可以基于本流程了解IOP Raid处理器在启动时对DDR2内存控制器的初始化。也可以以此了解其他片上系统的DDR2控制器的启动方法。-Understanding of this process can be based on IOP Raid processor at boot time on the DDR2 memory controller initialization. Can also be used to understand the other system-on-chip DDR