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UBL U-boot无法运行



自己做了一套板,是按TI原版的DM368 DVR电路图做的,板子完成后可以烧写UBL和U-boot,但是烧进去之后终端没有反应,用JTAG测试的DDR UART Flash 都可以正常读写,没有问题,现在不知道问题出在哪,无法下手,向各位高手求助!