Want to set up Qt5 for developing application in Wandboard


  • Moderators

    Another possibility of those OpenGL libraries would be in the Ubuntu image that you have downloaded. Can you search for those in the Ubuntu that you have flashed on the board ?



  • Hi,

    I search at my end i got header file GLES2/gl2.h at multiple when i put command "file path/GLES2/gl2.h" then at every path it gives C source file in ASCII format.
    Also I got only one libGLESv2.so library which is Compatible to Intel.

    Can i search libGLESv2.so file for ARM on Internet & download it & copy to my toolchain?

    is it OK?


  • Moderators

    bq. Can i search libGLESv2.so file for ARM on Internet & download it & copy to my toolchain?

    Not sure if that would work.

    But did you search if it is in the Ubuntu OS that you flashed on the board ?
    It surely must be there.
    And if it's there you will need to compile Qt in that environment so that it picks up the ARM compatible OpenGL libraries.



  • Yes, the library libGLESv2.so is avilable at the location /usr/lib/i386-linux-gnu/mesa-egl & it is with Ubuntu OS. So how can I generate ARM compatible library with this.

    Can you provide steps?


  • Moderators

    Lets clarify few things

    1. Where are you compiling Qt ? on the WandBoard or on your development machine ?
    2. Where is this above library on the WandBoard or your machine ?


  • Hi,

    1. Right now I am compiling code in Qt which is installed on my desktop PC. i haven't port Qt on wandboard.
    2. The above path which i mentioned is on system directory. thats means its in my PC rootfs.

  • Moderators

    Ok.
    Do you have the Ubuntu OS for WandBoard image? If not you can create it from the OS that is flashed on your board using dd command. Then mount that image on your Host PC so that you can compile Qt in that ARM compatible Ubuntu OS environment.

    Can you see "this":http://www.ics.com/blog/building-qt-5-raspberry-pi#.U9tTk3Ka60k ? It explains nicely how to compile Qt5 for Raspberry Pi. I think it will be a similar process with just toolchain and compiling environment changes. Anyway it explains nicely about the cross compiling so that you get understanding what cross compiling is.

    Edited



  • Let me tell you, how i reached to this stage of developement, so that you can notice what part is done & what is left.

    I have followed Robert Nelson Method to set up SD card to boot Wandboard. I have successfully boot the Wandboard which will create command prompt & arm login on Wandboard. Also i have tested a simple "Hello Word" program written in vi editor & cross compile from Linaro Toolchain (gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux) on wandboard.

    Also I have download "qt-opensource-linux-x86-5.3.1.run" file & run it using terminal commands.

    Then i generate new project in Qtcreater of Qt5.3.1 & then compile it for local platform. Its compile successfuly gives o/p file for host machine (My desktop PC).
    Now I want to do the same (that is cross compiling) for target board (Wandboard). For that I want to set up compilers, Kits, debuggers, Devices & Qt versions ( from the path Tools > Options > Build & Run) which will generate o/p file for Wandboard.

    Now tell me what to do next.


  • Moderators

    bq. Also i have tested a simple “Hello Word” program written in vi editor & cross compile from Linaro Toolchain (gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux) on wandboard.

    The hello world program you have compiled requires just an arm gcc compiler which is provided by the toolchain and nothing other external.

    bq. For that I want to set up compilers, Kits, debuggers, Devices & Qt versions ( from the path Tools > Options > Build & Run) which will generate o/p file for Wandboard.

    For this you need to compile Qt5 for Wandboard first but for that you need ARM compatible OpenGL ES libraries which are not on your host machine but are on your target machine.

    For that you have to mount the ARM compatible Ubuntu OS's image on your host system so that you get the complete environment and compilation can carry on.

    After compilation succeeds you can add this Qt5 build as a kit to the Qt creator also compiler to be set as the arm linaro gcc so that when you compile applications it compiles for the arm.

    Now you first need to find way to mount that WandBoard Ubuntu OS's image on your host system.
    Refer to the ICS link that i posted earlier where you can see how to create an image and how to mount it.



  • Hi,

    I have ported the Ubuntu image for wandboard in to the SD card using Win32imagewriter.
    I have observed the file type of "libGLESv2.so.2.0.0" & it gives ARM compatible.
    I have copied both "gl2.h" & "libGLESv2.so.2.0.0" file at my pc Desktop. Now tell me what to do next to configure the file?

    Can i replace these files with the Intel compatible files located at toolchain?


  • Moderators

    bq. I have ported the Ubuntu image for wandboard in to the SD card using Win32imagewriter.

    Did you flashed it back on to SD card ? You must not.
    You have to create image file from OS on the SD card.
    So do you have the image file ?



  • Actually I have downloaded ubuntu image file from "http://www.wandboard.org/index.php/downloads".
    Then i format my SD card & port that image file into SD card using card reader & "Win32DiskImager-0.9.5-install" tool.
    Then I read the SD card using card reader & search the files “gl2.h” & “libGLESv2.so.2.0.0” in the sd card.

    I got these files in SD card, then I copied that files to my desktop.


  • Moderators

    bq. Then i format my SD card & port that image file into SD card using card reader & “Win32DiskImager-0.9.5-install” tool.

    Good that you flashed it. But we need the image file which you have downloaded from the said site.

    Ok, Now you need to mount that image on your host system.
    For that go to the ICS link that i posted earlier as refer from,

    bq. You will need the offset for the Linux image to mount it. If it's not otherwise provided with the download, you can determine it using losetup. There are 512 bytes per sector, so in the example below the offset is 122880 * 512 = 62914560.
    $ sudo /sbin/losetup /dev/loop0 raspberry-working-image.img
    $ sudo /sbin/fdisk -l /dev/loop0
    ...
    Device Boot Start End Blocks Id System
    /dev/loop0p1 8192 122879 57344 c W95 FAT32
    /dev/loop0p2 122880 3788799 1832960 83 Linux
    ...
    $ sudo /sbin/losetup -d /dev/loop0
    Now create a mount point and mount the image:
    $ sudo mkdir /mnt/raspberry-rootfs
    $ sudo mount -o loop,offset=62914560
    raspberry-working-image.img /mnt/raspberry-rootfs
    $ ls /mnt/raspberry-rootfs
    bin dev home lost+found mnt proc run selinux sys usr
    boot etc lib media opt root sbin srv tmp var

    Follow above as per your requirements.

    bq. I got these files in SD card, then I copied that files to my desktop.

    No use of copying those files on your host system as it will possibly require the whole environment which you are going to create now by mounting the image file as explained in above steps.



  • Hi,

    As per the previous discussion, i haved tried that command sequence but I am getting stuck at below command.
    *sudo mount -o loop,offset=62914560 \

    Wandboard-Ubuntu-image.img /mnt/wandboard-rootfs/*

    It gives error as mount: you must specify the filesystem type.

    After searching on net i pass filesystem type in command as
    *sudo mount -o loop,offset=62914560 \

    Wandboard-Ubuntu-image.img /mnt/wandboard-rootfs/ -t ext3*
    then the response is
    mount: wrong fs type, bad option, bad superblock on /dev/loop0,
    missing codepage or helper program, or other error
    In some cases useful info is found in syslog - try
    dmesg | tail or so

    After this I tried the command dmeg | tail but the response is not understanding.

    Can you plz help me to resolve this?


  • Moderators

    Can you show what type is it ?
    file Wandboard-Ubuntu-image.img



  • It is a x86 boot sector


  • Moderators

    Sorry to mention but i too don't know. Try searching the internet for how to mount that image.



  • Hi,

    We have decided to move on Yocto instead of Ubuntu.
    So I am now staring on Yocto. while building Qt using yocto on wandboard I require your help.

    Hope you will support me at that time.

    Thanks for your outstanding support till now.


  • Moderators

    That's fine.
    Any replies from their forums ?
    Seems Yocto has good documentation on Qt5.



  • What ever they shared with me regarding the query is related to yocto Only.
    With there reply it seems like we also have to move to yocto if we want to finish it with in a time span.


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