Am335x-----------Qt5.6使用eglfs模式运行出错

linux版本

Linux am335x 3.2.0-lierda #64 Thu Jan 25 11:23:51 CST 2018 armv7l unknown

环境变量如下

export QWS_MOUSE_PROTO=MouseMan:/dev/input/mice

export QT_QWS_FONTDIR="/usr/lib/fonts"
export FONTCONFIG_PATH=/opt/qt-5.6-arm/lib/fonts
export QTDIR=/opt/qt-5.6-arm
export LD_PRELOAD=/usr/lib/preloadable_libiconv.so
export QT_QPA_FONTDIR=$QTDIR/lib/fonts
export QT_QPA_PLATFORM_PLUGIN_PATH=$QTDIR/plugins/
export LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH
export QT_QPA_PLATFORM=eglfs
export QT_QPA_EGLFS_FB=/dev/fb0
export QT_QPA_EGLFS_WIDTH=800
export QT_QPA_EGLFS_HEIGHT=480

出现问题

Could not open egl display
Aborted

希望遇到问题的一起解答一下谢谢