The full device tree is available to U-Boot proper, but normally only a subset
(or none at all) is available to TPL and SPL. See 'Pre-Relocation Support' and
-'SPL Support' in doc/driver-model/README.txt for more details.
+'SPL Support' in doc/driver-model/design.rst for more details.
Using several DTBs in the SPL (CONFIG_SPL_MULTI_DTB)