You have to install the latest CW update and check Chapter 8.1 from ARMv8_Targeting_Manual.pdf available into \Freescale\CW4NET_v2017.03\CW_ARMv8\ARMv8\Help\PDF\
I refer to your documentation ARMv8_Targeting_Manual.pdf and use CWTAP debug SPL for LS1043ARDB. But when SPL run to board_init_f_init_reserve function,SPL exception exits.