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AM437x的uboot中关于ddr配置数据结构emif_regs中几个成员变量的含义是什么?如何确定其中的数值?



我在琢磨am437x的uboot中关于ddr的配置部分。参考了SPRAC70A_AM437x_EMIF_Configuration_Tool_V21.xlsx》,《sprac70a_AM43xx EMIF Tools (Rev. A) .pdf》,《AM437x DDR Configuration and Programming Guide》。但是还是没有搞懂数据结构static const struct emif_regs中的

.emif_rd_wr_exec_thresh  = 0x80000000,
 .emif_prio_class_serv_map = 0x80000001,
 .emif_connect_id_serv_1_map = 0x80000094,
 .emif_connect_id_serv_2_map = 0x00000000,
 .emif_cos_config  = 0x000FFFFF
成员变量具体是什么含义?也没有找到对应的寄存器?以及数值是如何确定的?