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FAQs (Diva)

2,475 bytes removed, 10:21, 21 April 2016
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=== Q: How can I reduce the clock frequency and RAM amount to evaluate the performances of the low-end versions of the Diva SoM? ===
'''A''': please refer to the following page on the '''DAVE Embedded Systems''' Developer's Wiki: [[Software_Manual_(Diva)#Diva_Frequency_Scaling DIVA_Frequency_Scaling | Frequency scaling]] and [[Software_Manual_(Diva)#Forcing_the_kernel_to_use_a_limited_amount_of_RAM | Forcing the kernel to use a limited amount of RAM]]
=== Q: How can I work with the XYZ peripheral/interface? ===
=== Q: I need the QT libraries for my application. Does the DIVELK contains the QT libraries? Are there demos and examples (with included source code)? ===
'''A''': the root file system provided with the DIVELK (/home/dvdk/delkdivelk/rfs/tisdk on the DVDK virtual machine) contains a pre-built version (4.8.0) of the QT libraries:
<pre>
dvdk@dvdk-vm:~/delkdivelk/rfs/tisdk/usr/lib$ ll libQ*lrwxrwxrwx 1 root root 23 Dec 17 2012 libQt3SupportE.so.4 -> libQt3SupportE.so.4.8.0*lrwxrwxrwx 1 root root 23 Dec 17 2012 libQt3SupportE.so.4.8 -> libQt3SupportE.so.4.8.0*-rwxr-xr-x 1 root root 2559288 Dec 16 2012 libQt3SupportE.so.4.8.0*lrwxrwxrwx 1 root root 22 Dec 17 2012 libQtCLuceneE.so.4 -> libQtCLuceneE.so.4.8.0*lrwxrwxrwx 1 root root 22 Dec 17 2012 libQtCLuceneE.so.4.8 -> libQtCLuceneE.so.4.8.0*-rwxr-xr-x 1 root root 1004872 Dec 16 2012 libQtCLuceneE.so.4.8.0*
lrwxrwxrwx 1 root root 19 Dec 17 2012 libQtCoreE.so.4 -> libQtCoreE.so.4.8.0*
lrwxrwxrwx 1 root root 19 Dec 17 2012 libQtCoreE.so.4.8 -> libQtCoreE.so.4.8.0*
lrwxrwxrwx 1 root root 19 Dec 17 2012 libQtHelpE.so.4.8 -> libQtHelpE.so.4.8.0*
-rwxr-xr-x 1 root root 523292 Dec 16 2012 libQtHelpE.so.4.8.0*
lrwxrwxrwx 1 root root 25 Dec 17 2012 libQtMultimediaE.so.4 -> libQtMultimediaE.so.4.8.0*lrwxrwxrwx 1 root root 25 Dec 17 2012 libQtMultimediaE.so.4.8 -> libQtMultimediaE.so.4.8.0*-rwxr-xr-x 1 root root 165312 Dec 16 2012 libQtMultimediaE.so.4.8.0*lrwxrwxrwx 1 root root 22 Dec 17 2012 libQtNetworkE.so.4 -> libQtNetworkE.so.4.8.0*lrwxrwxrwx 1 root root 22 Dec 17 2012 libQtNetworkE.so.4.8 -> libQtNetworkE.so.4.8.0*-rwxr-xr-x 1 root root 1273012 Dec 16 2012 libQtNetworkE.so.4.8.0*lrwxrwxrwx 1 root root 21 Dec 17 2012 libQtOpenGLE.so.4 -> libQtOpenGLE.so.4.8.0*lrwxrwxrwx 1 root root 21 Dec 17 2012 libQtOpenGLE.so.4.8 -> libQtOpenGLE.so.4.8.0*-rwxr-xr-x 1 root root 545724 Dec 16 2012 libQtOpenGLE.so.4.8.0*lrwxrwxrwx 1 root root 21 Dec 17 2012 libQtScriptE.so.4 -> libQtScriptE.so.4.8.0*lrwxrwxrwx 1 root root 21 Dec 17 2012 libQtScriptE.so.4.8 -> libQtScriptE.so.4.8.0*-rwxr-xr-x 1 root root 2655900 Dec 16 2012 libQtScriptE.so.4.8.0*lrwxrwxrwx 1 root root 26 Dec 17 2012 libQtScriptToolsE.so.4 -> libQtScriptToolsE.so.4.8.0*lrwxrwxrwx 1 root root 26 Dec 17 2012 libQtScriptToolsE.so.4.8 -> libQtScriptToolsE.so.4.8.0*-rwxr-xr-x 1 root root 796244 Dec 16 2012 libQtScriptToolsE.so.4.8.0*lrwxrwxrwx 1 root root 18 Dec 17 2012 libQtSqlE.so.4 -> libQtSqlE.so.4.8.0*lrwxrwxrwx 1 root root 18 Dec 17 2012 libQtSqlE.so.4.8 -> libQtSqlE.so.4.8.0*-rwxr-xr-x 1 root root 229816 Dec 16 2012 libQtSqlE.so.4.8.0*lrwxrwxrwx 1 root root 18 Dec 17 2012 libQtSvgE.so.4 -> libQtSvgE.so.4.8.0*lrwxrwxrwx 1 root root 18 Dec 17 2012 libQtSvgE.so.4.8 -> libQtSvgE.so.4.8.0*-rwxr-xr-x 1 root root 336720 Dec 16 2012 libQtSvgE.so.4.8.0*lrwxrwxrwx 1 root root 19 Dec 17 2012 libQtTestE.so.4 -> libQtTestE.so.4.8.0*lrwxrwxrwx 1 root root 19 Dec 17 2012 libQtTestE.so.4.8 -> libQtTestE.so.4.8.0*-rwxr-xr-x 1 root root 145500 Dec 16 2012 libQtTestE.so.4.8.0*lrwxrwxrwx 1 root root 21 Dec 17 2012 libQtWebKitE.so.4 -> libQtWebKitE.so.4.9.0*lrwxrwxrwx 1 root root 21 Dec 17 2012 libQtWebKitE.so.4.9 -> libQtWebKitE.so.4.9.0*-rwxr-xr-x 1 root root 27438036 Dec 16 2012 libQtWebKitE.so.4.9.0*lrwxrwxrwx 1 root root 18 Dec 17 2012 libQtXmlE.so.4 -> libQtXmlE.so.4.8.0*lrwxrwxrwx 1 root root 18 Dec 17 2012 libQtXmlE.so.4.8 -> libQtXmlE.so.4.8.0*-rwxr-xr-x 1 root root 261812 Dec 16 2012 libQtXmlE.so.4.8.0*lrwxrwxrwx 1 root root 26 Dec 17 2012 libQtXmlPatternsE.so.4 -> libQtXmlPatternsE.so.4.8.0*lrwxrwxrwx 1 root root 26 Dec 17 2012 libQtXmlPatternsE.so.4.8 -> libQtXmlPatternsE.so.4.8.0*-rwxr-xr-x 1 root root 4928424 Dec 16 2012 libQtXmlPatternsE.so.4.8.0*dvdk@dvdk-vm:~/delkdivelk/rfs/tisdk/usr/lib
</pre>
The root file system also provides a lot of pre-built demos and examples (with the related source code and project files), contained in the following directories:
* /home/dvdk/delkdivelk/rfs/tisdk/usr/bin/qtopia/demos* /home/dvdk/delkdivelk/rfs/tisdk/usr/bin/qtopia/examples
The Matrix-Gui application (http://processors.wiki.ti.com/index.php/Matrix_Users_Guide) that launched automatically after DIVELK startup is based on QT and can directly show some demos (simply touching the QT icon). Moreover, additional examples can be launched, for example the "calculator" QML demo: <pre>/etc/init.d/matrix-gui-2.0 stopcd /usr/bin/qtopia/demos/declarative/calculator./calculator -qws</pre> For additional information, please refer to the following pages: * http://processors.wiki.ti.com/index.php/Category:Qt * http://processors.wiki.ti.com/index.php/Qt_Tips* http://processors.wiki.ti.com/index.php/Using_Qt_4.7* http://processors.wiki.ti.com/index.php/Building_Qt* http://qt-project.org/doc/qt-5/gettingstarted.html === Q: How can I configure the Diva system to boot from network? ===
'''A''': Booting from network is very helpful during the software development (both for kernel and applications). The kernel image is downloaded via TFTP while the root file system is remotely mounted via NFS from the host. It is assumed that the development host:
* is connected with the target host board through an Ethernet LAN
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