Buildroot TargetOptions

配置单板架构

Target options ---> 目标板的配置

 Target Architecture：目标架构，这里选择 ARM(little endian)，ARM小端模式
 Target Binary Format：二进制格式，为 ELF
 Target Architecture Variant：架构变体为 arm920t，内核类型
 Target ABI：应用程序二进制接口，为EABI
 Floating point strategy：浮点数的策略，选择为 Soft float
 ARM instruction set：arm 汇编指令集，选择  ARM

cortex-A8配置

 Target Architecture (ARM (little endian))  --->
 Target Binary Format (ELF)  --->
 Target Architecture Variant (cortex-A8)  --->
 Target ABI (EABIhf)  --->
 Floating point strategy (VFPv3-D16)  --->
 ARM instruction set (ARM)  --->

cortex-A9配置

     Target Architecture (ARM (little endian))  --->
     Target Binary Format (ELF)  --->
     Target Architecture Variant (cortex-A9)  --->
 [*] Enable NEON SIMD extension support
 [*] Enable VFP extension support
     Target ABI (EABIhf)  --->
     Floating point strategy (VFPv3-D16)  --->
     ARM instruction set (ARM)  --->

参考链接

• 浮点类型介绍 https://wiki.debian.org/ArmHardFloatPort/VfpComparison
• 浮点类型介绍 https://embeddedartistry.com/blog/2017/10/9/r1q7pksku2q3gww9rpqef0dnskphtc
• arm官当NEON解释 https://developer.arm.com/technologies/neon