| # 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 |
| |
| choice |
| prompt "Target ABI" |
| depends on BR2_arm || BR2_armeb |
| 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_MAYBE_HAS_VFPV2 || 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 |
| |
| 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. |
| |
| 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 || BR2_ARM_CPU_MAYBE_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 || BR2_ARM_CPU_MAYBE_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 || BR2_ARM_CPU_MAYBE_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 || BR2_ARM_CPU_MAYBE_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 || BR2_ARM_CPU_MAYBE_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 || BR2_ARM_CPU_MAYBE_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 |
| 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. |
| |
| 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 |
