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AM2434: UART口通过uniflash烧录sbl_uart_uniflash 失败

Part Number: AM2434
Other Parts Discussed in Thread: UNIFLASH

设备情况: AM2434_ALX 自研板

问题: 用uniflash工具烧录失败

现象描述: 用串口工具通过uart0连接PC,下载sbl  第一阶段失败,每次固定4% 失败,下图是下载log(为了验证问题,图中只下载一个文件,仍然失败):

配置信息:

排除,打印串口UART0日志: (是否说明硬件已经正常启动)

请问: 如何排除?请帮忙提供排除的可能方向?谢谢!