Building a customized Linux image using Yocto Project with Qt stack

Dear fellow coders,

i'm fairly new to Linux in general. Do you've a rough timeframe how long it'd take if i'm building a customized Linux image for my development board using Yocto Project, and then integrating Qt stack into my Linux image? My development board is not a reference board in Yocto Project.

Thanks!

How much time do you have for the project?

Hi Rinndalir, about 2 months' time?

Two months can be a long time or not enough time. Depends on what your skill level is. Do you have a kernel already built along with a device tree? Because if you're starting from scratch it will be more work.

I'm pretty new to Linux & qt in general. What I have is the SDK with the necessary toolchains and there's also a pre-compiled Linux kernel image; rootfs & Uboot, included in the SDK when unpacked. There's a menuconfig I can access in my SDK to configure the Linux options but a default option has been selected. So that said, probably I won't go by the Yocto Project route to build the Linux distribution but figure out how to link my current SDK + Qt together.

What I need guidance now is, based on my default linux configuration (as provided by SDK), how may I go about executing the steps to add Qt library into my rootfs, and then compile everything into images (i.e. kernel image, rootfs, Uboot) that has Qt lib in it, so that I can run Qt apps / demos on my embedded Linux once I flash in all the images?

You have everything, so now you just need to start work on it. Ask specific questions as you go.

I've existing Linux kernel setup on my embedded Linux.

So the next step is to compile / make qt-everywhere-opensource-4.8.6 using my vendor's compiler? and then install into my embedded Linux?

I managed to compile the embedded version of Qt-everywhere-opensource-4.8.6 for arms, in my host computer running Ubuntu.

As I'd just like to test out the Qt demos on my embedded Linux board, I ran Putty Terminal and access the demos and examples compiled in Qt-everywhere-opensource-4.8.6 via my NSF and met the following problems:

FYI, the Qt lib files are residing in the compiled Qt-everywhere-opensource-4.8.6 folder, sitting on my host Ubuntu folder. Will the Qt demos / examples have problems running when I execute them in my embedded Linux? Also, do I need to append my .profile file in my embedded Linux board to point to the PATH in my host computer Ubuntu for the necessary Qt lib files or i'd have to copy the Qt lib files physically into my Lib folder on my embedded Linux board?

Error 1:
When I tried to execute a Qt demo in my Putty terminal, it says:
/mnt/QtEmbedded-4.8.6-arm/examples/qws/framebuffer # ./framebuffer
Error: cannot open framebuffer device: Operation not permitted

Error 2:
when I tried to execute deform demo on putty terminal, it says:
/mnt/QtEmbedded-4.8.6-arm/demos/deform # ./deform Bus error

Error 3:
when I tried to execute books demo on putty terminal, it says:
./books: error while loading shared libraries: libQtSql.so.4: cannot open shared object file: No such file or directory