配置环境命令

   export SDK=/home/user/SDK/rk3xxx 
   export KERNEL=$SDK/kernel-6.1-rt
   export
 TOOLCHAIN=$SDK/prebuilts/gcc/linux-x86/arm/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-
 gnueabihf

   export ARCH=arm
   export HOST=arm-none-linux-gnueabihf
   export CROSS_COMPILE=$TOOLCHAIN/bin/$HOST-
   export CC=${CROSS_COMPILE}gcc
   export CXX=${CROSS_COMPILE}g++
   export AR=${CROSS_COMPILE}ar
   export STRIP=${CROSS_COMPILE}strip
   export PATH=$TOOLCHAIN/bin:$PATH

验证：

  $CC -dumpmachine
  make -s -C "$KERNEL" kernelrelease

预期输出：

  arm-none-linux-gnueabihf
  6.1.172-rt59