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C6678 IBL没运行起来

我编译出了i2crom_0x51_c6678_le和i2cparam_0x51_c6678_le_0x500.out,并按照IBL_Build_Burn.doc文档将IBL写入到EEPROM的0x51地址,eepromwriter_input.txt 的内容如下:

file_name = i2crom_0x51_c6678_le.bin
bus_addr = 0x51
start_addr = 0
swap_data = 0

使用创龙6678开发板,使用飞线结合拨码配置成IBL NAND/Nor启动模式,上电,串口并没有打印IBL版本号、启动模式等信息。连接仿真器,查看寄存器0x2620020的值为0x21,与实际配置的BOOTMODE值不一致,请问这个问题是什么原因?怎么解决?