PBI commands can be used to configure SoC before it starts the execution.
Please refer doc/README.pblimage for more details
+ CONFIG_SPL_FSL_PBL
+ It adds a target to create boot binary having SPL binary in PBI format
+ concatenated with u-boot binary.
+
CONFIG_SYS_FSL_DDR_BE
Defines the DDR controller register space as Big Endian