xref: /openbmc/linux/arch/arm/Kconfig (revision f5005f78)
1config ARM
2	bool
3	default y
4	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
5	select ARCH_HAS_ELF_RANDOMIZE
6	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
7	select ARCH_HAVE_CUSTOM_GPIO_H
8	select ARCH_HAS_GCOV_PROFILE_ALL
9	select ARCH_MIGHT_HAVE_PC_PARPORT
10	select ARCH_SUPPORTS_ATOMIC_RMW
11	select ARCH_USE_BUILTIN_BSWAP
12	select ARCH_USE_CMPXCHG_LOCKREF
13	select ARCH_WANT_IPC_PARSE_VERSION
14	select BUILDTIME_EXTABLE_SORT if MMU
15	select CLONE_BACKWARDS
16	select CPU_PM if (SUSPEND || CPU_IDLE)
17	select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
18	select EDAC_SUPPORT
19	select EDAC_ATOMIC_SCRUB
20	select GENERIC_ALLOCATOR
21	select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
22	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
23	select GENERIC_IDLE_POLL_SETUP
24	select GENERIC_IRQ_PROBE
25	select GENERIC_IRQ_SHOW
26	select GENERIC_IRQ_SHOW_LEVEL
27	select GENERIC_PCI_IOMAP
28	select GENERIC_SCHED_CLOCK
29	select GENERIC_SMP_IDLE_THREAD
30	select GENERIC_STRNCPY_FROM_USER
31	select GENERIC_STRNLEN_USER
32	select HANDLE_DOMAIN_IRQ
33	select HARDIRQS_SW_RESEND
34	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
35	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
36	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32
37	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32
38	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
39	select HAVE_ARCH_TRACEHOOK
40	select HAVE_BPF_JIT
41	select HAVE_CC_STACKPROTECTOR
42	select HAVE_CONTEXT_TRACKING
43	select HAVE_C_RECORDMCOUNT
44	select HAVE_DEBUG_KMEMLEAK
45	select HAVE_DMA_API_DEBUG
46	select HAVE_DMA_ATTRS
47	select HAVE_DMA_CONTIGUOUS if MMU
48	select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32
49	select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
50	select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
51	select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
52	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
53	select HAVE_GENERIC_DMA_COHERENT
54	select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
55	select HAVE_IDE if PCI || ISA || PCMCIA
56	select HAVE_IRQ_TIME_ACCOUNTING
57	select HAVE_KERNEL_GZIP
58	select HAVE_KERNEL_LZ4
59	select HAVE_KERNEL_LZMA
60	select HAVE_KERNEL_LZO
61	select HAVE_KERNEL_XZ
62	select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
63	select HAVE_KRETPROBES if (HAVE_KPROBES)
64	select HAVE_MEMBLOCK
65	select HAVE_MOD_ARCH_SPECIFIC
66	select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
67	select HAVE_OPTPROBES if !THUMB2_KERNEL
68	select HAVE_PERF_EVENTS
69	select HAVE_PERF_REGS
70	select HAVE_PERF_USER_STACK_DUMP
71	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
72	select HAVE_REGS_AND_STACK_ACCESS_API
73	select HAVE_SYSCALL_TRACEPOINTS
74	select HAVE_UID16
75	select HAVE_VIRT_CPU_ACCOUNTING_GEN
76	select IRQ_FORCED_THREADING
77	select MODULES_USE_ELF_REL
78	select NO_BOOTMEM
79	select OLD_SIGACTION
80	select OLD_SIGSUSPEND3
81	select PERF_USE_VMALLOC
82	select RTC_LIB
83	select SYS_SUPPORTS_APM_EMULATION
84	# Above selects are sorted alphabetically; please add new ones
85	# according to that.  Thanks.
86	help
87	  The ARM series is a line of low-power-consumption RISC chip designs
88	  licensed by ARM Ltd and targeted at embedded applications and
89	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
90	  manufactured, but legacy ARM-based PC hardware remains popular in
91	  Europe.  There is an ARM Linux project with a web page at
92	  <http://www.arm.linux.org.uk/>.
93
94config ARM_HAS_SG_CHAIN
95	select ARCH_HAS_SG_CHAIN
96	bool
97
98config NEED_SG_DMA_LENGTH
99	bool
100
101config ARM_DMA_USE_IOMMU
102	bool
103	select ARM_HAS_SG_CHAIN
104	select NEED_SG_DMA_LENGTH
105
106if ARM_DMA_USE_IOMMU
107
108config ARM_DMA_IOMMU_ALIGNMENT
109	int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
110	range 4 9
111	default 8
112	help
113	  DMA mapping framework by default aligns all buffers to the smallest
114	  PAGE_SIZE order which is greater than or equal to the requested buffer
115	  size. This works well for buffers up to a few hundreds kilobytes, but
116	  for larger buffers it just a waste of address space. Drivers which has
117	  relatively small addressing window (like 64Mib) might run out of
118	  virtual space with just a few allocations.
119
120	  With this parameter you can specify the maximum PAGE_SIZE order for
121	  DMA IOMMU buffers. Larger buffers will be aligned only to this
122	  specified order. The order is expressed as a power of two multiplied
123	  by the PAGE_SIZE.
124
125endif
126
127config MIGHT_HAVE_PCI
128	bool
129
130config SYS_SUPPORTS_APM_EMULATION
131	bool
132
133config HAVE_TCM
134	bool
135	select GENERIC_ALLOCATOR
136
137config HAVE_PROC_CPU
138	bool
139
140config NO_IOPORT_MAP
141	bool
142
143config EISA
144	bool
145	---help---
146	  The Extended Industry Standard Architecture (EISA) bus was
147	  developed as an open alternative to the IBM MicroChannel bus.
148
149	  The EISA bus provided some of the features of the IBM MicroChannel
150	  bus while maintaining backward compatibility with cards made for
151	  the older ISA bus.  The EISA bus saw limited use between 1988 and
152	  1995 when it was made obsolete by the PCI bus.
153
154	  Say Y here if you are building a kernel for an EISA-based machine.
155
156	  Otherwise, say N.
157
158config SBUS
159	bool
160
161config STACKTRACE_SUPPORT
162	bool
163	default y
164
165config HAVE_LATENCYTOP_SUPPORT
166	bool
167	depends on !SMP
168	default y
169
170config LOCKDEP_SUPPORT
171	bool
172	default y
173
174config TRACE_IRQFLAGS_SUPPORT
175	bool
176	default !CPU_V7M
177
178config RWSEM_XCHGADD_ALGORITHM
179	bool
180	default y
181
182config ARCH_HAS_ILOG2_U32
183	bool
184
185config ARCH_HAS_ILOG2_U64
186	bool
187
188config ARCH_HAS_BANDGAP
189	bool
190
191config GENERIC_HWEIGHT
192	bool
193	default y
194
195config GENERIC_CALIBRATE_DELAY
196	bool
197	default y
198
199config ARCH_MAY_HAVE_PC_FDC
200	bool
201
202config ZONE_DMA
203	bool
204
205config NEED_DMA_MAP_STATE
206       def_bool y
207
208config ARCH_SUPPORTS_UPROBES
209	def_bool y
210
211config ARCH_HAS_DMA_SET_COHERENT_MASK
212	bool
213
214config GENERIC_ISA_DMA
215	bool
216
217config FIQ
218	bool
219
220config NEED_RET_TO_USER
221	bool
222
223config ARCH_MTD_XIP
224	bool
225
226config VECTORS_BASE
227	hex
228	default 0xffff0000 if MMU || CPU_HIGH_VECTOR
229	default DRAM_BASE if REMAP_VECTORS_TO_RAM
230	default 0x00000000
231	help
232	  The base address of exception vectors.  This must be two pages
233	  in size.
234
235config ARM_PATCH_PHYS_VIRT
236	bool "Patch physical to virtual translations at runtime" if EMBEDDED
237	default y
238	depends on !XIP_KERNEL && MMU
239	depends on !ARCH_REALVIEW || !SPARSEMEM
240	help
241	  Patch phys-to-virt and virt-to-phys translation functions at
242	  boot and module load time according to the position of the
243	  kernel in system memory.
244
245	  This can only be used with non-XIP MMU kernels where the base
246	  of physical memory is at a 16MB boundary.
247
248	  Only disable this option if you know that you do not require
249	  this feature (eg, building a kernel for a single machine) and
250	  you need to shrink the kernel to the minimal size.
251
252config NEED_MACH_IO_H
253	bool
254	help
255	  Select this when mach/io.h is required to provide special
256	  definitions for this platform.  The need for mach/io.h should
257	  be avoided when possible.
258
259config NEED_MACH_MEMORY_H
260	bool
261	help
262	  Select this when mach/memory.h is required to provide special
263	  definitions for this platform.  The need for mach/memory.h should
264	  be avoided when possible.
265
266config PHYS_OFFSET
267	hex "Physical address of main memory" if MMU
268	depends on !ARM_PATCH_PHYS_VIRT
269	default DRAM_BASE if !MMU
270	default 0x00000000 if ARCH_EBSA110 || \
271			EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
272			ARCH_FOOTBRIDGE || \
273			ARCH_INTEGRATOR || \
274			ARCH_IOP13XX || \
275			ARCH_KS8695 || \
276			(ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
277	default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
278	default 0x20000000 if ARCH_S5PV210
279	default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
280	default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
281	default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
282	default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
283	default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
284	help
285	  Please provide the physical address corresponding to the
286	  location of main memory in your system.
287
288config GENERIC_BUG
289	def_bool y
290	depends on BUG
291
292config PGTABLE_LEVELS
293	int
294	default 3 if ARM_LPAE
295	default 2
296
297source "init/Kconfig"
298
299source "kernel/Kconfig.freezer"
300
301menu "System Type"
302
303config MMU
304	bool "MMU-based Paged Memory Management Support"
305	default y
306	help
307	  Select if you want MMU-based virtualised addressing space
308	  support by paged memory management. If unsure, say 'Y'.
309
310#
311# The "ARM system type" choice list is ordered alphabetically by option
312# text.  Please add new entries in the option alphabetic order.
313#
314choice
315	prompt "ARM system type"
316	default ARCH_VERSATILE if !MMU
317	default ARCH_MULTIPLATFORM if MMU
318
319config ARCH_MULTIPLATFORM
320	bool "Allow multiple platforms to be selected"
321	depends on MMU
322	select ARCH_WANT_OPTIONAL_GPIOLIB
323	select ARM_HAS_SG_CHAIN
324	select ARM_PATCH_PHYS_VIRT
325	select AUTO_ZRELADDR
326	select CLKSRC_OF
327	select COMMON_CLK
328	select GENERIC_CLOCKEVENTS
329	select MIGHT_HAVE_PCI
330	select MULTI_IRQ_HANDLER
331	select SPARSE_IRQ
332	select USE_OF
333
334config ARM_SINGLE_ARMV7M
335	bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
336	depends on !MMU
337	select ARCH_WANT_OPTIONAL_GPIOLIB
338	select ARM_NVIC
339	select AUTO_ZRELADDR
340	select CLKSRC_OF
341	select COMMON_CLK
342	select CPU_V7M
343	select GENERIC_CLOCKEVENTS
344	select NO_IOPORT_MAP
345	select SPARSE_IRQ
346	select USE_OF
347
348config ARCH_REALVIEW
349	bool "ARM Ltd. RealView family"
350	select ARCH_WANT_OPTIONAL_GPIOLIB
351	select ARM_AMBA
352	select ARM_TIMER_SP804
353	select COMMON_CLK
354	select COMMON_CLK_VERSATILE
355	select GENERIC_CLOCKEVENTS
356	select GPIO_PL061 if GPIOLIB
357	select ICST
358	select NEED_MACH_MEMORY_H
359	select PLAT_VERSATILE
360	select PLAT_VERSATILE_SCHED_CLOCK
361	help
362	  This enables support for ARM Ltd RealView boards.
363
364config ARCH_VERSATILE
365	bool "ARM Ltd. Versatile family"
366	select ARCH_WANT_OPTIONAL_GPIOLIB
367	select ARM_AMBA
368	select ARM_TIMER_SP804
369	select ARM_VIC
370	select CLKDEV_LOOKUP
371	select GENERIC_CLOCKEVENTS
372	select HAVE_MACH_CLKDEV
373	select ICST
374	select PLAT_VERSATILE
375	select PLAT_VERSATILE_CLOCK
376	select PLAT_VERSATILE_SCHED_CLOCK
377	select VERSATILE_FPGA_IRQ
378	help
379	  This enables support for ARM Ltd Versatile board.
380
381config ARCH_CLPS711X
382	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
383	select ARCH_REQUIRE_GPIOLIB
384	select AUTO_ZRELADDR
385	select CLKSRC_MMIO
386	select COMMON_CLK
387	select CPU_ARM720T
388	select GENERIC_CLOCKEVENTS
389	select MFD_SYSCON
390	select SOC_BUS
391	help
392	  Support for Cirrus Logic 711x/721x/731x based boards.
393
394config ARCH_GEMINI
395	bool "Cortina Systems Gemini"
396	select ARCH_REQUIRE_GPIOLIB
397	select CLKSRC_MMIO
398	select CPU_FA526
399	select GENERIC_CLOCKEVENTS
400	help
401	  Support for the Cortina Systems Gemini family SoCs
402
403config ARCH_EBSA110
404	bool "EBSA-110"
405	select ARCH_USES_GETTIMEOFFSET
406	select CPU_SA110
407	select ISA
408	select NEED_MACH_IO_H
409	select NEED_MACH_MEMORY_H
410	select NO_IOPORT_MAP
411	help
412	  This is an evaluation board for the StrongARM processor available
413	  from Digital. It has limited hardware on-board, including an
414	  Ethernet interface, two PCMCIA sockets, two serial ports and a
415	  parallel port.
416
417config ARCH_EP93XX
418	bool "EP93xx-based"
419	select ARCH_HAS_HOLES_MEMORYMODEL
420	select ARCH_REQUIRE_GPIOLIB
421	select ARCH_USES_GETTIMEOFFSET
422	select ARM_AMBA
423	select ARM_VIC
424	select CLKDEV_LOOKUP
425	select CPU_ARM920T
426	help
427	  This enables support for the Cirrus EP93xx series of CPUs.
428
429config ARCH_FOOTBRIDGE
430	bool "FootBridge"
431	select CPU_SA110
432	select FOOTBRIDGE
433	select GENERIC_CLOCKEVENTS
434	select HAVE_IDE
435	select NEED_MACH_IO_H if !MMU
436	select NEED_MACH_MEMORY_H
437	help
438	  Support for systems based on the DC21285 companion chip
439	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
440
441config ARCH_NETX
442	bool "Hilscher NetX based"
443	select ARM_VIC
444	select CLKSRC_MMIO
445	select CPU_ARM926T
446	select GENERIC_CLOCKEVENTS
447	help
448	  This enables support for systems based on the Hilscher NetX Soc
449
450config ARCH_IOP13XX
451	bool "IOP13xx-based"
452	depends on MMU
453	select CPU_XSC3
454	select NEED_MACH_MEMORY_H
455	select NEED_RET_TO_USER
456	select PCI
457	select PLAT_IOP
458	select VMSPLIT_1G
459	select SPARSE_IRQ
460	help
461	  Support for Intel's IOP13XX (XScale) family of processors.
462
463config ARCH_IOP32X
464	bool "IOP32x-based"
465	depends on MMU
466	select ARCH_REQUIRE_GPIOLIB
467	select CPU_XSCALE
468	select GPIO_IOP
469	select NEED_RET_TO_USER
470	select PCI
471	select PLAT_IOP
472	help
473	  Support for Intel's 80219 and IOP32X (XScale) family of
474	  processors.
475
476config ARCH_IOP33X
477	bool "IOP33x-based"
478	depends on MMU
479	select ARCH_REQUIRE_GPIOLIB
480	select CPU_XSCALE
481	select GPIO_IOP
482	select NEED_RET_TO_USER
483	select PCI
484	select PLAT_IOP
485	help
486	  Support for Intel's IOP33X (XScale) family of processors.
487
488config ARCH_IXP4XX
489	bool "IXP4xx-based"
490	depends on MMU
491	select ARCH_HAS_DMA_SET_COHERENT_MASK
492	select ARCH_REQUIRE_GPIOLIB
493	select ARCH_SUPPORTS_BIG_ENDIAN
494	select CLKSRC_MMIO
495	select CPU_XSCALE
496	select DMABOUNCE if PCI
497	select GENERIC_CLOCKEVENTS
498	select MIGHT_HAVE_PCI
499	select NEED_MACH_IO_H
500	select USB_EHCI_BIG_ENDIAN_DESC
501	select USB_EHCI_BIG_ENDIAN_MMIO
502	help
503	  Support for Intel's IXP4XX (XScale) family of processors.
504
505config ARCH_DOVE
506	bool "Marvell Dove"
507	select ARCH_REQUIRE_GPIOLIB
508	select CPU_PJ4
509	select GENERIC_CLOCKEVENTS
510	select MIGHT_HAVE_PCI
511	select MVEBU_MBUS
512	select PINCTRL
513	select PINCTRL_DOVE
514	select PLAT_ORION_LEGACY
515	help
516	  Support for the Marvell Dove SoC 88AP510
517
518config ARCH_MV78XX0
519	bool "Marvell MV78xx0"
520	select ARCH_REQUIRE_GPIOLIB
521	select CPU_FEROCEON
522	select GENERIC_CLOCKEVENTS
523	select MVEBU_MBUS
524	select PCI
525	select PLAT_ORION_LEGACY
526	help
527	  Support for the following Marvell MV78xx0 series SoCs:
528	  MV781x0, MV782x0.
529
530config ARCH_ORION5X
531	bool "Marvell Orion"
532	depends on MMU
533	select ARCH_REQUIRE_GPIOLIB
534	select CPU_FEROCEON
535	select GENERIC_CLOCKEVENTS
536	select MVEBU_MBUS
537	select PCI
538	select PLAT_ORION_LEGACY
539	help
540	  Support for the following Marvell Orion 5x series SoCs:
541	  Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
542	  Orion-2 (5281), Orion-1-90 (6183).
543
544config ARCH_MMP
545	bool "Marvell PXA168/910/MMP2"
546	depends on MMU
547	select ARCH_REQUIRE_GPIOLIB
548	select CLKDEV_LOOKUP
549	select GENERIC_ALLOCATOR
550	select GENERIC_CLOCKEVENTS
551	select GPIO_PXA
552	select IRQ_DOMAIN
553	select MULTI_IRQ_HANDLER
554	select PINCTRL
555	select PLAT_PXA
556	select SPARSE_IRQ
557	help
558	  Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
559
560config ARCH_KS8695
561	bool "Micrel/Kendin KS8695"
562	select ARCH_REQUIRE_GPIOLIB
563	select CLKSRC_MMIO
564	select CPU_ARM922T
565	select GENERIC_CLOCKEVENTS
566	select NEED_MACH_MEMORY_H
567	help
568	  Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
569	  System-on-Chip devices.
570
571config ARCH_W90X900
572	bool "Nuvoton W90X900 CPU"
573	select ARCH_REQUIRE_GPIOLIB
574	select CLKDEV_LOOKUP
575	select CLKSRC_MMIO
576	select CPU_ARM926T
577	select GENERIC_CLOCKEVENTS
578	help
579	  Support for Nuvoton (Winbond logic dept.) ARM9 processor,
580	  At present, the w90x900 has been renamed nuc900, regarding
581	  the ARM series product line, you can login the following
582	  link address to know more.
583
584	  <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
585		ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
586
587config ARCH_LPC32XX
588	bool "NXP LPC32XX"
589	select ARCH_REQUIRE_GPIOLIB
590	select ARM_AMBA
591	select CLKDEV_LOOKUP
592	select CLKSRC_MMIO
593	select CPU_ARM926T
594	select GENERIC_CLOCKEVENTS
595	select HAVE_IDE
596	select USE_OF
597	help
598	  Support for the NXP LPC32XX family of processors
599
600config ARCH_PXA
601	bool "PXA2xx/PXA3xx-based"
602	depends on MMU
603	select ARCH_MTD_XIP
604	select ARCH_REQUIRE_GPIOLIB
605	select ARM_CPU_SUSPEND if PM
606	select AUTO_ZRELADDR
607	select COMMON_CLK
608	select CLKDEV_LOOKUP
609	select CLKSRC_MMIO
610	select CLKSRC_OF
611	select GENERIC_CLOCKEVENTS
612	select GPIO_PXA
613	select HAVE_IDE
614	select IRQ_DOMAIN
615	select MULTI_IRQ_HANDLER
616	select PLAT_PXA
617	select SPARSE_IRQ
618	help
619	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
620
621config ARCH_SHMOBILE_LEGACY
622	bool "Renesas ARM SoCs (non-multiplatform)"
623	select ARCH_SHMOBILE
624	select ARM_PATCH_PHYS_VIRT if MMU
625	select CLKDEV_LOOKUP
626	select CPU_V7
627	select GENERIC_CLOCKEVENTS
628	select HAVE_ARM_SCU if SMP
629	select HAVE_ARM_TWD if SMP
630	select HAVE_SMP
631	select MIGHT_HAVE_CACHE_L2X0
632	select MULTI_IRQ_HANDLER
633	select NO_IOPORT_MAP
634	select PINCTRL
635	select PM_GENERIC_DOMAINS if PM
636	select SH_CLK_CPG
637	select SPARSE_IRQ
638	help
639	  Support for Renesas ARM SoC platforms using a non-multiplatform
640	  kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
641	  and RZ families.
642
643config ARCH_RPC
644	bool "RiscPC"
645	select ARCH_ACORN
646	select ARCH_MAY_HAVE_PC_FDC
647	select ARCH_SPARSEMEM_ENABLE
648	select ARCH_USES_GETTIMEOFFSET
649	select CPU_SA110
650	select FIQ
651	select HAVE_IDE
652	select HAVE_PATA_PLATFORM
653	select ISA_DMA_API
654	select NEED_MACH_IO_H
655	select NEED_MACH_MEMORY_H
656	select NO_IOPORT_MAP
657	select VIRT_TO_BUS
658	help
659	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
660	  CD-ROM interface, serial and parallel port, and the floppy drive.
661
662config ARCH_SA1100
663	bool "SA1100-based"
664	select ARCH_MTD_XIP
665	select ARCH_REQUIRE_GPIOLIB
666	select ARCH_SPARSEMEM_ENABLE
667	select CLKDEV_LOOKUP
668	select CLKSRC_MMIO
669	select CPU_FREQ
670	select CPU_SA1100
671	select GENERIC_CLOCKEVENTS
672	select HAVE_IDE
673	select IRQ_DOMAIN
674	select ISA
675	select MULTI_IRQ_HANDLER
676	select NEED_MACH_MEMORY_H
677	select SPARSE_IRQ
678	help
679	  Support for StrongARM 11x0 based boards.
680
681config ARCH_S3C24XX
682	bool "Samsung S3C24XX SoCs"
683	select ARCH_REQUIRE_GPIOLIB
684	select ATAGS
685	select CLKDEV_LOOKUP
686	select CLKSRC_SAMSUNG_PWM
687	select GENERIC_CLOCKEVENTS
688	select GPIO_SAMSUNG
689	select HAVE_S3C2410_I2C if I2C
690	select HAVE_S3C2410_WATCHDOG if WATCHDOG
691	select HAVE_S3C_RTC if RTC_CLASS
692	select MULTI_IRQ_HANDLER
693	select NEED_MACH_IO_H
694	select SAMSUNG_ATAGS
695	help
696	  Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
697	  and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
698	  (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
699	  Samsung SMDK2410 development board (and derivatives).
700
701config ARCH_S3C64XX
702	bool "Samsung S3C64XX"
703	select ARCH_REQUIRE_GPIOLIB
704	select ARM_AMBA
705	select ARM_VIC
706	select ATAGS
707	select CLKDEV_LOOKUP
708	select CLKSRC_SAMSUNG_PWM
709	select COMMON_CLK_SAMSUNG
710	select CPU_V6K
711	select GENERIC_CLOCKEVENTS
712	select GPIO_SAMSUNG
713	select HAVE_S3C2410_I2C if I2C
714	select HAVE_S3C2410_WATCHDOG if WATCHDOG
715	select HAVE_TCM
716	select NO_IOPORT_MAP
717	select PLAT_SAMSUNG
718	select PM_GENERIC_DOMAINS if PM
719	select S3C_DEV_NAND
720	select S3C_GPIO_TRACK
721	select SAMSUNG_ATAGS
722	select SAMSUNG_WAKEMASK
723	select SAMSUNG_WDT_RESET
724	help
725	  Samsung S3C64XX series based systems
726
727config ARCH_DAVINCI
728	bool "TI DaVinci"
729	select ARCH_HAS_HOLES_MEMORYMODEL
730	select ARCH_REQUIRE_GPIOLIB
731	select CLKDEV_LOOKUP
732	select GENERIC_ALLOCATOR
733	select GENERIC_CLOCKEVENTS
734	select GENERIC_IRQ_CHIP
735	select HAVE_IDE
736	select TI_PRIV_EDMA
737	select USE_OF
738	select ZONE_DMA
739	help
740	  Support for TI's DaVinci platform.
741
742config ARCH_OMAP1
743	bool "TI OMAP1"
744	depends on MMU
745	select ARCH_HAS_HOLES_MEMORYMODEL
746	select ARCH_OMAP
747	select ARCH_REQUIRE_GPIOLIB
748	select CLKDEV_LOOKUP
749	select CLKSRC_MMIO
750	select GENERIC_CLOCKEVENTS
751	select GENERIC_IRQ_CHIP
752	select HAVE_IDE
753	select IRQ_DOMAIN
754	select MULTI_IRQ_HANDLER
755	select NEED_MACH_IO_H if PCCARD
756	select NEED_MACH_MEMORY_H
757	select SPARSE_IRQ
758	help
759	  Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
760
761endchoice
762
763menu "Multiple platform selection"
764	depends on ARCH_MULTIPLATFORM
765
766comment "CPU Core family selection"
767
768config ARCH_MULTI_V4
769	bool "ARMv4 based platforms (FA526)"
770	depends on !ARCH_MULTI_V6_V7
771	select ARCH_MULTI_V4_V5
772	select CPU_FA526
773
774config ARCH_MULTI_V4T
775	bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
776	depends on !ARCH_MULTI_V6_V7
777	select ARCH_MULTI_V4_V5
778	select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
779		CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
780		CPU_ARM925T || CPU_ARM940T)
781
782config ARCH_MULTI_V5
783	bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
784	depends on !ARCH_MULTI_V6_V7
785	select ARCH_MULTI_V4_V5
786	select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
787		CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
788		CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
789
790config ARCH_MULTI_V4_V5
791	bool
792
793config ARCH_MULTI_V6
794	bool "ARMv6 based platforms (ARM11)"
795	select ARCH_MULTI_V6_V7
796	select CPU_V6K
797
798config ARCH_MULTI_V7
799	bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
800	default y
801	select ARCH_MULTI_V6_V7
802	select CPU_V7
803	select HAVE_SMP
804
805config ARCH_MULTI_V6_V7
806	bool
807	select MIGHT_HAVE_CACHE_L2X0
808
809config ARCH_MULTI_CPU_AUTO
810	def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
811	select ARCH_MULTI_V5
812
813endmenu
814
815config ARCH_VIRT
816	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
817	select ARM_AMBA
818	select ARM_GIC
819	select ARM_PSCI
820	select HAVE_ARM_ARCH_TIMER
821
822#
823# This is sorted alphabetically by mach-* pathname.  However, plat-*
824# Kconfigs may be included either alphabetically (according to the
825# plat- suffix) or along side the corresponding mach-* source.
826#
827source "arch/arm/mach-mvebu/Kconfig"
828
829source "arch/arm/mach-alpine/Kconfig"
830
831source "arch/arm/mach-asm9260/Kconfig"
832
833source "arch/arm/mach-at91/Kconfig"
834
835source "arch/arm/mach-axxia/Kconfig"
836
837source "arch/arm/mach-bcm/Kconfig"
838
839source "arch/arm/mach-berlin/Kconfig"
840
841source "arch/arm/mach-clps711x/Kconfig"
842
843source "arch/arm/mach-cns3xxx/Kconfig"
844
845source "arch/arm/mach-davinci/Kconfig"
846
847source "arch/arm/mach-digicolor/Kconfig"
848
849source "arch/arm/mach-dove/Kconfig"
850
851source "arch/arm/mach-ep93xx/Kconfig"
852
853source "arch/arm/mach-footbridge/Kconfig"
854
855source "arch/arm/mach-gemini/Kconfig"
856
857source "arch/arm/mach-highbank/Kconfig"
858
859source "arch/arm/mach-hisi/Kconfig"
860
861source "arch/arm/mach-integrator/Kconfig"
862
863source "arch/arm/mach-iop32x/Kconfig"
864
865source "arch/arm/mach-iop33x/Kconfig"
866
867source "arch/arm/mach-iop13xx/Kconfig"
868
869source "arch/arm/mach-ixp4xx/Kconfig"
870
871source "arch/arm/mach-keystone/Kconfig"
872
873source "arch/arm/mach-ks8695/Kconfig"
874
875source "arch/arm/mach-meson/Kconfig"
876
877source "arch/arm/mach-moxart/Kconfig"
878
879source "arch/arm/mach-mv78xx0/Kconfig"
880
881source "arch/arm/mach-imx/Kconfig"
882
883source "arch/arm/mach-mediatek/Kconfig"
884
885source "arch/arm/mach-mxs/Kconfig"
886
887source "arch/arm/mach-netx/Kconfig"
888
889source "arch/arm/mach-nomadik/Kconfig"
890
891source "arch/arm/mach-nspire/Kconfig"
892
893source "arch/arm/plat-omap/Kconfig"
894
895source "arch/arm/mach-omap1/Kconfig"
896
897source "arch/arm/mach-omap2/Kconfig"
898
899source "arch/arm/mach-orion5x/Kconfig"
900
901source "arch/arm/mach-picoxcell/Kconfig"
902
903source "arch/arm/mach-pxa/Kconfig"
904source "arch/arm/plat-pxa/Kconfig"
905
906source "arch/arm/mach-mmp/Kconfig"
907
908source "arch/arm/mach-qcom/Kconfig"
909
910source "arch/arm/mach-realview/Kconfig"
911
912source "arch/arm/mach-rockchip/Kconfig"
913
914source "arch/arm/mach-sa1100/Kconfig"
915
916source "arch/arm/mach-socfpga/Kconfig"
917
918source "arch/arm/mach-spear/Kconfig"
919
920source "arch/arm/mach-sti/Kconfig"
921
922source "arch/arm/mach-s3c24xx/Kconfig"
923
924source "arch/arm/mach-s3c64xx/Kconfig"
925
926source "arch/arm/mach-s5pv210/Kconfig"
927
928source "arch/arm/mach-exynos/Kconfig"
929source "arch/arm/plat-samsung/Kconfig"
930
931source "arch/arm/mach-shmobile/Kconfig"
932
933source "arch/arm/mach-sunxi/Kconfig"
934
935source "arch/arm/mach-prima2/Kconfig"
936
937source "arch/arm/mach-tegra/Kconfig"
938
939source "arch/arm/mach-u300/Kconfig"
940
941source "arch/arm/mach-uniphier/Kconfig"
942
943source "arch/arm/mach-ux500/Kconfig"
944
945source "arch/arm/mach-versatile/Kconfig"
946
947source "arch/arm/mach-vexpress/Kconfig"
948source "arch/arm/plat-versatile/Kconfig"
949
950source "arch/arm/mach-vt8500/Kconfig"
951
952source "arch/arm/mach-w90x900/Kconfig"
953
954source "arch/arm/mach-zx/Kconfig"
955
956source "arch/arm/mach-zynq/Kconfig"
957
958# ARMv7-M architecture
959config ARCH_EFM32
960	bool "Energy Micro efm32"
961	depends on ARM_SINGLE_ARMV7M
962	select ARCH_REQUIRE_GPIOLIB
963	help
964	  Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
965	  processors.
966
967config ARCH_LPC18XX
968	bool "NXP LPC18xx/LPC43xx"
969	depends on ARM_SINGLE_ARMV7M
970	select ARCH_HAS_RESET_CONTROLLER
971	select ARM_AMBA
972	select CLKSRC_LPC32XX
973	select PINCTRL
974	help
975	  Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
976	  high performance microcontrollers.
977
978config ARCH_STM32
979	bool "STMicrolectronics STM32"
980	depends on ARM_SINGLE_ARMV7M
981	select ARCH_HAS_RESET_CONTROLLER
982	select ARMV7M_SYSTICK
983	select CLKSRC_STM32
984	select RESET_CONTROLLER
985	help
986	  Support for STMicroelectronics STM32 processors.
987
988# Definitions to make life easier
989config ARCH_ACORN
990	bool
991
992config PLAT_IOP
993	bool
994	select GENERIC_CLOCKEVENTS
995
996config PLAT_ORION
997	bool
998	select CLKSRC_MMIO
999	select COMMON_CLK
1000	select GENERIC_IRQ_CHIP
1001	select IRQ_DOMAIN
1002
1003config PLAT_ORION_LEGACY
1004	bool
1005	select PLAT_ORION
1006
1007config PLAT_PXA
1008	bool
1009
1010config PLAT_VERSATILE
1011	bool
1012
1013source "arch/arm/firmware/Kconfig"
1014
1015source arch/arm/mm/Kconfig
1016
1017config IWMMXT
1018	bool "Enable iWMMXt support"
1019	depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1020	default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1021	help
1022	  Enable support for iWMMXt context switching at run time if
1023	  running on a CPU that supports it.
1024
1025config MULTI_IRQ_HANDLER
1026	bool
1027	help
1028	  Allow each machine to specify it's own IRQ handler at run time.
1029
1030if !MMU
1031source "arch/arm/Kconfig-nommu"
1032endif
1033
1034config PJ4B_ERRATA_4742
1035	bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1036	depends on CPU_PJ4B && MACH_ARMADA_370
1037	default y
1038	help
1039	  When coming out of either a Wait for Interrupt (WFI) or a Wait for
1040	  Event (WFE) IDLE states, a specific timing sensitivity exists between
1041	  the retiring WFI/WFE instructions and the newly issued subsequent
1042	  instructions.  This sensitivity can result in a CPU hang scenario.
1043	  Workaround:
1044	  The software must insert either a Data Synchronization Barrier (DSB)
1045	  or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1046	  instruction
1047
1048config ARM_ERRATA_326103
1049	bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1050	depends on CPU_V6
1051	help
1052	  Executing a SWP instruction to read-only memory does not set bit 11
1053	  of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1054	  treat the access as a read, preventing a COW from occurring and
1055	  causing the faulting task to livelock.
1056
1057config ARM_ERRATA_411920
1058	bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1059	depends on CPU_V6 || CPU_V6K
1060	help
1061	  Invalidation of the Instruction Cache operation can
1062	  fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1063	  It does not affect the MPCore. This option enables the ARM Ltd.
1064	  recommended workaround.
1065
1066config ARM_ERRATA_430973
1067	bool "ARM errata: Stale prediction on replaced interworking branch"
1068	depends on CPU_V7
1069	help
1070	  This option enables the workaround for the 430973 Cortex-A8
1071	  r1p* erratum. If a code sequence containing an ARM/Thumb
1072	  interworking branch is replaced with another code sequence at the
1073	  same virtual address, whether due to self-modifying code or virtual
1074	  to physical address re-mapping, Cortex-A8 does not recover from the
1075	  stale interworking branch prediction. This results in Cortex-A8
1076	  executing the new code sequence in the incorrect ARM or Thumb state.
1077	  The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1078	  and also flushes the branch target cache at every context switch.
1079	  Note that setting specific bits in the ACTLR register may not be
1080	  available in non-secure mode.
1081
1082config ARM_ERRATA_458693
1083	bool "ARM errata: Processor deadlock when a false hazard is created"
1084	depends on CPU_V7
1085	depends on !ARCH_MULTIPLATFORM
1086	help
1087	  This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1088	  erratum. For very specific sequences of memory operations, it is
1089	  possible for a hazard condition intended for a cache line to instead
1090	  be incorrectly associated with a different cache line. This false
1091	  hazard might then cause a processor deadlock. The workaround enables
1092	  the L1 caching of the NEON accesses and disables the PLD instruction
1093	  in the ACTLR register. Note that setting specific bits in the ACTLR
1094	  register may not be available in non-secure mode.
1095
1096config ARM_ERRATA_460075
1097	bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1098	depends on CPU_V7
1099	depends on !ARCH_MULTIPLATFORM
1100	help
1101	  This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1102	  erratum. Any asynchronous access to the L2 cache may encounter a
1103	  situation in which recent store transactions to the L2 cache are lost
1104	  and overwritten with stale memory contents from external memory. The
1105	  workaround disables the write-allocate mode for the L2 cache via the
1106	  ACTLR register. Note that setting specific bits in the ACTLR register
1107	  may not be available in non-secure mode.
1108
1109config ARM_ERRATA_742230
1110	bool "ARM errata: DMB operation may be faulty"
1111	depends on CPU_V7 && SMP
1112	depends on !ARCH_MULTIPLATFORM
1113	help
1114	  This option enables the workaround for the 742230 Cortex-A9
1115	  (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1116	  between two write operations may not ensure the correct visibility
1117	  ordering of the two writes. This workaround sets a specific bit in
1118	  the diagnostic register of the Cortex-A9 which causes the DMB
1119	  instruction to behave as a DSB, ensuring the correct behaviour of
1120	  the two writes.
1121
1122config ARM_ERRATA_742231
1123	bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1124	depends on CPU_V7 && SMP
1125	depends on !ARCH_MULTIPLATFORM
1126	help
1127	  This option enables the workaround for the 742231 Cortex-A9
1128	  (r2p0..r2p2) erratum. Under certain conditions, specific to the
1129	  Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1130	  accessing some data located in the same cache line, may get corrupted
1131	  data due to bad handling of the address hazard when the line gets
1132	  replaced from one of the CPUs at the same time as another CPU is
1133	  accessing it. This workaround sets specific bits in the diagnostic
1134	  register of the Cortex-A9 which reduces the linefill issuing
1135	  capabilities of the processor.
1136
1137config ARM_ERRATA_643719
1138	bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1139	depends on CPU_V7 && SMP
1140	default y
1141	help
1142	  This option enables the workaround for the 643719 Cortex-A9 (prior to
1143	  r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1144	  register returns zero when it should return one. The workaround
1145	  corrects this value, ensuring cache maintenance operations which use
1146	  it behave as intended and avoiding data corruption.
1147
1148config ARM_ERRATA_720789
1149	bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1150	depends on CPU_V7
1151	help
1152	  This option enables the workaround for the 720789 Cortex-A9 (prior to
1153	  r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1154	  broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1155	  As a consequence of this erratum, some TLB entries which should be
1156	  invalidated are not, resulting in an incoherency in the system page
1157	  tables. The workaround changes the TLB flushing routines to invalidate
1158	  entries regardless of the ASID.
1159
1160config ARM_ERRATA_743622
1161	bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1162	depends on CPU_V7
1163	depends on !ARCH_MULTIPLATFORM
1164	help
1165	  This option enables the workaround for the 743622 Cortex-A9
1166	  (r2p*) erratum. Under very rare conditions, a faulty
1167	  optimisation in the Cortex-A9 Store Buffer may lead to data
1168	  corruption. This workaround sets a specific bit in the diagnostic
1169	  register of the Cortex-A9 which disables the Store Buffer
1170	  optimisation, preventing the defect from occurring. This has no
1171	  visible impact on the overall performance or power consumption of the
1172	  processor.
1173
1174config ARM_ERRATA_751472
1175	bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1176	depends on CPU_V7
1177	depends on !ARCH_MULTIPLATFORM
1178	help
1179	  This option enables the workaround for the 751472 Cortex-A9 (prior
1180	  to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1181	  completion of a following broadcasted operation if the second
1182	  operation is received by a CPU before the ICIALLUIS has completed,
1183	  potentially leading to corrupted entries in the cache or TLB.
1184
1185config ARM_ERRATA_754322
1186	bool "ARM errata: possible faulty MMU translations following an ASID switch"
1187	depends on CPU_V7
1188	help
1189	  This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1190	  r3p*) erratum. A speculative memory access may cause a page table walk
1191	  which starts prior to an ASID switch but completes afterwards. This
1192	  can populate the micro-TLB with a stale entry which may be hit with
1193	  the new ASID. This workaround places two dsb instructions in the mm
1194	  switching code so that no page table walks can cross the ASID switch.
1195
1196config ARM_ERRATA_754327
1197	bool "ARM errata: no automatic Store Buffer drain"
1198	depends on CPU_V7 && SMP
1199	help
1200	  This option enables the workaround for the 754327 Cortex-A9 (prior to
1201	  r2p0) erratum. The Store Buffer does not have any automatic draining
1202	  mechanism and therefore a livelock may occur if an external agent
1203	  continuously polls a memory location waiting to observe an update.
1204	  This workaround defines cpu_relax() as smp_mb(), preventing correctly
1205	  written polling loops from denying visibility of updates to memory.
1206
1207config ARM_ERRATA_364296
1208	bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1209	depends on CPU_V6
1210	help
1211	  This options enables the workaround for the 364296 ARM1136
1212	  r0p2 erratum (possible cache data corruption with
1213	  hit-under-miss enabled). It sets the undocumented bit 31 in
1214	  the auxiliary control register and the FI bit in the control
1215	  register, thus disabling hit-under-miss without putting the
1216	  processor into full low interrupt latency mode. ARM11MPCore
1217	  is not affected.
1218
1219config ARM_ERRATA_764369
1220	bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1221	depends on CPU_V7 && SMP
1222	help
1223	  This option enables the workaround for erratum 764369
1224	  affecting Cortex-A9 MPCore with two or more processors (all
1225	  current revisions). Under certain timing circumstances, a data
1226	  cache line maintenance operation by MVA targeting an Inner
1227	  Shareable memory region may fail to proceed up to either the
1228	  Point of Coherency or to the Point of Unification of the
1229	  system. This workaround adds a DSB instruction before the
1230	  relevant cache maintenance functions and sets a specific bit
1231	  in the diagnostic control register of the SCU.
1232
1233config ARM_ERRATA_775420
1234       bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1235       depends on CPU_V7
1236       help
1237	 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1238	 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1239	 operation aborts with MMU exception, it might cause the processor
1240	 to deadlock. This workaround puts DSB before executing ISB if
1241	 an abort may occur on cache maintenance.
1242
1243config ARM_ERRATA_798181
1244	bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1245	depends on CPU_V7 && SMP
1246	help
1247	  On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1248	  adequately shooting down all use of the old entries. This
1249	  option enables the Linux kernel workaround for this erratum
1250	  which sends an IPI to the CPUs that are running the same ASID
1251	  as the one being invalidated.
1252
1253config ARM_ERRATA_773022
1254	bool "ARM errata: incorrect instructions may be executed from loop buffer"
1255	depends on CPU_V7
1256	help
1257	  This option enables the workaround for the 773022 Cortex-A15
1258	  (up to r0p4) erratum. In certain rare sequences of code, the
1259	  loop buffer may deliver incorrect instructions. This
1260	  workaround disables the loop buffer to avoid the erratum.
1261
1262endmenu
1263
1264source "arch/arm/common/Kconfig"
1265
1266menu "Bus support"
1267
1268config ISA
1269	bool
1270	help
1271	  Find out whether you have ISA slots on your motherboard.  ISA is the
1272	  name of a bus system, i.e. the way the CPU talks to the other stuff
1273	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
1274	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1275	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
1276
1277# Select ISA DMA controller support
1278config ISA_DMA
1279	bool
1280	select ISA_DMA_API
1281
1282# Select ISA DMA interface
1283config ISA_DMA_API
1284	bool
1285
1286config PCI
1287	bool "PCI support" if MIGHT_HAVE_PCI
1288	help
1289	  Find out whether you have a PCI motherboard. PCI is the name of a
1290	  bus system, i.e. the way the CPU talks to the other stuff inside
1291	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1292	  VESA. If you have PCI, say Y, otherwise N.
1293
1294config PCI_DOMAINS
1295	bool
1296	depends on PCI
1297
1298config PCI_DOMAINS_GENERIC
1299	def_bool PCI_DOMAINS
1300
1301config PCI_NANOENGINE
1302	bool "BSE nanoEngine PCI support"
1303	depends on SA1100_NANOENGINE
1304	help
1305	  Enable PCI on the BSE nanoEngine board.
1306
1307config PCI_SYSCALL
1308	def_bool PCI
1309
1310config PCI_HOST_ITE8152
1311	bool
1312	depends on PCI && MACH_ARMCORE
1313	default y
1314	select DMABOUNCE
1315
1316source "drivers/pci/Kconfig"
1317source "drivers/pci/pcie/Kconfig"
1318
1319source "drivers/pcmcia/Kconfig"
1320
1321endmenu
1322
1323menu "Kernel Features"
1324
1325config HAVE_SMP
1326	bool
1327	help
1328	  This option should be selected by machines which have an SMP-
1329	  capable CPU.
1330
1331	  The only effect of this option is to make the SMP-related
1332	  options available to the user for configuration.
1333
1334config SMP
1335	bool "Symmetric Multi-Processing"
1336	depends on CPU_V6K || CPU_V7
1337	depends on GENERIC_CLOCKEVENTS
1338	depends on HAVE_SMP
1339	depends on MMU || ARM_MPU
1340	select IRQ_WORK
1341	help
1342	  This enables support for systems with more than one CPU. If you have
1343	  a system with only one CPU, say N. If you have a system with more
1344	  than one CPU, say Y.
1345
1346	  If you say N here, the kernel will run on uni- and multiprocessor
1347	  machines, but will use only one CPU of a multiprocessor machine. If
1348	  you say Y here, the kernel will run on many, but not all,
1349	  uniprocessor machines. On a uniprocessor machine, the kernel
1350	  will run faster if you say N here.
1351
1352	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
1353	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1354	  <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1355
1356	  If you don't know what to do here, say N.
1357
1358config SMP_ON_UP
1359	bool "Allow booting SMP kernel on uniprocessor systems"
1360	depends on SMP && !XIP_KERNEL && MMU
1361	default y
1362	help
1363	  SMP kernels contain instructions which fail on non-SMP processors.
1364	  Enabling this option allows the kernel to modify itself to make
1365	  these instructions safe.  Disabling it allows about 1K of space
1366	  savings.
1367
1368	  If you don't know what to do here, say Y.
1369
1370config ARM_CPU_TOPOLOGY
1371	bool "Support cpu topology definition"
1372	depends on SMP && CPU_V7
1373	default y
1374	help
1375	  Support ARM cpu topology definition. The MPIDR register defines
1376	  affinity between processors which is then used to describe the cpu
1377	  topology of an ARM System.
1378
1379config SCHED_MC
1380	bool "Multi-core scheduler support"
1381	depends on ARM_CPU_TOPOLOGY
1382	help
1383	  Multi-core scheduler support improves the CPU scheduler's decision
1384	  making when dealing with multi-core CPU chips at a cost of slightly
1385	  increased overhead in some places. If unsure say N here.
1386
1387config SCHED_SMT
1388	bool "SMT scheduler support"
1389	depends on ARM_CPU_TOPOLOGY
1390	help
1391	  Improves the CPU scheduler's decision making when dealing with
1392	  MultiThreading at a cost of slightly increased overhead in some
1393	  places. If unsure say N here.
1394
1395config HAVE_ARM_SCU
1396	bool
1397	help
1398	  This option enables support for the ARM system coherency unit
1399
1400config HAVE_ARM_ARCH_TIMER
1401	bool "Architected timer support"
1402	depends on CPU_V7
1403	select ARM_ARCH_TIMER
1404	select GENERIC_CLOCKEVENTS
1405	help
1406	  This option enables support for the ARM architected timer
1407
1408config HAVE_ARM_TWD
1409	bool
1410	depends on SMP
1411	select CLKSRC_OF if OF
1412	help
1413	  This options enables support for the ARM timer and watchdog unit
1414
1415config MCPM
1416	bool "Multi-Cluster Power Management"
1417	depends on CPU_V7 && SMP
1418	help
1419	  This option provides the common power management infrastructure
1420	  for (multi-)cluster based systems, such as big.LITTLE based
1421	  systems.
1422
1423config MCPM_QUAD_CLUSTER
1424	bool
1425	depends on MCPM
1426	help
1427	  To avoid wasting resources unnecessarily, MCPM only supports up
1428	  to 2 clusters by default.
1429	  Platforms with 3 or 4 clusters that use MCPM must select this
1430	  option to allow the additional clusters to be managed.
1431
1432config BIG_LITTLE
1433	bool "big.LITTLE support (Experimental)"
1434	depends on CPU_V7 && SMP
1435	select MCPM
1436	help
1437	  This option enables support selections for the big.LITTLE
1438	  system architecture.
1439
1440config BL_SWITCHER
1441	bool "big.LITTLE switcher support"
1442	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1443	select ARM_CPU_SUSPEND
1444	select CPU_PM
1445	help
1446	  The big.LITTLE "switcher" provides the core functionality to
1447	  transparently handle transition between a cluster of A15's
1448	  and a cluster of A7's in a big.LITTLE system.
1449
1450config BL_SWITCHER_DUMMY_IF
1451	tristate "Simple big.LITTLE switcher user interface"
1452	depends on BL_SWITCHER && DEBUG_KERNEL
1453	help
1454	  This is a simple and dummy char dev interface to control
1455	  the big.LITTLE switcher core code.  It is meant for
1456	  debugging purposes only.
1457
1458choice
1459	prompt "Memory split"
1460	depends on MMU
1461	default VMSPLIT_3G
1462	help
1463	  Select the desired split between kernel and user memory.
1464
1465	  If you are not absolutely sure what you are doing, leave this
1466	  option alone!
1467
1468	config VMSPLIT_3G
1469		bool "3G/1G user/kernel split"
1470	config VMSPLIT_2G
1471		bool "2G/2G user/kernel split"
1472	config VMSPLIT_1G
1473		bool "1G/3G user/kernel split"
1474endchoice
1475
1476config PAGE_OFFSET
1477	hex
1478	default PHYS_OFFSET if !MMU
1479	default 0x40000000 if VMSPLIT_1G
1480	default 0x80000000 if VMSPLIT_2G
1481	default 0xC0000000
1482
1483config NR_CPUS
1484	int "Maximum number of CPUs (2-32)"
1485	range 2 32
1486	depends on SMP
1487	default "4"
1488
1489config HOTPLUG_CPU
1490	bool "Support for hot-pluggable CPUs"
1491	depends on SMP
1492	help
1493	  Say Y here to experiment with turning CPUs off and on.  CPUs
1494	  can be controlled through /sys/devices/system/cpu.
1495
1496config ARM_PSCI
1497	bool "Support for the ARM Power State Coordination Interface (PSCI)"
1498	depends on CPU_V7
1499	help
1500	  Say Y here if you want Linux to communicate with system firmware
1501	  implementing the PSCI specification for CPU-centric power
1502	  management operations described in ARM document number ARM DEN
1503	  0022A ("Power State Coordination Interface System Software on
1504	  ARM processors").
1505
1506# The GPIO number here must be sorted by descending number. In case of
1507# a multiplatform kernel, we just want the highest value required by the
1508# selected platforms.
1509config ARCH_NR_GPIO
1510	int
1511	default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1512		ARCH_ZYNQ
1513	default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1514		SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1515	default 416 if ARCH_SUNXI
1516	default 392 if ARCH_U8500
1517	default 352 if ARCH_VT8500
1518	default 288 if ARCH_ROCKCHIP
1519	default 264 if MACH_H4700
1520	default 0
1521	help
1522	  Maximum number of GPIOs in the system.
1523
1524	  If unsure, leave the default value.
1525
1526source kernel/Kconfig.preempt
1527
1528config HZ_FIXED
1529	int
1530	default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1531		ARCH_S5PV210 || ARCH_EXYNOS4
1532	default 128 if SOC_AT91RM9200
1533	default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1534	default 0
1535
1536choice
1537	depends on HZ_FIXED = 0
1538	prompt "Timer frequency"
1539
1540config HZ_100
1541	bool "100 Hz"
1542
1543config HZ_200
1544	bool "200 Hz"
1545
1546config HZ_250
1547	bool "250 Hz"
1548
1549config HZ_300
1550	bool "300 Hz"
1551
1552config HZ_500
1553	bool "500 Hz"
1554
1555config HZ_1000
1556	bool "1000 Hz"
1557
1558endchoice
1559
1560config HZ
1561	int
1562	default HZ_FIXED if HZ_FIXED != 0
1563	default 100 if HZ_100
1564	default 200 if HZ_200
1565	default 250 if HZ_250
1566	default 300 if HZ_300
1567	default 500 if HZ_500
1568	default 1000
1569
1570config SCHED_HRTICK
1571	def_bool HIGH_RES_TIMERS
1572
1573config THUMB2_KERNEL
1574	bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1575	depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1576	default y if CPU_THUMBONLY
1577	select AEABI
1578	select ARM_ASM_UNIFIED
1579	select ARM_UNWIND
1580	help
1581	  By enabling this option, the kernel will be compiled in
1582	  Thumb-2 mode. A compiler/assembler that understand the unified
1583	  ARM-Thumb syntax is needed.
1584
1585	  If unsure, say N.
1586
1587config THUMB2_AVOID_R_ARM_THM_JUMP11
1588	bool "Work around buggy Thumb-2 short branch relocations in gas"
1589	depends on THUMB2_KERNEL && MODULES
1590	default y
1591	help
1592	  Various binutils versions can resolve Thumb-2 branches to
1593	  locally-defined, preemptible global symbols as short-range "b.n"
1594	  branch instructions.
1595
1596	  This is a problem, because there's no guarantee the final
1597	  destination of the symbol, or any candidate locations for a
1598	  trampoline, are within range of the branch.  For this reason, the
1599	  kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1600	  relocation in modules at all, and it makes little sense to add
1601	  support.
1602
1603	  The symptom is that the kernel fails with an "unsupported
1604	  relocation" error when loading some modules.
1605
1606	  Until fixed tools are available, passing
1607	  -fno-optimize-sibling-calls to gcc should prevent gcc generating
1608	  code which hits this problem, at the cost of a bit of extra runtime
1609	  stack usage in some cases.
1610
1611	  The problem is described in more detail at:
1612	      https://bugs.launchpad.net/binutils-linaro/+bug/725126
1613
1614	  Only Thumb-2 kernels are affected.
1615
1616	  Unless you are sure your tools don't have this problem, say Y.
1617
1618config ARM_ASM_UNIFIED
1619	bool
1620
1621config AEABI
1622	bool "Use the ARM EABI to compile the kernel"
1623	help
1624	  This option allows for the kernel to be compiled using the latest
1625	  ARM ABI (aka EABI).  This is only useful if you are using a user
1626	  space environment that is also compiled with EABI.
1627
1628	  Since there are major incompatibilities between the legacy ABI and
1629	  EABI, especially with regard to structure member alignment, this
1630	  option also changes the kernel syscall calling convention to
1631	  disambiguate both ABIs and allow for backward compatibility support
1632	  (selected with CONFIG_OABI_COMPAT).
1633
1634	  To use this you need GCC version 4.0.0 or later.
1635
1636config OABI_COMPAT
1637	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1638	depends on AEABI && !THUMB2_KERNEL
1639	help
1640	  This option preserves the old syscall interface along with the
1641	  new (ARM EABI) one. It also provides a compatibility layer to
1642	  intercept syscalls that have structure arguments which layout
1643	  in memory differs between the legacy ABI and the new ARM EABI
1644	  (only for non "thumb" binaries). This option adds a tiny
1645	  overhead to all syscalls and produces a slightly larger kernel.
1646
1647	  The seccomp filter system will not be available when this is
1648	  selected, since there is no way yet to sensibly distinguish
1649	  between calling conventions during filtering.
1650
1651	  If you know you'll be using only pure EABI user space then you
1652	  can say N here. If this option is not selected and you attempt
1653	  to execute a legacy ABI binary then the result will be
1654	  UNPREDICTABLE (in fact it can be predicted that it won't work
1655	  at all). If in doubt say N.
1656
1657config ARCH_HAS_HOLES_MEMORYMODEL
1658	bool
1659
1660config ARCH_SPARSEMEM_ENABLE
1661	bool
1662
1663config ARCH_SPARSEMEM_DEFAULT
1664	def_bool ARCH_SPARSEMEM_ENABLE
1665
1666config ARCH_SELECT_MEMORY_MODEL
1667	def_bool ARCH_SPARSEMEM_ENABLE
1668
1669config HAVE_ARCH_PFN_VALID
1670	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1671
1672config HAVE_GENERIC_RCU_GUP
1673	def_bool y
1674	depends on ARM_LPAE
1675
1676config HIGHMEM
1677	bool "High Memory Support"
1678	depends on MMU
1679	help
1680	  The address space of ARM processors is only 4 Gigabytes large
1681	  and it has to accommodate user address space, kernel address
1682	  space as well as some memory mapped IO. That means that, if you
1683	  have a large amount of physical memory and/or IO, not all of the
1684	  memory can be "permanently mapped" by the kernel. The physical
1685	  memory that is not permanently mapped is called "high memory".
1686
1687	  Depending on the selected kernel/user memory split, minimum
1688	  vmalloc space and actual amount of RAM, you may not need this
1689	  option which should result in a slightly faster kernel.
1690
1691	  If unsure, say n.
1692
1693config HIGHPTE
1694	bool "Allocate 2nd-level pagetables from highmem"
1695	depends on HIGHMEM
1696	help
1697	  The VM uses one page of physical memory for each page table.
1698	  For systems with a lot of processes, this can use a lot of
1699	  precious low memory, eventually leading to low memory being
1700	  consumed by page tables.  Setting this option will allow
1701	  user-space 2nd level page tables to reside in high memory.
1702
1703config HW_PERF_EVENTS
1704	bool "Enable hardware performance counter support for perf events"
1705	depends on PERF_EVENTS
1706	default y
1707	help
1708	  Enable hardware performance counter support for perf events. If
1709	  disabled, perf events will use software events only.
1710
1711config SYS_SUPPORTS_HUGETLBFS
1712       def_bool y
1713       depends on ARM_LPAE
1714
1715config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1716       def_bool y
1717       depends on ARM_LPAE
1718
1719config ARCH_WANT_GENERAL_HUGETLB
1720	def_bool y
1721
1722config ARM_MODULE_PLTS
1723	bool "Use PLTs to allow module memory to spill over into vmalloc area"
1724	depends on MODULES
1725	help
1726	  Allocate PLTs when loading modules so that jumps and calls whose
1727	  targets are too far away for their relative offsets to be encoded
1728	  in the instructions themselves can be bounced via veneers in the
1729	  module's PLT. This allows modules to be allocated in the generic
1730	  vmalloc area after the dedicated module memory area has been
1731	  exhausted. The modules will use slightly more memory, but after
1732	  rounding up to page size, the actual memory footprint is usually
1733	  the same.
1734
1735	  Say y if you are getting out of memory errors while loading modules
1736
1737source "mm/Kconfig"
1738
1739config FORCE_MAX_ZONEORDER
1740	int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1741	range 11 64 if ARCH_SHMOBILE_LEGACY
1742	default "12" if SOC_AM33XX
1743	default "9" if SA1111 || ARCH_EFM32
1744	default "11"
1745	help
1746	  The kernel memory allocator divides physically contiguous memory
1747	  blocks into "zones", where each zone is a power of two number of
1748	  pages.  This option selects the largest power of two that the kernel
1749	  keeps in the memory allocator.  If you need to allocate very large
1750	  blocks of physically contiguous memory, then you may need to
1751	  increase this value.
1752
1753	  This config option is actually maximum order plus one. For example,
1754	  a value of 11 means that the largest free memory block is 2^10 pages.
1755
1756config ALIGNMENT_TRAP
1757	bool
1758	depends on CPU_CP15_MMU
1759	default y if !ARCH_EBSA110
1760	select HAVE_PROC_CPU if PROC_FS
1761	help
1762	  ARM processors cannot fetch/store information which is not
1763	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1764	  address divisible by 4. On 32-bit ARM processors, these non-aligned
1765	  fetch/store instructions will be emulated in software if you say
1766	  here, which has a severe performance impact. This is necessary for
1767	  correct operation of some network protocols. With an IP-only
1768	  configuration it is safe to say N, otherwise say Y.
1769
1770config UACCESS_WITH_MEMCPY
1771	bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1772	depends on MMU
1773	default y if CPU_FEROCEON
1774	help
1775	  Implement faster copy_to_user and clear_user methods for CPU
1776	  cores where a 8-word STM instruction give significantly higher
1777	  memory write throughput than a sequence of individual 32bit stores.
1778
1779	  A possible side effect is a slight increase in scheduling latency
1780	  between threads sharing the same address space if they invoke
1781	  such copy operations with large buffers.
1782
1783	  However, if the CPU data cache is using a write-allocate mode,
1784	  this option is unlikely to provide any performance gain.
1785
1786config SECCOMP
1787	bool
1788	prompt "Enable seccomp to safely compute untrusted bytecode"
1789	---help---
1790	  This kernel feature is useful for number crunching applications
1791	  that may need to compute untrusted bytecode during their
1792	  execution. By using pipes or other transports made available to
1793	  the process as file descriptors supporting the read/write
1794	  syscalls, it's possible to isolate those applications in
1795	  their own address space using seccomp. Once seccomp is
1796	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1797	  and the task is only allowed to execute a few safe syscalls
1798	  defined by each seccomp mode.
1799
1800config SWIOTLB
1801	def_bool y
1802
1803config IOMMU_HELPER
1804	def_bool SWIOTLB
1805
1806config XEN_DOM0
1807	def_bool y
1808	depends on XEN
1809
1810config XEN
1811	bool "Xen guest support on ARM"
1812	depends on ARM && AEABI && OF
1813	depends on CPU_V7 && !CPU_V6
1814	depends on !GENERIC_ATOMIC64
1815	depends on MMU
1816	select ARCH_DMA_ADDR_T_64BIT
1817	select ARM_PSCI
1818	select SWIOTLB_XEN
1819	help
1820	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1821
1822endmenu
1823
1824menu "Boot options"
1825
1826config USE_OF
1827	bool "Flattened Device Tree support"
1828	select IRQ_DOMAIN
1829	select OF
1830	select OF_EARLY_FLATTREE
1831	select OF_RESERVED_MEM
1832	help
1833	  Include support for flattened device tree machine descriptions.
1834
1835config ATAGS
1836	bool "Support for the traditional ATAGS boot data passing" if USE_OF
1837	default y
1838	help
1839	  This is the traditional way of passing data to the kernel at boot
1840	  time. If you are solely relying on the flattened device tree (or
1841	  the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1842	  to remove ATAGS support from your kernel binary.  If unsure,
1843	  leave this to y.
1844
1845config DEPRECATED_PARAM_STRUCT
1846	bool "Provide old way to pass kernel parameters"
1847	depends on ATAGS
1848	help
1849	  This was deprecated in 2001 and announced to live on for 5 years.
1850	  Some old boot loaders still use this way.
1851
1852# Compressed boot loader in ROM.  Yes, we really want to ask about
1853# TEXT and BSS so we preserve their values in the config files.
1854config ZBOOT_ROM_TEXT
1855	hex "Compressed ROM boot loader base address"
1856	default "0"
1857	help
1858	  The physical address at which the ROM-able zImage is to be
1859	  placed in the target.  Platforms which normally make use of
1860	  ROM-able zImage formats normally set this to a suitable
1861	  value in their defconfig file.
1862
1863	  If ZBOOT_ROM is not enabled, this has no effect.
1864
1865config ZBOOT_ROM_BSS
1866	hex "Compressed ROM boot loader BSS address"
1867	default "0"
1868	help
1869	  The base address of an area of read/write memory in the target
1870	  for the ROM-able zImage which must be available while the
1871	  decompressor is running. It must be large enough to hold the
1872	  entire decompressed kernel plus an additional 128 KiB.
1873	  Platforms which normally make use of ROM-able zImage formats
1874	  normally set this to a suitable value in their defconfig file.
1875
1876	  If ZBOOT_ROM is not enabled, this has no effect.
1877
1878config ZBOOT_ROM
1879	bool "Compressed boot loader in ROM/flash"
1880	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1881	depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1882	help
1883	  Say Y here if you intend to execute your compressed kernel image
1884	  (zImage) directly from ROM or flash.  If unsure, say N.
1885
1886config ARM_APPENDED_DTB
1887	bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1888	depends on OF
1889	help
1890	  With this option, the boot code will look for a device tree binary
1891	  (DTB) appended to zImage
1892	  (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1893
1894	  This is meant as a backward compatibility convenience for those
1895	  systems with a bootloader that can't be upgraded to accommodate
1896	  the documented boot protocol using a device tree.
1897
1898	  Beware that there is very little in terms of protection against
1899	  this option being confused by leftover garbage in memory that might
1900	  look like a DTB header after a reboot if no actual DTB is appended
1901	  to zImage.  Do not leave this option active in a production kernel
1902	  if you don't intend to always append a DTB.  Proper passing of the
1903	  location into r2 of a bootloader provided DTB is always preferable
1904	  to this option.
1905
1906config ARM_ATAG_DTB_COMPAT
1907	bool "Supplement the appended DTB with traditional ATAG information"
1908	depends on ARM_APPENDED_DTB
1909	help
1910	  Some old bootloaders can't be updated to a DTB capable one, yet
1911	  they provide ATAGs with memory configuration, the ramdisk address,
1912	  the kernel cmdline string, etc.  Such information is dynamically
1913	  provided by the bootloader and can't always be stored in a static
1914	  DTB.  To allow a device tree enabled kernel to be used with such
1915	  bootloaders, this option allows zImage to extract the information
1916	  from the ATAG list and store it at run time into the appended DTB.
1917
1918choice
1919	prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1920	default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1921
1922config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1923	bool "Use bootloader kernel arguments if available"
1924	help
1925	  Uses the command-line options passed by the boot loader instead of
1926	  the device tree bootargs property. If the boot loader doesn't provide
1927	  any, the device tree bootargs property will be used.
1928
1929config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1930	bool "Extend with bootloader kernel arguments"
1931	help
1932	  The command-line arguments provided by the boot loader will be
1933	  appended to the the device tree bootargs property.
1934
1935endchoice
1936
1937config CMDLINE
1938	string "Default kernel command string"
1939	default ""
1940	help
1941	  On some architectures (EBSA110 and CATS), there is currently no way
1942	  for the boot loader to pass arguments to the kernel. For these
1943	  architectures, you should supply some command-line options at build
1944	  time by entering them here. As a minimum, you should specify the
1945	  memory size and the root device (e.g., mem=64M root=/dev/nfs).
1946
1947choice
1948	prompt "Kernel command line type" if CMDLINE != ""
1949	default CMDLINE_FROM_BOOTLOADER
1950	depends on ATAGS
1951
1952config CMDLINE_FROM_BOOTLOADER
1953	bool "Use bootloader kernel arguments if available"
1954	help
1955	  Uses the command-line options passed by the boot loader. If
1956	  the boot loader doesn't provide any, the default kernel command
1957	  string provided in CMDLINE will be used.
1958
1959config CMDLINE_EXTEND
1960	bool "Extend bootloader kernel arguments"
1961	help
1962	  The command-line arguments provided by the boot loader will be
1963	  appended to the default kernel command string.
1964
1965config CMDLINE_FORCE
1966	bool "Always use the default kernel command string"
1967	help
1968	  Always use the default kernel command string, even if the boot
1969	  loader passes other arguments to the kernel.
1970	  This is useful if you cannot or don't want to change the
1971	  command-line options your boot loader passes to the kernel.
1972endchoice
1973
1974config XIP_KERNEL
1975	bool "Kernel Execute-In-Place from ROM"
1976	depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1977	help
1978	  Execute-In-Place allows the kernel to run from non-volatile storage
1979	  directly addressable by the CPU, such as NOR flash. This saves RAM
1980	  space since the text section of the kernel is not loaded from flash
1981	  to RAM.  Read-write sections, such as the data section and stack,
1982	  are still copied to RAM.  The XIP kernel is not compressed since
1983	  it has to run directly from flash, so it will take more space to
1984	  store it.  The flash address used to link the kernel object files,
1985	  and for storing it, is configuration dependent. Therefore, if you
1986	  say Y here, you must know the proper physical address where to
1987	  store the kernel image depending on your own flash memory usage.
1988
1989	  Also note that the make target becomes "make xipImage" rather than
1990	  "make zImage" or "make Image".  The final kernel binary to put in
1991	  ROM memory will be arch/arm/boot/xipImage.
1992
1993	  If unsure, say N.
1994
1995config XIP_PHYS_ADDR
1996	hex "XIP Kernel Physical Location"
1997	depends on XIP_KERNEL
1998	default "0x00080000"
1999	help
2000	  This is the physical address in your flash memory the kernel will
2001	  be linked for and stored to.  This address is dependent on your
2002	  own flash usage.
2003
2004config KEXEC
2005	bool "Kexec system call (EXPERIMENTAL)"
2006	depends on (!SMP || PM_SLEEP_SMP)
2007	depends on !CPU_V7M
2008	help
2009	  kexec is a system call that implements the ability to shutdown your
2010	  current kernel, and to start another kernel.  It is like a reboot
2011	  but it is independent of the system firmware.   And like a reboot
2012	  you can start any kernel with it, not just Linux.
2013
2014	  It is an ongoing process to be certain the hardware in a machine
2015	  is properly shutdown, so do not be surprised if this code does not
2016	  initially work for you.
2017
2018config ATAGS_PROC
2019	bool "Export atags in procfs"
2020	depends on ATAGS && KEXEC
2021	default y
2022	help
2023	  Should the atags used to boot the kernel be exported in an "atags"
2024	  file in procfs. Useful with kexec.
2025
2026config CRASH_DUMP
2027	bool "Build kdump crash kernel (EXPERIMENTAL)"
2028	help
2029	  Generate crash dump after being started by kexec. This should
2030	  be normally only set in special crash dump kernels which are
2031	  loaded in the main kernel with kexec-tools into a specially
2032	  reserved region and then later executed after a crash by
2033	  kdump/kexec. The crash dump kernel must be compiled to a
2034	  memory address not used by the main kernel
2035
2036	  For more details see Documentation/kdump/kdump.txt
2037
2038config AUTO_ZRELADDR
2039	bool "Auto calculation of the decompressed kernel image address"
2040	help
2041	  ZRELADDR is the physical address where the decompressed kernel
2042	  image will be placed. If AUTO_ZRELADDR is selected, the address
2043	  will be determined at run-time by masking the current IP with
2044	  0xf8000000. This assumes the zImage being placed in the first 128MB
2045	  from start of memory.
2046
2047endmenu
2048
2049menu "CPU Power Management"
2050
2051source "drivers/cpufreq/Kconfig"
2052
2053source "drivers/cpuidle/Kconfig"
2054
2055endmenu
2056
2057menu "Floating point emulation"
2058
2059comment "At least one emulation must be selected"
2060
2061config FPE_NWFPE
2062	bool "NWFPE math emulation"
2063	depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2064	---help---
2065	  Say Y to include the NWFPE floating point emulator in the kernel.
2066	  This is necessary to run most binaries. Linux does not currently
2067	  support floating point hardware so you need to say Y here even if
2068	  your machine has an FPA or floating point co-processor podule.
2069
2070	  You may say N here if you are going to load the Acorn FPEmulator
2071	  early in the bootup.
2072
2073config FPE_NWFPE_XP
2074	bool "Support extended precision"
2075	depends on FPE_NWFPE
2076	help
2077	  Say Y to include 80-bit support in the kernel floating-point
2078	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
2079	  Note that gcc does not generate 80-bit operations by default,
2080	  so in most cases this option only enlarges the size of the
2081	  floating point emulator without any good reason.
2082
2083	  You almost surely want to say N here.
2084
2085config FPE_FASTFPE
2086	bool "FastFPE math emulation (EXPERIMENTAL)"
2087	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2088	---help---
2089	  Say Y here to include the FAST floating point emulator in the kernel.
2090	  This is an experimental much faster emulator which now also has full
2091	  precision for the mantissa.  It does not support any exceptions.
2092	  It is very simple, and approximately 3-6 times faster than NWFPE.
2093
2094	  It should be sufficient for most programs.  It may be not suitable
2095	  for scientific calculations, but you have to check this for yourself.
2096	  If you do not feel you need a faster FP emulation you should better
2097	  choose NWFPE.
2098
2099config VFP
2100	bool "VFP-format floating point maths"
2101	depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2102	help
2103	  Say Y to include VFP support code in the kernel. This is needed
2104	  if your hardware includes a VFP unit.
2105
2106	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
2107	  release notes and additional status information.
2108
2109	  Say N if your target does not have VFP hardware.
2110
2111config VFPv3
2112	bool
2113	depends on VFP
2114	default y if CPU_V7
2115
2116config NEON
2117	bool "Advanced SIMD (NEON) Extension support"
2118	depends on VFPv3 && CPU_V7
2119	help
2120	  Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2121	  Extension.
2122
2123config KERNEL_MODE_NEON
2124	bool "Support for NEON in kernel mode"
2125	depends on NEON && AEABI
2126	help
2127	  Say Y to include support for NEON in kernel mode.
2128
2129endmenu
2130
2131menu "Userspace binary formats"
2132
2133source "fs/Kconfig.binfmt"
2134
2135endmenu
2136
2137menu "Power management options"
2138
2139source "kernel/power/Kconfig"
2140
2141config ARCH_SUSPEND_POSSIBLE
2142	depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2143		CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2144	def_bool y
2145
2146config ARM_CPU_SUSPEND
2147	def_bool PM_SLEEP
2148
2149config ARCH_HIBERNATION_POSSIBLE
2150	bool
2151	depends on MMU
2152	default y if ARCH_SUSPEND_POSSIBLE
2153
2154endmenu
2155
2156source "net/Kconfig"
2157
2158source "drivers/Kconfig"
2159
2160source "drivers/firmware/Kconfig"
2161
2162source "fs/Kconfig"
2163
2164source "arch/arm/Kconfig.debug"
2165
2166source "security/Kconfig"
2167
2168source "crypto/Kconfig"
2169if CRYPTO
2170source "arch/arm/crypto/Kconfig"
2171endif
2172
2173source "lib/Kconfig"
2174
2175source "arch/arm/kvm/Kconfig"
2176