# 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, the FPU is optional config BR2_ARM_CPU_MAYBE_HAS_FPU bool config BR2_ARM_CPU_HAS_FPU bool # for some cores, VFPv2 is optional config BR2_ARM_CPU_MAYBE_HAS_VFPV2 bool select BR2_ARM_CPU_MAYBE_HAS_FPU config BR2_ARM_CPU_HAS_VFPV2 bool select BR2_ARM_CPU_HAS_FPU # 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 # FPv4 is always optional config BR2_ARM_CPU_MAYBE_HAS_FPV4 bool select BR2_ARM_CPU_MAYBE_HAS_FPU config BR2_ARM_CPU_HAS_FPV4 bool select BR2_ARM_CPU_HAS_FPU # FPv5 is always optional config BR2_ARM_CPU_MAYBE_HAS_FPV5 bool select BR2_ARM_CPU_MAYBE_HAS_FPV4 config BR2_ARM_CPU_HAS_FPV5 bool select BR2_ARM_CPU_HAS_FPV4 config BR2_ARM_CPU_HAS_FP_ARMV8 bool select BR2_ARM_CPU_HAS_VFPV4 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 config BR2_ARM_CPU_ARMV7M bool config BR2_ARM_CPU_ARMV8A bool 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_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_FPU select BR2_ARM_CPU_HAS_FPV5 if BR2_ARM_CPU_MAYBE_HAS_FPV5 select BR2_ARM_CPU_HAS_FPV4 if BR2_ARM_CPU_MAYBE_HAS_FPV4 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. 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_FPU 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. 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. config BR2_ARM_FPU_FPV4D16 bool # "FPv4-D16" depends on BR2_ARM_CPU_HAS_FPV4 help This option allows to use the FPv4-SP (single precision) floating point unit, as available in some ARMv7m processors (Cortex-M4). config BR2_ARM_FPU_FPV5D16 bool # "FPv5-D16" depends on BR2_ARM_CPU_HAS_FPV5 select BR2_ARCH_NEEDS_GCC_AT_LEAST_5 help This option allows to use the FPv5-SP (single precision) floating point unit, as available in some ARMv7m processors (Cortex-M7). Note that if you want binary code that works on the earlier Cortex-M4, you should instead select FPv4-D16. config BR2_ARM_FPU_FPV5DPD16 bool # "FPv5-DP-D16" depends on BR2_ARM_CPU_HAS_FPV5 select BR2_ARCH_NEEDS_GCC_AT_LEAST_5 help This option allows to use the FPv5-DP (double precision) floating point unit, as available in some ARMv7m processors (Cortex-M7). Note that if you want binary code that works on the earlier Cortex-M4, you should instead select FPv4-D16. 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. 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. config BR2_ARCH default "arm" if BR2_arm default "armeb" if BR2_armeb default "aarch64" if BR2_aarch64 default "aarch64_be" if BR2_aarch64_be config BR2_ENDIAN default "LITTLE" if (BR2_arm || BR2_aarch64) default "BIG" if (BR2_armeb || BR2_aarch64_be) config BR2_GCC_TARGET_CPU # armv7a 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-a15.cortex-a7" if BR2_cortex_a15_a7 default "cortex-a17" if BR2_cortex_a17 default "cortex-a17.cortex-a7" if BR2_cortex_a17_a7 default "marvell-pj4" if BR2_pj4 config BR2_GCC_TARGET_ABI default "aapcs-linux" if BR2_arm || BR2_armeb default "lp64" if BR2_aarch64 || BR2_aarch64_be 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 default "fpv4-sp-d16" if BR2_ARM_FPU_FPV4D16 default "fpv5-sp-d16" if BR2_ARM_FPU_FPV5D16 default "fpv5-d16" if BR2_ARM_FPU_FPV5DPD16 default "fp-armv8" if BR2_ARM_FPU_FP_ARMV8 default "neon-fp-armv8" if BR2_ARM_FPU_NEON_FP_ARMV8 depends on BR2_arm || BR2_armeb 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 config BR2_READELF_ARCH_NAME default "ARM" if BR2_arm || BR2_armeb default "AArch64" if BR2_aarch64 || BR2_aarch64_be # vim: ft=kconfig # -*- mode:kconfig; -*-