查看Buildroot trouble shootings的源代码 Buildroot trouble shootings 0

1. toolchain-external-custom  Configuring
   Incorrect selection of kernel headers: expected 4.10.x, got 4.20.x
=> toolchain 配置错误, modify configd/defconfig
<source lang="java">
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
BR2_TOOLCHAIN_EXTERNAL_PATH="/opt/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu"
BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX="aarch64-linux-gnu"
BR2_TOOLCHAIN_EXTERNAL_GCC_7=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_10=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
BR2_TOOLCHAIN_EXTERNAL_CXX=y
</source>
To check kernel headers version of the toolchain:
cat /opt/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/libc/usr/include/linux/version.h
<source lang="java">
#define LINUX_VERSION_CODE 264707 (=0x040a03)
</source>
Match the required version 4.10

2. Download package too slow
Use download_cache, add
<source lang="java">
BR2_DL_DIR="/data/download_cache/buildroot"
</source>