meta-raspberrypi-tryboot

Minimal changes to use Raspberry Pi tryboot for A/B updates.

This repository allows implementing a boot flow similar to the one proposed by Raspberry Pi: https://www.raspberrypi.com/documentation/computers/config_txt.html#example-update-flow-for-ab-booting

It provides support for building a Raspberry Pi Yocto image with the following partition schema:

Device	Partition
/dev/sdx1	Tryboot
/dev/sdx2	BootA
/dev/sdx3	BootB
/dev/sdx4	Extended Partition
/dev/sdx5	RootA
/dev/sdx6	RootB
/dev/sdx7	Data

Branches

The repository contains multiple branches reflecting different stages of development:

• tryboot: Initial attempt to create the tryboot partition using subprocess calls.
• cmdline: First attempt to create two boot partitions with different cmdline settings.
• tryboot-2: Refactored into a wic plugin to generate the tryboot partition.
• tryboot-3: Further refactoring to modify the wic file (boot partitions) in workdir instead of deploydir, as RAUC bundles were otherwise unbuildable.
• tryboot-4: Additional refactoring to re-generate the WIC bmap file to ensure correct hashes. This is the most up-to-date version!