This article will describe building Yocto and running QEMU.
Table of Contents
1 System environment
This article uses virtual machine as below.
|CPU core number||1|
2 Install package for building Yocto
Install package according to Yocto QuickStart.
$ sudo apt-get install -y gawk wget git-core diffstat unzip texinfo gcc-multilib build-essential chrpath socat libsdl1.2-dev xterm
3 Download poky
Download poky which is build tools for Yocto.
$ git clone http://git.yoctoproject.org/git/poky
4 Run oe-init-build-env
Run oe-init-build-env which will set PATH to build tools and create build directory.
$ cd poky $ . oe-init-build-env
A conf/local.conf defines CPU architecture, build thread number and make -j option number. This article use default local.conf which defines qemux86 as CPU architecture.
$ emacs conf/local.conf
|BB_NUMBER_THREADS||Build thread number|
|PARALLEL_MAKE||make -j option number|
6 Build Yocto with core-image-minimal
A core-image-minimal is recipe for building minimal rootfs without X-window package.
$ bitbake core-image-minimal WARNING: Host distribution "Ubuntu-16.04" has not been validated with this version of the build system; you may possibly experience unexpected failures. It is recommended that you use a tested distribution.
It takes 3 hours to build core-image-minimal on this system environment.
A size of build directory is about 20GB. If you use core-image-sato for building rootfs with X-window application, a size of build directory will be about 30G.
7 Run QEMU
After running oe-init-build-env, runqemu command can be used.
$ runqemu qemux86
Changing console to serial or GDB connection can be used.
$ runqemu qemux86 nographic $ runqemu qemux86 qemuparams="-gdb tcp::10000 -S" # wait gdb's target remote