xref: /linux/arch/arm/Kconfig (revision 9d796e66230205cd3366f5660387bd9ecca9d336)
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 GENERIC_ALLOCATOR
19	select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
20	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
21	select GENERIC_IDLE_POLL_SETUP
22	select GENERIC_IRQ_PROBE
23	select GENERIC_IRQ_SHOW
24	select GENERIC_IRQ_SHOW_LEVEL
25	select GENERIC_PCI_IOMAP
26	select GENERIC_SCHED_CLOCK
27	select GENERIC_SMP_IDLE_THREAD
28	select GENERIC_STRNCPY_FROM_USER
29	select GENERIC_STRNLEN_USER
30	select HANDLE_DOMAIN_IRQ
31	select HARDIRQS_SW_RESEND
32	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
33	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
34	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
35	select HAVE_ARCH_KGDB
36	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
37	select HAVE_ARCH_TRACEHOOK
38	select HAVE_BPF_JIT
39	select HAVE_CC_STACKPROTECTOR
40	select HAVE_CONTEXT_TRACKING
41	select HAVE_C_RECORDMCOUNT
42	select HAVE_DEBUG_KMEMLEAK
43	select HAVE_DMA_API_DEBUG
44	select HAVE_DMA_ATTRS
45	select HAVE_DMA_CONTIGUOUS if MMU
46	select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
47	select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
48	select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
49	select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
50	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
51	select HAVE_GENERIC_DMA_COHERENT
52	select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
53	select HAVE_IDE if PCI || ISA || PCMCIA
54	select HAVE_IRQ_TIME_ACCOUNTING
55	select HAVE_KERNEL_GZIP
56	select HAVE_KERNEL_LZ4
57	select HAVE_KERNEL_LZMA
58	select HAVE_KERNEL_LZO
59	select HAVE_KERNEL_XZ
60	select HAVE_KPROBES if !XIP_KERNEL
61	select HAVE_KRETPROBES if (HAVE_KPROBES)
62	select HAVE_MEMBLOCK
63	select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
64	select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
65	select HAVE_OPTPROBES if !THUMB2_KERNEL
66	select HAVE_PERF_EVENTS
67	select HAVE_PERF_REGS
68	select HAVE_PERF_USER_STACK_DUMP
69	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
70	select HAVE_REGS_AND_STACK_ACCESS_API
71	select HAVE_SYSCALL_TRACEPOINTS
72	select HAVE_UID16
73	select HAVE_VIRT_CPU_ACCOUNTING_GEN
74	select IRQ_FORCED_THREADING
75	select MODULES_USE_ELF_REL
76	select NO_BOOTMEM
77	select OLD_SIGACTION
78	select OLD_SIGSUSPEND3
79	select PERF_USE_VMALLOC
80	select RTC_LIB
81	select SYS_SUPPORTS_APM_EMULATION
82	# Above selects are sorted alphabetically; please add new ones
83	# according to that.  Thanks.
84	help
85	  The ARM series is a line of low-power-consumption RISC chip designs
86	  licensed by ARM Ltd and targeted at embedded applications and
87	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
88	  manufactured, but legacy ARM-based PC hardware remains popular in
89	  Europe.  There is an ARM Linux project with a web page at
90	  <http://www.arm.linux.org.uk/>.
91
92config ARM_HAS_SG_CHAIN
93	select ARCH_HAS_SG_CHAIN
94	bool
95
96config NEED_SG_DMA_LENGTH
97	bool
98
99config ARM_DMA_USE_IOMMU
100	bool
101	select ARM_HAS_SG_CHAIN
102	select NEED_SG_DMA_LENGTH
103
104if ARM_DMA_USE_IOMMU
105
106config ARM_DMA_IOMMU_ALIGNMENT
107	int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
108	range 4 9
109	default 8
110	help
111	  DMA mapping framework by default aligns all buffers to the smallest
112	  PAGE_SIZE order which is greater than or equal to the requested buffer
113	  size. This works well for buffers up to a few hundreds kilobytes, but
114	  for larger buffers it just a waste of address space. Drivers which has
115	  relatively small addressing window (like 64Mib) might run out of
116	  virtual space with just a few allocations.
117
118	  With this parameter you can specify the maximum PAGE_SIZE order for
119	  DMA IOMMU buffers. Larger buffers will be aligned only to this
120	  specified order. The order is expressed as a power of two multiplied
121	  by the PAGE_SIZE.
122
123endif
124
125config MIGHT_HAVE_PCI
126	bool
127
128config SYS_SUPPORTS_APM_EMULATION
129	bool
130
131config HAVE_TCM
132	bool
133	select GENERIC_ALLOCATOR
134
135config HAVE_PROC_CPU
136	bool
137
138config NO_IOPORT_MAP
139	bool
140
141config EISA
142	bool
143	---help---
144	  The Extended Industry Standard Architecture (EISA) bus was
145	  developed as an open alternative to the IBM MicroChannel bus.
146
147	  The EISA bus provided some of the features of the IBM MicroChannel
148	  bus while maintaining backward compatibility with cards made for
149	  the older ISA bus.  The EISA bus saw limited use between 1988 and
150	  1995 when it was made obsolete by the PCI bus.
151
152	  Say Y here if you are building a kernel for an EISA-based machine.
153
154	  Otherwise, say N.
155
156config SBUS
157	bool
158
159config STACKTRACE_SUPPORT
160	bool
161	default y
162
163config HAVE_LATENCYTOP_SUPPORT
164	bool
165	depends on !SMP
166	default y
167
168config LOCKDEP_SUPPORT
169	bool
170	default y
171
172config TRACE_IRQFLAGS_SUPPORT
173	bool
174	default y
175
176config RWSEM_XCHGADD_ALGORITHM
177	bool
178	default y
179
180config ARCH_HAS_ILOG2_U32
181	bool
182
183config ARCH_HAS_ILOG2_U64
184	bool
185
186config ARCH_HAS_BANDGAP
187	bool
188
189config GENERIC_HWEIGHT
190	bool
191	default y
192
193config GENERIC_CALIBRATE_DELAY
194	bool
195	default y
196
197config ARCH_MAY_HAVE_PC_FDC
198	bool
199
200config ZONE_DMA
201	bool
202
203config NEED_DMA_MAP_STATE
204       def_bool y
205
206config ARCH_SUPPORTS_UPROBES
207	def_bool y
208
209config ARCH_HAS_DMA_SET_COHERENT_MASK
210	bool
211
212config GENERIC_ISA_DMA
213	bool
214
215config FIQ
216	bool
217
218config NEED_RET_TO_USER
219	bool
220
221config ARCH_MTD_XIP
222	bool
223
224config VECTORS_BASE
225	hex
226	default 0xffff0000 if MMU || CPU_HIGH_VECTOR
227	default DRAM_BASE if REMAP_VECTORS_TO_RAM
228	default 0x00000000
229	help
230	  The base address of exception vectors.  This must be two pages
231	  in size.
232
233config ARM_PATCH_PHYS_VIRT
234	bool "Patch physical to virtual translations at runtime" if EMBEDDED
235	default y
236	depends on !XIP_KERNEL && MMU
237	depends on !ARCH_REALVIEW || !SPARSEMEM
238	help
239	  Patch phys-to-virt and virt-to-phys translation functions at
240	  boot and module load time according to the position of the
241	  kernel in system memory.
242
243	  This can only be used with non-XIP MMU kernels where the base
244	  of physical memory is at a 16MB boundary.
245
246	  Only disable this option if you know that you do not require
247	  this feature (eg, building a kernel for a single machine) and
248	  you need to shrink the kernel to the minimal size.
249
250config NEED_MACH_IO_H
251	bool
252	help
253	  Select this when mach/io.h is required to provide special
254	  definitions for this platform.  The need for mach/io.h should
255	  be avoided when possible.
256
257config NEED_MACH_MEMORY_H
258	bool
259	help
260	  Select this when mach/memory.h is required to provide special
261	  definitions for this platform.  The need for mach/memory.h should
262	  be avoided when possible.
263
264config PHYS_OFFSET
265	hex "Physical address of main memory" if MMU
266	depends on !ARM_PATCH_PHYS_VIRT
267	default DRAM_BASE if !MMU
268	default 0x00000000 if ARCH_EBSA110 || \
269			EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
270			ARCH_FOOTBRIDGE || \
271			ARCH_INTEGRATOR || \
272			ARCH_IOP13XX || \
273			ARCH_KS8695 || \
274			(ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
275	default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
276	default 0x20000000 if ARCH_S5PV210
277	default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
278	default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
279	default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
280	default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
281	default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
282	help
283	  Please provide the physical address corresponding to the
284	  location of main memory in your system.
285
286config GENERIC_BUG
287	def_bool y
288	depends on BUG
289
290config PGTABLE_LEVELS
291	int
292	default 3 if ARM_LPAE
293	default 2
294
295source "init/Kconfig"
296
297source "kernel/Kconfig.freezer"
298
299menu "System Type"
300
301config MMU
302	bool "MMU-based Paged Memory Management Support"
303	default y
304	help
305	  Select if you want MMU-based virtualised addressing space
306	  support by paged memory management. If unsure, say 'Y'.
307
308#
309# The "ARM system type" choice list is ordered alphabetically by option
310# text.  Please add new entries in the option alphabetic order.
311#
312choice
313	prompt "ARM system type"
314	default ARCH_VERSATILE if !MMU
315	default ARCH_MULTIPLATFORM if MMU
316
317config ARCH_MULTIPLATFORM
318	bool "Allow multiple platforms to be selected"
319	depends on MMU
320	select ARCH_WANT_OPTIONAL_GPIOLIB
321	select ARM_HAS_SG_CHAIN
322	select ARM_PATCH_PHYS_VIRT
323	select AUTO_ZRELADDR
324	select CLKSRC_OF
325	select COMMON_CLK
326	select GENERIC_CLOCKEVENTS
327	select MIGHT_HAVE_PCI
328	select MULTI_IRQ_HANDLER
329	select SPARSE_IRQ
330	select USE_OF
331
332config ARCH_REALVIEW
333	bool "ARM Ltd. RealView family"
334	select ARCH_WANT_OPTIONAL_GPIOLIB
335	select ARM_AMBA
336	select ARM_TIMER_SP804
337	select COMMON_CLK
338	select COMMON_CLK_VERSATILE
339	select GENERIC_CLOCKEVENTS
340	select GPIO_PL061 if GPIOLIB
341	select ICST
342	select NEED_MACH_MEMORY_H
343	select PLAT_VERSATILE
344	select PLAT_VERSATILE_SCHED_CLOCK
345	help
346	  This enables support for ARM Ltd RealView boards.
347
348config ARCH_VERSATILE
349	bool "ARM Ltd. Versatile family"
350	select ARCH_WANT_OPTIONAL_GPIOLIB
351	select ARM_AMBA
352	select ARM_TIMER_SP804
353	select ARM_VIC
354	select CLKDEV_LOOKUP
355	select GENERIC_CLOCKEVENTS
356	select HAVE_MACH_CLKDEV
357	select ICST
358	select PLAT_VERSATILE
359	select PLAT_VERSATILE_CLOCK
360	select PLAT_VERSATILE_SCHED_CLOCK
361	select VERSATILE_FPGA_IRQ
362	help
363	  This enables support for ARM Ltd Versatile board.
364
365config ARCH_AT91
366	bool "Atmel AT91"
367	select ARCH_REQUIRE_GPIOLIB
368	select CLKDEV_LOOKUP
369	select IRQ_DOMAIN
370	select NEED_MACH_IO_H if PCCARD
371	select PINCTRL
372	select PINCTRL_AT91
373	select USE_OF
374	help
375	  This enables support for systems based on Atmel
376	  AT91RM9200, AT91SAM9 and SAMA5 processors.
377
378config ARCH_CLPS711X
379	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
380	select ARCH_REQUIRE_GPIOLIB
381	select AUTO_ZRELADDR
382	select CLKSRC_MMIO
383	select COMMON_CLK
384	select CPU_ARM720T
385	select GENERIC_CLOCKEVENTS
386	select MFD_SYSCON
387	select SOC_BUS
388	help
389	  Support for Cirrus Logic 711x/721x/731x based boards.
390
391config ARCH_GEMINI
392	bool "Cortina Systems Gemini"
393	select ARCH_REQUIRE_GPIOLIB
394	select CLKSRC_MMIO
395	select CPU_FA526
396	select GENERIC_CLOCKEVENTS
397	help
398	  Support for the Cortina Systems Gemini family SoCs
399
400config ARCH_EBSA110
401	bool "EBSA-110"
402	select ARCH_USES_GETTIMEOFFSET
403	select CPU_SA110
404	select ISA
405	select NEED_MACH_IO_H
406	select NEED_MACH_MEMORY_H
407	select NO_IOPORT_MAP
408	help
409	  This is an evaluation board for the StrongARM processor available
410	  from Digital. It has limited hardware on-board, including an
411	  Ethernet interface, two PCMCIA sockets, two serial ports and a
412	  parallel port.
413
414config ARCH_EFM32
415	bool "Energy Micro efm32"
416	depends on !MMU
417	select ARCH_REQUIRE_GPIOLIB
418	select ARM_NVIC
419	select AUTO_ZRELADDR
420	select CLKSRC_OF
421	select COMMON_CLK
422	select CPU_V7M
423	select GENERIC_CLOCKEVENTS
424	select NO_DMA
425	select NO_IOPORT_MAP
426	select SPARSE_IRQ
427	select USE_OF
428	help
429	  Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
430	  processors.
431
432config ARCH_EP93XX
433	bool "EP93xx-based"
434	select ARCH_HAS_HOLES_MEMORYMODEL
435	select ARCH_REQUIRE_GPIOLIB
436	select ARCH_USES_GETTIMEOFFSET
437	select ARM_AMBA
438	select ARM_VIC
439	select CLKDEV_LOOKUP
440	select CPU_ARM920T
441	help
442	  This enables support for the Cirrus EP93xx series of CPUs.
443
444config ARCH_FOOTBRIDGE
445	bool "FootBridge"
446	select CPU_SA110
447	select FOOTBRIDGE
448	select GENERIC_CLOCKEVENTS
449	select HAVE_IDE
450	select NEED_MACH_IO_H if !MMU
451	select NEED_MACH_MEMORY_H
452	help
453	  Support for systems based on the DC21285 companion chip
454	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
455
456config ARCH_NETX
457	bool "Hilscher NetX based"
458	select ARM_VIC
459	select CLKSRC_MMIO
460	select CPU_ARM926T
461	select GENERIC_CLOCKEVENTS
462	help
463	  This enables support for systems based on the Hilscher NetX Soc
464
465config ARCH_IOP13XX
466	bool "IOP13xx-based"
467	depends on MMU
468	select CPU_XSC3
469	select NEED_MACH_MEMORY_H
470	select NEED_RET_TO_USER
471	select PCI
472	select PLAT_IOP
473	select VMSPLIT_1G
474	select SPARSE_IRQ
475	help
476	  Support for Intel's IOP13XX (XScale) family of processors.
477
478config ARCH_IOP32X
479	bool "IOP32x-based"
480	depends on MMU
481	select ARCH_REQUIRE_GPIOLIB
482	select CPU_XSCALE
483	select GPIO_IOP
484	select NEED_RET_TO_USER
485	select PCI
486	select PLAT_IOP
487	help
488	  Support for Intel's 80219 and IOP32X (XScale) family of
489	  processors.
490
491config ARCH_IOP33X
492	bool "IOP33x-based"
493	depends on MMU
494	select ARCH_REQUIRE_GPIOLIB
495	select CPU_XSCALE
496	select GPIO_IOP
497	select NEED_RET_TO_USER
498	select PCI
499	select PLAT_IOP
500	help
501	  Support for Intel's IOP33X (XScale) family of processors.
502
503config ARCH_IXP4XX
504	bool "IXP4xx-based"
505	depends on MMU
506	select ARCH_HAS_DMA_SET_COHERENT_MASK
507	select ARCH_REQUIRE_GPIOLIB
508	select ARCH_SUPPORTS_BIG_ENDIAN
509	select CLKSRC_MMIO
510	select CPU_XSCALE
511	select DMABOUNCE if PCI
512	select GENERIC_CLOCKEVENTS
513	select MIGHT_HAVE_PCI
514	select NEED_MACH_IO_H
515	select USB_EHCI_BIG_ENDIAN_DESC
516	select USB_EHCI_BIG_ENDIAN_MMIO
517	help
518	  Support for Intel's IXP4XX (XScale) family of processors.
519
520config ARCH_DOVE
521	bool "Marvell Dove"
522	select ARCH_REQUIRE_GPIOLIB
523	select CPU_PJ4
524	select GENERIC_CLOCKEVENTS
525	select MIGHT_HAVE_PCI
526	select MVEBU_MBUS
527	select PINCTRL
528	select PINCTRL_DOVE
529	select PLAT_ORION_LEGACY
530	help
531	  Support for the Marvell Dove SoC 88AP510
532
533config ARCH_MV78XX0
534	bool "Marvell MV78xx0"
535	select ARCH_REQUIRE_GPIOLIB
536	select CPU_FEROCEON
537	select GENERIC_CLOCKEVENTS
538	select MVEBU_MBUS
539	select PCI
540	select PLAT_ORION_LEGACY
541	help
542	  Support for the following Marvell MV78xx0 series SoCs:
543	  MV781x0, MV782x0.
544
545config ARCH_ORION5X
546	bool "Marvell Orion"
547	depends on MMU
548	select ARCH_REQUIRE_GPIOLIB
549	select CPU_FEROCEON
550	select GENERIC_CLOCKEVENTS
551	select MVEBU_MBUS
552	select PCI
553	select PLAT_ORION_LEGACY
554	help
555	  Support for the following Marvell Orion 5x series SoCs:
556	  Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
557	  Orion-2 (5281), Orion-1-90 (6183).
558
559config ARCH_MMP
560	bool "Marvell PXA168/910/MMP2"
561	depends on MMU
562	select ARCH_REQUIRE_GPIOLIB
563	select CLKDEV_LOOKUP
564	select GENERIC_ALLOCATOR
565	select GENERIC_CLOCKEVENTS
566	select GPIO_PXA
567	select IRQ_DOMAIN
568	select MULTI_IRQ_HANDLER
569	select PINCTRL
570	select PLAT_PXA
571	select SPARSE_IRQ
572	help
573	  Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
574
575config ARCH_KS8695
576	bool "Micrel/Kendin KS8695"
577	select ARCH_REQUIRE_GPIOLIB
578	select CLKSRC_MMIO
579	select CPU_ARM922T
580	select GENERIC_CLOCKEVENTS
581	select NEED_MACH_MEMORY_H
582	help
583	  Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
584	  System-on-Chip devices.
585
586config ARCH_W90X900
587	bool "Nuvoton W90X900 CPU"
588	select ARCH_REQUIRE_GPIOLIB
589	select CLKDEV_LOOKUP
590	select CLKSRC_MMIO
591	select CPU_ARM926T
592	select GENERIC_CLOCKEVENTS
593	help
594	  Support for Nuvoton (Winbond logic dept.) ARM9 processor,
595	  At present, the w90x900 has been renamed nuc900, regarding
596	  the ARM series product line, you can login the following
597	  link address to know more.
598
599	  <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
600		ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
601
602config ARCH_LPC32XX
603	bool "NXP LPC32XX"
604	select ARCH_REQUIRE_GPIOLIB
605	select ARM_AMBA
606	select CLKDEV_LOOKUP
607	select CLKSRC_MMIO
608	select CPU_ARM926T
609	select GENERIC_CLOCKEVENTS
610	select HAVE_IDE
611	select USE_OF
612	help
613	  Support for the NXP LPC32XX family of processors
614
615config ARCH_PXA
616	bool "PXA2xx/PXA3xx-based"
617	depends on MMU
618	select ARCH_MTD_XIP
619	select ARCH_REQUIRE_GPIOLIB
620	select ARM_CPU_SUSPEND if PM
621	select AUTO_ZRELADDR
622	select CLKDEV_LOOKUP
623	select CLKSRC_MMIO
624	select CLKSRC_OF
625	select GENERIC_CLOCKEVENTS
626	select GPIO_PXA
627	select HAVE_IDE
628	select IRQ_DOMAIN
629	select MULTI_IRQ_HANDLER
630	select PLAT_PXA
631	select SPARSE_IRQ
632	help
633	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
634
635config ARCH_MSM
636	bool "Qualcomm MSM (non-multiplatform)"
637	select ARCH_REQUIRE_GPIOLIB
638	select COMMON_CLK
639	select GENERIC_CLOCKEVENTS
640	help
641	  Support for Qualcomm MSM/QSD based systems.  This runs on the
642	  apps processor of the MSM/QSD and depends on a shared memory
643	  interface to the modem processor which runs the baseband
644	  stack and controls some vital subsystems
645	  (clock and power control, etc).
646
647config ARCH_SHMOBILE_LEGACY
648	bool "Renesas ARM SoCs (non-multiplatform)"
649	select ARCH_SHMOBILE
650	select ARM_PATCH_PHYS_VIRT if MMU
651	select CLKDEV_LOOKUP
652	select CPU_V7
653	select GENERIC_CLOCKEVENTS
654	select HAVE_ARM_SCU if SMP
655	select HAVE_ARM_TWD if SMP
656	select HAVE_MACH_CLKDEV
657	select HAVE_SMP
658	select MIGHT_HAVE_CACHE_L2X0
659	select MULTI_IRQ_HANDLER
660	select NO_IOPORT_MAP
661	select PINCTRL
662	select PM_GENERIC_DOMAINS if PM
663	select SH_CLK_CPG
664	select SPARSE_IRQ
665	help
666	  Support for Renesas ARM SoC platforms using a non-multiplatform
667	  kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
668	  and RZ families.
669
670config ARCH_RPC
671	bool "RiscPC"
672	select ARCH_ACORN
673	select ARCH_MAY_HAVE_PC_FDC
674	select ARCH_SPARSEMEM_ENABLE
675	select ARCH_USES_GETTIMEOFFSET
676	select CPU_SA110
677	select FIQ
678	select HAVE_IDE
679	select HAVE_PATA_PLATFORM
680	select ISA_DMA_API
681	select NEED_MACH_IO_H
682	select NEED_MACH_MEMORY_H
683	select NO_IOPORT_MAP
684	select VIRT_TO_BUS
685	help
686	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
687	  CD-ROM interface, serial and parallel port, and the floppy drive.
688
689config ARCH_SA1100
690	bool "SA1100-based"
691	select ARCH_MTD_XIP
692	select ARCH_REQUIRE_GPIOLIB
693	select ARCH_SPARSEMEM_ENABLE
694	select CLKDEV_LOOKUP
695	select CLKSRC_MMIO
696	select CPU_FREQ
697	select CPU_SA1100
698	select GENERIC_CLOCKEVENTS
699	select HAVE_IDE
700	select IRQ_DOMAIN
701	select ISA
702	select MULTI_IRQ_HANDLER
703	select NEED_MACH_MEMORY_H
704	select SPARSE_IRQ
705	help
706	  Support for StrongARM 11x0 based boards.
707
708config ARCH_S3C24XX
709	bool "Samsung S3C24XX SoCs"
710	select ARCH_REQUIRE_GPIOLIB
711	select ATAGS
712	select CLKDEV_LOOKUP
713	select CLKSRC_SAMSUNG_PWM
714	select GENERIC_CLOCKEVENTS
715	select GPIO_SAMSUNG
716	select HAVE_S3C2410_I2C if I2C
717	select HAVE_S3C2410_WATCHDOG if WATCHDOG
718	select HAVE_S3C_RTC if RTC_CLASS
719	select MULTI_IRQ_HANDLER
720	select NEED_MACH_IO_H
721	select SAMSUNG_ATAGS
722	help
723	  Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
724	  and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
725	  (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
726	  Samsung SMDK2410 development board (and derivatives).
727
728config ARCH_S3C64XX
729	bool "Samsung S3C64XX"
730	select ARCH_REQUIRE_GPIOLIB
731	select ARM_AMBA
732	select ARM_VIC
733	select ATAGS
734	select CLKDEV_LOOKUP
735	select CLKSRC_SAMSUNG_PWM
736	select COMMON_CLK_SAMSUNG
737	select CPU_V6K
738	select GENERIC_CLOCKEVENTS
739	select GPIO_SAMSUNG
740	select HAVE_S3C2410_I2C if I2C
741	select HAVE_S3C2410_WATCHDOG if WATCHDOG
742	select HAVE_TCM
743	select NO_IOPORT_MAP
744	select PLAT_SAMSUNG
745	select PM_GENERIC_DOMAINS if PM
746	select S3C_DEV_NAND
747	select S3C_GPIO_TRACK
748	select SAMSUNG_ATAGS
749	select SAMSUNG_WAKEMASK
750	select SAMSUNG_WDT_RESET
751	help
752	  Samsung S3C64XX series based systems
753
754config ARCH_DAVINCI
755	bool "TI DaVinci"
756	select ARCH_HAS_HOLES_MEMORYMODEL
757	select ARCH_REQUIRE_GPIOLIB
758	select CLKDEV_LOOKUP
759	select GENERIC_ALLOCATOR
760	select GENERIC_CLOCKEVENTS
761	select GENERIC_IRQ_CHIP
762	select HAVE_IDE
763	select TI_PRIV_EDMA
764	select USE_OF
765	select ZONE_DMA
766	help
767	  Support for TI's DaVinci platform.
768
769config ARCH_OMAP1
770	bool "TI OMAP1"
771	depends on MMU
772	select ARCH_HAS_HOLES_MEMORYMODEL
773	select ARCH_OMAP
774	select ARCH_REQUIRE_GPIOLIB
775	select CLKDEV_LOOKUP
776	select CLKSRC_MMIO
777	select GENERIC_CLOCKEVENTS
778	select GENERIC_IRQ_CHIP
779	select HAVE_IDE
780	select IRQ_DOMAIN
781	select NEED_MACH_IO_H if PCCARD
782	select NEED_MACH_MEMORY_H
783	help
784	  Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
785
786endchoice
787
788menu "Multiple platform selection"
789	depends on ARCH_MULTIPLATFORM
790
791comment "CPU Core family selection"
792
793config ARCH_MULTI_V4
794	bool "ARMv4 based platforms (FA526)"
795	depends on !ARCH_MULTI_V6_V7
796	select ARCH_MULTI_V4_V5
797	select CPU_FA526
798
799config ARCH_MULTI_V4T
800	bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
801	depends on !ARCH_MULTI_V6_V7
802	select ARCH_MULTI_V4_V5
803	select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
804		CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
805		CPU_ARM925T || CPU_ARM940T)
806
807config ARCH_MULTI_V5
808	bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
809	depends on !ARCH_MULTI_V6_V7
810	select ARCH_MULTI_V4_V5
811	select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
812		CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
813		CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
814
815config ARCH_MULTI_V4_V5
816	bool
817
818config ARCH_MULTI_V6
819	bool "ARMv6 based platforms (ARM11)"
820	select ARCH_MULTI_V6_V7
821	select CPU_V6K
822
823config ARCH_MULTI_V7
824	bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
825	default y
826	select ARCH_MULTI_V6_V7
827	select CPU_V7
828	select HAVE_SMP
829
830config ARCH_MULTI_V6_V7
831	bool
832	select MIGHT_HAVE_CACHE_L2X0
833
834config ARCH_MULTI_CPU_AUTO
835	def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
836	select ARCH_MULTI_V5
837
838endmenu
839
840config ARCH_VIRT
841	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
842	select ARM_AMBA
843	select ARM_GIC
844	select ARM_PSCI
845	select HAVE_ARM_ARCH_TIMER
846
847#
848# This is sorted alphabetically by mach-* pathname.  However, plat-*
849# Kconfigs may be included either alphabetically (according to the
850# plat- suffix) or along side the corresponding mach-* source.
851#
852source "arch/arm/mach-mvebu/Kconfig"
853
854source "arch/arm/mach-asm9260/Kconfig"
855
856source "arch/arm/mach-at91/Kconfig"
857
858source "arch/arm/mach-axxia/Kconfig"
859
860source "arch/arm/mach-bcm/Kconfig"
861
862source "arch/arm/mach-berlin/Kconfig"
863
864source "arch/arm/mach-clps711x/Kconfig"
865
866source "arch/arm/mach-cns3xxx/Kconfig"
867
868source "arch/arm/mach-davinci/Kconfig"
869
870source "arch/arm/mach-digicolor/Kconfig"
871
872source "arch/arm/mach-dove/Kconfig"
873
874source "arch/arm/mach-ep93xx/Kconfig"
875
876source "arch/arm/mach-footbridge/Kconfig"
877
878source "arch/arm/mach-gemini/Kconfig"
879
880source "arch/arm/mach-highbank/Kconfig"
881
882source "arch/arm/mach-hisi/Kconfig"
883
884source "arch/arm/mach-integrator/Kconfig"
885
886source "arch/arm/mach-iop32x/Kconfig"
887
888source "arch/arm/mach-iop33x/Kconfig"
889
890source "arch/arm/mach-iop13xx/Kconfig"
891
892source "arch/arm/mach-ixp4xx/Kconfig"
893
894source "arch/arm/mach-keystone/Kconfig"
895
896source "arch/arm/mach-ks8695/Kconfig"
897
898source "arch/arm/mach-meson/Kconfig"
899
900source "arch/arm/mach-msm/Kconfig"
901
902source "arch/arm/mach-moxart/Kconfig"
903
904source "arch/arm/mach-mv78xx0/Kconfig"
905
906source "arch/arm/mach-imx/Kconfig"
907
908source "arch/arm/mach-mediatek/Kconfig"
909
910source "arch/arm/mach-mxs/Kconfig"
911
912source "arch/arm/mach-netx/Kconfig"
913
914source "arch/arm/mach-nomadik/Kconfig"
915
916source "arch/arm/mach-nspire/Kconfig"
917
918source "arch/arm/plat-omap/Kconfig"
919
920source "arch/arm/mach-omap1/Kconfig"
921
922source "arch/arm/mach-omap2/Kconfig"
923
924source "arch/arm/mach-orion5x/Kconfig"
925
926source "arch/arm/mach-picoxcell/Kconfig"
927
928source "arch/arm/mach-pxa/Kconfig"
929source "arch/arm/plat-pxa/Kconfig"
930
931source "arch/arm/mach-mmp/Kconfig"
932
933source "arch/arm/mach-qcom/Kconfig"
934
935source "arch/arm/mach-realview/Kconfig"
936
937source "arch/arm/mach-rockchip/Kconfig"
938
939source "arch/arm/mach-sa1100/Kconfig"
940
941source "arch/arm/mach-socfpga/Kconfig"
942
943source "arch/arm/mach-spear/Kconfig"
944
945source "arch/arm/mach-sti/Kconfig"
946
947source "arch/arm/mach-s3c24xx/Kconfig"
948
949source "arch/arm/mach-s3c64xx/Kconfig"
950
951source "arch/arm/mach-s5pv210/Kconfig"
952
953source "arch/arm/mach-exynos/Kconfig"
954source "arch/arm/plat-samsung/Kconfig"
955
956source "arch/arm/mach-shmobile/Kconfig"
957
958source "arch/arm/mach-sunxi/Kconfig"
959
960source "arch/arm/mach-prima2/Kconfig"
961
962source "arch/arm/mach-tegra/Kconfig"
963
964source "arch/arm/mach-u300/Kconfig"
965
966source "arch/arm/mach-ux500/Kconfig"
967
968source "arch/arm/mach-versatile/Kconfig"
969
970source "arch/arm/mach-vexpress/Kconfig"
971source "arch/arm/plat-versatile/Kconfig"
972
973source "arch/arm/mach-vt8500/Kconfig"
974
975source "arch/arm/mach-w90x900/Kconfig"
976
977source "arch/arm/mach-zynq/Kconfig"
978
979# Definitions to make life easier
980config ARCH_ACORN
981	bool
982
983config PLAT_IOP
984	bool
985	select GENERIC_CLOCKEVENTS
986
987config PLAT_ORION
988	bool
989	select CLKSRC_MMIO
990	select COMMON_CLK
991	select GENERIC_IRQ_CHIP
992	select IRQ_DOMAIN
993
994config PLAT_ORION_LEGACY
995	bool
996	select PLAT_ORION
997
998config PLAT_PXA
999	bool
1000
1001config PLAT_VERSATILE
1002	bool
1003
1004config ARM_TIMER_SP804
1005	bool
1006	select CLKSRC_MMIO
1007	select CLKSRC_OF if OF
1008
1009source "arch/arm/firmware/Kconfig"
1010
1011source arch/arm/mm/Kconfig
1012
1013config IWMMXT
1014	bool "Enable iWMMXt support"
1015	depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1016	default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1017	help
1018	  Enable support for iWMMXt context switching at run time if
1019	  running on a CPU that supports it.
1020
1021config MULTI_IRQ_HANDLER
1022	bool
1023	help
1024	  Allow each machine to specify it's own IRQ handler at run time.
1025
1026if !MMU
1027source "arch/arm/Kconfig-nommu"
1028endif
1029
1030config PJ4B_ERRATA_4742
1031	bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1032	depends on CPU_PJ4B && MACH_ARMADA_370
1033	default y
1034	help
1035	  When coming out of either a Wait for Interrupt (WFI) or a Wait for
1036	  Event (WFE) IDLE states, a specific timing sensitivity exists between
1037	  the retiring WFI/WFE instructions and the newly issued subsequent
1038	  instructions.  This sensitivity can result in a CPU hang scenario.
1039	  Workaround:
1040	  The software must insert either a Data Synchronization Barrier (DSB)
1041	  or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1042	  instruction
1043
1044config ARM_ERRATA_326103
1045	bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1046	depends on CPU_V6
1047	help
1048	  Executing a SWP instruction to read-only memory does not set bit 11
1049	  of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1050	  treat the access as a read, preventing a COW from occurring and
1051	  causing the faulting task to livelock.
1052
1053config ARM_ERRATA_411920
1054	bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1055	depends on CPU_V6 || CPU_V6K
1056	help
1057	  Invalidation of the Instruction Cache operation can
1058	  fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1059	  It does not affect the MPCore. This option enables the ARM Ltd.
1060	  recommended workaround.
1061
1062config ARM_ERRATA_430973
1063	bool "ARM errata: Stale prediction on replaced interworking branch"
1064	depends on CPU_V7
1065	help
1066	  This option enables the workaround for the 430973 Cortex-A8
1067	  r1p* erratum. If a code sequence containing an ARM/Thumb
1068	  interworking branch is replaced with another code sequence at the
1069	  same virtual address, whether due to self-modifying code or virtual
1070	  to physical address re-mapping, Cortex-A8 does not recover from the
1071	  stale interworking branch prediction. This results in Cortex-A8
1072	  executing the new code sequence in the incorrect ARM or Thumb state.
1073	  The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1074	  and also flushes the branch target cache at every context switch.
1075	  Note that setting specific bits in the ACTLR register may not be
1076	  available in non-secure mode.
1077
1078config ARM_ERRATA_458693
1079	bool "ARM errata: Processor deadlock when a false hazard is created"
1080	depends on CPU_V7
1081	depends on !ARCH_MULTIPLATFORM
1082	help
1083	  This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1084	  erratum. For very specific sequences of memory operations, it is
1085	  possible for a hazard condition intended for a cache line to instead
1086	  be incorrectly associated with a different cache line. This false
1087	  hazard might then cause a processor deadlock. The workaround enables
1088	  the L1 caching of the NEON accesses and disables the PLD instruction
1089	  in the ACTLR register. Note that setting specific bits in the ACTLR
1090	  register may not be available in non-secure mode.
1091
1092config ARM_ERRATA_460075
1093	bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1094	depends on CPU_V7
1095	depends on !ARCH_MULTIPLATFORM
1096	help
1097	  This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1098	  erratum. Any asynchronous access to the L2 cache may encounter a
1099	  situation in which recent store transactions to the L2 cache are lost
1100	  and overwritten with stale memory contents from external memory. The
1101	  workaround disables the write-allocate mode for the L2 cache via the
1102	  ACTLR register. Note that setting specific bits in the ACTLR register
1103	  may not be available in non-secure mode.
1104
1105config ARM_ERRATA_742230
1106	bool "ARM errata: DMB operation may be faulty"
1107	depends on CPU_V7 && SMP
1108	depends on !ARCH_MULTIPLATFORM
1109	help
1110	  This option enables the workaround for the 742230 Cortex-A9
1111	  (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1112	  between two write operations may not ensure the correct visibility
1113	  ordering of the two writes. This workaround sets a specific bit in
1114	  the diagnostic register of the Cortex-A9 which causes the DMB
1115	  instruction to behave as a DSB, ensuring the correct behaviour of
1116	  the two writes.
1117
1118config ARM_ERRATA_742231
1119	bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1120	depends on CPU_V7 && SMP
1121	depends on !ARCH_MULTIPLATFORM
1122	help
1123	  This option enables the workaround for the 742231 Cortex-A9
1124	  (r2p0..r2p2) erratum. Under certain conditions, specific to the
1125	  Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1126	  accessing some data located in the same cache line, may get corrupted
1127	  data due to bad handling of the address hazard when the line gets
1128	  replaced from one of the CPUs at the same time as another CPU is
1129	  accessing it. This workaround sets specific bits in the diagnostic
1130	  register of the Cortex-A9 which reduces the linefill issuing
1131	  capabilities of the processor.
1132
1133config ARM_ERRATA_643719
1134	bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1135	depends on CPU_V7 && SMP
1136	default y
1137	help
1138	  This option enables the workaround for the 643719 Cortex-A9 (prior to
1139	  r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1140	  register returns zero when it should return one. The workaround
1141	  corrects this value, ensuring cache maintenance operations which use
1142	  it behave as intended and avoiding data corruption.
1143
1144config ARM_ERRATA_720789
1145	bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1146	depends on CPU_V7
1147	help
1148	  This option enables the workaround for the 720789 Cortex-A9 (prior to
1149	  r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1150	  broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1151	  As a consequence of this erratum, some TLB entries which should be
1152	  invalidated are not, resulting in an incoherency in the system page
1153	  tables. The workaround changes the TLB flushing routines to invalidate
1154	  entries regardless of the ASID.
1155
1156config ARM_ERRATA_743622
1157	bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1158	depends on CPU_V7
1159	depends on !ARCH_MULTIPLATFORM
1160	help
1161	  This option enables the workaround for the 743622 Cortex-A9
1162	  (r2p*) erratum. Under very rare conditions, a faulty
1163	  optimisation in the Cortex-A9 Store Buffer may lead to data
1164	  corruption. This workaround sets a specific bit in the diagnostic
1165	  register of the Cortex-A9 which disables the Store Buffer
1166	  optimisation, preventing the defect from occurring. This has no
1167	  visible impact on the overall performance or power consumption of the
1168	  processor.
1169
1170config ARM_ERRATA_751472
1171	bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1172	depends on CPU_V7
1173	depends on !ARCH_MULTIPLATFORM
1174	help
1175	  This option enables the workaround for the 751472 Cortex-A9 (prior
1176	  to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1177	  completion of a following broadcasted operation if the second
1178	  operation is received by a CPU before the ICIALLUIS has completed,
1179	  potentially leading to corrupted entries in the cache or TLB.
1180
1181config ARM_ERRATA_754322
1182	bool "ARM errata: possible faulty MMU translations following an ASID switch"
1183	depends on CPU_V7
1184	help
1185	  This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1186	  r3p*) erratum. A speculative memory access may cause a page table walk
1187	  which starts prior to an ASID switch but completes afterwards. This
1188	  can populate the micro-TLB with a stale entry which may be hit with
1189	  the new ASID. This workaround places two dsb instructions in the mm
1190	  switching code so that no page table walks can cross the ASID switch.
1191
1192config ARM_ERRATA_754327
1193	bool "ARM errata: no automatic Store Buffer drain"
1194	depends on CPU_V7 && SMP
1195	help
1196	  This option enables the workaround for the 754327 Cortex-A9 (prior to
1197	  r2p0) erratum. The Store Buffer does not have any automatic draining
1198	  mechanism and therefore a livelock may occur if an external agent
1199	  continuously polls a memory location waiting to observe an update.
1200	  This workaround defines cpu_relax() as smp_mb(), preventing correctly
1201	  written polling loops from denying visibility of updates to memory.
1202
1203config ARM_ERRATA_364296
1204	bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1205	depends on CPU_V6
1206	help
1207	  This options enables the workaround for the 364296 ARM1136
1208	  r0p2 erratum (possible cache data corruption with
1209	  hit-under-miss enabled). It sets the undocumented bit 31 in
1210	  the auxiliary control register and the FI bit in the control
1211	  register, thus disabling hit-under-miss without putting the
1212	  processor into full low interrupt latency mode. ARM11MPCore
1213	  is not affected.
1214
1215config ARM_ERRATA_764369
1216	bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1217	depends on CPU_V7 && SMP
1218	help
1219	  This option enables the workaround for erratum 764369
1220	  affecting Cortex-A9 MPCore with two or more processors (all
1221	  current revisions). Under certain timing circumstances, a data
1222	  cache line maintenance operation by MVA targeting an Inner
1223	  Shareable memory region may fail to proceed up to either the
1224	  Point of Coherency or to the Point of Unification of the
1225	  system. This workaround adds a DSB instruction before the
1226	  relevant cache maintenance functions and sets a specific bit
1227	  in the diagnostic control register of the SCU.
1228
1229config ARM_ERRATA_775420
1230       bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1231       depends on CPU_V7
1232       help
1233	 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1234	 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1235	 operation aborts with MMU exception, it might cause the processor
1236	 to deadlock. This workaround puts DSB before executing ISB if
1237	 an abort may occur on cache maintenance.
1238
1239config ARM_ERRATA_798181
1240	bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1241	depends on CPU_V7 && SMP
1242	help
1243	  On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1244	  adequately shooting down all use of the old entries. This
1245	  option enables the Linux kernel workaround for this erratum
1246	  which sends an IPI to the CPUs that are running the same ASID
1247	  as the one being invalidated.
1248
1249config ARM_ERRATA_773022
1250	bool "ARM errata: incorrect instructions may be executed from loop buffer"
1251	depends on CPU_V7
1252	help
1253	  This option enables the workaround for the 773022 Cortex-A15
1254	  (up to r0p4) erratum. In certain rare sequences of code, the
1255	  loop buffer may deliver incorrect instructions. This
1256	  workaround disables the loop buffer to avoid the erratum.
1257
1258endmenu
1259
1260source "arch/arm/common/Kconfig"
1261
1262menu "Bus support"
1263
1264config ISA
1265	bool
1266	help
1267	  Find out whether you have ISA slots on your motherboard.  ISA is the
1268	  name of a bus system, i.e. the way the CPU talks to the other stuff
1269	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
1270	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1271	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
1272
1273# Select ISA DMA controller support
1274config ISA_DMA
1275	bool
1276	select ISA_DMA_API
1277
1278# Select ISA DMA interface
1279config ISA_DMA_API
1280	bool
1281
1282config PCI
1283	bool "PCI support" if MIGHT_HAVE_PCI
1284	help
1285	  Find out whether you have a PCI motherboard. PCI is the name of a
1286	  bus system, i.e. the way the CPU talks to the other stuff inside
1287	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1288	  VESA. If you have PCI, say Y, otherwise N.
1289
1290config PCI_DOMAINS
1291	bool
1292	depends on PCI
1293
1294config PCI_DOMAINS_GENERIC
1295	def_bool PCI_DOMAINS
1296
1297config PCI_NANOENGINE
1298	bool "BSE nanoEngine PCI support"
1299	depends on SA1100_NANOENGINE
1300	help
1301	  Enable PCI on the BSE nanoEngine board.
1302
1303config PCI_SYSCALL
1304	def_bool PCI
1305
1306config PCI_HOST_ITE8152
1307	bool
1308	depends on PCI && MACH_ARMCORE
1309	default y
1310	select DMABOUNCE
1311
1312source "drivers/pci/Kconfig"
1313source "drivers/pci/pcie/Kconfig"
1314
1315source "drivers/pcmcia/Kconfig"
1316
1317endmenu
1318
1319menu "Kernel Features"
1320
1321config HAVE_SMP
1322	bool
1323	help
1324	  This option should be selected by machines which have an SMP-
1325	  capable CPU.
1326
1327	  The only effect of this option is to make the SMP-related
1328	  options available to the user for configuration.
1329
1330config SMP
1331	bool "Symmetric Multi-Processing"
1332	depends on CPU_V6K || CPU_V7
1333	depends on GENERIC_CLOCKEVENTS
1334	depends on HAVE_SMP
1335	depends on MMU || ARM_MPU
1336	help
1337	  This enables support for systems with more than one CPU. If you have
1338	  a system with only one CPU, say N. If you have a system with more
1339	  than one CPU, say Y.
1340
1341	  If you say N here, the kernel will run on uni- and multiprocessor
1342	  machines, but will use only one CPU of a multiprocessor machine. If
1343	  you say Y here, the kernel will run on many, but not all,
1344	  uniprocessor machines. On a uniprocessor machine, the kernel
1345	  will run faster if you say N here.
1346
1347	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
1348	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1349	  <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1350
1351	  If you don't know what to do here, say N.
1352
1353config SMP_ON_UP
1354	bool "Allow booting SMP kernel on uniprocessor systems"
1355	depends on SMP && !XIP_KERNEL && MMU
1356	default y
1357	help
1358	  SMP kernels contain instructions which fail on non-SMP processors.
1359	  Enabling this option allows the kernel to modify itself to make
1360	  these instructions safe.  Disabling it allows about 1K of space
1361	  savings.
1362
1363	  If you don't know what to do here, say Y.
1364
1365config ARM_CPU_TOPOLOGY
1366	bool "Support cpu topology definition"
1367	depends on SMP && CPU_V7
1368	default y
1369	help
1370	  Support ARM cpu topology definition. The MPIDR register defines
1371	  affinity between processors which is then used to describe the cpu
1372	  topology of an ARM System.
1373
1374config SCHED_MC
1375	bool "Multi-core scheduler support"
1376	depends on ARM_CPU_TOPOLOGY
1377	help
1378	  Multi-core scheduler support improves the CPU scheduler's decision
1379	  making when dealing with multi-core CPU chips at a cost of slightly
1380	  increased overhead in some places. If unsure say N here.
1381
1382config SCHED_SMT
1383	bool "SMT scheduler support"
1384	depends on ARM_CPU_TOPOLOGY
1385	help
1386	  Improves the CPU scheduler's decision making when dealing with
1387	  MultiThreading at a cost of slightly increased overhead in some
1388	  places. If unsure say N here.
1389
1390config HAVE_ARM_SCU
1391	bool
1392	help
1393	  This option enables support for the ARM system coherency unit
1394
1395config HAVE_ARM_ARCH_TIMER
1396	bool "Architected timer support"
1397	depends on CPU_V7
1398	select ARM_ARCH_TIMER
1399	select GENERIC_CLOCKEVENTS
1400	help
1401	  This option enables support for the ARM architected timer
1402
1403config HAVE_ARM_TWD
1404	bool
1405	depends on SMP
1406	select CLKSRC_OF if OF
1407	help
1408	  This options enables support for the ARM timer and watchdog unit
1409
1410config MCPM
1411	bool "Multi-Cluster Power Management"
1412	depends on CPU_V7 && SMP
1413	help
1414	  This option provides the common power management infrastructure
1415	  for (multi-)cluster based systems, such as big.LITTLE based
1416	  systems.
1417
1418config MCPM_QUAD_CLUSTER
1419	bool
1420	depends on MCPM
1421	help
1422	  To avoid wasting resources unnecessarily, MCPM only supports up
1423	  to 2 clusters by default.
1424	  Platforms with 3 or 4 clusters that use MCPM must select this
1425	  option to allow the additional clusters to be managed.
1426
1427config BIG_LITTLE
1428	bool "big.LITTLE support (Experimental)"
1429	depends on CPU_V7 && SMP
1430	select MCPM
1431	help
1432	  This option enables support selections for the big.LITTLE
1433	  system architecture.
1434
1435config BL_SWITCHER
1436	bool "big.LITTLE switcher support"
1437	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1438	select ARM_CPU_SUSPEND
1439	select CPU_PM
1440	help
1441	  The big.LITTLE "switcher" provides the core functionality to
1442	  transparently handle transition between a cluster of A15's
1443	  and a cluster of A7's in a big.LITTLE system.
1444
1445config BL_SWITCHER_DUMMY_IF
1446	tristate "Simple big.LITTLE switcher user interface"
1447	depends on BL_SWITCHER && DEBUG_KERNEL
1448	help
1449	  This is a simple and dummy char dev interface to control
1450	  the big.LITTLE switcher core code.  It is meant for
1451	  debugging purposes only.
1452
1453choice
1454	prompt "Memory split"
1455	depends on MMU
1456	default VMSPLIT_3G
1457	help
1458	  Select the desired split between kernel and user memory.
1459
1460	  If you are not absolutely sure what you are doing, leave this
1461	  option alone!
1462
1463	config VMSPLIT_3G
1464		bool "3G/1G user/kernel split"
1465	config VMSPLIT_2G
1466		bool "2G/2G user/kernel split"
1467	config VMSPLIT_1G
1468		bool "1G/3G user/kernel split"
1469endchoice
1470
1471config PAGE_OFFSET
1472	hex
1473	default PHYS_OFFSET if !MMU
1474	default 0x40000000 if VMSPLIT_1G
1475	default 0x80000000 if VMSPLIT_2G
1476	default 0xC0000000
1477
1478config NR_CPUS
1479	int "Maximum number of CPUs (2-32)"
1480	range 2 32
1481	depends on SMP
1482	default "4"
1483
1484config HOTPLUG_CPU
1485	bool "Support for hot-pluggable CPUs"
1486	depends on SMP
1487	help
1488	  Say Y here to experiment with turning CPUs off and on.  CPUs
1489	  can be controlled through /sys/devices/system/cpu.
1490
1491config ARM_PSCI
1492	bool "Support for the ARM Power State Coordination Interface (PSCI)"
1493	depends on CPU_V7
1494	help
1495	  Say Y here if you want Linux to communicate with system firmware
1496	  implementing the PSCI specification for CPU-centric power
1497	  management operations described in ARM document number ARM DEN
1498	  0022A ("Power State Coordination Interface System Software on
1499	  ARM processors").
1500
1501# The GPIO number here must be sorted by descending number. In case of
1502# a multiplatform kernel, we just want the highest value required by the
1503# selected platforms.
1504config ARCH_NR_GPIO
1505	int
1506	default 1024 if ARCH_SHMOBILE || ARCH_TEGRA || ARCH_ZYNQ
1507	default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1508		SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1509	default 416 if ARCH_SUNXI
1510	default 392 if ARCH_U8500
1511	default 352 if ARCH_VT8500
1512	default 288 if ARCH_ROCKCHIP
1513	default 264 if MACH_H4700
1514	default 0
1515	help
1516	  Maximum number of GPIOs in the system.
1517
1518	  If unsure, leave the default value.
1519
1520source kernel/Kconfig.preempt
1521
1522config HZ_FIXED
1523	int
1524	default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1525		ARCH_S5PV210 || ARCH_EXYNOS4
1526	default AT91_TIMER_HZ if ARCH_AT91
1527	default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1528	default 0
1529
1530choice
1531	depends on HZ_FIXED = 0
1532	prompt "Timer frequency"
1533
1534config HZ_100
1535	bool "100 Hz"
1536
1537config HZ_200
1538	bool "200 Hz"
1539
1540config HZ_250
1541	bool "250 Hz"
1542
1543config HZ_300
1544	bool "300 Hz"
1545
1546config HZ_500
1547	bool "500 Hz"
1548
1549config HZ_1000
1550	bool "1000 Hz"
1551
1552endchoice
1553
1554config HZ
1555	int
1556	default HZ_FIXED if HZ_FIXED != 0
1557	default 100 if HZ_100
1558	default 200 if HZ_200
1559	default 250 if HZ_250
1560	default 300 if HZ_300
1561	default 500 if HZ_500
1562	default 1000
1563
1564config SCHED_HRTICK
1565	def_bool HIGH_RES_TIMERS
1566
1567config THUMB2_KERNEL
1568	bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1569	depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1570	default y if CPU_THUMBONLY
1571	select AEABI
1572	select ARM_ASM_UNIFIED
1573	select ARM_UNWIND
1574	help
1575	  By enabling this option, the kernel will be compiled in
1576	  Thumb-2 mode. A compiler/assembler that understand the unified
1577	  ARM-Thumb syntax is needed.
1578
1579	  If unsure, say N.
1580
1581config THUMB2_AVOID_R_ARM_THM_JUMP11
1582	bool "Work around buggy Thumb-2 short branch relocations in gas"
1583	depends on THUMB2_KERNEL && MODULES
1584	default y
1585	help
1586	  Various binutils versions can resolve Thumb-2 branches to
1587	  locally-defined, preemptible global symbols as short-range "b.n"
1588	  branch instructions.
1589
1590	  This is a problem, because there's no guarantee the final
1591	  destination of the symbol, or any candidate locations for a
1592	  trampoline, are within range of the branch.  For this reason, the
1593	  kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1594	  relocation in modules at all, and it makes little sense to add
1595	  support.
1596
1597	  The symptom is that the kernel fails with an "unsupported
1598	  relocation" error when loading some modules.
1599
1600	  Until fixed tools are available, passing
1601	  -fno-optimize-sibling-calls to gcc should prevent gcc generating
1602	  code which hits this problem, at the cost of a bit of extra runtime
1603	  stack usage in some cases.
1604
1605	  The problem is described in more detail at:
1606	      https://bugs.launchpad.net/binutils-linaro/+bug/725126
1607
1608	  Only Thumb-2 kernels are affected.
1609
1610	  Unless you are sure your tools don't have this problem, say Y.
1611
1612config ARM_ASM_UNIFIED
1613	bool
1614
1615config AEABI
1616	bool "Use the ARM EABI to compile the kernel"
1617	help
1618	  This option allows for the kernel to be compiled using the latest
1619	  ARM ABI (aka EABI).  This is only useful if you are using a user
1620	  space environment that is also compiled with EABI.
1621
1622	  Since there are major incompatibilities between the legacy ABI and
1623	  EABI, especially with regard to structure member alignment, this
1624	  option also changes the kernel syscall calling convention to
1625	  disambiguate both ABIs and allow for backward compatibility support
1626	  (selected with CONFIG_OABI_COMPAT).
1627
1628	  To use this you need GCC version 4.0.0 or later.
1629
1630config OABI_COMPAT
1631	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1632	depends on AEABI && !THUMB2_KERNEL
1633	help
1634	  This option preserves the old syscall interface along with the
1635	  new (ARM EABI) one. It also provides a compatibility layer to
1636	  intercept syscalls that have structure arguments which layout
1637	  in memory differs between the legacy ABI and the new ARM EABI
1638	  (only for non "thumb" binaries). This option adds a tiny
1639	  overhead to all syscalls and produces a slightly larger kernel.
1640
1641	  The seccomp filter system will not be available when this is
1642	  selected, since there is no way yet to sensibly distinguish
1643	  between calling conventions during filtering.
1644
1645	  If you know you'll be using only pure EABI user space then you
1646	  can say N here. If this option is not selected and you attempt
1647	  to execute a legacy ABI binary then the result will be
1648	  UNPREDICTABLE (in fact it can be predicted that it won't work
1649	  at all). If in doubt say N.
1650
1651config ARCH_HAS_HOLES_MEMORYMODEL
1652	bool
1653
1654config ARCH_SPARSEMEM_ENABLE
1655	bool
1656
1657config ARCH_SPARSEMEM_DEFAULT
1658	def_bool ARCH_SPARSEMEM_ENABLE
1659
1660config ARCH_SELECT_MEMORY_MODEL
1661	def_bool ARCH_SPARSEMEM_ENABLE
1662
1663config HAVE_ARCH_PFN_VALID
1664	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1665
1666config HAVE_GENERIC_RCU_GUP
1667	def_bool y
1668	depends on ARM_LPAE
1669
1670config HIGHMEM
1671	bool "High Memory Support"
1672	depends on MMU
1673	help
1674	  The address space of ARM processors is only 4 Gigabytes large
1675	  and it has to accommodate user address space, kernel address
1676	  space as well as some memory mapped IO. That means that, if you
1677	  have a large amount of physical memory and/or IO, not all of the
1678	  memory can be "permanently mapped" by the kernel. The physical
1679	  memory that is not permanently mapped is called "high memory".
1680
1681	  Depending on the selected kernel/user memory split, minimum
1682	  vmalloc space and actual amount of RAM, you may not need this
1683	  option which should result in a slightly faster kernel.
1684
1685	  If unsure, say n.
1686
1687config HIGHPTE
1688	bool "Allocate 2nd-level pagetables from highmem"
1689	depends on HIGHMEM
1690
1691config HW_PERF_EVENTS
1692	bool "Enable hardware performance counter support for perf events"
1693	depends on PERF_EVENTS
1694	default y
1695	help
1696	  Enable hardware performance counter support for perf events. If
1697	  disabled, perf events will use software events only.
1698
1699config SYS_SUPPORTS_HUGETLBFS
1700       def_bool y
1701       depends on ARM_LPAE
1702
1703config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1704       def_bool y
1705       depends on ARM_LPAE
1706
1707config ARCH_WANT_GENERAL_HUGETLB
1708	def_bool y
1709
1710source "mm/Kconfig"
1711
1712config FORCE_MAX_ZONEORDER
1713	int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1714	range 11 64 if ARCH_SHMOBILE_LEGACY
1715	default "12" if SOC_AM33XX
1716	default "9" if SA1111 || ARCH_EFM32
1717	default "11"
1718	help
1719	  The kernel memory allocator divides physically contiguous memory
1720	  blocks into "zones", where each zone is a power of two number of
1721	  pages.  This option selects the largest power of two that the kernel
1722	  keeps in the memory allocator.  If you need to allocate very large
1723	  blocks of physically contiguous memory, then you may need to
1724	  increase this value.
1725
1726	  This config option is actually maximum order plus one. For example,
1727	  a value of 11 means that the largest free memory block is 2^10 pages.
1728
1729config ALIGNMENT_TRAP
1730	bool
1731	depends on CPU_CP15_MMU
1732	default y if !ARCH_EBSA110
1733	select HAVE_PROC_CPU if PROC_FS
1734	help
1735	  ARM processors cannot fetch/store information which is not
1736	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1737	  address divisible by 4. On 32-bit ARM processors, these non-aligned
1738	  fetch/store instructions will be emulated in software if you say
1739	  here, which has a severe performance impact. This is necessary for
1740	  correct operation of some network protocols. With an IP-only
1741	  configuration it is safe to say N, otherwise say Y.
1742
1743config UACCESS_WITH_MEMCPY
1744	bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1745	depends on MMU
1746	default y if CPU_FEROCEON
1747	help
1748	  Implement faster copy_to_user and clear_user methods for CPU
1749	  cores where a 8-word STM instruction give significantly higher
1750	  memory write throughput than a sequence of individual 32bit stores.
1751
1752	  A possible side effect is a slight increase in scheduling latency
1753	  between threads sharing the same address space if they invoke
1754	  such copy operations with large buffers.
1755
1756	  However, if the CPU data cache is using a write-allocate mode,
1757	  this option is unlikely to provide any performance gain.
1758
1759config SECCOMP
1760	bool
1761	prompt "Enable seccomp to safely compute untrusted bytecode"
1762	---help---
1763	  This kernel feature is useful for number crunching applications
1764	  that may need to compute untrusted bytecode during their
1765	  execution. By using pipes or other transports made available to
1766	  the process as file descriptors supporting the read/write
1767	  syscalls, it's possible to isolate those applications in
1768	  their own address space using seccomp. Once seccomp is
1769	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1770	  and the task is only allowed to execute a few safe syscalls
1771	  defined by each seccomp mode.
1772
1773config SWIOTLB
1774	def_bool y
1775
1776config IOMMU_HELPER
1777	def_bool SWIOTLB
1778
1779config XEN_DOM0
1780	def_bool y
1781	depends on XEN
1782
1783config XEN
1784	bool "Xen guest support on ARM"
1785	depends on ARM && AEABI && OF
1786	depends on CPU_V7 && !CPU_V6
1787	depends on !GENERIC_ATOMIC64
1788	depends on MMU
1789	select ARCH_DMA_ADDR_T_64BIT
1790	select ARM_PSCI
1791	select SWIOTLB_XEN
1792	help
1793	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1794
1795endmenu
1796
1797menu "Boot options"
1798
1799config USE_OF
1800	bool "Flattened Device Tree support"
1801	select IRQ_DOMAIN
1802	select OF
1803	select OF_EARLY_FLATTREE
1804	select OF_RESERVED_MEM
1805	help
1806	  Include support for flattened device tree machine descriptions.
1807
1808config ATAGS
1809	bool "Support for the traditional ATAGS boot data passing" if USE_OF
1810	default y
1811	help
1812	  This is the traditional way of passing data to the kernel at boot
1813	  time. If you are solely relying on the flattened device tree (or
1814	  the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1815	  to remove ATAGS support from your kernel binary.  If unsure,
1816	  leave this to y.
1817
1818config DEPRECATED_PARAM_STRUCT
1819	bool "Provide old way to pass kernel parameters"
1820	depends on ATAGS
1821	help
1822	  This was deprecated in 2001 and announced to live on for 5 years.
1823	  Some old boot loaders still use this way.
1824
1825# Compressed boot loader in ROM.  Yes, we really want to ask about
1826# TEXT and BSS so we preserve their values in the config files.
1827config ZBOOT_ROM_TEXT
1828	hex "Compressed ROM boot loader base address"
1829	default "0"
1830	help
1831	  The physical address at which the ROM-able zImage is to be
1832	  placed in the target.  Platforms which normally make use of
1833	  ROM-able zImage formats normally set this to a suitable
1834	  value in their defconfig file.
1835
1836	  If ZBOOT_ROM is not enabled, this has no effect.
1837
1838config ZBOOT_ROM_BSS
1839	hex "Compressed ROM boot loader BSS address"
1840	default "0"
1841	help
1842	  The base address of an area of read/write memory in the target
1843	  for the ROM-able zImage which must be available while the
1844	  decompressor is running. It must be large enough to hold the
1845	  entire decompressed kernel plus an additional 128 KiB.
1846	  Platforms which normally make use of ROM-able zImage formats
1847	  normally set this to a suitable value in their defconfig file.
1848
1849	  If ZBOOT_ROM is not enabled, this has no effect.
1850
1851config ZBOOT_ROM
1852	bool "Compressed boot loader in ROM/flash"
1853	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1854	depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1855	help
1856	  Say Y here if you intend to execute your compressed kernel image
1857	  (zImage) directly from ROM or flash.  If unsure, say N.
1858
1859choice
1860	prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1861	depends on ZBOOT_ROM && ARCH_SH7372
1862	default ZBOOT_ROM_NONE
1863	help
1864	  Include experimental SD/MMC loading code in the ROM-able zImage.
1865	  With this enabled it is possible to write the ROM-able zImage
1866	  kernel image to an MMC or SD card and boot the kernel straight
1867	  from the reset vector. At reset the processor Mask ROM will load
1868	  the first part of the ROM-able zImage which in turn loads the
1869	  rest the kernel image to RAM.
1870
1871config ZBOOT_ROM_NONE
1872	bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1873	help
1874	  Do not load image from SD or MMC
1875
1876config ZBOOT_ROM_MMCIF
1877	bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1878	help
1879	  Load image from MMCIF hardware block.
1880
1881config ZBOOT_ROM_SH_MOBILE_SDHI
1882	bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1883	help
1884	  Load image from SDHI hardware block
1885
1886endchoice
1887
1888config ARM_APPENDED_DTB
1889	bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1890	depends on OF
1891	help
1892	  With this option, the boot code will look for a device tree binary
1893	  (DTB) appended to zImage
1894	  (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1895
1896	  This is meant as a backward compatibility convenience for those
1897	  systems with a bootloader that can't be upgraded to accommodate
1898	  the documented boot protocol using a device tree.
1899
1900	  Beware that there is very little in terms of protection against
1901	  this option being confused by leftover garbage in memory that might
1902	  look like a DTB header after a reboot if no actual DTB is appended
1903	  to zImage.  Do not leave this option active in a production kernel
1904	  if you don't intend to always append a DTB.  Proper passing of the
1905	  location into r2 of a bootloader provided DTB is always preferable
1906	  to this option.
1907
1908config ARM_ATAG_DTB_COMPAT
1909	bool "Supplement the appended DTB with traditional ATAG information"
1910	depends on ARM_APPENDED_DTB
1911	help
1912	  Some old bootloaders can't be updated to a DTB capable one, yet
1913	  they provide ATAGs with memory configuration, the ramdisk address,
1914	  the kernel cmdline string, etc.  Such information is dynamically
1915	  provided by the bootloader and can't always be stored in a static
1916	  DTB.  To allow a device tree enabled kernel to be used with such
1917	  bootloaders, this option allows zImage to extract the information
1918	  from the ATAG list and store it at run time into the appended DTB.
1919
1920choice
1921	prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1922	default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1923
1924config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1925	bool "Use bootloader kernel arguments if available"
1926	help
1927	  Uses the command-line options passed by the boot loader instead of
1928	  the device tree bootargs property. If the boot loader doesn't provide
1929	  any, the device tree bootargs property will be used.
1930
1931config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1932	bool "Extend with bootloader kernel arguments"
1933	help
1934	  The command-line arguments provided by the boot loader will be
1935	  appended to the the device tree bootargs property.
1936
1937endchoice
1938
1939config CMDLINE
1940	string "Default kernel command string"
1941	default ""
1942	help
1943	  On some architectures (EBSA110 and CATS), there is currently no way
1944	  for the boot loader to pass arguments to the kernel. For these
1945	  architectures, you should supply some command-line options at build
1946	  time by entering them here. As a minimum, you should specify the
1947	  memory size and the root device (e.g., mem=64M root=/dev/nfs).
1948
1949choice
1950	prompt "Kernel command line type" if CMDLINE != ""
1951	default CMDLINE_FROM_BOOTLOADER
1952	depends on ATAGS
1953
1954config CMDLINE_FROM_BOOTLOADER
1955	bool "Use bootloader kernel arguments if available"
1956	help
1957	  Uses the command-line options passed by the boot loader. If
1958	  the boot loader doesn't provide any, the default kernel command
1959	  string provided in CMDLINE will be used.
1960
1961config CMDLINE_EXTEND
1962	bool "Extend bootloader kernel arguments"
1963	help
1964	  The command-line arguments provided by the boot loader will be
1965	  appended to the default kernel command string.
1966
1967config CMDLINE_FORCE
1968	bool "Always use the default kernel command string"
1969	help
1970	  Always use the default kernel command string, even if the boot
1971	  loader passes other arguments to the kernel.
1972	  This is useful if you cannot or don't want to change the
1973	  command-line options your boot loader passes to the kernel.
1974endchoice
1975
1976config XIP_KERNEL
1977	bool "Kernel Execute-In-Place from ROM"
1978	depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1979	help
1980	  Execute-In-Place allows the kernel to run from non-volatile storage
1981	  directly addressable by the CPU, such as NOR flash. This saves RAM
1982	  space since the text section of the kernel is not loaded from flash
1983	  to RAM.  Read-write sections, such as the data section and stack,
1984	  are still copied to RAM.  The XIP kernel is not compressed since
1985	  it has to run directly from flash, so it will take more space to
1986	  store it.  The flash address used to link the kernel object files,
1987	  and for storing it, is configuration dependent. Therefore, if you
1988	  say Y here, you must know the proper physical address where to
1989	  store the kernel image depending on your own flash memory usage.
1990
1991	  Also note that the make target becomes "make xipImage" rather than
1992	  "make zImage" or "make Image".  The final kernel binary to put in
1993	  ROM memory will be arch/arm/boot/xipImage.
1994
1995	  If unsure, say N.
1996
1997config XIP_PHYS_ADDR
1998	hex "XIP Kernel Physical Location"
1999	depends on XIP_KERNEL
2000	default "0x00080000"
2001	help
2002	  This is the physical address in your flash memory the kernel will
2003	  be linked for and stored to.  This address is dependent on your
2004	  own flash usage.
2005
2006config KEXEC
2007	bool "Kexec system call (EXPERIMENTAL)"
2008	depends on (!SMP || PM_SLEEP_SMP)
2009	help
2010	  kexec is a system call that implements the ability to shutdown your
2011	  current kernel, and to start another kernel.  It is like a reboot
2012	  but it is independent of the system firmware.   And like a reboot
2013	  you can start any kernel with it, not just Linux.
2014
2015	  It is an ongoing process to be certain the hardware in a machine
2016	  is properly shutdown, so do not be surprised if this code does not
2017	  initially work for you.
2018
2019config ATAGS_PROC
2020	bool "Export atags in procfs"
2021	depends on ATAGS && KEXEC
2022	default y
2023	help
2024	  Should the atags used to boot the kernel be exported in an "atags"
2025	  file in procfs. Useful with kexec.
2026
2027config CRASH_DUMP
2028	bool "Build kdump crash kernel (EXPERIMENTAL)"
2029	help
2030	  Generate crash dump after being started by kexec. This should
2031	  be normally only set in special crash dump kernels which are
2032	  loaded in the main kernel with kexec-tools into a specially
2033	  reserved region and then later executed after a crash by
2034	  kdump/kexec. The crash dump kernel must be compiled to a
2035	  memory address not used by the main kernel
2036
2037	  For more details see Documentation/kdump/kdump.txt
2038
2039config AUTO_ZRELADDR
2040	bool "Auto calculation of the decompressed kernel image address"
2041	help
2042	  ZRELADDR is the physical address where the decompressed kernel
2043	  image will be placed. If AUTO_ZRELADDR is selected, the address
2044	  will be determined at run-time by masking the current IP with
2045	  0xf8000000. This assumes the zImage being placed in the first 128MB
2046	  from start of memory.
2047
2048endmenu
2049
2050menu "CPU Power Management"
2051
2052source "drivers/cpufreq/Kconfig"
2053
2054source "drivers/cpuidle/Kconfig"
2055
2056endmenu
2057
2058menu "Floating point emulation"
2059
2060comment "At least one emulation must be selected"
2061
2062config FPE_NWFPE
2063	bool "NWFPE math emulation"
2064	depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2065	---help---
2066	  Say Y to include the NWFPE floating point emulator in the kernel.
2067	  This is necessary to run most binaries. Linux does not currently
2068	  support floating point hardware so you need to say Y here even if
2069	  your machine has an FPA or floating point co-processor podule.
2070
2071	  You may say N here if you are going to load the Acorn FPEmulator
2072	  early in the bootup.
2073
2074config FPE_NWFPE_XP
2075	bool "Support extended precision"
2076	depends on FPE_NWFPE
2077	help
2078	  Say Y to include 80-bit support in the kernel floating-point
2079	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
2080	  Note that gcc does not generate 80-bit operations by default,
2081	  so in most cases this option only enlarges the size of the
2082	  floating point emulator without any good reason.
2083
2084	  You almost surely want to say N here.
2085
2086config FPE_FASTFPE
2087	bool "FastFPE math emulation (EXPERIMENTAL)"
2088	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2089	---help---
2090	  Say Y here to include the FAST floating point emulator in the kernel.
2091	  This is an experimental much faster emulator which now also has full
2092	  precision for the mantissa.  It does not support any exceptions.
2093	  It is very simple, and approximately 3-6 times faster than NWFPE.
2094
2095	  It should be sufficient for most programs.  It may be not suitable
2096	  for scientific calculations, but you have to check this for yourself.
2097	  If you do not feel you need a faster FP emulation you should better
2098	  choose NWFPE.
2099
2100config VFP
2101	bool "VFP-format floating point maths"
2102	depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2103	help
2104	  Say Y to include VFP support code in the kernel. This is needed
2105	  if your hardware includes a VFP unit.
2106
2107	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
2108	  release notes and additional status information.
2109
2110	  Say N if your target does not have VFP hardware.
2111
2112config VFPv3
2113	bool
2114	depends on VFP
2115	default y if CPU_V7
2116
2117config NEON
2118	bool "Advanced SIMD (NEON) Extension support"
2119	depends on VFPv3 && CPU_V7
2120	help
2121	  Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2122	  Extension.
2123
2124config KERNEL_MODE_NEON
2125	bool "Support for NEON in kernel mode"
2126	depends on NEON && AEABI
2127	help
2128	  Say Y to include support for NEON in kernel mode.
2129
2130endmenu
2131
2132menu "Userspace binary formats"
2133
2134source "fs/Kconfig.binfmt"
2135
2136endmenu
2137
2138menu "Power management options"
2139
2140source "kernel/power/Kconfig"
2141
2142config ARCH_SUSPEND_POSSIBLE
2143	depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2144		CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2145	def_bool y
2146
2147config ARM_CPU_SUSPEND
2148	def_bool PM_SLEEP
2149
2150config ARCH_HIBERNATION_POSSIBLE
2151	bool
2152	depends on MMU
2153	default y if ARCH_SUSPEND_POSSIBLE
2154
2155endmenu
2156
2157source "net/Kconfig"
2158
2159source "drivers/Kconfig"
2160
2161source "fs/Kconfig"
2162
2163source "arch/arm/Kconfig.debug"
2164
2165source "security/Kconfig"
2166
2167source "crypto/Kconfig"
2168if CRYPTO
2169source "arch/arm/crypto/Kconfig"
2170endif
2171
2172source "lib/Kconfig"
2173
2174source "arch/arm/kvm/Kconfig"
2175