Constructing an Embedded Linux Image for qemux86-64 using yocto project

 Hello All,

In this blog we are going to see how we can construct an embedded linux image for "qemux86-64" and verifying the booting using qemu(quick emulator) using yocto project

pre-requisite: 

you need to be familiar with my previous articles as it contains details of setup environment

link to my previous articles:

https://learnyoctowithme.blogspot.com/2022/03/constructing-embedded-linux-image-for.html

https://learnyoctowithme.blogspot.com/2022/03/constructing-embedded-linux-image-for_22.html

Building an embedded linux image for qemux86-64 using yocto project:

Step 1: Download the Poky Source code

$ git clone git://git.yoctoproject.org/poky
$ cd poky

step 2 : checkout to the branch dunfell
 
$ git checkout dunfell 

step 3: download the meta-openembedded source code from github

$ git clone https://github.com/openembedded/meta-openembedded
 
$ cd meta-openembedded 

$ git checkout dunfell

$ cd ..

step 4: Inside the poky folder ,source the oe-init-build-env script

$ source ./oe-init-build-env build_x86

NOTE : This will create a build environment inside the folder build_x86

step 5: Go to folder build_x86 and inside build_x86 folder you can observe conf directory with two files named as bblayers.conf and local.conf

 step 6 : Edit the local.conf file as below

    set the MACHINE variable as  MACHINE ?? = "qemux86-64"


and append the following line to local.conf file as INHERIT+="rm_work"


INHERIT+="rm_work" will saves the disk space while building the image

step 7: Now add the openembedded layers to bblayers.conf file as

Inside build_x86 folder , type the following commands:

$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-oe/
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-python/
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-networking/
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-multimedia/
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-filesystem/
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-perl/
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-webserver/
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-initramfs
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-gnome
$ bitbake-layers add-layer /home/shashank/poky/meta-openembedded/meta-xfce

 and the final bblayers.conf file should look as 



step 8: Now inside the build_x86 folder, run the command as

$ bitbake core-image-minimal 


NOTE: The build will take enough amount of time based on your system configuration.
                for me it took 2-3hrs to complete the build as I have 8 core 16 threads CPU

step 9: Now verify the booting of your image using the command

$ runqemu nographic


NOTE: default username will be root with empty password

That's it now we have constructed our embedded linux image for qemux86-64 and verified the booting using qemu.

 


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