is set. Source files can be compiled for TPL with options choosed in the
board config file.
+TPL use a small device tree (u-boot-tpl.dtb), containing only the nodes with
+the pre-relocation properties: 'u-boot,dm-pre-reloc' and 'u-boot,dm-tpl'
+(see README.SPL for details).
+
For example:
spl/Makefile: