xref: /openbmc/linux/arch/arm/Kconfig (revision b96fc2f3)
1config ARM
2	bool
3	default y
4	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
5	select ARCH_HAS_ELF_RANDOMIZE
6	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
7	select ARCH_HAVE_CUSTOM_GPIO_H
8	select ARCH_HAS_GCOV_PROFILE_ALL
9	select ARCH_MIGHT_HAVE_PC_PARPORT
10	select ARCH_SUPPORTS_ATOMIC_RMW
11	select ARCH_USE_BUILTIN_BSWAP
12	select ARCH_USE_CMPXCHG_LOCKREF
13	select ARCH_WANT_IPC_PARSE_VERSION
14	select BUILDTIME_EXTABLE_SORT if MMU
15	select CLONE_BACKWARDS
16	select CPU_PM if (SUSPEND || CPU_IDLE)
17	select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
18	select EDAC_SUPPORT
19	select EDAC_ATOMIC_SCRUB
20	select GENERIC_ALLOCATOR
21	select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
22	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
23	select GENERIC_IDLE_POLL_SETUP
24	select GENERIC_IRQ_PROBE
25	select GENERIC_IRQ_SHOW
26	select GENERIC_IRQ_SHOW_LEVEL
27	select GENERIC_PCI_IOMAP
28	select GENERIC_SCHED_CLOCK
29	select GENERIC_SMP_IDLE_THREAD
30	select GENERIC_STRNCPY_FROM_USER
31	select GENERIC_STRNLEN_USER
32	select HANDLE_DOMAIN_IRQ
33	select HARDIRQS_SW_RESEND
34	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
35	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
36	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32
37	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32
38	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
39	select HAVE_ARCH_TRACEHOOK
40	select HAVE_BPF_JIT
41	select HAVE_CC_STACKPROTECTOR
42	select HAVE_CONTEXT_TRACKING
43	select HAVE_C_RECORDMCOUNT
44	select HAVE_DEBUG_KMEMLEAK
45	select HAVE_DMA_API_DEBUG
46	select HAVE_DMA_ATTRS
47	select HAVE_DMA_CONTIGUOUS if MMU
48	select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32
49	select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
50	select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
51	select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
52	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
53	select HAVE_GENERIC_DMA_COHERENT
54	select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
55	select HAVE_IDE if PCI || ISA || PCMCIA
56	select HAVE_IRQ_TIME_ACCOUNTING
57	select HAVE_KERNEL_GZIP
58	select HAVE_KERNEL_LZ4
59	select HAVE_KERNEL_LZMA
60	select HAVE_KERNEL_LZO
61	select HAVE_KERNEL_XZ
62	select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
63	select HAVE_KRETPROBES if (HAVE_KPROBES)
64	select HAVE_MEMBLOCK
65	select HAVE_MOD_ARCH_SPECIFIC
66	select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
67	select HAVE_OPTPROBES if !THUMB2_KERNEL
68	select HAVE_PERF_EVENTS
69	select HAVE_PERF_REGS
70	select HAVE_PERF_USER_STACK_DUMP
71	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
72	select HAVE_REGS_AND_STACK_ACCESS_API
73	select HAVE_SYSCALL_TRACEPOINTS
74	select HAVE_UID16
75	select HAVE_VIRT_CPU_ACCOUNTING_GEN
76	select IRQ_FORCED_THREADING
77	select MODULES_USE_ELF_REL
78	select NO_BOOTMEM
79	select OLD_SIGACTION
80	select OLD_SIGSUSPEND3
81	select PERF_USE_VMALLOC
82	select RTC_LIB
83	select SYS_SUPPORTS_APM_EMULATION
84	# Above selects are sorted alphabetically; please add new ones
85	# according to that.  Thanks.
86	help
87	  The ARM series is a line of low-power-consumption RISC chip designs
88	  licensed by ARM Ltd and targeted at embedded applications and
89	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
90	  manufactured, but legacy ARM-based PC hardware remains popular in
91	  Europe.  There is an ARM Linux project with a web page at
92	  <http://www.arm.linux.org.uk/>.
93
94config ARM_HAS_SG_CHAIN
95	select ARCH_HAS_SG_CHAIN
96	bool
97
98config NEED_SG_DMA_LENGTH
99	bool
100
101config ARM_DMA_USE_IOMMU
102	bool
103	select ARM_HAS_SG_CHAIN
104	select NEED_SG_DMA_LENGTH
105
106if ARM_DMA_USE_IOMMU
107
108config ARM_DMA_IOMMU_ALIGNMENT
109	int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
110	range 4 9
111	default 8
112	help
113	  DMA mapping framework by default aligns all buffers to the smallest
114	  PAGE_SIZE order which is greater than or equal to the requested buffer
115	  size. This works well for buffers up to a few hundreds kilobytes, but
116	  for larger buffers it just a waste of address space. Drivers which has
117	  relatively small addressing window (like 64Mib) might run out of
118	  virtual space with just a few allocations.
119
120	  With this parameter you can specify the maximum PAGE_SIZE order for
121	  DMA IOMMU buffers. Larger buffers will be aligned only to this
122	  specified order. The order is expressed as a power of two multiplied
123	  by the PAGE_SIZE.
124
125endif
126
127config MIGHT_HAVE_PCI
128	bool
129
130config SYS_SUPPORTS_APM_EMULATION
131	bool
132
133config HAVE_TCM
134	bool
135	select GENERIC_ALLOCATOR
136
137config HAVE_PROC_CPU
138	bool
139
140config NO_IOPORT_MAP
141	bool
142
143config EISA
144	bool
145	---help---
146	  The Extended Industry Standard Architecture (EISA) bus was
147	  developed as an open alternative to the IBM MicroChannel bus.
148
149	  The EISA bus provided some of the features of the IBM MicroChannel
150	  bus while maintaining backward compatibility with cards made for
151	  the older ISA bus.  The EISA bus saw limited use between 1988 and
152	  1995 when it was made obsolete by the PCI bus.
153
154	  Say Y here if you are building a kernel for an EISA-based machine.
155
156	  Otherwise, say N.
157
158config SBUS
159	bool
160
161config STACKTRACE_SUPPORT
162	bool
163	default y
164
165config HAVE_LATENCYTOP_SUPPORT
166	bool
167	depends on !SMP
168	default y
169
170config LOCKDEP_SUPPORT
171	bool
172	default y
173
174config TRACE_IRQFLAGS_SUPPORT
175	bool
176	default !CPU_V7M
177
178config RWSEM_XCHGADD_ALGORITHM
179	bool
180	default y
181
182config ARCH_HAS_ILOG2_U32
183	bool
184
185config ARCH_HAS_ILOG2_U64
186	bool
187
188config ARCH_HAS_BANDGAP
189	bool
190
191config FIX_EARLYCON_MEM
192	def_bool y if MMU
193
194config GENERIC_HWEIGHT
195	bool
196	default y
197
198config GENERIC_CALIBRATE_DELAY
199	bool
200	default y
201
202config ARCH_MAY_HAVE_PC_FDC
203	bool
204
205config ZONE_DMA
206	bool
207
208config NEED_DMA_MAP_STATE
209       def_bool y
210
211config ARCH_SUPPORTS_UPROBES
212	def_bool y
213
214config ARCH_HAS_DMA_SET_COHERENT_MASK
215	bool
216
217config GENERIC_ISA_DMA
218	bool
219
220config FIQ
221	bool
222
223config NEED_RET_TO_USER
224	bool
225
226config ARCH_MTD_XIP
227	bool
228
229config VECTORS_BASE
230	hex
231	default 0xffff0000 if MMU || CPU_HIGH_VECTOR
232	default DRAM_BASE if REMAP_VECTORS_TO_RAM
233	default 0x00000000
234	help
235	  The base address of exception vectors.  This must be two pages
236	  in size.
237
238config ARM_PATCH_PHYS_VIRT
239	bool "Patch physical to virtual translations at runtime" if EMBEDDED
240	default y
241	depends on !XIP_KERNEL && MMU
242	depends on !ARCH_REALVIEW || !SPARSEMEM
243	help
244	  Patch phys-to-virt and virt-to-phys translation functions at
245	  boot and module load time according to the position of the
246	  kernel in system memory.
247
248	  This can only be used with non-XIP MMU kernels where the base
249	  of physical memory is at a 16MB boundary.
250
251	  Only disable this option if you know that you do not require
252	  this feature (eg, building a kernel for a single machine) and
253	  you need to shrink the kernel to the minimal size.
254
255config NEED_MACH_IO_H
256	bool
257	help
258	  Select this when mach/io.h is required to provide special
259	  definitions for this platform.  The need for mach/io.h should
260	  be avoided when possible.
261
262config NEED_MACH_MEMORY_H
263	bool
264	help
265	  Select this when mach/memory.h is required to provide special
266	  definitions for this platform.  The need for mach/memory.h should
267	  be avoided when possible.
268
269config PHYS_OFFSET
270	hex "Physical address of main memory" if MMU
271	depends on !ARM_PATCH_PHYS_VIRT
272	default DRAM_BASE if !MMU
273	default 0x00000000 if ARCH_EBSA110 || \
274			ARCH_FOOTBRIDGE || \
275			ARCH_INTEGRATOR || \
276			ARCH_IOP13XX || \
277			ARCH_KS8695 || \
278			(ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
279	default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
280	default 0x20000000 if ARCH_S5PV210
281	default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
282	default 0xc0000000 if ARCH_SA1100
283	help
284	  Please provide the physical address corresponding to the
285	  location of main memory in your system.
286
287config GENERIC_BUG
288	def_bool y
289	depends on BUG
290
291config PGTABLE_LEVELS
292	int
293	default 3 if ARM_LPAE
294	default 2
295
296source "init/Kconfig"
297
298source "kernel/Kconfig.freezer"
299
300menu "System Type"
301
302config MMU
303	bool "MMU-based Paged Memory Management Support"
304	default y
305	help
306	  Select if you want MMU-based virtualised addressing space
307	  support by paged memory management. If unsure, say 'Y'.
308
309#
310# The "ARM system type" choice list is ordered alphabetically by option
311# text.  Please add new entries in the option alphabetic order.
312#
313choice
314	prompt "ARM system type"
315	default ARCH_VERSATILE if !MMU
316	default ARCH_MULTIPLATFORM if MMU
317
318config ARCH_MULTIPLATFORM
319	bool "Allow multiple platforms to be selected"
320	depends on MMU
321	select ARCH_WANT_OPTIONAL_GPIOLIB
322	select ARM_HAS_SG_CHAIN
323	select ARM_PATCH_PHYS_VIRT
324	select AUTO_ZRELADDR
325	select CLKSRC_OF
326	select COMMON_CLK
327	select GENERIC_CLOCKEVENTS
328	select MIGHT_HAVE_PCI
329	select MULTI_IRQ_HANDLER
330	select SPARSE_IRQ
331	select USE_OF
332
333config ARM_SINGLE_ARMV7M
334	bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
335	depends on !MMU
336	select ARCH_WANT_OPTIONAL_GPIOLIB
337	select ARM_NVIC
338	select AUTO_ZRELADDR
339	select CLKSRC_OF
340	select COMMON_CLK
341	select CPU_V7M
342	select GENERIC_CLOCKEVENTS
343	select NO_IOPORT_MAP
344	select SPARSE_IRQ
345	select USE_OF
346
347config ARCH_REALVIEW
348	bool "ARM Ltd. RealView family"
349	select ARCH_WANT_OPTIONAL_GPIOLIB
350	select ARM_AMBA
351	select ARM_TIMER_SP804
352	select COMMON_CLK
353	select COMMON_CLK_VERSATILE
354	select GENERIC_CLOCKEVENTS
355	select GPIO_PL061 if GPIOLIB
356	select ICST
357	select NEED_MACH_MEMORY_H
358	select PLAT_VERSATILE
359	select PLAT_VERSATILE_SCHED_CLOCK
360	help
361	  This enables support for ARM Ltd RealView boards.
362
363config ARCH_VERSATILE
364	bool "ARM Ltd. Versatile family"
365	select ARCH_WANT_OPTIONAL_GPIOLIB
366	select ARM_AMBA
367	select ARM_TIMER_SP804
368	select ARM_VIC
369	select CLKDEV_LOOKUP
370	select GENERIC_CLOCKEVENTS
371	select HAVE_MACH_CLKDEV
372	select ICST
373	select PLAT_VERSATILE
374	select PLAT_VERSATILE_CLOCK
375	select PLAT_VERSATILE_SCHED_CLOCK
376	select VERSATILE_FPGA_IRQ
377	help
378	  This enables support for ARM Ltd Versatile board.
379
380config ARCH_CLPS711X
381	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
382	select ARCH_REQUIRE_GPIOLIB
383	select AUTO_ZRELADDR
384	select CLKSRC_MMIO
385	select COMMON_CLK
386	select CPU_ARM720T
387	select GENERIC_CLOCKEVENTS
388	select MFD_SYSCON
389	select SOC_BUS
390	help
391	  Support for Cirrus Logic 711x/721x/731x based boards.
392
393config ARCH_GEMINI
394	bool "Cortina Systems Gemini"
395	select ARCH_REQUIRE_GPIOLIB
396	select CLKSRC_MMIO
397	select CPU_FA526
398	select GENERIC_CLOCKEVENTS
399	help
400	  Support for the Cortina Systems Gemini family SoCs
401
402config ARCH_EBSA110
403	bool "EBSA-110"
404	select ARCH_USES_GETTIMEOFFSET
405	select CPU_SA110
406	select ISA
407	select NEED_MACH_IO_H
408	select NEED_MACH_MEMORY_H
409	select NO_IOPORT_MAP
410	help
411	  This is an evaluation board for the StrongARM processor available
412	  from Digital. It has limited hardware on-board, including an
413	  Ethernet interface, two PCMCIA sockets, two serial ports and a
414	  parallel port.
415
416config ARCH_EP93XX
417	bool "EP93xx-based"
418	select ARCH_HAS_HOLES_MEMORYMODEL
419	select ARCH_REQUIRE_GPIOLIB
420	select ARM_AMBA
421	select ARM_PATCH_PHYS_VIRT
422	select ARM_VIC
423	select AUTO_ZRELADDR
424	select CLKDEV_LOOKUP
425	select CLKSRC_MMIO
426	select CPU_ARM920T
427	select GENERIC_CLOCKEVENTS
428	help
429	  This enables support for the Cirrus EP93xx series of CPUs.
430
431config ARCH_FOOTBRIDGE
432	bool "FootBridge"
433	select CPU_SA110
434	select FOOTBRIDGE
435	select GENERIC_CLOCKEVENTS
436	select HAVE_IDE
437	select NEED_MACH_IO_H if !MMU
438	select NEED_MACH_MEMORY_H
439	help
440	  Support for systems based on the DC21285 companion chip
441	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
442
443config ARCH_NETX
444	bool "Hilscher NetX based"
445	select ARM_VIC
446	select CLKSRC_MMIO
447	select CPU_ARM926T
448	select GENERIC_CLOCKEVENTS
449	help
450	  This enables support for systems based on the Hilscher NetX Soc
451
452config ARCH_IOP13XX
453	bool "IOP13xx-based"
454	depends on MMU
455	select CPU_XSC3
456	select NEED_MACH_MEMORY_H
457	select NEED_RET_TO_USER
458	select PCI
459	select PLAT_IOP
460	select VMSPLIT_1G
461	select SPARSE_IRQ
462	help
463	  Support for Intel's IOP13XX (XScale) family of processors.
464
465config ARCH_IOP32X
466	bool "IOP32x-based"
467	depends on MMU
468	select ARCH_REQUIRE_GPIOLIB
469	select CPU_XSCALE
470	select GPIO_IOP
471	select NEED_RET_TO_USER
472	select PCI
473	select PLAT_IOP
474	help
475	  Support for Intel's 80219 and IOP32X (XScale) family of
476	  processors.
477
478config ARCH_IOP33X
479	bool "IOP33x-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 IOP33X (XScale) family of processors.
489
490config ARCH_IXP4XX
491	bool "IXP4xx-based"
492	depends on MMU
493	select ARCH_HAS_DMA_SET_COHERENT_MASK
494	select ARCH_REQUIRE_GPIOLIB
495	select ARCH_SUPPORTS_BIG_ENDIAN
496	select CLKSRC_MMIO
497	select CPU_XSCALE
498	select DMABOUNCE if PCI
499	select GENERIC_CLOCKEVENTS
500	select MIGHT_HAVE_PCI
501	select NEED_MACH_IO_H
502	select USB_EHCI_BIG_ENDIAN_DESC
503	select USB_EHCI_BIG_ENDIAN_MMIO
504	help
505	  Support for Intel's IXP4XX (XScale) family of processors.
506
507config ARCH_DOVE
508	bool "Marvell Dove"
509	select ARCH_REQUIRE_GPIOLIB
510	select CPU_PJ4
511	select GENERIC_CLOCKEVENTS
512	select MIGHT_HAVE_PCI
513	select MVEBU_MBUS
514	select PINCTRL
515	select PINCTRL_DOVE
516	select PLAT_ORION_LEGACY
517	help
518	  Support for the Marvell Dove SoC 88AP510
519
520config ARCH_MV78XX0
521	bool "Marvell MV78xx0"
522	select ARCH_REQUIRE_GPIOLIB
523	select CPU_FEROCEON
524	select GENERIC_CLOCKEVENTS
525	select MVEBU_MBUS
526	select PCI
527	select PLAT_ORION_LEGACY
528	help
529	  Support for the following Marvell MV78xx0 series SoCs:
530	  MV781x0, MV782x0.
531
532config ARCH_ORION5X
533	bool "Marvell Orion"
534	depends on MMU
535	select ARCH_REQUIRE_GPIOLIB
536	select CPU_FEROCEON
537	select GENERIC_CLOCKEVENTS
538	select MVEBU_MBUS
539	select PCI
540	select PLAT_ORION_LEGACY
541	select MULTI_IRQ_HANDLER
542	help
543	  Support for the following Marvell Orion 5x series SoCs:
544	  Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
545	  Orion-2 (5281), Orion-1-90 (6183).
546
547config ARCH_MMP
548	bool "Marvell PXA168/910/MMP2"
549	depends on MMU
550	select ARCH_REQUIRE_GPIOLIB
551	select CLKDEV_LOOKUP
552	select GENERIC_ALLOCATOR
553	select GENERIC_CLOCKEVENTS
554	select GPIO_PXA
555	select IRQ_DOMAIN
556	select MULTI_IRQ_HANDLER
557	select PINCTRL
558	select PLAT_PXA
559	select SPARSE_IRQ
560	help
561	  Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
562
563config ARCH_KS8695
564	bool "Micrel/Kendin KS8695"
565	select ARCH_REQUIRE_GPIOLIB
566	select CLKSRC_MMIO
567	select CPU_ARM922T
568	select GENERIC_CLOCKEVENTS
569	select NEED_MACH_MEMORY_H
570	help
571	  Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
572	  System-on-Chip devices.
573
574config ARCH_W90X900
575	bool "Nuvoton W90X900 CPU"
576	select ARCH_REQUIRE_GPIOLIB
577	select CLKDEV_LOOKUP
578	select CLKSRC_MMIO
579	select CPU_ARM926T
580	select GENERIC_CLOCKEVENTS
581	help
582	  Support for Nuvoton (Winbond logic dept.) ARM9 processor,
583	  At present, the w90x900 has been renamed nuc900, regarding
584	  the ARM series product line, you can login the following
585	  link address to know more.
586
587	  <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
588		ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
589
590config ARCH_LPC32XX
591	bool "NXP LPC32XX"
592	select ARCH_REQUIRE_GPIOLIB
593	select ARM_AMBA
594	select CLKDEV_LOOKUP
595	select CLKSRC_MMIO
596	select CPU_ARM926T
597	select GENERIC_CLOCKEVENTS
598	select HAVE_IDE
599	select USE_OF
600	help
601	  Support for the NXP LPC32XX family of processors
602
603config ARCH_PXA
604	bool "PXA2xx/PXA3xx-based"
605	depends on MMU
606	select ARCH_MTD_XIP
607	select ARCH_REQUIRE_GPIOLIB
608	select ARM_CPU_SUSPEND if PM
609	select AUTO_ZRELADDR
610	select COMMON_CLK
611	select CLKDEV_LOOKUP
612	select CLKSRC_MMIO
613	select CLKSRC_OF
614	select GENERIC_CLOCKEVENTS
615	select GPIO_PXA
616	select HAVE_IDE
617	select IRQ_DOMAIN
618	select MULTI_IRQ_HANDLER
619	select PLAT_PXA
620	select SPARSE_IRQ
621	help
622	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
623
624config ARCH_RPC
625	bool "RiscPC"
626	select ARCH_ACORN
627	select ARCH_MAY_HAVE_PC_FDC
628	select ARCH_SPARSEMEM_ENABLE
629	select ARCH_USES_GETTIMEOFFSET
630	select CPU_SA110
631	select FIQ
632	select HAVE_IDE
633	select HAVE_PATA_PLATFORM
634	select ISA_DMA_API
635	select NEED_MACH_IO_H
636	select NEED_MACH_MEMORY_H
637	select NO_IOPORT_MAP
638	select VIRT_TO_BUS
639	help
640	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
641	  CD-ROM interface, serial and parallel port, and the floppy drive.
642
643config ARCH_SA1100
644	bool "SA1100-based"
645	select ARCH_MTD_XIP
646	select ARCH_REQUIRE_GPIOLIB
647	select ARCH_SPARSEMEM_ENABLE
648	select CLKDEV_LOOKUP
649	select CLKSRC_MMIO
650	select CPU_FREQ
651	select CPU_SA1100
652	select GENERIC_CLOCKEVENTS
653	select HAVE_IDE
654	select IRQ_DOMAIN
655	select ISA
656	select MULTI_IRQ_HANDLER
657	select NEED_MACH_MEMORY_H
658	select SPARSE_IRQ
659	help
660	  Support for StrongARM 11x0 based boards.
661
662config ARCH_S3C24XX
663	bool "Samsung S3C24XX SoCs"
664	select ARCH_REQUIRE_GPIOLIB
665	select ATAGS
666	select CLKDEV_LOOKUP
667	select CLKSRC_SAMSUNG_PWM
668	select GENERIC_CLOCKEVENTS
669	select GPIO_SAMSUNG
670	select HAVE_S3C2410_I2C if I2C
671	select HAVE_S3C2410_WATCHDOG if WATCHDOG
672	select HAVE_S3C_RTC if RTC_CLASS
673	select MULTI_IRQ_HANDLER
674	select NEED_MACH_IO_H
675	select SAMSUNG_ATAGS
676	help
677	  Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
678	  and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
679	  (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
680	  Samsung SMDK2410 development board (and derivatives).
681
682config ARCH_S3C64XX
683	bool "Samsung S3C64XX"
684	select ARCH_REQUIRE_GPIOLIB
685	select ARM_AMBA
686	select ARM_VIC
687	select ATAGS
688	select CLKDEV_LOOKUP
689	select CLKSRC_SAMSUNG_PWM
690	select COMMON_CLK_SAMSUNG
691	select CPU_V6K
692	select GENERIC_CLOCKEVENTS
693	select GPIO_SAMSUNG
694	select HAVE_S3C2410_I2C if I2C
695	select HAVE_S3C2410_WATCHDOG if WATCHDOG
696	select HAVE_TCM
697	select NO_IOPORT_MAP
698	select PLAT_SAMSUNG
699	select PM_GENERIC_DOMAINS if PM
700	select S3C_DEV_NAND
701	select S3C_GPIO_TRACK
702	select SAMSUNG_ATAGS
703	select SAMSUNG_WAKEMASK
704	select SAMSUNG_WDT_RESET
705	help
706	  Samsung S3C64XX series based systems
707
708config ARCH_DAVINCI
709	bool "TI DaVinci"
710	select ARCH_HAS_HOLES_MEMORYMODEL
711	select ARCH_REQUIRE_GPIOLIB
712	select CLKDEV_LOOKUP
713	select GENERIC_ALLOCATOR
714	select GENERIC_CLOCKEVENTS
715	select GENERIC_IRQ_CHIP
716	select HAVE_IDE
717	select TI_PRIV_EDMA
718	select USE_OF
719	select ZONE_DMA
720	help
721	  Support for TI's DaVinci platform.
722
723config ARCH_OMAP1
724	bool "TI OMAP1"
725	depends on MMU
726	select ARCH_HAS_HOLES_MEMORYMODEL
727	select ARCH_OMAP
728	select ARCH_REQUIRE_GPIOLIB
729	select CLKDEV_LOOKUP
730	select CLKSRC_MMIO
731	select GENERIC_CLOCKEVENTS
732	select GENERIC_IRQ_CHIP
733	select HAVE_IDE
734	select IRQ_DOMAIN
735	select MULTI_IRQ_HANDLER
736	select NEED_MACH_IO_H if PCCARD
737	select NEED_MACH_MEMORY_H
738	select SPARSE_IRQ
739	help
740	  Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
741
742endchoice
743
744menu "Multiple platform selection"
745	depends on ARCH_MULTIPLATFORM
746
747comment "CPU Core family selection"
748
749config ARCH_MULTI_V4
750	bool "ARMv4 based platforms (FA526)"
751	depends on !ARCH_MULTI_V6_V7
752	select ARCH_MULTI_V4_V5
753	select CPU_FA526
754
755config ARCH_MULTI_V4T
756	bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
757	depends on !ARCH_MULTI_V6_V7
758	select ARCH_MULTI_V4_V5
759	select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
760		CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
761		CPU_ARM925T || CPU_ARM940T)
762
763config ARCH_MULTI_V5
764	bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
765	depends on !ARCH_MULTI_V6_V7
766	select ARCH_MULTI_V4_V5
767	select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
768		CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
769		CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
770
771config ARCH_MULTI_V4_V5
772	bool
773
774config ARCH_MULTI_V6
775	bool "ARMv6 based platforms (ARM11)"
776	select ARCH_MULTI_V6_V7
777	select CPU_V6K
778
779config ARCH_MULTI_V7
780	bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
781	default y
782	select ARCH_MULTI_V6_V7
783	select CPU_V7
784	select HAVE_SMP
785
786config ARCH_MULTI_V6_V7
787	bool
788	select MIGHT_HAVE_CACHE_L2X0
789
790config ARCH_MULTI_CPU_AUTO
791	def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
792	select ARCH_MULTI_V5
793
794endmenu
795
796config ARCH_VIRT
797	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
798	select ARM_AMBA
799	select ARM_GIC
800	select ARM_PSCI
801	select HAVE_ARM_ARCH_TIMER
802
803#
804# This is sorted alphabetically by mach-* pathname.  However, plat-*
805# Kconfigs may be included either alphabetically (according to the
806# plat- suffix) or along side the corresponding mach-* source.
807#
808source "arch/arm/mach-mvebu/Kconfig"
809
810source "arch/arm/mach-alpine/Kconfig"
811
812source "arch/arm/mach-asm9260/Kconfig"
813
814source "arch/arm/mach-at91/Kconfig"
815
816source "arch/arm/mach-axxia/Kconfig"
817
818source "arch/arm/mach-bcm/Kconfig"
819
820source "arch/arm/mach-berlin/Kconfig"
821
822source "arch/arm/mach-clps711x/Kconfig"
823
824source "arch/arm/mach-cns3xxx/Kconfig"
825
826source "arch/arm/mach-davinci/Kconfig"
827
828source "arch/arm/mach-digicolor/Kconfig"
829
830source "arch/arm/mach-dove/Kconfig"
831
832source "arch/arm/mach-ep93xx/Kconfig"
833
834source "arch/arm/mach-footbridge/Kconfig"
835
836source "arch/arm/mach-gemini/Kconfig"
837
838source "arch/arm/mach-highbank/Kconfig"
839
840source "arch/arm/mach-hisi/Kconfig"
841
842source "arch/arm/mach-integrator/Kconfig"
843
844source "arch/arm/mach-iop32x/Kconfig"
845
846source "arch/arm/mach-iop33x/Kconfig"
847
848source "arch/arm/mach-iop13xx/Kconfig"
849
850source "arch/arm/mach-ixp4xx/Kconfig"
851
852source "arch/arm/mach-keystone/Kconfig"
853
854source "arch/arm/mach-ks8695/Kconfig"
855
856source "arch/arm/mach-meson/Kconfig"
857
858source "arch/arm/mach-moxart/Kconfig"
859
860source "arch/arm/mach-mv78xx0/Kconfig"
861
862source "arch/arm/mach-imx/Kconfig"
863
864source "arch/arm/mach-mediatek/Kconfig"
865
866source "arch/arm/mach-mxs/Kconfig"
867
868source "arch/arm/mach-netx/Kconfig"
869
870source "arch/arm/mach-nomadik/Kconfig"
871
872source "arch/arm/mach-nspire/Kconfig"
873
874source "arch/arm/plat-omap/Kconfig"
875
876source "arch/arm/mach-omap1/Kconfig"
877
878source "arch/arm/mach-omap2/Kconfig"
879
880source "arch/arm/mach-orion5x/Kconfig"
881
882source "arch/arm/mach-picoxcell/Kconfig"
883
884source "arch/arm/mach-pxa/Kconfig"
885source "arch/arm/plat-pxa/Kconfig"
886
887source "arch/arm/mach-mmp/Kconfig"
888
889source "arch/arm/mach-qcom/Kconfig"
890
891source "arch/arm/mach-realview/Kconfig"
892
893source "arch/arm/mach-rockchip/Kconfig"
894
895source "arch/arm/mach-sa1100/Kconfig"
896
897source "arch/arm/mach-socfpga/Kconfig"
898
899source "arch/arm/mach-spear/Kconfig"
900
901source "arch/arm/mach-sti/Kconfig"
902
903source "arch/arm/mach-s3c24xx/Kconfig"
904
905source "arch/arm/mach-s3c64xx/Kconfig"
906
907source "arch/arm/mach-s5pv210/Kconfig"
908
909source "arch/arm/mach-exynos/Kconfig"
910source "arch/arm/plat-samsung/Kconfig"
911
912source "arch/arm/mach-shmobile/Kconfig"
913
914source "arch/arm/mach-sunxi/Kconfig"
915
916source "arch/arm/mach-prima2/Kconfig"
917
918source "arch/arm/mach-tegra/Kconfig"
919
920source "arch/arm/mach-u300/Kconfig"
921
922source "arch/arm/mach-uniphier/Kconfig"
923
924source "arch/arm/mach-ux500/Kconfig"
925
926source "arch/arm/mach-versatile/Kconfig"
927
928source "arch/arm/mach-vexpress/Kconfig"
929source "arch/arm/plat-versatile/Kconfig"
930
931source "arch/arm/mach-vt8500/Kconfig"
932
933source "arch/arm/mach-w90x900/Kconfig"
934
935source "arch/arm/mach-zx/Kconfig"
936
937source "arch/arm/mach-zynq/Kconfig"
938
939# ARMv7-M architecture
940config ARCH_EFM32
941	bool "Energy Micro efm32"
942	depends on ARM_SINGLE_ARMV7M
943	select ARCH_REQUIRE_GPIOLIB
944	help
945	  Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
946	  processors.
947
948config ARCH_LPC18XX
949	bool "NXP LPC18xx/LPC43xx"
950	depends on ARM_SINGLE_ARMV7M
951	select ARCH_HAS_RESET_CONTROLLER
952	select ARM_AMBA
953	select CLKSRC_LPC32XX
954	select PINCTRL
955	help
956	  Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
957	  high performance microcontrollers.
958
959config ARCH_STM32
960	bool "STMicrolectronics STM32"
961	depends on ARM_SINGLE_ARMV7M
962	select ARCH_HAS_RESET_CONTROLLER
963	select ARMV7M_SYSTICK
964	select CLKSRC_STM32
965	select RESET_CONTROLLER
966	help
967	  Support for STMicroelectronics STM32 processors.
968
969# Definitions to make life easier
970config ARCH_ACORN
971	bool
972
973config PLAT_IOP
974	bool
975	select GENERIC_CLOCKEVENTS
976
977config PLAT_ORION
978	bool
979	select CLKSRC_MMIO
980	select COMMON_CLK
981	select GENERIC_IRQ_CHIP
982	select IRQ_DOMAIN
983
984config PLAT_ORION_LEGACY
985	bool
986	select PLAT_ORION
987
988config PLAT_PXA
989	bool
990
991config PLAT_VERSATILE
992	bool
993
994source "arch/arm/firmware/Kconfig"
995
996source arch/arm/mm/Kconfig
997
998config IWMMXT
999	bool "Enable iWMMXt support"
1000	depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1001	default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1002	help
1003	  Enable support for iWMMXt context switching at run time if
1004	  running on a CPU that supports it.
1005
1006config MULTI_IRQ_HANDLER
1007	bool
1008	help
1009	  Allow each machine to specify it's own IRQ handler at run time.
1010
1011if !MMU
1012source "arch/arm/Kconfig-nommu"
1013endif
1014
1015config PJ4B_ERRATA_4742
1016	bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1017	depends on CPU_PJ4B && MACH_ARMADA_370
1018	default y
1019	help
1020	  When coming out of either a Wait for Interrupt (WFI) or a Wait for
1021	  Event (WFE) IDLE states, a specific timing sensitivity exists between
1022	  the retiring WFI/WFE instructions and the newly issued subsequent
1023	  instructions.  This sensitivity can result in a CPU hang scenario.
1024	  Workaround:
1025	  The software must insert either a Data Synchronization Barrier (DSB)
1026	  or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1027	  instruction
1028
1029config ARM_ERRATA_326103
1030	bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1031	depends on CPU_V6
1032	help
1033	  Executing a SWP instruction to read-only memory does not set bit 11
1034	  of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1035	  treat the access as a read, preventing a COW from occurring and
1036	  causing the faulting task to livelock.
1037
1038config ARM_ERRATA_411920
1039	bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1040	depends on CPU_V6 || CPU_V6K
1041	help
1042	  Invalidation of the Instruction Cache operation can
1043	  fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1044	  It does not affect the MPCore. This option enables the ARM Ltd.
1045	  recommended workaround.
1046
1047config ARM_ERRATA_430973
1048	bool "ARM errata: Stale prediction on replaced interworking branch"
1049	depends on CPU_V7
1050	help
1051	  This option enables the workaround for the 430973 Cortex-A8
1052	  r1p* erratum. If a code sequence containing an ARM/Thumb
1053	  interworking branch is replaced with another code sequence at the
1054	  same virtual address, whether due to self-modifying code or virtual
1055	  to physical address re-mapping, Cortex-A8 does not recover from the
1056	  stale interworking branch prediction. This results in Cortex-A8
1057	  executing the new code sequence in the incorrect ARM or Thumb state.
1058	  The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1059	  and also flushes the branch target cache at every context switch.
1060	  Note that setting specific bits in the ACTLR register may not be
1061	  available in non-secure mode.
1062
1063config ARM_ERRATA_458693
1064	bool "ARM errata: Processor deadlock when a false hazard is created"
1065	depends on CPU_V7
1066	depends on !ARCH_MULTIPLATFORM
1067	help
1068	  This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1069	  erratum. For very specific sequences of memory operations, it is
1070	  possible for a hazard condition intended for a cache line to instead
1071	  be incorrectly associated with a different cache line. This false
1072	  hazard might then cause a processor deadlock. The workaround enables
1073	  the L1 caching of the NEON accesses and disables the PLD instruction
1074	  in the ACTLR register. Note that setting specific bits in the ACTLR
1075	  register may not be available in non-secure mode.
1076
1077config ARM_ERRATA_460075
1078	bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1079	depends on CPU_V7
1080	depends on !ARCH_MULTIPLATFORM
1081	help
1082	  This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1083	  erratum. Any asynchronous access to the L2 cache may encounter a
1084	  situation in which recent store transactions to the L2 cache are lost
1085	  and overwritten with stale memory contents from external memory. The
1086	  workaround disables the write-allocate mode for the L2 cache via the
1087	  ACTLR register. Note that setting specific bits in the ACTLR register
1088	  may not be available in non-secure mode.
1089
1090config ARM_ERRATA_742230
1091	bool "ARM errata: DMB operation may be faulty"
1092	depends on CPU_V7 && SMP
1093	depends on !ARCH_MULTIPLATFORM
1094	help
1095	  This option enables the workaround for the 742230 Cortex-A9
1096	  (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1097	  between two write operations may not ensure the correct visibility
1098	  ordering of the two writes. This workaround sets a specific bit in
1099	  the diagnostic register of the Cortex-A9 which causes the DMB
1100	  instruction to behave as a DSB, ensuring the correct behaviour of
1101	  the two writes.
1102
1103config ARM_ERRATA_742231
1104	bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1105	depends on CPU_V7 && SMP
1106	depends on !ARCH_MULTIPLATFORM
1107	help
1108	  This option enables the workaround for the 742231 Cortex-A9
1109	  (r2p0..r2p2) erratum. Under certain conditions, specific to the
1110	  Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1111	  accessing some data located in the same cache line, may get corrupted
1112	  data due to bad handling of the address hazard when the line gets
1113	  replaced from one of the CPUs at the same time as another CPU is
1114	  accessing it. This workaround sets specific bits in the diagnostic
1115	  register of the Cortex-A9 which reduces the linefill issuing
1116	  capabilities of the processor.
1117
1118config ARM_ERRATA_643719
1119	bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1120	depends on CPU_V7 && SMP
1121	default y
1122	help
1123	  This option enables the workaround for the 643719 Cortex-A9 (prior to
1124	  r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1125	  register returns zero when it should return one. The workaround
1126	  corrects this value, ensuring cache maintenance operations which use
1127	  it behave as intended and avoiding data corruption.
1128
1129config ARM_ERRATA_720789
1130	bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1131	depends on CPU_V7
1132	help
1133	  This option enables the workaround for the 720789 Cortex-A9 (prior to
1134	  r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1135	  broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1136	  As a consequence of this erratum, some TLB entries which should be
1137	  invalidated are not, resulting in an incoherency in the system page
1138	  tables. The workaround changes the TLB flushing routines to invalidate
1139	  entries regardless of the ASID.
1140
1141config ARM_ERRATA_743622
1142	bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1143	depends on CPU_V7
1144	depends on !ARCH_MULTIPLATFORM
1145	help
1146	  This option enables the workaround for the 743622 Cortex-A9
1147	  (r2p*) erratum. Under very rare conditions, a faulty
1148	  optimisation in the Cortex-A9 Store Buffer may lead to data
1149	  corruption. This workaround sets a specific bit in the diagnostic
1150	  register of the Cortex-A9 which disables the Store Buffer
1151	  optimisation, preventing the defect from occurring. This has no
1152	  visible impact on the overall performance or power consumption of the
1153	  processor.
1154
1155config ARM_ERRATA_751472
1156	bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1157	depends on CPU_V7
1158	depends on !ARCH_MULTIPLATFORM
1159	help
1160	  This option enables the workaround for the 751472 Cortex-A9 (prior
1161	  to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1162	  completion of a following broadcasted operation if the second
1163	  operation is received by a CPU before the ICIALLUIS has completed,
1164	  potentially leading to corrupted entries in the cache or TLB.
1165
1166config ARM_ERRATA_754322
1167	bool "ARM errata: possible faulty MMU translations following an ASID switch"
1168	depends on CPU_V7
1169	help
1170	  This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1171	  r3p*) erratum. A speculative memory access may cause a page table walk
1172	  which starts prior to an ASID switch but completes afterwards. This
1173	  can populate the micro-TLB with a stale entry which may be hit with
1174	  the new ASID. This workaround places two dsb instructions in the mm
1175	  switching code so that no page table walks can cross the ASID switch.
1176
1177config ARM_ERRATA_754327
1178	bool "ARM errata: no automatic Store Buffer drain"
1179	depends on CPU_V7 && SMP
1180	help
1181	  This option enables the workaround for the 754327 Cortex-A9 (prior to
1182	  r2p0) erratum. The Store Buffer does not have any automatic draining
1183	  mechanism and therefore a livelock may occur if an external agent
1184	  continuously polls a memory location waiting to observe an update.
1185	  This workaround defines cpu_relax() as smp_mb(), preventing correctly
1186	  written polling loops from denying visibility of updates to memory.
1187
1188config ARM_ERRATA_364296
1189	bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1190	depends on CPU_V6
1191	help
1192	  This options enables the workaround for the 364296 ARM1136
1193	  r0p2 erratum (possible cache data corruption with
1194	  hit-under-miss enabled). It sets the undocumented bit 31 in
1195	  the auxiliary control register and the FI bit in the control
1196	  register, thus disabling hit-under-miss without putting the
1197	  processor into full low interrupt latency mode. ARM11MPCore
1198	  is not affected.
1199
1200config ARM_ERRATA_764369
1201	bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1202	depends on CPU_V7 && SMP
1203	help
1204	  This option enables the workaround for erratum 764369
1205	  affecting Cortex-A9 MPCore with two or more processors (all
1206	  current revisions). Under certain timing circumstances, a data
1207	  cache line maintenance operation by MVA targeting an Inner
1208	  Shareable memory region may fail to proceed up to either the
1209	  Point of Coherency or to the Point of Unification of the
1210	  system. This workaround adds a DSB instruction before the
1211	  relevant cache maintenance functions and sets a specific bit
1212	  in the diagnostic control register of the SCU.
1213
1214config ARM_ERRATA_775420
1215       bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1216       depends on CPU_V7
1217       help
1218	 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1219	 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1220	 operation aborts with MMU exception, it might cause the processor
1221	 to deadlock. This workaround puts DSB before executing ISB if
1222	 an abort may occur on cache maintenance.
1223
1224config ARM_ERRATA_798181
1225	bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1226	depends on CPU_V7 && SMP
1227	help
1228	  On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1229	  adequately shooting down all use of the old entries. This
1230	  option enables the Linux kernel workaround for this erratum
1231	  which sends an IPI to the CPUs that are running the same ASID
1232	  as the one being invalidated.
1233
1234config ARM_ERRATA_773022
1235	bool "ARM errata: incorrect instructions may be executed from loop buffer"
1236	depends on CPU_V7
1237	help
1238	  This option enables the workaround for the 773022 Cortex-A15
1239	  (up to r0p4) erratum. In certain rare sequences of code, the
1240	  loop buffer may deliver incorrect instructions. This
1241	  workaround disables the loop buffer to avoid the erratum.
1242
1243endmenu
1244
1245source "arch/arm/common/Kconfig"
1246
1247menu "Bus support"
1248
1249config ISA
1250	bool
1251	help
1252	  Find out whether you have ISA slots on your motherboard.  ISA is the
1253	  name of a bus system, i.e. the way the CPU talks to the other stuff
1254	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
1255	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1256	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
1257
1258# Select ISA DMA controller support
1259config ISA_DMA
1260	bool
1261	select ISA_DMA_API
1262
1263# Select ISA DMA interface
1264config ISA_DMA_API
1265	bool
1266
1267config PCI
1268	bool "PCI support" if MIGHT_HAVE_PCI
1269	help
1270	  Find out whether you have a PCI motherboard. PCI is the name of a
1271	  bus system, i.e. the way the CPU talks to the other stuff inside
1272	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1273	  VESA. If you have PCI, say Y, otherwise N.
1274
1275config PCI_DOMAINS
1276	bool
1277	depends on PCI
1278
1279config PCI_DOMAINS_GENERIC
1280	def_bool PCI_DOMAINS
1281
1282config PCI_NANOENGINE
1283	bool "BSE nanoEngine PCI support"
1284	depends on SA1100_NANOENGINE
1285	help
1286	  Enable PCI on the BSE nanoEngine board.
1287
1288config PCI_SYSCALL
1289	def_bool PCI
1290
1291config PCI_HOST_ITE8152
1292	bool
1293	depends on PCI && MACH_ARMCORE
1294	default y
1295	select DMABOUNCE
1296
1297source "drivers/pci/Kconfig"
1298source "drivers/pci/pcie/Kconfig"
1299
1300source "drivers/pcmcia/Kconfig"
1301
1302endmenu
1303
1304menu "Kernel Features"
1305
1306config HAVE_SMP
1307	bool
1308	help
1309	  This option should be selected by machines which have an SMP-
1310	  capable CPU.
1311
1312	  The only effect of this option is to make the SMP-related
1313	  options available to the user for configuration.
1314
1315config SMP
1316	bool "Symmetric Multi-Processing"
1317	depends on CPU_V6K || CPU_V7
1318	depends on GENERIC_CLOCKEVENTS
1319	depends on HAVE_SMP
1320	depends on MMU || ARM_MPU
1321	select IRQ_WORK
1322	help
1323	  This enables support for systems with more than one CPU. If you have
1324	  a system with only one CPU, say N. If you have a system with more
1325	  than one CPU, say Y.
1326
1327	  If you say N here, the kernel will run on uni- and multiprocessor
1328	  machines, but will use only one CPU of a multiprocessor machine. If
1329	  you say Y here, the kernel will run on many, but not all,
1330	  uniprocessor machines. On a uniprocessor machine, the kernel
1331	  will run faster if you say N here.
1332
1333	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
1334	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1335	  <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1336
1337	  If you don't know what to do here, say N.
1338
1339config SMP_ON_UP
1340	bool "Allow booting SMP kernel on uniprocessor systems"
1341	depends on SMP && !XIP_KERNEL && MMU
1342	default y
1343	help
1344	  SMP kernels contain instructions which fail on non-SMP processors.
1345	  Enabling this option allows the kernel to modify itself to make
1346	  these instructions safe.  Disabling it allows about 1K of space
1347	  savings.
1348
1349	  If you don't know what to do here, say Y.
1350
1351config ARM_CPU_TOPOLOGY
1352	bool "Support cpu topology definition"
1353	depends on SMP && CPU_V7
1354	default y
1355	help
1356	  Support ARM cpu topology definition. The MPIDR register defines
1357	  affinity between processors which is then used to describe the cpu
1358	  topology of an ARM System.
1359
1360config SCHED_MC
1361	bool "Multi-core scheduler support"
1362	depends on ARM_CPU_TOPOLOGY
1363	help
1364	  Multi-core scheduler support improves the CPU scheduler's decision
1365	  making when dealing with multi-core CPU chips at a cost of slightly
1366	  increased overhead in some places. If unsure say N here.
1367
1368config SCHED_SMT
1369	bool "SMT scheduler support"
1370	depends on ARM_CPU_TOPOLOGY
1371	help
1372	  Improves the CPU scheduler's decision making when dealing with
1373	  MultiThreading at a cost of slightly increased overhead in some
1374	  places. If unsure say N here.
1375
1376config HAVE_ARM_SCU
1377	bool
1378	help
1379	  This option enables support for the ARM system coherency unit
1380
1381config HAVE_ARM_ARCH_TIMER
1382	bool "Architected timer support"
1383	depends on CPU_V7
1384	select ARM_ARCH_TIMER
1385	select GENERIC_CLOCKEVENTS
1386	help
1387	  This option enables support for the ARM architected timer
1388
1389config HAVE_ARM_TWD
1390	bool
1391	depends on SMP
1392	select CLKSRC_OF if OF
1393	help
1394	  This options enables support for the ARM timer and watchdog unit
1395
1396config MCPM
1397	bool "Multi-Cluster Power Management"
1398	depends on CPU_V7 && SMP
1399	help
1400	  This option provides the common power management infrastructure
1401	  for (multi-)cluster based systems, such as big.LITTLE based
1402	  systems.
1403
1404config MCPM_QUAD_CLUSTER
1405	bool
1406	depends on MCPM
1407	help
1408	  To avoid wasting resources unnecessarily, MCPM only supports up
1409	  to 2 clusters by default.
1410	  Platforms with 3 or 4 clusters that use MCPM must select this
1411	  option to allow the additional clusters to be managed.
1412
1413config BIG_LITTLE
1414	bool "big.LITTLE support (Experimental)"
1415	depends on CPU_V7 && SMP
1416	select MCPM
1417	help
1418	  This option enables support selections for the big.LITTLE
1419	  system architecture.
1420
1421config BL_SWITCHER
1422	bool "big.LITTLE switcher support"
1423	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1424	select ARM_CPU_SUSPEND
1425	select CPU_PM
1426	help
1427	  The big.LITTLE "switcher" provides the core functionality to
1428	  transparently handle transition between a cluster of A15's
1429	  and a cluster of A7's in a big.LITTLE system.
1430
1431config BL_SWITCHER_DUMMY_IF
1432	tristate "Simple big.LITTLE switcher user interface"
1433	depends on BL_SWITCHER && DEBUG_KERNEL
1434	help
1435	  This is a simple and dummy char dev interface to control
1436	  the big.LITTLE switcher core code.  It is meant for
1437	  debugging purposes only.
1438
1439choice
1440	prompt "Memory split"
1441	depends on MMU
1442	default VMSPLIT_3G
1443	help
1444	  Select the desired split between kernel and user memory.
1445
1446	  If you are not absolutely sure what you are doing, leave this
1447	  option alone!
1448
1449	config VMSPLIT_3G
1450		bool "3G/1G user/kernel split"
1451	config VMSPLIT_2G
1452		bool "2G/2G user/kernel split"
1453	config VMSPLIT_1G
1454		bool "1G/3G user/kernel split"
1455endchoice
1456
1457config PAGE_OFFSET
1458	hex
1459	default PHYS_OFFSET if !MMU
1460	default 0x40000000 if VMSPLIT_1G
1461	default 0x80000000 if VMSPLIT_2G
1462	default 0xC0000000
1463
1464config NR_CPUS
1465	int "Maximum number of CPUs (2-32)"
1466	range 2 32
1467	depends on SMP
1468	default "4"
1469
1470config HOTPLUG_CPU
1471	bool "Support for hot-pluggable CPUs"
1472	depends on SMP
1473	help
1474	  Say Y here to experiment with turning CPUs off and on.  CPUs
1475	  can be controlled through /sys/devices/system/cpu.
1476
1477config ARM_PSCI
1478	bool "Support for the ARM Power State Coordination Interface (PSCI)"
1479	depends on CPU_V7
1480	select ARM_PSCI_FW
1481	help
1482	  Say Y here if you want Linux to communicate with system firmware
1483	  implementing the PSCI specification for CPU-centric power
1484	  management operations described in ARM document number ARM DEN
1485	  0022A ("Power State Coordination Interface System Software on
1486	  ARM processors").
1487
1488# The GPIO number here must be sorted by descending number. In case of
1489# a multiplatform kernel, we just want the highest value required by the
1490# selected platforms.
1491config ARCH_NR_GPIO
1492	int
1493	default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1494		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 128 if SOC_AT91RM9200
1515	default 0
1516
1517choice
1518	depends on HZ_FIXED = 0
1519	prompt "Timer frequency"
1520
1521config HZ_100
1522	bool "100 Hz"
1523
1524config HZ_200
1525	bool "200 Hz"
1526
1527config HZ_250
1528	bool "250 Hz"
1529
1530config HZ_300
1531	bool "300 Hz"
1532
1533config HZ_500
1534	bool "500 Hz"
1535
1536config HZ_1000
1537	bool "1000 Hz"
1538
1539endchoice
1540
1541config HZ
1542	int
1543	default HZ_FIXED if HZ_FIXED != 0
1544	default 100 if HZ_100
1545	default 200 if HZ_200
1546	default 250 if HZ_250
1547	default 300 if HZ_300
1548	default 500 if HZ_500
1549	default 1000
1550
1551config SCHED_HRTICK
1552	def_bool HIGH_RES_TIMERS
1553
1554config THUMB2_KERNEL
1555	bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1556	depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1557	default y if CPU_THUMBONLY
1558	select AEABI
1559	select ARM_ASM_UNIFIED
1560	select ARM_UNWIND
1561	help
1562	  By enabling this option, the kernel will be compiled in
1563	  Thumb-2 mode. A compiler/assembler that understand the unified
1564	  ARM-Thumb syntax is needed.
1565
1566	  If unsure, say N.
1567
1568config THUMB2_AVOID_R_ARM_THM_JUMP11
1569	bool "Work around buggy Thumb-2 short branch relocations in gas"
1570	depends on THUMB2_KERNEL && MODULES
1571	default y
1572	help
1573	  Various binutils versions can resolve Thumb-2 branches to
1574	  locally-defined, preemptible global symbols as short-range "b.n"
1575	  branch instructions.
1576
1577	  This is a problem, because there's no guarantee the final
1578	  destination of the symbol, or any candidate locations for a
1579	  trampoline, are within range of the branch.  For this reason, the
1580	  kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1581	  relocation in modules at all, and it makes little sense to add
1582	  support.
1583
1584	  The symptom is that the kernel fails with an "unsupported
1585	  relocation" error when loading some modules.
1586
1587	  Until fixed tools are available, passing
1588	  -fno-optimize-sibling-calls to gcc should prevent gcc generating
1589	  code which hits this problem, at the cost of a bit of extra runtime
1590	  stack usage in some cases.
1591
1592	  The problem is described in more detail at:
1593	      https://bugs.launchpad.net/binutils-linaro/+bug/725126
1594
1595	  Only Thumb-2 kernels are affected.
1596
1597	  Unless you are sure your tools don't have this problem, say Y.
1598
1599config ARM_ASM_UNIFIED
1600	bool
1601
1602config AEABI
1603	bool "Use the ARM EABI to compile the kernel"
1604	help
1605	  This option allows for the kernel to be compiled using the latest
1606	  ARM ABI (aka EABI).  This is only useful if you are using a user
1607	  space environment that is also compiled with EABI.
1608
1609	  Since there are major incompatibilities between the legacy ABI and
1610	  EABI, especially with regard to structure member alignment, this
1611	  option also changes the kernel syscall calling convention to
1612	  disambiguate both ABIs and allow for backward compatibility support
1613	  (selected with CONFIG_OABI_COMPAT).
1614
1615	  To use this you need GCC version 4.0.0 or later.
1616
1617config OABI_COMPAT
1618	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1619	depends on AEABI && !THUMB2_KERNEL
1620	help
1621	  This option preserves the old syscall interface along with the
1622	  new (ARM EABI) one. It also provides a compatibility layer to
1623	  intercept syscalls that have structure arguments which layout
1624	  in memory differs between the legacy ABI and the new ARM EABI
1625	  (only for non "thumb" binaries). This option adds a tiny
1626	  overhead to all syscalls and produces a slightly larger kernel.
1627
1628	  The seccomp filter system will not be available when this is
1629	  selected, since there is no way yet to sensibly distinguish
1630	  between calling conventions during filtering.
1631
1632	  If you know you'll be using only pure EABI user space then you
1633	  can say N here. If this option is not selected and you attempt
1634	  to execute a legacy ABI binary then the result will be
1635	  UNPREDICTABLE (in fact it can be predicted that it won't work
1636	  at all). If in doubt say N.
1637
1638config ARCH_HAS_HOLES_MEMORYMODEL
1639	bool
1640
1641config ARCH_SPARSEMEM_ENABLE
1642	bool
1643
1644config ARCH_SPARSEMEM_DEFAULT
1645	def_bool ARCH_SPARSEMEM_ENABLE
1646
1647config ARCH_SELECT_MEMORY_MODEL
1648	def_bool ARCH_SPARSEMEM_ENABLE
1649
1650config HAVE_ARCH_PFN_VALID
1651	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1652
1653config HAVE_GENERIC_RCU_GUP
1654	def_bool y
1655	depends on ARM_LPAE
1656
1657config HIGHMEM
1658	bool "High Memory Support"
1659	depends on MMU
1660	help
1661	  The address space of ARM processors is only 4 Gigabytes large
1662	  and it has to accommodate user address space, kernel address
1663	  space as well as some memory mapped IO. That means that, if you
1664	  have a large amount of physical memory and/or IO, not all of the
1665	  memory can be "permanently mapped" by the kernel. The physical
1666	  memory that is not permanently mapped is called "high memory".
1667
1668	  Depending on the selected kernel/user memory split, minimum
1669	  vmalloc space and actual amount of RAM, you may not need this
1670	  option which should result in a slightly faster kernel.
1671
1672	  If unsure, say n.
1673
1674config HIGHPTE
1675	bool "Allocate 2nd-level pagetables from highmem"
1676	depends on HIGHMEM
1677	help
1678	  The VM uses one page of physical memory for each page table.
1679	  For systems with a lot of processes, this can use a lot of
1680	  precious low memory, eventually leading to low memory being
1681	  consumed by page tables.  Setting this option will allow
1682	  user-space 2nd level page tables to reside in high memory.
1683
1684config CPU_SW_DOMAIN_PAN
1685	bool "Enable use of CPU domains to implement privileged no-access"
1686	depends on MMU && !ARM_LPAE
1687	default y
1688	help
1689	  Increase kernel security by ensuring that normal kernel accesses
1690	  are unable to access userspace addresses.  This can help prevent
1691	  use-after-free bugs becoming an exploitable privilege escalation
1692	  by ensuring that magic values (such as LIST_POISON) will always
1693	  fault when dereferenced.
1694
1695	  CPUs with low-vector mappings use a best-efforts implementation.
1696	  Their lower 1MB needs to remain accessible for the vectors, but
1697	  the remainder of userspace will become appropriately inaccessible.
1698
1699config HW_PERF_EVENTS
1700	def_bool y
1701	depends on ARM_PMU
1702
1703config SYS_SUPPORTS_HUGETLBFS
1704       def_bool y
1705       depends on ARM_LPAE
1706
1707config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1708       def_bool y
1709       depends on ARM_LPAE
1710
1711config ARCH_WANT_GENERAL_HUGETLB
1712	def_bool y
1713
1714config ARM_MODULE_PLTS
1715	bool "Use PLTs to allow module memory to spill over into vmalloc area"
1716	depends on MODULES
1717	help
1718	  Allocate PLTs when loading modules so that jumps and calls whose
1719	  targets are too far away for their relative offsets to be encoded
1720	  in the instructions themselves can be bounced via veneers in the
1721	  module's PLT. This allows modules to be allocated in the generic
1722	  vmalloc area after the dedicated module memory area has been
1723	  exhausted. The modules will use slightly more memory, but after
1724	  rounding up to page size, the actual memory footprint is usually
1725	  the same.
1726
1727	  Say y if you are getting out of memory errors while loading modules
1728
1729source "mm/Kconfig"
1730
1731config FORCE_MAX_ZONEORDER
1732	int "Maximum zone order"
1733	default "12" if SOC_AM33XX
1734	default "9" if SA1111 || ARCH_EFM32
1735	default "11"
1736	help
1737	  The kernel memory allocator divides physically contiguous memory
1738	  blocks into "zones", where each zone is a power of two number of
1739	  pages.  This option selects the largest power of two that the kernel
1740	  keeps in the memory allocator.  If you need to allocate very large
1741	  blocks of physically contiguous memory, then you may need to
1742	  increase this value.
1743
1744	  This config option is actually maximum order plus one. For example,
1745	  a value of 11 means that the largest free memory block is 2^10 pages.
1746
1747config ALIGNMENT_TRAP
1748	bool
1749	depends on CPU_CP15_MMU
1750	default y if !ARCH_EBSA110
1751	select HAVE_PROC_CPU if PROC_FS
1752	help
1753	  ARM processors cannot fetch/store information which is not
1754	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1755	  address divisible by 4. On 32-bit ARM processors, these non-aligned
1756	  fetch/store instructions will be emulated in software if you say
1757	  here, which has a severe performance impact. This is necessary for
1758	  correct operation of some network protocols. With an IP-only
1759	  configuration it is safe to say N, otherwise say Y.
1760
1761config UACCESS_WITH_MEMCPY
1762	bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1763	depends on MMU
1764	default y if CPU_FEROCEON
1765	help
1766	  Implement faster copy_to_user and clear_user methods for CPU
1767	  cores where a 8-word STM instruction give significantly higher
1768	  memory write throughput than a sequence of individual 32bit stores.
1769
1770	  A possible side effect is a slight increase in scheduling latency
1771	  between threads sharing the same address space if they invoke
1772	  such copy operations with large buffers.
1773
1774	  However, if the CPU data cache is using a write-allocate mode,
1775	  this option is unlikely to provide any performance gain.
1776
1777config SECCOMP
1778	bool
1779	prompt "Enable seccomp to safely compute untrusted bytecode"
1780	---help---
1781	  This kernel feature is useful for number crunching applications
1782	  that may need to compute untrusted bytecode during their
1783	  execution. By using pipes or other transports made available to
1784	  the process as file descriptors supporting the read/write
1785	  syscalls, it's possible to isolate those applications in
1786	  their own address space using seccomp. Once seccomp is
1787	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1788	  and the task is only allowed to execute a few safe syscalls
1789	  defined by each seccomp mode.
1790
1791config SWIOTLB
1792	def_bool y
1793
1794config IOMMU_HELPER
1795	def_bool SWIOTLB
1796
1797config XEN_DOM0
1798	def_bool y
1799	depends on XEN
1800
1801config XEN
1802	bool "Xen guest support on ARM"
1803	depends on ARM && AEABI && OF
1804	depends on CPU_V7 && !CPU_V6
1805	depends on !GENERIC_ATOMIC64
1806	depends on MMU
1807	select ARCH_DMA_ADDR_T_64BIT
1808	select ARM_PSCI
1809	select SWIOTLB_XEN
1810	help
1811	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1812
1813endmenu
1814
1815menu "Boot options"
1816
1817config USE_OF
1818	bool "Flattened Device Tree support"
1819	select IRQ_DOMAIN
1820	select OF
1821	select OF_EARLY_FLATTREE
1822	select OF_RESERVED_MEM
1823	help
1824	  Include support for flattened device tree machine descriptions.
1825
1826config ATAGS
1827	bool "Support for the traditional ATAGS boot data passing" if USE_OF
1828	default y
1829	help
1830	  This is the traditional way of passing data to the kernel at boot
1831	  time. If you are solely relying on the flattened device tree (or
1832	  the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1833	  to remove ATAGS support from your kernel binary.  If unsure,
1834	  leave this to y.
1835
1836config DEPRECATED_PARAM_STRUCT
1837	bool "Provide old way to pass kernel parameters"
1838	depends on ATAGS
1839	help
1840	  This was deprecated in 2001 and announced to live on for 5 years.
1841	  Some old boot loaders still use this way.
1842
1843# Compressed boot loader in ROM.  Yes, we really want to ask about
1844# TEXT and BSS so we preserve their values in the config files.
1845config ZBOOT_ROM_TEXT
1846	hex "Compressed ROM boot loader base address"
1847	default "0"
1848	help
1849	  The physical address at which the ROM-able zImage is to be
1850	  placed in the target.  Platforms which normally make use of
1851	  ROM-able zImage formats normally set this to a suitable
1852	  value in their defconfig file.
1853
1854	  If ZBOOT_ROM is not enabled, this has no effect.
1855
1856config ZBOOT_ROM_BSS
1857	hex "Compressed ROM boot loader BSS address"
1858	default "0"
1859	help
1860	  The base address of an area of read/write memory in the target
1861	  for the ROM-able zImage which must be available while the
1862	  decompressor is running. It must be large enough to hold the
1863	  entire decompressed kernel plus an additional 128 KiB.
1864	  Platforms which normally make use of ROM-able zImage formats
1865	  normally set this to a suitable value in their defconfig file.
1866
1867	  If ZBOOT_ROM is not enabled, this has no effect.
1868
1869config ZBOOT_ROM
1870	bool "Compressed boot loader in ROM/flash"
1871	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1872	depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1873	help
1874	  Say Y here if you intend to execute your compressed kernel image
1875	  (zImage) directly from ROM or flash.  If unsure, say N.
1876
1877config ARM_APPENDED_DTB
1878	bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1879	depends on OF
1880	help
1881	  With this option, the boot code will look for a device tree binary
1882	  (DTB) appended to zImage
1883	  (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1884
1885	  This is meant as a backward compatibility convenience for those
1886	  systems with a bootloader that can't be upgraded to accommodate
1887	  the documented boot protocol using a device tree.
1888
1889	  Beware that there is very little in terms of protection against
1890	  this option being confused by leftover garbage in memory that might
1891	  look like a DTB header after a reboot if no actual DTB is appended
1892	  to zImage.  Do not leave this option active in a production kernel
1893	  if you don't intend to always append a DTB.  Proper passing of the
1894	  location into r2 of a bootloader provided DTB is always preferable
1895	  to this option.
1896
1897config ARM_ATAG_DTB_COMPAT
1898	bool "Supplement the appended DTB with traditional ATAG information"
1899	depends on ARM_APPENDED_DTB
1900	help
1901	  Some old bootloaders can't be updated to a DTB capable one, yet
1902	  they provide ATAGs with memory configuration, the ramdisk address,
1903	  the kernel cmdline string, etc.  Such information is dynamically
1904	  provided by the bootloader and can't always be stored in a static
1905	  DTB.  To allow a device tree enabled kernel to be used with such
1906	  bootloaders, this option allows zImage to extract the information
1907	  from the ATAG list and store it at run time into the appended DTB.
1908
1909choice
1910	prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1911	default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1912
1913config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1914	bool "Use bootloader kernel arguments if available"
1915	help
1916	  Uses the command-line options passed by the boot loader instead of
1917	  the device tree bootargs property. If the boot loader doesn't provide
1918	  any, the device tree bootargs property will be used.
1919
1920config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1921	bool "Extend with bootloader kernel arguments"
1922	help
1923	  The command-line arguments provided by the boot loader will be
1924	  appended to the the device tree bootargs property.
1925
1926endchoice
1927
1928config CMDLINE
1929	string "Default kernel command string"
1930	default ""
1931	help
1932	  On some architectures (EBSA110 and CATS), there is currently no way
1933	  for the boot loader to pass arguments to the kernel. For these
1934	  architectures, you should supply some command-line options at build
1935	  time by entering them here. As a minimum, you should specify the
1936	  memory size and the root device (e.g., mem=64M root=/dev/nfs).
1937
1938choice
1939	prompt "Kernel command line type" if CMDLINE != ""
1940	default CMDLINE_FROM_BOOTLOADER
1941	depends on ATAGS
1942
1943config CMDLINE_FROM_BOOTLOADER
1944	bool "Use bootloader kernel arguments if available"
1945	help
1946	  Uses the command-line options passed by the boot loader. If
1947	  the boot loader doesn't provide any, the default kernel command
1948	  string provided in CMDLINE will be used.
1949
1950config CMDLINE_EXTEND
1951	bool "Extend bootloader kernel arguments"
1952	help
1953	  The command-line arguments provided by the boot loader will be
1954	  appended to the default kernel command string.
1955
1956config CMDLINE_FORCE
1957	bool "Always use the default kernel command string"
1958	help
1959	  Always use the default kernel command string, even if the boot
1960	  loader passes other arguments to the kernel.
1961	  This is useful if you cannot or don't want to change the
1962	  command-line options your boot loader passes to the kernel.
1963endchoice
1964
1965config XIP_KERNEL
1966	bool "Kernel Execute-In-Place from ROM"
1967	depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1968	help
1969	  Execute-In-Place allows the kernel to run from non-volatile storage
1970	  directly addressable by the CPU, such as NOR flash. This saves RAM
1971	  space since the text section of the kernel is not loaded from flash
1972	  to RAM.  Read-write sections, such as the data section and stack,
1973	  are still copied to RAM.  The XIP kernel is not compressed since
1974	  it has to run directly from flash, so it will take more space to
1975	  store it.  The flash address used to link the kernel object files,
1976	  and for storing it, is configuration dependent. Therefore, if you
1977	  say Y here, you must know the proper physical address where to
1978	  store the kernel image depending on your own flash memory usage.
1979
1980	  Also note that the make target becomes "make xipImage" rather than
1981	  "make zImage" or "make Image".  The final kernel binary to put in
1982	  ROM memory will be arch/arm/boot/xipImage.
1983
1984	  If unsure, say N.
1985
1986config XIP_PHYS_ADDR
1987	hex "XIP Kernel Physical Location"
1988	depends on XIP_KERNEL
1989	default "0x00080000"
1990	help
1991	  This is the physical address in your flash memory the kernel will
1992	  be linked for and stored to.  This address is dependent on your
1993	  own flash usage.
1994
1995config KEXEC
1996	bool "Kexec system call (EXPERIMENTAL)"
1997	depends on (!SMP || PM_SLEEP_SMP)
1998	depends on !CPU_V7M
1999	select KEXEC_CORE
2000	help
2001	  kexec is a system call that implements the ability to shutdown your
2002	  current kernel, and to start another kernel.  It is like a reboot
2003	  but it is independent of the system firmware.   And like a reboot
2004	  you can start any kernel with it, not just Linux.
2005
2006	  It is an ongoing process to be certain the hardware in a machine
2007	  is properly shutdown, so do not be surprised if this code does not
2008	  initially work for you.
2009
2010config ATAGS_PROC
2011	bool "Export atags in procfs"
2012	depends on ATAGS && KEXEC
2013	default y
2014	help
2015	  Should the atags used to boot the kernel be exported in an "atags"
2016	  file in procfs. Useful with kexec.
2017
2018config CRASH_DUMP
2019	bool "Build kdump crash kernel (EXPERIMENTAL)"
2020	help
2021	  Generate crash dump after being started by kexec. This should
2022	  be normally only set in special crash dump kernels which are
2023	  loaded in the main kernel with kexec-tools into a specially
2024	  reserved region and then later executed after a crash by
2025	  kdump/kexec. The crash dump kernel must be compiled to a
2026	  memory address not used by the main kernel
2027
2028	  For more details see Documentation/kdump/kdump.txt
2029
2030config AUTO_ZRELADDR
2031	bool "Auto calculation of the decompressed kernel image address"
2032	help
2033	  ZRELADDR is the physical address where the decompressed kernel
2034	  image will be placed. If AUTO_ZRELADDR is selected, the address
2035	  will be determined at run-time by masking the current IP with
2036	  0xf8000000. This assumes the zImage being placed in the first 128MB
2037	  from start of memory.
2038
2039endmenu
2040
2041menu "CPU Power Management"
2042
2043source "drivers/cpufreq/Kconfig"
2044
2045source "drivers/cpuidle/Kconfig"
2046
2047endmenu
2048
2049menu "Floating point emulation"
2050
2051comment "At least one emulation must be selected"
2052
2053config FPE_NWFPE
2054	bool "NWFPE math emulation"
2055	depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2056	---help---
2057	  Say Y to include the NWFPE floating point emulator in the kernel.
2058	  This is necessary to run most binaries. Linux does not currently
2059	  support floating point hardware so you need to say Y here even if
2060	  your machine has an FPA or floating point co-processor podule.
2061
2062	  You may say N here if you are going to load the Acorn FPEmulator
2063	  early in the bootup.
2064
2065config FPE_NWFPE_XP
2066	bool "Support extended precision"
2067	depends on FPE_NWFPE
2068	help
2069	  Say Y to include 80-bit support in the kernel floating-point
2070	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
2071	  Note that gcc does not generate 80-bit operations by default,
2072	  so in most cases this option only enlarges the size of the
2073	  floating point emulator without any good reason.
2074
2075	  You almost surely want to say N here.
2076
2077config FPE_FASTFPE
2078	bool "FastFPE math emulation (EXPERIMENTAL)"
2079	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2080	---help---
2081	  Say Y here to include the FAST floating point emulator in the kernel.
2082	  This is an experimental much faster emulator which now also has full
2083	  precision for the mantissa.  It does not support any exceptions.
2084	  It is very simple, and approximately 3-6 times faster than NWFPE.
2085
2086	  It should be sufficient for most programs.  It may be not suitable
2087	  for scientific calculations, but you have to check this for yourself.
2088	  If you do not feel you need a faster FP emulation you should better
2089	  choose NWFPE.
2090
2091config VFP
2092	bool "VFP-format floating point maths"
2093	depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2094	help
2095	  Say Y to include VFP support code in the kernel. This is needed
2096	  if your hardware includes a VFP unit.
2097
2098	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
2099	  release notes and additional status information.
2100
2101	  Say N if your target does not have VFP hardware.
2102
2103config VFPv3
2104	bool
2105	depends on VFP
2106	default y if CPU_V7
2107
2108config NEON
2109	bool "Advanced SIMD (NEON) Extension support"
2110	depends on VFPv3 && CPU_V7
2111	help
2112	  Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2113	  Extension.
2114
2115config KERNEL_MODE_NEON
2116	bool "Support for NEON in kernel mode"
2117	depends on NEON && AEABI
2118	help
2119	  Say Y to include support for NEON in kernel mode.
2120
2121endmenu
2122
2123menu "Userspace binary formats"
2124
2125source "fs/Kconfig.binfmt"
2126
2127endmenu
2128
2129menu "Power management options"
2130
2131source "kernel/power/Kconfig"
2132
2133config ARCH_SUSPEND_POSSIBLE
2134	depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2135		CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2136	def_bool y
2137
2138config ARM_CPU_SUSPEND
2139	def_bool PM_SLEEP
2140
2141config ARCH_HIBERNATION_POSSIBLE
2142	bool
2143	depends on MMU
2144	default y if ARCH_SUSPEND_POSSIBLE
2145
2146endmenu
2147
2148source "net/Kconfig"
2149
2150source "drivers/Kconfig"
2151
2152source "drivers/firmware/Kconfig"
2153
2154source "fs/Kconfig"
2155
2156source "arch/arm/Kconfig.debug"
2157
2158source "security/Kconfig"
2159
2160source "crypto/Kconfig"
2161if CRYPTO
2162source "arch/arm/crypto/Kconfig"
2163endif
2164
2165source "lib/Kconfig"
2166
2167source "arch/arm/kvm/Kconfig"
2168