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|
/****************************************************************************
**
** Copyright (c) 2013 Digia Plc and/or its subsidiary(-ies).
**
** Qt and Qt logos are trademarks of of Digia Corporation in Finland and/or
** other countries worldwide. All other trademarks are property of their
** respective owners.
**
**
** Licensees holding valid Qt Commercial licenses may use this document in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in a
** written agreement between you and Digia.
**
**
****************************************************************************/
/*!
\contentspage{index.html}{Boot to Qt}
\page index.html
\nextpage b2qt-installation-guide.html
\title Boot to Qt Introduction
\e{\b{IMPORTANT:} Make sure to follow the \l{Installation Guide}
closely!}
\section1 Contents
\list
\li \b {\l{Installation Guide}}
\li \b {\l{Preparing Hardware}}
\list
\li \l{Preparing Nexus 7}{Nexus 7 (embedded Android)}
\li \l{Preparing Sabre Lite i.MX 6}{Sabre Lite i.MX 6 (embedded Android)}
\li \l{Preparing BeagleBoard-xM}{BeagleBoard-xM (embedded Android and Linux)}
\li \l{Preparing Raspberry Pi}{Raspberry Pi Model B (embedded Linux)}
\endlist
\li \b {\l{Building and Running an Example}}
\li \b {\l{Customization}}
\li \b {\l{Supported Platforms}}
\li \b {\l{Troubleshooting}}
\endlist
\section1 What is \B2Q?
\e{\b{\B2Q}} is a light-weight UI stack for embedded systems, based on the
\l{http://qt.digia.com/}{Qt Framework} by Digia, offering an elegant
means of developing beautiful and performant embedded devices. It supports
two different operating systems:
\list
\li \b{\B2QA} places Qt on top of an Android (version 4.1 or higher)
kernel/baselayer.
\li \b{\B2QL} places Qt on top of an Linux kernel/baselayer, built
using Yocto 1.4 'Dylan' release.
\endlist
Both versions have been tested and verified on a number of different
hardware configurations. \B2Q support is not limited to the devices used
as reference platforms, it can be made to run on a variety of hardware.
\section1 \SDK
\SDK includes the \B2Q stack, providing a complete software development
package for creating applications on embedded devices. It comes with
the Qt Creator IDE with preconfigured build targets for hardware
platforms as well as an \l{Emulator}{emulator}.
\section1 About Qt
\l{http://qt.digia.com/}{Qt} is a full development framework with tools
designed to streamline the creation of applications and user interfaces
for desktop, embedded and mobile platforms.
\list
\li \b{Qt Framework} - intuitive APIs for C++
and CSS/JavaScript-like programming with
\b{Qt Quick} for rapid UI
creation
\li \b{Qt Creator IDE} - powerful cross-platform integrated development
environment, including UI designer tools and on-device debugging
\li \b{Tools and toolchains} - internationalization support, embedded
toolchains and more.
\endlist
With Qt, you can reuse code efficiently to target multiple platforms
with one code base. The modular C++ class library and developer tools
enables developers to create applications for one platform and easily
build and run to deploy also on other platforms.
\section1 \B2Q vs Qt for Android
\image b2qt-vs-qt-for-android.png
\e{\b{Qt for Android}} is a port of the Qt Framework to be used for application
development on the Android platform. Its purpose is to enable development
of applications that can run on Android devices. For developers writing
applications for the Android ecosystem, Qt for Android is the right choice.
\b{\B2QA} tries to strip down the Android
stack to the bare minimum, relying only on basic Linux
features. The majority of the Android stack, such as
\e{Dalvik virtual machine} is not running in \B2Q,
resulting in faster startup times, lower memory consumption and
overall better performance.
\b{\B2QL} is build from scratch using Yocto 1.4 tools
to contain only components required in the embedded device, resulting
in smaller image sizes while keeping valuable development tools available.
*/
/*!
\page b2qt-installation-guide.html
\title Installation Guide
\previouspage index.html
\nextpage b2qt-preparing-hardware.html
\e{IMPORTANT: The \SDK requires the following installation steps to be followed closely.}
In case of problems, see the \l{Troubleshooting} information and the
\l{http://qt.digia.com/en/Product/Boot-to-Qt/Boot-to-Qt-Known-Issues/}
{Boot to Qt Known Issues} page.
\target Requirements for Development Host
\section1 0. Requirements for Development Host
A 64-bit Linux system is required to install and use \SDK. Instructions
in this documentation assume Ubuntu Linux 64-bit 12.04 LTS or later.
Other Linux distributions may work, but have not been tested. C/C++ build
essentials must be installed.
\target Installing 32-bit Support Libraries
\section1 1. Installing 32-bit Support Libraries
Some of the build tools in \B2Q are 32-bit programs, and on 64-bit
systems they require that support libraries for running 32-bit
code are present in the system. To install the required packages
in Ubuntu, use the following command in a terminal:
\code
sudo apt-get install g++-multilib ia32-libs
\endcode
\target Installing VirtualBox
\section1 2. Installing VirtualBox
The emulator in \B2Q relies on VirtualBox virtualization software. You can
download it from \l{https://www.virtualbox.org/wiki/Linux_Downloads} or
install it from the command line with the following command:
\code
sudo apt-get install virtualbox
\endcode
\b{Configuring VirtualBox}
Open VirtualBox network settings: Select \b{File > Preferences...}
and click on the \b{Network} tab. Create a new network named
\e{vboxnet0} and edit its properties:
\list
\li Change IPv4 address to 192.168.56.1 and IPv4 network mask to 255.255.255.0.
\li Check \b{Enable Server} in \b{DCHP Server} tab.
\li Change server address to 192.168.56.1.
\li Change both the lower and upper address bounds to 192.168.56.101.
\endlist
\section1 3. Installing the \SDK
If you have not already installed the SDK, do it as follows.
After downloading the binary installer for the SDK,
make sure it is executable either by
\list
\li Using \c{chmod +x <filename>} command, or
\li Right-clicking on the file, selecting \b{Properties}, and checking
\b{Allow executing file as program} on the \b{Permissions} tab.
\endlist
Run the installer and follow its instructions.
The installer will let you select a directory where the SDK will be
installed. In the rest of this documentation, that directory is referred
to as \b{\c{<SDK_INSTALL_DIR>}}. The default installation directory is
\tt{~/Qt}.
\target Installing Boot to Qt on Target Devices
\section1 4. Install \B2Q on Target Devices
\e{If targeting only the emulator, this step may be skipped}
Before deploying and testing your Qt application on hardware, the
target device needs to be flashed with an image that contains the
\B2Q stack. These steps vary from device to device. See the
following chapter and follow the instructions specific to
your device.
\list
\li \l {Preparing Hardware}
\endlist
\section1 5. Setting up USB Access to Embedded Devices
\e{If targeting only the emulator, this step may be skipped}
\include b2qt-post-install-setup.qdocinc setting up usb access
\section1 6. Configuring a Device Kit in Qt Creator
\include b2qt-post-install-setup.qdocinc configuring device kit
\b {You are now ready to start developing for your device!}
See \l{Building and Running an Example}
*/
/*!
\page b2qt-preparing-hardware.html
\title Preparing Hardware
\previouspage b2qt-installation-guide.html
\nextpage b2qt-building-and-running.html
Before deploying and testing your Qt application on hardware, the
target device needs to be flashed with an image that contains the
\B2Q stack. These steps vary from device to device:
\list
\li \l{Nexus 7 (embedded Android)}
\li \l{Sabre Lite i.MX 6 (embedded Android)}
\li \l{BeagleBoard-xM (embedded Android and Linux)}
\li \l{Raspberry Pi Model B (embedded Linux)}
\endlist
If you are only using the emulator, you can skip this step
and continue straight to \l {Building and Running an Example}.
*/
/*!
\target Nexus 7 (embedded Android)
\page b2qt-preparing-hardware-nexus-7.html
\title Preparing Nexus 7
\previouspage b2qt-installation-guide.html
\nextpage b2qt-building-and-running.html
When using a \l{http://www.google.com/nexus/7/specs/}{Nexus 7} as a
development device, following steps are required to prepare it for
\B2Q.
\section1 Unlocking Nexus 7 Bootloader
The Nexus 7 Bootloader has to be unlocked to allow custom software
to be installed. This has to be done only once.
\list 1
\li Power down the device.
\li Connect it to the development host with a USB cable.
\li Start the Nexus up in \e{fastboot} mode: Press the power button for a second, and then keep the Volume Down key pressed, until you see a screen with a green robot with its front panel open. Note: If you get the ordinary startup screen instead, just power it down and try again.
\li On the development host, give the command
\code
sudo <SDK_INSTALL_DIR>/Tools/b2qt/fastboot oem unlock
\endcode
The Nexus screen will ask if you want to unlock the bootloader. Press power button to confirm.
\li Wait a few seconds, and check that the text line stating the \c{LOCK STATE} now says \c{UNLOCKED}.
\endlist
\section1 Updating a Nexus 7 with \B2Q Images
\note \b{It is important that the steps in this section are repeated
every time after updating the \SDK.}
An unlocked Nexus 7 device can now be updated with a \B2Q image.
To do so, first make sure that the device is in \e{fastboot} mode
(see above), and connected to the development host via USB.
Then, re-flash the \e{boot}, \e{system}, and \e{userdata} partitions on the
device, using the following commands in the order they are listed:
\code
cd <SDK_INSTALL_DIR>
sudo ./Tools/b2qt/fastboot flash boot Boot2Qt-1.0/nexus7-eAndroid/images/boot.img
sudo ./Tools/b2qt/fastboot flash system Boot2Qt-1.0/nexus7-eAndroid/images/system.img
sudo ./Tools/b2qt/fastboot flash userdata Boot2Qt-1.0/nexus7-eAndroid/images/data.img
\endcode
Once the flashing is completed successfully, reboot the device:
\code
sudo ./Tools/b2qt/fastboot reboot
\endcode
\note Until the next step is performed, the Nexus 7 will not
boot correctly (the screen will only show the "Google" logo).
\section1 Installing Proprietary Drivers
Download the proprietary drivers for your Nexus 7. The following script will download the third
party drivers from \l{https://developers.google.com/android/nexus/drivers#grouperjdq39}
{https://developers.google.com/android/nexus/drivers#grouperjdq39}
\code
cd <SDK_INSTALL_DIR>
./Boot2Qt-1.0/nexus7-eAndroid/images/download.sh
\endcode
\note Only the version "Android 4.2.2 (JDQ39 to JDQ39E)" will work with the current \B2Q image.
Make sure your Nexus 7 is powered up, is \e{not} in fastboot mode,
and is connected to the computer via USB.
Then, follow these steps to update the Nexus 7:
\note Make sure you have read the license terms enclosed in each individual extractor
\list 1
\li Run the driver extractors:
\code
cd Boot2Qt-1.0/nexus7-eAndroid/images/drivers
./extract-nvidia-grouper.sh
./extract-asus-grouper.sh
./extract-invensense-grouper.sh
cd -
\endcode
\li Find out the serial number of the connected Nexus 7 device:
\code
./Tools/b2qt/adb devices
\endcode
\li Deploy the drivers to your device using the following command:
\code
./Boot2Qt-1.0/nexus7-eAndroid/images/deploy.sh <serial_number>
\endcode
\endlist
After the installation is complete, power up the device and confirm that it shows
a \B2Q welcome screen and/or demo.
\section1 Setting up USB Access
\include b2qt-post-install-setup.qdocinc setting up usb access
\section1 Configuring a Device Kit in Qt Creator
\include b2qt-post-install-setup.qdocinc configuring device kit
\b {You are now ready to start developing for your device!}
See \l{Building and Running an Example}
*/
/*!
\target BeagleBoard-xM (embedded Android and Linux)
\page b2qt-preparing-hardware-beagleboard.html
\title Preparing BeagleBoard-xM
\previouspage b2qt-installation-guide.html
\nextpage b2qt-building-and-running.html
When using a \l{http://beagleboard.org/hardware-xM}{BeagleBoard-xM} as a
development device, following steps are required to prepare it for
\B2Q.
\note \b{It is important that the steps in this section are repeated
every time after updating the \SDK.}
The images containing \B2Q stack for BeagleBoard-xM is included in the SDK,
ready to be copied to a micro-SD card.
\section1 Preparing a Micro-SD Card
For \B2QA, a micro-SD card of at least 2GB capacity is needed. For \B2QL,
a card of at least 512MB capacity is sufficient.
\include detect-sd-card-device-name.qdocinc instructions
\section1 Installing the \B2Q Image
The commands used in this step vary depending on whether you are developing
for embedded Android or embedded Linux.
Write the image to the micro-SD card:
\list
\li \b{\B2QA}
\code
cd <SDK_INSTALL_DIR>
sudo dd if=Boot2Qt-1.0/beagleboard-eAndroid/images/sdcard.img of=/dev/XXX bs=1M
\endcode
\li \b{\B2QL}
\code
cd <SDK_INSTALL_DIR>
sudo Boot2Qt-1.0/beagleboard-eLinux/images/deploy.sh /dev/XXX
\endcode
\endlist
After the image has been deployed, power up the device and confirm that it shows
a \B2Q welcome screen and/or demo.
\section1 Setting up USB Access
\include b2qt-post-install-setup.qdocinc setting up usb access
\section1 Configuring a Device Kit in Qt Creator
\include b2qt-post-install-setup.qdocinc configuring device kit
\b {You are now ready to start developing for your device!}
See \l{Building and Running an Example}
*/
/*!
\target Sabre Lite i.MX 6 (embedded Android)
\page b2qt-preparing-hardware-imx6.html
\title Preparing Sabre Lite i.MX 6
\previouspage b2qt-installation-guide.html
When using a
\l{http://boundarydevices.com/products/sabre-lite-imx6-sbc/}{Sabre
Lite i.MX 6} as a development device, following steps are required
to prepare it for \B2QA.
\note \b{It is important that the steps in this section are repeated
every time after updating the \SDK.}
The images containing \B2Q stack for Sabre Lite i.MX 6 is included in the SDK,
ready to be copied to a micro-SD card.
\section1 Preparing a Micro-SD Card
For \B2QA, a micro-SD card of at least 4GB capacity is needed.
\include detect-sd-card-device-name.qdocinc instructions
\section1 Installing the Android image
Download the package \e{imx6-jb-20130628.tar.gz} from
\l{http://boundarydevices.com/android-jellybean-on-i-mx6-with-no-disclaimers/}{Boundary
Devices Android Jellybean i.MX6 images} (registration required).
Use the following commands to create a micro-SD card containing the
downloaded image:
\list
\li Extract the downloaded package
\code
~/$ mkdir bd-android
~/$ cd bd-android
~/bd-android$ sudo tar zxvf ~/Downloads/imx6-jb-20130628.tar.gz
\endcode
\li Run device/boundary/mksdcard.sh:
\code
~/bd-android$ sudo device/boundary/mksdcard.sh /dev/XXX
~/bd-android$ sync
\endcode
\endlist
\section1 Installing the \B2Q Image
Make sure you have the required tools installed in your development machine:
\code
sudo apt-get install u-boot-tools
\endcode
Then, upgrade the micro-SD Card with \B2QA:
\code
cd <SDK_INSTALL_DIR>
Boot2Qt-1.0/iMX6-eAndroid/images/deploy.sh /dev/XXX
\endcode
After the installation is complete, power up the device and confirm that it shows
a \B2Q welcome screen and/or demo.
\section1 Setting up USB Access
\include b2qt-post-install-setup.qdocinc setting up usb access
\section1 Configuring a Device Kit in Qt Creator
\include b2qt-post-install-setup.qdocinc configuring device kit
\b {You are now ready to start developing for your device!}
See \l{Building and Running an Example}
*/
/*!
\target Raspberry Pi Model B (embedded Linux)
\page b2qt-preparing-hardware-rasberrypi.html
\title Preparing Raspberry Pi
\previouspage b2qt-installation-guide.html
\nextpage b2qt-building-and-running.html
When using a \l{http://www.raspberrypi.org/}{Raspberry Pi} as a
development device, following steps are required to prepare it for
\B2Q.
Note that Ethernet networking is required to connect the device to Qt Creator.
This means that the support is currently limited to Raspberry Pi Model B which
includes an Ethernet port.
\note \b{It is important that the steps in this section are repeated
every time after updating the \SDK.}
The images containing \B2Q stack for Raspberry Pi is included in the SDK,
ready to be copied to a micro-SD card.
\section1 Preparing a Micro-SD Card
An SD card of at least 512MB capacity is sufficient.
\include detect-sd-card-device-name.qdocinc instructions
\section1 Installing the \B2Q Image
Write the image to the micro-SD card:
\code
cd <SDK_INSTALL_DIR>
sudo Boot2Qt-1.0/raspberrypi-eLinux/images/deploy.sh /dev/XXX
\endcode
After the image has been deployed, power up the device and confirm that it shows
a \B2Q welcome screen and/or demo.
\section1 Configuring a Device Kit in Qt Creator
\include b2qt-post-install-setup.qdocinc configuring network device
\b {You are now ready to start developing for your device!}
See \l{Building and Running an Example}
*/
/*!
\page b2qt-building-and-running.html
\title Building and Running an Example
\previouspage b2qt-installation-guide.html
\nextpage b2qt-customization.html
Once the installation and configuration steps for the SDK and the
target device(s) are completed, it's time to test the setup.
First, make sure your device is powered up and connected to the
development host via USB.
Then, follow these steps to create and run a simple \l{Qt Quick}
application on the device:
\list 1
\li Open \b{File > New File or Project}, select
\b{Qt Quick 2 Application (Built-in Types)} and click \b{Choose...}.
\li In \b{Kit Selection} dialog, select the kit(s) for your
devices. You can also select the emulator kit to test running the
project in the emulator.
\li Click \b{Next} and finish the wizard.
\li In \b{Projects > Build & Run}, select the correct kit for your
connected device.
\li To build and run the project, click \inlineimage qtcreator-run.png
\endlist
\section1 Setting Up an Already Existing Project for Deployment
The projects generated by Qt Creator will always have the correct settings
for deployment on the device or emulator. However, existing projects may
need some changes.
As a general rule, application binaries and resources (such as QML files and
images) are deployed under \c {/data/user/qt/<APPLICATION_NAME>} directory.
Therefore, the \c path variable for \c INSTALLS target(s) need to be adjusted
accordingly in .pro files:
For example, the following:
\code
target.path = ...
INSTALLS += target
\endcode
should be migrated to:
\code
target.path = /data/user/qt/<APPLICATION_NAME>
INSTALLS += target
\endcode
*/
/*!
\page b2qt-customization.html
\title Customization
\previouspage b2qt-building-and-running.html
\nextpage b2qt-supported-platforms.html
\section1 Environment and Input
By default, the basic environment variables and startup options of
\B2Q applications are set in the file \c
{/system/bin/appcontroller.conf} in embedded Android devices and
in \c{/etc/appcontroller.conf} in embedded Linux devices.
This file can be customized if targeting a hardware device that
has different input devices than what the \B2Q stack is configured
for by default.
Note that on some devices, the root file system (where this file
resides) is mounted read-only at boot time. It needs to be
remounted read-write to allow modification. The following command
does that:
\code
<SDK_INSTALL_DIR>/Tools/b2qt/adb remount
\endcode
In the \c{appcontroller.conf} file the input devices are
specified by the lines similar to these:
\code
env=QT_QPA_GENERIC_PLUGINS=evdevtouch:/dev/input/event0
\endcode
Usually there is no need to change this setting. USB input devices like
keyboards and mice are automatically recognized. The mouse pointer is shown
automatically if a mouse is connected.
Note however that hotplugging may not work, meaning that the input
devices, like keyboard and mouse, have to be connected at boot
time.
On some devices, for example the i.MX6 Sabre Lite, the touchscreen device is
specified explicitly in \c QT_QPA_GENERIC_PLUGINS. This is necessary because
the automatic device discovery would fail to find the touchscreen.
\section1 Booting to a Custom Application
After you have deployed your own application to the device it will be launched instead
of the \B2Q demo launcher on boot. To prevent this behavior you have to remove
this step from the build steps of your project's run configuration.
To remove your application from the default startup use the following command:
\code
<SDK_INSTALL_DIR>/Tools/b2qt/adb shell appcontroller --remove-default
\endcode
\section1 Switching Between Portrait and Landscape Views
Depending on a device screen dimensions and application requirements it might be desirable
to change the default view orientation. The following example shows how to rotate your
application in QML.
\code
import QtQuick 2.0
Item {
id: root
width: 800
height: 1280
// Container element for rotating
Rectangle {
id: main
// Swap the width and height of the root item
width: root.height
height: root.width
anchors.centerIn: parent
// Rotate 90 degrees clockwise around transformOrigin
rotation: 90
// The rotated content
Text {
text: qsTr("Hello World")
anchors.centerIn: parent
}
MouseArea {
anchors.fill: parent
onClicked: {
Qt.quit();
}
}
}
}
\endcode
*/
/*!
\page b2qt-supported-platforms.html
\title Supported Platforms
\previouspage b2qt-customization.html
\nextpage b2qt-troubleshooting.html
\section1 Supported Target Devices
\B2Q can be made to run on hardware that has support for
the Android operating system, version 4.0 or later.
Approximate minimal hardware requirements for running \B2Q are:
\list
\li 256Mb of RAM
\li 500Mhz CPU, 1Ghz preferred for 60 FPS velvet-smooth UI
\li OpenGL ES 2.0 support
\li Android 4.0+ compatible hardware
\endlist
The following devices have been used as reference and are tested to work:
\list
\li \l{http://www.google.com/nexus/7/specs/}{Google/Asus Nexus 7}
\li \l{http://beagleboard.org/hardware-xM}{BeagleBoard-xM}
\li \l{http://boundarydevices.com/products/sabre-lite-imx6-sbc/}{Freescale i.MX6 Sabre Lite board (Boundary Devices)}
\li \l{http://www.raspberrypi.org/faqs}{Raspberry Pi Model B}
\endlist
\section1 Supported Development Environment
The development environment supported by \B2Q is Ubuntu Linux 64-bit (12.04 LTS or 12.10).
\sa {Requirements for Development Host}
*/
/*!
\page b2qt-troubleshooting.html
\title Troubleshooting
\previouspage b2qt-supported-platforms.html
\note An updated version of this information may be available in the Digia customer portal.
See also \b{\l{http://qt.digia.com/en/Product/Boot-to-Qt/Boot-to-Qt-Known-Issues/}{Boot to Qt Known Issues}.}
\section1 General Issues
\section2 I have problems deploying/launching the application in Qt Creator
Check if the device is properly connected to the PC via USB.
See \l{Connectivity Issues}.
If using the emulator, see \l{Installing VirtualBox}{Configuring VirtualBox}.
\section2 I have problems deploying/launching a Qt or Qt Quick example application
Because of a technical peculiarity in \c{qmake}, it is not
possible to get correct deployment setup for any application that
is placed inside a Qt source code tree.
The workaround is to copy the example sources to a location
outside the Qt source tree, and open this copy of the example
application instead.
\section2 I have problems launching or running applications on hardware after updating the SDK
Remember to repeat the process of updating also your device with the latest
version of \B2Q. See \l{Installing Boot to Qt on Target Devices}.
\section2 Booting Sabre Lite i.MX 6 stops with \e {6x_bootscript not found} error
Check the U-Boot version number. It should start with either \c{2012} or \c{2013}.
If it is \c{2009.xx}, an upgrade of the bootloader is required. See information and
instructions here:
\list
\li \l http://boundarydevices.com/6q_bootscript/
\li \l http://boundarydevices.com/switching-u-boot-versions-on-i-mx6/
\endlist
\section2 How do I restore my Nexus 7 to factory settings?
Goto \l{https://developers.google.com/android/nexus/images} and
download the correct file for your device. Unpack it, and then
\code
<SDK_INSTALL_DIR>/Tools/b2qt/adb reboot bootloader
<SDK_INSTALL_DIR>/Tools/b2qt/fastboot -w update <image-file>.zip
\endcode
\section2 How do I shut down the Nexus 7?
If the \B2Q demo launcher is running, start the "Launcher
Settings" app, and press the "Power Off" button.
Otherwise, make sure the Nexus 7 is connected to your PC with USB, and run
the following command in a terminal:
\code
<SDK_INSTALL_DIR>/Tools/b2qt/adb shell reboot -p
\endcode
Alternatively, press and hold the power button for 10
seconds. This will force a reboot.
\section2 Trying to build for the emulator target fails with error message \e{make: i686-android-linux-g++: Command not found}
You need to install proper libraries in order to run 32-bit programs in 64-bit Linux operating system.
See \l{Installing 32-bit Support Libraries}.
\section2 Something crashed!
The following command shows the system log:
\code
<SDK_INSTALL_DIR>/Tools/b2qt/adb logcat
\endcode
\section2 Mouse or touch input does not work
See \l{Customization}.
Note that hotplugging does not currently work; any input device
must be present at boot time to be recognized.
\section2 Application stops with \e{EGLFS: OpenGL windows cannot be mixed with others.}
OpenGL and Qt Quick 2 applications can only have one
fullscreen window existing at a time. Trying to create another
OpenGL window, or trying to mix an OpenGL window with a raster one
will display the above message and abort the application.
\note For raster windows (software rendered content based on QWidget or
QPainter), there is no such limitation.
\section2 I cannot edit the contents of appcontroller.conf on the device
The file system where this file is located may be mounted as read-only.
See \l{Customization}.
\section1 Connectivity Issues
\section2 I cannot connect to my hardware device via USB
See \l{5. Setting up USB Access to Embedded Devices}.
\section2 adb fails with "error: more than one device and emulator"
You have to specify which android device you want \c{adb} to talk
to, using adb's \c{-s <serial-number>} option. Use the following
command to find to see the serial number of the connected
devices:
\code
<SDK_INSTALL_DIR>/Tools/b2qt/adb devices
\endcode
\section2 What is the user and password to access my embedded Linux device
Embedded Linux devices can be accessed using user \c{root} and an empty password.
*/
|