The external is tested on Ubuntu 22.04 LTS. The following system build dependencies are required.
$ sudo apt-get install subversion build-essential bison flex gettext \
libncurses5-dev texinfo autoconf automake libtool mercurial git-core \
gperf gawk expat curl cvs libexpat-dev bzr unzip bc python-dev \
wget cpio rsync xxd
In some cases, buildroot will notify that additional host dependencies are required. It will let you know what those are.
Clone, configure, and build. When building, use the appropriate defconfig in
the buildroot-ynov-external/configs directory for your board.
Here, as an example, we use warp7_ynov_defconfig or stm32mp157a_dk1_ynov_defconfig.
$ git clone https://github.com/Ynov-Linux/buildroot-ynov-external.git
$ git clone https://git.busybox.net/buildroot
$ cd buildroot
$ make BR2_EXTERNAL=../buildroot-ynov-external/ warp7_ynov_defconfig
$ make
The resulting bootloader, kernel, and root filesystem will be put in the
'output/images' directory. There is also a complete sdcard.img.
A SD card image is generated in the file sdcard.img.
This image can be written directly to an eMMC/SD card.
$ cd output/images
$ sudo dd if=sdcard.img of=/dev/sdX bs=1M
Another method, which is cross platform, to write the SD card image is to use Etcher.