xref: /openbmc/linux/arch/arm/Kconfig (revision 5c73cc4b6c83e88863a5de869cc5df3b913aef4a)
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 PINCTRL
371	select PINCTRL_AT91
372	select SOC_BUS
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_SHMOBILE_LEGACY
636	bool "Renesas ARM SoCs (non-multiplatform)"
637	select ARCH_SHMOBILE
638	select ARM_PATCH_PHYS_VIRT if MMU
639	select CLKDEV_LOOKUP
640	select CPU_V7
641	select GENERIC_CLOCKEVENTS
642	select HAVE_ARM_SCU if SMP
643	select HAVE_ARM_TWD if SMP
644	select HAVE_MACH_CLKDEV
645	select HAVE_SMP
646	select MIGHT_HAVE_CACHE_L2X0
647	select MULTI_IRQ_HANDLER
648	select NO_IOPORT_MAP
649	select PINCTRL
650	select PM_GENERIC_DOMAINS if PM
651	select SH_CLK_CPG
652	select SPARSE_IRQ
653	help
654	  Support for Renesas ARM SoC platforms using a non-multiplatform
655	  kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
656	  and RZ families.
657
658config ARCH_RPC
659	bool "RiscPC"
660	select ARCH_ACORN
661	select ARCH_MAY_HAVE_PC_FDC
662	select ARCH_SPARSEMEM_ENABLE
663	select ARCH_USES_GETTIMEOFFSET
664	select CPU_SA110
665	select FIQ
666	select HAVE_IDE
667	select HAVE_PATA_PLATFORM
668	select ISA_DMA_API
669	select NEED_MACH_IO_H
670	select NEED_MACH_MEMORY_H
671	select NO_IOPORT_MAP
672	select VIRT_TO_BUS
673	help
674	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
675	  CD-ROM interface, serial and parallel port, and the floppy drive.
676
677config ARCH_SA1100
678	bool "SA1100-based"
679	select ARCH_MTD_XIP
680	select ARCH_REQUIRE_GPIOLIB
681	select ARCH_SPARSEMEM_ENABLE
682	select CLKDEV_LOOKUP
683	select CLKSRC_MMIO
684	select CPU_FREQ
685	select CPU_SA1100
686	select GENERIC_CLOCKEVENTS
687	select HAVE_IDE
688	select IRQ_DOMAIN
689	select ISA
690	select MULTI_IRQ_HANDLER
691	select NEED_MACH_MEMORY_H
692	select SPARSE_IRQ
693	help
694	  Support for StrongARM 11x0 based boards.
695
696config ARCH_S3C24XX
697	bool "Samsung S3C24XX SoCs"
698	select ARCH_REQUIRE_GPIOLIB
699	select ATAGS
700	select CLKDEV_LOOKUP
701	select CLKSRC_SAMSUNG_PWM
702	select GENERIC_CLOCKEVENTS
703	select GPIO_SAMSUNG
704	select HAVE_S3C2410_I2C if I2C
705	select HAVE_S3C2410_WATCHDOG if WATCHDOG
706	select HAVE_S3C_RTC if RTC_CLASS
707	select MULTI_IRQ_HANDLER
708	select NEED_MACH_IO_H
709	select SAMSUNG_ATAGS
710	help
711	  Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
712	  and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
713	  (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
714	  Samsung SMDK2410 development board (and derivatives).
715
716config ARCH_S3C64XX
717	bool "Samsung S3C64XX"
718	select ARCH_REQUIRE_GPIOLIB
719	select ARM_AMBA
720	select ARM_VIC
721	select ATAGS
722	select CLKDEV_LOOKUP
723	select CLKSRC_SAMSUNG_PWM
724	select COMMON_CLK_SAMSUNG
725	select CPU_V6K
726	select GENERIC_CLOCKEVENTS
727	select GPIO_SAMSUNG
728	select HAVE_S3C2410_I2C if I2C
729	select HAVE_S3C2410_WATCHDOG if WATCHDOG
730	select HAVE_TCM
731	select NO_IOPORT_MAP
732	select PLAT_SAMSUNG
733	select PM_GENERIC_DOMAINS if PM
734	select S3C_DEV_NAND
735	select S3C_GPIO_TRACK
736	select SAMSUNG_ATAGS
737	select SAMSUNG_WAKEMASK
738	select SAMSUNG_WDT_RESET
739	help
740	  Samsung S3C64XX series based systems
741
742config ARCH_DAVINCI
743	bool "TI DaVinci"
744	select ARCH_HAS_HOLES_MEMORYMODEL
745	select ARCH_REQUIRE_GPIOLIB
746	select CLKDEV_LOOKUP
747	select GENERIC_ALLOCATOR
748	select GENERIC_CLOCKEVENTS
749	select GENERIC_IRQ_CHIP
750	select HAVE_IDE
751	select TI_PRIV_EDMA
752	select USE_OF
753	select ZONE_DMA
754	help
755	  Support for TI's DaVinci platform.
756
757config ARCH_OMAP1
758	bool "TI OMAP1"
759	depends on MMU
760	select ARCH_HAS_HOLES_MEMORYMODEL
761	select ARCH_OMAP
762	select ARCH_REQUIRE_GPIOLIB
763	select CLKDEV_LOOKUP
764	select CLKSRC_MMIO
765	select GENERIC_CLOCKEVENTS
766	select GENERIC_IRQ_CHIP
767	select HAVE_IDE
768	select IRQ_DOMAIN
769	select NEED_MACH_IO_H if PCCARD
770	select NEED_MACH_MEMORY_H
771	help
772	  Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
773
774endchoice
775
776menu "Multiple platform selection"
777	depends on ARCH_MULTIPLATFORM
778
779comment "CPU Core family selection"
780
781config ARCH_MULTI_V4
782	bool "ARMv4 based platforms (FA526)"
783	depends on !ARCH_MULTI_V6_V7
784	select ARCH_MULTI_V4_V5
785	select CPU_FA526
786
787config ARCH_MULTI_V4T
788	bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
789	depends on !ARCH_MULTI_V6_V7
790	select ARCH_MULTI_V4_V5
791	select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
792		CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
793		CPU_ARM925T || CPU_ARM940T)
794
795config ARCH_MULTI_V5
796	bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
797	depends on !ARCH_MULTI_V6_V7
798	select ARCH_MULTI_V4_V5
799	select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
800		CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
801		CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
802
803config ARCH_MULTI_V4_V5
804	bool
805
806config ARCH_MULTI_V6
807	bool "ARMv6 based platforms (ARM11)"
808	select ARCH_MULTI_V6_V7
809	select CPU_V6K
810
811config ARCH_MULTI_V7
812	bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
813	default y
814	select ARCH_MULTI_V6_V7
815	select CPU_V7
816	select HAVE_SMP
817
818config ARCH_MULTI_V6_V7
819	bool
820	select MIGHT_HAVE_CACHE_L2X0
821
822config ARCH_MULTI_CPU_AUTO
823	def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
824	select ARCH_MULTI_V5
825
826endmenu
827
828config ARCH_VIRT
829	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
830	select ARM_AMBA
831	select ARM_GIC
832	select ARM_PSCI
833	select HAVE_ARM_ARCH_TIMER
834
835#
836# This is sorted alphabetically by mach-* pathname.  However, plat-*
837# Kconfigs may be included either alphabetically (according to the
838# plat- suffix) or along side the corresponding mach-* source.
839#
840source "arch/arm/mach-mvebu/Kconfig"
841
842source "arch/arm/mach-alpine/Kconfig"
843
844source "arch/arm/mach-asm9260/Kconfig"
845
846source "arch/arm/mach-at91/Kconfig"
847
848source "arch/arm/mach-axxia/Kconfig"
849
850source "arch/arm/mach-bcm/Kconfig"
851
852source "arch/arm/mach-berlin/Kconfig"
853
854source "arch/arm/mach-clps711x/Kconfig"
855
856source "arch/arm/mach-cns3xxx/Kconfig"
857
858source "arch/arm/mach-davinci/Kconfig"
859
860source "arch/arm/mach-digicolor/Kconfig"
861
862source "arch/arm/mach-dove/Kconfig"
863
864source "arch/arm/mach-ep93xx/Kconfig"
865
866source "arch/arm/mach-footbridge/Kconfig"
867
868source "arch/arm/mach-gemini/Kconfig"
869
870source "arch/arm/mach-highbank/Kconfig"
871
872source "arch/arm/mach-hisi/Kconfig"
873
874source "arch/arm/mach-integrator/Kconfig"
875
876source "arch/arm/mach-iop32x/Kconfig"
877
878source "arch/arm/mach-iop33x/Kconfig"
879
880source "arch/arm/mach-iop13xx/Kconfig"
881
882source "arch/arm/mach-ixp4xx/Kconfig"
883
884source "arch/arm/mach-keystone/Kconfig"
885
886source "arch/arm/mach-ks8695/Kconfig"
887
888source "arch/arm/mach-meson/Kconfig"
889
890source "arch/arm/mach-moxart/Kconfig"
891
892source "arch/arm/mach-mv78xx0/Kconfig"
893
894source "arch/arm/mach-imx/Kconfig"
895
896source "arch/arm/mach-mediatek/Kconfig"
897
898source "arch/arm/mach-mxs/Kconfig"
899
900source "arch/arm/mach-netx/Kconfig"
901
902source "arch/arm/mach-nomadik/Kconfig"
903
904source "arch/arm/mach-nspire/Kconfig"
905
906source "arch/arm/plat-omap/Kconfig"
907
908source "arch/arm/mach-omap1/Kconfig"
909
910source "arch/arm/mach-omap2/Kconfig"
911
912source "arch/arm/mach-orion5x/Kconfig"
913
914source "arch/arm/mach-picoxcell/Kconfig"
915
916source "arch/arm/mach-pxa/Kconfig"
917source "arch/arm/plat-pxa/Kconfig"
918
919source "arch/arm/mach-mmp/Kconfig"
920
921source "arch/arm/mach-qcom/Kconfig"
922
923source "arch/arm/mach-realview/Kconfig"
924
925source "arch/arm/mach-rockchip/Kconfig"
926
927source "arch/arm/mach-sa1100/Kconfig"
928
929source "arch/arm/mach-socfpga/Kconfig"
930
931source "arch/arm/mach-spear/Kconfig"
932
933source "arch/arm/mach-sti/Kconfig"
934
935source "arch/arm/mach-s3c24xx/Kconfig"
936
937source "arch/arm/mach-s3c64xx/Kconfig"
938
939source "arch/arm/mach-s5pv210/Kconfig"
940
941source "arch/arm/mach-exynos/Kconfig"
942source "arch/arm/plat-samsung/Kconfig"
943
944source "arch/arm/mach-shmobile/Kconfig"
945
946source "arch/arm/mach-sunxi/Kconfig"
947
948source "arch/arm/mach-prima2/Kconfig"
949
950source "arch/arm/mach-tegra/Kconfig"
951
952source "arch/arm/mach-u300/Kconfig"
953
954source "arch/arm/mach-ux500/Kconfig"
955
956source "arch/arm/mach-versatile/Kconfig"
957
958source "arch/arm/mach-vexpress/Kconfig"
959source "arch/arm/plat-versatile/Kconfig"
960
961source "arch/arm/mach-vt8500/Kconfig"
962
963source "arch/arm/mach-w90x900/Kconfig"
964
965source "arch/arm/mach-zynq/Kconfig"
966
967# Definitions to make life easier
968config ARCH_ACORN
969	bool
970
971config PLAT_IOP
972	bool
973	select GENERIC_CLOCKEVENTS
974
975config PLAT_ORION
976	bool
977	select CLKSRC_MMIO
978	select COMMON_CLK
979	select GENERIC_IRQ_CHIP
980	select IRQ_DOMAIN
981
982config PLAT_ORION_LEGACY
983	bool
984	select PLAT_ORION
985
986config PLAT_PXA
987	bool
988
989config PLAT_VERSATILE
990	bool
991
992config ARM_TIMER_SP804
993	bool
994	select CLKSRC_MMIO
995	select CLKSRC_OF if OF
996
997source "arch/arm/firmware/Kconfig"
998
999source arch/arm/mm/Kconfig
1000
1001config IWMMXT
1002	bool "Enable iWMMXt support"
1003	depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1004	default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1005	help
1006	  Enable support for iWMMXt context switching at run time if
1007	  running on a CPU that supports it.
1008
1009config MULTI_IRQ_HANDLER
1010	bool
1011	help
1012	  Allow each machine to specify it's own IRQ handler at run time.
1013
1014if !MMU
1015source "arch/arm/Kconfig-nommu"
1016endif
1017
1018config PJ4B_ERRATA_4742
1019	bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1020	depends on CPU_PJ4B && MACH_ARMADA_370
1021	default y
1022	help
1023	  When coming out of either a Wait for Interrupt (WFI) or a Wait for
1024	  Event (WFE) IDLE states, a specific timing sensitivity exists between
1025	  the retiring WFI/WFE instructions and the newly issued subsequent
1026	  instructions.  This sensitivity can result in a CPU hang scenario.
1027	  Workaround:
1028	  The software must insert either a Data Synchronization Barrier (DSB)
1029	  or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1030	  instruction
1031
1032config ARM_ERRATA_326103
1033	bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1034	depends on CPU_V6
1035	help
1036	  Executing a SWP instruction to read-only memory does not set bit 11
1037	  of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1038	  treat the access as a read, preventing a COW from occurring and
1039	  causing the faulting task to livelock.
1040
1041config ARM_ERRATA_411920
1042	bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1043	depends on CPU_V6 || CPU_V6K
1044	help
1045	  Invalidation of the Instruction Cache operation can
1046	  fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1047	  It does not affect the MPCore. This option enables the ARM Ltd.
1048	  recommended workaround.
1049
1050config ARM_ERRATA_430973
1051	bool "ARM errata: Stale prediction on replaced interworking branch"
1052	depends on CPU_V7
1053	help
1054	  This option enables the workaround for the 430973 Cortex-A8
1055	  r1p* erratum. If a code sequence containing an ARM/Thumb
1056	  interworking branch is replaced with another code sequence at the
1057	  same virtual address, whether due to self-modifying code or virtual
1058	  to physical address re-mapping, Cortex-A8 does not recover from the
1059	  stale interworking branch prediction. This results in Cortex-A8
1060	  executing the new code sequence in the incorrect ARM or Thumb state.
1061	  The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1062	  and also flushes the branch target cache at every context switch.
1063	  Note that setting specific bits in the ACTLR register may not be
1064	  available in non-secure mode.
1065
1066config ARM_ERRATA_458693
1067	bool "ARM errata: Processor deadlock when a false hazard is created"
1068	depends on CPU_V7
1069	depends on !ARCH_MULTIPLATFORM
1070	help
1071	  This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1072	  erratum. For very specific sequences of memory operations, it is
1073	  possible for a hazard condition intended for a cache line to instead
1074	  be incorrectly associated with a different cache line. This false
1075	  hazard might then cause a processor deadlock. The workaround enables
1076	  the L1 caching of the NEON accesses and disables the PLD instruction
1077	  in the ACTLR register. Note that setting specific bits in the ACTLR
1078	  register may not be available in non-secure mode.
1079
1080config ARM_ERRATA_460075
1081	bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1082	depends on CPU_V7
1083	depends on !ARCH_MULTIPLATFORM
1084	help
1085	  This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1086	  erratum. Any asynchronous access to the L2 cache may encounter a
1087	  situation in which recent store transactions to the L2 cache are lost
1088	  and overwritten with stale memory contents from external memory. The
1089	  workaround disables the write-allocate mode for the L2 cache via the
1090	  ACTLR register. Note that setting specific bits in the ACTLR register
1091	  may not be available in non-secure mode.
1092
1093config ARM_ERRATA_742230
1094	bool "ARM errata: DMB operation may be faulty"
1095	depends on CPU_V7 && SMP
1096	depends on !ARCH_MULTIPLATFORM
1097	help
1098	  This option enables the workaround for the 742230 Cortex-A9
1099	  (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1100	  between two write operations may not ensure the correct visibility
1101	  ordering of the two writes. This workaround sets a specific bit in
1102	  the diagnostic register of the Cortex-A9 which causes the DMB
1103	  instruction to behave as a DSB, ensuring the correct behaviour of
1104	  the two writes.
1105
1106config ARM_ERRATA_742231
1107	bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1108	depends on CPU_V7 && SMP
1109	depends on !ARCH_MULTIPLATFORM
1110	help
1111	  This option enables the workaround for the 742231 Cortex-A9
1112	  (r2p0..r2p2) erratum. Under certain conditions, specific to the
1113	  Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1114	  accessing some data located in the same cache line, may get corrupted
1115	  data due to bad handling of the address hazard when the line gets
1116	  replaced from one of the CPUs at the same time as another CPU is
1117	  accessing it. This workaround sets specific bits in the diagnostic
1118	  register of the Cortex-A9 which reduces the linefill issuing
1119	  capabilities of the processor.
1120
1121config ARM_ERRATA_643719
1122	bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1123	depends on CPU_V7 && SMP
1124	default y
1125	help
1126	  This option enables the workaround for the 643719 Cortex-A9 (prior to
1127	  r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1128	  register returns zero when it should return one. The workaround
1129	  corrects this value, ensuring cache maintenance operations which use
1130	  it behave as intended and avoiding data corruption.
1131
1132config ARM_ERRATA_720789
1133	bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1134	depends on CPU_V7
1135	help
1136	  This option enables the workaround for the 720789 Cortex-A9 (prior to
1137	  r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1138	  broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1139	  As a consequence of this erratum, some TLB entries which should be
1140	  invalidated are not, resulting in an incoherency in the system page
1141	  tables. The workaround changes the TLB flushing routines to invalidate
1142	  entries regardless of the ASID.
1143
1144config ARM_ERRATA_743622
1145	bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1146	depends on CPU_V7
1147	depends on !ARCH_MULTIPLATFORM
1148	help
1149	  This option enables the workaround for the 743622 Cortex-A9
1150	  (r2p*) erratum. Under very rare conditions, a faulty
1151	  optimisation in the Cortex-A9 Store Buffer may lead to data
1152	  corruption. This workaround sets a specific bit in the diagnostic
1153	  register of the Cortex-A9 which disables the Store Buffer
1154	  optimisation, preventing the defect from occurring. This has no
1155	  visible impact on the overall performance or power consumption of the
1156	  processor.
1157
1158config ARM_ERRATA_751472
1159	bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1160	depends on CPU_V7
1161	depends on !ARCH_MULTIPLATFORM
1162	help
1163	  This option enables the workaround for the 751472 Cortex-A9 (prior
1164	  to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1165	  completion of a following broadcasted operation if the second
1166	  operation is received by a CPU before the ICIALLUIS has completed,
1167	  potentially leading to corrupted entries in the cache or TLB.
1168
1169config ARM_ERRATA_754322
1170	bool "ARM errata: possible faulty MMU translations following an ASID switch"
1171	depends on CPU_V7
1172	help
1173	  This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1174	  r3p*) erratum. A speculative memory access may cause a page table walk
1175	  which starts prior to an ASID switch but completes afterwards. This
1176	  can populate the micro-TLB with a stale entry which may be hit with
1177	  the new ASID. This workaround places two dsb instructions in the mm
1178	  switching code so that no page table walks can cross the ASID switch.
1179
1180config ARM_ERRATA_754327
1181	bool "ARM errata: no automatic Store Buffer drain"
1182	depends on CPU_V7 && SMP
1183	help
1184	  This option enables the workaround for the 754327 Cortex-A9 (prior to
1185	  r2p0) erratum. The Store Buffer does not have any automatic draining
1186	  mechanism and therefore a livelock may occur if an external agent
1187	  continuously polls a memory location waiting to observe an update.
1188	  This workaround defines cpu_relax() as smp_mb(), preventing correctly
1189	  written polling loops from denying visibility of updates to memory.
1190
1191config ARM_ERRATA_364296
1192	bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1193	depends on CPU_V6
1194	help
1195	  This options enables the workaround for the 364296 ARM1136
1196	  r0p2 erratum (possible cache data corruption with
1197	  hit-under-miss enabled). It sets the undocumented bit 31 in
1198	  the auxiliary control register and the FI bit in the control
1199	  register, thus disabling hit-under-miss without putting the
1200	  processor into full low interrupt latency mode. ARM11MPCore
1201	  is not affected.
1202
1203config ARM_ERRATA_764369
1204	bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1205	depends on CPU_V7 && SMP
1206	help
1207	  This option enables the workaround for erratum 764369
1208	  affecting Cortex-A9 MPCore with two or more processors (all
1209	  current revisions). Under certain timing circumstances, a data
1210	  cache line maintenance operation by MVA targeting an Inner
1211	  Shareable memory region may fail to proceed up to either the
1212	  Point of Coherency or to the Point of Unification of the
1213	  system. This workaround adds a DSB instruction before the
1214	  relevant cache maintenance functions and sets a specific bit
1215	  in the diagnostic control register of the SCU.
1216
1217config ARM_ERRATA_775420
1218       bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1219       depends on CPU_V7
1220       help
1221	 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1222	 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1223	 operation aborts with MMU exception, it might cause the processor
1224	 to deadlock. This workaround puts DSB before executing ISB if
1225	 an abort may occur on cache maintenance.
1226
1227config ARM_ERRATA_798181
1228	bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1229	depends on CPU_V7 && SMP
1230	help
1231	  On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1232	  adequately shooting down all use of the old entries. This
1233	  option enables the Linux kernel workaround for this erratum
1234	  which sends an IPI to the CPUs that are running the same ASID
1235	  as the one being invalidated.
1236
1237config ARM_ERRATA_773022
1238	bool "ARM errata: incorrect instructions may be executed from loop buffer"
1239	depends on CPU_V7
1240	help
1241	  This option enables the workaround for the 773022 Cortex-A15
1242	  (up to r0p4) erratum. In certain rare sequences of code, the
1243	  loop buffer may deliver incorrect instructions. This
1244	  workaround disables the loop buffer to avoid the erratum.
1245
1246endmenu
1247
1248source "arch/arm/common/Kconfig"
1249
1250menu "Bus support"
1251
1252config ISA
1253	bool
1254	help
1255	  Find out whether you have ISA slots on your motherboard.  ISA is the
1256	  name of a bus system, i.e. the way the CPU talks to the other stuff
1257	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
1258	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1259	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
1260
1261# Select ISA DMA controller support
1262config ISA_DMA
1263	bool
1264	select ISA_DMA_API
1265
1266# Select ISA DMA interface
1267config ISA_DMA_API
1268	bool
1269
1270config PCI
1271	bool "PCI support" if MIGHT_HAVE_PCI
1272	help
1273	  Find out whether you have a PCI motherboard. PCI is the name of a
1274	  bus system, i.e. the way the CPU talks to the other stuff inside
1275	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1276	  VESA. If you have PCI, say Y, otherwise N.
1277
1278config PCI_DOMAINS
1279	bool
1280	depends on PCI
1281
1282config PCI_DOMAINS_GENERIC
1283	def_bool PCI_DOMAINS
1284
1285config PCI_NANOENGINE
1286	bool "BSE nanoEngine PCI support"
1287	depends on SA1100_NANOENGINE
1288	help
1289	  Enable PCI on the BSE nanoEngine board.
1290
1291config PCI_SYSCALL
1292	def_bool PCI
1293
1294config PCI_HOST_ITE8152
1295	bool
1296	depends on PCI && MACH_ARMCORE
1297	default y
1298	select DMABOUNCE
1299
1300source "drivers/pci/Kconfig"
1301source "drivers/pci/pcie/Kconfig"
1302
1303source "drivers/pcmcia/Kconfig"
1304
1305endmenu
1306
1307menu "Kernel Features"
1308
1309config HAVE_SMP
1310	bool
1311	help
1312	  This option should be selected by machines which have an SMP-
1313	  capable CPU.
1314
1315	  The only effect of this option is to make the SMP-related
1316	  options available to the user for configuration.
1317
1318config SMP
1319	bool "Symmetric Multi-Processing"
1320	depends on CPU_V6K || CPU_V7
1321	depends on GENERIC_CLOCKEVENTS
1322	depends on HAVE_SMP
1323	depends on MMU || ARM_MPU
1324	help
1325	  This enables support for systems with more than one CPU. If you have
1326	  a system with only one CPU, say N. If you have a system with more
1327	  than one CPU, say Y.
1328
1329	  If you say N here, the kernel will run on uni- and multiprocessor
1330	  machines, but will use only one CPU of a multiprocessor machine. If
1331	  you say Y here, the kernel will run on many, but not all,
1332	  uniprocessor machines. On a uniprocessor machine, the kernel
1333	  will run faster if you say N here.
1334
1335	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
1336	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1337	  <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1338
1339	  If you don't know what to do here, say N.
1340
1341config SMP_ON_UP
1342	bool "Allow booting SMP kernel on uniprocessor systems"
1343	depends on SMP && !XIP_KERNEL && MMU
1344	default y
1345	help
1346	  SMP kernels contain instructions which fail on non-SMP processors.
1347	  Enabling this option allows the kernel to modify itself to make
1348	  these instructions safe.  Disabling it allows about 1K of space
1349	  savings.
1350
1351	  If you don't know what to do here, say Y.
1352
1353config ARM_CPU_TOPOLOGY
1354	bool "Support cpu topology definition"
1355	depends on SMP && CPU_V7
1356	default y
1357	help
1358	  Support ARM cpu topology definition. The MPIDR register defines
1359	  affinity between processors which is then used to describe the cpu
1360	  topology of an ARM System.
1361
1362config SCHED_MC
1363	bool "Multi-core scheduler support"
1364	depends on ARM_CPU_TOPOLOGY
1365	help
1366	  Multi-core scheduler support improves the CPU scheduler's decision
1367	  making when dealing with multi-core CPU chips at a cost of slightly
1368	  increased overhead in some places. If unsure say N here.
1369
1370config SCHED_SMT
1371	bool "SMT scheduler support"
1372	depends on ARM_CPU_TOPOLOGY
1373	help
1374	  Improves the CPU scheduler's decision making when dealing with
1375	  MultiThreading at a cost of slightly increased overhead in some
1376	  places. If unsure say N here.
1377
1378config HAVE_ARM_SCU
1379	bool
1380	help
1381	  This option enables support for the ARM system coherency unit
1382
1383config HAVE_ARM_ARCH_TIMER
1384	bool "Architected timer support"
1385	depends on CPU_V7
1386	select ARM_ARCH_TIMER
1387	select GENERIC_CLOCKEVENTS
1388	help
1389	  This option enables support for the ARM architected timer
1390
1391config HAVE_ARM_TWD
1392	bool
1393	depends on SMP
1394	select CLKSRC_OF if OF
1395	help
1396	  This options enables support for the ARM timer and watchdog unit
1397
1398config MCPM
1399	bool "Multi-Cluster Power Management"
1400	depends on CPU_V7 && SMP
1401	help
1402	  This option provides the common power management infrastructure
1403	  for (multi-)cluster based systems, such as big.LITTLE based
1404	  systems.
1405
1406config MCPM_QUAD_CLUSTER
1407	bool
1408	depends on MCPM
1409	help
1410	  To avoid wasting resources unnecessarily, MCPM only supports up
1411	  to 2 clusters by default.
1412	  Platforms with 3 or 4 clusters that use MCPM must select this
1413	  option to allow the additional clusters to be managed.
1414
1415config BIG_LITTLE
1416	bool "big.LITTLE support (Experimental)"
1417	depends on CPU_V7 && SMP
1418	select MCPM
1419	help
1420	  This option enables support selections for the big.LITTLE
1421	  system architecture.
1422
1423config BL_SWITCHER
1424	bool "big.LITTLE switcher support"
1425	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1426	select ARM_CPU_SUSPEND
1427	select CPU_PM
1428	help
1429	  The big.LITTLE "switcher" provides the core functionality to
1430	  transparently handle transition between a cluster of A15's
1431	  and a cluster of A7's in a big.LITTLE system.
1432
1433config BL_SWITCHER_DUMMY_IF
1434	tristate "Simple big.LITTLE switcher user interface"
1435	depends on BL_SWITCHER && DEBUG_KERNEL
1436	help
1437	  This is a simple and dummy char dev interface to control
1438	  the big.LITTLE switcher core code.  It is meant for
1439	  debugging purposes only.
1440
1441choice
1442	prompt "Memory split"
1443	depends on MMU
1444	default VMSPLIT_3G
1445	help
1446	  Select the desired split between kernel and user memory.
1447
1448	  If you are not absolutely sure what you are doing, leave this
1449	  option alone!
1450
1451	config VMSPLIT_3G
1452		bool "3G/1G user/kernel split"
1453	config VMSPLIT_2G
1454		bool "2G/2G user/kernel split"
1455	config VMSPLIT_1G
1456		bool "1G/3G user/kernel split"
1457endchoice
1458
1459config PAGE_OFFSET
1460	hex
1461	default PHYS_OFFSET if !MMU
1462	default 0x40000000 if VMSPLIT_1G
1463	default 0x80000000 if VMSPLIT_2G
1464	default 0xC0000000
1465
1466config NR_CPUS
1467	int "Maximum number of CPUs (2-32)"
1468	range 2 32
1469	depends on SMP
1470	default "4"
1471
1472config HOTPLUG_CPU
1473	bool "Support for hot-pluggable CPUs"
1474	depends on SMP
1475	help
1476	  Say Y here to experiment with turning CPUs off and on.  CPUs
1477	  can be controlled through /sys/devices/system/cpu.
1478
1479config ARM_PSCI
1480	bool "Support for the ARM Power State Coordination Interface (PSCI)"
1481	depends on CPU_V7
1482	help
1483	  Say Y here if you want Linux to communicate with system firmware
1484	  implementing the PSCI specification for CPU-centric power
1485	  management operations described in ARM document number ARM DEN
1486	  0022A ("Power State Coordination Interface System Software on
1487	  ARM processors").
1488
1489# The GPIO number here must be sorted by descending number. In case of
1490# a multiplatform kernel, we just want the highest value required by the
1491# selected platforms.
1492config ARCH_NR_GPIO
1493	int
1494	default 1024 if ARCH_SHMOBILE || ARCH_TEGRA || ARCH_ZYNQ
1495	default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1496		SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1497	default 416 if ARCH_SUNXI
1498	default 392 if ARCH_U8500
1499	default 352 if ARCH_VT8500
1500	default 288 if ARCH_ROCKCHIP
1501	default 264 if MACH_H4700
1502	default 0
1503	help
1504	  Maximum number of GPIOs in the system.
1505
1506	  If unsure, leave the default value.
1507
1508source kernel/Kconfig.preempt
1509
1510config HZ_FIXED
1511	int
1512	default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1513		ARCH_S5PV210 || ARCH_EXYNOS4
1514	default AT91_TIMER_HZ if ARCH_AT91
1515	default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1516	default 0
1517
1518choice
1519	depends on HZ_FIXED = 0
1520	prompt "Timer frequency"
1521
1522config HZ_100
1523	bool "100 Hz"
1524
1525config HZ_200
1526	bool "200 Hz"
1527
1528config HZ_250
1529	bool "250 Hz"
1530
1531config HZ_300
1532	bool "300 Hz"
1533
1534config HZ_500
1535	bool "500 Hz"
1536
1537config HZ_1000
1538	bool "1000 Hz"
1539
1540endchoice
1541
1542config HZ
1543	int
1544	default HZ_FIXED if HZ_FIXED != 0
1545	default 100 if HZ_100
1546	default 200 if HZ_200
1547	default 250 if HZ_250
1548	default 300 if HZ_300
1549	default 500 if HZ_500
1550	default 1000
1551
1552config SCHED_HRTICK
1553	def_bool HIGH_RES_TIMERS
1554
1555config THUMB2_KERNEL
1556	bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1557	depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1558	default y if CPU_THUMBONLY
1559	select AEABI
1560	select ARM_ASM_UNIFIED
1561	select ARM_UNWIND
1562	help
1563	  By enabling this option, the kernel will be compiled in
1564	  Thumb-2 mode. A compiler/assembler that understand the unified
1565	  ARM-Thumb syntax is needed.
1566
1567	  If unsure, say N.
1568
1569config THUMB2_AVOID_R_ARM_THM_JUMP11
1570	bool "Work around buggy Thumb-2 short branch relocations in gas"
1571	depends on THUMB2_KERNEL && MODULES
1572	default y
1573	help
1574	  Various binutils versions can resolve Thumb-2 branches to
1575	  locally-defined, preemptible global symbols as short-range "b.n"
1576	  branch instructions.
1577
1578	  This is a problem, because there's no guarantee the final
1579	  destination of the symbol, or any candidate locations for a
1580	  trampoline, are within range of the branch.  For this reason, the
1581	  kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1582	  relocation in modules at all, and it makes little sense to add
1583	  support.
1584
1585	  The symptom is that the kernel fails with an "unsupported
1586	  relocation" error when loading some modules.
1587
1588	  Until fixed tools are available, passing
1589	  -fno-optimize-sibling-calls to gcc should prevent gcc generating
1590	  code which hits this problem, at the cost of a bit of extra runtime
1591	  stack usage in some cases.
1592
1593	  The problem is described in more detail at:
1594	      https://bugs.launchpad.net/binutils-linaro/+bug/725126
1595
1596	  Only Thumb-2 kernels are affected.
1597
1598	  Unless you are sure your tools don't have this problem, say Y.
1599
1600config ARM_ASM_UNIFIED
1601	bool
1602
1603config AEABI
1604	bool "Use the ARM EABI to compile the kernel"
1605	help
1606	  This option allows for the kernel to be compiled using the latest
1607	  ARM ABI (aka EABI).  This is only useful if you are using a user
1608	  space environment that is also compiled with EABI.
1609
1610	  Since there are major incompatibilities between the legacy ABI and
1611	  EABI, especially with regard to structure member alignment, this
1612	  option also changes the kernel syscall calling convention to
1613	  disambiguate both ABIs and allow for backward compatibility support
1614	  (selected with CONFIG_OABI_COMPAT).
1615
1616	  To use this you need GCC version 4.0.0 or later.
1617
1618config OABI_COMPAT
1619	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1620	depends on AEABI && !THUMB2_KERNEL
1621	help
1622	  This option preserves the old syscall interface along with the
1623	  new (ARM EABI) one. It also provides a compatibility layer to
1624	  intercept syscalls that have structure arguments which layout
1625	  in memory differs between the legacy ABI and the new ARM EABI
1626	  (only for non "thumb" binaries). This option adds a tiny
1627	  overhead to all syscalls and produces a slightly larger kernel.
1628
1629	  The seccomp filter system will not be available when this is
1630	  selected, since there is no way yet to sensibly distinguish
1631	  between calling conventions during filtering.
1632
1633	  If you know you'll be using only pure EABI user space then you
1634	  can say N here. If this option is not selected and you attempt
1635	  to execute a legacy ABI binary then the result will be
1636	  UNPREDICTABLE (in fact it can be predicted that it won't work
1637	  at all). If in doubt say N.
1638
1639config ARCH_HAS_HOLES_MEMORYMODEL
1640	bool
1641
1642config ARCH_SPARSEMEM_ENABLE
1643	bool
1644
1645config ARCH_SPARSEMEM_DEFAULT
1646	def_bool ARCH_SPARSEMEM_ENABLE
1647
1648config ARCH_SELECT_MEMORY_MODEL
1649	def_bool ARCH_SPARSEMEM_ENABLE
1650
1651config HAVE_ARCH_PFN_VALID
1652	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1653
1654config HAVE_GENERIC_RCU_GUP
1655	def_bool y
1656	depends on ARM_LPAE
1657
1658config HIGHMEM
1659	bool "High Memory Support"
1660	depends on MMU
1661	help
1662	  The address space of ARM processors is only 4 Gigabytes large
1663	  and it has to accommodate user address space, kernel address
1664	  space as well as some memory mapped IO. That means that, if you
1665	  have a large amount of physical memory and/or IO, not all of the
1666	  memory can be "permanently mapped" by the kernel. The physical
1667	  memory that is not permanently mapped is called "high memory".
1668
1669	  Depending on the selected kernel/user memory split, minimum
1670	  vmalloc space and actual amount of RAM, you may not need this
1671	  option which should result in a slightly faster kernel.
1672
1673	  If unsure, say n.
1674
1675config HIGHPTE
1676	bool "Allocate 2nd-level pagetables from highmem"
1677	depends on HIGHMEM
1678
1679config HW_PERF_EVENTS
1680	bool "Enable hardware performance counter support for perf events"
1681	depends on PERF_EVENTS
1682	default y
1683	help
1684	  Enable hardware performance counter support for perf events. If
1685	  disabled, perf events will use software events only.
1686
1687config SYS_SUPPORTS_HUGETLBFS
1688       def_bool y
1689       depends on ARM_LPAE
1690
1691config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1692       def_bool y
1693       depends on ARM_LPAE
1694
1695config ARCH_WANT_GENERAL_HUGETLB
1696	def_bool y
1697
1698source "mm/Kconfig"
1699
1700config FORCE_MAX_ZONEORDER
1701	int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1702	range 11 64 if ARCH_SHMOBILE_LEGACY
1703	default "12" if SOC_AM33XX
1704	default "9" if SA1111 || ARCH_EFM32
1705	default "11"
1706	help
1707	  The kernel memory allocator divides physically contiguous memory
1708	  blocks into "zones", where each zone is a power of two number of
1709	  pages.  This option selects the largest power of two that the kernel
1710	  keeps in the memory allocator.  If you need to allocate very large
1711	  blocks of physically contiguous memory, then you may need to
1712	  increase this value.
1713
1714	  This config option is actually maximum order plus one. For example,
1715	  a value of 11 means that the largest free memory block is 2^10 pages.
1716
1717config ALIGNMENT_TRAP
1718	bool
1719	depends on CPU_CP15_MMU
1720	default y if !ARCH_EBSA110
1721	select HAVE_PROC_CPU if PROC_FS
1722	help
1723	  ARM processors cannot fetch/store information which is not
1724	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1725	  address divisible by 4. On 32-bit ARM processors, these non-aligned
1726	  fetch/store instructions will be emulated in software if you say
1727	  here, which has a severe performance impact. This is necessary for
1728	  correct operation of some network protocols. With an IP-only
1729	  configuration it is safe to say N, otherwise say Y.
1730
1731config UACCESS_WITH_MEMCPY
1732	bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1733	depends on MMU
1734	default y if CPU_FEROCEON
1735	help
1736	  Implement faster copy_to_user and clear_user methods for CPU
1737	  cores where a 8-word STM instruction give significantly higher
1738	  memory write throughput than a sequence of individual 32bit stores.
1739
1740	  A possible side effect is a slight increase in scheduling latency
1741	  between threads sharing the same address space if they invoke
1742	  such copy operations with large buffers.
1743
1744	  However, if the CPU data cache is using a write-allocate mode,
1745	  this option is unlikely to provide any performance gain.
1746
1747config SECCOMP
1748	bool
1749	prompt "Enable seccomp to safely compute untrusted bytecode"
1750	---help---
1751	  This kernel feature is useful for number crunching applications
1752	  that may need to compute untrusted bytecode during their
1753	  execution. By using pipes or other transports made available to
1754	  the process as file descriptors supporting the read/write
1755	  syscalls, it's possible to isolate those applications in
1756	  their own address space using seccomp. Once seccomp is
1757	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1758	  and the task is only allowed to execute a few safe syscalls
1759	  defined by each seccomp mode.
1760
1761config SWIOTLB
1762	def_bool y
1763
1764config IOMMU_HELPER
1765	def_bool SWIOTLB
1766
1767config XEN_DOM0
1768	def_bool y
1769	depends on XEN
1770
1771config XEN
1772	bool "Xen guest support on ARM"
1773	depends on ARM && AEABI && OF
1774	depends on CPU_V7 && !CPU_V6
1775	depends on !GENERIC_ATOMIC64
1776	depends on MMU
1777	select ARCH_DMA_ADDR_T_64BIT
1778	select ARM_PSCI
1779	select SWIOTLB_XEN
1780	help
1781	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1782
1783endmenu
1784
1785menu "Boot options"
1786
1787config USE_OF
1788	bool "Flattened Device Tree support"
1789	select IRQ_DOMAIN
1790	select OF
1791	select OF_EARLY_FLATTREE
1792	select OF_RESERVED_MEM
1793	help
1794	  Include support for flattened device tree machine descriptions.
1795
1796config ATAGS
1797	bool "Support for the traditional ATAGS boot data passing" if USE_OF
1798	default y
1799	help
1800	  This is the traditional way of passing data to the kernel at boot
1801	  time. If you are solely relying on the flattened device tree (or
1802	  the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1803	  to remove ATAGS support from your kernel binary.  If unsure,
1804	  leave this to y.
1805
1806config DEPRECATED_PARAM_STRUCT
1807	bool "Provide old way to pass kernel parameters"
1808	depends on ATAGS
1809	help
1810	  This was deprecated in 2001 and announced to live on for 5 years.
1811	  Some old boot loaders still use this way.
1812
1813# Compressed boot loader in ROM.  Yes, we really want to ask about
1814# TEXT and BSS so we preserve their values in the config files.
1815config ZBOOT_ROM_TEXT
1816	hex "Compressed ROM boot loader base address"
1817	default "0"
1818	help
1819	  The physical address at which the ROM-able zImage is to be
1820	  placed in the target.  Platforms which normally make use of
1821	  ROM-able zImage formats normally set this to a suitable
1822	  value in their defconfig file.
1823
1824	  If ZBOOT_ROM is not enabled, this has no effect.
1825
1826config ZBOOT_ROM_BSS
1827	hex "Compressed ROM boot loader BSS address"
1828	default "0"
1829	help
1830	  The base address of an area of read/write memory in the target
1831	  for the ROM-able zImage which must be available while the
1832	  decompressor is running. It must be large enough to hold the
1833	  entire decompressed kernel plus an additional 128 KiB.
1834	  Platforms which normally make use of ROM-able zImage formats
1835	  normally set this to a suitable value in their defconfig file.
1836
1837	  If ZBOOT_ROM is not enabled, this has no effect.
1838
1839config ZBOOT_ROM
1840	bool "Compressed boot loader in ROM/flash"
1841	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1842	depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1843	help
1844	  Say Y here if you intend to execute your compressed kernel image
1845	  (zImage) directly from ROM or flash.  If unsure, say N.
1846
1847choice
1848	prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1849	depends on ZBOOT_ROM && ARCH_SH7372
1850	default ZBOOT_ROM_NONE
1851	help
1852	  Include experimental SD/MMC loading code in the ROM-able zImage.
1853	  With this enabled it is possible to write the ROM-able zImage
1854	  kernel image to an MMC or SD card and boot the kernel straight
1855	  from the reset vector. At reset the processor Mask ROM will load
1856	  the first part of the ROM-able zImage which in turn loads the
1857	  rest the kernel image to RAM.
1858
1859config ZBOOT_ROM_NONE
1860	bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1861	help
1862	  Do not load image from SD or MMC
1863
1864config ZBOOT_ROM_MMCIF
1865	bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1866	help
1867	  Load image from MMCIF hardware block.
1868
1869config ZBOOT_ROM_SH_MOBILE_SDHI
1870	bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1871	help
1872	  Load image from SDHI hardware block
1873
1874endchoice
1875
1876config ARM_APPENDED_DTB
1877	bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1878	depends on OF
1879	help
1880	  With this option, the boot code will look for a device tree binary
1881	  (DTB) appended to zImage
1882	  (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1883
1884	  This is meant as a backward compatibility convenience for those
1885	  systems with a bootloader that can't be upgraded to accommodate
1886	  the documented boot protocol using a device tree.
1887
1888	  Beware that there is very little in terms of protection against
1889	  this option being confused by leftover garbage in memory that might
1890	  look like a DTB header after a reboot if no actual DTB is appended
1891	  to zImage.  Do not leave this option active in a production kernel
1892	  if you don't intend to always append a DTB.  Proper passing of the
1893	  location into r2 of a bootloader provided DTB is always preferable
1894	  to this option.
1895
1896config ARM_ATAG_DTB_COMPAT
1897	bool "Supplement the appended DTB with traditional ATAG information"
1898	depends on ARM_APPENDED_DTB
1899	help
1900	  Some old bootloaders can't be updated to a DTB capable one, yet
1901	  they provide ATAGs with memory configuration, the ramdisk address,
1902	  the kernel cmdline string, etc.  Such information is dynamically
1903	  provided by the bootloader and can't always be stored in a static
1904	  DTB.  To allow a device tree enabled kernel to be used with such
1905	  bootloaders, this option allows zImage to extract the information
1906	  from the ATAG list and store it at run time into the appended DTB.
1907
1908choice
1909	prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1910	default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1911
1912config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1913	bool "Use bootloader kernel arguments if available"
1914	help
1915	  Uses the command-line options passed by the boot loader instead of
1916	  the device tree bootargs property. If the boot loader doesn't provide
1917	  any, the device tree bootargs property will be used.
1918
1919config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1920	bool "Extend with bootloader kernel arguments"
1921	help
1922	  The command-line arguments provided by the boot loader will be
1923	  appended to the the device tree bootargs property.
1924
1925endchoice
1926
1927config CMDLINE
1928	string "Default kernel command string"
1929	default ""
1930	help
1931	  On some architectures (EBSA110 and CATS), there is currently no way
1932	  for the boot loader to pass arguments to the kernel. For these
1933	  architectures, you should supply some command-line options at build
1934	  time by entering them here. As a minimum, you should specify the
1935	  memory size and the root device (e.g., mem=64M root=/dev/nfs).
1936
1937choice
1938	prompt "Kernel command line type" if CMDLINE != ""
1939	default CMDLINE_FROM_BOOTLOADER
1940	depends on ATAGS
1941
1942config CMDLINE_FROM_BOOTLOADER
1943	bool "Use bootloader kernel arguments if available"
1944	help
1945	  Uses the command-line options passed by the boot loader. If
1946	  the boot loader doesn't provide any, the default kernel command
1947	  string provided in CMDLINE will be used.
1948
1949config CMDLINE_EXTEND
1950	bool "Extend bootloader kernel arguments"
1951	help
1952	  The command-line arguments provided by the boot loader will be
1953	  appended to the default kernel command string.
1954
1955config CMDLINE_FORCE
1956	bool "Always use the default kernel command string"
1957	help
1958	  Always use the default kernel command string, even if the boot
1959	  loader passes other arguments to the kernel.
1960	  This is useful if you cannot or don't want to change the
1961	  command-line options your boot loader passes to the kernel.
1962endchoice
1963
1964config XIP_KERNEL
1965	bool "Kernel Execute-In-Place from ROM"
1966	depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1967	help
1968	  Execute-In-Place allows the kernel to run from non-volatile storage
1969	  directly addressable by the CPU, such as NOR flash. This saves RAM
1970	  space since the text section of the kernel is not loaded from flash
1971	  to RAM.  Read-write sections, such as the data section and stack,
1972	  are still copied to RAM.  The XIP kernel is not compressed since
1973	  it has to run directly from flash, so it will take more space to
1974	  store it.  The flash address used to link the kernel object files,
1975	  and for storing it, is configuration dependent. Therefore, if you
1976	  say Y here, you must know the proper physical address where to
1977	  store the kernel image depending on your own flash memory usage.
1978
1979	  Also note that the make target becomes "make xipImage" rather than
1980	  "make zImage" or "make Image".  The final kernel binary to put in
1981	  ROM memory will be arch/arm/boot/xipImage.
1982
1983	  If unsure, say N.
1984
1985config XIP_PHYS_ADDR
1986	hex "XIP Kernel Physical Location"
1987	depends on XIP_KERNEL
1988	default "0x00080000"
1989	help
1990	  This is the physical address in your flash memory the kernel will
1991	  be linked for and stored to.  This address is dependent on your
1992	  own flash usage.
1993
1994config KEXEC
1995	bool "Kexec system call (EXPERIMENTAL)"
1996	depends on (!SMP || PM_SLEEP_SMP)
1997	help
1998	  kexec is a system call that implements the ability to shutdown your
1999	  current kernel, and to start another kernel.  It is like a reboot
2000	  but it is independent of the system firmware.   And like a reboot
2001	  you can start any kernel with it, not just Linux.
2002
2003	  It is an ongoing process to be certain the hardware in a machine
2004	  is properly shutdown, so do not be surprised if this code does not
2005	  initially work for you.
2006
2007config ATAGS_PROC
2008	bool "Export atags in procfs"
2009	depends on ATAGS && KEXEC
2010	default y
2011	help
2012	  Should the atags used to boot the kernel be exported in an "atags"
2013	  file in procfs. Useful with kexec.
2014
2015config CRASH_DUMP
2016	bool "Build kdump crash kernel (EXPERIMENTAL)"
2017	help
2018	  Generate crash dump after being started by kexec. This should
2019	  be normally only set in special crash dump kernels which are
2020	  loaded in the main kernel with kexec-tools into a specially
2021	  reserved region and then later executed after a crash by
2022	  kdump/kexec. The crash dump kernel must be compiled to a
2023	  memory address not used by the main kernel
2024
2025	  For more details see Documentation/kdump/kdump.txt
2026
2027config AUTO_ZRELADDR
2028	bool "Auto calculation of the decompressed kernel image address"
2029	help
2030	  ZRELADDR is the physical address where the decompressed kernel
2031	  image will be placed. If AUTO_ZRELADDR is selected, the address
2032	  will be determined at run-time by masking the current IP with
2033	  0xf8000000. This assumes the zImage being placed in the first 128MB
2034	  from start of memory.
2035
2036endmenu
2037
2038menu "CPU Power Management"
2039
2040source "drivers/cpufreq/Kconfig"
2041
2042source "drivers/cpuidle/Kconfig"
2043
2044endmenu
2045
2046menu "Floating point emulation"
2047
2048comment "At least one emulation must be selected"
2049
2050config FPE_NWFPE
2051	bool "NWFPE math emulation"
2052	depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2053	---help---
2054	  Say Y to include the NWFPE floating point emulator in the kernel.
2055	  This is necessary to run most binaries. Linux does not currently
2056	  support floating point hardware so you need to say Y here even if
2057	  your machine has an FPA or floating point co-processor podule.
2058
2059	  You may say N here if you are going to load the Acorn FPEmulator
2060	  early in the bootup.
2061
2062config FPE_NWFPE_XP
2063	bool "Support extended precision"
2064	depends on FPE_NWFPE
2065	help
2066	  Say Y to include 80-bit support in the kernel floating-point
2067	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
2068	  Note that gcc does not generate 80-bit operations by default,
2069	  so in most cases this option only enlarges the size of the
2070	  floating point emulator without any good reason.
2071
2072	  You almost surely want to say N here.
2073
2074config FPE_FASTFPE
2075	bool "FastFPE math emulation (EXPERIMENTAL)"
2076	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2077	---help---
2078	  Say Y here to include the FAST floating point emulator in the kernel.
2079	  This is an experimental much faster emulator which now also has full
2080	  precision for the mantissa.  It does not support any exceptions.
2081	  It is very simple, and approximately 3-6 times faster than NWFPE.
2082
2083	  It should be sufficient for most programs.  It may be not suitable
2084	  for scientific calculations, but you have to check this for yourself.
2085	  If you do not feel you need a faster FP emulation you should better
2086	  choose NWFPE.
2087
2088config VFP
2089	bool "VFP-format floating point maths"
2090	depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2091	help
2092	  Say Y to include VFP support code in the kernel. This is needed
2093	  if your hardware includes a VFP unit.
2094
2095	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
2096	  release notes and additional status information.
2097
2098	  Say N if your target does not have VFP hardware.
2099
2100config VFPv3
2101	bool
2102	depends on VFP
2103	default y if CPU_V7
2104
2105config NEON
2106	bool "Advanced SIMD (NEON) Extension support"
2107	depends on VFPv3 && CPU_V7
2108	help
2109	  Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2110	  Extension.
2111
2112config KERNEL_MODE_NEON
2113	bool "Support for NEON in kernel mode"
2114	depends on NEON && AEABI
2115	help
2116	  Say Y to include support for NEON in kernel mode.
2117
2118endmenu
2119
2120menu "Userspace binary formats"
2121
2122source "fs/Kconfig.binfmt"
2123
2124endmenu
2125
2126menu "Power management options"
2127
2128source "kernel/power/Kconfig"
2129
2130config ARCH_SUSPEND_POSSIBLE
2131	depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2132		CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2133	def_bool y
2134
2135config ARM_CPU_SUSPEND
2136	def_bool PM_SLEEP
2137
2138config ARCH_HIBERNATION_POSSIBLE
2139	bool
2140	depends on MMU
2141	default y if ARCH_SUSPEND_POSSIBLE
2142
2143endmenu
2144
2145source "net/Kconfig"
2146
2147source "drivers/Kconfig"
2148
2149source "fs/Kconfig"
2150
2151source "arch/arm/Kconfig.debug"
2152
2153source "security/Kconfig"
2154
2155source "crypto/Kconfig"
2156if CRYPTO
2157source "arch/arm/crypto/Kconfig"
2158endif
2159
2160source "lib/Kconfig"
2161
2162source "arch/arm/kvm/Kconfig"
2163