Kconfig 62.1 KB
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config ARM
	bool
	default y
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	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
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	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
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	select ARCH_HAVE_CUSTOM_GPIO_H
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	select ARCH_HAS_GCOV_PROFILE_ALL
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	select ARCH_MIGHT_HAVE_PC_PARPORT
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	select ARCH_SUPPORTS_ATOMIC_RMW
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	select ARCH_USE_BUILTIN_BSWAP
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	select ARCH_USE_CMPXCHG_LOCKREF
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	select ARCH_WANT_IPC_PARSE_VERSION
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	select BUILDTIME_EXTABLE_SORT if MMU
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	select CLONE_BACKWARDS
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	select CPU_PM if (SUSPEND || CPU_IDLE)
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	select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
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	select GENERIC_ALLOCATOR
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	select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
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	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
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	select GENERIC_IDLE_POLL_SETUP
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	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	select GENERIC_PCI_IOMAP
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	select GENERIC_SCHED_CLOCK
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	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_STRNCPY_FROM_USER
	select GENERIC_STRNLEN_USER
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	select HANDLE_DOMAIN_IRQ
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	select HARDIRQS_SW_RESEND
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	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
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	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
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	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
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	select HAVE_ARCH_KGDB
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	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
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	select HAVE_ARCH_TRACEHOOK
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	select HAVE_BPF_JIT
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	select HAVE_CC_STACKPROTECTOR
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	select HAVE_CONTEXT_TRACKING
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	select HAVE_C_RECORDMCOUNT
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_API_DEBUG
	select HAVE_DMA_ATTRS
	select HAVE_DMA_CONTIGUOUS if MMU
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	select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
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	select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
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	select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
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	select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
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	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
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	select HAVE_GENERIC_DMA_COHERENT
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	select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
	select HAVE_IDE if PCI || ISA || PCMCIA
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	select HAVE_IRQ_TIME_ACCOUNTING
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	select HAVE_KERNEL_GZIP
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	select HAVE_KERNEL_LZ4
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	select HAVE_KERNEL_LZMA
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	select HAVE_KERNEL_LZO
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	select HAVE_KERNEL_XZ
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	select HAVE_KPROBES if !XIP_KERNEL
	select HAVE_KRETPROBES if (HAVE_KPROBES)
	select HAVE_MEMBLOCK
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	select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
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	select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
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	select HAVE_OPTPROBES if !THUMB2_KERNEL
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	select HAVE_PERF_EVENTS
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	select HAVE_PERF_REGS
	select HAVE_PERF_USER_STACK_DUMP
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	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
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	select HAVE_REGS_AND_STACK_ACCESS_API
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	select HAVE_SYSCALL_TRACEPOINTS
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	select HAVE_UID16
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	select HAVE_VIRT_CPU_ACCOUNTING_GEN
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	select IRQ_FORCED_THREADING
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	select MODULES_USE_ELF_REL
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	select NO_BOOTMEM
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	select OLD_SIGACTION
	select OLD_SIGSUSPEND3
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	select PERF_USE_VMALLOC
	select RTC_LIB
	select SYS_SUPPORTS_APM_EMULATION
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	# Above selects are sorted alphabetically; please add new ones
	# according to that.  Thanks.
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	help
	  The ARM series is a line of low-power-consumption RISC chip designs
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	  licensed by ARM Ltd and targeted at embedded applications and
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	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
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	  manufactured, but legacy ARM-based PC hardware remains popular in
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	  Europe.  There is an ARM Linux project with a web page at
	  <http://www.arm.linux.org.uk/>.

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config ARM_HAS_SG_CHAIN
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	select ARCH_HAS_SG_CHAIN
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	bool

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config NEED_SG_DMA_LENGTH
	bool

config ARM_DMA_USE_IOMMU
	bool
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	select ARM_HAS_SG_CHAIN
	select NEED_SG_DMA_LENGTH
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if ARM_DMA_USE_IOMMU

config ARM_DMA_IOMMU_ALIGNMENT
	int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
	range 4 9
	default 8
	help
	  DMA mapping framework by default aligns all buffers to the smallest
	  PAGE_SIZE order which is greater than or equal to the requested buffer
	  size. This works well for buffers up to a few hundreds kilobytes, but
	  for larger buffers it just a waste of address space. Drivers which has
	  relatively small addressing window (like 64Mib) might run out of
	  virtual space with just a few allocations.

	  With this parameter you can specify the maximum PAGE_SIZE order for
	  DMA IOMMU buffers. Larger buffers will be aligned only to this
	  specified order. The order is expressed as a power of two multiplied
	  by the PAGE_SIZE.

endif

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config MIGHT_HAVE_PCI
	bool

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config SYS_SUPPORTS_APM_EMULATION
	bool

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config HAVE_TCM
	bool
	select GENERIC_ALLOCATOR

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config HAVE_PROC_CPU
	bool

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config NO_IOPORT_MAP
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	bool

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config EISA
	bool
	---help---
	  The Extended Industry Standard Architecture (EISA) bus was
	  developed as an open alternative to the IBM MicroChannel bus.

	  The EISA bus provided some of the features of the IBM MicroChannel
	  bus while maintaining backward compatibility with cards made for
	  the older ISA bus.  The EISA bus saw limited use between 1988 and
	  1995 when it was made obsolete by the PCI bus.

	  Say Y here if you are building a kernel for an EISA-based machine.

	  Otherwise, say N.

config SBUS
	bool

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config STACKTRACE_SUPPORT
	bool
	default y

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config HAVE_LATENCYTOP_SUPPORT
	bool
	depends on !SMP
	default y

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config LOCKDEP_SUPPORT
	bool
	default y

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config TRACE_IRQFLAGS_SUPPORT
	bool
	default y

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config RWSEM_XCHGADD_ALGORITHM
	bool
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	default y
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config ARCH_HAS_ILOG2_U32
	bool

config ARCH_HAS_ILOG2_U64
	bool

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config ARCH_HAS_BANDGAP
	bool

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config GENERIC_HWEIGHT
	bool
	default y

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config GENERIC_CALIBRATE_DELAY
	bool
	default y

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config ARCH_MAY_HAVE_PC_FDC
	bool

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config ZONE_DMA
	bool

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config NEED_DMA_MAP_STATE
       def_bool y

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config ARCH_SUPPORTS_UPROBES
	def_bool y

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config ARCH_HAS_DMA_SET_COHERENT_MASK
	bool

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config GENERIC_ISA_DMA
	bool

config FIQ
	bool

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config NEED_RET_TO_USER
	bool

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config ARCH_MTD_XIP
	bool

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config VECTORS_BASE
	hex
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	default 0xffff0000 if MMU || CPU_HIGH_VECTOR
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	default DRAM_BASE if REMAP_VECTORS_TO_RAM
	default 0x00000000
	help
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	  The base address of exception vectors.  This must be two pages
	  in size.
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config ARM_PATCH_PHYS_VIRT
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	bool "Patch physical to virtual translations at runtime" if EMBEDDED
	default y
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	depends on !XIP_KERNEL && MMU
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	depends on !ARCH_REALVIEW || !SPARSEMEM
	help
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	  Patch phys-to-virt and virt-to-phys translation functions at
	  boot and module load time according to the position of the
	  kernel in system memory.
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	  This can only be used with non-XIP MMU kernels where the base
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	  of physical memory is at a 16MB boundary.
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	  Only disable this option if you know that you do not require
	  this feature (eg, building a kernel for a single machine) and
	  you need to shrink the kernel to the minimal size.
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config NEED_MACH_IO_H
	bool
	help
	  Select this when mach/io.h is required to provide special
	  definitions for this platform.  The need for mach/io.h should
	  be avoided when possible.

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config NEED_MACH_MEMORY_H
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	bool
	help
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	  Select this when mach/memory.h is required to provide special
	  definitions for this platform.  The need for mach/memory.h should
	  be avoided when possible.
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config PHYS_OFFSET
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	hex "Physical address of main memory" if MMU
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	depends on !ARM_PATCH_PHYS_VIRT
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	default DRAM_BASE if !MMU
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	default 0x00000000 if ARCH_EBSA110 || \
			EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
			ARCH_FOOTBRIDGE || \
			ARCH_INTEGRATOR || \
			ARCH_IOP13XX || \
			ARCH_KS8695 || \
			(ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
	default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
	default 0x20000000 if ARCH_S5PV210
	default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
	default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
	default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
	default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
	default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
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	help
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	  Please provide the physical address corresponding to the
	  location of main memory in your system.
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config GENERIC_BUG
	def_bool y
	depends on BUG

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source "init/Kconfig"

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source "kernel/Kconfig.freezer"

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menu "System Type"

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config MMU
	bool "MMU-based Paged Memory Management Support"
	default y
	help
	  Select if you want MMU-based virtualised addressing space
	  support by paged memory management. If unsure, say 'Y'.

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#
# The "ARM system type" choice list is ordered alphabetically by option
# text.  Please add new entries in the option alphabetic order.
#
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choice
	prompt "ARM system type"
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	default ARCH_VERSATILE if !MMU
	default ARCH_MULTIPLATFORM if MMU
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config ARCH_MULTIPLATFORM
	bool "Allow multiple platforms to be selected"
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	depends on MMU
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	select ARCH_WANT_OPTIONAL_GPIOLIB
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	select ARM_HAS_SG_CHAIN
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	select ARM_PATCH_PHYS_VIRT
	select AUTO_ZRELADDR
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	select CLKSRC_OF
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	select COMMON_CLK
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	select GENERIC_CLOCKEVENTS
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	select MIGHT_HAVE_PCI
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	select MULTI_IRQ_HANDLER
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	select SPARSE_IRQ
	select USE_OF

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config ARCH_REALVIEW
	bool "ARM Ltd. RealView family"
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	select ARCH_WANT_OPTIONAL_GPIOLIB
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	select ARM_AMBA
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	select ARM_TIMER_SP804
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	select COMMON_CLK
	select COMMON_CLK_VERSATILE
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	select GENERIC_CLOCKEVENTS
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	select GPIO_PL061 if GPIOLIB
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	select ICST
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	select NEED_MACH_MEMORY_H
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	select PLAT_VERSATILE
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	select PLAT_VERSATILE_SCHED_CLOCK
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	help
	  This enables support for ARM Ltd RealView boards.

config ARCH_VERSATILE
	bool "ARM Ltd. Versatile family"
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	select ARCH_WANT_OPTIONAL_GPIOLIB
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	select ARM_AMBA
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	select ARM_TIMER_SP804
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	select ARM_VIC
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	select CLKDEV_LOOKUP
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	select GENERIC_CLOCKEVENTS
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	select HAVE_MACH_CLKDEV
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	select ICST
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	select PLAT_VERSATILE
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	select PLAT_VERSATILE_CLOCK
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	select PLAT_VERSATILE_SCHED_CLOCK
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	select VERSATILE_FPGA_IRQ
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	help
	  This enables support for ARM Ltd Versatile board.

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config ARCH_CLPS711X
	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
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	select ARCH_REQUIRE_GPIOLIB
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	select AUTO_ZRELADDR
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	select CLKSRC_MMIO
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	select COMMON_CLK
	select CPU_ARM720T
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	select GENERIC_CLOCKEVENTS
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	select MFD_SYSCON
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	select SOC_BUS
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	help
	  Support for Cirrus Logic 711x/721x/731x based boards.

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config ARCH_GEMINI
	bool "Cortina Systems Gemini"
	select ARCH_REQUIRE_GPIOLIB
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	select CLKSRC_MMIO
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	select CPU_FA526
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	select GENERIC_CLOCKEVENTS
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	help
	  Support for the Cortina Systems Gemini family SoCs

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config ARCH_EBSA110
	bool "EBSA-110"
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	select ARCH_USES_GETTIMEOFFSET
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	select CPU_SA110
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	select ISA
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	select NEED_MACH_IO_H
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	select NEED_MACH_MEMORY_H
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	select NO_IOPORT_MAP
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	help
	  This is an evaluation board for the StrongARM processor available
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	  from Digital. It has limited hardware on-board, including an
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	  Ethernet interface, two PCMCIA sockets, two serial ports and a
	  parallel port.

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config ARCH_EFM32
	bool "Energy Micro efm32"
	depends on !MMU
	select ARCH_REQUIRE_GPIOLIB
	select ARM_NVIC
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	select AUTO_ZRELADDR
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	select CLKSRC_OF
	select COMMON_CLK
	select CPU_V7M
	select GENERIC_CLOCKEVENTS
	select NO_DMA
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	select NO_IOPORT_MAP
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	select SPARSE_IRQ
	select USE_OF
	help
	  Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
	  processors.

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config ARCH_EP93XX
	bool "EP93xx-based"
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	select ARCH_HAS_HOLES_MEMORYMODEL
	select ARCH_REQUIRE_GPIOLIB
	select ARCH_USES_GETTIMEOFFSET
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	select ARM_AMBA
	select ARM_VIC
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	select CLKDEV_LOOKUP
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	select CPU_ARM920T
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	help
	  This enables support for the Cirrus EP93xx series of CPUs.

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config ARCH_FOOTBRIDGE
	bool "FootBridge"
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	select CPU_SA110
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	select FOOTBRIDGE
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	select GENERIC_CLOCKEVENTS
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	select HAVE_IDE
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	select NEED_MACH_IO_H if !MMU
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	select NEED_MACH_MEMORY_H
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	help
	  Support for systems based on the DC21285 companion chip
	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
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config ARCH_NETX
	bool "Hilscher NetX based"
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	select ARM_VIC
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	select CLKSRC_MMIO
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	select CPU_ARM926T
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	select GENERIC_CLOCKEVENTS
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	help
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	  This enables support for systems based on the Hilscher NetX Soc

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config ARCH_IOP13XX
	bool "IOP13xx-based"
	depends on MMU
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	select CPU_XSC3
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	select NEED_MACH_MEMORY_H
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	select NEED_RET_TO_USER
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	select PCI
	select PLAT_IOP
	select VMSPLIT_1G
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	select SPARSE_IRQ
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	help
	  Support for Intel's IOP13XX (XScale) family of processors.

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config ARCH_IOP32X
	bool "IOP32x-based"
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	depends on MMU
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_XSCALE
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	select GPIO_IOP
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	select NEED_RET_TO_USER
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	select PCI
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	select PLAT_IOP
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	help
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	  Support for Intel's 80219 and IOP32X (XScale) family of
	  processors.

config ARCH_IOP33X
	bool "IOP33x-based"
	depends on MMU
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_XSCALE
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	select GPIO_IOP
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	select NEED_RET_TO_USER
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	select PCI
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	select PLAT_IOP
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	help
	  Support for Intel's IOP33X (XScale) family of processors.
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config ARCH_IXP4XX
	bool "IXP4xx-based"
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	depends on MMU
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	select ARCH_HAS_DMA_SET_COHERENT_MASK
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	select ARCH_REQUIRE_GPIOLIB
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	select ARCH_SUPPORTS_BIG_ENDIAN
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	select CLKSRC_MMIO
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	select CPU_XSCALE
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	select DMABOUNCE if PCI
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	select GENERIC_CLOCKEVENTS
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	select MIGHT_HAVE_PCI
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	select NEED_MACH_IO_H
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	select USB_EHCI_BIG_ENDIAN_DESC
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	select USB_EHCI_BIG_ENDIAN_MMIO
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	help
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	  Support for Intel's IXP4XX (XScale) family of processors.
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config ARCH_DOVE
	bool "Marvell Dove"
	select ARCH_REQUIRE_GPIOLIB
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	select CPU_PJ4
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	select GENERIC_CLOCKEVENTS
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	select MIGHT_HAVE_PCI
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	select MVEBU_MBUS
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	select PINCTRL
	select PINCTRL_DOVE
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	select PLAT_ORION_LEGACY
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	help
	  Support for the Marvell Dove SoC 88AP510

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config ARCH_MV78XX0
	bool "Marvell MV78xx0"
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_FEROCEON
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	select GENERIC_CLOCKEVENTS
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	select MVEBU_MBUS
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	select PCI
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	select PLAT_ORION_LEGACY
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	help
	  Support for the following Marvell MV78xx0 series SoCs:
	  MV781x0, MV782x0.

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config ARCH_ORION5X
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	bool "Marvell Orion"
	depends on MMU
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_FEROCEON
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	select GENERIC_CLOCKEVENTS
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	select MVEBU_MBUS
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	select PCI
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	select PLAT_ORION_LEGACY
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	help
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	  Support for the following Marvell Orion 5x series SoCs:
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	  Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
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	  Orion-2 (5281), Orion-1-90 (6183).
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config ARCH_MMP
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	bool "Marvell PXA168/910/MMP2"
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	depends on MMU
	select ARCH_REQUIRE_GPIOLIB
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	select CLKDEV_LOOKUP
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	select GENERIC_ALLOCATOR
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	select GENERIC_CLOCKEVENTS
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	select GPIO_PXA
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	select IRQ_DOMAIN
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	select MULTI_IRQ_HANDLER
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	select PINCTRL
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	select PLAT_PXA
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	select SPARSE_IRQ
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	help
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	  Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
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config ARCH_KS8695
	bool "Micrel/Kendin KS8695"
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	select ARCH_REQUIRE_GPIOLIB
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	select CLKSRC_MMIO
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	select CPU_ARM922T
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	select GENERIC_CLOCKEVENTS
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	select NEED_MACH_MEMORY_H
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	help
	  Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
	  System-on-Chip devices.

config ARCH_W90X900
	bool "Nuvoton W90X900 CPU"
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	select ARCH_REQUIRE_GPIOLIB
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	select CLKDEV_LOOKUP
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	select CLKSRC_MMIO
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	select CPU_ARM926T
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	select GENERIC_CLOCKEVENTS
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	help
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	  Support for Nuvoton (Winbond logic dept.) ARM9 processor,
	  At present, the w90x900 has been renamed nuc900, regarding
	  the ARM series product line, you can login the following
	  link address to know more.

	  <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
		ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
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config ARCH_LPC32XX
	bool "NXP LPC32XX"
	select ARCH_REQUIRE_GPIOLIB
	select ARM_AMBA
	select CLKDEV_LOOKUP
	select CLKSRC_MMIO
	select CPU_ARM926T
	select GENERIC_CLOCKEVENTS
	select HAVE_IDE
	select USE_OF
	help
	  Support for the NXP LPC32XX family of processors

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config ARCH_PXA
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	bool "PXA2xx/PXA3xx-based"
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	depends on MMU
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	select ARCH_MTD_XIP
	select ARCH_REQUIRE_GPIOLIB
	select ARM_CPU_SUSPEND if PM
	select AUTO_ZRELADDR
603
	select CLKDEV_LOOKUP
604
	select CLKSRC_MMIO
605
	select CLKSRC_OF
606
	select GENERIC_CLOCKEVENTS
607
	select GPIO_PXA
608
	select HAVE_IDE
609 610 611
	select MULTI_IRQ_HANDLER
	select PLAT_PXA
	select SPARSE_IRQ
612
	help
E
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613
	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
L
Linus Torvalds 已提交
614

615 616
config ARCH_MSM
	bool "Qualcomm MSM (non-multiplatform)"
P
Pavel Machek 已提交
617
	select ARCH_REQUIRE_GPIOLIB
618
	select COMMON_CLK
619
	select GENERIC_CLOCKEVENTS
620
	help
621 622 623 624 625
	  Support for Qualcomm MSM/QSD based systems.  This runs on the
	  apps processor of the MSM/QSD and depends on a shared memory
	  interface to the modem processor which runs the baseband
	  stack and controls some vital subsystems
	  (clock and power control, etc).
626

627
config ARCH_SHMOBILE_LEGACY
628
	bool "Renesas ARM SoCs (non-multiplatform)"
629
	select ARCH_SHMOBILE
630
	select ARM_PATCH_PHYS_VIRT if MMU
P
Paul Mundt 已提交
631
	select CLKDEV_LOOKUP
632
	select CPU_V7
633
	select GENERIC_CLOCKEVENTS
634
	select HAVE_ARM_SCU if SMP
635
	select HAVE_ARM_TWD if SMP
636
	select HAVE_MACH_CLKDEV
637
	select HAVE_SMP
638
	select MIGHT_HAVE_CACHE_L2X0
639
	select MULTI_IRQ_HANDLER
640
	select NO_IOPORT_MAP
641
	select PINCTRL
642
	select PM_GENERIC_DOMAINS if PM
643
	select SH_CLK_CPG
644
	select SPARSE_IRQ
645
	help
646 647 648
	  Support for Renesas ARM SoC platforms using a non-multiplatform
	  kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
	  and RZ families.
649

L
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650 651 652
config ARCH_RPC
	bool "RiscPC"
	select ARCH_ACORN
653
	select ARCH_MAY_HAVE_PC_FDC
654
	select ARCH_SPARSEMEM_ENABLE
655
	select ARCH_USES_GETTIMEOFFSET
A
Arnd Bergmann 已提交
656
	select CPU_SA110
657
	select FIQ
658
	select HAVE_IDE
659 660
	select HAVE_PATA_PLATFORM
	select ISA_DMA_API
661
	select NEED_MACH_IO_H
662
	select NEED_MACH_MEMORY_H
663
	select NO_IOPORT_MAP
664
	select VIRT_TO_BUS
L
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665 666 667 668 669 670
	help
	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
	  CD-ROM interface, serial and parallel port, and the floppy drive.

config ARCH_SA1100
	bool "SA1100-based"
671 672 673 674 675
	select ARCH_MTD_XIP
	select ARCH_REQUIRE_GPIOLIB
	select ARCH_SPARSEMEM_ENABLE
	select CLKDEV_LOOKUP
	select CLKSRC_MMIO
R
Russell King 已提交
676
	select CPU_FREQ
677
	select CPU_SA1100
678
	select GENERIC_CLOCKEVENTS
679
	select HAVE_IDE
680
	select IRQ_DOMAIN
681
	select ISA
682
	select MULTI_IRQ_HANDLER
683
	select NEED_MACH_MEMORY_H
684
	select SPARSE_IRQ
685 686
	help
	  Support for StrongARM 11x0 based boards.
L
Linus Torvalds 已提交
687

688 689
config ARCH_S3C24XX
	bool "Samsung S3C24XX SoCs"
690
	select ARCH_REQUIRE_GPIOLIB
691
	select ATAGS
692
	select CLKDEV_LOOKUP
693
	select CLKSRC_SAMSUNG_PWM
694
	select GENERIC_CLOCKEVENTS
695
	select GPIO_SAMSUNG
696
	select HAVE_S3C2410_I2C if I2C
697
	select HAVE_S3C2410_WATCHDOG if WATCHDOG
698
	select HAVE_S3C_RTC if RTC_CLASS
699
	select MULTI_IRQ_HANDLER
700
	select NEED_MACH_IO_H
701
	select SAMSUNG_ATAGS
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702
	help
703 704 705 706
	  Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
	  and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
	  (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
	  Samsung SMDK2410 development board (and derivatives).
707

B
Ben Dooks 已提交
708 709
config ARCH_S3C64XX
	bool "Samsung S3C64XX"
710
	select ARCH_REQUIRE_GPIOLIB
711
	select ARM_AMBA
712
	select ARM_VIC
713
	select ATAGS
714
	select CLKDEV_LOOKUP
715
	select CLKSRC_SAMSUNG_PWM
716
	select COMMON_CLK_SAMSUNG
717
	select CPU_V6K
718
	select GENERIC_CLOCKEVENTS
719
	select GPIO_SAMSUNG
720 721
	select HAVE_S3C2410_I2C if I2C
	select HAVE_S3C2410_WATCHDOG if WATCHDOG
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722
	select HAVE_TCM
723
	select NO_IOPORT_MAP
724
	select PLAT_SAMSUNG
725
	select PM_GENERIC_DOMAINS if PM
726 727
	select S3C_DEV_NAND
	select S3C_GPIO_TRACK
728
	select SAMSUNG_ATAGS
729
	select SAMSUNG_WAKEMASK
730
	select SAMSUNG_WDT_RESET
B
Ben Dooks 已提交
731 732 733
	help
	  Samsung S3C64XX series based systems

734 735
config ARCH_DAVINCI
	bool "TI DaVinci"
736
	select ARCH_HAS_HOLES_MEMORYMODEL
737
	select ARCH_REQUIRE_GPIOLIB
738
	select CLKDEV_LOOKUP
D
David Brownell 已提交
739
	select GENERIC_ALLOCATOR
740
	select GENERIC_CLOCKEVENTS
R
Russell King 已提交
741
	select GENERIC_IRQ_CHIP
742
	select HAVE_IDE
743
	select TI_PRIV_EDMA
744
	select USE_OF
745
	select ZONE_DMA
746 747 748
	help
	  Support for TI's DaVinci platform.

749 750
config ARCH_OMAP1
	bool "TI OMAP1"
A
Arnd Bergmann 已提交
751
	depends on MMU
752
	select ARCH_HAS_HOLES_MEMORYMODEL
753
	select ARCH_OMAP
754
	select ARCH_REQUIRE_GPIOLIB
755
	select CLKDEV_LOOKUP
756
	select CLKSRC_MMIO
757
	select GENERIC_CLOCKEVENTS
758 759 760 761 762
	select GENERIC_IRQ_CHIP
	select HAVE_IDE
	select IRQ_DOMAIN
	select NEED_MACH_IO_H if PCCARD
	select NEED_MACH_MEMORY_H
763
	help
764
	  Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
765

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766 767
endchoice

R
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768 769 770 771 772
menu "Multiple platform selection"
	depends on ARCH_MULTIPLATFORM

comment "CPU Core family selection"

A
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773 774 775 776 777 778
config ARCH_MULTI_V4
	bool "ARMv4 based platforms (FA526)"
	depends on !ARCH_MULTI_V6_V7
	select ARCH_MULTI_V4_V5
	select CPU_FA526

R
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config ARCH_MULTI_V4T
	bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
	depends on !ARCH_MULTI_V6_V7
782
	select ARCH_MULTI_V4_V5
783 784 785
	select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
		CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
		CPU_ARM925T || CPU_ARM940T)
R
Rob Herring 已提交
786 787 788 789

config ARCH_MULTI_V5
	bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
	depends on !ARCH_MULTI_V6_V7
790
	select ARCH_MULTI_V4_V5
791
	select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
792 793
		CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
		CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
R
Rob Herring 已提交
794 795 796 797 798

config ARCH_MULTI_V4_V5
	bool

config ARCH_MULTI_V6
799
	bool "ARMv6 based platforms (ARM11)"
R
Rob Herring 已提交
800
	select ARCH_MULTI_V6_V7
801
	select CPU_V6K
R
Rob Herring 已提交
802 803

config ARCH_MULTI_V7
804
	bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
R
Rob Herring 已提交
805 806
	default y
	select ARCH_MULTI_V6_V7
807
	select CPU_V7
808
	select HAVE_SMP
R
Rob Herring 已提交
809 810 811

config ARCH_MULTI_V6_V7
	bool
812
	select MIGHT_HAVE_CACHE_L2X0
R
Rob Herring 已提交
813 814 815 816 817 818 819

config ARCH_MULTI_CPU_AUTO
	def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
	select ARCH_MULTI_V5

endmenu

820 821
config ARCH_VIRT
	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
R
Rob Herring 已提交
822
	select ARM_AMBA
823 824
	select ARM_GIC
	select ARM_PSCI
R
Rob Herring 已提交
825
	select HAVE_ARM_ARCH_TIMER
826

827 828 829 830 831
#
# This is sorted alphabetically by mach-* pathname.  However, plat-*
# Kconfigs may be included either alphabetically (according to the
# plat- suffix) or along side the corresponding mach-* source.
#
832 833
source "arch/arm/mach-mvebu/Kconfig"

O
Oleksij Rempel 已提交
834 835
source "arch/arm/mach-asm9260/Kconfig"

836 837
source "arch/arm/mach-at91/Kconfig"

838 839
source "arch/arm/mach-axxia/Kconfig"

840 841
source "arch/arm/mach-bcm/Kconfig"

842 843
source "arch/arm/mach-berlin/Kconfig"

L
Linus Torvalds 已提交
844 845
source "arch/arm/mach-clps711x/Kconfig"

846 847
source "arch/arm/mach-cns3xxx/Kconfig"

848 849
source "arch/arm/mach-davinci/Kconfig"

850 851
source "arch/arm/mach-digicolor/Kconfig"

852 853
source "arch/arm/mach-dove/Kconfig"

854 855
source "arch/arm/mach-ep93xx/Kconfig"

L
Linus Torvalds 已提交
856 857
source "arch/arm/mach-footbridge/Kconfig"

858 859
source "arch/arm/mach-gemini/Kconfig"

R
Rob Herring 已提交
860 861
source "arch/arm/mach-highbank/Kconfig"

H
Haojian Zhuang 已提交
862 863
source "arch/arm/mach-hisi/Kconfig"

L
Linus Torvalds 已提交
864 865
source "arch/arm/mach-integrator/Kconfig"

866 867 868
source "arch/arm/mach-iop32x/Kconfig"

source "arch/arm/mach-iop33x/Kconfig"
L
Linus Torvalds 已提交
869

870 871
source "arch/arm/mach-iop13xx/Kconfig"

L
Linus Torvalds 已提交
872 873
source "arch/arm/mach-ixp4xx/Kconfig"

874 875
source "arch/arm/mach-keystone/Kconfig"

876 877
source "arch/arm/mach-ks8695/Kconfig"

878 879
source "arch/arm/mach-meson/Kconfig"

880 881
source "arch/arm/mach-msm/Kconfig"

882 883
source "arch/arm/mach-moxart/Kconfig"

884 885
source "arch/arm/mach-mv78xx0/Kconfig"

S
Shawn Guo 已提交
886
source "arch/arm/mach-imx/Kconfig"
L
Linus Torvalds 已提交
887

888 889
source "arch/arm/mach-mediatek/Kconfig"

890 891
source "arch/arm/mach-mxs/Kconfig"

892
source "arch/arm/mach-netx/Kconfig"
893

894 895
source "arch/arm/mach-nomadik/Kconfig"

D
Daniel Tang 已提交
896 897
source "arch/arm/mach-nspire/Kconfig"

898 899 900
source "arch/arm/plat-omap/Kconfig"

source "arch/arm/mach-omap1/Kconfig"
L
Linus Torvalds 已提交
901

902 903
source "arch/arm/mach-omap2/Kconfig"

904
source "arch/arm/mach-orion5x/Kconfig"
905

R
Rob Herring 已提交
906 907
source "arch/arm/mach-picoxcell/Kconfig"

908 909
source "arch/arm/mach-pxa/Kconfig"
source "arch/arm/plat-pxa/Kconfig"
910

911 912
source "arch/arm/mach-mmp/Kconfig"

913 914
source "arch/arm/mach-qcom/Kconfig"

915 916
source "arch/arm/mach-realview/Kconfig"

917 918
source "arch/arm/mach-rockchip/Kconfig"

919
source "arch/arm/mach-sa1100/Kconfig"
920

R
Rob Herring 已提交
921 922
source "arch/arm/mach-socfpga/Kconfig"

923
source "arch/arm/mach-spear/Kconfig"
924

925 926
source "arch/arm/mach-sti/Kconfig"

927
source "arch/arm/mach-s3c24xx/Kconfig"
L
Linus Torvalds 已提交
928

929
source "arch/arm/mach-s3c64xx/Kconfig"
B
Ben Dooks 已提交
930

931 932
source "arch/arm/mach-s5pv210/Kconfig"

933
source "arch/arm/mach-exynos/Kconfig"
934
source "arch/arm/plat-samsung/Kconfig"
935

936
source "arch/arm/mach-shmobile/Kconfig"
937

938 939
source "arch/arm/mach-sunxi/Kconfig"

940 941
source "arch/arm/mach-prima2/Kconfig"

942 943
source "arch/arm/mach-tegra/Kconfig"

944
source "arch/arm/mach-u300/Kconfig"
L
Linus Torvalds 已提交
945

946
source "arch/arm/mach-ux500/Kconfig"
L
Linus Torvalds 已提交
947 948 949

source "arch/arm/mach-versatile/Kconfig"

950
source "arch/arm/mach-vexpress/Kconfig"
951
source "arch/arm/plat-versatile/Kconfig"
952

953 954
source "arch/arm/mach-vt8500/Kconfig"

955 956
source "arch/arm/mach-w90x900/Kconfig"

957 958
source "arch/arm/mach-zynq/Kconfig"

L
Linus Torvalds 已提交
959 960 961 962
# Definitions to make life easier
config ARCH_ACORN
	bool

963 964
config PLAT_IOP
	bool
M
Mikael Pettersson 已提交
965
	select GENERIC_CLOCKEVENTS
966

L
Lennert Buytenhek 已提交
967 968
config PLAT_ORION
	bool
969
	select CLKSRC_MMIO
970
	select COMMON_CLK
R
Russell King 已提交
971
	select GENERIC_IRQ_CHIP
972
	select IRQ_DOMAIN
L
Lennert Buytenhek 已提交
973

974 975 976 977
config PLAT_ORION_LEGACY
	bool
	select PLAT_ORION

978 979 980
config PLAT_PXA
	bool

981 982 983
config PLAT_VERSATILE
	bool

984 985
config ARM_TIMER_SP804
	bool
986
	select CLKSRC_MMIO
987
	select CLKSRC_OF if OF
988

989 990
source "arch/arm/firmware/Kconfig"

L
Linus Torvalds 已提交
991 992
source arch/arm/mm/Kconfig

993
config IWMMXT
994 995 996
	bool "Enable iWMMXt support"
	depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
	default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
997 998 999 1000
	help
	  Enable support for iWMMXt context switching at run time if
	  running on a CPU that supports it.

1001 1002 1003 1004 1005
config MULTI_IRQ_HANDLER
	bool
	help
	  Allow each machine to specify it's own IRQ handler at run time.

1006 1007 1008 1009
if !MMU
source "arch/arm/Kconfig-nommu"
endif

1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
config PJ4B_ERRATA_4742
	bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
	depends on CPU_PJ4B && MACH_ARMADA_370
	default y
	help
	  When coming out of either a Wait for Interrupt (WFI) or a Wait for
	  Event (WFE) IDLE states, a specific timing sensitivity exists between
	  the retiring WFI/WFE instructions and the newly issued subsequent
	  instructions.  This sensitivity can result in a CPU hang scenario.
	  Workaround:
	  The software must insert either a Data Synchronization Barrier (DSB)
	  or Data Memory Barrier (DMB) command immediately after the WFI/WFE
	  instruction

1024 1025 1026 1027 1028 1029 1030 1031 1032
config ARM_ERRATA_326103
	bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
	depends on CPU_V6
	help
	  Executing a SWP instruction to read-only memory does not set bit 11
	  of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
	  treat the access as a read, preventing a COW from occurring and
	  causing the faulting task to livelock.

1033 1034
config ARM_ERRATA_411920
	bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1035
	depends on CPU_V6 || CPU_V6K
1036 1037 1038 1039 1040 1041
	help
	  Invalidation of the Instruction Cache operation can
	  fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
	  It does not affect the MPCore. This option enables the ARM Ltd.
	  recommended workaround.

1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
config ARM_ERRATA_430973
	bool "ARM errata: Stale prediction on replaced interworking branch"
	depends on CPU_V7
	help
	  This option enables the workaround for the 430973 Cortex-A8
	  (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
	  interworking branch is replaced with another code sequence at the
	  same virtual address, whether due to self-modifying code or virtual
	  to physical address re-mapping, Cortex-A8 does not recover from the
	  stale interworking branch prediction. This results in Cortex-A8
	  executing the new code sequence in the incorrect ARM or Thumb state.
	  The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
	  and also flushes the branch target cache at every context switch.
	  Note that setting specific bits in the ACTLR register may not be
	  available in non-secure mode.

1058 1059 1060
config ARM_ERRATA_458693
	bool "ARM errata: Processor deadlock when a false hazard is created"
	depends on CPU_V7
1061
	depends on !ARCH_MULTIPLATFORM
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
	help
	  This option enables the workaround for the 458693 Cortex-A8 (r2p0)
	  erratum. For very specific sequences of memory operations, it is
	  possible for a hazard condition intended for a cache line to instead
	  be incorrectly associated with a different cache line. This false
	  hazard might then cause a processor deadlock. The workaround enables
	  the L1 caching of the NEON accesses and disables the PLD instruction
	  in the ACTLR register. Note that setting specific bits in the ACTLR
	  register may not be available in non-secure mode.

1072 1073 1074
config ARM_ERRATA_460075
	bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
	depends on CPU_V7
1075
	depends on !ARCH_MULTIPLATFORM
1076 1077 1078 1079 1080 1081 1082 1083 1084
	help
	  This option enables the workaround for the 460075 Cortex-A8 (r2p0)
	  erratum. Any asynchronous access to the L2 cache may encounter a
	  situation in which recent store transactions to the L2 cache are lost
	  and overwritten with stale memory contents from external memory. The
	  workaround disables the write-allocate mode for the L2 cache via the
	  ACTLR register. Note that setting specific bits in the ACTLR register
	  may not be available in non-secure mode.

1085 1086 1087
config ARM_ERRATA_742230
	bool "ARM errata: DMB operation may be faulty"
	depends on CPU_V7 && SMP
1088
	depends on !ARCH_MULTIPLATFORM
1089 1090 1091 1092 1093 1094 1095 1096 1097
	help
	  This option enables the workaround for the 742230 Cortex-A9
	  (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
	  between two write operations may not ensure the correct visibility
	  ordering of the two writes. This workaround sets a specific bit in
	  the diagnostic register of the Cortex-A9 which causes the DMB
	  instruction to behave as a DSB, ensuring the correct behaviour of
	  the two writes.

1098 1099 1100
config ARM_ERRATA_742231
	bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
	depends on CPU_V7 && SMP
1101
	depends on !ARCH_MULTIPLATFORM
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	help
	  This option enables the workaround for the 742231 Cortex-A9
	  (r2p0..r2p2) erratum. Under certain conditions, specific to the
	  Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
	  accessing some data located in the same cache line, may get corrupted
	  data due to bad handling of the address hazard when the line gets
	  replaced from one of the CPUs at the same time as another CPU is
	  accessing it. This workaround sets specific bits in the diagnostic
	  register of the Cortex-A9 which reduces the linefill issuing
	  capabilities of the processor.

1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
config ARM_ERRATA_643719
	bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
	depends on CPU_V7 && SMP
	help
	  This option enables the workaround for the 643719 Cortex-A9 (prior to
	  r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
	  register returns zero when it should return one. The workaround
	  corrects this value, ensuring cache maintenance operations which use
	  it behave as intended and avoiding data corruption.

1123 1124
config ARM_ERRATA_720789
	bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1125
	depends on CPU_V7
1126 1127 1128 1129 1130 1131 1132 1133
	help
	  This option enables the workaround for the 720789 Cortex-A9 (prior to
	  r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
	  broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
	  As a consequence of this erratum, some TLB entries which should be
	  invalidated are not, resulting in an incoherency in the system page
	  tables. The workaround changes the TLB flushing routines to invalidate
	  entries regardless of the ASID.
1134 1135 1136 1137

config ARM_ERRATA_743622
	bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
	depends on CPU_V7
1138
	depends on !ARCH_MULTIPLATFORM
1139 1140
	help
	  This option enables the workaround for the 743622 Cortex-A9
1141
	  (r2p*) erratum. Under very rare conditions, a faulty
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	  optimisation in the Cortex-A9 Store Buffer may lead to data
	  corruption. This workaround sets a specific bit in the diagnostic
	  register of the Cortex-A9 which disables the Store Buffer
	  optimisation, preventing the defect from occurring. This has no
	  visible impact on the overall performance or power consumption of the
	  processor.

1149 1150
config ARM_ERRATA_751472
	bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1151
	depends on CPU_V7
1152
	depends on !ARCH_MULTIPLATFORM
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	help
	  This option enables the workaround for the 751472 Cortex-A9 (prior
	  to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
	  completion of a following broadcasted operation if the second
	  operation is received by a CPU before the ICIALLUIS has completed,
	  potentially leading to corrupted entries in the cache or TLB.

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config ARM_ERRATA_754322
	bool "ARM errata: possible faulty MMU translations following an ASID switch"
	depends on CPU_V7
	help
	  This option enables the workaround for the 754322 Cortex-A9 (r2p*,
	  r3p*) erratum. A speculative memory access may cause a page table walk
	  which starts prior to an ASID switch but completes afterwards. This
	  can populate the micro-TLB with a stale entry which may be hit with
	  the new ASID. This workaround places two dsb instructions in the mm
	  switching code so that no page table walks can cross the ASID switch.

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config ARM_ERRATA_754327
	bool "ARM errata: no automatic Store Buffer drain"
	depends on CPU_V7 && SMP
	help
	  This option enables the workaround for the 754327 Cortex-A9 (prior to
	  r2p0) erratum. The Store Buffer does not have any automatic draining
	  mechanism and therefore a livelock may occur if an external agent
	  continuously polls a memory location waiting to observe an update.
	  This workaround defines cpu_relax() as smp_mb(), preventing correctly
	  written polling loops from denying visibility of updates to memory.

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config ARM_ERRATA_364296
	bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1184
	depends on CPU_V6
1185 1186 1187 1188 1189 1190 1191 1192 1193
	help
	  This options enables the workaround for the 364296 ARM1136
	  r0p2 erratum (possible cache data corruption with
	  hit-under-miss enabled). It sets the undocumented bit 31 in
	  the auxiliary control register and the FI bit in the control
	  register, thus disabling hit-under-miss without putting the
	  processor into full low interrupt latency mode. ARM11MPCore
	  is not affected.

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config ARM_ERRATA_764369
	bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
	depends on CPU_V7 && SMP
	help
	  This option enables the workaround for erratum 764369
	  affecting Cortex-A9 MPCore with two or more processors (all
	  current revisions). Under certain timing circumstances, a data
	  cache line maintenance operation by MVA targeting an Inner
	  Shareable memory region may fail to proceed up to either the
	  Point of Coherency or to the Point of Unification of the
	  system. This workaround adds a DSB instruction before the
	  relevant cache maintenance functions and sets a specific bit
	  in the diagnostic control register of the SCU.

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config ARM_ERRATA_775420
       bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
       depends on CPU_V7
       help
	 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
	 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
	 operation aborts with MMU exception, it might cause the processor
	 to deadlock. This workaround puts DSB before executing ISB if
	 an abort may occur on cache maintenance.

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config ARM_ERRATA_798181
	bool "ARM errata: TLBI/DSB failure on Cortex-A15"
	depends on CPU_V7 && SMP
	help
	  On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
	  adequately shooting down all use of the old entries. This
	  option enables the Linux kernel workaround for this erratum
	  which sends an IPI to the CPUs that are running the same ASID
	  as the one being invalidated.

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config ARM_ERRATA_773022
	bool "ARM errata: incorrect instructions may be executed from loop buffer"
	depends on CPU_V7
	help
	  This option enables the workaround for the 773022 Cortex-A15
	  (up to r0p4) erratum. In certain rare sequences of code, the
	  loop buffer may deliver incorrect instructions. This
	  workaround disables the loop buffer to avoid the erratum.

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endmenu

source "arch/arm/common/Kconfig"

menu "Bus support"

config ISA
	bool
	help
	  Find out whether you have ISA slots on your motherboard.  ISA is the
	  name of a bus system, i.e. the way the CPU talks to the other stuff
	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
	  newer boards don't support it.  If you have ISA, say Y, otherwise N.

1252
# Select ISA DMA controller support
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config ISA_DMA
	bool
1255
	select ISA_DMA_API
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1257
# Select ISA DMA interface
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config ISA_DMA_API
	bool

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config PCI
1262
	bool "PCI support" if MIGHT_HAVE_PCI
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	help
	  Find out whether you have a PCI motherboard. PCI is the name of a
	  bus system, i.e. the way the CPU talks to the other stuff inside
	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
	  VESA. If you have PCI, say Y, otherwise N.

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config PCI_DOMAINS
	bool
	depends on PCI

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config PCI_DOMAINS_GENERIC
	def_bool PCI_DOMAINS

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config PCI_NANOENGINE
	bool "BSE nanoEngine PCI support"
	depends on SA1100_NANOENGINE
	help
	  Enable PCI on the BSE nanoEngine board.

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config PCI_SYSCALL
	def_bool PCI

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config PCI_HOST_ITE8152
	bool
	depends on PCI && MACH_ARMCORE
	default y
	select DMABOUNCE

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source "drivers/pci/Kconfig"
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source "drivers/pci/pcie/Kconfig"
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source "drivers/pcmcia/Kconfig"

endmenu

menu "Kernel Features"

1300 1301 1302 1303 1304 1305 1306 1307 1308
config HAVE_SMP
	bool
	help
	  This option should be selected by machines which have an SMP-
	  capable CPU.

	  The only effect of this option is to make the SMP-related
	  options available to the user for configuration.

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config SMP
1310
	bool "Symmetric Multi-Processing"
1311
	depends on CPU_V6K || CPU_V7
1312
	depends on GENERIC_CLOCKEVENTS
1313
	depends on HAVE_SMP
1314
	depends on MMU || ARM_MPU
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	help
	  This enables support for systems with more than one CPU. If you have
1317 1318
	  a system with only one CPU, say N. If you have a system with more
	  than one CPU, say Y.
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1320
	  If you say N here, the kernel will run on uni- and multiprocessor
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	  machines, but will use only one CPU of a multiprocessor machine. If
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	  you say Y here, the kernel will run on many, but not all,
	  uniprocessor machines. On a uniprocessor machine, the kernel
	  will run faster if you say N here.
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	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
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	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1328
	  <http://tldp.org/HOWTO/SMP-HOWTO.html>.
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	  If you don't know what to do here, say N.

1332 1333
config SMP_ON_UP
	bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1334
	depends on SMP && !XIP_KERNEL && MMU
1335 1336 1337 1338 1339 1340 1341 1342 1343
	default y
	help
	  SMP kernels contain instructions which fail on non-SMP processors.
	  Enabling this option allows the kernel to modify itself to make
	  these instructions safe.  Disabling it allows about 1K of space
	  savings.

	  If you don't know what to do here, say Y.

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config ARM_CPU_TOPOLOGY
	bool "Support cpu topology definition"
	depends on SMP && CPU_V7
	default y
	help
	  Support ARM cpu topology definition. The MPIDR register defines
	  affinity between processors which is then used to describe the cpu
	  topology of an ARM System.

config SCHED_MC
	bool "Multi-core scheduler support"
	depends on ARM_CPU_TOPOLOGY
	help
	  Multi-core scheduler support improves the CPU scheduler's decision
	  making when dealing with multi-core CPU chips at a cost of slightly
	  increased overhead in some places. If unsure say N here.

config SCHED_SMT
	bool "SMT scheduler support"
	depends on ARM_CPU_TOPOLOGY
	help
	  Improves the CPU scheduler's decision making when dealing with
	  MultiThreading at a cost of slightly increased overhead in some
	  places. If unsure say N here.

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config HAVE_ARM_SCU
	bool
	help
	  This option enables support for the ARM system coherency unit

1374
config HAVE_ARM_ARCH_TIMER
1375 1376
	bool "Architected timer support"
	depends on CPU_V7
1377
	select ARM_ARCH_TIMER
1378
	select GENERIC_CLOCKEVENTS
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	help
	  This option enables support for the ARM architected timer

1382 1383 1384
config HAVE_ARM_TWD
	bool
	depends on SMP
1385
	select CLKSRC_OF if OF
1386 1387 1388
	help
	  This options enables support for the ARM timer and watchdog unit

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config MCPM
	bool "Multi-Cluster Power Management"
	depends on CPU_V7 && SMP
	help
	  This option provides the common power management infrastructure
	  for (multi-)cluster based systems, such as big.LITTLE based
	  systems.

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config MCPM_QUAD_CLUSTER
	bool
	depends on MCPM
	help
	  To avoid wasting resources unnecessarily, MCPM only supports up
	  to 2 clusters by default.
	  Platforms with 3 or 4 clusters that use MCPM must select this
	  option to allow the additional clusters to be managed.

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config BIG_LITTLE
	bool "big.LITTLE support (Experimental)"
	depends on CPU_V7 && SMP
	select MCPM
	help
	  This option enables support selections for the big.LITTLE
	  system architecture.

config BL_SWITCHER
	bool "big.LITTLE switcher support"
	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
	select ARM_CPU_SUSPEND
1418
	select CPU_PM
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	help
	  The big.LITTLE "switcher" provides the core functionality to
	  transparently handle transition between a cluster of A15's
	  and a cluster of A7's in a big.LITTLE system.

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config BL_SWITCHER_DUMMY_IF
	tristate "Simple big.LITTLE switcher user interface"
	depends on BL_SWITCHER && DEBUG_KERNEL
	help
	  This is a simple and dummy char dev interface to control
	  the big.LITTLE switcher core code.  It is meant for
	  debugging purposes only.

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choice
	prompt "Memory split"
1434
	depends on MMU
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	default VMSPLIT_3G
	help
	  Select the desired split between kernel and user memory.

	  If you are not absolutely sure what you are doing, leave this
	  option alone!

	config VMSPLIT_3G
		bool "3G/1G user/kernel split"
	config VMSPLIT_2G
		bool "2G/2G user/kernel split"
	config VMSPLIT_1G
		bool "1G/3G user/kernel split"
endchoice

config PAGE_OFFSET
	hex
1452
	default PHYS_OFFSET if !MMU
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	default 0x40000000 if VMSPLIT_1G
	default 0x80000000 if VMSPLIT_2G
	default 0xC0000000

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config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "4"

1463
config HOTPLUG_CPU
1464
	bool "Support for hot-pluggable CPUs"
1465
	depends on SMP
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	help
	  Say Y here to experiment with turning CPUs off and on.  CPUs
	  can be controlled through /sys/devices/system/cpu.

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config ARM_PSCI
	bool "Support for the ARM Power State Coordination Interface (PSCI)"
	depends on CPU_V7
	help
	  Say Y here if you want Linux to communicate with system firmware
	  implementing the PSCI specification for CPU-centric power
	  management operations described in ARM document number ARM DEN
	  0022A ("Power State Coordination Interface System Software on
	  ARM processors").

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# The GPIO number here must be sorted by descending number. In case of
# a multiplatform kernel, we just want the highest value required by the
# selected platforms.
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config ARCH_NR_GPIO
	int
1485
	default 1024 if ARCH_SHMOBILE || ARCH_TEGRA || ARCH_ZYNQ
1486 1487
	default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
		SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1488
	default 416 if ARCH_SUNXI
1489
	default 392 if ARCH_U8500
1490
	default 352 if ARCH_VT8500
1491
	default 288 if ARCH_ROCKCHIP
1492
	default 264 if MACH_H4700
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	default 0
	help
	  Maximum number of GPIOs in the system.

	  If unsure, leave the default value.

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source kernel/Kconfig.preempt
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config HZ_FIXED
1502
	int
1503
	default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
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		ARCH_S5PV210 || ARCH_EXYNOS4
1505
	default 128 if SOC_AT91RM9200
1506
	default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
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	default 0
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choice
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	depends on HZ_FIXED = 0
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	prompt "Timer frequency"

config HZ_100
	bool "100 Hz"

config HZ_200
	bool "200 Hz"

config HZ_250
	bool "250 Hz"

config HZ_300
	bool "300 Hz"

config HZ_500
	bool "500 Hz"

config HZ_1000
	bool "1000 Hz"

endchoice

config HZ
	int
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	default HZ_FIXED if HZ_FIXED != 0
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	default 100 if HZ_100
	default 200 if HZ_200
	default 250 if HZ_250
	default 300 if HZ_300
	default 500 if HZ_500
	default 1000

config SCHED_HRTICK
	def_bool HIGH_RES_TIMERS
1545

1546
config THUMB2_KERNEL
1547
	bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1548
	depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1549
	default y if CPU_THUMBONLY
1550 1551
	select AEABI
	select ARM_ASM_UNIFIED
1552
	select ARM_UNWIND
1553 1554 1555 1556 1557 1558 1559
	help
	  By enabling this option, the kernel will be compiled in
	  Thumb-2 mode. A compiler/assembler that understand the unified
	  ARM-Thumb syntax is needed.

	  If unsure, say N.

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config THUMB2_AVOID_R_ARM_THM_JUMP11
	bool "Work around buggy Thumb-2 short branch relocations in gas"
	depends on THUMB2_KERNEL && MODULES
	default y
	help
	  Various binutils versions can resolve Thumb-2 branches to
	  locally-defined, preemptible global symbols as short-range "b.n"
	  branch instructions.

	  This is a problem, because there's no guarantee the final
	  destination of the symbol, or any candidate locations for a
	  trampoline, are within range of the branch.  For this reason, the
	  kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
	  relocation in modules at all, and it makes little sense to add
	  support.

	  The symptom is that the kernel fails with an "unsupported
	  relocation" error when loading some modules.

	  Until fixed tools are available, passing
	  -fno-optimize-sibling-calls to gcc should prevent gcc generating
	  code which hits this problem, at the cost of a bit of extra runtime
	  stack usage in some cases.

	  The problem is described in more detail at:
	      https://bugs.launchpad.net/binutils-linaro/+bug/725126

	  Only Thumb-2 kernels are affected.

	  Unless you are sure your tools don't have this problem, say Y.

1591 1592 1593
config ARM_ASM_UNIFIED
	bool

1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
config AEABI
	bool "Use the ARM EABI to compile the kernel"
	help
	  This option allows for the kernel to be compiled using the latest
	  ARM ABI (aka EABI).  This is only useful if you are using a user
	  space environment that is also compiled with EABI.

	  Since there are major incompatibilities between the legacy ABI and
	  EABI, especially with regard to structure member alignment, this
	  option also changes the kernel syscall calling convention to
	  disambiguate both ABIs and allow for backward compatibility support
	  (selected with CONFIG_OABI_COMPAT).

	  To use this you need GCC version 4.0.0 or later.

1609
config OABI_COMPAT
1610
	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1611
	depends on AEABI && !THUMB2_KERNEL
1612 1613 1614 1615 1616 1617 1618
	help
	  This option preserves the old syscall interface along with the
	  new (ARM EABI) one. It also provides a compatibility layer to
	  intercept syscalls that have structure arguments which layout
	  in memory differs between the legacy ABI and the new ARM EABI
	  (only for non "thumb" binaries). This option adds a tiny
	  overhead to all syscalls and produces a slightly larger kernel.
1619 1620 1621 1622 1623

	  The seccomp filter system will not be available when this is
	  selected, since there is no way yet to sensibly distinguish
	  between calling conventions during filtering.

1624 1625 1626 1627
	  If you know you'll be using only pure EABI user space then you
	  can say N here. If this option is not selected and you attempt
	  to execute a legacy ABI binary then the result will be
	  UNPREDICTABLE (in fact it can be predicted that it won't work
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	  at all). If in doubt say N.
1629

1630
config ARCH_HAS_HOLES_MEMORYMODEL
1631 1632
	bool

1633 1634 1635
config ARCH_SPARSEMEM_ENABLE
	bool

1636 1637 1638
config ARCH_SPARSEMEM_DEFAULT
	def_bool ARCH_SPARSEMEM_ENABLE

1639
config ARCH_SELECT_MEMORY_MODEL
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	def_bool ARCH_SPARSEMEM_ENABLE
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1642 1643 1644
config HAVE_ARCH_PFN_VALID
	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM

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config HAVE_GENERIC_RCU_GUP
	def_bool y
	depends on ARM_LPAE

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config HIGHMEM
1650 1651
	bool "High Memory Support"
	depends on MMU
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	help
	  The address space of ARM processors is only 4 Gigabytes large
	  and it has to accommodate user address space, kernel address
	  space as well as some memory mapped IO. That means that, if you
	  have a large amount of physical memory and/or IO, not all of the
	  memory can be "permanently mapped" by the kernel. The physical
	  memory that is not permanently mapped is called "high memory".

	  Depending on the selected kernel/user memory split, minimum
	  vmalloc space and actual amount of RAM, you may not need this
	  option which should result in a slightly faster kernel.

	  If unsure, say n.

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config HIGHPTE
	bool "Allocate 2nd-level pagetables from highmem"
	depends on HIGHMEM

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config HW_PERF_EVENTS
	bool "Enable hardware performance counter support for perf events"
1672
	depends on PERF_EVENTS
1673 1674 1675 1676 1677
	default y
	help
	  Enable hardware performance counter support for perf events. If
	  disabled, perf events will use software events only.

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config SYS_SUPPORTS_HUGETLBFS
       def_bool y
       depends on ARM_LPAE

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config HAVE_ARCH_TRANSPARENT_HUGEPAGE
       def_bool y
       depends on ARM_LPAE

1686 1687 1688
config ARCH_WANT_GENERAL_HUGETLB
	def_bool y

1689 1690
source "mm/Kconfig"

1691
config FORCE_MAX_ZONEORDER
1692 1693
	int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
	range 11 64 if ARCH_SHMOBILE_LEGACY
1694
	default "12" if SOC_AM33XX
1695
	default "9" if SA1111 || ARCH_EFM32
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
	default "11"
	help
	  The kernel memory allocator divides physically contiguous memory
	  blocks into "zones", where each zone is a power of two number of
	  pages.  This option selects the largest power of two that the kernel
	  keeps in the memory allocator.  If you need to allocate very large
	  blocks of physically contiguous memory, then you may need to
	  increase this value.

	  This config option is actually maximum order plus one. For example,
	  a value of 11 means that the largest free memory block is 2^10 pages.

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config ALIGNMENT_TRAP
	bool
1710
	depends on CPU_CP15_MMU
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	default y if !ARCH_EBSA110
1712
	select HAVE_PROC_CPU if PROC_FS
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	help
1714
	  ARM processors cannot fetch/store information which is not
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	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
	  address divisible by 4. On 32-bit ARM processors, these non-aligned
	  fetch/store instructions will be emulated in software if you say
	  here, which has a severe performance impact. This is necessary for
	  correct operation of some network protocols. With an IP-only
	  configuration it is safe to say N, otherwise say Y.

1722
config UACCESS_WITH_MEMCPY
1723 1724
	bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
	depends on MMU
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	default y if CPU_FEROCEON
	help
	  Implement faster copy_to_user and clear_user methods for CPU
	  cores where a 8-word STM instruction give significantly higher
	  memory write throughput than a sequence of individual 32bit stores.

	  A possible side effect is a slight increase in scheduling latency
	  between threads sharing the same address space if they invoke
	  such copy operations with large buffers.

	  However, if the CPU data cache is using a write-allocate mode,
	  this option is unlikely to provide any performance gain.

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config SECCOMP
	bool
	prompt "Enable seccomp to safely compute untrusted bytecode"
	---help---
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.

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config SWIOTLB
	def_bool y

config IOMMU_HELPER
	def_bool SWIOTLB

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config XEN_DOM0
	def_bool y
	depends on XEN

config XEN
1763
	bool "Xen guest support on ARM"
1764
	depends on ARM && AEABI && OF
1765
	depends on CPU_V7 && !CPU_V6
1766
	depends on !GENERIC_ATOMIC64
1767
	depends on MMU
1768
	select ARCH_DMA_ADDR_T_64BIT
1769
	select ARM_PSCI
1770
	select SWIOTLB_XEN
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	help
	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.

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endmenu

menu "Boot options"

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config USE_OF
	bool "Flattened Device Tree support"
1780
	select IRQ_DOMAIN
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	select OF
	select OF_EARLY_FLATTREE
1783
	select OF_RESERVED_MEM
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	help
	  Include support for flattened device tree machine descriptions.

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config ATAGS
	bool "Support for the traditional ATAGS boot data passing" if USE_OF
	default y
	help
	  This is the traditional way of passing data to the kernel at boot
	  time. If you are solely relying on the flattened device tree (or
	  the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
	  to remove ATAGS support from your kernel binary.  If unsure,
	  leave this to y.

config DEPRECATED_PARAM_STRUCT
	bool "Provide old way to pass kernel parameters"
	depends on ATAGS
	help
	  This was deprecated in 2001 and announced to live on for 5 years.
	  Some old boot loaders still use this way.

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# Compressed boot loader in ROM.  Yes, we really want to ask about
# TEXT and BSS so we preserve their values in the config files.
config ZBOOT_ROM_TEXT
	hex "Compressed ROM boot loader base address"
	default "0"
	help
	  The physical address at which the ROM-able zImage is to be
	  placed in the target.  Platforms which normally make use of
	  ROM-able zImage formats normally set this to a suitable
	  value in their defconfig file.

	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM_BSS
	hex "Compressed ROM boot loader BSS address"
	default "0"
	help
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	  The base address of an area of read/write memory in the target
	  for the ROM-able zImage which must be available while the
	  decompressor is running. It must be large enough to hold the
	  entire decompressed kernel plus an additional 128 KiB.
	  Platforms which normally make use of ROM-able zImage formats
	  normally set this to a suitable value in their defconfig file.
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	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM
	bool "Compressed boot loader in ROM/flash"
	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1833
	depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
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	help
	  Say Y here if you intend to execute your compressed kernel image
	  (zImage) directly from ROM or flash.  If unsure, say N.

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choice
	prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1840
	depends on ZBOOT_ROM && ARCH_SH7372
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	default ZBOOT_ROM_NONE
	help
	  Include experimental SD/MMC loading code in the ROM-able zImage.
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	  With this enabled it is possible to write the ROM-able zImage
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	  kernel image to an MMC or SD card and boot the kernel straight
	  from the reset vector. At reset the processor Mask ROM will load
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	  the first part of the ROM-able zImage which in turn loads the
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	  rest the kernel image to RAM.

config ZBOOT_ROM_NONE
	bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
	help
	  Do not load image from SD or MMC

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config ZBOOT_ROM_MMCIF
	bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
	help
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	  Load image from MMCIF hardware block.

config ZBOOT_ROM_SH_MOBILE_SDHI
	bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
	help
	  Load image from SDHI hardware block

endchoice
1866

1867 1868
config ARM_APPENDED_DTB
	bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1869
	depends on OF
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	help
	  With this option, the boot code will look for a device tree binary
	  (DTB) appended to zImage
	  (e.g. cat zImage <filename>.dtb > zImage_w_dtb).

	  This is meant as a backward compatibility convenience for those
	  systems with a bootloader that can't be upgraded to accommodate
	  the documented boot protocol using a device tree.

	  Beware that there is very little in terms of protection against
	  this option being confused by leftover garbage in memory that might
	  look like a DTB header after a reboot if no actual DTB is appended
	  to zImage.  Do not leave this option active in a production kernel
	  if you don't intend to always append a DTB.  Proper passing of the
	  location into r2 of a bootloader provided DTB is always preferable
	  to this option.

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config ARM_ATAG_DTB_COMPAT
	bool "Supplement the appended DTB with traditional ATAG information"
	depends on ARM_APPENDED_DTB
	help
	  Some old bootloaders can't be updated to a DTB capable one, yet
	  they provide ATAGs with memory configuration, the ramdisk address,
	  the kernel cmdline string, etc.  Such information is dynamically
	  provided by the bootloader and can't always be stored in a static
	  DTB.  To allow a device tree enabled kernel to be used with such
	  bootloaders, this option allows zImage to extract the information
	  from the ATAG list and store it at run time into the appended DTB.

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choice
	prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
	default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER

config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
	bool "Use bootloader kernel arguments if available"
	help
	  Uses the command-line options passed by the boot loader instead of
	  the device tree bootargs property. If the boot loader doesn't provide
	  any, the device tree bootargs property will be used.

config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
	bool "Extend with bootloader kernel arguments"
	help
	  The command-line arguments provided by the boot loader will be
	  appended to the the device tree bootargs property.

endchoice

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config CMDLINE
	string "Default kernel command string"
	default ""
	help
	  On some architectures (EBSA110 and CATS), there is currently no way
	  for the boot loader to pass arguments to the kernel. For these
	  architectures, you should supply some command-line options at build
	  time by entering them here. As a minimum, you should specify the
	  memory size and the root device (e.g., mem=64M root=/dev/nfs).

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choice
	prompt "Kernel command line type" if CMDLINE != ""
	default CMDLINE_FROM_BOOTLOADER
1931
	depends on ATAGS
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config CMDLINE_FROM_BOOTLOADER
	bool "Use bootloader kernel arguments if available"
	help
	  Uses the command-line options passed by the boot loader. If
	  the boot loader doesn't provide any, the default kernel command
	  string provided in CMDLINE will be used.

config CMDLINE_EXTEND
	bool "Extend bootloader kernel arguments"
	help
	  The command-line arguments provided by the boot loader will be
	  appended to the default kernel command string.

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config CMDLINE_FORCE
	bool "Always use the default kernel command string"
	help
	  Always use the default kernel command string, even if the boot
	  loader passes other arguments to the kernel.
	  This is useful if you cannot or don't want to change the
	  command-line options your boot loader passes to the kernel.
1953
endchoice
1954

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config XIP_KERNEL
	bool "Kernel Execute-In-Place from ROM"
1957
	depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
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	help
	  Execute-In-Place allows the kernel to run from non-volatile storage
	  directly addressable by the CPU, such as NOR flash. This saves RAM
	  space since the text section of the kernel is not loaded from flash
	  to RAM.  Read-write sections, such as the data section and stack,
	  are still copied to RAM.  The XIP kernel is not compressed since
	  it has to run directly from flash, so it will take more space to
	  store it.  The flash address used to link the kernel object files,
	  and for storing it, is configuration dependent. Therefore, if you
	  say Y here, you must know the proper physical address where to
	  store the kernel image depending on your own flash memory usage.

	  Also note that the make target becomes "make xipImage" rather than
	  "make zImage" or "make Image".  The final kernel binary to put in
	  ROM memory will be arch/arm/boot/xipImage.

	  If unsure, say N.

config XIP_PHYS_ADDR
	hex "XIP Kernel Physical Location"
	depends on XIP_KERNEL
	default "0x00080000"
	help
	  This is the physical address in your flash memory the kernel will
	  be linked for and stored to.  This address is dependent on your
	  own flash usage.

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config KEXEC
	bool "Kexec system call (EXPERIMENTAL)"
1987
	depends on (!SMP || PM_SLEEP_SMP)
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	help
	  kexec is a system call that implements the ability to shutdown your
	  current kernel, and to start another kernel.  It is like a reboot
M
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1991
	  but it is independent of the system firmware.   And like a reboot
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	  you can start any kernel with it, not just Linux.

	  It is an ongoing process to be certain the hardware in a machine
	  is properly shutdown, so do not be surprised if this code does not
1996
	  initially work for you.
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1998 1999
config ATAGS_PROC
	bool "Export atags in procfs"
2000
	depends on ATAGS && KEXEC
2001
	default y
2002 2003 2004 2005
	help
	  Should the atags used to boot the kernel be exported in an "atags"
	  file in procfs. Useful with kexec.

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
config CRASH_DUMP
	bool "Build kdump crash kernel (EXPERIMENTAL)"
	help
	  Generate crash dump after being started by kexec. This should
	  be normally only set in special crash dump kernels which are
	  loaded in the main kernel with kexec-tools into a specially
	  reserved region and then later executed after a crash by
	  kdump/kexec. The crash dump kernel must be compiled to a
	  memory address not used by the main kernel

	  For more details see Documentation/kdump/kdump.txt

2018 2019 2020 2021 2022 2023 2024 2025 2026
config AUTO_ZRELADDR
	bool "Auto calculation of the decompressed kernel image address"
	help
	  ZRELADDR is the physical address where the decompressed kernel
	  image will be placed. If AUTO_ZRELADDR is selected, the address
	  will be determined at run-time by masking the current IP with
	  0xf8000000. This assumes the zImage being placed in the first 128MB
	  from start of memory.

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endmenu

2029
menu "CPU Power Management"
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source "drivers/cpufreq/Kconfig"

2033 2034 2035 2036
source "drivers/cpuidle/Kconfig"

endmenu

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menu "Floating point emulation"

comment "At least one emulation must be selected"

config FPE_NWFPE
	bool "NWFPE math emulation"
2043
	depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
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	---help---
	  Say Y to include the NWFPE floating point emulator in the kernel.
	  This is necessary to run most binaries. Linux does not currently
	  support floating point hardware so you need to say Y here even if
	  your machine has an FPA or floating point co-processor podule.

	  You may say N here if you are going to load the Acorn FPEmulator
	  early in the bootup.

config FPE_NWFPE_XP
	bool "Support extended precision"
2055
	depends on FPE_NWFPE
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	help
	  Say Y to include 80-bit support in the kernel floating-point
	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
	  Note that gcc does not generate 80-bit operations by default,
	  so in most cases this option only enlarges the size of the
	  floating point emulator without any good reason.

	  You almost surely want to say N here.

config FPE_FASTFPE
	bool "FastFPE math emulation (EXPERIMENTAL)"
2067
	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
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	---help---
	  Say Y here to include the FAST floating point emulator in the kernel.
	  This is an experimental much faster emulator which now also has full
	  precision for the mantissa.  It does not support any exceptions.
	  It is very simple, and approximately 3-6 times faster than NWFPE.

	  It should be sufficient for most programs.  It may be not suitable
	  for scientific calculations, but you have to check this for yourself.
	  If you do not feel you need a faster FP emulation you should better
	  choose NWFPE.

config VFP
	bool "VFP-format floating point maths"
2081
	depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
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	help
	  Say Y to include VFP support code in the kernel. This is needed
	  if your hardware includes a VFP unit.

	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
	  release notes and additional status information.

	  Say N if your target does not have VFP hardware.

2091 2092 2093 2094 2095
config VFPv3
	bool
	depends on VFP
	default y if CPU_V7

2096 2097 2098 2099 2100 2101 2102
config NEON
	bool "Advanced SIMD (NEON) Extension support"
	depends on VFPv3 && CPU_V7
	help
	  Say Y to include support code for NEON, the ARMv7 Advanced SIMD
	  Extension.

2103 2104
config KERNEL_MODE_NEON
	bool "Support for NEON in kernel mode"
2105
	depends on NEON && AEABI
2106 2107 2108
	help
	  Say Y to include support for NEON in kernel mode.

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endmenu

menu "Userspace binary formats"

source "fs/Kconfig.binfmt"

config ARTHUR
	tristate "RISC OS personality"
2117
	depends on !AEABI
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	help
	  Say Y here to include the kernel code necessary if you want to run
	  Acorn RISC OS/Arthur binaries under Linux. This code is still very
	  experimental; if this sounds frightening, say N and sleep in peace.
	  You can also say M here to compile this support as a module (which
	  will be called arthur).

endmenu

menu "Power management options"

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source "kernel/power/Kconfig"
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config ARCH_SUSPEND_POSSIBLE
2132
	depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2133
		CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
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	def_bool y

2136 2137 2138
config ARM_CPU_SUSPEND
	def_bool PM_SLEEP

2139 2140 2141 2142 2143
config ARCH_HIBERNATION_POSSIBLE
	bool
	depends on MMU
	default y if ARCH_SUSPEND_POSSIBLE

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endmenu

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source "net/Kconfig"

2148
source "drivers/Kconfig"
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source "fs/Kconfig"

source "arch/arm/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"
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source "arch/arm/kvm/Kconfig"