comment "Processor Type"
config CPU_32
bool
default y
# Select CPU types depending on the architecture selected. This selects
# which CPUs we support in the kernel image, and the compiler instruction
# optimiser behaviour.
# ARM610
config CPU_ARM610
bool "Support ARM610 processor"
depends on ARCH_RPC
select CPU_32v3
select CPU_CACHE_V3
select CPU_CACHE_VIVT
select CPU_COPY_V3
select CPU_TLB_V3
help
The ARM610 is the successor to the ARM3 processor
and was produced by VLSI Technology Inc.
Say Y if you want support for the ARM610 processor.
Otherwise, say N.
# ARM710
config CPU_ARM710
bool "Support ARM710 processor" if !ARCH_CLPS7500 && ARCH_RPC
default y if ARCH_CLPS7500
select CPU_32v3
select CPU_CACHE_V3
select CPU_CACHE_VIVT
select CPU_COPY_V3
select CPU_TLB_V3
help
A 32-bit RISC microprocessor based on the ARM7 processor core
designed by Advanced RISC Machines Ltd. The ARM710 is the
successor to the ARM610 processor. It was released in
July 1994 by VLSI Technology Inc.
Say Y if you want support for the ARM710 processor.
Otherwise, say N.
# ARM720T
config CPU_ARM720T
bool "Support ARM720T processor" if !ARCH_CLPS711X && !ARCH_L7200 && !ARCH_CDB89712 && ARCH_INTEGRATOR
default y if ARCH_CLPS711X || ARCH_L7200 || ARCH_CDB89712 || ARCH_H720X
select CPU_32v4
select CPU_ABRT_LV4T
select CPU_CACHE_V4
select CPU_CACHE_VIVT
select CPU_COPY_V4WT
select CPU_TLB_V4WT
help
A 32-bit RISC processor with 8kByte Cache, Write Buffer and
MMU built around an ARM7TDMI core.
Say Y if you want support for the ARM720T processor.
Otherwise, say N.
# ARM920T
config CPU_ARM920T
bool "Support ARM920T processor" if !ARCH_S3C2410
depends on ARCH_EP93XX || ARCH_INTEGRATOR || ARCH_S3C2410 || ARCH_IMX || ARCH_AAEC2000 || ARCH_AT91RM9200
default y if ARCH_S3C2410 || ARCH_AT91RM9200
select CPU_32v4
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
select CPU_CACHE_VIVT
select CPU_COPY_V4WB
select CPU_TLB_V4WBI
help
The ARM920T is licensed to be produced by numerous vendors,
and is used in the Maverick EP9312 and the Samsung S3C2410.
More information on the Maverick EP9312 at
<http://linuxdevices.com/products/PD2382866068.html>.
Say Y if you want support for the ARM920T processor.
Otherwise, say N.
# ARM922T
config CPU_ARM922T
bool "Support ARM922T processor" if ARCH_INTEGRATOR
depends on ARCH_LH7A40X || ARCH_INTEGRATOR
default y if ARCH_LH7A40X
select CPU_32v4
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
select CPU_CACHE_VIVT
select CPU_COPY_V4WB
select CPU_TLB_V4WBI
help
The ARM922T is a version of the ARM920T, but with smaller
instruction and data caches. It is used in Altera's
Excalibur XA device family.
Say Y if you want support for the ARM922T processor.
Otherwise, say N.
# ARM925T
config CPU_ARM925T
bool "Support ARM925T processor" if ARCH_OMAP1
depends on ARCH_OMAP15XX
default y if ARCH_OMAP15XX
select CPU_32v4
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
select CPU_CACHE_VIVT
select CPU_COPY_V4WB
select CPU_TLB_V4WBI
help
The ARM925T is a mix between the ARM920T and ARM926T, but with
different instruction and data caches. It is used in TI's OMAP
device family.
Say Y if you want support for the ARM925T processor.
Otherwise, say N.
# ARM926T
config CPU_ARM926T
bool "Support ARM926T processor"
depends on ARCH_INTEGRATOR || ARCH_VERSATILE_PB || MACH_VERSATILE_AB || ARCH_OMAP730 || ARCH_OMAP16XX || MACH_REALVIEW_EB
default y if ARCH_VERSATILE_PB || MACH_VERSATILE_AB || ARCH_OMAP730 || ARCH_OMAP16XX
select CPU_32v5
select CPU_ABRT_EV5TJ
select CPU_CACHE_VIVT
select CPU_COPY_V4WB
select CPU_TLB_V4WBI
help
This is a variant of the ARM920. It has slightly different
instruction sequences for cache and TLB operations. Curiously,
there is no documentation on it at the ARM corporate website.
Say Y if you want support for the ARM926T processor.
Otherwise, say N.
# ARM1020 - needs validating
config CPU_ARM1020
bool "Support ARM1020T (rev 0) processor"
depends on ARCH_INTEGRATOR
select CPU_32v5
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
select CPU_CACHE_VIVT
select CPU_COPY_V4WB
select CPU_TLB_V4WBI
help
The ARM1020 is the 32K cached version of the ARM10 processor,
with an addition of a floating-point unit.
Say Y if you want support for the ARM1020 processor.
Otherwise, say N.
# ARM1020E - needs validating
config CPU_ARM1020E
bool "Support ARM1020E processor"
depends on ARCH_INTEGRATOR
select CPU_32v5
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
select CPU_CACHE_VIVT
select CPU_COPY_V4WB
select CPU_TLB_V4WBI
depends on n
# ARM1022E
config CPU_ARM1022
bool "Support ARM1022E processor"
depends on ARCH_INTEGRATOR
select CPU_32v5
select CPU_ABRT_EV4T
select CPU_CACHE_VIVT
select CPU_COPY_V4WB # can probably do better
select CPU_TLB_V4WBI
help
The ARM1022E is an implementation of the ARMv5TE architecture
based upon the ARM10 integer core with a 16KiB L1 Harvard cache,
embedded trace macrocell, and a floating-point unit.
Say Y if you want support for the ARM1022E processor.
Otherwise, say N.
# ARM1026EJ-S
config CPU_ARM1026
bool "Support ARM1026EJ-S processor"
depends on ARCH_INTEGRATOR
select CPU_32v5
select CPU_ABRT_EV5T # But need Jazelle, but EV5TJ ignores bit 10
select CPU_CACHE_VIVT
select CPU_COPY_V4WB # can probably do better
select CPU_TLB_V4WBI
help
The ARM1026EJ-S is an implementation of the ARMv5TEJ architecture
based upon the ARM10 integer core.
Say Y if you want support for the ARM1026EJ-S processor.
Otherwise, say N.
# SA110
config CPU_SA110
bool "Support StrongARM(R) SA-110 processor" if !ARCH_EBSA110 && !FOOTBRIDGE && !ARCH_TBOX && !ARCH_SHARK && !ARCH_NEXUSPCI && ARCH_RPC
default y if ARCH_EBSA110 || FOOTBRIDGE || ARCH_TBOX || ARCH_SHARK || ARCH_NEXUSPCI
select CPU_32v3 if ARCH_RPC
select CPU_32v4 if !ARCH_RPC
select CPU_ABRT_EV4
select CPU_CACHE_V4WB
select CPU_CACHE_VIVT
select CPU_COPY_V4WB
select CPU_TLB_V4WB
help
The Intel StrongARM(R) SA-110 is a 32-bit microprocessor and
is available at five speeds ranging from 100 MHz to 233 MHz.
More information is available at
<http://developer.intel.com/design/strong/sa110.htm>.
Say Y if you want support for the SA-110 processor.
Otherwise, say N.
# SA1100
config CPU_SA1100
bool
depends on ARCH_SA1100
default y
select CPU_32v4
select CPU_ABRT_EV4
select CPU_CACHE_V4WB
select CPU_CACHE_VIVT
select CPU_TLB_V4WB
# XScale
config CPU_XSCALE
bool
depends on ARCH_IOP3XX || ARCH_PXA || ARCH_IXP4XX || ARCH_IXP2000
default y
select CPU_32v5
select CPU_ABRT_EV5T
select CPU_CACHE_VIVT
select CPU_TLB_V4WBI
# ARMv6
config CPU_V6
bool "Support ARM V6 processor"
depends on ARCH_INTEGRATOR || MACH_REALVIEW_EB || ARCH_OMAP2
select CPU_32v6
select CPU_ABRT_EV6
select CPU_CACHE_V6
select CPU_CACHE_VIPT
select CPU_COPY_V6
select CPU_TLB_V6
# ARMv6k
config CPU_32v6K
bool "Support ARM V6K processor extensions" if !SMP
depends on CPU_V6
default y if SMP
help
Say Y here if your ARMv6 processor supports the 'K' extension.
This enables the kernel to use some instructions not present
on previous processors, and as such a kernel build with this
enabled will not boot on processors with do not support these
instructions.
# Figure out what processor architecture version we should be using.
# This defines the compiler instruction set which depends on the machine type.
config CPU_32v3
bool
select TLS_REG_EMUL if SMP
select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
config CPU_32v4
bool
select TLS_REG_EMUL if SMP
select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
config CPU_32v5
bool
select TLS_REG_EMUL if SMP
select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
config CPU_32v6
bool
# The abort model
config CPU_ABRT_EV4
bool
config CPU_ABRT_EV4T
bool
config CPU_ABRT_LV4T
bool
config CPU_ABRT_EV5T
bool
config CPU_ABRT_EV5TJ
bool
config CPU_ABRT_EV6
bool
# The cache model
config CPU_CACHE_V3
bool
config CPU_CACHE_V4
bool
config CPU_CACHE_V4WT
bool
config CPU_CACHE_V4WB
bool
config CPU_CACHE_V6
bool
config CPU_CACHE_VIVT
bool
config CPU_CACHE_VIPT
bool
# The copy-page model
config CPU_COPY_V3
bool
config CPU_COPY_V4WT
bool
config CPU_COPY_V4WB
bool
config CPU_COPY_V6
bool
# This selects the TLB model
config CPU_TLB_V3
bool
help
ARM Architecture Version 3 TLB.
config CPU_TLB_V4WT
bool
help
ARM Architecture Version 4 TLB with writethrough cache.
config CPU_TLB_V4WB
bool
help
ARM Architecture Version 4 TLB with writeback cache.
config CPU_TLB_V4WBI
bool
help
ARM Architecture Version 4 TLB with writeback cache and invalidate
instruction cache entry.
config CPU_TLB_V6
bool
comment "Processor Features"
config ARM_THUMB
bool "Support Thumb user binaries"
depends on CPU_ARM720T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_V6
default y
help
Say Y if you want to include kernel support for running user space
Thumb binaries.
The Thumb instruction set is a compressed form of the standard ARM
instruction set resulting in smaller binaries at the expense of
slightly less efficient code.
If you don't know what this all is, saying Y is a safe choice.
config CPU_BIG_ENDIAN
bool "Build big-endian kernel"
depends on ARCH_SUPPORTS_BIG_ENDIAN
help
Say Y if you plan on running a kernel in big-endian mode.
Note that your board must be properly built and your board
port must properly enable any big-endian related features
of your chipset/board/processor.
config CPU_ICACHE_DISABLE
bool "Disable I-Cache"
depends on CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6
help
Say Y here to disable the processor instruction cache. Unless
you have a reason not to or are unsure, say N.
config CPU_DCACHE_DISABLE
bool "Disable D-Cache"
depends on CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6
help
Say Y here to disable the processor data cache. Unless
you have a reason not to or are unsure, say N.
config CPU_DCACHE_WRITETHROUGH
bool "Force write through D-cache"
depends on (CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
default y if CPU_ARM925T
help
Say Y here to use the data cache in writethrough mode. Unless you
specifically require this or are unsure, say N.
config CPU_CACHE_ROUND_ROBIN
bool "Round robin I and D cache replacement algorithm"
depends on (CPU_ARM926T || CPU_ARM1020) && (!CPU_ICACHE_DISABLE || !CPU_DCACHE_DISABLE)
help
Say Y here to use the predictable round-robin cache replacement
policy. Unless you specifically require this or are unsure, say N.
config CPU_BPREDICT_DISABLE
bool "Disable branch prediction"
depends on CPU_ARM1020 || CPU_V6
help
Say Y here to disable branch prediction. If unsure, say N.
config TLS_REG_EMUL
bool
help
An SMP system using a pre-ARMv6 processor (there are apparently
a few prototypes like that in existence) and therefore access to
that required register must be emulated.
config HAS_TLS_REG
bool
depends on !TLS_REG_EMUL
default y if SMP || CPU_32v7
help
This selects support for the CP15 thread register.
It is defined to be available on some ARMv6 processors (including
all SMP capable ARMv6's) or later processors. User space may
assume directly accessing that register and always obtain the
expected value only on ARMv7 and above.
config NEEDS_SYSCALL_FOR_CMPXCHG
bool
help
SMP on a pre-ARMv6 processor? Well OK then.
Forget about fast user space cmpxchg support.
It is just not possible.
