使用网盘里6.1版本的SDK编译的buildroot 无法显示自带桌面但是编译ubuntu系统没有该问题，看样子是egl无法正常启动，具体错误信息如下：
[00:00:02.299] Using config file '/etc/xdg/weston/weston.ini'
[00:00:02.301] Output repaint window is -1 ms maximum.
[00:00:02.303] Loading module '/usr/lib/libweston-14/drm-backend.so'
[00:00:02.311] initializing drm backend
[00:00:02.311] Entering mirror mode.
[00:00:02.311] Trying direct launcher...
[00:00:02.312] using /dev/dri/card0
[00:00:02.312] DRM: does not support atomic modesetting
[00:00:02.312] DRM: does not support GBM modifiers
[00:00:02.312] DRM: does not support Atomic async page flip
[00:00:02.312] DRM: supports picture aspect ratio
[00:00:02.315] failed to initialize egl
[00:00:02.315] fatal: failed to create compositor backend