裸板基于9G45的DDR测试样例，可用户判断DDR的空间大小，读写数据完整性，硬件片选是否正确，多颗DDR芯片硬件组合是否正确，硬件线路是否完整，DDR线路时序是否正常。(DDR bare board test case based on 9G45, the user can determine the DDR size of the space, read and write data integrity, hardware selection is correct, a plurality