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add raspi3-64 readme note
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bsp/raspberry-pi/raspi3-64/README.md

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@@ -31,6 +31,16 @@ EXEC_PATH = r'E:/env_released_1.1.2/env/tools/gnu_gcc/arm_gcc/gcc-arm-8.3-2019.0
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然后在`bsp\raspberry-pi\raspi3-64\`下输入scons编译即可。
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**window环境搭建注意**
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下载完成`gcc-arm-8.3-2019.03-i686-mingw32-aarch64-elf.tar.xz`交叉编译工具链后,最好采用7-zip解压工具进行两次解压。
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确保解压目录下的`/bin/aarch64-elf-ld.exe`文件的size不为0。
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否则编译会出现如下错误:
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```
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collect2.exe:fatal error:CreateProcess:No such file or directory
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```
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### 2.2 Linux上的环境搭建
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Linux下推荐使用[gcc工具][2]。Linux版本下gcc版本可采用`gcc-arm-8.3-2019.03-x86_64-aarch64-elf`

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