### Overview

RAUC and Barebox are both developed by Pengutronix and both are designed to provide a complete and homogeneous solution. RAUC relies on the bootchooser mechanism implemented in Barebox which provides a mean to work with abstract boot targets.

A target can be seen as set of variables and options that will be used by the bootchooser algorithm to choose which target to boot on. The way those variables are presented and accessed is defined in the Barebox state framework which stores them in persistent memory (EEPROM, NAND/NOR flash, SD/eMMC, etc.).

### Boot selection and A/B updates

This Device Tree defines a redundant A/B system upgrade scheme. As we just added our state backend storage we have to enable both bootchooser and state framework in our barebox configuration.

We also have to add the boot targets system0 and system1 in our default environment. The actual boot selection will be done by the bootchooser so we must set boot.default=bootchooser and targets="system0 system1".

### Integration notes

In this configuration each partition holds its own Linux kernel image and Device Tree. From the Linux kernel configuration point of view we only need to add support for the SquashFS filesystem by enabling the CONFIG_SQUASHFS=y option.