The lowest level Yocto layer for the programmable load system image.

This provides stuff like device trees, hardware definitions, and bootloaders, as well as machine definitions.

Other layers required to build the programmable load are:

• meta-openembedded: specifically, meta-oe and meta-filesystems
• meta-openamp
• meta-rauc
• meta-clang: Optional, to compile everything with clang. This is the only compiler that's tested with these.

First, select the distro sativa in your build configuration; then configure your build/conf/local.conf to use one of the following machines:

• stm32mp157a-dk1: STM32MP1 development board
• load-rev3: Form factor hardware, rev3 pcb

Additionally, you may wish to enable additional image features for debugging:

EXTRA_IMAGE_FEATURES = "debug-tweaks tools-debug"

Note that the flag to enable a read-only rootfs (read-only-rootfs) is not specified, as this causes some configuration (namely Dropbear) to get overridden such that the host key is not stored on the overlay in /etc, and instead a ramdisk.

Typically, you will build the programmable-load-core image flavor.