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AM2434: UART烧写Flash失败

Part Number: AM2434

问题:AM2434 UART下载中途失败。
环境: AM2434-alx自研板,存储媒介用的SD卡 MMCSD1口。 OSPI 接口未接 SPI flash。
bootmode [0:6] : 0111011 
下载串口: UART0, 同TTL转串口线连接PC USB.
错误现象:每次下载进度条4% 固定位置固定中断,必现。