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Building Bootable Linux Images |
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This application note explains how to build the bootable Linux images for the Emcraft STM32MP1 System-On-Module from the Yocto distribution. The following procedure was explicitly validated on a Fedora 27 Linux host.
Step through the following procedure:
- Download and unpack the OpenSTLinux release from the file
https://emcraft.com/misc/openstlinux-4.14-rocko-mp1-18-11-26-2.8.1.tar.bz2
- Download the Emcraft STM32MP1 add-on Yocto layer.
- Unpack the Emcraft STM32MP1 layer:
$ cd meta-st
$ tar xfj meta-emcraft-stm32mp1-2.8.0.tar.bz2
$ cd ..
$ ls -l
total 28
drwxrwxr-x 14 psl psl 4096 Jan 4 13:14 meta-openembedded
drwxrwxr-x 13 psl psl 4096 Jan 4 13:14 meta-qt5
drwxrwxr-x 6 psl psl 4096 Apr 8 16:52 meta-st
drwxrwxr-x 5 psl psl 4096 Jan 4 13:14 meta-timesys
drwxrwxr-x 8 psl psl 4096 Jan 4 13:14 openembedded-core
$ ls -l meta-st/
drwxrwxr-x 20 psl psl 4096 Jan 4 13:14 meta-emcraft
drwxrwxr-x 20 psl psl 4096 Jan 4 13:14 meta-st-openstlinux
drwxrwxr-x 17 psl psl 4096 Jan 4 13:14 meta-st-stm32mp
drwxrwxr-x 10 psl psl 4096 Jan 4 13:14 meta-st-stm32mp-addons
drwxrwxr-x 3 psl psl 4096 Apr 8 17:09 scriptt
- Setup the build directory:
$ DISTRO=openstlinux-weston MACHINE=stm32mp1-som \
source meta-st/scripts/envsetup.sh build-20190308
- Copy meta-emcraft/conf/site.conf.sample as conf/site.conf to your build directory:
$ cp ../meta-st/meta-emcraft/conf/site.conf.sample \
conf/site.conf
- Edit conf/site.conf and adjust the DL_DIR variable to an arbitrary directory on your host. This is where Yocto will download the packages for the build.
- Build the bootable U-Boot, Linux images and root filesystem:
$ bitbake emcraft-rootfs
- Ouput of the build will be in tmp-glibc/deploy/images/stm32mp1-som/:
- uImage - Linux kernel image;
- stm32mp1-som.dtb - Linux Device Tree Blob (.dtb) image;
- u-boot-stm32mp1-som-trusted.stm32 - U-Boot image;
- tf-a-stm32mp1-som-trusted.stm32 - ARM Trusted Firmware image
- emcraft-rootfs-openstlinux-weston-stm32mp1-som.tar.xz - Linux root filesystem image.
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