466 lines
14 KiB
Plaintext
466 lines
14 KiB
Plaintext
# arm cpu features
|
|
config BR2_ARM_CPU_HAS_NEON
|
|
bool
|
|
|
|
# for some cores, NEON support is optional
|
|
config BR2_ARM_CPU_MAYBE_HAS_NEON
|
|
bool
|
|
|
|
# for some cores, VFPv2 is optional
|
|
config BR2_ARM_CPU_MAYBE_HAS_VFPV2
|
|
bool
|
|
|
|
config BR2_ARM_CPU_HAS_VFPV2
|
|
bool
|
|
|
|
# for some cores, VFPv3 is optional
|
|
config BR2_ARM_CPU_MAYBE_HAS_VFPV3
|
|
bool
|
|
select BR2_ARM_CPU_MAYBE_HAS_VFPV2
|
|
|
|
config BR2_ARM_CPU_HAS_VFPV3
|
|
bool
|
|
select BR2_ARM_CPU_HAS_VFPV2
|
|
|
|
# for some cores, VFPv4 is optional
|
|
config BR2_ARM_CPU_MAYBE_HAS_VFPV4
|
|
bool
|
|
select BR2_ARM_CPU_MAYBE_HAS_VFPV3
|
|
|
|
config BR2_ARM_CPU_HAS_VFPV4
|
|
bool
|
|
select BR2_ARM_CPU_HAS_VFPV3
|
|
|
|
config BR2_ARM_CPU_HAS_ARM
|
|
bool
|
|
|
|
config BR2_ARM_CPU_HAS_THUMB
|
|
bool
|
|
|
|
config BR2_ARM_CPU_HAS_THUMB2
|
|
bool
|
|
|
|
config BR2_ARM_CPU_ARMV4
|
|
bool
|
|
|
|
config BR2_ARM_CPU_ARMV5
|
|
bool
|
|
|
|
config BR2_ARM_CPU_ARMV6
|
|
bool
|
|
|
|
config BR2_ARM_CPU_ARMV7A
|
|
bool
|
|
|
|
choice
|
|
prompt "Target Architecture Variant"
|
|
depends on BR2_arm || BR2_armeb
|
|
default BR2_arm926t
|
|
help
|
|
Specific CPU variant to use
|
|
|
|
config BR2_arm920t
|
|
bool "arm920t"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV4
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_arm922t
|
|
bool "arm922t"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV4
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_arm926t
|
|
bool "arm926t"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_MAYBE_HAS_VFPV2
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV5
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_arm1136j_s
|
|
bool "arm1136j-s"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV6
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_arm1136jf_s
|
|
bool "arm1136jf-s"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_VFPV2
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV6
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_arm1176jz_s
|
|
bool "arm1176jz-s"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV6
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_arm1176jzf_s
|
|
bool "arm1176jzf-s"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_VFPV2
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV6
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_cortex_a5
|
|
bool "cortex-A5"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_MAYBE_HAS_NEON
|
|
select BR2_ARM_CPU_MAYBE_HAS_VFPV4
|
|
select BR2_ARM_CPU_HAS_THUMB2
|
|
select BR2_ARM_CPU_ARMV7A
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_cortex_a7
|
|
bool "cortex-A7"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_NEON
|
|
select BR2_ARM_CPU_HAS_VFPV4
|
|
select BR2_ARM_CPU_HAS_THUMB2
|
|
select BR2_ARM_CPU_ARMV7A
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_cortex_a8
|
|
bool "cortex-A8"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_NEON
|
|
select BR2_ARM_CPU_HAS_VFPV3
|
|
select BR2_ARM_CPU_HAS_THUMB2
|
|
select BR2_ARM_CPU_ARMV7A
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_cortex_a9
|
|
bool "cortex-A9"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_MAYBE_HAS_NEON
|
|
select BR2_ARM_CPU_MAYBE_HAS_VFPV3
|
|
select BR2_ARM_CPU_HAS_THUMB2
|
|
select BR2_ARM_CPU_ARMV7A
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_cortex_a12
|
|
bool "cortex-A12"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_NEON
|
|
select BR2_ARM_CPU_HAS_VFPV4
|
|
select BR2_ARM_CPU_HAS_THUMB2
|
|
select BR2_ARM_CPU_ARMV7A
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_cortex_a15
|
|
bool "cortex-A15"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_NEON
|
|
select BR2_ARM_CPU_HAS_VFPV4
|
|
select BR2_ARM_CPU_HAS_THUMB2
|
|
select BR2_ARM_CPU_ARMV7A
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_cortex_m3
|
|
bool "cortex-M3"
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_HAS_THUMB2
|
|
config BR2_fa526
|
|
bool "fa526/626"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_ARMV4
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_pj4
|
|
bool "pj4"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_VFPV3
|
|
select BR2_ARM_CPU_ARMV7A
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_strongarm
|
|
bool "strongarm sa110/sa1100"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_ARMV4
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_xscale
|
|
bool "xscale"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_HAS_THUMB
|
|
select BR2_ARM_CPU_ARMV5
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
config BR2_iwmmxt
|
|
bool "iwmmxt"
|
|
select BR2_ARM_CPU_HAS_ARM
|
|
select BR2_ARM_CPU_ARMV5
|
|
select BR2_ARCH_HAS_MMU_OPTIONAL
|
|
endchoice
|
|
|
|
config BR2_ARM_ENABLE_NEON
|
|
bool "Enable NEON SIMD extension support"
|
|
depends on BR2_ARM_CPU_MAYBE_HAS_NEON
|
|
select BR2_ARM_CPU_HAS_NEON
|
|
help
|
|
For some CPU cores, the NEON SIMD extension is optional.
|
|
Select this option if you are certain your particular
|
|
implementation has NEON support and you want to use it.
|
|
|
|
config BR2_ARM_ENABLE_VFP
|
|
bool "Enable VFP extension support"
|
|
depends on BR2_ARM_CPU_MAYBE_HAS_VFPV2
|
|
select BR2_ARM_CPU_HAS_VFPV4 if BR2_ARM_CPU_MAYBE_HAS_VFPV4
|
|
select BR2_ARM_CPU_HAS_VFPV3 if BR2_ARM_CPU_MAYBE_HAS_VFPV3
|
|
select BR2_ARM_CPU_HAS_VFPV2 if BR2_ARM_CPU_MAYBE_HAS_VFPV2
|
|
help
|
|
For some CPU cores, the VFP extension is optional. Select
|
|
this option if you are certain your particular
|
|
implementation has VFP support and you want to use it.
|
|
|
|
choice
|
|
prompt "Target ABI"
|
|
depends on BR2_arm || BR2_armeb
|
|
default BR2_ARM_EABIHF if BR2_ARM_CPU_HAS_VFPV2
|
|
default BR2_ARM_EABI
|
|
help
|
|
Application Binary Interface to use. The Application Binary
|
|
Interface describes the calling conventions (how arguments
|
|
are passed to functions, how the return value is passed, how
|
|
system calls are made, etc.).
|
|
|
|
config BR2_ARM_EABI
|
|
bool "EABI"
|
|
help
|
|
The EABI is currently the standard ARM ABI, which is used in
|
|
most projects. It supports both the 'soft' floating point
|
|
model (in which floating point instructions are emulated in
|
|
software) and the 'softfp' floating point model (in which
|
|
floating point instructions are executed using an hardware
|
|
floating point unit, but floating point arguments to
|
|
functions are passed in integer registers).
|
|
|
|
The 'softfp' floating point model is link-compatible with
|
|
the 'soft' floating point model, i.e you can link a library
|
|
built 'soft' with some other code built 'softfp'.
|
|
|
|
However, passing the floating point arguments in integer
|
|
registers is a bit inefficient, so if your ARM processor has
|
|
a floating point unit, and you don't have pre-compiled
|
|
'soft' or 'softfp' code, using the EABIhf ABI will provide
|
|
better floating point performances.
|
|
|
|
If your processor does not have a floating point unit, then
|
|
you must use this ABI.
|
|
|
|
config BR2_ARM_EABIHF
|
|
bool "EABIhf"
|
|
depends on BR2_ARM_CPU_HAS_VFPV2
|
|
help
|
|
The EABIhf is an extension of EABI which supports the 'hard'
|
|
floating point model. This model uses the floating point
|
|
unit to execute floating point instructions, and passes
|
|
floating point arguments in floating point registers.
|
|
|
|
It is more efficient than EABI for floating point related
|
|
workload. However, it does not allow to link against code
|
|
that has been pre-built for the 'soft' or 'softfp' floating
|
|
point models.
|
|
|
|
If your processor has a floating point unit, and you don't
|
|
depend on existing pre-compiled code, this option is most
|
|
likely the best choice.
|
|
|
|
endchoice
|
|
|
|
choice
|
|
prompt "Floating point strategy"
|
|
depends on BR2_ARM_EABI || BR2_ARM_EABIHF
|
|
default BR2_ARM_FPU_VFPV4D16 if BR2_ARM_CPU_HAS_VFPV4
|
|
default BR2_ARM_FPU_VFPV3D16 if BR2_ARM_CPU_HAS_VFPV3
|
|
default BR2_ARM_FPU_VFPV2 if BR2_ARM_CPU_HAS_VFPV2
|
|
default BR2_ARM_SOFT_FLOAT if !BR2_ARM_CPU_HAS_VFPV2
|
|
|
|
config BR2_ARM_SOFT_FLOAT
|
|
bool "Soft float"
|
|
depends on BR2_ARM_EABI
|
|
select BR2_SOFT_FLOAT
|
|
help
|
|
This option allows to use software emulated floating
|
|
point. It should be used for ARM cores that do not include a
|
|
Vector Floating Point unit, such as ARMv5 cores (ARM926 for
|
|
example) or certain ARMv6 cores.
|
|
|
|
config BR2_ARM_FPU_VFPV2
|
|
bool "VFPv2"
|
|
depends on BR2_ARM_CPU_HAS_VFPV2
|
|
help
|
|
This option allows to use the VFPv2 floating point unit, as
|
|
available in some ARMv5 processors (ARM926EJ-S) and some
|
|
ARMv6 processors (ARM1136JF-S, ARM1176JZF-S and ARM11
|
|
MPCore).
|
|
|
|
Note that this option is also safe to use for newer cores
|
|
such as Cortex-A, because the VFPv3 and VFPv4 units are
|
|
backward compatible with VFPv2.
|
|
|
|
config BR2_ARM_FPU_VFPV3
|
|
bool "VFPv3"
|
|
depends on BR2_ARM_CPU_HAS_VFPV3
|
|
help
|
|
This option allows to use the VFPv3 floating point unit, as
|
|
available in some ARMv7 processors (Cortex-A{8, 9}). This
|
|
option requires a VFPv3 unit that has 32 double-precision
|
|
registers, which is not necessarily the case in all SOCs
|
|
based on Cortex-A{8, 9}. If you're unsure, use VFPv3-D16
|
|
instead, which is guaranteed to work on all Cortex-A{8, 9}.
|
|
|
|
Note that this option is also safe to use for newer cores
|
|
that have a VFPv4 unit, because VFPv4 is backward compatible
|
|
with VFPv3. They must of course also have 32
|
|
double-precision registers.
|
|
|
|
config BR2_ARM_FPU_VFPV3D16
|
|
bool "VFPv3-D16"
|
|
depends on BR2_ARM_CPU_HAS_VFPV3
|
|
help
|
|
This option allows to use the VFPv3 floating point unit, as
|
|
available in some ARMv7 processors (Cortex-A{8, 9}). This
|
|
option requires a VFPv3 unit that has 16 double-precision
|
|
registers, which is generally the case in all SOCs based on
|
|
Cortex-A{8, 9}, even though VFPv3 is technically optional on
|
|
Cortex-A9. This is the safest option for those cores.
|
|
|
|
Note that this option is also safe to use for newer cores
|
|
such that have a VFPv4 unit, because the VFPv4 is backward
|
|
compatible with VFPv3.
|
|
|
|
config BR2_ARM_FPU_VFPV4
|
|
bool "VFPv4"
|
|
depends on BR2_ARM_CPU_HAS_VFPV4
|
|
help
|
|
This option allows to use the VFPv4 floating point unit, as
|
|
available in some ARMv7 processors (Cortex-A{5, 7, 12,
|
|
15}). This option requires a VFPv4 unit that has 32
|
|
double-precision registers, which is not necessarily the
|
|
case in all SOCs based on Cortex-A{5, 7, 12, 15}. If you're
|
|
unsure, you should probably use VFPv4-D16 instead.
|
|
|
|
Note that if you want binary code that works on all ARMv7
|
|
cores, including the earlier Cortex-A{8, 9}, you should
|
|
instead select VFPv3.
|
|
|
|
config BR2_ARM_FPU_VFPV4D16
|
|
bool "VFPv4-D16"
|
|
depends on BR2_ARM_CPU_HAS_VFPV4
|
|
help
|
|
This option allows to use the VFPv4 floating point unit, as
|
|
available in some ARMv7 processors (Cortex-A{5, 7, 12,
|
|
15}). This option requires a VFPv4 unit that has 16
|
|
double-precision registers, which is always available on
|
|
Cortex-A12 and Cortex-A15, but optional on Cortex-A5 and
|
|
Cortex-A7.
|
|
|
|
Note that if you want binary code that works on all ARMv7
|
|
cores, including the earlier Cortex-A{8, 9}, you should
|
|
instead select VFPv3-D16.
|
|
|
|
config BR2_ARM_FPU_NEON
|
|
bool "NEON"
|
|
depends on BR2_ARM_CPU_HAS_NEON
|
|
help
|
|
This option allows to use the NEON SIMD unit, as available
|
|
in some ARMv7 processors, as a floating-point unit. It
|
|
should however be noted that using NEON for floating point
|
|
operations doesn't provide a complete compatibility with the
|
|
IEEE 754.
|
|
|
|
config BR2_ARM_FPU_NEON_VFPV4
|
|
bool "NEON/VFPv4"
|
|
depends on BR2_ARM_CPU_HAS_VFPV4
|
|
depends on BR2_ARM_CPU_HAS_NEON
|
|
help
|
|
This option allows to use both the VFPv4 and the NEON SIMD
|
|
units for floating point operations. Note that some ARMv7
|
|
cores do not necessarily have VFPv4 and/or NEON support, for
|
|
example on Cortex-A5 and Cortex-A7, support for VFPv4 and
|
|
NEON is optional.
|
|
|
|
endchoice
|
|
|
|
choice
|
|
prompt "ARM instruction set"
|
|
|
|
config BR2_ARM_INSTRUCTIONS_ARM
|
|
bool "ARM"
|
|
depends on BR2_ARM_CPU_HAS_ARM
|
|
help
|
|
This option instructs the compiler to generate regular ARM
|
|
instructions, that are all 32 bits wide.
|
|
|
|
config BR2_ARM_INSTRUCTIONS_THUMB
|
|
bool "Thumb"
|
|
depends on BR2_ARM_CPU_HAS_THUMB
|
|
# Thumb-1 and VFP are not compatible
|
|
depends on BR2_ARM_SOFT_FLOAT
|
|
help
|
|
This option instructions the compiler to generate Thumb
|
|
instructions, which allows to mix 16 bits instructions and
|
|
32 bits instructions. This generally provides a much smaller
|
|
compiled binary size.
|
|
|
|
comment "Thumb1 is not compatible with VFP"
|
|
depends on BR2_ARM_CPU_HAS_THUMB
|
|
depends on !BR2_ARM_SOFT_FLOAT
|
|
|
|
config BR2_ARM_INSTRUCTIONS_THUMB2
|
|
bool "Thumb2"
|
|
depends on BR2_ARM_CPU_HAS_THUMB2
|
|
help
|
|
This option instructions the compiler to generate Thumb2
|
|
instructions, which allows to mix 16 bits instructions and
|
|
32 bits instructions. This generally provides a much smaller
|
|
compiled binary size.
|
|
|
|
endchoice
|
|
|
|
config BR2_ARCH
|
|
default "arm" if BR2_arm
|
|
default "armeb" if BR2_armeb
|
|
|
|
config BR2_ENDIAN
|
|
default "LITTLE" if BR2_arm
|
|
default "BIG" if BR2_armeb
|
|
|
|
config BR2_ARCH_HAS_ATOMICS
|
|
default y
|
|
|
|
config BR2_GCC_TARGET_CPU
|
|
default "arm920t" if BR2_arm920t
|
|
default "arm922t" if BR2_arm922t
|
|
default "arm926ej-s" if BR2_arm926t
|
|
default "arm1136j-s" if BR2_arm1136j_s
|
|
default "arm1136jf-s" if BR2_arm1136jf_s
|
|
default "arm1176jz-s" if BR2_arm1176jz_s
|
|
default "arm1176jzf-s" if BR2_arm1176jzf_s
|
|
default "cortex-a5" if BR2_cortex_a5
|
|
default "cortex-a7" if BR2_cortex_a7
|
|
default "cortex-a8" if BR2_cortex_a8
|
|
default "cortex-a9" if BR2_cortex_a9
|
|
default "cortex-a12" if BR2_cortex_a12
|
|
default "cortex-a15" if BR2_cortex_a15
|
|
default "cortex-m3" if BR2_cortex_m3
|
|
default "fa526" if BR2_fa526
|
|
default "marvell-pj4" if BR2_pj4
|
|
default "strongarm" if BR2_strongarm
|
|
default "xscale" if BR2_xscale
|
|
default "iwmmxt" if BR2_iwmmxt
|
|
|
|
config BR2_GCC_TARGET_ABI
|
|
default "aapcs-linux"
|
|
|
|
config BR2_GCC_TARGET_FPU
|
|
default "vfp" if BR2_ARM_FPU_VFPV2
|
|
default "vfpv3" if BR2_ARM_FPU_VFPV3
|
|
default "vfpv3-d16" if BR2_ARM_FPU_VFPV3D16
|
|
default "vfpv4" if BR2_ARM_FPU_VFPV4
|
|
default "vfpv4-d16" if BR2_ARM_FPU_VFPV4D16
|
|
default "neon" if BR2_ARM_FPU_NEON
|
|
default "neon-vfpv4" if BR2_ARM_FPU_NEON_VFPV4
|
|
|
|
config BR2_GCC_TARGET_FLOAT_ABI
|
|
default "soft" if BR2_ARM_SOFT_FLOAT
|
|
default "softfp" if !BR2_ARM_SOFT_FLOAT && BR2_ARM_EABI
|
|
default "hard" if !BR2_ARM_SOFT_FLOAT && BR2_ARM_EABIHF
|
|
|
|
config BR2_GCC_TARGET_MODE
|
|
default "arm" if BR2_ARM_INSTRUCTIONS_ARM
|
|
default "thumb" if BR2_ARM_INSTRUCTIONS_THUMB || BR2_ARM_INSTRUCTIONS_THUMB2
|