firmware.yml expects firmware paths to be relative to the current working directory.

It could also allow paths relative to the firmware.yml file itself, e.g:

tiboot3:
    path: {firmware_file_dir}/tiboot3.bin
tispl:
    path: {firmware_file_dir}/tispl.bin
u-boot:
    path: {firmware_file_dir}/u-boot.img

The paths could be resolved with: .format(firmware_file_dir=recovery_config["firmware_file_dir"]) .

This can be used e.g when firmwares are distributed with the relevant yml file.