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处理器-SDK-AM335X:Uboot cannot start with latest sdk

Part Number: PROCESSOR-SDK-AM335X

I am trying to compile the uBoot board for custom use with the latest SDK, using AM335x_evm_defconfig. However, UART does not have any output at all. There should be no problem with the board hardware. U-boot2011 can be used to start normally. I'm a new embedder and don't know where it's not configured correctly.