Thumb syntax is needed.
1634
1635 If unsure, say N.
1636
1637 config THUMB2_AVOID_R_ARM_THM_JUMP11
1638 bool "Work around buggy Thumb-2 short branch relocations in gas"
1639 depends on THUMB2_KERNEL && MODULES
1640 default y
1641 help
1642 Various binutils versions can resolve Thumb-2 branches to
1643 locally-defined, preemptible global symbols as short-range "b.n"
1644 branch instructions.
1645
1646 This is a problem, because there's no guarantee the final
1647 destination of the symbol, or any candidate locations for a
1648 trampoline, are within range of the branch. For this reason, the
1649 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1650 relocation in modules at all, and it makes little sense to add
1651 support.
1652
1653 The symptom is that the kernel fails with an "unsupported
1654 relocation" error when loading some modules.
1655
1656 Until fixed tools are available, passing
1657 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1658 code which hits this problem, at the cost of a bit of extra runtime
1659 stack usage in some cases.
1660
1661 The problem is described in more detail at:
1662 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1663
1664 Only Thumb-2 kernels are affected.
1665
1666 Unless you are sure your tools don't have this problem, say Y.
1667
1668 config ARM_ASM_UNIFIED
1669 bool
1670
1671 config AEABI
1672 bool "Use the ARM EABI to compile the kernel"
1673 help
1674 This option allows for the kernel to be compiled using the latest
1675 ARM ABI (aka EABI). This is only useful if you are using a user
1676 space environment that is also compiled with EABI.
1677
1678 Since there are major incompatibilities between the legacy ABI and
1679 EABI, especially with regard to structure member alignment, this
1680 option also changes the kernel syscall calling convention to
1681 disambiguate both ABIs and allow for backward compatibility support
1682 (selected with CONFIG_OABI_COMPAT).
1683
1684 To use this you need GCC version 4.0.0 or later.
1685
1686 config OABI_COMPAT
1687 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1688 depends on AEABI && !THUMB2_KERNEL
1689 default y
1690 help
1691 This option preserves the old syscall interface along with the
1692 new (ARM EABI) one. It also provides a compatibility layer to
1693 intercept syscalls that have structure arguments which layout
1694 in memory differs between the legacy ABI and the new ARM EABI
1695 (only for non "thumb" binaries). This option adds a tiny
1696 overhead to all syscalls and produces a slightly larger kernel.
1697 If you know you'll be using only pure EABI user space then you
1698 can say N here. If this option is not selected and you attempt
1699 to execute a legacy ABI binary then the result will be
1700 UNPREDICTABLE (in fact it can be predicted that it won't work
1701 at all). If in doubt say Y.
1702
1703 config ARCH_HAS_HOLES_MEMORYMODEL
1704 bool
1705
1706 config ARCH_SPARSEMEM_ENABLE
1707 bool
1708
1709 config ARCH_SPARSEMEM_DEFAULT
1710 def_bool ARCH_SPARSEMEM_ENABLE
1711
1712 config ARCH_SELECT_MEMORY_MODEL
1713 def_bool ARCH_SPARSEMEM_ENABLE
1714
1715 config HAVE_ARCH_PFN_VALID
1716 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1717
1718 config HIGHMEM
1719 bool "High Memory Support"
1720 depends on MMU
1721 help
1722 The address space of ARM processors is only 4 Gigabytes large
1723 and it has to accommodate user address space, kernel address
1724 space as well as some memory mapped IO. That means that, if you
1725 have a large amount of physical memory and/or IO, not all of the
1726 memory can be "permanently mapped" by the kernel. The physical
1727 memory that is not permanently mapped is called "high memory".
1728
1729 Depending on the selected kernel/user memory split, minimum
1730 vmalloc space and actual amount of RAM, you may not need this
1731 option which should result in a slightly faster kernel.
1732
1733 If unsure, say n.
1734
1735 config HIGHPTE
1736 bool "Allocate 2nd-level pagetables from highmem"
1737 depends on HIGHMEM
1738
1739 config HW_PERF_EVENTS
1740 bool "Enable hardware performance counter support for perf events"
1741 depends on PERF_EVENTS
1742 default y
1743 help
1744 Enable hardware performance counter support for perf events. If
1745 disabled, perf events will use software events only.
1746
1747 source "mm/Kconfig"
1748
1749 config FORCE_MAX_ZONEORDER
1750 int "Maximum zone order" if ARCH_SHMOBILE
1751 range 11 64 if ARCH_SHMOBILE
1752 default "12" if SOC_AM33XX
1753 default "9" if SA1111
1754 default "11"
1755 help
1756 The kernel memory allocator divides physically contiguous memory
1757 blocks into "zones", where each zone is a power of two number of
1758 pages. This option selects the largest power of two that the kernel
1759 keeps in the memory allocator. If you need to allocate very large
1760 blocks of physically contiguous memory, then you may need to
1761 increase this value.
1762
1763 This config option is actually maximum order plus one. For example,
1764 a value of 11 means that the largest free memory block is 2^10 pages.
1765
1766 config ALIGNMENT_TRAP
1767 bool
1768 depends on CPU_CP15_MMU
1769 default y if !ARCH_EBSA110
1770 select HAVE_PROC_CPU if PROC_FS
1771 help
1772 ARM processors cannot fetch/store information which is not
1773 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1774 address divisible by 4. On 32-bit ARM processors, these non-aligned
1775 fetch/store instructions will be emulated in software if you say
1776 here, which has a severe performance impact. This is necessary for
1777 correct operation of some network protocols. With an IP-only
1778 configuration it is safe to say N, otherwise say Y.
1779
1780 config UACCESS_WITH_MEMCPY
1781 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1782 depends on MMU
1783 default y if CPU_FEROCEON
1784 help
1785 Implement faster copy_to_user and clear_user methods for CPU
1786 cores where a 8-word STM instruction give significantly higher
1787 memory write throughput than a sequence of individual 32bit stores.
1788
1789 A possible side effect is a slight increase in scheduling latency
1790 between threads sharing the same address space if they invoke
1791 such copy operations with large buffers.
1792
1793 However, if the CPU data cache is using a write-allocate mode,
1794 this option is unlikely to provide any performance gain.
1795
1796 config SECCOMP
1797 bool
1798 prompt "Enable seccomp to safely compute untrusted bytecode"
1799 ---help---
1800 This kernel feature is useful for number crunching applications
1801 that may need to compute untrusted bytecode during their
1802 execution. By using pipes or other transports made available to
1803 the process as file descriptors supporting the read/write
1804 syscalls, it's possible to isolate those applications in
1805 their own address space using seccomp. Once seccomp is
1806 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1807 and the task is only allowed to execute a few safe syscalls
1808 defined by each seccomp mode.
1809
1810 config CC_STACKPROTECTOR
1811 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1812 help
1813 This option turns on the -fstack-protector GCC feature. This
1814 feature puts, at the beginning of functions, a canary value on
1815 the stack just before the return address, and validates
1816 the value just before actually returning. Stack based buffer
1817 overflows (that need to overwrite this return address) now also
1818 overwrite the canary, which gets detected and the attack is then
1819 neutralized via a kernel panic.
1820 This feature requires gcc version 4.2 or above.
1821
1822 config XEN_DOM0
1823 def_bool y
1824 depends on XEN
1825
1826 config XEN
1827 bool "Xen guest support on ARM (EXPERIMENTAL)"
1828 depends on ARM && AEABI && OF
1829 depends on CPU_V7 && !CPU_V6
1830 depends on !GENERIC_ATOMIC64
1831 select ARM_PSCI
1832 help
1833 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1834
1835 endmenu
1836
1837 menu "Boot options"
1838
1839 config USE_OF
1840 bool "Flattened Device Tree support"
1841 select IRQ_DOMAIN
1842 select OF
1843 select OF_EARLY_FLATTREE
1844 help
1845 Include support for flattened device tree machine descriptions.
1846
1847 config ATAGS
1848 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1849 default y
1850 help
1851 This is the traditional way of passing data to the kernel at boot
1852 time. If you are solely relying on the flattened device tree (or
1853 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1854 to remove ATAGS support from your kernel binary. If unsure,
1855 leave this to y.
1856
1857 config DEPRECATED_PARAM_STRUCT
1858 bool "Provide old way to pass kernel parameters"
1859 depends on ATAGS
1860 help
1861 This was deprecated in 2001 and announced to live on for 5 years.
1862 Some old boot loaders still use this way.
1863
1864 # Compressed boot loader in ROM. Yes, we really want to ask about
1865 # TEXT and BSS so we preserve their values in the config files.
1866 config ZBOOT_ROM_TEXT
1867 hex "Compressed ROM boot loader base address"
1868 default "0"
1869 help
1870 The physical address at which the ROM-able zImage is to be
1871 placed in the target. Platforms which normally make use of
1872 ROM-able zImage formats normally set this to a suitable
1873 value in their defconfig file.
1874
1875 If ZBOOT_ROM is not enabled, this has no effect.
1876
1877 config ZBOOT_ROM_BSS
1878 hex "Compressed ROM boot loader BSS address"
1879 default "0"
1880 help
1881 The base address of an area of read/write memory in the target
1882 for the ROM-able zImage which must be available while the
1883 decompressor is running. It must be large enough to hold the
1884 entire decompressed kernel plus an additional 128 KiB.
1885 Platforms which normally make use of ROM-able zImage formats
1886 normally set this to a suitable value in their defconfig file.
1887
1888 If ZBOOT_ROM is not enabled, this has no effect.
1889
1890 config ZBOOT_ROM
1891 bool "Compressed boot loader in ROM/flash"
1892 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1893 help
1894 Say Y here if you intend to execute your compressed kernel image
1895 (zImage) directly from ROM or flash. If unsure, say N.
1896
1897 choice
1898 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1899 depends on ZBOOT_ROM && ARCH_SH7372
1900 default ZBOOT_ROM_NONE
1901 help
1902 Include experimental SD/MMC loading code in the ROM-able zImage.
1903 With this enabled it is possible to write the ROM-able zImage
1904 kernel image to an MMC or SD card and boot the kernel straight
1905 from the reset vector. At reset the processor Mask ROM will load
1906 the first part of the ROM-able zImage which in turn loads the
1907 rest the kernel image to RAM.
1908
1909 config ZBOOT_ROM_NONE
1910 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1911 help
1912 Do not load image from SD or MMC
1913
1914 config ZBOOT_ROM_MMCIF
1915 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1916 help
1917 Load image from MMCIF hardware block.
1918
1919 config ZBOOT_ROM_SH_MOBILE_SDHI
1920 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1921 help
1922 Load image from SDHI hardware block
1923
1924 endchoice
1925
1926 config ARM_APPENDED_DTB
1927 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1928 depends on OF && !ZBOOT_ROM
1929 help
1930 With this option, the boot code will look for a device tree binary
1931 (DTB) appended to zImage
1932 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1933
1934 This is meant as a backward compatibility convenience for those
1935 systems with a bootloader that can't be upgraded to accommodate
1936 the documented boot protocol using a device tree.
1937
1938 Beware that there is very little in terms of protection against
1939 this option being confused by leftover garbage in memory that might
1940 look like a DTB header after a reboot if no actual DTB is appended
1941 to zImage. Do not leave this option active in a production kernel
1942 if you don't intend to always append a DTB. Proper passing of the
1943 location into r2 of a bootloader provided DTB is always preferable
1944 to this option.
1945
1946 config ARM_ATAG_DTB_COMPAT
1947 bool "Supplement the appended DTB with traditional ATAG information"
1948 depends on ARM_APPENDED_DTB
1949 help
1950 Some old bootloaders can't be updated to a DTB capable one, yet
1951 they provide ATAGs with memory configuration, the ramdisk address,
1952 the kernel cmdline string, etc. Such information is dynamically
1953 provided by the bootloader and can't always be stored in a static
1954 DTB. To allow a device tree enabled kernel to be used with such
1955 bootloaders, this option allows zImage to extract the information
1956 from the ATAG list and store it at run time into the appended DTB.
1957
1958 choice
1959 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1960 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1961
1962 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1963 bool "Use bootloader kernel arguments if available"
1964 help
1965 Uses the command-line options passed by the boot loader instead of
1966 the device tree bootargs property. If the boot loader doesn't provide
1967 any, the device tree bootargs property will be used.
1968
1969 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1970 bool "Extend with bootloader kernel arguments"
1971 help
1972 The command-line arguments provided by the boot loader will be
1973 appended to the the device tree bootargs property.
1974
1975 endchoice
1976
1977 config CMDLINE
1978 string "Default kernel command string"
1979 default ""
1980 help
1981 On some architectures (EBSA110 and CATS), there is currently no way
1982 for the boot loader to pass arguments to the kernel. For these
1983 architectures, you should supply some command-line options at build
1984 time by entering them here. As a minimum, you should specify the
1985 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1986
1987 choice
1988 prompt "Kernel command line type" if CMDLINE != ""
1989 default CMDLINE_FROM_BOOTLOADER
1990 depends on ATAGS
1991
1992 config CMDLINE_FROM_BOOTLOADER
1993 bool "Use bootloader kernel arguments if available"
1994 help
1995 Uses the command-line options passed by the boot loader. If
1996 the boot loader doesn't provide any, the default kernel command
1997 string provided in CMDLINE will be used.
1998
1999 config CMDLINE_EXTEND
2000 bool "Extend bootloader kernel arguments"
2001 help
2002 The command-line arguments provided by the boot loader will be
2003 appended to the default kernel command string.
2004
2005 config CMDLINE_FORCE
2006 bool "Always use the default kernel command string"
2007 help
2008 Always use the default kernel command string, even if the boot
2009 loader passes other arguments to the kernel.
2010 This is useful if you cannot or don't want to change the
2011 command-line options your boot loader passes to the kernel.
2012 endchoice
2013
2014 config XIP_KERNEL
2015 bool "Kernel Execute-In-Place from ROM"
2016 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2017 help
2018 Execute-In-Place allows the kernel to run from non-volatile storage
2019 directly addressable by the CPU, such as NOR flash. This saves RAM
2020 space since the text section of the kernel is not loaded from flash
2021 to RAM. Read-write sections, such as the data section and stack,
2022 are still copied to RAM. The XIP kernel is not compressed since
2023 it has to run directly from flash, so it will take more space to
2024 store it. The flash address used to link the kernel object files,
2025 and for storing it, is configuration dependent. Therefore, if you
2026 say Y here, you must know the proper physical address where to
2027 store the kernel image depending on your own flash memory usage.
2028
2029 Also note that the make target becomes "make xipImage" rather than
2030 "make zImage" or "make Image". The final kernel binary to put in
2031 ROM memory will be arch/arm/boot/xipImage.
2032
2033 If unsure, say N.
2034
2035 config XIP_PHYS_ADDR
2036 hex "XIP Kernel Physical Location"
2037 depends on XIP_KERNEL
2038 default "0x00080000"
2039 help
2040 This is the physical address in your flash memory the kernel will
2041 be linked for and stored to. This address is dependent on your
2042 own flash usage.
2043
2044 config KEXEC
2045 bool "Kexec system call (EXPERIMENTAL)"
2046 depends on (!SMP || PM_SLEEP_SMP)
2047 help
2048 kexec is a system call that implements the ability to shutdown your
2049 current kernel, and to start another kernel. It is like a reboot
2050 but it is independent of the system firmware. And like a reboot
2051 you can start any kernel with it, not just Linux.
2052
2053 It is an ongoing process to be certain the hardware in a machine
2054 is properly shutdown, so do not be surprised if this code does not
2055 initially work for you. It may help to enable device hotplugging
2056 support.
2057
2058 config ATAGS_PROC
2059 bool "Export atags in procfs"
2060 depends on ATAGS && KEXEC
2061 default y
2062 help
2063 Should the atags used to boot the kernel be exported in an "atags"
2064 file in procfs. Useful with kexec.
2065
2066 config CRASH_DUMP
2067 bool "Build kdump crash kernel (EXPERIMENTAL)"
2068 help
2069 Generate crash dump after being started by kexec. This should
2070 be normally only set in special crash dump kernels which are
2071 loaded in the main kernel with kexec-tools into a specially
2072 reserved region and then later executed after a crash by
2073 kdump/kexec. The crash dump kernel must be compiled to a
2074 memory address not used by the main kernel
2075
2076 For more details see Documentation/kdump/kdump.txt
2077
2078 config AUTO_ZRELADDR
2079 bool "Auto calculation of the decompressed kernel image address"
2080 depends on !ZBOOT_ROM
2081 help
2082 ZRELADDR is the physical address where the decompressed kernel
2083 image will be placed. If AUTO_ZRELADDR is selected, the address
2084 will be determined at run-time by masking the current IP with
2085 0xf8000000. This assumes the zImage being placed in the first 128MB
2086 from start of memory.
2087
2088 endmenu
2089
2090 menu "CPU Power Management"
2091
2092 if ARCH_HAS_CPUFREQ
2093 source "drivers/cpufreq/Kconfig"
2094 endif
2095
2096 source "drivers/cpuidle/Kconfig"
2097
2098 endmenu
2099
2100 menu "Floating point emulation"
2101
2102 comment "At least one emulation must be selected"
2103
2104 config FPE_NWFPE
2105 bool "NWFPE math emulation"
2106 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2107 ---help---
2108 Say Y to include the NWFPE floating point emulator in the kernel.
2109 This is necessary to run most binaries. Linux does not currently
2110 support floating point hardware so you need to say Y here even if
2111 your machine has an FPA or floating point co-processor podule.
2112
2113 You may say N here if you are going to load the Acorn FPEmulator
2114 early in the bootup.
2115
2116 config FPE_NWFPE_XP
2117 bool "Support extended precision"
2118 depends on FPE_NWFPE
2119 help
2120 Say Y to include 80-bit support in the kernel floating-point
2121 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2122 Note that gcc does not generate 80-bit operations by default,
2123 so in most cases this option only enlarges the size of the
2124 floating point emulator without any good reason.
2125
2126 You almost surely want to say N here.
2127
2128 config FPE_FASTFPE
2129 bool "FastFPE math emulation (EXPERIMENTAL)"
2130 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2131 ---help---
2132 Say Y here to include the FAST floating point emulator in the kernel.
2133 This is an experimental much faster emulator which now also has full
2134 precision for the mantissa. It does not support any exceptions.
2135 It is very simple, and approximately 3-6 times faster than NWFPE.
2136
2137 It should be sufficient for most programs. It may be not suitable
2138 for scientific calculations, but you have to check this for yourself.
2139 If you do not feel you need a faster FP emulation you should better
2140 choose NWFPE.
2141
2142 config VFP
2143 bool "VFP-format floating point maths"
2144 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2145 help
2146 Say Y to include VFP support code in the kernel. This is needed
2147 if your hardware includes a VFP unit.
2148
2149 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2150 release notes and additional status information.
2151
2152 Say N if your target does not have VFP hardware.
2153
2154 config VFPv3
2155 bool
2156 depends on VFP
2157 default y if CPU_V7
2158
2159 config NEON
2160 bool "Advanced SIMD (NEON) Extension support"
2161 depends on VFPv3 && CPU_V7
2162 help
2163 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2164 Extension.
2165
2166 endmenu
2167
2168 menu "Userspace binary formats"
2169
2170 source "fs/Kconfig.binfmt"
2171
2172 config ARTHUR
2173 tristate "RISC OS personality"
2174 depends on !AEABI
2175 help
2176 Say Y here to include the kernel code necessary if you want to run
2177 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2178 experimental; if this sounds frightening, say N and sleep in peace.
2179 You can also say M here to compile this support as a module (which
2180 will be called arthur).
2181
2182 endmenu
2183
2184 menu "Power management options"
2185
2186 source "kernel/power/Kconfig"
2187
2188 config ARCH_SUSPEND_POSSIBLE
2189 depends on !ARCH_S5PC100
2190 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2191 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2192 def_bool y
2193
2194 config ARM_CPU_SUSPEND
2195 def_bool PM_SLEEP
2196
2197 endmenu
2198
2199 source "net/Kconfig"
2200
2201 source "drivers/Kconfig"
2202
2203 source "fs/Kconfig"
2204
2205 source "arch/arm/Kconfig.debug"
2206
2207 source "security/Kconfig"
2208
2209 source "crypto/Kconfig"
2210
2211 source "lib/Kconfig"
2212
2213 source "arch/arm/kvm/Kconfig"
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