最近專案開發需要用到qml，因為qml需要依賴OpenGL庫，所以重新配置相關環境。

一、開發環境

1.核心版本

[email protected]:~# uname -a
Linux marsboard 4.1.15 #1 SMP PREEMPT Mon Dec 19 13:55:17 CST 2016 armv7l GNU/Linux

2.檔案系統

採用yocto編譯出來的對應的核心4.1.15版本的檔案系統

3.Qt版本

採用qt5.9.4版本，下載原始碼手動編譯的qt庫（編譯時配置了OpenGL的路徑，具體後面再詳述）

4.硬體

開發板採用的是天嵌imx6Q系列，uboot和核心也是移植的官方提供的4.1.15版本（可以從天嵌官網提供的百度網盤下載）。

注意據官方資料imx6 Sololite不支援OpenGL，

二、Qt庫移植及Qt程式執行

1.庫移植

虛擬機器上編譯出來的庫檔案如下：

將qt庫移植到開發板，lib拷貝到了/usr/lib，plugins、qml拷貝到了/usr/lib/qt5

2.Qt程式的編譯

如果自己編譯Qt庫，那就需要手動修改路徑cd /usr/lib/x86_64-linux-gnu/qt-default/qtchooser/會有一個default.conf配置檔案，可以修改預設配置檔案為你編譯好的Qt庫路徑，具體不再詳述。

3.執行環境變數配置

[email protected]:~# export EGLFS_DEVICE_INTEGRATION= eglfs_viv
 
[email protected]:~# export QT_QPA_PLATFORM=eglfs
[email protected]:~# ls
bright
[email protected]:~# ./bright 
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QEglFSVivIntegration will set environment variable FB_MULTI_BUFFER=2 to enable double buffering and vsync.
 If this is not desired, you can override this via: export QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER=1
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
Facade::initializeCommand()
ApplicationFacade::initializeCommand()
Facade::initializeCommand()
QMetaObject::connectSlotsByName: No matching signal for on_toolButton_clicked()

write begin at "01:47:36.388" >>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<< write finished at "01:47:36.388" 

qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
QObject::connect: Cannot connect (null)::sendPowerValueToWidget(QString) to CentralPanel::on_setPowerData(QString)
QObject::connect: Cannot connect CentralPanel::sigSendPowerInitData(QString) to (null)::recFromWidget(QString)
QObject::connect: Cannot connect (null)::closeView() to QQuickWidget::close()
 
[email protected]:~# ^C
[email protected]:~# export   QML2_IMPORT_PATH=/usr/lib/qt5/qml
[email protected]:~# ./bright 
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QEglFSVivIntegration will set environment variable FB_MULTI_BUFFER=2 to enable double buffering and vsync.
 If this is not desired, you can override this via: export QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER=1
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
Facade::initializeCommand()
ApplicationFacade::initializeCommand()
Facade::initializeCommand()
QMetaObject::connectSlotsByName: No matching signal for on_toolButton_clicked()

write begin at "01:53:06.210" >>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<< write finished at "01:53:06.211" 

如上所述，環境變數配置完畢就可以看到介面了，qml頁面正常載入。

總結：

1.QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'這個好像不影響頁面顯示

2.天嵌官方提供的4.1.15核心支援OpenGL，這點很重要