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AM1808 UBL下载错误，求解？

LOCKER LIANG
Prodigy 10 points


自己做的一块底板，核心板是用利尔达的，现在只焊接了复位电路和BOOT选择电路，通过UART2下载程序到NAND中时，显示如下信息？

出现

<AIS Parse>:Loaded 13992-Byte section to address 0x80000000.

<AIS Parse>:Processing command 1: 0x58535901.

<AIS Parse>:Performing Opcode Sync...

<Serial Port>:Read error! <The operation has timed out.>

<AIS Parse>:I/O Error in read!

以后就是最后两行重复出现。